1 Version 1.45.0 (2020-07-16)
2 ==========================
6 - [Out of range float to int conversions using `as` has been defined as a saturating
7 conversion.][71269] This was previously undefined behaviour, but you can use the
8 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
9 may be desirable in rare performance sensitive situations.
10 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
12 - [Function like procedural macros can now be used in expression, pattern, and statement
13 positions.][68717] This means you can now use a function-like procedural macro
14 anywhere you can use a declarative (`macro_rules!`) macro.
18 - [You can now override individual target features through the `target-feature`
19 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
20 equivalent to `-C target-feature=+avx2,+fma`.
21 - [Added the `force-unwind-tables` flag.][69984] This option allows
22 rustc to always generate unwind tables regardless of panic strategy.
23 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
24 to include LLVM bitcode into generated `rlib`s (this is on by default).
25 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
26 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
27 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
29 \* Refer to Rust's [platform support page][forge-platform-support] for more
30 information on Rust's tiered platform support.
35 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
37 - [`proc_macro::TokenStream` now implements `Default`.][72234]
38 - [You can now use `char` with
39 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
40 a range of codepoints.][72413] E.g.
41 you can now write the following;
47 // Prints "abcdefghijklmnopqrstuvwxyz"
49 - [`OsString` now implements `FromStr`.][71662]
50 - [The `saturating_neg` method as been added to all signed integer primitive
51 types, and the `saturating_abs` method has been added for all integer
52 primitive types.][71886]
53 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
54 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
56 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
57 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
58 integer types.][69813]
59 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
60 integer types.][72324]
61 - [The `fetch_update` method has been added to all atomic integer types.][71843]
66 - [`BTreeMap::remove_entry`]
68 - [`rc::Weak::as_ptr`]
69 - [`rc::Weak::from_raw`]
70 - [`rc::Weak::into_raw`]
71 - [`str::strip_prefix`]
72 - [`str::strip_suffix`]
73 - [`sync::Weak::as_ptr`]
74 - [`sync::Weak::from_raw`]
75 - [`sync::Weak::into_raw`]
76 - [`char::UNICODE_VERSION`]
77 - [`Span::resolved_at`]
78 - [`Span::located_at`]
79 - [`Span::mixed_site`]
80 - [`unix::process::CommandExt::arg0`]
87 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
88 `~~outdated information~~` becomes "~~outdated information~~".
89 - [Added an emoji to Rustdoc's deprecated API message.][72014]
93 - [Trying to self initialize a static value (that is creating a value using
94 itself) is unsound and now causes a compile error.][71140]
95 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
96 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
97 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
98 previously undocumented and not intended for public use. Rustdoc still provides
99 a non-zero exit code on errors.
103 - [Make clippy a git subtree instead of a git submodule][70655]
104 - [Unify the undo log of all snapshot types][69464]
106 [73420]: https://github.com/rust-lang/rust/issues/73420/
107 [72324]: https://github.com/rust-lang/rust/pull/72324/
108 [71843]: https://github.com/rust-lang/rust/pull/71843/
109 [71886]: https://github.com/rust-lang/rust/pull/71886/
110 [72234]: https://github.com/rust-lang/rust/pull/72234/
111 [72239]: https://github.com/rust-lang/rust/pull/72239/
112 [72397]: https://github.com/rust-lang/rust/pull/72397/
113 [72413]: https://github.com/rust-lang/rust/pull/72413/
114 [72014]: https://github.com/rust-lang/rust/pull/72014/
115 [72062]: https://github.com/rust-lang/rust/pull/72062/
116 [72094]: https://github.com/rust-lang/rust/pull/72094/
117 [72133]: https://github.com/rust-lang/rust/pull/72133/
118 [71900]: https://github.com/rust-lang/rust/pull/71900/
119 [71928]: https://github.com/rust-lang/rust/pull/71928/
120 [71662]: https://github.com/rust-lang/rust/pull/71662/
121 [71716]: https://github.com/rust-lang/rust/pull/71716/
122 [71447]: https://github.com/rust-lang/rust/pull/71447/
123 [71269]: https://github.com/rust-lang/rust/pull/71269/
124 [71095]: https://github.com/rust-lang/rust/pull/71095/
125 [71140]: https://github.com/rust-lang/rust/pull/71140/
126 [70655]: https://github.com/rust-lang/rust/pull/70655/
127 [70705]: https://github.com/rust-lang/rust/pull/70705/
128 [69984]: https://github.com/rust-lang/rust/pull/69984/
129 [69813]: https://github.com/rust-lang/rust/pull/69813/
130 [69464]: https://github.com/rust-lang/rust/pull/69464/
131 [68717]: https://github.com/rust-lang/rust/pull/68717/
132 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
133 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
134 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
135 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
136 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
137 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
138 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
139 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
140 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
141 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
142 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
143 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
144 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
145 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
146 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
147 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
150 Version 1.44.1 (2020-06-18)
151 ===========================
153 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
154 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
155 * [Fix crashes when finding backtrace on macOS.][71397]
156 * [Clippy applies lint levels into different files.][clippy/5356]
158 [71397]: https://github.com/rust-lang/rust/issues/71397
159 [73078]: https://github.com/rust-lang/rust/issues/73078
160 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
161 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
164 Version 1.44.0 (2020-06-04)
165 ==========================
169 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
170 - [Added the `unused_braces` lint.][70081]
172 **Syntax-only changes**
174 - [Expansion-driven outline module parsing][69838]
179 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
184 These are still rejected semantically, so you will likely receive an error but
185 these changes can be seen and parsed by macros and conditional compilation.
189 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
190 Additionally when in incremental mode rustc defaults to 256 codegen units.
191 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
192 a panic is thrown.][67502]
193 - [Added tier 3\* support for the `aarch64-unknown-none` and
194 `aarch64-unknown-none-softfloat` targets.][68334]
195 - [Added tier 3 support for `arm64-apple-tvos` and
196 `x86_64-apple-tvos` targets.][68191]
201 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
202 `vec![]` to be able to be used in `const` contexts.
203 - [`convert::Infallible` now implements `Hash`.][70281]
204 - [`OsString` now implements `DerefMut` and `IndexMut` returning
205 a `&mut OsStr`.][70048]
206 - [Unicode 13 is now supported.][69929]
207 - [`String` now implements `From<&mut str>`.][69661]
208 - [`IoSlice` now implements `Copy`.][69403]
209 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
210 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
211 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
212 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
213 integer types.][69373]
217 - [`PathBuf::with_capacity`]
218 - [`PathBuf::capacity`]
220 - [`PathBuf::reserve`]
221 - [`PathBuf::reserve_exact`]
222 - [`PathBuf::shrink_to_fit`]
223 - [`f32::to_int_unchecked`]
224 - [`f64::to_int_unchecked`]
225 - [`Layout::align_to`]
226 - [`Layout::pad_to_align`]
232 - [Added the `cargo tree` command which will print a tree graph of
233 your dependencies.][cargo/8062] E.g.
235 mdbook v0.3.2 (/Users/src/rust/mdbook)
237 │ ├── html5ever v0.24.0
239 │ │ │ └── cfg-if v0.1.9
241 │ │ └── markup5ever v0.9.0
242 │ │ ├── log v0.4.8 (*)
244 │ │ │ └── phf_shared v0.7.24
245 │ │ │ ├── siphasher v0.2.3
246 │ │ │ └── unicase v1.4.2
247 │ │ │ [build-dependencies]
248 │ │ │ └── version_check v0.1.5
251 You can also display dependencies on multiple versions of the same crate with
252 `cargo tree -d` (short for `cargo tree --duplicates`).
256 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
257 the version in the sidebar.][69494]
261 - [Rustc now correctly generates static libraries on Windows GNU targets with
262 the `.a` extension, rather than the previous `.lib`.][70937]
263 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
264 - [The `file_name` property in JSON output of macro errors now points the actual
265 source file rather than the previous format of `<NAME macros>`.][70969]
266 **Note:** this may not point to a file that actually exists on the user's system.
267 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
268 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
269 not allow zero initialization such as `NonZeroU8`.][66059] This was
270 previously a warning.
271 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
272 operator has been defined as a saturating operation.][71269] This was previously
273 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
274 continue using the current behaviour, which may be desirable in rare performance
275 sensitive situations.
279 These changes provide no direct user facing benefits, but represent significant
280 improvements to the internals and overall performance of rustc and
283 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
284 - [Replace big JS dict with JSON parsing.][71250]
286 [69373]: https://github.com/rust-lang/rust/pull/69373/
287 [66059]: https://github.com/rust-lang/rust/pull/66059/
288 [68191]: https://github.com/rust-lang/rust/pull/68191/
289 [68899]: https://github.com/rust-lang/rust/pull/68899/
290 [71147]: https://github.com/rust-lang/rust/pull/71147/
291 [71250]: https://github.com/rust-lang/rust/pull/71250/
292 [70937]: https://github.com/rust-lang/rust/pull/70937/
293 [70969]: https://github.com/rust-lang/rust/pull/70969/
294 [70632]: https://github.com/rust-lang/rust/pull/70632/
295 [70281]: https://github.com/rust-lang/rust/pull/70281/
296 [70345]: https://github.com/rust-lang/rust/pull/70345/
297 [70048]: https://github.com/rust-lang/rust/pull/70048/
298 [70081]: https://github.com/rust-lang/rust/pull/70081/
299 [70156]: https://github.com/rust-lang/rust/pull/70156/
300 [71269]: https://github.com/rust-lang/rust/pull/71269/
301 [69838]: https://github.com/rust-lang/rust/pull/69838/
302 [69929]: https://github.com/rust-lang/rust/pull/69929/
303 [69661]: https://github.com/rust-lang/rust/pull/69661/
304 [69778]: https://github.com/rust-lang/rust/pull/69778/
305 [69494]: https://github.com/rust-lang/rust/pull/69494/
306 [69403]: https://github.com/rust-lang/rust/pull/69403/
307 [69033]: https://github.com/rust-lang/rust/pull/69033/
308 [68692]: https://github.com/rust-lang/rust/pull/68692/
309 [68334]: https://github.com/rust-lang/rust/pull/68334/
310 [67502]: https://github.com/rust-lang/rust/pull/67502/
311 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
312 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
313 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
314 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
315 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
316 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
317 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
318 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
319 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
320 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
321 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
322 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
323 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
326 Version 1.43.1 (2020-05-07)
327 ===========================
329 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
330 * [Fixed the stabilization of AVX-512 features.][71473]
331 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
333 [71430]: https://github.com/rust-lang/rust/pull/71430
334 [71473]: https://github.com/rust-lang/rust/issues/71473
335 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
338 Version 1.43.0 (2020-04-23)
339 ==========================
343 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
344 the type inferred correctly.][68129]
345 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
347 **Syntax only changes**
348 - [Allow `type Foo: Ord` syntactically.][69361]
349 - [Fuse associated and extern items up to defaultness.][69194]
350 - [Syntactically allow `self` in all `fn` contexts.][68764]
351 - [Merge `fn` syntax + cleanup item parsing.][68728]
352 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
353 For example, you may now write:
355 macro_rules! mac_trait {
365 These are still rejected *semantically*, so you will likely receive an error but
366 these changes can be seen and parsed by macros and
367 conditional compilation.
372 - [You can now pass multiple lint flags to rustc to override the previous
373 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
374 everything in the `unused` lint group except `unused-variables` which
375 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
376 everything in the `unused` lint group **including** `unused-variables` since
377 the allow flag is specified before the deny flag (and therefore overridden).
378 - [rustc will now prefer your system MinGW libraries over its bundled libraries
379 if they are available on `windows-gnu`.][67429]
380 - [rustc now buffers errors/warnings printed in JSON.][69227]
384 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
385 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
386 respectively.][69538] **Note** These conversions are only available when `N`
388 - [You can now use associated constants on floats and integers directly, rather
389 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
390 `f32::NAN` with no imports.
391 - [`u8::is_ascii` is now `const`.][68984]
392 - [`String` now implements `AsMut<str>`.][68742]
393 - [Added the `primitive` module to `std` and `core`.][67637] This module
394 reexports Rust's primitive types. This is mainly useful in macros
395 where you want avoid these types being shadowed.
396 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
397 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
401 - [`Once::is_completed`]
406 - [`iter::once_with`]
410 - [You can now set config `[profile]`s in your `.cargo/config`, or through
411 your environment.][cargo/7823]
412 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
413 executable path when running integration tests or benchmarks.][cargo/7697]
414 `<name>` is the name of your binary as-is e.g. If you wanted the executable
415 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
419 - [Certain checks in the `const_err` lint were deemed unrelated to const
420 evaluation][69185], and have been moved to the `unconditional_panic` and
421 `arithmetic_overflow` lints.
426 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
427 has been a warning since 1.36.0.
428 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
429 led to some instances being accepted, and now correctly emits a hard error.
431 [69340]: https://github.com/rust-lang/rust/pull/69340
435 These changes provide no direct user facing benefits, but represent significant
436 improvements to the internals and overall performance of `rustc` and
439 - [All components are now built with `opt-level=3` instead of `2`.][67878]
440 - [Improved how rustc generates drop code.][67332]
441 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
442 - [traits: preallocate 2 Vecs of known initial size][69022]
443 - [Avoid exponential behaviour when relating types][68772]
444 - [Skip `Drop` terminators for enum variants without drop glue][68943]
445 - [Improve performance of coherence checks][68966]
446 - [Deduplicate types in the generator witness][68672]
447 - [Invert control in struct_lint_level.][68725]
449 [67332]: https://github.com/rust-lang/rust/pull/67332/
450 [67429]: https://github.com/rust-lang/rust/pull/67429/
451 [67637]: https://github.com/rust-lang/rust/pull/67637/
452 [67642]: https://github.com/rust-lang/rust/pull/67642/
453 [67878]: https://github.com/rust-lang/rust/pull/67878/
454 [67885]: https://github.com/rust-lang/rust/pull/67885/
455 [68129]: https://github.com/rust-lang/rust/pull/68129/
456 [68672]: https://github.com/rust-lang/rust/pull/68672/
457 [68725]: https://github.com/rust-lang/rust/pull/68725/
458 [68728]: https://github.com/rust-lang/rust/pull/68728/
459 [68738]: https://github.com/rust-lang/rust/pull/68738/
460 [68742]: https://github.com/rust-lang/rust/pull/68742/
461 [68764]: https://github.com/rust-lang/rust/pull/68764/
462 [68772]: https://github.com/rust-lang/rust/pull/68772/
463 [68943]: https://github.com/rust-lang/rust/pull/68943/
464 [68952]: https://github.com/rust-lang/rust/pull/68952/
465 [68966]: https://github.com/rust-lang/rust/pull/68966/
466 [68984]: https://github.com/rust-lang/rust/pull/68984/
467 [69022]: https://github.com/rust-lang/rust/pull/69022/
468 [69185]: https://github.com/rust-lang/rust/pull/69185/
469 [69194]: https://github.com/rust-lang/rust/pull/69194/
470 [69201]: https://github.com/rust-lang/rust/pull/69201/
471 [69227]: https://github.com/rust-lang/rust/pull/69227/
472 [69548]: https://github.com/rust-lang/rust/pull/69548/
473 [69256]: https://github.com/rust-lang/rust/pull/69256/
474 [69361]: https://github.com/rust-lang/rust/pull/69361/
475 [69366]: https://github.com/rust-lang/rust/pull/69366/
476 [69538]: https://github.com/rust-lang/rust/pull/69538/
477 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
478 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
479 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
480 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
481 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
482 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
483 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
484 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
487 Version 1.42.0 (2020-03-12)
488 ==========================
492 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
494 fn foo(words: &[&str]) {
496 ["Hello", "World", "!", ..] => println!("Hello World!"),
497 ["Foo", "Bar", ..] => println!("Baz"),
498 rest => println!("{:?}", rest),
502 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
503 that you can create an enum that has the exact layout and ABI of the type
505 - [There are some *syntax-only* changes:][67131]
506 - `default` is syntactically allowed before items in `trait` definitions.
507 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
508 leave out their bodies in favor of `;`.
509 - Bounds on associated types in `impl`s are now syntactically allowed
510 (e.g. `type Foo: Ord;`).
511 - `...` (the C-variadic type) may occur syntactically directly as the type of
512 any function parameter.
514 These are still rejected *semantically*, so you will likely receive an error
515 but these changes can be seen and parsed by procedural macros and
516 conditional compilation.
520 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
521 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
522 - [`Option::{expect,unwrap}` and
523 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
524 pointing to the location where they were called, rather than
525 `core`'s internals. ][67887]
527 \* Refer to Rust's [platform support page][forge-platform-support] for more
528 information on Rust's tiered platform support.
532 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
533 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
534 to implement `Sized`.][67935]
535 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
536 - [`Layout::new` is now `const`.][66254]
537 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
542 - [`CondVar::wait_while`]
543 - [`CondVar::wait_timeout_while`]
545 - [`DebugMap::value`]
546 - [`ManuallyDrop::take`]
548 - [`ptr::slice_from_raw_parts_mut`]
549 - [`ptr::slice_from_raw_parts`]
553 - [You no longer need to include `extern crate proc_macro;` to be able to
554 `use proc_macro;` in the `2018` edition.][cargo/7700]
558 - [`Error::description` has been deprecated, and its use will now produce a
559 warning.][66919] It's recommended to use `Display`/`to_string` instead.
561 [68253]: https://github.com/rust-lang/rust/pull/68253/
562 [68348]: https://github.com/rust-lang/rust/pull/68348/
563 [67935]: https://github.com/rust-lang/rust/pull/67935/
564 [68339]: https://github.com/rust-lang/rust/pull/68339/
565 [68122]: https://github.com/rust-lang/rust/pull/68122/
566 [67712]: https://github.com/rust-lang/rust/pull/67712/
567 [67887]: https://github.com/rust-lang/rust/pull/67887/
568 [67131]: https://github.com/rust-lang/rust/pull/67131/
569 [67233]: https://github.com/rust-lang/rust/pull/67233/
570 [66899]: https://github.com/rust-lang/rust/pull/66899/
571 [66919]: https://github.com/rust-lang/rust/pull/66919/
572 [66254]: https://github.com/rust-lang/rust/pull/66254/
573 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
574 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
575 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
576 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
577 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
578 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
579 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
580 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
581 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
584 Version 1.41.1 (2020-02-27)
585 ===========================
587 * [Always check types of static items][69145]
588 * [Always check lifetime bounds of `Copy` impls][69145]
589 * [Fix miscompilation in callers of `Layout::repeat`][69225]
591 [69225]: https://github.com/rust-lang/rust/issues/69225
592 [69145]: https://github.com/rust-lang/rust/pull/69145
595 Version 1.41.0 (2020-01-30)
596 ===========================
601 - [You can now pass type parameters to foreign items when implementing
602 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
603 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
604 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
605 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
606 - [You can now use any valid identifier in a `format_args` macro.][66847]
607 Previously identifiers starting with an underscore were not allowed.
608 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
609 enum variants.][66183] These are still rejected semantically, but
610 can be seen and parsed by procedural macros and conditional compilation.
615 - [Rustc will now warn if you have unused loop `'label`s.][66325]
616 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
617 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
618 - [You can now pass an arguments file passing the `@path` syntax
619 to rustc.][66172] Note that the format differs somewhat from what is
620 found in other tooling; please see [the documentation][argfile-docs] for
622 - [You can now provide `--extern` flag without a path, indicating that it is
623 available from the search path or specified with an `-L` flag.][64882]
625 \* Refer to Rust's [platform support page][forge-platform-support] for more
626 information on Rust's tiered platform support.
628 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
633 - [The `core::panic` module is now stable.][66771] It was already stable
635 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
636 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
637 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
643 - [`Result::map_or_else`]
644 - [`std::rc::Weak::weak_count`]
645 - [`std::rc::Weak::strong_count`]
646 - [`std::sync::Weak::weak_count`]
647 - [`std::sync::Weak::strong_count`]
652 - [Cargo will now document all the private items for binary crates
653 by default.][cargo/7593]
654 - [`cargo-install` will now reinstall the package if it detects that it is out
655 of date.][cargo/7560]
656 - [Cargo.lock now uses a more git friendly format that should help to reduce
657 merge conflicts.][cargo/7579]
658 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
659 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
660 optimisation level to `2` for debug builds. You can also use
661 `[profile.<profile>.build-override]` to override build scripts and
667 - [You can now specify `edition` in documentation code blocks to compile the block
668 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
669 should be compiled the 2018 edition of Rust.
670 - [You can now provide custom themes to rustdoc with `--theme`, and check the
671 current theme with `--check-theme`.][54733]
672 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
677 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
678 Apple targets.][apple-32bit-drop] This means that the source code is still
679 available to build, but the targets are no longer being tested and release
680 binaries for those platforms will no longer be distributed by the Rust project.
681 Please refer to the linked blog post for more information.
683 [54733]: https://github.com/rust-lang/rust/pull/54733/
684 [61351]: https://github.com/rust-lang/rust/pull/61351/
685 [67255]: https://github.com/rust-lang/rust/pull/67255/
686 [66661]: https://github.com/rust-lang/rust/pull/66661/
687 [66771]: https://github.com/rust-lang/rust/pull/66771/
688 [66847]: https://github.com/rust-lang/rust/pull/66847/
689 [66238]: https://github.com/rust-lang/rust/pull/66238/
690 [66277]: https://github.com/rust-lang/rust/pull/66277/
691 [66325]: https://github.com/rust-lang/rust/pull/66325/
692 [66172]: https://github.com/rust-lang/rust/pull/66172/
693 [66183]: https://github.com/rust-lang/rust/pull/66183/
694 [65879]: https://github.com/rust-lang/rust/pull/65879/
695 [65013]: https://github.com/rust-lang/rust/pull/65013/
696 [64882]: https://github.com/rust-lang/rust/pull/64882/
697 [64325]: https://github.com/rust-lang/rust/pull/64325/
698 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
699 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
700 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
701 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
702 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
703 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
704 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
705 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
706 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
707 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
708 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
710 Version 1.40.0 (2019-12-19)
711 ===========================
715 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
716 `const` contexts.][65188] e.g.
719 pub struct Point(i32, i32);
721 const ORIGIN: Point = {
722 let constructor = Point;
728 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
729 indicate that there may be variants or fields added in the future.][64639]
730 For example this requires adding a wild-card branch (`_ => {}`) to any match
731 statements on a non-exhaustive `enum`. [(RFC 2008)]
732 - [You can now use function-like procedural macros in `extern` blocks and in
733 type positions.][63931] e.g. `type Generated = macro!();`
734 - [Function-like and attribute procedural macros can now emit
735 `macro_rules!` items, so you can now have your macros generate macros.][64035]
736 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
737 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
738 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
742 - [Added tier 3 support\* for the
743 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
744 - [Added tier 3 support for the
745 `aarch64-unknown-none-softfloat` target.][64589]
746 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
747 `mips64el-unknown-linux-muslabi64` targets.][65843]
749 \* Refer to Rust's [platform support page][forge-platform-support] for more
750 information on Rust's tiered platform support.
754 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
758 - [`BTreeMap::get_key_value`]
759 - [`HashMap::get_key_value`]
760 - [`Option::as_deref_mut`]
761 - [`Option::as_deref`]
762 - [`Option::flatten`]
763 - [`UdpSocket::peer_addr`]
764 - [`f32::to_be_bytes`]
765 - [`f32::to_le_bytes`]
766 - [`f32::to_ne_bytes`]
767 - [`f64::to_be_bytes`]
768 - [`f64::to_le_bytes`]
769 - [`f64::to_ne_bytes`]
770 - [`f32::from_be_bytes`]
771 - [`f32::from_le_bytes`]
772 - [`f32::from_ne_bytes`]
773 - [`f64::from_be_bytes`]
774 - [`f64::from_le_bytes`]
775 - [`f64::from_ne_bytes`]
782 - [Cargo will now always display warnings, rather than only on
783 fresh builds.][cargo/7450]
784 - [Feature flags (except `--all-features`) passed to a virtual workspace will
785 now produce an error.][cargo/7507] Previously these flags were ignored.
786 - [You can now publish `dev-dependencies` without including
787 a `version`.][cargo/7333]
791 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
792 when running documentation tests with `rustdoc`.][63803]
796 - [As previously announced, any previous NLL warnings in the 2015 edition are
797 now hard errors.][64221]
798 - [The `include!` macro will now warn if it failed to include the
799 entire file.][64284] The `include!` macro unintentionally only includes the
800 first _expression_ in a file, and this can be unintuitive. This will become
801 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
802 - [Using `#[inline]` on function prototypes and consts now emits a warning under
803 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
804 or `extern` blocks now correctly emits a hard error.
806 [65294]: https://github.com/rust-lang/rust/pull/65294/
807 [66103]: https://github.com/rust-lang/rust/pull/66103/
808 [65843]: https://github.com/rust-lang/rust/pull/65843/
809 [65188]: https://github.com/rust-lang/rust/pull/65188/
810 [65092]: https://github.com/rust-lang/rust/pull/65092/
811 [64589]: https://github.com/rust-lang/rust/pull/64589/
812 [64639]: https://github.com/rust-lang/rust/pull/64639/
813 [64221]: https://github.com/rust-lang/rust/pull/64221/
814 [64284]: https://github.com/rust-lang/rust/pull/64284/
815 [63931]: https://github.com/rust-lang/rust/pull/63931/
816 [64035]: https://github.com/rust-lang/rust/pull/64035/
817 [63674]: https://github.com/rust-lang/rust/pull/63674/
818 [63803]: https://github.com/rust-lang/rust/pull/63803/
819 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
820 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
821 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
822 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
823 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
824 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
825 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
826 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
827 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
828 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
829 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
830 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
831 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
832 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
833 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
834 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
835 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
836 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
837 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
838 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
839 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
840 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
841 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
842 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
843 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
844 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
847 Version 1.39.0 (2019-11-07)
848 ===========================
852 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
853 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
854 - [You can now use certain attributes on function, closure, and function pointer
855 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
856 `deny`, `forbid` as well as inert helper attributes used by procedural macro
857 attributes applied to items. e.g.
860 #[cfg(windows)] slice: &[u16],
861 #[cfg(not(windows))] slice: &[u8],
866 - [You can now take shared references to bind-by-move patterns in the `if` guards
867 of `match` arms.][63118] e.g.
870 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
874 // ---- `nums` is bound by move.
875 if nums.iter().sum::<u8>() == 10
876 // ^------ `.iter()` implicitly takes a reference to `nums`.
879 // ----------- Legal as `nums` was bound by move and so we have ownership.
890 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
891 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
892 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
893 **Note** Cargo currently doesn't use this feature. Refer to
894 [cargo#7315][cargo/7315] to track this feature's progress.
895 - [You can now pass `--show-output` argument to test binaries to print the
896 output of successful tests.][62600]
899 \* Refer to Rust's [platform support page][forge-platform-support] for more
900 information on Rust's tiered platform support.
904 - [`Vec::new` and `String::new` are now `const` functions.][64028]
905 - [`LinkedList::new` is now a `const` function.][63684]
906 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
907 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
912 - [`Pin::into_inner`]
913 - [`Instant::checked_duration_since`]
914 - [`Instant::saturating_duration_since`]
918 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
919 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
920 `--all` is now deprecated.
924 - [You can now pass `-Clinker` to rustdoc to control the linker used
925 for compiling doctests.][63834]
929 - [Code that was previously accepted by the old borrow checker, but rejected by
930 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
931 previously a warning, and will also become a hard error in the Rust 2015
932 edition in the 1.40.0 release.
933 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
934 run tests.][63827] This should improve performance when running a large
936 - [The `try!` macro will now issue a deprecation warning.][62672] It is
937 recommended to use the `?` operator instead.
938 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
941 [62600]: https://github.com/rust-lang/rust/pull/62600/
942 [62672]: https://github.com/rust-lang/rust/pull/62672/
943 [63118]: https://github.com/rust-lang/rust/pull/63118/
944 [63209]: https://github.com/rust-lang/rust/pull/63209/
945 [63402]: https://github.com/rust-lang/rust/pull/63402/
946 [63565]: https://github.com/rust-lang/rust/pull/63565/
947 [63595]: https://github.com/rust-lang/rust/pull/63595/
948 [63684]: https://github.com/rust-lang/rust/pull/63684/
949 [63698]: https://github.com/rust-lang/rust/pull/63698/
950 [63770]: https://github.com/rust-lang/rust/pull/63770/
951 [63786]: https://github.com/rust-lang/rust/pull/63786/
952 [63827]: https://github.com/rust-lang/rust/pull/63827/
953 [63834]: https://github.com/rust-lang/rust/pull/63834/
954 [63927]: https://github.com/rust-lang/rust/pull/63927/
955 [63933]: https://github.com/rust-lang/rust/pull/63933/
956 [63934]: https://github.com/rust-lang/rust/pull/63934/
957 [63938]: https://github.com/rust-lang/rust/pull/63938/
958 [63940]: https://github.com/rust-lang/rust/pull/63940/
959 [63941]: https://github.com/rust-lang/rust/pull/63941/
960 [63945]: https://github.com/rust-lang/rust/pull/63945/
961 [64010]: https://github.com/rust-lang/rust/pull/64010/
962 [64028]: https://github.com/rust-lang/rust/pull/64028/
963 [64334]: https://github.com/rust-lang/rust/pull/64334/
964 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
965 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
966 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
967 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
968 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
969 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
971 Version 1.38.0 (2019-09-26)
972 ==========================
976 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
977 - [The `#[deprecated]` attribute can now be used on macros.][62042]
981 - [Added pipelined compilation support to `rustc`.][62766] This will
982 improve compilation times in some cases. For further information please refer
983 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
984 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
985 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
986 `x86_64-uwp-windows-msvc` targets.][60260]
987 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
988 `armv7-unknown-linux-musleabi` targets.][63107]
989 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
990 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
992 \* Refer to Rust's [platform support page][forge-platform-support] for more
993 information on Rust's tiered platform support.
997 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
998 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
999 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1000 is available at `std::clone::Clone`). This also makes all built-in macros
1001 available in `std`/`core` root. e.g. `std::include_bytes!`.
1002 - [`str::Chars` now implements `Debug`.][63000]
1003 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1004 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1005 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1006 - [Added euclidean remainder and division operations (`div_euclid`,
1007 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1008 `overflowing`, and `wrapping` versions are available for all
1010 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1011 `PartialEq`.][61491]
1012 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1016 - [`<*const T>::cast`]
1017 - [`<*mut T>::cast`]
1018 - [`Duration::as_secs_f32`]
1019 - [`Duration::as_secs_f64`]
1020 - [`Duration::div_f32`]
1021 - [`Duration::div_f64`]
1022 - [`Duration::from_secs_f32`]
1023 - [`Duration::from_secs_f64`]
1024 - [`Duration::mul_f32`]
1025 - [`Duration::mul_f64`]
1026 - [`any::type_name`]
1030 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1031 - [You can now pass the `--features` option multiple times to enable
1032 multiple features.][cargo/7084]
1036 - [`rustc` will now warn about some incorrect uses of
1037 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1041 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1043 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1044 issues][62896] with certain crates such as libc.
1046 [60260]: https://github.com/rust-lang/rust/pull/60260/
1047 [61457]: https://github.com/rust-lang/rust/pull/61457/
1048 [61491]: https://github.com/rust-lang/rust/pull/61491/
1049 [61884]: https://github.com/rust-lang/rust/pull/61884/
1050 [61953]: https://github.com/rust-lang/rust/pull/61953/
1051 [62042]: https://github.com/rust-lang/rust/pull/62042/
1052 [62528]: https://github.com/rust-lang/rust/pull/62528/
1053 [62583]: https://github.com/rust-lang/rust/pull/62583/
1054 [62735]: https://github.com/rust-lang/rust/pull/62735/
1055 [62766]: https://github.com/rust-lang/rust/pull/62766/
1056 [62784]: https://github.com/rust-lang/rust/pull/62784/
1057 [62785]: https://github.com/rust-lang/rust/issues/62785/
1058 [62814]: https://github.com/rust-lang/rust/pull/62814/
1059 [62896]: https://github.com/rust-lang/rust/issues/62896/
1060 [63000]: https://github.com/rust-lang/rust/pull/63000/
1061 [63056]: https://github.com/rust-lang/rust/pull/63056/
1062 [63107]: https://github.com/rust-lang/rust/pull/63107/
1063 [63346]: https://github.com/rust-lang/rust/pull/63346/
1064 [63421]: https://github.com/rust-lang/rust/pull/63421/
1065 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1066 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1067 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1068 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1069 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1070 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1071 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1072 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1073 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1074 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1075 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1076 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1077 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1078 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1079 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1081 Version 1.37.0 (2019-08-15)
1082 ==========================
1086 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1087 [`Box`][62228], or an [array][62235] and unused.
1088 - [You can now use the `cfg` and `cfg_attr` attributes on
1089 generic parameters.][61547]
1090 - [You can now use enum variants through type alias.][61682] e.g. You can
1091 write the following:
1093 type MyOption = Option<u8>;
1095 fn increment_or_zero(x: MyOption) -> u8 {
1097 MyOption::Some(y) => y + 1,
1098 MyOption::None => 0,
1102 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1103 `const _: u32 = 5;`.
1104 - [You can now use `#[repr(align(X)]` on enums.][61229]
1105 - [The `?` Kleene macro operator is now available in the
1106 2015 edition.][60932]
1110 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1111 and `-C profile-use` flags.][61268] For more information on how to use profile
1112 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1113 - [The `rust-lldb` wrapper script should now work again.][61827]
1117 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1121 - [`BufReader::buffer`]
1122 - [`BufWriter::buffer`]
1123 - [`Cell::from_mut`]
1124 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1125 - [`DoubleEndedIterator::nth_back`]
1127 - [`Wrapping::reverse_bits`]
1128 - [`i128::reverse_bits`]
1129 - [`i16::reverse_bits`]
1130 - [`i32::reverse_bits`]
1131 - [`i64::reverse_bits`]
1132 - [`i8::reverse_bits`]
1133 - [`isize::reverse_bits`]
1134 - [`slice::copy_within`]
1135 - [`u128::reverse_bits`]
1136 - [`u16::reverse_bits`]
1137 - [`u32::reverse_bits`]
1138 - [`u64::reverse_bits`]
1139 - [`u8::reverse_bits`]
1140 - [`usize::reverse_bits`]
1144 - [`Cargo.lock` files are now included by default when publishing executable crates
1145 with executables.][cargo/7026]
1146 - [You can now specify `default-run="foo"` in `[package]` to specify the
1147 default executable to use for `cargo run`.][cargo/7056]
1154 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1155 Please transition your code to using the `..=` syntax for inclusive
1157 - [Using a trait object without the `dyn` will now warn by default.][61203]
1158 Please transition your code to use `dyn Trait` for trait objects instead.
1160 [62228]: https://github.com/rust-lang/rust/pull/62228/
1161 [62235]: https://github.com/rust-lang/rust/pull/62235/
1162 [61802]: https://github.com/rust-lang/rust/pull/61802/
1163 [61827]: https://github.com/rust-lang/rust/pull/61827/
1164 [61547]: https://github.com/rust-lang/rust/pull/61547/
1165 [61682]: https://github.com/rust-lang/rust/pull/61682/
1166 [61268]: https://github.com/rust-lang/rust/pull/61268/
1167 [61342]: https://github.com/rust-lang/rust/pull/61342/
1168 [61347]: https://github.com/rust-lang/rust/pull/61347/
1169 [61100]: https://github.com/rust-lang/rust/pull/61100/
1170 [61203]: https://github.com/rust-lang/rust/pull/61203/
1171 [61229]: https://github.com/rust-lang/rust/pull/61229/
1172 [60932]: https://github.com/rust-lang/rust/pull/60932/
1173 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1174 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1175 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1176 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1177 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1178 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1179 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1180 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1181 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1182 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1183 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1184 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1185 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1186 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1187 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1188 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1189 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1190 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1191 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1192 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1193 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1194 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1195 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1196 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1199 Version 1.36.0 (2019-07-04)
1200 ==========================
1204 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1205 - [The order of traits in trait objects no longer affects the semantics of that
1206 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1207 `dyn fmt::Debug + Send`, where this was previously not the case.
1211 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1212 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1213 - [`mem::needs_drop` is now available as a const fn.][60364]
1214 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1215 - [`String` now implements `BorrowMut<str>`.][60404]
1216 - [`io::Cursor` now implements `Default`.][60234]
1217 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1218 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1219 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1220 environment has access to heap memory allocation.
1221 - [`String` now implements `From<&String>`.][59825]
1222 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1223 return a tuple of each argument when there is multiple arguments.
1224 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1229 - [`VecDeque::rotate_left`]
1230 - [`VecDeque::rotate_right`]
1231 - [`Iterator::copied`]
1233 - [`io::IoSliceMut`]
1234 - [`Read::read_vectored`]
1235 - [`Write::write_vectored`]
1236 - [`str::as_mut_ptr`]
1237 - [`mem::MaybeUninit`]
1238 - [`pointer::align_offset`]
1239 - [`future::Future`]
1241 - [`task::RawWaker`]
1242 - [`task::RawWakerVTable`]
1248 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1249 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1251 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1255 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1262 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1263 longer recommended, and will be deprecated in 1.39.0.
1265 [60318]: https://github.com/rust-lang/rust/pull/60318/
1266 [60364]: https://github.com/rust-lang/rust/pull/60364/
1267 [60370]: https://github.com/rust-lang/rust/pull/60370/
1268 [60404]: https://github.com/rust-lang/rust/pull/60404/
1269 [60234]: https://github.com/rust-lang/rust/pull/60234/
1270 [60244]: https://github.com/rust-lang/rust/pull/60244/
1271 [58623]: https://github.com/rust-lang/rust/pull/58623/
1272 [59648]: https://github.com/rust-lang/rust/pull/59648/
1273 [59675]: https://github.com/rust-lang/rust/pull/59675/
1274 [59825]: https://github.com/rust-lang/rust/pull/59825/
1275 [59826]: https://github.com/rust-lang/rust/pull/59826/
1276 [59445]: https://github.com/rust-lang/rust/pull/59445/
1277 [59114]: https://github.com/rust-lang/rust/pull/59114/
1278 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1279 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1280 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1281 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1282 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1283 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1284 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1285 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1286 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1287 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1288 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1289 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1290 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1291 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1292 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1293 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1294 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1295 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1296 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1297 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1300 Version 1.35.0 (2019-05-23)
1301 ==========================
1305 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1306 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1307 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1309 unsafe fn call_unsafe(func: unsafe fn()) {
1314 unsafe { call_unsafe(|| {}); }
1321 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1322 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1323 - [Added the `wasm32-unknown-wasi` target.][59464]
1328 - [`Thread` will now show its ID in `Debug` output.][59460]
1329 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1330 - [`alloc::System` now implements `Default`.][59451]
1331 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1333 - [`char::{ToLowercase, ToUppercase}` now
1334 implement `ExactSizeIterator`.][58778]
1335 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1336 - [Removed the `Read` trait bounds
1337 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1338 - [You can now call the `dbg!` macro without any parameters to print the file
1339 and line where it is called.][57847]
1340 - [In place ASCII case conversions are now up to 4× faster.][59283]
1341 e.g. `str::make_ascii_lowercase`
1342 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1349 - [`RefCell::replace_with`]
1350 - [`RefCell::map_split`]
1352 - [`Range::contains`]
1353 - [`RangeFrom::contains`]
1354 - [`RangeTo::contains`]
1355 - [`RangeInclusive::contains`]
1356 - [`RangeToInclusive::contains`]
1357 - [`Option::copied`]
1361 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1362 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1367 - [The Rust toolchain is now available natively for musl based distros.][58575]
1369 [59460]: https://github.com/rust-lang/rust/pull/59460/
1370 [59464]: https://github.com/rust-lang/rust/pull/59464/
1371 [59500]: https://github.com/rust-lang/rust/pull/59500/
1372 [59512]: https://github.com/rust-lang/rust/pull/59512/
1373 [59580]: https://github.com/rust-lang/rust/pull/59580/
1374 [59283]: https://github.com/rust-lang/rust/pull/59283/
1375 [59451]: https://github.com/rust-lang/rust/pull/59451/
1376 [59076]: https://github.com/rust-lang/rust/pull/59076/
1377 [58778]: https://github.com/rust-lang/rust/pull/58778/
1378 [58717]: https://github.com/rust-lang/rust/pull/58717/
1379 [58369]: https://github.com/rust-lang/rust/pull/58369/
1380 [58423]: https://github.com/rust-lang/rust/pull/58423/
1381 [58080]: https://github.com/rust-lang/rust/pull/58080/
1382 [57847]: https://github.com/rust-lang/rust/pull/57847/
1383 [58575]: https://github.com/rust-lang/rust/pull/58575
1384 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1385 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1386 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1387 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1388 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1389 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1390 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1391 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1392 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1393 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1394 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1395 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1397 Version 1.34.2 (2019-05-14)
1398 ===========================
1400 * [Destabilize the `Error::type_id` function due to a security
1401 vulnerability][60785] ([CVE-2019-12083])
1403 [60785]: https://github.com/rust-lang/rust/pull/60785
1404 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1406 Version 1.34.1 (2019-04-25)
1407 ===========================
1409 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1410 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1411 * [Fix Clippy panic when checking some macros][clippy/3805]
1413 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1414 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1415 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1417 Version 1.34.0 (2019-04-11)
1418 ==========================
1422 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1423 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1425 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1426 `#[attr{}]` procedural macros.][57367]
1427 - [You can now write `extern crate self as foo;`][57407] to import your
1428 crate's root into the extern prelude.
1433 - [You can now target `riscv64imac-unknown-none-elf` and
1434 `riscv64gc-unknown-none-elf`.][58406]
1435 - [You can now enable linker plugin LTO optimisations with
1436 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1437 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1439 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1444 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1445 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1446 the `Hash` trait to create an iterator.
1447 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1448 methods.][58421] Most notably you no longer require the `Ord` trait to create
1450 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1451 for all numeric types.][58044]
1452 - [Indexing a `str` is now generic over all types that
1453 implement `SliceIndex<str>`.][57604]
1454 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1455 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1456 produce a warning if their returning type is unused.
1457 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1458 `overflowing_pow` are now available for all numeric types.][57873] These are
1459 equivalent to methods such as `wrapping_add` for the `pow` operation.
1467 * [`Error::type_id`]
1468 * [`atomic::AtomicI16`]
1469 * [`atomic::AtomicI32`]
1470 * [`atomic::AtomicI64`]
1471 * [`atomic::AtomicI8`]
1472 * [`atomic::AtomicU16`]
1473 * [`atomic::AtomicU32`]
1474 * [`atomic::AtomicU64`]
1475 * [`atomic::AtomicU8`]
1476 * [`convert::Infallible`]
1477 * [`convert::TryFrom`]
1478 * [`convert::TryInto`]
1480 * [`iter::successors`]
1481 * [`num::NonZeroI128`]
1482 * [`num::NonZeroI16`]
1483 * [`num::NonZeroI32`]
1484 * [`num::NonZeroI64`]
1485 * [`num::NonZeroI8`]
1486 * [`num::NonZeroIsize`]
1487 * [`slice::sort_by_cached_key`]
1488 * [`str::escape_debug`]
1489 * [`str::escape_default`]
1490 * [`str::escape_unicode`]
1491 * [`str::split_ascii_whitespace`]
1494 * [`Instant::checked_add`]
1495 * [`Instant::checked_sub`]
1496 * [`SystemTime::checked_add`]
1497 * [`SystemTime::checked_sub`]
1501 - [You can now use alternative registries to crates.io.][cargo/6654]
1505 - [You can now use the `?` operator in your documentation tests without manually
1506 adding `fn main() -> Result<(), _> {}`.][56470]
1510 - [`Command::before_exec` is being replaced by the unsafe method
1511 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1512 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1513 can now use `const` functions in `static` variables.
1515 [58370]: https://github.com/rust-lang/rust/pull/58370/
1516 [58406]: https://github.com/rust-lang/rust/pull/58406/
1517 [58421]: https://github.com/rust-lang/rust/pull/58421/
1518 [58166]: https://github.com/rust-lang/rust/pull/58166/
1519 [58044]: https://github.com/rust-lang/rust/pull/58044/
1520 [58057]: https://github.com/rust-lang/rust/pull/58057/
1521 [58059]: https://github.com/rust-lang/rust/pull/58059/
1522 [57809]: https://github.com/rust-lang/rust/pull/57809/
1523 [57873]: https://github.com/rust-lang/rust/pull/57873/
1524 [57604]: https://github.com/rust-lang/rust/pull/57604/
1525 [57367]: https://github.com/rust-lang/rust/pull/57367/
1526 [57407]: https://github.com/rust-lang/rust/pull/57407/
1527 [57425]: https://github.com/rust-lang/rust/pull/57425/
1528 [57106]: https://github.com/rust-lang/rust/pull/57106/
1529 [56470]: https://github.com/rust-lang/rust/pull/56470/
1530 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1531 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1532 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1533 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1534 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1535 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1536 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1537 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1538 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1539 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1540 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1541 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1542 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1543 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1544 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1545 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1546 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1547 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1548 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1549 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1550 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1551 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1552 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1553 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1554 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1555 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1556 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1557 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1558 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1559 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1560 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1563 Version 1.33.0 (2019-02-28)
1564 ==========================
1568 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1569 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1570 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1571 E.g. You can have match statement on a `u8` that covers `0..=255` and
1572 you would no longer be required to have a `_ => unreachable!()` case.
1573 - [You can now have multiple patterns in `if let` and `while let`
1574 expressions.][57532] You can do this with the same syntax as a `match`
1584 let state = Creature::Crab("Ferris");
1586 if let Creature::Crab(name) | Creature::Person(name) = state {
1587 println!("This creature's name is: {}", name);
1591 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1592 this feature will by default produce a warning as this behaviour can be
1593 unintuitive. E.g. `if let _ = 5 {}`
1594 - [You can now use `let` bindings, assignments, expression statements,
1595 and irrefutable pattern destructuring in const functions.][57175]
1596 - [You can now call unsafe const functions.][57067] E.g.
1598 const unsafe fn foo() -> i32 { 5 }
1599 const fn bar() -> i32 {
1603 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1604 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1605 - [You can now specify a specific alignment with the `#[repr(packed)]`
1606 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1607 with an alignment of 2 bytes and a size of 6 bytes.
1608 - [You can now import an item from a module as an `_`.][56303] This allows you to
1609 import a trait's impls, and not have the name in the namespace. E.g.
1611 use std::io::Read as _;
1613 // Allowed as there is only one `Read` in the module.
1616 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1620 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1621 command line argument.][56351]
1622 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1623 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1624 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1625 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1626 information on Rust's platform support.
1627 - [Added support for the `thumbv7neon-linux-androideabi` and
1628 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1629 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1633 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1634 functions for all numeric types.][57566]
1635 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1636 are now `const` functions for all numeric types.][57105]
1637 - [The methods `is_positive` and `is_negative` are now `const` functions for
1638 all signed numeric types.][57105]
1639 - [The `get` method for all `NonZero` types is now `const`.][57167]
1640 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1641 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1642 numeric types.][57234]
1643 - [`Ipv4Addr::new` is now a `const` function][57234]
1647 - [`unix::FileExt::read_exact_at`]
1648 - [`unix::FileExt::write_all_at`]
1649 - [`Option::transpose`]
1650 - [`Result::transpose`]
1651 - [`convert::identity`]
1654 - [`marker::PhantomPinned`]
1655 - [`Vec::resize_with`]
1656 - [`VecDeque::resize_with`]
1657 - [`Duration::as_millis`]
1658 - [`Duration::as_micros`]
1659 - [`Duration::as_nanos`]
1664 - [You can now publish crates that require a feature flag to compile with
1665 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1666 - [Cargo should now rebuild a crate if a file was modified during the initial
1671 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1672 are now deprecated in the standard library, and their usage will now produce a warning.
1673 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1675 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1677 - [Libtest no longer creates a new thread for each test when
1678 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1680 [55982]: https://github.com/rust-lang/rust/pull/55982/
1681 [56243]: https://github.com/rust-lang/rust/pull/56243
1682 [56303]: https://github.com/rust-lang/rust/pull/56303/
1683 [56351]: https://github.com/rust-lang/rust/pull/56351/
1684 [56362]: https://github.com/rust-lang/rust/pull/56362
1685 [56642]: https://github.com/rust-lang/rust/pull/56642/
1686 [56769]: https://github.com/rust-lang/rust/pull/56769/
1687 [56805]: https://github.com/rust-lang/rust/pull/56805
1688 [56947]: https://github.com/rust-lang/rust/pull/56947/
1689 [57049]: https://github.com/rust-lang/rust/pull/57049/
1690 [57067]: https://github.com/rust-lang/rust/pull/57067/
1691 [57105]: https://github.com/rust-lang/rust/pull/57105
1692 [57130]: https://github.com/rust-lang/rust/pull/57130/
1693 [57167]: https://github.com/rust-lang/rust/pull/57167/
1694 [57175]: https://github.com/rust-lang/rust/pull/57175/
1695 [57234]: https://github.com/rust-lang/rust/pull/57234/
1696 [57332]: https://github.com/rust-lang/rust/pull/57332/
1697 [57465]: https://github.com/rust-lang/rust/pull/57465/
1698 [57532]: https://github.com/rust-lang/rust/pull/57532/
1699 [57535]: https://github.com/rust-lang/rust/pull/57535/
1700 [57566]: https://github.com/rust-lang/rust/pull/57566/
1701 [57615]: https://github.com/rust-lang/rust/pull/57615/
1702 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1703 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1704 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1705 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1706 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1707 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1708 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1709 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1710 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1711 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1712 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1713 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1714 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1715 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1716 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1717 [platform-support]: https://forge.rust-lang.org/platform-support.html
1719 Version 1.32.0 (2019-01-17)
1720 ==========================
1725 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1726 operator allows you to specify zero or one repetitions similar to the `*` and
1728 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1729 now always resolve to the item (`enum`, `struct`, etc.) available in the
1730 module if present, before resolving to a external crate or an item the prelude.][56759]
1733 enum Color { Red, Green, Blue }
1739 - [You can now match against `PhantomData<T>` types.][55837]
1740 - [You can now match against literals in macros with the `literal`
1741 specifier.][56072] This will match against a literal of any type.
1742 E.g. `1`, `'A'`, `"Hello World"`
1743 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1745 struct Point(i32, i32);
1748 pub fn new(x: i32, y: i32) -> Self {
1752 pub fn is_origin(&self) -> bool {
1760 - [Self can also now be used in type definitions.][56366] E.g.
1764 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1767 Cons(T, Box<Self>) // likewise here
1770 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1771 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1775 - [The default allocator has changed from jemalloc to the default allocator on
1776 your system.][55238] The compiler itself on Linux & macOS will still use
1777 jemalloc, but programs compiled with it will use the system allocator.
1778 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1782 - [`PathBuf` now implements `FromStr`.][55148]
1783 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1784 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1785 easily debug expressions in your rust program. E.g.
1788 let b = dbg!(a * 2) + 1;
1789 // ^-- prints: [src/main.rs:4] a * 2 = 4
1793 The following APIs are now `const` functions and can be used in a
1797 - [`UnsafeCell::get`]
1798 - [`char::is_ascii`]
1800 - [`ManuallyDrop::new`]
1801 - [`ManuallyDrop::into_inner`]
1802 - [`RangeInclusive::start`]
1803 - [`RangeInclusive::end`]
1804 - [`NonNull::as_ptr`]
1807 - [`Duration::as_secs`]
1808 - [`Duration::subsec_millis`]
1809 - [`Duration::subsec_micros`]
1810 - [`Duration::subsec_nanos`]
1812 - [`Ipv4Addr::is_unspecified`]
1814 - [`Ipv6Addr::octets`]
1818 - [`i8::to_be_bytes`]
1819 - [`i8::to_le_bytes`]
1820 - [`i8::to_ne_bytes`]
1821 - [`i8::from_be_bytes`]
1822 - [`i8::from_le_bytes`]
1823 - [`i8::from_ne_bytes`]
1824 - [`i16::to_be_bytes`]
1825 - [`i16::to_le_bytes`]
1826 - [`i16::to_ne_bytes`]
1827 - [`i16::from_be_bytes`]
1828 - [`i16::from_le_bytes`]
1829 - [`i16::from_ne_bytes`]
1830 - [`i32::to_be_bytes`]
1831 - [`i32::to_le_bytes`]
1832 - [`i32::to_ne_bytes`]
1833 - [`i32::from_be_bytes`]
1834 - [`i32::from_le_bytes`]
1835 - [`i32::from_ne_bytes`]
1836 - [`i64::to_be_bytes`]
1837 - [`i64::to_le_bytes`]
1838 - [`i64::to_ne_bytes`]
1839 - [`i64::from_be_bytes`]
1840 - [`i64::from_le_bytes`]
1841 - [`i64::from_ne_bytes`]
1842 - [`i128::to_be_bytes`]
1843 - [`i128::to_le_bytes`]
1844 - [`i128::to_ne_bytes`]
1845 - [`i128::from_be_bytes`]
1846 - [`i128::from_le_bytes`]
1847 - [`i128::from_ne_bytes`]
1848 - [`isize::to_be_bytes`]
1849 - [`isize::to_le_bytes`]
1850 - [`isize::to_ne_bytes`]
1851 - [`isize::from_be_bytes`]
1852 - [`isize::from_le_bytes`]
1853 - [`isize::from_ne_bytes`]
1854 - [`u8::to_be_bytes`]
1855 - [`u8::to_le_bytes`]
1856 - [`u8::to_ne_bytes`]
1857 - [`u8::from_be_bytes`]
1858 - [`u8::from_le_bytes`]
1859 - [`u8::from_ne_bytes`]
1860 - [`u16::to_be_bytes`]
1861 - [`u16::to_le_bytes`]
1862 - [`u16::to_ne_bytes`]
1863 - [`u16::from_be_bytes`]
1864 - [`u16::from_le_bytes`]
1865 - [`u16::from_ne_bytes`]
1866 - [`u32::to_be_bytes`]
1867 - [`u32::to_le_bytes`]
1868 - [`u32::to_ne_bytes`]
1869 - [`u32::from_be_bytes`]
1870 - [`u32::from_le_bytes`]
1871 - [`u32::from_ne_bytes`]
1872 - [`u64::to_be_bytes`]
1873 - [`u64::to_le_bytes`]
1874 - [`u64::to_ne_bytes`]
1875 - [`u64::from_be_bytes`]
1876 - [`u64::from_le_bytes`]
1877 - [`u64::from_ne_bytes`]
1878 - [`u128::to_be_bytes`]
1879 - [`u128::to_le_bytes`]
1880 - [`u128::to_ne_bytes`]
1881 - [`u128::from_be_bytes`]
1882 - [`u128::from_le_bytes`]
1883 - [`u128::from_ne_bytes`]
1884 - [`usize::to_be_bytes`]
1885 - [`usize::to_le_bytes`]
1886 - [`usize::to_ne_bytes`]
1887 - [`usize::from_be_bytes`]
1888 - [`usize::from_le_bytes`]
1889 - [`usize::from_ne_bytes`]
1893 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1894 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1898 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1902 - [The argument types for AVX's
1903 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1904 been changed from `*const` to `*mut` as the previous implementation
1908 [55148]: https://github.com/rust-lang/rust/pull/55148/
1909 [55238]: https://github.com/rust-lang/rust/pull/55238/
1910 [55280]: https://github.com/rust-lang/rust/pull/55280/
1911 [55610]: https://github.com/rust-lang/rust/pull/55610/
1912 [55663]: https://github.com/rust-lang/rust/pull/55663/
1913 [55702]: https://github.com/rust-lang/rust/pull/55702/
1914 [55837]: https://github.com/rust-lang/rust/pull/55837/
1915 [55843]: https://github.com/rust-lang/rust/pull/55843/
1916 [56072]: https://github.com/rust-lang/rust/pull/56072/
1917 [56245]: https://github.com/rust-lang/rust/pull/56245/
1918 [56365]: https://github.com/rust-lang/rust/pull/56365/
1919 [56366]: https://github.com/rust-lang/rust/pull/56366/
1920 [56395]: https://github.com/rust-lang/rust/pull/56395/
1921 [56759]: https://github.com/rust-lang/rust/pull/56759/
1922 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1923 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1924 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1925 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1926 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1927 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1928 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1929 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1930 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1931 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1932 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1933 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1934 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1935 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1936 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1937 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1938 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1939 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1940 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1941 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1942 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1943 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1944 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1945 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1946 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1947 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1948 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1949 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1950 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1951 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1952 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1953 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1954 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1955 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1956 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1957 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1958 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1959 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1960 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1961 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1962 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1963 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1964 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1965 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1966 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1967 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1968 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1969 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1970 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1971 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1972 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1973 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1974 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1975 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1976 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1977 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1978 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1979 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1980 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1981 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1982 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1983 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1984 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1985 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1986 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1987 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1988 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1989 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1990 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1991 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1992 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1993 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1994 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1995 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1996 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1997 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1998 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1999 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2000 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2001 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2002 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2003 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2004 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2005 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2006 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2007 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2008 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2009 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2010 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2011 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2012 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2013 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2014 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2017 Version 1.31.1 (2018-12-20)
2018 ===========================
2020 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2021 - [Fix broken go-to-definition in RLS][rls/1171]
2022 - [Fix infinite loop on hover in RLS][rls/1170]
2024 [56562]: https://github.com/rust-lang/rust/pull/56562
2025 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2026 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2028 Version 1.31.0 (2018-12-06)
2029 ==========================
2033 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2034 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2035 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2036 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2038 - [You can now define and use `const` functions.][54835] These are currently
2039 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2040 [language reference][const-reference] for what exactly is available.
2041 - [You can now use tool lints, which allow you to scope lints from external
2042 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2043 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2044 a crate, not just in exported functions.][54451]
2045 - [You can now use parentheses in pattern matches.][54497]
2049 - [Updated musl to 1.1.20][54430]
2053 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2054 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2055 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2056 into `Option<&mut T>` using the `From` trait.][53218]
2057 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2062 - [`slice::align_to`]
2063 - [`slice::align_to_mut`]
2064 - [`slice::chunks_exact`]
2065 - [`slice::chunks_exact_mut`]
2066 - [`slice::rchunks`]
2067 - [`slice::rchunks_mut`]
2068 - [`slice::rchunks_exact`]
2069 - [`slice::rchunks_exact_mut`]
2070 - [`Option::replace`]
2074 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2075 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2076 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2078 [52813]: https://github.com/rust-lang/rust/pull/52813/
2079 [53218]: https://github.com/rust-lang/rust/pull/53218/
2080 [53555]: https://github.com/rust-lang/rust/issues/53555/
2081 [54057]: https://github.com/rust-lang/rust/pull/54057/
2082 [54240]: https://github.com/rust-lang/rust/pull/54240/
2083 [54430]: https://github.com/rust-lang/rust/pull/54430/
2084 [54451]: https://github.com/rust-lang/rust/pull/54451/
2085 [54497]: https://github.com/rust-lang/rust/pull/54497/
2086 [54778]: https://github.com/rust-lang/rust/pull/54778/
2087 [54835]: https://github.com/rust-lang/rust/pull/54835/
2088 [54870]: https://github.com/rust-lang/rust/pull/54870/
2089 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2090 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2091 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2092 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2093 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2094 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2095 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2096 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2097 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2098 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2099 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2100 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2101 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2102 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2104 Version 1.30.1 (2018-11-08)
2105 ===========================
2107 - [Fixed overflow ICE in rustdoc][54199]
2108 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2110 [54199]: https://github.com/rust-lang/rust/pull/54199
2111 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2113 Version 1.30.0 (2018-10-25)
2114 ==========================
2118 - [Procedural macros are now available.][52081] These kinds of macros allow for
2119 more powerful code generation. There is a [new chapter available][proc-macros]
2120 in the Rust Programming Language book that goes further in depth.
2121 - [You can now use keywords as identifiers using the raw identifiers
2122 syntax (`r#`),][53236] e.g. `let r#for = true;`
2123 - [Using anonymous parameters in traits is now deprecated with a warning and
2124 will be a hard error in the 2018 edition.][53272]
2125 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2126 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2127 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2128 Previously, using a external crate in a module without a use statement
2129 required `let json = ::serde_json::from_str(foo);` but can now be written
2130 as `let json = serde_json::from_str(foo);`.
2131 - [You can now apply the `#[used]` attribute to static items to prevent the
2132 compiler from optimising them away, even if they appear to be unused,][51363]
2133 e.g. `#[used] static FOO: u32 = 1;`
2134 - [You can now import and reexport macros from other crates with the `use`
2135 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2136 the root module of the crate. If your macro relies on calling other local
2137 macros, it is recommended to export with the
2138 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2140 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2141 using the `vis` specifier.][53370]
2142 - [Non-macro attributes now allow all forms of literals, not just
2143 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2144 write `#[attr(true)]`.
2145 - [You can now specify a function to handle a panic in the Rust runtime with the
2146 `#[panic_handler]` attribute.][51366]
2150 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2151 - [Added the `aarch64-unknown-netbsd` target][53165]
2155 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2159 - [`Ipv4Addr::BROADCAST`]
2160 - [`Ipv4Addr::LOCALHOST`]
2161 - [`Ipv4Addr::UNSPECIFIED`]
2162 - [`Ipv6Addr::LOCALHOST`]
2163 - [`Ipv6Addr::UNSPECIFIED`]
2164 - [`Iterator::find_map`]
2166 The following methods are replacement methods for `trim_left`, `trim_right`,
2167 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2169 - [`str::trim_end_matches`]
2171 - [`str::trim_start_matches`]
2172 - [`str::trim_start`]
2176 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2177 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2178 equivalent to calling `rustdoc --error-format=json`.
2179 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2183 - [`rustdoc` allows you to specify what edition to treat your code as with the
2184 `--edition` option.][54057]
2185 - [`rustdoc` now has the `--color` (specify whether to output color) and
2186 `--error-format` (specify error format, e.g. `json`) options.][53003]
2187 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2188 debug symbols.][53774]
2189 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2190 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2192 [50911]: https://github.com/rust-lang/rust/pull/50911/
2193 [51363]: https://github.com/rust-lang/rust/pull/51363/
2194 [51366]: https://github.com/rust-lang/rust/pull/51366/
2195 [52081]: https://github.com/rust-lang/rust/pull/52081/
2196 [53003]: https://github.com/rust-lang/rust/pull/53003/
2197 [53033]: https://github.com/rust-lang/rust/pull/53033/
2198 [53044]: https://github.com/rust-lang/rust/pull/53044/
2199 [53165]: https://github.com/rust-lang/rust/pull/53165/
2200 [53213]: https://github.com/rust-lang/rust/pull/53213/
2201 [53236]: https://github.com/rust-lang/rust/pull/53236/
2202 [53272]: https://github.com/rust-lang/rust/pull/53272/
2203 [53370]: https://github.com/rust-lang/rust/pull/53370/
2204 [53459]: https://github.com/rust-lang/rust/pull/53459/
2205 [53774]: https://github.com/rust-lang/rust/pull/53774/
2206 [53822]: https://github.com/rust-lang/rust/pull/53822/
2207 [54057]: https://github.com/rust-lang/rust/pull/54057/
2208 [54146]: https://github.com/rust-lang/rust/pull/54146/
2209 [54404]: https://github.com/rust-lang/rust/pull/54404/
2210 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2211 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2212 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2213 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2215 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2216 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2217 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2218 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2219 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2220 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2221 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2222 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2223 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2224 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2227 Version 1.29.2 (2018-10-11)
2228 ===========================
2230 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2231 - The `rls-preview` component on the windows-gnu targets has been restored.
2233 [54639]: https://github.com/rust-lang/rust/pull/54639
2236 Version 1.29.1 (2018-09-25)
2237 ===========================
2242 - The standard library's `str::repeat` function contained an out of bounds write
2243 caused by an integer overflow. This has been fixed by deterministically
2244 panicking when an overflow happens.
2246 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2250 Version 1.29.0 (2018-09-13)
2251 ==========================
2255 - [Bumped minimum LLVM version to 5.0.][51899]
2256 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2257 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2261 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2262 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2263 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2264 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2266 - [`Cell<T>` now allows `T` to be unsized.][50494]
2267 - [`SocketAddr` is now stable on Redox.][52656]
2272 - [`Iterator::flatten`]
2277 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2278 `--locked` to disable this behavior.
2279 - [`cargo-install` will now allow you to cross compile an install
2280 using `--target`.][cargo/5614]
2281 - [Added the `cargo-fix` subcommand to automatically move project code from
2282 2015 edition to 2018.][cargo/5723]
2283 - [`cargo doc` can now optionally document private types using the
2284 `--document-private-items` flag.][cargo/5543]
2288 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2289 the specified level to that level.][52354] For example `--cap-lints warn`
2290 will demote `deny` and `forbid` lints to `warn`.
2291 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2292 fails and `101` if there is a panic.][52197]
2293 - [A preview of clippy has been made available through rustup.][51122]
2294 You can install the preview with `rustup component add clippy-preview`.
2298 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2299 Use `str::get_unchecked(begin..end)` instead.
2300 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2301 Consider using the `home_dir` function from
2302 https://crates.io/crates/dirs instead.
2303 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2304 - [`cfg` attributes and `--cfg` command line flags are now more
2305 strictly validated.][53893]
2307 [53893]: https://github.com/rust-lang/rust/pull/53893/
2308 [52861]: https://github.com/rust-lang/rust/pull/52861/
2309 [52656]: https://github.com/rust-lang/rust/pull/52656/
2310 [52239]: https://github.com/rust-lang/rust/pull/52239/
2311 [52330]: https://github.com/rust-lang/rust/pull/52330/
2312 [52354]: https://github.com/rust-lang/rust/pull/52354/
2313 [52402]: https://github.com/rust-lang/rust/pull/52402/
2314 [52103]: https://github.com/rust-lang/rust/pull/52103/
2315 [52197]: https://github.com/rust-lang/rust/pull/52197/
2316 [51807]: https://github.com/rust-lang/rust/pull/51807/
2317 [51899]: https://github.com/rust-lang/rust/pull/51899/
2318 [51912]: https://github.com/rust-lang/rust/pull/51912/
2319 [51511]: https://github.com/rust-lang/rust/pull/51511/
2320 [51619]: https://github.com/rust-lang/rust/pull/51619/
2321 [51656]: https://github.com/rust-lang/rust/pull/51656/
2322 [51178]: https://github.com/rust-lang/rust/pull/51178/
2323 [51122]: https://github.com/rust-lang/rust/pull/51122
2324 [50494]: https://github.com/rust-lang/rust/pull/50494/
2325 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2326 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2327 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2328 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2329 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2330 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2331 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2334 Version 1.28.0 (2018-08-02)
2335 ===========================
2339 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2340 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2341 the inner type across Foreign Function Interface (FFI) boundaries.
2342 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2343 and can now be used as identifiers.][51196]
2344 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2345 stable.][51241] This will allow users to specify a global allocator for
2347 - [Unit test functions marked with the `#[test]` attribute can now return
2348 `Result<(), E: Debug>` in addition to `()`.][51298]
2349 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2350 allows macros to easily target lifetimes.
2354 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2355 prioritise making smaller binary sizes. `z` is the same as `s` with the
2356 exception that it does not vectorise loops, which typically results in an even
2358 - [The short error format is now stable.][49546] Specified with
2359 `--error-format=short` this option will provide a more compressed output of
2360 rust error messages.
2361 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2362 - [Reduced the number of allocations in the macro parser.][50855] This can
2363 improve compile times of macro heavy crates on average by 5%.
2367 - [Implemented `Default` for `&mut str`.][51306]
2368 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2369 - [Implemented `Extend` for `()`.][50234]
2370 - [The `Debug` implementation of `time::Duration` should now be more easily
2371 human readable.][50364] Previously a `Duration` of one second would printed as
2372 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2373 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2374 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2375 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2376 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2377 for `PathBuf`.][50170]
2378 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2379 and `Wrapping<i128>`.][50465]
2380 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2381 possible.][51050] This can provide up to a 40% speed increase.
2382 - [Improved error messages when using `format!`.][50610]
2386 - [`Iterator::step_by`]
2387 - [`Path::ancestors`]
2388 - [`SystemTime::UNIX_EPOCH`]
2389 - [`alloc::GlobalAlloc`]
2391 - [`alloc::LayoutErr`]
2394 - [`alloc::alloc_zeroed`]
2395 - [`alloc::dealloc`]
2396 - [`alloc::realloc`]
2397 - [`alloc::handle_alloc_error`]
2398 - [`btree_map::Entry::or_default`]
2399 - [`fmt::Alignment`]
2400 - [`hash_map::Entry::or_default`]
2401 - [`iter::repeat_with`]
2402 - [`num::NonZeroUsize`]
2403 - [`num::NonZeroU128`]
2404 - [`num::NonZeroU16`]
2405 - [`num::NonZeroU32`]
2406 - [`num::NonZeroU64`]
2407 - [`num::NonZeroU8`]
2408 - [`ops::RangeBounds`]
2409 - [`slice::SliceIndex`]
2410 - [`slice::from_mut`]
2411 - [`slice::from_ref`]
2412 - [`{Any + Send + Sync}::downcast_mut`]
2413 - [`{Any + Send + Sync}::downcast_ref`]
2414 - [`{Any + Send + Sync}::is`]
2418 - [Cargo will now no longer allow you to publish crates with build scripts that
2419 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2420 considered to be immutable.
2424 - [The `suggestion_applicability` field in `rustc`'s json output is now
2425 stable.][50486] This will allow dev tools to check whether a code suggestion
2426 would apply to them.
2430 - [Rust will consider trait objects with duplicated constraints to be the same
2431 type as without the duplicated constraint.][51276] For example the below code will
2432 now fail to compile.
2437 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2440 impl Trait + Send + Send {
2441 fn test(&self) { println!("two"); }
2445 [49546]: https://github.com/rust-lang/rust/pull/49546/
2446 [50143]: https://github.com/rust-lang/rust/pull/50143/
2447 [50170]: https://github.com/rust-lang/rust/pull/50170/
2448 [50234]: https://github.com/rust-lang/rust/pull/50234/
2449 [50265]: https://github.com/rust-lang/rust/pull/50265/
2450 [50364]: https://github.com/rust-lang/rust/pull/50364/
2451 [50385]: https://github.com/rust-lang/rust/pull/50385/
2452 [50465]: https://github.com/rust-lang/rust/pull/50465/
2453 [50486]: https://github.com/rust-lang/rust/pull/50486/
2454 [50554]: https://github.com/rust-lang/rust/pull/50554/
2455 [50610]: https://github.com/rust-lang/rust/pull/50610/
2456 [50855]: https://github.com/rust-lang/rust/pull/50855/
2457 [51050]: https://github.com/rust-lang/rust/pull/51050/
2458 [51196]: https://github.com/rust-lang/rust/pull/51196/
2459 [51200]: https://github.com/rust-lang/rust/pull/51200/
2460 [51241]: https://github.com/rust-lang/rust/pull/51241/
2461 [51276]: https://github.com/rust-lang/rust/pull/51276/
2462 [51298]: https://github.com/rust-lang/rust/pull/51298/
2463 [51306]: https://github.com/rust-lang/rust/pull/51306/
2464 [51562]: https://github.com/rust-lang/rust/pull/51562/
2465 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2466 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2467 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2468 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2469 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2470 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2471 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2472 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2473 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2474 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2475 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2476 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2477 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2478 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2479 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2480 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2481 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2482 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2483 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2484 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2485 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2486 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2487 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2488 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2489 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2490 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2491 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2492 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2493 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2494 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2496 Version 1.27.2 (2018-07-20)
2497 ===========================
2502 - The borrow checker was fixed to avoid potential unsoundness when using
2503 match ergonomics: [#52213][52213].
2505 [52213]: https://github.com/rust-lang/rust/issues/52213
2507 Version 1.27.1 (2018-07-10)
2508 ===========================
2513 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2514 when running, which enabled executing code as some other user on a
2515 given machine. This release fixes that vulnerability; you can read
2516 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2518 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2523 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2524 match ergonomics: [#51415][51415], [#49534][49534].
2526 [51415]: https://github.com/rust-lang/rust/issues/51415
2527 [49534]: https://github.com/rust-lang/rust/issues/49534
2528 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2529 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2531 Version 1.27.0 (2018-06-21)
2532 ==========================
2536 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2537 be used as an identifier.
2538 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2539 bare `Trait` syntax, and should make it clearer when being used in tandem with
2540 `impl Trait` because it is equivalent to the following syntax:
2541 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2542 `Box<Trait> == Box<dyn Trait>`.
2543 - [Attributes on generic parameters such as types and lifetimes are
2544 now stable.][48851] e.g.
2545 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2546 - [The `#[must_use]` attribute can now also be used on functions as well as
2547 types.][48925] It provides a lint that by default warns users when the
2548 value returned by a function has not been used.
2552 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2556 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2557 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2558 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2559 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2560 the `cfg` attribute.
2561 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2562 std are now available in core.][49896]
2563 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2565 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2566 that the operation isn't done in place.
2567 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2568 the `#[must_use]` attribute][49533] to warn about unused potentially
2569 expensive allocations.
2573 - [`DoubleEndedIterator::rfind`]
2574 - [`DoubleEndedIterator::rfold`]
2575 - [`DoubleEndedIterator::try_rfold`]
2576 - [`Duration::from_micros`]
2577 - [`Duration::from_nanos`]
2578 - [`Duration::subsec_micros`]
2579 - [`Duration::subsec_millis`]
2580 - [`HashMap::remove_entry`]
2581 - [`Iterator::try_fold`]
2582 - [`Iterator::try_for_each`]
2584 - [`Option::filter`]
2585 - [`String::replace_range`]
2586 - [`Take::set_limit`]
2587 - [`hint::unreachable_unchecked`]
2588 - [`os::unix::process::parent_id`]
2589 - [`ptr::swap_nonoverlapping`]
2590 - [`slice::rsplit_mut`]
2592 - [`slice::swap_with_slice`]
2596 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2597 `readme`, and `repository` fields.][cargo/5386]
2598 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2599 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2600 a different directory than `target` for placing compilation artifacts.
2601 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2602 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2603 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2604 where cargo would infer a binary, Cargo will produce a warning. You can
2605 disable this feature ahead of time by setting any of the following to false:
2606 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2607 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2608 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2612 - [Added “The Rustc book” into the official documentation.][49707]
2613 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2614 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2618 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2619 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2620 compile, `"".is_empty()` will still compile.
2621 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2622 will only print the inner type.][48553] E.g.
2623 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2624 not `AtomicBool(true)`.
2625 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2626 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2627 alignment should cover all use cases.
2628 - The `.description()` method on the `std::error::Error` trait
2629 [has been soft-deprecated][50163]. It is no longer required to implement it.
2631 [48553]: https://github.com/rust-lang/rust/pull/48553/
2632 [48851]: https://github.com/rust-lang/rust/pull/48851/
2633 [48925]: https://github.com/rust-lang/rust/pull/48925/
2634 [49533]: https://github.com/rust-lang/rust/pull/49533/
2635 [49623]: https://github.com/rust-lang/rust/pull/49623/
2636 [49630]: https://github.com/rust-lang/rust/pull/49630/
2637 [49664]: https://github.com/rust-lang/rust/pull/49664/
2638 [49699]: https://github.com/rust-lang/rust/pull/49699/
2639 [49707]: https://github.com/rust-lang/rust/pull/49707/
2640 [49719]: https://github.com/rust-lang/rust/pull/49719/
2641 [49896]: https://github.com/rust-lang/rust/pull/49896/
2642 [49968]: https://github.com/rust-lang/rust/pull/49968/
2643 [50163]: https://github.com/rust-lang/rust/pull/50163
2644 [50177]: https://github.com/rust-lang/rust/pull/50177/
2645 [50378]: https://github.com/rust-lang/rust/pull/50378/
2646 [50398]: https://github.com/rust-lang/rust/pull/50398/
2647 [50423]: https://github.com/rust-lang/rust/pull/50423/
2648 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2649 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2650 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2651 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2652 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2653 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2654 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2655 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2656 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2657 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2658 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2659 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2660 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2661 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2662 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2663 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2664 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2665 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2666 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2667 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2668 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2669 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2670 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2671 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2672 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2673 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2674 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2675 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2676 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2677 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2680 Version 1.26.2 (2018-06-05)
2681 ==========================
2686 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2688 [51117]: https://github.com/rust-lang/rust/issues/51117
2691 Version 1.26.1 (2018-05-29)
2692 ==========================
2697 - [RLS now works on Windows.][50646]
2698 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2704 - [`fn main() -> impl Trait` no longer works for non-Termination
2706 This reverts an accidental stabilization.
2707 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2708 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2710 [50646]: https://github.com/rust-lang/rust/issues/50646
2711 [50656]: https://github.com/rust-lang/rust/pull/50656
2712 [50812]: https://github.com/rust-lang/rust/pull/50812
2713 [50950]: https://github.com/rust-lang/rust/issues/50950
2714 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2716 Version 1.26.0 (2018-05-10)
2717 ==========================
2721 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2722 implement either or both traits.][49299]
2723 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2724 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2725 lifetime can be elided.][49458]
2726 - [`impl Trait` is now stable allowing you to have abstract types in returns
2727 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2728 `fn open(path: impl AsRef<Path>)`.
2729 - [Pattern matching will now automatically apply dereferences.][49394]
2730 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2731 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2732 - [A lot of operations are now available in a const context.][46882] E.g. You
2733 can now index into constant arrays, reference and dereference into constants,
2734 and use tuple struct constructors.
2735 - [Fixed entry slice patterns are now stable.][48516] E.g.
2737 let points = [1, 2, 3, 4];
2739 [1, 2, 3, 4] => println!("All points were sequential."),
2740 _ => println!("Not all points were sequential."),
2747 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2748 - [Fixed exponential projection complexity on nested types.][48296]
2749 This can provide up to a ~12% reduction in compile times for certain crates.
2750 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2751 to remap path prefixes outputted by the compiler.
2752 - [Added `powerpc-unknown-netbsd` target.][48281]
2756 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2757 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2758 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2759 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2760 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2761 - [`ascii::escape_default` is now available in libcore.][48735]
2762 - [Trailing commas are now supported in std and core macros.][48056]
2763 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2764 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2769 - [`*const T::copy_to_nonoverlapping`]
2770 - [`*const T::copy_to`]
2771 - [`*const T::read_unaligned`]
2772 - [`*const T::read_volatile`]
2773 - [`*const T::read`]
2775 - [`*const T::wrapping_add`]
2776 - [`*const T::wrapping_sub`]
2778 - [`*mut T::copy_to_nonoverlapping`]
2779 - [`*mut T::copy_to`]
2780 - [`*mut T::read_unaligned`]
2781 - [`*mut T::read_volatile`]
2783 - [`*mut T::replace`]
2786 - [`*mut T::wrapping_add`]
2787 - [`*mut T::wrapping_sub`]
2788 - [`*mut T::write_bytes`]
2789 - [`*mut T::write_unaligned`]
2790 - [`*mut T::write_volatile`]
2793 - [`FromUtf8Error::as_bytes`]
2794 - [`LocalKey::try_with`]
2795 - [`Option::cloned`]
2796 - [`btree_map::Entry::and_modify`]
2797 - [`fs::read_to_string`]
2800 - [`hash_map::Entry::and_modify`]
2801 - [`iter::FusedIterator`]
2802 - [`ops::RangeInclusive`]
2803 - [`ops::RangeToInclusive`]
2805 - [`slice::rotate_left`]
2806 - [`slice::rotate_right`]
2807 - [`String::retain`]
2812 - [Cargo will now output path to custom commands when `-v` is
2813 passed with `--list`][cargo/5041]
2814 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2818 - [The second edition of "The Rust Programming Language" book is now recommended
2819 over the first.][48404]
2824 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2825 syntax is now invalid.
2827 use std::ops::Fn as dyn;
2828 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2830 - [The result of dereferences are no longer promoted to `'static`.][47408]
2834 const PAIR: &(i32, i32) = &(0, 1);
2835 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2838 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2839 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2841 - [Removed hoedown from rustdoc.][48274]
2842 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2844 [46882]: https://github.com/rust-lang/rust/pull/46882
2845 [47379]: https://github.com/rust-lang/rust/pull/47379
2846 [47408]: https://github.com/rust-lang/rust/pull/47408
2847 [47813]: https://github.com/rust-lang/rust/pull/47813
2848 [48056]: https://github.com/rust-lang/rust/pull/48056
2849 [48125]: https://github.com/rust-lang/rust/pull/48125
2850 [48166]: https://github.com/rust-lang/rust/pull/48166
2851 [48235]: https://github.com/rust-lang/rust/pull/48235
2852 [48274]: https://github.com/rust-lang/rust/pull/48274
2853 [48281]: https://github.com/rust-lang/rust/pull/48281
2854 [48296]: https://github.com/rust-lang/rust/pull/48296
2855 [48326]: https://github.com/rust-lang/rust/pull/48326
2856 [48359]: https://github.com/rust-lang/rust/pull/48359
2857 [48404]: https://github.com/rust-lang/rust/pull/48404
2858 [48481]: https://github.com/rust-lang/rust/pull/48481
2859 [48516]: https://github.com/rust-lang/rust/pull/48516
2860 [48628]: https://github.com/rust-lang/rust/pull/48628
2861 [48629]: https://github.com/rust-lang/rust/pull/48629
2862 [48657]: https://github.com/rust-lang/rust/pull/48657
2863 [48735]: https://github.com/rust-lang/rust/pull/48735
2864 [48978]: https://github.com/rust-lang/rust/pull/48978
2865 [49101]: https://github.com/rust-lang/rust/pull/49101
2866 [49109]: https://github.com/rust-lang/rust/pull/49109
2867 [49121]: https://github.com/rust-lang/rust/pull/49121
2868 [49162]: https://github.com/rust-lang/rust/pull/49162
2869 [49184]: https://github.com/rust-lang/rust/pull/49184
2870 [49234]: https://github.com/rust-lang/rust/pull/49234
2871 [49255]: https://github.com/rust-lang/rust/pull/49255
2872 [49299]: https://github.com/rust-lang/rust/pull/49299
2873 [49305]: https://github.com/rust-lang/rust/pull/49305
2874 [49394]: https://github.com/rust-lang/rust/pull/49394
2875 [49458]: https://github.com/rust-lang/rust/pull/49458
2876 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2877 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2878 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2879 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2880 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2881 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2882 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2883 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2884 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2885 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2886 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2887 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2888 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2889 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2890 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2891 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2892 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2893 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2894 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2895 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2896 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2897 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2898 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2899 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2900 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2901 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2902 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2903 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2904 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2905 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2906 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2907 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2908 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2909 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2910 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2911 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2912 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2913 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2914 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2915 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2916 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2917 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2920 Version 1.25.0 (2018-03-29)
2921 ==========================
2925 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2926 - [You can now use nested groups of imports.][47948]
2927 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2928 - [You can now have `|` at the start of a match arm.][47947] e.g.
2930 enum Foo { A, B, C }
2936 | Foo::B => println!("AB"),
2937 | Foo::C => println!("C"),
2944 - [Upgraded to LLVM 6.][47828]
2945 - [Added `-C lto=val` option.][47521]
2946 - [Added `i586-unknown-linux-musl` target][47282]
2950 - [Impl Send for `process::Command` on Unix.][47760]
2951 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2952 - [`UnsafeCell::into_inner` is now safe.][47204]
2953 - [Implement libstd for CloudABI.][47268]
2954 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2955 - [Implement `AsRef<Path>` for Component][46985]
2956 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2957 - [Moved `Duration` to libcore.][46666]
2961 - [`Location::column`]
2964 The following functions can now be used in a constant expression.
2965 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2966 - [`Duration::new`][47300]
2967 - [`Duration::from_secs`][47300]
2968 - [`Duration::from_millis`][47300]
2972 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2973 - [`cargo new` now defaults to creating a binary crate, instead of a
2974 library crate.][cargo/5029]
2978 - [Rust by example is now shipped with new releases][46196]
2982 - [Deprecated `net::lookup_host`.][47510]
2983 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2984 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2985 around indexing operations (see [#47349][47349]). This has been fixed (which also
2986 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2987 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2989 [33903]: https://github.com/rust-lang/rust/pull/33903
2990 [47947]: https://github.com/rust-lang/rust/pull/47947
2991 [47948]: https://github.com/rust-lang/rust/pull/47948
2992 [47760]: https://github.com/rust-lang/rust/pull/47760
2993 [47790]: https://github.com/rust-lang/rust/pull/47790
2994 [47828]: https://github.com/rust-lang/rust/pull/47828
2995 [47398]: https://github.com/rust-lang/rust/pull/47398
2996 [47510]: https://github.com/rust-lang/rust/pull/47510
2997 [47521]: https://github.com/rust-lang/rust/pull/47521
2998 [47204]: https://github.com/rust-lang/rust/pull/47204
2999 [47251]: https://github.com/rust-lang/rust/pull/47251
3000 [47268]: https://github.com/rust-lang/rust/pull/47268
3001 [47282]: https://github.com/rust-lang/rust/pull/47282
3002 [47300]: https://github.com/rust-lang/rust/pull/47300
3003 [47349]: https://github.com/rust-lang/rust/pull/47349
3004 [46931]: https://github.com/rust-lang/rust/pull/46931
3005 [46985]: https://github.com/rust-lang/rust/pull/46985
3006 [47006]: https://github.com/rust-lang/rust/pull/47006
3007 [46830]: https://github.com/rust-lang/rust/pull/46830
3008 [46095]: https://github.com/rust-lang/rust/pull/46095
3009 [46666]: https://github.com/rust-lang/rust/pull/46666
3010 [46196]: https://github.com/rust-lang/rust/pull/46196
3011 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3012 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3013 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3014 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3015 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3018 Version 1.24.1 (2018-03-01)
3019 ==========================
3021 - [Do not abort when unwinding through FFI][48251]
3022 - [Emit UTF-16 files for linker arguments on Windows][48318]
3023 - [Make the error index generator work again][48308]
3024 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3026 [48251]: https://github.com/rust-lang/rust/issues/48251
3027 [48308]: https://github.com/rust-lang/rust/issues/48308
3028 [48318]: https://github.com/rust-lang/rust/issues/48318
3029 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3032 Version 1.24.0 (2018-02-15)
3033 ==========================
3037 - [External `sysv64` ffi is now available.][46528]
3038 eg. `extern "sysv64" fn foo () {}`
3042 - [rustc now uses 16 codegen units by default for release builds.][46910]
3043 For the fastest builds, utilize `codegen-units=1`.
3044 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3045 - [Add `aarch64-unknown-openbsd` support][46760]
3049 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3050 improvement in performance in the majority of cases.
3051 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3052 with Windows.][46798]
3053 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3054 - [impl `From<bool>` for `AtomicBool`][46293]
3055 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3056 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3057 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3058 - [float::from_bits now just uses transmute.][46012] This provides
3059 some optimisations from LLVM.
3060 - [Copied `AsciiExt` methods onto `char`][46077]
3061 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3062 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3063 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3064 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3068 - [`RefCell::replace`]
3070 - [`atomic::spin_loop_hint`]
3072 The following functions can now be used in a constant expression.
3073 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3075 - [`AtomicBool::new`][46287]
3076 - [`AtomicUsize::new`][46287]
3077 - [`AtomicIsize::new`][46287]
3078 - [`AtomicPtr::new`][46287]
3079 - [`Cell::new`][46287]
3080 - [`{integer}::min_value`][46287]
3081 - [`{integer}::max_value`][46287]
3082 - [`mem::size_of`][46287]
3083 - [`mem::align_of`][46287]
3084 - [`ptr::null`][46287]
3085 - [`ptr::null_mut`][46287]
3086 - [`RefCell::new`][46287]
3087 - [`UnsafeCell::new`][46287]
3091 - [Added a `workspace.default-members` config that
3092 overrides implied `--all` in virtual workspaces.][cargo/4743]
3093 - [Enable incremental by default on development builds.][cargo/4817] Also added
3094 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3095 per-project or global basis respectively.
3102 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3103 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3104 in accordance with IETF RFC 4291 §2.2.
3105 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3106 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3107 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3108 - [Leading zeros in tuple struct members is now an error][47084]
3109 - [`column!()` macro is one-based instead of zero-based][46977]
3110 - [`fmt::Arguments` can no longer be shared across threads][45198]
3111 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3112 - [Cargo sets a different working directory for the compiler][cargo/4788]
3114 [44884]: https://github.com/rust-lang/rust/pull/44884
3115 [45198]: https://github.com/rust-lang/rust/pull/45198
3116 [45506]: https://github.com/rust-lang/rust/pull/45506
3117 [45904]: https://github.com/rust-lang/rust/pull/45904
3118 [45990]: https://github.com/rust-lang/rust/pull/45990
3119 [46012]: https://github.com/rust-lang/rust/pull/46012
3120 [46077]: https://github.com/rust-lang/rust/pull/46077
3121 [46094]: https://github.com/rust-lang/rust/pull/46094
3122 [46284]: https://github.com/rust-lang/rust/pull/46284
3123 [46287]: https://github.com/rust-lang/rust/pull/46287
3124 [46293]: https://github.com/rust-lang/rust/pull/46293
3125 [46528]: https://github.com/rust-lang/rust/pull/46528
3126 [46671]: https://github.com/rust-lang/rust/pull/46671
3127 [46713]: https://github.com/rust-lang/rust/pull/46713
3128 [46735]: https://github.com/rust-lang/rust/pull/46735
3129 [46749]: https://github.com/rust-lang/rust/pull/46749
3130 [46760]: https://github.com/rust-lang/rust/pull/46760
3131 [46798]: https://github.com/rust-lang/rust/pull/46798
3132 [46828]: https://github.com/rust-lang/rust/pull/46828
3133 [46831]: https://github.com/rust-lang/rust/pull/46831
3134 [46833]: https://github.com/rust-lang/rust/pull/46833
3135 [46910]: https://github.com/rust-lang/rust/pull/46910
3136 [46977]: https://github.com/rust-lang/rust/pull/46977
3137 [47018]: https://github.com/rust-lang/rust/pull/47018
3138 [47080]: https://github.com/rust-lang/rust/pull/47080
3139 [47084]: https://github.com/rust-lang/rust/pull/47084
3140 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3141 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3142 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3143 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3144 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3145 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3148 Version 1.23.0 (2018-01-04)
3149 ==========================
3153 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3154 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3155 Which should fix some confusing errors in some operations.
3159 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3160 undefined behavior.][45920]
3161 - [rustc now suggests renaming import if names clash.][45660]
3162 - [Display errors/warnings correctly when there are zero-width or
3163 wide characters.][45711]
3164 - [rustc now avoids unnecessary copies of arguments that are
3165 simple bindings][45380] This should improve memory usage on average by 5-10%.
3166 - [Updated musl used to build musl rustc to 1.1.17][45393]
3170 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3171 - [Implement Hash for raw pointers to unsized types][45483]
3172 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3173 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3174 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3175 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3176 and `<*mut T>::as_mut`][44932]
3177 - [Optimized `Thread::{park, unpark}` implementation][45524]
3178 - [Improved `SliceExt::binary_search` performance.][45333]
3179 - [impl `FromIterator<()>` for `()`][45379]
3180 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3188 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3189 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3190 - [Added unit test checking to `cargo check`][cargo/4592]
3191 - [Cargo now lets you install a specific version
3192 using `cargo install --version`][cargo/4637]
3196 - [Releases now ship with the Cargo book documentation.][45692]
3197 - [rustdoc now prints rendering warnings on every run.][45324]
3201 - [Changes have been made to type equality to make it more correct,
3202 in rare cases this could break some code.][45853] [Tracking issue for
3203 further information][45852]
3204 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3205 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3206 Android 9, the minimum supported version is Android 14.
3207 - [Bumped the minimum LLVM to 3.9][45326]
3209 [44042]: https://github.com/rust-lang/rust/pull/44042
3210 [44932]: https://github.com/rust-lang/rust/pull/44932
3211 [45267]: https://github.com/rust-lang/rust/pull/45267
3212 [45324]: https://github.com/rust-lang/rust/pull/45324
3213 [45326]: https://github.com/rust-lang/rust/pull/45326
3214 [45333]: https://github.com/rust-lang/rust/pull/45333
3215 [45379]: https://github.com/rust-lang/rust/pull/45379
3216 [45380]: https://github.com/rust-lang/rust/pull/45380
3217 [45393]: https://github.com/rust-lang/rust/pull/45393
3218 [45435]: https://github.com/rust-lang/rust/pull/45435
3219 [45483]: https://github.com/rust-lang/rust/pull/45483
3220 [45524]: https://github.com/rust-lang/rust/pull/45524
3221 [45571]: https://github.com/rust-lang/rust/pull/45571
3222 [45580]: https://github.com/rust-lang/rust/pull/45580
3223 [45610]: https://github.com/rust-lang/rust/pull/45610
3224 [45660]: https://github.com/rust-lang/rust/pull/45660
3225 [45692]: https://github.com/rust-lang/rust/pull/45692
3226 [45711]: https://github.com/rust-lang/rust/pull/45711
3227 [45772]: https://github.com/rust-lang/rust/pull/45772
3228 [45852]: https://github.com/rust-lang/rust/issues/45852
3229 [45853]: https://github.com/rust-lang/rust/pull/45853
3230 [45887]: https://github.com/rust-lang/rust/pull/45887
3231 [45920]: https://github.com/rust-lang/rust/pull/45920
3232 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3233 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3234 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3237 Version 1.22.1 (2017-11-22)
3238 ==========================
3240 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3242 [46183]: https://github.com/rust-lang/rust/pull/46183
3244 Version 1.22.0 (2017-11-22)
3245 ==========================
3249 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3250 - [Now accepts underscores in unicode escapes][43716]
3251 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3252 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3256 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3257 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3258 This should decrease compile times for debug builds.
3259 - [strict memory alignment now enabled on ARMv6][45094]
3260 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3264 - [Allow atomic operations up to 32 bits
3265 on `armv5te_unknown_linux_gnueabi`][44978]
3266 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3267 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3268 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3269 - [Properly detect overflow in `Instant += Duration`.][44220]
3270 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3271 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3272 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3279 - [Cargo will now build multi file examples in subdirectories of the `examples`
3280 folder that have a `main.rs` file.][cargo/4496]
3281 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3282 the old format will continue to work and can be updated with `cargo update`.
3283 - [Now supports vendoring git repositories][cargo/3992]
3287 - [`libbacktrace` is now available on Apple platforms.][44251]
3288 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3289 This now lets you specify that a given code example will fail to compile.
3293 - [The minimum Android version that rustc can build for has been bumped
3294 to `4.0` from `2.3`][45656]
3295 - [Allowing `T op= &T` for numeric types has broken some type
3296 inference cases][45480]
3299 [42526]: https://github.com/rust-lang/rust/pull/42526
3300 [43017]: https://github.com/rust-lang/rust/pull/43017
3301 [43716]: https://github.com/rust-lang/rust/pull/43716
3302 [43949]: https://github.com/rust-lang/rust/pull/43949
3303 [44015]: https://github.com/rust-lang/rust/pull/44015
3304 [44220]: https://github.com/rust-lang/rust/pull/44220
3305 [44251]: https://github.com/rust-lang/rust/pull/44251
3306 [44287]: https://github.com/rust-lang/rust/pull/44287
3307 [44303]: https://github.com/rust-lang/rust/pull/44303
3308 [44456]: https://github.com/rust-lang/rust/pull/44456
3309 [44466]: https://github.com/rust-lang/rust/pull/44466
3310 [44895]: https://github.com/rust-lang/rust/pull/44895
3311 [44966]: https://github.com/rust-lang/rust/pull/44966
3312 [44978]: https://github.com/rust-lang/rust/pull/44978
3313 [45041]: https://github.com/rust-lang/rust/pull/45041
3314 [45064]: https://github.com/rust-lang/rust/pull/45064
3315 [45075]: https://github.com/rust-lang/rust/pull/45075
3316 [45094]: https://github.com/rust-lang/rust/pull/45094
3317 [45095]: https://github.com/rust-lang/rust/pull/45095
3318 [45480]: https://github.com/rust-lang/rust/issues/45480
3319 [45656]: https://github.com/rust-lang/rust/pull/45656
3320 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3321 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3322 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3329 Version 1.21.0 (2017-10-12)
3330 ==========================
3334 - [You can now use static references for literals.][43838]
3338 let x: &'static u32 = &0;
3341 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3344 my_macro!(Vec<i32>::new); // Always worked
3345 my_macro!(Vec::<i32>::new); // Now works
3350 - [Upgraded jemalloc to 4.5.0][43911]
3351 - [Enabled unwinding panics on Redox][43917]
3352 - [Now runs LLVM in parallel during translation phase.][43506]
3353 This should reduce peak memory usage.
3357 - [Generate builtin impls for `Clone` for all arrays and tuples that
3358 are `T: Clone`][43690]
3359 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3360 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3361 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3366 [`std::mem::discriminant`]
3370 - [You can now call `cargo install` with multiple package names][cargo/4216]
3371 - [Cargo commands inside a virtual workspace will now implicitly
3372 pass `--all`][cargo/4335]
3373 - [Added a `[patch]` section to `Cargo.toml` to handle
3374 prepublication dependencies][cargo/4123] [RFC 1969]
3375 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3376 like patterns][cargo/4270]
3377 - [Added the `--all-targets` option][cargo/4400]
3378 - [Using required dependencies as a feature is now deprecated and emits
3379 a warning][cargo/4364]
3384 - [Cargo docs are moving][43916]
3385 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3386 - [The rustdoc book is now available][43863]
3387 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3388 - [Added a preview of RLS has been made available through rustup][44204]
3389 Install with `rustup component add rls-preview`
3390 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3391 Previously only showed `std::os::unix`.
3395 - [Changes in method matching against higher-ranked types][43880] This may cause
3396 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3397 - [rustc's JSON error output's byte position start at top of file.][42973]
3398 Was previously relative to the rustc's internal `CodeMap` struct which
3399 required the unstable library `libsyntax` to correctly use.
3400 - [`unused_results` lint no longer ignores booleans][43728]
3402 [42565]: https://github.com/rust-lang/rust/pull/42565
3403 [42973]: https://github.com/rust-lang/rust/pull/42973
3404 [43348]: https://github.com/rust-lang/rust/pull/43348
3405 [43459]: https://github.com/rust-lang/rust/pull/43459
3406 [43506]: https://github.com/rust-lang/rust/pull/43506
3407 [43540]: https://github.com/rust-lang/rust/pull/43540
3408 [43690]: https://github.com/rust-lang/rust/pull/43690
3409 [43728]: https://github.com/rust-lang/rust/pull/43728
3410 [43838]: https://github.com/rust-lang/rust/pull/43838
3411 [43863]: https://github.com/rust-lang/rust/pull/43863
3412 [43880]: https://github.com/rust-lang/rust/pull/43880
3413 [43911]: https://github.com/rust-lang/rust/pull/43911
3414 [43916]: https://github.com/rust-lang/rust/pull/43916
3415 [43917]: https://github.com/rust-lang/rust/pull/43917
3416 [44204]: https://github.com/rust-lang/rust/pull/44204
3417 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3418 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3419 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3420 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3421 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3422 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3423 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3424 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3425 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3427 Version 1.20.0 (2017-08-31)
3428 ===========================
3432 - [Associated constants are now stabilised.][42809]
3433 - [A lot of macro bugs are now fixed.][42913]
3438 - [Struct fields are now properly coerced to the expected field type.][42807]
3439 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3440 `wasm32-experimental-emscripten` target.
3441 - [Changed some of the error messages to be more helpful.][42033]
3442 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3444 - [rustc now reports the total number of errors on compilation failure][43015]
3445 previously this was only the number of errors in the pass that failed.
3446 - [Expansion in rustc has been sped up 29x.][42533]
3447 - [added `msp430-none-elf` target.][43099]
3448 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3450 - [Fixes backtraces on Redox][43228]
3451 - [rustc now identifies different versions of same crate when absolute paths of
3452 different types match in an error message.][42826]
3458 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3459 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3461 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3462 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3463 - [Impl `Clone` for `DefaultHasher`.][42799]
3464 - [Impl `Sync` for `SyncSender`.][42397]
3465 - [Impl `FromStr` for `char`][42271]
3466 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3468 - [allow messages in the `unimplemented!()` macro.][42155]
3469 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3470 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3471 - [Upgrade to Unicode 10.0.0][42999]
3472 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3473 - [Skip the main thread's manual stack guard on Linux][43072]
3474 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3475 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3477 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3482 - [`CStr::into_c_string`]
3483 - [`CString::as_c_str`]
3484 - [`CString::into_boxed_c_str`]
3485 - [`Chain::get_mut`]
3486 - [`Chain::get_ref`]
3487 - [`Chain::into_inner`]
3488 - [`Option::get_or_insert_with`]
3489 - [`Option::get_or_insert`]
3490 - [`OsStr::into_os_string`]
3491 - [`OsString::into_boxed_os_str`]
3494 - [`Utf8Error::error_len`]
3495 - [`char::EscapeDebug`]
3496 - [`char::escape_debug`]
3497 - [`compile_error!`]
3498 - [`f32::from_bits`]
3500 - [`f64::from_bits`]
3502 - [`mem::ManuallyDrop`]
3503 - [`slice::sort_unstable_by_key`]
3504 - [`slice::sort_unstable_by`]
3505 - [`slice::sort_unstable`]
3506 - [`str::from_boxed_utf8_unchecked`]
3507 - [`str::as_bytes_mut`]
3508 - [`str::as_bytes_mut`]
3509 - [`str::from_utf8_mut`]
3510 - [`str::from_utf8_unchecked_mut`]
3512 - [`str::get_unchecked_mut`]
3513 - [`str::get_unchecked`]
3515 - [`str::into_boxed_bytes`]
3520 - [Cargo API token location moved from `~/.cargo/config` to
3521 `~/.cargo/credentials`.][cargo/3978]
3522 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3523 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3524 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3525 - [You can now specify version of a binary when installed through
3526 `cargo install` using `--vers`.][cargo/4229]
3527 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3528 failure.][cargo/4248]
3529 - [Changed the convention around which file is the crate root.][cargo/4259]
3530 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3531 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3536 - [Functions with `'static` in their return types will now not be as usable as
3537 if they were using lifetime parameters instead.][42417]
3538 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3539 takes the sign of NaN into account where previously didn't.][42430]
3541 [42033]: https://github.com/rust-lang/rust/pull/42033
3542 [42155]: https://github.com/rust-lang/rust/pull/42155
3543 [42271]: https://github.com/rust-lang/rust/pull/42271
3544 [42397]: https://github.com/rust-lang/rust/pull/42397
3545 [42417]: https://github.com/rust-lang/rust/pull/42417
3546 [42430]: https://github.com/rust-lang/rust/pull/42430
3547 [42431]: https://github.com/rust-lang/rust/pull/42431
3548 [42533]: https://github.com/rust-lang/rust/pull/42533
3549 [42571]: https://github.com/rust-lang/rust/pull/42571
3550 [42613]: https://github.com/rust-lang/rust/pull/42613
3551 [42799]: https://github.com/rust-lang/rust/pull/42799
3552 [42807]: https://github.com/rust-lang/rust/pull/42807
3553 [42809]: https://github.com/rust-lang/rust/pull/42809
3554 [42822]: https://github.com/rust-lang/rust/pull/42822
3555 [42826]: https://github.com/rust-lang/rust/pull/42826
3556 [42854]: https://github.com/rust-lang/rust/pull/42854
3557 [42913]: https://github.com/rust-lang/rust/pull/42913
3558 [42999]: https://github.com/rust-lang/rust/pull/42999
3559 [43011]: https://github.com/rust-lang/rust/pull/43011
3560 [43015]: https://github.com/rust-lang/rust/pull/43015
3561 [43072]: https://github.com/rust-lang/rust/pull/43072
3562 [43077]: https://github.com/rust-lang/rust/pull/43077
3563 [43097]: https://github.com/rust-lang/rust/pull/43097
3564 [43099]: https://github.com/rust-lang/rust/pull/43099
3565 [43170]: https://github.com/rust-lang/rust/pull/43170
3566 [43178]: https://github.com/rust-lang/rust/pull/43178
3567 [43185]: https://github.com/rust-lang/rust/pull/43185
3568 [43228]: https://github.com/rust-lang/rust/pull/43228
3569 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3570 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3571 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3572 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3573 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3574 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3575 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3576 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3577 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3578 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3579 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3580 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3581 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3582 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3583 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3584 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3585 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3586 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3587 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3588 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3589 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3590 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3591 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3592 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3593 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3594 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3595 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3596 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3597 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3598 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3599 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3600 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3601 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3602 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3603 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3604 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3605 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3606 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3607 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3610 Version 1.19.0 (2017-07-20)
3611 ===========================
3616 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3617 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3618 - [Macro recursion limit increased to 1024 from 64.][41676]
3619 - [Added lint for detecting unused macros.][41907]
3620 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3621 For example: `let x = loop { break 7; };`
3622 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3623 contain `Copy` types and cannot have a `Drop` implementation.
3624 Example: `union Foo { bar: u8, baz: usize }`
3625 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3626 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3631 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3632 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3633 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3634 you should use `--target armv7-linux-androideabi`.
3635 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3636 - [Minor optimisation of string operations.][42037]
3637 - [Compiler error message is now `aborting due to previous error(s)` instead of
3638 `aborting due to N previous errors`][42150] This was previously inaccurate and
3639 would only count certain kinds of errors.
3640 - [The compiler now supports Visual Studio 2017][42225]
3641 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3642 - [Added a lot][42264] of [new error codes][42302]
3643 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3644 libraries with C Run-time Libraries(CRT) to be statically linked.
3645 - [Fixed various ARM codegen bugs][42740]
3650 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3651 `Extend<Cow<'a, str>>`][41449]
3652 - [`Vec` now implements `From<&mut [T]>`][41530]
3653 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3654 - [`SplitWhitespace` now implements `Clone`][41659]
3655 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3657 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3658 macros, but for printing to stderr.
3663 - [`OsString::shrink_to_fit`]
3666 - [`thread::ThreadId`]
3671 - [Build scripts can now add environment variables to the environment
3672 the crate is being compiled in.
3673 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3674 - [Subcommands now replace the current process rather than spawning a new
3675 child process][cargo/3970]
3676 - [Workspace members can now accept glob file patterns][cargo/3979]
3677 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3678 the members in a given workspace.][cargo/3988]
3679 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3680 - [Target directory path is now in the cargo metadata][cargo/4022]
3681 - [Cargo no longer checks out a local working directory for the
3682 crates.io index][cargo/4026] This should provide smaller file size for the
3683 registry, and improve cloning times, especially on Windows machines.
3684 - [Added an `--exclude` option for excluding certain packages when using the
3685 `--all` option][cargo/4031]
3686 - [Cargo will now automatically retry when receiving a 5xx error
3687 from crates.io][cargo/4032]
3688 - [The `--features` option now accepts multiple comma or space
3689 delimited values.][cargo/4084]
3690 - [Added support for custom target specific runners][cargo/3954]
3695 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3697 - [Rust will now release XZ compressed packages][rust-installer/57]
3698 - [rustup will now prefer to download rust packages with
3699 XZ compression][rustup/1100] over GZip packages.
3700 - [Added the ability to escape `#` in rust documentation][41785] By adding
3701 additional `#`'s ie. `##` is now `#`
3706 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3707 - [`-Z` flags are now no longer allowed to be used on the stable
3708 compiler.][41751] This has been a warning for a year previous to this.
3709 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3710 longer works][42844]. Users should migrate to the built-in `check`
3711 command, which has been available since 1.16.
3712 - [Ending a float literal with `._` is now a hard error.
3713 Example: `42._` .][41946]
3714 - [Any use of a private `extern crate` outside of its module is now a
3715 hard error.][36886] This was previously a warning.
3716 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3717 relative while the `::` prefix makes a path absolute, but was ignored and the
3718 path was relative regardless.
3719 - [Floating point constants in match patterns is now a hard error][36890]
3720 This was previously a warning.
3721 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3722 match patterns is now a hard error][36891] This was previously a warning.
3723 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3725 - [From the pound escape, lines consisting of multiple `#`s are
3727 - [It is an error to re-export private enum variants][42460]. This is
3728 known to break a number of crates that depend on an older version of
3730 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3731 to use it to find the linker, and the build will fail where it did
3732 not previously][42607]
3734 [36886]: https://github.com/rust-lang/rust/issues/36886
3735 [36888]: https://github.com/rust-lang/rust/issues/36888
3736 [36890]: https://github.com/rust-lang/rust/issues/36890
3737 [36891]: https://github.com/rust-lang/rust/issues/36891
3738 [36892]: https://github.com/rust-lang/rust/issues/36892
3739 [37406]: https://github.com/rust-lang/rust/issues/37406
3740 [39983]: https://github.com/rust-lang/rust/pull/39983
3741 [41145]: https://github.com/rust-lang/rust/pull/41145
3742 [41192]: https://github.com/rust-lang/rust/pull/41192
3743 [41258]: https://github.com/rust-lang/rust/pull/41258
3744 [41370]: https://github.com/rust-lang/rust/pull/41370
3745 [41449]: https://github.com/rust-lang/rust/pull/41449
3746 [41530]: https://github.com/rust-lang/rust/pull/41530
3747 [41624]: https://github.com/rust-lang/rust/pull/41624
3748 [41656]: https://github.com/rust-lang/rust/pull/41656
3749 [41659]: https://github.com/rust-lang/rust/pull/41659
3750 [41676]: https://github.com/rust-lang/rust/pull/41676
3751 [41751]: https://github.com/rust-lang/rust/pull/41751
3752 [41764]: https://github.com/rust-lang/rust/pull/41764
3753 [41785]: https://github.com/rust-lang/rust/pull/41785
3754 [41873]: https://github.com/rust-lang/rust/pull/41873
3755 [41907]: https://github.com/rust-lang/rust/pull/41907
3756 [41946]: https://github.com/rust-lang/rust/pull/41946
3757 [42016]: https://github.com/rust-lang/rust/pull/42016
3758 [42037]: https://github.com/rust-lang/rust/pull/42037
3759 [42068]: https://github.com/rust-lang/rust/pull/42068
3760 [42150]: https://github.com/rust-lang/rust/pull/42150
3761 [42162]: https://github.com/rust-lang/rust/pull/42162
3762 [42225]: https://github.com/rust-lang/rust/pull/42225
3763 [42264]: https://github.com/rust-lang/rust/pull/42264
3764 [42302]: https://github.com/rust-lang/rust/pull/42302
3765 [42460]: https://github.com/rust-lang/rust/issues/42460
3766 [42607]: https://github.com/rust-lang/rust/issues/42607
3767 [42740]: https://github.com/rust-lang/rust/pull/42740
3768 [42844]: https://github.com/rust-lang/rust/issues/42844
3769 [42948]: https://github.com/rust-lang/rust/pull/42948
3770 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3771 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3772 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3773 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3774 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3775 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3776 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3777 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3778 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3779 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3780 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3781 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3782 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3783 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3784 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3785 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3786 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3787 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3788 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3789 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3790 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3791 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3794 Version 1.18.0 (2017-06-08)
3795 ===========================
3800 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3801 make the item visible to just that module tree. Also accepts the keyword
3802 `crate` to make something public to the whole crate but not users of the
3803 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3804 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3805 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3806 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3807 types like `Write + Send`, trailing `+` are now supported in trait objects,
3808 and better error reporting for trait objects starting with `?Sized`.
3809 - [0e+10 is now a valid floating point literal][40589]
3810 - [Now warns if you bind a lifetime parameter to 'static][40734]
3811 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3812 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3813 representation in some cases.][40377]
3818 - [rustc can now emit mir with `--emit mir`][39891]
3819 - [Improved LLVM IR for trivial functions][40367]
3820 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3821 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3822 opportunities found through profiling
3823 - [Improved backtrace formatting when panicking][38165]
3828 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3829 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3830 iteration or reallocation.
3831 - [Simplified HashMap Bucket interface][40561] provides performance
3832 improvements for iterating and cloning.
3833 - [Specialize Vec::from_elem to use calloc][40409]
3834 - [Fixed Race condition in fs::create_dir_all][39799]
3835 - [No longer caching stdio on Windows][40516]
3836 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3837 2.50%~ faster and in one case now 12.50% faster.
3838 - [Optimized `AtomicBool::fetch_nand`][41143]
3843 - [`Child::try_wait`]
3844 - [`HashMap::retain`]
3845 - [`HashSet::retain`]
3847 - [`TcpStream::peek`]
3848 - [`UdpSocket::peek`]
3849 - [`UdpSocket::peek_from`]
3854 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3855 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3856 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3857 - [Added Android build support][cargo/3885]
3858 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3859 of a certain type, for example `cargo build --bins` will build all
3861 - [Added support for haiku][cargo/3952]
3866 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3867 - [Added rust-windbg script for better debugging on Windows][39983]
3868 - [Rust now uses the official cross compiler for NetBSD][40612]
3869 - [rustdoc now accepts `#` at the start of files][40828]
3870 - [Fixed jemalloc support for musl][41168]
3875 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3876 always placed after the sign if it exists and before the digits. With the `#`
3877 flag the zeroes are placed after the prefix and before the digits.
3878 - [Due to the struct field optimisation][40377], using `transmute` on structs
3879 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3880 always been undefined behavior, but is now more likely to break in practice.
3881 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3882 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3883 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3884 - [Overlapping inherent `impl`s are now a hard error][40728]
3885 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3886 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3887 `out.asm` and `out.ll` instead of only one of the filetypes.
3888 - [ calling a function that returns `Self` will no longer work][41805] when
3889 the size of `Self` cannot be statically determined.
3890 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3891 this has caused a few regressions namely:
3893 - Changed the link order of local static/dynamic libraries (respecting the
3894 order on given rather than having the compiler reorder).
3895 - Changed how MinGW is linked, native code linked to dynamic libraries
3896 may require manually linking to the gcc support library (for the native
3899 [38165]: https://github.com/rust-lang/rust/pull/38165
3900 [39799]: https://github.com/rust-lang/rust/pull/39799
3901 [39891]: https://github.com/rust-lang/rust/pull/39891
3902 [39983]: https://github.com/rust-lang/rust/pull/39983
3903 [40043]: https://github.com/rust-lang/rust/pull/40043
3904 [40241]: https://github.com/rust-lang/rust/pull/40241
3905 [40338]: https://github.com/rust-lang/rust/pull/40338
3906 [40367]: https://github.com/rust-lang/rust/pull/40367
3907 [40377]: https://github.com/rust-lang/rust/pull/40377
3908 [40409]: https://github.com/rust-lang/rust/pull/40409
3909 [40516]: https://github.com/rust-lang/rust/pull/40516
3910 [40556]: https://github.com/rust-lang/rust/pull/40556
3911 [40561]: https://github.com/rust-lang/rust/pull/40561
3912 [40589]: https://github.com/rust-lang/rust/pull/40589
3913 [40612]: https://github.com/rust-lang/rust/pull/40612
3914 [40723]: https://github.com/rust-lang/rust/pull/40723
3915 [40728]: https://github.com/rust-lang/rust/pull/40728
3916 [40731]: https://github.com/rust-lang/rust/pull/40731
3917 [40734]: https://github.com/rust-lang/rust/pull/40734
3918 [40805]: https://github.com/rust-lang/rust/pull/40805
3919 [40807]: https://github.com/rust-lang/rust/pull/40807
3920 [40828]: https://github.com/rust-lang/rust/pull/40828
3921 [40870]: https://github.com/rust-lang/rust/pull/40870
3922 [41085]: https://github.com/rust-lang/rust/pull/41085
3923 [41143]: https://github.com/rust-lang/rust/pull/41143
3924 [41168]: https://github.com/rust-lang/rust/pull/41168
3925 [41270]: https://github.com/rust-lang/rust/issues/41270
3926 [41469]: https://github.com/rust-lang/rust/pull/41469
3927 [41805]: https://github.com/rust-lang/rust/issues/41805
3928 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3929 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3930 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3931 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3932 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3933 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3934 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3935 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3936 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3937 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3938 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3939 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3940 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3941 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3944 Version 1.17.0 (2017-04-27)
3945 ===========================
3950 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3951 * [Fields of structs may be initialized without duplicating the field/variable
3952 names][39761]. [RFC 1682]
3953 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3954 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3955 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3956 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3957 `'b`. Soundness fix.
3958 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3959 * [Static variables may contain references to other statics][40027]
3964 * [Exit quickly on only `--emit dep-info`][40336]
3965 * [Make `-C relocation-model` more correctly determine whether the linker
3966 creates a position-independent executable][40245]
3967 * [Add `-C overflow-checks` to directly control whether integer overflow
3969 * [The rustc type checker now checks items on demand instead of in a single
3970 in-order pass][40008]. This is mostly an internal refactoring in support of
3971 future work, including incremental type checking, but also resolves [RFC
3972 1647], allowing `Self` to appear in `impl` `where` clauses.
3973 * [Optimize vtable loads][39995]
3974 * [Turn off vectorization for Emscripten targets][39990]
3975 * [Provide suggestions for unknown macros imported with `use`][39953]
3976 * [Fix ICEs in path resolution][39939]
3977 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3978 * [Add clearer error message using `&str + &str`][39116]
3989 * [`Ordering::then`]
3990 * [`Ordering::then_with`]
3991 * [`BTreeMap::range`]
3992 * [`BTreeMap::range_mut`]
3993 * [`collections::Bound`]
3994 * [`process::abort`]
3995 * [`ptr::read_unaligned`]
3996 * [`ptr::write_unaligned`]
3997 * [`Result::expect_err`]
4000 * [`Cell::into_inner`]
4006 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4007 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4008 * [`String` implements `FromIterator<&char>`][40028]
4009 * `Box` [implements][40009] a number of new conversions:
4010 `From<Box<str>> for String`,
4011 `From<Box<[T]>> for Vec<T>`,
4012 `From<Box<CStr>> for CString`,
4013 `From<Box<OsStr>> for OsString`,
4014 `From<Box<Path>> for PathBuf`,
4015 `Into<Box<str>> for String`,
4016 `Into<Box<[T]>> for Vec<T>`,
4017 `Into<Box<CStr>> for CString`,
4018 `Into<Box<OsStr>> for OsString`,
4019 `Into<Box<Path>> for PathBuf`,
4020 `Default for Box<str>`,
4021 `Default for Box<CStr>`,
4022 `Default for Box<OsStr>`,
4023 `From<&CStr> for Box<CStr>`,
4024 `From<&OsStr> for Box<OsStr>`,
4025 `From<&Path> for Box<Path>`
4026 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4027 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4028 * [Slightly optimize `slice::sort`][39538]
4029 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4030 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4031 `Box<str>` implements `From<&str>`][39438]
4032 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4033 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4034 * [`format!` estimates the needed capacity before writing a string][39356]
4035 * [Support unprivileged symlink creation in Windows][38921]
4036 * [`PathBuf` implements `Default`][38764]
4037 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4038 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4039 and poor hash functions.
4044 * [Add `cargo check --all`][cargo/3731]
4045 * [Add an option to ignore SSL revocation checking][cargo/3699]
4046 * [Add `cargo run --package`][cargo/3691]
4047 * [Add `required_features`][cargo/3667]
4048 * [Assume `build.rs` is a build script][cargo/3664]
4049 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4054 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4056 * [The "Unstable Book" documents nightly-only features][ubook]
4057 * [Improve the style of the sidebar in rustdoc output][40265]
4058 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4059 * [Fix MSP430 breakage due to `i128`][40257]
4060 * [Preliminary Solaris/SPARCv9 support][39903]
4061 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4062 run without installing the MSVC runtime.
4063 * [`rustdoc --test` includes file names in test names][39788]
4064 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4065 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4066 * [Initial support for `aarch64-unknown-freebsd`][39491]
4067 * [Initial support for `i686-unknown-netbsd`][39426]
4068 * [This release no longer includes the old makefile build system][39431]. Rust
4069 is built with a custom build system, written in Rust, and with Cargo.
4070 * [Add Debug implementations for libcollection structs][39002]
4071 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4072 * [`--test-threads=0` produces an error][38945]
4073 * [`rustup` installs documentation by default][40526]
4074 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4075 WinDbg and Visual Studio to improve the debugging experience.
4080 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4081 workaround, either use MSVC 2015 or run vcvars.bat.
4082 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4083 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4084 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4086 * [`format!` and `Display::to_string` panic if an underlying formatting
4087 implementation returns an error][40117]. Previously the error was silently
4088 ignored. It is incorrect for `write_fmt` to return an error when writing
4090 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4091 crates were marked stable and could be accessed from the stable toolchain.
4092 * [Rust git source no longer includes vendored crates][39728]. Those that need
4093 to build with vendored crates should build from release tarballs.
4094 * [Fix inert attributes from `proc_macro_derives`][39572]
4095 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4096 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4098 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4099 existing code generally ignores the type of dead-code unless a type-hint is
4100 provided; this can cause surprising inference interactions particularly around
4101 defaulting. The new code uniformly ignores the result type of dead-code.
4102 * [Tuple-struct constructors with private fields are no longer visible][38932]
4103 * [Lifetime parameters that do not appear in the arguments are now considered
4104 early-bound][38897], resolving a soundness bug (#[32330]). The
4105 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4107 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4108 * [Make transmuting from fn item types to pointer-sized types a hard
4111 [27787]: https://github.com/rust-lang/rust/issues/27787
4112 [32330]: https://github.com/rust-lang/rust/issues/32330
4113 [34198]: https://github.com/rust-lang/rust/pull/34198
4114 [38161]: https://github.com/rust-lang/rust/pull/38161
4115 [38368]: https://github.com/rust-lang/rust/pull/38368
4116 [38584]: https://github.com/rust-lang/rust/issues/38584
4117 [38661]: https://github.com/rust-lang/rust/pull/38661
4118 [38764]: https://github.com/rust-lang/rust/pull/38764
4119 [38864]: https://github.com/rust-lang/rust/issues/38864
4120 [38897]: https://github.com/rust-lang/rust/pull/38897
4121 [38921]: https://github.com/rust-lang/rust/pull/38921
4122 [38932]: https://github.com/rust-lang/rust/pull/38932
4123 [38945]: https://github.com/rust-lang/rust/pull/38945
4124 [38981]: https://github.com/rust-lang/rust/pull/38981
4125 [39002]: https://github.com/rust-lang/rust/pull/39002
4126 [39116]: https://github.com/rust-lang/rust/pull/39116
4127 [39193]: https://github.com/rust-lang/rust/pull/39193
4128 [39265]: https://github.com/rust-lang/rust/pull/39265
4129 [39356]: https://github.com/rust-lang/rust/pull/39356
4130 [39372]: https://github.com/rust-lang/rust/pull/39372
4131 [39426]: https://github.com/rust-lang/rust/pull/39426
4132 [39431]: https://github.com/rust-lang/rust/pull/39431
4133 [39438]: https://github.com/rust-lang/rust/pull/39438
4134 [39440]: https://github.com/rust-lang/rust/pull/39440
4135 [39485]: https://github.com/rust-lang/rust/pull/39485
4136 [39491]: https://github.com/rust-lang/rust/pull/39491
4137 [39518]: https://github.com/rust-lang/rust/pull/39518
4138 [39538]: https://github.com/rust-lang/rust/pull/39538
4139 [39572]: https://github.com/rust-lang/rust/pull/39572
4140 [39633]: https://github.com/rust-lang/rust/pull/39633
4141 [39642]: https://github.com/rust-lang/rust/pull/39642
4142 [39728]: https://github.com/rust-lang/rust/pull/39728
4143 [39761]: https://github.com/rust-lang/rust/pull/39761
4144 [39788]: https://github.com/rust-lang/rust/pull/39788
4145 [39793]: https://github.com/rust-lang/rust/pull/39793
4146 [39837]: https://github.com/rust-lang/rust/pull/39837
4147 [39843]: https://github.com/rust-lang/rust/pull/39843
4148 [39851]: https://github.com/rust-lang/rust/pull/39851
4149 [39903]: https://github.com/rust-lang/rust/pull/39903
4150 [39939]: https://github.com/rust-lang/rust/pull/39939
4151 [39953]: https://github.com/rust-lang/rust/pull/39953
4152 [39960]: https://github.com/rust-lang/rust/pull/39960
4153 [39990]: https://github.com/rust-lang/rust/pull/39990
4154 [39995]: https://github.com/rust-lang/rust/pull/39995
4155 [40008]: https://github.com/rust-lang/rust/pull/40008
4156 [40009]: https://github.com/rust-lang/rust/pull/40009
4157 [40027]: https://github.com/rust-lang/rust/pull/40027
4158 [40028]: https://github.com/rust-lang/rust/pull/40028
4159 [40037]: https://github.com/rust-lang/rust/pull/40037
4160 [40117]: https://github.com/rust-lang/rust/pull/40117
4161 [40166]: https://github.com/rust-lang/rust/pull/40166
4162 [40245]: https://github.com/rust-lang/rust/pull/40245
4163 [40257]: https://github.com/rust-lang/rust/pull/40257
4164 [40261]: https://github.com/rust-lang/rust/pull/40261
4165 [40265]: https://github.com/rust-lang/rust/pull/40265
4166 [40319]: https://github.com/rust-lang/rust/pull/40319
4167 [40336]: https://github.com/rust-lang/rust/pull/40336
4168 [40526]: https://github.com/rust-lang/rust/pull/40526
4169 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4170 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4171 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4172 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4173 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4174 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4175 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4176 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4177 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4178 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4179 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4180 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4181 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4182 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4183 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4184 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4185 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4186 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4187 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4188 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4189 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4190 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4191 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4192 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4193 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4194 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4195 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4196 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4197 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4198 [mdbook]: https://crates.io/crates/mdbook
4199 [ubook]: https://doc.rust-lang.org/unstable-book/
4202 Version 1.16.0 (2017-03-16)
4203 ===========================
4208 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4209 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4210 match patterns][38069]
4211 * [Clean up semantics of `self` in an import list][38313]
4212 * [`Self` may appear in `impl` headers][38920]
4213 * [`Self` may appear in struct expressions][39282]
4218 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4219 a `.rmeta` file containing only crate metadata][38571]. This can be
4220 used by tools like the Rust Language Service to perform
4221 metadata-only builds.
4222 * [Levenshtein based typo suggestions now work in most places, while
4223 previously they worked only for fields and sometimes for local
4224 variables][38927]. Together with the overhaul of "no
4225 resolution"/"unexpected resolution" errors (#[38154]) they result in
4226 large and systematic improvement in resolution diagnostics.
4227 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4229 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4230 * [`rustc` no longer attempts to provide "consider using an explicit
4231 lifetime" suggestions][37057]. They were inaccurate.
4236 * [`VecDeque::truncate`]
4237 * [`VecDeque::resize`]
4238 * [`String::insert_str`]
4239 * [`Duration::checked_add`]
4240 * [`Duration::checked_sub`]
4241 * [`Duration::checked_div`]
4242 * [`Duration::checked_mul`]
4245 * [`SocketAddr::is_ipv4`]
4246 * [`SocketAddr::is_ipv6`]
4247 * [`IpAddr::is_ipv4`]
4248 * [`IpAddr::is_ipv6`]
4250 * [`Vec::dedup_by_key`]
4251 * [`Result::unwrap_or_default`]
4252 * [`<*const T>::wrapping_offset`]
4253 * [`<*mut T>::wrapping_offset`]
4254 * `CommandExt::creation_flags`
4255 * [`File::set_permissions`]
4256 * [`String::split_off`]
4261 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4262 their argument by `Borrow` parameter][37761]
4263 * [All public types in std implement `Debug`][38006]
4264 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4265 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4266 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4268 * [std: Fix partial writes in `LineWriter`][38062]
4269 * [std: Clamp max read/write sizes on Unix][38062]
4270 * [Use more specific panic message for `&str` slicing errors][38066]
4271 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4272 functionality cannot be achieved in std currently.
4273 * [`writeln!`, like `println!`, now accepts a form with no string
4274 or formatting arguments, to just print a newline][38469]
4275 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4276 * [Reduce the size of static data in `std_unicode::tables`][38781]
4277 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4278 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4280 * [`Duration` implements `Sum`][38712]
4281 * [`String` implements `ToSocketAddrs`][39048]
4286 * [The `cargo check` command does a type check of a project without
4287 building it][cargo/3296]
4288 * [crates.io will display CI badges from Travis and AppVeyor, if
4289 specified in Cargo.toml][cargo/3546]
4290 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4291 * [Compilation profiles accept integer values for `debug`, in addition
4292 to `true` and `false`. These are passed to `rustc` as the value to
4293 `-C debuginfo`][cargo/3534]
4294 * [Implement `cargo --version --verbose`][cargo/3604]
4295 * [All builds now output 'dep-info' build dependencies compatible with
4296 make and ninja][cargo/3557]
4297 * [Build all workspace members with `build --all`][cargo/3511]
4298 * [Document all workspace members with `doc --all`][cargo/3515]
4299 * [Path deps outside workspace are not members][cargo/3443]
4304 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4305 the path to the Rust implementation][38589]
4306 * [The `armv7-linux-androideabi` target no longer enables NEON
4307 extensions, per Google's ABI guide][38413]
4308 * [The stock standard library can be compiled for Redox OS][38401]
4309 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4311 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4313 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4318 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4319 match patterns][38069]
4320 * In this release, references to uninhabited types can not be
4321 pattern-matched. This was accidentally allowed in 1.15.
4322 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4323 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4325 * [Clean up semantics of `self` in an import list][38313]
4326 * Reimplemented lifetime elision. This change was almost entirely compatible
4327 with existing code, but it did close a number of small bugs and loopholes,
4328 as well as being more accepting in some other [cases][41105].
4330 [37057]: https://github.com/rust-lang/rust/pull/37057
4331 [37761]: https://github.com/rust-lang/rust/pull/37761
4332 [38006]: https://github.com/rust-lang/rust/pull/38006
4333 [38051]: https://github.com/rust-lang/rust/pull/38051
4334 [38062]: https://github.com/rust-lang/rust/pull/38062
4335 [38062]: https://github.com/rust-lang/rust/pull/38622
4336 [38066]: https://github.com/rust-lang/rust/pull/38066
4337 [38069]: https://github.com/rust-lang/rust/pull/38069
4338 [38131]: https://github.com/rust-lang/rust/pull/38131
4339 [38154]: https://github.com/rust-lang/rust/pull/38154
4340 [38274]: https://github.com/rust-lang/rust/pull/38274
4341 [38304]: https://github.com/rust-lang/rust/pull/38304
4342 [38313]: https://github.com/rust-lang/rust/pull/38313
4343 [38314]: https://github.com/rust-lang/rust/pull/38314
4344 [38327]: https://github.com/rust-lang/rust/pull/38327
4345 [38401]: https://github.com/rust-lang/rust/pull/38401
4346 [38413]: https://github.com/rust-lang/rust/pull/38413
4347 [38469]: https://github.com/rust-lang/rust/pull/38469
4348 [38559]: https://github.com/rust-lang/rust/pull/38559
4349 [38571]: https://github.com/rust-lang/rust/pull/38571
4350 [38580]: https://github.com/rust-lang/rust/pull/38580
4351 [38589]: https://github.com/rust-lang/rust/pull/38589
4352 [38670]: https://github.com/rust-lang/rust/pull/38670
4353 [38712]: https://github.com/rust-lang/rust/pull/38712
4354 [38726]: https://github.com/rust-lang/rust/pull/38726
4355 [38781]: https://github.com/rust-lang/rust/pull/38781
4356 [38798]: https://github.com/rust-lang/rust/pull/38798
4357 [38909]: https://github.com/rust-lang/rust/pull/38909
4358 [38920]: https://github.com/rust-lang/rust/pull/38920
4359 [38927]: https://github.com/rust-lang/rust/pull/38927
4360 [39048]: https://github.com/rust-lang/rust/pull/39048
4361 [39282]: https://github.com/rust-lang/rust/pull/39282
4362 [39379]: https://github.com/rust-lang/rust/pull/39379
4363 [41105]: https://github.com/rust-lang/rust/issues/41105
4364 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4365 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4366 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4367 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4368 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4369 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4370 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4371 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4372 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4373 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4374 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4375 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4376 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4377 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4378 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4379 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4380 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4381 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4382 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4383 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4384 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4385 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4386 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4387 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4388 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4389 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4390 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4391 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4392 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4393 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4396 Version 1.15.1 (2017-02-09)
4397 ===========================
4399 * [Fix IntoIter::as_mut_slice's signature][39466]
4400 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4402 [39466]: https://github.com/rust-lang/rust/pull/39466
4403 [39523]: https://github.com/rust-lang/rust/pull/39523
4406 Version 1.15.0 (2017-02-02)
4407 ===========================
4412 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4413 stable. This allows popular code-generating crates like Serde and Diesel to
4414 work ergonomically. [RFC 1681].
4415 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4416 with curly braces][36868]. Part of [RFC 1506].
4417 * [A number of minor changes to name resolution have been activated][37127].
4418 They add up to more consistent semantics, allowing for future evolution of
4419 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4420 details of what is different. The breaking changes here have been transitioned
4421 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4422 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4424 * [`?Sized` can be used in `where` clauses][37791]
4425 * [There is now a limit on the size of monomorphized types and it can be
4426 modified with the `#![type_size_limit]` crate attribute, similarly to
4427 the `#![recursion_limit]` attribute][37789]
4432 * [On Windows, the compiler will apply dllimport attributes when linking to
4433 extern functions][37973]. Additional attributes and flags can control which
4434 library kind is linked and its name. [RFC 1717].
4435 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4436 * [The `--test` flag works with procedural macro crates][38107]
4437 * [Fix `extern "aapcs" fn` ABI][37814]
4438 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4439 * [The `format!` expander recognizes incorrect `printf` and shell-style
4440 formatting directives and suggests the correct format][37613].
4441 * [Only report one error for all unused imports in an import list][37456]
4443 Compiler Performance
4444 --------------------
4446 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4447 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4448 * [Don't clone in `UnificationTable::probe`][37848]
4449 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4450 * [Use small vectors in type walker][37760]
4451 * [Macro expansion performance was improved][37701]
4452 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4453 * [Replace FNV with a faster hash function][37229]
4458 * [`std::iter::Iterator::min_by`]
4459 * [`std::iter::Iterator::max_by`]
4460 * [`std::os::*::fs::FileExt`]
4461 * [`std::sync::atomic::Atomic*::get_mut`]
4462 * [`std::sync::atomic::Atomic*::into_inner`]
4463 * [`std::vec::IntoIter::as_slice`]
4464 * [`std::vec::IntoIter::as_mut_slice`]
4465 * [`std::sync::mpsc::Receiver::try_iter`]
4466 * [`std::os::unix::process::CommandExt::before_exec`]
4467 * [`std::rc::Rc::strong_count`]
4468 * [`std::rc::Rc::weak_count`]
4469 * [`std::sync::Arc::strong_count`]
4470 * [`std::sync::Arc::weak_count`]
4471 * [`std::char::encode_utf8`]
4472 * [`std::char::encode_utf16`]
4473 * [`std::cell::Ref::clone`]
4474 * [`std::io::Take::into_inner`]
4479 * [The standard sorting algorithm has been rewritten for dramatic performance
4480 improvements][38192]. It is a hybrid merge sort, drawing influences from
4481 Timsort. Previously it was a naive merge sort.
4482 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4483 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4485 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4486 and `char_indices().last()`][37882]
4487 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4488 * [Chinese characters display correctly in `fmt::Debug`][37855]
4489 * [Derive `Default` for `Duration`][37699]
4490 * [Support creation of anonymous pipes on WinXP/2k][37677]
4491 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4492 * [Don't pass overlapped handles to processes][38835]
4497 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4498 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4499 should instead check the variable at runtime with `std::env`. That the value
4500 was set at build time was a bug, and incorrect when cross-compiling. This
4501 change is known to cause breakage.
4502 * [Add `--all` flag to `cargo test`][cargo/3221]
4503 * [Compile statically against the MSVC CRT][cargo/3363]
4504 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4505 * [Link OpenSSL statically on OSX][cargo/3311]
4506 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4507 * [Test for bad path overrides with summaries][cargo/3336]
4508 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4509 * [Fix retrying crate downloads for network errors][cargo/3348]
4510 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4511 * [Emit more info on --message-format=json][cargo/3319]
4512 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4513 * [Don't ignore errors in workspace manifest][cargo/3409]
4514 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4519 * [Test runners (binaries built with `--test`) now support a `--list` argument
4520 that lists the tests it contains][38185]
4521 * [Test runners now support a `--exact` argument that makes the test filter
4522 match exactly, instead of matching only a substring of the test name][38181]
4523 * [rustdoc supports a `--playground-url` flag][37763]
4524 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4529 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4530 continue to be used in this release by passing `--disable-rustbuild` to the
4531 configure script, but they will be deleted soon. Note that the new build
4532 system uses a different on-disk layout that will likely affect any scripts
4534 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4536 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4537 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4543 * [A number of minor changes to name resolution have been activated][37127].
4544 They add up to more consistent semantics, allowing for future evolution of
4545 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4546 details of what is different. The breaking changes here have been transitioned
4547 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4548 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4549 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4550 should instead check the variable at runtime with `std::env`. That the value
4551 was set at build time was a bug, and incorrect when cross-compiling. This
4552 change is known to cause breakage.
4553 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4554 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4555 1.10 and is now an error by default. It will become a hard error in the near
4557 * [The semantics relating modules to file system directories are changing in
4558 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4559 lint, which is a warning in this release, and will become a hard error in the
4561 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4562 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4563 the underlying iterator][37834]
4565 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4566 [33685]: https://github.com/rust-lang/rust/issues/33685
4567 [36868]: https://github.com/rust-lang/rust/pull/36868
4568 [37127]: https://github.com/rust-lang/rust/pull/37127
4569 [37229]: https://github.com/rust-lang/rust/pull/37229
4570 [37456]: https://github.com/rust-lang/rust/pull/37456
4571 [37527]: https://github.com/rust-lang/rust/pull/37527
4572 [37602]: https://github.com/rust-lang/rust/pull/37602
4573 [37613]: https://github.com/rust-lang/rust/pull/37613
4574 [37615]: https://github.com/rust-lang/rust/pull/37615
4575 [37636]: https://github.com/rust-lang/rust/pull/37636
4576 [37627]: https://github.com/rust-lang/rust/pull/37627
4577 [37642]: https://github.com/rust-lang/rust/pull/37642
4578 [37677]: https://github.com/rust-lang/rust/pull/37677
4579 [37699]: https://github.com/rust-lang/rust/pull/37699
4580 [37701]: https://github.com/rust-lang/rust/pull/37701
4581 [37705]: https://github.com/rust-lang/rust/pull/37705
4582 [37749]: https://github.com/rust-lang/rust/pull/37749
4583 [37760]: https://github.com/rust-lang/rust/pull/37760
4584 [37763]: https://github.com/rust-lang/rust/pull/37763
4585 [37764]: https://github.com/rust-lang/rust/pull/37764
4586 [37789]: https://github.com/rust-lang/rust/pull/37789
4587 [37791]: https://github.com/rust-lang/rust/pull/37791
4588 [37814]: https://github.com/rust-lang/rust/pull/37814
4589 [37817]: https://github.com/rust-lang/rust/pull/37817
4590 [37834]: https://github.com/rust-lang/rust/pull/37834
4591 [37848]: https://github.com/rust-lang/rust/pull/37848
4592 [37855]: https://github.com/rust-lang/rust/pull/37855
4593 [37882]: https://github.com/rust-lang/rust/pull/37882
4594 [37888]: https://github.com/rust-lang/rust/pull/37888
4595 [37973]: https://github.com/rust-lang/rust/pull/37973
4596 [37979]: https://github.com/rust-lang/rust/pull/37979
4597 [38086]: https://github.com/rust-lang/rust/pull/38086
4598 [38107]: https://github.com/rust-lang/rust/pull/38107
4599 [38117]: https://github.com/rust-lang/rust/pull/38117
4600 [38134]: https://github.com/rust-lang/rust/pull/38134
4601 [38146]: https://github.com/rust-lang/rust/pull/38146
4602 [38181]: https://github.com/rust-lang/rust/pull/38181
4603 [38182]: https://github.com/rust-lang/rust/pull/38182
4604 [38185]: https://github.com/rust-lang/rust/pull/38185
4605 [38192]: https://github.com/rust-lang/rust/pull/38192
4606 [38279]: https://github.com/rust-lang/rust/pull/38279
4607 [38835]: https://github.com/rust-lang/rust/pull/38835
4608 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4609 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4610 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4611 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4612 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4613 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4614 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4615 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4616 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4617 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4618 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4619 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4620 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4621 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4622 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4623 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4624 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4625 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4626 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4627 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4628 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4629 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4630 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4631 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4632 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4633 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4634 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4635 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4636 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4637 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4638 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4639 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4640 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4641 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4642 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4643 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4644 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4645 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4648 Version 1.14.0 (2016-12-22)
4649 ===========================
4654 * [`..` matches multiple tuple fields in enum variants, structs
4655 and tuples][36843]. [RFC 1492].
4656 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4657 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4658 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4659 dereferencing][36822]
4664 * [Mark enums with non-zero discriminant as non-zero][37224]
4665 * [Lower-case `static mut` names are linted like other
4666 statics and consts][37162]
4667 * [Fix ICE on some macros in const integer positions
4668 (e.g. `[u8; m!()]`)][36819]
4669 * [Improve error message and snippet for "did you mean `x`"][36798]
4670 * [Add a panic-strategy field to the target specification][36794]
4671 * [Include LLVM version in `--version --verbose`][37200]
4673 Compile-time Optimizations
4674 --------------------------
4676 * [Improve macro expansion performance][37569]
4677 * [Shrink `Expr_::ExprInlineAsm`][37445]
4678 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4679 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4680 * [Avoid more allocations when compiling html5ever][37373]
4681 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4682 * [Avoid some allocations in the macro parser][37318]
4683 * [Use a faster deflate setting][37298]
4684 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4685 during interning of slices][37270]
4686 * [Optimize `write_metadata`][37267]
4687 * [Don't process obligation forest cycles when stalled][37231]
4688 * [Avoid many `CrateConfig` clones][37161]
4689 * [Optimize `Substs::super_fold_with`][37108]
4690 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4691 * [Speed up `plug_leaks`][36917]
4696 * [`println!()`, with no arguments, prints newline][36825].
4697 Previously, an empty string was required to achieve the same.
4698 * [`Wrapping` impls standard binary and unary operators, as well as
4699 the `Sum` and `Product` iterators][37356]
4700 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4702 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4703 `VecDeque` iterators][37315]
4704 * [Improve `SipHasher` performance on small values][37312]
4705 * [Add Iterator trait TrustedLen to enable better FromIterator /
4707 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4708 * [`ReadDir` implements `Debug`][37221]
4709 * [Implement `RefUnwindSafe` for atomic types][37178]
4710 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4711 * [Avoid allocations in `Decoder::read_str`][37064]
4712 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4713 * [Impl `Debug` for raw pointers to unsized data][36880]
4714 * [Don't reuse `HashMap` random seeds][37470]
4715 * [The internal memory layout of `HashMap` is more cache-friendly, for
4716 significant improvements in some operations][36692]
4717 * [`HashMap` uses less memory on 32-bit architectures][36595]
4718 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4723 * [Expose rustc cfg values to build scripts][cargo/3243]
4724 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4725 * [Fix passing --features when testing multiple packages][cargo/3280]
4726 * [Use a single profile set per workspace][cargo/3249]
4727 * [Load `replace` sections from lock files][cargo/3220]
4728 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4733 * [rustup is the recommended Rust installation method][1.14rustup]
4734 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4735 S390x. These are [tier 2] platforms and may have major defects. Follow the
4736 instructions on the website to install, or add the targets to an existing
4737 installation with `rustup target add`. The new target triples are:
4738 - `mips-unknown-linux-gnu`
4739 - `mipsel-unknown-linux-gnu`
4740 - `mips64-unknown-linux-gnuabi64`
4741 - `mips64el-unknown-linux-gnuabi64 `
4742 - `powerpc-unknown-linux-gnu`
4743 - `powerpc64-unknown-linux-gnu`
4744 - `powerpc64le-unknown-linux-gnu`
4745 - `s390x-unknown-linux-gnu `
4746 * This release includes target (std) builds for ARM Linux running MUSL
4747 libc. These are [tier 2] platforms and may have major defects. Add the
4748 following triples to an existing rustup installation with `rustup target add`:
4749 - `arm-unknown-linux-musleabi`
4750 - `arm-unknown-linux-musleabihf`
4751 - `armv7-unknown-linux-musleabihf`
4752 * This release includes [experimental support for WebAssembly][1.14wasm], via
4753 the `wasm32-unknown-emscripten` target. This target is known to have major
4754 defects. Please test, report, and fix.
4755 * rustup no longer installs documentation by default. Run `rustup
4756 component add rust-docs` to install.
4757 * [Fix line stepping in debugger][37310]
4758 * [Enable line number debuginfo in releases][37280]
4763 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4764 * [Add support for Fuchsia OS][37313]
4765 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4770 * [A number of forward-compatibility lints used by the compiler
4771 to gradually introduce language changes have been converted
4772 to deny by default][36894]:
4773 - ["use of inaccessible extern crate erroneously allowed"][36886]
4774 - ["type parameter default erroneously allowed in invalid location"][36887]
4775 - ["detects super or self keywords at the beginning of global path"][36888]
4776 - ["two overlapping inherent impls define an item with the same name
4777 were erroneously allowed"][36889]
4778 - ["floating-point constants cannot be used in patterns"][36890]
4779 - ["constants of struct or enum type can only be used in a pattern if
4780 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4781 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4782 * [Prohibit patterns in trait methods without bodies][37378]
4783 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4784 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4785 * [The `$crate` macro variable is accepted in fewer locations][37213]
4786 * [Impls specifying extra region requirements beyond the trait
4787 they implement are rejected][37167]
4788 * [Enums may not be unsized][37111]. Unsized enums are intended to
4789 work but never have. For now they are forbidden.
4790 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4792 [tier 2]: https://forge.rust-lang.org/platform-support.html
4793 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4794 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4795 [36430]: https://github.com/rust-lang/rust/pull/36430
4796 [36595]: https://github.com/rust-lang/rust/pull/36595
4797 [36595]: https://github.com/rust-lang/rust/pull/36595
4798 [36692]: https://github.com/rust-lang/rust/pull/36692
4799 [36767]: https://github.com/rust-lang/rust/pull/36767
4800 [36794]: https://github.com/rust-lang/rust/pull/36794
4801 [36798]: https://github.com/rust-lang/rust/pull/36798
4802 [36819]: https://github.com/rust-lang/rust/pull/36819
4803 [36822]: https://github.com/rust-lang/rust/pull/36822
4804 [36825]: https://github.com/rust-lang/rust/pull/36825
4805 [36843]: https://github.com/rust-lang/rust/pull/36843
4806 [36880]: https://github.com/rust-lang/rust/pull/36880
4807 [36886]: https://github.com/rust-lang/rust/issues/36886
4808 [36887]: https://github.com/rust-lang/rust/issues/36887
4809 [36888]: https://github.com/rust-lang/rust/issues/36888
4810 [36889]: https://github.com/rust-lang/rust/issues/36889
4811 [36890]: https://github.com/rust-lang/rust/issues/36890
4812 [36891]: https://github.com/rust-lang/rust/issues/36891
4813 [36892]: https://github.com/rust-lang/rust/issues/36892
4814 [36894]: https://github.com/rust-lang/rust/pull/36894
4815 [36917]: https://github.com/rust-lang/rust/pull/36917
4816 [36993]: https://github.com/rust-lang/rust/pull/36993
4817 [37037]: https://github.com/rust-lang/rust/pull/37037
4818 [37064]: https://github.com/rust-lang/rust/pull/37064
4819 [37094]: https://github.com/rust-lang/rust/pull/37094
4820 [37108]: https://github.com/rust-lang/rust/pull/37108
4821 [37111]: https://github.com/rust-lang/rust/pull/37111
4822 [37161]: https://github.com/rust-lang/rust/pull/37161
4823 [37162]: https://github.com/rust-lang/rust/pull/37162
4824 [37167]: https://github.com/rust-lang/rust/pull/37167
4825 [37178]: https://github.com/rust-lang/rust/pull/37178
4826 [37200]: https://github.com/rust-lang/rust/pull/37200
4827 [37213]: https://github.com/rust-lang/rust/pull/37213
4828 [37221]: https://github.com/rust-lang/rust/pull/37221
4829 [37224]: https://github.com/rust-lang/rust/pull/37224
4830 [37230]: https://github.com/rust-lang/rust/pull/37230
4831 [37231]: https://github.com/rust-lang/rust/pull/37231
4832 [37247]: https://github.com/rust-lang/rust/pull/37247
4833 [37267]: https://github.com/rust-lang/rust/pull/37267
4834 [37270]: https://github.com/rust-lang/rust/pull/37270
4835 [37273]: https://github.com/rust-lang/rust/pull/37273
4836 [37280]: https://github.com/rust-lang/rust/pull/37280
4837 [37298]: https://github.com/rust-lang/rust/pull/37298
4838 [37306]: https://github.com/rust-lang/rust/pull/37306
4839 [37310]: https://github.com/rust-lang/rust/pull/37310
4840 [37312]: https://github.com/rust-lang/rust/pull/37312
4841 [37313]: https://github.com/rust-lang/rust/pull/37313
4842 [37315]: https://github.com/rust-lang/rust/pull/37315
4843 [37318]: https://github.com/rust-lang/rust/pull/37318
4844 [37322]: https://github.com/rust-lang/rust/pull/37322
4845 [37326]: https://github.com/rust-lang/rust/pull/37326
4846 [37351]: https://github.com/rust-lang/rust/pull/37351
4847 [37356]: https://github.com/rust-lang/rust/pull/37356
4848 [37367]: https://github.com/rust-lang/rust/pull/37367
4849 [37373]: https://github.com/rust-lang/rust/pull/37373
4850 [37378]: https://github.com/rust-lang/rust/pull/37378
4851 [37389]: https://github.com/rust-lang/rust/pull/37389
4852 [37392]: https://github.com/rust-lang/rust/pull/37392
4853 [37427]: https://github.com/rust-lang/rust/pull/37427
4854 [37439]: https://github.com/rust-lang/rust/pull/37439
4855 [37445]: https://github.com/rust-lang/rust/pull/37445
4856 [37470]: https://github.com/rust-lang/rust/pull/37470
4857 [37569]: https://github.com/rust-lang/rust/pull/37569
4858 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4859 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4860 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4861 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4862 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4863 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4864 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4867 Version 1.13.0 (2016-11-10)
4868 ===========================
4873 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4874 errors, like the `try!` macro, described in [RFC 0243].
4875 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4876 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4877 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4878 * [Fix lifetime rules for 'if' conditions][36029]
4879 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4884 * [Add the `-C link-arg` argument][36574]
4885 * [Remove the old AST-based backend from rustc_trans][35764]
4886 * [Don't enable NEON by default on armv7 Linux][35814]
4887 * [Fix debug line number info for macro expansions][35238]
4888 * [Do not emit "class method" debuginfo for types that are not
4889 DICompositeType][36008]
4890 * [Warn about multiple conflicting #[repr] hints][34623]
4891 * [When sizing DST, don't double-count nested struct prefixes][36351]
4892 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4893 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4894 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4895 * [Expand macros without recursing to avoid stack overflows][36214]
4900 * [Replace macro backtraces with labeled local uses][35702]
4901 * [Improve error message for misplaced doc comments][33922]
4902 * [Buffer unix and lock windows to prevent message interleaving][35975]
4903 * [Update lifetime errors to specifically note temporaries][36171]
4904 * [Special case a few colors for Windows][36178]
4905 * [Suggest `use self` when such an import resolves][36289]
4906 * [Be more specific when type parameter shadows primitive type][36338]
4907 * Many minor improvements
4909 Compile-time Optimizations
4910 --------------------------
4912 * [Compute and cache HIR hashes at beginning][35854]
4913 * [Don't hash types in loan paths][36004]
4914 * [Cache projections in trans][35761]
4915 * [Optimize the parser's last token handling][36527]
4916 * [Only instantiate #[inline] functions in codegen units referencing
4917 them][36524]. This leads to big improvements in cases where crates export
4918 define many inline functions without using them directly.
4919 * [Lazily allocate TypedArena's first chunk][36592]
4920 * [Don't allocate during default HashSet creation][36734]
4927 * [`overflowing_abs`]
4928 * [`RefCell::try_borrow`]
4929 * [`RefCell::try_borrow_mut`]
4934 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4935 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4937 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4938 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4939 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4940 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4941 * [Use arc4rand on FreeBSD][35884]
4942 * [memrchr: Correct aligned offset computation][35969]
4943 * [Improve Demangling of Rust Symbols][36059]
4944 * [Use monotonic time in condition variables][35048]
4945 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4946 * [Implement conversion traits for `char`][35755]
4947 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4948 * [Zero first byte of CString on drop][36264]
4949 * [Inherit overflow checks for sum and product][36372]
4950 * [Add missing Eq implementations][36423]
4951 * [Implement `Debug` for `DirEntry`][36631]
4952 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4954 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4955 * [Implement more traits for `std::io::ErrorKind`][35911]
4956 * [Optimize BinaryHeap bounds checking][36072]
4957 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4958 `extend_with_element`][36355]
4959 * [Fix overflow checking in unsigned pow()][34942]
4964 * This release includes security fixes to both curl and OpenSSL.
4965 * [Fix transitive doctests when panic=abort][cargo/3021]
4966 * [Add --all-features flag to cargo][cargo/3038]
4967 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4968 * [Don't parse the home directory more than once][cargo/3078]
4969 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4970 * [Update OpenSSL to 1.0.2j][cargo/3121]
4971 * [Add license and license_file to cargo metadata output][cargo/3110]
4972 * [Make crates-io registry URL optional in config; ignore all changes to
4973 source.crates-io][cargo/3089]
4974 * [Don't download dependencies from other platforms][cargo/3123]
4975 * [Build transitive dev-dependencies when needed][cargo/3125]
4976 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4977 * [Avoid updating registry when adding existing deps][cargo/3144]
4978 * [Warn about path overrides that won't work][cargo/3136]
4979 * [Use workspaces during `cargo install`][cargo/3146]
4980 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4981 * [Add --message-format flag][cargo/3000]
4982 * [Pass target environment for rustdoc][cargo/3205]
4983 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4984 * [Update curl and curl-sys][cargo/3241]
4985 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4990 * [rustdoc: Add the `--sysroot` argument][36586]
4991 * [rustdoc: Fix a couple of issues with the search results][35655]
4992 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4993 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4994 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4999 * [Remove unmaintained style guide][35124]
5000 * [Add s390x support][36369]
5001 * [Initial work at Haiku OS support][36727]
5002 * [Add mips-uclibc targets][35734]
5003 * [Crate-ify compiler-rt into compiler-builtins][35021]
5004 * [Add rustc version info (git hash + date) to dist tarball][36213]
5005 * Many documentation improvements
5010 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5011 * [Deny (by default) transmuting from fn item types to pointer-sized
5012 types][34923]. Continuing the long transition to zero-sized fn items,
5014 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5016 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5017 * [Fix lifetime rules for 'if' conditions][36029].
5018 * [Inherit overflow checks for sum and product][36372].
5019 * [Forbid user-defined macros named "macro_rules"][36730].
5021 [33922]: https://github.com/rust-lang/rust/pull/33922
5022 [34623]: https://github.com/rust-lang/rust/pull/34623
5023 [34923]: https://github.com/rust-lang/rust/pull/34923
5024 [34942]: https://github.com/rust-lang/rust/pull/34942
5025 [34982]: https://github.com/rust-lang/rust/pull/34982
5026 [35021]: https://github.com/rust-lang/rust/pull/35021
5027 [35048]: https://github.com/rust-lang/rust/pull/35048
5028 [35074]: https://github.com/rust-lang/rust/pull/35074
5029 [35124]: https://github.com/rust-lang/rust/pull/35124
5030 [35234]: https://github.com/rust-lang/rust/pull/35234
5031 [35238]: https://github.com/rust-lang/rust/pull/35238
5032 [35354]: https://github.com/rust-lang/rust/pull/35354
5033 [35559]: https://github.com/rust-lang/rust/pull/35559
5034 [35585]: https://github.com/rust-lang/rust/pull/35585
5035 [35627]: https://github.com/rust-lang/rust/pull/35627
5036 [35655]: https://github.com/rust-lang/rust/pull/35655
5037 [35702]: https://github.com/rust-lang/rust/pull/35702
5038 [35707]: https://github.com/rust-lang/rust/pull/35707
5039 [35728]: https://github.com/rust-lang/rust/pull/35728
5040 [35734]: https://github.com/rust-lang/rust/pull/35734
5041 [35755]: https://github.com/rust-lang/rust/pull/35755
5042 [35761]: https://github.com/rust-lang/rust/pull/35761
5043 [35764]: https://github.com/rust-lang/rust/pull/35764
5044 [35814]: https://github.com/rust-lang/rust/pull/35814
5045 [35854]: https://github.com/rust-lang/rust/pull/35854
5046 [35871]: https://github.com/rust-lang/rust/pull/35871
5047 [35884]: https://github.com/rust-lang/rust/pull/35884
5048 [35911]: https://github.com/rust-lang/rust/pull/35911
5049 [35969]: https://github.com/rust-lang/rust/pull/35969
5050 [35975]: https://github.com/rust-lang/rust/pull/35975
5051 [36004]: https://github.com/rust-lang/rust/pull/36004
5052 [36008]: https://github.com/rust-lang/rust/pull/36008
5053 [36014]: https://github.com/rust-lang/rust/pull/36014
5054 [36029]: https://github.com/rust-lang/rust/pull/36029
5055 [36059]: https://github.com/rust-lang/rust/pull/36059
5056 [36072]: https://github.com/rust-lang/rust/pull/36072
5057 [36101]: https://github.com/rust-lang/rust/pull/36101
5058 [36104]: https://github.com/rust-lang/rust/pull/36104
5059 [36171]: https://github.com/rust-lang/rust/pull/36171
5060 [36173]: https://github.com/rust-lang/rust/pull/36173
5061 [36178]: https://github.com/rust-lang/rust/pull/36178
5062 [36213]: https://github.com/rust-lang/rust/pull/36213
5063 [36214]: https://github.com/rust-lang/rust/pull/36214
5064 [36264]: https://github.com/rust-lang/rust/pull/36264
5065 [36266]: https://github.com/rust-lang/rust/pull/36266
5066 [36289]: https://github.com/rust-lang/rust/pull/36289
5067 [36338]: https://github.com/rust-lang/rust/pull/36338
5068 [36351]: https://github.com/rust-lang/rust/pull/36351
5069 [36355]: https://github.com/rust-lang/rust/pull/36355
5070 [36369]: https://github.com/rust-lang/rust/pull/36369
5071 [36372]: https://github.com/rust-lang/rust/pull/36372
5072 [36423]: https://github.com/rust-lang/rust/pull/36423
5073 [36482]: https://github.com/rust-lang/rust/pull/36482
5074 [36505]: https://github.com/rust-lang/rust/pull/36505
5075 [36524]: https://github.com/rust-lang/rust/pull/36524
5076 [36527]: https://github.com/rust-lang/rust/pull/36527
5077 [36551]: https://github.com/rust-lang/rust/pull/36551
5078 [36574]: https://github.com/rust-lang/rust/pull/36574
5079 [36586]: https://github.com/rust-lang/rust/pull/36586
5080 [36592]: https://github.com/rust-lang/rust/pull/36592
5081 [36631]: https://github.com/rust-lang/rust/pull/36631
5082 [36639]: https://github.com/rust-lang/rust/pull/36639
5083 [36721]: https://github.com/rust-lang/rust/pull/36721
5084 [36727]: https://github.com/rust-lang/rust/pull/36727
5085 [36730]: https://github.com/rust-lang/rust/pull/36730
5086 [36734]: https://github.com/rust-lang/rust/pull/36734
5087 [36754]: https://github.com/rust-lang/rust/pull/36754
5088 [36995]: https://github.com/rust-lang/rust/pull/36995
5089 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5090 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5091 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5092 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5093 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5094 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5095 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5096 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5097 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5098 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5099 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5100 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5101 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5102 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5103 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5104 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5105 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5106 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5107 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5108 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5109 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5110 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5111 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5112 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5113 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5114 [rustup]: https://www.rustup.rs
5115 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5116 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5117 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5118 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5119 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5120 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5121 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5124 Version 1.12.1 (2016-10-20)
5125 ===========================
5130 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5131 * [Confusion with double negation and booleans][36856]
5132 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5133 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5134 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5135 * [Corrupted memory after updated to 1.12][36936]
5136 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5137 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5138 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5140 [36381]: https://github.com/rust-lang/rust/issues/36381
5141 [36856]: https://github.com/rust-lang/rust/issues/36856
5142 [36875]: https://github.com/rust-lang/rust/issues/36875
5143 [36924]: https://github.com/rust-lang/rust/issues/36924
5144 [36926]: https://github.com/rust-lang/rust/issues/36926
5145 [36936]: https://github.com/rust-lang/rust/issues/36936
5146 [37026]: https://github.com/rust-lang/rust/issues/37026
5147 [37112]: https://github.com/rust-lang/rust/issues/37112
5148 [37153]: https://github.com/rust-lang/rust/issues/37153
5151 Version 1.12.0 (2016-09-29)
5152 ===========================
5157 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5158 This translation pass is far simpler than the previous AST->LLVM pass, and
5159 creates opportunities to perform new optimizations directly on the MIR. It
5160 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5161 * [`rustc` presents a new, more readable error format, along with
5162 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5163 Most common editors supporting Rust have been updated to work with it. It was
5164 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5169 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5170 This translation pass is far simpler than the previous AST->LLVM pass, and
5171 creates opportunities to perform new optimizations directly on the MIR. It
5172 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5173 * [Print the Rust target name, not the LLVM target name, with
5174 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5175 * [The computation of `TypeId` is correct in some cases where it was previously
5176 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5177 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5178 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5179 `--print relocation-models`, and `--print code-models` print the available
5180 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5181 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5182 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5183 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5184 These targets produce statically-linked binaries. There are no binary release
5190 * [`rustc` presents a new, more readable error format, along with
5191 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5192 Most common editors supporting Rust have been updated to work with it. It was
5193 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5194 * [In error descriptions, references are now described in plain English,
5195 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5196 * [In error type descriptions, unknown numeric types are named `{integer}` or
5197 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5198 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5203 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5204 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5205 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5206 useful](https://github.com/rust-lang/rust/pull/34908)
5207 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5208 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5209 * [Semicolons are properly required as statement delimiters inside
5210 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5211 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5216 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5217 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5218 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5219 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5220 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5221 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5222 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5223 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5224 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5225 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5226 Both on Unix and Windows.
5227 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5228 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5229 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5230 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5231 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5232 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5233 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5234 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5239 * [The `format!` macro and friends now allow a single argument to be formatted
5240 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5241 * [The lifetime bounds on `[T]::binary_search_by` and
5242 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5243 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5244 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5245 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5246 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5247 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5248 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5249 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5250 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5251 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5252 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5253 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5254 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5255 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5256 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5257 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5258 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5259 * [`mpsc::sync_channel` `Receiver`s return any available message before
5260 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5261 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5262 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5267 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5268 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5269 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5270 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5271 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5272 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5273 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5274 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5275 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5276 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5277 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5278 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5279 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5280 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5281 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5282 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5287 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5288 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5293 * [Test binaries now support a `--test-threads` argument to specify the number
5294 of threads used to run tests, and which acts the same as the
5295 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5296 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5297 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5298 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5299 * [Rust releases now come with source packages that can be installed by rustup
5300 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5301 The resulting source code can be used by tools and IDES, located in the
5302 sysroot under `lib/rustlib/src`.
5307 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5308 * Many minor improvements to the documentation.
5309 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5314 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5315 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5316 * [When formatting strings, if "precision" is specified, the "fill",
5317 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5318 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5321 Version 1.11.0 (2016-08-18)
5322 ===========================
5327 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5328 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5329 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5330 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5335 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5336 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5337 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5338 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5339 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5340 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5341 (in libcore - previously stabilized in libstd)
5342 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5343 (in libcore - previously stabilized in libstd)
5344 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5345 (in libcore - previously stabilized in libstd)
5346 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5347 (in libcore - previously stabilized in libstd)
5348 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5349 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5350 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5351 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5356 * [The `thread_local!` macro supports multiple definitions in a single
5357 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5358 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5359 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5360 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5361 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5362 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5363 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5364 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5369 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5370 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5371 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5372 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5373 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5374 and `-vv` prints warnings for all crates.
5375 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5376 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5377 This provides room for expansion by arbitrary tools.
5378 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5379 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5380 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5381 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5382 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5383 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5384 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5389 * [Caching projections speeds up type check dramatically for some
5390 workloads](https://github.com/rust-lang/rust/pull/33816)
5391 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5392 This hasher is faster, but is believed to provide sufficient
5393 protection from collision attacks.
5394 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5399 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5400 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5401 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5402 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5403 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5408 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5409 * [When emitting debug info, rustc emits frame pointers for closures,
5410 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5411 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5412 * Many more errors have been given error codes and extended
5414 * API documentation continues to be improved, with many new examples
5419 * [rustc no longer hangs when dependencies recursively re-export
5420 submodules](https://github.com/rust-lang/rust/pull/34542)
5421 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5422 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5423 rewritten](https://github.com/rust-lang/rust/pull/33895)
5424 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5425 No targets use this yet, but it works toward AVR support.
5430 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5431 * [The new follow-set rules that place restrictions on `macro_rules!`
5432 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5433 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5434 and has been a warning since 1.10.
5435 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5436 This causes breakage in some corner cases.
5439 Version 1.10.0 (2016-07-07)
5440 ===========================
5445 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5446 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5447 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5448 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5449 * [`panic!` can be converted to a runtime abort with the
5450 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5451 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5452 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5453 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5454 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5455 Note that Cargo does not yet directly support cdylibs.
5460 * `os::windows::fs::OpenOptionsExt::access_mode`
5461 * `os::windows::fs::OpenOptionsExt::share_mode`
5462 * `os::windows::fs::OpenOptionsExt::custom_flags`
5463 * `os::windows::fs::OpenOptionsExt::attributes`
5464 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5465 * `os::unix::fs::OpenOptionsExt::custom_flags`
5466 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5467 * `Default for sync::Weak`
5468 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5469 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5470 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5471 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5472 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5473 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5474 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5475 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5476 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5477 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5478 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5479 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5480 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5481 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5482 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5483 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5484 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5485 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5486 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5487 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5488 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5489 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5490 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5491 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5492 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5493 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5494 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5495 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5496 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5497 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5498 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5499 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5500 * Read/Write/RawFd impls for `UnixStream`
5501 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5502 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5503 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5504 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5505 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5506 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5507 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5508 * RawFd impls for `UnixListener`
5509 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5510 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5511 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5512 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5513 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5514 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5515 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5516 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5517 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5518 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5519 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5520 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5521 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5522 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5523 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5524 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5525 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5526 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5527 * RawFd impls for `UnixDatagram`
5528 * `{BTree,Hash}Map::values_mut`
5529 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5534 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5535 The semantics of this minor method are subtle and probably not what
5537 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5538 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5539 will fall back to `/dev/urandom` temporarily to avoid blocking
5540 during early boot](https://github.com/rust-lang/rust/pull/33086).
5541 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5542 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5543 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5544 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5545 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5546 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5547 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5551 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5552 This controls the runtime behavior of the `panic!` macro
5553 and can be either "unwind" (the default), or "abort".
5554 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5555 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5556 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5557 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5558 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5559 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5560 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5561 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5562 By default they are retried twice, which can be customized with the
5563 `net.retry` value in `.cargo/config`.
5564 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5565 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5566 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5567 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5568 Makes it possible to install multiple crates in parallel.
5569 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5570 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5571 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5572 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5573 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5574 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5579 * [rustc memory usage was reduced by refactoring the context used for
5580 type checking](https://github.com/rust-lang/rust/pull/33425).
5581 * [Speed up creation of `HashMap`s by caching the random keys used
5582 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5583 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5584 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5585 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5586 10x faster than the previous lookup tables.
5587 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5592 * Many incremental improvements to documentation and rustdoc.
5593 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5594 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5595 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5596 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5597 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5598 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5599 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5604 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5605 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5606 * [`std` no longer prints backtraces on platforms where the running
5607 module must be loaded with `env::current_exe`, which can't be relied
5608 on](https://github.com/rust-lang/rust/pull/33554).
5609 * This release includes std binaries for the i586-unknown-linux-gnu,
5610 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5611 i586 target is for old x86 hardware without SSE2, and the armv7
5612 target is for Android running on modern ARM architectures.
5613 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5614 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5615 * [On Unix the runtime aborts by calling `libc::abort` instead of
5616 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5617 * [Rust is now bootstrapped from the previous release of Rust,
5618 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5623 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5624 * [`target_env` for Linux ARM targets is just `gnu`, not
5625 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5626 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5627 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5628 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5629 Affects how macros are parsed.
5630 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5631 * [Feature-gated attributes on macro-generated macro invocations are
5632 now rejected](https://github.com/rust-lang/rust/pull/32791).
5633 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5634 This caused some minor changes to type inference.
5637 Version 1.9.0 (2016-05-26)
5638 ==========================
5643 * The `#[deprecated]` attribute when applied to an API will generate
5644 warnings when used. The warnings may be suppressed with
5645 `#[allow(deprecated)]`. [RFC 1270].
5646 * [`fn` item types are zero sized, and each `fn` names a unique
5647 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5648 `transmute` on a `fn` type will generate a warning for a few cycles,
5649 then will be converted to an error.
5650 * [Field and method resolution understand visibility, so private
5651 fields and methods cannot prevent the proper use of public fields
5652 and methods][1.9fv].
5653 * [The parser considers unicode codepoints in the
5654 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5660 * [`std::panic::catch_unwind`] (renamed from `recover`)
5661 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5662 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5663 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5664 * [`str::is_char_boundary`]
5665 * [`<*const T>::as_ref`]
5666 * [`<*mut T>::as_ref`]
5667 * [`<*mut T>::as_mut`]
5668 * [`AsciiExt::make_ascii_uppercase`]
5669 * [`AsciiExt::make_ascii_lowercase`]
5670 * [`char::decode_utf16`]
5671 * [`char::DecodeUtf16`]
5672 * [`char::DecodeUtf16Error`]
5673 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5674 * [`BTreeSet::take`]
5675 * [`BTreeSet::replace`]
5678 * [`HashSet::replace`]
5680 * [`OsString::with_capacity`]
5681 * [`OsString::clear`]
5682 * [`OsString::capacity`]
5683 * [`OsString::reserve`]
5684 * [`OsString::reserve_exact`]
5685 * [`OsStr::is_empty`]
5687 * [`std::os::unix::thread`]
5690 * [`JoinHandleExt::as_pthread_t`]
5691 * [`JoinHandleExt::into_pthread_t`]
5692 * [`HashSet::hasher`]
5693 * [`HashMap::hasher`]
5694 * [`CommandExt::exec`]
5695 * [`File::try_clone`]
5696 * [`SocketAddr::set_ip`]
5697 * [`SocketAddr::set_port`]
5698 * [`SocketAddrV4::set_ip`]
5699 * [`SocketAddrV4::set_port`]
5700 * [`SocketAddrV6::set_ip`]
5701 * [`SocketAddrV6::set_port`]
5702 * [`SocketAddrV6::set_flowinfo`]
5703 * [`SocketAddrV6::set_scope_id`]
5704 * [`slice::copy_from_slice`]
5705 * [`ptr::read_volatile`]
5706 * [`ptr::write_volatile`]
5707 * [`OpenOptions::create_new`]
5708 * [`TcpStream::set_nodelay`]
5709 * [`TcpStream::nodelay`]
5710 * [`TcpStream::set_ttl`]
5711 * [`TcpStream::ttl`]
5712 * [`TcpStream::set_only_v6`]
5713 * [`TcpStream::only_v6`]
5714 * [`TcpStream::take_error`]
5715 * [`TcpStream::set_nonblocking`]
5716 * [`TcpListener::set_ttl`]
5717 * [`TcpListener::ttl`]
5718 * [`TcpListener::set_only_v6`]
5719 * [`TcpListener::only_v6`]
5720 * [`TcpListener::take_error`]
5721 * [`TcpListener::set_nonblocking`]
5722 * [`UdpSocket::set_broadcast`]
5723 * [`UdpSocket::broadcast`]
5724 * [`UdpSocket::set_multicast_loop_v4`]
5725 * [`UdpSocket::multicast_loop_v4`]
5726 * [`UdpSocket::set_multicast_ttl_v4`]
5727 * [`UdpSocket::multicast_ttl_v4`]
5728 * [`UdpSocket::set_multicast_loop_v6`]
5729 * [`UdpSocket::multicast_loop_v6`]
5730 * [`UdpSocket::set_multicast_ttl_v6`]
5731 * [`UdpSocket::multicast_ttl_v6`]
5732 * [`UdpSocket::set_ttl`]
5733 * [`UdpSocket::ttl`]
5734 * [`UdpSocket::set_only_v6`]
5735 * [`UdpSocket::only_v6`]
5736 * [`UdpSocket::join_multicast_v4`]
5737 * [`UdpSocket::join_multicast_v6`]
5738 * [`UdpSocket::leave_multicast_v4`]
5739 * [`UdpSocket::leave_multicast_v6`]
5740 * [`UdpSocket::take_error`]
5741 * [`UdpSocket::connect`]
5742 * [`UdpSocket::send`]
5743 * [`UdpSocket::recv`]
5744 * [`UdpSocket::set_nonblocking`]
5749 * [`std::sync::Once` is poisoned if its initialization function
5751 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5752 * [Most types implement `fmt::Debug`][1.9db].
5753 * [The default buffer size used by `BufReader` and `BufWriter` was
5754 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5755 used by other languages.
5756 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5757 `Duration` additionally implements `*=` and `/=`][1.9ta].
5758 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5759 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5760 * [`Chain` implements `BufRead`][1.9ch].
5761 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5766 * [Cargo can now run concurrently][1.9cc].
5767 * [Top-level overrides allow specific revisions of crates to be
5768 overridden through the entire crate graph][1.9ct]. This is intended
5769 to make upgrades easier for large projects, by allowing crates to be
5770 forked temporarily until they've been upgraded and republished.
5771 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5772 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5773 on the commandline][1.9cf]. `rustc` arguments can also be specified
5774 in the `build.rustflags` configuration key.
5779 * [The time complexity of comparing variables for equivalence during type
5780 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5781 to major compilation time improvement in some scenarios.
5782 * [`ToString` is specialized for `str`, giving it the same performance
5783 as `to_owned`][1.9ts].
5784 * [Spawning processes with `Command::output` no longer creates extra
5786 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5787 for C-like enums][1.9cl].
5792 * [Passing the `--quiet` flag to a test runner will produce
5793 much-abbreviated output][1.9q].
5794 * The Rust Project now publishes std binaries for the
5795 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5796 `i586-pc-windows-msvc` targets.
5801 * [`std::sync::Once` is poisoned if its initialization function
5803 * [It is illegal to define methods with the same name in overlapping
5804 inherent `impl` blocks][1.9sn].
5805 * [`fn` item types are zero sized, and each `fn` names a unique
5806 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5807 `transmute` on a `fn` type will generate a warning for a few cycles,
5808 then will be converted to an error.
5809 * [Improvements to const evaluation may trigger new errors when integer
5810 literals are out of range][1.9ce].
5813 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5814 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5815 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5816 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5817 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5818 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5819 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5820 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5821 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5822 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5823 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5824 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5825 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5826 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5827 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5828 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5829 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5830 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5831 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5832 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5833 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5834 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5835 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5836 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5837 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5838 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5839 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5840 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5841 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5842 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5843 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5844 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5845 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5846 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5847 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5848 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5849 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5850 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5851 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5852 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5853 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5854 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5855 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5856 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5857 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5858 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5859 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5860 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5861 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5862 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5863 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5864 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5865 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5866 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5867 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5868 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5869 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5870 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5871 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5872 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5873 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5874 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5875 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5876 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5877 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5878 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5879 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5880 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5881 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5882 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5883 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5884 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5885 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5886 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5887 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5888 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5889 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5890 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5891 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5892 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5893 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5894 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5895 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5896 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5897 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5898 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5899 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5900 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5901 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5902 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5903 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5904 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5905 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5906 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5907 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5908 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5909 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5910 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5911 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5912 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5913 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5914 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5915 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5916 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5917 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5918 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5919 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5920 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5921 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5922 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5925 Version 1.8.0 (2016-04-14)
5926 ==========================
5931 * Rust supports overloading of compound assignment statements like
5932 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5933 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5934 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5936 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5937 addition to the non-braced form, `struct Foo;`. [RFC 218].
5943 * [`str::encode_utf16`] (renamed from `utf16_units`)
5944 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5947 * [`ptr::drop_in_place`]
5949 * [`time::SystemTime`]
5951 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5952 * [`Instant::elapsed`]
5953 * [`SystemTime::now`]
5954 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5955 * [`SystemTime::elapsed`]
5956 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5957 * [`SystemTimeError`]
5958 * [`SystemTimeError::duration`]
5959 * Various impls for `SystemTimeError`
5961 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5962 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5963 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5964 * [The `write!` and `writeln!` macros correctly emit errors if any of
5965 their arguments can't be formatted][1.8w].
5966 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5967 * [The Unix-specific `raw` modules, which contain a number of
5968 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5969 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5970 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5971 across platforms was making it difficult to implement `std`
5972 correctly. Those that need these definitions should use the `libc`
5974 * The Unix-specific `MetadataExt` traits, including
5975 `os::unix::fs::MetadataExt`, which expose values such as inode
5976 numbers [no longer return platform-specific types][1.8r], but
5977 instead return widened integers. [RFC 1415].
5978 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5979 * [Atomic loads and stores are not volatile][1.8a].
5980 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5985 * [Inlining hash functions lead to a 3% compile-time improvement in
5986 some workloads][1.8h].
5987 * When using jemalloc, its symbols are [unprefixed so that it
5988 overrides the libc malloc implementation][1.8h]. This means that for
5989 rustc, LLVM is now using jemalloc, which results in a 6%
5990 compile-time improvement on a specific workload.
5991 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5996 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5997 i686-pc-windows-msvc is now considered a tier-1 platform.
5998 * [The `--print targets` flag prints a list of supported targets][1.8t].
5999 * [The `--print cfg` flag prints the `cfg`s defined for the current
6001 * [`rustc` can be built with an new Cargo-based build system, written
6002 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6003 build system. To enable it configure with `configure --rustbuild`.
6004 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6005 variants while also indicating the total number of missing variants
6006 if more than 3][1.8m].
6007 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6008 * The Rust Project now publishes binary releases of the standard
6009 library for a number of tier-2 targets:
6010 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6011 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6012 `x86_64-rumprun-netbsd`. These can be installed with
6013 tools such as [multirust][1.8mr].
6018 * [`cargo init` creates a new Cargo project in the current
6019 directory][1.8ci]. It is otherwise like `cargo new`.
6020 * [Cargo has configuration keys for `-v` and
6021 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6022 `[term]` section of `.cargo/config`.
6023 * [Configuration keys that evaluate to strings or integers can be set
6024 via environment variables][1.8ce]. For example the `build.jobs` key
6025 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6026 precedence over config files.
6027 * [Target-specific dependencies support Rust `cfg` syntax for
6028 describing targets][1.8cfg] so that dependencies for multiple
6029 targets can be specified together. [RFC 1361].
6030 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6031 `RUSTDOC` take precedence over the `build.target-dir`,
6032 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6033 * [The child process tree is killed on Windows when Cargo is
6035 * [The `build.target` configuration value sets the target platform,
6036 like `--target`][1.8ct].
6041 * [Unstable compiler flags have been further restricted][1.8u]. Since
6042 1.0 `-Z` flags have been considered unstable, and other flags that
6043 were considered unstable additionally required passing `-Z
6044 unstable-options` to access. Unlike unstable language and library
6045 features though, these options have been accessible on the stable
6046 release channel. Going forward, *new unstable flags will not be
6047 available on the stable release channel*, and old unstable flags
6048 will warn about their usage. In the future, all unstable flags will
6049 be unavailable on the stable release channel.
6050 * [It is no longer possible to `match` on empty enum variants using
6051 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6052 * The Unix-specific `MetadataExt` traits, including
6053 `os::unix::fs::MetadataExt`, which expose values such as inode
6054 numbers [no longer return platform-specific types][1.8r], but
6055 instead return widened integers. [RFC 1415].
6056 * [Modules sourced from the filesystem cannot appear within arbitrary
6057 blocks, but only within other modules][1.8mf].
6058 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6059 * On Unix, [stack overflow triggers a runtime abort instead of a
6061 * [`Command::spawn` and its equivalents return an error if any of
6062 its command-line arguments contain interior `NUL`s][1.8n].
6063 * [Tuple and unit enum variants from other crates are in the type
6065 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6066 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6067 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6068 instead of `foo.lib`.
6071 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6072 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6073 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6074 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6075 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6076 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6077 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6078 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6079 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6080 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6081 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6082 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6083 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6084 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6085 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6086 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6087 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6088 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6089 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6090 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6091 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6092 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6093 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6094 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6095 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6096 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6097 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6098 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6099 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6100 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6101 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6102 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6103 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6104 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6105 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6106 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6107 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6108 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6109 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6110 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6111 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6112 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6113 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6114 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6115 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6116 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6117 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6118 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6119 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6120 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6121 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6122 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6123 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6124 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6125 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6126 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6127 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6128 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6129 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6130 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6133 Version 1.7.0 (2016-03-03)
6134 ==========================
6141 * [`Path::strip_prefix`] (renamed from relative_from)
6142 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6144 * [`Ipv4Addr::is_loopback`]
6145 * [`Ipv4Addr::is_private`]
6146 * [`Ipv4Addr::is_link_local`]
6147 * [`Ipv4Addr::is_multicast`]
6148 * [`Ipv4Addr::is_broadcast`]
6149 * [`Ipv4Addr::is_documentation`]
6151 * [`Ipv6Addr::is_unspecified`]
6152 * [`Ipv6Addr::is_loopback`]
6153 * [`Ipv6Addr::is_multicast`]
6156 * [`Vec::as_mut_slice`]
6158 * [`String::as_str`]
6159 * [`String::as_mut_str`]
6161 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6163 * `<[T]>::`[`sort_by_key`]
6164 * checked, saturated, and overflowing operations
6165 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6166 * [`i32::saturating_mul`]
6167 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6168 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6169 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6170 * [`u32::saturating_mul`]
6171 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6172 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6173 * and checked, saturated, and overflowing operations for other primitive types
6175 * [`ffi::IntoStringError`]
6176 * [`CString::into_string`]
6177 * [`CString::into_bytes`]
6178 * [`CString::into_bytes_with_nul`]
6179 * `From<CString> for Vec<u8>`
6181 * [`IntoStringError::into_cstring`]
6182 * [`IntoStringError::utf8_error`]
6183 * `Error for IntoStringError`
6185 * [`std::hash::BuildHasher`]
6186 * [`BuildHasher::Hasher`]
6187 * [`BuildHasher::build_hasher`]
6188 * [`std::hash::BuildHasherDefault`]
6189 * [`HashMap::with_hasher`]
6190 * [`HashMap::with_capacity_and_hasher`]
6191 * [`HashSet::with_hasher`]
6192 * [`HashSet::with_capacity_and_hasher`]
6193 * [`std::collections::hash_map::RandomState`]
6194 * [`RandomState::new`]
6195 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6196 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6197 from bytes is faster.
6198 * [The performance of `LineWriter` (and thus `io::stdout`) was
6199 improved by using `memchr` to search for newlines][1.7m].
6200 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6201 `f64` variants were stabilized previously.
6202 * [`BTreeMap` was rewritten to use less memory and improve the performance
6203 of insertion and iteration, the latter by as much as 5x][1.7bm].
6204 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6205 covariant over their contained type][1.7bt].
6206 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6207 over their contained type][1.7ll].
6208 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6210 * [`Any` is implemented for unsized types][1.7a].
6211 * [`Hash` is implemented for `Duration`][1.7h].
6216 * [When running tests with `--test`, rustdoc will pass `--cfg`
6217 arguments to the compiler][1.7dt].
6218 * [The compiler is built with RPATH information by default][1.7rpa].
6219 This means that it will be possible to run `rustc` when installed in
6220 unusual configurations without configuring the dynamic linker search
6222 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6223 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6224 over `LD_LIBRARY_PATH`.
6229 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6230 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6231 * [The `rerun-if-changed` build script directive no longer causes the
6232 build script to incorrectly run twice in certain scenarios][1.7rr].
6237 * Soundness fixes to the interactions between associated types and
6238 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6239 code that violates the new rules. This is a significant change that
6240 is known to break existing code, so it has emitted warnings for the
6241 new error cases since 1.4 to give crate authors time to adapt. The
6242 details of what is changing are subtle; read the RFC for more.
6243 * [Several bugs in the compiler's visibility calculations were
6244 fixed][1.7v]. Since this was found to break significant amounts of
6245 code, the new errors will be emitted as warnings for several release
6246 cycles, under the `private_in_public` lint.
6247 * Defaulted type parameters were accidentally accepted in positions
6248 that were not intended. In this release, [defaulted type parameters
6249 appearing outside of type definitions will generate a
6250 warning][1.7d], which will become an error in future releases.
6251 * [Parsing "." as a float results in an error instead of 0][1.7p].
6252 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6253 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6255 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6256 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6257 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6258 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6259 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6260 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6261 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6262 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6263 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6264 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6265 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6266 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6267 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6268 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6269 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6270 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6271 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6272 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6273 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6274 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6275 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6276 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6277 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6278 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6279 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6280 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6281 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6282 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6283 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6284 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6285 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6286 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6287 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6288 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6289 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6290 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6291 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6292 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6293 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6294 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6295 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6296 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6297 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6298 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6299 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6300 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6301 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6302 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6303 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6304 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6305 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6306 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6307 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6308 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6309 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6310 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6311 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6312 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6313 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6314 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6315 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6316 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6317 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6318 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6319 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6320 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6321 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6322 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6323 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6324 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6325 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6326 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6327 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6328 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6329 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6330 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6331 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6332 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6333 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6336 Version 1.6.0 (2016-01-21)
6337 ==========================
6342 * The `#![no_std]` attribute causes a crate to not be linked to the
6343 standard library, but only the [core library][1.6co], as described
6344 in [RFC 1184]. The core library defines common types and traits but
6345 has no platform dependencies whatsoever, and is the basis for Rust
6346 software in environments that cannot support a full port of the
6347 standard library, such as operating systems. Most of the core
6348 library is now stable.
6354 [`Read::read_exact`],
6355 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6356 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6357 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6358 [`os::unix::fs::DirBuilderExt`],
6359 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6360 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6361 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6362 [`collections::hash_map::Drain`],
6363 [`collections::hash_map::HashMap::drain`],
6364 [`collections::hash_set::Drain`],
6365 [`collections::hash_set::HashSet::drain`],
6366 [`collections::binary_heap::Drain`],
6367 [`collections::binary_heap::BinaryHeap::drain`],
6368 [`Vec::extend_from_slice`] (renamed from `push_all`),
6369 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6370 [`RwLock::into_inner`],
6371 [`Iterator::min_by_key`] (renamed from `min_by`),
6372 [`Iterator::max_by_key`] (renamed from `max_by`).
6373 * The [core library][1.6co] is stable, as are most of its APIs.
6374 * [The `assert_eq!` macro supports arguments that don't implement
6375 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6377 * Several timer functions that take duration in milliseconds [are
6378 deprecated in favor of those that take `Duration`][1.6ms]. These
6379 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6380 `thread::park_timeout_ms`.
6381 * The algorithm by which `Vec` reserves additional elements was
6382 [tweaked to not allocate excessive space][1.6a] while still growing
6384 * `From` conversions are [implemented from integers to floats][1.6f]
6385 in cases where the conversion is lossless. Thus they are not
6386 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6387 or `f64`. They are also not implemented for `isize` and `usize`
6388 because the implementations would be platform-specific. `From` is
6389 also implemented from `f32` to `f64`.
6390 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6391 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6392 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6393 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6395 * Sorting slices that are already sorted [is 50% faster in some
6401 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6402 * Cargo build scripts can specify their dependencies by emitting the
6403 [`rerun-if-changed`][1.6rr] key.
6404 * crates.io will reject publication of crates with dependencies that
6405 have a wildcard version constraint. Crates with wildcard
6406 dependencies were seen to cause a variety of problems, as described
6407 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6409 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6410 release folder. A variety of artifacts that Cargo failed to clean
6411 are now correctly deleted.
6416 * The `unreachable_code` lint [warns when a function call's argument
6418 * The parser indicates [failures that may be caused by
6419 confusingly-similar Unicode characters][1.6uc]
6420 * Certain macro errors [are reported at definition time][1.6m], not
6426 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6427 environment variable when locating crates. This was a pre-cargo
6428 feature for integrating with the package manager that was
6429 accidentally never removed.
6430 * [A number of bugs were fixed in the privacy checker][1.6p] that
6431 could cause previously-accepted code to break.
6432 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6433 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6434 struct pattern syntax (`Foo(..)`) can no longer be used to match
6435 unit structs. This is a warning now, but will become an error in
6436 future releases. Patterns that share the same name as a const are
6438 * A bug was fixed that causes [rustc not to apply default type
6439 parameters][1.6xc] when resolving certain method implementations of
6440 traits defined in other crates.
6442 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6443 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6444 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6445 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6446 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6447 [1.6co]: http://doc.rust-lang.org/core/index.html
6448 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6449 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6450 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6451 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6452 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6453 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6454 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6455 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6456 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6457 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6458 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6459 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6460 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6461 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6462 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6463 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6464 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6465 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6466 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6467 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6468 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6469 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6470 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6471 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6472 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6473 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6474 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6475 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6476 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6477 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6478 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6479 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6480 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6481 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6482 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6483 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6484 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6485 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6486 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6487 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6488 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6491 Version 1.5.0 (2015-12-10)
6492 ==========================
6494 * ~700 changes, numerous bugfixes
6500 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6501 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6502 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6503 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6504 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6505 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6506 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6507 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6508 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6509 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6510 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6511 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6512 [`Path::read_link`], [`Path::symlink_metadata`],
6513 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6514 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6515 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6516 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6517 [`slice::split_first_mut`], [`slice::split_first`],
6518 [`slice::split_last_mut`], [`slice::split_last`],
6519 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6520 [`str::MatchIndices`], [`str::RMatchIndices`],
6521 [`str::match_indices`], [`str::rmatch_indices`],
6522 [`str::slice_mut_unchecked`], [`string::ParseError`].
6523 * Rust applications hosted on crates.io can be installed locally to
6524 `~/.cargo/bin` with the [`cargo install`] command. Among other
6525 things this makes it easier to augment Cargo with new subcommands:
6526 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6527 invoked as `cargo foo`.
6528 * Crates with wildcard (`*`) dependencies will [emit warnings when
6529 published][1.5w]. In 1.6 it will no longer be possible to publish
6530 crates with wildcard dependencies.
6535 * The rules determining when a particular lifetime must outlive
6536 a particular value (known as '[dropck]') have been [modified
6537 to not rely on parametricity][1.5p].
6538 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6539 and `Arc`][1.5a]. Because these smart pointer types implement
6540 `Deref`, this causes breakage in cases where the interior type
6541 contains methods of the same name.
6542 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6543 that they could drop their content. Soundness fix.
6544 * All method invocations are [properly checked][1.5wf1] for
6545 [well-formedness][1.5wf2]. Soundness fix.
6546 * Traits whose supertraits contain `Self` are [not object
6547 safe][1.5o]. Soundness fix.
6548 * Target specifications support a [`no_default_libraries`][1.5nd]
6549 setting that controls whether `-nodefaultlibs` is passed to the
6550 linker, and in turn the `is_like_windows` setting no longer affects
6551 the `-nodefaultlibs` flag.
6552 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6553 * The `#[inline]` and `#[repr]` attributes [can only appear
6554 in valid locations][1.5at].
6555 * Native libraries linked from the local crate are [passed to
6556 the linker before native libraries from upstream crates][1.5nl].
6557 * Two rarely-used attributes, `#[no_debug]` and
6558 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6559 * Negation of unsigned integers, which has been a warning for
6560 several releases, [is now behind a feature gate and will
6561 generate errors][1.5nu].
6562 * The parser accidentally accepted visibility modifiers on
6563 enum variants, a bug [which has been fixed][1.5ev].
6564 * [A bug was fixed that allowed `use` statements to import unstable
6570 * When evaluating expressions at compile-time that are not
6571 compile-time constants (const-evaluating expressions in non-const
6572 contexts), incorrect code such as overlong bitshifts and arithmetic
6573 overflow will [generate a warning instead of an error][1.5ce],
6574 delaying the error until runtime. This will allow the
6575 const-evaluator to be expanded in the future backwards-compatibly.
6576 * The `improper_ctypes` lint [no longer warns about using `isize` and
6577 `usize` in FFI][1.5ict].
6582 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6584 * `Default` is [implemented for mutable slices][1.5d].
6585 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6586 * There are now `From` conversions [between floating point
6587 types][1.5f] where the conversions are lossless.
6588 * There are now `From` conversions [between integer types][1.5i] where
6589 the conversions are lossless.
6590 * [`fs::Metadata` implements `Clone`][1.5fs].
6591 * The `parse` method [accepts a leading "+" when parsing
6593 * [`AsMut` is implemented for `Vec`][1.5am].
6594 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6595 been optimized][1.5cf] and no longer rely on the default impl.
6596 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6597 `unsafe extern "C"` function types now [implement `Clone`,
6598 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6599 `fmt::Debug` for up to 12 arguments][1.5fp].
6600 * [Dropping `Vec`s is much faster in unoptimized builds when the
6601 element types don't implement `Drop`][1.5dv].
6602 * A bug that caused in incorrect behavior when [combining `VecDeque`
6603 with zero-sized types][1.5vdz] was resolved.
6604 * [`PartialOrd` for slices is faster][1.5po].
6609 * [Crate metadata size was reduced by 20%][1.5md].
6610 * [Improvements to code generation reduced the size of libcore by 3.3
6611 MB and rustc's memory usage by 18MB][1.5m].
6612 * [Improvements to deref translation increased performance in
6613 unoptimized builds][1.5dr].
6614 * Various errors in trait resolution [are deduplicated to only be
6615 reported once][1.5te].
6616 * Rust has preliminary [support for rumprun kernels][1.5rr].
6617 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6619 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6620 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6621 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6622 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6623 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6624 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6625 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6626 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6627 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6628 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6629 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6630 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6631 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6632 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6633 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6634 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6635 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6636 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6637 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6638 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6639 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6640 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6641 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6642 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6643 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6644 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6645 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6646 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6647 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6648 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6649 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6650 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6651 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6652 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6653 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6654 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6655 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6656 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6657 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6658 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6659 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6660 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6661 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6662 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6663 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6664 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6665 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6666 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6667 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6668 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6669 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6670 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6671 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6672 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6673 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6674 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6675 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6676 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6677 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6678 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6679 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6680 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6681 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6682 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6683 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6684 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6685 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6686 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6687 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6688 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6689 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6690 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6691 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6692 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6693 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6694 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6695 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6696 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6697 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6698 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6699 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6700 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6701 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6702 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6703 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6704 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6705 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6706 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6707 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6709 Version 1.4.0 (2015-10-29)
6710 ==========================
6712 * ~1200 changes, numerous bugfixes
6717 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6718 GNU) are now supported and recommended for use.
6723 * [Several changes have been made to fix type soundness and improve
6724 the behavior of associated types][sound]. See [RFC 1214]. Although
6725 we have mostly introduced these changes as warnings this release, to
6726 become errors next release, there are still some scenarios that will
6727 see immediate breakage.
6728 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6729 line breaks in addition to `\n`][crlf].
6730 * [Loans of `'static` lifetime extend to the end of a function][stat].
6731 * [`str::parse` no longer introduces avoidable rounding error when
6732 parsing floating point numbers. Together with earlier changes to
6733 float formatting/output, "round trips" like f.to_string().parse()
6734 now preserve the value of f exactly. Additionally, leading plus
6735 signs are now accepted][fp3].
6741 * `use` statements that import multiple items [can now rename
6742 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6743 * [Binops work correctly on fat pointers][binfat].
6744 * `pub extern crate`, which does not behave as expected, [issues a
6745 warning][pec] until a better solution is found.
6750 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6751 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6752 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6753 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6754 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6755 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6756 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6757 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6758 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6759 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6760 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6761 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6762 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6763 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6764 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6765 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6766 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6767 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6769 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6770 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6771 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6772 `f64::from_str_radix`.
6773 * [Reverse-searching strings is faster with the 'two-way'
6775 * [`std::io::copy` allows `?Sized` arguments][cc].
6776 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6777 [override `count`, `nth` and `last` with an O(1)
6778 implementation][it].
6779 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6780 * [`IntoRawFd` has been added to the Unix-specific prelude,
6781 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6783 * [`Extend<String>` and `FromIterator<String` are both implemented for
6785 * [`IntoIterator` is implemented for references to `Option` and
6787 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6788 Copy`][ext] as part of [RFC 839]. This will cause type inference
6789 breakage in rare situations.
6790 * [`BinaryHeap` implements `Debug`][bh2].
6791 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6793 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6794 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6795 * [String comparison is faster][faststr].
6796 * `&mut T` where `T: std::fmt::Write` [also implements
6797 `std::fmt::Write`][mutw].
6798 * [A stable regression in `VecDeque::push_back` and other
6799 capacity-altering methods that caused panics for zero-sized types
6801 * [Function pointers implement traits for up to 12 parameters][fp2].
6806 * The compiler [no longer uses the 'morestack' feature to prevent
6807 stack overflow][mm]. Instead it uses guard pages and stack
6808 probes (though stack probes are not yet implemented on any platform
6810 * [The compiler matches traits faster when projections are involved][p].
6811 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6813 * [Cargo now displays useful information about what its doing during
6814 `cargo update`][cu].
6816 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6817 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6818 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6819 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6820 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6821 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6822 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6823 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6824 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6825 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6826 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6827 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6828 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6829 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6830 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6831 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6832 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6833 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6834 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6835 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6836 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6837 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6838 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6839 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6840 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6841 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6842 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6843 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6844 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6845 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6846 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6847 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6848 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6849 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6850 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6851 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6852 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6853 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6854 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6855 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6856 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6857 [bh2]: https://github.com/rust-lang/rust/pull/28156
6858 [binfat]: https://github.com/rust-lang/rust/pull/28270
6859 [bm]: https://github.com/rust-lang/rust/pull/28197
6860 [cc]: https://github.com/rust-lang/rust/pull/27531
6861 [crlf]: https://github.com/rust-lang/rust/pull/28034
6862 [cu]: https://github.com/rust-lang/cargo/pull/1931
6863 [d]: https://github.com/rust-lang/rust/pull/27825
6864 [dep]: https://github.com/rust-lang/rust/pull/28339
6865 [es]: https://github.com/rust-lang/rust/pull/27956
6866 [ext]: https://github.com/rust-lang/rust/pull/28094
6867 [faststr]: https://github.com/rust-lang/rust/pull/28338
6868 [ffi]: https://github.com/rust-lang/rust/pull/28779
6869 [fp]: https://github.com/rust-lang/rust/pull/28268
6870 [fp2]: https://github.com/rust-lang/rust/pull/28560
6871 [fp3]: https://github.com/rust-lang/rust/pull/27307
6872 [i]: https://github.com/rust-lang/rust/pull/27451
6873 [into2]: https://github.com/rust-lang/rust/pull/28039
6874 [it]: https://github.com/rust-lang/rust/pull/27652
6875 [mm]: https://github.com/rust-lang/rust/pull/27338
6876 [mutw]: https://github.com/rust-lang/rust/pull/28368
6877 [sound]: https://github.com/rust-lang/rust/pull/27641
6878 [p]: https://github.com/rust-lang/rust/pull/27866
6879 [pec]: https://github.com/rust-lang/rust/pull/28486
6880 [pr]: https://github.com/rust-lang/rust/pull/27896
6881 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6882 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6883 [s]: https://github.com/rust-lang/rust/pull/27474
6884 [stab]: https://github.com/rust-lang/rust/pull/28339
6885 [stat]: https://github.com/rust-lang/rust/pull/28321
6886 [vd]: https://github.com/rust-lang/rust/pull/28494
6888 Version 1.3.0 (2015-09-17)
6889 ==============================
6891 * ~900 changes, numerous bugfixes
6896 * The [new object lifetime defaults][nold] have been [turned
6897 on][nold2] after a cycle of warnings about the change. Now types
6898 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6899 being interpreted as `&'a Box<Trait+'a>` to `&'a
6900 Box<Trait+'static>`.
6901 * [The Rustonomicon][nom] is a new book in the official documentation
6902 that dives into writing unsafe Rust.
6903 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6904 timekeeping is employed by other std APIs, as well as out-of-tree
6910 * The [new object lifetime defaults][nold] have been [turned
6911 on][nold2] after a cycle of warnings about the change.
6912 * There is a known [regression][lr] in how object lifetime elision is
6913 interpreted, the proper solution for which is undetermined.
6914 * The `#[prelude_import]` attribute, an internal implementation
6915 detail, was accidentally stabilized previously. [It has been put
6916 behind the `prelude_import` feature gate][pi]. This change is
6917 believed to break no existing code.
6918 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6919 [more sane for dynamically sized types][dst3]. Code that relied on
6920 the previous behavior is thought to be broken.
6921 * The `dropck` rules, which checks that destructors can't access
6922 destroyed values, [have been updated][dropck] to match the
6923 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6924 cause some previously-compiling code to no longer build.
6929 * The [new object lifetime defaults][nold] have been [turned
6930 on][nold2] after a cycle of warnings about the change.
6931 * Semicolons may [now follow types and paths in
6932 macros](https://github.com/rust-lang/rust/pull/27000).
6933 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6934 [more sane for dynamically sized types][dst3]. Code that relied on
6935 the previous behavior is not known to exist, and suspected to be
6937 * `'static` variables [may now be recursive][st].
6938 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6939 implementations correctly.
6940 * The `dropck` rules, which checks that destructors can't access
6941 destroyed values, [have been updated][dropck] to match the
6947 * The [`Duration`] API, [has been stabilized][ds], as well as the
6948 `std::time` module, which presently contains only `Duration`.
6949 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6950 * The owned C string, [`CString`], implements [`Borrow`] and the
6951 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6952 these allow C strings to be borrowed and cloned in generic code.
6953 * [`CStr`] implements [`Debug`].
6954 * [`AtomicPtr`] implements [`Debug`].
6955 * [`Error`] trait objects [can be downcast to their concrete types][e]
6956 in many common configurations, using the [`is`], [`downcast`],
6957 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6959 * Searching for substrings now [employs the two-way algorithm][search]
6960 instead of doing a naive search. This gives major speedups to a
6961 number of methods, including [`contains`][sc], [`find`][sf],
6962 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6963 [`ends_with`][sew] are also faster.
6964 * The performance of `PartialEq` for slices is [much faster][ps].
6965 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6966 is overridden and optimized by the implementations for scalars.
6967 * The [`Hasher`] trait now has a number of specialized `write_*`
6968 methods for primitive types, for efficiency.
6969 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6970 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6971 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6972 of [`std::error::Error::cause`][iec] also delegates to the inner
6974 * [`process::Child`][pc] gained the [`id`] method, which returns a
6975 `u32` representing the platform-specific process identifier.
6976 * The [`connect`] method on slices is deprecated, replaced by the new
6977 [`join`] method (note that both of these are on the *unstable*
6978 [`SliceConcatExt`] trait, but through the magic of the prelude are
6979 available to stable code anyway).
6980 * The [`Div`] operator is implemented for [`Wrapping`] types.
6981 * [`DerefMut` is implemented for `String`][dms].
6982 * Performance of SipHash (the default hasher for `HashMap`) is
6983 [better for long data][sh].
6984 * [`AtomicPtr`] implements [`Send`].
6985 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6986 are now [specialized to use uninitialized buffers for increased
6988 * Lifetime parameters of foreign functions [are now resolved
6994 * Rust can now, with some coercion, [produce programs that run on
6995 Windows XP][xp], though XP is not considered a supported platform.
6996 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6997 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6998 recommended for use in 1.3, though should be fully-functional
6999 in the [64-bit 1.4 beta][b14].
7000 * On Fedora-based systems installation will [properly configure the
7001 dynamic linker][fl].
7002 * The compiler gained many new extended error descriptions, which can
7003 be accessed with the `--explain` flag.
7004 * The `dropck` pass, which checks that destructors can't access
7005 destroyed values, [has been rewritten][dropck]. This fixes some
7006 soundness holes, and as such will cause some previously-compiling
7007 code to no longer build.
7008 * `rustc` now uses [LLVM to write archive files where possible][ar].
7009 Eventually this will eliminate the compiler's dependency on the ar
7011 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7012 supported FreeBSD on x86_64).
7013 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7014 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7016 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7017 will kill the process instead of leaking][nlp].
7019 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7020 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7021 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7022 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7023 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7024 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7025 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7026 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7027 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7028 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7029 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7030 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7031 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7032 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7033 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7034 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7035 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7036 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7037 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7038 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7039 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7040 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7041 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7042 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7043 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7044 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7045 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7046 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7047 [ar]: https://github.com/rust-lang/rust/pull/26926
7048 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7049 [dms]: https://github.com/rust-lang/rust/pull/26241
7050 [dropck]: https://github.com/rust-lang/rust/pull/27261
7051 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7052 [ds]: https://github.com/rust-lang/rust/pull/26818
7053 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7054 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7055 [dst3]: https://github.com/rust-lang/rust/pull/27351
7056 [e]: https://github.com/rust-lang/rust/pull/24793
7057 [f]: https://github.com/rust-lang/rust/pull/26588
7058 [fb]: https://github.com/rust-lang/rust/pull/26959
7059 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7060 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7061 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7062 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7063 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7064 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7065 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7066 [lic]: https://github.com/rust-lang/rust/pull/26583
7067 [lnu]: https://github.com/rust-lang/rust/pull/27026
7068 [lr]: https://github.com/rust-lang/rust/issues/27248
7069 [lum]: https://github.com/rust-lang/rust/pull/26378
7070 [lur]: https://github.com/rust-lang/rust/pull/26783
7071 [nlp]: https://github.com/rust-lang/rust/pull/27176
7072 [nold2]: https://github.com/rust-lang/rust/pull/27045
7073 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7074 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7075 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7076 [pi]: https://github.com/rust-lang/rust/pull/26699
7077 [ps]: https://github.com/rust-lang/rust/pull/26884
7078 [rte]: https://github.com/rust-lang/rust/pull/26950
7079 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7080 [search]: https://github.com/rust-lang/rust/pull/26327
7081 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7082 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7083 [sh]: https://github.com/rust-lang/rust/pull/27280
7084 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7085 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7086 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7087 [st]: https://github.com/rust-lang/rust/pull/26630
7088 [win1]: https://github.com/rust-lang/rust/pull/26569
7089 [win2]: https://github.com/rust-lang/rust/pull/26741
7090 [win3]: https://github.com/rust-lang/rust/pull/26741
7091 [win4]: https://github.com/rust-lang/rust/pull/27210
7092 [xp]: https://github.com/rust-lang/rust/pull/26569
7094 Version 1.2.0 (2015-08-07)
7095 ==========================
7097 * ~1200 changes, numerous bugfixes
7102 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7103 like `Rc` to contain types without a fixed size, arrays and trait
7104 objects, finally enabling use of `Rc<[T]>` and completing the
7105 implementation of DST.
7106 * [Parallel codegen][parcodegen] is now working again, which can
7107 substantially speed up large builds in debug mode; It also gets
7108 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7109 jobs). It's not enabled by default, but will be "in the near
7110 future". It can be activated with the `-C codegen-units=N` flag to
7112 * This is the first release with [experimental support for linking
7113 with the MSVC linker and lib C on Windows (instead of using the GNU
7114 variants via MinGW)][win]. It is yet recommended only for the most
7115 intrepid Rustaceans.
7116 * Benchmark compilations are showing a 30% improvement in
7117 bootstrapping over 1.1.
7122 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7123 unicode case mapping, which is a previously-planned change in
7124 behavior and considered a bugfix.
7125 * [`mem::align_of`] now specifies [the *minimum alignment* for
7126 T][align], which is usually the alignment programs are interested
7127 in, and the same value reported by clang's
7128 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7130 * [The `#[packed]` attribute is no longer silently accepted by the
7131 compiler][packed]. This attribute did nothing and code that
7132 mentioned it likely did not work as intended.
7133 * Associated type defaults are [now behind the
7134 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7135 defaults *did not work*, but could be mentioned syntactically. As
7136 such this breakage has minimal impact.
7141 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7142 matching against dereferenceable values.
7147 * The [`Extend`] trait, which grows a collection from an iterator, is
7148 implemented over iterators of references, for `String`, `Vec`,
7149 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7150 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7151 * The [`iter::once`] function returns an iterator that yields a single
7152 element, and [`iter::empty`] returns an iterator that yields no
7154 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7155 over substring matches.
7156 * [`Cell`] and [`RefCell`] both implement `Eq`.
7157 * A number of methods for wrapping arithmetic are added to the
7158 integral types, [`wrapping_div`], [`wrapping_rem`],
7159 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7160 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7161 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7162 type.. It is illegal for the default arithmetic operations in Rust
7163 to overflow; the desire to wrap must be explicit.
7164 * The `{:#?}` formatting specifier [displays the alternate,
7165 pretty-printed][debugfmt] form of the `Debug` formatter. This
7166 feature was actually introduced prior to 1.0 with little
7168 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7169 for writing data to formatted strings, similar to [`io::Write`].
7170 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7171 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7172 are used by code generators to emit implementations of [`Debug`].
7173 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7174 methods that convert case, following Unicode case mapping.
7175 * It is now easier to handle poisoned locks. The [`PoisonError`]
7176 type, returned by failing lock operations, exposes `into_inner`,
7177 `get_ref`, and `get_mut`, which all give access to the inner lock
7178 guard, and allow the poisoned lock to continue to operate. The
7179 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7180 poisoned lock without attempting to take the lock.
7181 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7182 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7183 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7184 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7186 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7192 * `rustc` employs smarter heuristics for guessing at [typos].
7193 * `rustc` emits more efficient code for [no-op conversions between
7194 unsafe pointers][nop].
7195 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7196 resulting in faster compile times and smaller code.
7198 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7199 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7200 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7201 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7202 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7203 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7204 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7205 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7206 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7207 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7208 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7209 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7210 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7211 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7212 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7213 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7214 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7215 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7216 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7217 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7218 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7219 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7220 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7221 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7222 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7223 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7224 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7225 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7226 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7227 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7228 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7229 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7230 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7231 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7232 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7233 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7234 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7235 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7236 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7237 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7238 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7239 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7240 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7241 [align]: https://github.com/rust-lang/rust/pull/25646
7242 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7243 [typos]: https://github.com/rust-lang/rust/pull/26087
7244 [nop]: https://github.com/rust-lang/rust/pull/26336
7245 [fat]: https://github.com/rust-lang/rust/pull/26411
7246 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7247 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7248 [packed]: https://github.com/rust-lang/rust/pull/25541
7249 [ad]: https://github.com/rust-lang/rust/pull/27382
7250 [win]: https://github.com/rust-lang/rust/pull/25350
7252 Version 1.1.0 (2015-06-25)
7253 =========================
7255 * ~850 changes, numerous bugfixes
7260 * The [`std::fs` module has been expanded][fs] to expand the set of
7261 functionality exposed:
7262 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7263 don't incur a syscall on some platforms.
7264 * A `symlink_metadata` function has been added.
7265 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7266 access to all underlying information.
7267 * The compiler now contains extended explanations of many errors. When an error
7268 with an explanation occurs the compiler suggests using the `--explain` flag
7269 to read the explanation. Error explanations are also [available online][err-index].
7270 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7271 well as other work, the time to bootstrap the compiler decreased by
7277 * The [`str::split_whitespace`] method splits a string on unicode
7278 whitespace boundaries.
7279 * On both Windows and Unix, new extension traits provide conversion of
7280 I/O types to and from the underlying system handles. On Unix, these
7281 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7282 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7283 `TcpListener`, and `UpdSocket`. Further implementations for
7284 `std::process` will be stabilized later.
7285 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7286 Windows, symlinks can be created with
7287 `std::os::windows::symlink_dir` and
7288 `std::os::windows::symlink_file`.
7289 * The `mpsc::Receiver` type can now be converted into an iterator with
7290 `into_iter` on the [`IntoIterator`] trait.
7291 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7292 implementation of the [`From`] trait.
7293 * The `Debug` implementation for `RangeFull` [creates output that is
7294 more consistent with other implementations][rf].
7295 * [`Debug` is implemented for `File`][file].
7296 * The `Default` implementation for `Arc` [no longer requires `Sync +
7298 * [The `Iterator` methods `count`, `nth`, and `last` have been
7299 overridden for slices to have O(1) performance instead of O(n)][si].
7300 * Incorrect handling of paths on Windows has been improved in both the
7301 compiler and the standard library.
7302 * [`AtomicPtr` gained a `Default` implementation][ap].
7303 * In accordance with Rust's policy on arithmetic overflow `abs` now
7304 [panics on overflow when debug assertions are enabled][abs].
7305 * The [`Cloned`] iterator, which was accidentally left unstable for
7306 1.0 [has been stabilized][c].
7307 * The [`Incoming`] iterator, which iterates over incoming TCP
7308 connections, and which was accidentally unnamable in 1.0, [is now
7309 properly exported][inc].
7310 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7311 `sift_up` or `sift_down` panic][bh].
7312 * The [`split_off`] method of `LinkedList` [no longer corrupts
7313 the list in certain scenarios][ll].
7318 * Type checking performance [has improved notably][sk] with
7319 [multiple improvements][pre].
7320 * The compiler [suggests code changes][ch] for more errors.
7321 * rustc and it's build system have experimental support for [building
7322 toolchains against MUSL][m] instead of glibc on Linux.
7323 * The compiler defines the `target_env` cfg value, which is used for
7324 distinguishing toolchains that are otherwise for the same
7325 platform. Presently this is set to `gnu` for common GNU Linux
7326 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7327 * The [`cargo rustc`][crc] command invokes a build with custom flags
7329 * [Android executables are always position independent][pie].
7330 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7333 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7334 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7335 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7336 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7337 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7338 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7339 [rf]: https://github.com/rust-lang/rust/pull/24491
7340 [err-index]: https://doc.rust-lang.org/error-index.html
7341 [sk]: https://github.com/rust-lang/rust/pull/24615
7342 [pre]: https://github.com/rust-lang/rust/pull/25323
7343 [file]: https://github.com/rust-lang/rust/pull/24598
7344 [ch]: https://github.com/rust-lang/rust/pull/24683
7345 [arc]: https://github.com/rust-lang/rust/pull/24695
7346 [si]: https://github.com/rust-lang/rust/pull/24701
7347 [ap]: https://github.com/rust-lang/rust/pull/24834
7348 [m]: https://github.com/rust-lang/rust/pull/24777
7349 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7350 [crc]: https://github.com/rust-lang/cargo/pull/1568
7351 [pie]: https://github.com/rust-lang/rust/pull/24953
7352 [abs]: https://github.com/rust-lang/rust/pull/25441
7353 [c]: https://github.com/rust-lang/rust/pull/25496
7354 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7355 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7356 [inc]: https://github.com/rust-lang/rust/pull/25522
7357 [bh]: https://github.com/rust-lang/rust/pull/25856
7358 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7359 [ll]: https://github.com/rust-lang/rust/pull/26022
7360 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7361 [drop]: https://github.com/rust-lang/rust/pull/24935
7363 Version 1.0.0 (2015-05-15)
7364 ========================
7366 * ~1500 changes, numerous bugfixes
7371 * The vast majority of the standard library is now `#[stable]`. It is
7372 no longer possible to use unstable features with a stable build of
7374 * Many popular crates on [crates.io] now work on the stable release
7376 * Arithmetic on basic integer types now [checks for overflow in debug
7382 * Several [restrictions have been added to trait coherence][coh] in
7383 order to make it easier for upstream authors to change traits
7384 without breaking downstream code.
7385 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7386 improve error messages and macro behavior. For example, `0b1234` is
7387 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7388 * Trait bounds [are always invariant][inv], eliminating the need for
7389 the `PhantomFn` and `MarkerTrait` lang items, which have been
7391 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7392 "foo" as bar` syntax has been replaced with `extern crate foo as
7393 bar`, and Cargo now automatically translates "-" in *package* names
7394 to underscore for the crate name.
7395 * [Lifetime shadowing is an error][lt].
7396 * [`Send` no longer implies `'static`][send-rfc].
7397 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7398 `MyType::default()`.
7399 * Primitive types [now have inherent methods][prim-inherent],
7400 obviating the need for extension traits like `SliceExt`.
7401 * Methods with `Self: Sized` in their `where` clause are [considered
7402 object-safe][self-sized], allowing many extension traits like
7403 `IteratorExt` to be merged into the traits they extended.
7404 * You can now [refer to associated types][assoc-where] whose
7405 corresponding trait bounds appear only in a `where` clause.
7406 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7407 like `Send` and `Sync` are now library-defined.
7408 * A [Reflect trait][reflect] was introduced, which means that
7409 downcasting via the `Any` trait is effectively limited to concrete
7410 types. This helps retain the potentially-important "parametricity"
7411 property: generic code cannot behave differently for different type
7412 arguments except in minor ways.
7413 * The `unsafe_destructor` feature is now deprecated in favor of the
7414 [new `dropck`][dropck]. This change is a major reduction in unsafe
7420 * The `thread_local` module [has been renamed to `std::thread`][th].
7421 * The methods of `IteratorExt` [have been moved to the `Iterator`
7423 * Several traits that implement Rust's conventions for type
7424 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7425 [centralized in the `std::convert` module][con].
7426 * The `FromError` trait [was removed in favor of `From`][fe].
7427 * The basic sleep function [has moved to
7428 `std::thread::sleep_ms`][slp].
7429 * The `splitn` function now takes an `n` parameter that represents the
7430 number of items yielded by the returned iterator [instead of the
7431 number of 'splits'][spl].
7432 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7433 * [Derived implementations of `PartialOrd` now order enums according
7434 to their explicitly-assigned discriminants][po].
7435 * [Methods for searching strings are generic over `Pattern`s][pat],
7436 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7438 * [In method resolution, object methods are resolved before inherent
7440 * [`String::from_str` has been deprecated in favor of the `From` impl,
7441 `String::from`][sf].
7442 * [`io::Error` implements `Sync`][ios].
7443 * [The `words` method on `&str` has been replaced with
7444 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7446 * The new path and IO modules are complete and `#[stable]`. This
7447 was the major library focus for this cycle.
7448 * The path API was [revised][path-normalize] to normalize `.`,
7449 adjusting the tradeoffs in favor of the most common usage.
7450 * A large number of remaining APIs in `std` were also stabilized
7451 during this cycle; about 75% of the non-deprecated API surface
7453 * The new [string pattern API][string-pattern] landed, which makes
7454 the string slice API much more internally consistent and flexible.
7455 * A new set of [generic conversion traits][conversion] replaced
7456 many existing ad hoc traits.
7457 * Generic numeric traits were [completely removed][num-traits]. This
7458 was made possible thanks to inherent methods for primitive types,
7459 and the removal gives maximal flexibility for designing a numeric
7460 hierarchy in the future.
7461 * The `Fn` traits are now related via [inheritance][fn-inherit]
7462 and provide ergonomic [blanket implementations][fn-blanket].
7463 * The `Index` and `IndexMut` traits were changed to
7464 [take the index by value][index-value], enabling code like
7465 `hash_map["string"]` to work.
7466 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7467 `Copy` data is known to be `Clone` as well.
7472 * Many errors now have extended explanations that can be accessed with
7473 the `--explain` flag to `rustc`.
7474 * Many new examples have been added to the standard library
7476 * rustdoc has received a number of improvements focused on completion
7478 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7479 * Much headway was made on ecosystem-wide CI, making it possible
7480 to [compare builds for breakage][ci-compare].
7483 [crates.io]: http://crates.io
7484 [clo]: https://github.com/rust-lang/rust/pull/24034
7485 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7486 [con]: https://github.com/rust-lang/rust/pull/23875
7487 [cr]: https://github.com/rust-lang/rust/pull/23419
7488 [fe]: https://github.com/rust-lang/rust/pull/23879
7489 [ie]: https://github.com/rust-lang/rust/pull/23300
7490 [inv]: https://github.com/rust-lang/rust/pull/23938
7491 [ios]: https://github.com/rust-lang/rust/pull/24133
7492 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7493 [lt]: https://github.com/rust-lang/rust/pull/24057
7494 [meth]: https://github.com/rust-lang/rust/pull/24056
7495 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7496 [po]: https://github.com/rust-lang/rust/pull/24270
7497 [sf]: https://github.com/rust-lang/rust/pull/24517
7498 [slp]: https://github.com/rust-lang/rust/pull/23949
7499 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7500 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7501 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7502 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7503 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7504 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7505 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7506 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7507 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7508 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7509 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7510 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7511 [reflect]: https://github.com/rust-lang/rust/pull/23712
7512 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7513 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7514 [index-value]: https://github.com/rust-lang/rust/pull/23601
7515 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7516 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7517 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7518 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7519 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7520 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7523 Version 1.0.0-alpha.2 (2015-02-20)
7524 =====================================
7526 * ~1300 changes, numerous bugfixes
7530 * The various I/O modules were [overhauled][io-rfc] to reduce
7531 unnecessary abstractions and provide better interoperation with
7532 the underlying platform. The old `io` module remains temporarily
7534 * The standard library now [participates in feature gating][feat],
7535 so use of unstable libraries now requires a `#![feature(...)]`
7536 attribute. The impact of this change is [described on the
7537 forum][feat-forum]. [RFC][feat-rfc].
7541 * `for` loops [now operate on the `IntoIterator` trait][into],
7542 which eliminates the need to call `.iter()`, etc. to iterate
7543 over collections. There are some new subtleties to remember
7544 though regarding what sort of iterators various types yield, in
7545 particular that `for foo in bar { }` yields values from a move
7546 iterator, destroying the original collection. [RFC][into-rfc].
7547 * Objects now have [default lifetime bounds][obj], so you don't
7548 have to write `Box<Trait+'static>` when you don't care about
7549 storing references. [RFC][obj-rfc].
7550 * In types that implement `Drop`, [lifetimes must outlive the
7551 value][drop]. This will soon make it possible to safely
7552 implement `Drop` for types where `#[unsafe_destructor]` is now
7553 required. Read the [gorgeous RFC][drop-rfc] for details.
7554 * The fully qualified <T as Trait>::X syntax lets you set the Self
7555 type for a trait method or associated type. [RFC][ufcs-rfc].
7556 * References to types that implement `Deref<U>` now [automatically
7557 coerce to references][deref] to the dereferenced type `U`,
7558 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7559 should eliminate many unsightly uses of `&*`, as when converting
7560 from references to vectors into references to
7561 slices. [RFC][deref-rfc].
7562 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7563 `|:|`) is obsolete and closure kind is inferred from context.
7564 * [`Self` is a keyword][Self].
7568 * The `Show` and `String` formatting traits [have been
7569 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7570 their related purposes. Automatically getting a string
7571 conversion to use with `format!("{:?}", something_to_debug)` is
7572 now written `#[derive(Debug)]`.
7573 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7574 OsStr}`, provide strings in platform-specific encodings for easier
7575 interop with system APIs. [RFC][osstr-rfc].
7576 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7577 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7578 creating raw pointers.
7582 * Certain long error messages of the form 'expected foo found bar'
7583 are now [split neatly across multiple
7584 lines][multiline]. Examples in the PR.
7585 * On Unix Rust can be [uninstalled][un] by running
7586 `/usr/local/lib/rustlib/uninstall.sh`.
7587 * The `#[rustc_on_unimplemented]` attribute, requiring the
7588 'on_unimplemented' feature, lets rustc [display custom error
7589 messages when a trait is expected to be implemented for a type
7594 * Rust is tested against a [LALR grammar][lalr], which parses
7595 almost all the Rust files that rustc does.
7597 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7598 [close]: https://github.com/rust-lang/rust/pull/21843
7599 [deref]: https://github.com/rust-lang/rust/pull/21351
7600 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7601 [drop]: https://github.com/rust-lang/rust/pull/21972
7602 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7603 [feat]: https://github.com/rust-lang/rust/pull/21248
7604 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7605 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7606 [fmt]: https://github.com/rust-lang/rust/pull/21457
7607 [into]: https://github.com/rust-lang/rust/pull/20790
7608 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7609 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7610 [lalr]: https://github.com/rust-lang/rust/pull/21452
7611 [multiline]: https://github.com/rust-lang/rust/pull/19870
7612 [obj]: https://github.com/rust-lang/rust/pull/22230
7613 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7614 [onun]: https://github.com/rust-lang/rust/pull/20889
7615 [osstr]: https://github.com/rust-lang/rust/pull/21488
7616 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7617 [Self]: https://github.com/rust-lang/rust/pull/22158
7618 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7619 [un]: https://github.com/rust-lang/rust/pull/22256
7622 Version 1.0.0-alpha (2015-01-09)
7623 ==================================
7625 * ~2400 changes, numerous bugfixes
7629 * The language itself is considered feature complete for 1.0,
7630 though there will be many usability improvements and bugfixes
7631 before the final release.
7632 * Nearly 50% of the public API surface of the standard library has
7633 been declared 'stable'. Those interfaces are unlikely to change
7635 * The long-running debate over integer types has been
7636 [settled][ints]: Rust will ship with types named `isize` and
7637 `usize`, rather than `int` and `uint`, for pointer-sized
7638 integers. Guidelines will be rolled out during the alpha cycle.
7639 * Most crates that are not `std` have been moved out of the Rust
7640 distribution into the Cargo ecosystem so they can evolve
7641 separately and don't need to be stabilized as quickly, including
7642 'time', 'getopts', 'num', 'regex', and 'term'.
7643 * Documentation continues to be expanded with more API coverage, more
7644 examples, and more in-depth explanations. The guides have been
7645 consolidated into [The Rust Programming Language][trpl].
7646 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7647 * All official Rust binary installers now come with [Cargo], the
7648 Rust package manager.
7652 * Closures have been [completely redesigned][unboxed] to be
7653 implemented in terms of traits, can now be used as generic type
7654 bounds and thus monomorphized and inlined, or via an opaque
7655 pointer (boxed) as in the old system. The new system is often
7656 referred to as 'unboxed' closures.
7657 * Traits now support [associated types][assoc], allowing families
7658 of related types to be defined together and used generically in
7660 * Enum variants are [namespaced by their type names][enum].
7661 * [`where` clauses][where] provide a more versatile and attractive
7662 syntax for specifying generic bounds, though the previous syntax
7664 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7666 * Rust [no longer has a runtime][rt] of any description, and only
7667 supports OS threads, not green threads.
7668 * At long last, Rust has been overhauled for 'dynamically-sized
7669 types' ([DST]), which integrates 'fat pointers' (object types,
7670 arrays, and `str`) more deeply into the type system, making it
7672 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7673 `..j` that produce range types and which, when combined with the
7674 `Index` operator and multidispatch, leads to a convenient slice
7676 * The new range syntax revealed an ambiguity in the fixed-length
7677 array syntax, so now fixed length arrays [are written `[T;
7679 * The `Copy` trait is no longer implemented automatically. Unsafe
7680 pointers no longer implement `Sync` and `Send` so types
7681 containing them don't automatically either. `Sync` and `Send`
7682 are now 'unsafe traits' so one can "forcibly" implement them via
7683 `unsafe impl` if a type confirms to the requirements for them
7684 even though the internals do not (e.g. structs containing unsafe
7685 pointers like `Arc`). These changes are intended to prevent some
7686 footguns and are collectively known as [opt-in built-in
7687 traits][oibit] (though `Sync` and `Send` will soon become pure
7688 library types unknown to the compiler).
7689 * Operator traits now take their operands [by value][ops], and
7690 comparison traits can use multidispatch to compare one type
7691 against multiple other types, allowing e.g. `String` to be
7692 compared with `&str`.
7693 * `if let` and `while let` are no longer feature-gated.
7694 * Rust has adopted a more [uniform syntax for escaping unicode
7695 characters][unicode].
7696 * `macro_rules!` [has been declared stable][mac]. Though it is a
7697 flawed system it is sufficiently popular that it must be usable
7698 for 1.0. Effort has gone into [future-proofing][mac-future] it
7699 in ways that will allow other macro systems to be developed in
7700 parallel, and won't otherwise impact the evolution of the
7702 * The prelude has been [pared back significantly][prelude] such
7703 that it is the minimum necessary to support the most pervasive
7704 code patterns, and through [generalized where clauses][where]
7705 many of the prelude extension traits have been consolidated.
7706 * Rust's rudimentary reflection [has been removed][refl], as it
7707 incurred too much code generation for little benefit.
7708 * [Struct variants][structvars] are no longer feature-gated.
7709 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7710 known as 'higher-ranked trait bounds', this crucially allows
7711 unboxed closures to work.
7712 * Macros invocations surrounded by parens or square brackets and
7713 not terminated by a semicolon are [parsed as
7714 expressions][macros], which makes expressions like `vec![1i32,
7715 2, 3].len()` work as expected.
7716 * Trait objects now implement their traits automatically, and
7717 traits that can be coerced to objects now must be [object
7719 * Automatically deriving traits is now done with `#[derive(...)]`
7720 not `#[deriving(...)]` for [consistency with other naming
7721 conventions][derive].
7722 * Importing the containing module or enum at the same time as
7723 items or variants they contain is [now done with `self` instead
7724 of `mod`][self], as in use `foo::{self, bar}`
7725 * Glob imports are no longer feature-gated.
7726 * The `box` operator and `box` patterns have been feature-gated
7727 pending a redesign. For now unique boxes should be allocated
7728 like other containers, with `Box::new`.
7732 * A [series][coll1] of [efforts][coll2] to establish
7733 [conventions][coll3] for collections types has resulted in API
7734 improvements throughout the standard library.
7735 * New [APIs for error handling][err] provide ergonomic interop
7736 between error types, and [new conventions][err-conv] describe
7737 more clearly the recommended error handling strategies in Rust.
7738 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7739 it is easier to discuss failure in the context of error handling
7740 without making clarifications as to whether you are referring to
7741 the 'fail' macro or failure more generally.
7742 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7743 syscall when available.
7744 * The 'serialize' crate has been renamed 'rustc-serialize' and
7745 moved out of the distribution to Cargo. Although it is widely
7746 used now, it is expected to be superseded in the near future.
7747 * The `Show` formatter, typically implemented with
7748 `#[derive(Show)]` is [now requested with the `{:?}`
7749 specifier][show] and is intended for use by all types, for uses
7750 such as `println!` debugging. The new `String` formatter must be
7751 implemented by hand, uses the `{}` specifier, and is intended
7752 for full-fidelity conversions of things that can logically be
7753 represented as strings.
7757 * [Flexible target specification][flex] allows rustc's code
7758 generation to be configured to support otherwise-unsupported
7760 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7761 respective debuggers with Rust-appropriate pretty-printing.
7762 * The Windows installation of Rust is distributed with the
7763 MinGW components currently required to link binaries on that
7768 * Nullable enum optimizations have been extended to more types so
7769 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7770 space than the inner types themselves.
7771 * Work has begun on supporting AArch64.
7773 [Cargo]: https://crates.io
7774 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7775 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7776 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7777 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7778 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7779 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7780 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7781 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7782 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7783 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7784 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7785 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7786 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7787 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7788 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7789 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7790 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7791 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7792 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7793 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7794 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7795 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7796 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7797 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7798 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7799 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7800 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7801 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7802 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7803 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7804 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7805 [trpl]: https://doc.rust-lang.org/book/index.html
7806 [rbe]: http://rustbyexample.com/
7809 Version 0.12.0 (2014-10-09)
7810 =============================
7812 * ~1900 changes, numerous bugfixes
7816 * The introductory documentation (now called The Rust Guide) has
7817 been completely rewritten, as have a number of supplementary
7819 * Rust's package manager, Cargo, continues to improve and is
7820 sometimes considered to be quite awesome.
7821 * Many API's in `std` have been reviewed and updated for
7822 consistency with the in-development Rust coding
7823 guidelines. The standard library documentation tracks
7824 stabilization progress.
7825 * Minor libraries have been moved out-of-tree to the rust-lang org
7826 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7827 be installed with Cargo.
7828 * Lifetime elision allows lifetime annotations to be left off of
7829 function declarations in many common scenarios.
7830 * Rust now works on 64-bit Windows.
7833 * Indexing can be overloaded with the `Index` and `IndexMut`
7835 * The `if let` construct takes a branch only if the `let` pattern
7836 matches, currently behind the 'if_let' feature gate.
7837 * 'where clauses', a more flexible syntax for specifying trait
7838 bounds that is more aesthetic, have been added for traits and
7839 free functions. Where clauses will in the future make it
7840 possible to constrain associated types, which would be
7841 impossible with the existing syntax.
7842 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7843 the 'slicing_syntax' feature gate, and can be overloaded with
7844 the `Slice` or `SliceMut` traits.
7845 * The syntax for matching of sub-slices has been changed to use a
7846 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7847 consistency with other uses of `..` and to future-proof
7848 potential additional uses of the syntax.
7849 * The syntax for matching inclusive ranges in patterns has changed
7850 from `0..3` to `0...4` to be consistent with the exclusive range
7852 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7853 c]`) has been put behind the 'advanced_slice_patterns' feature
7854 gate and may be removed in the future.
7855 * Components of tuples and tuple structs can be extracted using
7856 the `value.0` syntax, currently behind the `tuple_indexing`
7858 * The `#[crate_id]` attribute is no longer supported; versioning
7859 is handled by the package manager.
7860 * Renaming crate imports are now written `extern crate foo as bar`
7861 instead of `extern crate bar = foo`.
7862 * Renaming use statements are now written `use foo as bar` instead
7864 * `let` and `match` bindings and argument names in macros are now
7866 * The new, more efficient, closure types ('unboxed closures') have
7867 been added under a feature gate, 'unboxed_closures'. These will
7868 soon replace the existing closure types, once higher-ranked
7869 trait lifetimes are added to the language.
7870 * `move` has been added as a keyword, for indicating closures
7871 that capture by value.
7872 * Mutation and assignment is no longer allowed in pattern guards.
7873 * Generic structs and enums can now have trait bounds.
7874 * The `Share` trait is now called `Sync` to free up the term
7875 'shared' to refer to 'shared reference' (the default reference
7877 * Dynamically-sized types have been mostly implemented,
7878 unifying the behavior of fat-pointer types with the rest of the
7880 * As part of dynamically-sized types, the `Sized` trait has been
7881 introduced, which qualifying types implement by default, and
7882 which type parameters expect by default. To specify that a type
7883 parameter does not need to be sized, write `<Sized? T>`. Most
7884 types are `Sized`, notable exceptions being unsized arrays
7885 (`[T]`) and trait types.
7886 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7887 * Lifetime bounds can now be applied to type parameters and object
7889 * The old, reference counted GC type, `Gc<T>` which was once
7890 denoted by the `@` sigil, has finally been removed. GC will be
7891 revisited in the future.
7894 * Library documentation has been improved for a number of modules.
7895 * Bit-vectors, collections::bitv has been modernized.
7896 * The url crate is deprecated in favor of
7897 http://github.com/servo/rust-url, which can be installed with
7899 * Most I/O stream types can be cloned and subsequently closed from
7901 * A `std::time::Duration` type has been added for use in I/O
7902 methods that rely on timers, as well as in the 'time' crate's
7903 `Timespec` arithmetic.
7904 * The runtime I/O abstraction layer that enabled the green thread
7905 scheduler to do non-thread-blocking I/O has been removed, along
7906 with the libuv-based implementation employed by the green thread
7907 scheduler. This will greatly simplify the future I/O work.
7908 * `collections::btree` has been rewritten to have a more
7909 idiomatic and efficient design.
7912 * rustdoc output now indicates the stability levels of API's.
7913 * The `--crate-name` flag can specify the name of the crate
7914 being compiled, like `#[crate_name]`.
7915 * The `-C metadata` specifies additional metadata to hash into
7916 symbol names, and `-C extra-filename` specifies additional
7917 information to put into the output filename, for use by the
7918 package manager for versioning.
7919 * debug info generation has continued to improve and should be
7920 more reliable under both gdb and lldb.
7921 * rustc has experimental support for compiling in parallel
7922 using the `-C codegen-units` flag.
7923 * rustc no longer encodes rpath information into binaries by
7927 * Stack usage has been optimized with LLVM lifetime annotations.
7928 * Official Rust binaries on Linux are more compatible with older
7929 kernels and distributions, built on CentOS 5.10.
7932 Version 0.11.0 (2014-07-02)
7933 ==========================
7935 * ~1700 changes, numerous bugfixes
7938 * ~[T] has been removed from the language. This type is superseded by
7940 * ~str has been removed from the language. This type is superseded by
7942 * ~T has been removed from the language. This type is superseded by the
7944 * @T has been removed from the language. This type is superseded by the
7945 standard library's std::gc::Gc<T> type.
7946 * Struct fields are now all private by default.
7947 * Vector indices and shift amounts are both required to be a `uint`
7948 instead of any integral type.
7949 * Byte character, byte string, and raw byte string literals are now all
7950 supported by prefixing the normal literal with a `b`.
7951 * Multiple ABIs are no longer allowed in an ABI string
7952 * The syntax for lifetimes on closures/procedures has been tweaked
7953 slightly: `<'a>|A, B|: 'b + K -> T`
7954 * Floating point modulus has been removed from the language; however it
7955 is still provided by a library implementation.
7956 * Private enum variants are now disallowed.
7957 * The `priv` keyword has been removed from the language.
7958 * A closure can no longer be invoked through a &-pointer.
7959 * The `use foo, bar, baz;` syntax has been removed from the language.
7960 * The transmute intrinsic no longer works on type parameters.
7961 * Statics now allow blocks/items in their definition.
7962 * Trait bounds are separated from objects with + instead of : now.
7963 * Objects can no longer be read while they are mutably borrowed.
7964 * The address of a static is now marked as insignificant unless the
7965 #[inline(never)] attribute is placed it.
7966 * The #[unsafe_destructor] attribute is now behind a feature gate.
7967 * Struct literals are no longer allowed in ambiguous positions such as
7968 if, while, match, and for..in.
7969 * Declaration of lang items and intrinsics are now feature-gated by
7971 * Integral literals no longer default to `int`, and floating point
7972 literals no longer default to `f64`. Literals must be suffixed with an
7973 appropriate type if inference cannot determine the type of the
7975 * The Box<T> type is no longer implicitly borrowed to &mut T.
7976 * Procedures are now required to not capture borrowed references.
7979 * The standard library is now a "facade" over a number of underlying
7980 libraries. This means that development on the standard library should
7981 be speedier due to smaller crates, as well as a clearer line between
7983 * A new library, libcore, lives under the standard library's facade
7984 which is Rust's "0-assumption" library, suitable for embedded and
7985 kernel development for example.
7986 * A regex crate has been added to the standard distribution. This crate
7987 includes statically compiled regular expressions.
7988 * The unwrap/unwrap_err methods on Result require a Show bound for
7989 better error messages.
7990 * The return types of the std::comm primitives have been centralized
7991 around the Result type.
7992 * A number of I/O primitives have gained the ability to time out their
7994 * A number of I/O primitives have gained the ability to close their
7995 reading/writing halves to cancel pending operations.
7996 * Reverse iterator methods have been removed in favor of `rev()` on
7997 their forward-iteration counterparts.
7998 * A bitflags! macro has been added to enable easy interop with C and
7999 management of bit flags.
8000 * A debug_assert! macro is now provided which is disabled when
8001 `--cfg ndebug` is passed to the compiler.
8002 * A graphviz crate has been added for creating .dot files.
8003 * The std::cast module has been migrated into std::mem.
8004 * The std::local_data api has been migrated from freestanding functions
8005 to being based on methods.
8006 * The Pod trait has been renamed to Copy.
8007 * jemalloc has been added as the default allocator for types.
8008 * The API for allocating memory has been changed to use proper alignment
8009 and sized deallocation
8010 * Connecting a TcpStream or binding a TcpListener is now based on a
8011 string address and a u16 port. This allows connecting to a hostname as
8013 * The Reader trait now contains a core method, read_at_least(), which
8014 correctly handles many repeated 0-length reads.
8015 * The process-spawning API is now centered around a builder-style
8017 * The :? printing qualifier has been moved from the standard library to
8018 an external libdebug crate.
8019 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8020 have been renamed to Eq/Ord.
8021 * The select/plural methods have been removed from format!. The escapes
8022 for { and } have also changed from \{ and \} to {{ and }},
8024 * The TaskBuilder API has been re-worked to be a true builder, and
8025 extension traits for spawning native/green tasks have been added.
8028 * All breaking changes to the language or libraries now have their
8029 commit message annotated with `[breaking-change]` to allow for easy
8030 discovery of breaking changes.
8031 * The compiler will now try to suggest how to annotate lifetimes if a
8032 lifetime-related error occurs.
8033 * Debug info continues to be improved greatly with general bug fixes and
8034 better support for situations like link time optimization (LTO).
8035 * Usage of syntax extensions when cross-compiling has been fixed.
8036 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8037 -fdata-sections and --gc-sections has been enabled by default
8038 * The compiler is now stricter about where it will load module files
8039 from when a module is declared via `mod foo;`.
8040 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8041 Syntax extensions are now discovered via a "plugin registrar" type
8042 which will be extended in the future to other various plugins.
8043 * Lints have been restructured to allow for dynamically loadable lints.
8044 * A number of rustdoc improvements:
8045 * The HTML output has been visually redesigned.
8046 * Markdown is now powered by hoedown instead of sundown.
8047 * Searching heuristics have been greatly improved.
8048 * The search index has been reduced in size by a great amount.
8049 * Cross-crate documentation via `pub use` has been greatly improved.
8050 * Primitive types are now hyperlinked and documented.
8051 * Documentation has been moved from static.rust-lang.org/doc to
8053 * A new sandbox, play.rust-lang.org, is available for running and
8054 sharing rust code examples on-line.
8055 * Unused attributes are now more robustly warned about.
8056 * The dead_code lint now warns about unused struct fields.
8057 * Cross-compiling to iOS is now supported.
8058 * Cross-compiling to mipsel is now supported.
8059 * Stability attributes are now inherited by default and no longer apply
8060 to intra-crate usage, only inter-crate usage.
8061 * Error message related to non-exhaustive match expressions have been
8065 Version 0.10 (2014-04-03)
8066 =========================
8068 * ~1500 changes, numerous bugfixes
8071 * A new RFC process is now in place for modifying the language.
8072 * Patterns with `@`-pointers have been removed from the language.
8073 * Patterns with unique vectors (`~[T]`) have been removed from the
8075 * Patterns with unique strings (`~str`) have been removed from the
8077 * `@str` has been removed from the language.
8078 * `@[T]` has been removed from the language.
8079 * `@self` has been removed from the language.
8080 * `@Trait` has been removed from the language.
8081 * Headers on `~` allocations which contain `@` boxes inside the type for
8082 reference counting have been removed.
8083 * The semantics around the lifetimes of temporary expressions have changed,
8084 see #3511 and #11585 for more information.
8085 * Cross-crate syntax extensions are now possible, but feature gated. See
8086 #11151 for more information. This includes both `macro_rules!` macros as
8087 well as syntax extensions such as `format!`.
8088 * New lint modes have been added, and older ones have been turned on to be
8090 * Unnecessary parentheses
8093 * Uppercase variables
8094 * Publicly visible private types
8095 * `#[deriving]` with raw pointers
8096 * Unsafe functions can no longer be coerced to closures.
8097 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8098 * The `#[simd]` attribute is now behind a feature gate.
8099 * Visibility is no longer allowed on `extern crate` statements, and
8100 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8101 * Trailing commas are now allowed in argument lists and tuple patterns.
8102 * The `do` keyword has been removed, it is now a reserved keyword.
8103 * Default type parameters have been implemented, but are feature gated.
8104 * Borrowed variables through captures in closures are now considered soundly.
8105 * `extern mod` is now `extern crate`
8106 * The `Freeze` trait has been removed.
8107 * The `Share` trait has been added for types that can be shared among
8109 * Labels in macros are now hygienic.
8110 * Expression/statement macro invocations can be delimited with `{}` now.
8111 * Treatment of types allowed in `static mut` locations has been tweaked.
8112 * The `*` and `.` operators are now overloadable through the `Deref` and
8114 * `~Trait` and `proc` no longer have `Send` bounds by default.
8115 * Partial type hints are now supported with the `_` type marker.
8116 * An `Unsafe` type was introduced for interior mutability. It is now
8117 considered undefined to transmute from `&T` to `&mut T` without using the
8119 * The #[linkage] attribute was implemented for extern statics/functions.
8120 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8121 * `Pod` was renamed to `Copy`.
8124 * The `libextra` library has been removed. It has now been decomposed into
8125 component libraries with smaller and more focused nuggets of
8126 functionality. The full list of libraries can be found on the
8127 documentation index page.
8128 * std: `std::condition` has been removed. All I/O errors are now propagated
8129 through the `Result` type. In order to assist with error handling, a
8130 `try!` macro for unwrapping errors with an early return and a lint for
8131 unused results has been added. See #12039 for more information.
8132 * std: The `vec` module has been renamed to `slice`.
8133 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8134 This will become the only growable vector in the future.
8135 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8136 are now found at `std::io::BufferedReader` instead of
8137 `std::io::buffered::BufferedReader`.
8138 * std: `print` and `println` are no longer in the prelude, the `print!` and
8139 `println!` macros are intended to be used instead.
8140 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8141 attempts to statically prevent cycles.
8142 * std: The standard distribution is adopting the policy of pushing failure
8143 to the user rather than failing in libraries. Many functions (such as
8144 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8145 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8146 deriving mode: `#[deriving(Show)]`.
8147 * std: `ToStr` is now implemented for all types implementing `Show`.
8148 * std: The formatting trait methods now take `&self` instead of `&T`
8149 * std: The `invert()` method on iterators has been renamed to `rev()`
8150 * std: `std::num` has seen a reduction in the genericity of its traits,
8151 consolidating functionality into a few core traits.
8152 * std: Backtraces are now printed on task failure if the environment
8153 variable `RUST_BACKTRACE` is present.
8154 * std: Naming conventions for iterators have been standardized. More details
8155 can be found on the wiki's style guide.
8156 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8157 still implement the function.
8158 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8159 * std: `assert_approx_eq!` has been removed
8160 * std: The `e` and `E` formatting specifiers for floats have been added to
8161 print them in exponential notation.
8162 * std: The `Times` trait has been removed
8163 * std: Indications of variance and opting out of builtin bounds is done
8164 through marker types in `std::kinds::marker` now
8165 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8166 `#[deriving(Hash)]` is now possible.
8167 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8168 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8169 * std: `Chan::new` is now `channel()`.
8170 * std: A new synchronous channel type has been implemented.
8171 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8172 * std: `hashmap` and `trie` have been moved to `libcollections`
8173 * std: `run` has been rolled into `io::process`
8174 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8175 * std: The equality and comparison traits have seen some reorganization.
8176 * std: `rand` has moved to `librand`.
8177 * std: `to_{lower,upper}case` has been implemented for `char`.
8178 * std: Logging has been moved to `liblog`.
8179 * collections: `HashMap` has been rewritten for higher performance and less
8181 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8182 it can be booted manually. The runtime guide has more information and
8184 * native: All I/O functionality except signals has been implemented.
8185 * green: Task spawning with `libgreen` has been optimized with stack caching
8186 and various trimming of code.
8187 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8188 * sync: The `extra::sync` module has been updated to modern rust (and moved
8189 to the `sync` library), tweaking and improving various interfaces while
8190 dropping redundant functionality.
8191 * sync: A new `Barrier` type has been added to the `sync` library.
8192 * sync: An efficient mutex for native and green tasks has been implemented.
8193 * serialize: The `base64` module has seen some improvement. It treats
8194 newlines better, has non-string error values, and has seen general
8196 * fourcc: A `fourcc!` macro was introduced
8197 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8198 hexadecimal literal.
8201 * `rustpkg` has been deprecated and removed from the main repository. Its
8202 replacement, `cargo`, is under development.
8203 * Nightly builds of rust are now available
8204 * The memory usage of rustc has been improved many times throughout this
8206 * The build process supports disabling rpath support for the rustc binary
8208 * Code generation has improved in some cases, giving more information to the
8209 LLVM optimization passes to enable more extensive optimizations.
8210 * Debuginfo compatibility with lldb on OSX has been restored.
8211 * The master branch is now gated on an android bot, making building for
8212 android much more reliable.
8213 * Output flags have been centralized into one `--emit` flag.
8214 * Crate type flags have been centralized into one `--crate-type` flag.
8215 * Codegen flags have been consolidated behind a `-C` flag.
8216 * Linking against outdated crates now has improved error messages.
8217 * Error messages with lifetimes will often suggest how to annotate the
8218 function to fix the error.
8219 * Many more types are documented in the standard library, and new guides
8221 * Many `rustdoc` improvements:
8222 * code blocks are syntax highlighted.
8223 * render standalone markdown files.
8224 * the --test flag tests all code blocks by default.
8225 * exported macros are displayed.
8226 * re-exported types have their documentation inlined at the location of the
8228 * search works across crates that have been rendered to the same output
8232 Version 0.9 (2014-01-09)
8233 ==========================
8235 * ~1800 changes, numerous bugfixes
8238 * The `float` type has been removed. Use `f32` or `f64` instead.
8239 * A new facility for enabling experimental features (feature gating) has
8240 been added, using the crate-level `#[feature(foo)]` attribute.
8241 * Managed boxes (@) are now behind a feature gate
8242 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8243 standard library's `Gc` or `Rc` types instead.
8244 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8245 * Jumping back to the top of a loop is now done with `continue` instead of
8247 * Strings can no longer be mutated through index assignment.
8248 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8249 hash delimiters, as in `r###"foo"###`.
8250 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8252 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8253 * `@fn`s have been removed.
8254 * `do` only works with procs in order to make it obvious what the cost
8256 * Single-element tuple-like structs can no longer be dereferenced to
8257 obtain the inner value. A more comprehensive solution for overloading
8258 the dereference operator will be provided in the future.
8259 * The `#[link(...)]` attribute has been replaced with
8260 `#[crate_id = "name#vers"]`.
8261 * Empty `impl`s must be terminated with empty braces and may not be
8262 terminated with a semicolon.
8263 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8264 no longer has any special meaning.
8265 * The old `fmt!` string formatting macro has been removed.
8266 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8267 `print!` and `println!`.
8268 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8269 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8270 `extern mod foo = "bar"` instead.
8271 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8272 * Macros can have attributes.
8273 * Macros can expand to items with attributes.
8274 * Macros can expand to multiple items.
8275 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8276 * Comments may be nested.
8277 * Values automatically coerce to trait objects they implement, without
8279 * Enum discriminants are no longer an entire word but as small as needed to
8280 contain all the variants. The `repr` attribute can be used to override
8281 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8282 `#[repr(C)]` to match C enums.
8283 * Non-string literals are not allowed in attributes (they never worked).
8284 * The FFI now supports variadic functions.
8285 * Octal numeric literals, as in `0o7777`.
8286 * The `concat!` syntax extension performs compile-time string concatenation.
8287 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8288 removed as Rust no longer uses segmented stacks.
8289 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8290 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8291 not `*`; ignoring remaining fields of a struct is also done with `..`,
8292 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8293 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8294 * `rustc` supports the "system" calling convention, which defaults to the
8295 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8297 * The `type_overflow` lint (default: warn) checks literals for overflow.
8298 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8299 * The `attribute_usage` lint (default: warn) warns about unknown
8301 * The `unknown_features` lint (default: warn) warns about unknown
8303 * The `dead_code` lint (default: warn) checks for dead code.
8304 * Rust libraries can be linked statically to one another
8305 * `#[link_args]` is behind the `link_args` feature gate.
8306 * Native libraries are now linked with `#[link(name = "foo")]`
8307 * Native libraries can be statically linked to a rust crate
8308 (`#[link(name = "foo", kind = "static")]`).
8309 * Native OS X frameworks are now officially supported
8310 (`#[link(name = "foo", kind = "framework")]`).
8311 * The `#[thread_local]` attribute creates thread-local (not task-local)
8312 variables. Currently behind the `thread_local` feature gate.
8313 * The `return` keyword may be used in closures.
8314 * Types that can be copied via a memcpy implement the `Pod` kind.
8315 * The `cfg` attribute can now be used on struct fields and enum variants.
8318 * std: The `option` and `result` API's have been overhauled to make them
8319 simpler, more consistent, and more composable.
8320 * std: The entire `std::io` module has been replaced with one that is
8321 more comprehensive and that properly interfaces with the underlying
8322 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8324 * std: `io::util` contains a number of useful implementations of
8325 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8326 `ZeroReader`, `TeeReader`.
8327 * std: The reference counted pointer type `extra::rc` moved into std.
8328 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8329 just a wrapper around it).
8330 * std: The `Either` type has been removed.
8331 * std: `fmt::Default` can be implemented for any type to provide default
8332 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8333 * std: The `rand` API continues to be tweaked.
8334 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8335 on failure in gdb, is now named `rust_fail`.
8336 * std: The `each_key` and `each_value` methods on `HashMap` have been
8337 replaced by the `keys` and `values` iterators.
8338 * std: Functions dealing with type size and alignment have moved from the
8339 `sys` module to the `mem` module.
8340 * std: The `path` module was written and API changed.
8341 * std: `str::from_utf8` has been changed to cast instead of allocate.
8342 * std: `starts_with` and `ends_with` methods added to vectors via the
8343 `ImmutableEqVector` trait, which is in the prelude.
8344 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8345 if the index is out of bounds.
8346 * std: Task failure no longer propagates between tasks, as the model was
8347 complex, expensive, and incompatible with thread-based tasks.
8348 * std: The `Any` type can be used for dynamic typing.
8349 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8351 * std: Methods that produce iterators generally do not have an `_iter`
8353 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8354 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8355 * std: `util::ignore` renamed to `prelude::drop`.
8356 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8358 * std: `vec::raw` has seen a lot of cleanup and API changes.
8359 * std: The standard library no longer includes any C++ code, and very
8360 minimal C, eliminating the dependency on libstdc++.
8361 * std: Runtime scheduling and I/O functionality has been factored out into
8362 extensible interfaces and is now implemented by two different crates:
8363 libnative, for native threading and I/O; and libgreen, for green threading
8364 and I/O. This paves the way for using the standard library in more limited
8365 embedded environments.
8366 * std: The `comm` module has been rewritten to be much faster, have a
8367 simpler, more consistent API, and to work for both native and green
8369 * std: All libuv dependencies have been moved into the rustuv crate.
8370 * native: New implementations of runtime scheduling on top of OS threads.
8371 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8373 * green: The green thread scheduler and message passing types are almost
8375 * extra: The `flatpipes` module had bitrotted and was removed.
8376 * extra: All crypto functions have been removed and Rust now has a policy of
8377 not reimplementing crypto in the standard library. In the future crypto
8378 will be provided by external crates with bindings to established libraries.
8379 * extra: `c_vec` has been modernized.
8380 * extra: The `sort` module has been removed. Use the `sort` method on
8384 * The `rust` and `rusti` commands have been removed, due to lack of
8386 * `rustdoc` was completely rewritten.
8387 * `rustdoc` can test code examples in documentation.
8388 * `rustpkg` can test packages with the argument, 'test'.
8389 * `rustpkg` supports arbitrary dependencies, including C libraries.
8390 * `rustc`'s support for generating debug info is improved again.
8391 * `rustc` has better error reporting for unbalanced delimiters.
8392 * `rustc`'s JIT support was removed due to bitrot.
8393 * Executables and static libraries can be built with LTO (-Z lto)
8394 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8398 Version 0.8 (2013-09-26)
8399 ============================
8401 * ~2200 changes, numerous bugfixes
8404 * The `for` loop syntax has changed to work with the `Iterator` trait.
8405 * At long last, unwinding works on Windows.
8406 * Default methods are ready for use.
8407 * Many trait inheritance bugs fixed.
8408 * Owned and borrowed trait objects work more reliably.
8409 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8410 * rustc can omit emission of code for the `debug!` macro if it is passed
8412 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8413 for foo.rs, then foo/mod.rs, and will generate an error when both are
8415 * Strings no longer contain trailing nulls. The new `std::c_str` module
8416 provides new mechanisms for converting to C strings.
8417 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8418 * The FFI has been overhauled such that foreign functions are called directly,
8419 instead of through a stack-switching wrapper.
8420 * Calling a foreign function must be done through a Rust function with the
8421 `#[fixed_stack_segment]` attribute.
8422 * The `externfn!` macro can be used to declare both a foreign function and
8423 a `#[fixed_stack_segment]` wrapper at once.
8424 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8425 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8426 * `priv` is disallowed everywhere except for struct fields and enum variants.
8427 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8428 * `ref` bindings in irrefutable patterns work correctly now.
8429 * `char` is now prevented from containing invalid code points.
8430 * Casting to `bool` is no longer allowed.
8431 * `\0` is now accepted as an escape in chars and strings.
8432 * `yield` is a reserved keyword.
8433 * `typeof` is a reserved keyword.
8434 * Crates may be imported by URL with `extern mod foo = "url";`.
8435 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8436 * Static vectors can be initialized with repeating elements,
8437 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8438 * Static structs can be initialized with functional record update,
8439 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8440 * `cfg!` can be used to conditionally execute code based on the crate
8441 configuration, similarly to `#[cfg(...)]`.
8442 * The `unnecessary_qualification` lint detects unneeded module
8443 prefixes (default: allow).
8444 * Arithmetic operations have been implemented on the SIMD types in
8445 `std::unstable::simd`.
8446 * Exchange allocation headers were removed, reducing memory usage.
8447 * `format!` implements a completely new, extensible, and higher-performance
8448 string formatting system. It will replace `fmt!`.
8449 * `print!` and `println!` write formatted strings (using the `format!`
8450 extension) to stdout.
8451 * `write!` and `writeln!` write formatted strings (using the `format!`
8452 extension) to the new Writers in `std::rt::io`.
8453 * The library section in which a function or static is placed may
8454 be specified with `#[link_section = "..."]`.
8455 * The `proto!` syntax extension for defining bounded message protocols
8457 * `macro_rules!` is hygienic for `let` declarations.
8458 * The `#[export_name]` attribute specifies the name of a symbol.
8459 * `unreachable!` can be used to indicate unreachable code, and fails
8463 * std: Transitioned to the new runtime, written in Rust.
8464 * std: Added an experimental I/O library, `rt::io`, based on the new
8466 * std: A new generic `range` function was added to the prelude, replacing
8467 `uint::range` and friends.
8468 * std: `range_rev` no longer exists. Since range is an iterator it can be
8469 reversed with `range(lo, hi).invert()`.
8470 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8471 renamed to `unwrap_or`.
8472 * std: The `iterator` module was renamed to `iter`.
8473 * std: Integral types now support the `checked_add`, `checked_sub`, and
8474 `checked_mul` operations for detecting overflow.
8475 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8477 * std: Methods are standardizing on conventions for casting methods:
8478 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8480 * std: The `CString` type in `c_str` provides new ways to convert to and
8482 * std: `DoubleEndedIterator` can yield elements in two directions.
8483 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8485 * std: `str::from_bytes` renamed to `str::from_utf8`.
8486 * std: `pop_opt` and `shift_opt` methods added to vectors.
8487 * std: The task-local data interface no longer uses @, and keys are
8488 no longer function pointers.
8489 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8490 * std: Added `SharedPort` to `comm`.
8491 * std: `Eq` has a default method for `ne`; only `eq` is required
8493 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8494 is required in implementations.
8495 * std: `is_utf8` performance is improved, impacting many string functions.
8496 * std: `os::MemoryMap` provides cross-platform mmap.
8497 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8498 are not 'in-bounds' are considered undefined.
8499 * std: Many freestanding functions in `vec` removed in favor of methods.
8500 * std: Many freestanding functions on scalar types removed in favor of
8502 * std: Many options to task builders were removed since they don't make
8503 sense in the new scheduler design.
8504 * std: More containers implement `FromIterator` so can be created by the
8506 * std: More complete atomic types in `unstable::atomics`.
8507 * std: `comm::PortSet` removed.
8508 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8509 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8510 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8511 default implementations.
8512 * std: Various `from_str` functions were removed in favor of a generic
8513 `from_str` which is available in the prelude.
8514 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8515 * extra: `dlist`, the doubly-linked list was modernized.
8516 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8517 * extra: Added `glob` module, replacing `std::os::glob`.
8518 * extra: `rope` was removed.
8519 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8520 * extra: `net`, and `timer` were removed. The experimental replacements
8521 are `std::rt::io::net` and `std::rt::io::timer`.
8522 * extra: Iterators implemented for `SmallIntMap`.
8523 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8524 * extra: `SmallIntSet` removed. Use `BitvSet`.
8525 * extra: Performance of JSON parsing greatly improved.
8526 * extra: `semver` updated to SemVer 2.0.0.
8527 * extra: `term` handles more terminals correctly.
8528 * extra: `dbg` module removed.
8529 * extra: `par` module removed.
8530 * extra: `future` was cleaned up, with some method renames.
8531 * extra: Most free functions in `getopts` were converted to methods.
8534 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8535 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8536 similarly to gcc's `--march` flag.
8537 * rustc's performance compiling small crates is much better.
8538 * rustpkg has received many improvements.
8539 * rustpkg supports git tags as package IDs.
8540 * rustpkg builds into target-specific directories so it can be used for
8542 * The number of concurrent test tasks is controlled by the environment
8543 variable RUST_TEST_TASKS.
8544 * The test harness can now report metrics for benchmarks.
8545 * All tools have man pages.
8546 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8547 * The runtime uses jemalloc for allocations.
8548 * Segmented stacks are temporarily disabled as part of the transition to
8549 the new runtime. Stack overflows are possible!
8550 * A new documentation backend, rustdoc_ng, is available for use. It is
8551 still invoked through the normal `rustdoc` command.
8554 Version 0.7 (2013-07-03)
8555 =======================
8557 * ~2000 changes, numerous bugfixes
8560 * `impl`s no longer accept a visibility qualifier. Put them on methods
8562 * The borrow checker has been rewritten with flow-sensitivity, fixing
8563 many bugs and inconveniences.
8564 * The `self` parameter no longer implicitly means `&'self self`,
8565 and can be explicitly marked with a lifetime.
8566 * Overloadable compound operators (`+=`, etc.) have been temporarily
8567 removed due to bugs.
8568 * The `for` loop protocol now requires `for`-iterators to return `bool`
8569 so they compose better.
8570 * The `Durable` trait is replaced with the `'static` bounds.
8571 * Trait default methods work more often.
8572 * Structs with the `#[packed]` attribute have byte alignment and
8573 no padding between fields.
8574 * Type parameters bound by `Copy` must now be copied explicitly with
8576 * It is now illegal to move out of a dereferenced unsafe pointer.
8577 * `Option<~T>` is now represented as a nullable pointer.
8578 * `@mut` does dynamic borrow checks correctly.
8579 * The `main` function is only detected at the topmost level of the crate.
8580 The `#[main]` attribute is still valid anywhere.
8581 * Struct fields may no longer be mutable. Use inherited mutability.
8582 * The `#[no_send]` attribute makes a type that would otherwise be
8584 * The `#[no_freeze]` attribute makes a type that would otherwise be
8586 * Unbounded recursion will abort the process after reaching the limit
8587 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8588 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8589 are never implicitly copyable.
8590 * `#[static_assert]` makes compile-time assertions about static bools.
8591 * At long last, 'argument modes' no longer exist.
8592 * The rarely used `use mod` statement no longer exists.
8595 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8597 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8598 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8600 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8601 and unsuffixed integer literals.
8604 * The `core` crate was renamed to `std`.
8605 * The `std` crate was renamed to `extra`.
8606 * More and improved documentation.
8607 * std: `iterator` module for external iterator objects.
8608 * Many old-style (internal, higher-order function) iterators replaced by
8609 implementations of `Iterator`.
8610 * std: Many old internal vector and string iterators,
8611 incl. `any`, `all`. removed.
8612 * std: The `finalize` method of `Drop` renamed to `drop`.
8613 * std: The `drop` method now takes `&mut self` instead of `&self`.
8614 * std: The prelude no longer re-exports any modules, only types and traits.
8615 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8616 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8617 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8618 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8619 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8620 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8621 * std: Many types implement `Clone`.
8622 * std: `path` type renamed to `Path`.
8623 * std: `mut` module and `Mut` type removed.
8624 * std: Many standalone functions removed in favor of methods and iterators
8625 in `vec`, `str`. In the future methods will also work as functions.
8626 * std: `reinterpret_cast` removed. Use `transmute`.
8627 * std: ascii string handling in `std::ascii`.
8628 * std: `Rand` is implemented for ~/@.
8629 * std: `run` module for spawning processes overhauled.
8630 * std: Various atomic types added to `unstable::atomic`.
8631 * std: Various types implement `Zero`.
8632 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8633 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8634 * std: Added `os::mkdir_recursive`.
8635 * std: Added `os::glob` function performs filesystems globs.
8636 * std: `FuzzyEq` renamed to `ApproxEq`.
8637 * std: `Map` now defines `pop` and `swap` methods.
8638 * std: `Cell` constructors converted to static methods.
8639 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8640 * extra: `flate` module moved from `std` to `extra`.
8641 * extra: `fileinput` module for iterating over a series of files.
8642 * extra: `Complex` number type and `complex` module.
8643 * extra: `Rational` number type and `rational` module.
8644 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8645 * extra: `term` uses terminfo now, is more correct.
8646 * extra: `arc` functions converted to methods.
8647 * extra: Implementation of fixed output size variations of SHA-2.
8650 * `unused_variables` lint mode for unused variables (default: warn).
8651 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8653 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8655 * `dead_assignment` lint mode for unread variables (default: warn).
8656 * `unnecessary_allocation` lint mode detects some heap allocations that are
8657 immediately borrowed so could be written without allocating (default: warn).
8658 * `missing_doc` lint mode (default: allow).
8659 * `unreachable_code` lint mode (default: warn).
8660 * The `rusti` command has been rewritten and a number of bugs addressed.
8661 * rustc outputs in color on more terminals.
8662 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8663 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8664 * Compiling with `-g` will make the binary record information about
8665 dynamic borrowcheck failures for debugging.
8666 * rustdoc has a nicer stylesheet.
8667 * Various improvements to rustdoc.
8668 * Improvements to rustpkg (see the detailed release notes).
8671 Version 0.6 (2013-04-03)
8672 ========================
8674 * ~2100 changes, numerous bugfixes
8677 * The self type parameter in traits is now spelled `Self`
8678 * The `self` parameter in trait and impl methods must now be explicitly
8679 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8680 * Static methods no longer require the `static` keyword and instead
8681 are distinguished by the lack of a `self` parameter
8682 * Replaced the `Durable` trait with the `'static` lifetime
8683 * The old closure type syntax with the trailing sigil has been
8684 removed in favor of the more consistent leading sigil
8685 * `super` is a keyword, and may be prefixed to paths
8686 * Trait bounds are separated with `+` instead of whitespace
8687 * Traits are implemented with `impl Trait for Type`
8688 instead of `impl Type: Trait`
8689 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8690 * The `export` keyword has finally been removed
8691 * The `move` keyword has been removed (see "Semantic changes")
8692 * The interior mutability qualifier on vectors, `[mut T]`, has been
8693 removed. Use `&mut [T]`, etc.
8694 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8695 * `fail` is no longer a keyword. Use `fail!()`
8696 * `assert` is no longer a keyword. Use `assert!()`
8697 * `log` is no longer a keyword. use `debug!`, etc.
8698 * 1-tuples may be represented as `(T,)`
8699 * Struct fields may no longer be `mut`. Use inherited mutability,
8700 `@mut T`, `core::mut` or `core::cell`
8701 * `extern mod { ... }` is no longer valid syntax for foreign
8702 function modules. Use extern blocks: `extern { ... }`
8703 * Newtype enums removed. Use tuple-structs.
8704 * Trait implementations no longer support visibility modifiers
8705 * Pattern matching over vectors improved and expanded
8706 * `const` renamed to `static` to correspond to lifetime name,
8707 and make room for future `static mut` unsafe mutable globals.
8708 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8709 * `Clone` implementations can be automatically generated with
8710 `#[deriving(Clone)]`
8711 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8712 instead of `foo as Bar`.
8713 * Fixed length vector types are now written as `[int, .. 3]`
8714 instead of `[int * 3]`.
8715 * Fixed length vector types can express the length as a constant
8716 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8719 * Types with owned pointers or custom destructors move by default,
8720 eliminating the `move` keyword
8721 * All foreign functions are considered unsafe
8722 * &mut is now unaliasable
8723 * Writes to borrowed @mut pointers are prevented dynamically
8725 * The name of the main function can be customized using #[main]
8726 * The default type of an inferred closure is &fn instead of @fn
8727 * `use` statements may no longer be "chained" - they cannot import
8728 identifiers imported by previous `use` statements
8729 * `use` statements are crate relative, importing from the "top"
8730 of the crate by default. Paths may be prefixed with `super::`
8731 or `self::` to change the search behavior.
8732 * Method visibility is inherited from the implementation declaration
8733 * Structural records have been removed
8734 * Many more types can be used in static items, including enums
8735 'static-lifetime pointers and vectors
8736 * Pattern matching over vectors improved and expanded
8737 * Typechecking of closure types has been overhauled to
8738 improve inference and eliminate unsoundness
8739 * Macros leave scope at the end of modules, unless that module is
8740 tagged with #[macro_escape]
8743 * Added big integers to `std::bigint`
8744 * Removed `core::oldcomm` module
8745 * Added pipe-based `core::comm` module
8746 * Numeric traits have been reorganized under `core::num`
8747 * `vec::slice` finally returns a slice
8748 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8749 * Containers reorganized around traits in `core::container`
8750 * `core::dvec` removed, `~[T]` is a drop-in replacement
8751 * `core::send_map` renamed to `core::hashmap`
8752 * `std::map` removed; replaced with `core::hashmap`
8753 * `std::treemap` reimplemented as an owned balanced tree
8754 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8755 * `core::trie` added as a fast ordered map for integer keys
8756 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8757 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8758 overload the comparison operators, whereas `TotalOrd` is used
8759 by certain container types
8762 * Replaced the 'cargo' package manager with 'rustpkg'
8763 * Added all-purpose 'rust' tool
8764 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8765 * rustc now *attempts* to offer spelling suggestions
8766 * Improved support for ARM and Android
8767 * Preliminary MIPS backend
8768 * Improved foreign function ABI implementation for x86, x86_64
8769 * Various memory usage improvements
8770 * Rust code may be embedded in foreign code under limited circumstances
8771 * Inline assembler supported by new asm!() syntax extension.
8774 Version 0.5 (2012-12-21)
8775 ===========================
8777 * ~900 changes, numerous bugfixes
8780 * Removed `<-` move operator
8781 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8782 * Removed old fixed length vector syntax - `[T]/N`
8783 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8784 * Macros may now expand to items and statements
8785 * `a.b()` is always parsed as a method call, never as a field projection
8786 * `Eq` and `IterBytes` implementations can be automatically generated
8787 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8788 * Removed the special crate language for `.rc` files
8789 * Function arguments may consist of any irrefutable pattern
8792 * `&` and `~` pointers may point to objects
8793 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8794 * Enum variants may be structs
8795 * Destructors can be added to all nominal types with the Drop trait
8796 * Structs and nullary enum variants may be constants
8797 * Values that cannot be implicitly copied are now automatically moved
8798 without writing `move` explicitly
8799 * `&T` may now be coerced to `*T`
8800 * Coercions happen in `let` statements as well as function calls
8801 * `use` statements now take crate-relative paths
8802 * The module and type namespaces have been merged so that static
8803 method names can be resolved under the trait in which they are
8806 * Improved support for language features
8807 * Trait inheritance works in many scenarios
8808 * More support for explicit self arguments in methods - `self`, `&self`
8809 `@self`, and `~self` all generally work as expected
8810 * Static methods work in more situations
8811 * Experimental: Traits may declare default methods for the implementations
8815 * New condition handling system in `core::condition`
8816 * Timsort added to `std::sort`
8817 * New priority queue, `std::priority_queue`
8818 * Pipes for serializable types, `std::flatpipes'
8819 * Serialization overhauled to be trait-based
8820 * Expanded `getopts` definitions
8821 * Moved futures to `std`
8822 * More functions are pure now
8823 * `core::comm` renamed to `oldcomm`. Still deprecated
8824 * `rustdoc` and `cargo` are libraries now
8827 * Added a preliminary REPL, `rusti`
8828 * License changed from MIT to dual MIT/APL2
8831 Version 0.4 (2012-10-15)
8832 ==========================
8834 * ~2000 changes, numerous bugfixes
8837 * All keywords are now strict and may not be used as identifiers anywhere
8838 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8839 'of', 'with', 'to', 'class'.
8840 * Classes are replaced with simpler structs
8841 * Explicit method self types
8842 * `ret` became `return` and `alt` became `match`
8843 * `import` is now `use`; `use is now `extern mod`
8844 * `extern mod { ... }` is now `extern { ... }`
8845 * `use mod` is the recommended way to import modules
8846 * `pub` and `priv` replace deprecated export lists
8847 * The syntax of `match` pattern arms now uses fat arrow (=>)
8848 * `main` no longer accepts an args vector; use `os::args` instead
8851 * Trait implementations are now coherent, ala Haskell typeclasses
8852 * Trait methods may be static
8853 * Argument modes are deprecated
8854 * Borrowed pointers are much more mature and recommended for use
8855 * Strings and vectors in the static region are stored in constant memory
8856 * Typestate was removed
8857 * Resolution rewritten to be more reliable
8858 * Support for 'dual-mode' data structures (freezing and thawing)
8861 * Most binary operators can now be overloaded via the traits in
8863 * `std::net::url` for representing URLs
8864 * Sendable hash maps in `core::send_map`
8865 * `core::task' gained a (currently unsafe) task-local storage API
8868 * An efficient new intertask communication primitive called the pipe,
8869 along with a number of higher-level channel types, in `core::pipes`
8870 * `std::arc`, an atomically reference counted, immutable, shared memory
8872 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8873 * Futures are now based on pipes and sendable
8874 * More robust linked task failure
8875 * Improved task builder API
8878 * Improved error reporting
8879 * Preliminary JIT support
8880 * Preliminary work on precise GC
8881 * Extensive architectural improvements to rustc
8882 * Begun a transition away from buggy C++-based reflection (shape) code to
8883 Rust-based (visitor) code
8884 * All hash functions and tables converted to secure, randomized SipHash
8887 Version 0.3 (2012-07-12)
8888 ========================
8890 * ~1900 changes, numerous bugfixes
8892 * New coding conveniences
8893 * Integer-literal suffix inference
8894 * Per-item control over warnings, errors
8895 * #[cfg(windows)] and #[cfg(unix)] attributes
8896 * Documentation comments
8897 * More compact closure syntax
8898 * 'do' expressions for treating higher-order functions as
8900 * *-patterns (wildcard extended to all constructor fields)
8903 * Name resolution pass and exhaustiveness checker rewritten
8904 * Region pointers and borrow checking supersede alias
8906 * Init-ness checking is now provided by a region-based liveness
8907 pass instead of the typestate pass; same for last-use analysis
8908 * Extensive work on region pointers
8910 * Experimental new language features
8911 * Slices and fixed-size, interior-allocated vectors
8912 * #!-comments for lang versioning, shell execution
8913 * Destructors and iface implementation for classes;
8914 type-parameterized classes and class methods
8915 * 'const' type kind for types that can be used to implement
8916 shared-memory concurrency patterns
8920 * Removal of various obsolete features
8921 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8922 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8924 * Constructs: do-while loops ('do' repurposed), fn binding,
8925 resources (replaced by destructors)
8927 * Compiler reorganization
8928 * Syntax-layer of compiler split into separate crate
8929 * Clang (from LLVM project) integrated into build
8930 * Typechecker split into sub-modules
8933 * New time functions
8934 * Extension methods for many built-in types
8935 * Arc: atomic-refcount read-only / exclusive-use shared cells
8936 * Par: parallel map and search routines
8937 * Extensive work on libuv interface
8938 * Much vector code moved to libraries
8939 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8940 #include, #include_str, #include_bin
8943 * Cargo automatically resolves dependencies
8946 Version 0.2 (2012-03-29)
8947 =========================
8949 * >1500 changes, numerous bugfixes
8951 * New docs and doc tooling
8953 * New port: FreeBSD x86_64
8955 * Compilation model enhancements
8956 * Generics now specialized, multiply instantiated
8957 * Functions now inlined across separate crates
8959 * Scheduling, stack and threading fixes
8960 * Noticeably improved message-passing performance
8961 * Explicit schedulers
8965 * Experimental new language features
8966 * Operator overloading
8970 * Various language extensions
8971 * C-callback function types: 'crust fn ...'
8972 * Infinite-loop construct: 'loop { ... }'
8973 * Shorten 'mutable' to 'mut'
8974 * Required mutable-local qualifier: 'let mut ...'
8975 * Basic glob-exporting: 'export foo::*;'
8976 * Alt now exhaustive, 'alt check' for runtime-checked
8977 * Block-function form of 'for' loop, with 'break' and 'ret'.
8980 * AST quasi-quote syntax extension
8981 * Revived libuv interface
8982 * New modules: core::{future, iter}, std::arena
8983 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8984 * Extensive cleanup, regularization in libstd, libcore
8987 Version 0.1 (2012-01-20)
8988 ===============================
8990 * Most language features work, including:
8991 * Unique pointers, unique closures, move semantics
8992 * Interface-constrained generics
8993 * Static interface dispatch
8995 * Multithread task scheduling
8996 * Typestate predicates
8997 * Failure unwinding, destructors
8998 * Pattern matching and destructuring assignment
8999 * Lightweight block-lambda syntax
9000 * Preliminary macro-by-example
9002 * Compiler works with the following configurations:
9003 * Linux: x86 and x86_64 hosts and targets
9004 * macOS: x86 and x86_64 hosts and targets
9005 * Windows: x86 hosts and targets
9007 * Cross compilation / multi-target configuration supported.
9009 * Preliminary API-documentation and package-management tools included.
9013 * Documentation is incomplete.
9015 * Performance is below intended target.
9017 * Standard library APIs are subject to extensive change, reorganization.
9019 * Language-level versioning is not yet operational - future code will