1 Version 1.45.1 (2020-07-30)
2 ==========================
4 * [Fix const propagation with references.][73613]
5 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
6 * [Avoid spurious implicit region bound.][74509]
7 * [Install clippy on x.py install][74457]
9 [73613]: https://github.com/rust-lang/rust/pull/73613
10 [73078]: https://github.com/rust-lang/rust/issues/73078
11 [74509]: https://github.com/rust-lang/rust/pull/74509
12 [74457]: https://github.com/rust-lang/rust/pull/74457
14 Version 1.45.0 (2020-07-16)
15 ==========================
19 - [Out of range float to int conversions using `as` has been defined as a saturating
20 conversion.][71269] This was previously undefined behaviour, but you can use the
21 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
22 may be desirable in rare performance sensitive situations.
23 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
25 - [Function like procedural macros can now be used in expression, pattern, and statement
26 positions.][68717] This means you can now use a function-like procedural macro
27 anywhere you can use a declarative (`macro_rules!`) macro.
31 - [You can now override individual target features through the `target-feature`
32 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
33 equivalent to `-C target-feature=+avx2,+fma`.
34 - [Added the `force-unwind-tables` flag.][69984] This option allows
35 rustc to always generate unwind tables regardless of panic strategy.
36 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
37 to include LLVM bitcode into generated `rlib`s (this is on by default).
38 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
39 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
40 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
42 \* Refer to Rust's [platform support page][forge-platform-support] for more
43 information on Rust's tiered platform support.
48 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
50 - [`proc_macro::TokenStream` now implements `Default`.][72234]
51 - [You can now use `char` with
52 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
53 a range of codepoints.][72413] E.g.
54 you can now write the following;
60 // Prints "abcdefghijklmnopqrstuvwxyz"
62 - [`OsString` now implements `FromStr`.][71662]
63 - [The `saturating_neg` method has been added to all signed integer primitive
64 types, and the `saturating_abs` method has been added for all integer
65 primitive types.][71886]
66 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
67 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
69 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
70 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
71 integer types.][69813]
72 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
73 integer types.][72324]
74 - [The `fetch_update` method has been added to all atomic integer types.][71843]
79 - [`BTreeMap::remove_entry`]
81 - [`rc::Weak::as_ptr`]
82 - [`rc::Weak::from_raw`]
83 - [`rc::Weak::into_raw`]
84 - [`str::strip_prefix`]
85 - [`str::strip_suffix`]
86 - [`sync::Weak::as_ptr`]
87 - [`sync::Weak::from_raw`]
88 - [`sync::Weak::into_raw`]
89 - [`char::UNICODE_VERSION`]
90 - [`Span::resolved_at`]
91 - [`Span::located_at`]
92 - [`Span::mixed_site`]
93 - [`unix::process::CommandExt::arg0`]
98 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
103 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
104 `~~outdated information~~` becomes "~~outdated information~~".
105 - [Added an emoji to Rustdoc's deprecated API message.][72014]
109 - [Trying to self initialize a static value (that is creating a value using
110 itself) is unsound and now causes a compile error.][71140]
111 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
112 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
113 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
114 previously undocumented and not intended for public use. Rustdoc still provides
115 a non-zero exit code on errors.
116 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
117 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
118 flags while cargo is adding `embed-bitcode` itself. The recommended way to
119 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
120 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
124 - [Make clippy a git subtree instead of a git submodule][70655]
125 - [Unify the undo log of all snapshot types][69464]
127 [71848]: https://github.com/rust-lang/rust/issues/71848/
128 [73420]: https://github.com/rust-lang/rust/issues/73420/
129 [72324]: https://github.com/rust-lang/rust/pull/72324/
130 [71843]: https://github.com/rust-lang/rust/pull/71843/
131 [71886]: https://github.com/rust-lang/rust/pull/71886/
132 [72234]: https://github.com/rust-lang/rust/pull/72234/
133 [72239]: https://github.com/rust-lang/rust/pull/72239/
134 [72397]: https://github.com/rust-lang/rust/pull/72397/
135 [72413]: https://github.com/rust-lang/rust/pull/72413/
136 [72014]: https://github.com/rust-lang/rust/pull/72014/
137 [72062]: https://github.com/rust-lang/rust/pull/72062/
138 [72094]: https://github.com/rust-lang/rust/pull/72094/
139 [72133]: https://github.com/rust-lang/rust/pull/72133/
140 [71900]: https://github.com/rust-lang/rust/pull/71900/
141 [71928]: https://github.com/rust-lang/rust/pull/71928/
142 [71662]: https://github.com/rust-lang/rust/pull/71662/
143 [71716]: https://github.com/rust-lang/rust/pull/71716/
144 [71447]: https://github.com/rust-lang/rust/pull/71447/
145 [71269]: https://github.com/rust-lang/rust/pull/71269/
146 [71095]: https://github.com/rust-lang/rust/pull/71095/
147 [71140]: https://github.com/rust-lang/rust/pull/71140/
148 [70655]: https://github.com/rust-lang/rust/pull/70655/
149 [70705]: https://github.com/rust-lang/rust/pull/70705/
150 [69984]: https://github.com/rust-lang/rust/pull/69984/
151 [69813]: https://github.com/rust-lang/rust/pull/69813/
152 [69464]: https://github.com/rust-lang/rust/pull/69464/
153 [68717]: https://github.com/rust-lang/rust/pull/68717/
154 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
155 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
156 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
157 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
158 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
159 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
160 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
161 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
162 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
163 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
164 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
165 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
166 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
167 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
168 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
169 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
170 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
173 Version 1.44.1 (2020-06-18)
174 ===========================
176 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
177 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
178 * [Fix crashes when finding backtrace on macOS.][71397]
179 * [Clippy applies lint levels into different files.][clippy/5356]
181 [71397]: https://github.com/rust-lang/rust/issues/71397
182 [73078]: https://github.com/rust-lang/rust/issues/73078
183 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
184 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
187 Version 1.44.0 (2020-06-04)
188 ==========================
192 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
193 - [Added the `unused_braces` lint.][70081]
195 **Syntax-only changes**
197 - [Expansion-driven outline module parsing][69838]
202 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
207 These are still rejected semantically, so you will likely receive an error but
208 these changes can be seen and parsed by macros and conditional compilation.
212 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
213 Additionally when in incremental mode rustc defaults to 256 codegen units.
214 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
215 a panic is thrown.][67502]
216 - [Added tier 3\* support for the `aarch64-unknown-none` and
217 `aarch64-unknown-none-softfloat` targets.][68334]
218 - [Added tier 3 support for `arm64-apple-tvos` and
219 `x86_64-apple-tvos` targets.][68191]
224 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
225 `vec![]` to be able to be used in `const` contexts.
226 - [`convert::Infallible` now implements `Hash`.][70281]
227 - [`OsString` now implements `DerefMut` and `IndexMut` returning
228 a `&mut OsStr`.][70048]
229 - [Unicode 13 is now supported.][69929]
230 - [`String` now implements `From<&mut str>`.][69661]
231 - [`IoSlice` now implements `Copy`.][69403]
232 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
233 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
234 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
235 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
236 integer types.][69373]
240 - [`PathBuf::with_capacity`]
241 - [`PathBuf::capacity`]
243 - [`PathBuf::reserve`]
244 - [`PathBuf::reserve_exact`]
245 - [`PathBuf::shrink_to_fit`]
246 - [`f32::to_int_unchecked`]
247 - [`f64::to_int_unchecked`]
248 - [`Layout::align_to`]
249 - [`Layout::pad_to_align`]
255 - [Added the `cargo tree` command which will print a tree graph of
256 your dependencies.][cargo/8062] E.g.
258 mdbook v0.3.2 (/Users/src/rust/mdbook)
260 │ ├── html5ever v0.24.0
262 │ │ │ └── cfg-if v0.1.9
264 │ │ └── markup5ever v0.9.0
265 │ │ ├── log v0.4.8 (*)
267 │ │ │ └── phf_shared v0.7.24
268 │ │ │ ├── siphasher v0.2.3
269 │ │ │ └── unicase v1.4.2
270 │ │ │ [build-dependencies]
271 │ │ │ └── version_check v0.1.5
274 You can also display dependencies on multiple versions of the same crate with
275 `cargo tree -d` (short for `cargo tree --duplicates`).
279 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
280 the version in the sidebar.][69494]
284 - [Rustc now correctly generates static libraries on Windows GNU targets with
285 the `.a` extension, rather than the previous `.lib`.][70937]
286 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
287 - [The `file_name` property in JSON output of macro errors now points the actual
288 source file rather than the previous format of `<NAME macros>`.][70969]
289 **Note:** this may not point to a file that actually exists on the user's system.
290 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
291 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
292 not allow zero initialization such as `NonZeroU8`.][66059] This was
293 previously a warning.
294 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
295 operator has been defined as a saturating operation.][71269] This was previously
296 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
297 continue using the current behaviour, which may be desirable in rare performance
298 sensitive situations.
302 These changes provide no direct user facing benefits, but represent significant
303 improvements to the internals and overall performance of rustc and
306 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
307 - [Replace big JS dict with JSON parsing.][71250]
309 [69373]: https://github.com/rust-lang/rust/pull/69373/
310 [66059]: https://github.com/rust-lang/rust/pull/66059/
311 [68191]: https://github.com/rust-lang/rust/pull/68191/
312 [68899]: https://github.com/rust-lang/rust/pull/68899/
313 [71147]: https://github.com/rust-lang/rust/pull/71147/
314 [71250]: https://github.com/rust-lang/rust/pull/71250/
315 [70937]: https://github.com/rust-lang/rust/pull/70937/
316 [70969]: https://github.com/rust-lang/rust/pull/70969/
317 [70632]: https://github.com/rust-lang/rust/pull/70632/
318 [70281]: https://github.com/rust-lang/rust/pull/70281/
319 [70345]: https://github.com/rust-lang/rust/pull/70345/
320 [70048]: https://github.com/rust-lang/rust/pull/70048/
321 [70081]: https://github.com/rust-lang/rust/pull/70081/
322 [70156]: https://github.com/rust-lang/rust/pull/70156/
323 [71269]: https://github.com/rust-lang/rust/pull/71269/
324 [69838]: https://github.com/rust-lang/rust/pull/69838/
325 [69929]: https://github.com/rust-lang/rust/pull/69929/
326 [69661]: https://github.com/rust-lang/rust/pull/69661/
327 [69778]: https://github.com/rust-lang/rust/pull/69778/
328 [69494]: https://github.com/rust-lang/rust/pull/69494/
329 [69403]: https://github.com/rust-lang/rust/pull/69403/
330 [69033]: https://github.com/rust-lang/rust/pull/69033/
331 [68692]: https://github.com/rust-lang/rust/pull/68692/
332 [68334]: https://github.com/rust-lang/rust/pull/68334/
333 [67502]: https://github.com/rust-lang/rust/pull/67502/
334 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
335 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
336 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
337 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
338 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
339 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
340 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
341 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
342 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
343 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
344 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
345 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
346 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
349 Version 1.43.1 (2020-05-07)
350 ===========================
352 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
353 * [Fixed the stabilization of AVX-512 features.][71473]
354 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
356 [71430]: https://github.com/rust-lang/rust/pull/71430
357 [71473]: https://github.com/rust-lang/rust/issues/71473
358 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
361 Version 1.43.0 (2020-04-23)
362 ==========================
366 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
367 the type inferred correctly.][68129]
368 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
370 **Syntax only changes**
371 - [Allow `type Foo: Ord` syntactically.][69361]
372 - [Fuse associated and extern items up to defaultness.][69194]
373 - [Syntactically allow `self` in all `fn` contexts.][68764]
374 - [Merge `fn` syntax + cleanup item parsing.][68728]
375 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
376 For example, you may now write:
378 macro_rules! mac_trait {
388 These are still rejected *semantically*, so you will likely receive an error but
389 these changes can be seen and parsed by macros and
390 conditional compilation.
395 - [You can now pass multiple lint flags to rustc to override the previous
396 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
397 everything in the `unused` lint group except `unused-variables` which
398 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
399 everything in the `unused` lint group **including** `unused-variables` since
400 the allow flag is specified before the deny flag (and therefore overridden).
401 - [rustc will now prefer your system MinGW libraries over its bundled libraries
402 if they are available on `windows-gnu`.][67429]
403 - [rustc now buffers errors/warnings printed in JSON.][69227]
407 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
408 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
409 respectively.][69538] **Note** These conversions are only available when `N`
411 - [You can now use associated constants on floats and integers directly, rather
412 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
413 `f32::NAN` with no imports.
414 - [`u8::is_ascii` is now `const`.][68984]
415 - [`String` now implements `AsMut<str>`.][68742]
416 - [Added the `primitive` module to `std` and `core`.][67637] This module
417 reexports Rust's primitive types. This is mainly useful in macros
418 where you want avoid these types being shadowed.
419 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
420 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
424 - [`Once::is_completed`]
429 - [`iter::once_with`]
433 - [You can now set config `[profile]`s in your `.cargo/config`, or through
434 your environment.][cargo/7823]
435 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
436 executable path when running integration tests or benchmarks.][cargo/7697]
437 `<name>` is the name of your binary as-is e.g. If you wanted the executable
438 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
442 - [Certain checks in the `const_err` lint were deemed unrelated to const
443 evaluation][69185], and have been moved to the `unconditional_panic` and
444 `arithmetic_overflow` lints.
449 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
450 has been a warning since 1.36.0.
451 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
452 led to some instances being accepted, and now correctly emits a hard error.
454 [69340]: https://github.com/rust-lang/rust/pull/69340
458 These changes provide no direct user facing benefits, but represent significant
459 improvements to the internals and overall performance of `rustc` and
462 - [All components are now built with `opt-level=3` instead of `2`.][67878]
463 - [Improved how rustc generates drop code.][67332]
464 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
465 - [traits: preallocate 2 Vecs of known initial size][69022]
466 - [Avoid exponential behaviour when relating types][68772]
467 - [Skip `Drop` terminators for enum variants without drop glue][68943]
468 - [Improve performance of coherence checks][68966]
469 - [Deduplicate types in the generator witness][68672]
470 - [Invert control in struct_lint_level.][68725]
472 [67332]: https://github.com/rust-lang/rust/pull/67332/
473 [67429]: https://github.com/rust-lang/rust/pull/67429/
474 [67637]: https://github.com/rust-lang/rust/pull/67637/
475 [67642]: https://github.com/rust-lang/rust/pull/67642/
476 [67878]: https://github.com/rust-lang/rust/pull/67878/
477 [67885]: https://github.com/rust-lang/rust/pull/67885/
478 [68129]: https://github.com/rust-lang/rust/pull/68129/
479 [68672]: https://github.com/rust-lang/rust/pull/68672/
480 [68725]: https://github.com/rust-lang/rust/pull/68725/
481 [68728]: https://github.com/rust-lang/rust/pull/68728/
482 [68738]: https://github.com/rust-lang/rust/pull/68738/
483 [68742]: https://github.com/rust-lang/rust/pull/68742/
484 [68764]: https://github.com/rust-lang/rust/pull/68764/
485 [68772]: https://github.com/rust-lang/rust/pull/68772/
486 [68943]: https://github.com/rust-lang/rust/pull/68943/
487 [68952]: https://github.com/rust-lang/rust/pull/68952/
488 [68966]: https://github.com/rust-lang/rust/pull/68966/
489 [68984]: https://github.com/rust-lang/rust/pull/68984/
490 [69022]: https://github.com/rust-lang/rust/pull/69022/
491 [69185]: https://github.com/rust-lang/rust/pull/69185/
492 [69194]: https://github.com/rust-lang/rust/pull/69194/
493 [69201]: https://github.com/rust-lang/rust/pull/69201/
494 [69227]: https://github.com/rust-lang/rust/pull/69227/
495 [69548]: https://github.com/rust-lang/rust/pull/69548/
496 [69256]: https://github.com/rust-lang/rust/pull/69256/
497 [69361]: https://github.com/rust-lang/rust/pull/69361/
498 [69366]: https://github.com/rust-lang/rust/pull/69366/
499 [69538]: https://github.com/rust-lang/rust/pull/69538/
500 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
501 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
502 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
503 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
504 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
505 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
506 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
507 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
510 Version 1.42.0 (2020-03-12)
511 ==========================
515 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
517 fn foo(words: &[&str]) {
519 ["Hello", "World", "!", ..] => println!("Hello World!"),
520 ["Foo", "Bar", ..] => println!("Baz"),
521 rest => println!("{:?}", rest),
525 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
526 that you can create an enum that has the exact layout and ABI of the type
528 - [There are some *syntax-only* changes:][67131]
529 - `default` is syntactically allowed before items in `trait` definitions.
530 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
531 leave out their bodies in favor of `;`.
532 - Bounds on associated types in `impl`s are now syntactically allowed
533 (e.g. `type Foo: Ord;`).
534 - `...` (the C-variadic type) may occur syntactically directly as the type of
535 any function parameter.
537 These are still rejected *semantically*, so you will likely receive an error
538 but these changes can be seen and parsed by procedural macros and
539 conditional compilation.
543 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
544 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
545 - [`Option::{expect,unwrap}` and
546 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
547 pointing to the location where they were called, rather than
548 `core`'s internals. ][67887]
550 \* Refer to Rust's [platform support page][forge-platform-support] for more
551 information on Rust's tiered platform support.
555 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
556 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
557 to implement `Sized`.][67935]
558 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
559 - [`Layout::new` is now `const`.][66254]
560 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
565 - [`CondVar::wait_while`]
566 - [`CondVar::wait_timeout_while`]
568 - [`DebugMap::value`]
569 - [`ManuallyDrop::take`]
571 - [`ptr::slice_from_raw_parts_mut`]
572 - [`ptr::slice_from_raw_parts`]
576 - [You no longer need to include `extern crate proc_macro;` to be able to
577 `use proc_macro;` in the `2018` edition.][cargo/7700]
581 - [`Error::description` has been deprecated, and its use will now produce a
582 warning.][66919] It's recommended to use `Display`/`to_string` instead.
584 [68253]: https://github.com/rust-lang/rust/pull/68253/
585 [68348]: https://github.com/rust-lang/rust/pull/68348/
586 [67935]: https://github.com/rust-lang/rust/pull/67935/
587 [68339]: https://github.com/rust-lang/rust/pull/68339/
588 [68122]: https://github.com/rust-lang/rust/pull/68122/
589 [67712]: https://github.com/rust-lang/rust/pull/67712/
590 [67887]: https://github.com/rust-lang/rust/pull/67887/
591 [67131]: https://github.com/rust-lang/rust/pull/67131/
592 [67233]: https://github.com/rust-lang/rust/pull/67233/
593 [66899]: https://github.com/rust-lang/rust/pull/66899/
594 [66919]: https://github.com/rust-lang/rust/pull/66919/
595 [66254]: https://github.com/rust-lang/rust/pull/66254/
596 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
597 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
598 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
599 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
600 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
601 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
602 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
603 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
604 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
607 Version 1.41.1 (2020-02-27)
608 ===========================
610 * [Always check types of static items][69145]
611 * [Always check lifetime bounds of `Copy` impls][69145]
612 * [Fix miscompilation in callers of `Layout::repeat`][69225]
614 [69225]: https://github.com/rust-lang/rust/issues/69225
615 [69145]: https://github.com/rust-lang/rust/pull/69145
618 Version 1.41.0 (2020-01-30)
619 ===========================
624 - [You can now pass type parameters to foreign items when implementing
625 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
626 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
627 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
628 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
629 - [You can now use any valid identifier in a `format_args` macro.][66847]
630 Previously identifiers starting with an underscore were not allowed.
631 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
632 enum variants.][66183] These are still rejected semantically, but
633 can be seen and parsed by procedural macros and conditional compilation.
638 - [Rustc will now warn if you have unused loop `'label`s.][66325]
639 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
640 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
641 - [You can now pass an arguments file passing the `@path` syntax
642 to rustc.][66172] Note that the format differs somewhat from what is
643 found in other tooling; please see [the documentation][argfile-docs] for
645 - [You can now provide `--extern` flag without a path, indicating that it is
646 available from the search path or specified with an `-L` flag.][64882]
648 \* Refer to Rust's [platform support page][forge-platform-support] for more
649 information on Rust's tiered platform support.
651 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
656 - [The `core::panic` module is now stable.][66771] It was already stable
658 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
659 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
660 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
666 - [`Result::map_or_else`]
667 - [`std::rc::Weak::weak_count`]
668 - [`std::rc::Weak::strong_count`]
669 - [`std::sync::Weak::weak_count`]
670 - [`std::sync::Weak::strong_count`]
675 - [Cargo will now document all the private items for binary crates
676 by default.][cargo/7593]
677 - [`cargo-install` will now reinstall the package if it detects that it is out
678 of date.][cargo/7560]
679 - [Cargo.lock now uses a more git friendly format that should help to reduce
680 merge conflicts.][cargo/7579]
681 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
682 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
683 optimisation level to `2` for debug builds. You can also use
684 `[profile.<profile>.build-override]` to override build scripts and
690 - [You can now specify `edition` in documentation code blocks to compile the block
691 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
692 should be compiled the 2018 edition of Rust.
693 - [You can now provide custom themes to rustdoc with `--theme`, and check the
694 current theme with `--check-theme`.][54733]
695 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
700 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
701 Apple targets.][apple-32bit-drop] This means that the source code is still
702 available to build, but the targets are no longer being tested and release
703 binaries for those platforms will no longer be distributed by the Rust project.
704 Please refer to the linked blog post for more information.
706 [54733]: https://github.com/rust-lang/rust/pull/54733/
707 [61351]: https://github.com/rust-lang/rust/pull/61351/
708 [67255]: https://github.com/rust-lang/rust/pull/67255/
709 [66661]: https://github.com/rust-lang/rust/pull/66661/
710 [66771]: https://github.com/rust-lang/rust/pull/66771/
711 [66847]: https://github.com/rust-lang/rust/pull/66847/
712 [66238]: https://github.com/rust-lang/rust/pull/66238/
713 [66277]: https://github.com/rust-lang/rust/pull/66277/
714 [66325]: https://github.com/rust-lang/rust/pull/66325/
715 [66172]: https://github.com/rust-lang/rust/pull/66172/
716 [66183]: https://github.com/rust-lang/rust/pull/66183/
717 [65879]: https://github.com/rust-lang/rust/pull/65879/
718 [65013]: https://github.com/rust-lang/rust/pull/65013/
719 [64882]: https://github.com/rust-lang/rust/pull/64882/
720 [64325]: https://github.com/rust-lang/rust/pull/64325/
721 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
722 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
723 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
724 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
725 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
726 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
727 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
728 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
729 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
730 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
731 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
733 Version 1.40.0 (2019-12-19)
734 ===========================
738 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
739 `const` contexts.][65188] e.g.
742 pub struct Point(i32, i32);
744 const ORIGIN: Point = {
745 let constructor = Point;
751 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
752 indicate that there may be variants or fields added in the future.][64639]
753 For example this requires adding a wild-card branch (`_ => {}`) to any match
754 statements on a non-exhaustive `enum`. [(RFC 2008)]
755 - [You can now use function-like procedural macros in `extern` blocks and in
756 type positions.][63931] e.g. `type Generated = macro!();`
757 - [Function-like and attribute procedural macros can now emit
758 `macro_rules!` items, so you can now have your macros generate macros.][64035]
759 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
760 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
761 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
765 - [Added tier 3 support\* for the
766 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
767 - [Added tier 3 support for the
768 `aarch64-unknown-none-softfloat` target.][64589]
769 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
770 `mips64el-unknown-linux-muslabi64` targets.][65843]
772 \* Refer to Rust's [platform support page][forge-platform-support] for more
773 information on Rust's tiered platform support.
777 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
781 - [`BTreeMap::get_key_value`]
782 - [`HashMap::get_key_value`]
783 - [`Option::as_deref_mut`]
784 - [`Option::as_deref`]
785 - [`Option::flatten`]
786 - [`UdpSocket::peer_addr`]
787 - [`f32::to_be_bytes`]
788 - [`f32::to_le_bytes`]
789 - [`f32::to_ne_bytes`]
790 - [`f64::to_be_bytes`]
791 - [`f64::to_le_bytes`]
792 - [`f64::to_ne_bytes`]
793 - [`f32::from_be_bytes`]
794 - [`f32::from_le_bytes`]
795 - [`f32::from_ne_bytes`]
796 - [`f64::from_be_bytes`]
797 - [`f64::from_le_bytes`]
798 - [`f64::from_ne_bytes`]
805 - [Cargo will now always display warnings, rather than only on
806 fresh builds.][cargo/7450]
807 - [Feature flags (except `--all-features`) passed to a virtual workspace will
808 now produce an error.][cargo/7507] Previously these flags were ignored.
809 - [You can now publish `dev-dependencies` without including
810 a `version`.][cargo/7333]
814 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
815 when running documentation tests with `rustdoc`.][63803]
819 - [As previously announced, any previous NLL warnings in the 2015 edition are
820 now hard errors.][64221]
821 - [The `include!` macro will now warn if it failed to include the
822 entire file.][64284] The `include!` macro unintentionally only includes the
823 first _expression_ in a file, and this can be unintuitive. This will become
824 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
825 - [Using `#[inline]` on function prototypes and consts now emits a warning under
826 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
827 or `extern` blocks now correctly emits a hard error.
829 [65294]: https://github.com/rust-lang/rust/pull/65294/
830 [66103]: https://github.com/rust-lang/rust/pull/66103/
831 [65843]: https://github.com/rust-lang/rust/pull/65843/
832 [65188]: https://github.com/rust-lang/rust/pull/65188/
833 [65092]: https://github.com/rust-lang/rust/pull/65092/
834 [64589]: https://github.com/rust-lang/rust/pull/64589/
835 [64639]: https://github.com/rust-lang/rust/pull/64639/
836 [64221]: https://github.com/rust-lang/rust/pull/64221/
837 [64284]: https://github.com/rust-lang/rust/pull/64284/
838 [63931]: https://github.com/rust-lang/rust/pull/63931/
839 [64035]: https://github.com/rust-lang/rust/pull/64035/
840 [63674]: https://github.com/rust-lang/rust/pull/63674/
841 [63803]: https://github.com/rust-lang/rust/pull/63803/
842 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
843 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
844 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
845 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
846 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
847 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
848 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
849 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
850 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
851 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
852 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
853 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
854 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
855 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
856 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
857 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
858 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
859 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
860 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
861 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
862 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
863 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
864 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
865 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
866 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
867 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
870 Version 1.39.0 (2019-11-07)
871 ===========================
875 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
876 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
877 - [You can now use certain attributes on function, closure, and function pointer
878 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
879 `deny`, `forbid` as well as inert helper attributes used by procedural macro
880 attributes applied to items. e.g.
883 #[cfg(windows)] slice: &[u16],
884 #[cfg(not(windows))] slice: &[u8],
889 - [You can now take shared references to bind-by-move patterns in the `if` guards
890 of `match` arms.][63118] e.g.
893 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
897 // ---- `nums` is bound by move.
898 if nums.iter().sum::<u8>() == 10
899 // ^------ `.iter()` implicitly takes a reference to `nums`.
902 // ----------- Legal as `nums` was bound by move and so we have ownership.
913 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
914 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
915 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
916 **Note** Cargo currently doesn't use this feature. Refer to
917 [cargo#7315][cargo/7315] to track this feature's progress.
918 - [You can now pass `--show-output` argument to test binaries to print the
919 output of successful tests.][62600]
922 \* Refer to Rust's [platform support page][forge-platform-support] for more
923 information on Rust's tiered platform support.
927 - [`Vec::new` and `String::new` are now `const` functions.][64028]
928 - [`LinkedList::new` is now a `const` function.][63684]
929 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
930 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
935 - [`Pin::into_inner`]
936 - [`Instant::checked_duration_since`]
937 - [`Instant::saturating_duration_since`]
941 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
942 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
943 `--all` is now deprecated.
947 - [You can now pass `-Clinker` to rustdoc to control the linker used
948 for compiling doctests.][63834]
952 - [Code that was previously accepted by the old borrow checker, but rejected by
953 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
954 previously a warning, and will also become a hard error in the Rust 2015
955 edition in the 1.40.0 release.
956 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
957 run tests.][63827] This should improve performance when running a large
959 - [The `try!` macro will now issue a deprecation warning.][62672] It is
960 recommended to use the `?` operator instead.
961 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
964 [62600]: https://github.com/rust-lang/rust/pull/62600/
965 [62672]: https://github.com/rust-lang/rust/pull/62672/
966 [63118]: https://github.com/rust-lang/rust/pull/63118/
967 [63209]: https://github.com/rust-lang/rust/pull/63209/
968 [63402]: https://github.com/rust-lang/rust/pull/63402/
969 [63565]: https://github.com/rust-lang/rust/pull/63565/
970 [63595]: https://github.com/rust-lang/rust/pull/63595/
971 [63684]: https://github.com/rust-lang/rust/pull/63684/
972 [63698]: https://github.com/rust-lang/rust/pull/63698/
973 [63770]: https://github.com/rust-lang/rust/pull/63770/
974 [63786]: https://github.com/rust-lang/rust/pull/63786/
975 [63827]: https://github.com/rust-lang/rust/pull/63827/
976 [63834]: https://github.com/rust-lang/rust/pull/63834/
977 [63927]: https://github.com/rust-lang/rust/pull/63927/
978 [63933]: https://github.com/rust-lang/rust/pull/63933/
979 [63934]: https://github.com/rust-lang/rust/pull/63934/
980 [63938]: https://github.com/rust-lang/rust/pull/63938/
981 [63940]: https://github.com/rust-lang/rust/pull/63940/
982 [63941]: https://github.com/rust-lang/rust/pull/63941/
983 [63945]: https://github.com/rust-lang/rust/pull/63945/
984 [64010]: https://github.com/rust-lang/rust/pull/64010/
985 [64028]: https://github.com/rust-lang/rust/pull/64028/
986 [64334]: https://github.com/rust-lang/rust/pull/64334/
987 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
988 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
989 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
990 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
991 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
992 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
994 Version 1.38.0 (2019-09-26)
995 ==========================
999 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1000 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1004 - [Added pipelined compilation support to `rustc`.][62766] This will
1005 improve compilation times in some cases. For further information please refer
1006 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1007 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1008 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1009 `x86_64-uwp-windows-msvc` targets.][60260]
1010 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1011 `armv7-unknown-linux-musleabi` targets.][63107]
1012 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1013 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1015 \* Refer to Rust's [platform support page][forge-platform-support] for more
1016 information on Rust's tiered platform support.
1020 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1021 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1022 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1023 is available at `std::clone::Clone`). This also makes all built-in macros
1024 available in `std`/`core` root. e.g. `std::include_bytes!`.
1025 - [`str::Chars` now implements `Debug`.][63000]
1026 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1027 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1028 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1029 - [Added euclidean remainder and division operations (`div_euclid`,
1030 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1031 `overflowing`, and `wrapping` versions are available for all
1033 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1034 `PartialEq`.][61491]
1035 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1039 - [`<*const T>::cast`]
1040 - [`<*mut T>::cast`]
1041 - [`Duration::as_secs_f32`]
1042 - [`Duration::as_secs_f64`]
1043 - [`Duration::div_f32`]
1044 - [`Duration::div_f64`]
1045 - [`Duration::from_secs_f32`]
1046 - [`Duration::from_secs_f64`]
1047 - [`Duration::mul_f32`]
1048 - [`Duration::mul_f64`]
1049 - [`any::type_name`]
1053 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1054 - [You can now pass the `--features` option multiple times to enable
1055 multiple features.][cargo/7084]
1059 - [`rustc` will now warn about some incorrect uses of
1060 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1064 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1066 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1067 issues][62896] with certain crates such as libc.
1069 [60260]: https://github.com/rust-lang/rust/pull/60260/
1070 [61457]: https://github.com/rust-lang/rust/pull/61457/
1071 [61491]: https://github.com/rust-lang/rust/pull/61491/
1072 [61884]: https://github.com/rust-lang/rust/pull/61884/
1073 [61953]: https://github.com/rust-lang/rust/pull/61953/
1074 [62042]: https://github.com/rust-lang/rust/pull/62042/
1075 [62528]: https://github.com/rust-lang/rust/pull/62528/
1076 [62583]: https://github.com/rust-lang/rust/pull/62583/
1077 [62735]: https://github.com/rust-lang/rust/pull/62735/
1078 [62766]: https://github.com/rust-lang/rust/pull/62766/
1079 [62784]: https://github.com/rust-lang/rust/pull/62784/
1080 [62785]: https://github.com/rust-lang/rust/issues/62785/
1081 [62814]: https://github.com/rust-lang/rust/pull/62814/
1082 [62896]: https://github.com/rust-lang/rust/issues/62896/
1083 [63000]: https://github.com/rust-lang/rust/pull/63000/
1084 [63056]: https://github.com/rust-lang/rust/pull/63056/
1085 [63107]: https://github.com/rust-lang/rust/pull/63107/
1086 [63346]: https://github.com/rust-lang/rust/pull/63346/
1087 [63421]: https://github.com/rust-lang/rust/pull/63421/
1088 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1089 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1090 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1091 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1092 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1093 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1094 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1095 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1096 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1097 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1098 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1099 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1100 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1101 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1102 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1104 Version 1.37.0 (2019-08-15)
1105 ==========================
1109 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1110 [`Box`][62228], or an [array][62235] and unused.
1111 - [You can now use the `cfg` and `cfg_attr` attributes on
1112 generic parameters.][61547]
1113 - [You can now use enum variants through type alias.][61682] e.g. You can
1114 write the following:
1116 type MyOption = Option<u8>;
1118 fn increment_or_zero(x: MyOption) -> u8 {
1120 MyOption::Some(y) => y + 1,
1121 MyOption::None => 0,
1125 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1126 `const _: u32 = 5;`.
1127 - [You can now use `#[repr(align(X)]` on enums.][61229]
1128 - [The `?` Kleene macro operator is now available in the
1129 2015 edition.][60932]
1133 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1134 and `-C profile-use` flags.][61268] For more information on how to use profile
1135 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1136 - [The `rust-lldb` wrapper script should now work again.][61827]
1140 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1144 - [`BufReader::buffer`]
1145 - [`BufWriter::buffer`]
1146 - [`Cell::from_mut`]
1147 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1148 - [`DoubleEndedIterator::nth_back`]
1150 - [`Wrapping::reverse_bits`]
1151 - [`i128::reverse_bits`]
1152 - [`i16::reverse_bits`]
1153 - [`i32::reverse_bits`]
1154 - [`i64::reverse_bits`]
1155 - [`i8::reverse_bits`]
1156 - [`isize::reverse_bits`]
1157 - [`slice::copy_within`]
1158 - [`u128::reverse_bits`]
1159 - [`u16::reverse_bits`]
1160 - [`u32::reverse_bits`]
1161 - [`u64::reverse_bits`]
1162 - [`u8::reverse_bits`]
1163 - [`usize::reverse_bits`]
1167 - [`Cargo.lock` files are now included by default when publishing executable crates
1168 with executables.][cargo/7026]
1169 - [You can now specify `default-run="foo"` in `[package]` to specify the
1170 default executable to use for `cargo run`.][cargo/7056]
1177 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1178 Please transition your code to using the `..=` syntax for inclusive
1180 - [Using a trait object without the `dyn` will now warn by default.][61203]
1181 Please transition your code to use `dyn Trait` for trait objects instead.
1183 [62228]: https://github.com/rust-lang/rust/pull/62228/
1184 [62235]: https://github.com/rust-lang/rust/pull/62235/
1185 [61802]: https://github.com/rust-lang/rust/pull/61802/
1186 [61827]: https://github.com/rust-lang/rust/pull/61827/
1187 [61547]: https://github.com/rust-lang/rust/pull/61547/
1188 [61682]: https://github.com/rust-lang/rust/pull/61682/
1189 [61268]: https://github.com/rust-lang/rust/pull/61268/
1190 [61342]: https://github.com/rust-lang/rust/pull/61342/
1191 [61347]: https://github.com/rust-lang/rust/pull/61347/
1192 [61100]: https://github.com/rust-lang/rust/pull/61100/
1193 [61203]: https://github.com/rust-lang/rust/pull/61203/
1194 [61229]: https://github.com/rust-lang/rust/pull/61229/
1195 [60932]: https://github.com/rust-lang/rust/pull/60932/
1196 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1197 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1198 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1199 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1200 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1201 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1202 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1203 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1204 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1205 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1206 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1207 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1208 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1209 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1210 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1211 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1212 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1213 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1214 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1215 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1216 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1217 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1218 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1219 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1222 Version 1.36.0 (2019-07-04)
1223 ==========================
1227 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1228 - [The order of traits in trait objects no longer affects the semantics of that
1229 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1230 `dyn fmt::Debug + Send`, where this was previously not the case.
1234 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1235 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1236 - [`mem::needs_drop` is now available as a const fn.][60364]
1237 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1238 - [`String` now implements `BorrowMut<str>`.][60404]
1239 - [`io::Cursor` now implements `Default`.][60234]
1240 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1241 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1242 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1243 environment has access to heap memory allocation.
1244 - [`String` now implements `From<&String>`.][59825]
1245 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1246 return a tuple of each argument when there is multiple arguments.
1247 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1252 - [`VecDeque::rotate_left`]
1253 - [`VecDeque::rotate_right`]
1254 - [`Iterator::copied`]
1256 - [`io::IoSliceMut`]
1257 - [`Read::read_vectored`]
1258 - [`Write::write_vectored`]
1259 - [`str::as_mut_ptr`]
1260 - [`mem::MaybeUninit`]
1261 - [`pointer::align_offset`]
1262 - [`future::Future`]
1264 - [`task::RawWaker`]
1265 - [`task::RawWakerVTable`]
1271 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1272 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1274 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1278 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1285 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1286 longer recommended, and will be deprecated in 1.39.0.
1288 [60318]: https://github.com/rust-lang/rust/pull/60318/
1289 [60364]: https://github.com/rust-lang/rust/pull/60364/
1290 [60370]: https://github.com/rust-lang/rust/pull/60370/
1291 [60404]: https://github.com/rust-lang/rust/pull/60404/
1292 [60234]: https://github.com/rust-lang/rust/pull/60234/
1293 [60244]: https://github.com/rust-lang/rust/pull/60244/
1294 [58623]: https://github.com/rust-lang/rust/pull/58623/
1295 [59648]: https://github.com/rust-lang/rust/pull/59648/
1296 [59675]: https://github.com/rust-lang/rust/pull/59675/
1297 [59825]: https://github.com/rust-lang/rust/pull/59825/
1298 [59826]: https://github.com/rust-lang/rust/pull/59826/
1299 [59445]: https://github.com/rust-lang/rust/pull/59445/
1300 [59114]: https://github.com/rust-lang/rust/pull/59114/
1301 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1302 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1303 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1304 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1305 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1306 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1307 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1308 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1309 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1310 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1311 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1312 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1313 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1314 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1315 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1316 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1317 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1318 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1319 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1320 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1323 Version 1.35.0 (2019-05-23)
1324 ==========================
1328 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1329 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1330 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1332 unsafe fn call_unsafe(func: unsafe fn()) {
1337 unsafe { call_unsafe(|| {}); }
1344 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1345 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1346 - [Added the `wasm32-unknown-wasi` target.][59464]
1351 - [`Thread` will now show its ID in `Debug` output.][59460]
1352 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1353 - [`alloc::System` now implements `Default`.][59451]
1354 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1356 - [`char::{ToLowercase, ToUppercase}` now
1357 implement `ExactSizeIterator`.][58778]
1358 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1359 - [Removed the `Read` trait bounds
1360 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1361 - [You can now call the `dbg!` macro without any parameters to print the file
1362 and line where it is called.][57847]
1363 - [In place ASCII case conversions are now up to 4× faster.][59283]
1364 e.g. `str::make_ascii_lowercase`
1365 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1372 - [`RefCell::replace_with`]
1373 - [`RefCell::map_split`]
1375 - [`Range::contains`]
1376 - [`RangeFrom::contains`]
1377 - [`RangeTo::contains`]
1378 - [`RangeInclusive::contains`]
1379 - [`RangeToInclusive::contains`]
1380 - [`Option::copied`]
1384 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1385 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1390 - [The Rust toolchain is now available natively for musl based distros.][58575]
1392 [59460]: https://github.com/rust-lang/rust/pull/59460/
1393 [59464]: https://github.com/rust-lang/rust/pull/59464/
1394 [59500]: https://github.com/rust-lang/rust/pull/59500/
1395 [59512]: https://github.com/rust-lang/rust/pull/59512/
1396 [59580]: https://github.com/rust-lang/rust/pull/59580/
1397 [59283]: https://github.com/rust-lang/rust/pull/59283/
1398 [59451]: https://github.com/rust-lang/rust/pull/59451/
1399 [59076]: https://github.com/rust-lang/rust/pull/59076/
1400 [58778]: https://github.com/rust-lang/rust/pull/58778/
1401 [58717]: https://github.com/rust-lang/rust/pull/58717/
1402 [58369]: https://github.com/rust-lang/rust/pull/58369/
1403 [58423]: https://github.com/rust-lang/rust/pull/58423/
1404 [58080]: https://github.com/rust-lang/rust/pull/58080/
1405 [57847]: https://github.com/rust-lang/rust/pull/57847/
1406 [58575]: https://github.com/rust-lang/rust/pull/58575
1407 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1408 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1409 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1410 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1411 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1412 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1413 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1414 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1415 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1416 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1417 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1418 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1420 Version 1.34.2 (2019-05-14)
1421 ===========================
1423 * [Destabilize the `Error::type_id` function due to a security
1424 vulnerability][60785] ([CVE-2019-12083])
1426 [60785]: https://github.com/rust-lang/rust/pull/60785
1427 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1429 Version 1.34.1 (2019-04-25)
1430 ===========================
1432 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1433 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1434 * [Fix Clippy panic when checking some macros][clippy/3805]
1436 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1437 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1438 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1440 Version 1.34.0 (2019-04-11)
1441 ==========================
1445 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1446 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1448 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1449 `#[attr{}]` procedural macros.][57367]
1450 - [You can now write `extern crate self as foo;`][57407] to import your
1451 crate's root into the extern prelude.
1456 - [You can now target `riscv64imac-unknown-none-elf` and
1457 `riscv64gc-unknown-none-elf`.][58406]
1458 - [You can now enable linker plugin LTO optimisations with
1459 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1460 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1462 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1467 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1468 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1469 the `Hash` trait to create an iterator.
1470 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1471 methods.][58421] Most notably you no longer require the `Ord` trait to create
1473 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1474 for all numeric types.][58044]
1475 - [Indexing a `str` is now generic over all types that
1476 implement `SliceIndex<str>`.][57604]
1477 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1478 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1479 produce a warning if their returning type is unused.
1480 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1481 `overflowing_pow` are now available for all numeric types.][57873] These are
1482 equivalent to methods such as `wrapping_add` for the `pow` operation.
1490 * [`Error::type_id`]
1491 * [`atomic::AtomicI16`]
1492 * [`atomic::AtomicI32`]
1493 * [`atomic::AtomicI64`]
1494 * [`atomic::AtomicI8`]
1495 * [`atomic::AtomicU16`]
1496 * [`atomic::AtomicU32`]
1497 * [`atomic::AtomicU64`]
1498 * [`atomic::AtomicU8`]
1499 * [`convert::Infallible`]
1500 * [`convert::TryFrom`]
1501 * [`convert::TryInto`]
1503 * [`iter::successors`]
1504 * [`num::NonZeroI128`]
1505 * [`num::NonZeroI16`]
1506 * [`num::NonZeroI32`]
1507 * [`num::NonZeroI64`]
1508 * [`num::NonZeroI8`]
1509 * [`num::NonZeroIsize`]
1510 * [`slice::sort_by_cached_key`]
1511 * [`str::escape_debug`]
1512 * [`str::escape_default`]
1513 * [`str::escape_unicode`]
1514 * [`str::split_ascii_whitespace`]
1517 * [`Instant::checked_add`]
1518 * [`Instant::checked_sub`]
1519 * [`SystemTime::checked_add`]
1520 * [`SystemTime::checked_sub`]
1524 - [You can now use alternative registries to crates.io.][cargo/6654]
1528 - [You can now use the `?` operator in your documentation tests without manually
1529 adding `fn main() -> Result<(), _> {}`.][56470]
1533 - [`Command::before_exec` is being replaced by the unsafe method
1534 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1535 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1536 can now use `const` functions in `static` variables.
1538 [58370]: https://github.com/rust-lang/rust/pull/58370/
1539 [58406]: https://github.com/rust-lang/rust/pull/58406/
1540 [58421]: https://github.com/rust-lang/rust/pull/58421/
1541 [58166]: https://github.com/rust-lang/rust/pull/58166/
1542 [58044]: https://github.com/rust-lang/rust/pull/58044/
1543 [58057]: https://github.com/rust-lang/rust/pull/58057/
1544 [58059]: https://github.com/rust-lang/rust/pull/58059/
1545 [57809]: https://github.com/rust-lang/rust/pull/57809/
1546 [57873]: https://github.com/rust-lang/rust/pull/57873/
1547 [57604]: https://github.com/rust-lang/rust/pull/57604/
1548 [57367]: https://github.com/rust-lang/rust/pull/57367/
1549 [57407]: https://github.com/rust-lang/rust/pull/57407/
1550 [57425]: https://github.com/rust-lang/rust/pull/57425/
1551 [57106]: https://github.com/rust-lang/rust/pull/57106/
1552 [56470]: https://github.com/rust-lang/rust/pull/56470/
1553 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1554 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1555 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1556 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1557 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1558 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1559 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1560 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1561 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1562 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1563 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1564 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1565 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1566 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1567 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1568 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1569 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1570 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1571 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1572 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1573 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1574 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1575 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1576 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1577 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1578 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1579 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1580 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1581 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1582 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1583 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1586 Version 1.33.0 (2019-02-28)
1587 ==========================
1591 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1592 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1593 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1594 E.g. You can have match statement on a `u8` that covers `0..=255` and
1595 you would no longer be required to have a `_ => unreachable!()` case.
1596 - [You can now have multiple patterns in `if let` and `while let`
1597 expressions.][57532] You can do this with the same syntax as a `match`
1607 let state = Creature::Crab("Ferris");
1609 if let Creature::Crab(name) | Creature::Person(name) = state {
1610 println!("This creature's name is: {}", name);
1614 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1615 this feature will by default produce a warning as this behaviour can be
1616 unintuitive. E.g. `if let _ = 5 {}`
1617 - [You can now use `let` bindings, assignments, expression statements,
1618 and irrefutable pattern destructuring in const functions.][57175]
1619 - [You can now call unsafe const functions.][57067] E.g.
1621 const unsafe fn foo() -> i32 { 5 }
1622 const fn bar() -> i32 {
1626 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1627 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1628 - [You can now specify a specific alignment with the `#[repr(packed)]`
1629 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1630 with an alignment of 2 bytes and a size of 6 bytes.
1631 - [You can now import an item from a module as an `_`.][56303] This allows you to
1632 import a trait's impls, and not have the name in the namespace. E.g.
1634 use std::io::Read as _;
1636 // Allowed as there is only one `Read` in the module.
1639 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1643 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1644 command line argument.][56351]
1645 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1646 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1647 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1648 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1649 information on Rust's platform support.
1650 - [Added support for the `thumbv7neon-linux-androideabi` and
1651 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1652 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1656 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1657 functions for all numeric types.][57566]
1658 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1659 are now `const` functions for all numeric types.][57105]
1660 - [The methods `is_positive` and `is_negative` are now `const` functions for
1661 all signed numeric types.][57105]
1662 - [The `get` method for all `NonZero` types is now `const`.][57167]
1663 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1664 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1665 numeric types.][57234]
1666 - [`Ipv4Addr::new` is now a `const` function][57234]
1670 - [`unix::FileExt::read_exact_at`]
1671 - [`unix::FileExt::write_all_at`]
1672 - [`Option::transpose`]
1673 - [`Result::transpose`]
1674 - [`convert::identity`]
1677 - [`marker::PhantomPinned`]
1678 - [`Vec::resize_with`]
1679 - [`VecDeque::resize_with`]
1680 - [`Duration::as_millis`]
1681 - [`Duration::as_micros`]
1682 - [`Duration::as_nanos`]
1687 - [You can now publish crates that require a feature flag to compile with
1688 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1689 - [Cargo should now rebuild a crate if a file was modified during the initial
1694 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1695 are now deprecated in the standard library, and their usage will now produce a warning.
1696 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1698 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1700 - [Libtest no longer creates a new thread for each test when
1701 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1703 [55982]: https://github.com/rust-lang/rust/pull/55982/
1704 [56243]: https://github.com/rust-lang/rust/pull/56243
1705 [56303]: https://github.com/rust-lang/rust/pull/56303/
1706 [56351]: https://github.com/rust-lang/rust/pull/56351/
1707 [56362]: https://github.com/rust-lang/rust/pull/56362
1708 [56642]: https://github.com/rust-lang/rust/pull/56642/
1709 [56769]: https://github.com/rust-lang/rust/pull/56769/
1710 [56805]: https://github.com/rust-lang/rust/pull/56805
1711 [56947]: https://github.com/rust-lang/rust/pull/56947/
1712 [57049]: https://github.com/rust-lang/rust/pull/57049/
1713 [57067]: https://github.com/rust-lang/rust/pull/57067/
1714 [57105]: https://github.com/rust-lang/rust/pull/57105
1715 [57130]: https://github.com/rust-lang/rust/pull/57130/
1716 [57167]: https://github.com/rust-lang/rust/pull/57167/
1717 [57175]: https://github.com/rust-lang/rust/pull/57175/
1718 [57234]: https://github.com/rust-lang/rust/pull/57234/
1719 [57332]: https://github.com/rust-lang/rust/pull/57332/
1720 [57465]: https://github.com/rust-lang/rust/pull/57465/
1721 [57532]: https://github.com/rust-lang/rust/pull/57532/
1722 [57535]: https://github.com/rust-lang/rust/pull/57535/
1723 [57566]: https://github.com/rust-lang/rust/pull/57566/
1724 [57615]: https://github.com/rust-lang/rust/pull/57615/
1725 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1726 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1727 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1728 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1729 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1730 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1731 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1732 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1733 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1734 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1735 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1736 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1737 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1738 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1739 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1740 [platform-support]: https://forge.rust-lang.org/platform-support.html
1742 Version 1.32.0 (2019-01-17)
1743 ==========================
1748 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1749 operator allows you to specify zero or one repetitions similar to the `*` and
1751 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1752 now always resolve to the item (`enum`, `struct`, etc.) available in the
1753 module if present, before resolving to a external crate or an item the prelude.][56759]
1756 enum Color { Red, Green, Blue }
1762 - [You can now match against `PhantomData<T>` types.][55837]
1763 - [You can now match against literals in macros with the `literal`
1764 specifier.][56072] This will match against a literal of any type.
1765 E.g. `1`, `'A'`, `"Hello World"`
1766 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1768 struct Point(i32, i32);
1771 pub fn new(x: i32, y: i32) -> Self {
1775 pub fn is_origin(&self) -> bool {
1783 - [Self can also now be used in type definitions.][56366] E.g.
1787 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1790 Cons(T, Box<Self>) // likewise here
1793 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1794 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1798 - [The default allocator has changed from jemalloc to the default allocator on
1799 your system.][55238] The compiler itself on Linux & macOS will still use
1800 jemalloc, but programs compiled with it will use the system allocator.
1801 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1805 - [`PathBuf` now implements `FromStr`.][55148]
1806 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1807 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1808 easily debug expressions in your rust program. E.g.
1811 let b = dbg!(a * 2) + 1;
1812 // ^-- prints: [src/main.rs:4] a * 2 = 4
1816 The following APIs are now `const` functions and can be used in a
1820 - [`UnsafeCell::get`]
1821 - [`char::is_ascii`]
1823 - [`ManuallyDrop::new`]
1824 - [`ManuallyDrop::into_inner`]
1825 - [`RangeInclusive::start`]
1826 - [`RangeInclusive::end`]
1827 - [`NonNull::as_ptr`]
1830 - [`Duration::as_secs`]
1831 - [`Duration::subsec_millis`]
1832 - [`Duration::subsec_micros`]
1833 - [`Duration::subsec_nanos`]
1835 - [`Ipv4Addr::is_unspecified`]
1837 - [`Ipv6Addr::octets`]
1841 - [`i8::to_be_bytes`]
1842 - [`i8::to_le_bytes`]
1843 - [`i8::to_ne_bytes`]
1844 - [`i8::from_be_bytes`]
1845 - [`i8::from_le_bytes`]
1846 - [`i8::from_ne_bytes`]
1847 - [`i16::to_be_bytes`]
1848 - [`i16::to_le_bytes`]
1849 - [`i16::to_ne_bytes`]
1850 - [`i16::from_be_bytes`]
1851 - [`i16::from_le_bytes`]
1852 - [`i16::from_ne_bytes`]
1853 - [`i32::to_be_bytes`]
1854 - [`i32::to_le_bytes`]
1855 - [`i32::to_ne_bytes`]
1856 - [`i32::from_be_bytes`]
1857 - [`i32::from_le_bytes`]
1858 - [`i32::from_ne_bytes`]
1859 - [`i64::to_be_bytes`]
1860 - [`i64::to_le_bytes`]
1861 - [`i64::to_ne_bytes`]
1862 - [`i64::from_be_bytes`]
1863 - [`i64::from_le_bytes`]
1864 - [`i64::from_ne_bytes`]
1865 - [`i128::to_be_bytes`]
1866 - [`i128::to_le_bytes`]
1867 - [`i128::to_ne_bytes`]
1868 - [`i128::from_be_bytes`]
1869 - [`i128::from_le_bytes`]
1870 - [`i128::from_ne_bytes`]
1871 - [`isize::to_be_bytes`]
1872 - [`isize::to_le_bytes`]
1873 - [`isize::to_ne_bytes`]
1874 - [`isize::from_be_bytes`]
1875 - [`isize::from_le_bytes`]
1876 - [`isize::from_ne_bytes`]
1877 - [`u8::to_be_bytes`]
1878 - [`u8::to_le_bytes`]
1879 - [`u8::to_ne_bytes`]
1880 - [`u8::from_be_bytes`]
1881 - [`u8::from_le_bytes`]
1882 - [`u8::from_ne_bytes`]
1883 - [`u16::to_be_bytes`]
1884 - [`u16::to_le_bytes`]
1885 - [`u16::to_ne_bytes`]
1886 - [`u16::from_be_bytes`]
1887 - [`u16::from_le_bytes`]
1888 - [`u16::from_ne_bytes`]
1889 - [`u32::to_be_bytes`]
1890 - [`u32::to_le_bytes`]
1891 - [`u32::to_ne_bytes`]
1892 - [`u32::from_be_bytes`]
1893 - [`u32::from_le_bytes`]
1894 - [`u32::from_ne_bytes`]
1895 - [`u64::to_be_bytes`]
1896 - [`u64::to_le_bytes`]
1897 - [`u64::to_ne_bytes`]
1898 - [`u64::from_be_bytes`]
1899 - [`u64::from_le_bytes`]
1900 - [`u64::from_ne_bytes`]
1901 - [`u128::to_be_bytes`]
1902 - [`u128::to_le_bytes`]
1903 - [`u128::to_ne_bytes`]
1904 - [`u128::from_be_bytes`]
1905 - [`u128::from_le_bytes`]
1906 - [`u128::from_ne_bytes`]
1907 - [`usize::to_be_bytes`]
1908 - [`usize::to_le_bytes`]
1909 - [`usize::to_ne_bytes`]
1910 - [`usize::from_be_bytes`]
1911 - [`usize::from_le_bytes`]
1912 - [`usize::from_ne_bytes`]
1916 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1917 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1921 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1925 - [The argument types for AVX's
1926 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1927 been changed from `*const` to `*mut` as the previous implementation
1931 [55148]: https://github.com/rust-lang/rust/pull/55148/
1932 [55238]: https://github.com/rust-lang/rust/pull/55238/
1933 [55280]: https://github.com/rust-lang/rust/pull/55280/
1934 [55610]: https://github.com/rust-lang/rust/pull/55610/
1935 [55663]: https://github.com/rust-lang/rust/pull/55663/
1936 [55702]: https://github.com/rust-lang/rust/pull/55702/
1937 [55837]: https://github.com/rust-lang/rust/pull/55837/
1938 [55843]: https://github.com/rust-lang/rust/pull/55843/
1939 [56072]: https://github.com/rust-lang/rust/pull/56072/
1940 [56245]: https://github.com/rust-lang/rust/pull/56245/
1941 [56365]: https://github.com/rust-lang/rust/pull/56365/
1942 [56366]: https://github.com/rust-lang/rust/pull/56366/
1943 [56395]: https://github.com/rust-lang/rust/pull/56395/
1944 [56759]: https://github.com/rust-lang/rust/pull/56759/
1945 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1946 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1947 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1948 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1949 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1950 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1951 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1952 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1953 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1954 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1955 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1956 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1957 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1958 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1959 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1960 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1961 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1962 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1963 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1964 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1965 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1966 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1967 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1968 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1969 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1970 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1971 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1972 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1973 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1974 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1975 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1976 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1977 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1978 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1979 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1980 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1981 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1982 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1983 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1984 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1985 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1986 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1987 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1988 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1989 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1990 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1991 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1992 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1993 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1994 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1995 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1996 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1997 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1998 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1999 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2000 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2001 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2002 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2003 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2004 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2005 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2006 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2007 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2008 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2009 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2010 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2011 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2012 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2013 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2014 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2015 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2016 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2017 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2018 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2019 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2020 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2021 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2022 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2023 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2024 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2025 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2026 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2027 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2028 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2029 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2030 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2031 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2032 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2033 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2034 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2035 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2036 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2037 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2040 Version 1.31.1 (2018-12-20)
2041 ===========================
2043 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2044 - [Fix broken go-to-definition in RLS][rls/1171]
2045 - [Fix infinite loop on hover in RLS][rls/1170]
2047 [56562]: https://github.com/rust-lang/rust/pull/56562
2048 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2049 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2051 Version 1.31.0 (2018-12-06)
2052 ==========================
2056 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2057 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2058 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2059 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2061 - [You can now define and use `const` functions.][54835] These are currently
2062 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2063 [language reference][const-reference] for what exactly is available.
2064 - [You can now use tool lints, which allow you to scope lints from external
2065 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2066 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2067 a crate, not just in exported functions.][54451]
2068 - [You can now use parentheses in pattern matches.][54497]
2072 - [Updated musl to 1.1.20][54430]
2076 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2077 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2078 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2079 into `Option<&mut T>` using the `From` trait.][53218]
2080 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2085 - [`slice::align_to`]
2086 - [`slice::align_to_mut`]
2087 - [`slice::chunks_exact`]
2088 - [`slice::chunks_exact_mut`]
2089 - [`slice::rchunks`]
2090 - [`slice::rchunks_mut`]
2091 - [`slice::rchunks_exact`]
2092 - [`slice::rchunks_exact_mut`]
2093 - [`Option::replace`]
2097 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2098 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2099 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2101 [52813]: https://github.com/rust-lang/rust/pull/52813/
2102 [53218]: https://github.com/rust-lang/rust/pull/53218/
2103 [53555]: https://github.com/rust-lang/rust/issues/53555/
2104 [54057]: https://github.com/rust-lang/rust/pull/54057/
2105 [54240]: https://github.com/rust-lang/rust/pull/54240/
2106 [54430]: https://github.com/rust-lang/rust/pull/54430/
2107 [54451]: https://github.com/rust-lang/rust/pull/54451/
2108 [54497]: https://github.com/rust-lang/rust/pull/54497/
2109 [54778]: https://github.com/rust-lang/rust/pull/54778/
2110 [54835]: https://github.com/rust-lang/rust/pull/54835/
2111 [54870]: https://github.com/rust-lang/rust/pull/54870/
2112 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2113 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2114 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2115 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2116 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2117 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2118 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2119 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2120 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2121 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2122 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2123 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2124 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2125 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2127 Version 1.30.1 (2018-11-08)
2128 ===========================
2130 - [Fixed overflow ICE in rustdoc][54199]
2131 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2133 [54199]: https://github.com/rust-lang/rust/pull/54199
2134 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2136 Version 1.30.0 (2018-10-25)
2137 ==========================
2141 - [Procedural macros are now available.][52081] These kinds of macros allow for
2142 more powerful code generation. There is a [new chapter available][proc-macros]
2143 in the Rust Programming Language book that goes further in depth.
2144 - [You can now use keywords as identifiers using the raw identifiers
2145 syntax (`r#`),][53236] e.g. `let r#for = true;`
2146 - [Using anonymous parameters in traits is now deprecated with a warning and
2147 will be a hard error in the 2018 edition.][53272]
2148 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2149 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2150 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2151 Previously, using a external crate in a module without a use statement
2152 required `let json = ::serde_json::from_str(foo);` but can now be written
2153 as `let json = serde_json::from_str(foo);`.
2154 - [You can now apply the `#[used]` attribute to static items to prevent the
2155 compiler from optimising them away, even if they appear to be unused,][51363]
2156 e.g. `#[used] static FOO: u32 = 1;`
2157 - [You can now import and reexport macros from other crates with the `use`
2158 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2159 the root module of the crate. If your macro relies on calling other local
2160 macros, it is recommended to export with the
2161 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2163 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2164 using the `vis` specifier.][53370]
2165 - [Non-macro attributes now allow all forms of literals, not just
2166 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2167 write `#[attr(true)]`.
2168 - [You can now specify a function to handle a panic in the Rust runtime with the
2169 `#[panic_handler]` attribute.][51366]
2173 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2174 - [Added the `aarch64-unknown-netbsd` target][53165]
2178 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2182 - [`Ipv4Addr::BROADCAST`]
2183 - [`Ipv4Addr::LOCALHOST`]
2184 - [`Ipv4Addr::UNSPECIFIED`]
2185 - [`Ipv6Addr::LOCALHOST`]
2186 - [`Ipv6Addr::UNSPECIFIED`]
2187 - [`Iterator::find_map`]
2189 The following methods are replacement methods for `trim_left`, `trim_right`,
2190 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2192 - [`str::trim_end_matches`]
2194 - [`str::trim_start_matches`]
2195 - [`str::trim_start`]
2199 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2200 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2201 equivalent to calling `rustdoc --error-format=json`.
2202 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2206 - [`rustdoc` allows you to specify what edition to treat your code as with the
2207 `--edition` option.][54057]
2208 - [`rustdoc` now has the `--color` (specify whether to output color) and
2209 `--error-format` (specify error format, e.g. `json`) options.][53003]
2210 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2211 debug symbols.][53774]
2212 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2213 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2215 [50911]: https://github.com/rust-lang/rust/pull/50911/
2216 [51363]: https://github.com/rust-lang/rust/pull/51363/
2217 [51366]: https://github.com/rust-lang/rust/pull/51366/
2218 [52081]: https://github.com/rust-lang/rust/pull/52081/
2219 [53003]: https://github.com/rust-lang/rust/pull/53003/
2220 [53033]: https://github.com/rust-lang/rust/pull/53033/
2221 [53044]: https://github.com/rust-lang/rust/pull/53044/
2222 [53165]: https://github.com/rust-lang/rust/pull/53165/
2223 [53213]: https://github.com/rust-lang/rust/pull/53213/
2224 [53236]: https://github.com/rust-lang/rust/pull/53236/
2225 [53272]: https://github.com/rust-lang/rust/pull/53272/
2226 [53370]: https://github.com/rust-lang/rust/pull/53370/
2227 [53459]: https://github.com/rust-lang/rust/pull/53459/
2228 [53774]: https://github.com/rust-lang/rust/pull/53774/
2229 [53822]: https://github.com/rust-lang/rust/pull/53822/
2230 [54057]: https://github.com/rust-lang/rust/pull/54057/
2231 [54146]: https://github.com/rust-lang/rust/pull/54146/
2232 [54404]: https://github.com/rust-lang/rust/pull/54404/
2233 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2234 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2235 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2236 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2238 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2239 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2240 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2241 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2242 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2243 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2244 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2245 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2246 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2247 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2250 Version 1.29.2 (2018-10-11)
2251 ===========================
2253 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2254 - The `rls-preview` component on the windows-gnu targets has been restored.
2256 [54639]: https://github.com/rust-lang/rust/pull/54639
2259 Version 1.29.1 (2018-09-25)
2260 ===========================
2265 - The standard library's `str::repeat` function contained an out of bounds write
2266 caused by an integer overflow. This has been fixed by deterministically
2267 panicking when an overflow happens.
2269 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2273 Version 1.29.0 (2018-09-13)
2274 ==========================
2278 - [Bumped minimum LLVM version to 5.0.][51899]
2279 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2280 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2284 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2285 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2286 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2287 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2289 - [`Cell<T>` now allows `T` to be unsized.][50494]
2290 - [`SocketAddr` is now stable on Redox.][52656]
2295 - [`Iterator::flatten`]
2300 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2301 `--locked` to disable this behavior.
2302 - [`cargo-install` will now allow you to cross compile an install
2303 using `--target`.][cargo/5614]
2304 - [Added the `cargo-fix` subcommand to automatically move project code from
2305 2015 edition to 2018.][cargo/5723]
2306 - [`cargo doc` can now optionally document private types using the
2307 `--document-private-items` flag.][cargo/5543]
2311 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2312 the specified level to that level.][52354] For example `--cap-lints warn`
2313 will demote `deny` and `forbid` lints to `warn`.
2314 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2315 fails and `101` if there is a panic.][52197]
2316 - [A preview of clippy has been made available through rustup.][51122]
2317 You can install the preview with `rustup component add clippy-preview`.
2321 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2322 Use `str::get_unchecked(begin..end)` instead.
2323 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2324 Consider using the `home_dir` function from
2325 https://crates.io/crates/dirs instead.
2326 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2327 - [`cfg` attributes and `--cfg` command line flags are now more
2328 strictly validated.][53893]
2330 [53893]: https://github.com/rust-lang/rust/pull/53893/
2331 [52861]: https://github.com/rust-lang/rust/pull/52861/
2332 [52656]: https://github.com/rust-lang/rust/pull/52656/
2333 [52239]: https://github.com/rust-lang/rust/pull/52239/
2334 [52330]: https://github.com/rust-lang/rust/pull/52330/
2335 [52354]: https://github.com/rust-lang/rust/pull/52354/
2336 [52402]: https://github.com/rust-lang/rust/pull/52402/
2337 [52103]: https://github.com/rust-lang/rust/pull/52103/
2338 [52197]: https://github.com/rust-lang/rust/pull/52197/
2339 [51807]: https://github.com/rust-lang/rust/pull/51807/
2340 [51899]: https://github.com/rust-lang/rust/pull/51899/
2341 [51912]: https://github.com/rust-lang/rust/pull/51912/
2342 [51511]: https://github.com/rust-lang/rust/pull/51511/
2343 [51619]: https://github.com/rust-lang/rust/pull/51619/
2344 [51656]: https://github.com/rust-lang/rust/pull/51656/
2345 [51178]: https://github.com/rust-lang/rust/pull/51178/
2346 [51122]: https://github.com/rust-lang/rust/pull/51122
2347 [50494]: https://github.com/rust-lang/rust/pull/50494/
2348 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2349 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2350 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2351 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2352 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2353 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2354 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2357 Version 1.28.0 (2018-08-02)
2358 ===========================
2362 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2363 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2364 the inner type across Foreign Function Interface (FFI) boundaries.
2365 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2366 and can now be used as identifiers.][51196]
2367 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2368 stable.][51241] This will allow users to specify a global allocator for
2370 - [Unit test functions marked with the `#[test]` attribute can now return
2371 `Result<(), E: Debug>` in addition to `()`.][51298]
2372 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2373 allows macros to easily target lifetimes.
2377 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2378 prioritise making smaller binary sizes. `z` is the same as `s` with the
2379 exception that it does not vectorise loops, which typically results in an even
2381 - [The short error format is now stable.][49546] Specified with
2382 `--error-format=short` this option will provide a more compressed output of
2383 rust error messages.
2384 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2385 - [Reduced the number of allocations in the macro parser.][50855] This can
2386 improve compile times of macro heavy crates on average by 5%.
2390 - [Implemented `Default` for `&mut str`.][51306]
2391 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2392 - [Implemented `Extend` for `()`.][50234]
2393 - [The `Debug` implementation of `time::Duration` should now be more easily
2394 human readable.][50364] Previously a `Duration` of one second would printed as
2395 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2396 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2397 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2398 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2399 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2400 for `PathBuf`.][50170]
2401 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2402 and `Wrapping<i128>`.][50465]
2403 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2404 possible.][51050] This can provide up to a 40% speed increase.
2405 - [Improved error messages when using `format!`.][50610]
2409 - [`Iterator::step_by`]
2410 - [`Path::ancestors`]
2411 - [`SystemTime::UNIX_EPOCH`]
2412 - [`alloc::GlobalAlloc`]
2414 - [`alloc::LayoutErr`]
2417 - [`alloc::alloc_zeroed`]
2418 - [`alloc::dealloc`]
2419 - [`alloc::realloc`]
2420 - [`alloc::handle_alloc_error`]
2421 - [`btree_map::Entry::or_default`]
2422 - [`fmt::Alignment`]
2423 - [`hash_map::Entry::or_default`]
2424 - [`iter::repeat_with`]
2425 - [`num::NonZeroUsize`]
2426 - [`num::NonZeroU128`]
2427 - [`num::NonZeroU16`]
2428 - [`num::NonZeroU32`]
2429 - [`num::NonZeroU64`]
2430 - [`num::NonZeroU8`]
2431 - [`ops::RangeBounds`]
2432 - [`slice::SliceIndex`]
2433 - [`slice::from_mut`]
2434 - [`slice::from_ref`]
2435 - [`{Any + Send + Sync}::downcast_mut`]
2436 - [`{Any + Send + Sync}::downcast_ref`]
2437 - [`{Any + Send + Sync}::is`]
2441 - [Cargo will now no longer allow you to publish crates with build scripts that
2442 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2443 considered to be immutable.
2447 - [The `suggestion_applicability` field in `rustc`'s json output is now
2448 stable.][50486] This will allow dev tools to check whether a code suggestion
2449 would apply to them.
2453 - [Rust will consider trait objects with duplicated constraints to be the same
2454 type as without the duplicated constraint.][51276] For example the below code will
2455 now fail to compile.
2460 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2463 impl Trait + Send + Send {
2464 fn test(&self) { println!("two"); }
2468 [49546]: https://github.com/rust-lang/rust/pull/49546/
2469 [50143]: https://github.com/rust-lang/rust/pull/50143/
2470 [50170]: https://github.com/rust-lang/rust/pull/50170/
2471 [50234]: https://github.com/rust-lang/rust/pull/50234/
2472 [50265]: https://github.com/rust-lang/rust/pull/50265/
2473 [50364]: https://github.com/rust-lang/rust/pull/50364/
2474 [50385]: https://github.com/rust-lang/rust/pull/50385/
2475 [50465]: https://github.com/rust-lang/rust/pull/50465/
2476 [50486]: https://github.com/rust-lang/rust/pull/50486/
2477 [50554]: https://github.com/rust-lang/rust/pull/50554/
2478 [50610]: https://github.com/rust-lang/rust/pull/50610/
2479 [50855]: https://github.com/rust-lang/rust/pull/50855/
2480 [51050]: https://github.com/rust-lang/rust/pull/51050/
2481 [51196]: https://github.com/rust-lang/rust/pull/51196/
2482 [51200]: https://github.com/rust-lang/rust/pull/51200/
2483 [51241]: https://github.com/rust-lang/rust/pull/51241/
2484 [51276]: https://github.com/rust-lang/rust/pull/51276/
2485 [51298]: https://github.com/rust-lang/rust/pull/51298/
2486 [51306]: https://github.com/rust-lang/rust/pull/51306/
2487 [51562]: https://github.com/rust-lang/rust/pull/51562/
2488 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2489 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2490 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2491 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2492 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2493 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2494 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2495 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2496 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2497 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2498 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2499 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2500 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2501 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2502 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2503 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2504 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2505 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2506 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2507 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2508 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2509 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2510 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2511 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2512 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2513 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2514 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2515 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2516 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2517 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2519 Version 1.27.2 (2018-07-20)
2520 ===========================
2525 - The borrow checker was fixed to avoid potential unsoundness when using
2526 match ergonomics: [#52213][52213].
2528 [52213]: https://github.com/rust-lang/rust/issues/52213
2530 Version 1.27.1 (2018-07-10)
2531 ===========================
2536 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2537 when running, which enabled executing code as some other user on a
2538 given machine. This release fixes that vulnerability; you can read
2539 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2541 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2546 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2547 match ergonomics: [#51415][51415], [#49534][49534].
2549 [51415]: https://github.com/rust-lang/rust/issues/51415
2550 [49534]: https://github.com/rust-lang/rust/issues/49534
2551 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2552 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2554 Version 1.27.0 (2018-06-21)
2555 ==========================
2559 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2560 be used as an identifier.
2561 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2562 bare `Trait` syntax, and should make it clearer when being used in tandem with
2563 `impl Trait` because it is equivalent to the following syntax:
2564 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2565 `Box<Trait> == Box<dyn Trait>`.
2566 - [Attributes on generic parameters such as types and lifetimes are
2567 now stable.][48851] e.g.
2568 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2569 - [The `#[must_use]` attribute can now also be used on functions as well as
2570 types.][48925] It provides a lint that by default warns users when the
2571 value returned by a function has not been used.
2575 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2579 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2580 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2581 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2582 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2583 the `cfg` attribute.
2584 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2585 std are now available in core.][49896]
2586 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2588 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2589 that the operation isn't done in place.
2590 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2591 the `#[must_use]` attribute][49533] to warn about unused potentially
2592 expensive allocations.
2596 - [`DoubleEndedIterator::rfind`]
2597 - [`DoubleEndedIterator::rfold`]
2598 - [`DoubleEndedIterator::try_rfold`]
2599 - [`Duration::from_micros`]
2600 - [`Duration::from_nanos`]
2601 - [`Duration::subsec_micros`]
2602 - [`Duration::subsec_millis`]
2603 - [`HashMap::remove_entry`]
2604 - [`Iterator::try_fold`]
2605 - [`Iterator::try_for_each`]
2607 - [`Option::filter`]
2608 - [`String::replace_range`]
2609 - [`Take::set_limit`]
2610 - [`hint::unreachable_unchecked`]
2611 - [`os::unix::process::parent_id`]
2612 - [`ptr::swap_nonoverlapping`]
2613 - [`slice::rsplit_mut`]
2615 - [`slice::swap_with_slice`]
2619 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2620 `readme`, and `repository` fields.][cargo/5386]
2621 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2622 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2623 a different directory than `target` for placing compilation artifacts.
2624 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2625 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2626 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2627 where cargo would infer a binary, Cargo will produce a warning. You can
2628 disable this feature ahead of time by setting any of the following to false:
2629 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2630 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2631 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2635 - [Added “The Rustc book” into the official documentation.][49707]
2636 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2637 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2641 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2642 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2643 compile, `"".is_empty()` will still compile.
2644 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2645 will only print the inner type.][48553] E.g.
2646 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2647 not `AtomicBool(true)`.
2648 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2649 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2650 alignment should cover all use cases.
2651 - The `.description()` method on the `std::error::Error` trait
2652 [has been soft-deprecated][50163]. It is no longer required to implement it.
2654 [48553]: https://github.com/rust-lang/rust/pull/48553/
2655 [48851]: https://github.com/rust-lang/rust/pull/48851/
2656 [48925]: https://github.com/rust-lang/rust/pull/48925/
2657 [49533]: https://github.com/rust-lang/rust/pull/49533/
2658 [49623]: https://github.com/rust-lang/rust/pull/49623/
2659 [49630]: https://github.com/rust-lang/rust/pull/49630/
2660 [49664]: https://github.com/rust-lang/rust/pull/49664/
2661 [49699]: https://github.com/rust-lang/rust/pull/49699/
2662 [49707]: https://github.com/rust-lang/rust/pull/49707/
2663 [49719]: https://github.com/rust-lang/rust/pull/49719/
2664 [49896]: https://github.com/rust-lang/rust/pull/49896/
2665 [49968]: https://github.com/rust-lang/rust/pull/49968/
2666 [50163]: https://github.com/rust-lang/rust/pull/50163
2667 [50177]: https://github.com/rust-lang/rust/pull/50177/
2668 [50378]: https://github.com/rust-lang/rust/pull/50378/
2669 [50398]: https://github.com/rust-lang/rust/pull/50398/
2670 [50423]: https://github.com/rust-lang/rust/pull/50423/
2671 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2672 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2673 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2674 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2675 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2676 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2677 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2678 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2679 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2680 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2681 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2682 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2683 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2684 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2685 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2686 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2687 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2688 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2689 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2690 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2691 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2692 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2693 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2694 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2695 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2696 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2697 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2698 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2699 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2700 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2703 Version 1.26.2 (2018-06-05)
2704 ==========================
2709 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2711 [51117]: https://github.com/rust-lang/rust/issues/51117
2714 Version 1.26.1 (2018-05-29)
2715 ==========================
2720 - [RLS now works on Windows.][50646]
2721 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2727 - [`fn main() -> impl Trait` no longer works for non-Termination
2729 This reverts an accidental stabilization.
2730 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2731 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2733 [50646]: https://github.com/rust-lang/rust/issues/50646
2734 [50656]: https://github.com/rust-lang/rust/pull/50656
2735 [50812]: https://github.com/rust-lang/rust/pull/50812
2736 [50950]: https://github.com/rust-lang/rust/issues/50950
2737 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2739 Version 1.26.0 (2018-05-10)
2740 ==========================
2744 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2745 implement either or both traits.][49299]
2746 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2747 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2748 lifetime can be elided.][49458]
2749 - [`impl Trait` is now stable allowing you to have abstract types in returns
2750 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2751 `fn open(path: impl AsRef<Path>)`.
2752 - [Pattern matching will now automatically apply dereferences.][49394]
2753 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2754 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2755 - [A lot of operations are now available in a const context.][46882] E.g. You
2756 can now index into constant arrays, reference and dereference into constants,
2757 and use tuple struct constructors.
2758 - [Fixed entry slice patterns are now stable.][48516] E.g.
2760 let points = [1, 2, 3, 4];
2762 [1, 2, 3, 4] => println!("All points were sequential."),
2763 _ => println!("Not all points were sequential."),
2770 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2771 - [Fixed exponential projection complexity on nested types.][48296]
2772 This can provide up to a ~12% reduction in compile times for certain crates.
2773 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2774 to remap path prefixes outputted by the compiler.
2775 - [Added `powerpc-unknown-netbsd` target.][48281]
2779 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2780 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2781 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2782 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2783 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2784 - [`ascii::escape_default` is now available in libcore.][48735]
2785 - [Trailing commas are now supported in std and core macros.][48056]
2786 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2787 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2792 - [`*const T::copy_to_nonoverlapping`]
2793 - [`*const T::copy_to`]
2794 - [`*const T::read_unaligned`]
2795 - [`*const T::read_volatile`]
2796 - [`*const T::read`]
2798 - [`*const T::wrapping_add`]
2799 - [`*const T::wrapping_sub`]
2801 - [`*mut T::copy_to_nonoverlapping`]
2802 - [`*mut T::copy_to`]
2803 - [`*mut T::read_unaligned`]
2804 - [`*mut T::read_volatile`]
2806 - [`*mut T::replace`]
2809 - [`*mut T::wrapping_add`]
2810 - [`*mut T::wrapping_sub`]
2811 - [`*mut T::write_bytes`]
2812 - [`*mut T::write_unaligned`]
2813 - [`*mut T::write_volatile`]
2816 - [`FromUtf8Error::as_bytes`]
2817 - [`LocalKey::try_with`]
2818 - [`Option::cloned`]
2819 - [`btree_map::Entry::and_modify`]
2820 - [`fs::read_to_string`]
2823 - [`hash_map::Entry::and_modify`]
2824 - [`iter::FusedIterator`]
2825 - [`ops::RangeInclusive`]
2826 - [`ops::RangeToInclusive`]
2828 - [`slice::rotate_left`]
2829 - [`slice::rotate_right`]
2830 - [`String::retain`]
2835 - [Cargo will now output path to custom commands when `-v` is
2836 passed with `--list`][cargo/5041]
2837 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2841 - [The second edition of "The Rust Programming Language" book is now recommended
2842 over the first.][48404]
2847 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2848 syntax is now invalid.
2850 use std::ops::Fn as dyn;
2851 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2853 - [The result of dereferences are no longer promoted to `'static`.][47408]
2857 const PAIR: &(i32, i32) = &(0, 1);
2858 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2861 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2862 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2864 - [Removed hoedown from rustdoc.][48274]
2865 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2867 [46882]: https://github.com/rust-lang/rust/pull/46882
2868 [47379]: https://github.com/rust-lang/rust/pull/47379
2869 [47408]: https://github.com/rust-lang/rust/pull/47408
2870 [47813]: https://github.com/rust-lang/rust/pull/47813
2871 [48056]: https://github.com/rust-lang/rust/pull/48056
2872 [48125]: https://github.com/rust-lang/rust/pull/48125
2873 [48166]: https://github.com/rust-lang/rust/pull/48166
2874 [48235]: https://github.com/rust-lang/rust/pull/48235
2875 [48274]: https://github.com/rust-lang/rust/pull/48274
2876 [48281]: https://github.com/rust-lang/rust/pull/48281
2877 [48296]: https://github.com/rust-lang/rust/pull/48296
2878 [48326]: https://github.com/rust-lang/rust/pull/48326
2879 [48359]: https://github.com/rust-lang/rust/pull/48359
2880 [48404]: https://github.com/rust-lang/rust/pull/48404
2881 [48481]: https://github.com/rust-lang/rust/pull/48481
2882 [48516]: https://github.com/rust-lang/rust/pull/48516
2883 [48628]: https://github.com/rust-lang/rust/pull/48628
2884 [48629]: https://github.com/rust-lang/rust/pull/48629
2885 [48657]: https://github.com/rust-lang/rust/pull/48657
2886 [48735]: https://github.com/rust-lang/rust/pull/48735
2887 [48978]: https://github.com/rust-lang/rust/pull/48978
2888 [49101]: https://github.com/rust-lang/rust/pull/49101
2889 [49109]: https://github.com/rust-lang/rust/pull/49109
2890 [49121]: https://github.com/rust-lang/rust/pull/49121
2891 [49162]: https://github.com/rust-lang/rust/pull/49162
2892 [49184]: https://github.com/rust-lang/rust/pull/49184
2893 [49234]: https://github.com/rust-lang/rust/pull/49234
2894 [49255]: https://github.com/rust-lang/rust/pull/49255
2895 [49299]: https://github.com/rust-lang/rust/pull/49299
2896 [49305]: https://github.com/rust-lang/rust/pull/49305
2897 [49394]: https://github.com/rust-lang/rust/pull/49394
2898 [49458]: https://github.com/rust-lang/rust/pull/49458
2899 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2900 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2901 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2902 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2903 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2904 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2905 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2906 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2907 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2908 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2909 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2910 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2911 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2912 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2913 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2914 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2915 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2916 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2917 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2918 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2919 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2920 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2921 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2922 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2923 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2924 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2925 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2926 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2927 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2928 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2929 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2930 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2931 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2932 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2933 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2934 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2935 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2936 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2937 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2938 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2939 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2940 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2943 Version 1.25.0 (2018-03-29)
2944 ==========================
2948 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2949 - [You can now use nested groups of imports.][47948]
2950 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2951 - [You can now have `|` at the start of a match arm.][47947] e.g.
2953 enum Foo { A, B, C }
2959 | Foo::B => println!("AB"),
2960 | Foo::C => println!("C"),
2967 - [Upgraded to LLVM 6.][47828]
2968 - [Added `-C lto=val` option.][47521]
2969 - [Added `i586-unknown-linux-musl` target][47282]
2973 - [Impl Send for `process::Command` on Unix.][47760]
2974 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2975 - [`UnsafeCell::into_inner` is now safe.][47204]
2976 - [Implement libstd for CloudABI.][47268]
2977 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2978 - [Implement `AsRef<Path>` for Component][46985]
2979 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2980 - [Moved `Duration` to libcore.][46666]
2984 - [`Location::column`]
2987 The following functions can now be used in a constant expression.
2988 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2989 - [`Duration::new`][47300]
2990 - [`Duration::from_secs`][47300]
2991 - [`Duration::from_millis`][47300]
2995 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2996 - [`cargo new` now defaults to creating a binary crate, instead of a
2997 library crate.][cargo/5029]
3001 - [Rust by example is now shipped with new releases][46196]
3005 - [Deprecated `net::lookup_host`.][47510]
3006 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3007 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3008 around indexing operations (see [#47349][47349]). This has been fixed (which also
3009 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3010 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3012 [33903]: https://github.com/rust-lang/rust/pull/33903
3013 [47947]: https://github.com/rust-lang/rust/pull/47947
3014 [47948]: https://github.com/rust-lang/rust/pull/47948
3015 [47760]: https://github.com/rust-lang/rust/pull/47760
3016 [47790]: https://github.com/rust-lang/rust/pull/47790
3017 [47828]: https://github.com/rust-lang/rust/pull/47828
3018 [47398]: https://github.com/rust-lang/rust/pull/47398
3019 [47510]: https://github.com/rust-lang/rust/pull/47510
3020 [47521]: https://github.com/rust-lang/rust/pull/47521
3021 [47204]: https://github.com/rust-lang/rust/pull/47204
3022 [47251]: https://github.com/rust-lang/rust/pull/47251
3023 [47268]: https://github.com/rust-lang/rust/pull/47268
3024 [47282]: https://github.com/rust-lang/rust/pull/47282
3025 [47300]: https://github.com/rust-lang/rust/pull/47300
3026 [47349]: https://github.com/rust-lang/rust/pull/47349
3027 [46931]: https://github.com/rust-lang/rust/pull/46931
3028 [46985]: https://github.com/rust-lang/rust/pull/46985
3029 [47006]: https://github.com/rust-lang/rust/pull/47006
3030 [46830]: https://github.com/rust-lang/rust/pull/46830
3031 [46095]: https://github.com/rust-lang/rust/pull/46095
3032 [46666]: https://github.com/rust-lang/rust/pull/46666
3033 [46196]: https://github.com/rust-lang/rust/pull/46196
3034 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3035 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3036 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3037 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3038 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3041 Version 1.24.1 (2018-03-01)
3042 ==========================
3044 - [Do not abort when unwinding through FFI][48251]
3045 - [Emit UTF-16 files for linker arguments on Windows][48318]
3046 - [Make the error index generator work again][48308]
3047 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3049 [48251]: https://github.com/rust-lang/rust/issues/48251
3050 [48308]: https://github.com/rust-lang/rust/issues/48308
3051 [48318]: https://github.com/rust-lang/rust/issues/48318
3052 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3055 Version 1.24.0 (2018-02-15)
3056 ==========================
3060 - [External `sysv64` ffi is now available.][46528]
3061 eg. `extern "sysv64" fn foo () {}`
3065 - [rustc now uses 16 codegen units by default for release builds.][46910]
3066 For the fastest builds, utilize `codegen-units=1`.
3067 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3068 - [Add `aarch64-unknown-openbsd` support][46760]
3072 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3073 improvement in performance in the majority of cases.
3074 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3075 with Windows.][46798]
3076 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3077 - [impl `From<bool>` for `AtomicBool`][46293]
3078 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3079 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3080 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3081 - [float::from_bits now just uses transmute.][46012] This provides
3082 some optimisations from LLVM.
3083 - [Copied `AsciiExt` methods onto `char`][46077]
3084 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3085 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3086 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3087 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3091 - [`RefCell::replace`]
3093 - [`atomic::spin_loop_hint`]
3095 The following functions can now be used in a constant expression.
3096 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3098 - [`AtomicBool::new`][46287]
3099 - [`AtomicUsize::new`][46287]
3100 - [`AtomicIsize::new`][46287]
3101 - [`AtomicPtr::new`][46287]
3102 - [`Cell::new`][46287]
3103 - [`{integer}::min_value`][46287]
3104 - [`{integer}::max_value`][46287]
3105 - [`mem::size_of`][46287]
3106 - [`mem::align_of`][46287]
3107 - [`ptr::null`][46287]
3108 - [`ptr::null_mut`][46287]
3109 - [`RefCell::new`][46287]
3110 - [`UnsafeCell::new`][46287]
3114 - [Added a `workspace.default-members` config that
3115 overrides implied `--all` in virtual workspaces.][cargo/4743]
3116 - [Enable incremental by default on development builds.][cargo/4817] Also added
3117 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3118 per-project or global basis respectively.
3125 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3126 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3127 in accordance with IETF RFC 4291 §2.2.
3128 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3129 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3130 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3131 - [Leading zeros in tuple struct members is now an error][47084]
3132 - [`column!()` macro is one-based instead of zero-based][46977]
3133 - [`fmt::Arguments` can no longer be shared across threads][45198]
3134 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3135 - [Cargo sets a different working directory for the compiler][cargo/4788]
3137 [44884]: https://github.com/rust-lang/rust/pull/44884
3138 [45198]: https://github.com/rust-lang/rust/pull/45198
3139 [45506]: https://github.com/rust-lang/rust/pull/45506
3140 [45904]: https://github.com/rust-lang/rust/pull/45904
3141 [45990]: https://github.com/rust-lang/rust/pull/45990
3142 [46012]: https://github.com/rust-lang/rust/pull/46012
3143 [46077]: https://github.com/rust-lang/rust/pull/46077
3144 [46094]: https://github.com/rust-lang/rust/pull/46094
3145 [46284]: https://github.com/rust-lang/rust/pull/46284
3146 [46287]: https://github.com/rust-lang/rust/pull/46287
3147 [46293]: https://github.com/rust-lang/rust/pull/46293
3148 [46528]: https://github.com/rust-lang/rust/pull/46528
3149 [46671]: https://github.com/rust-lang/rust/pull/46671
3150 [46713]: https://github.com/rust-lang/rust/pull/46713
3151 [46735]: https://github.com/rust-lang/rust/pull/46735
3152 [46749]: https://github.com/rust-lang/rust/pull/46749
3153 [46760]: https://github.com/rust-lang/rust/pull/46760
3154 [46798]: https://github.com/rust-lang/rust/pull/46798
3155 [46828]: https://github.com/rust-lang/rust/pull/46828
3156 [46831]: https://github.com/rust-lang/rust/pull/46831
3157 [46833]: https://github.com/rust-lang/rust/pull/46833
3158 [46910]: https://github.com/rust-lang/rust/pull/46910
3159 [46977]: https://github.com/rust-lang/rust/pull/46977
3160 [47018]: https://github.com/rust-lang/rust/pull/47018
3161 [47080]: https://github.com/rust-lang/rust/pull/47080
3162 [47084]: https://github.com/rust-lang/rust/pull/47084
3163 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3164 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3165 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3166 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3167 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3168 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3171 Version 1.23.0 (2018-01-04)
3172 ==========================
3176 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3177 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3178 Which should fix some confusing errors in some operations.
3182 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3183 undefined behavior.][45920]
3184 - [rustc now suggests renaming import if names clash.][45660]
3185 - [Display errors/warnings correctly when there are zero-width or
3186 wide characters.][45711]
3187 - [rustc now avoids unnecessary copies of arguments that are
3188 simple bindings][45380] This should improve memory usage on average by 5-10%.
3189 - [Updated musl used to build musl rustc to 1.1.17][45393]
3193 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3194 - [Implement Hash for raw pointers to unsized types][45483]
3195 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3196 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3197 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3198 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3199 and `<*mut T>::as_mut`][44932]
3200 - [Optimized `Thread::{park, unpark}` implementation][45524]
3201 - [Improved `SliceExt::binary_search` performance.][45333]
3202 - [impl `FromIterator<()>` for `()`][45379]
3203 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3211 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3212 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3213 - [Added unit test checking to `cargo check`][cargo/4592]
3214 - [Cargo now lets you install a specific version
3215 using `cargo install --version`][cargo/4637]
3219 - [Releases now ship with the Cargo book documentation.][45692]
3220 - [rustdoc now prints rendering warnings on every run.][45324]
3224 - [Changes have been made to type equality to make it more correct,
3225 in rare cases this could break some code.][45853] [Tracking issue for
3226 further information][45852]
3227 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3228 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3229 Android 9, the minimum supported version is Android 14.
3230 - [Bumped the minimum LLVM to 3.9][45326]
3232 [44042]: https://github.com/rust-lang/rust/pull/44042
3233 [44932]: https://github.com/rust-lang/rust/pull/44932
3234 [45267]: https://github.com/rust-lang/rust/pull/45267
3235 [45324]: https://github.com/rust-lang/rust/pull/45324
3236 [45326]: https://github.com/rust-lang/rust/pull/45326
3237 [45333]: https://github.com/rust-lang/rust/pull/45333
3238 [45379]: https://github.com/rust-lang/rust/pull/45379
3239 [45380]: https://github.com/rust-lang/rust/pull/45380
3240 [45393]: https://github.com/rust-lang/rust/pull/45393
3241 [45435]: https://github.com/rust-lang/rust/pull/45435
3242 [45483]: https://github.com/rust-lang/rust/pull/45483
3243 [45524]: https://github.com/rust-lang/rust/pull/45524
3244 [45571]: https://github.com/rust-lang/rust/pull/45571
3245 [45580]: https://github.com/rust-lang/rust/pull/45580
3246 [45610]: https://github.com/rust-lang/rust/pull/45610
3247 [45660]: https://github.com/rust-lang/rust/pull/45660
3248 [45692]: https://github.com/rust-lang/rust/pull/45692
3249 [45711]: https://github.com/rust-lang/rust/pull/45711
3250 [45772]: https://github.com/rust-lang/rust/pull/45772
3251 [45852]: https://github.com/rust-lang/rust/issues/45852
3252 [45853]: https://github.com/rust-lang/rust/pull/45853
3253 [45887]: https://github.com/rust-lang/rust/pull/45887
3254 [45920]: https://github.com/rust-lang/rust/pull/45920
3255 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3256 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3257 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3260 Version 1.22.1 (2017-11-22)
3261 ==========================
3263 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3265 [46183]: https://github.com/rust-lang/rust/pull/46183
3267 Version 1.22.0 (2017-11-22)
3268 ==========================
3272 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3273 - [Now accepts underscores in unicode escapes][43716]
3274 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3275 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3279 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3280 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3281 This should decrease compile times for debug builds.
3282 - [strict memory alignment now enabled on ARMv6][45094]
3283 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3287 - [Allow atomic operations up to 32 bits
3288 on `armv5te_unknown_linux_gnueabi`][44978]
3289 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3290 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3291 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3292 - [Properly detect overflow in `Instant += Duration`.][44220]
3293 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3294 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3295 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3302 - [Cargo will now build multi file examples in subdirectories of the `examples`
3303 folder that have a `main.rs` file.][cargo/4496]
3304 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3305 the old format will continue to work and can be updated with `cargo update`.
3306 - [Now supports vendoring git repositories][cargo/3992]
3310 - [`libbacktrace` is now available on Apple platforms.][44251]
3311 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3312 This now lets you specify that a given code example will fail to compile.
3316 - [The minimum Android version that rustc can build for has been bumped
3317 to `4.0` from `2.3`][45656]
3318 - [Allowing `T op= &T` for numeric types has broken some type
3319 inference cases][45480]
3322 [42526]: https://github.com/rust-lang/rust/pull/42526
3323 [43017]: https://github.com/rust-lang/rust/pull/43017
3324 [43716]: https://github.com/rust-lang/rust/pull/43716
3325 [43949]: https://github.com/rust-lang/rust/pull/43949
3326 [44015]: https://github.com/rust-lang/rust/pull/44015
3327 [44220]: https://github.com/rust-lang/rust/pull/44220
3328 [44251]: https://github.com/rust-lang/rust/pull/44251
3329 [44287]: https://github.com/rust-lang/rust/pull/44287
3330 [44303]: https://github.com/rust-lang/rust/pull/44303
3331 [44456]: https://github.com/rust-lang/rust/pull/44456
3332 [44466]: https://github.com/rust-lang/rust/pull/44466
3333 [44895]: https://github.com/rust-lang/rust/pull/44895
3334 [44966]: https://github.com/rust-lang/rust/pull/44966
3335 [44978]: https://github.com/rust-lang/rust/pull/44978
3336 [45041]: https://github.com/rust-lang/rust/pull/45041
3337 [45064]: https://github.com/rust-lang/rust/pull/45064
3338 [45075]: https://github.com/rust-lang/rust/pull/45075
3339 [45094]: https://github.com/rust-lang/rust/pull/45094
3340 [45095]: https://github.com/rust-lang/rust/pull/45095
3341 [45480]: https://github.com/rust-lang/rust/issues/45480
3342 [45656]: https://github.com/rust-lang/rust/pull/45656
3343 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3344 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3345 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3352 Version 1.21.0 (2017-10-12)
3353 ==========================
3357 - [You can now use static references for literals.][43838]
3361 let x: &'static u32 = &0;
3364 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3367 my_macro!(Vec<i32>::new); // Always worked
3368 my_macro!(Vec::<i32>::new); // Now works
3373 - [Upgraded jemalloc to 4.5.0][43911]
3374 - [Enabled unwinding panics on Redox][43917]
3375 - [Now runs LLVM in parallel during translation phase.][43506]
3376 This should reduce peak memory usage.
3380 - [Generate builtin impls for `Clone` for all arrays and tuples that
3381 are `T: Clone`][43690]
3382 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3383 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3384 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3389 [`std::mem::discriminant`]
3393 - [You can now call `cargo install` with multiple package names][cargo/4216]
3394 - [Cargo commands inside a virtual workspace will now implicitly
3395 pass `--all`][cargo/4335]
3396 - [Added a `[patch]` section to `Cargo.toml` to handle
3397 prepublication dependencies][cargo/4123] [RFC 1969]
3398 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3399 like patterns][cargo/4270]
3400 - [Added the `--all-targets` option][cargo/4400]
3401 - [Using required dependencies as a feature is now deprecated and emits
3402 a warning][cargo/4364]
3407 - [Cargo docs are moving][43916]
3408 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3409 - [The rustdoc book is now available][43863]
3410 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3411 - [Added a preview of RLS has been made available through rustup][44204]
3412 Install with `rustup component add rls-preview`
3413 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3414 Previously only showed `std::os::unix`.
3418 - [Changes in method matching against higher-ranked types][43880] This may cause
3419 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3420 - [rustc's JSON error output's byte position start at top of file.][42973]
3421 Was previously relative to the rustc's internal `CodeMap` struct which
3422 required the unstable library `libsyntax` to correctly use.
3423 - [`unused_results` lint no longer ignores booleans][43728]
3425 [42565]: https://github.com/rust-lang/rust/pull/42565
3426 [42973]: https://github.com/rust-lang/rust/pull/42973
3427 [43348]: https://github.com/rust-lang/rust/pull/43348
3428 [43459]: https://github.com/rust-lang/rust/pull/43459
3429 [43506]: https://github.com/rust-lang/rust/pull/43506
3430 [43540]: https://github.com/rust-lang/rust/pull/43540
3431 [43690]: https://github.com/rust-lang/rust/pull/43690
3432 [43728]: https://github.com/rust-lang/rust/pull/43728
3433 [43838]: https://github.com/rust-lang/rust/pull/43838
3434 [43863]: https://github.com/rust-lang/rust/pull/43863
3435 [43880]: https://github.com/rust-lang/rust/pull/43880
3436 [43911]: https://github.com/rust-lang/rust/pull/43911
3437 [43916]: https://github.com/rust-lang/rust/pull/43916
3438 [43917]: https://github.com/rust-lang/rust/pull/43917
3439 [44204]: https://github.com/rust-lang/rust/pull/44204
3440 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3441 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3442 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3443 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3444 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3445 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3446 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3447 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3448 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3450 Version 1.20.0 (2017-08-31)
3451 ===========================
3455 - [Associated constants are now stabilised.][42809]
3456 - [A lot of macro bugs are now fixed.][42913]
3461 - [Struct fields are now properly coerced to the expected field type.][42807]
3462 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3463 `wasm32-experimental-emscripten` target.
3464 - [Changed some of the error messages to be more helpful.][42033]
3465 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3467 - [rustc now reports the total number of errors on compilation failure][43015]
3468 previously this was only the number of errors in the pass that failed.
3469 - [Expansion in rustc has been sped up 29x.][42533]
3470 - [added `msp430-none-elf` target.][43099]
3471 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3473 - [Fixes backtraces on Redox][43228]
3474 - [rustc now identifies different versions of same crate when absolute paths of
3475 different types match in an error message.][42826]
3481 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3482 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3484 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3485 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3486 - [Impl `Clone` for `DefaultHasher`.][42799]
3487 - [Impl `Sync` for `SyncSender`.][42397]
3488 - [Impl `FromStr` for `char`][42271]
3489 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3491 - [allow messages in the `unimplemented!()` macro.][42155]
3492 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3493 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3494 - [Upgrade to Unicode 10.0.0][42999]
3495 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3496 - [Skip the main thread's manual stack guard on Linux][43072]
3497 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3498 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3500 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3505 - [`CStr::into_c_string`]
3506 - [`CString::as_c_str`]
3507 - [`CString::into_boxed_c_str`]
3508 - [`Chain::get_mut`]
3509 - [`Chain::get_ref`]
3510 - [`Chain::into_inner`]
3511 - [`Option::get_or_insert_with`]
3512 - [`Option::get_or_insert`]
3513 - [`OsStr::into_os_string`]
3514 - [`OsString::into_boxed_os_str`]
3517 - [`Utf8Error::error_len`]
3518 - [`char::EscapeDebug`]
3519 - [`char::escape_debug`]
3520 - [`compile_error!`]
3521 - [`f32::from_bits`]
3523 - [`f64::from_bits`]
3525 - [`mem::ManuallyDrop`]
3526 - [`slice::sort_unstable_by_key`]
3527 - [`slice::sort_unstable_by`]
3528 - [`slice::sort_unstable`]
3529 - [`str::from_boxed_utf8_unchecked`]
3530 - [`str::as_bytes_mut`]
3531 - [`str::as_bytes_mut`]
3532 - [`str::from_utf8_mut`]
3533 - [`str::from_utf8_unchecked_mut`]
3535 - [`str::get_unchecked_mut`]
3536 - [`str::get_unchecked`]
3538 - [`str::into_boxed_bytes`]
3543 - [Cargo API token location moved from `~/.cargo/config` to
3544 `~/.cargo/credentials`.][cargo/3978]
3545 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3546 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3547 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3548 - [You can now specify version of a binary when installed through
3549 `cargo install` using `--vers`.][cargo/4229]
3550 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3551 failure.][cargo/4248]
3552 - [Changed the convention around which file is the crate root.][cargo/4259]
3553 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3554 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3559 - [Functions with `'static` in their return types will now not be as usable as
3560 if they were using lifetime parameters instead.][42417]
3561 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3562 takes the sign of NaN into account where previously didn't.][42430]
3564 [42033]: https://github.com/rust-lang/rust/pull/42033
3565 [42155]: https://github.com/rust-lang/rust/pull/42155
3566 [42271]: https://github.com/rust-lang/rust/pull/42271
3567 [42397]: https://github.com/rust-lang/rust/pull/42397
3568 [42417]: https://github.com/rust-lang/rust/pull/42417
3569 [42430]: https://github.com/rust-lang/rust/pull/42430
3570 [42431]: https://github.com/rust-lang/rust/pull/42431
3571 [42533]: https://github.com/rust-lang/rust/pull/42533
3572 [42571]: https://github.com/rust-lang/rust/pull/42571
3573 [42613]: https://github.com/rust-lang/rust/pull/42613
3574 [42799]: https://github.com/rust-lang/rust/pull/42799
3575 [42807]: https://github.com/rust-lang/rust/pull/42807
3576 [42809]: https://github.com/rust-lang/rust/pull/42809
3577 [42822]: https://github.com/rust-lang/rust/pull/42822
3578 [42826]: https://github.com/rust-lang/rust/pull/42826
3579 [42854]: https://github.com/rust-lang/rust/pull/42854
3580 [42913]: https://github.com/rust-lang/rust/pull/42913
3581 [42999]: https://github.com/rust-lang/rust/pull/42999
3582 [43011]: https://github.com/rust-lang/rust/pull/43011
3583 [43015]: https://github.com/rust-lang/rust/pull/43015
3584 [43072]: https://github.com/rust-lang/rust/pull/43072
3585 [43077]: https://github.com/rust-lang/rust/pull/43077
3586 [43097]: https://github.com/rust-lang/rust/pull/43097
3587 [43099]: https://github.com/rust-lang/rust/pull/43099
3588 [43170]: https://github.com/rust-lang/rust/pull/43170
3589 [43178]: https://github.com/rust-lang/rust/pull/43178
3590 [43185]: https://github.com/rust-lang/rust/pull/43185
3591 [43228]: https://github.com/rust-lang/rust/pull/43228
3592 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3593 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3594 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3595 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3596 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3597 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3598 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3599 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3600 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3601 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3602 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3603 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3604 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3605 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3606 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3607 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3608 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3609 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3610 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3611 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3612 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3613 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3614 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3615 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3616 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3617 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3618 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3619 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3620 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3621 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3622 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3623 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3624 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3625 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3626 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3627 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3628 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3629 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3630 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3633 Version 1.19.0 (2017-07-20)
3634 ===========================
3639 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3640 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3641 - [Macro recursion limit increased to 1024 from 64.][41676]
3642 - [Added lint for detecting unused macros.][41907]
3643 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3644 For example: `let x = loop { break 7; };`
3645 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3646 contain `Copy` types and cannot have a `Drop` implementation.
3647 Example: `union Foo { bar: u8, baz: usize }`
3648 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3649 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3654 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3655 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3656 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3657 you should use `--target armv7-linux-androideabi`.
3658 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3659 - [Minor optimisation of string operations.][42037]
3660 - [Compiler error message is now `aborting due to previous error(s)` instead of
3661 `aborting due to N previous errors`][42150] This was previously inaccurate and
3662 would only count certain kinds of errors.
3663 - [The compiler now supports Visual Studio 2017][42225]
3664 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3665 - [Added a lot][42264] of [new error codes][42302]
3666 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3667 libraries with C Run-time Libraries(CRT) to be statically linked.
3668 - [Fixed various ARM codegen bugs][42740]
3673 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3674 `Extend<Cow<'a, str>>`][41449]
3675 - [`Vec` now implements `From<&mut [T]>`][41530]
3676 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3677 - [`SplitWhitespace` now implements `Clone`][41659]
3678 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3680 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3681 macros, but for printing to stderr.
3686 - [`OsString::shrink_to_fit`]
3689 - [`thread::ThreadId`]
3694 - [Build scripts can now add environment variables to the environment
3695 the crate is being compiled in.
3696 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3697 - [Subcommands now replace the current process rather than spawning a new
3698 child process][cargo/3970]
3699 - [Workspace members can now accept glob file patterns][cargo/3979]
3700 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3701 the members in a given workspace.][cargo/3988]
3702 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3703 - [Target directory path is now in the cargo metadata][cargo/4022]
3704 - [Cargo no longer checks out a local working directory for the
3705 crates.io index][cargo/4026] This should provide smaller file size for the
3706 registry, and improve cloning times, especially on Windows machines.
3707 - [Added an `--exclude` option for excluding certain packages when using the
3708 `--all` option][cargo/4031]
3709 - [Cargo will now automatically retry when receiving a 5xx error
3710 from crates.io][cargo/4032]
3711 - [The `--features` option now accepts multiple comma or space
3712 delimited values.][cargo/4084]
3713 - [Added support for custom target specific runners][cargo/3954]
3718 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3720 - [Rust will now release XZ compressed packages][rust-installer/57]
3721 - [rustup will now prefer to download rust packages with
3722 XZ compression][rustup/1100] over GZip packages.
3723 - [Added the ability to escape `#` in rust documentation][41785] By adding
3724 additional `#`'s ie. `##` is now `#`
3729 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3730 - [`-Z` flags are now no longer allowed to be used on the stable
3731 compiler.][41751] This has been a warning for a year previous to this.
3732 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3733 longer works][42844]. Users should migrate to the built-in `check`
3734 command, which has been available since 1.16.
3735 - [Ending a float literal with `._` is now a hard error.
3736 Example: `42._` .][41946]
3737 - [Any use of a private `extern crate` outside of its module is now a
3738 hard error.][36886] This was previously a warning.
3739 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3740 relative while the `::` prefix makes a path absolute, but was ignored and the
3741 path was relative regardless.
3742 - [Floating point constants in match patterns is now a hard error][36890]
3743 This was previously a warning.
3744 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3745 match patterns is now a hard error][36891] This was previously a warning.
3746 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3748 - [From the pound escape, lines consisting of multiple `#`s are
3750 - [It is an error to re-export private enum variants][42460]. This is
3751 known to break a number of crates that depend on an older version of
3753 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3754 to use it to find the linker, and the build will fail where it did
3755 not previously][42607]
3757 [36886]: https://github.com/rust-lang/rust/issues/36886
3758 [36888]: https://github.com/rust-lang/rust/issues/36888
3759 [36890]: https://github.com/rust-lang/rust/issues/36890
3760 [36891]: https://github.com/rust-lang/rust/issues/36891
3761 [36892]: https://github.com/rust-lang/rust/issues/36892
3762 [37406]: https://github.com/rust-lang/rust/issues/37406
3763 [39983]: https://github.com/rust-lang/rust/pull/39983
3764 [41145]: https://github.com/rust-lang/rust/pull/41145
3765 [41192]: https://github.com/rust-lang/rust/pull/41192
3766 [41258]: https://github.com/rust-lang/rust/pull/41258
3767 [41370]: https://github.com/rust-lang/rust/pull/41370
3768 [41449]: https://github.com/rust-lang/rust/pull/41449
3769 [41530]: https://github.com/rust-lang/rust/pull/41530
3770 [41624]: https://github.com/rust-lang/rust/pull/41624
3771 [41656]: https://github.com/rust-lang/rust/pull/41656
3772 [41659]: https://github.com/rust-lang/rust/pull/41659
3773 [41676]: https://github.com/rust-lang/rust/pull/41676
3774 [41751]: https://github.com/rust-lang/rust/pull/41751
3775 [41764]: https://github.com/rust-lang/rust/pull/41764
3776 [41785]: https://github.com/rust-lang/rust/pull/41785
3777 [41873]: https://github.com/rust-lang/rust/pull/41873
3778 [41907]: https://github.com/rust-lang/rust/pull/41907
3779 [41946]: https://github.com/rust-lang/rust/pull/41946
3780 [42016]: https://github.com/rust-lang/rust/pull/42016
3781 [42037]: https://github.com/rust-lang/rust/pull/42037
3782 [42068]: https://github.com/rust-lang/rust/pull/42068
3783 [42150]: https://github.com/rust-lang/rust/pull/42150
3784 [42162]: https://github.com/rust-lang/rust/pull/42162
3785 [42225]: https://github.com/rust-lang/rust/pull/42225
3786 [42264]: https://github.com/rust-lang/rust/pull/42264
3787 [42302]: https://github.com/rust-lang/rust/pull/42302
3788 [42460]: https://github.com/rust-lang/rust/issues/42460
3789 [42607]: https://github.com/rust-lang/rust/issues/42607
3790 [42740]: https://github.com/rust-lang/rust/pull/42740
3791 [42844]: https://github.com/rust-lang/rust/issues/42844
3792 [42948]: https://github.com/rust-lang/rust/pull/42948
3793 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3794 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3795 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3796 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3797 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3798 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3799 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3800 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3801 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3802 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3803 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3804 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3805 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3806 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3807 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3808 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3809 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3810 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3811 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3812 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3813 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3814 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3817 Version 1.18.0 (2017-06-08)
3818 ===========================
3823 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3824 make the item visible to just that module tree. Also accepts the keyword
3825 `crate` to make something public to the whole crate but not users of the
3826 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3827 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3828 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3829 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3830 types like `Write + Send`, trailing `+` are now supported in trait objects,
3831 and better error reporting for trait objects starting with `?Sized`.
3832 - [0e+10 is now a valid floating point literal][40589]
3833 - [Now warns if you bind a lifetime parameter to 'static][40734]
3834 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3835 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3836 representation in some cases.][40377]
3841 - [rustc can now emit mir with `--emit mir`][39891]
3842 - [Improved LLVM IR for trivial functions][40367]
3843 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3844 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3845 opportunities found through profiling
3846 - [Improved backtrace formatting when panicking][38165]
3851 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3852 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3853 iteration or reallocation.
3854 - [Simplified HashMap Bucket interface][40561] provides performance
3855 improvements for iterating and cloning.
3856 - [Specialize Vec::from_elem to use calloc][40409]
3857 - [Fixed Race condition in fs::create_dir_all][39799]
3858 - [No longer caching stdio on Windows][40516]
3859 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3860 2.50%~ faster and in one case now 12.50% faster.
3861 - [Optimized `AtomicBool::fetch_nand`][41143]
3866 - [`Child::try_wait`]
3867 - [`HashMap::retain`]
3868 - [`HashSet::retain`]
3870 - [`TcpStream::peek`]
3871 - [`UdpSocket::peek`]
3872 - [`UdpSocket::peek_from`]
3877 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3878 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3879 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3880 - [Added Android build support][cargo/3885]
3881 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3882 of a certain type, for example `cargo build --bins` will build all
3884 - [Added support for haiku][cargo/3952]
3889 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3890 - [Added rust-windbg script for better debugging on Windows][39983]
3891 - [Rust now uses the official cross compiler for NetBSD][40612]
3892 - [rustdoc now accepts `#` at the start of files][40828]
3893 - [Fixed jemalloc support for musl][41168]
3898 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3899 always placed after the sign if it exists and before the digits. With the `#`
3900 flag the zeroes are placed after the prefix and before the digits.
3901 - [Due to the struct field optimisation][40377], using `transmute` on structs
3902 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3903 always been undefined behavior, but is now more likely to break in practice.
3904 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3905 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3906 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3907 - [Overlapping inherent `impl`s are now a hard error][40728]
3908 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3909 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3910 `out.asm` and `out.ll` instead of only one of the filetypes.
3911 - [ calling a function that returns `Self` will no longer work][41805] when
3912 the size of `Self` cannot be statically determined.
3913 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3914 this has caused a few regressions namely:
3916 - Changed the link order of local static/dynamic libraries (respecting the
3917 order on given rather than having the compiler reorder).
3918 - Changed how MinGW is linked, native code linked to dynamic libraries
3919 may require manually linking to the gcc support library (for the native
3922 [38165]: https://github.com/rust-lang/rust/pull/38165
3923 [39799]: https://github.com/rust-lang/rust/pull/39799
3924 [39891]: https://github.com/rust-lang/rust/pull/39891
3925 [39983]: https://github.com/rust-lang/rust/pull/39983
3926 [40043]: https://github.com/rust-lang/rust/pull/40043
3927 [40241]: https://github.com/rust-lang/rust/pull/40241
3928 [40338]: https://github.com/rust-lang/rust/pull/40338
3929 [40367]: https://github.com/rust-lang/rust/pull/40367
3930 [40377]: https://github.com/rust-lang/rust/pull/40377
3931 [40409]: https://github.com/rust-lang/rust/pull/40409
3932 [40516]: https://github.com/rust-lang/rust/pull/40516
3933 [40556]: https://github.com/rust-lang/rust/pull/40556
3934 [40561]: https://github.com/rust-lang/rust/pull/40561
3935 [40589]: https://github.com/rust-lang/rust/pull/40589
3936 [40612]: https://github.com/rust-lang/rust/pull/40612
3937 [40723]: https://github.com/rust-lang/rust/pull/40723
3938 [40728]: https://github.com/rust-lang/rust/pull/40728
3939 [40731]: https://github.com/rust-lang/rust/pull/40731
3940 [40734]: https://github.com/rust-lang/rust/pull/40734
3941 [40805]: https://github.com/rust-lang/rust/pull/40805
3942 [40807]: https://github.com/rust-lang/rust/pull/40807
3943 [40828]: https://github.com/rust-lang/rust/pull/40828
3944 [40870]: https://github.com/rust-lang/rust/pull/40870
3945 [41085]: https://github.com/rust-lang/rust/pull/41085
3946 [41143]: https://github.com/rust-lang/rust/pull/41143
3947 [41168]: https://github.com/rust-lang/rust/pull/41168
3948 [41270]: https://github.com/rust-lang/rust/issues/41270
3949 [41469]: https://github.com/rust-lang/rust/pull/41469
3950 [41805]: https://github.com/rust-lang/rust/issues/41805
3951 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3952 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3953 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3954 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3955 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3956 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3957 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3958 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3959 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3960 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3961 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3962 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3963 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3964 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3967 Version 1.17.0 (2017-04-27)
3968 ===========================
3973 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3974 * [Fields of structs may be initialized without duplicating the field/variable
3975 names][39761]. [RFC 1682]
3976 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3977 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3978 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3979 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3980 `'b`. Soundness fix.
3981 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3982 * [Static variables may contain references to other statics][40027]
3987 * [Exit quickly on only `--emit dep-info`][40336]
3988 * [Make `-C relocation-model` more correctly determine whether the linker
3989 creates a position-independent executable][40245]
3990 * [Add `-C overflow-checks` to directly control whether integer overflow
3992 * [The rustc type checker now checks items on demand instead of in a single
3993 in-order pass][40008]. This is mostly an internal refactoring in support of
3994 future work, including incremental type checking, but also resolves [RFC
3995 1647], allowing `Self` to appear in `impl` `where` clauses.
3996 * [Optimize vtable loads][39995]
3997 * [Turn off vectorization for Emscripten targets][39990]
3998 * [Provide suggestions for unknown macros imported with `use`][39953]
3999 * [Fix ICEs in path resolution][39939]
4000 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4001 * [Add clearer error message using `&str + &str`][39116]
4012 * [`Ordering::then`]
4013 * [`Ordering::then_with`]
4014 * [`BTreeMap::range`]
4015 * [`BTreeMap::range_mut`]
4016 * [`collections::Bound`]
4017 * [`process::abort`]
4018 * [`ptr::read_unaligned`]
4019 * [`ptr::write_unaligned`]
4020 * [`Result::expect_err`]
4023 * [`Cell::into_inner`]
4029 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4030 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4031 * [`String` implements `FromIterator<&char>`][40028]
4032 * `Box` [implements][40009] a number of new conversions:
4033 `From<Box<str>> for String`,
4034 `From<Box<[T]>> for Vec<T>`,
4035 `From<Box<CStr>> for CString`,
4036 `From<Box<OsStr>> for OsString`,
4037 `From<Box<Path>> for PathBuf`,
4038 `Into<Box<str>> for String`,
4039 `Into<Box<[T]>> for Vec<T>`,
4040 `Into<Box<CStr>> for CString`,
4041 `Into<Box<OsStr>> for OsString`,
4042 `Into<Box<Path>> for PathBuf`,
4043 `Default for Box<str>`,
4044 `Default for Box<CStr>`,
4045 `Default for Box<OsStr>`,
4046 `From<&CStr> for Box<CStr>`,
4047 `From<&OsStr> for Box<OsStr>`,
4048 `From<&Path> for Box<Path>`
4049 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4050 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4051 * [Slightly optimize `slice::sort`][39538]
4052 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4053 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4054 `Box<str>` implements `From<&str>`][39438]
4055 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4056 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4057 * [`format!` estimates the needed capacity before writing a string][39356]
4058 * [Support unprivileged symlink creation in Windows][38921]
4059 * [`PathBuf` implements `Default`][38764]
4060 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4061 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4062 and poor hash functions.
4067 * [Add `cargo check --all`][cargo/3731]
4068 * [Add an option to ignore SSL revocation checking][cargo/3699]
4069 * [Add `cargo run --package`][cargo/3691]
4070 * [Add `required_features`][cargo/3667]
4071 * [Assume `build.rs` is a build script][cargo/3664]
4072 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4077 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4079 * [The "Unstable Book" documents nightly-only features][ubook]
4080 * [Improve the style of the sidebar in rustdoc output][40265]
4081 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4082 * [Fix MSP430 breakage due to `i128`][40257]
4083 * [Preliminary Solaris/SPARCv9 support][39903]
4084 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4085 run without installing the MSVC runtime.
4086 * [`rustdoc --test` includes file names in test names][39788]
4087 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4088 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4089 * [Initial support for `aarch64-unknown-freebsd`][39491]
4090 * [Initial support for `i686-unknown-netbsd`][39426]
4091 * [This release no longer includes the old makefile build system][39431]. Rust
4092 is built with a custom build system, written in Rust, and with Cargo.
4093 * [Add Debug implementations for libcollection structs][39002]
4094 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4095 * [`--test-threads=0` produces an error][38945]
4096 * [`rustup` installs documentation by default][40526]
4097 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4098 WinDbg and Visual Studio to improve the debugging experience.
4103 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4104 workaround, either use MSVC 2015 or run vcvars.bat.
4105 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4106 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4107 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4109 * [`format!` and `Display::to_string` panic if an underlying formatting
4110 implementation returns an error][40117]. Previously the error was silently
4111 ignored. It is incorrect for `write_fmt` to return an error when writing
4113 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4114 crates were marked stable and could be accessed from the stable toolchain.
4115 * [Rust git source no longer includes vendored crates][39728]. Those that need
4116 to build with vendored crates should build from release tarballs.
4117 * [Fix inert attributes from `proc_macro_derives`][39572]
4118 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4119 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4121 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4122 existing code generally ignores the type of dead-code unless a type-hint is
4123 provided; this can cause surprising inference interactions particularly around
4124 defaulting. The new code uniformly ignores the result type of dead-code.
4125 * [Tuple-struct constructors with private fields are no longer visible][38932]
4126 * [Lifetime parameters that do not appear in the arguments are now considered
4127 early-bound][38897], resolving a soundness bug (#[32330]). The
4128 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4130 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4131 * [Make transmuting from fn item types to pointer-sized types a hard
4134 [27787]: https://github.com/rust-lang/rust/issues/27787
4135 [32330]: https://github.com/rust-lang/rust/issues/32330
4136 [34198]: https://github.com/rust-lang/rust/pull/34198
4137 [38161]: https://github.com/rust-lang/rust/pull/38161
4138 [38368]: https://github.com/rust-lang/rust/pull/38368
4139 [38584]: https://github.com/rust-lang/rust/issues/38584
4140 [38661]: https://github.com/rust-lang/rust/pull/38661
4141 [38764]: https://github.com/rust-lang/rust/pull/38764
4142 [38864]: https://github.com/rust-lang/rust/issues/38864
4143 [38897]: https://github.com/rust-lang/rust/pull/38897
4144 [38921]: https://github.com/rust-lang/rust/pull/38921
4145 [38932]: https://github.com/rust-lang/rust/pull/38932
4146 [38945]: https://github.com/rust-lang/rust/pull/38945
4147 [38981]: https://github.com/rust-lang/rust/pull/38981
4148 [39002]: https://github.com/rust-lang/rust/pull/39002
4149 [39116]: https://github.com/rust-lang/rust/pull/39116
4150 [39193]: https://github.com/rust-lang/rust/pull/39193
4151 [39265]: https://github.com/rust-lang/rust/pull/39265
4152 [39356]: https://github.com/rust-lang/rust/pull/39356
4153 [39372]: https://github.com/rust-lang/rust/pull/39372
4154 [39426]: https://github.com/rust-lang/rust/pull/39426
4155 [39431]: https://github.com/rust-lang/rust/pull/39431
4156 [39438]: https://github.com/rust-lang/rust/pull/39438
4157 [39440]: https://github.com/rust-lang/rust/pull/39440
4158 [39485]: https://github.com/rust-lang/rust/pull/39485
4159 [39491]: https://github.com/rust-lang/rust/pull/39491
4160 [39518]: https://github.com/rust-lang/rust/pull/39518
4161 [39538]: https://github.com/rust-lang/rust/pull/39538
4162 [39572]: https://github.com/rust-lang/rust/pull/39572
4163 [39633]: https://github.com/rust-lang/rust/pull/39633
4164 [39642]: https://github.com/rust-lang/rust/pull/39642
4165 [39728]: https://github.com/rust-lang/rust/pull/39728
4166 [39761]: https://github.com/rust-lang/rust/pull/39761
4167 [39788]: https://github.com/rust-lang/rust/pull/39788
4168 [39793]: https://github.com/rust-lang/rust/pull/39793
4169 [39837]: https://github.com/rust-lang/rust/pull/39837
4170 [39843]: https://github.com/rust-lang/rust/pull/39843
4171 [39851]: https://github.com/rust-lang/rust/pull/39851
4172 [39903]: https://github.com/rust-lang/rust/pull/39903
4173 [39939]: https://github.com/rust-lang/rust/pull/39939
4174 [39953]: https://github.com/rust-lang/rust/pull/39953
4175 [39960]: https://github.com/rust-lang/rust/pull/39960
4176 [39990]: https://github.com/rust-lang/rust/pull/39990
4177 [39995]: https://github.com/rust-lang/rust/pull/39995
4178 [40008]: https://github.com/rust-lang/rust/pull/40008
4179 [40009]: https://github.com/rust-lang/rust/pull/40009
4180 [40027]: https://github.com/rust-lang/rust/pull/40027
4181 [40028]: https://github.com/rust-lang/rust/pull/40028
4182 [40037]: https://github.com/rust-lang/rust/pull/40037
4183 [40117]: https://github.com/rust-lang/rust/pull/40117
4184 [40166]: https://github.com/rust-lang/rust/pull/40166
4185 [40245]: https://github.com/rust-lang/rust/pull/40245
4186 [40257]: https://github.com/rust-lang/rust/pull/40257
4187 [40261]: https://github.com/rust-lang/rust/pull/40261
4188 [40265]: https://github.com/rust-lang/rust/pull/40265
4189 [40319]: https://github.com/rust-lang/rust/pull/40319
4190 [40336]: https://github.com/rust-lang/rust/pull/40336
4191 [40526]: https://github.com/rust-lang/rust/pull/40526
4192 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4193 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4194 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4195 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4196 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4197 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4198 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4199 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4200 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4201 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4202 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4203 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4204 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4205 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4206 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4207 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4208 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4209 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4210 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4211 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4212 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4213 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4214 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4215 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4216 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4217 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4218 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4219 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4220 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4221 [mdbook]: https://crates.io/crates/mdbook
4222 [ubook]: https://doc.rust-lang.org/unstable-book/
4225 Version 1.16.0 (2017-03-16)
4226 ===========================
4231 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4232 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4233 match patterns][38069]
4234 * [Clean up semantics of `self` in an import list][38313]
4235 * [`Self` may appear in `impl` headers][38920]
4236 * [`Self` may appear in struct expressions][39282]
4241 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4242 a `.rmeta` file containing only crate metadata][38571]. This can be
4243 used by tools like the Rust Language Service to perform
4244 metadata-only builds.
4245 * [Levenshtein based typo suggestions now work in most places, while
4246 previously they worked only for fields and sometimes for local
4247 variables][38927]. Together with the overhaul of "no
4248 resolution"/"unexpected resolution" errors (#[38154]) they result in
4249 large and systematic improvement in resolution diagnostics.
4250 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4252 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4253 * [`rustc` no longer attempts to provide "consider using an explicit
4254 lifetime" suggestions][37057]. They were inaccurate.
4259 * [`VecDeque::truncate`]
4260 * [`VecDeque::resize`]
4261 * [`String::insert_str`]
4262 * [`Duration::checked_add`]
4263 * [`Duration::checked_sub`]
4264 * [`Duration::checked_div`]
4265 * [`Duration::checked_mul`]
4268 * [`SocketAddr::is_ipv4`]
4269 * [`SocketAddr::is_ipv6`]
4270 * [`IpAddr::is_ipv4`]
4271 * [`IpAddr::is_ipv6`]
4273 * [`Vec::dedup_by_key`]
4274 * [`Result::unwrap_or_default`]
4275 * [`<*const T>::wrapping_offset`]
4276 * [`<*mut T>::wrapping_offset`]
4277 * `CommandExt::creation_flags`
4278 * [`File::set_permissions`]
4279 * [`String::split_off`]
4284 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4285 their argument by `Borrow` parameter][37761]
4286 * [All public types in std implement `Debug`][38006]
4287 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4288 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4289 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4291 * [std: Fix partial writes in `LineWriter`][38062]
4292 * [std: Clamp max read/write sizes on Unix][38062]
4293 * [Use more specific panic message for `&str` slicing errors][38066]
4294 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4295 functionality cannot be achieved in std currently.
4296 * [`writeln!`, like `println!`, now accepts a form with no string
4297 or formatting arguments, to just print a newline][38469]
4298 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4299 * [Reduce the size of static data in `std_unicode::tables`][38781]
4300 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4301 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4303 * [`Duration` implements `Sum`][38712]
4304 * [`String` implements `ToSocketAddrs`][39048]
4309 * [The `cargo check` command does a type check of a project without
4310 building it][cargo/3296]
4311 * [crates.io will display CI badges from Travis and AppVeyor, if
4312 specified in Cargo.toml][cargo/3546]
4313 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4314 * [Compilation profiles accept integer values for `debug`, in addition
4315 to `true` and `false`. These are passed to `rustc` as the value to
4316 `-C debuginfo`][cargo/3534]
4317 * [Implement `cargo --version --verbose`][cargo/3604]
4318 * [All builds now output 'dep-info' build dependencies compatible with
4319 make and ninja][cargo/3557]
4320 * [Build all workspace members with `build --all`][cargo/3511]
4321 * [Document all workspace members with `doc --all`][cargo/3515]
4322 * [Path deps outside workspace are not members][cargo/3443]
4327 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4328 the path to the Rust implementation][38589]
4329 * [The `armv7-linux-androideabi` target no longer enables NEON
4330 extensions, per Google's ABI guide][38413]
4331 * [The stock standard library can be compiled for Redox OS][38401]
4332 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4334 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4336 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4341 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4342 match patterns][38069]
4343 * In this release, references to uninhabited types can not be
4344 pattern-matched. This was accidentally allowed in 1.15.
4345 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4346 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4348 * [Clean up semantics of `self` in an import list][38313]
4349 * Reimplemented lifetime elision. This change was almost entirely compatible
4350 with existing code, but it did close a number of small bugs and loopholes,
4351 as well as being more accepting in some other [cases][41105].
4353 [37057]: https://github.com/rust-lang/rust/pull/37057
4354 [37761]: https://github.com/rust-lang/rust/pull/37761
4355 [38006]: https://github.com/rust-lang/rust/pull/38006
4356 [38051]: https://github.com/rust-lang/rust/pull/38051
4357 [38062]: https://github.com/rust-lang/rust/pull/38062
4358 [38062]: https://github.com/rust-lang/rust/pull/38622
4359 [38066]: https://github.com/rust-lang/rust/pull/38066
4360 [38069]: https://github.com/rust-lang/rust/pull/38069
4361 [38131]: https://github.com/rust-lang/rust/pull/38131
4362 [38154]: https://github.com/rust-lang/rust/pull/38154
4363 [38274]: https://github.com/rust-lang/rust/pull/38274
4364 [38304]: https://github.com/rust-lang/rust/pull/38304
4365 [38313]: https://github.com/rust-lang/rust/pull/38313
4366 [38314]: https://github.com/rust-lang/rust/pull/38314
4367 [38327]: https://github.com/rust-lang/rust/pull/38327
4368 [38401]: https://github.com/rust-lang/rust/pull/38401
4369 [38413]: https://github.com/rust-lang/rust/pull/38413
4370 [38469]: https://github.com/rust-lang/rust/pull/38469
4371 [38559]: https://github.com/rust-lang/rust/pull/38559
4372 [38571]: https://github.com/rust-lang/rust/pull/38571
4373 [38580]: https://github.com/rust-lang/rust/pull/38580
4374 [38589]: https://github.com/rust-lang/rust/pull/38589
4375 [38670]: https://github.com/rust-lang/rust/pull/38670
4376 [38712]: https://github.com/rust-lang/rust/pull/38712
4377 [38726]: https://github.com/rust-lang/rust/pull/38726
4378 [38781]: https://github.com/rust-lang/rust/pull/38781
4379 [38798]: https://github.com/rust-lang/rust/pull/38798
4380 [38909]: https://github.com/rust-lang/rust/pull/38909
4381 [38920]: https://github.com/rust-lang/rust/pull/38920
4382 [38927]: https://github.com/rust-lang/rust/pull/38927
4383 [39048]: https://github.com/rust-lang/rust/pull/39048
4384 [39282]: https://github.com/rust-lang/rust/pull/39282
4385 [39379]: https://github.com/rust-lang/rust/pull/39379
4386 [41105]: https://github.com/rust-lang/rust/issues/41105
4387 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4388 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4389 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4390 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4391 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4392 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4393 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4394 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4395 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4396 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4397 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4398 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4399 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4400 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4401 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4402 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4403 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4404 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4405 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4406 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4407 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4408 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4409 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4410 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4411 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4412 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4413 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4414 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4415 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4416 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4419 Version 1.15.1 (2017-02-09)
4420 ===========================
4422 * [Fix IntoIter::as_mut_slice's signature][39466]
4423 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4425 [39466]: https://github.com/rust-lang/rust/pull/39466
4426 [39523]: https://github.com/rust-lang/rust/pull/39523
4429 Version 1.15.0 (2017-02-02)
4430 ===========================
4435 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4436 stable. This allows popular code-generating crates like Serde and Diesel to
4437 work ergonomically. [RFC 1681].
4438 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4439 with curly braces][36868]. Part of [RFC 1506].
4440 * [A number of minor changes to name resolution have been activated][37127].
4441 They add up to more consistent semantics, allowing for future evolution of
4442 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4443 details of what is different. The breaking changes here have been transitioned
4444 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4445 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4447 * [`?Sized` can be used in `where` clauses][37791]
4448 * [There is now a limit on the size of monomorphized types and it can be
4449 modified with the `#![type_size_limit]` crate attribute, similarly to
4450 the `#![recursion_limit]` attribute][37789]
4455 * [On Windows, the compiler will apply dllimport attributes when linking to
4456 extern functions][37973]. Additional attributes and flags can control which
4457 library kind is linked and its name. [RFC 1717].
4458 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4459 * [The `--test` flag works with procedural macro crates][38107]
4460 * [Fix `extern "aapcs" fn` ABI][37814]
4461 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4462 * [The `format!` expander recognizes incorrect `printf` and shell-style
4463 formatting directives and suggests the correct format][37613].
4464 * [Only report one error for all unused imports in an import list][37456]
4466 Compiler Performance
4467 --------------------
4469 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4470 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4471 * [Don't clone in `UnificationTable::probe`][37848]
4472 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4473 * [Use small vectors in type walker][37760]
4474 * [Macro expansion performance was improved][37701]
4475 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4476 * [Replace FNV with a faster hash function][37229]
4481 * [`std::iter::Iterator::min_by`]
4482 * [`std::iter::Iterator::max_by`]
4483 * [`std::os::*::fs::FileExt`]
4484 * [`std::sync::atomic::Atomic*::get_mut`]
4485 * [`std::sync::atomic::Atomic*::into_inner`]
4486 * [`std::vec::IntoIter::as_slice`]
4487 * [`std::vec::IntoIter::as_mut_slice`]
4488 * [`std::sync::mpsc::Receiver::try_iter`]
4489 * [`std::os::unix::process::CommandExt::before_exec`]
4490 * [`std::rc::Rc::strong_count`]
4491 * [`std::rc::Rc::weak_count`]
4492 * [`std::sync::Arc::strong_count`]
4493 * [`std::sync::Arc::weak_count`]
4494 * [`std::char::encode_utf8`]
4495 * [`std::char::encode_utf16`]
4496 * [`std::cell::Ref::clone`]
4497 * [`std::io::Take::into_inner`]
4502 * [The standard sorting algorithm has been rewritten for dramatic performance
4503 improvements][38192]. It is a hybrid merge sort, drawing influences from
4504 Timsort. Previously it was a naive merge sort.
4505 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4506 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4508 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4509 and `char_indices().last()`][37882]
4510 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4511 * [Chinese characters display correctly in `fmt::Debug`][37855]
4512 * [Derive `Default` for `Duration`][37699]
4513 * [Support creation of anonymous pipes on WinXP/2k][37677]
4514 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4515 * [Don't pass overlapped handles to processes][38835]
4520 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4521 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4522 should instead check the variable at runtime with `std::env`. That the value
4523 was set at build time was a bug, and incorrect when cross-compiling. This
4524 change is known to cause breakage.
4525 * [Add `--all` flag to `cargo test`][cargo/3221]
4526 * [Compile statically against the MSVC CRT][cargo/3363]
4527 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4528 * [Link OpenSSL statically on OSX][cargo/3311]
4529 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4530 * [Test for bad path overrides with summaries][cargo/3336]
4531 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4532 * [Fix retrying crate downloads for network errors][cargo/3348]
4533 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4534 * [Emit more info on --message-format=json][cargo/3319]
4535 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4536 * [Don't ignore errors in workspace manifest][cargo/3409]
4537 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4542 * [Test runners (binaries built with `--test`) now support a `--list` argument
4543 that lists the tests it contains][38185]
4544 * [Test runners now support a `--exact` argument that makes the test filter
4545 match exactly, instead of matching only a substring of the test name][38181]
4546 * [rustdoc supports a `--playground-url` flag][37763]
4547 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4552 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4553 continue to be used in this release by passing `--disable-rustbuild` to the
4554 configure script, but they will be deleted soon. Note that the new build
4555 system uses a different on-disk layout that will likely affect any scripts
4557 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4559 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4560 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4566 * [A number of minor changes to name resolution have been activated][37127].
4567 They add up to more consistent semantics, allowing for future evolution of
4568 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4569 details of what is different. The breaking changes here have been transitioned
4570 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4571 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4572 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4573 should instead check the variable at runtime with `std::env`. That the value
4574 was set at build time was a bug, and incorrect when cross-compiling. This
4575 change is known to cause breakage.
4576 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4577 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4578 1.10 and is now an error by default. It will become a hard error in the near
4580 * [The semantics relating modules to file system directories are changing in
4581 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4582 lint, which is a warning in this release, and will become a hard error in the
4584 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4585 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4586 the underlying iterator][37834]
4588 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4589 [33685]: https://github.com/rust-lang/rust/issues/33685
4590 [36868]: https://github.com/rust-lang/rust/pull/36868
4591 [37127]: https://github.com/rust-lang/rust/pull/37127
4592 [37229]: https://github.com/rust-lang/rust/pull/37229
4593 [37456]: https://github.com/rust-lang/rust/pull/37456
4594 [37527]: https://github.com/rust-lang/rust/pull/37527
4595 [37602]: https://github.com/rust-lang/rust/pull/37602
4596 [37613]: https://github.com/rust-lang/rust/pull/37613
4597 [37615]: https://github.com/rust-lang/rust/pull/37615
4598 [37636]: https://github.com/rust-lang/rust/pull/37636
4599 [37627]: https://github.com/rust-lang/rust/pull/37627
4600 [37642]: https://github.com/rust-lang/rust/pull/37642
4601 [37677]: https://github.com/rust-lang/rust/pull/37677
4602 [37699]: https://github.com/rust-lang/rust/pull/37699
4603 [37701]: https://github.com/rust-lang/rust/pull/37701
4604 [37705]: https://github.com/rust-lang/rust/pull/37705
4605 [37749]: https://github.com/rust-lang/rust/pull/37749
4606 [37760]: https://github.com/rust-lang/rust/pull/37760
4607 [37763]: https://github.com/rust-lang/rust/pull/37763
4608 [37764]: https://github.com/rust-lang/rust/pull/37764
4609 [37789]: https://github.com/rust-lang/rust/pull/37789
4610 [37791]: https://github.com/rust-lang/rust/pull/37791
4611 [37814]: https://github.com/rust-lang/rust/pull/37814
4612 [37817]: https://github.com/rust-lang/rust/pull/37817
4613 [37834]: https://github.com/rust-lang/rust/pull/37834
4614 [37848]: https://github.com/rust-lang/rust/pull/37848
4615 [37855]: https://github.com/rust-lang/rust/pull/37855
4616 [37882]: https://github.com/rust-lang/rust/pull/37882
4617 [37888]: https://github.com/rust-lang/rust/pull/37888
4618 [37973]: https://github.com/rust-lang/rust/pull/37973
4619 [37979]: https://github.com/rust-lang/rust/pull/37979
4620 [38086]: https://github.com/rust-lang/rust/pull/38086
4621 [38107]: https://github.com/rust-lang/rust/pull/38107
4622 [38117]: https://github.com/rust-lang/rust/pull/38117
4623 [38134]: https://github.com/rust-lang/rust/pull/38134
4624 [38146]: https://github.com/rust-lang/rust/pull/38146
4625 [38181]: https://github.com/rust-lang/rust/pull/38181
4626 [38182]: https://github.com/rust-lang/rust/pull/38182
4627 [38185]: https://github.com/rust-lang/rust/pull/38185
4628 [38192]: https://github.com/rust-lang/rust/pull/38192
4629 [38279]: https://github.com/rust-lang/rust/pull/38279
4630 [38835]: https://github.com/rust-lang/rust/pull/38835
4631 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4632 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4633 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4634 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4635 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4636 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4637 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4638 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4639 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4640 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4641 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4642 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4643 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4644 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4645 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4646 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4647 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4648 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4649 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4650 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4651 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4652 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4653 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4654 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4655 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4656 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4657 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4658 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4659 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4660 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4661 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4662 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4663 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4664 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4665 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4666 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4667 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4668 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4671 Version 1.14.0 (2016-12-22)
4672 ===========================
4677 * [`..` matches multiple tuple fields in enum variants, structs
4678 and tuples][36843]. [RFC 1492].
4679 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4680 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4681 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4682 dereferencing][36822]
4687 * [Mark enums with non-zero discriminant as non-zero][37224]
4688 * [Lower-case `static mut` names are linted like other
4689 statics and consts][37162]
4690 * [Fix ICE on some macros in const integer positions
4691 (e.g. `[u8; m!()]`)][36819]
4692 * [Improve error message and snippet for "did you mean `x`"][36798]
4693 * [Add a panic-strategy field to the target specification][36794]
4694 * [Include LLVM version in `--version --verbose`][37200]
4696 Compile-time Optimizations
4697 --------------------------
4699 * [Improve macro expansion performance][37569]
4700 * [Shrink `Expr_::ExprInlineAsm`][37445]
4701 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4702 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4703 * [Avoid more allocations when compiling html5ever][37373]
4704 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4705 * [Avoid some allocations in the macro parser][37318]
4706 * [Use a faster deflate setting][37298]
4707 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4708 during interning of slices][37270]
4709 * [Optimize `write_metadata`][37267]
4710 * [Don't process obligation forest cycles when stalled][37231]
4711 * [Avoid many `CrateConfig` clones][37161]
4712 * [Optimize `Substs::super_fold_with`][37108]
4713 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4714 * [Speed up `plug_leaks`][36917]
4719 * [`println!()`, with no arguments, prints newline][36825].
4720 Previously, an empty string was required to achieve the same.
4721 * [`Wrapping` impls standard binary and unary operators, as well as
4722 the `Sum` and `Product` iterators][37356]
4723 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4725 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4726 `VecDeque` iterators][37315]
4727 * [Improve `SipHasher` performance on small values][37312]
4728 * [Add Iterator trait TrustedLen to enable better FromIterator /
4730 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4731 * [`ReadDir` implements `Debug`][37221]
4732 * [Implement `RefUnwindSafe` for atomic types][37178]
4733 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4734 * [Avoid allocations in `Decoder::read_str`][37064]
4735 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4736 * [Impl `Debug` for raw pointers to unsized data][36880]
4737 * [Don't reuse `HashMap` random seeds][37470]
4738 * [The internal memory layout of `HashMap` is more cache-friendly, for
4739 significant improvements in some operations][36692]
4740 * [`HashMap` uses less memory on 32-bit architectures][36595]
4741 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4746 * [Expose rustc cfg values to build scripts][cargo/3243]
4747 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4748 * [Fix passing --features when testing multiple packages][cargo/3280]
4749 * [Use a single profile set per workspace][cargo/3249]
4750 * [Load `replace` sections from lock files][cargo/3220]
4751 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4756 * [rustup is the recommended Rust installation method][1.14rustup]
4757 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4758 S390x. These are [tier 2] platforms and may have major defects. Follow the
4759 instructions on the website to install, or add the targets to an existing
4760 installation with `rustup target add`. The new target triples are:
4761 - `mips-unknown-linux-gnu`
4762 - `mipsel-unknown-linux-gnu`
4763 - `mips64-unknown-linux-gnuabi64`
4764 - `mips64el-unknown-linux-gnuabi64 `
4765 - `powerpc-unknown-linux-gnu`
4766 - `powerpc64-unknown-linux-gnu`
4767 - `powerpc64le-unknown-linux-gnu`
4768 - `s390x-unknown-linux-gnu `
4769 * This release includes target (std) builds for ARM Linux running MUSL
4770 libc. These are [tier 2] platforms and may have major defects. Add the
4771 following triples to an existing rustup installation with `rustup target add`:
4772 - `arm-unknown-linux-musleabi`
4773 - `arm-unknown-linux-musleabihf`
4774 - `armv7-unknown-linux-musleabihf`
4775 * This release includes [experimental support for WebAssembly][1.14wasm], via
4776 the `wasm32-unknown-emscripten` target. This target is known to have major
4777 defects. Please test, report, and fix.
4778 * rustup no longer installs documentation by default. Run `rustup
4779 component add rust-docs` to install.
4780 * [Fix line stepping in debugger][37310]
4781 * [Enable line number debuginfo in releases][37280]
4786 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4787 * [Add support for Fuchsia OS][37313]
4788 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4793 * [A number of forward-compatibility lints used by the compiler
4794 to gradually introduce language changes have been converted
4795 to deny by default][36894]:
4796 - ["use of inaccessible extern crate erroneously allowed"][36886]
4797 - ["type parameter default erroneously allowed in invalid location"][36887]
4798 - ["detects super or self keywords at the beginning of global path"][36888]
4799 - ["two overlapping inherent impls define an item with the same name
4800 were erroneously allowed"][36889]
4801 - ["floating-point constants cannot be used in patterns"][36890]
4802 - ["constants of struct or enum type can only be used in a pattern if
4803 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4804 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4805 * [Prohibit patterns in trait methods without bodies][37378]
4806 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4807 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4808 * [The `$crate` macro variable is accepted in fewer locations][37213]
4809 * [Impls specifying extra region requirements beyond the trait
4810 they implement are rejected][37167]
4811 * [Enums may not be unsized][37111]. Unsized enums are intended to
4812 work but never have. For now they are forbidden.
4813 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4815 [tier 2]: https://forge.rust-lang.org/platform-support.html
4816 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4817 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4818 [36430]: https://github.com/rust-lang/rust/pull/36430
4819 [36595]: https://github.com/rust-lang/rust/pull/36595
4820 [36595]: https://github.com/rust-lang/rust/pull/36595
4821 [36692]: https://github.com/rust-lang/rust/pull/36692
4822 [36767]: https://github.com/rust-lang/rust/pull/36767
4823 [36794]: https://github.com/rust-lang/rust/pull/36794
4824 [36798]: https://github.com/rust-lang/rust/pull/36798
4825 [36819]: https://github.com/rust-lang/rust/pull/36819
4826 [36822]: https://github.com/rust-lang/rust/pull/36822
4827 [36825]: https://github.com/rust-lang/rust/pull/36825
4828 [36843]: https://github.com/rust-lang/rust/pull/36843
4829 [36880]: https://github.com/rust-lang/rust/pull/36880
4830 [36886]: https://github.com/rust-lang/rust/issues/36886
4831 [36887]: https://github.com/rust-lang/rust/issues/36887
4832 [36888]: https://github.com/rust-lang/rust/issues/36888
4833 [36889]: https://github.com/rust-lang/rust/issues/36889
4834 [36890]: https://github.com/rust-lang/rust/issues/36890
4835 [36891]: https://github.com/rust-lang/rust/issues/36891
4836 [36892]: https://github.com/rust-lang/rust/issues/36892
4837 [36894]: https://github.com/rust-lang/rust/pull/36894
4838 [36917]: https://github.com/rust-lang/rust/pull/36917
4839 [36993]: https://github.com/rust-lang/rust/pull/36993
4840 [37037]: https://github.com/rust-lang/rust/pull/37037
4841 [37064]: https://github.com/rust-lang/rust/pull/37064
4842 [37094]: https://github.com/rust-lang/rust/pull/37094
4843 [37108]: https://github.com/rust-lang/rust/pull/37108
4844 [37111]: https://github.com/rust-lang/rust/pull/37111
4845 [37161]: https://github.com/rust-lang/rust/pull/37161
4846 [37162]: https://github.com/rust-lang/rust/pull/37162
4847 [37167]: https://github.com/rust-lang/rust/pull/37167
4848 [37178]: https://github.com/rust-lang/rust/pull/37178
4849 [37200]: https://github.com/rust-lang/rust/pull/37200
4850 [37213]: https://github.com/rust-lang/rust/pull/37213
4851 [37221]: https://github.com/rust-lang/rust/pull/37221
4852 [37224]: https://github.com/rust-lang/rust/pull/37224
4853 [37230]: https://github.com/rust-lang/rust/pull/37230
4854 [37231]: https://github.com/rust-lang/rust/pull/37231
4855 [37247]: https://github.com/rust-lang/rust/pull/37247
4856 [37267]: https://github.com/rust-lang/rust/pull/37267
4857 [37270]: https://github.com/rust-lang/rust/pull/37270
4858 [37273]: https://github.com/rust-lang/rust/pull/37273
4859 [37280]: https://github.com/rust-lang/rust/pull/37280
4860 [37298]: https://github.com/rust-lang/rust/pull/37298
4861 [37306]: https://github.com/rust-lang/rust/pull/37306
4862 [37310]: https://github.com/rust-lang/rust/pull/37310
4863 [37312]: https://github.com/rust-lang/rust/pull/37312
4864 [37313]: https://github.com/rust-lang/rust/pull/37313
4865 [37315]: https://github.com/rust-lang/rust/pull/37315
4866 [37318]: https://github.com/rust-lang/rust/pull/37318
4867 [37322]: https://github.com/rust-lang/rust/pull/37322
4868 [37326]: https://github.com/rust-lang/rust/pull/37326
4869 [37351]: https://github.com/rust-lang/rust/pull/37351
4870 [37356]: https://github.com/rust-lang/rust/pull/37356
4871 [37367]: https://github.com/rust-lang/rust/pull/37367
4872 [37373]: https://github.com/rust-lang/rust/pull/37373
4873 [37378]: https://github.com/rust-lang/rust/pull/37378
4874 [37389]: https://github.com/rust-lang/rust/pull/37389
4875 [37392]: https://github.com/rust-lang/rust/pull/37392
4876 [37427]: https://github.com/rust-lang/rust/pull/37427
4877 [37439]: https://github.com/rust-lang/rust/pull/37439
4878 [37445]: https://github.com/rust-lang/rust/pull/37445
4879 [37470]: https://github.com/rust-lang/rust/pull/37470
4880 [37569]: https://github.com/rust-lang/rust/pull/37569
4881 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4882 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4883 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4884 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4885 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4886 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4887 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4890 Version 1.13.0 (2016-11-10)
4891 ===========================
4896 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4897 errors, like the `try!` macro, described in [RFC 0243].
4898 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4899 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4900 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4901 * [Fix lifetime rules for 'if' conditions][36029]
4902 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4907 * [Add the `-C link-arg` argument][36574]
4908 * [Remove the old AST-based backend from rustc_trans][35764]
4909 * [Don't enable NEON by default on armv7 Linux][35814]
4910 * [Fix debug line number info for macro expansions][35238]
4911 * [Do not emit "class method" debuginfo for types that are not
4912 DICompositeType][36008]
4913 * [Warn about multiple conflicting #[repr] hints][34623]
4914 * [When sizing DST, don't double-count nested struct prefixes][36351]
4915 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4916 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4917 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4918 * [Expand macros without recursing to avoid stack overflows][36214]
4923 * [Replace macro backtraces with labeled local uses][35702]
4924 * [Improve error message for misplaced doc comments][33922]
4925 * [Buffer unix and lock windows to prevent message interleaving][35975]
4926 * [Update lifetime errors to specifically note temporaries][36171]
4927 * [Special case a few colors for Windows][36178]
4928 * [Suggest `use self` when such an import resolves][36289]
4929 * [Be more specific when type parameter shadows primitive type][36338]
4930 * Many minor improvements
4932 Compile-time Optimizations
4933 --------------------------
4935 * [Compute and cache HIR hashes at beginning][35854]
4936 * [Don't hash types in loan paths][36004]
4937 * [Cache projections in trans][35761]
4938 * [Optimize the parser's last token handling][36527]
4939 * [Only instantiate #[inline] functions in codegen units referencing
4940 them][36524]. This leads to big improvements in cases where crates export
4941 define many inline functions without using them directly.
4942 * [Lazily allocate TypedArena's first chunk][36592]
4943 * [Don't allocate during default HashSet creation][36734]
4950 * [`overflowing_abs`]
4951 * [`RefCell::try_borrow`]
4952 * [`RefCell::try_borrow_mut`]
4957 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4958 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4960 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4961 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4962 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4963 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4964 * [Use arc4rand on FreeBSD][35884]
4965 * [memrchr: Correct aligned offset computation][35969]
4966 * [Improve Demangling of Rust Symbols][36059]
4967 * [Use monotonic time in condition variables][35048]
4968 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4969 * [Implement conversion traits for `char`][35755]
4970 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4971 * [Zero first byte of CString on drop][36264]
4972 * [Inherit overflow checks for sum and product][36372]
4973 * [Add missing Eq implementations][36423]
4974 * [Implement `Debug` for `DirEntry`][36631]
4975 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4977 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4978 * [Implement more traits for `std::io::ErrorKind`][35911]
4979 * [Optimize BinaryHeap bounds checking][36072]
4980 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4981 `extend_with_element`][36355]
4982 * [Fix overflow checking in unsigned pow()][34942]
4987 * This release includes security fixes to both curl and OpenSSL.
4988 * [Fix transitive doctests when panic=abort][cargo/3021]
4989 * [Add --all-features flag to cargo][cargo/3038]
4990 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4991 * [Don't parse the home directory more than once][cargo/3078]
4992 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4993 * [Update OpenSSL to 1.0.2j][cargo/3121]
4994 * [Add license and license_file to cargo metadata output][cargo/3110]
4995 * [Make crates-io registry URL optional in config; ignore all changes to
4996 source.crates-io][cargo/3089]
4997 * [Don't download dependencies from other platforms][cargo/3123]
4998 * [Build transitive dev-dependencies when needed][cargo/3125]
4999 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5000 * [Avoid updating registry when adding existing deps][cargo/3144]
5001 * [Warn about path overrides that won't work][cargo/3136]
5002 * [Use workspaces during `cargo install`][cargo/3146]
5003 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5004 * [Add --message-format flag][cargo/3000]
5005 * [Pass target environment for rustdoc][cargo/3205]
5006 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5007 * [Update curl and curl-sys][cargo/3241]
5008 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5013 * [rustdoc: Add the `--sysroot` argument][36586]
5014 * [rustdoc: Fix a couple of issues with the search results][35655]
5015 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5016 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5017 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5022 * [Remove unmaintained style guide][35124]
5023 * [Add s390x support][36369]
5024 * [Initial work at Haiku OS support][36727]
5025 * [Add mips-uclibc targets][35734]
5026 * [Crate-ify compiler-rt into compiler-builtins][35021]
5027 * [Add rustc version info (git hash + date) to dist tarball][36213]
5028 * Many documentation improvements
5033 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5034 * [Deny (by default) transmuting from fn item types to pointer-sized
5035 types][34923]. Continuing the long transition to zero-sized fn items,
5037 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5039 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5040 * [Fix lifetime rules for 'if' conditions][36029].
5041 * [Inherit overflow checks for sum and product][36372].
5042 * [Forbid user-defined macros named "macro_rules"][36730].
5044 [33922]: https://github.com/rust-lang/rust/pull/33922
5045 [34623]: https://github.com/rust-lang/rust/pull/34623
5046 [34923]: https://github.com/rust-lang/rust/pull/34923
5047 [34942]: https://github.com/rust-lang/rust/pull/34942
5048 [34982]: https://github.com/rust-lang/rust/pull/34982
5049 [35021]: https://github.com/rust-lang/rust/pull/35021
5050 [35048]: https://github.com/rust-lang/rust/pull/35048
5051 [35074]: https://github.com/rust-lang/rust/pull/35074
5052 [35124]: https://github.com/rust-lang/rust/pull/35124
5053 [35234]: https://github.com/rust-lang/rust/pull/35234
5054 [35238]: https://github.com/rust-lang/rust/pull/35238
5055 [35354]: https://github.com/rust-lang/rust/pull/35354
5056 [35559]: https://github.com/rust-lang/rust/pull/35559
5057 [35585]: https://github.com/rust-lang/rust/pull/35585
5058 [35627]: https://github.com/rust-lang/rust/pull/35627
5059 [35655]: https://github.com/rust-lang/rust/pull/35655
5060 [35702]: https://github.com/rust-lang/rust/pull/35702
5061 [35707]: https://github.com/rust-lang/rust/pull/35707
5062 [35728]: https://github.com/rust-lang/rust/pull/35728
5063 [35734]: https://github.com/rust-lang/rust/pull/35734
5064 [35755]: https://github.com/rust-lang/rust/pull/35755
5065 [35761]: https://github.com/rust-lang/rust/pull/35761
5066 [35764]: https://github.com/rust-lang/rust/pull/35764
5067 [35814]: https://github.com/rust-lang/rust/pull/35814
5068 [35854]: https://github.com/rust-lang/rust/pull/35854
5069 [35871]: https://github.com/rust-lang/rust/pull/35871
5070 [35884]: https://github.com/rust-lang/rust/pull/35884
5071 [35911]: https://github.com/rust-lang/rust/pull/35911
5072 [35969]: https://github.com/rust-lang/rust/pull/35969
5073 [35975]: https://github.com/rust-lang/rust/pull/35975
5074 [36004]: https://github.com/rust-lang/rust/pull/36004
5075 [36008]: https://github.com/rust-lang/rust/pull/36008
5076 [36014]: https://github.com/rust-lang/rust/pull/36014
5077 [36029]: https://github.com/rust-lang/rust/pull/36029
5078 [36059]: https://github.com/rust-lang/rust/pull/36059
5079 [36072]: https://github.com/rust-lang/rust/pull/36072
5080 [36101]: https://github.com/rust-lang/rust/pull/36101
5081 [36104]: https://github.com/rust-lang/rust/pull/36104
5082 [36171]: https://github.com/rust-lang/rust/pull/36171
5083 [36173]: https://github.com/rust-lang/rust/pull/36173
5084 [36178]: https://github.com/rust-lang/rust/pull/36178
5085 [36213]: https://github.com/rust-lang/rust/pull/36213
5086 [36214]: https://github.com/rust-lang/rust/pull/36214
5087 [36264]: https://github.com/rust-lang/rust/pull/36264
5088 [36266]: https://github.com/rust-lang/rust/pull/36266
5089 [36289]: https://github.com/rust-lang/rust/pull/36289
5090 [36338]: https://github.com/rust-lang/rust/pull/36338
5091 [36351]: https://github.com/rust-lang/rust/pull/36351
5092 [36355]: https://github.com/rust-lang/rust/pull/36355
5093 [36369]: https://github.com/rust-lang/rust/pull/36369
5094 [36372]: https://github.com/rust-lang/rust/pull/36372
5095 [36423]: https://github.com/rust-lang/rust/pull/36423
5096 [36482]: https://github.com/rust-lang/rust/pull/36482
5097 [36505]: https://github.com/rust-lang/rust/pull/36505
5098 [36524]: https://github.com/rust-lang/rust/pull/36524
5099 [36527]: https://github.com/rust-lang/rust/pull/36527
5100 [36551]: https://github.com/rust-lang/rust/pull/36551
5101 [36574]: https://github.com/rust-lang/rust/pull/36574
5102 [36586]: https://github.com/rust-lang/rust/pull/36586
5103 [36592]: https://github.com/rust-lang/rust/pull/36592
5104 [36631]: https://github.com/rust-lang/rust/pull/36631
5105 [36639]: https://github.com/rust-lang/rust/pull/36639
5106 [36721]: https://github.com/rust-lang/rust/pull/36721
5107 [36727]: https://github.com/rust-lang/rust/pull/36727
5108 [36730]: https://github.com/rust-lang/rust/pull/36730
5109 [36734]: https://github.com/rust-lang/rust/pull/36734
5110 [36754]: https://github.com/rust-lang/rust/pull/36754
5111 [36995]: https://github.com/rust-lang/rust/pull/36995
5112 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5113 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5114 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5115 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5116 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5117 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5118 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5119 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5120 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5121 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5122 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5123 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5124 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5125 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5126 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5127 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5128 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5129 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5130 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5131 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5132 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5133 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5134 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5135 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5136 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5137 [rustup]: https://www.rustup.rs
5138 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5139 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5140 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5141 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5142 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5143 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5144 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5147 Version 1.12.1 (2016-10-20)
5148 ===========================
5153 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5154 * [Confusion with double negation and booleans][36856]
5155 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5156 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5157 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5158 * [Corrupted memory after updated to 1.12][36936]
5159 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5160 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5161 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5163 [36381]: https://github.com/rust-lang/rust/issues/36381
5164 [36856]: https://github.com/rust-lang/rust/issues/36856
5165 [36875]: https://github.com/rust-lang/rust/issues/36875
5166 [36924]: https://github.com/rust-lang/rust/issues/36924
5167 [36926]: https://github.com/rust-lang/rust/issues/36926
5168 [36936]: https://github.com/rust-lang/rust/issues/36936
5169 [37026]: https://github.com/rust-lang/rust/issues/37026
5170 [37112]: https://github.com/rust-lang/rust/issues/37112
5171 [37153]: https://github.com/rust-lang/rust/issues/37153
5174 Version 1.12.0 (2016-09-29)
5175 ===========================
5180 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5181 This translation pass is far simpler than the previous AST->LLVM pass, and
5182 creates opportunities to perform new optimizations directly on the MIR. It
5183 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5184 * [`rustc` presents a new, more readable error format, along with
5185 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5186 Most common editors supporting Rust have been updated to work with it. It was
5187 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5192 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5193 This translation pass is far simpler than the previous AST->LLVM pass, and
5194 creates opportunities to perform new optimizations directly on the MIR. It
5195 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5196 * [Print the Rust target name, not the LLVM target name, with
5197 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5198 * [The computation of `TypeId` is correct in some cases where it was previously
5199 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5200 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5201 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5202 `--print relocation-models`, and `--print code-models` print the available
5203 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5204 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5205 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5206 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5207 These targets produce statically-linked binaries. There are no binary release
5213 * [`rustc` presents a new, more readable error format, along with
5214 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5215 Most common editors supporting Rust have been updated to work with it. It was
5216 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5217 * [In error descriptions, references are now described in plain English,
5218 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5219 * [In error type descriptions, unknown numeric types are named `{integer}` or
5220 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5221 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5226 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5227 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5228 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5229 useful](https://github.com/rust-lang/rust/pull/34908)
5230 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5231 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5232 * [Semicolons are properly required as statement delimiters inside
5233 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5234 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5239 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5240 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5241 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5242 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5243 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5244 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5245 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5246 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5247 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5248 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5249 Both on Unix and Windows.
5250 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5251 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5252 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5253 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5254 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5255 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5256 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5257 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5262 * [The `format!` macro and friends now allow a single argument to be formatted
5263 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5264 * [The lifetime bounds on `[T]::binary_search_by` and
5265 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5266 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5267 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5268 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5269 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5270 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5271 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5272 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5273 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5274 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5275 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5276 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5277 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5278 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5279 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5280 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5281 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5282 * [`mpsc::sync_channel` `Receiver`s return any available message before
5283 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5284 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5285 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5290 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5291 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5292 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5293 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5294 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5295 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5296 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5297 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5298 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5299 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5300 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5301 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5302 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5303 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5304 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5305 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5310 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5311 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5316 * [Test binaries now support a `--test-threads` argument to specify the number
5317 of threads used to run tests, and which acts the same as the
5318 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5319 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5320 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5321 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5322 * [Rust releases now come with source packages that can be installed by rustup
5323 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5324 The resulting source code can be used by tools and IDES, located in the
5325 sysroot under `lib/rustlib/src`.
5330 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5331 * Many minor improvements to the documentation.
5332 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5337 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5338 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5339 * [When formatting strings, if "precision" is specified, the "fill",
5340 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5341 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5344 Version 1.11.0 (2016-08-18)
5345 ===========================
5350 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5351 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5352 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5353 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5358 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5359 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5360 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5361 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5362 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5363 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5364 (in libcore - previously stabilized in libstd)
5365 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5366 (in libcore - previously stabilized in libstd)
5367 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5368 (in libcore - previously stabilized in libstd)
5369 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5370 (in libcore - previously stabilized in libstd)
5371 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5372 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5373 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5374 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5379 * [The `thread_local!` macro supports multiple definitions in a single
5380 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5381 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5382 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5383 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5384 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5385 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5386 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5387 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5392 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5393 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5394 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5395 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5396 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5397 and `-vv` prints warnings for all crates.
5398 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5399 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5400 This provides room for expansion by arbitrary tools.
5401 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5402 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5403 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5404 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5405 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5406 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5407 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5412 * [Caching projections speeds up type check dramatically for some
5413 workloads](https://github.com/rust-lang/rust/pull/33816)
5414 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5415 This hasher is faster, but is believed to provide sufficient
5416 protection from collision attacks.
5417 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5422 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5423 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5424 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5425 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5426 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5431 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5432 * [When emitting debug info, rustc emits frame pointers for closures,
5433 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5434 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5435 * Many more errors have been given error codes and extended
5437 * API documentation continues to be improved, with many new examples
5442 * [rustc no longer hangs when dependencies recursively re-export
5443 submodules](https://github.com/rust-lang/rust/pull/34542)
5444 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5445 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5446 rewritten](https://github.com/rust-lang/rust/pull/33895)
5447 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5448 No targets use this yet, but it works toward AVR support.
5453 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5454 * [The new follow-set rules that place restrictions on `macro_rules!`
5455 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5456 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5457 and has been a warning since 1.10.
5458 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5459 This causes breakage in some corner cases.
5462 Version 1.10.0 (2016-07-07)
5463 ===========================
5468 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5469 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5470 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5471 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5472 * [`panic!` can be converted to a runtime abort with the
5473 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5474 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5475 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5476 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5477 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5478 Note that Cargo does not yet directly support cdylibs.
5483 * `os::windows::fs::OpenOptionsExt::access_mode`
5484 * `os::windows::fs::OpenOptionsExt::share_mode`
5485 * `os::windows::fs::OpenOptionsExt::custom_flags`
5486 * `os::windows::fs::OpenOptionsExt::attributes`
5487 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5488 * `os::unix::fs::OpenOptionsExt::custom_flags`
5489 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5490 * `Default for sync::Weak`
5491 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5492 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5493 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5494 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5495 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5496 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5497 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5498 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5499 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5500 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5501 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5502 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5503 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5504 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5505 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5506 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5507 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5508 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5509 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5510 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5511 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5512 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5513 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5514 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5515 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5516 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5517 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5518 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5519 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5520 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5521 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5522 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5523 * Read/Write/RawFd impls for `UnixStream`
5524 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5525 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5526 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5527 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5528 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5529 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5530 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5531 * RawFd impls for `UnixListener`
5532 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5533 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5534 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5535 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5536 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5537 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5538 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5539 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5540 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5541 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5542 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5543 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5544 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5545 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5546 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5547 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5548 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5549 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5550 * RawFd impls for `UnixDatagram`
5551 * `{BTree,Hash}Map::values_mut`
5552 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5557 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5558 The semantics of this minor method are subtle and probably not what
5560 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5561 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5562 will fall back to `/dev/urandom` temporarily to avoid blocking
5563 during early boot](https://github.com/rust-lang/rust/pull/33086).
5564 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5565 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5566 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5567 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5568 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5569 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5570 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5574 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5575 This controls the runtime behavior of the `panic!` macro
5576 and can be either "unwind" (the default), or "abort".
5577 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5578 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5579 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5580 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5581 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5582 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5583 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5584 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5585 By default they are retried twice, which can be customized with the
5586 `net.retry` value in `.cargo/config`.
5587 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5588 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5589 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5590 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5591 Makes it possible to install multiple crates in parallel.
5592 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5593 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5594 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5595 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5596 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5597 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5602 * [rustc memory usage was reduced by refactoring the context used for
5603 type checking](https://github.com/rust-lang/rust/pull/33425).
5604 * [Speed up creation of `HashMap`s by caching the random keys used
5605 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5606 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5607 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5608 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5609 10x faster than the previous lookup tables.
5610 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5615 * Many incremental improvements to documentation and rustdoc.
5616 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5617 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5618 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5619 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5620 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5621 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5622 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5627 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5628 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5629 * [`std` no longer prints backtraces on platforms where the running
5630 module must be loaded with `env::current_exe`, which can't be relied
5631 on](https://github.com/rust-lang/rust/pull/33554).
5632 * This release includes std binaries for the i586-unknown-linux-gnu,
5633 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5634 i586 target is for old x86 hardware without SSE2, and the armv7
5635 target is for Android running on modern ARM architectures.
5636 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5637 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5638 * [On Unix the runtime aborts by calling `libc::abort` instead of
5639 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5640 * [Rust is now bootstrapped from the previous release of Rust,
5641 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5646 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5647 * [`target_env` for Linux ARM targets is just `gnu`, not
5648 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5649 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5650 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5651 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5652 Affects how macros are parsed.
5653 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5654 * [Feature-gated attributes on macro-generated macro invocations are
5655 now rejected](https://github.com/rust-lang/rust/pull/32791).
5656 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5657 This caused some minor changes to type inference.
5660 Version 1.9.0 (2016-05-26)
5661 ==========================
5666 * The `#[deprecated]` attribute when applied to an API will generate
5667 warnings when used. The warnings may be suppressed with
5668 `#[allow(deprecated)]`. [RFC 1270].
5669 * [`fn` item types are zero sized, and each `fn` names a unique
5670 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5671 `transmute` on a `fn` type will generate a warning for a few cycles,
5672 then will be converted to an error.
5673 * [Field and method resolution understand visibility, so private
5674 fields and methods cannot prevent the proper use of public fields
5675 and methods][1.9fv].
5676 * [The parser considers unicode codepoints in the
5677 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5683 * [`std::panic::catch_unwind`] (renamed from `recover`)
5684 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5685 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5686 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5687 * [`str::is_char_boundary`]
5688 * [`<*const T>::as_ref`]
5689 * [`<*mut T>::as_ref`]
5690 * [`<*mut T>::as_mut`]
5691 * [`AsciiExt::make_ascii_uppercase`]
5692 * [`AsciiExt::make_ascii_lowercase`]
5693 * [`char::decode_utf16`]
5694 * [`char::DecodeUtf16`]
5695 * [`char::DecodeUtf16Error`]
5696 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5697 * [`BTreeSet::take`]
5698 * [`BTreeSet::replace`]
5701 * [`HashSet::replace`]
5703 * [`OsString::with_capacity`]
5704 * [`OsString::clear`]
5705 * [`OsString::capacity`]
5706 * [`OsString::reserve`]
5707 * [`OsString::reserve_exact`]
5708 * [`OsStr::is_empty`]
5710 * [`std::os::unix::thread`]
5713 * [`JoinHandleExt::as_pthread_t`]
5714 * [`JoinHandleExt::into_pthread_t`]
5715 * [`HashSet::hasher`]
5716 * [`HashMap::hasher`]
5717 * [`CommandExt::exec`]
5718 * [`File::try_clone`]
5719 * [`SocketAddr::set_ip`]
5720 * [`SocketAddr::set_port`]
5721 * [`SocketAddrV4::set_ip`]
5722 * [`SocketAddrV4::set_port`]
5723 * [`SocketAddrV6::set_ip`]
5724 * [`SocketAddrV6::set_port`]
5725 * [`SocketAddrV6::set_flowinfo`]
5726 * [`SocketAddrV6::set_scope_id`]
5727 * [`slice::copy_from_slice`]
5728 * [`ptr::read_volatile`]
5729 * [`ptr::write_volatile`]
5730 * [`OpenOptions::create_new`]
5731 * [`TcpStream::set_nodelay`]
5732 * [`TcpStream::nodelay`]
5733 * [`TcpStream::set_ttl`]
5734 * [`TcpStream::ttl`]
5735 * [`TcpStream::set_only_v6`]
5736 * [`TcpStream::only_v6`]
5737 * [`TcpStream::take_error`]
5738 * [`TcpStream::set_nonblocking`]
5739 * [`TcpListener::set_ttl`]
5740 * [`TcpListener::ttl`]
5741 * [`TcpListener::set_only_v6`]
5742 * [`TcpListener::only_v6`]
5743 * [`TcpListener::take_error`]
5744 * [`TcpListener::set_nonblocking`]
5745 * [`UdpSocket::set_broadcast`]
5746 * [`UdpSocket::broadcast`]
5747 * [`UdpSocket::set_multicast_loop_v4`]
5748 * [`UdpSocket::multicast_loop_v4`]
5749 * [`UdpSocket::set_multicast_ttl_v4`]
5750 * [`UdpSocket::multicast_ttl_v4`]
5751 * [`UdpSocket::set_multicast_loop_v6`]
5752 * [`UdpSocket::multicast_loop_v6`]
5753 * [`UdpSocket::set_multicast_ttl_v6`]
5754 * [`UdpSocket::multicast_ttl_v6`]
5755 * [`UdpSocket::set_ttl`]
5756 * [`UdpSocket::ttl`]
5757 * [`UdpSocket::set_only_v6`]
5758 * [`UdpSocket::only_v6`]
5759 * [`UdpSocket::join_multicast_v4`]
5760 * [`UdpSocket::join_multicast_v6`]
5761 * [`UdpSocket::leave_multicast_v4`]
5762 * [`UdpSocket::leave_multicast_v6`]
5763 * [`UdpSocket::take_error`]
5764 * [`UdpSocket::connect`]
5765 * [`UdpSocket::send`]
5766 * [`UdpSocket::recv`]
5767 * [`UdpSocket::set_nonblocking`]
5772 * [`std::sync::Once` is poisoned if its initialization function
5774 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5775 * [Most types implement `fmt::Debug`][1.9db].
5776 * [The default buffer size used by `BufReader` and `BufWriter` was
5777 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5778 used by other languages.
5779 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5780 `Duration` additionally implements `*=` and `/=`][1.9ta].
5781 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5782 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5783 * [`Chain` implements `BufRead`][1.9ch].
5784 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5789 * [Cargo can now run concurrently][1.9cc].
5790 * [Top-level overrides allow specific revisions of crates to be
5791 overridden through the entire crate graph][1.9ct]. This is intended
5792 to make upgrades easier for large projects, by allowing crates to be
5793 forked temporarily until they've been upgraded and republished.
5794 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5795 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5796 on the commandline][1.9cf]. `rustc` arguments can also be specified
5797 in the `build.rustflags` configuration key.
5802 * [The time complexity of comparing variables for equivalence during type
5803 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5804 to major compilation time improvement in some scenarios.
5805 * [`ToString` is specialized for `str`, giving it the same performance
5806 as `to_owned`][1.9ts].
5807 * [Spawning processes with `Command::output` no longer creates extra
5809 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5810 for C-like enums][1.9cl].
5815 * [Passing the `--quiet` flag to a test runner will produce
5816 much-abbreviated output][1.9q].
5817 * The Rust Project now publishes std binaries for the
5818 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5819 `i586-pc-windows-msvc` targets.
5824 * [`std::sync::Once` is poisoned if its initialization function
5826 * [It is illegal to define methods with the same name in overlapping
5827 inherent `impl` blocks][1.9sn].
5828 * [`fn` item types are zero sized, and each `fn` names a unique
5829 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5830 `transmute` on a `fn` type will generate a warning for a few cycles,
5831 then will be converted to an error.
5832 * [Improvements to const evaluation may trigger new errors when integer
5833 literals are out of range][1.9ce].
5836 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5837 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5838 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5839 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5840 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5841 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5842 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5843 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5844 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5845 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5846 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5847 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5848 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5849 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5850 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5851 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5852 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5853 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5854 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5855 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5856 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5857 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5858 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5859 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5860 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5861 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5862 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5863 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5864 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5865 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5866 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5867 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5868 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5869 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5870 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5871 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5872 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5873 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5874 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5875 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5876 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5877 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5878 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5879 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5880 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5881 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5882 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5883 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5884 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5885 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5886 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5887 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5888 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5889 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5890 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5891 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5892 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5893 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5894 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5895 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5896 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5897 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5898 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5899 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5900 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5901 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5902 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5903 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5904 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5905 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5906 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5907 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5908 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5909 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5910 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5911 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5912 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5913 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5914 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5915 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5916 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5917 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5918 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5919 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5920 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5921 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5922 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5923 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5924 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5925 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5926 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5927 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5928 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5929 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5930 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5931 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5932 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5933 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5934 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5935 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5936 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5937 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5938 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5939 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5940 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5941 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5942 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5943 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5944 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5945 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5948 Version 1.8.0 (2016-04-14)
5949 ==========================
5954 * Rust supports overloading of compound assignment statements like
5955 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5956 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5957 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5959 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5960 addition to the non-braced form, `struct Foo;`. [RFC 218].
5966 * [`str::encode_utf16`] (renamed from `utf16_units`)
5967 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5970 * [`ptr::drop_in_place`]
5972 * [`time::SystemTime`]
5974 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5975 * [`Instant::elapsed`]
5976 * [`SystemTime::now`]
5977 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5978 * [`SystemTime::elapsed`]
5979 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5980 * [`SystemTimeError`]
5981 * [`SystemTimeError::duration`]
5982 * Various impls for `SystemTimeError`
5984 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5985 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5986 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5987 * [The `write!` and `writeln!` macros correctly emit errors if any of
5988 their arguments can't be formatted][1.8w].
5989 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5990 * [The Unix-specific `raw` modules, which contain a number of
5991 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5992 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5993 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5994 across platforms was making it difficult to implement `std`
5995 correctly. Those that need these definitions should use the `libc`
5997 * The Unix-specific `MetadataExt` traits, including
5998 `os::unix::fs::MetadataExt`, which expose values such as inode
5999 numbers [no longer return platform-specific types][1.8r], but
6000 instead return widened integers. [RFC 1415].
6001 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6002 * [Atomic loads and stores are not volatile][1.8a].
6003 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6008 * [Inlining hash functions lead to a 3% compile-time improvement in
6009 some workloads][1.8h].
6010 * When using jemalloc, its symbols are [unprefixed so that it
6011 overrides the libc malloc implementation][1.8h]. This means that for
6012 rustc, LLVM is now using jemalloc, which results in a 6%
6013 compile-time improvement on a specific workload.
6014 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6019 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6020 i686-pc-windows-msvc is now considered a tier-1 platform.
6021 * [The `--print targets` flag prints a list of supported targets][1.8t].
6022 * [The `--print cfg` flag prints the `cfg`s defined for the current
6024 * [`rustc` can be built with an new Cargo-based build system, written
6025 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6026 build system. To enable it configure with `configure --rustbuild`.
6027 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6028 variants while also indicating the total number of missing variants
6029 if more than 3][1.8m].
6030 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6031 * The Rust Project now publishes binary releases of the standard
6032 library for a number of tier-2 targets:
6033 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6034 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6035 `x86_64-rumprun-netbsd`. These can be installed with
6036 tools such as [multirust][1.8mr].
6041 * [`cargo init` creates a new Cargo project in the current
6042 directory][1.8ci]. It is otherwise like `cargo new`.
6043 * [Cargo has configuration keys for `-v` and
6044 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6045 `[term]` section of `.cargo/config`.
6046 * [Configuration keys that evaluate to strings or integers can be set
6047 via environment variables][1.8ce]. For example the `build.jobs` key
6048 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6049 precedence over config files.
6050 * [Target-specific dependencies support Rust `cfg` syntax for
6051 describing targets][1.8cfg] so that dependencies for multiple
6052 targets can be specified together. [RFC 1361].
6053 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6054 `RUSTDOC` take precedence over the `build.target-dir`,
6055 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6056 * [The child process tree is killed on Windows when Cargo is
6058 * [The `build.target` configuration value sets the target platform,
6059 like `--target`][1.8ct].
6064 * [Unstable compiler flags have been further restricted][1.8u]. Since
6065 1.0 `-Z` flags have been considered unstable, and other flags that
6066 were considered unstable additionally required passing `-Z
6067 unstable-options` to access. Unlike unstable language and library
6068 features though, these options have been accessible on the stable
6069 release channel. Going forward, *new unstable flags will not be
6070 available on the stable release channel*, and old unstable flags
6071 will warn about their usage. In the future, all unstable flags will
6072 be unavailable on the stable release channel.
6073 * [It is no longer possible to `match` on empty enum variants using
6074 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6075 * The Unix-specific `MetadataExt` traits, including
6076 `os::unix::fs::MetadataExt`, which expose values such as inode
6077 numbers [no longer return platform-specific types][1.8r], but
6078 instead return widened integers. [RFC 1415].
6079 * [Modules sourced from the filesystem cannot appear within arbitrary
6080 blocks, but only within other modules][1.8mf].
6081 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6082 * On Unix, [stack overflow triggers a runtime abort instead of a
6084 * [`Command::spawn` and its equivalents return an error if any of
6085 its command-line arguments contain interior `NUL`s][1.8n].
6086 * [Tuple and unit enum variants from other crates are in the type
6088 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6089 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6090 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6091 instead of `foo.lib`.
6094 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6095 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6096 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6097 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6098 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6099 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6100 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6101 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6102 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6103 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6104 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6105 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6106 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6107 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6108 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6109 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6110 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6111 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6112 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6113 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6114 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6115 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6116 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6117 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6118 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6119 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6120 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6121 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6122 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6123 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6124 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6125 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6126 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6127 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6128 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6129 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6130 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6131 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6132 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6133 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6134 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6135 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6136 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6137 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6138 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6139 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6140 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6141 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6142 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6143 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6144 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6145 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6146 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6147 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6148 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6149 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6150 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6151 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6152 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6153 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6156 Version 1.7.0 (2016-03-03)
6157 ==========================
6164 * [`Path::strip_prefix`] (renamed from relative_from)
6165 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6167 * [`Ipv4Addr::is_loopback`]
6168 * [`Ipv4Addr::is_private`]
6169 * [`Ipv4Addr::is_link_local`]
6170 * [`Ipv4Addr::is_multicast`]
6171 * [`Ipv4Addr::is_broadcast`]
6172 * [`Ipv4Addr::is_documentation`]
6174 * [`Ipv6Addr::is_unspecified`]
6175 * [`Ipv6Addr::is_loopback`]
6176 * [`Ipv6Addr::is_multicast`]
6179 * [`Vec::as_mut_slice`]
6181 * [`String::as_str`]
6182 * [`String::as_mut_str`]
6184 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6186 * `<[T]>::`[`sort_by_key`]
6187 * checked, saturated, and overflowing operations
6188 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6189 * [`i32::saturating_mul`]
6190 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6191 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6192 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6193 * [`u32::saturating_mul`]
6194 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6195 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6196 * and checked, saturated, and overflowing operations for other primitive types
6198 * [`ffi::IntoStringError`]
6199 * [`CString::into_string`]
6200 * [`CString::into_bytes`]
6201 * [`CString::into_bytes_with_nul`]
6202 * `From<CString> for Vec<u8>`
6204 * [`IntoStringError::into_cstring`]
6205 * [`IntoStringError::utf8_error`]
6206 * `Error for IntoStringError`
6208 * [`std::hash::BuildHasher`]
6209 * [`BuildHasher::Hasher`]
6210 * [`BuildHasher::build_hasher`]
6211 * [`std::hash::BuildHasherDefault`]
6212 * [`HashMap::with_hasher`]
6213 * [`HashMap::with_capacity_and_hasher`]
6214 * [`HashSet::with_hasher`]
6215 * [`HashSet::with_capacity_and_hasher`]
6216 * [`std::collections::hash_map::RandomState`]
6217 * [`RandomState::new`]
6218 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6219 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6220 from bytes is faster.
6221 * [The performance of `LineWriter` (and thus `io::stdout`) was
6222 improved by using `memchr` to search for newlines][1.7m].
6223 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6224 `f64` variants were stabilized previously.
6225 * [`BTreeMap` was rewritten to use less memory and improve the performance
6226 of insertion and iteration, the latter by as much as 5x][1.7bm].
6227 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6228 covariant over their contained type][1.7bt].
6229 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6230 over their contained type][1.7ll].
6231 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6233 * [`Any` is implemented for unsized types][1.7a].
6234 * [`Hash` is implemented for `Duration`][1.7h].
6239 * [When running tests with `--test`, rustdoc will pass `--cfg`
6240 arguments to the compiler][1.7dt].
6241 * [The compiler is built with RPATH information by default][1.7rpa].
6242 This means that it will be possible to run `rustc` when installed in
6243 unusual configurations without configuring the dynamic linker search
6245 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6246 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6247 over `LD_LIBRARY_PATH`.
6252 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6253 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6254 * [The `rerun-if-changed` build script directive no longer causes the
6255 build script to incorrectly run twice in certain scenarios][1.7rr].
6260 * Soundness fixes to the interactions between associated types and
6261 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6262 code that violates the new rules. This is a significant change that
6263 is known to break existing code, so it has emitted warnings for the
6264 new error cases since 1.4 to give crate authors time to adapt. The
6265 details of what is changing are subtle; read the RFC for more.
6266 * [Several bugs in the compiler's visibility calculations were
6267 fixed][1.7v]. Since this was found to break significant amounts of
6268 code, the new errors will be emitted as warnings for several release
6269 cycles, under the `private_in_public` lint.
6270 * Defaulted type parameters were accidentally accepted in positions
6271 that were not intended. In this release, [defaulted type parameters
6272 appearing outside of type definitions will generate a
6273 warning][1.7d], which will become an error in future releases.
6274 * [Parsing "." as a float results in an error instead of 0][1.7p].
6275 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6276 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6278 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6279 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6280 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6281 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6282 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6283 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6284 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6285 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6286 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6287 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6288 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6289 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6290 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6291 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6292 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6293 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6294 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6295 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6296 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6297 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6298 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6299 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6300 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6301 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6302 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6303 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6304 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6305 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6306 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6307 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6308 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6309 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6310 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6311 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6312 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6313 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6314 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6315 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6316 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6317 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6318 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6319 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6320 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6321 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6322 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6323 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6324 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6325 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6326 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6327 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6328 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6329 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6330 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6331 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6332 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6333 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6334 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6335 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6336 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6337 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6338 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6339 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6340 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6341 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6342 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6343 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6344 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6345 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6346 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6347 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6348 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6349 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6350 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6351 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6352 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6353 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6354 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6355 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6356 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6359 Version 1.6.0 (2016-01-21)
6360 ==========================
6365 * The `#![no_std]` attribute causes a crate to not be linked to the
6366 standard library, but only the [core library][1.6co], as described
6367 in [RFC 1184]. The core library defines common types and traits but
6368 has no platform dependencies whatsoever, and is the basis for Rust
6369 software in environments that cannot support a full port of the
6370 standard library, such as operating systems. Most of the core
6371 library is now stable.
6377 [`Read::read_exact`],
6378 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6379 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6380 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6381 [`os::unix::fs::DirBuilderExt`],
6382 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6383 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6384 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6385 [`collections::hash_map::Drain`],
6386 [`collections::hash_map::HashMap::drain`],
6387 [`collections::hash_set::Drain`],
6388 [`collections::hash_set::HashSet::drain`],
6389 [`collections::binary_heap::Drain`],
6390 [`collections::binary_heap::BinaryHeap::drain`],
6391 [`Vec::extend_from_slice`] (renamed from `push_all`),
6392 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6393 [`RwLock::into_inner`],
6394 [`Iterator::min_by_key`] (renamed from `min_by`),
6395 [`Iterator::max_by_key`] (renamed from `max_by`).
6396 * The [core library][1.6co] is stable, as are most of its APIs.
6397 * [The `assert_eq!` macro supports arguments that don't implement
6398 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6400 * Several timer functions that take duration in milliseconds [are
6401 deprecated in favor of those that take `Duration`][1.6ms]. These
6402 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6403 `thread::park_timeout_ms`.
6404 * The algorithm by which `Vec` reserves additional elements was
6405 [tweaked to not allocate excessive space][1.6a] while still growing
6407 * `From` conversions are [implemented from integers to floats][1.6f]
6408 in cases where the conversion is lossless. Thus they are not
6409 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6410 or `f64`. They are also not implemented for `isize` and `usize`
6411 because the implementations would be platform-specific. `From` is
6412 also implemented from `f32` to `f64`.
6413 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6414 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6415 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6416 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6418 * Sorting slices that are already sorted [is 50% faster in some
6424 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6425 * Cargo build scripts can specify their dependencies by emitting the
6426 [`rerun-if-changed`][1.6rr] key.
6427 * crates.io will reject publication of crates with dependencies that
6428 have a wildcard version constraint. Crates with wildcard
6429 dependencies were seen to cause a variety of problems, as described
6430 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6432 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6433 release folder. A variety of artifacts that Cargo failed to clean
6434 are now correctly deleted.
6439 * The `unreachable_code` lint [warns when a function call's argument
6441 * The parser indicates [failures that may be caused by
6442 confusingly-similar Unicode characters][1.6uc]
6443 * Certain macro errors [are reported at definition time][1.6m], not
6449 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6450 environment variable when locating crates. This was a pre-cargo
6451 feature for integrating with the package manager that was
6452 accidentally never removed.
6453 * [A number of bugs were fixed in the privacy checker][1.6p] that
6454 could cause previously-accepted code to break.
6455 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6456 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6457 struct pattern syntax (`Foo(..)`) can no longer be used to match
6458 unit structs. This is a warning now, but will become an error in
6459 future releases. Patterns that share the same name as a const are
6461 * A bug was fixed that causes [rustc not to apply default type
6462 parameters][1.6xc] when resolving certain method implementations of
6463 traits defined in other crates.
6465 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6466 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6467 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6468 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6469 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6470 [1.6co]: http://doc.rust-lang.org/core/index.html
6471 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6472 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6473 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6474 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6475 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6476 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6477 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6478 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6479 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6480 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6481 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6482 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6483 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6484 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6485 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6486 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6487 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6488 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6489 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6490 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6491 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6492 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6493 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6494 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6495 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6496 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6497 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6498 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6499 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6500 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6501 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6502 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6503 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6504 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6505 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6506 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6507 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6508 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6509 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6510 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6511 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6514 Version 1.5.0 (2015-12-10)
6515 ==========================
6517 * ~700 changes, numerous bugfixes
6523 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6524 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6525 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6526 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6527 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6528 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6529 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6530 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6531 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6532 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6533 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6534 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6535 [`Path::read_link`], [`Path::symlink_metadata`],
6536 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6537 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6538 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6539 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6540 [`slice::split_first_mut`], [`slice::split_first`],
6541 [`slice::split_last_mut`], [`slice::split_last`],
6542 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6543 [`str::MatchIndices`], [`str::RMatchIndices`],
6544 [`str::match_indices`], [`str::rmatch_indices`],
6545 [`str::slice_mut_unchecked`], [`string::ParseError`].
6546 * Rust applications hosted on crates.io can be installed locally to
6547 `~/.cargo/bin` with the [`cargo install`] command. Among other
6548 things this makes it easier to augment Cargo with new subcommands:
6549 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6550 invoked as `cargo foo`.
6551 * Crates with wildcard (`*`) dependencies will [emit warnings when
6552 published][1.5w]. In 1.6 it will no longer be possible to publish
6553 crates with wildcard dependencies.
6558 * The rules determining when a particular lifetime must outlive
6559 a particular value (known as '[dropck]') have been [modified
6560 to not rely on parametricity][1.5p].
6561 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6562 and `Arc`][1.5a]. Because these smart pointer types implement
6563 `Deref`, this causes breakage in cases where the interior type
6564 contains methods of the same name.
6565 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6566 that they could drop their content. Soundness fix.
6567 * All method invocations are [properly checked][1.5wf1] for
6568 [well-formedness][1.5wf2]. Soundness fix.
6569 * Traits whose supertraits contain `Self` are [not object
6570 safe][1.5o]. Soundness fix.
6571 * Target specifications support a [`no_default_libraries`][1.5nd]
6572 setting that controls whether `-nodefaultlibs` is passed to the
6573 linker, and in turn the `is_like_windows` setting no longer affects
6574 the `-nodefaultlibs` flag.
6575 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6576 * The `#[inline]` and `#[repr]` attributes [can only appear
6577 in valid locations][1.5at].
6578 * Native libraries linked from the local crate are [passed to
6579 the linker before native libraries from upstream crates][1.5nl].
6580 * Two rarely-used attributes, `#[no_debug]` and
6581 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6582 * Negation of unsigned integers, which has been a warning for
6583 several releases, [is now behind a feature gate and will
6584 generate errors][1.5nu].
6585 * The parser accidentally accepted visibility modifiers on
6586 enum variants, a bug [which has been fixed][1.5ev].
6587 * [A bug was fixed that allowed `use` statements to import unstable
6593 * When evaluating expressions at compile-time that are not
6594 compile-time constants (const-evaluating expressions in non-const
6595 contexts), incorrect code such as overlong bitshifts and arithmetic
6596 overflow will [generate a warning instead of an error][1.5ce],
6597 delaying the error until runtime. This will allow the
6598 const-evaluator to be expanded in the future backwards-compatibly.
6599 * The `improper_ctypes` lint [no longer warns about using `isize` and
6600 `usize` in FFI][1.5ict].
6605 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6607 * `Default` is [implemented for mutable slices][1.5d].
6608 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6609 * There are now `From` conversions [between floating point
6610 types][1.5f] where the conversions are lossless.
6611 * There are now `From` conversions [between integer types][1.5i] where
6612 the conversions are lossless.
6613 * [`fs::Metadata` implements `Clone`][1.5fs].
6614 * The `parse` method [accepts a leading "+" when parsing
6616 * [`AsMut` is implemented for `Vec`][1.5am].
6617 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6618 been optimized][1.5cf] and no longer rely on the default impl.
6619 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6620 `unsafe extern "C"` function types now [implement `Clone`,
6621 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6622 `fmt::Debug` for up to 12 arguments][1.5fp].
6623 * [Dropping `Vec`s is much faster in unoptimized builds when the
6624 element types don't implement `Drop`][1.5dv].
6625 * A bug that caused in incorrect behavior when [combining `VecDeque`
6626 with zero-sized types][1.5vdz] was resolved.
6627 * [`PartialOrd` for slices is faster][1.5po].
6632 * [Crate metadata size was reduced by 20%][1.5md].
6633 * [Improvements to code generation reduced the size of libcore by 3.3
6634 MB and rustc's memory usage by 18MB][1.5m].
6635 * [Improvements to deref translation increased performance in
6636 unoptimized builds][1.5dr].
6637 * Various errors in trait resolution [are deduplicated to only be
6638 reported once][1.5te].
6639 * Rust has preliminary [support for rumprun kernels][1.5rr].
6640 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6642 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6643 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6644 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6645 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6646 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6647 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6648 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6649 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6650 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6651 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6652 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6653 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6654 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6655 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6656 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6657 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6658 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6659 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6660 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6661 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6662 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6663 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6664 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6665 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6666 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6667 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6668 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6669 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6670 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6671 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6672 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6673 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6674 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6675 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6676 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6677 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6678 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6679 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6680 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6681 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6682 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6683 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6684 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6685 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6686 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6687 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6688 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6689 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6690 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6691 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6692 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6693 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6694 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6695 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6696 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6697 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6698 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6699 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6700 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6701 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6702 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6703 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6704 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6705 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6706 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6707 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6708 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6709 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6710 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6711 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6712 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6713 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6714 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6715 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6716 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6717 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6718 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6719 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6720 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6721 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6722 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6723 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6724 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6725 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6726 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6727 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6728 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6729 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6730 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6732 Version 1.4.0 (2015-10-29)
6733 ==========================
6735 * ~1200 changes, numerous bugfixes
6740 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6741 GNU) are now supported and recommended for use.
6746 * [Several changes have been made to fix type soundness and improve
6747 the behavior of associated types][sound]. See [RFC 1214]. Although
6748 we have mostly introduced these changes as warnings this release, to
6749 become errors next release, there are still some scenarios that will
6750 see immediate breakage.
6751 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6752 line breaks in addition to `\n`][crlf].
6753 * [Loans of `'static` lifetime extend to the end of a function][stat].
6754 * [`str::parse` no longer introduces avoidable rounding error when
6755 parsing floating point numbers. Together with earlier changes to
6756 float formatting/output, "round trips" like f.to_string().parse()
6757 now preserve the value of f exactly. Additionally, leading plus
6758 signs are now accepted][fp3].
6764 * `use` statements that import multiple items [can now rename
6765 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6766 * [Binops work correctly on fat pointers][binfat].
6767 * `pub extern crate`, which does not behave as expected, [issues a
6768 warning][pec] until a better solution is found.
6773 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6774 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6775 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6776 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6777 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6778 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6779 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6780 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6781 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6782 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6783 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6784 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6785 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6786 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6787 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6788 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6789 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6790 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6792 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6793 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6794 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6795 `f64::from_str_radix`.
6796 * [Reverse-searching strings is faster with the 'two-way'
6798 * [`std::io::copy` allows `?Sized` arguments][cc].
6799 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6800 [override `count`, `nth` and `last` with an O(1)
6801 implementation][it].
6802 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6803 * [`IntoRawFd` has been added to the Unix-specific prelude,
6804 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6806 * [`Extend<String>` and `FromIterator<String` are both implemented for
6808 * [`IntoIterator` is implemented for references to `Option` and
6810 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6811 Copy`][ext] as part of [RFC 839]. This will cause type inference
6812 breakage in rare situations.
6813 * [`BinaryHeap` implements `Debug`][bh2].
6814 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6816 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6817 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6818 * [String comparison is faster][faststr].
6819 * `&mut T` where `T: std::fmt::Write` [also implements
6820 `std::fmt::Write`][mutw].
6821 * [A stable regression in `VecDeque::push_back` and other
6822 capacity-altering methods that caused panics for zero-sized types
6824 * [Function pointers implement traits for up to 12 parameters][fp2].
6829 * The compiler [no longer uses the 'morestack' feature to prevent
6830 stack overflow][mm]. Instead it uses guard pages and stack
6831 probes (though stack probes are not yet implemented on any platform
6833 * [The compiler matches traits faster when projections are involved][p].
6834 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6836 * [Cargo now displays useful information about what its doing during
6837 `cargo update`][cu].
6839 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6840 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6841 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6842 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6843 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6844 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6845 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6846 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6847 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6848 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6849 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6850 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6851 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6852 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6853 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6854 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6855 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6856 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6857 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6858 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6859 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6860 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6861 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6862 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6863 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6864 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6865 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6866 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6867 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6868 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6869 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6870 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6871 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6872 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6873 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6874 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6875 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6876 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6877 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6878 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6879 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6880 [bh2]: https://github.com/rust-lang/rust/pull/28156
6881 [binfat]: https://github.com/rust-lang/rust/pull/28270
6882 [bm]: https://github.com/rust-lang/rust/pull/28197
6883 [cc]: https://github.com/rust-lang/rust/pull/27531
6884 [crlf]: https://github.com/rust-lang/rust/pull/28034
6885 [cu]: https://github.com/rust-lang/cargo/pull/1931
6886 [d]: https://github.com/rust-lang/rust/pull/27825
6887 [dep]: https://github.com/rust-lang/rust/pull/28339
6888 [es]: https://github.com/rust-lang/rust/pull/27956
6889 [ext]: https://github.com/rust-lang/rust/pull/28094
6890 [faststr]: https://github.com/rust-lang/rust/pull/28338
6891 [ffi]: https://github.com/rust-lang/rust/pull/28779
6892 [fp]: https://github.com/rust-lang/rust/pull/28268
6893 [fp2]: https://github.com/rust-lang/rust/pull/28560
6894 [fp3]: https://github.com/rust-lang/rust/pull/27307
6895 [i]: https://github.com/rust-lang/rust/pull/27451
6896 [into2]: https://github.com/rust-lang/rust/pull/28039
6897 [it]: https://github.com/rust-lang/rust/pull/27652
6898 [mm]: https://github.com/rust-lang/rust/pull/27338
6899 [mutw]: https://github.com/rust-lang/rust/pull/28368
6900 [sound]: https://github.com/rust-lang/rust/pull/27641
6901 [p]: https://github.com/rust-lang/rust/pull/27866
6902 [pec]: https://github.com/rust-lang/rust/pull/28486
6903 [pr]: https://github.com/rust-lang/rust/pull/27896
6904 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6905 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6906 [s]: https://github.com/rust-lang/rust/pull/27474
6907 [stab]: https://github.com/rust-lang/rust/pull/28339
6908 [stat]: https://github.com/rust-lang/rust/pull/28321
6909 [vd]: https://github.com/rust-lang/rust/pull/28494
6911 Version 1.3.0 (2015-09-17)
6912 ==============================
6914 * ~900 changes, numerous bugfixes
6919 * The [new object lifetime defaults][nold] have been [turned
6920 on][nold2] after a cycle of warnings about the change. Now types
6921 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6922 being interpreted as `&'a Box<Trait+'a>` to `&'a
6923 Box<Trait+'static>`.
6924 * [The Rustonomicon][nom] is a new book in the official documentation
6925 that dives into writing unsafe Rust.
6926 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6927 timekeeping is employed by other std APIs, as well as out-of-tree
6933 * The [new object lifetime defaults][nold] have been [turned
6934 on][nold2] after a cycle of warnings about the change.
6935 * There is a known [regression][lr] in how object lifetime elision is
6936 interpreted, the proper solution for which is undetermined.
6937 * The `#[prelude_import]` attribute, an internal implementation
6938 detail, was accidentally stabilized previously. [It has been put
6939 behind the `prelude_import` feature gate][pi]. This change is
6940 believed to break no existing code.
6941 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6942 [more sane for dynamically sized types][dst3]. Code that relied on
6943 the previous behavior is thought to be broken.
6944 * The `dropck` rules, which checks that destructors can't access
6945 destroyed values, [have been updated][dropck] to match the
6946 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6947 cause some previously-compiling code to no longer build.
6952 * The [new object lifetime defaults][nold] have been [turned
6953 on][nold2] after a cycle of warnings about the change.
6954 * Semicolons may [now follow types and paths in
6955 macros](https://github.com/rust-lang/rust/pull/27000).
6956 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6957 [more sane for dynamically sized types][dst3]. Code that relied on
6958 the previous behavior is not known to exist, and suspected to be
6960 * `'static` variables [may now be recursive][st].
6961 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6962 implementations correctly.
6963 * The `dropck` rules, which checks that destructors can't access
6964 destroyed values, [have been updated][dropck] to match the
6970 * The [`Duration`] API, [has been stabilized][ds], as well as the
6971 `std::time` module, which presently contains only `Duration`.
6972 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6973 * The owned C string, [`CString`], implements [`Borrow`] and the
6974 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6975 these allow C strings to be borrowed and cloned in generic code.
6976 * [`CStr`] implements [`Debug`].
6977 * [`AtomicPtr`] implements [`Debug`].
6978 * [`Error`] trait objects [can be downcast to their concrete types][e]
6979 in many common configurations, using the [`is`], [`downcast`],
6980 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6982 * Searching for substrings now [employs the two-way algorithm][search]
6983 instead of doing a naive search. This gives major speedups to a
6984 number of methods, including [`contains`][sc], [`find`][sf],
6985 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6986 [`ends_with`][sew] are also faster.
6987 * The performance of `PartialEq` for slices is [much faster][ps].
6988 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6989 is overridden and optimized by the implementations for scalars.
6990 * The [`Hasher`] trait now has a number of specialized `write_*`
6991 methods for primitive types, for efficiency.
6992 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6993 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6994 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6995 of [`std::error::Error::cause`][iec] also delegates to the inner
6997 * [`process::Child`][pc] gained the [`id`] method, which returns a
6998 `u32` representing the platform-specific process identifier.
6999 * The [`connect`] method on slices is deprecated, replaced by the new
7000 [`join`] method (note that both of these are on the *unstable*
7001 [`SliceConcatExt`] trait, but through the magic of the prelude are
7002 available to stable code anyway).
7003 * The [`Div`] operator is implemented for [`Wrapping`] types.
7004 * [`DerefMut` is implemented for `String`][dms].
7005 * Performance of SipHash (the default hasher for `HashMap`) is
7006 [better for long data][sh].
7007 * [`AtomicPtr`] implements [`Send`].
7008 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7009 are now [specialized to use uninitialized buffers for increased
7011 * Lifetime parameters of foreign functions [are now resolved
7017 * Rust can now, with some coercion, [produce programs that run on
7018 Windows XP][xp], though XP is not considered a supported platform.
7019 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7020 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7021 recommended for use in 1.3, though should be fully-functional
7022 in the [64-bit 1.4 beta][b14].
7023 * On Fedora-based systems installation will [properly configure the
7024 dynamic linker][fl].
7025 * The compiler gained many new extended error descriptions, which can
7026 be accessed with the `--explain` flag.
7027 * The `dropck` pass, which checks that destructors can't access
7028 destroyed values, [has been rewritten][dropck]. This fixes some
7029 soundness holes, and as such will cause some previously-compiling
7030 code to no longer build.
7031 * `rustc` now uses [LLVM to write archive files where possible][ar].
7032 Eventually this will eliminate the compiler's dependency on the ar
7034 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7035 supported FreeBSD on x86_64).
7036 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7037 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7039 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7040 will kill the process instead of leaking][nlp].
7042 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7043 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7044 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7045 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7046 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7047 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7048 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7049 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7050 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7051 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7052 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7053 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7054 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7055 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7056 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7057 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7058 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7059 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7060 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7061 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7062 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7063 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7064 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7065 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7066 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7067 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7068 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7069 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7070 [ar]: https://github.com/rust-lang/rust/pull/26926
7071 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7072 [dms]: https://github.com/rust-lang/rust/pull/26241
7073 [dropck]: https://github.com/rust-lang/rust/pull/27261
7074 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7075 [ds]: https://github.com/rust-lang/rust/pull/26818
7076 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7077 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7078 [dst3]: https://github.com/rust-lang/rust/pull/27351
7079 [e]: https://github.com/rust-lang/rust/pull/24793
7080 [f]: https://github.com/rust-lang/rust/pull/26588
7081 [fb]: https://github.com/rust-lang/rust/pull/26959
7082 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7083 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7084 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7085 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7086 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7087 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7088 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7089 [lic]: https://github.com/rust-lang/rust/pull/26583
7090 [lnu]: https://github.com/rust-lang/rust/pull/27026
7091 [lr]: https://github.com/rust-lang/rust/issues/27248
7092 [lum]: https://github.com/rust-lang/rust/pull/26378
7093 [lur]: https://github.com/rust-lang/rust/pull/26783
7094 [nlp]: https://github.com/rust-lang/rust/pull/27176
7095 [nold2]: https://github.com/rust-lang/rust/pull/27045
7096 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7097 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7098 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7099 [pi]: https://github.com/rust-lang/rust/pull/26699
7100 [ps]: https://github.com/rust-lang/rust/pull/26884
7101 [rte]: https://github.com/rust-lang/rust/pull/26950
7102 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7103 [search]: https://github.com/rust-lang/rust/pull/26327
7104 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7105 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7106 [sh]: https://github.com/rust-lang/rust/pull/27280
7107 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7108 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7109 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7110 [st]: https://github.com/rust-lang/rust/pull/26630
7111 [win1]: https://github.com/rust-lang/rust/pull/26569
7112 [win2]: https://github.com/rust-lang/rust/pull/26741
7113 [win3]: https://github.com/rust-lang/rust/pull/26741
7114 [win4]: https://github.com/rust-lang/rust/pull/27210
7115 [xp]: https://github.com/rust-lang/rust/pull/26569
7117 Version 1.2.0 (2015-08-07)
7118 ==========================
7120 * ~1200 changes, numerous bugfixes
7125 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7126 like `Rc` to contain types without a fixed size, arrays and trait
7127 objects, finally enabling use of `Rc<[T]>` and completing the
7128 implementation of DST.
7129 * [Parallel codegen][parcodegen] is now working again, which can
7130 substantially speed up large builds in debug mode; It also gets
7131 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7132 jobs). It's not enabled by default, but will be "in the near
7133 future". It can be activated with the `-C codegen-units=N` flag to
7135 * This is the first release with [experimental support for linking
7136 with the MSVC linker and lib C on Windows (instead of using the GNU
7137 variants via MinGW)][win]. It is yet recommended only for the most
7138 intrepid Rustaceans.
7139 * Benchmark compilations are showing a 30% improvement in
7140 bootstrapping over 1.1.
7145 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7146 unicode case mapping, which is a previously-planned change in
7147 behavior and considered a bugfix.
7148 * [`mem::align_of`] now specifies [the *minimum alignment* for
7149 T][align], which is usually the alignment programs are interested
7150 in, and the same value reported by clang's
7151 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7153 * [The `#[packed]` attribute is no longer silently accepted by the
7154 compiler][packed]. This attribute did nothing and code that
7155 mentioned it likely did not work as intended.
7156 * Associated type defaults are [now behind the
7157 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7158 defaults *did not work*, but could be mentioned syntactically. As
7159 such this breakage has minimal impact.
7164 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7165 matching against dereferenceable values.
7170 * The [`Extend`] trait, which grows a collection from an iterator, is
7171 implemented over iterators of references, for `String`, `Vec`,
7172 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7173 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7174 * The [`iter::once`] function returns an iterator that yields a single
7175 element, and [`iter::empty`] returns an iterator that yields no
7177 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7178 over substring matches.
7179 * [`Cell`] and [`RefCell`] both implement `Eq`.
7180 * A number of methods for wrapping arithmetic are added to the
7181 integral types, [`wrapping_div`], [`wrapping_rem`],
7182 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7183 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7184 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7185 type.. It is illegal for the default arithmetic operations in Rust
7186 to overflow; the desire to wrap must be explicit.
7187 * The `{:#?}` formatting specifier [displays the alternate,
7188 pretty-printed][debugfmt] form of the `Debug` formatter. This
7189 feature was actually introduced prior to 1.0 with little
7191 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7192 for writing data to formatted strings, similar to [`io::Write`].
7193 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7194 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7195 are used by code generators to emit implementations of [`Debug`].
7196 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7197 methods that convert case, following Unicode case mapping.
7198 * It is now easier to handle poisoned locks. The [`PoisonError`]
7199 type, returned by failing lock operations, exposes `into_inner`,
7200 `get_ref`, and `get_mut`, which all give access to the inner lock
7201 guard, and allow the poisoned lock to continue to operate. The
7202 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7203 poisoned lock without attempting to take the lock.
7204 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7205 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7206 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7207 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7209 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7215 * `rustc` employs smarter heuristics for guessing at [typos].
7216 * `rustc` emits more efficient code for [no-op conversions between
7217 unsafe pointers][nop].
7218 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7219 resulting in faster compile times and smaller code.
7221 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7222 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7223 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7224 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7225 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7226 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7227 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7228 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7229 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7230 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7231 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7232 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7233 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7234 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7235 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7236 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7237 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7238 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7239 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7240 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7241 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7242 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7243 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7244 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7245 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7246 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7247 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7248 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7249 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7250 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7251 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7252 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7253 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7254 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7255 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7256 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7257 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7258 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7259 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7260 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7261 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7262 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7263 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7264 [align]: https://github.com/rust-lang/rust/pull/25646
7265 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7266 [typos]: https://github.com/rust-lang/rust/pull/26087
7267 [nop]: https://github.com/rust-lang/rust/pull/26336
7268 [fat]: https://github.com/rust-lang/rust/pull/26411
7269 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7270 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7271 [packed]: https://github.com/rust-lang/rust/pull/25541
7272 [ad]: https://github.com/rust-lang/rust/pull/27382
7273 [win]: https://github.com/rust-lang/rust/pull/25350
7275 Version 1.1.0 (2015-06-25)
7276 =========================
7278 * ~850 changes, numerous bugfixes
7283 * The [`std::fs` module has been expanded][fs] to expand the set of
7284 functionality exposed:
7285 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7286 don't incur a syscall on some platforms.
7287 * A `symlink_metadata` function has been added.
7288 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7289 access to all underlying information.
7290 * The compiler now contains extended explanations of many errors. When an error
7291 with an explanation occurs the compiler suggests using the `--explain` flag
7292 to read the explanation. Error explanations are also [available online][err-index].
7293 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7294 well as other work, the time to bootstrap the compiler decreased by
7300 * The [`str::split_whitespace`] method splits a string on unicode
7301 whitespace boundaries.
7302 * On both Windows and Unix, new extension traits provide conversion of
7303 I/O types to and from the underlying system handles. On Unix, these
7304 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7305 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7306 `TcpListener`, and `UpdSocket`. Further implementations for
7307 `std::process` will be stabilized later.
7308 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7309 Windows, symlinks can be created with
7310 `std::os::windows::symlink_dir` and
7311 `std::os::windows::symlink_file`.
7312 * The `mpsc::Receiver` type can now be converted into an iterator with
7313 `into_iter` on the [`IntoIterator`] trait.
7314 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7315 implementation of the [`From`] trait.
7316 * The `Debug` implementation for `RangeFull` [creates output that is
7317 more consistent with other implementations][rf].
7318 * [`Debug` is implemented for `File`][file].
7319 * The `Default` implementation for `Arc` [no longer requires `Sync +
7321 * [The `Iterator` methods `count`, `nth`, and `last` have been
7322 overridden for slices to have O(1) performance instead of O(n)][si].
7323 * Incorrect handling of paths on Windows has been improved in both the
7324 compiler and the standard library.
7325 * [`AtomicPtr` gained a `Default` implementation][ap].
7326 * In accordance with Rust's policy on arithmetic overflow `abs` now
7327 [panics on overflow when debug assertions are enabled][abs].
7328 * The [`Cloned`] iterator, which was accidentally left unstable for
7329 1.0 [has been stabilized][c].
7330 * The [`Incoming`] iterator, which iterates over incoming TCP
7331 connections, and which was accidentally unnamable in 1.0, [is now
7332 properly exported][inc].
7333 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7334 `sift_up` or `sift_down` panic][bh].
7335 * The [`split_off`] method of `LinkedList` [no longer corrupts
7336 the list in certain scenarios][ll].
7341 * Type checking performance [has improved notably][sk] with
7342 [multiple improvements][pre].
7343 * The compiler [suggests code changes][ch] for more errors.
7344 * rustc and it's build system have experimental support for [building
7345 toolchains against MUSL][m] instead of glibc on Linux.
7346 * The compiler defines the `target_env` cfg value, which is used for
7347 distinguishing toolchains that are otherwise for the same
7348 platform. Presently this is set to `gnu` for common GNU Linux
7349 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7350 * The [`cargo rustc`][crc] command invokes a build with custom flags
7352 * [Android executables are always position independent][pie].
7353 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7356 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7357 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7358 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7359 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7360 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7361 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7362 [rf]: https://github.com/rust-lang/rust/pull/24491
7363 [err-index]: https://doc.rust-lang.org/error-index.html
7364 [sk]: https://github.com/rust-lang/rust/pull/24615
7365 [pre]: https://github.com/rust-lang/rust/pull/25323
7366 [file]: https://github.com/rust-lang/rust/pull/24598
7367 [ch]: https://github.com/rust-lang/rust/pull/24683
7368 [arc]: https://github.com/rust-lang/rust/pull/24695
7369 [si]: https://github.com/rust-lang/rust/pull/24701
7370 [ap]: https://github.com/rust-lang/rust/pull/24834
7371 [m]: https://github.com/rust-lang/rust/pull/24777
7372 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7373 [crc]: https://github.com/rust-lang/cargo/pull/1568
7374 [pie]: https://github.com/rust-lang/rust/pull/24953
7375 [abs]: https://github.com/rust-lang/rust/pull/25441
7376 [c]: https://github.com/rust-lang/rust/pull/25496
7377 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7378 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7379 [inc]: https://github.com/rust-lang/rust/pull/25522
7380 [bh]: https://github.com/rust-lang/rust/pull/25856
7381 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7382 [ll]: https://github.com/rust-lang/rust/pull/26022
7383 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7384 [drop]: https://github.com/rust-lang/rust/pull/24935
7386 Version 1.0.0 (2015-05-15)
7387 ========================
7389 * ~1500 changes, numerous bugfixes
7394 * The vast majority of the standard library is now `#[stable]`. It is
7395 no longer possible to use unstable features with a stable build of
7397 * Many popular crates on [crates.io] now work on the stable release
7399 * Arithmetic on basic integer types now [checks for overflow in debug
7405 * Several [restrictions have been added to trait coherence][coh] in
7406 order to make it easier for upstream authors to change traits
7407 without breaking downstream code.
7408 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7409 improve error messages and macro behavior. For example, `0b1234` is
7410 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7411 * Trait bounds [are always invariant][inv], eliminating the need for
7412 the `PhantomFn` and `MarkerTrait` lang items, which have been
7414 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7415 "foo" as bar` syntax has been replaced with `extern crate foo as
7416 bar`, and Cargo now automatically translates "-" in *package* names
7417 to underscore for the crate name.
7418 * [Lifetime shadowing is an error][lt].
7419 * [`Send` no longer implies `'static`][send-rfc].
7420 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7421 `MyType::default()`.
7422 * Primitive types [now have inherent methods][prim-inherent],
7423 obviating the need for extension traits like `SliceExt`.
7424 * Methods with `Self: Sized` in their `where` clause are [considered
7425 object-safe][self-sized], allowing many extension traits like
7426 `IteratorExt` to be merged into the traits they extended.
7427 * You can now [refer to associated types][assoc-where] whose
7428 corresponding trait bounds appear only in a `where` clause.
7429 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7430 like `Send` and `Sync` are now library-defined.
7431 * A [Reflect trait][reflect] was introduced, which means that
7432 downcasting via the `Any` trait is effectively limited to concrete
7433 types. This helps retain the potentially-important "parametricity"
7434 property: generic code cannot behave differently for different type
7435 arguments except in minor ways.
7436 * The `unsafe_destructor` feature is now deprecated in favor of the
7437 [new `dropck`][dropck]. This change is a major reduction in unsafe
7443 * The `thread_local` module [has been renamed to `std::thread`][th].
7444 * The methods of `IteratorExt` [have been moved to the `Iterator`
7446 * Several traits that implement Rust's conventions for type
7447 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7448 [centralized in the `std::convert` module][con].
7449 * The `FromError` trait [was removed in favor of `From`][fe].
7450 * The basic sleep function [has moved to
7451 `std::thread::sleep_ms`][slp].
7452 * The `splitn` function now takes an `n` parameter that represents the
7453 number of items yielded by the returned iterator [instead of the
7454 number of 'splits'][spl].
7455 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7456 * [Derived implementations of `PartialOrd` now order enums according
7457 to their explicitly-assigned discriminants][po].
7458 * [Methods for searching strings are generic over `Pattern`s][pat],
7459 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7461 * [In method resolution, object methods are resolved before inherent
7463 * [`String::from_str` has been deprecated in favor of the `From` impl,
7464 `String::from`][sf].
7465 * [`io::Error` implements `Sync`][ios].
7466 * [The `words` method on `&str` has been replaced with
7467 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7469 * The new path and IO modules are complete and `#[stable]`. This
7470 was the major library focus for this cycle.
7471 * The path API was [revised][path-normalize] to normalize `.`,
7472 adjusting the tradeoffs in favor of the most common usage.
7473 * A large number of remaining APIs in `std` were also stabilized
7474 during this cycle; about 75% of the non-deprecated API surface
7476 * The new [string pattern API][string-pattern] landed, which makes
7477 the string slice API much more internally consistent and flexible.
7478 * A new set of [generic conversion traits][conversion] replaced
7479 many existing ad hoc traits.
7480 * Generic numeric traits were [completely removed][num-traits]. This
7481 was made possible thanks to inherent methods for primitive types,
7482 and the removal gives maximal flexibility for designing a numeric
7483 hierarchy in the future.
7484 * The `Fn` traits are now related via [inheritance][fn-inherit]
7485 and provide ergonomic [blanket implementations][fn-blanket].
7486 * The `Index` and `IndexMut` traits were changed to
7487 [take the index by value][index-value], enabling code like
7488 `hash_map["string"]` to work.
7489 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7490 `Copy` data is known to be `Clone` as well.
7495 * Many errors now have extended explanations that can be accessed with
7496 the `--explain` flag to `rustc`.
7497 * Many new examples have been added to the standard library
7499 * rustdoc has received a number of improvements focused on completion
7501 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7502 * Much headway was made on ecosystem-wide CI, making it possible
7503 to [compare builds for breakage][ci-compare].
7506 [crates.io]: http://crates.io
7507 [clo]: https://github.com/rust-lang/rust/pull/24034
7508 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7509 [con]: https://github.com/rust-lang/rust/pull/23875
7510 [cr]: https://github.com/rust-lang/rust/pull/23419
7511 [fe]: https://github.com/rust-lang/rust/pull/23879
7512 [ie]: https://github.com/rust-lang/rust/pull/23300
7513 [inv]: https://github.com/rust-lang/rust/pull/23938
7514 [ios]: https://github.com/rust-lang/rust/pull/24133
7515 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7516 [lt]: https://github.com/rust-lang/rust/pull/24057
7517 [meth]: https://github.com/rust-lang/rust/pull/24056
7518 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7519 [po]: https://github.com/rust-lang/rust/pull/24270
7520 [sf]: https://github.com/rust-lang/rust/pull/24517
7521 [slp]: https://github.com/rust-lang/rust/pull/23949
7522 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7523 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7524 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7525 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7526 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7527 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7528 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7529 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7530 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7531 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7532 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7533 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7534 [reflect]: https://github.com/rust-lang/rust/pull/23712
7535 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7536 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7537 [index-value]: https://github.com/rust-lang/rust/pull/23601
7538 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7539 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7540 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7541 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7542 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7543 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7546 Version 1.0.0-alpha.2 (2015-02-20)
7547 =====================================
7549 * ~1300 changes, numerous bugfixes
7553 * The various I/O modules were [overhauled][io-rfc] to reduce
7554 unnecessary abstractions and provide better interoperation with
7555 the underlying platform. The old `io` module remains temporarily
7557 * The standard library now [participates in feature gating][feat],
7558 so use of unstable libraries now requires a `#![feature(...)]`
7559 attribute. The impact of this change is [described on the
7560 forum][feat-forum]. [RFC][feat-rfc].
7564 * `for` loops [now operate on the `IntoIterator` trait][into],
7565 which eliminates the need to call `.iter()`, etc. to iterate
7566 over collections. There are some new subtleties to remember
7567 though regarding what sort of iterators various types yield, in
7568 particular that `for foo in bar { }` yields values from a move
7569 iterator, destroying the original collection. [RFC][into-rfc].
7570 * Objects now have [default lifetime bounds][obj], so you don't
7571 have to write `Box<Trait+'static>` when you don't care about
7572 storing references. [RFC][obj-rfc].
7573 * In types that implement `Drop`, [lifetimes must outlive the
7574 value][drop]. This will soon make it possible to safely
7575 implement `Drop` for types where `#[unsafe_destructor]` is now
7576 required. Read the [gorgeous RFC][drop-rfc] for details.
7577 * The fully qualified <T as Trait>::X syntax lets you set the Self
7578 type for a trait method or associated type. [RFC][ufcs-rfc].
7579 * References to types that implement `Deref<U>` now [automatically
7580 coerce to references][deref] to the dereferenced type `U`,
7581 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7582 should eliminate many unsightly uses of `&*`, as when converting
7583 from references to vectors into references to
7584 slices. [RFC][deref-rfc].
7585 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7586 `|:|`) is obsolete and closure kind is inferred from context.
7587 * [`Self` is a keyword][Self].
7591 * The `Show` and `String` formatting traits [have been
7592 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7593 their related purposes. Automatically getting a string
7594 conversion to use with `format!("{:?}", something_to_debug)` is
7595 now written `#[derive(Debug)]`.
7596 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7597 OsStr}`, provide strings in platform-specific encodings for easier
7598 interop with system APIs. [RFC][osstr-rfc].
7599 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7600 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7601 creating raw pointers.
7605 * Certain long error messages of the form 'expected foo found bar'
7606 are now [split neatly across multiple
7607 lines][multiline]. Examples in the PR.
7608 * On Unix Rust can be [uninstalled][un] by running
7609 `/usr/local/lib/rustlib/uninstall.sh`.
7610 * The `#[rustc_on_unimplemented]` attribute, requiring the
7611 'on_unimplemented' feature, lets rustc [display custom error
7612 messages when a trait is expected to be implemented for a type
7617 * Rust is tested against a [LALR grammar][lalr], which parses
7618 almost all the Rust files that rustc does.
7620 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7621 [close]: https://github.com/rust-lang/rust/pull/21843
7622 [deref]: https://github.com/rust-lang/rust/pull/21351
7623 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7624 [drop]: https://github.com/rust-lang/rust/pull/21972
7625 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7626 [feat]: https://github.com/rust-lang/rust/pull/21248
7627 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7628 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7629 [fmt]: https://github.com/rust-lang/rust/pull/21457
7630 [into]: https://github.com/rust-lang/rust/pull/20790
7631 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7632 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7633 [lalr]: https://github.com/rust-lang/rust/pull/21452
7634 [multiline]: https://github.com/rust-lang/rust/pull/19870
7635 [obj]: https://github.com/rust-lang/rust/pull/22230
7636 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7637 [onun]: https://github.com/rust-lang/rust/pull/20889
7638 [osstr]: https://github.com/rust-lang/rust/pull/21488
7639 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7640 [Self]: https://github.com/rust-lang/rust/pull/22158
7641 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7642 [un]: https://github.com/rust-lang/rust/pull/22256
7645 Version 1.0.0-alpha (2015-01-09)
7646 ==================================
7648 * ~2400 changes, numerous bugfixes
7652 * The language itself is considered feature complete for 1.0,
7653 though there will be many usability improvements and bugfixes
7654 before the final release.
7655 * Nearly 50% of the public API surface of the standard library has
7656 been declared 'stable'. Those interfaces are unlikely to change
7658 * The long-running debate over integer types has been
7659 [settled][ints]: Rust will ship with types named `isize` and
7660 `usize`, rather than `int` and `uint`, for pointer-sized
7661 integers. Guidelines will be rolled out during the alpha cycle.
7662 * Most crates that are not `std` have been moved out of the Rust
7663 distribution into the Cargo ecosystem so they can evolve
7664 separately and don't need to be stabilized as quickly, including
7665 'time', 'getopts', 'num', 'regex', and 'term'.
7666 * Documentation continues to be expanded with more API coverage, more
7667 examples, and more in-depth explanations. The guides have been
7668 consolidated into [The Rust Programming Language][trpl].
7669 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7670 * All official Rust binary installers now come with [Cargo], the
7671 Rust package manager.
7675 * Closures have been [completely redesigned][unboxed] to be
7676 implemented in terms of traits, can now be used as generic type
7677 bounds and thus monomorphized and inlined, or via an opaque
7678 pointer (boxed) as in the old system. The new system is often
7679 referred to as 'unboxed' closures.
7680 * Traits now support [associated types][assoc], allowing families
7681 of related types to be defined together and used generically in
7683 * Enum variants are [namespaced by their type names][enum].
7684 * [`where` clauses][where] provide a more versatile and attractive
7685 syntax for specifying generic bounds, though the previous syntax
7687 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7689 * Rust [no longer has a runtime][rt] of any description, and only
7690 supports OS threads, not green threads.
7691 * At long last, Rust has been overhauled for 'dynamically-sized
7692 types' ([DST]), which integrates 'fat pointers' (object types,
7693 arrays, and `str`) more deeply into the type system, making it
7695 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7696 `..j` that produce range types and which, when combined with the
7697 `Index` operator and multidispatch, leads to a convenient slice
7699 * The new range syntax revealed an ambiguity in the fixed-length
7700 array syntax, so now fixed length arrays [are written `[T;
7702 * The `Copy` trait is no longer implemented automatically. Unsafe
7703 pointers no longer implement `Sync` and `Send` so types
7704 containing them don't automatically either. `Sync` and `Send`
7705 are now 'unsafe traits' so one can "forcibly" implement them via
7706 `unsafe impl` if a type confirms to the requirements for them
7707 even though the internals do not (e.g. structs containing unsafe
7708 pointers like `Arc`). These changes are intended to prevent some
7709 footguns and are collectively known as [opt-in built-in
7710 traits][oibit] (though `Sync` and `Send` will soon become pure
7711 library types unknown to the compiler).
7712 * Operator traits now take their operands [by value][ops], and
7713 comparison traits can use multidispatch to compare one type
7714 against multiple other types, allowing e.g. `String` to be
7715 compared with `&str`.
7716 * `if let` and `while let` are no longer feature-gated.
7717 * Rust has adopted a more [uniform syntax for escaping unicode
7718 characters][unicode].
7719 * `macro_rules!` [has been declared stable][mac]. Though it is a
7720 flawed system it is sufficiently popular that it must be usable
7721 for 1.0. Effort has gone into [future-proofing][mac-future] it
7722 in ways that will allow other macro systems to be developed in
7723 parallel, and won't otherwise impact the evolution of the
7725 * The prelude has been [pared back significantly][prelude] such
7726 that it is the minimum necessary to support the most pervasive
7727 code patterns, and through [generalized where clauses][where]
7728 many of the prelude extension traits have been consolidated.
7729 * Rust's rudimentary reflection [has been removed][refl], as it
7730 incurred too much code generation for little benefit.
7731 * [Struct variants][structvars] are no longer feature-gated.
7732 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7733 known as 'higher-ranked trait bounds', this crucially allows
7734 unboxed closures to work.
7735 * Macros invocations surrounded by parens or square brackets and
7736 not terminated by a semicolon are [parsed as
7737 expressions][macros], which makes expressions like `vec![1i32,
7738 2, 3].len()` work as expected.
7739 * Trait objects now implement their traits automatically, and
7740 traits that can be coerced to objects now must be [object
7742 * Automatically deriving traits is now done with `#[derive(...)]`
7743 not `#[deriving(...)]` for [consistency with other naming
7744 conventions][derive].
7745 * Importing the containing module or enum at the same time as
7746 items or variants they contain is [now done with `self` instead
7747 of `mod`][self], as in use `foo::{self, bar}`
7748 * Glob imports are no longer feature-gated.
7749 * The `box` operator and `box` patterns have been feature-gated
7750 pending a redesign. For now unique boxes should be allocated
7751 like other containers, with `Box::new`.
7755 * A [series][coll1] of [efforts][coll2] to establish
7756 [conventions][coll3] for collections types has resulted in API
7757 improvements throughout the standard library.
7758 * New [APIs for error handling][err] provide ergonomic interop
7759 between error types, and [new conventions][err-conv] describe
7760 more clearly the recommended error handling strategies in Rust.
7761 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7762 it is easier to discuss failure in the context of error handling
7763 without making clarifications as to whether you are referring to
7764 the 'fail' macro or failure more generally.
7765 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7766 syscall when available.
7767 * The 'serialize' crate has been renamed 'rustc-serialize' and
7768 moved out of the distribution to Cargo. Although it is widely
7769 used now, it is expected to be superseded in the near future.
7770 * The `Show` formatter, typically implemented with
7771 `#[derive(Show)]` is [now requested with the `{:?}`
7772 specifier][show] and is intended for use by all types, for uses
7773 such as `println!` debugging. The new `String` formatter must be
7774 implemented by hand, uses the `{}` specifier, and is intended
7775 for full-fidelity conversions of things that can logically be
7776 represented as strings.
7780 * [Flexible target specification][flex] allows rustc's code
7781 generation to be configured to support otherwise-unsupported
7783 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7784 respective debuggers with Rust-appropriate pretty-printing.
7785 * The Windows installation of Rust is distributed with the
7786 MinGW components currently required to link binaries on that
7791 * Nullable enum optimizations have been extended to more types so
7792 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7793 space than the inner types themselves.
7794 * Work has begun on supporting AArch64.
7796 [Cargo]: https://crates.io
7797 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7798 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7799 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7800 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7801 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7802 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7803 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7804 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7805 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7806 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7807 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7808 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7809 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7810 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7811 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7812 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7813 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7814 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7815 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7816 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7817 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7818 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7819 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7820 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7821 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7822 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7823 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7824 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7825 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7826 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7827 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7828 [trpl]: https://doc.rust-lang.org/book/index.html
7829 [rbe]: http://rustbyexample.com/
7832 Version 0.12.0 (2014-10-09)
7833 =============================
7835 * ~1900 changes, numerous bugfixes
7839 * The introductory documentation (now called The Rust Guide) has
7840 been completely rewritten, as have a number of supplementary
7842 * Rust's package manager, Cargo, continues to improve and is
7843 sometimes considered to be quite awesome.
7844 * Many API's in `std` have been reviewed and updated for
7845 consistency with the in-development Rust coding
7846 guidelines. The standard library documentation tracks
7847 stabilization progress.
7848 * Minor libraries have been moved out-of-tree to the rust-lang org
7849 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7850 be installed with Cargo.
7851 * Lifetime elision allows lifetime annotations to be left off of
7852 function declarations in many common scenarios.
7853 * Rust now works on 64-bit Windows.
7856 * Indexing can be overloaded with the `Index` and `IndexMut`
7858 * The `if let` construct takes a branch only if the `let` pattern
7859 matches, currently behind the 'if_let' feature gate.
7860 * 'where clauses', a more flexible syntax for specifying trait
7861 bounds that is more aesthetic, have been added for traits and
7862 free functions. Where clauses will in the future make it
7863 possible to constrain associated types, which would be
7864 impossible with the existing syntax.
7865 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7866 the 'slicing_syntax' feature gate, and can be overloaded with
7867 the `Slice` or `SliceMut` traits.
7868 * The syntax for matching of sub-slices has been changed to use a
7869 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7870 consistency with other uses of `..` and to future-proof
7871 potential additional uses of the syntax.
7872 * The syntax for matching inclusive ranges in patterns has changed
7873 from `0..3` to `0...4` to be consistent with the exclusive range
7875 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7876 c]`) has been put behind the 'advanced_slice_patterns' feature
7877 gate and may be removed in the future.
7878 * Components of tuples and tuple structs can be extracted using
7879 the `value.0` syntax, currently behind the `tuple_indexing`
7881 * The `#[crate_id]` attribute is no longer supported; versioning
7882 is handled by the package manager.
7883 * Renaming crate imports are now written `extern crate foo as bar`
7884 instead of `extern crate bar = foo`.
7885 * Renaming use statements are now written `use foo as bar` instead
7887 * `let` and `match` bindings and argument names in macros are now
7889 * The new, more efficient, closure types ('unboxed closures') have
7890 been added under a feature gate, 'unboxed_closures'. These will
7891 soon replace the existing closure types, once higher-ranked
7892 trait lifetimes are added to the language.
7893 * `move` has been added as a keyword, for indicating closures
7894 that capture by value.
7895 * Mutation and assignment is no longer allowed in pattern guards.
7896 * Generic structs and enums can now have trait bounds.
7897 * The `Share` trait is now called `Sync` to free up the term
7898 'shared' to refer to 'shared reference' (the default reference
7900 * Dynamically-sized types have been mostly implemented,
7901 unifying the behavior of fat-pointer types with the rest of the
7903 * As part of dynamically-sized types, the `Sized` trait has been
7904 introduced, which qualifying types implement by default, and
7905 which type parameters expect by default. To specify that a type
7906 parameter does not need to be sized, write `<Sized? T>`. Most
7907 types are `Sized`, notable exceptions being unsized arrays
7908 (`[T]`) and trait types.
7909 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7910 * Lifetime bounds can now be applied to type parameters and object
7912 * The old, reference counted GC type, `Gc<T>` which was once
7913 denoted by the `@` sigil, has finally been removed. GC will be
7914 revisited in the future.
7917 * Library documentation has been improved for a number of modules.
7918 * Bit-vectors, collections::bitv has been modernized.
7919 * The url crate is deprecated in favor of
7920 http://github.com/servo/rust-url, which can be installed with
7922 * Most I/O stream types can be cloned and subsequently closed from
7924 * A `std::time::Duration` type has been added for use in I/O
7925 methods that rely on timers, as well as in the 'time' crate's
7926 `Timespec` arithmetic.
7927 * The runtime I/O abstraction layer that enabled the green thread
7928 scheduler to do non-thread-blocking I/O has been removed, along
7929 with the libuv-based implementation employed by the green thread
7930 scheduler. This will greatly simplify the future I/O work.
7931 * `collections::btree` has been rewritten to have a more
7932 idiomatic and efficient design.
7935 * rustdoc output now indicates the stability levels of API's.
7936 * The `--crate-name` flag can specify the name of the crate
7937 being compiled, like `#[crate_name]`.
7938 * The `-C metadata` specifies additional metadata to hash into
7939 symbol names, and `-C extra-filename` specifies additional
7940 information to put into the output filename, for use by the
7941 package manager for versioning.
7942 * debug info generation has continued to improve and should be
7943 more reliable under both gdb and lldb.
7944 * rustc has experimental support for compiling in parallel
7945 using the `-C codegen-units` flag.
7946 * rustc no longer encodes rpath information into binaries by
7950 * Stack usage has been optimized with LLVM lifetime annotations.
7951 * Official Rust binaries on Linux are more compatible with older
7952 kernels and distributions, built on CentOS 5.10.
7955 Version 0.11.0 (2014-07-02)
7956 ==========================
7958 * ~1700 changes, numerous bugfixes
7961 * ~[T] has been removed from the language. This type is superseded by
7963 * ~str has been removed from the language. This type is superseded by
7965 * ~T has been removed from the language. This type is superseded by the
7967 * @T has been removed from the language. This type is superseded by the
7968 standard library's std::gc::Gc<T> type.
7969 * Struct fields are now all private by default.
7970 * Vector indices and shift amounts are both required to be a `uint`
7971 instead of any integral type.
7972 * Byte character, byte string, and raw byte string literals are now all
7973 supported by prefixing the normal literal with a `b`.
7974 * Multiple ABIs are no longer allowed in an ABI string
7975 * The syntax for lifetimes on closures/procedures has been tweaked
7976 slightly: `<'a>|A, B|: 'b + K -> T`
7977 * Floating point modulus has been removed from the language; however it
7978 is still provided by a library implementation.
7979 * Private enum variants are now disallowed.
7980 * The `priv` keyword has been removed from the language.
7981 * A closure can no longer be invoked through a &-pointer.
7982 * The `use foo, bar, baz;` syntax has been removed from the language.
7983 * The transmute intrinsic no longer works on type parameters.
7984 * Statics now allow blocks/items in their definition.
7985 * Trait bounds are separated from objects with + instead of : now.
7986 * Objects can no longer be read while they are mutably borrowed.
7987 * The address of a static is now marked as insignificant unless the
7988 #[inline(never)] attribute is placed it.
7989 * The #[unsafe_destructor] attribute is now behind a feature gate.
7990 * Struct literals are no longer allowed in ambiguous positions such as
7991 if, while, match, and for..in.
7992 * Declaration of lang items and intrinsics are now feature-gated by
7994 * Integral literals no longer default to `int`, and floating point
7995 literals no longer default to `f64`. Literals must be suffixed with an
7996 appropriate type if inference cannot determine the type of the
7998 * The Box<T> type is no longer implicitly borrowed to &mut T.
7999 * Procedures are now required to not capture borrowed references.
8002 * The standard library is now a "facade" over a number of underlying
8003 libraries. This means that development on the standard library should
8004 be speedier due to smaller crates, as well as a clearer line between
8006 * A new library, libcore, lives under the standard library's facade
8007 which is Rust's "0-assumption" library, suitable for embedded and
8008 kernel development for example.
8009 * A regex crate has been added to the standard distribution. This crate
8010 includes statically compiled regular expressions.
8011 * The unwrap/unwrap_err methods on Result require a Show bound for
8012 better error messages.
8013 * The return types of the std::comm primitives have been centralized
8014 around the Result type.
8015 * A number of I/O primitives have gained the ability to time out their
8017 * A number of I/O primitives have gained the ability to close their
8018 reading/writing halves to cancel pending operations.
8019 * Reverse iterator methods have been removed in favor of `rev()` on
8020 their forward-iteration counterparts.
8021 * A bitflags! macro has been added to enable easy interop with C and
8022 management of bit flags.
8023 * A debug_assert! macro is now provided which is disabled when
8024 `--cfg ndebug` is passed to the compiler.
8025 * A graphviz crate has been added for creating .dot files.
8026 * The std::cast module has been migrated into std::mem.
8027 * The std::local_data api has been migrated from freestanding functions
8028 to being based on methods.
8029 * The Pod trait has been renamed to Copy.
8030 * jemalloc has been added as the default allocator for types.
8031 * The API for allocating memory has been changed to use proper alignment
8032 and sized deallocation
8033 * Connecting a TcpStream or binding a TcpListener is now based on a
8034 string address and a u16 port. This allows connecting to a hostname as
8036 * The Reader trait now contains a core method, read_at_least(), which
8037 correctly handles many repeated 0-length reads.
8038 * The process-spawning API is now centered around a builder-style
8040 * The :? printing qualifier has been moved from the standard library to
8041 an external libdebug crate.
8042 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8043 have been renamed to Eq/Ord.
8044 * The select/plural methods have been removed from format!. The escapes
8045 for { and } have also changed from \{ and \} to {{ and }},
8047 * The TaskBuilder API has been re-worked to be a true builder, and
8048 extension traits for spawning native/green tasks have been added.
8051 * All breaking changes to the language or libraries now have their
8052 commit message annotated with `[breaking-change]` to allow for easy
8053 discovery of breaking changes.
8054 * The compiler will now try to suggest how to annotate lifetimes if a
8055 lifetime-related error occurs.
8056 * Debug info continues to be improved greatly with general bug fixes and
8057 better support for situations like link time optimization (LTO).
8058 * Usage of syntax extensions when cross-compiling has been fixed.
8059 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8060 -fdata-sections and --gc-sections has been enabled by default
8061 * The compiler is now stricter about where it will load module files
8062 from when a module is declared via `mod foo;`.
8063 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8064 Syntax extensions are now discovered via a "plugin registrar" type
8065 which will be extended in the future to other various plugins.
8066 * Lints have been restructured to allow for dynamically loadable lints.
8067 * A number of rustdoc improvements:
8068 * The HTML output has been visually redesigned.
8069 * Markdown is now powered by hoedown instead of sundown.
8070 * Searching heuristics have been greatly improved.
8071 * The search index has been reduced in size by a great amount.
8072 * Cross-crate documentation via `pub use` has been greatly improved.
8073 * Primitive types are now hyperlinked and documented.
8074 * Documentation has been moved from static.rust-lang.org/doc to
8076 * A new sandbox, play.rust-lang.org, is available for running and
8077 sharing rust code examples on-line.
8078 * Unused attributes are now more robustly warned about.
8079 * The dead_code lint now warns about unused struct fields.
8080 * Cross-compiling to iOS is now supported.
8081 * Cross-compiling to mipsel is now supported.
8082 * Stability attributes are now inherited by default and no longer apply
8083 to intra-crate usage, only inter-crate usage.
8084 * Error message related to non-exhaustive match expressions have been
8088 Version 0.10 (2014-04-03)
8089 =========================
8091 * ~1500 changes, numerous bugfixes
8094 * A new RFC process is now in place for modifying the language.
8095 * Patterns with `@`-pointers have been removed from the language.
8096 * Patterns with unique vectors (`~[T]`) have been removed from the
8098 * Patterns with unique strings (`~str`) have been removed from the
8100 * `@str` has been removed from the language.
8101 * `@[T]` has been removed from the language.
8102 * `@self` has been removed from the language.
8103 * `@Trait` has been removed from the language.
8104 * Headers on `~` allocations which contain `@` boxes inside the type for
8105 reference counting have been removed.
8106 * The semantics around the lifetimes of temporary expressions have changed,
8107 see #3511 and #11585 for more information.
8108 * Cross-crate syntax extensions are now possible, but feature gated. See
8109 #11151 for more information. This includes both `macro_rules!` macros as
8110 well as syntax extensions such as `format!`.
8111 * New lint modes have been added, and older ones have been turned on to be
8113 * Unnecessary parentheses
8116 * Uppercase variables
8117 * Publicly visible private types
8118 * `#[deriving]` with raw pointers
8119 * Unsafe functions can no longer be coerced to closures.
8120 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8121 * The `#[simd]` attribute is now behind a feature gate.
8122 * Visibility is no longer allowed on `extern crate` statements, and
8123 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8124 * Trailing commas are now allowed in argument lists and tuple patterns.
8125 * The `do` keyword has been removed, it is now a reserved keyword.
8126 * Default type parameters have been implemented, but are feature gated.
8127 * Borrowed variables through captures in closures are now considered soundly.
8128 * `extern mod` is now `extern crate`
8129 * The `Freeze` trait has been removed.
8130 * The `Share` trait has been added for types that can be shared among
8132 * Labels in macros are now hygienic.
8133 * Expression/statement macro invocations can be delimited with `{}` now.
8134 * Treatment of types allowed in `static mut` locations has been tweaked.
8135 * The `*` and `.` operators are now overloadable through the `Deref` and
8137 * `~Trait` and `proc` no longer have `Send` bounds by default.
8138 * Partial type hints are now supported with the `_` type marker.
8139 * An `Unsafe` type was introduced for interior mutability. It is now
8140 considered undefined to transmute from `&T` to `&mut T` without using the
8142 * The #[linkage] attribute was implemented for extern statics/functions.
8143 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8144 * `Pod` was renamed to `Copy`.
8147 * The `libextra` library has been removed. It has now been decomposed into
8148 component libraries with smaller and more focused nuggets of
8149 functionality. The full list of libraries can be found on the
8150 documentation index page.
8151 * std: `std::condition` has been removed. All I/O errors are now propagated
8152 through the `Result` type. In order to assist with error handling, a
8153 `try!` macro for unwrapping errors with an early return and a lint for
8154 unused results has been added. See #12039 for more information.
8155 * std: The `vec` module has been renamed to `slice`.
8156 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8157 This will become the only growable vector in the future.
8158 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8159 are now found at `std::io::BufferedReader` instead of
8160 `std::io::buffered::BufferedReader`.
8161 * std: `print` and `println` are no longer in the prelude, the `print!` and
8162 `println!` macros are intended to be used instead.
8163 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8164 attempts to statically prevent cycles.
8165 * std: The standard distribution is adopting the policy of pushing failure
8166 to the user rather than failing in libraries. Many functions (such as
8167 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8168 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8169 deriving mode: `#[deriving(Show)]`.
8170 * std: `ToStr` is now implemented for all types implementing `Show`.
8171 * std: The formatting trait methods now take `&self` instead of `&T`
8172 * std: The `invert()` method on iterators has been renamed to `rev()`
8173 * std: `std::num` has seen a reduction in the genericity of its traits,
8174 consolidating functionality into a few core traits.
8175 * std: Backtraces are now printed on task failure if the environment
8176 variable `RUST_BACKTRACE` is present.
8177 * std: Naming conventions for iterators have been standardized. More details
8178 can be found on the wiki's style guide.
8179 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8180 still implement the function.
8181 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8182 * std: `assert_approx_eq!` has been removed
8183 * std: The `e` and `E` formatting specifiers for floats have been added to
8184 print them in exponential notation.
8185 * std: The `Times` trait has been removed
8186 * std: Indications of variance and opting out of builtin bounds is done
8187 through marker types in `std::kinds::marker` now
8188 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8189 `#[deriving(Hash)]` is now possible.
8190 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8191 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8192 * std: `Chan::new` is now `channel()`.
8193 * std: A new synchronous channel type has been implemented.
8194 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8195 * std: `hashmap` and `trie` have been moved to `libcollections`
8196 * std: `run` has been rolled into `io::process`
8197 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8198 * std: The equality and comparison traits have seen some reorganization.
8199 * std: `rand` has moved to `librand`.
8200 * std: `to_{lower,upper}case` has been implemented for `char`.
8201 * std: Logging has been moved to `liblog`.
8202 * collections: `HashMap` has been rewritten for higher performance and less
8204 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8205 it can be booted manually. The runtime guide has more information and
8207 * native: All I/O functionality except signals has been implemented.
8208 * green: Task spawning with `libgreen` has been optimized with stack caching
8209 and various trimming of code.
8210 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8211 * sync: The `extra::sync` module has been updated to modern rust (and moved
8212 to the `sync` library), tweaking and improving various interfaces while
8213 dropping redundant functionality.
8214 * sync: A new `Barrier` type has been added to the `sync` library.
8215 * sync: An efficient mutex for native and green tasks has been implemented.
8216 * serialize: The `base64` module has seen some improvement. It treats
8217 newlines better, has non-string error values, and has seen general
8219 * fourcc: A `fourcc!` macro was introduced
8220 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8221 hexadecimal literal.
8224 * `rustpkg` has been deprecated and removed from the main repository. Its
8225 replacement, `cargo`, is under development.
8226 * Nightly builds of rust are now available
8227 * The memory usage of rustc has been improved many times throughout this
8229 * The build process supports disabling rpath support for the rustc binary
8231 * Code generation has improved in some cases, giving more information to the
8232 LLVM optimization passes to enable more extensive optimizations.
8233 * Debuginfo compatibility with lldb on OSX has been restored.
8234 * The master branch is now gated on an android bot, making building for
8235 android much more reliable.
8236 * Output flags have been centralized into one `--emit` flag.
8237 * Crate type flags have been centralized into one `--crate-type` flag.
8238 * Codegen flags have been consolidated behind a `-C` flag.
8239 * Linking against outdated crates now has improved error messages.
8240 * Error messages with lifetimes will often suggest how to annotate the
8241 function to fix the error.
8242 * Many more types are documented in the standard library, and new guides
8244 * Many `rustdoc` improvements:
8245 * code blocks are syntax highlighted.
8246 * render standalone markdown files.
8247 * the --test flag tests all code blocks by default.
8248 * exported macros are displayed.
8249 * re-exported types have their documentation inlined at the location of the
8251 * search works across crates that have been rendered to the same output
8255 Version 0.9 (2014-01-09)
8256 ==========================
8258 * ~1800 changes, numerous bugfixes
8261 * The `float` type has been removed. Use `f32` or `f64` instead.
8262 * A new facility for enabling experimental features (feature gating) has
8263 been added, using the crate-level `#[feature(foo)]` attribute.
8264 * Managed boxes (@) are now behind a feature gate
8265 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8266 standard library's `Gc` or `Rc` types instead.
8267 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8268 * Jumping back to the top of a loop is now done with `continue` instead of
8270 * Strings can no longer be mutated through index assignment.
8271 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8272 hash delimiters, as in `r###"foo"###`.
8273 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8275 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8276 * `@fn`s have been removed.
8277 * `do` only works with procs in order to make it obvious what the cost
8279 * Single-element tuple-like structs can no longer be dereferenced to
8280 obtain the inner value. A more comprehensive solution for overloading
8281 the dereference operator will be provided in the future.
8282 * The `#[link(...)]` attribute has been replaced with
8283 `#[crate_id = "name#vers"]`.
8284 * Empty `impl`s must be terminated with empty braces and may not be
8285 terminated with a semicolon.
8286 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8287 no longer has any special meaning.
8288 * The old `fmt!` string formatting macro has been removed.
8289 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8290 `print!` and `println!`.
8291 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8292 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8293 `extern mod foo = "bar"` instead.
8294 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8295 * Macros can have attributes.
8296 * Macros can expand to items with attributes.
8297 * Macros can expand to multiple items.
8298 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8299 * Comments may be nested.
8300 * Values automatically coerce to trait objects they implement, without
8302 * Enum discriminants are no longer an entire word but as small as needed to
8303 contain all the variants. The `repr` attribute can be used to override
8304 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8305 `#[repr(C)]` to match C enums.
8306 * Non-string literals are not allowed in attributes (they never worked).
8307 * The FFI now supports variadic functions.
8308 * Octal numeric literals, as in `0o7777`.
8309 * The `concat!` syntax extension performs compile-time string concatenation.
8310 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8311 removed as Rust no longer uses segmented stacks.
8312 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8313 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8314 not `*`; ignoring remaining fields of a struct is also done with `..`,
8315 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8316 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8317 * `rustc` supports the "system" calling convention, which defaults to the
8318 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8320 * The `type_overflow` lint (default: warn) checks literals for overflow.
8321 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8322 * The `attribute_usage` lint (default: warn) warns about unknown
8324 * The `unknown_features` lint (default: warn) warns about unknown
8326 * The `dead_code` lint (default: warn) checks for dead code.
8327 * Rust libraries can be linked statically to one another
8328 * `#[link_args]` is behind the `link_args` feature gate.
8329 * Native libraries are now linked with `#[link(name = "foo")]`
8330 * Native libraries can be statically linked to a rust crate
8331 (`#[link(name = "foo", kind = "static")]`).
8332 * Native OS X frameworks are now officially supported
8333 (`#[link(name = "foo", kind = "framework")]`).
8334 * The `#[thread_local]` attribute creates thread-local (not task-local)
8335 variables. Currently behind the `thread_local` feature gate.
8336 * The `return` keyword may be used in closures.
8337 * Types that can be copied via a memcpy implement the `Pod` kind.
8338 * The `cfg` attribute can now be used on struct fields and enum variants.
8341 * std: The `option` and `result` API's have been overhauled to make them
8342 simpler, more consistent, and more composable.
8343 * std: The entire `std::io` module has been replaced with one that is
8344 more comprehensive and that properly interfaces with the underlying
8345 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8347 * std: `io::util` contains a number of useful implementations of
8348 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8349 `ZeroReader`, `TeeReader`.
8350 * std: The reference counted pointer type `extra::rc` moved into std.
8351 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8352 just a wrapper around it).
8353 * std: The `Either` type has been removed.
8354 * std: `fmt::Default` can be implemented for any type to provide default
8355 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8356 * std: The `rand` API continues to be tweaked.
8357 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8358 on failure in gdb, is now named `rust_fail`.
8359 * std: The `each_key` and `each_value` methods on `HashMap` have been
8360 replaced by the `keys` and `values` iterators.
8361 * std: Functions dealing with type size and alignment have moved from the
8362 `sys` module to the `mem` module.
8363 * std: The `path` module was written and API changed.
8364 * std: `str::from_utf8` has been changed to cast instead of allocate.
8365 * std: `starts_with` and `ends_with` methods added to vectors via the
8366 `ImmutableEqVector` trait, which is in the prelude.
8367 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8368 if the index is out of bounds.
8369 * std: Task failure no longer propagates between tasks, as the model was
8370 complex, expensive, and incompatible with thread-based tasks.
8371 * std: The `Any` type can be used for dynamic typing.
8372 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8374 * std: Methods that produce iterators generally do not have an `_iter`
8376 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8377 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8378 * std: `util::ignore` renamed to `prelude::drop`.
8379 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8381 * std: `vec::raw` has seen a lot of cleanup and API changes.
8382 * std: The standard library no longer includes any C++ code, and very
8383 minimal C, eliminating the dependency on libstdc++.
8384 * std: Runtime scheduling and I/O functionality has been factored out into
8385 extensible interfaces and is now implemented by two different crates:
8386 libnative, for native threading and I/O; and libgreen, for green threading
8387 and I/O. This paves the way for using the standard library in more limited
8388 embedded environments.
8389 * std: The `comm` module has been rewritten to be much faster, have a
8390 simpler, more consistent API, and to work for both native and green
8392 * std: All libuv dependencies have been moved into the rustuv crate.
8393 * native: New implementations of runtime scheduling on top of OS threads.
8394 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8396 * green: The green thread scheduler and message passing types are almost
8398 * extra: The `flatpipes` module had bitrotted and was removed.
8399 * extra: All crypto functions have been removed and Rust now has a policy of
8400 not reimplementing crypto in the standard library. In the future crypto
8401 will be provided by external crates with bindings to established libraries.
8402 * extra: `c_vec` has been modernized.
8403 * extra: The `sort` module has been removed. Use the `sort` method on
8407 * The `rust` and `rusti` commands have been removed, due to lack of
8409 * `rustdoc` was completely rewritten.
8410 * `rustdoc` can test code examples in documentation.
8411 * `rustpkg` can test packages with the argument, 'test'.
8412 * `rustpkg` supports arbitrary dependencies, including C libraries.
8413 * `rustc`'s support for generating debug info is improved again.
8414 * `rustc` has better error reporting for unbalanced delimiters.
8415 * `rustc`'s JIT support was removed due to bitrot.
8416 * Executables and static libraries can be built with LTO (-Z lto)
8417 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8421 Version 0.8 (2013-09-26)
8422 ============================
8424 * ~2200 changes, numerous bugfixes
8427 * The `for` loop syntax has changed to work with the `Iterator` trait.
8428 * At long last, unwinding works on Windows.
8429 * Default methods are ready for use.
8430 * Many trait inheritance bugs fixed.
8431 * Owned and borrowed trait objects work more reliably.
8432 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8433 * rustc can omit emission of code for the `debug!` macro if it is passed
8435 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8436 for foo.rs, then foo/mod.rs, and will generate an error when both are
8438 * Strings no longer contain trailing nulls. The new `std::c_str` module
8439 provides new mechanisms for converting to C strings.
8440 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8441 * The FFI has been overhauled such that foreign functions are called directly,
8442 instead of through a stack-switching wrapper.
8443 * Calling a foreign function must be done through a Rust function with the
8444 `#[fixed_stack_segment]` attribute.
8445 * The `externfn!` macro can be used to declare both a foreign function and
8446 a `#[fixed_stack_segment]` wrapper at once.
8447 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8448 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8449 * `priv` is disallowed everywhere except for struct fields and enum variants.
8450 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8451 * `ref` bindings in irrefutable patterns work correctly now.
8452 * `char` is now prevented from containing invalid code points.
8453 * Casting to `bool` is no longer allowed.
8454 * `\0` is now accepted as an escape in chars and strings.
8455 * `yield` is a reserved keyword.
8456 * `typeof` is a reserved keyword.
8457 * Crates may be imported by URL with `extern mod foo = "url";`.
8458 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8459 * Static vectors can be initialized with repeating elements,
8460 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8461 * Static structs can be initialized with functional record update,
8462 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8463 * `cfg!` can be used to conditionally execute code based on the crate
8464 configuration, similarly to `#[cfg(...)]`.
8465 * The `unnecessary_qualification` lint detects unneeded module
8466 prefixes (default: allow).
8467 * Arithmetic operations have been implemented on the SIMD types in
8468 `std::unstable::simd`.
8469 * Exchange allocation headers were removed, reducing memory usage.
8470 * `format!` implements a completely new, extensible, and higher-performance
8471 string formatting system. It will replace `fmt!`.
8472 * `print!` and `println!` write formatted strings (using the `format!`
8473 extension) to stdout.
8474 * `write!` and `writeln!` write formatted strings (using the `format!`
8475 extension) to the new Writers in `std::rt::io`.
8476 * The library section in which a function or static is placed may
8477 be specified with `#[link_section = "..."]`.
8478 * The `proto!` syntax extension for defining bounded message protocols
8480 * `macro_rules!` is hygienic for `let` declarations.
8481 * The `#[export_name]` attribute specifies the name of a symbol.
8482 * `unreachable!` can be used to indicate unreachable code, and fails
8486 * std: Transitioned to the new runtime, written in Rust.
8487 * std: Added an experimental I/O library, `rt::io`, based on the new
8489 * std: A new generic `range` function was added to the prelude, replacing
8490 `uint::range` and friends.
8491 * std: `range_rev` no longer exists. Since range is an iterator it can be
8492 reversed with `range(lo, hi).invert()`.
8493 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8494 renamed to `unwrap_or`.
8495 * std: The `iterator` module was renamed to `iter`.
8496 * std: Integral types now support the `checked_add`, `checked_sub`, and
8497 `checked_mul` operations for detecting overflow.
8498 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8500 * std: Methods are standardizing on conventions for casting methods:
8501 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8503 * std: The `CString` type in `c_str` provides new ways to convert to and
8505 * std: `DoubleEndedIterator` can yield elements in two directions.
8506 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8508 * std: `str::from_bytes` renamed to `str::from_utf8`.
8509 * std: `pop_opt` and `shift_opt` methods added to vectors.
8510 * std: The task-local data interface no longer uses @, and keys are
8511 no longer function pointers.
8512 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8513 * std: Added `SharedPort` to `comm`.
8514 * std: `Eq` has a default method for `ne`; only `eq` is required
8516 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8517 is required in implementations.
8518 * std: `is_utf8` performance is improved, impacting many string functions.
8519 * std: `os::MemoryMap` provides cross-platform mmap.
8520 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8521 are not 'in-bounds' are considered undefined.
8522 * std: Many freestanding functions in `vec` removed in favor of methods.
8523 * std: Many freestanding functions on scalar types removed in favor of
8525 * std: Many options to task builders were removed since they don't make
8526 sense in the new scheduler design.
8527 * std: More containers implement `FromIterator` so can be created by the
8529 * std: More complete atomic types in `unstable::atomics`.
8530 * std: `comm::PortSet` removed.
8531 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8532 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8533 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8534 default implementations.
8535 * std: Various `from_str` functions were removed in favor of a generic
8536 `from_str` which is available in the prelude.
8537 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8538 * extra: `dlist`, the doubly-linked list was modernized.
8539 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8540 * extra: Added `glob` module, replacing `std::os::glob`.
8541 * extra: `rope` was removed.
8542 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8543 * extra: `net`, and `timer` were removed. The experimental replacements
8544 are `std::rt::io::net` and `std::rt::io::timer`.
8545 * extra: Iterators implemented for `SmallIntMap`.
8546 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8547 * extra: `SmallIntSet` removed. Use `BitvSet`.
8548 * extra: Performance of JSON parsing greatly improved.
8549 * extra: `semver` updated to SemVer 2.0.0.
8550 * extra: `term` handles more terminals correctly.
8551 * extra: `dbg` module removed.
8552 * extra: `par` module removed.
8553 * extra: `future` was cleaned up, with some method renames.
8554 * extra: Most free functions in `getopts` were converted to methods.
8557 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8558 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8559 similarly to gcc's `--march` flag.
8560 * rustc's performance compiling small crates is much better.
8561 * rustpkg has received many improvements.
8562 * rustpkg supports git tags as package IDs.
8563 * rustpkg builds into target-specific directories so it can be used for
8565 * The number of concurrent test tasks is controlled by the environment
8566 variable RUST_TEST_TASKS.
8567 * The test harness can now report metrics for benchmarks.
8568 * All tools have man pages.
8569 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8570 * The runtime uses jemalloc for allocations.
8571 * Segmented stacks are temporarily disabled as part of the transition to
8572 the new runtime. Stack overflows are possible!
8573 * A new documentation backend, rustdoc_ng, is available for use. It is
8574 still invoked through the normal `rustdoc` command.
8577 Version 0.7 (2013-07-03)
8578 =======================
8580 * ~2000 changes, numerous bugfixes
8583 * `impl`s no longer accept a visibility qualifier. Put them on methods
8585 * The borrow checker has been rewritten with flow-sensitivity, fixing
8586 many bugs and inconveniences.
8587 * The `self` parameter no longer implicitly means `&'self self`,
8588 and can be explicitly marked with a lifetime.
8589 * Overloadable compound operators (`+=`, etc.) have been temporarily
8590 removed due to bugs.
8591 * The `for` loop protocol now requires `for`-iterators to return `bool`
8592 so they compose better.
8593 * The `Durable` trait is replaced with the `'static` bounds.
8594 * Trait default methods work more often.
8595 * Structs with the `#[packed]` attribute have byte alignment and
8596 no padding between fields.
8597 * Type parameters bound by `Copy` must now be copied explicitly with
8599 * It is now illegal to move out of a dereferenced unsafe pointer.
8600 * `Option<~T>` is now represented as a nullable pointer.
8601 * `@mut` does dynamic borrow checks correctly.
8602 * The `main` function is only detected at the topmost level of the crate.
8603 The `#[main]` attribute is still valid anywhere.
8604 * Struct fields may no longer be mutable. Use inherited mutability.
8605 * The `#[no_send]` attribute makes a type that would otherwise be
8607 * The `#[no_freeze]` attribute makes a type that would otherwise be
8609 * Unbounded recursion will abort the process after reaching the limit
8610 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8611 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8612 are never implicitly copyable.
8613 * `#[static_assert]` makes compile-time assertions about static bools.
8614 * At long last, 'argument modes' no longer exist.
8615 * The rarely used `use mod` statement no longer exists.
8618 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8620 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8621 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8623 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8624 and unsuffixed integer literals.
8627 * The `core` crate was renamed to `std`.
8628 * The `std` crate was renamed to `extra`.
8629 * More and improved documentation.
8630 * std: `iterator` module for external iterator objects.
8631 * Many old-style (internal, higher-order function) iterators replaced by
8632 implementations of `Iterator`.
8633 * std: Many old internal vector and string iterators,
8634 incl. `any`, `all`. removed.
8635 * std: The `finalize` method of `Drop` renamed to `drop`.
8636 * std: The `drop` method now takes `&mut self` instead of `&self`.
8637 * std: The prelude no longer re-exports any modules, only types and traits.
8638 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8639 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8640 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8641 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8642 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8643 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8644 * std: Many types implement `Clone`.
8645 * std: `path` type renamed to `Path`.
8646 * std: `mut` module and `Mut` type removed.
8647 * std: Many standalone functions removed in favor of methods and iterators
8648 in `vec`, `str`. In the future methods will also work as functions.
8649 * std: `reinterpret_cast` removed. Use `transmute`.
8650 * std: ascii string handling in `std::ascii`.
8651 * std: `Rand` is implemented for ~/@.
8652 * std: `run` module for spawning processes overhauled.
8653 * std: Various atomic types added to `unstable::atomic`.
8654 * std: Various types implement `Zero`.
8655 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8656 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8657 * std: Added `os::mkdir_recursive`.
8658 * std: Added `os::glob` function performs filesystems globs.
8659 * std: `FuzzyEq` renamed to `ApproxEq`.
8660 * std: `Map` now defines `pop` and `swap` methods.
8661 * std: `Cell` constructors converted to static methods.
8662 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8663 * extra: `flate` module moved from `std` to `extra`.
8664 * extra: `fileinput` module for iterating over a series of files.
8665 * extra: `Complex` number type and `complex` module.
8666 * extra: `Rational` number type and `rational` module.
8667 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8668 * extra: `term` uses terminfo now, is more correct.
8669 * extra: `arc` functions converted to methods.
8670 * extra: Implementation of fixed output size variations of SHA-2.
8673 * `unused_variables` lint mode for unused variables (default: warn).
8674 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8676 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8678 * `dead_assignment` lint mode for unread variables (default: warn).
8679 * `unnecessary_allocation` lint mode detects some heap allocations that are
8680 immediately borrowed so could be written without allocating (default: warn).
8681 * `missing_doc` lint mode (default: allow).
8682 * `unreachable_code` lint mode (default: warn).
8683 * The `rusti` command has been rewritten and a number of bugs addressed.
8684 * rustc outputs in color on more terminals.
8685 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8686 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8687 * Compiling with `-g` will make the binary record information about
8688 dynamic borrowcheck failures for debugging.
8689 * rustdoc has a nicer stylesheet.
8690 * Various improvements to rustdoc.
8691 * Improvements to rustpkg (see the detailed release notes).
8694 Version 0.6 (2013-04-03)
8695 ========================
8697 * ~2100 changes, numerous bugfixes
8700 * The self type parameter in traits is now spelled `Self`
8701 * The `self` parameter in trait and impl methods must now be explicitly
8702 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8703 * Static methods no longer require the `static` keyword and instead
8704 are distinguished by the lack of a `self` parameter
8705 * Replaced the `Durable` trait with the `'static` lifetime
8706 * The old closure type syntax with the trailing sigil has been
8707 removed in favor of the more consistent leading sigil
8708 * `super` is a keyword, and may be prefixed to paths
8709 * Trait bounds are separated with `+` instead of whitespace
8710 * Traits are implemented with `impl Trait for Type`
8711 instead of `impl Type: Trait`
8712 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8713 * The `export` keyword has finally been removed
8714 * The `move` keyword has been removed (see "Semantic changes")
8715 * The interior mutability qualifier on vectors, `[mut T]`, has been
8716 removed. Use `&mut [T]`, etc.
8717 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8718 * `fail` is no longer a keyword. Use `fail!()`
8719 * `assert` is no longer a keyword. Use `assert!()`
8720 * `log` is no longer a keyword. use `debug!`, etc.
8721 * 1-tuples may be represented as `(T,)`
8722 * Struct fields may no longer be `mut`. Use inherited mutability,
8723 `@mut T`, `core::mut` or `core::cell`
8724 * `extern mod { ... }` is no longer valid syntax for foreign
8725 function modules. Use extern blocks: `extern { ... }`
8726 * Newtype enums removed. Use tuple-structs.
8727 * Trait implementations no longer support visibility modifiers
8728 * Pattern matching over vectors improved and expanded
8729 * `const` renamed to `static` to correspond to lifetime name,
8730 and make room for future `static mut` unsafe mutable globals.
8731 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8732 * `Clone` implementations can be automatically generated with
8733 `#[deriving(Clone)]`
8734 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8735 instead of `foo as Bar`.
8736 * Fixed length vector types are now written as `[int, .. 3]`
8737 instead of `[int * 3]`.
8738 * Fixed length vector types can express the length as a constant
8739 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8742 * Types with owned pointers or custom destructors move by default,
8743 eliminating the `move` keyword
8744 * All foreign functions are considered unsafe
8745 * &mut is now unaliasable
8746 * Writes to borrowed @mut pointers are prevented dynamically
8748 * The name of the main function can be customized using #[main]
8749 * The default type of an inferred closure is &fn instead of @fn
8750 * `use` statements may no longer be "chained" - they cannot import
8751 identifiers imported by previous `use` statements
8752 * `use` statements are crate relative, importing from the "top"
8753 of the crate by default. Paths may be prefixed with `super::`
8754 or `self::` to change the search behavior.
8755 * Method visibility is inherited from the implementation declaration
8756 * Structural records have been removed
8757 * Many more types can be used in static items, including enums
8758 'static-lifetime pointers and vectors
8759 * Pattern matching over vectors improved and expanded
8760 * Typechecking of closure types has been overhauled to
8761 improve inference and eliminate unsoundness
8762 * Macros leave scope at the end of modules, unless that module is
8763 tagged with #[macro_escape]
8766 * Added big integers to `std::bigint`
8767 * Removed `core::oldcomm` module
8768 * Added pipe-based `core::comm` module
8769 * Numeric traits have been reorganized under `core::num`
8770 * `vec::slice` finally returns a slice
8771 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8772 * Containers reorganized around traits in `core::container`
8773 * `core::dvec` removed, `~[T]` is a drop-in replacement
8774 * `core::send_map` renamed to `core::hashmap`
8775 * `std::map` removed; replaced with `core::hashmap`
8776 * `std::treemap` reimplemented as an owned balanced tree
8777 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8778 * `core::trie` added as a fast ordered map for integer keys
8779 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8780 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8781 overload the comparison operators, whereas `TotalOrd` is used
8782 by certain container types
8785 * Replaced the 'cargo' package manager with 'rustpkg'
8786 * Added all-purpose 'rust' tool
8787 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8788 * rustc now *attempts* to offer spelling suggestions
8789 * Improved support for ARM and Android
8790 * Preliminary MIPS backend
8791 * Improved foreign function ABI implementation for x86, x86_64
8792 * Various memory usage improvements
8793 * Rust code may be embedded in foreign code under limited circumstances
8794 * Inline assembler supported by new asm!() syntax extension.
8797 Version 0.5 (2012-12-21)
8798 ===========================
8800 * ~900 changes, numerous bugfixes
8803 * Removed `<-` move operator
8804 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8805 * Removed old fixed length vector syntax - `[T]/N`
8806 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8807 * Macros may now expand to items and statements
8808 * `a.b()` is always parsed as a method call, never as a field projection
8809 * `Eq` and `IterBytes` implementations can be automatically generated
8810 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8811 * Removed the special crate language for `.rc` files
8812 * Function arguments may consist of any irrefutable pattern
8815 * `&` and `~` pointers may point to objects
8816 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8817 * Enum variants may be structs
8818 * Destructors can be added to all nominal types with the Drop trait
8819 * Structs and nullary enum variants may be constants
8820 * Values that cannot be implicitly copied are now automatically moved
8821 without writing `move` explicitly
8822 * `&T` may now be coerced to `*T`
8823 * Coercions happen in `let` statements as well as function calls
8824 * `use` statements now take crate-relative paths
8825 * The module and type namespaces have been merged so that static
8826 method names can be resolved under the trait in which they are
8829 * Improved support for language features
8830 * Trait inheritance works in many scenarios
8831 * More support for explicit self arguments in methods - `self`, `&self`
8832 `@self`, and `~self` all generally work as expected
8833 * Static methods work in more situations
8834 * Experimental: Traits may declare default methods for the implementations
8838 * New condition handling system in `core::condition`
8839 * Timsort added to `std::sort`
8840 * New priority queue, `std::priority_queue`
8841 * Pipes for serializable types, `std::flatpipes'
8842 * Serialization overhauled to be trait-based
8843 * Expanded `getopts` definitions
8844 * Moved futures to `std`
8845 * More functions are pure now
8846 * `core::comm` renamed to `oldcomm`. Still deprecated
8847 * `rustdoc` and `cargo` are libraries now
8850 * Added a preliminary REPL, `rusti`
8851 * License changed from MIT to dual MIT/APL2
8854 Version 0.4 (2012-10-15)
8855 ==========================
8857 * ~2000 changes, numerous bugfixes
8860 * All keywords are now strict and may not be used as identifiers anywhere
8861 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8862 'of', 'with', 'to', 'class'.
8863 * Classes are replaced with simpler structs
8864 * Explicit method self types
8865 * `ret` became `return` and `alt` became `match`
8866 * `import` is now `use`; `use is now `extern mod`
8867 * `extern mod { ... }` is now `extern { ... }`
8868 * `use mod` is the recommended way to import modules
8869 * `pub` and `priv` replace deprecated export lists
8870 * The syntax of `match` pattern arms now uses fat arrow (=>)
8871 * `main` no longer accepts an args vector; use `os::args` instead
8874 * Trait implementations are now coherent, ala Haskell typeclasses
8875 * Trait methods may be static
8876 * Argument modes are deprecated
8877 * Borrowed pointers are much more mature and recommended for use
8878 * Strings and vectors in the static region are stored in constant memory
8879 * Typestate was removed
8880 * Resolution rewritten to be more reliable
8881 * Support for 'dual-mode' data structures (freezing and thawing)
8884 * Most binary operators can now be overloaded via the traits in
8886 * `std::net::url` for representing URLs
8887 * Sendable hash maps in `core::send_map`
8888 * `core::task' gained a (currently unsafe) task-local storage API
8891 * An efficient new intertask communication primitive called the pipe,
8892 along with a number of higher-level channel types, in `core::pipes`
8893 * `std::arc`, an atomically reference counted, immutable, shared memory
8895 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8896 * Futures are now based on pipes and sendable
8897 * More robust linked task failure
8898 * Improved task builder API
8901 * Improved error reporting
8902 * Preliminary JIT support
8903 * Preliminary work on precise GC
8904 * Extensive architectural improvements to rustc
8905 * Begun a transition away from buggy C++-based reflection (shape) code to
8906 Rust-based (visitor) code
8907 * All hash functions and tables converted to secure, randomized SipHash
8910 Version 0.3 (2012-07-12)
8911 ========================
8913 * ~1900 changes, numerous bugfixes
8915 * New coding conveniences
8916 * Integer-literal suffix inference
8917 * Per-item control over warnings, errors
8918 * #[cfg(windows)] and #[cfg(unix)] attributes
8919 * Documentation comments
8920 * More compact closure syntax
8921 * 'do' expressions for treating higher-order functions as
8923 * *-patterns (wildcard extended to all constructor fields)
8926 * Name resolution pass and exhaustiveness checker rewritten
8927 * Region pointers and borrow checking supersede alias
8929 * Init-ness checking is now provided by a region-based liveness
8930 pass instead of the typestate pass; same for last-use analysis
8931 * Extensive work on region pointers
8933 * Experimental new language features
8934 * Slices and fixed-size, interior-allocated vectors
8935 * #!-comments for lang versioning, shell execution
8936 * Destructors and iface implementation for classes;
8937 type-parameterized classes and class methods
8938 * 'const' type kind for types that can be used to implement
8939 shared-memory concurrency patterns
8943 * Removal of various obsolete features
8944 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8945 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8947 * Constructs: do-while loops ('do' repurposed), fn binding,
8948 resources (replaced by destructors)
8950 * Compiler reorganization
8951 * Syntax-layer of compiler split into separate crate
8952 * Clang (from LLVM project) integrated into build
8953 * Typechecker split into sub-modules
8956 * New time functions
8957 * Extension methods for many built-in types
8958 * Arc: atomic-refcount read-only / exclusive-use shared cells
8959 * Par: parallel map and search routines
8960 * Extensive work on libuv interface
8961 * Much vector code moved to libraries
8962 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8963 #include, #include_str, #include_bin
8966 * Cargo automatically resolves dependencies
8969 Version 0.2 (2012-03-29)
8970 =========================
8972 * >1500 changes, numerous bugfixes
8974 * New docs and doc tooling
8976 * New port: FreeBSD x86_64
8978 * Compilation model enhancements
8979 * Generics now specialized, multiply instantiated
8980 * Functions now inlined across separate crates
8982 * Scheduling, stack and threading fixes
8983 * Noticeably improved message-passing performance
8984 * Explicit schedulers
8988 * Experimental new language features
8989 * Operator overloading
8993 * Various language extensions
8994 * C-callback function types: 'crust fn ...'
8995 * Infinite-loop construct: 'loop { ... }'
8996 * Shorten 'mutable' to 'mut'
8997 * Required mutable-local qualifier: 'let mut ...'
8998 * Basic glob-exporting: 'export foo::*;'
8999 * Alt now exhaustive, 'alt check' for runtime-checked
9000 * Block-function form of 'for' loop, with 'break' and 'ret'.
9003 * AST quasi-quote syntax extension
9004 * Revived libuv interface
9005 * New modules: core::{future, iter}, std::arena
9006 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9007 * Extensive cleanup, regularization in libstd, libcore
9010 Version 0.1 (2012-01-20)
9011 ===============================
9013 * Most language features work, including:
9014 * Unique pointers, unique closures, move semantics
9015 * Interface-constrained generics
9016 * Static interface dispatch
9018 * Multithread task scheduling
9019 * Typestate predicates
9020 * Failure unwinding, destructors
9021 * Pattern matching and destructuring assignment
9022 * Lightweight block-lambda syntax
9023 * Preliminary macro-by-example
9025 * Compiler works with the following configurations:
9026 * Linux: x86 and x86_64 hosts and targets
9027 * macOS: x86 and x86_64 hosts and targets
9028 * Windows: x86 hosts and targets
9030 * Cross compilation / multi-target configuration supported.
9032 * Preliminary API-documentation and package-management tools included.
9036 * Documentation is incomplete.
9038 * Performance is below intended target.
9040 * Standard library APIs are subject to extensive change, reorganization.
9042 * Language-level versioning is not yet operational - future code will