1 Version 1.31.1 (2018-12-20)
2 ===========================
4 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
5 - [Fix broken go-to-definition in RLS][rls/1171]
6 - [Fix infinite loop on hover in RLS][rls/1170]
8 [56562]: https://github.com/rust-lang/rust/pull/56562
9 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
10 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
12 Version 1.31.0 (2018-12-06)
13 ==========================
17 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
18 - [New lifetime elision rules now allow for eliding lifetimes in functions and
19 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
20 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
22 - [You can now define and use `const` functions.][54835] These are currently
23 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
24 [language reference][const-reference] for what exactly is available.
25 - [You can now use tool lints, which allow you to scope lints from external
26 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
27 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
28 a crate, not just in exported functions.][54451]
29 - [You can now use parentheses in pattern matches.][54497]
33 - [Updated musl to 1.1.20][54430]
37 - [You can now convert `num::NonZero*` types to their raw equivalvents using the
38 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
39 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
40 into `Option<&mut T>` using the `From` trait.][53218]
41 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
47 - [`slice::align_to_mut`]
48 - [`slice::chunks_exact`]
49 - [`slice::chunks_exact_mut`]
51 - [`slice::rchunks_mut`]
52 - [`slice::rchunks_exact`]
53 - [`slice::rchunks_exact_mut`]
58 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
59 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
60 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
62 [52813]: https://github.com/rust-lang/rust/pull/52813/
63 [53218]: https://github.com/rust-lang/rust/pull/53218/
64 [53555]: https://github.com/rust-lang/rust/issues/53555/
65 [54057]: https://github.com/rust-lang/rust/pull/54057/
66 [54240]: https://github.com/rust-lang/rust/pull/54240/
67 [54430]: https://github.com/rust-lang/rust/pull/54430/
68 [54451]: https://github.com/rust-lang/rust/pull/54451/
69 [54497]: https://github.com/rust-lang/rust/pull/54497/
70 [54778]: https://github.com/rust-lang/rust/pull/54778/
71 [54835]: https://github.com/rust-lang/rust/pull/54835/
72 [54870]: https://github.com/rust-lang/rust/pull/54870/
73 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
74 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
75 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
76 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
77 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
78 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
79 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
80 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
81 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
82 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
83 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
84 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
85 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
86 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
88 Version 1.30.1 (2018-11-08)
89 ===========================
91 - [Fixed overflow ICE in rustdoc][54199]
92 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
94 [54199]: https://github.com/rust-lang/rust/pull/54199
95 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
97 Version 1.30.0 (2018-10-25)
98 ==========================
102 - [Procedural macros are now available.][52081] These kinds of macros allow for
103 more powerful code generation. There is a [new chapter available][proc-macros]
104 in the Rust Programming Language book that goes further in depth.
105 - [You can now use keywords as identifiers using the raw identifiers
106 syntax (`r#`),][53236] e.g. `let r#for = true;`
107 - [Using anonymous parameters in traits is now deprecated with a warning and
108 will be a hard error in the 2018 edition.][53272]
109 - [You can now use `crate` in paths.][54404] This allows you to refer to the
110 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
111 - [Using a external crate no longer requires being prefixed with `::`.][54404]
112 Previously, using a external crate in a module without a use statement
113 required `let json = ::serde_json::from_str(foo);` but can now be written
114 as `let json = serde_json::from_str(foo);`.
115 - [You can now apply the `#[used]` attribute to static items to prevent the
116 compiler from optimising them away, even if they appear to be unused,][51363]
117 e.g. `#[used] static FOO: u32 = 1;`
118 - [You can now import and reexport macros from other crates with the `use`
119 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
120 the root module of the crate. If your macro relies on calling other local
121 macros, it is recommended to export with the
122 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
124 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
125 using the `vis` specifier.][53370]
126 - [Non-macro attributes now allow all forms of literals, not just
127 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
128 write `#[attr(true)]`.
129 - [You can now specify a function to handle a panic in the Rust runtime with the
130 `#[panic_handler]` attribute.][51366]
134 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
135 - [Added the `aarch64-unknown-netbsd` target][53165]
139 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
143 - [`Ipv4Addr::BROADCAST`]
144 - [`Ipv4Addr::LOCALHOST`]
145 - [`Ipv4Addr::UNSPECIFIED`]
146 - [`Ipv6Addr::LOCALHOST`]
147 - [`Ipv6Addr::UNSPECIFIED`]
148 - [`Iterator::find_map`]
150 The following methods are replacement methods for `trim_left`, `trim_right`,
151 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
153 - [`str::trim_end_matches`]
155 - [`str::trim_start_matches`]
156 - [`str::trim_start`]
160 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
161 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
162 equivalent to calling `rustdoc --error-format=json`.
163 - [Cargo will now provide a progress bar for builds.][cargo/5995]
167 - [`rustdoc` allows you to specify what edition to treat your code as with the
168 `--edition` option.][54057]
169 - [`rustdoc` now has the `--color` (specify whether to output color) and
170 `--error-format` (specify error format, e.g. `json`) options.][53003]
171 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
172 debug symbols.][53774]
173 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
174 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
176 [50911]: https://github.com/rust-lang/rust/pull/50911/
177 [51363]: https://github.com/rust-lang/rust/pull/51363/
178 [51366]: https://github.com/rust-lang/rust/pull/51366/
179 [52081]: https://github.com/rust-lang/rust/pull/52081/
180 [53003]: https://github.com/rust-lang/rust/pull/53003/
181 [53033]: https://github.com/rust-lang/rust/pull/53033/
182 [53044]: https://github.com/rust-lang/rust/pull/53044/
183 [53165]: https://github.com/rust-lang/rust/pull/53165/
184 [53213]: https://github.com/rust-lang/rust/pull/53213/
185 [53236]: https://github.com/rust-lang/rust/pull/53236/
186 [53272]: https://github.com/rust-lang/rust/pull/53272/
187 [53370]: https://github.com/rust-lang/rust/pull/53370/
188 [53459]: https://github.com/rust-lang/rust/pull/53459/
189 [53774]: https://github.com/rust-lang/rust/pull/53774/
190 [53822]: https://github.com/rust-lang/rust/pull/53822/
191 [54057]: https://github.com/rust-lang/rust/pull/54057/
192 [54146]: https://github.com/rust-lang/rust/pull/54146/
193 [54404]: https://github.com/rust-lang/rust/pull/54404/
194 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
195 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
196 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
197 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
199 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
200 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
201 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
202 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
203 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
204 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
205 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
206 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
207 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
208 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
211 Version 1.29.2 (2018-10-11)
212 ===========================
214 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
215 - The `rls-preview` component on the windows-gnu targets has been restored.
217 [54639]: https://github.com/rust-lang/rust/pull/54639
220 Version 1.29.1 (2018-09-25)
221 ===========================
226 - The standard library's `str::repeat` function contained an out of bounds write
227 caused by an integer overflow. This has been fixed by deterministically
228 panicking when an overflow happens.
230 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
234 Version 1.29.0 (2018-09-13)
235 ==========================
239 - [Bumped minimum LLVM version to 5.0.][51899]
240 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
241 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
245 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
246 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
247 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
248 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
250 - [`Cell<T>` now allows `T` to be unsized.][50494]
251 - [`SocketAddr` is now stable on Redox.][52656]
256 - [`Iterator::flatten`]
261 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
262 `--locked` to disable this behavior.
263 - [`cargo-install` will now allow you to cross compile an install
264 using `--target`.][cargo/5614]
265 - [Added the `cargo-fix` subcommand to automatically move project code from
266 2015 edition to 2018.][cargo/5723]
267 - [`cargo doc` can now optionally document private types using the
268 `--document-private-items` flag.][cargo/5543]
272 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
273 the specified level to that level.][52354] For example `--cap-lints warn`
274 will demote `deny` and `forbid` lints to `warn`.
275 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
276 fails and `101` if there is a panic.][52197]
277 - [A preview of clippy has been made available through rustup.][51122]
278 You can install the preview with `rustup component add clippy-preview`.
282 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
283 Use `str::get_unchecked(begin..end)` instead.
284 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
285 Consider using the `home_dir` function from
286 https://crates.io/crates/dirs instead.
287 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
288 - [`cfg` attributes and `--cfg` command line flags are now more
289 strictly validated.][53893]
291 [53893]: https://github.com/rust-lang/rust/pull/53893/
292 [52861]: https://github.com/rust-lang/rust/pull/52861/
293 [52656]: https://github.com/rust-lang/rust/pull/52656/
294 [52239]: https://github.com/rust-lang/rust/pull/52239/
295 [52330]: https://github.com/rust-lang/rust/pull/52330/
296 [52354]: https://github.com/rust-lang/rust/pull/52354/
297 [52402]: https://github.com/rust-lang/rust/pull/52402/
298 [52103]: https://github.com/rust-lang/rust/pull/52103/
299 [52197]: https://github.com/rust-lang/rust/pull/52197/
300 [51807]: https://github.com/rust-lang/rust/pull/51807/
301 [51899]: https://github.com/rust-lang/rust/pull/51899/
302 [51912]: https://github.com/rust-lang/rust/pull/51912/
303 [51511]: https://github.com/rust-lang/rust/pull/51511/
304 [51619]: https://github.com/rust-lang/rust/pull/51619/
305 [51656]: https://github.com/rust-lang/rust/pull/51656/
306 [51178]: https://github.com/rust-lang/rust/pull/51178/
307 [51122]: https://github.com/rust-lang/rust/pull/51122
308 [50494]: https://github.com/rust-lang/rust/pull/50494/
309 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
310 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
311 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
312 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
313 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
314 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
315 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
318 Version 1.28.0 (2018-08-02)
319 ===========================
323 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
324 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
325 the inner type across Foreign Function Interface (FFI) boundaries.
326 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
327 and can now be used as identifiers.][51196]
328 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
329 stable.][51241] This will allow users to specify a global allocator for
331 - [Unit test functions marked with the `#[test]` attribute can now return
332 `Result<(), E: Debug>` in addition to `()`.][51298]
333 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
334 allows macros to easily target lifetimes.
338 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
339 prioritise making smaller binary sizes. `z` is the same as `s` with the
340 exception that it does not vectorise loops, which typically results in an even
342 - [The short error format is now stable.][49546] Specified with
343 `--error-format=short` this option will provide a more compressed output of
345 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
346 - [Reduced the number of allocations in the macro parser.][50855] This can
347 improve compile times of macro heavy crates on average by 5%.
351 - [Implemented `Default` for `&mut str`.][51306]
352 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
353 - [Implemented `Extend` for `()`.][50234]
354 - [The `Debug` implementation of `time::Duration` should now be more easily
355 human readable.][50364] Previously a `Duration` of one second would printed as
356 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
357 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
358 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
359 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
360 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
361 for `PathBuf`.][50170]
362 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
363 and `Wrapping<i128>`.][50465]
364 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
365 possible.][51050] This can provide up to a 40% speed increase.
366 - [Improved error messages when using `format!`.][50610]
370 - [`Iterator::step_by`]
371 - [`Path::ancestors`]
372 - [`SystemTime::UNIX_EPOCH`]
373 - [`alloc::GlobalAlloc`]
375 - [`alloc::LayoutErr`]
378 - [`alloc::alloc_zeroed`]
381 - [`alloc::handle_alloc_error`]
382 - [`btree_map::Entry::or_default`]
384 - [`hash_map::Entry::or_default`]
385 - [`iter::repeat_with`]
386 - [`num::NonZeroUsize`]
387 - [`num::NonZeroU128`]
388 - [`num::NonZeroU16`]
389 - [`num::NonZeroU32`]
390 - [`num::NonZeroU64`]
392 - [`ops::RangeBounds`]
393 - [`slice::SliceIndex`]
394 - [`slice::from_mut`]
395 - [`slice::from_ref`]
396 - [`{Any + Send + Sync}::downcast_mut`]
397 - [`{Any + Send + Sync}::downcast_ref`]
398 - [`{Any + Send + Sync}::is`]
402 - [Cargo will now no longer allow you to publish crates with build scripts that
403 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
404 considered to be immutable.
408 - [The `suggestion_applicability` field in `rustc`'s json output is now
409 stable.][50486] This will allow dev tools to check whether a code suggestion
414 - [Rust will consider trait objects with duplicated constraints to be the same
415 type as without the duplicated constraint.][51276] For example the below code will
421 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
424 impl Trait + Send + Send {
425 fn test(&self) { println!("two"); }
429 [49546]: https://github.com/rust-lang/rust/pull/49546/
430 [50143]: https://github.com/rust-lang/rust/pull/50143/
431 [50170]: https://github.com/rust-lang/rust/pull/50170/
432 [50234]: https://github.com/rust-lang/rust/pull/50234/
433 [50265]: https://github.com/rust-lang/rust/pull/50265/
434 [50364]: https://github.com/rust-lang/rust/pull/50364/
435 [50385]: https://github.com/rust-lang/rust/pull/50385/
436 [50465]: https://github.com/rust-lang/rust/pull/50465/
437 [50486]: https://github.com/rust-lang/rust/pull/50486/
438 [50554]: https://github.com/rust-lang/rust/pull/50554/
439 [50610]: https://github.com/rust-lang/rust/pull/50610/
440 [50855]: https://github.com/rust-lang/rust/pull/50855/
441 [51050]: https://github.com/rust-lang/rust/pull/51050/
442 [51196]: https://github.com/rust-lang/rust/pull/51196/
443 [51200]: https://github.com/rust-lang/rust/pull/51200/
444 [51241]: https://github.com/rust-lang/rust/pull/51241/
445 [51276]: https://github.com/rust-lang/rust/pull/51276/
446 [51298]: https://github.com/rust-lang/rust/pull/51298/
447 [51306]: https://github.com/rust-lang/rust/pull/51306/
448 [51562]: https://github.com/rust-lang/rust/pull/51562/
449 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
450 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
451 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
452 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
453 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
454 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
455 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
456 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
457 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
458 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
459 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
460 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
461 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
462 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
463 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
464 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
465 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
466 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
467 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
468 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
469 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
470 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
471 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
472 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
473 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
474 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
475 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
476 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
477 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
478 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
480 Version 1.27.2 (2018-07-20)
481 ===========================
486 - The borrow checker was fixed to avoid potential unsoundness when using
487 match ergonomics: [#52213][52213].
489 [52213]: https://github.com/rust-lang/rust/issues/52213
491 Version 1.27.1 (2018-07-10)
492 ===========================
497 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
498 when running, which enabled executing code as some other user on a
499 given machine. This release fixes that vulnerability; you can read
500 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
502 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
507 - The borrow checker was fixed to avoid an additional potential unsoundness when using
508 match ergonomics: [#51415][51415], [#49534][49534].
510 [51415]: https://github.com/rust-lang/rust/issues/51415
511 [49534]: https://github.com/rust-lang/rust/issues/49534
512 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
513 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
515 Version 1.27.0 (2018-06-21)
516 ==========================
520 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
521 be used as an identifier.
522 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
523 bare `Trait` syntax, and should make it clearer when being used in tandem with
524 `impl Trait` because it is equivalent to the following syntax:
525 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
526 `Box<Trait> == Box<dyn Trait>`.
527 - [Attributes on generic parameters such as types and lifetimes are
528 now stable.][48851] e.g.
529 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
530 - [The `#[must_use]` attribute can now also be used on functions as well as
531 types.][48925] It provides a lint that by default warns users when the
532 value returned by a function has not been used.
536 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
540 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
541 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
542 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
543 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
545 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
546 std are now available in core.][49896]
547 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
549 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
550 that the operation isn't done in place.
551 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
552 the `#[must_use]` attribute][49533] to warn about unused potentially
553 expensive allocations.
557 - [`DoubleEndedIterator::rfind`]
558 - [`DoubleEndedIterator::rfold`]
559 - [`DoubleEndedIterator::try_rfold`]
560 - [`Duration::from_micros`]
561 - [`Duration::from_nanos`]
562 - [`Duration::subsec_micros`]
563 - [`Duration::subsec_millis`]
564 - [`HashMap::remove_entry`]
565 - [`Iterator::try_fold`]
566 - [`Iterator::try_for_each`]
569 - [`String::replace_range`]
570 - [`Take::set_limit`]
571 - [`hint::unreachable_unchecked`]
572 - [`os::unix::process::parent_id`]
573 - [`ptr::swap_nonoverlapping`]
574 - [`slice::rsplit_mut`]
576 - [`slice::swap_with_slice`]
580 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
581 `readme`, and `repository` fields.][cargo/5386]
582 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
583 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
584 a different directory than `target` for placing compilation artifacts.
585 - [Cargo will be adding automatic target inference for binaries, benchmarks,
586 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
587 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
588 where cargo would infer a binary, Cargo will produce a warning. You can
589 disable this feature ahead of time by setting any of the following to false:
590 `autobins`, `autobenches`, `autoexamples`, `autotests`.
591 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
592 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
596 - [Added “The Rustc book” into the official documentation.][49707]
597 [“The Rustc book”] documents and teaches how to use the rustc compiler.
598 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
602 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
603 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
604 compile, `"".is_empty()` will still compile.
605 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
606 will only print the inner type.][48553] E.g.
607 `print!("{:?}", AtomicBool::new(true))` will print `true`,
608 not `AtomicBool(true)`.
609 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
610 could enter higher numbers but they were not supported by LLVM. Up to 512MB
611 alignment should cover all use cases.
612 - The `.description()` method on the `std::error::Error` trait
613 [has been soft-deprecated][50163]. It is no longer required to implement it.
615 [48553]: https://github.com/rust-lang/rust/pull/48553/
616 [48851]: https://github.com/rust-lang/rust/pull/48851/
617 [48925]: https://github.com/rust-lang/rust/pull/48925/
618 [49533]: https://github.com/rust-lang/rust/pull/49533/
619 [49623]: https://github.com/rust-lang/rust/pull/49623/
620 [49630]: https://github.com/rust-lang/rust/pull/49630/
621 [49664]: https://github.com/rust-lang/rust/pull/49664/
622 [49699]: https://github.com/rust-lang/rust/pull/49699/
623 [49707]: https://github.com/rust-lang/rust/pull/49707/
624 [49719]: https://github.com/rust-lang/rust/pull/49719/
625 [49896]: https://github.com/rust-lang/rust/pull/49896/
626 [49968]: https://github.com/rust-lang/rust/pull/49968/
627 [50163]: https://github.com/rust-lang/rust/pull/50163
628 [50177]: https://github.com/rust-lang/rust/pull/50177/
629 [50378]: https://github.com/rust-lang/rust/pull/50378/
630 [50398]: https://github.com/rust-lang/rust/pull/50398/
631 [50423]: https://github.com/rust-lang/rust/pull/50423/
632 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
633 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
634 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
635 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
636 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
637 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
638 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
639 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
640 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
641 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
642 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
643 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
644 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
645 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
646 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
647 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
648 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
649 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
650 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
651 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
652 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
653 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
654 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
655 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
656 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
657 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
658 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
659 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
660 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
661 [“The Rustc book”]: https://doc.rust-lang.org/rustc
664 Version 1.26.2 (2018-06-05)
665 ==========================
670 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
672 [51117]: https://github.com/rust-lang/rust/issues/51117
675 Version 1.26.1 (2018-05-29)
676 ==========================
681 - [RLS now works on Windows.][50646]
682 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
688 - [`fn main() -> impl Trait` no longer works for non-Termination
690 This reverts an accidental stabilization.
691 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
692 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
694 [50646]: https://github.com/rust-lang/rust/issues/50646
695 [50656]: https://github.com/rust-lang/rust/pull/50656
696 [50812]: https://github.com/rust-lang/rust/pull/50812
697 [50950]: https://github.com/rust-lang/rust/issues/50950
698 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
700 Version 1.26.0 (2018-05-10)
701 ==========================
705 - [Closures now implement `Copy` and/or `Clone` if all captured variables
706 implement either or both traits.][49299]
707 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
708 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
709 lifetime can be elided.][49458]
710 - [`impl Trait` is now stable allowing you to have abstract types in returns
711 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
712 `fn open(path: impl AsRef<Path>)`.
713 - [Pattern matching will now automatically apply dereferences.][49394]
714 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
715 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
716 - [A lot of operations are now available in a const context.][46882] E.g. You
717 can now index into constant arrays, reference and dereference into constants,
718 and use tuple struct constructors.
719 - [Fixed entry slice patterns are now stable.][48516] E.g.
721 let points = [1, 2, 3, 4];
723 [1, 2, 3, 4] => println!("All points were sequential."),
724 _ => println!("Not all points were sequential."),
731 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
732 - [Fixed exponential projection complexity on nested types.][48296]
733 This can provide up to a ~12% reduction in compile times for certain crates.
734 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
735 to remap path prefixes outputted by the compiler.
736 - [Added `powerpc-unknown-netbsd` target.][48281]
740 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
741 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
742 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
743 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
744 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
745 - [`ascii::escape_default` is now available in libcore.][48735]
746 - [Trailing commas are now supported in std and core macros.][48056]
747 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
748 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
753 - [`*const T::copy_to_nonoverlapping`]
754 - [`*const T::copy_to`]
755 - [`*const T::read_unaligned`]
756 - [`*const T::read_volatile`]
759 - [`*const T::wrapping_add`]
760 - [`*const T::wrapping_sub`]
762 - [`*mut T::copy_to_nonoverlapping`]
763 - [`*mut T::copy_to`]
764 - [`*mut T::read_unaligned`]
765 - [`*mut T::read_volatile`]
767 - [`*mut T::replace`]
770 - [`*mut T::wrapping_add`]
771 - [`*mut T::wrapping_sub`]
772 - [`*mut T::write_bytes`]
773 - [`*mut T::write_unaligned`]
774 - [`*mut T::write_volatile`]
777 - [`FromUtf8Error::as_bytes`]
778 - [`LocalKey::try_with`]
780 - [`btree_map::Entry::and_modify`]
781 - [`fs::read_to_string`]
784 - [`hash_map::Entry::and_modify`]
785 - [`iter::FusedIterator`]
786 - [`ops::RangeInclusive`]
787 - [`ops::RangeToInclusive`]
789 - [`slice::rotate_left`]
790 - [`slice::rotate_right`]
796 - [Cargo will now output path to custom commands when `-v` is
797 passed with `--list`][cargo/5041]
798 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
802 - [The second edition of "The Rust Programming Language" book is now recommended
803 over the first.][48404]
808 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
809 syntax is now invalid.
811 use std::ops::Fn as dyn;
812 fn g(_: Box<dyn(std::fmt::Debug)>) {}
814 - [The result of dereferences are no longer promoted to `'static`.][47408]
818 const PAIR: &(i32, i32) = &(0, 1);
819 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
822 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
823 - [`".e0"` will now no longer parse as `0.0` and will instead cause
825 - [Removed hoedown from rustdoc.][48274]
826 - [Bounds on higher-kinded lifetimes a hard error.][48326]
828 [46882]: https://github.com/rust-lang/rust/pull/46882
829 [47379]: https://github.com/rust-lang/rust/pull/47379
830 [47408]: https://github.com/rust-lang/rust/pull/47408
831 [47813]: https://github.com/rust-lang/rust/pull/47813
832 [48056]: https://github.com/rust-lang/rust/pull/48056
833 [48125]: https://github.com/rust-lang/rust/pull/48125
834 [48166]: https://github.com/rust-lang/rust/pull/48166
835 [48235]: https://github.com/rust-lang/rust/pull/48235
836 [48274]: https://github.com/rust-lang/rust/pull/48274
837 [48281]: https://github.com/rust-lang/rust/pull/48281
838 [48296]: https://github.com/rust-lang/rust/pull/48296
839 [48326]: https://github.com/rust-lang/rust/pull/48326
840 [48359]: https://github.com/rust-lang/rust/pull/48359
841 [48404]: https://github.com/rust-lang/rust/pull/48404
842 [48481]: https://github.com/rust-lang/rust/pull/48481
843 [48516]: https://github.com/rust-lang/rust/pull/48516
844 [48628]: https://github.com/rust-lang/rust/pull/48628
845 [48629]: https://github.com/rust-lang/rust/pull/48629
846 [48657]: https://github.com/rust-lang/rust/pull/48657
847 [48735]: https://github.com/rust-lang/rust/pull/48735
848 [48978]: https://github.com/rust-lang/rust/pull/48978
849 [49101]: https://github.com/rust-lang/rust/pull/49101
850 [49109]: https://github.com/rust-lang/rust/pull/49109
851 [49121]: https://github.com/rust-lang/rust/pull/49121
852 [49162]: https://github.com/rust-lang/rust/pull/49162
853 [49184]: https://github.com/rust-lang/rust/pull/49184
854 [49234]: https://github.com/rust-lang/rust/pull/49234
855 [49255]: https://github.com/rust-lang/rust/pull/49255
856 [49299]: https://github.com/rust-lang/rust/pull/49299
857 [49305]: https://github.com/rust-lang/rust/pull/49305
858 [49394]: https://github.com/rust-lang/rust/pull/49394
859 [49458]: https://github.com/rust-lang/rust/pull/49458
860 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
861 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
862 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
863 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
864 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
865 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
866 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
867 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
868 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
869 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
870 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
871 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
872 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
873 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
874 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
875 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
876 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
877 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
878 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
879 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
880 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
881 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
882 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
883 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
884 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
885 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
886 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
887 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
888 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
889 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
890 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
891 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
892 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
893 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
894 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
895 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
896 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
897 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
898 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
899 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
900 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
901 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
904 Version 1.25.0 (2018-03-29)
905 ==========================
909 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
910 - [You can now use nested groups of imports.][47948]
911 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
912 - [You can now have `|` at the start of a match arm.][47947] e.g.
920 | Foo::B => println!("AB"),
921 | Foo::C => println!("C"),
928 - [Upgraded to LLVM 6.][47828]
929 - [Added `-C lto=val` option.][47521]
930 - [Added `i586-unknown-linux-musl` target][47282]
934 - [Impl Send for `process::Command` on Unix.][47760]
935 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
936 - [`UnsafeCell::into_inner` is now safe.][47204]
937 - [Implement libstd for CloudABI.][47268]
938 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
939 - [Implement `AsRef<Path>` for Component][46985]
940 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
941 - [Moved `Duration` to libcore.][46666]
945 - [`Location::column`]
948 The following functions can now be used in a constant expression.
949 eg. `static MINUTE: Duration = Duration::from_secs(60);`
950 - [`Duration::new`][47300]
951 - [`Duration::from_secs`][47300]
952 - [`Duration::from_millis`][47300]
956 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
957 - [`cargo new` now defaults to creating a binary crate, instead of a
958 library crate.][cargo/5029]
962 - [Rust by example is now shipped with new releases][46196]
966 - [Deprecated `net::lookup_host`.][47510]
967 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
968 - The borrow checker was sometimes incorrectly permitting overlapping borrows
969 around indexing operations (see [#47349][47349]). This has been fixed (which also
970 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
971 - [Removed deprecated unstable attribute `#[simd]`.][47251]
973 [33903]: https://github.com/rust-lang/rust/pull/33903
974 [47947]: https://github.com/rust-lang/rust/pull/47947
975 [47948]: https://github.com/rust-lang/rust/pull/47948
976 [47760]: https://github.com/rust-lang/rust/pull/47760
977 [47790]: https://github.com/rust-lang/rust/pull/47790
978 [47828]: https://github.com/rust-lang/rust/pull/47828
979 [47398]: https://github.com/rust-lang/rust/pull/47398
980 [47510]: https://github.com/rust-lang/rust/pull/47510
981 [47521]: https://github.com/rust-lang/rust/pull/47521
982 [47204]: https://github.com/rust-lang/rust/pull/47204
983 [47251]: https://github.com/rust-lang/rust/pull/47251
984 [47268]: https://github.com/rust-lang/rust/pull/47268
985 [47282]: https://github.com/rust-lang/rust/pull/47282
986 [47300]: https://github.com/rust-lang/rust/pull/47300
987 [47349]: https://github.com/rust-lang/rust/pull/47349
988 [46931]: https://github.com/rust-lang/rust/pull/46931
989 [46985]: https://github.com/rust-lang/rust/pull/46985
990 [47006]: https://github.com/rust-lang/rust/pull/47006
991 [46830]: https://github.com/rust-lang/rust/pull/46830
992 [46095]: https://github.com/rust-lang/rust/pull/46095
993 [46666]: https://github.com/rust-lang/rust/pull/46666
994 [46196]: https://github.com/rust-lang/rust/pull/46196
995 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
996 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
997 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
998 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
999 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1002 Version 1.24.1 (2018-03-01)
1003 ==========================
1005 - [Do not abort when unwinding through FFI][48251]
1006 - [Emit UTF-16 files for linker arguments on Windows][48318]
1007 - [Make the error index generator work again][48308]
1008 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1010 [48251]: https://github.com/rust-lang/rust/issues/48251
1011 [48308]: https://github.com/rust-lang/rust/issues/48308
1012 [48318]: https://github.com/rust-lang/rust/issues/48318
1013 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1016 Version 1.24.0 (2018-02-15)
1017 ==========================
1021 - [External `sysv64` ffi is now available.][46528]
1022 eg. `extern "sysv64" fn foo () {}`
1026 - [rustc now uses 16 codegen units by default for release builds.][46910]
1027 For the fastest builds, utilize `codegen-units=1`.
1028 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1029 - [Add `aarch64-unknown-openbsd` support][46760]
1033 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1034 improvement in performance in the majority of cases.
1035 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1036 with Windows.][46798]
1037 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1038 - [impl `From<bool>` for `AtomicBool`][46293]
1039 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1040 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1041 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1042 - [float::from_bits now just uses transmute.][46012] This provides
1043 some optimisations from LLVM.
1044 - [Copied `AsciiExt` methods onto `char`][46077]
1045 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1046 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1047 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1048 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1052 - [`RefCell::replace`]
1054 - [`atomic::spin_loop_hint`]
1056 The following functions can now be used in a constant expression.
1057 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1059 - [`AtomicBool::new`][46287]
1060 - [`AtomicUsize::new`][46287]
1061 - [`AtomicIsize::new`][46287]
1062 - [`AtomicPtr::new`][46287]
1063 - [`Cell::new`][46287]
1064 - [`{integer}::min_value`][46287]
1065 - [`{integer}::max_value`][46287]
1066 - [`mem::size_of`][46287]
1067 - [`mem::align_of`][46287]
1068 - [`ptr::null`][46287]
1069 - [`ptr::null_mut`][46287]
1070 - [`RefCell::new`][46287]
1071 - [`UnsafeCell::new`][46287]
1075 - [Added a `workspace.default-members` config that
1076 overrides implied `--all` in virtual workspaces.][cargo/4743]
1077 - [Enable incremental by default on development builds.][cargo/4817] Also added
1078 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
1079 per-project or global basis respectively.
1086 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
1087 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
1088 in accordance with IETF RFC 4291 §2.2.
1089 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1090 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1091 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1092 - [Leading zeros in tuple struct members is now an error][47084]
1093 - [`column!()` macro is one-based instead of zero-based][46977]
1094 - [`fmt::Arguments` can no longer be shared across threads][45198]
1095 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1096 - [Cargo sets a different working directory for the compiler][cargo/4788]
1098 [44884]: https://github.com/rust-lang/rust/pull/44884
1099 [45198]: https://github.com/rust-lang/rust/pull/45198
1100 [45506]: https://github.com/rust-lang/rust/pull/45506
1101 [45904]: https://github.com/rust-lang/rust/pull/45904
1102 [45990]: https://github.com/rust-lang/rust/pull/45990
1103 [46012]: https://github.com/rust-lang/rust/pull/46012
1104 [46077]: https://github.com/rust-lang/rust/pull/46077
1105 [46094]: https://github.com/rust-lang/rust/pull/46094
1106 [46284]: https://github.com/rust-lang/rust/pull/46284
1107 [46287]: https://github.com/rust-lang/rust/pull/46287
1108 [46293]: https://github.com/rust-lang/rust/pull/46293
1109 [46528]: https://github.com/rust-lang/rust/pull/46528
1110 [46671]: https://github.com/rust-lang/rust/pull/46671
1111 [46713]: https://github.com/rust-lang/rust/pull/46713
1112 [46735]: https://github.com/rust-lang/rust/pull/46735
1113 [46749]: https://github.com/rust-lang/rust/pull/46749
1114 [46760]: https://github.com/rust-lang/rust/pull/46760
1115 [46798]: https://github.com/rust-lang/rust/pull/46798
1116 [46828]: https://github.com/rust-lang/rust/pull/46828
1117 [46831]: https://github.com/rust-lang/rust/pull/46831
1118 [46833]: https://github.com/rust-lang/rust/pull/46833
1119 [46910]: https://github.com/rust-lang/rust/pull/46910
1120 [46977]: https://github.com/rust-lang/rust/pull/46977
1121 [47018]: https://github.com/rust-lang/rust/pull/47018
1122 [47080]: https://github.com/rust-lang/rust/pull/47080
1123 [47084]: https://github.com/rust-lang/rust/pull/47084
1124 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1125 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1126 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1127 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1128 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1129 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1132 Version 1.23.0 (2018-01-04)
1133 ==========================
1137 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1138 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1139 Which should fix some confusing errors in some operations.
1143 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1144 undefined behavior.][45920]
1145 - [rustc now suggests renaming import if names clash.][45660]
1146 - [Display errors/warnings correctly when there are zero-width or
1147 wide characters.][45711]
1148 - [rustc now avoids unnecessary copies of arguments that are
1149 simple bindings][45380] This should improve memory usage on average by 5-10%.
1150 - [Updated musl used to build musl rustc to 1.1.17][45393]
1154 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1155 - [Implement Hash for raw pointers to unsized types][45483]
1156 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1157 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1158 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1159 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1160 and `<*mut T>::as_mut`][44932]
1161 - [Optimized `Thread::{park, unpark}` implementation][45524]
1162 - [Improved `SliceExt::binary_search` performance.][45333]
1163 - [impl `FromIterator<()>` for `()`][45379]
1164 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1172 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1173 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1174 - [Added unit test checking to `cargo check`][cargo/4592]
1175 - [Cargo now lets you install a specific version
1176 using `cargo install --version`][cargo/4637]
1180 - [Releases now ship with the Cargo book documentation.][45692]
1181 - [rustdoc now prints rendering warnings on every run.][45324]
1185 - [Changes have been made to type equality to make it more correct,
1186 in rare cases this could break some code.][45853] [Tracking issue for
1187 further information][45852]
1188 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1189 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1190 Android 9, the minimum supported version is Android 14.
1191 - [Bumped the minimum LLVM to 3.9][45326]
1193 [44042]: https://github.com/rust-lang/rust/pull/44042
1194 [44932]: https://github.com/rust-lang/rust/pull/44932
1195 [45267]: https://github.com/rust-lang/rust/pull/45267
1196 [45324]: https://github.com/rust-lang/rust/pull/45324
1197 [45326]: https://github.com/rust-lang/rust/pull/45326
1198 [45333]: https://github.com/rust-lang/rust/pull/45333
1199 [45379]: https://github.com/rust-lang/rust/pull/45379
1200 [45380]: https://github.com/rust-lang/rust/pull/45380
1201 [45393]: https://github.com/rust-lang/rust/pull/45393
1202 [45435]: https://github.com/rust-lang/rust/pull/45435
1203 [45483]: https://github.com/rust-lang/rust/pull/45483
1204 [45524]: https://github.com/rust-lang/rust/pull/45524
1205 [45571]: https://github.com/rust-lang/rust/pull/45571
1206 [45580]: https://github.com/rust-lang/rust/pull/45580
1207 [45610]: https://github.com/rust-lang/rust/pull/45610
1208 [45660]: https://github.com/rust-lang/rust/pull/45660
1209 [45692]: https://github.com/rust-lang/rust/pull/45692
1210 [45711]: https://github.com/rust-lang/rust/pull/45711
1211 [45772]: https://github.com/rust-lang/rust/pull/45772
1212 [45852]: https://github.com/rust-lang/rust/issues/45852
1213 [45853]: https://github.com/rust-lang/rust/pull/45853
1214 [45887]: https://github.com/rust-lang/rust/pull/45887
1215 [45920]: https://github.com/rust-lang/rust/pull/45920
1216 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1217 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1218 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1221 Version 1.22.1 (2017-11-22)
1222 ==========================
1224 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1226 [46183]: https://github.com/rust-lang/rust/pull/46183
1228 Version 1.22.0 (2017-11-22)
1229 ==========================
1233 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1234 - [Now accepts underscores in unicode escapes][43716]
1235 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1236 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1240 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1241 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1242 This should decrease compile times for debug builds.
1243 - [strict memory alignment now enabled on ARMv6][45094]
1244 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1248 - [Allow atomic operations up to 32 bits
1249 on `armv5te_unknown_linux_gnueabi`][44978]
1250 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1251 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1252 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1253 - [Properly detect overflow in `Instant += Duration`.][44220]
1254 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1255 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1256 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1263 - [Cargo will now build multi file examples in subdirectories of the `examples`
1264 folder that have a `main.rs` file.][cargo/4496]
1265 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1266 the old format will continue to work and can be updated with `cargo update`.
1267 - [Now supports vendoring git repositories][cargo/3992]
1271 - [`libbacktrace` is now available on Apple platforms.][44251]
1272 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1273 This now lets you specify that a given code example will fail to compile.
1277 - [The minimum Android version that rustc can build for has been bumped
1278 to `4.0` from `2.3`][45656]
1279 - [Allowing `T op= &T` for numeric types has broken some type
1280 inference cases][45480]
1283 [42526]: https://github.com/rust-lang/rust/pull/42526
1284 [43017]: https://github.com/rust-lang/rust/pull/43017
1285 [43716]: https://github.com/rust-lang/rust/pull/43716
1286 [43949]: https://github.com/rust-lang/rust/pull/43949
1287 [44015]: https://github.com/rust-lang/rust/pull/44015
1288 [44220]: https://github.com/rust-lang/rust/pull/44220
1289 [44251]: https://github.com/rust-lang/rust/pull/44251
1290 [44287]: https://github.com/rust-lang/rust/pull/44287
1291 [44303]: https://github.com/rust-lang/rust/pull/44303
1292 [44456]: https://github.com/rust-lang/rust/pull/44456
1293 [44466]: https://github.com/rust-lang/rust/pull/44466
1294 [44895]: https://github.com/rust-lang/rust/pull/44895
1295 [44966]: https://github.com/rust-lang/rust/pull/44966
1296 [44978]: https://github.com/rust-lang/rust/pull/44978
1297 [45041]: https://github.com/rust-lang/rust/pull/45041
1298 [45064]: https://github.com/rust-lang/rust/pull/45064
1299 [45075]: https://github.com/rust-lang/rust/pull/45075
1300 [45094]: https://github.com/rust-lang/rust/pull/45094
1301 [45095]: https://github.com/rust-lang/rust/pull/45095
1302 [45480]: https://github.com/rust-lang/rust/issues/45480
1303 [45656]: https://github.com/rust-lang/rust/pull/45656
1304 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1305 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1306 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1313 Version 1.21.0 (2017-10-12)
1314 ==========================
1318 - [You can now use static references for literals.][43838]
1322 let x: &'static u32 = &0;
1325 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1328 my_macro!(Vec<i32>::new); // Always worked
1329 my_macro!(Vec::<i32>::new); // Now works
1334 - [Upgraded jemalloc to 4.5.0][43911]
1335 - [Enabled unwinding panics on Redox][43917]
1336 - [Now runs LLVM in parallel during translation phase.][43506]
1337 This should reduce peak memory usage.
1341 - [Generate builtin impls for `Clone` for all arrays and tuples that
1342 are `T: Clone`][43690]
1343 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1344 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1345 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1350 [`std::mem::discriminant`]
1354 - [You can now call `cargo install` with multiple package names][cargo/4216]
1355 - [Cargo commands inside a virtual workspace will now implicitly
1356 pass `--all`][cargo/4335]
1357 - [Added a `[patch]` section to `Cargo.toml` to handle
1358 prepublication dependencies][cargo/4123] [RFC 1969]
1359 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1360 like patterns][cargo/4270]
1361 - [Added the `--all-targets` option][cargo/4400]
1362 - [Using required dependencies as a feature is now deprecated and emits
1363 a warning][cargo/4364]
1368 - [Cargo docs are moving][43916]
1369 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1370 - [The rustdoc book is now available][43863]
1371 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1372 - [Added a preview of RLS has been made available through rustup][44204]
1373 Install with `rustup component add rls-preview`
1374 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1375 Previously only showed `std::os::unix`.
1379 - [Changes in method matching against higher-ranked types][43880] This may cause
1380 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1381 - [rustc's JSON error output's byte position start at top of file.][42973]
1382 Was previously relative to the rustc's internal `CodeMap` struct which
1383 required the unstable library `libsyntax` to correctly use.
1384 - [`unused_results` lint no longer ignores booleans][43728]
1386 [42565]: https://github.com/rust-lang/rust/pull/42565
1387 [42973]: https://github.com/rust-lang/rust/pull/42973
1388 [43348]: https://github.com/rust-lang/rust/pull/43348
1389 [43459]: https://github.com/rust-lang/rust/pull/43459
1390 [43506]: https://github.com/rust-lang/rust/pull/43506
1391 [43540]: https://github.com/rust-lang/rust/pull/43540
1392 [43690]: https://github.com/rust-lang/rust/pull/43690
1393 [43728]: https://github.com/rust-lang/rust/pull/43728
1394 [43838]: https://github.com/rust-lang/rust/pull/43838
1395 [43863]: https://github.com/rust-lang/rust/pull/43863
1396 [43880]: https://github.com/rust-lang/rust/pull/43880
1397 [43911]: https://github.com/rust-lang/rust/pull/43911
1398 [43916]: https://github.com/rust-lang/rust/pull/43916
1399 [43917]: https://github.com/rust-lang/rust/pull/43917
1400 [44204]: https://github.com/rust-lang/rust/pull/44204
1401 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1402 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1403 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1404 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1405 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1406 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1407 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1408 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1409 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1411 Version 1.20.0 (2017-08-31)
1412 ===========================
1416 - [Associated constants are now stabilised.][42809]
1417 - [A lot of macro bugs are now fixed.][42913]
1422 - [Struct fields are now properly coerced to the expected field type.][42807]
1423 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1424 `wasm32-experimental-emscripten` target.
1425 - [Changed some of the error messages to be more helpful.][42033]
1426 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1428 - [rustc now reports the total number of errors on compilation failure][43015]
1429 previously this was only the number of errors in the pass that failed.
1430 - [Expansion in rustc has been sped up 29x.][42533]
1431 - [added `msp430-none-elf` target.][43099]
1432 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1434 - [Fixes backtraces on Redox][43228]
1435 - [rustc now identifies different versions of same crate when absolute paths of
1436 different types match in an error message.][42826]
1442 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1443 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1445 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1446 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1447 - [Impl `Clone` for `DefaultHasher`.][42799]
1448 - [Impl `Sync` for `SyncSender`.][42397]
1449 - [Impl `FromStr` for `char`][42271]
1450 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1452 - [allow messages in the `unimplemented!()` macro.][42155]
1453 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1454 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1455 - [Upgrade to Unicode 10.0.0][42999]
1456 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1457 - [Skip the main thread's manual stack guard on Linux][43072]
1458 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1459 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1461 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1466 - [`CStr::into_c_string`]
1467 - [`CString::as_c_str`]
1468 - [`CString::into_boxed_c_str`]
1469 - [`Chain::get_mut`]
1470 - [`Chain::get_ref`]
1471 - [`Chain::into_inner`]
1472 - [`Option::get_or_insert_with`]
1473 - [`Option::get_or_insert`]
1474 - [`OsStr::into_os_string`]
1475 - [`OsString::into_boxed_os_str`]
1478 - [`Utf8Error::error_len`]
1479 - [`char::EscapeDebug`]
1480 - [`char::escape_debug`]
1481 - [`compile_error!`]
1482 - [`f32::from_bits`]
1484 - [`f64::from_bits`]
1486 - [`mem::ManuallyDrop`]
1487 - [`slice::sort_unstable_by_key`]
1488 - [`slice::sort_unstable_by`]
1489 - [`slice::sort_unstable`]
1490 - [`str::from_boxed_utf8_unchecked`]
1491 - [`str::as_bytes_mut`]
1492 - [`str::as_bytes_mut`]
1493 - [`str::from_utf8_mut`]
1494 - [`str::from_utf8_unchecked_mut`]
1496 - [`str::get_unchecked_mut`]
1497 - [`str::get_unchecked`]
1499 - [`str::into_boxed_bytes`]
1504 - [Cargo API token location moved from `~/.cargo/config` to
1505 `~/.cargo/credentials`.][cargo/3978]
1506 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1507 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1508 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1509 - [You can now specify version of a binary when installed through
1510 `cargo install` using `--vers`.][cargo/4229]
1511 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1512 failure.][cargo/4248]
1513 - [Changed the convention around which file is the crate root.][cargo/4259]
1514 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1515 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1520 - [Functions with `'static` in their return types will now not be as usable as
1521 if they were using lifetime parameters instead.][42417]
1522 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1523 takes the sign of NaN into account where previously didn't.][42430]
1525 [42033]: https://github.com/rust-lang/rust/pull/42033
1526 [42155]: https://github.com/rust-lang/rust/pull/42155
1527 [42271]: https://github.com/rust-lang/rust/pull/42271
1528 [42397]: https://github.com/rust-lang/rust/pull/42397
1529 [42417]: https://github.com/rust-lang/rust/pull/42417
1530 [42430]: https://github.com/rust-lang/rust/pull/42430
1531 [42431]: https://github.com/rust-lang/rust/pull/42431
1532 [42533]: https://github.com/rust-lang/rust/pull/42533
1533 [42571]: https://github.com/rust-lang/rust/pull/42571
1534 [42613]: https://github.com/rust-lang/rust/pull/42613
1535 [42799]: https://github.com/rust-lang/rust/pull/42799
1536 [42807]: https://github.com/rust-lang/rust/pull/42807
1537 [42809]: https://github.com/rust-lang/rust/pull/42809
1538 [42822]: https://github.com/rust-lang/rust/pull/42822
1539 [42826]: https://github.com/rust-lang/rust/pull/42826
1540 [42854]: https://github.com/rust-lang/rust/pull/42854
1541 [42913]: https://github.com/rust-lang/rust/pull/42913
1542 [42999]: https://github.com/rust-lang/rust/pull/42999
1543 [43011]: https://github.com/rust-lang/rust/pull/43011
1544 [43015]: https://github.com/rust-lang/rust/pull/43015
1545 [43072]: https://github.com/rust-lang/rust/pull/43072
1546 [43077]: https://github.com/rust-lang/rust/pull/43077
1547 [43097]: https://github.com/rust-lang/rust/pull/43097
1548 [43099]: https://github.com/rust-lang/rust/pull/43099
1549 [43170]: https://github.com/rust-lang/rust/pull/43170
1550 [43178]: https://github.com/rust-lang/rust/pull/43178
1551 [43185]: https://github.com/rust-lang/rust/pull/43185
1552 [43228]: https://github.com/rust-lang/rust/pull/43228
1553 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1554 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1555 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1556 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1557 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1558 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1559 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1560 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1561 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1562 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1563 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1564 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1565 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1566 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1567 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1568 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1569 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1570 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1571 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1572 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1573 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1574 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1575 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1576 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1577 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1578 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1579 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1580 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1581 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1582 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1583 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1584 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1585 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1586 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1587 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1588 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1589 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1590 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1591 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1594 Version 1.19.0 (2017-07-20)
1595 ===========================
1600 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1601 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1602 - [Macro recursion limit increased to 1024 from 64.][41676]
1603 - [Added lint for detecting unused macros.][41907]
1604 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1605 For example: `let x = loop { break 7; };`
1606 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1607 contain `Copy` types and cannot have a `Drop` implementation.
1608 Example: `union Foo { bar: u8, baz: usize }`
1609 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1610 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1615 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1616 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1617 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1618 you should use `--target armv7-linux-androideabi`.
1619 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1620 - [Minor optimisation of string operations.][42037]
1621 - [Compiler error message is now `aborting due to previous error(s)` instead of
1622 `aborting due to N previous errors`][42150] This was previously inaccurate and
1623 would only count certain kinds of errors.
1624 - [The compiler now supports Visual Studio 2017][42225]
1625 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1626 - [Added a lot][42264] of [new error codes][42302]
1627 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1628 libraries with C Run-time Libraries(CRT) to be statically linked.
1629 - [Fixed various ARM codegen bugs][42740]
1634 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1635 `Extend<Cow<'a, str>>`][41449]
1636 - [`Vec` now implements `From<&mut [T]>`][41530]
1637 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1638 - [`SplitWhitespace` now implements `Clone`][41659]
1639 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1641 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1642 macros, but for printing to stderr.
1647 - [`OsString::shrink_to_fit`]
1650 - [`thread::ThreadId`]
1655 - [Build scripts can now add environment variables to the environment
1656 the crate is being compiled in.
1657 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1658 - [Subcommands now replace the current process rather than spawning a new
1659 child process][cargo/3970]
1660 - [Workspace members can now accept glob file patterns][cargo/3979]
1661 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1662 the members in a given workspace.][cargo/3988]
1663 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1664 - [Target directory path is now in the cargo metadata][cargo/4022]
1665 - [Cargo no longer checks out a local working directory for the
1666 crates.io index][cargo/4026] This should provide smaller file size for the
1667 registry, and improve cloning times, especially on Windows machines.
1668 - [Added an `--exclude` option for excluding certain packages when using the
1669 `--all` option][cargo/4031]
1670 - [Cargo will now automatically retry when receiving a 5xx error
1671 from crates.io][cargo/4032]
1672 - [The `--features` option now accepts multiple comma or space
1673 delimited values.][cargo/4084]
1674 - [Added support for custom target specific runners][cargo/3954]
1679 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1681 - [Rust will now release XZ compressed packages][rust-installer/57]
1682 - [rustup will now prefer to download rust packages with
1683 XZ compression][rustup/1100] over GZip packages.
1684 - [Added the ability to escape `#` in rust documentation][41785] By adding
1685 additional `#`'s ie. `##` is now `#`
1690 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1691 - [`-Z` flags are now no longer allowed to be used on the stable
1692 compiler.][41751] This has been a warning for a year previous to this.
1693 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1694 longer works][42844]. Users should migrate to the built-in `check`
1695 command, which has been available since 1.16.
1696 - [Ending a float literal with `._` is now a hard error.
1697 Example: `42._` .][41946]
1698 - [Any use of a private `extern crate` outside of its module is now a
1699 hard error.][36886] This was previously a warning.
1700 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1701 relative while the `::` prefix makes a path absolute, but was ignored and the
1702 path was relative regardless.
1703 - [Floating point constants in match patterns is now a hard error][36890]
1704 This was previously a warning.
1705 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1706 match patterns is now a hard error][36891] This was previously a warning.
1707 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1709 - [From the pound escape, lines consisting of multiple `#`s are
1711 - [It is an error to re-export private enum variants][42460]. This is
1712 known to break a number of crates that depend on an older version of
1714 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1715 to use it to find the linker, and the build will fail where it did
1716 not previously][42607]
1718 [36886]: https://github.com/rust-lang/rust/issues/36886
1719 [36888]: https://github.com/rust-lang/rust/issues/36888
1720 [36890]: https://github.com/rust-lang/rust/issues/36890
1721 [36891]: https://github.com/rust-lang/rust/issues/36891
1722 [36892]: https://github.com/rust-lang/rust/issues/36892
1723 [37406]: https://github.com/rust-lang/rust/issues/37406
1724 [39983]: https://github.com/rust-lang/rust/pull/39983
1725 [41145]: https://github.com/rust-lang/rust/pull/41145
1726 [41192]: https://github.com/rust-lang/rust/pull/41192
1727 [41258]: https://github.com/rust-lang/rust/pull/41258
1728 [41370]: https://github.com/rust-lang/rust/pull/41370
1729 [41449]: https://github.com/rust-lang/rust/pull/41449
1730 [41530]: https://github.com/rust-lang/rust/pull/41530
1731 [41624]: https://github.com/rust-lang/rust/pull/41624
1732 [41656]: https://github.com/rust-lang/rust/pull/41656
1733 [41659]: https://github.com/rust-lang/rust/pull/41659
1734 [41676]: https://github.com/rust-lang/rust/pull/41676
1735 [41751]: https://github.com/rust-lang/rust/pull/41751
1736 [41764]: https://github.com/rust-lang/rust/pull/41764
1737 [41785]: https://github.com/rust-lang/rust/pull/41785
1738 [41873]: https://github.com/rust-lang/rust/pull/41873
1739 [41907]: https://github.com/rust-lang/rust/pull/41907
1740 [41946]: https://github.com/rust-lang/rust/pull/41946
1741 [42016]: https://github.com/rust-lang/rust/pull/42016
1742 [42037]: https://github.com/rust-lang/rust/pull/42037
1743 [42068]: https://github.com/rust-lang/rust/pull/42068
1744 [42150]: https://github.com/rust-lang/rust/pull/42150
1745 [42162]: https://github.com/rust-lang/rust/pull/42162
1746 [42225]: https://github.com/rust-lang/rust/pull/42225
1747 [42264]: https://github.com/rust-lang/rust/pull/42264
1748 [42302]: https://github.com/rust-lang/rust/pull/42302
1749 [42460]: https://github.com/rust-lang/rust/issues/42460
1750 [42607]: https://github.com/rust-lang/rust/issues/42607
1751 [42740]: https://github.com/rust-lang/rust/pull/42740
1752 [42844]: https://github.com/rust-lang/rust/issues/42844
1753 [42948]: https://github.com/rust-lang/rust/pull/42948
1754 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1755 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1756 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1757 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1758 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1759 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1760 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1761 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1762 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1763 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1764 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1765 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1766 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1767 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1768 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1769 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1770 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1771 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1772 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1773 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1774 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1775 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1778 Version 1.18.0 (2017-06-08)
1779 ===========================
1784 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1785 make the item visible to just that module tree. Also accepts the keyword
1786 `crate` to make something public to the whole crate but not users of the
1787 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1788 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1789 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1790 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1791 types like `Write + Send`, trailing `+` are now supported in trait objects,
1792 and better error reporting for trait objects starting with `?Sized`.
1793 - [0e+10 is now a valid floating point literal][40589]
1794 - [Now warns if you bind a lifetime parameter to 'static][40734]
1795 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1796 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1797 representation in some cases.][40377]
1802 - [rustc can now emit mir with `--emit mir`][39891]
1803 - [Improved LLVM IR for trivial functions][40367]
1804 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1805 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1806 opportunities found through profiling
1807 - [Improved backtrace formatting when panicking][38165]
1812 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1813 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1814 iteration or reallocation.
1815 - [Simplified HashMap Bucket interface][40561] provides performance
1816 improvements for iterating and cloning.
1817 - [Specialize Vec::from_elem to use calloc][40409]
1818 - [Fixed Race condition in fs::create_dir_all][39799]
1819 - [No longer caching stdio on Windows][40516]
1820 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1821 2.50%~ faster and in one case now 12.50% faster.
1822 - [Optimized `AtomicBool::fetch_nand`][41143]
1827 - [`Child::try_wait`]
1828 - [`HashMap::retain`]
1829 - [`HashSet::retain`]
1831 - [`TcpStream::peek`]
1832 - [`UdpSocket::peek`]
1833 - [`UdpSocket::peek_from`]
1838 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1839 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1840 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1841 - [Added Android build support][cargo/3885]
1842 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1843 of a certain type, for example `cargo build --bins` will build all
1845 - [Added support for haiku][cargo/3952]
1850 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1851 - [Added rust-windbg script for better debugging on Windows][39983]
1852 - [Rust now uses the official cross compiler for NetBSD][40612]
1853 - [rustdoc now accepts `#` at the start of files][40828]
1854 - [Fixed jemalloc support for musl][41168]
1859 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1860 always placed after the sign if it exists and before the digits. With the `#`
1861 flag the zeroes are placed after the prefix and before the digits.
1862 - [Due to the struct field optimisation][40377], using `transmute` on structs
1863 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1864 always been undefined behavior, but is now more likely to break in practice.
1865 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1866 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1867 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1868 - [Overlapping inherent `impl`s are now a hard error][40728]
1869 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1870 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1871 `out.asm` and `out.ll` instead of only one of the filetypes.
1872 - [ calling a function that returns `Self` will no longer work][41805] when
1873 the size of `Self` cannot be statically determined.
1874 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1875 this has caused a few regressions namely:
1877 - Changed the link order of local static/dynamic libraries (respecting the
1878 order on given rather than having the compiler reorder).
1879 - Changed how MinGW is linked, native code linked to dynamic libraries
1880 may require manually linking to the gcc support library (for the native
1883 [38165]: https://github.com/rust-lang/rust/pull/38165
1884 [39799]: https://github.com/rust-lang/rust/pull/39799
1885 [39891]: https://github.com/rust-lang/rust/pull/39891
1886 [39983]: https://github.com/rust-lang/rust/pull/39983
1887 [40043]: https://github.com/rust-lang/rust/pull/40043
1888 [40241]: https://github.com/rust-lang/rust/pull/40241
1889 [40338]: https://github.com/rust-lang/rust/pull/40338
1890 [40367]: https://github.com/rust-lang/rust/pull/40367
1891 [40377]: https://github.com/rust-lang/rust/pull/40377
1892 [40409]: https://github.com/rust-lang/rust/pull/40409
1893 [40516]: https://github.com/rust-lang/rust/pull/40516
1894 [40556]: https://github.com/rust-lang/rust/pull/40556
1895 [40561]: https://github.com/rust-lang/rust/pull/40561
1896 [40589]: https://github.com/rust-lang/rust/pull/40589
1897 [40612]: https://github.com/rust-lang/rust/pull/40612
1898 [40723]: https://github.com/rust-lang/rust/pull/40723
1899 [40728]: https://github.com/rust-lang/rust/pull/40728
1900 [40731]: https://github.com/rust-lang/rust/pull/40731
1901 [40734]: https://github.com/rust-lang/rust/pull/40734
1902 [40805]: https://github.com/rust-lang/rust/pull/40805
1903 [40807]: https://github.com/rust-lang/rust/pull/40807
1904 [40828]: https://github.com/rust-lang/rust/pull/40828
1905 [40870]: https://github.com/rust-lang/rust/pull/40870
1906 [41085]: https://github.com/rust-lang/rust/pull/41085
1907 [41143]: https://github.com/rust-lang/rust/pull/41143
1908 [41168]: https://github.com/rust-lang/rust/pull/41168
1909 [41270]: https://github.com/rust-lang/rust/issues/41270
1910 [41469]: https://github.com/rust-lang/rust/pull/41469
1911 [41805]: https://github.com/rust-lang/rust/issues/41805
1912 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1913 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1914 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1915 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1916 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1917 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1918 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1919 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1920 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1921 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1922 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1923 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1924 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1925 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1928 Version 1.17.0 (2017-04-27)
1929 ===========================
1934 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1935 * [Fields of structs may be initialized without duplicating the field/variable
1936 names][39761]. [RFC 1682]
1937 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1938 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1939 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1940 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1941 `'b`. Soundness fix.
1942 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1943 * [Static variables may contain references to other statics][40027]
1948 * [Exit quickly on only `--emit dep-info`][40336]
1949 * [Make `-C relocation-model` more correctly determine whether the linker
1950 creates a position-independent executable][40245]
1951 * [Add `-C overflow-checks` to directly control whether integer overflow
1953 * [The rustc type checker now checks items on demand instead of in a single
1954 in-order pass][40008]. This is mostly an internal refactoring in support of
1955 future work, including incremental type checking, but also resolves [RFC
1956 1647], allowing `Self` to appear in `impl` `where` clauses.
1957 * [Optimize vtable loads][39995]
1958 * [Turn off vectorization for Emscripten targets][39990]
1959 * [Provide suggestions for unknown macros imported with `use`][39953]
1960 * [Fix ICEs in path resolution][39939]
1961 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1962 * [Add clearer error message using `&str + &str`][39116]
1973 * [`Ordering::then`]
1974 * [`Ordering::then_with`]
1975 * [`BTreeMap::range`]
1976 * [`BTreeMap::range_mut`]
1977 * [`collections::Bound`]
1978 * [`process::abort`]
1979 * [`ptr::read_unaligned`]
1980 * [`ptr::write_unaligned`]
1981 * [`Result::expect_err`]
1984 * [`Cell::into_inner`]
1990 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1991 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1992 * [`String` implements `FromIterator<&char>`][40028]
1993 * `Box` [implements][40009] a number of new conversions:
1994 `From<Box<str>> for String`,
1995 `From<Box<[T]>> for Vec<T>`,
1996 `From<Box<CStr>> for CString`,
1997 `From<Box<OsStr>> for OsString`,
1998 `From<Box<Path>> for PathBuf`,
1999 `Into<Box<str>> for String`,
2000 `Into<Box<[T]>> for Vec<T>`,
2001 `Into<Box<CStr>> for CString`,
2002 `Into<Box<OsStr>> for OsString`,
2003 `Into<Box<Path>> for PathBuf`,
2004 `Default for Box<str>`,
2005 `Default for Box<CStr>`,
2006 `Default for Box<OsStr>`,
2007 `From<&CStr> for Box<CStr>`,
2008 `From<&OsStr> for Box<OsStr>`,
2009 `From<&Path> for Box<Path>`
2010 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2011 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2012 * [Slightly optimize `slice::sort`][39538]
2013 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2014 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2015 `Box<str>` implements `From<&str>`][39438]
2016 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2017 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2018 * [`format!` estimates the needed capacity before writing a string][39356]
2019 * [Support unprivileged symlink creation in Windows][38921]
2020 * [`PathBuf` implements `Default`][38764]
2021 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2022 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2023 and poor hash functions.
2028 * [Add `cargo check --all`][cargo/3731]
2029 * [Add an option to ignore SSL revocation checking][cargo/3699]
2030 * [Add `cargo run --package`][cargo/3691]
2031 * [Add `required_features`][cargo/3667]
2032 * [Assume `build.rs` is a build script][cargo/3664]
2033 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2038 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2040 * [The "Unstable Book" documents nightly-only features][ubook]
2041 * [Improve the style of the sidebar in rustdoc output][40265]
2042 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2043 * [Fix MSP430 breakage due to `i128`][40257]
2044 * [Preliminary Solaris/SPARCv9 support][39903]
2045 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2046 run without installing the MSVC runtime.
2047 * [`rustdoc --test` includes file names in test names][39788]
2048 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2049 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2050 * [Initial support for `aarch64-unknown-freebsd`][39491]
2051 * [Initial support for `i686-unknown-netbsd`][39426]
2052 * [This release no longer includes the old makefile build system][39431]. Rust
2053 is built with a custom build system, written in Rust, and with Cargo.
2054 * [Add Debug implementations for libcollection structs][39002]
2055 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2056 * [`--test-threads=0` produces an error][38945]
2057 * [`rustup` installs documentation by default][40526]
2058 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2059 WinDbg and Visual Studio to improve the debugging experience.
2064 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
2065 workaround, either use MSVC 2015 or run vcvars.bat.
2066 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2067 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
2068 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
2070 * [`format!` and `Display::to_string` panic if an underlying formatting
2071 implementation returns an error][40117]. Previously the error was silently
2072 ignored. It is incorrect for `write_fmt` to return an error when writing
2074 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
2075 crates were marked stable and could be accessed from the stable toolchain.
2076 * [Rust git source no longer includes vendored crates][39728]. Those that need
2077 to build with vendored crates should build from release tarballs.
2078 * [Fix inert attributes from `proc_macro_derives`][39572]
2079 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
2080 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
2082 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
2083 existing code generally ignores the type of dead-code unless a type-hint is
2084 provided; this can cause surprising inference interactions particularly around
2085 defaulting. The new code uniformly ignores the result type of dead-code.
2086 * [Tuple-struct constructors with private fields are no longer visible][38932]
2087 * [Lifetime parameters that do not appear in the arguments are now considered
2088 early-bound][38897], resolving a soundness bug (#[32330]). The
2089 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2091 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2092 * [Make transmuting from fn item types to pointer-sized types a hard
2095 [27787]: https://github.com/rust-lang/rust/issues/27787
2096 [32330]: https://github.com/rust-lang/rust/issues/32330
2097 [34198]: https://github.com/rust-lang/rust/pull/34198
2098 [38161]: https://github.com/rust-lang/rust/pull/38161
2099 [38368]: https://github.com/rust-lang/rust/pull/38368
2100 [38584]: https://github.com/rust-lang/rust/issues/38584
2101 [38661]: https://github.com/rust-lang/rust/pull/38661
2102 [38764]: https://github.com/rust-lang/rust/pull/38764
2103 [38864]: https://github.com/rust-lang/rust/issues/38864
2104 [38897]: https://github.com/rust-lang/rust/pull/38897
2105 [38921]: https://github.com/rust-lang/rust/pull/38921
2106 [38932]: https://github.com/rust-lang/rust/pull/38932
2107 [38945]: https://github.com/rust-lang/rust/pull/38945
2108 [38981]: https://github.com/rust-lang/rust/pull/38981
2109 [39002]: https://github.com/rust-lang/rust/pull/39002
2110 [39116]: https://github.com/rust-lang/rust/pull/39116
2111 [39193]: https://github.com/rust-lang/rust/pull/39193
2112 [39265]: https://github.com/rust-lang/rust/pull/39265
2113 [39356]: https://github.com/rust-lang/rust/pull/39356
2114 [39372]: https://github.com/rust-lang/rust/pull/39372
2115 [39426]: https://github.com/rust-lang/rust/pull/39426
2116 [39431]: https://github.com/rust-lang/rust/pull/39431
2117 [39438]: https://github.com/rust-lang/rust/pull/39438
2118 [39440]: https://github.com/rust-lang/rust/pull/39440
2119 [39485]: https://github.com/rust-lang/rust/pull/39485
2120 [39491]: https://github.com/rust-lang/rust/pull/39491
2121 [39518]: https://github.com/rust-lang/rust/pull/39518
2122 [39538]: https://github.com/rust-lang/rust/pull/39538
2123 [39572]: https://github.com/rust-lang/rust/pull/39572
2124 [39633]: https://github.com/rust-lang/rust/pull/39633
2125 [39642]: https://github.com/rust-lang/rust/pull/39642
2126 [39728]: https://github.com/rust-lang/rust/pull/39728
2127 [39761]: https://github.com/rust-lang/rust/pull/39761
2128 [39788]: https://github.com/rust-lang/rust/pull/39788
2129 [39793]: https://github.com/rust-lang/rust/pull/39793
2130 [39837]: https://github.com/rust-lang/rust/pull/39837
2131 [39843]: https://github.com/rust-lang/rust/pull/39843
2132 [39851]: https://github.com/rust-lang/rust/pull/39851
2133 [39903]: https://github.com/rust-lang/rust/pull/39903
2134 [39939]: https://github.com/rust-lang/rust/pull/39939
2135 [39953]: https://github.com/rust-lang/rust/pull/39953
2136 [39960]: https://github.com/rust-lang/rust/pull/39960
2137 [39990]: https://github.com/rust-lang/rust/pull/39990
2138 [39995]: https://github.com/rust-lang/rust/pull/39995
2139 [40008]: https://github.com/rust-lang/rust/pull/40008
2140 [40009]: https://github.com/rust-lang/rust/pull/40009
2141 [40027]: https://github.com/rust-lang/rust/pull/40027
2142 [40028]: https://github.com/rust-lang/rust/pull/40028
2143 [40037]: https://github.com/rust-lang/rust/pull/40037
2144 [40117]: https://github.com/rust-lang/rust/pull/40117
2145 [40166]: https://github.com/rust-lang/rust/pull/40166
2146 [40245]: https://github.com/rust-lang/rust/pull/40245
2147 [40257]: https://github.com/rust-lang/rust/pull/40257
2148 [40261]: https://github.com/rust-lang/rust/pull/40261
2149 [40265]: https://github.com/rust-lang/rust/pull/40265
2150 [40319]: https://github.com/rust-lang/rust/pull/40319
2151 [40336]: https://github.com/rust-lang/rust/pull/40336
2152 [40526]: https://github.com/rust-lang/rust/pull/40526
2153 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2154 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2155 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2156 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2157 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2158 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2159 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2160 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2161 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2162 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2163 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2164 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2165 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2166 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2167 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2168 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2169 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2170 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2171 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2172 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2173 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2174 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2175 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2176 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2177 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2178 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2179 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2180 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2181 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2182 [mdbook]: https://crates.io/crates/mdbook
2183 [ubook]: https://doc.rust-lang.org/unstable-book/
2186 Version 1.16.0 (2017-03-16)
2187 ===========================
2192 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2193 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2194 match patterns][38069]
2195 * [Clean up semantics of `self` in an import list][38313]
2196 * [`Self` may appear in `impl` headers][38920]
2197 * [`Self` may appear in struct expressions][39282]
2202 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2203 a `.rmeta` file containing only crate metadata][38571]. This can be
2204 used by tools like the Rust Language Service to perform
2205 metadata-only builds.
2206 * [Levenshtein based typo suggestions now work in most places, while
2207 previously they worked only for fields and sometimes for local
2208 variables][38927]. Together with the overhaul of "no
2209 resolution"/"unexpected resolution" errors (#[38154]) they result in
2210 large and systematic improvement in resolution diagnostics.
2211 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2213 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2214 * [`rustc` no longer attempts to provide "consider using an explicit
2215 lifetime" suggestions][37057]. They were inaccurate.
2220 * [`VecDeque::truncate`]
2221 * [`VecDeque::resize`]
2222 * [`String::insert_str`]
2223 * [`Duration::checked_add`]
2224 * [`Duration::checked_sub`]
2225 * [`Duration::checked_div`]
2226 * [`Duration::checked_mul`]
2229 * [`SocketAddr::is_ipv4`]
2230 * [`SocketAddr::is_ipv6`]
2231 * [`IpAddr::is_ipv4`]
2232 * [`IpAddr::is_ipv6`]
2234 * [`Vec::dedup_by_key`]
2235 * [`Result::unwrap_or_default`]
2236 * [`<*const T>::wrapping_offset`]
2237 * [`<*mut T>::wrapping_offset`]
2238 * `CommandExt::creation_flags`
2239 * [`File::set_permissions`]
2240 * [`String::split_off`]
2245 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2246 their argument by `Borrow` parameter][37761]
2247 * [All public types in std implement `Debug`][38006]
2248 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2249 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2250 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2252 * [std: Fix partial writes in `LineWriter`][38062]
2253 * [std: Clamp max read/write sizes on Unix][38062]
2254 * [Use more specific panic message for `&str` slicing errors][38066]
2255 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2256 functionality cannot be achieved in std currently.
2257 * [`writeln!`, like `println!`, now accepts a form with no string
2258 or formatting arguments, to just print a newline][38469]
2259 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2260 * [Reduce the size of static data in `std_unicode::tables`][38781]
2261 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2262 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2264 * [`Duration` implements `Sum`][38712]
2265 * [`String` implements `ToSocketAddrs`][39048]
2270 * [The `cargo check` command does a type check of a project without
2271 building it][cargo/3296]
2272 * [crates.io will display CI badges from Travis and AppVeyor, if
2273 specified in Cargo.toml][cargo/3546]
2274 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2275 * [Compilation profiles accept integer values for `debug`, in addition
2276 to `true` and `false`. These are passed to `rustc` as the value to
2277 `-C debuginfo`][cargo/3534]
2278 * [Implement `cargo --version --verbose`][cargo/3604]
2279 * [All builds now output 'dep-info' build dependencies compatible with
2280 make and ninja][cargo/3557]
2281 * [Build all workspace members with `build --all`][cargo/3511]
2282 * [Document all workspace members with `doc --all`][cargo/3515]
2283 * [Path deps outside workspace are not members][cargo/3443]
2288 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2289 the path to the Rust implementation][38589]
2290 * [The `armv7-linux-androideabi` target no longer enables NEON
2291 extensions, per Google's ABI guide][38413]
2292 * [The stock standard library can be compiled for Redox OS][38401]
2293 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2295 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2297 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2302 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2303 match patterns][38069]
2304 * In this release, references to uninhabited types can not be
2305 pattern-matched. This was accidentally allowed in 1.15.
2306 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2307 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2309 * [Clean up semantics of `self` in an import list][38313]
2310 * Reimplemented lifetime elision. This change was almost entirely compatible
2311 with existing code, but it did close a number of small bugs and loopholes,
2312 as well as being more accepting in some other [cases][41105].
2314 [37057]: https://github.com/rust-lang/rust/pull/37057
2315 [37761]: https://github.com/rust-lang/rust/pull/37761
2316 [38006]: https://github.com/rust-lang/rust/pull/38006
2317 [38051]: https://github.com/rust-lang/rust/pull/38051
2318 [38062]: https://github.com/rust-lang/rust/pull/38062
2319 [38062]: https://github.com/rust-lang/rust/pull/38622
2320 [38066]: https://github.com/rust-lang/rust/pull/38066
2321 [38069]: https://github.com/rust-lang/rust/pull/38069
2322 [38131]: https://github.com/rust-lang/rust/pull/38131
2323 [38154]: https://github.com/rust-lang/rust/pull/38154
2324 [38274]: https://github.com/rust-lang/rust/pull/38274
2325 [38304]: https://github.com/rust-lang/rust/pull/38304
2326 [38313]: https://github.com/rust-lang/rust/pull/38313
2327 [38314]: https://github.com/rust-lang/rust/pull/38314
2328 [38327]: https://github.com/rust-lang/rust/pull/38327
2329 [38401]: https://github.com/rust-lang/rust/pull/38401
2330 [38413]: https://github.com/rust-lang/rust/pull/38413
2331 [38469]: https://github.com/rust-lang/rust/pull/38469
2332 [38559]: https://github.com/rust-lang/rust/pull/38559
2333 [38571]: https://github.com/rust-lang/rust/pull/38571
2334 [38580]: https://github.com/rust-lang/rust/pull/38580
2335 [38589]: https://github.com/rust-lang/rust/pull/38589
2336 [38670]: https://github.com/rust-lang/rust/pull/38670
2337 [38712]: https://github.com/rust-lang/rust/pull/38712
2338 [38726]: https://github.com/rust-lang/rust/pull/38726
2339 [38781]: https://github.com/rust-lang/rust/pull/38781
2340 [38798]: https://github.com/rust-lang/rust/pull/38798
2341 [38909]: https://github.com/rust-lang/rust/pull/38909
2342 [38920]: https://github.com/rust-lang/rust/pull/38920
2343 [38927]: https://github.com/rust-lang/rust/pull/38927
2344 [39048]: https://github.com/rust-lang/rust/pull/39048
2345 [39282]: https://github.com/rust-lang/rust/pull/39282
2346 [39379]: https://github.com/rust-lang/rust/pull/39379
2347 [41105]: https://github.com/rust-lang/rust/issues/41105
2348 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2349 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2350 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2351 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2352 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2353 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2354 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2355 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2356 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2357 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2358 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2359 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2360 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2361 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2362 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2363 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2364 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2365 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2366 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2367 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2368 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2369 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2370 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2371 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2372 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2373 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2374 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2375 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2376 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2377 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2380 Version 1.15.1 (2017-02-09)
2381 ===========================
2383 * [Fix IntoIter::as_mut_slice's signature][39466]
2384 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2386 [39466]: https://github.com/rust-lang/rust/pull/39466
2387 [39523]: https://github.com/rust-lang/rust/pull/39523
2390 Version 1.15.0 (2017-02-02)
2391 ===========================
2396 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2397 stable. This allows popular code-generating crates like Serde and Diesel to
2398 work ergonomically. [RFC 1681].
2399 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2400 with curly braces][36868]. Part of [RFC 1506].
2401 * [A number of minor changes to name resolution have been activated][37127].
2402 They add up to more consistent semantics, allowing for future evolution of
2403 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2404 details of what is different. The breaking changes here have been transitioned
2405 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2406 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2408 * [`?Sized` can be used in `where` clauses][37791]
2409 * [There is now a limit on the size of monomorphized types and it can be
2410 modified with the `#![type_size_limit]` crate attribute, similarly to
2411 the `#![recursion_limit]` attribute][37789]
2416 * [On Windows, the compiler will apply dllimport attributes when linking to
2417 extern functions][37973]. Additional attributes and flags can control which
2418 library kind is linked and its name. [RFC 1717].
2419 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2420 * [The `--test` flag works with procedural macro crates][38107]
2421 * [Fix `extern "aapcs" fn` ABI][37814]
2422 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2423 * [The `format!` expander recognizes incorrect `printf` and shell-style
2424 formatting directives and suggests the correct format][37613].
2425 * [Only report one error for all unused imports in an import list][37456]
2427 Compiler Performance
2428 --------------------
2430 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2431 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2432 * [Don't clone in `UnificationTable::probe`][37848]
2433 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2434 * [Use small vectors in type walker][37760]
2435 * [Macro expansion performance was improved][37701]
2436 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2437 * [Replace FNV with a faster hash function][37229]
2442 * [`std::iter::Iterator::min_by`]
2443 * [`std::iter::Iterator::max_by`]
2444 * [`std::os::*::fs::FileExt`]
2445 * [`std::sync::atomic::Atomic*::get_mut`]
2446 * [`std::sync::atomic::Atomic*::into_inner`]
2447 * [`std::vec::IntoIter::as_slice`]
2448 * [`std::vec::IntoIter::as_mut_slice`]
2449 * [`std::sync::mpsc::Receiver::try_iter`]
2450 * [`std::os::unix::process::CommandExt::before_exec`]
2451 * [`std::rc::Rc::strong_count`]
2452 * [`std::rc::Rc::weak_count`]
2453 * [`std::sync::Arc::strong_count`]
2454 * [`std::sync::Arc::weak_count`]
2455 * [`std::char::encode_utf8`]
2456 * [`std::char::encode_utf16`]
2457 * [`std::cell::Ref::clone`]
2458 * [`std::io::Take::into_inner`]
2463 * [The standard sorting algorithm has been rewritten for dramatic performance
2464 improvements][38192]. It is a hybrid merge sort, drawing influences from
2465 Timsort. Previously it was a naive merge sort.
2466 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2467 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2469 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2470 and `char_indices().last()`][37882]
2471 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2472 * [Chinese characters display correctly in `fmt::Debug`][37855]
2473 * [Derive `Default` for `Duration`][37699]
2474 * [Support creation of anonymous pipes on WinXP/2k][37677]
2475 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2476 * [Don't pass overlapped handles to processes][38835]
2481 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2482 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2483 should instead check the variable at runtime with `std::env`. That the value
2484 was set at build time was a bug, and incorrect when cross-compiling. This
2485 change is known to cause breakage.
2486 * [Add `--all` flag to `cargo test`][cargo/3221]
2487 * [Compile statically against the MSVC CRT][cargo/3363]
2488 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2489 * [Link OpenSSL statically on OSX][cargo/3311]
2490 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2491 * [Test for bad path overrides with summaries][cargo/3336]
2492 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2493 * [Fix retrying crate downloads for network errors][cargo/3348]
2494 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2495 * [Emit more info on --message-format=json][cargo/3319]
2496 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2497 * [Don't ignore errors in workspace manifest][cargo/3409]
2498 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2503 * [Test runners (binaries built with `--test`) now support a `--list` argument
2504 that lists the tests it contains][38185]
2505 * [Test runners now support a `--exact` argument that makes the test filter
2506 match exactly, instead of matching only a substring of the test name][38181]
2507 * [rustdoc supports a `--playground-url` flag][37763]
2508 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2513 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2514 continue to be used in this release by passing `--disable-rustbuild` to the
2515 configure script, but they will be deleted soon. Note that the new build
2516 system uses a different on-disk layout that will likely affect any scripts
2518 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2520 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2521 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2527 * [A number of minor changes to name resolution have been activated][37127].
2528 They add up to more consistent semantics, allowing for future evolution of
2529 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2530 details of what is different. The breaking changes here have been transitioned
2531 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2532 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2533 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2534 should instead check the variable at runtime with `std::env`. That the value
2535 was set at build time was a bug, and incorrect when cross-compiling. This
2536 change is known to cause breakage.
2537 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2538 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2539 1.10 and is now an error by default. It will become a hard error in the near
2541 * [The semantics relating modules to file system directories are changing in
2542 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2543 lint, which is a warning in this release, and will become a hard error in the
2545 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2546 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2547 the underlying iterator][37834]
2549 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2550 [33685]: https://github.com/rust-lang/rust/issues/33685
2551 [36868]: https://github.com/rust-lang/rust/pull/36868
2552 [37127]: https://github.com/rust-lang/rust/pull/37127
2553 [37229]: https://github.com/rust-lang/rust/pull/37229
2554 [37456]: https://github.com/rust-lang/rust/pull/37456
2555 [37527]: https://github.com/rust-lang/rust/pull/37527
2556 [37602]: https://github.com/rust-lang/rust/pull/37602
2557 [37613]: https://github.com/rust-lang/rust/pull/37613
2558 [37615]: https://github.com/rust-lang/rust/pull/37615
2559 [37636]: https://github.com/rust-lang/rust/pull/37636
2560 [37627]: https://github.com/rust-lang/rust/pull/37627
2561 [37642]: https://github.com/rust-lang/rust/pull/37642
2562 [37677]: https://github.com/rust-lang/rust/pull/37677
2563 [37699]: https://github.com/rust-lang/rust/pull/37699
2564 [37701]: https://github.com/rust-lang/rust/pull/37701
2565 [37705]: https://github.com/rust-lang/rust/pull/37705
2566 [37749]: https://github.com/rust-lang/rust/pull/37749
2567 [37760]: https://github.com/rust-lang/rust/pull/37760
2568 [37763]: https://github.com/rust-lang/rust/pull/37763
2569 [37764]: https://github.com/rust-lang/rust/pull/37764
2570 [37789]: https://github.com/rust-lang/rust/pull/37789
2571 [37791]: https://github.com/rust-lang/rust/pull/37791
2572 [37814]: https://github.com/rust-lang/rust/pull/37814
2573 [37817]: https://github.com/rust-lang/rust/pull/37817
2574 [37834]: https://github.com/rust-lang/rust/pull/37834
2575 [37848]: https://github.com/rust-lang/rust/pull/37848
2576 [37855]: https://github.com/rust-lang/rust/pull/37855
2577 [37882]: https://github.com/rust-lang/rust/pull/37882
2578 [37888]: https://github.com/rust-lang/rust/pull/37888
2579 [37973]: https://github.com/rust-lang/rust/pull/37973
2580 [37979]: https://github.com/rust-lang/rust/pull/37979
2581 [38086]: https://github.com/rust-lang/rust/pull/38086
2582 [38107]: https://github.com/rust-lang/rust/pull/38107
2583 [38117]: https://github.com/rust-lang/rust/pull/38117
2584 [38134]: https://github.com/rust-lang/rust/pull/38134
2585 [38146]: https://github.com/rust-lang/rust/pull/38146
2586 [38181]: https://github.com/rust-lang/rust/pull/38181
2587 [38182]: https://github.com/rust-lang/rust/pull/38182
2588 [38185]: https://github.com/rust-lang/rust/pull/38185
2589 [38192]: https://github.com/rust-lang/rust/pull/38192
2590 [38279]: https://github.com/rust-lang/rust/pull/38279
2591 [38835]: https://github.com/rust-lang/rust/pull/38835
2592 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2593 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2594 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2595 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2596 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2597 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2598 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2599 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2600 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2601 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2602 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2603 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2604 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2605 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2606 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2607 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2608 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2609 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2610 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2611 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2612 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2613 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2614 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2615 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2616 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2617 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2618 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2619 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2620 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2621 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2622 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2623 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2624 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2625 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2626 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2627 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2628 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2629 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2632 Version 1.14.0 (2016-12-22)
2633 ===========================
2638 * [`..` matches multiple tuple fields in enum variants, structs
2639 and tuples][36843]. [RFC 1492].
2640 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2641 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2642 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2643 dereferencing][36822]
2648 * [Mark enums with non-zero discriminant as non-zero][37224]
2649 * [Lower-case `static mut` names are linted like other
2650 statics and consts][37162]
2651 * [Fix ICE on some macros in const integer positions
2652 (e.g. `[u8; m!()]`)][36819]
2653 * [Improve error message and snippet for "did you mean `x`"][36798]
2654 * [Add a panic-strategy field to the target specification][36794]
2655 * [Include LLVM version in `--version --verbose`][37200]
2657 Compile-time Optimizations
2658 --------------------------
2660 * [Improve macro expansion performance][37569]
2661 * [Shrink `Expr_::ExprInlineAsm`][37445]
2662 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2663 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2664 * [Avoid more allocations when compiling html5ever][37373]
2665 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2666 * [Avoid some allocations in the macro parser][37318]
2667 * [Use a faster deflate setting][37298]
2668 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2669 during interning of slices][37270]
2670 * [Optimize `write_metadata`][37267]
2671 * [Don't process obligation forest cycles when stalled][37231]
2672 * [Avoid many `CrateConfig` clones][37161]
2673 * [Optimize `Substs::super_fold_with`][37108]
2674 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2675 * [Speed up `plug_leaks`][36917]
2680 * [`println!()`, with no arguments, prints newline][36825].
2681 Previously, an empty string was required to achieve the same.
2682 * [`Wrapping` impls standard binary and unary operators, as well as
2683 the `Sum` and `Product` iterators][37356]
2684 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2686 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2687 `VecDeque` iterators][37315]
2688 * [Improve `SipHasher` performance on small values][37312]
2689 * [Add Iterator trait TrustedLen to enable better FromIterator /
2691 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2692 * [`ReadDir` implements `Debug`][37221]
2693 * [Implement `RefUnwindSafe` for atomic types][37178]
2694 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2695 * [Avoid allocations in `Decoder::read_str`][37064]
2696 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2697 * [Impl `Debug` for raw pointers to unsized data][36880]
2698 * [Don't reuse `HashMap` random seeds][37470]
2699 * [The internal memory layout of `HashMap` is more cache-friendly, for
2700 significant improvements in some operations][36692]
2701 * [`HashMap` uses less memory on 32-bit architectures][36595]
2702 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2707 * [Expose rustc cfg values to build scripts][cargo/3243]
2708 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2709 * [Fix passing --features when testing multiple packages][cargo/3280]
2710 * [Use a single profile set per workspace][cargo/3249]
2711 * [Load `replace` sections from lock files][cargo/3220]
2712 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2717 * [rustup is the recommended Rust installation method][1.14rustup]
2718 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2719 S390x. These are [tier 2] platforms and may have major defects. Follow the
2720 instructions on the website to install, or add the targets to an existing
2721 installation with `rustup target add`. The new target triples are:
2722 - `mips-unknown-linux-gnu`
2723 - `mipsel-unknown-linux-gnu`
2724 - `mips64-unknown-linux-gnuabi64`
2725 - `mips64el-unknown-linux-gnuabi64 `
2726 - `powerpc-unknown-linux-gnu`
2727 - `powerpc64-unknown-linux-gnu`
2728 - `powerpc64le-unknown-linux-gnu`
2729 - `s390x-unknown-linux-gnu `
2730 * This release includes target (std) builds for ARM Linux running MUSL
2731 libc. These are [tier 2] platforms and may have major defects. Add the
2732 following triples to an existing rustup installation with `rustup target add`:
2733 - `arm-unknown-linux-musleabi`
2734 - `arm-unknown-linux-musleabihf`
2735 - `armv7-unknown-linux-musleabihf`
2736 * This release includes [experimental support for WebAssembly][1.14wasm], via
2737 the `wasm32-unknown-emscripten` target. This target is known to have major
2738 defects. Please test, report, and fix.
2739 * rustup no longer installs documentation by default. Run `rustup
2740 component add rust-docs` to install.
2741 * [Fix line stepping in debugger][37310]
2742 * [Enable line number debuginfo in releases][37280]
2747 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2748 * [Add support for Fuchsia OS][37313]
2749 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2754 * [A number of forward-compatibility lints used by the compiler
2755 to gradually introduce language changes have been converted
2756 to deny by default][36894]:
2757 - ["use of inaccessible extern crate erroneously allowed"][36886]
2758 - ["type parameter default erroneously allowed in invalid location"][36887]
2759 - ["detects super or self keywords at the beginning of global path"][36888]
2760 - ["two overlapping inherent impls define an item with the same name
2761 were erroneously allowed"][36889]
2762 - ["floating-point constants cannot be used in patterns"][36890]
2763 - ["constants of struct or enum type can only be used in a pattern if
2764 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2765 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2766 * [Prohibit patterns in trait methods without bodies][37378]
2767 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2768 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2769 * [The `$crate` macro variable is accepted in fewer locations][37213]
2770 * [Impls specifying extra region requirements beyond the trait
2771 they implement are rejected][37167]
2772 * [Enums may not be unsized][37111]. Unsized enums are intended to
2773 work but never have. For now they are forbidden.
2774 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2776 [tier 2]: https://forge.rust-lang.org/platform-support.html
2777 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2778 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2779 [36430]: https://github.com/rust-lang/rust/pull/36430
2780 [36595]: https://github.com/rust-lang/rust/pull/36595
2781 [36595]: https://github.com/rust-lang/rust/pull/36595
2782 [36692]: https://github.com/rust-lang/rust/pull/36692
2783 [36767]: https://github.com/rust-lang/rust/pull/36767
2784 [36794]: https://github.com/rust-lang/rust/pull/36794
2785 [36798]: https://github.com/rust-lang/rust/pull/36798
2786 [36819]: https://github.com/rust-lang/rust/pull/36819
2787 [36822]: https://github.com/rust-lang/rust/pull/36822
2788 [36825]: https://github.com/rust-lang/rust/pull/36825
2789 [36843]: https://github.com/rust-lang/rust/pull/36843
2790 [36880]: https://github.com/rust-lang/rust/pull/36880
2791 [36886]: https://github.com/rust-lang/rust/issues/36886
2792 [36887]: https://github.com/rust-lang/rust/issues/36887
2793 [36888]: https://github.com/rust-lang/rust/issues/36888
2794 [36889]: https://github.com/rust-lang/rust/issues/36889
2795 [36890]: https://github.com/rust-lang/rust/issues/36890
2796 [36891]: https://github.com/rust-lang/rust/issues/36891
2797 [36892]: https://github.com/rust-lang/rust/issues/36892
2798 [36894]: https://github.com/rust-lang/rust/pull/36894
2799 [36917]: https://github.com/rust-lang/rust/pull/36917
2800 [36993]: https://github.com/rust-lang/rust/pull/36993
2801 [37037]: https://github.com/rust-lang/rust/pull/37037
2802 [37064]: https://github.com/rust-lang/rust/pull/37064
2803 [37094]: https://github.com/rust-lang/rust/pull/37094
2804 [37108]: https://github.com/rust-lang/rust/pull/37108
2805 [37111]: https://github.com/rust-lang/rust/pull/37111
2806 [37161]: https://github.com/rust-lang/rust/pull/37161
2807 [37162]: https://github.com/rust-lang/rust/pull/37162
2808 [37167]: https://github.com/rust-lang/rust/pull/37167
2809 [37178]: https://github.com/rust-lang/rust/pull/37178
2810 [37200]: https://github.com/rust-lang/rust/pull/37200
2811 [37213]: https://github.com/rust-lang/rust/pull/37213
2812 [37221]: https://github.com/rust-lang/rust/pull/37221
2813 [37224]: https://github.com/rust-lang/rust/pull/37224
2814 [37230]: https://github.com/rust-lang/rust/pull/37230
2815 [37231]: https://github.com/rust-lang/rust/pull/37231
2816 [37247]: https://github.com/rust-lang/rust/pull/37247
2817 [37267]: https://github.com/rust-lang/rust/pull/37267
2818 [37270]: https://github.com/rust-lang/rust/pull/37270
2819 [37273]: https://github.com/rust-lang/rust/pull/37273
2820 [37280]: https://github.com/rust-lang/rust/pull/37280
2821 [37298]: https://github.com/rust-lang/rust/pull/37298
2822 [37306]: https://github.com/rust-lang/rust/pull/37306
2823 [37310]: https://github.com/rust-lang/rust/pull/37310
2824 [37312]: https://github.com/rust-lang/rust/pull/37312
2825 [37313]: https://github.com/rust-lang/rust/pull/37313
2826 [37315]: https://github.com/rust-lang/rust/pull/37315
2827 [37318]: https://github.com/rust-lang/rust/pull/37318
2828 [37322]: https://github.com/rust-lang/rust/pull/37322
2829 [37326]: https://github.com/rust-lang/rust/pull/37326
2830 [37351]: https://github.com/rust-lang/rust/pull/37351
2831 [37356]: https://github.com/rust-lang/rust/pull/37356
2832 [37367]: https://github.com/rust-lang/rust/pull/37367
2833 [37373]: https://github.com/rust-lang/rust/pull/37373
2834 [37378]: https://github.com/rust-lang/rust/pull/37378
2835 [37389]: https://github.com/rust-lang/rust/pull/37389
2836 [37392]: https://github.com/rust-lang/rust/pull/37392
2837 [37427]: https://github.com/rust-lang/rust/pull/37427
2838 [37439]: https://github.com/rust-lang/rust/pull/37439
2839 [37445]: https://github.com/rust-lang/rust/pull/37445
2840 [37470]: https://github.com/rust-lang/rust/pull/37470
2841 [37569]: https://github.com/rust-lang/rust/pull/37569
2842 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2843 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2844 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2845 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2846 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2847 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2848 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2851 Version 1.13.0 (2016-11-10)
2852 ===========================
2857 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2858 errors, like the `try!` macro, described in [RFC 0243].
2859 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2860 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2861 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2862 * [Fix lifetime rules for 'if' conditions][36029]
2863 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2868 * [Add the `-C link-arg` argument][36574]
2869 * [Remove the old AST-based backend from rustc_trans][35764]
2870 * [Don't enable NEON by default on armv7 Linux][35814]
2871 * [Fix debug line number info for macro expansions][35238]
2872 * [Do not emit "class method" debuginfo for types that are not
2873 DICompositeType][36008]
2874 * [Warn about multiple conflicting #[repr] hints][34623]
2875 * [When sizing DST, don't double-count nested struct prefixes][36351]
2876 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2877 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2878 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2879 * [Expand macros without recursing to avoid stack overflows][36214]
2884 * [Replace macro backtraces with labeled local uses][35702]
2885 * [Improve error message for misplaced doc comments][33922]
2886 * [Buffer unix and lock windows to prevent message interleaving][35975]
2887 * [Update lifetime errors to specifically note temporaries][36171]
2888 * [Special case a few colors for Windows][36178]
2889 * [Suggest `use self` when such an import resolves][36289]
2890 * [Be more specific when type parameter shadows primitive type][36338]
2891 * Many minor improvements
2893 Compile-time Optimizations
2894 --------------------------
2896 * [Compute and cache HIR hashes at beginning][35854]
2897 * [Don't hash types in loan paths][36004]
2898 * [Cache projections in trans][35761]
2899 * [Optimize the parser's last token handling][36527]
2900 * [Only instantiate #[inline] functions in codegen units referencing
2901 them][36524]. This leads to big improvements in cases where crates export
2902 define many inline functions without using them directly.
2903 * [Lazily allocate TypedArena's first chunk][36592]
2904 * [Don't allocate during default HashSet creation][36734]
2911 * [`overflowing_abs`]
2912 * [`RefCell::try_borrow`]
2913 * [`RefCell::try_borrow_mut`]
2918 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2919 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2921 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2922 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2923 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2924 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2925 * [Use arc4rand on FreeBSD][35884]
2926 * [memrchr: Correct aligned offset computation][35969]
2927 * [Improve Demangling of Rust Symbols][36059]
2928 * [Use monotonic time in condition variables][35048]
2929 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2930 * [Implement conversion traits for `char`][35755]
2931 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2932 * [Zero first byte of CString on drop][36264]
2933 * [Inherit overflow checks for sum and product][36372]
2934 * [Add missing Eq implementations][36423]
2935 * [Implement `Debug` for `DirEntry`][36631]
2936 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2938 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2939 * [Implement more traits for `std::io::ErrorKind`][35911]
2940 * [Optimize BinaryHeap bounds checking][36072]
2941 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2942 `extend_with_element`][36355]
2943 * [Fix overflow checking in unsigned pow()][34942]
2948 * This release includes security fixes to both curl and OpenSSL.
2949 * [Fix transitive doctests when panic=abort][cargo/3021]
2950 * [Add --all-features flag to cargo][cargo/3038]
2951 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2952 * [Don't parse the home directory more than once][cargo/3078]
2953 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2954 * [Update OpenSSL to 1.0.2j][cargo/3121]
2955 * [Add license and license_file to cargo metadata output][cargo/3110]
2956 * [Make crates-io registry URL optional in config; ignore all changes to
2957 source.crates-io][cargo/3089]
2958 * [Don't download dependencies from other platforms][cargo/3123]
2959 * [Build transitive dev-dependencies when needed][cargo/3125]
2960 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2961 * [Avoid updating registry when adding existing deps][cargo/3144]
2962 * [Warn about path overrides that won't work][cargo/3136]
2963 * [Use workspaces during `cargo install`][cargo/3146]
2964 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2965 * [Add --message-format flag][cargo/3000]
2966 * [Pass target environment for rustdoc][cargo/3205]
2967 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2968 * [Update curl and curl-sys][cargo/3241]
2969 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2974 * [rustdoc: Add the `--sysroot` argument][36586]
2975 * [rustdoc: Fix a couple of issues with the search results][35655]
2976 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2977 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2978 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2983 * [Remove unmaintained style guide][35124]
2984 * [Add s390x support][36369]
2985 * [Initial work at Haiku OS support][36727]
2986 * [Add mips-uclibc targets][35734]
2987 * [Crate-ify compiler-rt into compiler-builtins][35021]
2988 * [Add rustc version info (git hash + date) to dist tarball][36213]
2989 * Many documentation improvements
2994 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2995 * [Deny (by default) transmuting from fn item types to pointer-sized
2996 types][34923]. Continuing the long transition to zero-sized fn items,
2998 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3000 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3001 * [Fix lifetime rules for 'if' conditions][36029].
3002 * [Inherit overflow checks for sum and product][36372].
3003 * [Forbid user-defined macros named "macro_rules"][36730].
3005 [33922]: https://github.com/rust-lang/rust/pull/33922
3006 [34623]: https://github.com/rust-lang/rust/pull/34623
3007 [34923]: https://github.com/rust-lang/rust/pull/34923
3008 [34942]: https://github.com/rust-lang/rust/pull/34942
3009 [34982]: https://github.com/rust-lang/rust/pull/34982
3010 [35021]: https://github.com/rust-lang/rust/pull/35021
3011 [35048]: https://github.com/rust-lang/rust/pull/35048
3012 [35074]: https://github.com/rust-lang/rust/pull/35074
3013 [35124]: https://github.com/rust-lang/rust/pull/35124
3014 [35234]: https://github.com/rust-lang/rust/pull/35234
3015 [35238]: https://github.com/rust-lang/rust/pull/35238
3016 [35354]: https://github.com/rust-lang/rust/pull/35354
3017 [35559]: https://github.com/rust-lang/rust/pull/35559
3018 [35585]: https://github.com/rust-lang/rust/pull/35585
3019 [35627]: https://github.com/rust-lang/rust/pull/35627
3020 [35655]: https://github.com/rust-lang/rust/pull/35655
3021 [35702]: https://github.com/rust-lang/rust/pull/35702
3022 [35707]: https://github.com/rust-lang/rust/pull/35707
3023 [35728]: https://github.com/rust-lang/rust/pull/35728
3024 [35734]: https://github.com/rust-lang/rust/pull/35734
3025 [35755]: https://github.com/rust-lang/rust/pull/35755
3026 [35761]: https://github.com/rust-lang/rust/pull/35761
3027 [35764]: https://github.com/rust-lang/rust/pull/35764
3028 [35814]: https://github.com/rust-lang/rust/pull/35814
3029 [35854]: https://github.com/rust-lang/rust/pull/35854
3030 [35871]: https://github.com/rust-lang/rust/pull/35871
3031 [35884]: https://github.com/rust-lang/rust/pull/35884
3032 [35911]: https://github.com/rust-lang/rust/pull/35911
3033 [35969]: https://github.com/rust-lang/rust/pull/35969
3034 [35975]: https://github.com/rust-lang/rust/pull/35975
3035 [36004]: https://github.com/rust-lang/rust/pull/36004
3036 [36008]: https://github.com/rust-lang/rust/pull/36008
3037 [36014]: https://github.com/rust-lang/rust/pull/36014
3038 [36029]: https://github.com/rust-lang/rust/pull/36029
3039 [36059]: https://github.com/rust-lang/rust/pull/36059
3040 [36072]: https://github.com/rust-lang/rust/pull/36072
3041 [36101]: https://github.com/rust-lang/rust/pull/36101
3042 [36104]: https://github.com/rust-lang/rust/pull/36104
3043 [36171]: https://github.com/rust-lang/rust/pull/36171
3044 [36173]: https://github.com/rust-lang/rust/pull/36173
3045 [36178]: https://github.com/rust-lang/rust/pull/36178
3046 [36213]: https://github.com/rust-lang/rust/pull/36213
3047 [36214]: https://github.com/rust-lang/rust/pull/36214
3048 [36264]: https://github.com/rust-lang/rust/pull/36264
3049 [36266]: https://github.com/rust-lang/rust/pull/36266
3050 [36289]: https://github.com/rust-lang/rust/pull/36289
3051 [36338]: https://github.com/rust-lang/rust/pull/36338
3052 [36351]: https://github.com/rust-lang/rust/pull/36351
3053 [36355]: https://github.com/rust-lang/rust/pull/36355
3054 [36369]: https://github.com/rust-lang/rust/pull/36369
3055 [36372]: https://github.com/rust-lang/rust/pull/36372
3056 [36423]: https://github.com/rust-lang/rust/pull/36423
3057 [36482]: https://github.com/rust-lang/rust/pull/36482
3058 [36505]: https://github.com/rust-lang/rust/pull/36505
3059 [36524]: https://github.com/rust-lang/rust/pull/36524
3060 [36527]: https://github.com/rust-lang/rust/pull/36527
3061 [36551]: https://github.com/rust-lang/rust/pull/36551
3062 [36574]: https://github.com/rust-lang/rust/pull/36574
3063 [36586]: https://github.com/rust-lang/rust/pull/36586
3064 [36592]: https://github.com/rust-lang/rust/pull/36592
3065 [36631]: https://github.com/rust-lang/rust/pull/36631
3066 [36639]: https://github.com/rust-lang/rust/pull/36639
3067 [36721]: https://github.com/rust-lang/rust/pull/36721
3068 [36727]: https://github.com/rust-lang/rust/pull/36727
3069 [36730]: https://github.com/rust-lang/rust/pull/36730
3070 [36734]: https://github.com/rust-lang/rust/pull/36734
3071 [36754]: https://github.com/rust-lang/rust/pull/36754
3072 [36995]: https://github.com/rust-lang/rust/pull/36995
3073 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
3074 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
3075 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3076 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
3077 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
3078 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
3079 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
3080 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
3081 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
3082 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
3083 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
3084 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
3085 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
3086 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
3087 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
3088 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3089 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3090 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3091 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3092 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3093 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3094 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3095 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3096 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3097 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3098 [rustup]: https://www.rustup.rs
3099 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3100 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3101 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3102 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3103 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3104 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3105 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3108 Version 1.12.1 (2016-10-20)
3109 ===========================
3114 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3115 * [Confusion with double negation and booleans][36856]
3116 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3117 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3118 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3119 * [Corrupted memory after updated to 1.12][36936]
3120 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3121 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3122 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3124 [36381]: https://github.com/rust-lang/rust/issues/36381
3125 [36856]: https://github.com/rust-lang/rust/issues/36856
3126 [36875]: https://github.com/rust-lang/rust/issues/36875
3127 [36924]: https://github.com/rust-lang/rust/issues/36924
3128 [36926]: https://github.com/rust-lang/rust/issues/36926
3129 [36936]: https://github.com/rust-lang/rust/issues/36936
3130 [37026]: https://github.com/rust-lang/rust/issues/37026
3131 [37112]: https://github.com/rust-lang/rust/issues/37112
3132 [37153]: https://github.com/rust-lang/rust/issues/37153
3135 Version 1.12.0 (2016-09-29)
3136 ===========================
3141 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3142 This translation pass is far simpler than the previous AST->LLVM pass, and
3143 creates opportunities to perform new optimizations directly on the MIR. It
3144 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3145 * [`rustc` presents a new, more readable error format, along with
3146 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3147 Most common editors supporting Rust have been updated to work with it. It was
3148 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3153 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3154 This translation pass is far simpler than the previous AST->LLVM pass, and
3155 creates opportunities to perform new optimizations directly on the MIR. It
3156 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3157 * [Print the Rust target name, not the LLVM target name, with
3158 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3159 * [The computation of `TypeId` is correct in some cases where it was previously
3160 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3161 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3162 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3163 `--print relocation-models`, and `--print code-models` print the available
3164 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3165 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3166 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3167 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3168 These targets produce statically-linked binaries. There are no binary release
3174 * [`rustc` presents a new, more readable error format, along with
3175 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3176 Most common editors supporting Rust have been updated to work with it. It was
3177 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3178 * [In error descriptions, references are now described in plain English,
3179 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3180 * [In error type descriptions, unknown numeric types are named `{integer}` or
3181 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3182 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3187 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3188 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3189 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3190 useful](https://github.com/rust-lang/rust/pull/34908)
3191 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3192 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3193 * [Semicolons are properly required as statement delimiters inside
3194 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3195 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3200 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3201 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3202 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3203 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3204 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3205 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3206 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3207 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3208 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3209 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3210 Both on Unix and Windows.
3211 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3212 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3213 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3214 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3215 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3216 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3217 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3218 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3223 * [The `format!` macro and friends now allow a single argument to be formatted
3224 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3225 * [The lifetime bounds on `[T]::binary_search_by` and
3226 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3227 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3228 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3229 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3230 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3231 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3232 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3233 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3234 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3235 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3236 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3237 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3238 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3239 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3240 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3241 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3242 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3243 * [`mpsc::sync_channel` `Receiver`s return any available message before
3244 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3245 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3246 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3251 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3252 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3253 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3254 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3255 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3256 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3257 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3258 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3259 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3260 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3261 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3262 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3263 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3264 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3265 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3266 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3271 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3272 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3277 * [Test binaries now support a `--test-threads` argument to specify the number
3278 of threads used to run tests, and which acts the same as the
3279 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3280 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3281 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3282 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3283 * [Rust releases now come with source packages that can be installed by rustup
3284 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3285 The resulting source code can be used by tools and IDES, located in the
3286 sysroot under `lib/rustlib/src`.
3291 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3292 * Many minor improvements to the documentation.
3293 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3298 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3299 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3300 * [When formatting strings, if "precision" is specified, the "fill",
3301 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3302 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3305 Version 1.11.0 (2016-08-18)
3306 ===========================
3311 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3312 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3313 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3314 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3315 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3320 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3321 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3322 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3323 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3324 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3325 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3326 (in libcore - previously stabilized in libstd)
3327 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3328 (in libcore - previously stabilized in libstd)
3329 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3330 (in libcore - previously stabilized in libstd)
3331 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3332 (in libcore - previously stabilized in libstd)
3333 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3334 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3335 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3336 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3341 * [The `thread_local!` macro supports multiple definitions in a single
3342 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3343 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3344 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3345 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3346 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3347 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3348 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3349 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3354 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3355 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3356 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3357 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3358 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3359 and `-vv` prints warnings for all crates.
3360 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3361 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3362 This provides room for expansion by arbitrary tools.
3363 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3364 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3365 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3366 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3367 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3368 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3369 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3374 * [Caching projections speeds up type check dramatically for some
3375 workloads](https://github.com/rust-lang/rust/pull/33816)
3376 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3377 This hasher is faster, but is believed to provide sufficient
3378 protection from collision attacks.
3379 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3384 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3385 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3386 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3387 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3388 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3393 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3394 * [When emitting debug info, rustc emits frame pointers for closures,
3395 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3396 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3397 * Many more errors have been given error codes and extended
3399 * API documentation continues to be improved, with many new examples
3404 * [rustc no longer hangs when dependencies recursively re-export
3405 submodules](https://github.com/rust-lang/rust/pull/34542)
3406 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3407 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3408 rewritten](https://github.com/rust-lang/rust/pull/33895)
3409 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3410 No targets use this yet, but it works toward AVR support.
3415 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3416 * [The new follow-set rules that place restrictions on `macro_rules!`
3417 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3418 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3419 and has been a warning since 1.10.
3420 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3421 This causes breakage in some corner cases.
3424 Version 1.10.0 (2016-07-07)
3425 ===========================
3430 * [Allow `concat_idents!` in type positions as well as in expression
3431 positions](https://github.com/rust-lang/rust/pull/33735).
3432 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3433 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3434 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3435 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3436 * [`panic!` can be converted to a runtime abort with the
3437 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3438 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3439 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3440 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3441 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3442 Note that Cargo does not yet directly support cdylibs.
3447 * `os::windows::fs::OpenOptionsExt::access_mode`
3448 * `os::windows::fs::OpenOptionsExt::share_mode`
3449 * `os::windows::fs::OpenOptionsExt::custom_flags`
3450 * `os::windows::fs::OpenOptionsExt::attributes`
3451 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3452 * `os::unix::fs::OpenOptionsExt::custom_flags`
3453 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3454 * `Default for sync::Weak`
3455 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3456 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3457 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3458 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3459 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3460 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3461 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3462 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3463 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3464 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3465 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3466 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3467 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3468 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3469 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3470 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3471 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3472 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3473 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3474 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3475 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3476 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3477 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3478 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3479 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3480 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3481 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3482 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3483 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3484 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3485 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3486 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3487 * Read/Write/RawFd impls for `UnixStream`
3488 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3489 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3490 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3491 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3492 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3493 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3494 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3495 * RawFd impls for `UnixListener`
3496 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3497 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3498 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3499 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3500 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3501 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3502 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3503 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3504 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3505 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3506 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3507 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3508 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3509 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3510 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3511 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3512 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3513 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3514 * RawFd impls for `UnixDatagram`
3515 * `{BTree,Hash}Map::values_mut`
3516 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3521 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3522 The semantics of this minor method are subtle and probably not what
3524 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3525 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3526 will fall back to `/dev/urandom` temporarily to avoid blocking
3527 during early boot](https://github.com/rust-lang/rust/pull/33086).
3528 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3529 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3530 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3531 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3532 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3533 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3534 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3538 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3539 This controls the runtime behavior of the `panic!` macro
3540 and can be either "unwind" (the default), or "abort".
3541 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3542 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3543 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3544 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3545 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3546 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3547 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3548 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3549 By default they are retried twice, which can be customized with the
3550 `net.retry` value in `.cargo/config`.
3551 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3552 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3553 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3554 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3555 Makes it possible to install multiple crates in parallel.
3556 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3557 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3558 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3559 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3560 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3561 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3566 * [rustc memory usage was reduced by refactoring the context used for
3567 type checking](https://github.com/rust-lang/rust/pull/33425).
3568 * [Speed up creation of `HashMap`s by caching the random keys used
3569 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3570 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3571 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3572 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3573 10x faster than the previous lookup tables.
3574 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3579 * Many incremental improvements to documentation and rustdoc.
3580 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3581 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3582 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3583 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3584 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3585 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3586 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3591 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3592 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3593 * [`std` no longer prints backtraces on platforms where the running
3594 module must be loaded with `env::current_exe`, which can't be relied
3595 on](https://github.com/rust-lang/rust/pull/33554).
3596 * This release includes std binaries for the i586-unknown-linux-gnu,
3597 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3598 i586 target is for old x86 hardware without SSE2, and the armv7
3599 target is for Android running on modern ARM architectures.
3600 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3601 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3602 * [On Unix the runtime aborts by calling `libc::abort` instead of
3603 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3604 * [Rust is now bootstrapped from the previous release of Rust,
3605 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3610 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3611 * [`target_env` for Linux ARM targets is just `gnu`, not
3612 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3613 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3614 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3615 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3616 Affects how macros are parsed.
3617 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3618 * [Feature-gated attributes on macro-generated macro invocations are
3619 now rejected](https://github.com/rust-lang/rust/pull/32791).
3620 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3621 This caused some minor changes to type inference.
3624 Version 1.9.0 (2016-05-26)
3625 ==========================
3630 * The `#[deprecated]` attribute when applied to an API will generate
3631 warnings when used. The warnings may be suppressed with
3632 `#[allow(deprecated)]`. [RFC 1270].
3633 * [`fn` item types are zero sized, and each `fn` names a unique
3634 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3635 `transmute` on a `fn` type will generate a warning for a few cycles,
3636 then will be converted to an error.
3637 * [Field and method resolution understand visibility, so private
3638 fields and methods cannot prevent the proper use of public fields
3639 and methods][1.9fv].
3640 * [The parser considers unicode codepoints in the
3641 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3647 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3648 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3649 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3650 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3651 * [`str::is_char_boundary`]
3652 * [`<*const T>::as_ref`]
3653 * [`<*mut T>::as_ref`]
3654 * [`<*mut T>::as_mut`]
3655 * [`AsciiExt::make_ascii_uppercase`]
3656 * [`AsciiExt::make_ascii_lowercase`]
3657 * [`char::decode_utf16`]
3658 * [`char::DecodeUtf16`]
3659 * [`char::DecodeUtf16Error`]
3660 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3661 * [`BTreeSet::take`]
3662 * [`BTreeSet::replace`]
3665 * [`HashSet::replace`]
3667 * [`OsString::with_capacity`]
3668 * [`OsString::clear`]
3669 * [`OsString::capacity`]
3670 * [`OsString::reserve`]
3671 * [`OsString::reserve_exact`]
3672 * [`OsStr::is_empty`]
3674 * [`std::os::unix::thread`]
3677 * [`JoinHandleExt::as_pthread_t`]
3678 * [`JoinHandleExt::into_pthread_t`]
3679 * [`HashSet::hasher`]
3680 * [`HashMap::hasher`]
3681 * [`CommandExt::exec`]
3682 * [`File::try_clone`]
3683 * [`SocketAddr::set_ip`]
3684 * [`SocketAddr::set_port`]
3685 * [`SocketAddrV4::set_ip`]
3686 * [`SocketAddrV4::set_port`]
3687 * [`SocketAddrV6::set_ip`]
3688 * [`SocketAddrV6::set_port`]
3689 * [`SocketAddrV6::set_flowinfo`]
3690 * [`SocketAddrV6::set_scope_id`]
3691 * [`slice::copy_from_slice`]
3692 * [`ptr::read_volatile`]
3693 * [`ptr::write_volatile`]
3694 * [`OpenOptions::create_new`]
3695 * [`TcpStream::set_nodelay`]
3696 * [`TcpStream::nodelay`]
3697 * [`TcpStream::set_ttl`]
3698 * [`TcpStream::ttl`]
3699 * [`TcpStream::set_only_v6`]
3700 * [`TcpStream::only_v6`]
3701 * [`TcpStream::take_error`]
3702 * [`TcpStream::set_nonblocking`]
3703 * [`TcpListener::set_ttl`]
3704 * [`TcpListener::ttl`]
3705 * [`TcpListener::set_only_v6`]
3706 * [`TcpListener::only_v6`]
3707 * [`TcpListener::take_error`]
3708 * [`TcpListener::set_nonblocking`]
3709 * [`UdpSocket::set_broadcast`]
3710 * [`UdpSocket::broadcast`]
3711 * [`UdpSocket::set_multicast_loop_v4`]
3712 * [`UdpSocket::multicast_loop_v4`]
3713 * [`UdpSocket::set_multicast_ttl_v4`]
3714 * [`UdpSocket::multicast_ttl_v4`]
3715 * [`UdpSocket::set_multicast_loop_v6`]
3716 * [`UdpSocket::multicast_loop_v6`]
3717 * [`UdpSocket::set_multicast_ttl_v6`]
3718 * [`UdpSocket::multicast_ttl_v6`]
3719 * [`UdpSocket::set_ttl`]
3720 * [`UdpSocket::ttl`]
3721 * [`UdpSocket::set_only_v6`]
3722 * [`UdpSocket::only_v6`]
3723 * [`UdpSocket::join_multicast_v4`]
3724 * [`UdpSocket::join_multicast_v6`]
3725 * [`UdpSocket::leave_multicast_v4`]
3726 * [`UdpSocket::leave_multicast_v6`]
3727 * [`UdpSocket::take_error`]
3728 * [`UdpSocket::connect`]
3729 * [`UdpSocket::send`]
3730 * [`UdpSocket::recv`]
3731 * [`UdpSocket::set_nonblocking`]
3736 * [`std::sync::Once` is poisoned if its initialization function
3738 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3739 * [Most types implement `fmt::Debug`][1.9db].
3740 * [The default buffer size used by `BufReader` and `BufWriter` was
3741 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3742 used by other languages.
3743 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3744 `Duration` additionally implements `*=` and `/=`][1.9ta].
3745 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3746 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3747 * [`Chain` implements `BufRead`][1.9ch].
3748 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3753 * [Cargo can now run concurrently][1.9cc].
3754 * [Top-level overrides allow specific revisions of crates to be
3755 overridden through the entire crate graph][1.9ct]. This is intended
3756 to make upgrades easier for large projects, by allowing crates to be
3757 forked temporarily until they've been upgraded and republished.
3758 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3759 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3760 on the commandline][1.9cf]. `rustc` arguments can also be specified
3761 in the `build.rustflags` configuration key.
3766 * [The time complexity of comparing variables for equivalence during type
3767 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3768 to major compilation time improvement in some scenarios.
3769 * [`ToString` is specialized for `str`, giving it the same performance
3770 as `to_owned`][1.9ts].
3771 * [Spawning processes with `Command::output` no longer creates extra
3773 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3774 for C-like enums][1.9cl].
3779 * [Passing the `--quiet` flag to a test runner will produce
3780 much-abbreviated output][1.9q].
3781 * The Rust Project now publishes std binaries for the
3782 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3783 `i586-pc-windows-msvc` targets.
3788 * [`std::sync::Once` is poisoned if its initialization function
3790 * [It is illegal to define methods with the same name in overlapping
3791 inherent `impl` blocks][1.9sn].
3792 * [`fn` item types are zero sized, and each `fn` names a unique
3793 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3794 `transmute` on a `fn` type will generate a warning for a few cycles,
3795 then will be converted to an error.
3796 * [Improvements to const evaluation may trigger new errors when integer
3797 literals are out of range][1.9ce].
3800 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3801 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3802 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3803 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3804 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3805 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3806 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3807 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3808 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3809 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3810 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3811 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3812 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3813 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3814 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3815 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3816 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3817 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3818 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3819 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3820 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3821 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3822 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3823 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3824 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3825 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3826 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3827 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3828 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3829 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3830 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3831 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3832 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3833 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3834 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3835 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3836 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3837 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3838 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3839 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3840 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3841 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3842 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3843 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3844 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3845 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3846 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3847 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3848 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3849 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3850 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3851 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3852 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3853 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3854 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3855 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3856 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3857 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3858 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3859 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3860 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3861 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3862 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3863 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3864 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3865 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3866 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3867 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3868 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3869 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3870 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3871 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3872 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3873 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3874 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3875 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3876 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3877 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3878 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3879 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3880 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3881 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3882 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3883 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3884 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3885 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3886 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3887 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3888 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3889 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3890 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3891 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3892 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3893 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3894 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3895 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3896 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3897 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3898 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3899 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3900 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3901 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3902 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3903 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3904 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3905 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3906 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3907 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3908 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3909 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3912 Version 1.8.0 (2016-04-14)
3913 ==========================
3918 * Rust supports overloading of compound assignment statements like
3919 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3920 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3921 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3923 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3924 addition to the non-braced form, `struct Foo;`. [RFC 218].
3930 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3931 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3934 * [`ptr::drop_in_place`]
3936 * [`time::SystemTime`]
3938 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3939 * [`Instant::elapsed`]
3940 * [`SystemTime::now`]
3941 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3942 * [`SystemTime::elapsed`]
3943 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3944 * [`SystemTimeError`]
3945 * [`SystemTimeError::duration`]
3946 * Various impls for `SystemTimeError`
3948 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3949 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3950 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3951 * [The `write!` and `writeln!` macros correctly emit errors if any of
3952 their arguments can't be formatted][1.8w].
3953 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3954 * [The Unix-specific `raw` modules, which contain a number of
3955 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3956 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3957 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3958 across platforms was making it difficult to implement `std`
3959 correctly. Those that need these definitions should use the `libc`
3961 * The Unix-specific `MetadataExt` traits, including
3962 `os::unix::fs::MetadataExt`, which expose values such as inode
3963 numbers [no longer return platform-specific types][1.8r], but
3964 instead return widened integers. [RFC 1415].
3965 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3966 * [Atomic loads and stores are not volatile][1.8a].
3967 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3972 * [Inlining hash functions lead to a 3% compile-time improvement in
3973 some workloads][1.8h].
3974 * When using jemalloc, its symbols are [unprefixed so that it
3975 overrides the libc malloc implementation][1.8h]. This means that for
3976 rustc, LLVM is now using jemalloc, which results in a 6%
3977 compile-time improvement on a specific workload.
3978 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3983 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3984 i686-pc-windows-msvc is now considered a tier-1 platform.
3985 * [The `--print targets` flag prints a list of supported targets][1.8t].
3986 * [The `--print cfg` flag prints the `cfg`s defined for the current
3988 * [`rustc` can be built with an new Cargo-based build system, written
3989 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3990 build system. To enable it configure with `configure --rustbuild`.
3991 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3992 variants while also indicating the total number of missing variants
3993 if more than 3][1.8m].
3994 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3995 * The Rust Project now publishes binary releases of the standard
3996 library for a number of tier-2 targets:
3997 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3998 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3999 `x86_64-rumprun-netbsd`. These can be installed with
4000 tools such as [multirust][1.8mr].
4005 * [`cargo init` creates a new Cargo project in the current
4006 directory][1.8ci]. It is otherwise like `cargo new`.
4007 * [Cargo has configuration keys for `-v` and
4008 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4009 `[term]` section of `.cargo/config`.
4010 * [Configuration keys that evaluate to strings or integers can be set
4011 via environment variables][1.8ce]. For example the `build.jobs` key
4012 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4013 precedence over config files.
4014 * [Target-specific dependencies support Rust `cfg` syntax for
4015 describing targets][1.8cfg] so that dependencies for multiple
4016 targets can be specified together. [RFC 1361].
4017 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4018 `RUSTDOC` take precedence over the `build.target-dir`,
4019 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4020 * [The child process tree is killed on Windows when Cargo is
4022 * [The `build.target` configuration value sets the target platform,
4023 like `--target`][1.8ct].
4028 * [Unstable compiler flags have been further restricted][1.8u]. Since
4029 1.0 `-Z` flags have been considered unstable, and other flags that
4030 were considered unstable additionally required passing `-Z
4031 unstable-options` to access. Unlike unstable language and library
4032 features though, these options have been accessible on the stable
4033 release channel. Going forward, *new unstable flags will not be
4034 available on the stable release channel*, and old unstable flags
4035 will warn about their usage. In the future, all unstable flags will
4036 be unavailable on the stable release channel.
4037 * [It is no longer possible to `match` on empty enum variants using
4038 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4039 * The Unix-specific `MetadataExt` traits, including
4040 `os::unix::fs::MetadataExt`, which expose values such as inode
4041 numbers [no longer return platform-specific types][1.8r], but
4042 instead return widened integers. [RFC 1415].
4043 * [Modules sourced from the filesystem cannot appear within arbitrary
4044 blocks, but only within other modules][1.8mf].
4045 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4046 * On Unix, [stack overflow triggers a runtime abort instead of a
4048 * [`Command::spawn` and its equivalents return an error if any of
4049 its command-line arguments contain interior `NUL`s][1.8n].
4050 * [Tuple and unit enum variants from other crates are in the type
4052 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4053 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4054 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4055 instead of `foo.lib`.
4058 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4059 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4060 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4061 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4062 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4063 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
4064 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
4065 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
4066 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
4067 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
4068 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
4069 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
4070 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
4071 [1.8h]: https://github.com/rust-lang/rust/pull/31460
4072 [1.8l]: https://github.com/rust-lang/rust/pull/31668
4073 [1.8m]: https://github.com/rust-lang/rust/pull/31020
4074 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
4075 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
4076 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
4077 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
4078 [1.8n]: https://github.com/rust-lang/rust/pull/31056
4079 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
4080 [1.8r]: https://github.com/rust-lang/rust/pull/31551
4081 [1.8so]: https://github.com/rust-lang/rust/pull/31333
4082 [1.8st]: https://github.com/rust-lang/rust/pull/29520
4083 [1.8t]: https://github.com/rust-lang/rust/pull/31358
4084 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
4085 [1.8u]: https://github.com/rust-lang/rust/pull/31793
4086 [1.8v]: https://github.com/rust-lang/rust/pull/31757
4087 [1.8w]: https://github.com/rust-lang/rust/pull/31904
4088 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4089 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4090 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4091 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4092 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4093 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4094 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4095 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4096 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4097 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4098 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4099 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4100 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4101 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4102 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4103 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4104 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4105 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4106 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4107 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4108 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4109 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4110 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4111 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4112 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4113 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4114 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4115 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4116 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4117 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4120 Version 1.7.0 (2016-03-03)
4121 ==========================
4128 * [`Path::strip_prefix`][] (renamed from relative_from)
4129 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4131 * [`Ipv4Addr::is_loopback`]
4132 * [`Ipv4Addr::is_private`]
4133 * [`Ipv4Addr::is_link_local`]
4134 * [`Ipv4Addr::is_multicast`]
4135 * [`Ipv4Addr::is_broadcast`]
4136 * [`Ipv4Addr::is_documentation`]
4138 * [`Ipv6Addr::is_unspecified`]
4139 * [`Ipv6Addr::is_loopback`]
4140 * [`Ipv6Addr::is_multicast`]
4143 * [`Vec::as_mut_slice`]
4145 * [`String::as_str`]
4146 * [`String::as_mut_str`]
4148 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4150 * `<[T]>::`[`sort_by_key`]
4151 * checked, saturated, and overflowing operations
4152 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4153 * [`i32::saturating_mul`]
4154 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4155 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4156 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4157 * [`u32::saturating_mul`]
4158 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4159 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4160 * and checked, saturated, and overflowing operations for other primitive types
4162 * [`ffi::IntoStringError`]
4163 * [`CString::into_string`]
4164 * [`CString::into_bytes`]
4165 * [`CString::into_bytes_with_nul`]
4166 * `From<CString> for Vec<u8>`
4168 * [`IntoStringError::into_cstring`]
4169 * [`IntoStringError::utf8_error`]
4170 * `Error for IntoStringError`
4172 * [`std::hash::BuildHasher`]
4173 * [`BuildHasher::Hasher`]
4174 * [`BuildHasher::build_hasher`]
4175 * [`std::hash::BuildHasherDefault`]
4176 * [`HashMap::with_hasher`]
4177 * [`HashMap::with_capacity_and_hasher`]
4178 * [`HashSet::with_hasher`]
4179 * [`HashSet::with_capacity_and_hasher`]
4180 * [`std::collections::hash_map::RandomState`]
4181 * [`RandomState::new`]
4182 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4183 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4184 from bytes is faster.
4185 * [The performance of `LineWriter` (and thus `io::stdout`) was
4186 improved by using `memchr` to search for newlines][1.7m].
4187 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4188 `f64` variants were stabilized previously.
4189 * [`BTreeMap` was rewritten to use less memory and improve the performance
4190 of insertion and iteration, the latter by as much as 5x][1.7bm].
4191 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4192 covariant over their contained type][1.7bt].
4193 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4194 over their contained type][1.7ll].
4195 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4197 * [`Any` is implemented for unsized types][1.7a].
4198 * [`Hash` is implemented for `Duration`][1.7h].
4203 * [When running tests with `--test`, rustdoc will pass `--cfg`
4204 arguments to the compiler][1.7dt].
4205 * [The compiler is built with RPATH information by default][1.7rpa].
4206 This means that it will be possible to run `rustc` when installed in
4207 unusual configurations without configuring the dynamic linker search
4209 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4210 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4211 over `LD_LIBRARY_PATH`.
4216 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4217 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4218 * [The `rerun-if-changed` build script directive no longer causes the
4219 build script to incorrectly run twice in certain scenarios][1.7rr].
4224 * Soundness fixes to the interactions between associated types and
4225 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4226 code that violates the new rules. This is a significant change that
4227 is known to break existing code, so it has emitted warnings for the
4228 new error cases since 1.4 to give crate authors time to adapt. The
4229 details of what is changing are subtle; read the RFC for more.
4230 * [Several bugs in the compiler's visibility calculations were
4231 fixed][1.7v]. Since this was found to break significant amounts of
4232 code, the new errors will be emitted as warnings for several release
4233 cycles, under the `private_in_public` lint.
4234 * Defaulted type parameters were accidentally accepted in positions
4235 that were not intended. In this release, [defaulted type parameters
4236 appearing outside of type definitions will generate a
4237 warning][1.7d], which will become an error in future releases.
4238 * [Parsing "." as a float results in an error instead of 0][1.7p].
4239 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4240 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4242 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4243 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4244 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4245 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4246 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4247 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4248 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4249 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4250 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4251 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4252 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4253 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4254 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4255 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4256 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4257 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4258 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4259 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4260 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4261 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4262 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4263 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4264 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4265 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4266 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4267 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4268 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4269 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4270 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4271 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4272 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4273 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4274 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4275 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4276 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4277 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4278 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4279 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4280 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4281 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4282 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4283 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4284 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4285 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4286 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4287 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4288 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4289 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4290 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4291 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4292 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4293 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4294 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4295 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4296 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4297 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4298 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4299 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4300 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4301 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4302 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4303 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4304 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4305 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4306 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4307 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4308 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4309 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4310 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4311 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4312 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4313 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4314 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4315 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4316 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4317 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4318 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4319 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4320 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4323 Version 1.6.0 (2016-01-21)
4324 ==========================
4329 * The `#![no_std]` attribute causes a crate to not be linked to the
4330 standard library, but only the [core library][1.6co], as described
4331 in [RFC 1184]. The core library defines common types and traits but
4332 has no platform dependencies whatsoever, and is the basis for Rust
4333 software in environments that cannot support a full port of the
4334 standard library, such as operating systems. Most of the core
4335 library is now stable.
4341 [`Read::read_exact`],
4342 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4343 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4344 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4345 [`os::unix::fs::DirBuilderExt`],
4346 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4347 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4348 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4349 [`collections::hash_map::Drain`],
4350 [`collections::hash_map::HashMap::drain`],
4351 [`collections::hash_set::Drain`],
4352 [`collections::hash_set::HashSet::drain`],
4353 [`collections::binary_heap::Drain`],
4354 [`collections::binary_heap::BinaryHeap::drain`],
4355 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4356 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4357 [`RwLock::into_inner`],
4358 [`Iterator::min_by_key`][] (renamed from `min_by`),
4359 [`Iterator::max_by_key`][] (renamed from `max_by`).
4360 * The [core library][1.6co] is stable, as are most of its APIs.
4361 * [The `assert_eq!` macro supports arguments that don't implement
4362 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4364 * Several timer functions that take duration in milliseconds [are
4365 deprecated in favor of those that take `Duration`][1.6ms]. These
4366 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4367 `thread::park_timeout_ms`.
4368 * The algorithm by which `Vec` reserves additional elements was
4369 [tweaked to not allocate excessive space][1.6a] while still growing
4371 * `From` conversions are [implemented from integers to floats][1.6f]
4372 in cases where the conversion is lossless. Thus they are not
4373 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4374 or `f64`. They are also not implemented for `isize` and `usize`
4375 because the implementations would be platform-specific. `From` is
4376 also implemented from `f32` to `f64`.
4377 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4378 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4379 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4380 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4382 * Sorting slices that are already sorted [is 50% faster in some
4388 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4389 * Cargo build scripts can specify their dependencies by emitting the
4390 [`rerun-if-changed`][1.6rr] key.
4391 * crates.io will reject publication of crates with dependencies that
4392 have a wildcard version constraint. Crates with wildcard
4393 dependencies were seen to cause a variety of problems, as described
4394 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4396 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4397 release folder. A variety of artifacts that Cargo failed to clean
4398 are now correctly deleted.
4403 * The `unreachable_code` lint [warns when a function call's argument
4405 * The parser indicates [failures that may be caused by
4406 confusingly-similar Unicode characters][1.6uc]
4407 * Certain macro errors [are reported at definition time][1.6m], not
4413 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4414 environment variable when locating crates. This was a pre-cargo
4415 feature for integrating with the package manager that was
4416 accidentally never removed.
4417 * [A number of bugs were fixed in the privacy checker][1.6p] that
4418 could cause previously-accepted code to break.
4419 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4420 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4421 struct pattern syntax (`Foo(..)`) can no longer be used to match
4422 unit structs. This is a warning now, but will become an error in
4423 future releases. Patterns that share the same name as a const are
4425 * A bug was fixed that causes [rustc not to apply default type
4426 parameters][1.6xc] when resolving certain method implementations of
4427 traits defined in other crates.
4429 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4430 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4431 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4432 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4433 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4434 [1.6co]: http://doc.rust-lang.org/core/index.html
4435 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4436 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4437 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4438 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4439 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4440 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4441 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4442 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4443 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4444 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4445 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4446 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4447 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4448 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4449 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4450 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4451 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4452 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4453 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4454 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4455 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4456 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4457 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4458 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4459 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4460 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4461 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4462 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4463 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4464 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4465 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4466 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4467 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4468 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4469 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4470 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4471 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4472 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4473 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4474 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4475 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4478 Version 1.5.0 (2015-12-10)
4479 ==========================
4481 * ~700 changes, numerous bugfixes
4487 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4488 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4489 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4490 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4491 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4492 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4493 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4494 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4495 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4496 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4497 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4498 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4499 [`Path::read_link`], [`Path::symlink_metadata`],
4500 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4501 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4502 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4503 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4504 [`slice::split_first_mut`], [`slice::split_first`],
4505 [`slice::split_last_mut`], [`slice::split_last`],
4506 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4507 [`str::MatchIndices`], [`str::RMatchIndices`],
4508 [`str::match_indices`], [`str::rmatch_indices`],
4509 [`str::slice_mut_unchecked`], [`string::ParseError`].
4510 * Rust applications hosted on crates.io can be installed locally to
4511 `~/.cargo/bin` with the [`cargo install`] command. Among other
4512 things this makes it easier to augment Cargo with new subcommands:
4513 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4514 invoked as `cargo foo`.
4515 * Crates with wildcard (`*`) dependencies will [emit warnings when
4516 published][1.5w]. In 1.6 it will no longer be possible to publish
4517 crates with wildcard dependencies.
4522 * The rules determining when a particular lifetime must outlive
4523 a particular value (known as '[dropck]') have been [modified
4524 to not rely on parametricity][1.5p].
4525 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4526 and `Arc`][1.5a]. Because these smart pointer types implement
4527 `Deref`, this causes breakage in cases where the interior type
4528 contains methods of the same name.
4529 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4530 that they could drop their content. Soundness fix.
4531 * All method invocations are [properly checked][1.5wf1] for
4532 [well-formedness][1.5wf2]. Soundness fix.
4533 * Traits whose supertraits contain `Self` are [not object
4534 safe][1.5o]. Soundness fix.
4535 * Target specifications support a [`no_default_libraries`][1.5nd]
4536 setting that controls whether `-nodefaultlibs` is passed to the
4537 linker, and in turn the `is_like_windows` setting no longer affects
4538 the `-nodefaultlibs` flag.
4539 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4540 * The `#[inline]` and `#[repr]` attributes [can only appear
4541 in valid locations][1.5at].
4542 * Native libraries linked from the local crate are [passed to
4543 the linker before native libraries from upstream crates][1.5nl].
4544 * Two rarely-used attributes, `#[no_debug]` and
4545 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4546 * Negation of unsigned integers, which has been a warning for
4547 several releases, [is now behind a feature gate and will
4548 generate errors][1.5nu].
4549 * The parser accidentally accepted visibility modifiers on
4550 enum variants, a bug [which has been fixed][1.5ev].
4551 * [A bug was fixed that allowed `use` statements to import unstable
4557 * When evaluating expressions at compile-time that are not
4558 compile-time constants (const-evaluating expressions in non-const
4559 contexts), incorrect code such as overlong bitshifts and arithmetic
4560 overflow will [generate a warning instead of an error][1.5ce],
4561 delaying the error until runtime. This will allow the
4562 const-evaluator to be expanded in the future backwards-compatibly.
4563 * The `improper_ctypes` lint [no longer warns about using `isize` and
4564 `usize` in FFI][1.5ict].
4569 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4571 * `Default` is [implemented for mutable slices][1.5d].
4572 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4573 * There are now `From` conversions [between floating point
4574 types][1.5f] where the conversions are lossless.
4575 * There are now `From` conversions [between integer types][1.5i] where
4576 the conversions are lossless.
4577 * [`fs::Metadata` implements `Clone`][1.5fs].
4578 * The `parse` method [accepts a leading "+" when parsing
4580 * [`AsMut` is implemented for `Vec`][1.5am].
4581 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4582 been optimized][1.5cf] and no longer rely on the default impl.
4583 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4584 `unsafe extern "C"` function types now [implement `Clone`,
4585 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4586 `fmt::Debug` for up to 12 arguments][1.5fp].
4587 * [Dropping `Vec`s is much faster in unoptimized builds when the
4588 element types don't implement `Drop`][1.5dv].
4589 * A bug that caused in incorrect behavior when [combining `VecDeque`
4590 with zero-sized types][1.5vdz] was resolved.
4591 * [`PartialOrd` for slices is faster][1.5po].
4596 * [Crate metadata size was reduced by 20%][1.5md].
4597 * [Improvements to code generation reduced the size of libcore by 3.3
4598 MB and rustc's memory usage by 18MB][1.5m].
4599 * [Improvements to deref translation increased performance in
4600 unoptimized builds][1.5dr].
4601 * Various errors in trait resolution [are deduplicated to only be
4602 reported once][1.5te].
4603 * Rust has preliminary [support for rumprun kernels][1.5rr].
4604 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4606 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4607 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4608 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4609 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4610 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4611 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4612 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4613 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4614 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4615 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4616 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4617 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4618 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4619 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4620 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4621 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4622 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4623 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4624 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4625 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4626 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4627 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4628 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4629 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4630 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4631 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4632 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4633 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4634 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4635 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4636 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4637 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4638 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4639 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4640 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4641 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4642 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4643 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4644 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4645 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4646 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4647 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4648 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4649 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4650 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4651 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4652 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4653 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4654 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4655 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4656 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4657 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4658 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4659 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4660 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4661 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4662 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4663 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4664 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4665 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4666 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4667 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4668 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4669 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4670 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4671 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4672 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4673 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4674 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4675 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4676 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4677 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4678 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4679 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4680 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4681 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4682 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4683 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4684 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4685 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4686 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4687 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4688 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4689 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4690 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4691 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4692 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4693 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4694 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4696 Version 1.4.0 (2015-10-29)
4697 ==========================
4699 * ~1200 changes, numerous bugfixes
4704 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4705 GNU) are now supported and recommended for use.
4710 * [Several changes have been made to fix type soundness and improve
4711 the behavior of associated types][sound]. See [RFC 1214]. Although
4712 we have mostly introduced these changes as warnings this release, to
4713 become errors next release, there are still some scenarios that will
4714 see immediate breakage.
4715 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4716 line breaks in addition to `\n`][crlf].
4717 * [Loans of `'static` lifetime extend to the end of a function][stat].
4718 * [`str::parse` no longer introduces avoidable rounding error when
4719 parsing floating point numbers. Together with earlier changes to
4720 float formatting/output, "round trips" like f.to_string().parse()
4721 now preserve the value of f exactly. Additionally, leading plus
4722 signs are now accepted][fp3].
4728 * `use` statements that import multiple items [can now rename
4729 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4730 * [Binops work correctly on fat pointers][binfat].
4731 * `pub extern crate`, which does not behave as expected, [issues a
4732 warning][pec] until a better solution is found.
4737 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4738 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4739 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4740 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4741 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4742 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4743 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4744 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4745 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4746 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4747 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4748 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4749 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4750 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4751 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4752 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4753 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4754 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4756 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4757 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4758 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4759 `f64::from_str_radix`.
4760 * [Reverse-searching strings is faster with the 'two-way'
4762 * [`std::io::copy` allows `?Sized` arguments][cc].
4763 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4764 [override `count`, `nth` and `last` with an O(1)
4765 implementation][it].
4766 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4767 * [`IntoRawFd` has been added to the Unix-specific prelude,
4768 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4770 * [`Extend<String>` and `FromIterator<String` are both implemented for
4772 * [`IntoIterator` is implemented for references to `Option` and
4774 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4775 Copy`][ext] as part of [RFC 839]. This will cause type inference
4776 breakage in rare situations.
4777 * [`BinaryHeap` implements `Debug`][bh2].
4778 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4780 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4781 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4782 * [String comparison is faster][faststr].
4783 * `&mut T` where `T: std::fmt::Write` [also implements
4784 `std::fmt::Write`][mutw].
4785 * [A stable regression in `VecDeque::push_back` and other
4786 capacity-altering methods that caused panics for zero-sized types
4788 * [Function pointers implement traits for up to 12 parameters][fp2].
4793 * The compiler [no longer uses the 'morestack' feature to prevent
4794 stack overflow][mm]. Instead it uses guard pages and stack
4795 probes (though stack probes are not yet implemented on any platform
4797 * [The compiler matches traits faster when projections are involved][p].
4798 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4800 * [Cargo now displays useful information about what its doing during
4801 `cargo update`][cu].
4803 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4804 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4805 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4806 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4807 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4808 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4809 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4810 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4811 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4812 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4813 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4814 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4815 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4816 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4817 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4818 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4819 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4820 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4821 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4822 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4823 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4824 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4825 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4826 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4827 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4828 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4829 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4830 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4831 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4832 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4833 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4834 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4835 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4836 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4837 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4838 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4839 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4840 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4841 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4842 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4843 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4844 [bh2]: https://github.com/rust-lang/rust/pull/28156
4845 [binfat]: https://github.com/rust-lang/rust/pull/28270
4846 [bm]: https://github.com/rust-lang/rust/pull/28197
4847 [cc]: https://github.com/rust-lang/rust/pull/27531
4848 [crlf]: https://github.com/rust-lang/rust/pull/28034
4849 [cu]: https://github.com/rust-lang/cargo/pull/1931
4850 [d]: https://github.com/rust-lang/rust/pull/27825
4851 [dep]: https://github.com/rust-lang/rust/pull/28339
4852 [es]: https://github.com/rust-lang/rust/pull/27956
4853 [ext]: https://github.com/rust-lang/rust/pull/28094
4854 [faststr]: https://github.com/rust-lang/rust/pull/28338
4855 [ffi]: https://github.com/rust-lang/rust/pull/28779
4856 [fp]: https://github.com/rust-lang/rust/pull/28268
4857 [fp2]: https://github.com/rust-lang/rust/pull/28560
4858 [fp3]: https://github.com/rust-lang/rust/pull/27307
4859 [i]: https://github.com/rust-lang/rust/pull/27451
4860 [into2]: https://github.com/rust-lang/rust/pull/28039
4861 [it]: https://github.com/rust-lang/rust/pull/27652
4862 [mm]: https://github.com/rust-lang/rust/pull/27338
4863 [mutw]: https://github.com/rust-lang/rust/pull/28368
4864 [sound]: https://github.com/rust-lang/rust/pull/27641
4865 [p]: https://github.com/rust-lang/rust/pull/27866
4866 [pec]: https://github.com/rust-lang/rust/pull/28486
4867 [pr]: https://github.com/rust-lang/rust/pull/27896
4868 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4869 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4870 [s]: https://github.com/rust-lang/rust/pull/27474
4871 [stab]: https://github.com/rust-lang/rust/pull/28339
4872 [stat]: https://github.com/rust-lang/rust/pull/28321
4873 [vd]: https://github.com/rust-lang/rust/pull/28494
4875 Version 1.3.0 (2015-09-17)
4876 ==============================
4878 * ~900 changes, numerous bugfixes
4883 * The [new object lifetime defaults][nold] have been [turned
4884 on][nold2] after a cycle of warnings about the change. Now types
4885 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4886 being interpreted as `&'a Box<Trait+'a>` to `&'a
4887 Box<Trait+'static>`.
4888 * [The Rustonomicon][nom] is a new book in the official documentation
4889 that dives into writing unsafe Rust.
4890 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4891 timekeeping is employed by other std APIs, as well as out-of-tree
4897 * The [new object lifetime defaults][nold] have been [turned
4898 on][nold2] after a cycle of warnings about the change.
4899 * There is a known [regression][lr] in how object lifetime elision is
4900 interpreted, the proper solution for which is undetermined.
4901 * The `#[prelude_import]` attribute, an internal implementation
4902 detail, was accidentally stabilized previously. [It has been put
4903 behind the `prelude_import` feature gate][pi]. This change is
4904 believed to break no existing code.
4905 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4906 [more sane for dynamically sized types][dst3]. Code that relied on
4907 the previous behavior is thought to be broken.
4908 * The `dropck` rules, which checks that destructors can't access
4909 destroyed values, [have been updated][dropck] to match the
4910 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4911 cause some previously-compiling code to no longer build.
4916 * The [new object lifetime defaults][nold] have been [turned
4917 on][nold2] after a cycle of warnings about the change.
4918 * Semicolons may [now follow types and paths in
4919 macros](https://github.com/rust-lang/rust/pull/27000).
4920 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4921 [more sane for dynamically sized types][dst3]. Code that relied on
4922 the previous behavior is not known to exist, and suspected to be
4924 * `'static` variables [may now be recursive][st].
4925 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4926 implementations correctly.
4927 * The `dropck` rules, which checks that destructors can't access
4928 destroyed values, [have been updated][dropck] to match the
4934 * The [`Duration`] API, [has been stabilized][ds], as well as the
4935 `std::time` module, which presently contains only `Duration`.
4936 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4937 * The owned C string, [`CString`], implements [`Borrow`] and the
4938 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4939 these allow C strings to be borrowed and cloned in generic code.
4940 * [`CStr`] implements [`Debug`].
4941 * [`AtomicPtr`] implements [`Debug`].
4942 * [`Error`] trait objects [can be downcast to their concrete types][e]
4943 in many common configurations, using the [`is`], [`downcast`],
4944 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4946 * Searching for substrings now [employs the two-way algorithm][search]
4947 instead of doing a naive search. This gives major speedups to a
4948 number of methods, including [`contains`][sc], [`find`][sf],
4949 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4950 [`ends_with`][sew] are also faster.
4951 * The performance of `PartialEq` for slices is [much faster][ps].
4952 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4953 is overridden and optimized by the implementations for scalars.
4954 * The [`Hasher`] trait now has a number of specialized `write_*`
4955 methods for primitive types, for efficiency.
4956 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4957 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4958 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4959 of [`std::error::Error::cause`][iec] also delegates to the inner
4961 * [`process::Child`][pc] gained the [`id`] method, which returns a
4962 `u32` representing the platform-specific process identifier.
4963 * The [`connect`] method on slices is deprecated, replaced by the new
4964 [`join`] method (note that both of these are on the *unstable*
4965 [`SliceConcatExt`] trait, but through the magic of the prelude are
4966 available to stable code anyway).
4967 * The [`Div`] operator is implemented for [`Wrapping`] types.
4968 * [`DerefMut` is implemented for `String`][dms].
4969 * Performance of SipHash (the default hasher for `HashMap`) is
4970 [better for long data][sh].
4971 * [`AtomicPtr`] implements [`Send`].
4972 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4973 are now [specialized to use uninitialized buffers for increased
4975 * Lifetime parameters of foreign functions [are now resolved
4981 * Rust can now, with some coercion, [produce programs that run on
4982 Windows XP][xp], though XP is not considered a supported platform.
4983 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4984 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4985 recommended for use in 1.3, though should be fully-functional
4986 in the [64-bit 1.4 beta][b14].
4987 * On Fedora-based systems installation will [properly configure the
4988 dynamic linker][fl].
4989 * The compiler gained many new extended error descriptions, which can
4990 be accessed with the `--explain` flag.
4991 * The `dropck` pass, which checks that destructors can't access
4992 destroyed values, [has been rewritten][dropck]. This fixes some
4993 soundness holes, and as such will cause some previously-compiling
4994 code to no longer build.
4995 * `rustc` now uses [LLVM to write archive files where possible][ar].
4996 Eventually this will eliminate the compiler's dependency on the ar
4998 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4999 supported FreeBSD on x86_64).
5000 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5001 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5003 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5004 will kill the process instead of leaking][nlp].
5006 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5007 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5008 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5009 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5010 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5011 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5012 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5013 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5014 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5015 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5016 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5017 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5018 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5019 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5020 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5021 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5022 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5023 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5024 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5025 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5026 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5027 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5028 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5029 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5030 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5031 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5032 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5033 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5034 [ar]: https://github.com/rust-lang/rust/pull/26926
5035 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5036 [dms]: https://github.com/rust-lang/rust/pull/26241
5037 [dropck]: https://github.com/rust-lang/rust/pull/27261
5038 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5039 [ds]: https://github.com/rust-lang/rust/pull/26818
5040 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5041 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5042 [dst3]: https://github.com/rust-lang/rust/pull/27351
5043 [e]: https://github.com/rust-lang/rust/pull/24793
5044 [f]: https://github.com/rust-lang/rust/pull/26588
5045 [fb]: https://github.com/rust-lang/rust/pull/26959
5046 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5047 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5048 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5049 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5050 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5051 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5052 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5053 [lic]: https://github.com/rust-lang/rust/pull/26583
5054 [lnu]: https://github.com/rust-lang/rust/pull/27026
5055 [lr]: https://github.com/rust-lang/rust/issues/27248
5056 [lum]: https://github.com/rust-lang/rust/pull/26378
5057 [lur]: https://github.com/rust-lang/rust/pull/26783
5058 [nlp]: https://github.com/rust-lang/rust/pull/27176
5059 [nold2]: https://github.com/rust-lang/rust/pull/27045
5060 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5061 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5062 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5063 [pi]: https://github.com/rust-lang/rust/pull/26699
5064 [ps]: https://github.com/rust-lang/rust/pull/26884
5065 [rte]: https://github.com/rust-lang/rust/pull/26950
5066 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
5067 [search]: https://github.com/rust-lang/rust/pull/26327
5068 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
5069 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
5070 [sh]: https://github.com/rust-lang/rust/pull/27280
5071 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
5072 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
5073 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
5074 [st]: https://github.com/rust-lang/rust/pull/26630
5075 [win1]: https://github.com/rust-lang/rust/pull/26569
5076 [win2]: https://github.com/rust-lang/rust/pull/26741
5077 [win3]: https://github.com/rust-lang/rust/pull/26741
5078 [win4]: https://github.com/rust-lang/rust/pull/27210
5079 [xp]: https://github.com/rust-lang/rust/pull/26569
5081 Version 1.2.0 (2015-08-07)
5082 ==========================
5084 * ~1200 changes, numerous bugfixes
5089 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5090 like `Rc` to contain types without a fixed size, arrays and trait
5091 objects, finally enabling use of `Rc<[T]>` and completing the
5092 implementation of DST.
5093 * [Parallel codegen][parcodegen] is now working again, which can
5094 substantially speed up large builds in debug mode; It also gets
5095 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5096 jobs). It's not enabled by default, but will be "in the near
5097 future". It can be activated with the `-C codegen-units=N` flag to
5099 * This is the first release with [experimental support for linking
5100 with the MSVC linker and lib C on Windows (instead of using the GNU
5101 variants via MinGW)][win]. It is yet recommended only for the most
5102 intrepid Rustaceans.
5103 * Benchmark compilations are showing a 30% improvement in
5104 bootstrapping over 1.1.
5109 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5110 unicode case mapping, which is a previously-planned change in
5111 behavior and considered a bugfix.
5112 * [`mem::align_of`] now specifies [the *minimum alignment* for
5113 T][align], which is usually the alignment programs are interested
5114 in, and the same value reported by clang's
5115 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5117 * [The `#[packed]` attribute is no longer silently accepted by the
5118 compiler][packed]. This attribute did nothing and code that
5119 mentioned it likely did not work as intended.
5120 * Associated type defaults are [now behind the
5121 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5122 defaults *did not work*, but could be mentioned syntactically. As
5123 such this breakage has minimal impact.
5128 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5129 matching against dereferenceable values.
5134 * The [`Extend`] trait, which grows a collection from an iterator, is
5135 implemented over iterators of references, for `String`, `Vec`,
5136 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5137 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5138 * The [`iter::once`] function returns an iterator that yields a single
5139 element, and [`iter::empty`] returns an iterator that yields no
5141 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5142 over substring matches.
5143 * [`Cell`] and [`RefCell`] both implement `Eq`.
5144 * A number of methods for wrapping arithmetic are added to the
5145 integral types, [`wrapping_div`], [`wrapping_rem`],
5146 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5147 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5148 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5149 type.. It is illegal for the default arithmetic operations in Rust
5150 to overflow; the desire to wrap must be explicit.
5151 * The `{:#?}` formatting specifier [displays the alternate,
5152 pretty-printed][debugfmt] form of the `Debug` formatter. This
5153 feature was actually introduced prior to 1.0 with little
5155 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5156 for writing data to formatted strings, similar to [`io::Write`].
5157 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5158 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5159 are used by code generators to emit implementations of [`Debug`].
5160 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5161 methods that convert case, following Unicode case mapping.
5162 * It is now easier to handle poisoned locks. The [`PoisonError`]
5163 type, returned by failing lock operations, exposes `into_inner`,
5164 `get_ref`, and `get_mut`, which all give access to the inner lock
5165 guard, and allow the poisoned lock to continue to operate. The
5166 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5167 poisoned lock without attempting to take the lock.
5168 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5169 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5170 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5171 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5173 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5179 * `rustc` employs smarter heuristics for guessing at [typos].
5180 * `rustc` emits more efficient code for [no-op conversions between
5181 unsafe pointers][nop].
5182 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5183 resulting in faster compile times and smaller code.
5185 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5186 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5187 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5188 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5189 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5190 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5191 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5192 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5193 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5194 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5195 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5196 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5197 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5198 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5199 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5200 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5201 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5202 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5203 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5204 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5205 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5206 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5207 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5208 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5209 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5210 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5211 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5212 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5213 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5214 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5215 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5216 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5217 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5218 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5219 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5220 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5221 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5222 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5223 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5224 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5225 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5226 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5227 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5228 [align]: https://github.com/rust-lang/rust/pull/25646
5229 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5230 [typos]: https://github.com/rust-lang/rust/pull/26087
5231 [nop]: https://github.com/rust-lang/rust/pull/26336
5232 [fat]: https://github.com/rust-lang/rust/pull/26411
5233 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5234 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5235 [packed]: https://github.com/rust-lang/rust/pull/25541
5236 [ad]: https://github.com/rust-lang/rust/pull/27382
5237 [win]: https://github.com/rust-lang/rust/pull/25350
5239 Version 1.1.0 (2015-06-25)
5240 =========================
5242 * ~850 changes, numerous bugfixes
5247 * The [`std::fs` module has been expanded][fs] to expand the set of
5248 functionality exposed:
5249 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5250 don't incur a syscall on some platforms.
5251 * A `symlink_metadata` function has been added.
5252 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5253 access to all underlying information.
5254 * The compiler now contains extended explanations of many errors. When an error
5255 with an explanation occurs the compiler suggests using the `--explain` flag
5256 to read the explanation. Error explanations are also [available online][err-index].
5257 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5258 well as other work, the time to bootstrap the compiler decreased by
5264 * The [`str::split_whitespace`] method splits a string on unicode
5265 whitespace boundaries.
5266 * On both Windows and Unix, new extension traits provide conversion of
5267 I/O types to and from the underlying system handles. On Unix, these
5268 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5269 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5270 `TcpListener`, and `UpdSocket`. Further implementations for
5271 `std::process` will be stabilized later.
5272 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5273 Windows, symlinks can be created with
5274 `std::os::windows::symlink_dir` and
5275 `std::os::windows::symlink_file`.
5276 * The `mpsc::Receiver` type can now be converted into an iterator with
5277 `into_iter` on the [`IntoIterator`] trait.
5278 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5279 implementation of the [`From`] trait.
5280 * The `Debug` implementation for `RangeFull` [creates output that is
5281 more consistent with other implementations][rf].
5282 * [`Debug` is implemented for `File`][file].
5283 * The `Default` implementation for `Arc` [no longer requires `Sync +
5285 * [The `Iterator` methods `count`, `nth`, and `last` have been
5286 overridden for slices to have O(1) performance instead of O(n)][si].
5287 * Incorrect handling of paths on Windows has been improved in both the
5288 compiler and the standard library.
5289 * [`AtomicPtr` gained a `Default` implementation][ap].
5290 * In accordance with Rust's policy on arithmetic overflow `abs` now
5291 [panics on overflow when debug assertions are enabled][abs].
5292 * The [`Cloned`] iterator, which was accidentally left unstable for
5293 1.0 [has been stabilized][c].
5294 * The [`Incoming`] iterator, which iterates over incoming TCP
5295 connections, and which was accidentally unnamable in 1.0, [is now
5296 properly exported][inc].
5297 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5298 `sift_up` or `sift_down` panic][bh].
5299 * The [`split_off`] method of `LinkedList` [no longer corrupts
5300 the list in certain scenarios][ll].
5305 * Type checking performance [has improved notably][sk] with
5306 [multiple improvements][pre].
5307 * The compiler [suggests code changes][ch] for more errors.
5308 * rustc and it's build system have experimental support for [building
5309 toolchains against MUSL][m] instead of glibc on Linux.
5310 * The compiler defines the `target_env` cfg value, which is used for
5311 distinguishing toolchains that are otherwise for the same
5312 platform. Presently this is set to `gnu` for common GNU Linux
5313 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5314 * The [`cargo rustc`][crc] command invokes a build with custom flags
5316 * [Android executables are always position independent][pie].
5317 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5320 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5321 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5322 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5323 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5324 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5325 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5326 [rf]: https://github.com/rust-lang/rust/pull/24491
5327 [err-index]: https://doc.rust-lang.org/error-index.html
5328 [sk]: https://github.com/rust-lang/rust/pull/24615
5329 [pre]: https://github.com/rust-lang/rust/pull/25323
5330 [file]: https://github.com/rust-lang/rust/pull/24598
5331 [ch]: https://github.com/rust-lang/rust/pull/24683
5332 [arc]: https://github.com/rust-lang/rust/pull/24695
5333 [si]: https://github.com/rust-lang/rust/pull/24701
5334 [ap]: https://github.com/rust-lang/rust/pull/24834
5335 [m]: https://github.com/rust-lang/rust/pull/24777
5336 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5337 [crc]: https://github.com/rust-lang/cargo/pull/1568
5338 [pie]: https://github.com/rust-lang/rust/pull/24953
5339 [abs]: https://github.com/rust-lang/rust/pull/25441
5340 [c]: https://github.com/rust-lang/rust/pull/25496
5341 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5342 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5343 [inc]: https://github.com/rust-lang/rust/pull/25522
5344 [bh]: https://github.com/rust-lang/rust/pull/25856
5345 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5346 [ll]: https://github.com/rust-lang/rust/pull/26022
5347 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5348 [drop]: https://github.com/rust-lang/rust/pull/24935
5350 Version 1.0.0 (2015-05-15)
5351 ========================
5353 * ~1500 changes, numerous bugfixes
5358 * The vast majority of the standard library is now `#[stable]`. It is
5359 no longer possible to use unstable features with a stable build of
5361 * Many popular crates on [crates.io] now work on the stable release
5363 * Arithmetic on basic integer types now [checks for overflow in debug
5369 * Several [restrictions have been added to trait coherence][coh] in
5370 order to make it easier for upstream authors to change traits
5371 without breaking downstream code.
5372 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5373 improve error messages and macro behavior. For example, `0b1234` is
5374 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5375 * Trait bounds [are always invariant][inv], eliminating the need for
5376 the `PhantomFn` and `MarkerTrait` lang items, which have been
5378 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5379 "foo" as bar` syntax has been replaced with `extern crate foo as
5380 bar`, and Cargo now automatically translates "-" in *package* names
5381 to underscore for the crate name.
5382 * [Lifetime shadowing is an error][lt].
5383 * [`Send` no longer implies `'static`][send-rfc].
5384 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5385 `MyType::default()`.
5386 * Primitive types [now have inherent methods][prim-inherent],
5387 obviating the need for extension traits like `SliceExt`.
5388 * Methods with `Self: Sized` in their `where` clause are [considered
5389 object-safe][self-sized], allowing many extension traits like
5390 `IteratorExt` to be merged into the traits they extended.
5391 * You can now [refer to associated types][assoc-where] whose
5392 corresponding trait bounds appear only in a `where` clause.
5393 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5394 like `Send` and `Sync` are now library-defined.
5395 * A [Reflect trait][reflect] was introduced, which means that
5396 downcasting via the `Any` trait is effectively limited to concrete
5397 types. This helps retain the potentially-important "parametricity"
5398 property: generic code cannot behave differently for different type
5399 arguments except in minor ways.
5400 * The `unsafe_destructor` feature is now deprecated in favor of the
5401 [new `dropck`][dropck]. This change is a major reduction in unsafe
5407 * The `thread_local` module [has been renamed to `std::thread`][th].
5408 * The methods of `IteratorExt` [have been moved to the `Iterator`
5410 * Several traits that implement Rust's conventions for type
5411 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5412 [centralized in the `std::convert` module][con].
5413 * The `FromError` trait [was removed in favor of `From`][fe].
5414 * The basic sleep function [has moved to
5415 `std::thread::sleep_ms`][slp].
5416 * The `splitn` function now takes an `n` parameter that represents the
5417 number of items yielded by the returned iterator [instead of the
5418 number of 'splits'][spl].
5419 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5420 * [Derived implementations of `PartialOrd` now order enums according
5421 to their explicitly-assigned discriminants][po].
5422 * [Methods for searching strings are generic over `Pattern`s][pat],
5423 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5425 * [In method resolution, object methods are resolved before inherent
5427 * [`String::from_str` has been deprecated in favor of the `From` impl,
5428 `String::from`][sf].
5429 * [`io::Error` implements `Sync`][ios].
5430 * [The `words` method on `&str` has been replaced with
5431 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5433 * The new path and IO modules are complete and `#[stable]`. This
5434 was the major library focus for this cycle.
5435 * The path API was [revised][path-normalize] to normalize `.`,
5436 adjusting the tradeoffs in favor of the most common usage.
5437 * A large number of remaining APIs in `std` were also stabilized
5438 during this cycle; about 75% of the non-deprecated API surface
5440 * The new [string pattern API][string-pattern] landed, which makes
5441 the string slice API much more internally consistent and flexible.
5442 * A new set of [generic conversion traits][conversion] replaced
5443 many existing ad hoc traits.
5444 * Generic numeric traits were [completely removed][num-traits]. This
5445 was made possible thanks to inherent methods for primitive types,
5446 and the removal gives maximal flexibility for designing a numeric
5447 hierarchy in the future.
5448 * The `Fn` traits are now related via [inheritance][fn-inherit]
5449 and provide ergonomic [blanket implementations][fn-blanket].
5450 * The `Index` and `IndexMut` traits were changed to
5451 [take the index by value][index-value], enabling code like
5452 `hash_map["string"]` to work.
5453 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5454 `Copy` data is known to be `Clone` as well.
5459 * Many errors now have extended explanations that can be accessed with
5460 the `--explain` flag to `rustc`.
5461 * Many new examples have been added to the standard library
5463 * rustdoc has received a number of improvements focused on completion
5465 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5466 * Much headway was made on ecosystem-wide CI, making it possible
5467 to [compare builds for breakage][ci-compare].
5470 [crates.io]: http://crates.io
5471 [clo]: https://github.com/rust-lang/rust/pull/24034
5472 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5473 [con]: https://github.com/rust-lang/rust/pull/23875
5474 [cr]: https://github.com/rust-lang/rust/pull/23419
5475 [fe]: https://github.com/rust-lang/rust/pull/23879
5476 [ie]: https://github.com/rust-lang/rust/pull/23300
5477 [inv]: https://github.com/rust-lang/rust/pull/23938
5478 [ios]: https://github.com/rust-lang/rust/pull/24133
5479 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5480 [lt]: https://github.com/rust-lang/rust/pull/24057
5481 [meth]: https://github.com/rust-lang/rust/pull/24056
5482 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5483 [po]: https://github.com/rust-lang/rust/pull/24270
5484 [sf]: https://github.com/rust-lang/rust/pull/24517
5485 [slp]: https://github.com/rust-lang/rust/pull/23949
5486 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5487 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5488 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5489 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5490 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5491 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5492 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5493 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5494 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5495 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5496 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5497 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5498 [reflect]: https://github.com/rust-lang/rust/pull/23712
5499 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5500 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5501 [index-value]: https://github.com/rust-lang/rust/pull/23601
5502 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5503 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5504 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5505 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5506 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5507 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5510 Version 1.0.0-alpha.2 (2015-02-20)
5511 =====================================
5513 * ~1300 changes, numerous bugfixes
5517 * The various I/O modules were [overhauled][io-rfc] to reduce
5518 unnecessary abstractions and provide better interoperation with
5519 the underlying platform. The old `io` module remains temporarily
5521 * The standard library now [participates in feature gating][feat],
5522 so use of unstable libraries now requires a `#![feature(...)]`
5523 attribute. The impact of this change is [described on the
5524 forum][feat-forum]. [RFC][feat-rfc].
5528 * `for` loops [now operate on the `IntoIterator` trait][into],
5529 which eliminates the need to call `.iter()`, etc. to iterate
5530 over collections. There are some new subtleties to remember
5531 though regarding what sort of iterators various types yield, in
5532 particular that `for foo in bar { }` yields values from a move
5533 iterator, destroying the original collection. [RFC][into-rfc].
5534 * Objects now have [default lifetime bounds][obj], so you don't
5535 have to write `Box<Trait+'static>` when you don't care about
5536 storing references. [RFC][obj-rfc].
5537 * In types that implement `Drop`, [lifetimes must outlive the
5538 value][drop]. This will soon make it possible to safely
5539 implement `Drop` for types where `#[unsafe_destructor]` is now
5540 required. Read the [gorgeous RFC][drop-rfc] for details.
5541 * The fully qualified <T as Trait>::X syntax lets you set the Self
5542 type for a trait method or associated type. [RFC][ufcs-rfc].
5543 * References to types that implement `Deref<U>` now [automatically
5544 coerce to references][deref] to the dereferenced type `U`,
5545 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5546 should eliminate many unsightly uses of `&*`, as when converting
5547 from references to vectors into references to
5548 slices. [RFC][deref-rfc].
5549 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5550 `|:|`) is obsolete and closure kind is inferred from context.
5551 * [`Self` is a keyword][Self].
5555 * The `Show` and `String` formatting traits [have been
5556 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5557 their related purposes. Automatically getting a string
5558 conversion to use with `format!("{:?}", something_to_debug)` is
5559 now written `#[derive(Debug)]`.
5560 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5561 OsStr}`, provide strings in platform-specific encodings for easier
5562 interop with system APIs. [RFC][osstr-rfc].
5563 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5564 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5565 creating raw pointers.
5569 * Certain long error messages of the form 'expected foo found bar'
5570 are now [split neatly across multiple
5571 lines][multiline]. Examples in the PR.
5572 * On Unix Rust can be [uninstalled][un] by running
5573 `/usr/local/lib/rustlib/uninstall.sh`.
5574 * The `#[rustc_on_unimplemented]` attribute, requiring the
5575 'on_unimplemented' feature, lets rustc [display custom error
5576 messages when a trait is expected to be implemented for a type
5581 * Rust is tested against a [LALR grammar][lalr], which parses
5582 almost all the Rust files that rustc does.
5584 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5585 [close]: https://github.com/rust-lang/rust/pull/21843
5586 [deref]: https://github.com/rust-lang/rust/pull/21351
5587 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5588 [drop]: https://github.com/rust-lang/rust/pull/21972
5589 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5590 [feat]: https://github.com/rust-lang/rust/pull/21248
5591 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5592 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5593 [fmt]: https://github.com/rust-lang/rust/pull/21457
5594 [into]: https://github.com/rust-lang/rust/pull/20790
5595 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5596 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5597 [lalr]: https://github.com/rust-lang/rust/pull/21452
5598 [multiline]: https://github.com/rust-lang/rust/pull/19870
5599 [obj]: https://github.com/rust-lang/rust/pull/22230
5600 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5601 [onun]: https://github.com/rust-lang/rust/pull/20889
5602 [osstr]: https://github.com/rust-lang/rust/pull/21488
5603 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5604 [Self]: https://github.com/rust-lang/rust/pull/22158
5605 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5606 [un]: https://github.com/rust-lang/rust/pull/22256
5609 Version 1.0.0-alpha (2015-01-09)
5610 ==================================
5612 * ~2400 changes, numerous bugfixes
5616 * The language itself is considered feature complete for 1.0,
5617 though there will be many usability improvements and bugfixes
5618 before the final release.
5619 * Nearly 50% of the public API surface of the standard library has
5620 been declared 'stable'. Those interfaces are unlikely to change
5622 * The long-running debate over integer types has been
5623 [settled][ints]: Rust will ship with types named `isize` and
5624 `usize`, rather than `int` and `uint`, for pointer-sized
5625 integers. Guidelines will be rolled out during the alpha cycle.
5626 * Most crates that are not `std` have been moved out of the Rust
5627 distribution into the Cargo ecosystem so they can evolve
5628 separately and don't need to be stabilized as quickly, including
5629 'time', 'getopts', 'num', 'regex', and 'term'.
5630 * Documentation continues to be expanded with more API coverage, more
5631 examples, and more in-depth explanations. The guides have been
5632 consolidated into [The Rust Programming Language][trpl].
5633 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5634 * All official Rust binary installers now come with [Cargo], the
5635 Rust package manager.
5639 * Closures have been [completely redesigned][unboxed] to be
5640 implemented in terms of traits, can now be used as generic type
5641 bounds and thus monomorphized and inlined, or via an opaque
5642 pointer (boxed) as in the old system. The new system is often
5643 referred to as 'unboxed' closures.
5644 * Traits now support [associated types][assoc], allowing families
5645 of related types to be defined together and used generically in
5647 * Enum variants are [namespaced by their type names][enum].
5648 * [`where` clauses][where] provide a more versatile and attractive
5649 syntax for specifying generic bounds, though the previous syntax
5651 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5653 * Rust [no longer has a runtime][rt] of any description, and only
5654 supports OS threads, not green threads.
5655 * At long last, Rust has been overhauled for 'dynamically-sized
5656 types' ([DST]), which integrates 'fat pointers' (object types,
5657 arrays, and `str`) more deeply into the type system, making it
5659 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5660 `..j` that produce range types and which, when combined with the
5661 `Index` operator and multidispatch, leads to a convenient slice
5663 * The new range syntax revealed an ambiguity in the fixed-length
5664 array syntax, so now fixed length arrays [are written `[T;
5666 * The `Copy` trait is no longer implemented automatically. Unsafe
5667 pointers no longer implement `Sync` and `Send` so types
5668 containing them don't automatically either. `Sync` and `Send`
5669 are now 'unsafe traits' so one can "forcibly" implement them via
5670 `unsafe impl` if a type confirms to the requirements for them
5671 even though the internals do not (e.g. structs containing unsafe
5672 pointers like `Arc`). These changes are intended to prevent some
5673 footguns and are collectively known as [opt-in built-in
5674 traits][oibit] (though `Sync` and `Send` will soon become pure
5675 library types unknown to the compiler).
5676 * Operator traits now take their operands [by value][ops], and
5677 comparison traits can use multidispatch to compare one type
5678 against multiple other types, allowing e.g. `String` to be
5679 compared with `&str`.
5680 * `if let` and `while let` are no longer feature-gated.
5681 * Rust has adopted a more [uniform syntax for escaping unicode
5682 characters][unicode].
5683 * `macro_rules!` [has been declared stable][mac]. Though it is a
5684 flawed system it is sufficiently popular that it must be usable
5685 for 1.0. Effort has gone into [future-proofing][mac-future] it
5686 in ways that will allow other macro systems to be developed in
5687 parallel, and won't otherwise impact the evolution of the
5689 * The prelude has been [pared back significantly][prelude] such
5690 that it is the minimum necessary to support the most pervasive
5691 code patterns, and through [generalized where clauses][where]
5692 many of the prelude extension traits have been consolidated.
5693 * Rust's rudimentary reflection [has been removed][refl], as it
5694 incurred too much code generation for little benefit.
5695 * [Struct variants][structvars] are no longer feature-gated.
5696 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5697 known as 'higher-ranked trait bounds', this crucially allows
5698 unboxed closures to work.
5699 * Macros invocations surrounded by parens or square brackets and
5700 not terminated by a semicolon are [parsed as
5701 expressions][macros], which makes expressions like `vec![1i32,
5702 2, 3].len()` work as expected.
5703 * Trait objects now implement their traits automatically, and
5704 traits that can be coerced to objects now must be [object
5706 * Automatically deriving traits is now done with `#[derive(...)]`
5707 not `#[deriving(...)]` for [consistency with other naming
5708 conventions][derive].
5709 * Importing the containing module or enum at the same time as
5710 items or variants they contain is [now done with `self` instead
5711 of `mod`][self], as in use `foo::{self, bar}`
5712 * Glob imports are no longer feature-gated.
5713 * The `box` operator and `box` patterns have been feature-gated
5714 pending a redesign. For now unique boxes should be allocated
5715 like other containers, with `Box::new`.
5719 * A [series][coll1] of [efforts][coll2] to establish
5720 [conventions][coll3] for collections types has resulted in API
5721 improvements throughout the standard library.
5722 * New [APIs for error handling][err] provide ergonomic interop
5723 between error types, and [new conventions][err-conv] describe
5724 more clearly the recommended error handling strategies in Rust.
5725 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5726 it is easier to discuss failure in the context of error handling
5727 without making clarifications as to whether you are referring to
5728 the 'fail' macro or failure more generally.
5729 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5730 syscall when available.
5731 * The 'serialize' crate has been renamed 'rustc-serialize' and
5732 moved out of the distribution to Cargo. Although it is widely
5733 used now, it is expected to be superseded in the near future.
5734 * The `Show` formatter, typically implemented with
5735 `#[derive(Show)]` is [now requested with the `{:?}`
5736 specifier][show] and is intended for use by all types, for uses
5737 such as `println!` debugging. The new `String` formatter must be
5738 implemented by hand, uses the `{}` specifier, and is intended
5739 for full-fidelity conversions of things that can logically be
5740 represented as strings.
5744 * [Flexible target specification][flex] allows rustc's code
5745 generation to be configured to support otherwise-unsupported
5747 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5748 respective debuggers with Rust-appropriate pretty-printing.
5749 * The Windows installation of Rust is distributed with the
5750 MinGW components currently required to link binaries on that
5755 * Nullable enum optimizations have been extended to more types so
5756 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5757 space than the inner types themselves.
5758 * Work has begun on supporting AArch64.
5760 [Cargo]: https://crates.io
5761 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5762 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5763 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5764 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5765 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5766 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5767 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5768 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5769 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5770 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5771 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5772 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5773 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5774 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5775 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5776 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5777 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5778 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5779 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5780 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5781 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5782 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5783 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5784 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5785 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5786 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5787 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5788 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5789 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5790 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5791 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5792 [trpl]: https://doc.rust-lang.org/book/index.html
5793 [rbe]: http://rustbyexample.com/
5796 Version 0.12.0 (2014-10-09)
5797 =============================
5799 * ~1900 changes, numerous bugfixes
5803 * The introductory documentation (now called The Rust Guide) has
5804 been completely rewritten, as have a number of supplementary
5806 * Rust's package manager, Cargo, continues to improve and is
5807 sometimes considered to be quite awesome.
5808 * Many API's in `std` have been reviewed and updated for
5809 consistency with the in-development Rust coding
5810 guidelines. The standard library documentation tracks
5811 stabilization progress.
5812 * Minor libraries have been moved out-of-tree to the rust-lang org
5813 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5814 be installed with Cargo.
5815 * Lifetime elision allows lifetime annotations to be left off of
5816 function declarations in many common scenarios.
5817 * Rust now works on 64-bit Windows.
5820 * Indexing can be overloaded with the `Index` and `IndexMut`
5822 * The `if let` construct takes a branch only if the `let` pattern
5823 matches, currently behind the 'if_let' feature gate.
5824 * 'where clauses', a more flexible syntax for specifying trait
5825 bounds that is more aesthetic, have been added for traits and
5826 free functions. Where clauses will in the future make it
5827 possible to constrain associated types, which would be
5828 impossible with the existing syntax.
5829 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5830 the 'slicing_syntax' feature gate, and can be overloaded with
5831 the `Slice` or `SliceMut` traits.
5832 * The syntax for matching of sub-slices has been changed to use a
5833 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5834 consistency with other uses of `..` and to future-proof
5835 potential additional uses of the syntax.
5836 * The syntax for matching inclusive ranges in patterns has changed
5837 from `0..3` to `0...4` to be consistent with the exclusive range
5839 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5840 c]`) has been put behind the 'advanced_slice_patterns' feature
5841 gate and may be removed in the future.
5842 * Components of tuples and tuple structs can be extracted using
5843 the `value.0` syntax, currently behind the `tuple_indexing`
5845 * The `#[crate_id]` attribute is no longer supported; versioning
5846 is handled by the package manager.
5847 * Renaming crate imports are now written `extern crate foo as bar`
5848 instead of `extern crate bar = foo`.
5849 * Renaming use statements are now written `use foo as bar` instead
5851 * `let` and `match` bindings and argument names in macros are now
5853 * The new, more efficient, closure types ('unboxed closures') have
5854 been added under a feature gate, 'unboxed_closures'. These will
5855 soon replace the existing closure types, once higher-ranked
5856 trait lifetimes are added to the language.
5857 * `move` has been added as a keyword, for indicating closures
5858 that capture by value.
5859 * Mutation and assignment is no longer allowed in pattern guards.
5860 * Generic structs and enums can now have trait bounds.
5861 * The `Share` trait is now called `Sync` to free up the term
5862 'shared' to refer to 'shared reference' (the default reference
5864 * Dynamically-sized types have been mostly implemented,
5865 unifying the behavior of fat-pointer types with the rest of the
5867 * As part of dynamically-sized types, the `Sized` trait has been
5868 introduced, which qualifying types implement by default, and
5869 which type parameters expect by default. To specify that a type
5870 parameter does not need to be sized, write `<Sized? T>`. Most
5871 types are `Sized`, notable exceptions being unsized arrays
5872 (`[T]`) and trait types.
5873 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5874 * Lifetime bounds can now be applied to type parameters and object
5876 * The old, reference counted GC type, `Gc<T>` which was once
5877 denoted by the `@` sigil, has finally been removed. GC will be
5878 revisited in the future.
5881 * Library documentation has been improved for a number of modules.
5882 * Bit-vectors, collections::bitv has been modernized.
5883 * The url crate is deprecated in favor of
5884 http://github.com/servo/rust-url, which can be installed with
5886 * Most I/O stream types can be cloned and subsequently closed from
5888 * A `std::time::Duration` type has been added for use in I/O
5889 methods that rely on timers, as well as in the 'time' crate's
5890 `Timespec` arithmetic.
5891 * The runtime I/O abstraction layer that enabled the green thread
5892 scheduler to do non-thread-blocking I/O has been removed, along
5893 with the libuv-based implementation employed by the green thread
5894 scheduler. This will greatly simplify the future I/O work.
5895 * `collections::btree` has been rewritten to have a more
5896 idiomatic and efficient design.
5899 * rustdoc output now indicates the stability levels of API's.
5900 * The `--crate-name` flag can specify the name of the crate
5901 being compiled, like `#[crate_name]`.
5902 * The `-C metadata` specifies additional metadata to hash into
5903 symbol names, and `-C extra-filename` specifies additional
5904 information to put into the output filename, for use by the
5905 package manager for versioning.
5906 * debug info generation has continued to improve and should be
5907 more reliable under both gdb and lldb.
5908 * rustc has experimental support for compiling in parallel
5909 using the `-C codegen-units` flag.
5910 * rustc no longer encodes rpath information into binaries by
5914 * Stack usage has been optimized with LLVM lifetime annotations.
5915 * Official Rust binaries on Linux are more compatible with older
5916 kernels and distributions, built on CentOS 5.10.
5919 Version 0.11.0 (2014-07-02)
5920 ==========================
5922 * ~1700 changes, numerous bugfixes
5925 * ~[T] has been removed from the language. This type is superseded by
5927 * ~str has been removed from the language. This type is superseded by
5929 * ~T has been removed from the language. This type is superseded by the
5931 * @T has been removed from the language. This type is superseded by the
5932 standard library's std::gc::Gc<T> type.
5933 * Struct fields are now all private by default.
5934 * Vector indices and shift amounts are both required to be a `uint`
5935 instead of any integral type.
5936 * Byte character, byte string, and raw byte string literals are now all
5937 supported by prefixing the normal literal with a `b`.
5938 * Multiple ABIs are no longer allowed in an ABI string
5939 * The syntax for lifetimes on closures/procedures has been tweaked
5940 slightly: `<'a>|A, B|: 'b + K -> T`
5941 * Floating point modulus has been removed from the language; however it
5942 is still provided by a library implementation.
5943 * Private enum variants are now disallowed.
5944 * The `priv` keyword has been removed from the language.
5945 * A closure can no longer be invoked through a &-pointer.
5946 * The `use foo, bar, baz;` syntax has been removed from the language.
5947 * The transmute intrinsic no longer works on type parameters.
5948 * Statics now allow blocks/items in their definition.
5949 * Trait bounds are separated from objects with + instead of : now.
5950 * Objects can no longer be read while they are mutably borrowed.
5951 * The address of a static is now marked as insignificant unless the
5952 #[inline(never)] attribute is placed it.
5953 * The #[unsafe_destructor] attribute is now behind a feature gate.
5954 * Struct literals are no longer allowed in ambiguous positions such as
5955 if, while, match, and for..in.
5956 * Declaration of lang items and intrinsics are now feature-gated by
5958 * Integral literals no longer default to `int`, and floating point
5959 literals no longer default to `f64`. Literals must be suffixed with an
5960 appropriate type if inference cannot determine the type of the
5962 * The Box<T> type is no longer implicitly borrowed to &mut T.
5963 * Procedures are now required to not capture borrowed references.
5966 * The standard library is now a "facade" over a number of underlying
5967 libraries. This means that development on the standard library should
5968 be speedier due to smaller crates, as well as a clearer line between
5970 * A new library, libcore, lives under the standard library's facade
5971 which is Rust's "0-assumption" library, suitable for embedded and
5972 kernel development for example.
5973 * A regex crate has been added to the standard distribution. This crate
5974 includes statically compiled regular expressions.
5975 * The unwrap/unwrap_err methods on Result require a Show bound for
5976 better error messages.
5977 * The return types of the std::comm primitives have been centralized
5978 around the Result type.
5979 * A number of I/O primitives have gained the ability to time out their
5981 * A number of I/O primitives have gained the ability to close their
5982 reading/writing halves to cancel pending operations.
5983 * Reverse iterator methods have been removed in favor of `rev()` on
5984 their forward-iteration counterparts.
5985 * A bitflags! macro has been added to enable easy interop with C and
5986 management of bit flags.
5987 * A debug_assert! macro is now provided which is disabled when
5988 `--cfg ndebug` is passed to the compiler.
5989 * A graphviz crate has been added for creating .dot files.
5990 * The std::cast module has been migrated into std::mem.
5991 * The std::local_data api has been migrated from freestanding functions
5992 to being based on methods.
5993 * The Pod trait has been renamed to Copy.
5994 * jemalloc has been added as the default allocator for types.
5995 * The API for allocating memory has been changed to use proper alignment
5996 and sized deallocation
5997 * Connecting a TcpStream or binding a TcpListener is now based on a
5998 string address and a u16 port. This allows connecting to a hostname as
6000 * The Reader trait now contains a core method, read_at_least(), which
6001 correctly handles many repeated 0-length reads.
6002 * The process-spawning API is now centered around a builder-style
6004 * The :? printing qualifier has been moved from the standard library to
6005 an external libdebug crate.
6006 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6007 have been renamed to Eq/Ord.
6008 * The select/plural methods have been removed from format!. The escapes
6009 for { and } have also changed from \{ and \} to {{ and }},
6011 * The TaskBuilder API has been re-worked to be a true builder, and
6012 extension traits for spawning native/green tasks have been added.
6015 * All breaking changes to the language or libraries now have their
6016 commit message annotated with `[breaking-change]` to allow for easy
6017 discovery of breaking changes.
6018 * The compiler will now try to suggest how to annotate lifetimes if a
6019 lifetime-related error occurs.
6020 * Debug info continues to be improved greatly with general bug fixes and
6021 better support for situations like link time optimization (LTO).
6022 * Usage of syntax extensions when cross-compiling has been fixed.
6023 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6024 -fdata-sections and --gc-sections has been enabled by default
6025 * The compiler is now stricter about where it will load module files
6026 from when a module is declared via `mod foo;`.
6027 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6028 Syntax extensions are now discovered via a "plugin registrar" type
6029 which will be extended in the future to other various plugins.
6030 * Lints have been restructured to allow for dynamically loadable lints.
6031 * A number of rustdoc improvements:
6032 * The HTML output has been visually redesigned.
6033 * Markdown is now powered by hoedown instead of sundown.
6034 * Searching heuristics have been greatly improved.
6035 * The search index has been reduced in size by a great amount.
6036 * Cross-crate documentation via `pub use` has been greatly improved.
6037 * Primitive types are now hyperlinked and documented.
6038 * Documentation has been moved from static.rust-lang.org/doc to
6040 * A new sandbox, play.rust-lang.org, is available for running and
6041 sharing rust code examples on-line.
6042 * Unused attributes are now more robustly warned about.
6043 * The dead_code lint now warns about unused struct fields.
6044 * Cross-compiling to iOS is now supported.
6045 * Cross-compiling to mipsel is now supported.
6046 * Stability attributes are now inherited by default and no longer apply
6047 to intra-crate usage, only inter-crate usage.
6048 * Error message related to non-exhaustive match expressions have been
6052 Version 0.10 (2014-04-03)
6053 =========================
6055 * ~1500 changes, numerous bugfixes
6058 * A new RFC process is now in place for modifying the language.
6059 * Patterns with `@`-pointers have been removed from the language.
6060 * Patterns with unique vectors (`~[T]`) have been removed from the
6062 * Patterns with unique strings (`~str`) have been removed from the
6064 * `@str` has been removed from the language.
6065 * `@[T]` has been removed from the language.
6066 * `@self` has been removed from the language.
6067 * `@Trait` has been removed from the language.
6068 * Headers on `~` allocations which contain `@` boxes inside the type for
6069 reference counting have been removed.
6070 * The semantics around the lifetimes of temporary expressions have changed,
6071 see #3511 and #11585 for more information.
6072 * Cross-crate syntax extensions are now possible, but feature gated. See
6073 #11151 for more information. This includes both `macro_rules!` macros as
6074 well as syntax extensions such as `format!`.
6075 * New lint modes have been added, and older ones have been turned on to be
6077 * Unnecessary parentheses
6080 * Uppercase variables
6081 * Publicly visible private types
6082 * `#[deriving]` with raw pointers
6083 * Unsafe functions can no longer be coerced to closures.
6084 * Various obscure macros such as `log_syntax!` are now behind feature gates.
6085 * The `#[simd]` attribute is now behind a feature gate.
6086 * Visibility is no longer allowed on `extern crate` statements, and
6087 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
6088 * Trailing commas are now allowed in argument lists and tuple patterns.
6089 * The `do` keyword has been removed, it is now a reserved keyword.
6090 * Default type parameters have been implemented, but are feature gated.
6091 * Borrowed variables through captures in closures are now considered soundly.
6092 * `extern mod` is now `extern crate`
6093 * The `Freeze` trait has been removed.
6094 * The `Share` trait has been added for types that can be shared among
6096 * Labels in macros are now hygienic.
6097 * Expression/statement macro invocations can be delimited with `{}` now.
6098 * Treatment of types allowed in `static mut` locations has been tweaked.
6099 * The `*` and `.` operators are now overloadable through the `Deref` and
6101 * `~Trait` and `proc` no longer have `Send` bounds by default.
6102 * Partial type hints are now supported with the `_` type marker.
6103 * An `Unsafe` type was introduced for interior mutability. It is now
6104 considered undefined to transmute from `&T` to `&mut T` without using the
6106 * The #[linkage] attribute was implemented for extern statics/functions.
6107 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6108 * `Pod` was renamed to `Copy`.
6111 * The `libextra` library has been removed. It has now been decomposed into
6112 component libraries with smaller and more focused nuggets of
6113 functionality. The full list of libraries can be found on the
6114 documentation index page.
6115 * std: `std::condition` has been removed. All I/O errors are now propagated
6116 through the `Result` type. In order to assist with error handling, a
6117 `try!` macro for unwrapping errors with an early return and a lint for
6118 unused results has been added. See #12039 for more information.
6119 * std: The `vec` module has been renamed to `slice`.
6120 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6121 This will become the only growable vector in the future.
6122 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6123 are now found at `std::io::BufferedReader` instead of
6124 `std::io::buffered::BufferedReader`.
6125 * std: `print` and `println` are no longer in the prelude, the `print!` and
6126 `println!` macros are intended to be used instead.
6127 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6128 attempts to statically prevent cycles.
6129 * std: The standard distribution is adopting the policy of pushing failure
6130 to the user rather than failing in libraries. Many functions (such as
6131 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6132 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6133 deriving mode: `#[deriving(Show)]`.
6134 * std: `ToStr` is now implemented for all types implementing `Show`.
6135 * std: The formatting trait methods now take `&self` instead of `&T`
6136 * std: The `invert()` method on iterators has been renamed to `rev()`
6137 * std: `std::num` has seen a reduction in the genericity of its traits,
6138 consolidating functionality into a few core traits.
6139 * std: Backtraces are now printed on task failure if the environment
6140 variable `RUST_BACKTRACE` is present.
6141 * std: Naming conventions for iterators have been standardized. More details
6142 can be found on the wiki's style guide.
6143 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6144 still implement the function.
6145 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6146 * std: `assert_approx_eq!` has been removed
6147 * std: The `e` and `E` formatting specifiers for floats have been added to
6148 print them in exponential notation.
6149 * std: The `Times` trait has been removed
6150 * std: Indications of variance and opting out of builtin bounds is done
6151 through marker types in `std::kinds::marker` now
6152 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6153 `#[deriving(Hash)]` is now possible.
6154 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6155 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6156 * std: `Chan::new` is now `channel()`.
6157 * std: A new synchronous channel type has been implemented.
6158 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6159 * std: `hashmap` and `trie` have been moved to `libcollections`
6160 * std: `run` has been rolled into `io::process`
6161 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6162 * std: The equality and comparison traits have seen some reorganization.
6163 * std: `rand` has moved to `librand`.
6164 * std: `to_{lower,upper}case` has been implemented for `char`.
6165 * std: Logging has been moved to `liblog`.
6166 * collections: `HashMap` has been rewritten for higher performance and less
6168 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6169 it can be booted manually. The runtime guide has more information and
6171 * native: All I/O functionality except signals has been implemented.
6172 * green: Task spawning with `libgreen` has been optimized with stack caching
6173 and various trimming of code.
6174 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6175 * sync: The `extra::sync` module has been updated to modern rust (and moved
6176 to the `sync` library), tweaking and improving various interfaces while
6177 dropping redundant functionality.
6178 * sync: A new `Barrier` type has been added to the `sync` library.
6179 * sync: An efficient mutex for native and green tasks has been implemented.
6180 * serialize: The `base64` module has seen some improvement. It treats
6181 newlines better, has non-string error values, and has seen general
6183 * fourcc: A `fourcc!` macro was introduced
6184 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6185 hexadecimal literal.
6188 * `rustpkg` has been deprecated and removed from the main repository. Its
6189 replacement, `cargo`, is under development.
6190 * Nightly builds of rust are now available
6191 * The memory usage of rustc has been improved many times throughout this
6193 * The build process supports disabling rpath support for the rustc binary
6195 * Code generation has improved in some cases, giving more information to the
6196 LLVM optimization passes to enable more extensive optimizations.
6197 * Debuginfo compatibility with lldb on OSX has been restored.
6198 * The master branch is now gated on an android bot, making building for
6199 android much more reliable.
6200 * Output flags have been centralized into one `--emit` flag.
6201 * Crate type flags have been centralized into one `--crate-type` flag.
6202 * Codegen flags have been consolidated behind a `-C` flag.
6203 * Linking against outdated crates now has improved error messages.
6204 * Error messages with lifetimes will often suggest how to annotate the
6205 function to fix the error.
6206 * Many more types are documented in the standard library, and new guides
6208 * Many `rustdoc` improvements:
6209 * code blocks are syntax highlighted.
6210 * render standalone markdown files.
6211 * the --test flag tests all code blocks by default.
6212 * exported macros are displayed.
6213 * re-exported types have their documentation inlined at the location of the
6215 * search works across crates that have been rendered to the same output
6219 Version 0.9 (2014-01-09)
6220 ==========================
6222 * ~1800 changes, numerous bugfixes
6225 * The `float` type has been removed. Use `f32` or `f64` instead.
6226 * A new facility for enabling experimental features (feature gating) has
6227 been added, using the crate-level `#[feature(foo)]` attribute.
6228 * Managed boxes (@) are now behind a feature gate
6229 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6230 standard library's `Gc` or `Rc` types instead.
6231 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6232 * Jumping back to the top of a loop is now done with `continue` instead of
6234 * Strings can no longer be mutated through index assignment.
6235 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6236 hash delimiters, as in `r###"foo"###`.
6237 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6239 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6240 * `@fn`s have been removed.
6241 * `do` only works with procs in order to make it obvious what the cost
6243 * Single-element tuple-like structs can no longer be dereferenced to
6244 obtain the inner value. A more comprehensive solution for overloading
6245 the dereference operator will be provided in the future.
6246 * The `#[link(...)]` attribute has been replaced with
6247 `#[crate_id = "name#vers"]`.
6248 * Empty `impl`s must be terminated with empty braces and may not be
6249 terminated with a semicolon.
6250 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6251 no longer has any special meaning.
6252 * The old `fmt!` string formatting macro has been removed.
6253 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6254 `print!` and `println!`.
6255 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6256 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6257 `extern mod foo = "bar"` instead.
6258 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6259 * Macros can have attributes.
6260 * Macros can expand to items with attributes.
6261 * Macros can expand to multiple items.
6262 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6263 * Comments may be nested.
6264 * Values automatically coerce to trait objects they implement, without
6266 * Enum discriminants are no longer an entire word but as small as needed to
6267 contain all the variants. The `repr` attribute can be used to override
6268 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6269 `#[repr(C)]` to match C enums.
6270 * Non-string literals are not allowed in attributes (they never worked).
6271 * The FFI now supports variadic functions.
6272 * Octal numeric literals, as in `0o7777`.
6273 * The `concat!` syntax extension performs compile-time string concatenation.
6274 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6275 removed as Rust no longer uses segmented stacks.
6276 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6277 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6278 not `*`; ignoring remaining fields of a struct is also done with `..`,
6279 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6280 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6281 * `rustc` supports the "system" calling convention, which defaults to the
6282 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6284 * The `type_overflow` lint (default: warn) checks literals for overflow.
6285 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6286 * The `attribute_usage` lint (default: warn) warns about unknown
6288 * The `unknown_features` lint (default: warn) warns about unknown
6290 * The `dead_code` lint (default: warn) checks for dead code.
6291 * Rust libraries can be linked statically to one another
6292 * `#[link_args]` is behind the `link_args` feature gate.
6293 * Native libraries are now linked with `#[link(name = "foo")]`
6294 * Native libraries can be statically linked to a rust crate
6295 (`#[link(name = "foo", kind = "static")]`).
6296 * Native OS X frameworks are now officially supported
6297 (`#[link(name = "foo", kind = "framework")]`).
6298 * The `#[thread_local]` attribute creates thread-local (not task-local)
6299 variables. Currently behind the `thread_local` feature gate.
6300 * The `return` keyword may be used in closures.
6301 * Types that can be copied via a memcpy implement the `Pod` kind.
6302 * The `cfg` attribute can now be used on struct fields and enum variants.
6305 * std: The `option` and `result` API's have been overhauled to make them
6306 simpler, more consistent, and more composable.
6307 * std: The entire `std::io` module has been replaced with one that is
6308 more comprehensive and that properly interfaces with the underlying
6309 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6311 * std: `io::util` contains a number of useful implementations of
6312 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6313 `ZeroReader`, `TeeReader`.
6314 * std: The reference counted pointer type `extra::rc` moved into std.
6315 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6316 just a wrapper around it).
6317 * std: The `Either` type has been removed.
6318 * std: `fmt::Default` can be implemented for any type to provide default
6319 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6320 * std: The `rand` API continues to be tweaked.
6321 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6322 on failure in gdb, is now named `rust_fail`.
6323 * std: The `each_key` and `each_value` methods on `HashMap` have been
6324 replaced by the `keys` and `values` iterators.
6325 * std: Functions dealing with type size and alignment have moved from the
6326 `sys` module to the `mem` module.
6327 * std: The `path` module was written and API changed.
6328 * std: `str::from_utf8` has been changed to cast instead of allocate.
6329 * std: `starts_with` and `ends_with` methods added to vectors via the
6330 `ImmutableEqVector` trait, which is in the prelude.
6331 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6332 if the index is out of bounds.
6333 * std: Task failure no longer propagates between tasks, as the model was
6334 complex, expensive, and incompatible with thread-based tasks.
6335 * std: The `Any` type can be used for dynamic typing.
6336 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6338 * std: Methods that produce iterators generally do not have an `_iter`
6340 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6341 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6342 * std: `util::ignore` renamed to `prelude::drop`.
6343 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6345 * std: `vec::raw` has seen a lot of cleanup and API changes.
6346 * std: The standard library no longer includes any C++ code, and very
6347 minimal C, eliminating the dependency on libstdc++.
6348 * std: Runtime scheduling and I/O functionality has been factored out into
6349 extensible interfaces and is now implemented by two different crates:
6350 libnative, for native threading and I/O; and libgreen, for green threading
6351 and I/O. This paves the way for using the standard library in more limited
6352 embedded environments.
6353 * std: The `comm` module has been rewritten to be much faster, have a
6354 simpler, more consistent API, and to work for both native and green
6356 * std: All libuv dependencies have been moved into the rustuv crate.
6357 * native: New implementations of runtime scheduling on top of OS threads.
6358 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6360 * green: The green thread scheduler and message passing types are almost
6362 * extra: The `flatpipes` module had bitrotted and was removed.
6363 * extra: All crypto functions have been removed and Rust now has a policy of
6364 not reimplementing crypto in the standard library. In the future crypto
6365 will be provided by external crates with bindings to established libraries.
6366 * extra: `c_vec` has been modernized.
6367 * extra: The `sort` module has been removed. Use the `sort` method on
6371 * The `rust` and `rusti` commands have been removed, due to lack of
6373 * `rustdoc` was completely rewritten.
6374 * `rustdoc` can test code examples in documentation.
6375 * `rustpkg` can test packages with the argument, 'test'.
6376 * `rustpkg` supports arbitrary dependencies, including C libraries.
6377 * `rustc`'s support for generating debug info is improved again.
6378 * `rustc` has better error reporting for unbalanced delimiters.
6379 * `rustc`'s JIT support was removed due to bitrot.
6380 * Executables and static libraries can be built with LTO (-Z lto)
6381 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6385 Version 0.8 (2013-09-26)
6386 ============================
6388 * ~2200 changes, numerous bugfixes
6391 * The `for` loop syntax has changed to work with the `Iterator` trait.
6392 * At long last, unwinding works on Windows.
6393 * Default methods are ready for use.
6394 * Many trait inheritance bugs fixed.
6395 * Owned and borrowed trait objects work more reliably.
6396 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6397 * rustc can omit emission of code for the `debug!` macro if it is passed
6399 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6400 for foo.rs, then foo/mod.rs, and will generate an error when both are
6402 * Strings no longer contain trailing nulls. The new `std::c_str` module
6403 provides new mechanisms for converting to C strings.
6404 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6405 * The FFI has been overhauled such that foreign functions are called directly,
6406 instead of through a stack-switching wrapper.
6407 * Calling a foreign function must be done through a Rust function with the
6408 `#[fixed_stack_segment]` attribute.
6409 * The `externfn!` macro can be used to declare both a foreign function and
6410 a `#[fixed_stack_segment]` wrapper at once.
6411 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6412 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6413 * `priv` is disallowed everywhere except for struct fields and enum variants.
6414 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6415 * `ref` bindings in irrefutable patterns work correctly now.
6416 * `char` is now prevented from containing invalid code points.
6417 * Casting to `bool` is no longer allowed.
6418 * `\0` is now accepted as an escape in chars and strings.
6419 * `yield` is a reserved keyword.
6420 * `typeof` is a reserved keyword.
6421 * Crates may be imported by URL with `extern mod foo = "url";`.
6422 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6423 * Static vectors can be initialized with repeating elements,
6424 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6425 * Static structs can be initialized with functional record update,
6426 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6427 * `cfg!` can be used to conditionally execute code based on the crate
6428 configuration, similarly to `#[cfg(...)]`.
6429 * The `unnecessary_qualification` lint detects unneeded module
6430 prefixes (default: allow).
6431 * Arithmetic operations have been implemented on the SIMD types in
6432 `std::unstable::simd`.
6433 * Exchange allocation headers were removed, reducing memory usage.
6434 * `format!` implements a completely new, extensible, and higher-performance
6435 string formatting system. It will replace `fmt!`.
6436 * `print!` and `println!` write formatted strings (using the `format!`
6437 extension) to stdout.
6438 * `write!` and `writeln!` write formatted strings (using the `format!`
6439 extension) to the new Writers in `std::rt::io`.
6440 * The library section in which a function or static is placed may
6441 be specified with `#[link_section = "..."]`.
6442 * The `proto!` syntax extension for defining bounded message protocols
6444 * `macro_rules!` is hygienic for `let` declarations.
6445 * The `#[export_name]` attribute specifies the name of a symbol.
6446 * `unreachable!` can be used to indicate unreachable code, and fails
6450 * std: Transitioned to the new runtime, written in Rust.
6451 * std: Added an experimental I/O library, `rt::io`, based on the new
6453 * std: A new generic `range` function was added to the prelude, replacing
6454 `uint::range` and friends.
6455 * std: `range_rev` no longer exists. Since range is an iterator it can be
6456 reversed with `range(lo, hi).invert()`.
6457 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6458 renamed to `unwrap_or`.
6459 * std: The `iterator` module was renamed to `iter`.
6460 * std: Integral types now support the `checked_add`, `checked_sub`, and
6461 `checked_mul` operations for detecting overflow.
6462 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6464 * std: Methods are standardizing on conventions for casting methods:
6465 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6467 * std: The `CString` type in `c_str` provides new ways to convert to and
6469 * std: `DoubleEndedIterator` can yield elements in two directions.
6470 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6472 * std: `str::from_bytes` renamed to `str::from_utf8`.
6473 * std: `pop_opt` and `shift_opt` methods added to vectors.
6474 * std: The task-local data interface no longer uses @, and keys are
6475 no longer function pointers.
6476 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6477 * std: Added `SharedPort` to `comm`.
6478 * std: `Eq` has a default method for `ne`; only `eq` is required
6480 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6481 is required in implementations.
6482 * std: `is_utf8` performance is improved, impacting many string functions.
6483 * std: `os::MemoryMap` provides cross-platform mmap.
6484 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6485 are not 'in-bounds' are considered undefined.
6486 * std: Many freestanding functions in `vec` removed in favor of methods.
6487 * std: Many freestanding functions on scalar types removed in favor of
6489 * std: Many options to task builders were removed since they don't make
6490 sense in the new scheduler design.
6491 * std: More containers implement `FromIterator` so can be created by the
6493 * std: More complete atomic types in `unstable::atomics`.
6494 * std: `comm::PortSet` removed.
6495 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6496 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6497 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6498 default implementations.
6499 * std: Various `from_str` functions were removed in favor of a generic
6500 `from_str` which is available in the prelude.
6501 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6502 * extra: `dlist`, the doubly-linked list was modernized.
6503 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6504 * extra: Added `glob` module, replacing `std::os::glob`.
6505 * extra: `rope` was removed.
6506 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6507 * extra: `net`, and `timer` were removed. The experimental replacements
6508 are `std::rt::io::net` and `std::rt::io::timer`.
6509 * extra: Iterators implemented for `SmallIntMap`.
6510 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6511 * extra: `SmallIntSet` removed. Use `BitvSet`.
6512 * extra: Performance of JSON parsing greatly improved.
6513 * extra: `semver` updated to SemVer 2.0.0.
6514 * extra: `term` handles more terminals correctly.
6515 * extra: `dbg` module removed.
6516 * extra: `par` module removed.
6517 * extra: `future` was cleaned up, with some method renames.
6518 * extra: Most free functions in `getopts` were converted to methods.
6521 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6522 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6523 similarly to gcc's `--march` flag.
6524 * rustc's performance compiling small crates is much better.
6525 * rustpkg has received many improvements.
6526 * rustpkg supports git tags as package IDs.
6527 * rustpkg builds into target-specific directories so it can be used for
6529 * The number of concurrent test tasks is controlled by the environment
6530 variable RUST_TEST_TASKS.
6531 * The test harness can now report metrics for benchmarks.
6532 * All tools have man pages.
6533 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6534 * The runtime uses jemalloc for allocations.
6535 * Segmented stacks are temporarily disabled as part of the transition to
6536 the new runtime. Stack overflows are possible!
6537 * A new documentation backend, rustdoc_ng, is available for use. It is
6538 still invoked through the normal `rustdoc` command.
6541 Version 0.7 (2013-07-03)
6542 =======================
6544 * ~2000 changes, numerous bugfixes
6547 * `impl`s no longer accept a visibility qualifier. Put them on methods
6549 * The borrow checker has been rewritten with flow-sensitivity, fixing
6550 many bugs and inconveniences.
6551 * The `self` parameter no longer implicitly means `&'self self`,
6552 and can be explicitly marked with a lifetime.
6553 * Overloadable compound operators (`+=`, etc.) have been temporarily
6554 removed due to bugs.
6555 * The `for` loop protocol now requires `for`-iterators to return `bool`
6556 so they compose better.
6557 * The `Durable` trait is replaced with the `'static` bounds.
6558 * Trait default methods work more often.
6559 * Structs with the `#[packed]` attribute have byte alignment and
6560 no padding between fields.
6561 * Type parameters bound by `Copy` must now be copied explicitly with
6563 * It is now illegal to move out of a dereferenced unsafe pointer.
6564 * `Option<~T>` is now represented as a nullable pointer.
6565 * `@mut` does dynamic borrow checks correctly.
6566 * The `main` function is only detected at the topmost level of the crate.
6567 The `#[main]` attribute is still valid anywhere.
6568 * Struct fields may no longer be mutable. Use inherited mutability.
6569 * The `#[no_send]` attribute makes a type that would otherwise be
6571 * The `#[no_freeze]` attribute makes a type that would otherwise be
6573 * Unbounded recursion will abort the process after reaching the limit
6574 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6575 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6576 are never implicitly copyable.
6577 * `#[static_assert]` makes compile-time assertions about static bools.
6578 * At long last, 'argument modes' no longer exist.
6579 * The rarely used `use mod` statement no longer exists.
6582 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6584 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6585 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6587 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6588 and unsuffixed integer literals.
6591 * The `core` crate was renamed to `std`.
6592 * The `std` crate was renamed to `extra`.
6593 * More and improved documentation.
6594 * std: `iterator` module for external iterator objects.
6595 * Many old-style (internal, higher-order function) iterators replaced by
6596 implementations of `Iterator`.
6597 * std: Many old internal vector and string iterators,
6598 incl. `any`, `all`. removed.
6599 * std: The `finalize` method of `Drop` renamed to `drop`.
6600 * std: The `drop` method now takes `&mut self` instead of `&self`.
6601 * std: The prelude no longer re-exports any modules, only types and traits.
6602 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6603 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6604 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6605 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6606 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6607 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6608 * std: Many types implement `Clone`.
6609 * std: `path` type renamed to `Path`.
6610 * std: `mut` module and `Mut` type removed.
6611 * std: Many standalone functions removed in favor of methods and iterators
6612 in `vec`, `str`. In the future methods will also work as functions.
6613 * std: `reinterpret_cast` removed. Use `transmute`.
6614 * std: ascii string handling in `std::ascii`.
6615 * std: `Rand` is implemented for ~/@.
6616 * std: `run` module for spawning processes overhauled.
6617 * std: Various atomic types added to `unstable::atomic`.
6618 * std: Various types implement `Zero`.
6619 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6620 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6621 * std: Added `os::mkdir_recursive`.
6622 * std: Added `os::glob` function performs filesystems globs.
6623 * std: `FuzzyEq` renamed to `ApproxEq`.
6624 * std: `Map` now defines `pop` and `swap` methods.
6625 * std: `Cell` constructors converted to static methods.
6626 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6627 * extra: `flate` module moved from `std` to `extra`.
6628 * extra: `fileinput` module for iterating over a series of files.
6629 * extra: `Complex` number type and `complex` module.
6630 * extra: `Rational` number type and `rational` module.
6631 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6632 * extra: `term` uses terminfo now, is more correct.
6633 * extra: `arc` functions converted to methods.
6634 * extra: Implementation of fixed output size variations of SHA-2.
6637 * `unused_variable` lint mode for unused variables (default: warn).
6638 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6640 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6642 * `dead_assignment` lint mode for unread variables (default: warn).
6643 * `unnecessary_allocation` lint mode detects some heap allocations that are
6644 immediately borrowed so could be written without allocating (default: warn).
6645 * `missing_doc` lint mode (default: allow).
6646 * `unreachable_code` lint mode (default: warn).
6647 * The `rusti` command has been rewritten and a number of bugs addressed.
6648 * rustc outputs in color on more terminals.
6649 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6650 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6651 * Compiling with `-g` will make the binary record information about
6652 dynamic borrowcheck failures for debugging.
6653 * rustdoc has a nicer stylesheet.
6654 * Various improvements to rustdoc.
6655 * Improvements to rustpkg (see the detailed release notes).
6658 Version 0.6 (2013-04-03)
6659 ========================
6661 * ~2100 changes, numerous bugfixes
6664 * The self type parameter in traits is now spelled `Self`
6665 * The `self` parameter in trait and impl methods must now be explicitly
6666 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6667 * Static methods no longer require the `static` keyword and instead
6668 are distinguished by the lack of a `self` parameter
6669 * Replaced the `Durable` trait with the `'static` lifetime
6670 * The old closure type syntax with the trailing sigil has been
6671 removed in favor of the more consistent leading sigil
6672 * `super` is a keyword, and may be prefixed to paths
6673 * Trait bounds are separated with `+` instead of whitespace
6674 * Traits are implemented with `impl Trait for Type`
6675 instead of `impl Type: Trait`
6676 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6677 * The `export` keyword has finally been removed
6678 * The `move` keyword has been removed (see "Semantic changes")
6679 * The interior mutability qualifier on vectors, `[mut T]`, has been
6680 removed. Use `&mut [T]`, etc.
6681 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6682 * `fail` is no longer a keyword. Use `fail!()`
6683 * `assert` is no longer a keyword. Use `assert!()`
6684 * `log` is no longer a keyword. use `debug!`, etc.
6685 * 1-tuples may be represented as `(T,)`
6686 * Struct fields may no longer be `mut`. Use inherited mutability,
6687 `@mut T`, `core::mut` or `core::cell`
6688 * `extern mod { ... }` is no longer valid syntax for foreign
6689 function modules. Use extern blocks: `extern { ... }`
6690 * Newtype enums removed. Use tuple-structs.
6691 * Trait implementations no longer support visibility modifiers
6692 * Pattern matching over vectors improved and expanded
6693 * `const` renamed to `static` to correspond to lifetime name,
6694 and make room for future `static mut` unsafe mutable globals.
6695 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6696 * `Clone` implementations can be automatically generated with
6697 `#[deriving(Clone)]`
6698 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6699 instead of `foo as Bar`.
6700 * Fixed length vector types are now written as `[int, .. 3]`
6701 instead of `[int * 3]`.
6702 * Fixed length vector types can express the length as a constant
6703 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6706 * Types with owned pointers or custom destructors move by default,
6707 eliminating the `move` keyword
6708 * All foreign functions are considered unsafe
6709 * &mut is now unaliasable
6710 * Writes to borrowed @mut pointers are prevented dynamically
6712 * The name of the main function can be customized using #[main]
6713 * The default type of an inferred closure is &fn instead of @fn
6714 * `use` statements may no longer be "chained" - they cannot import
6715 identifiers imported by previous `use` statements
6716 * `use` statements are crate relative, importing from the "top"
6717 of the crate by default. Paths may be prefixed with `super::`
6718 or `self::` to change the search behavior.
6719 * Method visibility is inherited from the implementation declaration
6720 * Structural records have been removed
6721 * Many more types can be used in static items, including enums
6722 'static-lifetime pointers and vectors
6723 * Pattern matching over vectors improved and expanded
6724 * Typechecking of closure types has been overhauled to
6725 improve inference and eliminate unsoundness
6726 * Macros leave scope at the end of modules, unless that module is
6727 tagged with #[macro_escape]
6730 * Added big integers to `std::bigint`
6731 * Removed `core::oldcomm` module
6732 * Added pipe-based `core::comm` module
6733 * Numeric traits have been reorganized under `core::num`
6734 * `vec::slice` finally returns a slice
6735 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6736 * Containers reorganized around traits in `core::container`
6737 * `core::dvec` removed, `~[T]` is a drop-in replacement
6738 * `core::send_map` renamed to `core::hashmap`
6739 * `std::map` removed; replaced with `core::hashmap`
6740 * `std::treemap` reimplemented as an owned balanced tree
6741 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6742 * `core::trie` added as a fast ordered map for integer keys
6743 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6744 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6745 overload the comparison operators, whereas `TotalOrd` is used
6746 by certain container types
6749 * Replaced the 'cargo' package manager with 'rustpkg'
6750 * Added all-purpose 'rust' tool
6751 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6752 * rustc now *attempts* to offer spelling suggestions
6753 * Improved support for ARM and Android
6754 * Preliminary MIPS backend
6755 * Improved foreign function ABI implementation for x86, x86_64
6756 * Various memory usage improvements
6757 * Rust code may be embedded in foreign code under limited circumstances
6758 * Inline assembler supported by new asm!() syntax extension.
6761 Version 0.5 (2012-12-21)
6762 ===========================
6764 * ~900 changes, numerous bugfixes
6767 * Removed `<-` move operator
6768 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6769 * Removed old fixed length vector syntax - `[T]/N`
6770 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6771 * Macros may now expand to items and statements
6772 * `a.b()` is always parsed as a method call, never as a field projection
6773 * `Eq` and `IterBytes` implementations can be automatically generated
6774 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6775 * Removed the special crate language for `.rc` files
6776 * Function arguments may consist of any irrefutable pattern
6779 * `&` and `~` pointers may point to objects
6780 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6781 * Enum variants may be structs
6782 * Destructors can be added to all nominal types with the Drop trait
6783 * Structs and nullary enum variants may be constants
6784 * Values that cannot be implicitly copied are now automatically moved
6785 without writing `move` explicitly
6786 * `&T` may now be coerced to `*T`
6787 * Coercions happen in `let` statements as well as function calls
6788 * `use` statements now take crate-relative paths
6789 * The module and type namespaces have been merged so that static
6790 method names can be resolved under the trait in which they are
6793 * Improved support for language features
6794 * Trait inheritance works in many scenarios
6795 * More support for explicit self arguments in methods - `self`, `&self`
6796 `@self`, and `~self` all generally work as expected
6797 * Static methods work in more situations
6798 * Experimental: Traits may declare default methods for the implementations
6802 * New condition handling system in `core::condition`
6803 * Timsort added to `std::sort`
6804 * New priority queue, `std::priority_queue`
6805 * Pipes for serializable types, `std::flatpipes'
6806 * Serialization overhauled to be trait-based
6807 * Expanded `getopts` definitions
6808 * Moved futures to `std`
6809 * More functions are pure now
6810 * `core::comm` renamed to `oldcomm`. Still deprecated
6811 * `rustdoc` and `cargo` are libraries now
6814 * Added a preliminary REPL, `rusti`
6815 * License changed from MIT to dual MIT/APL2
6818 Version 0.4 (2012-10-15)
6819 ==========================
6821 * ~2000 changes, numerous bugfixes
6824 * All keywords are now strict and may not be used as identifiers anywhere
6825 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6826 'of', 'with', 'to', 'class'.
6827 * Classes are replaced with simpler structs
6828 * Explicit method self types
6829 * `ret` became `return` and `alt` became `match`
6830 * `import` is now `use`; `use is now `extern mod`
6831 * `extern mod { ... }` is now `extern { ... }`
6832 * `use mod` is the recommended way to import modules
6833 * `pub` and `priv` replace deprecated export lists
6834 * The syntax of `match` pattern arms now uses fat arrow (=>)
6835 * `main` no longer accepts an args vector; use `os::args` instead
6838 * Trait implementations are now coherent, ala Haskell typeclasses
6839 * Trait methods may be static
6840 * Argument modes are deprecated
6841 * Borrowed pointers are much more mature and recommended for use
6842 * Strings and vectors in the static region are stored in constant memory
6843 * Typestate was removed
6844 * Resolution rewritten to be more reliable
6845 * Support for 'dual-mode' data structures (freezing and thawing)
6848 * Most binary operators can now be overloaded via the traits in
6850 * `std::net::url` for representing URLs
6851 * Sendable hash maps in `core::send_map`
6852 * `core::task' gained a (currently unsafe) task-local storage API
6855 * An efficient new intertask communication primitive called the pipe,
6856 along with a number of higher-level channel types, in `core::pipes`
6857 * `std::arc`, an atomically reference counted, immutable, shared memory
6859 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6860 * Futures are now based on pipes and sendable
6861 * More robust linked task failure
6862 * Improved task builder API
6865 * Improved error reporting
6866 * Preliminary JIT support
6867 * Preliminary work on precise GC
6868 * Extensive architectural improvements to rustc
6869 * Begun a transition away from buggy C++-based reflection (shape) code to
6870 Rust-based (visitor) code
6871 * All hash functions and tables converted to secure, randomized SipHash
6874 Version 0.3 (2012-07-12)
6875 ========================
6877 * ~1900 changes, numerous bugfixes
6879 * New coding conveniences
6880 * Integer-literal suffix inference
6881 * Per-item control over warnings, errors
6882 * #[cfg(windows)] and #[cfg(unix)] attributes
6883 * Documentation comments
6884 * More compact closure syntax
6885 * 'do' expressions for treating higher-order functions as
6887 * *-patterns (wildcard extended to all constructor fields)
6890 * Name resolution pass and exhaustiveness checker rewritten
6891 * Region pointers and borrow checking supersede alias
6893 * Init-ness checking is now provided by a region-based liveness
6894 pass instead of the typestate pass; same for last-use analysis
6895 * Extensive work on region pointers
6897 * Experimental new language features
6898 * Slices and fixed-size, interior-allocated vectors
6899 * #!-comments for lang versioning, shell execution
6900 * Destructors and iface implementation for classes;
6901 type-parameterized classes and class methods
6902 * 'const' type kind for types that can be used to implement
6903 shared-memory concurrency patterns
6907 * Removal of various obsolete features
6908 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6909 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6911 * Constructs: do-while loops ('do' repurposed), fn binding,
6912 resources (replaced by destructors)
6914 * Compiler reorganization
6915 * Syntax-layer of compiler split into separate crate
6916 * Clang (from LLVM project) integrated into build
6917 * Typechecker split into sub-modules
6920 * New time functions
6921 * Extension methods for many built-in types
6922 * Arc: atomic-refcount read-only / exclusive-use shared cells
6923 * Par: parallel map and search routines
6924 * Extensive work on libuv interface
6925 * Much vector code moved to libraries
6926 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6927 #include, #include_str, #include_bin
6930 * Cargo automatically resolves dependencies
6933 Version 0.2 (2012-03-29)
6934 =========================
6936 * >1500 changes, numerous bugfixes
6938 * New docs and doc tooling
6940 * New port: FreeBSD x86_64
6942 * Compilation model enhancements
6943 * Generics now specialized, multiply instantiated
6944 * Functions now inlined across separate crates
6946 * Scheduling, stack and threading fixes
6947 * Noticeably improved message-passing performance
6948 * Explicit schedulers
6952 * Experimental new language features
6953 * Operator overloading
6957 * Various language extensions
6958 * C-callback function types: 'crust fn ...'
6959 * Infinite-loop construct: 'loop { ... }'
6960 * Shorten 'mutable' to 'mut'
6961 * Required mutable-local qualifier: 'let mut ...'
6962 * Basic glob-exporting: 'export foo::*;'
6963 * Alt now exhaustive, 'alt check' for runtime-checked
6964 * Block-function form of 'for' loop, with 'break' and 'ret'.
6967 * AST quasi-quote syntax extension
6968 * Revived libuv interface
6969 * New modules: core::{future, iter}, std::arena
6970 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6971 * Extensive cleanup, regularization in libstd, libcore
6974 Version 0.1 (2012-01-20)
6975 ===============================
6977 * Most language features work, including:
6978 * Unique pointers, unique closures, move semantics
6979 * Interface-constrained generics
6980 * Static interface dispatch
6982 * Multithread task scheduling
6983 * Typestate predicates
6984 * Failure unwinding, destructors
6985 * Pattern matching and destructuring assignment
6986 * Lightweight block-lambda syntax
6987 * Preliminary macro-by-example
6989 * Compiler works with the following configurations:
6990 * Linux: x86 and x86_64 hosts and targets
6991 * macOS: x86 and x86_64 hosts and targets
6992 * Windows: x86 hosts and targets
6994 * Cross compilation / multi-target configuration supported.
6996 * Preliminary API-documentation and package-management tools included.
7000 * Documentation is incomplete.
7002 * Performance is below intended target.
7004 * Standard library APIs are subject to extensive change, reorganization.
7006 * Language-level versioning is not yet operational - future code will