1 Version 1.30.0 (2018-10-25)
2 ==========================
6 - [Procedural macros are now available.][52081] These kinds of macros allow for
7 more powerful code generation, there is a [new chapter available][proc-macros]
8 in Rust Programming Language book that goes further in depth.
9 - [You can now use keywords as identifiers using the raw identifiers
10 syntax (`r#`).][53236] e.g. `let r#bool = true;`
11 - [Using anonymous parameters in traits is now deprecated with a warning and
12 will be a hard error in the 2018 edition.][53272]
13 - [You can now use `crate` in paths.][54404] This allows you to refer to the
14 crate root in the path. e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
15 - [Using a external crate now no longer requires being prefixed with `::`.][54404]
16 e.g. previously using a external crate in a module without a use statement
17 required `let json = ::serde_json::from_str(foo);` can now be written
18 as `let json = serde_json::from_str(foo);`.
19 - [You can now apply the `#[used]` attribute to static items to prevent the
20 compiler from optimising them away even if they appear to be unused.][51363]
21 e.g. `#[used] static FOO: u32 = 1;`
22 - [You can now import and reexport macros from other crates with the `use`
23 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
24 the root module of the crate. If your macro relies on calling other local
25 macros it is recommended to export with the
26 `#[macro_export(local_inner_macros)]` attribute so that users won't have to
28 - [`mod.rs` files are now optional.][54146] Previously if you had a `foo` module
29 with a `bar` submodule, you would have `src/foo/mod.rs` and `src/foo/bar.rs`.
30 Now you can have `src/foo.rs` and `src/foo/bar.rs` to achieve the same effect.
31 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
32 using the `vis` specifier.][53370]
33 - [Non-macro attributes now allow all forms of literals not just
34 strings.][53044] e.g. Previously you would write `#[attr("true")]` you can now
35 write `#[attr(true)]`.
36 - [You can now specify a function to handle a panic in the Rust runtime with the
37 `#[panic_handler]` attribute.][51366]
41 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
42 - [Added the `aarch64-unknown-netbsd` target][53165]
46 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
50 - [`Ipv4Addr::BROADCAST`]
51 - [`Ipv4Addr::LOCALHOST`]
52 - [`Ipv4Addr::UNSPECIFIED`]
53 - [`Ipv6Addr::LOCALHOST`]
54 - [`Ipv6Addr::UNSPECIFIED`]
55 - [`Iterator::find_map`]
57 The following methods are a replacement methods for `trim_left`, `trim_right`,
58 `trim_left_matches`, and `trim_right_matches`. Which will be deprecated
60 - [`str::trim_end_matches`]
62 - [`str::trim_start_matches`]
67 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
68 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
69 equivalent to calling `rustdoc --error-format=json`.
70 - [You can specify which edition to create a project in cargo
71 with `cargo new --edition`.][cargo/5984] Currently only `2015` is a
73 - [Cargo will now provide a progress bar for builds.][cargo/5995]
77 - [`rustdoc` allows you to specify what edition to treat your code as with the
78 `--edition` option.][54057]
79 - [`rustdoc` now has the `--color` (Specify whether to output color) and
80 `--error-format` (Specify error format e.g. `json`) options.][53003]
81 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
82 debug symbols.][53774]
83 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
84 available.][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
86 [50911]: https://github.com/rust-lang/rust/pull/50911/
87 [51363]: https://github.com/rust-lang/rust/pull/51363/
88 [51366]: https://github.com/rust-lang/rust/pull/51366/
89 [52081]: https://github.com/rust-lang/rust/pull/52081/
90 [53003]: https://github.com/rust-lang/rust/pull/53003/
91 [53033]: https://github.com/rust-lang/rust/pull/53033/
92 [53044]: https://github.com/rust-lang/rust/pull/53044/
93 [53165]: https://github.com/rust-lang/rust/pull/53165/
94 [53213]: https://github.com/rust-lang/rust/pull/53213/
95 [53236]: https://github.com/rust-lang/rust/pull/53236/
96 [53272]: https://github.com/rust-lang/rust/pull/53272/
97 [53370]: https://github.com/rust-lang/rust/pull/53370/
98 [53459]: https://github.com/rust-lang/rust/pull/53459/
99 [53774]: https://github.com/rust-lang/rust/pull/53774/
100 [53822]: https://github.com/rust-lang/rust/pull/53822/
101 [54057]: https://github.com/rust-lang/rust/pull/54057/
102 [54146]: https://github.com/rust-lang/rust/pull/54146/
103 [54404]: https://github.com/rust-lang/rust/pull/54404/
104 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
105 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
106 [cargo/5984]: https://github.com/rust-lang/cargo/pull/5984/
107 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
108 [proc-macros]: https://doc.rust-lang.org/book/2018-edition/ch19-06-macros.html
110 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
111 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
112 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
113 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
114 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
115 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
116 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
117 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
118 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
119 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
122 Version 1.29.2 (2018-10-11)
123 ===========================
125 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
126 - The `rls-preview` component on the windows-gnu targets has been restored.
128 [54639]: https://github.com/rust-lang/rust/pull/54639
131 Version 1.29.1 (2018-09-25)
132 ===========================
137 - The standard library's `str::repeat` function contained an out of bounds write
138 caused by an integer overflow. This has been fixed by deterministically
139 panicking when an overflow happens.
141 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
145 Version 1.29.0 (2018-09-13)
146 ==========================
150 - [Bumped minimum LLVM version to 5.0.][51899]
151 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
152 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
156 - [`Once::call_once` now no longer requires `Once` to be `'static`.][52239]
157 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
158 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
159 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
161 - [`Cell<T>` now allows `T` to be unsized.][50494]
162 - [`SocketAddr` is now stable on Redox.][52656]
167 - [`Iterator::flatten`]
172 - [Cargo can silently fix some bad lockfiles ][cargo/5831] You can use
173 `--locked` to disable this behaviour.
174 - [`cargo-install` will now allow you to cross compile an install
175 using `--target`][cargo/5614]
176 - [Added the `cargo-fix` subcommand to automatically move project code from
177 2015 edition to 2018.][cargo/5723]
178 - [`cargo doc` can now optionally document private types using the
179 `--document-private-items` flag.][cargo/5543]
183 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
184 the specified level to that level.][52354] For example `--cap-lints warn`
185 will demote `deny` and `forbid` lints to `warn`.
186 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
187 fails, and `101` if there is a panic.][52197]
188 - [A preview of clippy has been made available through rustup.][51122]
189 You can install the preview with `rustup component add clippy-preview`
193 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
194 Use `str::get_unchecked(begin..end)` instead.
195 - [`std::env::home_dir` is now deprecated for its unintuitive behaviour.][51656]
196 Consider using the `home_dir` function from
197 https://crates.io/crates/dirs instead.
198 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
199 - [`cfg` attributes and `--cfg` command line flags are now more
200 strictly validated.][53893]
202 [53893]: https://github.com/rust-lang/rust/pull/53893/
203 [52861]: https://github.com/rust-lang/rust/pull/52861/
204 [52656]: https://github.com/rust-lang/rust/pull/52656/
205 [52239]: https://github.com/rust-lang/rust/pull/52239/
206 [52330]: https://github.com/rust-lang/rust/pull/52330/
207 [52354]: https://github.com/rust-lang/rust/pull/52354/
208 [52402]: https://github.com/rust-lang/rust/pull/52402/
209 [52103]: https://github.com/rust-lang/rust/pull/52103/
210 [52197]: https://github.com/rust-lang/rust/pull/52197/
211 [51807]: https://github.com/rust-lang/rust/pull/51807/
212 [51899]: https://github.com/rust-lang/rust/pull/51899/
213 [51912]: https://github.com/rust-lang/rust/pull/51912/
214 [51511]: https://github.com/rust-lang/rust/pull/51511/
215 [51619]: https://github.com/rust-lang/rust/pull/51619/
216 [51656]: https://github.com/rust-lang/rust/pull/51656/
217 [51178]: https://github.com/rust-lang/rust/pull/51178/
218 [51122]: https://github.com/rust-lang/rust/pull/51122
219 [50494]: https://github.com/rust-lang/rust/pull/50494/
220 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
221 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
222 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
223 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
224 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
225 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
226 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
229 Version 1.28.0 (2018-08-02)
230 ===========================
234 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
235 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
236 the inner type across Foreign Function Interface (FFI) boundaries.
237 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
238 and can now be used as identifiers.][51196]
239 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
240 stable.][51241] This will allow users to specify a global allocator for
242 - [Unit test functions marked with the `#[test]` attribute can now return
243 `Result<(), E: Debug>` in addition to `()`.][51298]
244 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
245 allows macros to easily target lifetimes.
249 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
250 prioritise making smaller binary sizes. `z` is the same as `s` with the
251 exception that it does not vectorise loops, which typically results in an even
253 - [The short error format is now stable.][49546] Specified with
254 `--error-format=short` this option will provide a more compressed output of
256 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
257 - [Reduced the number of allocations in the macro parser.][50855] This can
258 improve compile times of macro heavy crates on average by 5%.
262 - [Implemented `Default` for `&mut str`.][51306]
263 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
264 - [Implemented `Extend` for `()`.][50234]
265 - [The `Debug` implementation of `time::Duration` should now be more easily
266 human readable.][50364] Previously a `Duration` of one second would printed as
267 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
268 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
269 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
270 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
271 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
272 for `PathBuf`.][50170]
273 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
274 and `Wrapping<i128>`.][50465]
275 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
276 possible.][51050] This can provide up to a 40% speed increase.
277 - [Improved error messages when using `format!`.][50610]
281 - [`Iterator::step_by`]
282 - [`Path::ancestors`]
283 - [`SystemTime::UNIX_EPOCH`]
284 - [`alloc::GlobalAlloc`]
286 - [`alloc::LayoutErr`]
289 - [`alloc::alloc_zeroed`]
292 - [`alloc::handle_alloc_error`]
293 - [`btree_map::Entry::or_default`]
295 - [`hash_map::Entry::or_default`]
296 - [`iter::repeat_with`]
297 - [`num::NonZeroUsize`]
298 - [`num::NonZeroU128`]
299 - [`num::NonZeroU16`]
300 - [`num::NonZeroU32`]
301 - [`num::NonZeroU64`]
303 - [`ops::RangeBounds`]
304 - [`slice::SliceIndex`]
305 - [`slice::from_mut`]
306 - [`slice::from_ref`]
307 - [`{Any + Send + Sync}::downcast_mut`]
308 - [`{Any + Send + Sync}::downcast_ref`]
309 - [`{Any + Send + Sync}::is`]
313 - [Cargo will now no longer allow you to publish crates with build scripts that
314 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
315 considered to be immutable.
319 - [The `suggestion_applicability` field in `rustc`'s json output is now
320 stable.][50486] This will allow dev tools to check whether a code suggestion
325 - [Rust will consider trait objects with duplicated constraints to be the same
326 type as without the duplicated constraint.][51276] For example the below code will
332 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
335 impl Trait + Send + Send {
336 fn test(&self) { println!("two"); }
340 [49546]: https://github.com/rust-lang/rust/pull/49546/
341 [50143]: https://github.com/rust-lang/rust/pull/50143/
342 [50170]: https://github.com/rust-lang/rust/pull/50170/
343 [50234]: https://github.com/rust-lang/rust/pull/50234/
344 [50265]: https://github.com/rust-lang/rust/pull/50265/
345 [50364]: https://github.com/rust-lang/rust/pull/50364/
346 [50385]: https://github.com/rust-lang/rust/pull/50385/
347 [50465]: https://github.com/rust-lang/rust/pull/50465/
348 [50486]: https://github.com/rust-lang/rust/pull/50486/
349 [50554]: https://github.com/rust-lang/rust/pull/50554/
350 [50610]: https://github.com/rust-lang/rust/pull/50610/
351 [50855]: https://github.com/rust-lang/rust/pull/50855/
352 [51050]: https://github.com/rust-lang/rust/pull/51050/
353 [51196]: https://github.com/rust-lang/rust/pull/51196/
354 [51200]: https://github.com/rust-lang/rust/pull/51200/
355 [51241]: https://github.com/rust-lang/rust/pull/51241/
356 [51276]: https://github.com/rust-lang/rust/pull/51276/
357 [51298]: https://github.com/rust-lang/rust/pull/51298/
358 [51306]: https://github.com/rust-lang/rust/pull/51306/
359 [51562]: https://github.com/rust-lang/rust/pull/51562/
360 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
361 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
362 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
363 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
364 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
365 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
366 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
367 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
368 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
369 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
370 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
371 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
372 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
373 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
374 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
375 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
376 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
377 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
378 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
379 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
380 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
381 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
382 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
383 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
384 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
385 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
386 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
387 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
388 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
389 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
391 Version 1.27.2 (2018-07-20)
392 ===========================
397 - The borrow checker was fixed to avoid potential unsoundness when using
398 match ergonomics: [#52213][52213].
400 [52213]: https://github.com/rust-lang/rust/issues/52213
402 Version 1.27.1 (2018-07-10)
403 ===========================
408 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
409 when running, which enabled executing code as some other user on a
410 given machine. This release fixes that vulnerability; you can read
411 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
413 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
418 - The borrow checker was fixed to avoid an additional potential unsoundness when using
419 match ergonomics: [#51415][51415], [#49534][49534].
421 [51415]: https://github.com/rust-lang/rust/issues/51415
422 [49534]: https://github.com/rust-lang/rust/issues/49534
423 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
424 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
426 Version 1.27.0 (2018-06-21)
427 ==========================
431 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
432 be used as an identifier.
433 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
434 bare `Trait` syntax, and should make it clearer when being used in tandem with
435 `impl Trait`. Since it is equivalent to the following syntax:
436 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
437 `Box<Trait> == Box<dyn Trait>`.
438 - [Attributes on generic parameters such as types and lifetimes are
439 now stable.][48851] e.g.
440 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
441 - [The `#[must_use]` attribute can now also be used on functions as well as
442 types.][48925] It provides a lint that by default warns users when the
443 value returned by a function has not been used.
447 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
451 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
452 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
453 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
454 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
456 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
457 std are now available in core.][49896]
458 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
460 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
461 that the operation isn't done in place.
462 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
463 the `#[must_use]` attribute][49533] to warn about unused potentially
464 expensive allocations.
468 - [`DoubleEndedIterator::rfind`]
469 - [`DoubleEndedIterator::rfold`]
470 - [`DoubleEndedIterator::try_rfold`]
471 - [`Duration::from_micros`]
472 - [`Duration::from_nanos`]
473 - [`Duration::subsec_micros`]
474 - [`Duration::subsec_millis`]
475 - [`HashMap::remove_entry`]
476 - [`Iterator::try_fold`]
477 - [`Iterator::try_for_each`]
480 - [`String::replace_range`]
481 - [`Take::set_limit`]
482 - [`hint::unreachable_unchecked`]
483 - [`os::unix::process::parent_id`]
484 - [`ptr::swap_nonoverlapping`]
485 - [`slice::rsplit_mut`]
487 - [`slice::swap_with_slice`]
491 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
492 `readme`, and `repository` fields.][cargo/5386]
493 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
494 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
495 a different directory than `target` for placing compilation artifacts.
496 - [Cargo will be adding automatic target inference for binaries, benchmarks,
497 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
498 specific targets e.g. using `[[bin]]` and have other binaries in locations
499 where cargo would infer a binary, Cargo will produce a warning. You can
500 disable this feature ahead of time by setting any of the following `autobins`,
501 `autobenches`, `autoexamples`, `autotests` to false.
502 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
503 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
507 - [Added “The Rustc book” into the official documentation.][49707]
508 [“The Rustc book”] documents and teaches how to use the rustc compiler.
509 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
513 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
514 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
515 compile, `"".is_empty()` will still compile.
516 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
517 will only print the inner type.][48553] e.g.
518 `print!("{:?}", AtomicBool::new(true))` will print `true`
519 not `AtomicBool(true)`.
520 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
521 could enter higher numbers but they were not supported by LLVM. Up to 512MB
522 alignment should cover all use cases.
523 - The `.description()` method on the `std::error::Error` trait
524 [has been soft-deprecated][50163]. It is no longer required to implement it.
526 [48553]: https://github.com/rust-lang/rust/pull/48553/
527 [48851]: https://github.com/rust-lang/rust/pull/48851/
528 [48925]: https://github.com/rust-lang/rust/pull/48925/
529 [49533]: https://github.com/rust-lang/rust/pull/49533/
530 [49623]: https://github.com/rust-lang/rust/pull/49623/
531 [49630]: https://github.com/rust-lang/rust/pull/49630/
532 [49664]: https://github.com/rust-lang/rust/pull/49664/
533 [49699]: https://github.com/rust-lang/rust/pull/49699/
534 [49707]: https://github.com/rust-lang/rust/pull/49707/
535 [49719]: https://github.com/rust-lang/rust/pull/49719/
536 [49896]: https://github.com/rust-lang/rust/pull/49896/
537 [49968]: https://github.com/rust-lang/rust/pull/49968/
538 [50163]: https://github.com/rust-lang/rust/pull/50163
539 [50177]: https://github.com/rust-lang/rust/pull/50177/
540 [50378]: https://github.com/rust-lang/rust/pull/50378/
541 [50398]: https://github.com/rust-lang/rust/pull/50398/
542 [50423]: https://github.com/rust-lang/rust/pull/50423/
543 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
544 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
545 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
546 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
547 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
548 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
549 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
550 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
551 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
552 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
553 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
554 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
555 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
556 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
557 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
558 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
559 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
560 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
561 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
562 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
563 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
564 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
565 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
566 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
567 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
568 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
569 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
570 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
571 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
572 [“The Rustc book”]: https://doc.rust-lang.org/rustc
575 Version 1.26.2 (2018-06-05)
576 ==========================
581 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics][51117]
583 [51117]: https://github.com/rust-lang/rust/issues/51117
586 Version 1.26.1 (2018-05-29)
587 ==========================
592 - [RLS now works on Windows][50646]
593 - [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
599 - [`fn main() -> impl Trait` no longer works for non-Termination
601 This reverts an accidental stabilization.
602 - [`NaN > NaN` no longer returns true in const-fn contexts][50812]
603 - [Prohibit using turbofish for `impl Trait` in method arguments][50950]
605 [50646]: https://github.com/rust-lang/rust/issues/50646
606 [50656]: https://github.com/rust-lang/rust/pull/50656
607 [50812]: https://github.com/rust-lang/rust/pull/50812
608 [50950]: https://github.com/rust-lang/rust/issues/50950
609 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
611 Version 1.26.0 (2018-05-10)
612 ==========================
616 - [Closures now implement `Copy` and/or `Clone` if all captured variables
617 implement either or both traits.][49299]
618 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
619 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere where a
620 lifetime can be elided.][49458]
621 - [`impl Trait` is now stable allowing you to have abstract types in returns
622 or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
623 `fn open(path: impl AsRef<Path>)`.
624 - [Pattern matching will now automatically apply dereferences.][49394]
625 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
626 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
627 - [A lot of operations are now available in a const context.][46882] E.g. You
628 can now index into constant arrays, reference and dereference into constants,
629 and use Tuple struct constructors.
630 - [Fixed entry slice patterns are now stable.][48516] e.g.
632 let points = [1, 2, 3, 4];
634 [1, 2, 3, 4] => println!("All points were sequential."),
635 _ => println!("Not all points were sequential."),
642 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
643 - [Fixed exponential projection complexity on nested types.][48296]
644 This can provide up to a ~12% reduction in compile times for certain crates.
645 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
646 to remap path prefixes outputted by the compiler.
647 - [Added `powerpc-unknown-netbsd` target.][48281]
651 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
652 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
653 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
654 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
655 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
656 - [`ascii::escape_default` is now available in libcore.][48735]
657 - [Trailing commas are now supported in std and core macros.][48056]
658 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
659 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
664 - [`*const T::copy_to_nonoverlapping`]
665 - [`*const T::copy_to`]
666 - [`*const T::read_unaligned`]
667 - [`*const T::read_volatile`]
670 - [`*const T::wrapping_add`]
671 - [`*const T::wrapping_sub`]
673 - [`*mut T::copy_to_nonoverlapping`]
674 - [`*mut T::copy_to`]
675 - [`*mut T::read_unaligned`]
676 - [`*mut T::read_volatile`]
678 - [`*mut T::replace`]
681 - [`*mut T::wrapping_add`]
682 - [`*mut T::wrapping_sub`]
683 - [`*mut T::write_bytes`]
684 - [`*mut T::write_unaligned`]
685 - [`*mut T::write_volatile`]
688 - [`FromUtf8Error::as_bytes`]
689 - [`LocalKey::try_with`]
691 - [`btree_map::Entry::and_modify`]
692 - [`fs::read_to_string`]
695 - [`hash_map::Entry::and_modify`]
696 - [`iter::FusedIterator`]
697 - [`ops::RangeInclusive`]
698 - [`ops::RangeToInclusive`]
700 - [`slice::rotate_left`]
701 - [`slice::rotate_right`]
707 - [Cargo will now output path to custom commands when `-v` is
708 passed with `--list`][cargo/5041]
709 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
713 - [The second edition of "The Rust Programming Language" book is now recommended
714 over the first.][48404]
719 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
720 syntax is now invalid.
722 use std::ops::Fn as dyn;
723 fn g(_: Box<dyn(std::fmt::Debug)>) {}
725 - [The result of dereferences are no longer promoted to `'static`.][47408]
729 const PAIR: &(i32, i32) = &(0, 1);
730 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
733 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
734 - [`".e0"` will now no longer parse as `0.0` and will instead cause
736 - [Removed hoedown from rustdoc.][48274]
737 - [Bounds on higher-kinded lifetimes a hard error.][48326]
739 [46882]: https://github.com/rust-lang/rust/pull/46882
740 [47379]: https://github.com/rust-lang/rust/pull/47379
741 [47408]: https://github.com/rust-lang/rust/pull/47408
742 [47813]: https://github.com/rust-lang/rust/pull/47813
743 [48056]: https://github.com/rust-lang/rust/pull/48056
744 [48125]: https://github.com/rust-lang/rust/pull/48125
745 [48166]: https://github.com/rust-lang/rust/pull/48166
746 [48235]: https://github.com/rust-lang/rust/pull/48235
747 [48274]: https://github.com/rust-lang/rust/pull/48274
748 [48281]: https://github.com/rust-lang/rust/pull/48281
749 [48296]: https://github.com/rust-lang/rust/pull/48296
750 [48326]: https://github.com/rust-lang/rust/pull/48326
751 [48359]: https://github.com/rust-lang/rust/pull/48359
752 [48404]: https://github.com/rust-lang/rust/pull/48404
753 [48481]: https://github.com/rust-lang/rust/pull/48481
754 [48516]: https://github.com/rust-lang/rust/pull/48516
755 [48628]: https://github.com/rust-lang/rust/pull/48628
756 [48629]: https://github.com/rust-lang/rust/pull/48629
757 [48657]: https://github.com/rust-lang/rust/pull/48657
758 [48735]: https://github.com/rust-lang/rust/pull/48735
759 [48978]: https://github.com/rust-lang/rust/pull/48978
760 [49101]: https://github.com/rust-lang/rust/pull/49101
761 [49109]: https://github.com/rust-lang/rust/pull/49109
762 [49121]: https://github.com/rust-lang/rust/pull/49121
763 [49162]: https://github.com/rust-lang/rust/pull/49162
764 [49184]: https://github.com/rust-lang/rust/pull/49184
765 [49234]: https://github.com/rust-lang/rust/pull/49234
766 [49255]: https://github.com/rust-lang/rust/pull/49255
767 [49299]: https://github.com/rust-lang/rust/pull/49299
768 [49305]: https://github.com/rust-lang/rust/pull/49305
769 [49394]: https://github.com/rust-lang/rust/pull/49394
770 [49458]: https://github.com/rust-lang/rust/pull/49458
771 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
772 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
773 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
774 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
775 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
776 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
777 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
778 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
779 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
780 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
781 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
782 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
783 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
784 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
785 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
786 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
787 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
788 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
789 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
790 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
791 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
792 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
793 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
794 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
795 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
796 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
797 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
798 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
799 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
800 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
801 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
802 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
803 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
804 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
805 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
806 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
807 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
808 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
809 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
810 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
811 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
812 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
815 Version 1.25.0 (2018-03-29)
816 ==========================
820 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
821 - [You can now use nested groups of imports.][47948]
822 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
823 - [You can now have `|` at the start of a match arm.][47947] e.g.
831 | Foo::B => println!("AB"),
832 | Foo::C => println!("C"),
839 - [Upgraded to LLVM 6.][47828]
840 - [Added `-C lto=val` option.][47521]
841 - [Added `i586-unknown-linux-musl` target][47282]
845 - [Impl Send for `process::Command` on Unix.][47760]
846 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
847 - [`UnsafeCell::into_inner` is now safe.][47204]
848 - [Implement libstd for CloudABI.][47268]
849 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
850 - [Implement `AsRef<Path>` for Component][46985]
851 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
852 - [Moved `Duration` to libcore.][46666]
856 - [`Location::column`]
859 The following functions can now be used in a constant expression.
860 eg. `static MINUTE: Duration = Duration::from_secs(60);`
861 - [`Duration::new`][47300]
862 - [`Duration::from_secs`][47300]
863 - [`Duration::from_millis`][47300]
867 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
868 - [`cargo new` now defaults to creating a binary crate, instead of a
869 library crate.][cargo/5029]
873 - [Rust by example is now shipped with new releases][46196]
877 - [Deprecated `net::lookup_host`.][47510]
878 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
879 - The borrow checker was sometimes incorrectly permitting overlapping borrows
880 around indexing operations (see [#47349][47349]). This has been fixed (which also
881 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
882 - [Removed deprecated unstable attribute `#[simd]`.][47251]
884 [33903]: https://github.com/rust-lang/rust/pull/33903
885 [47947]: https://github.com/rust-lang/rust/pull/47947
886 [47948]: https://github.com/rust-lang/rust/pull/47948
887 [47760]: https://github.com/rust-lang/rust/pull/47760
888 [47790]: https://github.com/rust-lang/rust/pull/47790
889 [47828]: https://github.com/rust-lang/rust/pull/47828
890 [47398]: https://github.com/rust-lang/rust/pull/47398
891 [47510]: https://github.com/rust-lang/rust/pull/47510
892 [47521]: https://github.com/rust-lang/rust/pull/47521
893 [47204]: https://github.com/rust-lang/rust/pull/47204
894 [47251]: https://github.com/rust-lang/rust/pull/47251
895 [47268]: https://github.com/rust-lang/rust/pull/47268
896 [47282]: https://github.com/rust-lang/rust/pull/47282
897 [47300]: https://github.com/rust-lang/rust/pull/47300
898 [47349]: https://github.com/rust-lang/rust/pull/47349
899 [46931]: https://github.com/rust-lang/rust/pull/46931
900 [46985]: https://github.com/rust-lang/rust/pull/46985
901 [47006]: https://github.com/rust-lang/rust/pull/47006
902 [46830]: https://github.com/rust-lang/rust/pull/46830
903 [46095]: https://github.com/rust-lang/rust/pull/46095
904 [46666]: https://github.com/rust-lang/rust/pull/46666
905 [46196]: https://github.com/rust-lang/rust/pull/46196
906 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
907 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
908 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
909 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
910 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
913 Version 1.24.1 (2018-03-01)
914 ==========================
916 - [Do not abort when unwinding through FFI][48251]
917 - [Emit UTF-16 files for linker arguments on Windows][48318]
918 - [Make the error index generator work again][48308]
919 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
921 [48251]: https://github.com/rust-lang/rust/issues/48251
922 [48308]: https://github.com/rust-lang/rust/issues/48308
923 [48318]: https://github.com/rust-lang/rust/issues/48318
924 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
927 Version 1.24.0 (2018-02-15)
928 ==========================
932 - [External `sysv64` ffi is now available.][46528]
933 eg. `extern "sysv64" fn foo () {}`
937 - [rustc now uses 16 codegen units by default for release builds.][46910]
938 For the fastest builds, utilize `codegen-units=1`.
939 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
940 - [Add `aarch64-unknown-openbsd` support][46760]
944 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
945 improvement in performance in the majority of cases.
946 - [`OsStr`'s `Debug` implementation is now lossless and consistent
947 with Windows.][46798]
948 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
949 - [impl `From<bool>` for `AtomicBool`][46293]
950 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
951 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
952 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
953 - [float::from_bits now just uses transmute.][46012] This provides
954 some optimisations from LLVM.
955 - [Copied `AsciiExt` methods onto `char`][46077]
956 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
957 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
958 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
959 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
963 - [`RefCell::replace`]
965 - [`atomic::spin_loop_hint`]
967 The following functions can now be used in a constant expression.
968 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
970 - [`AtomicBool::new`][46287]
971 - [`AtomicUsize::new`][46287]
972 - [`AtomicIsize::new`][46287]
973 - [`AtomicPtr::new`][46287]
974 - [`Cell::new`][46287]
975 - [`{integer}::min_value`][46287]
976 - [`{integer}::max_value`][46287]
977 - [`mem::size_of`][46287]
978 - [`mem::align_of`][46287]
979 - [`ptr::null`][46287]
980 - [`ptr::null_mut`][46287]
981 - [`RefCell::new`][46287]
982 - [`UnsafeCell::new`][46287]
986 - [Added a `workspace.default-members` config that
987 overrides implied `--all` in virtual workspaces.][cargo/4743]
988 - [Enable incremental by default on development builds.][cargo/4817] Also added
989 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
990 per-project or global basis respectively.
997 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
998 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
999 in accordance with IETF RFC 4291 §2.2.
1000 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1001 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1002 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1003 - [Leading zeros in tuple struct members is now an error][47084]
1004 - [`column!()` macro is one-based instead of zero-based][46977]
1005 - [`fmt::Arguments` can no longer be shared across threads][45198]
1006 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1007 - [Cargo sets a different working directory for the compiler][cargo/4788]
1009 [44884]: https://github.com/rust-lang/rust/pull/44884
1010 [45198]: https://github.com/rust-lang/rust/pull/45198
1011 [45506]: https://github.com/rust-lang/rust/pull/45506
1012 [45904]: https://github.com/rust-lang/rust/pull/45904
1013 [45990]: https://github.com/rust-lang/rust/pull/45990
1014 [46012]: https://github.com/rust-lang/rust/pull/46012
1015 [46077]: https://github.com/rust-lang/rust/pull/46077
1016 [46094]: https://github.com/rust-lang/rust/pull/46094
1017 [46284]: https://github.com/rust-lang/rust/pull/46284
1018 [46287]: https://github.com/rust-lang/rust/pull/46287
1019 [46293]: https://github.com/rust-lang/rust/pull/46293
1020 [46528]: https://github.com/rust-lang/rust/pull/46528
1021 [46671]: https://github.com/rust-lang/rust/pull/46671
1022 [46713]: https://github.com/rust-lang/rust/pull/46713
1023 [46735]: https://github.com/rust-lang/rust/pull/46735
1024 [46749]: https://github.com/rust-lang/rust/pull/46749
1025 [46760]: https://github.com/rust-lang/rust/pull/46760
1026 [46798]: https://github.com/rust-lang/rust/pull/46798
1027 [46828]: https://github.com/rust-lang/rust/pull/46828
1028 [46831]: https://github.com/rust-lang/rust/pull/46831
1029 [46833]: https://github.com/rust-lang/rust/pull/46833
1030 [46910]: https://github.com/rust-lang/rust/pull/46910
1031 [46977]: https://github.com/rust-lang/rust/pull/46977
1032 [47018]: https://github.com/rust-lang/rust/pull/47018
1033 [47080]: https://github.com/rust-lang/rust/pull/47080
1034 [47084]: https://github.com/rust-lang/rust/pull/47084
1035 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1036 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1037 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1038 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1039 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1040 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1043 Version 1.23.0 (2018-01-04)
1044 ==========================
1048 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1049 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1050 Which should fix some confusing errors in some operations.
1054 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1055 undefined behaviour.][45920]
1056 - [rustc now suggests renaming import if names clash.][45660]
1057 - [Display errors/warnings correctly when there are zero-width or
1058 wide characters.][45711]
1059 - [rustc now avoids unnecessary copies of arguments that are
1060 simple bindings][45380] This should improve memory usage on average by 5-10%.
1061 - [Updated musl used to build musl rustc to 1.1.17][45393]
1065 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1066 - [Implement Hash for raw pointers to unsized types][45483]
1067 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1068 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1069 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1070 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1071 and `<*mut T>::as_mut`][44932]
1072 - [Optimized `Thread::{park, unpark}` implementation][45524]
1073 - [Improved `SliceExt::binary_search` performance.][45333]
1074 - [impl `FromIterator<()>` for `()`][45379]
1075 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1083 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1084 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1085 - [Added unit test checking to `cargo check`][cargo/4592]
1086 - [Cargo now lets you install a specific version
1087 using `cargo install --version`][cargo/4637]
1091 - [Releases now ship with the Cargo book documentation.][45692]
1092 - [rustdoc now prints rendering warnings on every run.][45324]
1096 - [Changes have been made to type equality to make it more correct,
1097 in rare cases this could break some code.][45853] [Tracking issue for
1098 further information][45852]
1099 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1100 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1101 Android 9, the minimum supported version is Android 14.
1102 - [Bumped the minimum LLVM to 3.9][45326]
1104 [44042]: https://github.com/rust-lang/rust/pull/44042
1105 [44932]: https://github.com/rust-lang/rust/pull/44932
1106 [45267]: https://github.com/rust-lang/rust/pull/45267
1107 [45324]: https://github.com/rust-lang/rust/pull/45324
1108 [45326]: https://github.com/rust-lang/rust/pull/45326
1109 [45333]: https://github.com/rust-lang/rust/pull/45333
1110 [45379]: https://github.com/rust-lang/rust/pull/45379
1111 [45380]: https://github.com/rust-lang/rust/pull/45380
1112 [45393]: https://github.com/rust-lang/rust/pull/45393
1113 [45435]: https://github.com/rust-lang/rust/pull/45435
1114 [45483]: https://github.com/rust-lang/rust/pull/45483
1115 [45524]: https://github.com/rust-lang/rust/pull/45524
1116 [45571]: https://github.com/rust-lang/rust/pull/45571
1117 [45580]: https://github.com/rust-lang/rust/pull/45580
1118 [45610]: https://github.com/rust-lang/rust/pull/45610
1119 [45660]: https://github.com/rust-lang/rust/pull/45660
1120 [45692]: https://github.com/rust-lang/rust/pull/45692
1121 [45711]: https://github.com/rust-lang/rust/pull/45711
1122 [45772]: https://github.com/rust-lang/rust/pull/45772
1123 [45852]: https://github.com/rust-lang/rust/issues/45852
1124 [45853]: https://github.com/rust-lang/rust/pull/45853
1125 [45887]: https://github.com/rust-lang/rust/pull/45887
1126 [45920]: https://github.com/rust-lang/rust/pull/45920
1127 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1128 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1129 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1132 Version 1.22.1 (2017-11-22)
1133 ==========================
1135 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1137 [46183]: https://github.com/rust-lang/rust/pull/46183
1139 Version 1.22.0 (2017-11-22)
1140 ==========================
1144 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1145 - [Now accepts underscores in unicode escapes][43716]
1146 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1147 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1151 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1152 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1153 This should decrease compile times for debug builds.
1154 - [strict memory alignment now enabled on ARMv6][45094]
1155 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1159 - [Allow atomic operations up to 32 bits
1160 on `armv5te_unknown_linux_gnueabi`][44978]
1161 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1162 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1163 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1164 - [Properly detect overflow in `Instant += Duration`.][44220]
1165 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1166 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1167 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1174 - [Cargo will now build multi file examples in subdirectories of the `examples`
1175 folder that have a `main.rs` file.][cargo/4496]
1176 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1177 the old format will continue to work and can be updated with `cargo update`.
1178 - [Now supports vendoring git repositories][cargo/3992]
1182 - [`libbacktrace` is now available on Apple platforms.][44251]
1183 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1184 This now lets you specify that a given code example will fail to compile.
1188 - [The minimum Android version that rustc can build for has been bumped
1189 to `4.0` from `2.3`][45656]
1190 - [Allowing `T op= &T` for numeric types has broken some type
1191 inference cases][45480]
1194 [42526]: https://github.com/rust-lang/rust/pull/42526
1195 [43017]: https://github.com/rust-lang/rust/pull/43017
1196 [43716]: https://github.com/rust-lang/rust/pull/43716
1197 [43949]: https://github.com/rust-lang/rust/pull/43949
1198 [44015]: https://github.com/rust-lang/rust/pull/44015
1199 [44220]: https://github.com/rust-lang/rust/pull/44220
1200 [44251]: https://github.com/rust-lang/rust/pull/44251
1201 [44287]: https://github.com/rust-lang/rust/pull/44287
1202 [44303]: https://github.com/rust-lang/rust/pull/44303
1203 [44456]: https://github.com/rust-lang/rust/pull/44456
1204 [44466]: https://github.com/rust-lang/rust/pull/44466
1205 [44895]: https://github.com/rust-lang/rust/pull/44895
1206 [44966]: https://github.com/rust-lang/rust/pull/44966
1207 [44978]: https://github.com/rust-lang/rust/pull/44978
1208 [45041]: https://github.com/rust-lang/rust/pull/45041
1209 [45064]: https://github.com/rust-lang/rust/pull/45064
1210 [45075]: https://github.com/rust-lang/rust/pull/45075
1211 [45094]: https://github.com/rust-lang/rust/pull/45094
1212 [45095]: https://github.com/rust-lang/rust/pull/45095
1213 [45480]: https://github.com/rust-lang/rust/issues/45480
1214 [45656]: https://github.com/rust-lang/rust/pull/45656
1215 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1216 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1217 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1224 Version 1.21.0 (2017-10-12)
1225 ==========================
1229 - [You can now use static references for literals.][43838]
1233 let x: &'static u32 = &0;
1236 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1239 my_macro!(Vec<i32>::new); // Always worked
1240 my_macro!(Vec::<i32>::new); // Now works
1245 - [Upgraded jemalloc to 4.5.0][43911]
1246 - [Enabled unwinding panics on Redox][43917]
1247 - [Now runs LLVM in parallel during translation phase.][43506]
1248 This should reduce peak memory usage.
1252 - [Generate builtin impls for `Clone` for all arrays and tuples that
1253 are `T: Clone`][43690]
1254 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1255 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1256 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1261 [`std::mem::discriminant`]
1265 - [You can now call `cargo install` with multiple package names][cargo/4216]
1266 - [Cargo commands inside a virtual workspace will now implicitly
1267 pass `--all`][cargo/4335]
1268 - [Added a `[patch]` section to `Cargo.toml` to handle
1269 prepublication dependencies][cargo/4123] [RFC 1969]
1270 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1271 like patterns][cargo/4270]
1272 - [Added the `--all-targets` option][cargo/4400]
1273 - [Using required dependencies as a feature is now deprecated and emits
1274 a warning][cargo/4364]
1279 - [Cargo docs are moving][43916]
1280 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1281 - [The rustdoc book is now available][43863]
1282 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1283 - [Added a preview of RLS has been made available through rustup][44204]
1284 Install with `rustup component add rls-preview`
1285 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1286 Previously only showed `std::os::unix`.
1290 - [Changes in method matching against higher-ranked types][43880] This may cause
1291 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1292 - [rustc's JSON error output's byte position start at top of file.][42973]
1293 Was previously relative to the rustc's internal `CodeMap` struct which
1294 required the unstable library `libsyntax` to correctly use.
1295 - [`unused_results` lint no longer ignores booleans][43728]
1297 [42565]: https://github.com/rust-lang/rust/pull/42565
1298 [42973]: https://github.com/rust-lang/rust/pull/42973
1299 [43348]: https://github.com/rust-lang/rust/pull/43348
1300 [43459]: https://github.com/rust-lang/rust/pull/43459
1301 [43506]: https://github.com/rust-lang/rust/pull/43506
1302 [43540]: https://github.com/rust-lang/rust/pull/43540
1303 [43690]: https://github.com/rust-lang/rust/pull/43690
1304 [43728]: https://github.com/rust-lang/rust/pull/43728
1305 [43838]: https://github.com/rust-lang/rust/pull/43838
1306 [43863]: https://github.com/rust-lang/rust/pull/43863
1307 [43880]: https://github.com/rust-lang/rust/pull/43880
1308 [43911]: https://github.com/rust-lang/rust/pull/43911
1309 [43916]: https://github.com/rust-lang/rust/pull/43916
1310 [43917]: https://github.com/rust-lang/rust/pull/43917
1311 [44204]: https://github.com/rust-lang/rust/pull/44204
1312 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1313 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1314 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1315 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1316 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1317 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1318 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1319 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1320 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1322 Version 1.20.0 (2017-08-31)
1323 ===========================
1327 - [Associated constants are now stabilised.][42809]
1328 - [A lot of macro bugs are now fixed.][42913]
1333 - [Struct fields are now properly coerced to the expected field type.][42807]
1334 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1335 `wasm32-experimental-emscripten` target.
1336 - [Changed some of the error messages to be more helpful.][42033]
1337 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1339 - [rustc now reports the total number of errors on compilation failure][43015]
1340 previously this was only the number of errors in the pass that failed.
1341 - [Expansion in rustc has been sped up 29x.][42533]
1342 - [added `msp430-none-elf` target.][43099]
1343 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1345 - [Fixes backtraces on Redox][43228]
1346 - [rustc now identifies different versions of same crate when absolute paths of
1347 different types match in an error message.][42826]
1353 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1354 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1356 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1357 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1358 - [Impl `Clone` for `DefaultHasher`.][42799]
1359 - [Impl `Sync` for `SyncSender`.][42397]
1360 - [Impl `FromStr` for `char`][42271]
1361 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1363 - [allow messages in the `unimplemented!()` macro.][42155]
1364 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1365 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1366 - [Upgrade to Unicode 10.0.0][42999]
1367 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1368 - [Skip the main thread's manual stack guard on Linux][43072]
1369 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1370 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1372 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1377 - [`CStr::into_c_string`]
1378 - [`CString::as_c_str`]
1379 - [`CString::into_boxed_c_str`]
1380 - [`Chain::get_mut`]
1381 - [`Chain::get_ref`]
1382 - [`Chain::into_inner`]
1383 - [`Option::get_or_insert_with`]
1384 - [`Option::get_or_insert`]
1385 - [`OsStr::into_os_string`]
1386 - [`OsString::into_boxed_os_str`]
1389 - [`Utf8Error::error_len`]
1390 - [`char::EscapeDebug`]
1391 - [`char::escape_debug`]
1392 - [`compile_error!`]
1393 - [`f32::from_bits`]
1395 - [`f64::from_bits`]
1397 - [`mem::ManuallyDrop`]
1398 - [`slice::sort_unstable_by_key`]
1399 - [`slice::sort_unstable_by`]
1400 - [`slice::sort_unstable`]
1401 - [`str::from_boxed_utf8_unchecked`]
1402 - [`str::as_bytes_mut`]
1403 - [`str::as_bytes_mut`]
1404 - [`str::from_utf8_mut`]
1405 - [`str::from_utf8_unchecked_mut`]
1407 - [`str::get_unchecked_mut`]
1408 - [`str::get_unchecked`]
1410 - [`str::into_boxed_bytes`]
1415 - [Cargo API token location moved from `~/.cargo/config` to
1416 `~/.cargo/credentials`.][cargo/3978]
1417 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1418 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1419 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1420 - [You can now specify version of a binary when installed through
1421 `cargo install` using `--vers`.][cargo/4229]
1422 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1423 failure.][cargo/4248]
1424 - [Changed the convention around which file is the crate root.][cargo/4259]
1425 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1426 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1431 - [Functions with `'static` in their return types will now not be as usable as
1432 if they were using lifetime parameters instead.][42417]
1433 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1434 takes the sign of NaN into account where previously didn't.][42430]
1436 [42033]: https://github.com/rust-lang/rust/pull/42033
1437 [42155]: https://github.com/rust-lang/rust/pull/42155
1438 [42271]: https://github.com/rust-lang/rust/pull/42271
1439 [42397]: https://github.com/rust-lang/rust/pull/42397
1440 [42417]: https://github.com/rust-lang/rust/pull/42417
1441 [42430]: https://github.com/rust-lang/rust/pull/42430
1442 [42431]: https://github.com/rust-lang/rust/pull/42431
1443 [42533]: https://github.com/rust-lang/rust/pull/42533
1444 [42571]: https://github.com/rust-lang/rust/pull/42571
1445 [42613]: https://github.com/rust-lang/rust/pull/42613
1446 [42799]: https://github.com/rust-lang/rust/pull/42799
1447 [42807]: https://github.com/rust-lang/rust/pull/42807
1448 [42809]: https://github.com/rust-lang/rust/pull/42809
1449 [42822]: https://github.com/rust-lang/rust/pull/42822
1450 [42826]: https://github.com/rust-lang/rust/pull/42826
1451 [42854]: https://github.com/rust-lang/rust/pull/42854
1452 [42913]: https://github.com/rust-lang/rust/pull/42913
1453 [42999]: https://github.com/rust-lang/rust/pull/42999
1454 [43011]: https://github.com/rust-lang/rust/pull/43011
1455 [43015]: https://github.com/rust-lang/rust/pull/43015
1456 [43072]: https://github.com/rust-lang/rust/pull/43072
1457 [43077]: https://github.com/rust-lang/rust/pull/43077
1458 [43097]: https://github.com/rust-lang/rust/pull/43097
1459 [43099]: https://github.com/rust-lang/rust/pull/43099
1460 [43170]: https://github.com/rust-lang/rust/pull/43170
1461 [43178]: https://github.com/rust-lang/rust/pull/43178
1462 [43185]: https://github.com/rust-lang/rust/pull/43185
1463 [43228]: https://github.com/rust-lang/rust/pull/43228
1464 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1465 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1466 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1467 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1468 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1469 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1470 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1471 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1472 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1473 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1474 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1475 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1476 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1477 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1478 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1479 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1480 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1481 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1482 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1483 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1484 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1485 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1486 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1487 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1488 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1489 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1490 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1491 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1492 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1493 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1494 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1495 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1496 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1497 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1498 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1499 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1500 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1501 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1502 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1505 Version 1.19.0 (2017-07-20)
1506 ===========================
1511 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1512 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1513 - [Macro recursion limit increased to 1024 from 64.][41676]
1514 - [Added lint for detecting unused macros.][41907]
1515 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1516 For example: `let x = loop { break 7; };`
1517 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1518 contain `Copy` types and cannot have a `Drop` implementation.
1519 Example: `union Foo { bar: u8, baz: usize }`
1520 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1521 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1526 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1527 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1528 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1529 you should use `--target armv7-linux-androideabi`.
1530 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1531 - [Minor optimisation of string operations.][42037]
1532 - [Compiler error message is now `aborting due to previous error(s)` instead of
1533 `aborting due to N previous errors`][42150] This was previously inaccurate and
1534 would only count certain kinds of errors.
1535 - [The compiler now supports Visual Studio 2017][42225]
1536 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1537 - [Added a lot][42264] of [new error codes][42302]
1538 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1539 libraries with C Run-time Libraries(CRT) to be statically linked.
1540 - [Fixed various ARM codegen bugs][42740]
1545 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1546 `Extend<Cow<'a, str>>`][41449]
1547 - [`Vec` now implements `From<&mut [T]>`][41530]
1548 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1549 - [`SplitWhitespace` now implements `Clone`][41659]
1550 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1552 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1553 macros, but for printing to stderr.
1558 - [`OsString::shrink_to_fit`]
1561 - [`thread::ThreadId`]
1566 - [Build scripts can now add environment variables to the environment
1567 the crate is being compiled in.
1568 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1569 - [Subcommands now replace the current process rather than spawning a new
1570 child process][cargo/3970]
1571 - [Workspace members can now accept glob file patterns][cargo/3979]
1572 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1573 the members in a given workspace.][cargo/3988]
1574 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1575 - [Target directory path is now in the cargo metadata][cargo/4022]
1576 - [Cargo no longer checks out a local working directory for the
1577 crates.io index][cargo/4026] This should provide smaller file size for the
1578 registry, and improve cloning times, especially on Windows machines.
1579 - [Added an `--exclude` option for excluding certain packages when using the
1580 `--all` option][cargo/4031]
1581 - [Cargo will now automatically retry when receiving a 5xx error
1582 from crates.io][cargo/4032]
1583 - [The `--features` option now accepts multiple comma or space
1584 delimited values.][cargo/4084]
1585 - [Added support for custom target specific runners][cargo/3954]
1590 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1592 - [Rust will now release XZ compressed packages][rust-installer/57]
1593 - [rustup will now prefer to download rust packages with
1594 XZ compression][rustup/1100] over GZip packages.
1595 - [Added the ability to escape `#` in rust documentation][41785] By adding
1596 additional `#`'s ie. `##` is now `#`
1601 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1602 - [`-Z` flags are now no longer allowed to be used on the stable
1603 compiler.][41751] This has been a warning for a year previous to this.
1604 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1605 longer works][42844]. Users should migrate to the built-in `check`
1606 command, which has been available since 1.16.
1607 - [Ending a float literal with `._` is now a hard error.
1608 Example: `42._` .][41946]
1609 - [Any use of a private `extern crate` outside of its module is now a
1610 hard error.][36886] This was previously a warning.
1611 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1612 relative while the `::` prefix makes a path absolute, but was ignored and the
1613 path was relative regardless.
1614 - [Floating point constants in match patterns is now a hard error][36890]
1615 This was previously a warning.
1616 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1617 match patterns is now a hard error][36891] This was previously a warning.
1618 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1620 - [From the pound escape, lines consisting of multiple `#`s are
1622 - [It is an error to re-export private enum variants][42460]. This is
1623 known to break a number of crates that depend on an older version of
1625 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1626 to use it to find the linker, and the build will fail where it did
1627 not previously][42607]
1629 [36886]: https://github.com/rust-lang/rust/issues/36886
1630 [36888]: https://github.com/rust-lang/rust/issues/36888
1631 [36890]: https://github.com/rust-lang/rust/issues/36890
1632 [36891]: https://github.com/rust-lang/rust/issues/36891
1633 [36892]: https://github.com/rust-lang/rust/issues/36892
1634 [37406]: https://github.com/rust-lang/rust/issues/37406
1635 [39983]: https://github.com/rust-lang/rust/pull/39983
1636 [41145]: https://github.com/rust-lang/rust/pull/41145
1637 [41192]: https://github.com/rust-lang/rust/pull/41192
1638 [41258]: https://github.com/rust-lang/rust/pull/41258
1639 [41370]: https://github.com/rust-lang/rust/pull/41370
1640 [41449]: https://github.com/rust-lang/rust/pull/41449
1641 [41530]: https://github.com/rust-lang/rust/pull/41530
1642 [41624]: https://github.com/rust-lang/rust/pull/41624
1643 [41656]: https://github.com/rust-lang/rust/pull/41656
1644 [41659]: https://github.com/rust-lang/rust/pull/41659
1645 [41676]: https://github.com/rust-lang/rust/pull/41676
1646 [41751]: https://github.com/rust-lang/rust/pull/41751
1647 [41764]: https://github.com/rust-lang/rust/pull/41764
1648 [41785]: https://github.com/rust-lang/rust/pull/41785
1649 [41873]: https://github.com/rust-lang/rust/pull/41873
1650 [41907]: https://github.com/rust-lang/rust/pull/41907
1651 [41946]: https://github.com/rust-lang/rust/pull/41946
1652 [42016]: https://github.com/rust-lang/rust/pull/42016
1653 [42037]: https://github.com/rust-lang/rust/pull/42037
1654 [42068]: https://github.com/rust-lang/rust/pull/42068
1655 [42150]: https://github.com/rust-lang/rust/pull/42150
1656 [42162]: https://github.com/rust-lang/rust/pull/42162
1657 [42225]: https://github.com/rust-lang/rust/pull/42225
1658 [42264]: https://github.com/rust-lang/rust/pull/42264
1659 [42302]: https://github.com/rust-lang/rust/pull/42302
1660 [42460]: https://github.com/rust-lang/rust/issues/42460
1661 [42607]: https://github.com/rust-lang/rust/issues/42607
1662 [42740]: https://github.com/rust-lang/rust/pull/42740
1663 [42844]: https://github.com/rust-lang/rust/issues/42844
1664 [42948]: https://github.com/rust-lang/rust/pull/42948
1665 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1666 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1667 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1668 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1669 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1670 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1671 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1672 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1673 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1674 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1675 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1676 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1677 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1678 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1679 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1680 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1681 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1682 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1683 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1684 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1685 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1686 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1689 Version 1.18.0 (2017-06-08)
1690 ===========================
1695 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1696 make the item visible to just that module tree. Also accepts the keyword
1697 `crate` to make something public to the whole crate but not users of the
1698 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1699 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1700 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1701 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1702 types like `Write + Send`, trailing `+` are now supported in trait objects,
1703 and better error reporting for trait objects starting with `?Sized`.
1704 - [0e+10 is now a valid floating point literal][40589]
1705 - [Now warns if you bind a lifetime parameter to 'static][40734]
1706 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1707 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1708 representation in some cases.][40377]
1713 - [rustc can now emit mir with `--emit mir`][39891]
1714 - [Improved LLVM IR for trivial functions][40367]
1715 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1716 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1717 opportunities found through profiling
1718 - [Improved backtrace formatting when panicking][38165]
1723 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1724 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1725 iteration or reallocation.
1726 - [Simplified HashMap Bucket interface][40561] provides performance
1727 improvements for iterating and cloning.
1728 - [Specialize Vec::from_elem to use calloc][40409]
1729 - [Fixed Race condition in fs::create_dir_all][39799]
1730 - [No longer caching stdio on Windows][40516]
1731 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1732 2.50%~ faster and in one case now 12.50% faster.
1733 - [Optimized `AtomicBool::fetch_nand`][41143]
1738 - [`Child::try_wait`]
1739 - [`HashMap::retain`]
1740 - [`HashSet::retain`]
1742 - [`TcpStream::peek`]
1743 - [`UdpSocket::peek`]
1744 - [`UdpSocket::peek_from`]
1749 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1750 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1751 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1752 - [Added Android build support][cargo/3885]
1753 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1754 of a certain type, for example `cargo build --bins` will build all
1756 - [Added support for haiku][cargo/3952]
1761 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1762 - [Added rust-windbg script for better debugging on Windows][39983]
1763 - [Rust now uses the official cross compiler for NetBSD][40612]
1764 - [rustdoc now accepts `#` at the start of files][40828]
1765 - [Fixed jemalloc support for musl][41168]
1770 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1771 always placed after the sign if it exists and before the digits. With the `#`
1772 flag the zeroes are placed after the prefix and before the digits.
1773 - [Due to the struct field optimisation][40377], using `transmute` on structs
1774 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1775 always been undefined behavior, but is now more likely to break in practice.
1776 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1777 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1778 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1779 - [Overlapping inherent `impl`s are now a hard error][40728]
1780 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1781 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1782 `out.asm` and `out.ll` instead of only one of the filetypes.
1783 - [ calling a function that returns `Self` will no longer work][41805] when
1784 the size of `Self` cannot be statically determined.
1785 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1786 this has caused a few regressions namely:
1788 - Changed the link order of local static/dynamic libraries (respecting the
1789 order on given rather than having the compiler reorder).
1790 - Changed how MinGW is linked, native code linked to dynamic libraries
1791 may require manually linking to the gcc support library (for the native
1794 [38165]: https://github.com/rust-lang/rust/pull/38165
1795 [39799]: https://github.com/rust-lang/rust/pull/39799
1796 [39891]: https://github.com/rust-lang/rust/pull/39891
1797 [39983]: https://github.com/rust-lang/rust/pull/39983
1798 [40043]: https://github.com/rust-lang/rust/pull/40043
1799 [40241]: https://github.com/rust-lang/rust/pull/40241
1800 [40338]: https://github.com/rust-lang/rust/pull/40338
1801 [40367]: https://github.com/rust-lang/rust/pull/40367
1802 [40377]: https://github.com/rust-lang/rust/pull/40377
1803 [40409]: https://github.com/rust-lang/rust/pull/40409
1804 [40516]: https://github.com/rust-lang/rust/pull/40516
1805 [40556]: https://github.com/rust-lang/rust/pull/40556
1806 [40561]: https://github.com/rust-lang/rust/pull/40561
1807 [40589]: https://github.com/rust-lang/rust/pull/40589
1808 [40612]: https://github.com/rust-lang/rust/pull/40612
1809 [40723]: https://github.com/rust-lang/rust/pull/40723
1810 [40728]: https://github.com/rust-lang/rust/pull/40728
1811 [40731]: https://github.com/rust-lang/rust/pull/40731
1812 [40734]: https://github.com/rust-lang/rust/pull/40734
1813 [40805]: https://github.com/rust-lang/rust/pull/40805
1814 [40807]: https://github.com/rust-lang/rust/pull/40807
1815 [40828]: https://github.com/rust-lang/rust/pull/40828
1816 [40870]: https://github.com/rust-lang/rust/pull/40870
1817 [41085]: https://github.com/rust-lang/rust/pull/41085
1818 [41143]: https://github.com/rust-lang/rust/pull/41143
1819 [41168]: https://github.com/rust-lang/rust/pull/41168
1820 [41270]: https://github.com/rust-lang/rust/issues/41270
1821 [41469]: https://github.com/rust-lang/rust/pull/41469
1822 [41805]: https://github.com/rust-lang/rust/issues/41805
1823 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1824 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1825 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1826 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1827 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1828 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1829 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1830 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1831 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1832 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1833 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1834 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1835 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1836 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1839 Version 1.17.0 (2017-04-27)
1840 ===========================
1845 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1846 * [Fields of structs may be initialized without duplicating the field/variable
1847 names][39761]. [RFC 1682]
1848 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1849 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1850 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1851 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1852 `'b`. Soundness fix.
1853 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1854 * [Static variables may contain references to other statics][40027]
1859 * [Exit quickly on only `--emit dep-info`][40336]
1860 * [Make `-C relocation-model` more correctly determine whether the linker
1861 creates a position-independent executable][40245]
1862 * [Add `-C overflow-checks` to directly control whether integer overflow
1864 * [The rustc type checker now checks items on demand instead of in a single
1865 in-order pass][40008]. This is mostly an internal refactoring in support of
1866 future work, including incremental type checking, but also resolves [RFC
1867 1647], allowing `Self` to appear in `impl` `where` clauses.
1868 * [Optimize vtable loads][39995]
1869 * [Turn off vectorization for Emscripten targets][39990]
1870 * [Provide suggestions for unknown macros imported with `use`][39953]
1871 * [Fix ICEs in path resolution][39939]
1872 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1873 * [Add clearer error message using `&str + &str`][39116]
1884 * [`Ordering::then`]
1885 * [`Ordering::then_with`]
1886 * [`BTreeMap::range`]
1887 * [`BTreeMap::range_mut`]
1888 * [`collections::Bound`]
1889 * [`process::abort`]
1890 * [`ptr::read_unaligned`]
1891 * [`ptr::write_unaligned`]
1892 * [`Result::expect_err`]
1895 * [`Cell::into_inner`]
1901 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1902 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1903 * [`String` implements `FromIterator<&char>`][40028]
1904 * `Box` [implements][40009] a number of new conversions:
1905 `From<Box<str>> for String`,
1906 `From<Box<[T]>> for Vec<T>`,
1907 `From<Box<CStr>> for CString`,
1908 `From<Box<OsStr>> for OsString`,
1909 `From<Box<Path>> for PathBuf`,
1910 `Into<Box<str>> for String`,
1911 `Into<Box<[T]>> for Vec<T>`,
1912 `Into<Box<CStr>> for CString`,
1913 `Into<Box<OsStr>> for OsString`,
1914 `Into<Box<Path>> for PathBuf`,
1915 `Default for Box<str>`,
1916 `Default for Box<CStr>`,
1917 `Default for Box<OsStr>`,
1918 `From<&CStr> for Box<CStr>`,
1919 `From<&OsStr> for Box<OsStr>`,
1920 `From<&Path> for Box<Path>`
1921 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1922 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1923 * [Slightly optimize `slice::sort`][39538]
1924 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1925 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1926 `Box<str>` implements `From<&str>`][39438]
1927 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1928 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1929 * [`format!` estimates the needed capacity before writing a string][39356]
1930 * [Support unprivileged symlink creation in Windows][38921]
1931 * [`PathBuf` implements `Default`][38764]
1932 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1933 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1934 and poor hash functions.
1939 * [Add `cargo check --all`][cargo/3731]
1940 * [Add an option to ignore SSL revocation checking][cargo/3699]
1941 * [Add `cargo run --package`][cargo/3691]
1942 * [Add `required_features`][cargo/3667]
1943 * [Assume `build.rs` is a build script][cargo/3664]
1944 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1949 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1951 * [The "Unstable Book" documents nightly-only features][ubook]
1952 * [Improve the style of the sidebar in rustdoc output][40265]
1953 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1954 * [Fix MSP430 breakage due to `i128`][40257]
1955 * [Preliminary Solaris/SPARCv9 support][39903]
1956 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1957 run without installing the MSVC runtime.
1958 * [`rustdoc --test` includes file names in test names][39788]
1959 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1960 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1961 * [Initial support for `aarch64-unknown-freebsd`][39491]
1962 * [Initial support for `i686-unknown-netbsd`][39426]
1963 * [This release no longer includes the old makefile build system][39431]. Rust
1964 is built with a custom build system, written in Rust, and with Cargo.
1965 * [Add Debug implementations for libcollection structs][39002]
1966 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1967 * [`--test-threads=0` produces an error][38945]
1968 * [`rustup` installs documentation by default][40526]
1969 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1970 WinDbg and Visual Studio to improve the debugging experience.
1975 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1976 workaround, either use MSVC 2015 or run vcvars.bat.
1977 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1978 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1979 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1981 * [`format!` and `Display::to_string` panic if an underlying formatting
1982 implementation returns an error][40117]. Previously the error was silently
1983 ignored. It is incorrect for `write_fmt` to return an error when writing
1985 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1986 crates were marked stable and could be accessed from the stable toolchain.
1987 * [Rust git source no longer includes vendored crates][39728]. Those that need
1988 to build with vendored crates should build from release tarballs.
1989 * [Fix inert attributes from `proc_macro_derives`][39572]
1990 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1991 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1993 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1994 existing code generally ignores the type of dead-code unless a type-hint is
1995 provided; this can cause surprising inference interactions particularly around
1996 defaulting. The new code uniformly ignores the result type of dead-code.
1997 * [Tuple-struct constructors with private fields are no longer visible][38932]
1998 * [Lifetime parameters that do not appear in the arguments are now considered
1999 early-bound][38897], resolving a soundness bug (#[32330]). The
2000 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2002 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2003 * [Make transmuting from fn item types to pointer-sized types a hard
2006 [27787]: https://github.com/rust-lang/rust/issues/27787
2007 [32330]: https://github.com/rust-lang/rust/issues/32330
2008 [34198]: https://github.com/rust-lang/rust/pull/34198
2009 [38161]: https://github.com/rust-lang/rust/pull/38161
2010 [38368]: https://github.com/rust-lang/rust/pull/38368
2011 [38584]: https://github.com/rust-lang/rust/issues/38584
2012 [38661]: https://github.com/rust-lang/rust/pull/38661
2013 [38764]: https://github.com/rust-lang/rust/pull/38764
2014 [38864]: https://github.com/rust-lang/rust/issues/38864
2015 [38897]: https://github.com/rust-lang/rust/pull/38897
2016 [38921]: https://github.com/rust-lang/rust/pull/38921
2017 [38932]: https://github.com/rust-lang/rust/pull/38932
2018 [38945]: https://github.com/rust-lang/rust/pull/38945
2019 [38981]: https://github.com/rust-lang/rust/pull/38981
2020 [39002]: https://github.com/rust-lang/rust/pull/39002
2021 [39116]: https://github.com/rust-lang/rust/pull/39116
2022 [39193]: https://github.com/rust-lang/rust/pull/39193
2023 [39265]: https://github.com/rust-lang/rust/pull/39265
2024 [39356]: https://github.com/rust-lang/rust/pull/39356
2025 [39372]: https://github.com/rust-lang/rust/pull/39372
2026 [39426]: https://github.com/rust-lang/rust/pull/39426
2027 [39431]: https://github.com/rust-lang/rust/pull/39431
2028 [39438]: https://github.com/rust-lang/rust/pull/39438
2029 [39440]: https://github.com/rust-lang/rust/pull/39440
2030 [39485]: https://github.com/rust-lang/rust/pull/39485
2031 [39491]: https://github.com/rust-lang/rust/pull/39491
2032 [39518]: https://github.com/rust-lang/rust/pull/39518
2033 [39538]: https://github.com/rust-lang/rust/pull/39538
2034 [39572]: https://github.com/rust-lang/rust/pull/39572
2035 [39633]: https://github.com/rust-lang/rust/pull/39633
2036 [39642]: https://github.com/rust-lang/rust/pull/39642
2037 [39728]: https://github.com/rust-lang/rust/pull/39728
2038 [39761]: https://github.com/rust-lang/rust/pull/39761
2039 [39788]: https://github.com/rust-lang/rust/pull/39788
2040 [39793]: https://github.com/rust-lang/rust/pull/39793
2041 [39837]: https://github.com/rust-lang/rust/pull/39837
2042 [39843]: https://github.com/rust-lang/rust/pull/39843
2043 [39851]: https://github.com/rust-lang/rust/pull/39851
2044 [39903]: https://github.com/rust-lang/rust/pull/39903
2045 [39939]: https://github.com/rust-lang/rust/pull/39939
2046 [39953]: https://github.com/rust-lang/rust/pull/39953
2047 [39960]: https://github.com/rust-lang/rust/pull/39960
2048 [39990]: https://github.com/rust-lang/rust/pull/39990
2049 [39995]: https://github.com/rust-lang/rust/pull/39995
2050 [40008]: https://github.com/rust-lang/rust/pull/40008
2051 [40009]: https://github.com/rust-lang/rust/pull/40009
2052 [40027]: https://github.com/rust-lang/rust/pull/40027
2053 [40028]: https://github.com/rust-lang/rust/pull/40028
2054 [40037]: https://github.com/rust-lang/rust/pull/40037
2055 [40117]: https://github.com/rust-lang/rust/pull/40117
2056 [40166]: https://github.com/rust-lang/rust/pull/40166
2057 [40245]: https://github.com/rust-lang/rust/pull/40245
2058 [40257]: https://github.com/rust-lang/rust/pull/40257
2059 [40261]: https://github.com/rust-lang/rust/pull/40261
2060 [40265]: https://github.com/rust-lang/rust/pull/40265
2061 [40319]: https://github.com/rust-lang/rust/pull/40319
2062 [40336]: https://github.com/rust-lang/rust/pull/40336
2063 [40526]: https://github.com/rust-lang/rust/pull/40526
2064 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2065 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2066 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2067 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2068 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2069 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2070 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2071 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2072 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2073 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2074 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2075 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2076 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2077 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2078 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2079 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2080 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2081 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2082 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2083 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2084 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2085 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2086 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2087 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2088 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2089 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2090 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2091 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2092 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2093 [mdbook]: https://crates.io/crates/mdbook
2094 [ubook]: https://doc.rust-lang.org/unstable-book/
2097 Version 1.16.0 (2017-03-16)
2098 ===========================
2103 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2104 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2105 match patterns][38069]
2106 * [Clean up semantics of `self` in an import list][38313]
2107 * [`Self` may appear in `impl` headers][38920]
2108 * [`Self` may appear in struct expressions][39282]
2113 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2114 a `.rmeta` file containing only crate metadata][38571]. This can be
2115 used by tools like the Rust Language Service to perform
2116 metadata-only builds.
2117 * [Levenshtein based typo suggestions now work in most places, while
2118 previously they worked only for fields and sometimes for local
2119 variables][38927]. Together with the overhaul of "no
2120 resolution"/"unexpected resolution" errors (#[38154]) they result in
2121 large and systematic improvement in resolution diagnostics.
2122 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2124 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2125 * [`rustc` no longer attempts to provide "consider using an explicit
2126 lifetime" suggestions][37057]. They were inaccurate.
2131 * [`VecDeque::truncate`]
2132 * [`VecDeque::resize`]
2133 * [`String::insert_str`]
2134 * [`Duration::checked_add`]
2135 * [`Duration::checked_sub`]
2136 * [`Duration::checked_div`]
2137 * [`Duration::checked_mul`]
2140 * [`SocketAddr::is_ipv4`]
2141 * [`SocketAddr::is_ipv6`]
2142 * [`IpAddr::is_ipv4`]
2143 * [`IpAddr::is_ipv6`]
2145 * [`Vec::dedup_by_key`]
2146 * [`Result::unwrap_or_default`]
2147 * [`<*const T>::wrapping_offset`]
2148 * [`<*mut T>::wrapping_offset`]
2149 * `CommandExt::creation_flags`
2150 * [`File::set_permissions`]
2151 * [`String::split_off`]
2156 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2157 their argument by `Borrow` parameter][37761]
2158 * [All public types in std implement `Debug`][38006]
2159 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2160 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2161 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2163 * [std: Fix partial writes in `LineWriter`][38062]
2164 * [std: Clamp max read/write sizes on Unix][38062]
2165 * [Use more specific panic message for `&str` slicing errors][38066]
2166 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2167 functionality cannot be achieved in std currently.
2168 * [`writeln!`, like `println!`, now accepts a form with no string
2169 or formatting arguments, to just print a newline][38469]
2170 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2171 * [Reduce the size of static data in `std_unicode::tables`][38781]
2172 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2173 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2175 * [`Duration` implements `Sum`][38712]
2176 * [`String` implements `ToSocketAddrs`][39048]
2181 * [The `cargo check` command does a type check of a project without
2182 building it][cargo/3296]
2183 * [crates.io will display CI badges from Travis and AppVeyor, if
2184 specified in Cargo.toml][cargo/3546]
2185 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2186 * [Compilation profiles accept integer values for `debug`, in addition
2187 to `true` and `false`. These are passed to `rustc` as the value to
2188 `-C debuginfo`][cargo/3534]
2189 * [Implement `cargo --version --verbose`][cargo/3604]
2190 * [All builds now output 'dep-info' build dependencies compatible with
2191 make and ninja][cargo/3557]
2192 * [Build all workspace members with `build --all`][cargo/3511]
2193 * [Document all workspace members with `doc --all`][cargo/3515]
2194 * [Path deps outside workspace are not members][cargo/3443]
2199 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2200 the path to the Rust implementation][38589]
2201 * [The `armv7-linux-androideabi` target no longer enables NEON
2202 extensions, per Google's ABI guide][38413]
2203 * [The stock standard library can be compiled for Redox OS][38401]
2204 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2206 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2208 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2213 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2214 match patterns][38069]
2215 * In this release, references to uninhabited types can not be
2216 pattern-matched. This was accidentally allowed in 1.15.
2217 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2218 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2220 * [Clean up semantics of `self` in an import list][38313]
2221 * Reimplemented lifetime elision. This change was almost entirely compatible
2222 with existing code, but it did close a number of small bugs and loopholes,
2223 as well as being more accepting in some other [cases][41105].
2225 [37057]: https://github.com/rust-lang/rust/pull/37057
2226 [37761]: https://github.com/rust-lang/rust/pull/37761
2227 [38006]: https://github.com/rust-lang/rust/pull/38006
2228 [38051]: https://github.com/rust-lang/rust/pull/38051
2229 [38062]: https://github.com/rust-lang/rust/pull/38062
2230 [38062]: https://github.com/rust-lang/rust/pull/38622
2231 [38066]: https://github.com/rust-lang/rust/pull/38066
2232 [38069]: https://github.com/rust-lang/rust/pull/38069
2233 [38131]: https://github.com/rust-lang/rust/pull/38131
2234 [38154]: https://github.com/rust-lang/rust/pull/38154
2235 [38274]: https://github.com/rust-lang/rust/pull/38274
2236 [38304]: https://github.com/rust-lang/rust/pull/38304
2237 [38313]: https://github.com/rust-lang/rust/pull/38313
2238 [38314]: https://github.com/rust-lang/rust/pull/38314
2239 [38327]: https://github.com/rust-lang/rust/pull/38327
2240 [38401]: https://github.com/rust-lang/rust/pull/38401
2241 [38413]: https://github.com/rust-lang/rust/pull/38413
2242 [38469]: https://github.com/rust-lang/rust/pull/38469
2243 [38559]: https://github.com/rust-lang/rust/pull/38559
2244 [38571]: https://github.com/rust-lang/rust/pull/38571
2245 [38580]: https://github.com/rust-lang/rust/pull/38580
2246 [38589]: https://github.com/rust-lang/rust/pull/38589
2247 [38670]: https://github.com/rust-lang/rust/pull/38670
2248 [38712]: https://github.com/rust-lang/rust/pull/38712
2249 [38726]: https://github.com/rust-lang/rust/pull/38726
2250 [38781]: https://github.com/rust-lang/rust/pull/38781
2251 [38798]: https://github.com/rust-lang/rust/pull/38798
2252 [38909]: https://github.com/rust-lang/rust/pull/38909
2253 [38920]: https://github.com/rust-lang/rust/pull/38920
2254 [38927]: https://github.com/rust-lang/rust/pull/38927
2255 [39048]: https://github.com/rust-lang/rust/pull/39048
2256 [39282]: https://github.com/rust-lang/rust/pull/39282
2257 [39379]: https://github.com/rust-lang/rust/pull/39379
2258 [41105]: https://github.com/rust-lang/rust/issues/41105
2259 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2260 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2261 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2262 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2263 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2264 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2265 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2266 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2267 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2268 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2269 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2270 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2271 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2272 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2273 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2274 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2275 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2276 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2277 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2278 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2279 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2280 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2281 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2282 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2283 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2284 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2285 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2286 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2287 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2288 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2291 Version 1.15.1 (2017-02-09)
2292 ===========================
2294 * [Fix IntoIter::as_mut_slice's signature][39466]
2295 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2297 [39466]: https://github.com/rust-lang/rust/pull/39466
2298 [39523]: https://github.com/rust-lang/rust/pull/39523
2301 Version 1.15.0 (2017-02-02)
2302 ===========================
2307 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2308 stable. This allows popular code-generating crates like Serde and Diesel to
2309 work ergonomically. [RFC 1681].
2310 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2311 with curly braces][36868]. Part of [RFC 1506].
2312 * [A number of minor changes to name resolution have been activated][37127].
2313 They add up to more consistent semantics, allowing for future evolution of
2314 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2315 details of what is different. The breaking changes here have been transitioned
2316 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2317 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2319 * [`?Sized` can be used in `where` clauses][37791]
2320 * [There is now a limit on the size of monomorphized types and it can be
2321 modified with the `#![type_size_limit]` crate attribute, similarly to
2322 the `#![recursion_limit]` attribute][37789]
2327 * [On Windows, the compiler will apply dllimport attributes when linking to
2328 extern functions][37973]. Additional attributes and flags can control which
2329 library kind is linked and its name. [RFC 1717].
2330 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2331 * [The `--test` flag works with procedural macro crates][38107]
2332 * [Fix `extern "aapcs" fn` ABI][37814]
2333 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2334 * [The `format!` expander recognizes incorrect `printf` and shell-style
2335 formatting directives and suggests the correct format][37613].
2336 * [Only report one error for all unused imports in an import list][37456]
2338 Compiler Performance
2339 --------------------
2341 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2342 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2343 * [Don't clone in `UnificationTable::probe`][37848]
2344 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2345 * [Use small vectors in type walker][37760]
2346 * [Macro expansion performance was improved][37701]
2347 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2348 * [Replace FNV with a faster hash function][37229]
2353 * [`std::iter::Iterator::min_by`]
2354 * [`std::iter::Iterator::max_by`]
2355 * [`std::os::*::fs::FileExt`]
2356 * [`std::sync::atomic::Atomic*::get_mut`]
2357 * [`std::sync::atomic::Atomic*::into_inner`]
2358 * [`std::vec::IntoIter::as_slice`]
2359 * [`std::vec::IntoIter::as_mut_slice`]
2360 * [`std::sync::mpsc::Receiver::try_iter`]
2361 * [`std::os::unix::process::CommandExt::before_exec`]
2362 * [`std::rc::Rc::strong_count`]
2363 * [`std::rc::Rc::weak_count`]
2364 * [`std::sync::Arc::strong_count`]
2365 * [`std::sync::Arc::weak_count`]
2366 * [`std::char::encode_utf8`]
2367 * [`std::char::encode_utf16`]
2368 * [`std::cell::Ref::clone`]
2369 * [`std::io::Take::into_inner`]
2374 * [The standard sorting algorithm has been rewritten for dramatic performance
2375 improvements][38192]. It is a hybrid merge sort, drawing influences from
2376 Timsort. Previously it was a naive merge sort.
2377 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2378 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2380 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2381 and `char_indices().last()`][37882]
2382 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2383 * [Chinese characters display correctly in `fmt::Debug`][37855]
2384 * [Derive `Default` for `Duration`][37699]
2385 * [Support creation of anonymous pipes on WinXP/2k][37677]
2386 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2387 * [Don't pass overlapped handles to processes][38835]
2392 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2393 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2394 should instead check the variable at runtime with `std::env`. That the value
2395 was set at build time was a bug, and incorrect when cross-compiling. This
2396 change is known to cause breakage.
2397 * [Add `--all` flag to `cargo test`][cargo/3221]
2398 * [Compile statically against the MSVC CRT][cargo/3363]
2399 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2400 * [Link OpenSSL statically on OSX][cargo/3311]
2401 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2402 * [Test for bad path overrides with summaries][cargo/3336]
2403 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2404 * [Fix retrying crate downloads for network errors][cargo/3348]
2405 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2406 * [Emit more info on --message-format=json][cargo/3319]
2407 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2408 * [Don't ignore errors in workspace manifest][cargo/3409]
2409 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2414 * [Test runners (binaries built with `--test`) now support a `--list` argument
2415 that lists the tests it contains][38185]
2416 * [Test runners now support a `--exact` argument that makes the test filter
2417 match exactly, instead of matching only a substring of the test name][38181]
2418 * [rustdoc supports a `--playground-url` flag][37763]
2419 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2424 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2425 continue to be used in this release by passing `--disable-rustbuild` to the
2426 configure script, but they will be deleted soon. Note that the new build
2427 system uses a different on-disk layout that will likely affect any scripts
2429 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2431 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2432 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2438 * [A number of minor changes to name resolution have been activated][37127].
2439 They add up to more consistent semantics, allowing for future evolution of
2440 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2441 details of what is different. The breaking changes here have been transitioned
2442 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2443 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2444 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2445 should instead check the variable at runtime with `std::env`. That the value
2446 was set at build time was a bug, and incorrect when cross-compiling. This
2447 change is known to cause breakage.
2448 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2449 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2450 1.10 and is now an error by default. It will become a hard error in the near
2452 * [The semantics relating modules to file system directories are changing in
2453 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2454 lint, which is a warning in this release, and will become a hard error in the
2456 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2457 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2458 the underlying iterator][37834]
2460 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2461 [33685]: https://github.com/rust-lang/rust/issues/33685
2462 [36868]: https://github.com/rust-lang/rust/pull/36868
2463 [37127]: https://github.com/rust-lang/rust/pull/37127
2464 [37229]: https://github.com/rust-lang/rust/pull/37229
2465 [37456]: https://github.com/rust-lang/rust/pull/37456
2466 [37527]: https://github.com/rust-lang/rust/pull/37527
2467 [37602]: https://github.com/rust-lang/rust/pull/37602
2468 [37613]: https://github.com/rust-lang/rust/pull/37613
2469 [37615]: https://github.com/rust-lang/rust/pull/37615
2470 [37636]: https://github.com/rust-lang/rust/pull/37636
2471 [37627]: https://github.com/rust-lang/rust/pull/37627
2472 [37642]: https://github.com/rust-lang/rust/pull/37642
2473 [37677]: https://github.com/rust-lang/rust/pull/37677
2474 [37699]: https://github.com/rust-lang/rust/pull/37699
2475 [37701]: https://github.com/rust-lang/rust/pull/37701
2476 [37705]: https://github.com/rust-lang/rust/pull/37705
2477 [37749]: https://github.com/rust-lang/rust/pull/37749
2478 [37760]: https://github.com/rust-lang/rust/pull/37760
2479 [37763]: https://github.com/rust-lang/rust/pull/37763
2480 [37764]: https://github.com/rust-lang/rust/pull/37764
2481 [37789]: https://github.com/rust-lang/rust/pull/37789
2482 [37791]: https://github.com/rust-lang/rust/pull/37791
2483 [37814]: https://github.com/rust-lang/rust/pull/37814
2484 [37817]: https://github.com/rust-lang/rust/pull/37817
2485 [37834]: https://github.com/rust-lang/rust/pull/37834
2486 [37848]: https://github.com/rust-lang/rust/pull/37848
2487 [37855]: https://github.com/rust-lang/rust/pull/37855
2488 [37882]: https://github.com/rust-lang/rust/pull/37882
2489 [37888]: https://github.com/rust-lang/rust/pull/37888
2490 [37973]: https://github.com/rust-lang/rust/pull/37973
2491 [37979]: https://github.com/rust-lang/rust/pull/37979
2492 [38086]: https://github.com/rust-lang/rust/pull/38086
2493 [38107]: https://github.com/rust-lang/rust/pull/38107
2494 [38117]: https://github.com/rust-lang/rust/pull/38117
2495 [38134]: https://github.com/rust-lang/rust/pull/38134
2496 [38146]: https://github.com/rust-lang/rust/pull/38146
2497 [38181]: https://github.com/rust-lang/rust/pull/38181
2498 [38182]: https://github.com/rust-lang/rust/pull/38182
2499 [38185]: https://github.com/rust-lang/rust/pull/38185
2500 [38192]: https://github.com/rust-lang/rust/pull/38192
2501 [38279]: https://github.com/rust-lang/rust/pull/38279
2502 [38835]: https://github.com/rust-lang/rust/pull/38835
2503 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2504 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2505 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2506 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2507 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2508 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2509 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2510 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2511 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2512 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2513 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2514 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2515 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2516 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2517 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2518 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2519 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2520 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2521 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2522 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2523 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2524 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2525 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2526 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2527 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2528 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2529 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2530 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2531 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2532 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2533 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2534 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2535 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2536 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2537 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2538 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2539 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2540 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2543 Version 1.14.0 (2016-12-22)
2544 ===========================
2549 * [`..` matches multiple tuple fields in enum variants, structs
2550 and tuples][36843]. [RFC 1492].
2551 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2552 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2553 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2554 dereferencing][36822]
2559 * [Mark enums with non-zero discriminant as non-zero][37224]
2560 * [Lower-case `static mut` names are linted like other
2561 statics and consts][37162]
2562 * [Fix ICE on some macros in const integer positions
2563 (e.g. `[u8; m!()]`)][36819]
2564 * [Improve error message and snippet for "did you mean `x`"][36798]
2565 * [Add a panic-strategy field to the target specification][36794]
2566 * [Include LLVM version in `--version --verbose`][37200]
2568 Compile-time Optimizations
2569 --------------------------
2571 * [Improve macro expansion performance][37569]
2572 * [Shrink `Expr_::ExprInlineAsm`][37445]
2573 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2574 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2575 * [Avoid more allocations when compiling html5ever][37373]
2576 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2577 * [Avoid some allocations in the macro parser][37318]
2578 * [Use a faster deflate setting][37298]
2579 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2580 during interning of slices][37270]
2581 * [Optimize `write_metadata`][37267]
2582 * [Don't process obligation forest cycles when stalled][37231]
2583 * [Avoid many `CrateConfig` clones][37161]
2584 * [Optimize `Substs::super_fold_with`][37108]
2585 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2586 * [Speed up `plug_leaks`][36917]
2591 * [`println!()`, with no arguments, prints newline][36825].
2592 Previously, an empty string was required to achieve the same.
2593 * [`Wrapping` impls standard binary and unary operators, as well as
2594 the `Sum` and `Product` iterators][37356]
2595 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2597 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2598 `VecDeque` iterators][37315]
2599 * [Improve `SipHasher` performance on small values][37312]
2600 * [Add Iterator trait TrustedLen to enable better FromIterator /
2602 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2603 * [`ReadDir` implements `Debug`][37221]
2604 * [Implement `RefUnwindSafe` for atomic types][37178]
2605 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2606 * [Avoid allocations in `Decoder::read_str`][37064]
2607 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2608 * [Impl `Debug` for raw pointers to unsized data][36880]
2609 * [Don't reuse `HashMap` random seeds][37470]
2610 * [The internal memory layout of `HashMap` is more cache-friendly, for
2611 significant improvements in some operations][36692]
2612 * [`HashMap` uses less memory on 32-bit architectures][36595]
2613 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2618 * [Expose rustc cfg values to build scripts][cargo/3243]
2619 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2620 * [Fix passing --features when testing multiple packages][cargo/3280]
2621 * [Use a single profile set per workspace][cargo/3249]
2622 * [Load `replace` sections from lock files][cargo/3220]
2623 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2628 * [rustup is the recommended Rust installation method][1.14rustup]
2629 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2630 S390x. These are [tier 2] platforms and may have major defects. Follow the
2631 instructions on the website to install, or add the targets to an existing
2632 installation with `rustup target add`. The new target triples are:
2633 - `mips-unknown-linux-gnu`
2634 - `mipsel-unknown-linux-gnu`
2635 - `mips64-unknown-linux-gnuabi64`
2636 - `mips64el-unknown-linux-gnuabi64 `
2637 - `powerpc-unknown-linux-gnu`
2638 - `powerpc64-unknown-linux-gnu`
2639 - `powerpc64le-unknown-linux-gnu`
2640 - `s390x-unknown-linux-gnu `
2641 * This release includes target (std) builds for ARM Linux running MUSL
2642 libc. These are [tier 2] platforms and may have major defects. Add the
2643 following triples to an existing rustup installation with `rustup target add`:
2644 - `arm-unknown-linux-musleabi`
2645 - `arm-unknown-linux-musleabihf`
2646 - `armv7-unknown-linux-musleabihf`
2647 * This release includes [experimental support for WebAssembly][1.14wasm], via
2648 the `wasm32-unknown-emscripten` target. This target is known to have major
2649 defects. Please test, report, and fix.
2650 * rustup no longer installs documentation by default. Run `rustup
2651 component add rust-docs` to install.
2652 * [Fix line stepping in debugger][37310]
2653 * [Enable line number debuginfo in releases][37280]
2658 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2659 * [Add support for Fuchsia OS][37313]
2660 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2665 * [A number of forward-compatibility lints used by the compiler
2666 to gradually introduce language changes have been converted
2667 to deny by default][36894]:
2668 - ["use of inaccessible extern crate erroneously allowed"][36886]
2669 - ["type parameter default erroneously allowed in invalid location"][36887]
2670 - ["detects super or self keywords at the beginning of global path"][36888]
2671 - ["two overlapping inherent impls define an item with the same name
2672 were erroneously allowed"][36889]
2673 - ["floating-point constants cannot be used in patterns"][36890]
2674 - ["constants of struct or enum type can only be used in a pattern if
2675 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2676 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2677 * [Prohibit patterns in trait methods without bodies][37378]
2678 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2679 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2680 * [The `$crate` macro variable is accepted in fewer locations][37213]
2681 * [Impls specifying extra region requirements beyond the trait
2682 they implement are rejected][37167]
2683 * [Enums may not be unsized][37111]. Unsized enums are intended to
2684 work but never have. For now they are forbidden.
2685 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2687 [tier 2]: https://forge.rust-lang.org/platform-support.html
2688 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2689 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2690 [36430]: https://github.com/rust-lang/rust/pull/36430
2691 [36595]: https://github.com/rust-lang/rust/pull/36595
2692 [36595]: https://github.com/rust-lang/rust/pull/36595
2693 [36692]: https://github.com/rust-lang/rust/pull/36692
2694 [36767]: https://github.com/rust-lang/rust/pull/36767
2695 [36794]: https://github.com/rust-lang/rust/pull/36794
2696 [36798]: https://github.com/rust-lang/rust/pull/36798
2697 [36819]: https://github.com/rust-lang/rust/pull/36819
2698 [36822]: https://github.com/rust-lang/rust/pull/36822
2699 [36825]: https://github.com/rust-lang/rust/pull/36825
2700 [36843]: https://github.com/rust-lang/rust/pull/36843
2701 [36880]: https://github.com/rust-lang/rust/pull/36880
2702 [36886]: https://github.com/rust-lang/rust/issues/36886
2703 [36887]: https://github.com/rust-lang/rust/issues/36887
2704 [36888]: https://github.com/rust-lang/rust/issues/36888
2705 [36889]: https://github.com/rust-lang/rust/issues/36889
2706 [36890]: https://github.com/rust-lang/rust/issues/36890
2707 [36891]: https://github.com/rust-lang/rust/issues/36891
2708 [36892]: https://github.com/rust-lang/rust/issues/36892
2709 [36894]: https://github.com/rust-lang/rust/pull/36894
2710 [36917]: https://github.com/rust-lang/rust/pull/36917
2711 [36993]: https://github.com/rust-lang/rust/pull/36993
2712 [37037]: https://github.com/rust-lang/rust/pull/37037
2713 [37064]: https://github.com/rust-lang/rust/pull/37064
2714 [37094]: https://github.com/rust-lang/rust/pull/37094
2715 [37108]: https://github.com/rust-lang/rust/pull/37108
2716 [37111]: https://github.com/rust-lang/rust/pull/37111
2717 [37161]: https://github.com/rust-lang/rust/pull/37161
2718 [37162]: https://github.com/rust-lang/rust/pull/37162
2719 [37167]: https://github.com/rust-lang/rust/pull/37167
2720 [37178]: https://github.com/rust-lang/rust/pull/37178
2721 [37200]: https://github.com/rust-lang/rust/pull/37200
2722 [37213]: https://github.com/rust-lang/rust/pull/37213
2723 [37221]: https://github.com/rust-lang/rust/pull/37221
2724 [37224]: https://github.com/rust-lang/rust/pull/37224
2725 [37230]: https://github.com/rust-lang/rust/pull/37230
2726 [37231]: https://github.com/rust-lang/rust/pull/37231
2727 [37247]: https://github.com/rust-lang/rust/pull/37247
2728 [37267]: https://github.com/rust-lang/rust/pull/37267
2729 [37270]: https://github.com/rust-lang/rust/pull/37270
2730 [37273]: https://github.com/rust-lang/rust/pull/37273
2731 [37280]: https://github.com/rust-lang/rust/pull/37280
2732 [37298]: https://github.com/rust-lang/rust/pull/37298
2733 [37306]: https://github.com/rust-lang/rust/pull/37306
2734 [37310]: https://github.com/rust-lang/rust/pull/37310
2735 [37312]: https://github.com/rust-lang/rust/pull/37312
2736 [37313]: https://github.com/rust-lang/rust/pull/37313
2737 [37315]: https://github.com/rust-lang/rust/pull/37315
2738 [37318]: https://github.com/rust-lang/rust/pull/37318
2739 [37322]: https://github.com/rust-lang/rust/pull/37322
2740 [37326]: https://github.com/rust-lang/rust/pull/37326
2741 [37351]: https://github.com/rust-lang/rust/pull/37351
2742 [37356]: https://github.com/rust-lang/rust/pull/37356
2743 [37367]: https://github.com/rust-lang/rust/pull/37367
2744 [37373]: https://github.com/rust-lang/rust/pull/37373
2745 [37378]: https://github.com/rust-lang/rust/pull/37378
2746 [37389]: https://github.com/rust-lang/rust/pull/37389
2747 [37392]: https://github.com/rust-lang/rust/pull/37392
2748 [37427]: https://github.com/rust-lang/rust/pull/37427
2749 [37439]: https://github.com/rust-lang/rust/pull/37439
2750 [37445]: https://github.com/rust-lang/rust/pull/37445
2751 [37470]: https://github.com/rust-lang/rust/pull/37470
2752 [37569]: https://github.com/rust-lang/rust/pull/37569
2753 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2754 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2755 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2756 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2757 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2758 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2759 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2762 Version 1.13.0 (2016-11-10)
2763 ===========================
2768 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2769 errors, like the `try!` macro, described in [RFC 0243].
2770 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2771 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2772 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2773 * [Fix lifetime rules for 'if' conditions][36029]
2774 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2779 * [Add the `-C link-arg` argument][36574]
2780 * [Remove the old AST-based backend from rustc_trans][35764]
2781 * [Don't enable NEON by default on armv7 Linux][35814]
2782 * [Fix debug line number info for macro expansions][35238]
2783 * [Do not emit "class method" debuginfo for types that are not
2784 DICompositeType][36008]
2785 * [Warn about multiple conflicting #[repr] hints][34623]
2786 * [When sizing DST, don't double-count nested struct prefixes][36351]
2787 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2788 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2789 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2790 * [Expand macros without recursing to avoid stack overflows][36214]
2795 * [Replace macro backtraces with labeled local uses][35702]
2796 * [Improve error message for misplaced doc comments][33922]
2797 * [Buffer unix and lock windows to prevent message interleaving][35975]
2798 * [Update lifetime errors to specifically note temporaries][36171]
2799 * [Special case a few colors for Windows][36178]
2800 * [Suggest `use self` when such an import resolves][36289]
2801 * [Be more specific when type parameter shadows primitive type][36338]
2802 * Many minor improvements
2804 Compile-time Optimizations
2805 --------------------------
2807 * [Compute and cache HIR hashes at beginning][35854]
2808 * [Don't hash types in loan paths][36004]
2809 * [Cache projections in trans][35761]
2810 * [Optimize the parser's last token handling][36527]
2811 * [Only instantiate #[inline] functions in codegen units referencing
2812 them][36524]. This leads to big improvements in cases where crates export
2813 define many inline functions without using them directly.
2814 * [Lazily allocate TypedArena's first chunk][36592]
2815 * [Don't allocate during default HashSet creation][36734]
2822 * [`overflowing_abs`]
2823 * [`RefCell::try_borrow`]
2824 * [`RefCell::try_borrow_mut`]
2829 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2830 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2832 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2833 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2834 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2835 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2836 * [Use arc4rand on FreeBSD][35884]
2837 * [memrchr: Correct aligned offset computation][35969]
2838 * [Improve Demangling of Rust Symbols][36059]
2839 * [Use monotonic time in condition variables][35048]
2840 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2841 * [Implement conversion traits for `char`][35755]
2842 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2843 * [Zero first byte of CString on drop][36264]
2844 * [Inherit overflow checks for sum and product][36372]
2845 * [Add missing Eq implementations][36423]
2846 * [Implement `Debug` for `DirEntry`][36631]
2847 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2849 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2850 * [Implement more traits for `std::io::ErrorKind`][35911]
2851 * [Optimize BinaryHeap bounds checking][36072]
2852 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2853 `extend_with_element`][36355]
2854 * [Fix overflow checking in unsigned pow()][34942]
2859 * This release includes security fixes to both curl and OpenSSL.
2860 * [Fix transitive doctests when panic=abort][cargo/3021]
2861 * [Add --all-features flag to cargo][cargo/3038]
2862 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2863 * [Don't parse the home directory more than once][cargo/3078]
2864 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2865 * [Update OpenSSL to 1.0.2j][cargo/3121]
2866 * [Add license and license_file to cargo metadata output][cargo/3110]
2867 * [Make crates-io registry URL optional in config; ignore all changes to
2868 source.crates-io][cargo/3089]
2869 * [Don't download dependencies from other platforms][cargo/3123]
2870 * [Build transitive dev-dependencies when needed][cargo/3125]
2871 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2872 * [Avoid updating registry when adding existing deps][cargo/3144]
2873 * [Warn about path overrides that won't work][cargo/3136]
2874 * [Use workspaces during `cargo install`][cargo/3146]
2875 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2876 * [Add --message-format flag][cargo/3000]
2877 * [Pass target environment for rustdoc][cargo/3205]
2878 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2879 * [Update curl and curl-sys][cargo/3241]
2880 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2885 * [rustdoc: Add the `--sysroot` argument][36586]
2886 * [rustdoc: Fix a couple of issues with the search results][35655]
2887 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2888 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2889 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2894 * [Remove unmaintained style guide][35124]
2895 * [Add s390x support][36369]
2896 * [Initial work at Haiku OS support][36727]
2897 * [Add mips-uclibc targets][35734]
2898 * [Crate-ify compiler-rt into compiler-builtins][35021]
2899 * [Add rustc version info (git hash + date) to dist tarball][36213]
2900 * Many documentation improvements
2905 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2906 * [Deny (by default) transmuting from fn item types to pointer-sized
2907 types][34923]. Continuing the long transition to zero-sized fn items,
2909 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2911 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2912 * [Fix lifetime rules for 'if' conditions][36029].
2913 * [Inherit overflow checks for sum and product][36372].
2914 * [Forbid user-defined macros named "macro_rules"][36730].
2916 [33922]: https://github.com/rust-lang/rust/pull/33922
2917 [34623]: https://github.com/rust-lang/rust/pull/34623
2918 [34923]: https://github.com/rust-lang/rust/pull/34923
2919 [34942]: https://github.com/rust-lang/rust/pull/34942
2920 [34982]: https://github.com/rust-lang/rust/pull/34982
2921 [35021]: https://github.com/rust-lang/rust/pull/35021
2922 [35048]: https://github.com/rust-lang/rust/pull/35048
2923 [35074]: https://github.com/rust-lang/rust/pull/35074
2924 [35124]: https://github.com/rust-lang/rust/pull/35124
2925 [35234]: https://github.com/rust-lang/rust/pull/35234
2926 [35238]: https://github.com/rust-lang/rust/pull/35238
2927 [35354]: https://github.com/rust-lang/rust/pull/35354
2928 [35559]: https://github.com/rust-lang/rust/pull/35559
2929 [35585]: https://github.com/rust-lang/rust/pull/35585
2930 [35627]: https://github.com/rust-lang/rust/pull/35627
2931 [35655]: https://github.com/rust-lang/rust/pull/35655
2932 [35702]: https://github.com/rust-lang/rust/pull/35702
2933 [35707]: https://github.com/rust-lang/rust/pull/35707
2934 [35728]: https://github.com/rust-lang/rust/pull/35728
2935 [35734]: https://github.com/rust-lang/rust/pull/35734
2936 [35755]: https://github.com/rust-lang/rust/pull/35755
2937 [35761]: https://github.com/rust-lang/rust/pull/35761
2938 [35764]: https://github.com/rust-lang/rust/pull/35764
2939 [35814]: https://github.com/rust-lang/rust/pull/35814
2940 [35854]: https://github.com/rust-lang/rust/pull/35854
2941 [35871]: https://github.com/rust-lang/rust/pull/35871
2942 [35884]: https://github.com/rust-lang/rust/pull/35884
2943 [35911]: https://github.com/rust-lang/rust/pull/35911
2944 [35969]: https://github.com/rust-lang/rust/pull/35969
2945 [35975]: https://github.com/rust-lang/rust/pull/35975
2946 [36004]: https://github.com/rust-lang/rust/pull/36004
2947 [36008]: https://github.com/rust-lang/rust/pull/36008
2948 [36014]: https://github.com/rust-lang/rust/pull/36014
2949 [36029]: https://github.com/rust-lang/rust/pull/36029
2950 [36059]: https://github.com/rust-lang/rust/pull/36059
2951 [36072]: https://github.com/rust-lang/rust/pull/36072
2952 [36101]: https://github.com/rust-lang/rust/pull/36101
2953 [36104]: https://github.com/rust-lang/rust/pull/36104
2954 [36171]: https://github.com/rust-lang/rust/pull/36171
2955 [36173]: https://github.com/rust-lang/rust/pull/36173
2956 [36178]: https://github.com/rust-lang/rust/pull/36178
2957 [36213]: https://github.com/rust-lang/rust/pull/36213
2958 [36214]: https://github.com/rust-lang/rust/pull/36214
2959 [36264]: https://github.com/rust-lang/rust/pull/36264
2960 [36266]: https://github.com/rust-lang/rust/pull/36266
2961 [36289]: https://github.com/rust-lang/rust/pull/36289
2962 [36338]: https://github.com/rust-lang/rust/pull/36338
2963 [36351]: https://github.com/rust-lang/rust/pull/36351
2964 [36355]: https://github.com/rust-lang/rust/pull/36355
2965 [36369]: https://github.com/rust-lang/rust/pull/36369
2966 [36372]: https://github.com/rust-lang/rust/pull/36372
2967 [36423]: https://github.com/rust-lang/rust/pull/36423
2968 [36482]: https://github.com/rust-lang/rust/pull/36482
2969 [36505]: https://github.com/rust-lang/rust/pull/36505
2970 [36524]: https://github.com/rust-lang/rust/pull/36524
2971 [36527]: https://github.com/rust-lang/rust/pull/36527
2972 [36551]: https://github.com/rust-lang/rust/pull/36551
2973 [36574]: https://github.com/rust-lang/rust/pull/36574
2974 [36586]: https://github.com/rust-lang/rust/pull/36586
2975 [36592]: https://github.com/rust-lang/rust/pull/36592
2976 [36631]: https://github.com/rust-lang/rust/pull/36631
2977 [36639]: https://github.com/rust-lang/rust/pull/36639
2978 [36721]: https://github.com/rust-lang/rust/pull/36721
2979 [36727]: https://github.com/rust-lang/rust/pull/36727
2980 [36730]: https://github.com/rust-lang/rust/pull/36730
2981 [36734]: https://github.com/rust-lang/rust/pull/36734
2982 [36754]: https://github.com/rust-lang/rust/pull/36754
2983 [36995]: https://github.com/rust-lang/rust/pull/36995
2984 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2985 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2986 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2987 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2988 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2989 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2990 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2991 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2992 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2993 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2994 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2995 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2996 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2997 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2998 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2999 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3000 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3001 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3002 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3003 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3004 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3005 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3006 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3007 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3008 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3009 [rustup]: https://www.rustup.rs
3010 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3011 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3012 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3013 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3014 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3015 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3016 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3019 Version 1.12.1 (2016-10-20)
3020 ===========================
3025 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3026 * [Confusion with double negation and booleans][36856]
3027 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3028 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3029 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3030 * [Corrupted memory after updated to 1.12][36936]
3031 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3032 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3033 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3035 [36381]: https://github.com/rust-lang/rust/issues/36381
3036 [36856]: https://github.com/rust-lang/rust/issues/36856
3037 [36875]: https://github.com/rust-lang/rust/issues/36875
3038 [36924]: https://github.com/rust-lang/rust/issues/36924
3039 [36926]: https://github.com/rust-lang/rust/issues/36926
3040 [36936]: https://github.com/rust-lang/rust/issues/36936
3041 [37026]: https://github.com/rust-lang/rust/issues/37026
3042 [37112]: https://github.com/rust-lang/rust/issues/37112
3043 [37153]: https://github.com/rust-lang/rust/issues/37153
3046 Version 1.12.0 (2016-09-29)
3047 ===========================
3052 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3053 This translation pass is far simpler than the previous AST->LLVM pass, and
3054 creates opportunities to perform new optimizations directly on the MIR. It
3055 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3056 * [`rustc` presents a new, more readable error format, along with
3057 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3058 Most common editors supporting Rust have been updated to work with it. It was
3059 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3064 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3065 This translation pass is far simpler than the previous AST->LLVM pass, and
3066 creates opportunities to perform new optimizations directly on the MIR. It
3067 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3068 * [Print the Rust target name, not the LLVM target name, with
3069 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3070 * [The computation of `TypeId` is correct in some cases where it was previously
3071 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3072 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3073 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3074 `--print relocation-models`, and `--print code-models` print the available
3075 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3076 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3077 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3078 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3079 These targets produce statically-linked binaries. There are no binary release
3085 * [`rustc` presents a new, more readable error format, along with
3086 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3087 Most common editors supporting Rust have been updated to work with it. It was
3088 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3089 * [In error descriptions, references are now described in plain English,
3090 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3091 * [In error type descriptions, unknown numeric types are named `{integer}` or
3092 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3093 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3098 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3099 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3100 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3101 useful](https://github.com/rust-lang/rust/pull/34908)
3102 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3103 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3104 * [Semicolons are properly required as statement delimiters inside
3105 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3106 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3111 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3112 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3113 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3114 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3115 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3116 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3117 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3118 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3119 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3120 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3121 Both on Unix and Windows.
3122 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3123 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3124 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3125 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3126 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3127 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3128 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3129 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3134 * [The `format!` macro and friends now allow a single argument to be formatted
3135 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3136 * [The lifetime bounds on `[T]::binary_search_by` and
3137 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3138 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3139 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3140 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3141 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3142 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3143 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3144 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3145 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3146 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3147 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3148 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3149 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3150 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3151 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3152 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3153 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3154 * [`mpsc::sync_channel` `Receiver`s return any available message before
3155 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3156 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3157 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3162 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3163 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3164 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3165 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3166 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3167 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3168 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3169 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3170 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3171 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3172 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3173 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3174 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3175 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3176 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3177 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3182 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3183 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3188 * [Test binaries now support a `--test-threads` argument to specify the number
3189 of threads used to run tests, and which acts the same as the
3190 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3191 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3192 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3193 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3194 * [Rust releases now come with source packages that can be installed by rustup
3195 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3196 The resulting source code can be used by tools and IDES, located in the
3197 sysroot under `lib/rustlib/src`.
3202 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3203 * Many minor improvements to the documentation.
3204 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3209 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3210 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3211 * [When formatting strings, if "precision" is specified, the "fill",
3212 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3213 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3216 Version 1.11.0 (2016-08-18)
3217 ===========================
3222 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3223 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3224 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3225 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3226 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3231 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3232 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3233 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3234 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3235 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3236 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3237 (in libcore - previously stabilized in libstd)
3238 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3239 (in libcore - previously stabilized in libstd)
3240 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3241 (in libcore - previously stabilized in libstd)
3242 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3243 (in libcore - previously stabilized in libstd)
3244 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3245 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3246 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3247 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3252 * [The `thread_local!` macro supports multiple definitions in a single
3253 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3254 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3255 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3256 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3257 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3258 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3259 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3260 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3265 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3266 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3267 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3268 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3269 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3270 and `-vv` prints warnings for all crates.
3271 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3272 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3273 This provides room for expansion by arbitrary tools.
3274 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3275 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3276 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3277 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3278 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3279 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3280 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3285 * [Caching projections speeds up type check dramatically for some
3286 workloads](https://github.com/rust-lang/rust/pull/33816)
3287 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3288 This hasher is faster, but is believed to provide sufficient
3289 protection from collision attacks.
3290 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3295 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3296 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3297 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3298 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3299 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3304 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3305 * [When emitting debug info, rustc emits frame pointers for closures,
3306 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3307 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3308 * Many more errors have been given error codes and extended
3310 * API documentation continues to be improved, with many new examples
3315 * [rustc no longer hangs when dependencies recursively re-export
3316 submodules](https://github.com/rust-lang/rust/pull/34542)
3317 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3318 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3319 rewritten](https://github.com/rust-lang/rust/pull/33895)
3320 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3321 No targets use this yet, but it works toward AVR support.
3326 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3327 * [The new follow-set rules that place restrictions on `macro_rules!`
3328 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3329 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3330 and has been a warning since 1.10.
3331 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3332 This causes breakage in some corner cases.
3335 Version 1.10.0 (2016-07-07)
3336 ===========================
3341 * [Allow `concat_idents!` in type positions as well as in expression
3342 positions](https://github.com/rust-lang/rust/pull/33735).
3343 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3344 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3345 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3346 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3347 * [`panic!` can be converted to a runtime abort with the
3348 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3349 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3350 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3351 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3352 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3353 Note that Cargo does not yet directly support cdylibs.
3358 * `os::windows::fs::OpenOptionsExt::access_mode`
3359 * `os::windows::fs::OpenOptionsExt::share_mode`
3360 * `os::windows::fs::OpenOptionsExt::custom_flags`
3361 * `os::windows::fs::OpenOptionsExt::attributes`
3362 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3363 * `os::unix::fs::OpenOptionsExt::custom_flags`
3364 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3365 * `Default for sync::Weak`
3366 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3367 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3368 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3369 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3370 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3371 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3372 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3373 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3374 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3375 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3376 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3377 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3378 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3379 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3380 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3381 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3382 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3383 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3384 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3385 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3386 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3387 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3388 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3389 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3390 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3391 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3392 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3393 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3394 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3395 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3396 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3397 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3398 * Read/Write/RawFd impls for `UnixStream`
3399 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3400 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3401 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3402 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3403 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3404 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3405 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3406 * RawFd impls for `UnixListener`
3407 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3408 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3409 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3410 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3411 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3412 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3413 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3414 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3415 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3416 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3417 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3418 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3419 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3420 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3421 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3422 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3423 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3424 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3425 * RawFd impls for `UnixDatagram`
3426 * `{BTree,Hash}Map::values_mut`
3427 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3432 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3433 The semantics of this minor method are subtle and probably not what
3435 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3436 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3437 will fall back to `/dev/urandom` temporarily to avoid blocking
3438 during early boot](https://github.com/rust-lang/rust/pull/33086).
3439 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3440 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3441 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3442 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3443 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3444 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3445 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3449 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3450 This controls the runtime behavior of the `panic!` macro
3451 and can be either "unwind" (the default), or "abort".
3452 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3453 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3454 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3455 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3456 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3457 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3458 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3459 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3460 By default they are retried twice, which can be customized with the
3461 `net.retry` value in `.cargo/config`.
3462 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3463 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3464 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3465 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3466 Makes it possible to install multiple crates in parallel.
3467 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3468 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3469 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3470 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3471 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3472 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3477 * [rustc memory usage was reduced by refactoring the context used for
3478 type checking](https://github.com/rust-lang/rust/pull/33425).
3479 * [Speed up creation of `HashMap`s by caching the random keys used
3480 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3481 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3482 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3483 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3484 10x faster than the previous lookup tables.
3485 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3490 * Many incremental improvements to documentation and rustdoc.
3491 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3492 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3493 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3494 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3495 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3496 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3497 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3502 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3503 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3504 * [`std` no longer prints backtraces on platforms where the running
3505 module must be loaded with `env::current_exe`, which can't be relied
3506 on](https://github.com/rust-lang/rust/pull/33554).
3507 * This release includes std binaries for the i586-unknown-linux-gnu,
3508 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3509 i586 target is for old x86 hardware without SSE2, and the armv7
3510 target is for Android running on modern ARM architectures.
3511 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3512 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3513 * [On Unix the runtime aborts by calling `libc::abort` instead of
3514 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3515 * [Rust is now bootstrapped from the previous release of Rust,
3516 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3521 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3522 * [`target_env` for Linux ARM targets is just `gnu`, not
3523 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3524 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3525 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3526 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3527 Affects how macros are parsed.
3528 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3529 * [Feature-gated attributes on macro-generated macro invocations are
3530 now rejected](https://github.com/rust-lang/rust/pull/32791).
3531 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3532 This caused some minor changes to type inference.
3535 Version 1.9.0 (2016-05-26)
3536 ==========================
3541 * The `#[deprecated]` attribute when applied to an API will generate
3542 warnings when used. The warnings may be suppressed with
3543 `#[allow(deprecated)]`. [RFC 1270].
3544 * [`fn` item types are zero sized, and each `fn` names a unique
3545 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3546 `transmute` on a `fn` type will generate a warning for a few cycles,
3547 then will be converted to an error.
3548 * [Field and method resolution understand visibility, so private
3549 fields and methods cannot prevent the proper use of public fields
3550 and methods][1.9fv].
3551 * [The parser considers unicode codepoints in the
3552 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3558 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3559 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3560 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3561 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3562 * [`str::is_char_boundary`]
3563 * [`<*const T>::as_ref`]
3564 * [`<*mut T>::as_ref`]
3565 * [`<*mut T>::as_mut`]
3566 * [`AsciiExt::make_ascii_uppercase`]
3567 * [`AsciiExt::make_ascii_lowercase`]
3568 * [`char::decode_utf16`]
3569 * [`char::DecodeUtf16`]
3570 * [`char::DecodeUtf16Error`]
3571 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3572 * [`BTreeSet::take`]
3573 * [`BTreeSet::replace`]
3576 * [`HashSet::replace`]
3578 * [`OsString::with_capacity`]
3579 * [`OsString::clear`]
3580 * [`OsString::capacity`]
3581 * [`OsString::reserve`]
3582 * [`OsString::reserve_exact`]
3583 * [`OsStr::is_empty`]
3585 * [`std::os::unix::thread`]
3588 * [`JoinHandleExt::as_pthread_t`]
3589 * [`JoinHandleExt::into_pthread_t`]
3590 * [`HashSet::hasher`]
3591 * [`HashMap::hasher`]
3592 * [`CommandExt::exec`]
3593 * [`File::try_clone`]
3594 * [`SocketAddr::set_ip`]
3595 * [`SocketAddr::set_port`]
3596 * [`SocketAddrV4::set_ip`]
3597 * [`SocketAddrV4::set_port`]
3598 * [`SocketAddrV6::set_ip`]
3599 * [`SocketAddrV6::set_port`]
3600 * [`SocketAddrV6::set_flowinfo`]
3601 * [`SocketAddrV6::set_scope_id`]
3602 * [`slice::copy_from_slice`]
3603 * [`ptr::read_volatile`]
3604 * [`ptr::write_volatile`]
3605 * [`OpenOptions::create_new`]
3606 * [`TcpStream::set_nodelay`]
3607 * [`TcpStream::nodelay`]
3608 * [`TcpStream::set_ttl`]
3609 * [`TcpStream::ttl`]
3610 * [`TcpStream::set_only_v6`]
3611 * [`TcpStream::only_v6`]
3612 * [`TcpStream::take_error`]
3613 * [`TcpStream::set_nonblocking`]
3614 * [`TcpListener::set_ttl`]
3615 * [`TcpListener::ttl`]
3616 * [`TcpListener::set_only_v6`]
3617 * [`TcpListener::only_v6`]
3618 * [`TcpListener::take_error`]
3619 * [`TcpListener::set_nonblocking`]
3620 * [`UdpSocket::set_broadcast`]
3621 * [`UdpSocket::broadcast`]
3622 * [`UdpSocket::set_multicast_loop_v4`]
3623 * [`UdpSocket::multicast_loop_v4`]
3624 * [`UdpSocket::set_multicast_ttl_v4`]
3625 * [`UdpSocket::multicast_ttl_v4`]
3626 * [`UdpSocket::set_multicast_loop_v6`]
3627 * [`UdpSocket::multicast_loop_v6`]
3628 * [`UdpSocket::set_multicast_ttl_v6`]
3629 * [`UdpSocket::multicast_ttl_v6`]
3630 * [`UdpSocket::set_ttl`]
3631 * [`UdpSocket::ttl`]
3632 * [`UdpSocket::set_only_v6`]
3633 * [`UdpSocket::only_v6`]
3634 * [`UdpSocket::join_multicast_v4`]
3635 * [`UdpSocket::join_multicast_v6`]
3636 * [`UdpSocket::leave_multicast_v4`]
3637 * [`UdpSocket::leave_multicast_v6`]
3638 * [`UdpSocket::take_error`]
3639 * [`UdpSocket::connect`]
3640 * [`UdpSocket::send`]
3641 * [`UdpSocket::recv`]
3642 * [`UdpSocket::set_nonblocking`]
3647 * [`std::sync::Once` is poisoned if its initialization function
3649 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3650 * [Most types implement `fmt::Debug`][1.9db].
3651 * [The default buffer size used by `BufReader` and `BufWriter` was
3652 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3653 used by other languages.
3654 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3655 `Duration` additionally implements `*=` and `/=`][1.9ta].
3656 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3657 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3658 * [`Chain` implements `BufRead`][1.9ch].
3659 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3664 * [Cargo can now run concurrently][1.9cc].
3665 * [Top-level overrides allow specific revisions of crates to be
3666 overridden through the entire crate graph][1.9ct]. This is intended
3667 to make upgrades easier for large projects, by allowing crates to be
3668 forked temporarily until they've been upgraded and republished.
3669 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3670 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3671 on the commandline][1.9cf]. `rustc` arguments can also be specified
3672 in the `build.rustflags` configuration key.
3677 * [The time complexity of comparing variables for equivalence during type
3678 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3679 to major compilation time improvement in some scenarios.
3680 * [`ToString` is specialized for `str`, giving it the same performance
3681 as `to_owned`][1.9ts].
3682 * [Spawning processes with `Command::output` no longer creates extra
3684 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3685 for C-like enums][1.9cl].
3690 * [Passing the `--quiet` flag to a test runner will produce
3691 much-abbreviated output][1.9q].
3692 * The Rust Project now publishes std binaries for the
3693 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3694 `i586-pc-windows-msvc` targets.
3699 * [`std::sync::Once` is poisoned if its initialization function
3701 * [It is illegal to define methods with the same name in overlapping
3702 inherent `impl` blocks][1.9sn].
3703 * [`fn` item types are zero sized, and each `fn` names a unique
3704 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3705 `transmute` on a `fn` type will generate a warning for a few cycles,
3706 then will be converted to an error.
3707 * [Improvements to const evaluation may trigger new errors when integer
3708 literals are out of range][1.9ce].
3711 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3712 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3713 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3714 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3715 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3716 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3717 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3718 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3719 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3720 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3721 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3722 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3723 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3724 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3725 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3726 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3727 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3728 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3729 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3730 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3731 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3732 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3733 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3734 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3735 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3736 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3737 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3738 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3739 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3740 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3741 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3742 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3743 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3744 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3745 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3746 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3747 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3748 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3749 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3750 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3751 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3752 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3753 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3754 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3755 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3756 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3757 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3758 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3759 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3760 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3761 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3762 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3763 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3764 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3765 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3766 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3767 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3768 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3769 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3770 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3771 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3772 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3773 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3774 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3775 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3776 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3777 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3778 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3779 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3780 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3781 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3782 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3783 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3784 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3785 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3786 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3787 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3788 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3789 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3790 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3791 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3792 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3793 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3794 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3795 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3796 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3797 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3798 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3799 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3800 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3801 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3802 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3803 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3804 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3805 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3806 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3807 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3808 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3809 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3810 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3811 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3812 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3813 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3814 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3815 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3816 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3817 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3818 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3819 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3820 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3823 Version 1.8.0 (2016-04-14)
3824 ==========================
3829 * Rust supports overloading of compound assignment statements like
3830 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3831 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3832 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3834 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3835 addition to the non-braced form, `struct Foo;`. [RFC 218].
3841 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3842 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3845 * [`ptr::drop_in_place`]
3847 * [`time::SystemTime`]
3849 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3850 * [`Instant::elapsed`]
3851 * [`SystemTime::now`]
3852 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3853 * [`SystemTime::elapsed`]
3854 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3855 * [`SystemTimeError`]
3856 * [`SystemTimeError::duration`]
3857 * Various impls for `SystemTimeError`
3859 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3860 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3861 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3862 * [The `write!` and `writeln!` macros correctly emit errors if any of
3863 their arguments can't be formatted][1.8w].
3864 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3865 * [The Unix-specific `raw` modules, which contain a number of
3866 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3867 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3868 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3869 across platforms was making it difficult to implement `std`
3870 correctly. Those that need these definitions should use the `libc`
3872 * The Unix-specific `MetadataExt` traits, including
3873 `os::unix::fs::MetadataExt`, which expose values such as inode
3874 numbers [no longer return platform-specific types][1.8r], but
3875 instead return widened integers. [RFC 1415].
3876 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3877 * [Atomic loads and stores are not volatile][1.8a].
3878 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3883 * [Inlining hash functions lead to a 3% compile-time improvement in
3884 some workloads][1.8h].
3885 * When using jemalloc, its symbols are [unprefixed so that it
3886 overrides the libc malloc implementation][1.8h]. This means that for
3887 rustc, LLVM is now using jemalloc, which results in a 6%
3888 compile-time improvement on a specific workload.
3889 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3894 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3895 i686-pc-windows-msvc is now considered a tier-1 platform.
3896 * [The `--print targets` flag prints a list of supported targets][1.8t].
3897 * [The `--print cfg` flag prints the `cfg`s defined for the current
3899 * [`rustc` can be built with an new Cargo-based build system, written
3900 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3901 build system. To enable it configure with `configure --rustbuild`.
3902 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3903 variants while also indicating the total number of missing variants
3904 if more than 3][1.8m].
3905 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3906 * The Rust Project now publishes binary releases of the standard
3907 library for a number of tier-2 targets:
3908 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3909 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3910 `x86_64-rumprun-netbsd`. These can be installed with
3911 tools such as [multirust][1.8mr].
3916 * [`cargo init` creates a new Cargo project in the current
3917 directory][1.8ci]. It is otherwise like `cargo new`.
3918 * [Cargo has configuration keys for `-v` and
3919 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3920 `[term]` section of `.cargo/config`.
3921 * [Configuration keys that evaluate to strings or integers can be set
3922 via environment variables][1.8ce]. For example the `build.jobs` key
3923 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3924 precedence over config files.
3925 * [Target-specific dependencies support Rust `cfg` syntax for
3926 describing targets][1.8cfg] so that dependencies for multiple
3927 targets can be specified together. [RFC 1361].
3928 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3929 `RUSTDOC` take precedence over the `build.target-dir`,
3930 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3931 * [The child process tree is killed on Windows when Cargo is
3933 * [The `build.target` configuration value sets the target platform,
3934 like `--target`][1.8ct].
3939 * [Unstable compiler flags have been further restricted][1.8u]. Since
3940 1.0 `-Z` flags have been considered unstable, and other flags that
3941 were considered unstable additionally required passing `-Z
3942 unstable-options` to access. Unlike unstable language and library
3943 features though, these options have been accessible on the stable
3944 release channel. Going forward, *new unstable flags will not be
3945 available on the stable release channel*, and old unstable flags
3946 will warn about their usage. In the future, all unstable flags will
3947 be unavailable on the stable release channel.
3948 * [It is no longer possible to `match` on empty enum variants using
3949 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3950 * The Unix-specific `MetadataExt` traits, including
3951 `os::unix::fs::MetadataExt`, which expose values such as inode
3952 numbers [no longer return platform-specific types][1.8r], but
3953 instead return widened integers. [RFC 1415].
3954 * [Modules sourced from the filesystem cannot appear within arbitrary
3955 blocks, but only within other modules][1.8mf].
3956 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3957 * On Unix, [stack overflow triggers a runtime abort instead of a
3959 * [`Command::spawn` and its equivalents return an error if any of
3960 its command-line arguments contain interior `NUL`s][1.8n].
3961 * [Tuple and unit enum variants from other crates are in the type
3963 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3964 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3965 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3966 instead of `foo.lib`.
3969 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3970 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3971 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3972 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3973 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3974 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3975 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3976 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3977 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3978 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3979 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3980 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3981 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3982 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3983 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3984 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3985 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3986 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3987 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3988 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3989 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3990 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3991 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3992 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3993 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3994 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3995 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3996 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3997 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3998 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3999 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4000 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4001 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4002 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4003 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4004 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4005 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4006 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4007 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4008 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4009 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4010 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4011 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4012 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4013 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4014 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4015 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4016 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4017 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4018 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4019 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4020 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4021 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4022 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4023 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4024 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4025 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4026 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4027 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4028 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4031 Version 1.7.0 (2016-03-03)
4032 ==========================
4039 * [`Path::strip_prefix`][] (renamed from relative_from)
4040 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4042 * [`Ipv4Addr::is_loopback`]
4043 * [`Ipv4Addr::is_private`]
4044 * [`Ipv4Addr::is_link_local`]
4045 * [`Ipv4Addr::is_multicast`]
4046 * [`Ipv4Addr::is_broadcast`]
4047 * [`Ipv4Addr::is_documentation`]
4049 * [`Ipv6Addr::is_unspecified`]
4050 * [`Ipv6Addr::is_loopback`]
4051 * [`Ipv6Addr::is_multicast`]
4054 * [`Vec::as_mut_slice`]
4056 * [`String::as_str`]
4057 * [`String::as_mut_str`]
4059 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4061 * `<[T]>::`[`sort_by_key`]
4062 * checked, saturated, and overflowing operations
4063 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4064 * [`i32::saturating_mul`]
4065 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4066 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4067 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4068 * [`u32::saturating_mul`]
4069 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4070 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4071 * and checked, saturated, and overflowing operations for other primitive types
4073 * [`ffi::IntoStringError`]
4074 * [`CString::into_string`]
4075 * [`CString::into_bytes`]
4076 * [`CString::into_bytes_with_nul`]
4077 * `From<CString> for Vec<u8>`
4079 * [`IntoStringError::into_cstring`]
4080 * [`IntoStringError::utf8_error`]
4081 * `Error for IntoStringError`
4083 * [`std::hash::BuildHasher`]
4084 * [`BuildHasher::Hasher`]
4085 * [`BuildHasher::build_hasher`]
4086 * [`std::hash::BuildHasherDefault`]
4087 * [`HashMap::with_hasher`]
4088 * [`HashMap::with_capacity_and_hasher`]
4089 * [`HashSet::with_hasher`]
4090 * [`HashSet::with_capacity_and_hasher`]
4091 * [`std::collections::hash_map::RandomState`]
4092 * [`RandomState::new`]
4093 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4094 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4095 from bytes is faster.
4096 * [The performance of `LineWriter` (and thus `io::stdout`) was
4097 improved by using `memchr` to search for newlines][1.7m].
4098 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4099 `f64` variants were stabilized previously.
4100 * [`BTreeMap` was rewritten to use less memory and improve the performance
4101 of insertion and iteration, the latter by as much as 5x][1.7bm].
4102 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4103 covariant over their contained type][1.7bt].
4104 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4105 over their contained type][1.7ll].
4106 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4108 * [`Any` is implemented for unsized types][1.7a].
4109 * [`Hash` is implemented for `Duration`][1.7h].
4114 * [When running tests with `--test`, rustdoc will pass `--cfg`
4115 arguments to the compiler][1.7dt].
4116 * [The compiler is built with RPATH information by default][1.7rpa].
4117 This means that it will be possible to run `rustc` when installed in
4118 unusual configurations without configuring the dynamic linker search
4120 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4121 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4122 over `LD_LIBRARY_PATH`.
4127 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4128 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4129 * [The `rerun-if-changed` build script directive no longer causes the
4130 build script to incorrectly run twice in certain scenarios][1.7rr].
4135 * Soundness fixes to the interactions between associated types and
4136 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4137 code that violates the new rules. This is a significant change that
4138 is known to break existing code, so it has emitted warnings for the
4139 new error cases since 1.4 to give crate authors time to adapt. The
4140 details of what is changing are subtle; read the RFC for more.
4141 * [Several bugs in the compiler's visibility calculations were
4142 fixed][1.7v]. Since this was found to break significant amounts of
4143 code, the new errors will be emitted as warnings for several release
4144 cycles, under the `private_in_public` lint.
4145 * Defaulted type parameters were accidentally accepted in positions
4146 that were not intended. In this release, [defaulted type parameters
4147 appearing outside of type definitions will generate a
4148 warning][1.7d], which will become an error in future releases.
4149 * [Parsing "." as a float results in an error instead of 0][1.7p].
4150 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4151 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4153 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4154 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4155 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4156 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4157 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4158 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4159 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4160 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4161 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4162 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4163 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4164 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4165 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4166 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4167 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4168 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4169 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4170 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4171 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4172 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4173 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4174 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4175 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4176 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4177 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4178 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4179 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4180 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4181 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4182 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4183 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4184 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4185 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4186 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4187 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4188 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4189 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4190 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4191 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4192 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4193 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4194 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4195 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4196 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4197 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4198 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4199 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4200 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4201 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4202 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4203 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4204 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4205 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4206 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4207 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4208 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4209 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4210 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4211 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4212 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4213 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4214 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4215 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4216 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4217 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4218 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4219 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4220 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4221 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4222 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4223 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4224 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4225 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4226 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4227 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4228 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4229 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4230 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4231 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4234 Version 1.6.0 (2016-01-21)
4235 ==========================
4240 * The `#![no_std]` attribute causes a crate to not be linked to the
4241 standard library, but only the [core library][1.6co], as described
4242 in [RFC 1184]. The core library defines common types and traits but
4243 has no platform dependencies whatsoever, and is the basis for Rust
4244 software in environments that cannot support a full port of the
4245 standard library, such as operating systems. Most of the core
4246 library is now stable.
4252 [`Read::read_exact`],
4253 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4254 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4255 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4256 [`os::unix::fs::DirBuilderExt`],
4257 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4258 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4259 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4260 [`collections::hash_map::Drain`],
4261 [`collections::hash_map::HashMap::drain`],
4262 [`collections::hash_set::Drain`],
4263 [`collections::hash_set::HashSet::drain`],
4264 [`collections::binary_heap::Drain`],
4265 [`collections::binary_heap::BinaryHeap::drain`],
4266 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4267 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4268 [`RwLock::into_inner`],
4269 [`Iterator::min_by_key`][] (renamed from `min_by`),
4270 [`Iterator::max_by_key`][] (renamed from `max_by`).
4271 * The [core library][1.6co] is stable, as are most of its APIs.
4272 * [The `assert_eq!` macro supports arguments that don't implement
4273 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4275 * Several timer functions that take duration in milliseconds [are
4276 deprecated in favor of those that take `Duration`][1.6ms]. These
4277 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4278 `thread::park_timeout_ms`.
4279 * The algorithm by which `Vec` reserves additional elements was
4280 [tweaked to not allocate excessive space][1.6a] while still growing
4282 * `From` conversions are [implemented from integers to floats][1.6f]
4283 in cases where the conversion is lossless. Thus they are not
4284 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4285 or `f64`. They are also not implemented for `isize` and `usize`
4286 because the implementations would be platform-specific. `From` is
4287 also implemented from `f32` to `f64`.
4288 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4289 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4290 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4291 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4293 * Sorting slices that are already sorted [is 50% faster in some
4299 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4300 * Cargo build scripts can specify their dependencies by emitting the
4301 [`rerun-if-changed`][1.6rr] key.
4302 * crates.io will reject publication of crates with dependencies that
4303 have a wildcard version constraint. Crates with wildcard
4304 dependencies were seen to cause a variety of problems, as described
4305 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4307 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4308 release folder. A variety of artifacts that Cargo failed to clean
4309 are now correctly deleted.
4314 * The `unreachable_code` lint [warns when a function call's argument
4316 * The parser indicates [failures that may be caused by
4317 confusingly-similar Unicode characters][1.6uc]
4318 * Certain macro errors [are reported at definition time][1.6m], not
4324 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4325 environment variable when locating crates. This was a pre-cargo
4326 feature for integrating with the package manager that was
4327 accidentally never removed.
4328 * [A number of bugs were fixed in the privacy checker][1.6p] that
4329 could cause previously-accepted code to break.
4330 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4331 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4332 struct pattern syntax (`Foo(..)`) can no longer be used to match
4333 unit structs. This is a warning now, but will become an error in
4334 future releases. Patterns that share the same name as a const are
4336 * A bug was fixed that causes [rustc not to apply default type
4337 parameters][1.6xc] when resolving certain method implementations of
4338 traits defined in other crates.
4340 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4341 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4342 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4343 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4344 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4345 [1.6co]: http://doc.rust-lang.org/core/index.html
4346 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4347 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4348 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4349 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4350 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4351 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4352 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4353 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4354 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4355 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4356 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4357 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4358 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4359 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4360 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4361 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4362 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4363 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4364 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4365 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4366 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4367 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4368 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4369 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4370 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4371 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4372 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4373 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4374 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4375 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4376 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4377 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4378 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4379 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4380 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4381 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4382 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4383 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4384 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4385 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4386 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4389 Version 1.5.0 (2015-12-10)
4390 ==========================
4392 * ~700 changes, numerous bugfixes
4398 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4399 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4400 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4401 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4402 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4403 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4404 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4405 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4406 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4407 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4408 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4409 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4410 [`Path::read_link`], [`Path::symlink_metadata`],
4411 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4412 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4413 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4414 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4415 [`slice::split_first_mut`], [`slice::split_first`],
4416 [`slice::split_last_mut`], [`slice::split_last`],
4417 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4418 [`str::MatchIndices`], [`str::RMatchIndices`],
4419 [`str::match_indices`], [`str::rmatch_indices`],
4420 [`str::slice_mut_unchecked`], [`string::ParseError`].
4421 * Rust applications hosted on crates.io can be installed locally to
4422 `~/.cargo/bin` with the [`cargo install`] command. Among other
4423 things this makes it easier to augment Cargo with new subcommands:
4424 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4425 invoked as `cargo foo`.
4426 * Crates with wildcard (`*`) dependencies will [emit warnings when
4427 published][1.5w]. In 1.6 it will no longer be possible to publish
4428 crates with wildcard dependencies.
4433 * The rules determining when a particular lifetime must outlive
4434 a particular value (known as '[dropck]') have been [modified
4435 to not rely on parametricity][1.5p].
4436 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4437 and `Arc`][1.5a]. Because these smart pointer types implement
4438 `Deref`, this causes breakage in cases where the interior type
4439 contains methods of the same name.
4440 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4441 that they could drop their content. Soundness fix.
4442 * All method invocations are [properly checked][1.5wf1] for
4443 [well-formedness][1.5wf2]. Soundness fix.
4444 * Traits whose supertraits contain `Self` are [not object
4445 safe][1.5o]. Soundness fix.
4446 * Target specifications support a [`no_default_libraries`][1.5nd]
4447 setting that controls whether `-nodefaultlibs` is passed to the
4448 linker, and in turn the `is_like_windows` setting no longer affects
4449 the `-nodefaultlibs` flag.
4450 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4451 * The `#[inline]` and `#[repr]` attributes [can only appear
4452 in valid locations][1.5at].
4453 * Native libraries linked from the local crate are [passed to
4454 the linker before native libraries from upstream crates][1.5nl].
4455 * Two rarely-used attributes, `#[no_debug]` and
4456 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4457 * Negation of unsigned integers, which has been a warning for
4458 several releases, [is now behind a feature gate and will
4459 generate errors][1.5nu].
4460 * The parser accidentally accepted visibility modifiers on
4461 enum variants, a bug [which has been fixed][1.5ev].
4462 * [A bug was fixed that allowed `use` statements to import unstable
4468 * When evaluating expressions at compile-time that are not
4469 compile-time constants (const-evaluating expressions in non-const
4470 contexts), incorrect code such as overlong bitshifts and arithmetic
4471 overflow will [generate a warning instead of an error][1.5ce],
4472 delaying the error until runtime. This will allow the
4473 const-evaluator to be expanded in the future backwards-compatibly.
4474 * The `improper_ctypes` lint [no longer warns about using `isize` and
4475 `usize` in FFI][1.5ict].
4480 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4482 * `Default` is [implemented for mutable slices][1.5d].
4483 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4484 * There are now `From` conversions [between floating point
4485 types][1.5f] where the conversions are lossless.
4486 * There are now `From` conversions [between integer types][1.5i] where
4487 the conversions are lossless.
4488 * [`fs::Metadata` implements `Clone`][1.5fs].
4489 * The `parse` method [accepts a leading "+" when parsing
4491 * [`AsMut` is implemented for `Vec`][1.5am].
4492 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4493 been optimized][1.5cf] and no longer rely on the default impl.
4494 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4495 `unsafe extern "C"` function types now [implement `Clone`,
4496 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4497 `fmt::Debug` for up to 12 arguments][1.5fp].
4498 * [Dropping `Vec`s is much faster in unoptimized builds when the
4499 element types don't implement `Drop`][1.5dv].
4500 * A bug that caused in incorrect behavior when [combining `VecDeque`
4501 with zero-sized types][1.5vdz] was resolved.
4502 * [`PartialOrd` for slices is faster][1.5po].
4507 * [Crate metadata size was reduced by 20%][1.5md].
4508 * [Improvements to code generation reduced the size of libcore by 3.3
4509 MB and rustc's memory usage by 18MB][1.5m].
4510 * [Improvements to deref translation increased performance in
4511 unoptimized builds][1.5dr].
4512 * Various errors in trait resolution [are deduplicated to only be
4513 reported once][1.5te].
4514 * Rust has preliminary [support for rumprun kernels][1.5rr].
4515 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4517 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4518 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4519 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4520 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4521 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4522 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4523 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4524 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4525 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4526 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4527 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4528 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4529 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4530 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4531 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4532 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4533 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4534 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4535 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4536 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4537 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4538 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4539 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4540 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4541 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4542 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4543 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4544 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4545 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4546 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4547 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4548 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4549 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4550 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4551 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4552 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4553 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4554 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4555 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4556 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4557 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4558 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4559 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4560 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4561 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4562 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4563 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4564 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4565 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4566 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4567 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4568 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4569 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4570 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4571 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4572 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4573 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4574 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4575 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4576 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4577 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4578 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4579 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4580 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4581 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4582 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4583 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4584 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4585 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4586 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4587 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4588 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4589 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4590 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4591 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4592 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4593 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4594 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4595 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4596 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4597 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4598 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4599 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4600 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4601 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4602 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4603 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4604 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4605 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4607 Version 1.4.0 (2015-10-29)
4608 ==========================
4610 * ~1200 changes, numerous bugfixes
4615 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4616 GNU) are now supported and recommended for use.
4621 * [Several changes have been made to fix type soundness and improve
4622 the behavior of associated types][sound]. See [RFC 1214]. Although
4623 we have mostly introduced these changes as warnings this release, to
4624 become errors next release, there are still some scenarios that will
4625 see immediate breakage.
4626 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4627 line breaks in addition to `\n`][crlf].
4628 * [Loans of `'static` lifetime extend to the end of a function][stat].
4629 * [`str::parse` no longer introduces avoidable rounding error when
4630 parsing floating point numbers. Together with earlier changes to
4631 float formatting/output, "round trips" like f.to_string().parse()
4632 now preserve the value of f exactly. Additionally, leading plus
4633 signs are now accepted][fp3].
4639 * `use` statements that import multiple items [can now rename
4640 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4641 * [Binops work correctly on fat pointers][binfat].
4642 * `pub extern crate`, which does not behave as expected, [issues a
4643 warning][pec] until a better solution is found.
4648 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4649 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4650 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4651 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4652 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4653 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4654 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4655 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4656 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4657 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4658 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4659 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4660 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4661 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4662 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4663 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4664 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4665 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4667 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4668 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4669 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4670 `f64::from_str_radix`.
4671 * [Reverse-searching strings is faster with the 'two-way'
4673 * [`std::io::copy` allows `?Sized` arguments][cc].
4674 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4675 [override `count`, `nth` and `last` with an O(1)
4676 implementation][it].
4677 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4678 * [`IntoRawFd` has been added to the Unix-specific prelude,
4679 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4681 * [`Extend<String>` and `FromIterator<String` are both implemented for
4683 * [`IntoIterator` is implemented for references to `Option` and
4685 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4686 Copy`][ext] as part of [RFC 839]. This will cause type inference
4687 breakage in rare situations.
4688 * [`BinaryHeap` implements `Debug`][bh2].
4689 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4691 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4692 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4693 * [String comparison is faster][faststr].
4694 * `&mut T` where `T: std::fmt::Write` [also implements
4695 `std::fmt::Write`][mutw].
4696 * [A stable regression in `VecDeque::push_back` and other
4697 capacity-altering methods that caused panics for zero-sized types
4699 * [Function pointers implement traits for up to 12 parameters][fp2].
4704 * The compiler [no longer uses the 'morestack' feature to prevent
4705 stack overflow][mm]. Instead it uses guard pages and stack
4706 probes (though stack probes are not yet implemented on any platform
4708 * [The compiler matches traits faster when projections are involved][p].
4709 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4711 * [Cargo now displays useful information about what its doing during
4712 `cargo update`][cu].
4714 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4715 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4716 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4717 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4718 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4719 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4720 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4721 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4722 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4723 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4724 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4725 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4726 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4727 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4728 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4729 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4730 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4731 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4732 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4733 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4734 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4735 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4736 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4737 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4738 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4739 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4740 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4741 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4742 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4743 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4744 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4745 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4746 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4747 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4748 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4749 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4750 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4751 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4752 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4753 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4754 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4755 [bh2]: https://github.com/rust-lang/rust/pull/28156
4756 [binfat]: https://github.com/rust-lang/rust/pull/28270
4757 [bm]: https://github.com/rust-lang/rust/pull/28197
4758 [cc]: https://github.com/rust-lang/rust/pull/27531
4759 [crlf]: https://github.com/rust-lang/rust/pull/28034
4760 [cu]: https://github.com/rust-lang/cargo/pull/1931
4761 [d]: https://github.com/rust-lang/rust/pull/27825
4762 [dep]: https://github.com/rust-lang/rust/pull/28339
4763 [es]: https://github.com/rust-lang/rust/pull/27956
4764 [ext]: https://github.com/rust-lang/rust/pull/28094
4765 [faststr]: https://github.com/rust-lang/rust/pull/28338
4766 [ffi]: https://github.com/rust-lang/rust/pull/28779
4767 [fp]: https://github.com/rust-lang/rust/pull/28268
4768 [fp2]: https://github.com/rust-lang/rust/pull/28560
4769 [fp3]: https://github.com/rust-lang/rust/pull/27307
4770 [i]: https://github.com/rust-lang/rust/pull/27451
4771 [into2]: https://github.com/rust-lang/rust/pull/28039
4772 [it]: https://github.com/rust-lang/rust/pull/27652
4773 [mm]: https://github.com/rust-lang/rust/pull/27338
4774 [mutw]: https://github.com/rust-lang/rust/pull/28368
4775 [sound]: https://github.com/rust-lang/rust/pull/27641
4776 [p]: https://github.com/rust-lang/rust/pull/27866
4777 [pec]: https://github.com/rust-lang/rust/pull/28486
4778 [pr]: https://github.com/rust-lang/rust/pull/27896
4779 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4780 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4781 [s]: https://github.com/rust-lang/rust/pull/27474
4782 [stab]: https://github.com/rust-lang/rust/pull/28339
4783 [stat]: https://github.com/rust-lang/rust/pull/28321
4784 [vd]: https://github.com/rust-lang/rust/pull/28494
4786 Version 1.3.0 (2015-09-17)
4787 ==============================
4789 * ~900 changes, numerous bugfixes
4794 * The [new object lifetime defaults][nold] have been [turned
4795 on][nold2] after a cycle of warnings about the change. Now types
4796 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4797 being interpreted as `&'a Box<Trait+'a>` to `&'a
4798 Box<Trait+'static>`.
4799 * [The Rustonomicon][nom] is a new book in the official documentation
4800 that dives into writing unsafe Rust.
4801 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4802 timekeeping is employed by other std APIs, as well as out-of-tree
4808 * The [new object lifetime defaults][nold] have been [turned
4809 on][nold2] after a cycle of warnings about the change.
4810 * There is a known [regression][lr] in how object lifetime elision is
4811 interpreted, the proper solution for which is undetermined.
4812 * The `#[prelude_import]` attribute, an internal implementation
4813 detail, was accidentally stabilized previously. [It has been put
4814 behind the `prelude_import` feature gate][pi]. This change is
4815 believed to break no existing code.
4816 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4817 [more sane for dynamically sized types][dst3]. Code that relied on
4818 the previous behavior is thought to be broken.
4819 * The `dropck` rules, which checks that destructors can't access
4820 destroyed values, [have been updated][dropck] to match the
4821 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4822 cause some previously-compiling code to no longer build.
4827 * The [new object lifetime defaults][nold] have been [turned
4828 on][nold2] after a cycle of warnings about the change.
4829 * Semicolons may [now follow types and paths in
4830 macros](https://github.com/rust-lang/rust/pull/27000).
4831 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4832 [more sane for dynamically sized types][dst3]. Code that relied on
4833 the previous behavior is not known to exist, and suspected to be
4835 * `'static` variables [may now be recursive][st].
4836 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4837 implementations correctly.
4838 * The `dropck` rules, which checks that destructors can't access
4839 destroyed values, [have been updated][dropck] to match the
4845 * The [`Duration`] API, [has been stabilized][ds], as well as the
4846 `std::time` module, which presently contains only `Duration`.
4847 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4848 * The owned C string, [`CString`], implements [`Borrow`] and the
4849 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4850 these allow C strings to be borrowed and cloned in generic code.
4851 * [`CStr`] implements [`Debug`].
4852 * [`AtomicPtr`] implements [`Debug`].
4853 * [`Error`] trait objects [can be downcast to their concrete types][e]
4854 in many common configurations, using the [`is`], [`downcast`],
4855 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4857 * Searching for substrings now [employs the two-way algorithm][search]
4858 instead of doing a naive search. This gives major speedups to a
4859 number of methods, including [`contains`][sc], [`find`][sf],
4860 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4861 [`ends_with`][sew] are also faster.
4862 * The performance of `PartialEq` for slices is [much faster][ps].
4863 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4864 is overridden and optimized by the implementations for scalars.
4865 * The [`Hasher`] trait now has a number of specialized `write_*`
4866 methods for primitive types, for efficiency.
4867 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4868 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4869 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4870 of [`std::error::Error::cause`][iec] also delegates to the inner
4872 * [`process::Child`][pc] gained the [`id`] method, which returns a
4873 `u32` representing the platform-specific process identifier.
4874 * The [`connect`] method on slices is deprecated, replaced by the new
4875 [`join`] method (note that both of these are on the *unstable*
4876 [`SliceConcatExt`] trait, but through the magic of the prelude are
4877 available to stable code anyway).
4878 * The [`Div`] operator is implemented for [`Wrapping`] types.
4879 * [`DerefMut` is implemented for `String`][dms].
4880 * Performance of SipHash (the default hasher for `HashMap`) is
4881 [better for long data][sh].
4882 * [`AtomicPtr`] implements [`Send`].
4883 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4884 are now [specialized to use uninitialized buffers for increased
4886 * Lifetime parameters of foreign functions [are now resolved
4892 * Rust can now, with some coercion, [produce programs that run on
4893 Windows XP][xp], though XP is not considered a supported platform.
4894 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4895 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4896 recommended for use in 1.3, though should be fully-functional
4897 in the [64-bit 1.4 beta][b14].
4898 * On Fedora-based systems installation will [properly configure the
4899 dynamic linker][fl].
4900 * The compiler gained many new extended error descriptions, which can
4901 be accessed with the `--explain` flag.
4902 * The `dropck` pass, which checks that destructors can't access
4903 destroyed values, [has been rewritten][dropck]. This fixes some
4904 soundness holes, and as such will cause some previously-compiling
4905 code to no longer build.
4906 * `rustc` now uses [LLVM to write archive files where possible][ar].
4907 Eventually this will eliminate the compiler's dependency on the ar
4909 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4910 supported FreeBSD on x86_64).
4911 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4912 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4914 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4915 will kill the process instead of leaking][nlp].
4917 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4918 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4919 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4920 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4921 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4922 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4923 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4924 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4925 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4926 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4927 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4928 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4929 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4930 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4931 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4932 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4933 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4934 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4935 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4936 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4937 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4938 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4939 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4940 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4941 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4942 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4943 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4944 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4945 [ar]: https://github.com/rust-lang/rust/pull/26926
4946 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4947 [dms]: https://github.com/rust-lang/rust/pull/26241
4948 [dropck]: https://github.com/rust-lang/rust/pull/27261
4949 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4950 [ds]: https://github.com/rust-lang/rust/pull/26818
4951 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4952 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4953 [dst3]: https://github.com/rust-lang/rust/pull/27351
4954 [e]: https://github.com/rust-lang/rust/pull/24793
4955 [f]: https://github.com/rust-lang/rust/pull/26588
4956 [fb]: https://github.com/rust-lang/rust/pull/26959
4957 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4958 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4959 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4960 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4961 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4962 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4963 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4964 [lic]: https://github.com/rust-lang/rust/pull/26583
4965 [lnu]: https://github.com/rust-lang/rust/pull/27026
4966 [lr]: https://github.com/rust-lang/rust/issues/27248
4967 [lum]: https://github.com/rust-lang/rust/pull/26378
4968 [lur]: https://github.com/rust-lang/rust/pull/26783
4969 [nlp]: https://github.com/rust-lang/rust/pull/27176
4970 [nold2]: https://github.com/rust-lang/rust/pull/27045
4971 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4972 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4973 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4974 [pi]: https://github.com/rust-lang/rust/pull/26699
4975 [ps]: https://github.com/rust-lang/rust/pull/26884
4976 [rte]: https://github.com/rust-lang/rust/pull/26950
4977 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4978 [search]: https://github.com/rust-lang/rust/pull/26327
4979 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4980 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4981 [sh]: https://github.com/rust-lang/rust/pull/27280
4982 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4983 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4984 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4985 [st]: https://github.com/rust-lang/rust/pull/26630
4986 [win1]: https://github.com/rust-lang/rust/pull/26569
4987 [win2]: https://github.com/rust-lang/rust/pull/26741
4988 [win3]: https://github.com/rust-lang/rust/pull/26741
4989 [win4]: https://github.com/rust-lang/rust/pull/27210
4990 [xp]: https://github.com/rust-lang/rust/pull/26569
4992 Version 1.2.0 (2015-08-07)
4993 ==========================
4995 * ~1200 changes, numerous bugfixes
5000 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5001 like `Rc` to contain types without a fixed size, arrays and trait
5002 objects, finally enabling use of `Rc<[T]>` and completing the
5003 implementation of DST.
5004 * [Parallel codegen][parcodegen] is now working again, which can
5005 substantially speed up large builds in debug mode; It also gets
5006 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5007 jobs). It's not enabled by default, but will be "in the near
5008 future". It can be activated with the `-C codegen-units=N` flag to
5010 * This is the first release with [experimental support for linking
5011 with the MSVC linker and lib C on Windows (instead of using the GNU
5012 variants via MinGW)][win]. It is yet recommended only for the most
5013 intrepid Rustaceans.
5014 * Benchmark compilations are showing a 30% improvement in
5015 bootstrapping over 1.1.
5020 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5021 unicode case mapping, which is a previously-planned change in
5022 behavior and considered a bugfix.
5023 * [`mem::align_of`] now specifies [the *minimum alignment* for
5024 T][align], which is usually the alignment programs are interested
5025 in, and the same value reported by clang's
5026 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5028 * [The `#[packed]` attribute is no longer silently accepted by the
5029 compiler][packed]. This attribute did nothing and code that
5030 mentioned it likely did not work as intended.
5031 * Associated type defaults are [now behind the
5032 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5033 defaults *did not work*, but could be mentioned syntactically. As
5034 such this breakage has minimal impact.
5039 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5040 matching against dereferenceable values.
5045 * The [`Extend`] trait, which grows a collection from an iterator, is
5046 implemented over iterators of references, for `String`, `Vec`,
5047 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5048 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5049 * The [`iter::once`] function returns an iterator that yields a single
5050 element, and [`iter::empty`] returns an iterator that yields no
5052 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5053 over substring matches.
5054 * [`Cell`] and [`RefCell`] both implement `Eq`.
5055 * A number of methods for wrapping arithmetic are added to the
5056 integral types, [`wrapping_div`], [`wrapping_rem`],
5057 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5058 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5059 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5060 type.. It is illegal for the default arithmetic operations in Rust
5061 to overflow; the desire to wrap must be explicit.
5062 * The `{:#?}` formatting specifier [displays the alternate,
5063 pretty-printed][debugfmt] form of the `Debug` formatter. This
5064 feature was actually introduced prior to 1.0 with little
5066 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5067 for writing data to formatted strings, similar to [`io::Write`].
5068 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5069 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5070 are used by code generators to emit implementations of [`Debug`].
5071 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5072 methods that convert case, following Unicode case mapping.
5073 * It is now easier to handle poisoned locks. The [`PoisonError`]
5074 type, returned by failing lock operations, exposes `into_inner`,
5075 `get_ref`, and `get_mut`, which all give access to the inner lock
5076 guard, and allow the poisoned lock to continue to operate. The
5077 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5078 poisoned lock without attempting to take the lock.
5079 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5080 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5081 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5082 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5084 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5090 * `rustc` employs smarter heuristics for guessing at [typos].
5091 * `rustc` emits more efficient code for [no-op conversions between
5092 unsafe pointers][nop].
5093 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5094 resulting in faster compile times and smaller code.
5096 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5097 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5098 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5099 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5100 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5101 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5102 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5103 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5104 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5105 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5106 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5107 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5108 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5109 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5110 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5111 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5112 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5113 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5114 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5115 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5116 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5117 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5118 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5119 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5120 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5121 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5122 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5123 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5124 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5125 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5126 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5127 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5128 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5129 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5130 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5131 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5132 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5133 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5134 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5135 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5136 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5137 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5138 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5139 [align]: https://github.com/rust-lang/rust/pull/25646
5140 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5141 [typos]: https://github.com/rust-lang/rust/pull/26087
5142 [nop]: https://github.com/rust-lang/rust/pull/26336
5143 [fat]: https://github.com/rust-lang/rust/pull/26411
5144 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5145 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5146 [packed]: https://github.com/rust-lang/rust/pull/25541
5147 [ad]: https://github.com/rust-lang/rust/pull/27382
5148 [win]: https://github.com/rust-lang/rust/pull/25350
5150 Version 1.1.0 (2015-06-25)
5151 =========================
5153 * ~850 changes, numerous bugfixes
5158 * The [`std::fs` module has been expanded][fs] to expand the set of
5159 functionality exposed:
5160 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5161 don't incur a syscall on some platforms.
5162 * A `symlink_metadata` function has been added.
5163 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5164 access to all underlying information.
5165 * The compiler now contains extended explanations of many errors. When an error
5166 with an explanation occurs the compiler suggests using the `--explain` flag
5167 to read the explanation. Error explanations are also [available online][err-index].
5168 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5169 well as other work, the time to bootstrap the compiler decreased by
5175 * The [`str::split_whitespace`] method splits a string on unicode
5176 whitespace boundaries.
5177 * On both Windows and Unix, new extension traits provide conversion of
5178 I/O types to and from the underlying system handles. On Unix, these
5179 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5180 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5181 `TcpListener`, and `UpdSocket`. Further implementations for
5182 `std::process` will be stabilized later.
5183 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5184 Windows, symlinks can be created with
5185 `std::os::windows::symlink_dir` and
5186 `std::os::windows::symlink_file`.
5187 * The `mpsc::Receiver` type can now be converted into an iterator with
5188 `into_iter` on the [`IntoIterator`] trait.
5189 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5190 implementation of the [`From`] trait.
5191 * The `Debug` implementation for `RangeFull` [creates output that is
5192 more consistent with other implementations][rf].
5193 * [`Debug` is implemented for `File`][file].
5194 * The `Default` implementation for `Arc` [no longer requires `Sync +
5196 * [The `Iterator` methods `count`, `nth`, and `last` have been
5197 overridden for slices to have O(1) performance instead of O(n)][si].
5198 * Incorrect handling of paths on Windows has been improved in both the
5199 compiler and the standard library.
5200 * [`AtomicPtr` gained a `Default` implementation][ap].
5201 * In accordance with Rust's policy on arithmetic overflow `abs` now
5202 [panics on overflow when debug assertions are enabled][abs].
5203 * The [`Cloned`] iterator, which was accidentally left unstable for
5204 1.0 [has been stabilized][c].
5205 * The [`Incoming`] iterator, which iterates over incoming TCP
5206 connections, and which was accidentally unnamable in 1.0, [is now
5207 properly exported][inc].
5208 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5209 `sift_up` or `sift_down` panic][bh].
5210 * The [`split_off`] method of `LinkedList` [no longer corrupts
5211 the list in certain scenarios][ll].
5216 * Type checking performance [has improved notably][sk] with
5217 [multiple improvements][pre].
5218 * The compiler [suggests code changes][ch] for more errors.
5219 * rustc and it's build system have experimental support for [building
5220 toolchains against MUSL][m] instead of glibc on Linux.
5221 * The compiler defines the `target_env` cfg value, which is used for
5222 distinguishing toolchains that are otherwise for the same
5223 platform. Presently this is set to `gnu` for common GNU Linux
5224 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5225 * The [`cargo rustc`][crc] command invokes a build with custom flags
5227 * [Android executables are always position independent][pie].
5228 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5231 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5232 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5233 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5234 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5235 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5236 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5237 [rf]: https://github.com/rust-lang/rust/pull/24491
5238 [err-index]: https://doc.rust-lang.org/error-index.html
5239 [sk]: https://github.com/rust-lang/rust/pull/24615
5240 [pre]: https://github.com/rust-lang/rust/pull/25323
5241 [file]: https://github.com/rust-lang/rust/pull/24598
5242 [ch]: https://github.com/rust-lang/rust/pull/24683
5243 [arc]: https://github.com/rust-lang/rust/pull/24695
5244 [si]: https://github.com/rust-lang/rust/pull/24701
5245 [ap]: https://github.com/rust-lang/rust/pull/24834
5246 [m]: https://github.com/rust-lang/rust/pull/24777
5247 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5248 [crc]: https://github.com/rust-lang/cargo/pull/1568
5249 [pie]: https://github.com/rust-lang/rust/pull/24953
5250 [abs]: https://github.com/rust-lang/rust/pull/25441
5251 [c]: https://github.com/rust-lang/rust/pull/25496
5252 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5253 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5254 [inc]: https://github.com/rust-lang/rust/pull/25522
5255 [bh]: https://github.com/rust-lang/rust/pull/25856
5256 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5257 [ll]: https://github.com/rust-lang/rust/pull/26022
5258 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5259 [drop]: https://github.com/rust-lang/rust/pull/24935
5261 Version 1.0.0 (2015-05-15)
5262 ========================
5264 * ~1500 changes, numerous bugfixes
5269 * The vast majority of the standard library is now `#[stable]`. It is
5270 no longer possible to use unstable features with a stable build of
5272 * Many popular crates on [crates.io] now work on the stable release
5274 * Arithmetic on basic integer types now [checks for overflow in debug
5280 * Several [restrictions have been added to trait coherence][coh] in
5281 order to make it easier for upstream authors to change traits
5282 without breaking downstream code.
5283 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5284 improve error messages and macro behavior. For example, `0b1234` is
5285 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5286 * Trait bounds [are always invariant][inv], eliminating the need for
5287 the `PhantomFn` and `MarkerTrait` lang items, which have been
5289 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5290 "foo" as bar` syntax has been replaced with `extern crate foo as
5291 bar`, and Cargo now automatically translates "-" in *package* names
5292 to underscore for the crate name.
5293 * [Lifetime shadowing is an error][lt].
5294 * [`Send` no longer implies `'static`][send-rfc].
5295 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5296 `MyType::default()`.
5297 * Primitive types [now have inherent methods][prim-inherent],
5298 obviating the need for extension traits like `SliceExt`.
5299 * Methods with `Self: Sized` in their `where` clause are [considered
5300 object-safe][self-sized], allowing many extension traits like
5301 `IteratorExt` to be merged into the traits they extended.
5302 * You can now [refer to associated types][assoc-where] whose
5303 corresponding trait bounds appear only in a `where` clause.
5304 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5305 like `Send` and `Sync` are now library-defined.
5306 * A [Reflect trait][reflect] was introduced, which means that
5307 downcasting via the `Any` trait is effectively limited to concrete
5308 types. This helps retain the potentially-important "parametricity"
5309 property: generic code cannot behave differently for different type
5310 arguments except in minor ways.
5311 * The `unsafe_destructor` feature is now deprecated in favor of the
5312 [new `dropck`][dropck]. This change is a major reduction in unsafe
5318 * The `thread_local` module [has been renamed to `std::thread`][th].
5319 * The methods of `IteratorExt` [have been moved to the `Iterator`
5321 * Several traits that implement Rust's conventions for type
5322 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5323 [centralized in the `std::convert` module][con].
5324 * The `FromError` trait [was removed in favor of `From`][fe].
5325 * The basic sleep function [has moved to
5326 `std::thread::sleep_ms`][slp].
5327 * The `splitn` function now takes an `n` parameter that represents the
5328 number of items yielded by the returned iterator [instead of the
5329 number of 'splits'][spl].
5330 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5331 * [Derived implementations of `PartialOrd` now order enums according
5332 to their explicitly-assigned discriminants][po].
5333 * [Methods for searching strings are generic over `Pattern`s][pat],
5334 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5336 * [In method resolution, object methods are resolved before inherent
5338 * [`String::from_str` has been deprecated in favor of the `From` impl,
5339 `String::from`][sf].
5340 * [`io::Error` implements `Sync`][ios].
5341 * [The `words` method on `&str` has been replaced with
5342 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5344 * The new path and IO modules are complete and `#[stable]`. This
5345 was the major library focus for this cycle.
5346 * The path API was [revised][path-normalize] to normalize `.`,
5347 adjusting the tradeoffs in favor of the most common usage.
5348 * A large number of remaining APIs in `std` were also stabilized
5349 during this cycle; about 75% of the non-deprecated API surface
5351 * The new [string pattern API][string-pattern] landed, which makes
5352 the string slice API much more internally consistent and flexible.
5353 * A new set of [generic conversion traits][conversion] replaced
5354 many existing ad hoc traits.
5355 * Generic numeric traits were [completely removed][num-traits]. This
5356 was made possible thanks to inherent methods for primitive types,
5357 and the removal gives maximal flexibility for designing a numeric
5358 hierarchy in the future.
5359 * The `Fn` traits are now related via [inheritance][fn-inherit]
5360 and provide ergonomic [blanket implementations][fn-blanket].
5361 * The `Index` and `IndexMut` traits were changed to
5362 [take the index by value][index-value], enabling code like
5363 `hash_map["string"]` to work.
5364 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5365 `Copy` data is known to be `Clone` as well.
5370 * Many errors now have extended explanations that can be accessed with
5371 the `--explain` flag to `rustc`.
5372 * Many new examples have been added to the standard library
5374 * rustdoc has received a number of improvements focused on completion
5376 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5377 * Much headway was made on ecosystem-wide CI, making it possible
5378 to [compare builds for breakage][ci-compare].
5381 [crates.io]: http://crates.io
5382 [clo]: https://github.com/rust-lang/rust/pull/24034
5383 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5384 [con]: https://github.com/rust-lang/rust/pull/23875
5385 [cr]: https://github.com/rust-lang/rust/pull/23419
5386 [fe]: https://github.com/rust-lang/rust/pull/23879
5387 [ie]: https://github.com/rust-lang/rust/pull/23300
5388 [inv]: https://github.com/rust-lang/rust/pull/23938
5389 [ios]: https://github.com/rust-lang/rust/pull/24133
5390 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5391 [lt]: https://github.com/rust-lang/rust/pull/24057
5392 [meth]: https://github.com/rust-lang/rust/pull/24056
5393 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5394 [po]: https://github.com/rust-lang/rust/pull/24270
5395 [sf]: https://github.com/rust-lang/rust/pull/24517
5396 [slp]: https://github.com/rust-lang/rust/pull/23949
5397 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5398 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5399 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5400 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5401 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5402 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5403 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5404 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5405 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5406 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5407 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5408 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5409 [reflect]: https://github.com/rust-lang/rust/pull/23712
5410 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5411 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5412 [index-value]: https://github.com/rust-lang/rust/pull/23601
5413 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5414 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5415 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5416 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5417 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5418 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5421 Version 1.0.0-alpha.2 (2015-02-20)
5422 =====================================
5424 * ~1300 changes, numerous bugfixes
5428 * The various I/O modules were [overhauled][io-rfc] to reduce
5429 unnecessary abstractions and provide better interoperation with
5430 the underlying platform. The old `io` module remains temporarily
5432 * The standard library now [participates in feature gating][feat],
5433 so use of unstable libraries now requires a `#![feature(...)]`
5434 attribute. The impact of this change is [described on the
5435 forum][feat-forum]. [RFC][feat-rfc].
5439 * `for` loops [now operate on the `IntoIterator` trait][into],
5440 which eliminates the need to call `.iter()`, etc. to iterate
5441 over collections. There are some new subtleties to remember
5442 though regarding what sort of iterators various types yield, in
5443 particular that `for foo in bar { }` yields values from a move
5444 iterator, destroying the original collection. [RFC][into-rfc].
5445 * Objects now have [default lifetime bounds][obj], so you don't
5446 have to write `Box<Trait+'static>` when you don't care about
5447 storing references. [RFC][obj-rfc].
5448 * In types that implement `Drop`, [lifetimes must outlive the
5449 value][drop]. This will soon make it possible to safely
5450 implement `Drop` for types where `#[unsafe_destructor]` is now
5451 required. Read the [gorgeous RFC][drop-rfc] for details.
5452 * The fully qualified <T as Trait>::X syntax lets you set the Self
5453 type for a trait method or associated type. [RFC][ufcs-rfc].
5454 * References to types that implement `Deref<U>` now [automatically
5455 coerce to references][deref] to the dereferenced type `U`,
5456 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5457 should eliminate many unsightly uses of `&*`, as when converting
5458 from references to vectors into references to
5459 slices. [RFC][deref-rfc].
5460 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5461 `|:|`) is obsolete and closure kind is inferred from context.
5462 * [`Self` is a keyword][Self].
5466 * The `Show` and `String` formatting traits [have been
5467 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5468 their related purposes. Automatically getting a string
5469 conversion to use with `format!("{:?}", something_to_debug)` is
5470 now written `#[derive(Debug)]`.
5471 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5472 OsStr}`, provide strings in platform-specific encodings for easier
5473 interop with system APIs. [RFC][osstr-rfc].
5474 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5475 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5476 creating raw pointers.
5480 * Certain long error messages of the form 'expected foo found bar'
5481 are now [split neatly across multiple
5482 lines][multiline]. Examples in the PR.
5483 * On Unix Rust can be [uninstalled][un] by running
5484 `/usr/local/lib/rustlib/uninstall.sh`.
5485 * The `#[rustc_on_unimplemented]` attribute, requiring the
5486 'on_unimplemented' feature, lets rustc [display custom error
5487 messages when a trait is expected to be implemented for a type
5492 * Rust is tested against a [LALR grammar][lalr], which parses
5493 almost all the Rust files that rustc does.
5495 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5496 [close]: https://github.com/rust-lang/rust/pull/21843
5497 [deref]: https://github.com/rust-lang/rust/pull/21351
5498 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5499 [drop]: https://github.com/rust-lang/rust/pull/21972
5500 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5501 [feat]: https://github.com/rust-lang/rust/pull/21248
5502 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5503 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5504 [fmt]: https://github.com/rust-lang/rust/pull/21457
5505 [into]: https://github.com/rust-lang/rust/pull/20790
5506 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5507 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5508 [lalr]: https://github.com/rust-lang/rust/pull/21452
5509 [multiline]: https://github.com/rust-lang/rust/pull/19870
5510 [obj]: https://github.com/rust-lang/rust/pull/22230
5511 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5512 [onun]: https://github.com/rust-lang/rust/pull/20889
5513 [osstr]: https://github.com/rust-lang/rust/pull/21488
5514 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5515 [Self]: https://github.com/rust-lang/rust/pull/22158
5516 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5517 [un]: https://github.com/rust-lang/rust/pull/22256
5520 Version 1.0.0-alpha (2015-01-09)
5521 ==================================
5523 * ~2400 changes, numerous bugfixes
5527 * The language itself is considered feature complete for 1.0,
5528 though there will be many usability improvements and bugfixes
5529 before the final release.
5530 * Nearly 50% of the public API surface of the standard library has
5531 been declared 'stable'. Those interfaces are unlikely to change
5533 * The long-running debate over integer types has been
5534 [settled][ints]: Rust will ship with types named `isize` and
5535 `usize`, rather than `int` and `uint`, for pointer-sized
5536 integers. Guidelines will be rolled out during the alpha cycle.
5537 * Most crates that are not `std` have been moved out of the Rust
5538 distribution into the Cargo ecosystem so they can evolve
5539 separately and don't need to be stabilized as quickly, including
5540 'time', 'getopts', 'num', 'regex', and 'term'.
5541 * Documentation continues to be expanded with more API coverage, more
5542 examples, and more in-depth explanations. The guides have been
5543 consolidated into [The Rust Programming Language][trpl].
5544 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5545 * All official Rust binary installers now come with [Cargo], the
5546 Rust package manager.
5550 * Closures have been [completely redesigned][unboxed] to be
5551 implemented in terms of traits, can now be used as generic type
5552 bounds and thus monomorphized and inlined, or via an opaque
5553 pointer (boxed) as in the old system. The new system is often
5554 referred to as 'unboxed' closures.
5555 * Traits now support [associated types][assoc], allowing families
5556 of related types to be defined together and used generically in
5558 * Enum variants are [namespaced by their type names][enum].
5559 * [`where` clauses][where] provide a more versatile and attractive
5560 syntax for specifying generic bounds, though the previous syntax
5562 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5564 * Rust [no longer has a runtime][rt] of any description, and only
5565 supports OS threads, not green threads.
5566 * At long last, Rust has been overhauled for 'dynamically-sized
5567 types' ([DST]), which integrates 'fat pointers' (object types,
5568 arrays, and `str`) more deeply into the type system, making it
5570 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5571 `..j` that produce range types and which, when combined with the
5572 `Index` operator and multidispatch, leads to a convenient slice
5574 * The new range syntax revealed an ambiguity in the fixed-length
5575 array syntax, so now fixed length arrays [are written `[T;
5577 * The `Copy` trait is no longer implemented automatically. Unsafe
5578 pointers no longer implement `Sync` and `Send` so types
5579 containing them don't automatically either. `Sync` and `Send`
5580 are now 'unsafe traits' so one can "forcibly" implement them via
5581 `unsafe impl` if a type confirms to the requirements for them
5582 even though the internals do not (e.g. structs containing unsafe
5583 pointers like `Arc`). These changes are intended to prevent some
5584 footguns and are collectively known as [opt-in built-in
5585 traits][oibit] (though `Sync` and `Send` will soon become pure
5586 library types unknown to the compiler).
5587 * Operator traits now take their operands [by value][ops], and
5588 comparison traits can use multidispatch to compare one type
5589 against multiple other types, allowing e.g. `String` to be
5590 compared with `&str`.
5591 * `if let` and `while let` are no longer feature-gated.
5592 * Rust has adopted a more [uniform syntax for escaping unicode
5593 characters][unicode].
5594 * `macro_rules!` [has been declared stable][mac]. Though it is a
5595 flawed system it is sufficiently popular that it must be usable
5596 for 1.0. Effort has gone into [future-proofing][mac-future] it
5597 in ways that will allow other macro systems to be developed in
5598 parallel, and won't otherwise impact the evolution of the
5600 * The prelude has been [pared back significantly][prelude] such
5601 that it is the minimum necessary to support the most pervasive
5602 code patterns, and through [generalized where clauses][where]
5603 many of the prelude extension traits have been consolidated.
5604 * Rust's rudimentary reflection [has been removed][refl], as it
5605 incurred too much code generation for little benefit.
5606 * [Struct variants][structvars] are no longer feature-gated.
5607 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5608 known as 'higher-ranked trait bounds', this crucially allows
5609 unboxed closures to work.
5610 * Macros invocations surrounded by parens or square brackets and
5611 not terminated by a semicolon are [parsed as
5612 expressions][macros], which makes expressions like `vec![1i32,
5613 2, 3].len()` work as expected.
5614 * Trait objects now implement their traits automatically, and
5615 traits that can be coerced to objects now must be [object
5617 * Automatically deriving traits is now done with `#[derive(...)]`
5618 not `#[deriving(...)]` for [consistency with other naming
5619 conventions][derive].
5620 * Importing the containing module or enum at the same time as
5621 items or variants they contain is [now done with `self` instead
5622 of `mod`][self], as in use `foo::{self, bar}`
5623 * Glob imports are no longer feature-gated.
5624 * The `box` operator and `box` patterns have been feature-gated
5625 pending a redesign. For now unique boxes should be allocated
5626 like other containers, with `Box::new`.
5630 * A [series][coll1] of [efforts][coll2] to establish
5631 [conventions][coll3] for collections types has resulted in API
5632 improvements throughout the standard library.
5633 * New [APIs for error handling][err] provide ergonomic interop
5634 between error types, and [new conventions][err-conv] describe
5635 more clearly the recommended error handling strategies in Rust.
5636 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5637 it is easier to discuss failure in the context of error handling
5638 without making clarifications as to whether you are referring to
5639 the 'fail' macro or failure more generally.
5640 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5641 syscall when available.
5642 * The 'serialize' crate has been renamed 'rustc-serialize' and
5643 moved out of the distribution to Cargo. Although it is widely
5644 used now, it is expected to be superseded in the near future.
5645 * The `Show` formatter, typically implemented with
5646 `#[derive(Show)]` is [now requested with the `{:?}`
5647 specifier][show] and is intended for use by all types, for uses
5648 such as `println!` debugging. The new `String` formatter must be
5649 implemented by hand, uses the `{}` specifier, and is intended
5650 for full-fidelity conversions of things that can logically be
5651 represented as strings.
5655 * [Flexible target specification][flex] allows rustc's code
5656 generation to be configured to support otherwise-unsupported
5658 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5659 respective debuggers with Rust-appropriate pretty-printing.
5660 * The Windows installation of Rust is distributed with the
5661 MinGW components currently required to link binaries on that
5666 * Nullable enum optimizations have been extended to more types so
5667 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5668 space than the inner types themselves.
5669 * Work has begun on supporting AArch64.
5671 [Cargo]: https://crates.io
5672 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5673 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5674 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5675 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5676 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5677 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5678 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5679 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5680 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5681 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5682 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5683 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5684 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5685 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5686 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5687 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5688 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5689 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5690 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5691 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5692 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5693 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5694 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5695 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5696 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5697 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5698 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5699 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5700 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5701 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5702 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5703 [trpl]: https://doc.rust-lang.org/book/index.html
5704 [rbe]: http://rustbyexample.com/
5707 Version 0.12.0 (2014-10-09)
5708 =============================
5710 * ~1900 changes, numerous bugfixes
5714 * The introductory documentation (now called The Rust Guide) has
5715 been completely rewritten, as have a number of supplementary
5717 * Rust's package manager, Cargo, continues to improve and is
5718 sometimes considered to be quite awesome.
5719 * Many API's in `std` have been reviewed and updated for
5720 consistency with the in-development Rust coding
5721 guidelines. The standard library documentation tracks
5722 stabilization progress.
5723 * Minor libraries have been moved out-of-tree to the rust-lang org
5724 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5725 be installed with Cargo.
5726 * Lifetime elision allows lifetime annotations to be left off of
5727 function declarations in many common scenarios.
5728 * Rust now works on 64-bit Windows.
5731 * Indexing can be overloaded with the `Index` and `IndexMut`
5733 * The `if let` construct takes a branch only if the `let` pattern
5734 matches, currently behind the 'if_let' feature gate.
5735 * 'where clauses', a more flexible syntax for specifying trait
5736 bounds that is more aesthetic, have been added for traits and
5737 free functions. Where clauses will in the future make it
5738 possible to constrain associated types, which would be
5739 impossible with the existing syntax.
5740 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5741 the 'slicing_syntax' feature gate, and can be overloaded with
5742 the `Slice` or `SliceMut` traits.
5743 * The syntax for matching of sub-slices has been changed to use a
5744 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5745 consistency with other uses of `..` and to future-proof
5746 potential additional uses of the syntax.
5747 * The syntax for matching inclusive ranges in patterns has changed
5748 from `0..3` to `0...4` to be consistent with the exclusive range
5750 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5751 c]`) has been put behind the 'advanced_slice_patterns' feature
5752 gate and may be removed in the future.
5753 * Components of tuples and tuple structs can be extracted using
5754 the `value.0` syntax, currently behind the `tuple_indexing`
5756 * The `#[crate_id]` attribute is no longer supported; versioning
5757 is handled by the package manager.
5758 * Renaming crate imports are now written `extern crate foo as bar`
5759 instead of `extern crate bar = foo`.
5760 * Renaming use statements are now written `use foo as bar` instead
5762 * `let` and `match` bindings and argument names in macros are now
5764 * The new, more efficient, closure types ('unboxed closures') have
5765 been added under a feature gate, 'unboxed_closures'. These will
5766 soon replace the existing closure types, once higher-ranked
5767 trait lifetimes are added to the language.
5768 * `move` has been added as a keyword, for indicating closures
5769 that capture by value.
5770 * Mutation and assignment is no longer allowed in pattern guards.
5771 * Generic structs and enums can now have trait bounds.
5772 * The `Share` trait is now called `Sync` to free up the term
5773 'shared' to refer to 'shared reference' (the default reference
5775 * Dynamically-sized types have been mostly implemented,
5776 unifying the behavior of fat-pointer types with the rest of the
5778 * As part of dynamically-sized types, the `Sized` trait has been
5779 introduced, which qualifying types implement by default, and
5780 which type parameters expect by default. To specify that a type
5781 parameter does not need to be sized, write `<Sized? T>`. Most
5782 types are `Sized`, notable exceptions being unsized arrays
5783 (`[T]`) and trait types.
5784 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5785 * Lifetime bounds can now be applied to type parameters and object
5787 * The old, reference counted GC type, `Gc<T>` which was once
5788 denoted by the `@` sigil, has finally been removed. GC will be
5789 revisited in the future.
5792 * Library documentation has been improved for a number of modules.
5793 * Bit-vectors, collections::bitv has been modernized.
5794 * The url crate is deprecated in favor of
5795 http://github.com/servo/rust-url, which can be installed with
5797 * Most I/O stream types can be cloned and subsequently closed from
5799 * A `std::time::Duration` type has been added for use in I/O
5800 methods that rely on timers, as well as in the 'time' crate's
5801 `Timespec` arithmetic.
5802 * The runtime I/O abstraction layer that enabled the green thread
5803 scheduler to do non-thread-blocking I/O has been removed, along
5804 with the libuv-based implementation employed by the green thread
5805 scheduler. This will greatly simplify the future I/O work.
5806 * `collections::btree` has been rewritten to have a more
5807 idiomatic and efficient design.
5810 * rustdoc output now indicates the stability levels of API's.
5811 * The `--crate-name` flag can specify the name of the crate
5812 being compiled, like `#[crate_name]`.
5813 * The `-C metadata` specifies additional metadata to hash into
5814 symbol names, and `-C extra-filename` specifies additional
5815 information to put into the output filename, for use by the
5816 package manager for versioning.
5817 * debug info generation has continued to improve and should be
5818 more reliable under both gdb and lldb.
5819 * rustc has experimental support for compiling in parallel
5820 using the `-C codegen-units` flag.
5821 * rustc no longer encodes rpath information into binaries by
5825 * Stack usage has been optimized with LLVM lifetime annotations.
5826 * Official Rust binaries on Linux are more compatible with older
5827 kernels and distributions, built on CentOS 5.10.
5830 Version 0.11.0 (2014-07-02)
5831 ==========================
5833 * ~1700 changes, numerous bugfixes
5836 * ~[T] has been removed from the language. This type is superseded by
5838 * ~str has been removed from the language. This type is superseded by
5840 * ~T has been removed from the language. This type is superseded by the
5842 * @T has been removed from the language. This type is superseded by the
5843 standard library's std::gc::Gc<T> type.
5844 * Struct fields are now all private by default.
5845 * Vector indices and shift amounts are both required to be a `uint`
5846 instead of any integral type.
5847 * Byte character, byte string, and raw byte string literals are now all
5848 supported by prefixing the normal literal with a `b`.
5849 * Multiple ABIs are no longer allowed in an ABI string
5850 * The syntax for lifetimes on closures/procedures has been tweaked
5851 slightly: `<'a>|A, B|: 'b + K -> T`
5852 * Floating point modulus has been removed from the language; however it
5853 is still provided by a library implementation.
5854 * Private enum variants are now disallowed.
5855 * The `priv` keyword has been removed from the language.
5856 * A closure can no longer be invoked through a &-pointer.
5857 * The `use foo, bar, baz;` syntax has been removed from the language.
5858 * The transmute intrinsic no longer works on type parameters.
5859 * Statics now allow blocks/items in their definition.
5860 * Trait bounds are separated from objects with + instead of : now.
5861 * Objects can no longer be read while they are mutably borrowed.
5862 * The address of a static is now marked as insignificant unless the
5863 #[inline(never)] attribute is placed it.
5864 * The #[unsafe_destructor] attribute is now behind a feature gate.
5865 * Struct literals are no longer allowed in ambiguous positions such as
5866 if, while, match, and for..in.
5867 * Declaration of lang items and intrinsics are now feature-gated by
5869 * Integral literals no longer default to `int`, and floating point
5870 literals no longer default to `f64`. Literals must be suffixed with an
5871 appropriate type if inference cannot determine the type of the
5873 * The Box<T> type is no longer implicitly borrowed to &mut T.
5874 * Procedures are now required to not capture borrowed references.
5877 * The standard library is now a "facade" over a number of underlying
5878 libraries. This means that development on the standard library should
5879 be speedier due to smaller crates, as well as a clearer line between
5881 * A new library, libcore, lives under the standard library's facade
5882 which is Rust's "0-assumption" library, suitable for embedded and
5883 kernel development for example.
5884 * A regex crate has been added to the standard distribution. This crate
5885 includes statically compiled regular expressions.
5886 * The unwrap/unwrap_err methods on Result require a Show bound for
5887 better error messages.
5888 * The return types of the std::comm primitives have been centralized
5889 around the Result type.
5890 * A number of I/O primitives have gained the ability to time out their
5892 * A number of I/O primitives have gained the ability to close their
5893 reading/writing halves to cancel pending operations.
5894 * Reverse iterator methods have been removed in favor of `rev()` on
5895 their forward-iteration counterparts.
5896 * A bitflags! macro has been added to enable easy interop with C and
5897 management of bit flags.
5898 * A debug_assert! macro is now provided which is disabled when
5899 `--cfg ndebug` is passed to the compiler.
5900 * A graphviz crate has been added for creating .dot files.
5901 * The std::cast module has been migrated into std::mem.
5902 * The std::local_data api has been migrated from freestanding functions
5903 to being based on methods.
5904 * The Pod trait has been renamed to Copy.
5905 * jemalloc has been added as the default allocator for types.
5906 * The API for allocating memory has been changed to use proper alignment
5907 and sized deallocation
5908 * Connecting a TcpStream or binding a TcpListener is now based on a
5909 string address and a u16 port. This allows connecting to a hostname as
5911 * The Reader trait now contains a core method, read_at_least(), which
5912 correctly handles many repeated 0-length reads.
5913 * The process-spawning API is now centered around a builder-style
5915 * The :? printing qualifier has been moved from the standard library to
5916 an external libdebug crate.
5917 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5918 have been renamed to Eq/Ord.
5919 * The select/plural methods have been removed from format!. The escapes
5920 for { and } have also changed from \{ and \} to {{ and }},
5922 * The TaskBuilder API has been re-worked to be a true builder, and
5923 extension traits for spawning native/green tasks have been added.
5926 * All breaking changes to the language or libraries now have their
5927 commit message annotated with `[breaking-change]` to allow for easy
5928 discovery of breaking changes.
5929 * The compiler will now try to suggest how to annotate lifetimes if a
5930 lifetime-related error occurs.
5931 * Debug info continues to be improved greatly with general bug fixes and
5932 better support for situations like link time optimization (LTO).
5933 * Usage of syntax extensions when cross-compiling has been fixed.
5934 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5935 -fdata-sections and --gc-sections has been enabled by default
5936 * The compiler is now stricter about where it will load module files
5937 from when a module is declared via `mod foo;`.
5938 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5939 Syntax extensions are now discovered via a "plugin registrar" type
5940 which will be extended in the future to other various plugins.
5941 * Lints have been restructured to allow for dynamically loadable lints.
5942 * A number of rustdoc improvements:
5943 * The HTML output has been visually redesigned.
5944 * Markdown is now powered by hoedown instead of sundown.
5945 * Searching heuristics have been greatly improved.
5946 * The search index has been reduced in size by a great amount.
5947 * Cross-crate documentation via `pub use` has been greatly improved.
5948 * Primitive types are now hyperlinked and documented.
5949 * Documentation has been moved from static.rust-lang.org/doc to
5951 * A new sandbox, play.rust-lang.org, is available for running and
5952 sharing rust code examples on-line.
5953 * Unused attributes are now more robustly warned about.
5954 * The dead_code lint now warns about unused struct fields.
5955 * Cross-compiling to iOS is now supported.
5956 * Cross-compiling to mipsel is now supported.
5957 * Stability attributes are now inherited by default and no longer apply
5958 to intra-crate usage, only inter-crate usage.
5959 * Error message related to non-exhaustive match expressions have been
5963 Version 0.10 (2014-04-03)
5964 =========================
5966 * ~1500 changes, numerous bugfixes
5969 * A new RFC process is now in place for modifying the language.
5970 * Patterns with `@`-pointers have been removed from the language.
5971 * Patterns with unique vectors (`~[T]`) have been removed from the
5973 * Patterns with unique strings (`~str`) have been removed from the
5975 * `@str` has been removed from the language.
5976 * `@[T]` has been removed from the language.
5977 * `@self` has been removed from the language.
5978 * `@Trait` has been removed from the language.
5979 * Headers on `~` allocations which contain `@` boxes inside the type for
5980 reference counting have been removed.
5981 * The semantics around the lifetimes of temporary expressions have changed,
5982 see #3511 and #11585 for more information.
5983 * Cross-crate syntax extensions are now possible, but feature gated. See
5984 #11151 for more information. This includes both `macro_rules!` macros as
5985 well as syntax extensions such as `format!`.
5986 * New lint modes have been added, and older ones have been turned on to be
5988 * Unnecessary parentheses
5991 * Uppercase variables
5992 * Publicly visible private types
5993 * `#[deriving]` with raw pointers
5994 * Unsafe functions can no longer be coerced to closures.
5995 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5996 * The `#[simd]` attribute is now behind a feature gate.
5997 * Visibility is no longer allowed on `extern crate` statements, and
5998 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5999 * Trailing commas are now allowed in argument lists and tuple patterns.
6000 * The `do` keyword has been removed, it is now a reserved keyword.
6001 * Default type parameters have been implemented, but are feature gated.
6002 * Borrowed variables through captures in closures are now considered soundly.
6003 * `extern mod` is now `extern crate`
6004 * The `Freeze` trait has been removed.
6005 * The `Share` trait has been added for types that can be shared among
6007 * Labels in macros are now hygienic.
6008 * Expression/statement macro invocations can be delimited with `{}` now.
6009 * Treatment of types allowed in `static mut` locations has been tweaked.
6010 * The `*` and `.` operators are now overloadable through the `Deref` and
6012 * `~Trait` and `proc` no longer have `Send` bounds by default.
6013 * Partial type hints are now supported with the `_` type marker.
6014 * An `Unsafe` type was introduced for interior mutability. It is now
6015 considered undefined to transmute from `&T` to `&mut T` without using the
6017 * The #[linkage] attribute was implemented for extern statics/functions.
6018 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6019 * `Pod` was renamed to `Copy`.
6022 * The `libextra` library has been removed. It has now been decomposed into
6023 component libraries with smaller and more focused nuggets of
6024 functionality. The full list of libraries can be found on the
6025 documentation index page.
6026 * std: `std::condition` has been removed. All I/O errors are now propagated
6027 through the `Result` type. In order to assist with error handling, a
6028 `try!` macro for unwrapping errors with an early return and a lint for
6029 unused results has been added. See #12039 for more information.
6030 * std: The `vec` module has been renamed to `slice`.
6031 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6032 This will become the only growable vector in the future.
6033 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6034 are now found at `std::io::BufferedReader` instead of
6035 `std::io::buffered::BufferedReader`.
6036 * std: `print` and `println` are no longer in the prelude, the `print!` and
6037 `println!` macros are intended to be used instead.
6038 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6039 attempts to statically prevent cycles.
6040 * std: The standard distribution is adopting the policy of pushing failure
6041 to the user rather than failing in libraries. Many functions (such as
6042 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6043 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6044 deriving mode: `#[deriving(Show)]`.
6045 * std: `ToStr` is now implemented for all types implementing `Show`.
6046 * std: The formatting trait methods now take `&self` instead of `&T`
6047 * std: The `invert()` method on iterators has been renamed to `rev()`
6048 * std: `std::num` has seen a reduction in the genericity of its traits,
6049 consolidating functionality into a few core traits.
6050 * std: Backtraces are now printed on task failure if the environment
6051 variable `RUST_BACKTRACE` is present.
6052 * std: Naming conventions for iterators have been standardized. More details
6053 can be found on the wiki's style guide.
6054 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6055 still implement the function.
6056 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6057 * std: `assert_approx_eq!` has been removed
6058 * std: The `e` and `E` formatting specifiers for floats have been added to
6059 print them in exponential notation.
6060 * std: The `Times` trait has been removed
6061 * std: Indications of variance and opting out of builtin bounds is done
6062 through marker types in `std::kinds::marker` now
6063 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6064 `#[deriving(Hash)]` is now possible.
6065 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6066 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6067 * std: `Chan::new` is now `channel()`.
6068 * std: A new synchronous channel type has been implemented.
6069 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6070 * std: `hashmap` and `trie` have been moved to `libcollections`
6071 * std: `run` has been rolled into `io::process`
6072 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6073 * std: The equality and comparison traits have seen some reorganization.
6074 * std: `rand` has moved to `librand`.
6075 * std: `to_{lower,upper}case` has been implemented for `char`.
6076 * std: Logging has been moved to `liblog`.
6077 * collections: `HashMap` has been rewritten for higher performance and less
6079 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6080 it can be booted manually. The runtime guide has more information and
6082 * native: All I/O functionality except signals has been implemented.
6083 * green: Task spawning with `libgreen` has been optimized with stack caching
6084 and various trimming of code.
6085 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6086 * sync: The `extra::sync` module has been updated to modern rust (and moved
6087 to the `sync` library), tweaking and improving various interfaces while
6088 dropping redundant functionality.
6089 * sync: A new `Barrier` type has been added to the `sync` library.
6090 * sync: An efficient mutex for native and green tasks has been implemented.
6091 * serialize: The `base64` module has seen some improvement. It treats
6092 newlines better, has non-string error values, and has seen general
6094 * fourcc: A `fourcc!` macro was introduced
6095 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6096 hexadecimal literal.
6099 * `rustpkg` has been deprecated and removed from the main repository. Its
6100 replacement, `cargo`, is under development.
6101 * Nightly builds of rust are now available
6102 * The memory usage of rustc has been improved many times throughout this
6104 * The build process supports disabling rpath support for the rustc binary
6106 * Code generation has improved in some cases, giving more information to the
6107 LLVM optimization passes to enable more extensive optimizations.
6108 * Debuginfo compatibility with lldb on OSX has been restored.
6109 * The master branch is now gated on an android bot, making building for
6110 android much more reliable.
6111 * Output flags have been centralized into one `--emit` flag.
6112 * Crate type flags have been centralized into one `--crate-type` flag.
6113 * Codegen flags have been consolidated behind a `-C` flag.
6114 * Linking against outdated crates now has improved error messages.
6115 * Error messages with lifetimes will often suggest how to annotate the
6116 function to fix the error.
6117 * Many more types are documented in the standard library, and new guides
6119 * Many `rustdoc` improvements:
6120 * code blocks are syntax highlighted.
6121 * render standalone markdown files.
6122 * the --test flag tests all code blocks by default.
6123 * exported macros are displayed.
6124 * re-exported types have their documentation inlined at the location of the
6126 * search works across crates that have been rendered to the same output
6130 Version 0.9 (2014-01-09)
6131 ==========================
6133 * ~1800 changes, numerous bugfixes
6136 * The `float` type has been removed. Use `f32` or `f64` instead.
6137 * A new facility for enabling experimental features (feature gating) has
6138 been added, using the crate-level `#[feature(foo)]` attribute.
6139 * Managed boxes (@) are now behind a feature gate
6140 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6141 standard library's `Gc` or `Rc` types instead.
6142 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6143 * Jumping back to the top of a loop is now done with `continue` instead of
6145 * Strings can no longer be mutated through index assignment.
6146 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6147 hash delimiters, as in `r###"foo"###`.
6148 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6150 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6151 * `@fn`s have been removed.
6152 * `do` only works with procs in order to make it obvious what the cost
6154 * Single-element tuple-like structs can no longer be dereferenced to
6155 obtain the inner value. A more comprehensive solution for overloading
6156 the dereference operator will be provided in the future.
6157 * The `#[link(...)]` attribute has been replaced with
6158 `#[crate_id = "name#vers"]`.
6159 * Empty `impl`s must be terminated with empty braces and may not be
6160 terminated with a semicolon.
6161 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6162 no longer has any special meaning.
6163 * The old `fmt!` string formatting macro has been removed.
6164 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6165 `print!` and `println!`.
6166 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6167 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6168 `extern mod foo = "bar"` instead.
6169 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6170 * Macros can have attributes.
6171 * Macros can expand to items with attributes.
6172 * Macros can expand to multiple items.
6173 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6174 * Comments may be nested.
6175 * Values automatically coerce to trait objects they implement, without
6177 * Enum discriminants are no longer an entire word but as small as needed to
6178 contain all the variants. The `repr` attribute can be used to override
6179 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6180 `#[repr(C)]` to match C enums.
6181 * Non-string literals are not allowed in attributes (they never worked).
6182 * The FFI now supports variadic functions.
6183 * Octal numeric literals, as in `0o7777`.
6184 * The `concat!` syntax extension performs compile-time string concatenation.
6185 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6186 removed as Rust no longer uses segmented stacks.
6187 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6188 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6189 not `*`; ignoring remaining fields of a struct is also done with `..`,
6190 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6191 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6192 * `rustc` supports the "system" calling convention, which defaults to the
6193 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6195 * The `type_overflow` lint (default: warn) checks literals for overflow.
6196 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6197 * The `attribute_usage` lint (default: warn) warns about unknown
6199 * The `unknown_features` lint (default: warn) warns about unknown
6201 * The `dead_code` lint (default: warn) checks for dead code.
6202 * Rust libraries can be linked statically to one another
6203 * `#[link_args]` is behind the `link_args` feature gate.
6204 * Native libraries are now linked with `#[link(name = "foo")]`
6205 * Native libraries can be statically linked to a rust crate
6206 (`#[link(name = "foo", kind = "static")]`).
6207 * Native OS X frameworks are now officially supported
6208 (`#[link(name = "foo", kind = "framework")]`).
6209 * The `#[thread_local]` attribute creates thread-local (not task-local)
6210 variables. Currently behind the `thread_local` feature gate.
6211 * The `return` keyword may be used in closures.
6212 * Types that can be copied via a memcpy implement the `Pod` kind.
6213 * The `cfg` attribute can now be used on struct fields and enum variants.
6216 * std: The `option` and `result` API's have been overhauled to make them
6217 simpler, more consistent, and more composable.
6218 * std: The entire `std::io` module has been replaced with one that is
6219 more comprehensive and that properly interfaces with the underlying
6220 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6222 * std: `io::util` contains a number of useful implementations of
6223 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6224 `ZeroReader`, `TeeReader`.
6225 * std: The reference counted pointer type `extra::rc` moved into std.
6226 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6227 just a wrapper around it).
6228 * std: The `Either` type has been removed.
6229 * std: `fmt::Default` can be implemented for any type to provide default
6230 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6231 * std: The `rand` API continues to be tweaked.
6232 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6233 on failure in gdb, is now named `rust_fail`.
6234 * std: The `each_key` and `each_value` methods on `HashMap` have been
6235 replaced by the `keys` and `values` iterators.
6236 * std: Functions dealing with type size and alignment have moved from the
6237 `sys` module to the `mem` module.
6238 * std: The `path` module was written and API changed.
6239 * std: `str::from_utf8` has been changed to cast instead of allocate.
6240 * std: `starts_with` and `ends_with` methods added to vectors via the
6241 `ImmutableEqVector` trait, which is in the prelude.
6242 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6243 if the index is out of bounds.
6244 * std: Task failure no longer propagates between tasks, as the model was
6245 complex, expensive, and incompatible with thread-based tasks.
6246 * std: The `Any` type can be used for dynamic typing.
6247 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6249 * std: Methods that produce iterators generally do not have an `_iter`
6251 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6252 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6253 * std: `util::ignore` renamed to `prelude::drop`.
6254 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6256 * std: `vec::raw` has seen a lot of cleanup and API changes.
6257 * std: The standard library no longer includes any C++ code, and very
6258 minimal C, eliminating the dependency on libstdc++.
6259 * std: Runtime scheduling and I/O functionality has been factored out into
6260 extensible interfaces and is now implemented by two different crates:
6261 libnative, for native threading and I/O; and libgreen, for green threading
6262 and I/O. This paves the way for using the standard library in more limited
6263 embedded environments.
6264 * std: The `comm` module has been rewritten to be much faster, have a
6265 simpler, more consistent API, and to work for both native and green
6267 * std: All libuv dependencies have been moved into the rustuv crate.
6268 * native: New implementations of runtime scheduling on top of OS threads.
6269 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6271 * green: The green thread scheduler and message passing types are almost
6273 * extra: The `flatpipes` module had bitrotted and was removed.
6274 * extra: All crypto functions have been removed and Rust now has a policy of
6275 not reimplementing crypto in the standard library. In the future crypto
6276 will be provided by external crates with bindings to established libraries.
6277 * extra: `c_vec` has been modernized.
6278 * extra: The `sort` module has been removed. Use the `sort` method on
6282 * The `rust` and `rusti` commands have been removed, due to lack of
6284 * `rustdoc` was completely rewritten.
6285 * `rustdoc` can test code examples in documentation.
6286 * `rustpkg` can test packages with the argument, 'test'.
6287 * `rustpkg` supports arbitrary dependencies, including C libraries.
6288 * `rustc`'s support for generating debug info is improved again.
6289 * `rustc` has better error reporting for unbalanced delimiters.
6290 * `rustc`'s JIT support was removed due to bitrot.
6291 * Executables and static libraries can be built with LTO (-Z lto)
6292 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6296 Version 0.8 (2013-09-26)
6297 ============================
6299 * ~2200 changes, numerous bugfixes
6302 * The `for` loop syntax has changed to work with the `Iterator` trait.
6303 * At long last, unwinding works on Windows.
6304 * Default methods are ready for use.
6305 * Many trait inheritance bugs fixed.
6306 * Owned and borrowed trait objects work more reliably.
6307 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6308 * rustc can omit emission of code for the `debug!` macro if it is passed
6310 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6311 for foo.rs, then foo/mod.rs, and will generate an error when both are
6313 * Strings no longer contain trailing nulls. The new `std::c_str` module
6314 provides new mechanisms for converting to C strings.
6315 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6316 * The FFI has been overhauled such that foreign functions are called directly,
6317 instead of through a stack-switching wrapper.
6318 * Calling a foreign function must be done through a Rust function with the
6319 `#[fixed_stack_segment]` attribute.
6320 * The `externfn!` macro can be used to declare both a foreign function and
6321 a `#[fixed_stack_segment]` wrapper at once.
6322 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6323 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6324 * `priv` is disallowed everywhere except for struct fields and enum variants.
6325 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6326 * `ref` bindings in irrefutable patterns work correctly now.
6327 * `char` is now prevented from containing invalid code points.
6328 * Casting to `bool` is no longer allowed.
6329 * `\0` is now accepted as an escape in chars and strings.
6330 * `yield` is a reserved keyword.
6331 * `typeof` is a reserved keyword.
6332 * Crates may be imported by URL with `extern mod foo = "url";`.
6333 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6334 * Static vectors can be initialized with repeating elements,
6335 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6336 * Static structs can be initialized with functional record update,
6337 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6338 * `cfg!` can be used to conditionally execute code based on the crate
6339 configuration, similarly to `#[cfg(...)]`.
6340 * The `unnecessary_qualification` lint detects unneeded module
6341 prefixes (default: allow).
6342 * Arithmetic operations have been implemented on the SIMD types in
6343 `std::unstable::simd`.
6344 * Exchange allocation headers were removed, reducing memory usage.
6345 * `format!` implements a completely new, extensible, and higher-performance
6346 string formatting system. It will replace `fmt!`.
6347 * `print!` and `println!` write formatted strings (using the `format!`
6348 extension) to stdout.
6349 * `write!` and `writeln!` write formatted strings (using the `format!`
6350 extension) to the new Writers in `std::rt::io`.
6351 * The library section in which a function or static is placed may
6352 be specified with `#[link_section = "..."]`.
6353 * The `proto!` syntax extension for defining bounded message protocols
6355 * `macro_rules!` is hygienic for `let` declarations.
6356 * The `#[export_name]` attribute specifies the name of a symbol.
6357 * `unreachable!` can be used to indicate unreachable code, and fails
6361 * std: Transitioned to the new runtime, written in Rust.
6362 * std: Added an experimental I/O library, `rt::io`, based on the new
6364 * std: A new generic `range` function was added to the prelude, replacing
6365 `uint::range` and friends.
6366 * std: `range_rev` no longer exists. Since range is an iterator it can be
6367 reversed with `range(lo, hi).invert()`.
6368 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6369 renamed to `unwrap_or`.
6370 * std: The `iterator` module was renamed to `iter`.
6371 * std: Integral types now support the `checked_add`, `checked_sub`, and
6372 `checked_mul` operations for detecting overflow.
6373 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6375 * std: Methods are standardizing on conventions for casting methods:
6376 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6378 * std: The `CString` type in `c_str` provides new ways to convert to and
6380 * std: `DoubleEndedIterator` can yield elements in two directions.
6381 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6383 * std: `str::from_bytes` renamed to `str::from_utf8`.
6384 * std: `pop_opt` and `shift_opt` methods added to vectors.
6385 * std: The task-local data interface no longer uses @, and keys are
6386 no longer function pointers.
6387 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6388 * std: Added `SharedPort` to `comm`.
6389 * std: `Eq` has a default method for `ne`; only `eq` is required
6391 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6392 is required in implementations.
6393 * std: `is_utf8` performance is improved, impacting many string functions.
6394 * std: `os::MemoryMap` provides cross-platform mmap.
6395 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6396 are not 'in-bounds' are considered undefined.
6397 * std: Many freestanding functions in `vec` removed in favor of methods.
6398 * std: Many freestanding functions on scalar types removed in favor of
6400 * std: Many options to task builders were removed since they don't make
6401 sense in the new scheduler design.
6402 * std: More containers implement `FromIterator` so can be created by the
6404 * std: More complete atomic types in `unstable::atomics`.
6405 * std: `comm::PortSet` removed.
6406 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6407 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6408 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6409 default implementations.
6410 * std: Various `from_str` functions were removed in favor of a generic
6411 `from_str` which is available in the prelude.
6412 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6413 * extra: `dlist`, the doubly-linked list was modernized.
6414 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6415 * extra: Added `glob` module, replacing `std::os::glob`.
6416 * extra: `rope` was removed.
6417 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6418 * extra: `net`, and `timer` were removed. The experimental replacements
6419 are `std::rt::io::net` and `std::rt::io::timer`.
6420 * extra: Iterators implemented for `SmallIntMap`.
6421 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6422 * extra: `SmallIntSet` removed. Use `BitvSet`.
6423 * extra: Performance of JSON parsing greatly improved.
6424 * extra: `semver` updated to SemVer 2.0.0.
6425 * extra: `term` handles more terminals correctly.
6426 * extra: `dbg` module removed.
6427 * extra: `par` module removed.
6428 * extra: `future` was cleaned up, with some method renames.
6429 * extra: Most free functions in `getopts` were converted to methods.
6432 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6433 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6434 similarly to gcc's `--march` flag.
6435 * rustc's performance compiling small crates is much better.
6436 * rustpkg has received many improvements.
6437 * rustpkg supports git tags as package IDs.
6438 * rustpkg builds into target-specific directories so it can be used for
6440 * The number of concurrent test tasks is controlled by the environment
6441 variable RUST_TEST_TASKS.
6442 * The test harness can now report metrics for benchmarks.
6443 * All tools have man pages.
6444 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6445 * The runtime uses jemalloc for allocations.
6446 * Segmented stacks are temporarily disabled as part of the transition to
6447 the new runtime. Stack overflows are possible!
6448 * A new documentation backend, rustdoc_ng, is available for use. It is
6449 still invoked through the normal `rustdoc` command.
6452 Version 0.7 (2013-07-03)
6453 =======================
6455 * ~2000 changes, numerous bugfixes
6458 * `impl`s no longer accept a visibility qualifier. Put them on methods
6460 * The borrow checker has been rewritten with flow-sensitivity, fixing
6461 many bugs and inconveniences.
6462 * The `self` parameter no longer implicitly means `&'self self`,
6463 and can be explicitly marked with a lifetime.
6464 * Overloadable compound operators (`+=`, etc.) have been temporarily
6465 removed due to bugs.
6466 * The `for` loop protocol now requires `for`-iterators to return `bool`
6467 so they compose better.
6468 * The `Durable` trait is replaced with the `'static` bounds.
6469 * Trait default methods work more often.
6470 * Structs with the `#[packed]` attribute have byte alignment and
6471 no padding between fields.
6472 * Type parameters bound by `Copy` must now be copied explicitly with
6474 * It is now illegal to move out of a dereferenced unsafe pointer.
6475 * `Option<~T>` is now represented as a nullable pointer.
6476 * `@mut` does dynamic borrow checks correctly.
6477 * The `main` function is only detected at the topmost level of the crate.
6478 The `#[main]` attribute is still valid anywhere.
6479 * Struct fields may no longer be mutable. Use inherited mutability.
6480 * The `#[no_send]` attribute makes a type that would otherwise be
6482 * The `#[no_freeze]` attribute makes a type that would otherwise be
6484 * Unbounded recursion will abort the process after reaching the limit
6485 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6486 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6487 are never implicitly copyable.
6488 * `#[static_assert]` makes compile-time assertions about static bools.
6489 * At long last, 'argument modes' no longer exist.
6490 * The rarely used `use mod` statement no longer exists.
6493 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6495 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6496 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6498 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6499 and unsuffixed integer literals.
6502 * The `core` crate was renamed to `std`.
6503 * The `std` crate was renamed to `extra`.
6504 * More and improved documentation.
6505 * std: `iterator` module for external iterator objects.
6506 * Many old-style (internal, higher-order function) iterators replaced by
6507 implementations of `Iterator`.
6508 * std: Many old internal vector and string iterators,
6509 incl. `any`, `all`. removed.
6510 * std: The `finalize` method of `Drop` renamed to `drop`.
6511 * std: The `drop` method now takes `&mut self` instead of `&self`.
6512 * std: The prelude no longer re-exports any modules, only types and traits.
6513 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6514 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6515 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6516 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6517 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6518 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6519 * std: Many types implement `Clone`.
6520 * std: `path` type renamed to `Path`.
6521 * std: `mut` module and `Mut` type removed.
6522 * std: Many standalone functions removed in favor of methods and iterators
6523 in `vec`, `str`. In the future methods will also work as functions.
6524 * std: `reinterpret_cast` removed. Use `transmute`.
6525 * std: ascii string handling in `std::ascii`.
6526 * std: `Rand` is implemented for ~/@.
6527 * std: `run` module for spawning processes overhauled.
6528 * std: Various atomic types added to `unstable::atomic`.
6529 * std: Various types implement `Zero`.
6530 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6531 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6532 * std: Added `os::mkdir_recursive`.
6533 * std: Added `os::glob` function performs filesystems globs.
6534 * std: `FuzzyEq` renamed to `ApproxEq`.
6535 * std: `Map` now defines `pop` and `swap` methods.
6536 * std: `Cell` constructors converted to static methods.
6537 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6538 * extra: `flate` module moved from `std` to `extra`.
6539 * extra: `fileinput` module for iterating over a series of files.
6540 * extra: `Complex` number type and `complex` module.
6541 * extra: `Rational` number type and `rational` module.
6542 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6543 * extra: `term` uses terminfo now, is more correct.
6544 * extra: `arc` functions converted to methods.
6545 * extra: Implementation of fixed output size variations of SHA-2.
6548 * `unused_variable` lint mode for unused variables (default: warn).
6549 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6551 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6553 * `dead_assignment` lint mode for unread variables (default: warn).
6554 * `unnecessary_allocation` lint mode detects some heap allocations that are
6555 immediately borrowed so could be written without allocating (default: warn).
6556 * `missing_doc` lint mode (default: allow).
6557 * `unreachable_code` lint mode (default: warn).
6558 * The `rusti` command has been rewritten and a number of bugs addressed.
6559 * rustc outputs in color on more terminals.
6560 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6561 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6562 * Compiling with `-g` will make the binary record information about
6563 dynamic borrowcheck failures for debugging.
6564 * rustdoc has a nicer stylesheet.
6565 * Various improvements to rustdoc.
6566 * Improvements to rustpkg (see the detailed release notes).
6569 Version 0.6 (2013-04-03)
6570 ========================
6572 * ~2100 changes, numerous bugfixes
6575 * The self type parameter in traits is now spelled `Self`
6576 * The `self` parameter in trait and impl methods must now be explicitly
6577 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6578 * Static methods no longer require the `static` keyword and instead
6579 are distinguished by the lack of a `self` parameter
6580 * Replaced the `Durable` trait with the `'static` lifetime
6581 * The old closure type syntax with the trailing sigil has been
6582 removed in favor of the more consistent leading sigil
6583 * `super` is a keyword, and may be prefixed to paths
6584 * Trait bounds are separated with `+` instead of whitespace
6585 * Traits are implemented with `impl Trait for Type`
6586 instead of `impl Type: Trait`
6587 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6588 * The `export` keyword has finally been removed
6589 * The `move` keyword has been removed (see "Semantic changes")
6590 * The interior mutability qualifier on vectors, `[mut T]`, has been
6591 removed. Use `&mut [T]`, etc.
6592 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6593 * `fail` is no longer a keyword. Use `fail!()`
6594 * `assert` is no longer a keyword. Use `assert!()`
6595 * `log` is no longer a keyword. use `debug!`, etc.
6596 * 1-tuples may be represented as `(T,)`
6597 * Struct fields may no longer be `mut`. Use inherited mutability,
6598 `@mut T`, `core::mut` or `core::cell`
6599 * `extern mod { ... }` is no longer valid syntax for foreign
6600 function modules. Use extern blocks: `extern { ... }`
6601 * Newtype enums removed. Use tuple-structs.
6602 * Trait implementations no longer support visibility modifiers
6603 * Pattern matching over vectors improved and expanded
6604 * `const` renamed to `static` to correspond to lifetime name,
6605 and make room for future `static mut` unsafe mutable globals.
6606 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6607 * `Clone` implementations can be automatically generated with
6608 `#[deriving(Clone)]`
6609 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6610 instead of `foo as Bar`.
6611 * Fixed length vector types are now written as `[int, .. 3]`
6612 instead of `[int * 3]`.
6613 * Fixed length vector types can express the length as a constant
6614 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6617 * Types with owned pointers or custom destructors move by default,
6618 eliminating the `move` keyword
6619 * All foreign functions are considered unsafe
6620 * &mut is now unaliasable
6621 * Writes to borrowed @mut pointers are prevented dynamically
6623 * The name of the main function can be customized using #[main]
6624 * The default type of an inferred closure is &fn instead of @fn
6625 * `use` statements may no longer be "chained" - they cannot import
6626 identifiers imported by previous `use` statements
6627 * `use` statements are crate relative, importing from the "top"
6628 of the crate by default. Paths may be prefixed with `super::`
6629 or `self::` to change the search behavior.
6630 * Method visibility is inherited from the implementation declaration
6631 * Structural records have been removed
6632 * Many more types can be used in static items, including enums
6633 'static-lifetime pointers and vectors
6634 * Pattern matching over vectors improved and expanded
6635 * Typechecking of closure types has been overhauled to
6636 improve inference and eliminate unsoundness
6637 * Macros leave scope at the end of modules, unless that module is
6638 tagged with #[macro_escape]
6641 * Added big integers to `std::bigint`
6642 * Removed `core::oldcomm` module
6643 * Added pipe-based `core::comm` module
6644 * Numeric traits have been reorganized under `core::num`
6645 * `vec::slice` finally returns a slice
6646 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6647 * Containers reorganized around traits in `core::container`
6648 * `core::dvec` removed, `~[T]` is a drop-in replacement
6649 * `core::send_map` renamed to `core::hashmap`
6650 * `std::map` removed; replaced with `core::hashmap`
6651 * `std::treemap` reimplemented as an owned balanced tree
6652 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6653 * `core::trie` added as a fast ordered map for integer keys
6654 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6655 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6656 overload the comparison operators, whereas `TotalOrd` is used
6657 by certain container types
6660 * Replaced the 'cargo' package manager with 'rustpkg'
6661 * Added all-purpose 'rust' tool
6662 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6663 * rustc now *attempts* to offer spelling suggestions
6664 * Improved support for ARM and Android
6665 * Preliminary MIPS backend
6666 * Improved foreign function ABI implementation for x86, x86_64
6667 * Various memory usage improvements
6668 * Rust code may be embedded in foreign code under limited circumstances
6669 * Inline assembler supported by new asm!() syntax extension.
6672 Version 0.5 (2012-12-21)
6673 ===========================
6675 * ~900 changes, numerous bugfixes
6678 * Removed `<-` move operator
6679 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6680 * Removed old fixed length vector syntax - `[T]/N`
6681 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6682 * Macros may now expand to items and statements
6683 * `a.b()` is always parsed as a method call, never as a field projection
6684 * `Eq` and `IterBytes` implementations can be automatically generated
6685 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6686 * Removed the special crate language for `.rc` files
6687 * Function arguments may consist of any irrefutable pattern
6690 * `&` and `~` pointers may point to objects
6691 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6692 * Enum variants may be structs
6693 * Destructors can be added to all nominal types with the Drop trait
6694 * Structs and nullary enum variants may be constants
6695 * Values that cannot be implicitly copied are now automatically moved
6696 without writing `move` explicitly
6697 * `&T` may now be coerced to `*T`
6698 * Coercions happen in `let` statements as well as function calls
6699 * `use` statements now take crate-relative paths
6700 * The module and type namespaces have been merged so that static
6701 method names can be resolved under the trait in which they are
6704 * Improved support for language features
6705 * Trait inheritance works in many scenarios
6706 * More support for explicit self arguments in methods - `self`, `&self`
6707 `@self`, and `~self` all generally work as expected
6708 * Static methods work in more situations
6709 * Experimental: Traits may declare default methods for the implementations
6713 * New condition handling system in `core::condition`
6714 * Timsort added to `std::sort`
6715 * New priority queue, `std::priority_queue`
6716 * Pipes for serializable types, `std::flatpipes'
6717 * Serialization overhauled to be trait-based
6718 * Expanded `getopts` definitions
6719 * Moved futures to `std`
6720 * More functions are pure now
6721 * `core::comm` renamed to `oldcomm`. Still deprecated
6722 * `rustdoc` and `cargo` are libraries now
6725 * Added a preliminary REPL, `rusti`
6726 * License changed from MIT to dual MIT/APL2
6729 Version 0.4 (2012-10-15)
6730 ==========================
6732 * ~2000 changes, numerous bugfixes
6735 * All keywords are now strict and may not be used as identifiers anywhere
6736 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6737 'of', 'with', 'to', 'class'.
6738 * Classes are replaced with simpler structs
6739 * Explicit method self types
6740 * `ret` became `return` and `alt` became `match`
6741 * `import` is now `use`; `use is now `extern mod`
6742 * `extern mod { ... }` is now `extern { ... }`
6743 * `use mod` is the recommended way to import modules
6744 * `pub` and `priv` replace deprecated export lists
6745 * The syntax of `match` pattern arms now uses fat arrow (=>)
6746 * `main` no longer accepts an args vector; use `os::args` instead
6749 * Trait implementations are now coherent, ala Haskell typeclasses
6750 * Trait methods may be static
6751 * Argument modes are deprecated
6752 * Borrowed pointers are much more mature and recommended for use
6753 * Strings and vectors in the static region are stored in constant memory
6754 * Typestate was removed
6755 * Resolution rewritten to be more reliable
6756 * Support for 'dual-mode' data structures (freezing and thawing)
6759 * Most binary operators can now be overloaded via the traits in
6761 * `std::net::url` for representing URLs
6762 * Sendable hash maps in `core::send_map`
6763 * `core::task' gained a (currently unsafe) task-local storage API
6766 * An efficient new intertask communication primitive called the pipe,
6767 along with a number of higher-level channel types, in `core::pipes`
6768 * `std::arc`, an atomically reference counted, immutable, shared memory
6770 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6771 * Futures are now based on pipes and sendable
6772 * More robust linked task failure
6773 * Improved task builder API
6776 * Improved error reporting
6777 * Preliminary JIT support
6778 * Preliminary work on precise GC
6779 * Extensive architectural improvements to rustc
6780 * Begun a transition away from buggy C++-based reflection (shape) code to
6781 Rust-based (visitor) code
6782 * All hash functions and tables converted to secure, randomized SipHash
6785 Version 0.3 (2012-07-12)
6786 ========================
6788 * ~1900 changes, numerous bugfixes
6790 * New coding conveniences
6791 * Integer-literal suffix inference
6792 * Per-item control over warnings, errors
6793 * #[cfg(windows)] and #[cfg(unix)] attributes
6794 * Documentation comments
6795 * More compact closure syntax
6796 * 'do' expressions for treating higher-order functions as
6798 * *-patterns (wildcard extended to all constructor fields)
6801 * Name resolution pass and exhaustiveness checker rewritten
6802 * Region pointers and borrow checking supersede alias
6804 * Init-ness checking is now provided by a region-based liveness
6805 pass instead of the typestate pass; same for last-use analysis
6806 * Extensive work on region pointers
6808 * Experimental new language features
6809 * Slices and fixed-size, interior-allocated vectors
6810 * #!-comments for lang versioning, shell execution
6811 * Destructors and iface implementation for classes;
6812 type-parameterized classes and class methods
6813 * 'const' type kind for types that can be used to implement
6814 shared-memory concurrency patterns
6818 * Removal of various obsolete features
6819 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6820 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6822 * Constructs: do-while loops ('do' repurposed), fn binding,
6823 resources (replaced by destructors)
6825 * Compiler reorganization
6826 * Syntax-layer of compiler split into separate crate
6827 * Clang (from LLVM project) integrated into build
6828 * Typechecker split into sub-modules
6831 * New time functions
6832 * Extension methods for many built-in types
6833 * Arc: atomic-refcount read-only / exclusive-use shared cells
6834 * Par: parallel map and search routines
6835 * Extensive work on libuv interface
6836 * Much vector code moved to libraries
6837 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6838 #include, #include_str, #include_bin
6841 * Cargo automatically resolves dependencies
6844 Version 0.2 (2012-03-29)
6845 =========================
6847 * >1500 changes, numerous bugfixes
6849 * New docs and doc tooling
6851 * New port: FreeBSD x86_64
6853 * Compilation model enhancements
6854 * Generics now specialized, multiply instantiated
6855 * Functions now inlined across separate crates
6857 * Scheduling, stack and threading fixes
6858 * Noticeably improved message-passing performance
6859 * Explicit schedulers
6863 * Experimental new language features
6864 * Operator overloading
6868 * Various language extensions
6869 * C-callback function types: 'crust fn ...'
6870 * Infinite-loop construct: 'loop { ... }'
6871 * Shorten 'mutable' to 'mut'
6872 * Required mutable-local qualifier: 'let mut ...'
6873 * Basic glob-exporting: 'export foo::*;'
6874 * Alt now exhaustive, 'alt check' for runtime-checked
6875 * Block-function form of 'for' loop, with 'break' and 'ret'.
6878 * AST quasi-quote syntax extension
6879 * Revived libuv interface
6880 * New modules: core::{future, iter}, std::arena
6881 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6882 * Extensive cleanup, regularization in libstd, libcore
6885 Version 0.1 (2012-01-20)
6886 ===============================
6888 * Most language features work, including:
6889 * Unique pointers, unique closures, move semantics
6890 * Interface-constrained generics
6891 * Static interface dispatch
6893 * Multithread task scheduling
6894 * Typestate predicates
6895 * Failure unwinding, destructors
6896 * Pattern matching and destructuring assignment
6897 * Lightweight block-lambda syntax
6898 * Preliminary macro-by-example
6900 * Compiler works with the following configurations:
6901 * Linux: x86 and x86_64 hosts and targets
6902 * macOS: x86 and x86_64 hosts and targets
6903 * Windows: x86 hosts and targets
6905 * Cross compilation / multi-target configuration supported.
6907 * Preliminary API-documentation and package-management tools included.
6911 * Documentation is incomplete.
6913 * Performance is below intended target.
6915 * Standard library APIs are subject to extensive change, reorganization.
6917 * Language-level versioning is not yet operational - future code will