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 the 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#for = 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 no longer requires being prefixed with `::`.][54404]
16 Previously, using a external crate in a module without a use statement
17 required `let json = ::serde_json::from_str(foo);` but 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 users won't have to import
28 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
29 using the `vis` specifier.][53370]
30 - [Non-macro attributes now allow all forms of literals, not just
31 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
32 write `#[attr(true)]`.
33 - [You can now specify a function to handle a panic in the Rust runtime with the
34 `#[panic_handler]` attribute.][51366]
38 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
39 - [Added the `aarch64-unknown-netbsd` target][53165]
43 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
47 - [`Ipv4Addr::BROADCAST`]
48 - [`Ipv4Addr::LOCALHOST`]
49 - [`Ipv4Addr::UNSPECIFIED`]
50 - [`Ipv6Addr::LOCALHOST`]
51 - [`Ipv6Addr::UNSPECIFIED`]
52 - [`Iterator::find_map`]
54 The following methods are replacement methods for `trim_left`, `trim_right`,
55 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
57 - [`str::trim_end_matches`]
59 - [`str::trim_start_matches`]
64 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
65 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
66 equivalent to calling `rustdoc --error-format=json`.
67 - [You can specify which edition to create a project in cargo
68 with `cargo new --edition`.][cargo/5984] Currently only `2015` is a
70 - [Cargo will now provide a progress bar for builds.][cargo/5995]
74 - [`rustdoc` allows you to specify what edition to treat your code as with the
75 `--edition` option.][54057]
76 - [`rustdoc` now has the `--color` (specify whether to output color) and
77 `--error-format` (specify error format, e.g. `json`) options.][53003]
78 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
79 debug symbols.][53774]
80 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
81 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
83 [50911]: https://github.com/rust-lang/rust/pull/50911/
84 [51363]: https://github.com/rust-lang/rust/pull/51363/
85 [51366]: https://github.com/rust-lang/rust/pull/51366/
86 [52081]: https://github.com/rust-lang/rust/pull/52081/
87 [53003]: https://github.com/rust-lang/rust/pull/53003/
88 [53033]: https://github.com/rust-lang/rust/pull/53033/
89 [53044]: https://github.com/rust-lang/rust/pull/53044/
90 [53165]: https://github.com/rust-lang/rust/pull/53165/
91 [53213]: https://github.com/rust-lang/rust/pull/53213/
92 [53236]: https://github.com/rust-lang/rust/pull/53236/
93 [53272]: https://github.com/rust-lang/rust/pull/53272/
94 [53370]: https://github.com/rust-lang/rust/pull/53370/
95 [53459]: https://github.com/rust-lang/rust/pull/53459/
96 [53774]: https://github.com/rust-lang/rust/pull/53774/
97 [53822]: https://github.com/rust-lang/rust/pull/53822/
98 [54057]: https://github.com/rust-lang/rust/pull/54057/
99 [54146]: https://github.com/rust-lang/rust/pull/54146/
100 [54404]: https://github.com/rust-lang/rust/pull/54404/
101 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
102 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
103 [cargo/5984]: https://github.com/rust-lang/cargo/pull/5984/
104 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
105 [proc-macros]: https://doc.rust-lang.org/book/2018-edition/ch19-06-macros.html
107 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
108 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
109 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
110 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
111 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
112 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
113 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
114 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
115 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
116 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
119 Version 1.29.2 (2018-10-11)
120 ===========================
122 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
123 - The `rls-preview` component on the windows-gnu targets has been restored.
125 [54639]: https://github.com/rust-lang/rust/pull/54639
128 Version 1.29.1 (2018-09-25)
129 ===========================
134 - The standard library's `str::repeat` function contained an out of bounds write
135 caused by an integer overflow. This has been fixed by deterministically
136 panicking when an overflow happens.
138 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
142 Version 1.29.0 (2018-09-13)
143 ==========================
147 - [Bumped minimum LLVM version to 5.0.][51899]
148 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
149 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
153 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
154 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
155 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
156 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
158 - [`Cell<T>` now allows `T` to be unsized.][50494]
159 - [`SocketAddr` is now stable on Redox.][52656]
164 - [`Iterator::flatten`]
169 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
170 `--locked` to disable this behavior.
171 - [`cargo-install` will now allow you to cross compile an install
172 using `--target`.][cargo/5614]
173 - [Added the `cargo-fix` subcommand to automatically move project code from
174 2015 edition to 2018.][cargo/5723]
175 - [`cargo doc` can now optionally document private types using the
176 `--document-private-items` flag.][cargo/5543]
180 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
181 the specified level to that level.][52354] For example `--cap-lints warn`
182 will demote `deny` and `forbid` lints to `warn`.
183 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
184 fails and `101` if there is a panic.][52197]
185 - [A preview of clippy has been made available through rustup.][51122]
186 You can install the preview with `rustup component add clippy-preview`.
190 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
191 Use `str::get_unchecked(begin..end)` instead.
192 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
193 Consider using the `home_dir` function from
194 https://crates.io/crates/dirs instead.
195 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
196 - [`cfg` attributes and `--cfg` command line flags are now more
197 strictly validated.][53893]
199 [53893]: https://github.com/rust-lang/rust/pull/53893/
200 [52861]: https://github.com/rust-lang/rust/pull/52861/
201 [52656]: https://github.com/rust-lang/rust/pull/52656/
202 [52239]: https://github.com/rust-lang/rust/pull/52239/
203 [52330]: https://github.com/rust-lang/rust/pull/52330/
204 [52354]: https://github.com/rust-lang/rust/pull/52354/
205 [52402]: https://github.com/rust-lang/rust/pull/52402/
206 [52103]: https://github.com/rust-lang/rust/pull/52103/
207 [52197]: https://github.com/rust-lang/rust/pull/52197/
208 [51807]: https://github.com/rust-lang/rust/pull/51807/
209 [51899]: https://github.com/rust-lang/rust/pull/51899/
210 [51912]: https://github.com/rust-lang/rust/pull/51912/
211 [51511]: https://github.com/rust-lang/rust/pull/51511/
212 [51619]: https://github.com/rust-lang/rust/pull/51619/
213 [51656]: https://github.com/rust-lang/rust/pull/51656/
214 [51178]: https://github.com/rust-lang/rust/pull/51178/
215 [51122]: https://github.com/rust-lang/rust/pull/51122
216 [50494]: https://github.com/rust-lang/rust/pull/50494/
217 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
218 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
219 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
220 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
221 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
222 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
223 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
226 Version 1.28.0 (2018-08-02)
227 ===========================
231 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
232 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
233 the inner type across Foreign Function Interface (FFI) boundaries.
234 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
235 and can now be used as identifiers.][51196]
236 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
237 stable.][51241] This will allow users to specify a global allocator for
239 - [Unit test functions marked with the `#[test]` attribute can now return
240 `Result<(), E: Debug>` in addition to `()`.][51298]
241 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
242 allows macros to easily target lifetimes.
246 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
247 prioritise making smaller binary sizes. `z` is the same as `s` with the
248 exception that it does not vectorise loops, which typically results in an even
250 - [The short error format is now stable.][49546] Specified with
251 `--error-format=short` this option will provide a more compressed output of
253 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
254 - [Reduced the number of allocations in the macro parser.][50855] This can
255 improve compile times of macro heavy crates on average by 5%.
259 - [Implemented `Default` for `&mut str`.][51306]
260 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
261 - [Implemented `Extend` for `()`.][50234]
262 - [The `Debug` implementation of `time::Duration` should now be more easily
263 human readable.][50364] Previously a `Duration` of one second would printed as
264 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
265 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
266 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
267 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
268 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
269 for `PathBuf`.][50170]
270 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
271 and `Wrapping<i128>`.][50465]
272 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
273 possible.][51050] This can provide up to a 40% speed increase.
274 - [Improved error messages when using `format!`.][50610]
278 - [`Iterator::step_by`]
279 - [`Path::ancestors`]
280 - [`SystemTime::UNIX_EPOCH`]
281 - [`alloc::GlobalAlloc`]
283 - [`alloc::LayoutErr`]
286 - [`alloc::alloc_zeroed`]
289 - [`alloc::handle_alloc_error`]
290 - [`btree_map::Entry::or_default`]
292 - [`hash_map::Entry::or_default`]
293 - [`iter::repeat_with`]
294 - [`num::NonZeroUsize`]
295 - [`num::NonZeroU128`]
296 - [`num::NonZeroU16`]
297 - [`num::NonZeroU32`]
298 - [`num::NonZeroU64`]
300 - [`ops::RangeBounds`]
301 - [`slice::SliceIndex`]
302 - [`slice::from_mut`]
303 - [`slice::from_ref`]
304 - [`{Any + Send + Sync}::downcast_mut`]
305 - [`{Any + Send + Sync}::downcast_ref`]
306 - [`{Any + Send + Sync}::is`]
310 - [Cargo will now no longer allow you to publish crates with build scripts that
311 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
312 considered to be immutable.
316 - [The `suggestion_applicability` field in `rustc`'s json output is now
317 stable.][50486] This will allow dev tools to check whether a code suggestion
322 - [Rust will consider trait objects with duplicated constraints to be the same
323 type as without the duplicated constraint.][51276] For example the below code will
329 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
332 impl Trait + Send + Send {
333 fn test(&self) { println!("two"); }
337 [49546]: https://github.com/rust-lang/rust/pull/49546/
338 [50143]: https://github.com/rust-lang/rust/pull/50143/
339 [50170]: https://github.com/rust-lang/rust/pull/50170/
340 [50234]: https://github.com/rust-lang/rust/pull/50234/
341 [50265]: https://github.com/rust-lang/rust/pull/50265/
342 [50364]: https://github.com/rust-lang/rust/pull/50364/
343 [50385]: https://github.com/rust-lang/rust/pull/50385/
344 [50465]: https://github.com/rust-lang/rust/pull/50465/
345 [50486]: https://github.com/rust-lang/rust/pull/50486/
346 [50554]: https://github.com/rust-lang/rust/pull/50554/
347 [50610]: https://github.com/rust-lang/rust/pull/50610/
348 [50855]: https://github.com/rust-lang/rust/pull/50855/
349 [51050]: https://github.com/rust-lang/rust/pull/51050/
350 [51196]: https://github.com/rust-lang/rust/pull/51196/
351 [51200]: https://github.com/rust-lang/rust/pull/51200/
352 [51241]: https://github.com/rust-lang/rust/pull/51241/
353 [51276]: https://github.com/rust-lang/rust/pull/51276/
354 [51298]: https://github.com/rust-lang/rust/pull/51298/
355 [51306]: https://github.com/rust-lang/rust/pull/51306/
356 [51562]: https://github.com/rust-lang/rust/pull/51562/
357 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
358 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
359 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
360 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
361 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
362 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
363 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
364 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
365 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
366 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
367 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
368 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
369 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
370 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
371 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
372 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
373 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
374 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
375 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
376 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
377 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
378 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
379 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
380 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
381 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
382 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
383 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
384 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
385 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
386 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
388 Version 1.27.2 (2018-07-20)
389 ===========================
394 - The borrow checker was fixed to avoid potential unsoundness when using
395 match ergonomics: [#52213][52213].
397 [52213]: https://github.com/rust-lang/rust/issues/52213
399 Version 1.27.1 (2018-07-10)
400 ===========================
405 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
406 when running, which enabled executing code as some other user on a
407 given machine. This release fixes that vulnerability; you can read
408 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
410 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
415 - The borrow checker was fixed to avoid an additional potential unsoundness when using
416 match ergonomics: [#51415][51415], [#49534][49534].
418 [51415]: https://github.com/rust-lang/rust/issues/51415
419 [49534]: https://github.com/rust-lang/rust/issues/49534
420 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
421 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
423 Version 1.27.0 (2018-06-21)
424 ==========================
428 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
429 be used as an identifier.
430 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
431 bare `Trait` syntax, and should make it clearer when being used in tandem with
432 `impl Trait` because it is equivalent to the following syntax:
433 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
434 `Box<Trait> == Box<dyn Trait>`.
435 - [Attributes on generic parameters such as types and lifetimes are
436 now stable.][48851] e.g.
437 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
438 - [The `#[must_use]` attribute can now also be used on functions as well as
439 types.][48925] It provides a lint that by default warns users when the
440 value returned by a function has not been used.
444 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
448 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
449 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
450 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
451 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
453 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
454 std are now available in core.][49896]
455 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
457 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
458 that the operation isn't done in place.
459 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
460 the `#[must_use]` attribute][49533] to warn about unused potentially
461 expensive allocations.
465 - [`DoubleEndedIterator::rfind`]
466 - [`DoubleEndedIterator::rfold`]
467 - [`DoubleEndedIterator::try_rfold`]
468 - [`Duration::from_micros`]
469 - [`Duration::from_nanos`]
470 - [`Duration::subsec_micros`]
471 - [`Duration::subsec_millis`]
472 - [`HashMap::remove_entry`]
473 - [`Iterator::try_fold`]
474 - [`Iterator::try_for_each`]
477 - [`String::replace_range`]
478 - [`Take::set_limit`]
479 - [`hint::unreachable_unchecked`]
480 - [`os::unix::process::parent_id`]
481 - [`ptr::swap_nonoverlapping`]
482 - [`slice::rsplit_mut`]
484 - [`slice::swap_with_slice`]
488 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
489 `readme`, and `repository` fields.][cargo/5386]
490 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
491 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
492 a different directory than `target` for placing compilation artifacts.
493 - [Cargo will be adding automatic target inference for binaries, benchmarks,
494 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
495 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
496 where cargo would infer a binary, Cargo will produce a warning. You can
497 disable this feature ahead of time by setting any of the following to false:
498 `autobins`, `autobenches`, `autoexamples`, `autotests`.
499 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
500 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
504 - [Added “The Rustc book” into the official documentation.][49707]
505 [“The Rustc book”] documents and teaches how to use the rustc compiler.
506 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
510 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
511 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
512 compile, `"".is_empty()` will still compile.
513 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
514 will only print the inner type.][48553] E.g.
515 `print!("{:?}", AtomicBool::new(true))` will print `true`,
516 not `AtomicBool(true)`.
517 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
518 could enter higher numbers but they were not supported by LLVM. Up to 512MB
519 alignment should cover all use cases.
520 - The `.description()` method on the `std::error::Error` trait
521 [has been soft-deprecated][50163]. It is no longer required to implement it.
523 [48553]: https://github.com/rust-lang/rust/pull/48553/
524 [48851]: https://github.com/rust-lang/rust/pull/48851/
525 [48925]: https://github.com/rust-lang/rust/pull/48925/
526 [49533]: https://github.com/rust-lang/rust/pull/49533/
527 [49623]: https://github.com/rust-lang/rust/pull/49623/
528 [49630]: https://github.com/rust-lang/rust/pull/49630/
529 [49664]: https://github.com/rust-lang/rust/pull/49664/
530 [49699]: https://github.com/rust-lang/rust/pull/49699/
531 [49707]: https://github.com/rust-lang/rust/pull/49707/
532 [49719]: https://github.com/rust-lang/rust/pull/49719/
533 [49896]: https://github.com/rust-lang/rust/pull/49896/
534 [49968]: https://github.com/rust-lang/rust/pull/49968/
535 [50163]: https://github.com/rust-lang/rust/pull/50163
536 [50177]: https://github.com/rust-lang/rust/pull/50177/
537 [50378]: https://github.com/rust-lang/rust/pull/50378/
538 [50398]: https://github.com/rust-lang/rust/pull/50398/
539 [50423]: https://github.com/rust-lang/rust/pull/50423/
540 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
541 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
542 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
543 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
544 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
545 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
546 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
547 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
548 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
549 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
550 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
551 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
552 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
553 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
554 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
555 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
556 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
557 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
558 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
559 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
560 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
561 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
562 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
563 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
564 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
565 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
566 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
567 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
568 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
569 [“The Rustc book”]: https://doc.rust-lang.org/rustc
572 Version 1.26.2 (2018-06-05)
573 ==========================
578 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
580 [51117]: https://github.com/rust-lang/rust/issues/51117
583 Version 1.26.1 (2018-05-29)
584 ==========================
589 - [RLS now works on Windows.][50646]
590 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
596 - [`fn main() -> impl Trait` no longer works for non-Termination
598 This reverts an accidental stabilization.
599 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
600 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
602 [50646]: https://github.com/rust-lang/rust/issues/50646
603 [50656]: https://github.com/rust-lang/rust/pull/50656
604 [50812]: https://github.com/rust-lang/rust/pull/50812
605 [50950]: https://github.com/rust-lang/rust/issues/50950
606 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
608 Version 1.26.0 (2018-05-10)
609 ==========================
613 - [Closures now implement `Copy` and/or `Clone` if all captured variables
614 implement either or both traits.][49299]
615 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
616 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
617 lifetime can be elided.][49458]
618 - [`impl Trait` is now stable allowing you to have abstract types in returns
619 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
620 `fn open(path: impl AsRef<Path>)`.
621 - [Pattern matching will now automatically apply dereferences.][49394]
622 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
623 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
624 - [A lot of operations are now available in a const context.][46882] E.g. You
625 can now index into constant arrays, reference and dereference into constants,
626 and use tuple struct constructors.
627 - [Fixed entry slice patterns are now stable.][48516] E.g.
629 let points = [1, 2, 3, 4];
631 [1, 2, 3, 4] => println!("All points were sequential."),
632 _ => println!("Not all points were sequential."),
639 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
640 - [Fixed exponential projection complexity on nested types.][48296]
641 This can provide up to a ~12% reduction in compile times for certain crates.
642 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
643 to remap path prefixes outputted by the compiler.
644 - [Added `powerpc-unknown-netbsd` target.][48281]
648 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
649 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
650 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
651 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
652 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
653 - [`ascii::escape_default` is now available in libcore.][48735]
654 - [Trailing commas are now supported in std and core macros.][48056]
655 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
656 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
661 - [`*const T::copy_to_nonoverlapping`]
662 - [`*const T::copy_to`]
663 - [`*const T::read_unaligned`]
664 - [`*const T::read_volatile`]
667 - [`*const T::wrapping_add`]
668 - [`*const T::wrapping_sub`]
670 - [`*mut T::copy_to_nonoverlapping`]
671 - [`*mut T::copy_to`]
672 - [`*mut T::read_unaligned`]
673 - [`*mut T::read_volatile`]
675 - [`*mut T::replace`]
678 - [`*mut T::wrapping_add`]
679 - [`*mut T::wrapping_sub`]
680 - [`*mut T::write_bytes`]
681 - [`*mut T::write_unaligned`]
682 - [`*mut T::write_volatile`]
685 - [`FromUtf8Error::as_bytes`]
686 - [`LocalKey::try_with`]
688 - [`btree_map::Entry::and_modify`]
689 - [`fs::read_to_string`]
692 - [`hash_map::Entry::and_modify`]
693 - [`iter::FusedIterator`]
694 - [`ops::RangeInclusive`]
695 - [`ops::RangeToInclusive`]
697 - [`slice::rotate_left`]
698 - [`slice::rotate_right`]
704 - [Cargo will now output path to custom commands when `-v` is
705 passed with `--list`][cargo/5041]
706 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
710 - [The second edition of "The Rust Programming Language" book is now recommended
711 over the first.][48404]
716 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
717 syntax is now invalid.
719 use std::ops::Fn as dyn;
720 fn g(_: Box<dyn(std::fmt::Debug)>) {}
722 - [The result of dereferences are no longer promoted to `'static`.][47408]
726 const PAIR: &(i32, i32) = &(0, 1);
727 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
730 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
731 - [`".e0"` will now no longer parse as `0.0` and will instead cause
733 - [Removed hoedown from rustdoc.][48274]
734 - [Bounds on higher-kinded lifetimes a hard error.][48326]
736 [46882]: https://github.com/rust-lang/rust/pull/46882
737 [47379]: https://github.com/rust-lang/rust/pull/47379
738 [47408]: https://github.com/rust-lang/rust/pull/47408
739 [47813]: https://github.com/rust-lang/rust/pull/47813
740 [48056]: https://github.com/rust-lang/rust/pull/48056
741 [48125]: https://github.com/rust-lang/rust/pull/48125
742 [48166]: https://github.com/rust-lang/rust/pull/48166
743 [48235]: https://github.com/rust-lang/rust/pull/48235
744 [48274]: https://github.com/rust-lang/rust/pull/48274
745 [48281]: https://github.com/rust-lang/rust/pull/48281
746 [48296]: https://github.com/rust-lang/rust/pull/48296
747 [48326]: https://github.com/rust-lang/rust/pull/48326
748 [48359]: https://github.com/rust-lang/rust/pull/48359
749 [48404]: https://github.com/rust-lang/rust/pull/48404
750 [48481]: https://github.com/rust-lang/rust/pull/48481
751 [48516]: https://github.com/rust-lang/rust/pull/48516
752 [48628]: https://github.com/rust-lang/rust/pull/48628
753 [48629]: https://github.com/rust-lang/rust/pull/48629
754 [48657]: https://github.com/rust-lang/rust/pull/48657
755 [48735]: https://github.com/rust-lang/rust/pull/48735
756 [48978]: https://github.com/rust-lang/rust/pull/48978
757 [49101]: https://github.com/rust-lang/rust/pull/49101
758 [49109]: https://github.com/rust-lang/rust/pull/49109
759 [49121]: https://github.com/rust-lang/rust/pull/49121
760 [49162]: https://github.com/rust-lang/rust/pull/49162
761 [49184]: https://github.com/rust-lang/rust/pull/49184
762 [49234]: https://github.com/rust-lang/rust/pull/49234
763 [49255]: https://github.com/rust-lang/rust/pull/49255
764 [49299]: https://github.com/rust-lang/rust/pull/49299
765 [49305]: https://github.com/rust-lang/rust/pull/49305
766 [49394]: https://github.com/rust-lang/rust/pull/49394
767 [49458]: https://github.com/rust-lang/rust/pull/49458
768 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
769 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
770 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
771 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
772 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
773 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
774 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
775 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
776 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
777 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
778 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
779 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
780 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
781 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
782 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
783 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
784 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
785 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
786 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
787 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
788 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
789 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
790 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
791 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
792 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
793 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
794 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
795 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
796 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
797 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
798 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
799 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
800 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
801 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
802 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
803 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
804 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
805 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
806 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
807 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
808 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
809 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
812 Version 1.25.0 (2018-03-29)
813 ==========================
817 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
818 - [You can now use nested groups of imports.][47948]
819 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
820 - [You can now have `|` at the start of a match arm.][47947] e.g.
828 | Foo::B => println!("AB"),
829 | Foo::C => println!("C"),
836 - [Upgraded to LLVM 6.][47828]
837 - [Added `-C lto=val` option.][47521]
838 - [Added `i586-unknown-linux-musl` target][47282]
842 - [Impl Send for `process::Command` on Unix.][47760]
843 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
844 - [`UnsafeCell::into_inner` is now safe.][47204]
845 - [Implement libstd for CloudABI.][47268]
846 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
847 - [Implement `AsRef<Path>` for Component][46985]
848 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
849 - [Moved `Duration` to libcore.][46666]
853 - [`Location::column`]
856 The following functions can now be used in a constant expression.
857 eg. `static MINUTE: Duration = Duration::from_secs(60);`
858 - [`Duration::new`][47300]
859 - [`Duration::from_secs`][47300]
860 - [`Duration::from_millis`][47300]
864 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
865 - [`cargo new` now defaults to creating a binary crate, instead of a
866 library crate.][cargo/5029]
870 - [Rust by example is now shipped with new releases][46196]
874 - [Deprecated `net::lookup_host`.][47510]
875 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
876 - The borrow checker was sometimes incorrectly permitting overlapping borrows
877 around indexing operations (see [#47349][47349]). This has been fixed (which also
878 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
879 - [Removed deprecated unstable attribute `#[simd]`.][47251]
881 [33903]: https://github.com/rust-lang/rust/pull/33903
882 [47947]: https://github.com/rust-lang/rust/pull/47947
883 [47948]: https://github.com/rust-lang/rust/pull/47948
884 [47760]: https://github.com/rust-lang/rust/pull/47760
885 [47790]: https://github.com/rust-lang/rust/pull/47790
886 [47828]: https://github.com/rust-lang/rust/pull/47828
887 [47398]: https://github.com/rust-lang/rust/pull/47398
888 [47510]: https://github.com/rust-lang/rust/pull/47510
889 [47521]: https://github.com/rust-lang/rust/pull/47521
890 [47204]: https://github.com/rust-lang/rust/pull/47204
891 [47251]: https://github.com/rust-lang/rust/pull/47251
892 [47268]: https://github.com/rust-lang/rust/pull/47268
893 [47282]: https://github.com/rust-lang/rust/pull/47282
894 [47300]: https://github.com/rust-lang/rust/pull/47300
895 [47349]: https://github.com/rust-lang/rust/pull/47349
896 [46931]: https://github.com/rust-lang/rust/pull/46931
897 [46985]: https://github.com/rust-lang/rust/pull/46985
898 [47006]: https://github.com/rust-lang/rust/pull/47006
899 [46830]: https://github.com/rust-lang/rust/pull/46830
900 [46095]: https://github.com/rust-lang/rust/pull/46095
901 [46666]: https://github.com/rust-lang/rust/pull/46666
902 [46196]: https://github.com/rust-lang/rust/pull/46196
903 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
904 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
905 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
906 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
907 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
910 Version 1.24.1 (2018-03-01)
911 ==========================
913 - [Do not abort when unwinding through FFI][48251]
914 - [Emit UTF-16 files for linker arguments on Windows][48318]
915 - [Make the error index generator work again][48308]
916 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
918 [48251]: https://github.com/rust-lang/rust/issues/48251
919 [48308]: https://github.com/rust-lang/rust/issues/48308
920 [48318]: https://github.com/rust-lang/rust/issues/48318
921 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
924 Version 1.24.0 (2018-02-15)
925 ==========================
929 - [External `sysv64` ffi is now available.][46528]
930 eg. `extern "sysv64" fn foo () {}`
934 - [rustc now uses 16 codegen units by default for release builds.][46910]
935 For the fastest builds, utilize `codegen-units=1`.
936 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
937 - [Add `aarch64-unknown-openbsd` support][46760]
941 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
942 improvement in performance in the majority of cases.
943 - [`OsStr`'s `Debug` implementation is now lossless and consistent
944 with Windows.][46798]
945 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
946 - [impl `From<bool>` for `AtomicBool`][46293]
947 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
948 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
949 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
950 - [float::from_bits now just uses transmute.][46012] This provides
951 some optimisations from LLVM.
952 - [Copied `AsciiExt` methods onto `char`][46077]
953 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
954 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
955 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
956 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
960 - [`RefCell::replace`]
962 - [`atomic::spin_loop_hint`]
964 The following functions can now be used in a constant expression.
965 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
967 - [`AtomicBool::new`][46287]
968 - [`AtomicUsize::new`][46287]
969 - [`AtomicIsize::new`][46287]
970 - [`AtomicPtr::new`][46287]
971 - [`Cell::new`][46287]
972 - [`{integer}::min_value`][46287]
973 - [`{integer}::max_value`][46287]
974 - [`mem::size_of`][46287]
975 - [`mem::align_of`][46287]
976 - [`ptr::null`][46287]
977 - [`ptr::null_mut`][46287]
978 - [`RefCell::new`][46287]
979 - [`UnsafeCell::new`][46287]
983 - [Added a `workspace.default-members` config that
984 overrides implied `--all` in virtual workspaces.][cargo/4743]
985 - [Enable incremental by default on development builds.][cargo/4817] Also added
986 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
987 per-project or global basis respectively.
994 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
995 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
996 in accordance with IETF RFC 4291 §2.2.
997 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
998 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
999 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1000 - [Leading zeros in tuple struct members is now an error][47084]
1001 - [`column!()` macro is one-based instead of zero-based][46977]
1002 - [`fmt::Arguments` can no longer be shared across threads][45198]
1003 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1004 - [Cargo sets a different working directory for the compiler][cargo/4788]
1006 [44884]: https://github.com/rust-lang/rust/pull/44884
1007 [45198]: https://github.com/rust-lang/rust/pull/45198
1008 [45506]: https://github.com/rust-lang/rust/pull/45506
1009 [45904]: https://github.com/rust-lang/rust/pull/45904
1010 [45990]: https://github.com/rust-lang/rust/pull/45990
1011 [46012]: https://github.com/rust-lang/rust/pull/46012
1012 [46077]: https://github.com/rust-lang/rust/pull/46077
1013 [46094]: https://github.com/rust-lang/rust/pull/46094
1014 [46284]: https://github.com/rust-lang/rust/pull/46284
1015 [46287]: https://github.com/rust-lang/rust/pull/46287
1016 [46293]: https://github.com/rust-lang/rust/pull/46293
1017 [46528]: https://github.com/rust-lang/rust/pull/46528
1018 [46671]: https://github.com/rust-lang/rust/pull/46671
1019 [46713]: https://github.com/rust-lang/rust/pull/46713
1020 [46735]: https://github.com/rust-lang/rust/pull/46735
1021 [46749]: https://github.com/rust-lang/rust/pull/46749
1022 [46760]: https://github.com/rust-lang/rust/pull/46760
1023 [46798]: https://github.com/rust-lang/rust/pull/46798
1024 [46828]: https://github.com/rust-lang/rust/pull/46828
1025 [46831]: https://github.com/rust-lang/rust/pull/46831
1026 [46833]: https://github.com/rust-lang/rust/pull/46833
1027 [46910]: https://github.com/rust-lang/rust/pull/46910
1028 [46977]: https://github.com/rust-lang/rust/pull/46977
1029 [47018]: https://github.com/rust-lang/rust/pull/47018
1030 [47080]: https://github.com/rust-lang/rust/pull/47080
1031 [47084]: https://github.com/rust-lang/rust/pull/47084
1032 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1033 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1034 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1035 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1036 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1037 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1040 Version 1.23.0 (2018-01-04)
1041 ==========================
1045 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1046 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1047 Which should fix some confusing errors in some operations.
1051 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1052 undefined behavior.][45920]
1053 - [rustc now suggests renaming import if names clash.][45660]
1054 - [Display errors/warnings correctly when there are zero-width or
1055 wide characters.][45711]
1056 - [rustc now avoids unnecessary copies of arguments that are
1057 simple bindings][45380] This should improve memory usage on average by 5-10%.
1058 - [Updated musl used to build musl rustc to 1.1.17][45393]
1062 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1063 - [Implement Hash for raw pointers to unsized types][45483]
1064 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1065 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1066 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1067 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1068 and `<*mut T>::as_mut`][44932]
1069 - [Optimized `Thread::{park, unpark}` implementation][45524]
1070 - [Improved `SliceExt::binary_search` performance.][45333]
1071 - [impl `FromIterator<()>` for `()`][45379]
1072 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1080 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1081 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1082 - [Added unit test checking to `cargo check`][cargo/4592]
1083 - [Cargo now lets you install a specific version
1084 using `cargo install --version`][cargo/4637]
1088 - [Releases now ship with the Cargo book documentation.][45692]
1089 - [rustdoc now prints rendering warnings on every run.][45324]
1093 - [Changes have been made to type equality to make it more correct,
1094 in rare cases this could break some code.][45853] [Tracking issue for
1095 further information][45852]
1096 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1097 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1098 Android 9, the minimum supported version is Android 14.
1099 - [Bumped the minimum LLVM to 3.9][45326]
1101 [44042]: https://github.com/rust-lang/rust/pull/44042
1102 [44932]: https://github.com/rust-lang/rust/pull/44932
1103 [45267]: https://github.com/rust-lang/rust/pull/45267
1104 [45324]: https://github.com/rust-lang/rust/pull/45324
1105 [45326]: https://github.com/rust-lang/rust/pull/45326
1106 [45333]: https://github.com/rust-lang/rust/pull/45333
1107 [45379]: https://github.com/rust-lang/rust/pull/45379
1108 [45380]: https://github.com/rust-lang/rust/pull/45380
1109 [45393]: https://github.com/rust-lang/rust/pull/45393
1110 [45435]: https://github.com/rust-lang/rust/pull/45435
1111 [45483]: https://github.com/rust-lang/rust/pull/45483
1112 [45524]: https://github.com/rust-lang/rust/pull/45524
1113 [45571]: https://github.com/rust-lang/rust/pull/45571
1114 [45580]: https://github.com/rust-lang/rust/pull/45580
1115 [45610]: https://github.com/rust-lang/rust/pull/45610
1116 [45660]: https://github.com/rust-lang/rust/pull/45660
1117 [45692]: https://github.com/rust-lang/rust/pull/45692
1118 [45711]: https://github.com/rust-lang/rust/pull/45711
1119 [45772]: https://github.com/rust-lang/rust/pull/45772
1120 [45852]: https://github.com/rust-lang/rust/issues/45852
1121 [45853]: https://github.com/rust-lang/rust/pull/45853
1122 [45887]: https://github.com/rust-lang/rust/pull/45887
1123 [45920]: https://github.com/rust-lang/rust/pull/45920
1124 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1125 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1126 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1129 Version 1.22.1 (2017-11-22)
1130 ==========================
1132 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1134 [46183]: https://github.com/rust-lang/rust/pull/46183
1136 Version 1.22.0 (2017-11-22)
1137 ==========================
1141 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1142 - [Now accepts underscores in unicode escapes][43716]
1143 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1144 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1148 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1149 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1150 This should decrease compile times for debug builds.
1151 - [strict memory alignment now enabled on ARMv6][45094]
1152 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1156 - [Allow atomic operations up to 32 bits
1157 on `armv5te_unknown_linux_gnueabi`][44978]
1158 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1159 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1160 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1161 - [Properly detect overflow in `Instant += Duration`.][44220]
1162 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1163 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1164 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1171 - [Cargo will now build multi file examples in subdirectories of the `examples`
1172 folder that have a `main.rs` file.][cargo/4496]
1173 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1174 the old format will continue to work and can be updated with `cargo update`.
1175 - [Now supports vendoring git repositories][cargo/3992]
1179 - [`libbacktrace` is now available on Apple platforms.][44251]
1180 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1181 This now lets you specify that a given code example will fail to compile.
1185 - [The minimum Android version that rustc can build for has been bumped
1186 to `4.0` from `2.3`][45656]
1187 - [Allowing `T op= &T` for numeric types has broken some type
1188 inference cases][45480]
1191 [42526]: https://github.com/rust-lang/rust/pull/42526
1192 [43017]: https://github.com/rust-lang/rust/pull/43017
1193 [43716]: https://github.com/rust-lang/rust/pull/43716
1194 [43949]: https://github.com/rust-lang/rust/pull/43949
1195 [44015]: https://github.com/rust-lang/rust/pull/44015
1196 [44220]: https://github.com/rust-lang/rust/pull/44220
1197 [44251]: https://github.com/rust-lang/rust/pull/44251
1198 [44287]: https://github.com/rust-lang/rust/pull/44287
1199 [44303]: https://github.com/rust-lang/rust/pull/44303
1200 [44456]: https://github.com/rust-lang/rust/pull/44456
1201 [44466]: https://github.com/rust-lang/rust/pull/44466
1202 [44895]: https://github.com/rust-lang/rust/pull/44895
1203 [44966]: https://github.com/rust-lang/rust/pull/44966
1204 [44978]: https://github.com/rust-lang/rust/pull/44978
1205 [45041]: https://github.com/rust-lang/rust/pull/45041
1206 [45064]: https://github.com/rust-lang/rust/pull/45064
1207 [45075]: https://github.com/rust-lang/rust/pull/45075
1208 [45094]: https://github.com/rust-lang/rust/pull/45094
1209 [45095]: https://github.com/rust-lang/rust/pull/45095
1210 [45480]: https://github.com/rust-lang/rust/issues/45480
1211 [45656]: https://github.com/rust-lang/rust/pull/45656
1212 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1213 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1214 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1221 Version 1.21.0 (2017-10-12)
1222 ==========================
1226 - [You can now use static references for literals.][43838]
1230 let x: &'static u32 = &0;
1233 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1236 my_macro!(Vec<i32>::new); // Always worked
1237 my_macro!(Vec::<i32>::new); // Now works
1242 - [Upgraded jemalloc to 4.5.0][43911]
1243 - [Enabled unwinding panics on Redox][43917]
1244 - [Now runs LLVM in parallel during translation phase.][43506]
1245 This should reduce peak memory usage.
1249 - [Generate builtin impls for `Clone` for all arrays and tuples that
1250 are `T: Clone`][43690]
1251 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1252 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1253 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1258 [`std::mem::discriminant`]
1262 - [You can now call `cargo install` with multiple package names][cargo/4216]
1263 - [Cargo commands inside a virtual workspace will now implicitly
1264 pass `--all`][cargo/4335]
1265 - [Added a `[patch]` section to `Cargo.toml` to handle
1266 prepublication dependencies][cargo/4123] [RFC 1969]
1267 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1268 like patterns][cargo/4270]
1269 - [Added the `--all-targets` option][cargo/4400]
1270 - [Using required dependencies as a feature is now deprecated and emits
1271 a warning][cargo/4364]
1276 - [Cargo docs are moving][43916]
1277 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1278 - [The rustdoc book is now available][43863]
1279 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1280 - [Added a preview of RLS has been made available through rustup][44204]
1281 Install with `rustup component add rls-preview`
1282 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1283 Previously only showed `std::os::unix`.
1287 - [Changes in method matching against higher-ranked types][43880] This may cause
1288 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1289 - [rustc's JSON error output's byte position start at top of file.][42973]
1290 Was previously relative to the rustc's internal `CodeMap` struct which
1291 required the unstable library `libsyntax` to correctly use.
1292 - [`unused_results` lint no longer ignores booleans][43728]
1294 [42565]: https://github.com/rust-lang/rust/pull/42565
1295 [42973]: https://github.com/rust-lang/rust/pull/42973
1296 [43348]: https://github.com/rust-lang/rust/pull/43348
1297 [43459]: https://github.com/rust-lang/rust/pull/43459
1298 [43506]: https://github.com/rust-lang/rust/pull/43506
1299 [43540]: https://github.com/rust-lang/rust/pull/43540
1300 [43690]: https://github.com/rust-lang/rust/pull/43690
1301 [43728]: https://github.com/rust-lang/rust/pull/43728
1302 [43838]: https://github.com/rust-lang/rust/pull/43838
1303 [43863]: https://github.com/rust-lang/rust/pull/43863
1304 [43880]: https://github.com/rust-lang/rust/pull/43880
1305 [43911]: https://github.com/rust-lang/rust/pull/43911
1306 [43916]: https://github.com/rust-lang/rust/pull/43916
1307 [43917]: https://github.com/rust-lang/rust/pull/43917
1308 [44204]: https://github.com/rust-lang/rust/pull/44204
1309 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1310 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1311 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1312 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1313 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1314 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1315 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1316 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1317 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1319 Version 1.20.0 (2017-08-31)
1320 ===========================
1324 - [Associated constants are now stabilised.][42809]
1325 - [A lot of macro bugs are now fixed.][42913]
1330 - [Struct fields are now properly coerced to the expected field type.][42807]
1331 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1332 `wasm32-experimental-emscripten` target.
1333 - [Changed some of the error messages to be more helpful.][42033]
1334 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1336 - [rustc now reports the total number of errors on compilation failure][43015]
1337 previously this was only the number of errors in the pass that failed.
1338 - [Expansion in rustc has been sped up 29x.][42533]
1339 - [added `msp430-none-elf` target.][43099]
1340 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1342 - [Fixes backtraces on Redox][43228]
1343 - [rustc now identifies different versions of same crate when absolute paths of
1344 different types match in an error message.][42826]
1350 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1351 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1353 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1354 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1355 - [Impl `Clone` for `DefaultHasher`.][42799]
1356 - [Impl `Sync` for `SyncSender`.][42397]
1357 - [Impl `FromStr` for `char`][42271]
1358 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1360 - [allow messages in the `unimplemented!()` macro.][42155]
1361 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1362 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1363 - [Upgrade to Unicode 10.0.0][42999]
1364 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1365 - [Skip the main thread's manual stack guard on Linux][43072]
1366 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1367 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1369 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1374 - [`CStr::into_c_string`]
1375 - [`CString::as_c_str`]
1376 - [`CString::into_boxed_c_str`]
1377 - [`Chain::get_mut`]
1378 - [`Chain::get_ref`]
1379 - [`Chain::into_inner`]
1380 - [`Option::get_or_insert_with`]
1381 - [`Option::get_or_insert`]
1382 - [`OsStr::into_os_string`]
1383 - [`OsString::into_boxed_os_str`]
1386 - [`Utf8Error::error_len`]
1387 - [`char::EscapeDebug`]
1388 - [`char::escape_debug`]
1389 - [`compile_error!`]
1390 - [`f32::from_bits`]
1392 - [`f64::from_bits`]
1394 - [`mem::ManuallyDrop`]
1395 - [`slice::sort_unstable_by_key`]
1396 - [`slice::sort_unstable_by`]
1397 - [`slice::sort_unstable`]
1398 - [`str::from_boxed_utf8_unchecked`]
1399 - [`str::as_bytes_mut`]
1400 - [`str::as_bytes_mut`]
1401 - [`str::from_utf8_mut`]
1402 - [`str::from_utf8_unchecked_mut`]
1404 - [`str::get_unchecked_mut`]
1405 - [`str::get_unchecked`]
1407 - [`str::into_boxed_bytes`]
1412 - [Cargo API token location moved from `~/.cargo/config` to
1413 `~/.cargo/credentials`.][cargo/3978]
1414 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1415 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1416 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1417 - [You can now specify version of a binary when installed through
1418 `cargo install` using `--vers`.][cargo/4229]
1419 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1420 failure.][cargo/4248]
1421 - [Changed the convention around which file is the crate root.][cargo/4259]
1422 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1423 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1428 - [Functions with `'static` in their return types will now not be as usable as
1429 if they were using lifetime parameters instead.][42417]
1430 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1431 takes the sign of NaN into account where previously didn't.][42430]
1433 [42033]: https://github.com/rust-lang/rust/pull/42033
1434 [42155]: https://github.com/rust-lang/rust/pull/42155
1435 [42271]: https://github.com/rust-lang/rust/pull/42271
1436 [42397]: https://github.com/rust-lang/rust/pull/42397
1437 [42417]: https://github.com/rust-lang/rust/pull/42417
1438 [42430]: https://github.com/rust-lang/rust/pull/42430
1439 [42431]: https://github.com/rust-lang/rust/pull/42431
1440 [42533]: https://github.com/rust-lang/rust/pull/42533
1441 [42571]: https://github.com/rust-lang/rust/pull/42571
1442 [42613]: https://github.com/rust-lang/rust/pull/42613
1443 [42799]: https://github.com/rust-lang/rust/pull/42799
1444 [42807]: https://github.com/rust-lang/rust/pull/42807
1445 [42809]: https://github.com/rust-lang/rust/pull/42809
1446 [42822]: https://github.com/rust-lang/rust/pull/42822
1447 [42826]: https://github.com/rust-lang/rust/pull/42826
1448 [42854]: https://github.com/rust-lang/rust/pull/42854
1449 [42913]: https://github.com/rust-lang/rust/pull/42913
1450 [42999]: https://github.com/rust-lang/rust/pull/42999
1451 [43011]: https://github.com/rust-lang/rust/pull/43011
1452 [43015]: https://github.com/rust-lang/rust/pull/43015
1453 [43072]: https://github.com/rust-lang/rust/pull/43072
1454 [43077]: https://github.com/rust-lang/rust/pull/43077
1455 [43097]: https://github.com/rust-lang/rust/pull/43097
1456 [43099]: https://github.com/rust-lang/rust/pull/43099
1457 [43170]: https://github.com/rust-lang/rust/pull/43170
1458 [43178]: https://github.com/rust-lang/rust/pull/43178
1459 [43185]: https://github.com/rust-lang/rust/pull/43185
1460 [43228]: https://github.com/rust-lang/rust/pull/43228
1461 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1462 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1463 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1464 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1465 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1466 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1467 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1468 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1469 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1470 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1471 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1472 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1473 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1474 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1475 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1476 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1477 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1478 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1479 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1480 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1481 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1482 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1483 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1484 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1485 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1486 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1487 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1488 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1489 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1490 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1491 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1492 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1493 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1494 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1495 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1496 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1497 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1498 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1499 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1502 Version 1.19.0 (2017-07-20)
1503 ===========================
1508 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1509 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1510 - [Macro recursion limit increased to 1024 from 64.][41676]
1511 - [Added lint for detecting unused macros.][41907]
1512 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1513 For example: `let x = loop { break 7; };`
1514 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1515 contain `Copy` types and cannot have a `Drop` implementation.
1516 Example: `union Foo { bar: u8, baz: usize }`
1517 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1518 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1523 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1524 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1525 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1526 you should use `--target armv7-linux-androideabi`.
1527 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1528 - [Minor optimisation of string operations.][42037]
1529 - [Compiler error message is now `aborting due to previous error(s)` instead of
1530 `aborting due to N previous errors`][42150] This was previously inaccurate and
1531 would only count certain kinds of errors.
1532 - [The compiler now supports Visual Studio 2017][42225]
1533 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1534 - [Added a lot][42264] of [new error codes][42302]
1535 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1536 libraries with C Run-time Libraries(CRT) to be statically linked.
1537 - [Fixed various ARM codegen bugs][42740]
1542 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1543 `Extend<Cow<'a, str>>`][41449]
1544 - [`Vec` now implements `From<&mut [T]>`][41530]
1545 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1546 - [`SplitWhitespace` now implements `Clone`][41659]
1547 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1549 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1550 macros, but for printing to stderr.
1555 - [`OsString::shrink_to_fit`]
1558 - [`thread::ThreadId`]
1563 - [Build scripts can now add environment variables to the environment
1564 the crate is being compiled in.
1565 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1566 - [Subcommands now replace the current process rather than spawning a new
1567 child process][cargo/3970]
1568 - [Workspace members can now accept glob file patterns][cargo/3979]
1569 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1570 the members in a given workspace.][cargo/3988]
1571 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1572 - [Target directory path is now in the cargo metadata][cargo/4022]
1573 - [Cargo no longer checks out a local working directory for the
1574 crates.io index][cargo/4026] This should provide smaller file size for the
1575 registry, and improve cloning times, especially on Windows machines.
1576 - [Added an `--exclude` option for excluding certain packages when using the
1577 `--all` option][cargo/4031]
1578 - [Cargo will now automatically retry when receiving a 5xx error
1579 from crates.io][cargo/4032]
1580 - [The `--features` option now accepts multiple comma or space
1581 delimited values.][cargo/4084]
1582 - [Added support for custom target specific runners][cargo/3954]
1587 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1589 - [Rust will now release XZ compressed packages][rust-installer/57]
1590 - [rustup will now prefer to download rust packages with
1591 XZ compression][rustup/1100] over GZip packages.
1592 - [Added the ability to escape `#` in rust documentation][41785] By adding
1593 additional `#`'s ie. `##` is now `#`
1598 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1599 - [`-Z` flags are now no longer allowed to be used on the stable
1600 compiler.][41751] This has been a warning for a year previous to this.
1601 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1602 longer works][42844]. Users should migrate to the built-in `check`
1603 command, which has been available since 1.16.
1604 - [Ending a float literal with `._` is now a hard error.
1605 Example: `42._` .][41946]
1606 - [Any use of a private `extern crate` outside of its module is now a
1607 hard error.][36886] This was previously a warning.
1608 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1609 relative while the `::` prefix makes a path absolute, but was ignored and the
1610 path was relative regardless.
1611 - [Floating point constants in match patterns is now a hard error][36890]
1612 This was previously a warning.
1613 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1614 match patterns is now a hard error][36891] This was previously a warning.
1615 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1617 - [From the pound escape, lines consisting of multiple `#`s are
1619 - [It is an error to re-export private enum variants][42460]. This is
1620 known to break a number of crates that depend on an older version of
1622 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1623 to use it to find the linker, and the build will fail where it did
1624 not previously][42607]
1626 [36886]: https://github.com/rust-lang/rust/issues/36886
1627 [36888]: https://github.com/rust-lang/rust/issues/36888
1628 [36890]: https://github.com/rust-lang/rust/issues/36890
1629 [36891]: https://github.com/rust-lang/rust/issues/36891
1630 [36892]: https://github.com/rust-lang/rust/issues/36892
1631 [37406]: https://github.com/rust-lang/rust/issues/37406
1632 [39983]: https://github.com/rust-lang/rust/pull/39983
1633 [41145]: https://github.com/rust-lang/rust/pull/41145
1634 [41192]: https://github.com/rust-lang/rust/pull/41192
1635 [41258]: https://github.com/rust-lang/rust/pull/41258
1636 [41370]: https://github.com/rust-lang/rust/pull/41370
1637 [41449]: https://github.com/rust-lang/rust/pull/41449
1638 [41530]: https://github.com/rust-lang/rust/pull/41530
1639 [41624]: https://github.com/rust-lang/rust/pull/41624
1640 [41656]: https://github.com/rust-lang/rust/pull/41656
1641 [41659]: https://github.com/rust-lang/rust/pull/41659
1642 [41676]: https://github.com/rust-lang/rust/pull/41676
1643 [41751]: https://github.com/rust-lang/rust/pull/41751
1644 [41764]: https://github.com/rust-lang/rust/pull/41764
1645 [41785]: https://github.com/rust-lang/rust/pull/41785
1646 [41873]: https://github.com/rust-lang/rust/pull/41873
1647 [41907]: https://github.com/rust-lang/rust/pull/41907
1648 [41946]: https://github.com/rust-lang/rust/pull/41946
1649 [42016]: https://github.com/rust-lang/rust/pull/42016
1650 [42037]: https://github.com/rust-lang/rust/pull/42037
1651 [42068]: https://github.com/rust-lang/rust/pull/42068
1652 [42150]: https://github.com/rust-lang/rust/pull/42150
1653 [42162]: https://github.com/rust-lang/rust/pull/42162
1654 [42225]: https://github.com/rust-lang/rust/pull/42225
1655 [42264]: https://github.com/rust-lang/rust/pull/42264
1656 [42302]: https://github.com/rust-lang/rust/pull/42302
1657 [42460]: https://github.com/rust-lang/rust/issues/42460
1658 [42607]: https://github.com/rust-lang/rust/issues/42607
1659 [42740]: https://github.com/rust-lang/rust/pull/42740
1660 [42844]: https://github.com/rust-lang/rust/issues/42844
1661 [42948]: https://github.com/rust-lang/rust/pull/42948
1662 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1663 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1664 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1665 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1666 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1667 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1668 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1669 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1670 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1671 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1672 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1673 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1674 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1675 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1676 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1677 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1678 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1679 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1680 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1681 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1682 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1683 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1686 Version 1.18.0 (2017-06-08)
1687 ===========================
1692 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1693 make the item visible to just that module tree. Also accepts the keyword
1694 `crate` to make something public to the whole crate but not users of the
1695 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1696 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1697 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1698 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1699 types like `Write + Send`, trailing `+` are now supported in trait objects,
1700 and better error reporting for trait objects starting with `?Sized`.
1701 - [0e+10 is now a valid floating point literal][40589]
1702 - [Now warns if you bind a lifetime parameter to 'static][40734]
1703 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1704 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1705 representation in some cases.][40377]
1710 - [rustc can now emit mir with `--emit mir`][39891]
1711 - [Improved LLVM IR for trivial functions][40367]
1712 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1713 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1714 opportunities found through profiling
1715 - [Improved backtrace formatting when panicking][38165]
1720 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1721 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1722 iteration or reallocation.
1723 - [Simplified HashMap Bucket interface][40561] provides performance
1724 improvements for iterating and cloning.
1725 - [Specialize Vec::from_elem to use calloc][40409]
1726 - [Fixed Race condition in fs::create_dir_all][39799]
1727 - [No longer caching stdio on Windows][40516]
1728 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1729 2.50%~ faster and in one case now 12.50% faster.
1730 - [Optimized `AtomicBool::fetch_nand`][41143]
1735 - [`Child::try_wait`]
1736 - [`HashMap::retain`]
1737 - [`HashSet::retain`]
1739 - [`TcpStream::peek`]
1740 - [`UdpSocket::peek`]
1741 - [`UdpSocket::peek_from`]
1746 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1747 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1748 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1749 - [Added Android build support][cargo/3885]
1750 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1751 of a certain type, for example `cargo build --bins` will build all
1753 - [Added support for haiku][cargo/3952]
1758 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1759 - [Added rust-windbg script for better debugging on Windows][39983]
1760 - [Rust now uses the official cross compiler for NetBSD][40612]
1761 - [rustdoc now accepts `#` at the start of files][40828]
1762 - [Fixed jemalloc support for musl][41168]
1767 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1768 always placed after the sign if it exists and before the digits. With the `#`
1769 flag the zeroes are placed after the prefix and before the digits.
1770 - [Due to the struct field optimisation][40377], using `transmute` on structs
1771 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1772 always been undefined behavior, but is now more likely to break in practice.
1773 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1774 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1775 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1776 - [Overlapping inherent `impl`s are now a hard error][40728]
1777 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1778 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1779 `out.asm` and `out.ll` instead of only one of the filetypes.
1780 - [ calling a function that returns `Self` will no longer work][41805] when
1781 the size of `Self` cannot be statically determined.
1782 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1783 this has caused a few regressions namely:
1785 - Changed the link order of local static/dynamic libraries (respecting the
1786 order on given rather than having the compiler reorder).
1787 - Changed how MinGW is linked, native code linked to dynamic libraries
1788 may require manually linking to the gcc support library (for the native
1791 [38165]: https://github.com/rust-lang/rust/pull/38165
1792 [39799]: https://github.com/rust-lang/rust/pull/39799
1793 [39891]: https://github.com/rust-lang/rust/pull/39891
1794 [39983]: https://github.com/rust-lang/rust/pull/39983
1795 [40043]: https://github.com/rust-lang/rust/pull/40043
1796 [40241]: https://github.com/rust-lang/rust/pull/40241
1797 [40338]: https://github.com/rust-lang/rust/pull/40338
1798 [40367]: https://github.com/rust-lang/rust/pull/40367
1799 [40377]: https://github.com/rust-lang/rust/pull/40377
1800 [40409]: https://github.com/rust-lang/rust/pull/40409
1801 [40516]: https://github.com/rust-lang/rust/pull/40516
1802 [40556]: https://github.com/rust-lang/rust/pull/40556
1803 [40561]: https://github.com/rust-lang/rust/pull/40561
1804 [40589]: https://github.com/rust-lang/rust/pull/40589
1805 [40612]: https://github.com/rust-lang/rust/pull/40612
1806 [40723]: https://github.com/rust-lang/rust/pull/40723
1807 [40728]: https://github.com/rust-lang/rust/pull/40728
1808 [40731]: https://github.com/rust-lang/rust/pull/40731
1809 [40734]: https://github.com/rust-lang/rust/pull/40734
1810 [40805]: https://github.com/rust-lang/rust/pull/40805
1811 [40807]: https://github.com/rust-lang/rust/pull/40807
1812 [40828]: https://github.com/rust-lang/rust/pull/40828
1813 [40870]: https://github.com/rust-lang/rust/pull/40870
1814 [41085]: https://github.com/rust-lang/rust/pull/41085
1815 [41143]: https://github.com/rust-lang/rust/pull/41143
1816 [41168]: https://github.com/rust-lang/rust/pull/41168
1817 [41270]: https://github.com/rust-lang/rust/issues/41270
1818 [41469]: https://github.com/rust-lang/rust/pull/41469
1819 [41805]: https://github.com/rust-lang/rust/issues/41805
1820 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1821 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1822 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1823 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1824 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1825 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1826 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1827 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1828 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1829 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1830 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1831 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1832 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1833 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1836 Version 1.17.0 (2017-04-27)
1837 ===========================
1842 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1843 * [Fields of structs may be initialized without duplicating the field/variable
1844 names][39761]. [RFC 1682]
1845 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1846 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1847 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1848 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1849 `'b`. Soundness fix.
1850 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1851 * [Static variables may contain references to other statics][40027]
1856 * [Exit quickly on only `--emit dep-info`][40336]
1857 * [Make `-C relocation-model` more correctly determine whether the linker
1858 creates a position-independent executable][40245]
1859 * [Add `-C overflow-checks` to directly control whether integer overflow
1861 * [The rustc type checker now checks items on demand instead of in a single
1862 in-order pass][40008]. This is mostly an internal refactoring in support of
1863 future work, including incremental type checking, but also resolves [RFC
1864 1647], allowing `Self` to appear in `impl` `where` clauses.
1865 * [Optimize vtable loads][39995]
1866 * [Turn off vectorization for Emscripten targets][39990]
1867 * [Provide suggestions for unknown macros imported with `use`][39953]
1868 * [Fix ICEs in path resolution][39939]
1869 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1870 * [Add clearer error message using `&str + &str`][39116]
1881 * [`Ordering::then`]
1882 * [`Ordering::then_with`]
1883 * [`BTreeMap::range`]
1884 * [`BTreeMap::range_mut`]
1885 * [`collections::Bound`]
1886 * [`process::abort`]
1887 * [`ptr::read_unaligned`]
1888 * [`ptr::write_unaligned`]
1889 * [`Result::expect_err`]
1892 * [`Cell::into_inner`]
1898 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1899 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1900 * [`String` implements `FromIterator<&char>`][40028]
1901 * `Box` [implements][40009] a number of new conversions:
1902 `From<Box<str>> for String`,
1903 `From<Box<[T]>> for Vec<T>`,
1904 `From<Box<CStr>> for CString`,
1905 `From<Box<OsStr>> for OsString`,
1906 `From<Box<Path>> for PathBuf`,
1907 `Into<Box<str>> for String`,
1908 `Into<Box<[T]>> for Vec<T>`,
1909 `Into<Box<CStr>> for CString`,
1910 `Into<Box<OsStr>> for OsString`,
1911 `Into<Box<Path>> for PathBuf`,
1912 `Default for Box<str>`,
1913 `Default for Box<CStr>`,
1914 `Default for Box<OsStr>`,
1915 `From<&CStr> for Box<CStr>`,
1916 `From<&OsStr> for Box<OsStr>`,
1917 `From<&Path> for Box<Path>`
1918 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1919 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1920 * [Slightly optimize `slice::sort`][39538]
1921 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1922 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1923 `Box<str>` implements `From<&str>`][39438]
1924 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1925 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1926 * [`format!` estimates the needed capacity before writing a string][39356]
1927 * [Support unprivileged symlink creation in Windows][38921]
1928 * [`PathBuf` implements `Default`][38764]
1929 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1930 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1931 and poor hash functions.
1936 * [Add `cargo check --all`][cargo/3731]
1937 * [Add an option to ignore SSL revocation checking][cargo/3699]
1938 * [Add `cargo run --package`][cargo/3691]
1939 * [Add `required_features`][cargo/3667]
1940 * [Assume `build.rs` is a build script][cargo/3664]
1941 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1946 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1948 * [The "Unstable Book" documents nightly-only features][ubook]
1949 * [Improve the style of the sidebar in rustdoc output][40265]
1950 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1951 * [Fix MSP430 breakage due to `i128`][40257]
1952 * [Preliminary Solaris/SPARCv9 support][39903]
1953 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1954 run without installing the MSVC runtime.
1955 * [`rustdoc --test` includes file names in test names][39788]
1956 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1957 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1958 * [Initial support for `aarch64-unknown-freebsd`][39491]
1959 * [Initial support for `i686-unknown-netbsd`][39426]
1960 * [This release no longer includes the old makefile build system][39431]. Rust
1961 is built with a custom build system, written in Rust, and with Cargo.
1962 * [Add Debug implementations for libcollection structs][39002]
1963 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1964 * [`--test-threads=0` produces an error][38945]
1965 * [`rustup` installs documentation by default][40526]
1966 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1967 WinDbg and Visual Studio to improve the debugging experience.
1972 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1973 workaround, either use MSVC 2015 or run vcvars.bat.
1974 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1975 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1976 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1978 * [`format!` and `Display::to_string` panic if an underlying formatting
1979 implementation returns an error][40117]. Previously the error was silently
1980 ignored. It is incorrect for `write_fmt` to return an error when writing
1982 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1983 crates were marked stable and could be accessed from the stable toolchain.
1984 * [Rust git source no longer includes vendored crates][39728]. Those that need
1985 to build with vendored crates should build from release tarballs.
1986 * [Fix inert attributes from `proc_macro_derives`][39572]
1987 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1988 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1990 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1991 existing code generally ignores the type of dead-code unless a type-hint is
1992 provided; this can cause surprising inference interactions particularly around
1993 defaulting. The new code uniformly ignores the result type of dead-code.
1994 * [Tuple-struct constructors with private fields are no longer visible][38932]
1995 * [Lifetime parameters that do not appear in the arguments are now considered
1996 early-bound][38897], resolving a soundness bug (#[32330]). The
1997 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1999 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2000 * [Make transmuting from fn item types to pointer-sized types a hard
2003 [27787]: https://github.com/rust-lang/rust/issues/27787
2004 [32330]: https://github.com/rust-lang/rust/issues/32330
2005 [34198]: https://github.com/rust-lang/rust/pull/34198
2006 [38161]: https://github.com/rust-lang/rust/pull/38161
2007 [38368]: https://github.com/rust-lang/rust/pull/38368
2008 [38584]: https://github.com/rust-lang/rust/issues/38584
2009 [38661]: https://github.com/rust-lang/rust/pull/38661
2010 [38764]: https://github.com/rust-lang/rust/pull/38764
2011 [38864]: https://github.com/rust-lang/rust/issues/38864
2012 [38897]: https://github.com/rust-lang/rust/pull/38897
2013 [38921]: https://github.com/rust-lang/rust/pull/38921
2014 [38932]: https://github.com/rust-lang/rust/pull/38932
2015 [38945]: https://github.com/rust-lang/rust/pull/38945
2016 [38981]: https://github.com/rust-lang/rust/pull/38981
2017 [39002]: https://github.com/rust-lang/rust/pull/39002
2018 [39116]: https://github.com/rust-lang/rust/pull/39116
2019 [39193]: https://github.com/rust-lang/rust/pull/39193
2020 [39265]: https://github.com/rust-lang/rust/pull/39265
2021 [39356]: https://github.com/rust-lang/rust/pull/39356
2022 [39372]: https://github.com/rust-lang/rust/pull/39372
2023 [39426]: https://github.com/rust-lang/rust/pull/39426
2024 [39431]: https://github.com/rust-lang/rust/pull/39431
2025 [39438]: https://github.com/rust-lang/rust/pull/39438
2026 [39440]: https://github.com/rust-lang/rust/pull/39440
2027 [39485]: https://github.com/rust-lang/rust/pull/39485
2028 [39491]: https://github.com/rust-lang/rust/pull/39491
2029 [39518]: https://github.com/rust-lang/rust/pull/39518
2030 [39538]: https://github.com/rust-lang/rust/pull/39538
2031 [39572]: https://github.com/rust-lang/rust/pull/39572
2032 [39633]: https://github.com/rust-lang/rust/pull/39633
2033 [39642]: https://github.com/rust-lang/rust/pull/39642
2034 [39728]: https://github.com/rust-lang/rust/pull/39728
2035 [39761]: https://github.com/rust-lang/rust/pull/39761
2036 [39788]: https://github.com/rust-lang/rust/pull/39788
2037 [39793]: https://github.com/rust-lang/rust/pull/39793
2038 [39837]: https://github.com/rust-lang/rust/pull/39837
2039 [39843]: https://github.com/rust-lang/rust/pull/39843
2040 [39851]: https://github.com/rust-lang/rust/pull/39851
2041 [39903]: https://github.com/rust-lang/rust/pull/39903
2042 [39939]: https://github.com/rust-lang/rust/pull/39939
2043 [39953]: https://github.com/rust-lang/rust/pull/39953
2044 [39960]: https://github.com/rust-lang/rust/pull/39960
2045 [39990]: https://github.com/rust-lang/rust/pull/39990
2046 [39995]: https://github.com/rust-lang/rust/pull/39995
2047 [40008]: https://github.com/rust-lang/rust/pull/40008
2048 [40009]: https://github.com/rust-lang/rust/pull/40009
2049 [40027]: https://github.com/rust-lang/rust/pull/40027
2050 [40028]: https://github.com/rust-lang/rust/pull/40028
2051 [40037]: https://github.com/rust-lang/rust/pull/40037
2052 [40117]: https://github.com/rust-lang/rust/pull/40117
2053 [40166]: https://github.com/rust-lang/rust/pull/40166
2054 [40245]: https://github.com/rust-lang/rust/pull/40245
2055 [40257]: https://github.com/rust-lang/rust/pull/40257
2056 [40261]: https://github.com/rust-lang/rust/pull/40261
2057 [40265]: https://github.com/rust-lang/rust/pull/40265
2058 [40319]: https://github.com/rust-lang/rust/pull/40319
2059 [40336]: https://github.com/rust-lang/rust/pull/40336
2060 [40526]: https://github.com/rust-lang/rust/pull/40526
2061 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2062 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2063 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2064 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2065 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2066 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2067 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2068 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2069 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2070 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2071 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2072 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2073 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2074 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2075 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2076 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2077 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2078 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2079 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2080 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2081 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2082 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2083 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2084 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2085 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2086 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2087 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2088 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2089 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2090 [mdbook]: https://crates.io/crates/mdbook
2091 [ubook]: https://doc.rust-lang.org/unstable-book/
2094 Version 1.16.0 (2017-03-16)
2095 ===========================
2100 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2101 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2102 match patterns][38069]
2103 * [Clean up semantics of `self` in an import list][38313]
2104 * [`Self` may appear in `impl` headers][38920]
2105 * [`Self` may appear in struct expressions][39282]
2110 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2111 a `.rmeta` file containing only crate metadata][38571]. This can be
2112 used by tools like the Rust Language Service to perform
2113 metadata-only builds.
2114 * [Levenshtein based typo suggestions now work in most places, while
2115 previously they worked only for fields and sometimes for local
2116 variables][38927]. Together with the overhaul of "no
2117 resolution"/"unexpected resolution" errors (#[38154]) they result in
2118 large and systematic improvement in resolution diagnostics.
2119 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2121 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2122 * [`rustc` no longer attempts to provide "consider using an explicit
2123 lifetime" suggestions][37057]. They were inaccurate.
2128 * [`VecDeque::truncate`]
2129 * [`VecDeque::resize`]
2130 * [`String::insert_str`]
2131 * [`Duration::checked_add`]
2132 * [`Duration::checked_sub`]
2133 * [`Duration::checked_div`]
2134 * [`Duration::checked_mul`]
2137 * [`SocketAddr::is_ipv4`]
2138 * [`SocketAddr::is_ipv6`]
2139 * [`IpAddr::is_ipv4`]
2140 * [`IpAddr::is_ipv6`]
2142 * [`Vec::dedup_by_key`]
2143 * [`Result::unwrap_or_default`]
2144 * [`<*const T>::wrapping_offset`]
2145 * [`<*mut T>::wrapping_offset`]
2146 * `CommandExt::creation_flags`
2147 * [`File::set_permissions`]
2148 * [`String::split_off`]
2153 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2154 their argument by `Borrow` parameter][37761]
2155 * [All public types in std implement `Debug`][38006]
2156 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2157 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2158 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2160 * [std: Fix partial writes in `LineWriter`][38062]
2161 * [std: Clamp max read/write sizes on Unix][38062]
2162 * [Use more specific panic message for `&str` slicing errors][38066]
2163 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2164 functionality cannot be achieved in std currently.
2165 * [`writeln!`, like `println!`, now accepts a form with no string
2166 or formatting arguments, to just print a newline][38469]
2167 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2168 * [Reduce the size of static data in `std_unicode::tables`][38781]
2169 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2170 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2172 * [`Duration` implements `Sum`][38712]
2173 * [`String` implements `ToSocketAddrs`][39048]
2178 * [The `cargo check` command does a type check of a project without
2179 building it][cargo/3296]
2180 * [crates.io will display CI badges from Travis and AppVeyor, if
2181 specified in Cargo.toml][cargo/3546]
2182 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2183 * [Compilation profiles accept integer values for `debug`, in addition
2184 to `true` and `false`. These are passed to `rustc` as the value to
2185 `-C debuginfo`][cargo/3534]
2186 * [Implement `cargo --version --verbose`][cargo/3604]
2187 * [All builds now output 'dep-info' build dependencies compatible with
2188 make and ninja][cargo/3557]
2189 * [Build all workspace members with `build --all`][cargo/3511]
2190 * [Document all workspace members with `doc --all`][cargo/3515]
2191 * [Path deps outside workspace are not members][cargo/3443]
2196 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2197 the path to the Rust implementation][38589]
2198 * [The `armv7-linux-androideabi` target no longer enables NEON
2199 extensions, per Google's ABI guide][38413]
2200 * [The stock standard library can be compiled for Redox OS][38401]
2201 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2203 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2205 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2210 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2211 match patterns][38069]
2212 * In this release, references to uninhabited types can not be
2213 pattern-matched. This was accidentally allowed in 1.15.
2214 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2215 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2217 * [Clean up semantics of `self` in an import list][38313]
2218 * Reimplemented lifetime elision. This change was almost entirely compatible
2219 with existing code, but it did close a number of small bugs and loopholes,
2220 as well as being more accepting in some other [cases][41105].
2222 [37057]: https://github.com/rust-lang/rust/pull/37057
2223 [37761]: https://github.com/rust-lang/rust/pull/37761
2224 [38006]: https://github.com/rust-lang/rust/pull/38006
2225 [38051]: https://github.com/rust-lang/rust/pull/38051
2226 [38062]: https://github.com/rust-lang/rust/pull/38062
2227 [38062]: https://github.com/rust-lang/rust/pull/38622
2228 [38066]: https://github.com/rust-lang/rust/pull/38066
2229 [38069]: https://github.com/rust-lang/rust/pull/38069
2230 [38131]: https://github.com/rust-lang/rust/pull/38131
2231 [38154]: https://github.com/rust-lang/rust/pull/38154
2232 [38274]: https://github.com/rust-lang/rust/pull/38274
2233 [38304]: https://github.com/rust-lang/rust/pull/38304
2234 [38313]: https://github.com/rust-lang/rust/pull/38313
2235 [38314]: https://github.com/rust-lang/rust/pull/38314
2236 [38327]: https://github.com/rust-lang/rust/pull/38327
2237 [38401]: https://github.com/rust-lang/rust/pull/38401
2238 [38413]: https://github.com/rust-lang/rust/pull/38413
2239 [38469]: https://github.com/rust-lang/rust/pull/38469
2240 [38559]: https://github.com/rust-lang/rust/pull/38559
2241 [38571]: https://github.com/rust-lang/rust/pull/38571
2242 [38580]: https://github.com/rust-lang/rust/pull/38580
2243 [38589]: https://github.com/rust-lang/rust/pull/38589
2244 [38670]: https://github.com/rust-lang/rust/pull/38670
2245 [38712]: https://github.com/rust-lang/rust/pull/38712
2246 [38726]: https://github.com/rust-lang/rust/pull/38726
2247 [38781]: https://github.com/rust-lang/rust/pull/38781
2248 [38798]: https://github.com/rust-lang/rust/pull/38798
2249 [38909]: https://github.com/rust-lang/rust/pull/38909
2250 [38920]: https://github.com/rust-lang/rust/pull/38920
2251 [38927]: https://github.com/rust-lang/rust/pull/38927
2252 [39048]: https://github.com/rust-lang/rust/pull/39048
2253 [39282]: https://github.com/rust-lang/rust/pull/39282
2254 [39379]: https://github.com/rust-lang/rust/pull/39379
2255 [41105]: https://github.com/rust-lang/rust/issues/41105
2256 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2257 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2258 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2259 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2260 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2261 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2262 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2263 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2264 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2265 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2266 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2267 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2268 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2269 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2270 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2271 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2272 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2273 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2274 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2275 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2276 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2277 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2278 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2279 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2280 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2281 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2282 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2283 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2284 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2285 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2288 Version 1.15.1 (2017-02-09)
2289 ===========================
2291 * [Fix IntoIter::as_mut_slice's signature][39466]
2292 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2294 [39466]: https://github.com/rust-lang/rust/pull/39466
2295 [39523]: https://github.com/rust-lang/rust/pull/39523
2298 Version 1.15.0 (2017-02-02)
2299 ===========================
2304 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2305 stable. This allows popular code-generating crates like Serde and Diesel to
2306 work ergonomically. [RFC 1681].
2307 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2308 with curly braces][36868]. Part of [RFC 1506].
2309 * [A number of minor changes to name resolution have been activated][37127].
2310 They add up to more consistent semantics, allowing for future evolution of
2311 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2312 details of what is different. The breaking changes here have been transitioned
2313 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2314 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2316 * [`?Sized` can be used in `where` clauses][37791]
2317 * [There is now a limit on the size of monomorphized types and it can be
2318 modified with the `#![type_size_limit]` crate attribute, similarly to
2319 the `#![recursion_limit]` attribute][37789]
2324 * [On Windows, the compiler will apply dllimport attributes when linking to
2325 extern functions][37973]. Additional attributes and flags can control which
2326 library kind is linked and its name. [RFC 1717].
2327 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2328 * [The `--test` flag works with procedural macro crates][38107]
2329 * [Fix `extern "aapcs" fn` ABI][37814]
2330 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2331 * [The `format!` expander recognizes incorrect `printf` and shell-style
2332 formatting directives and suggests the correct format][37613].
2333 * [Only report one error for all unused imports in an import list][37456]
2335 Compiler Performance
2336 --------------------
2338 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2339 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2340 * [Don't clone in `UnificationTable::probe`][37848]
2341 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2342 * [Use small vectors in type walker][37760]
2343 * [Macro expansion performance was improved][37701]
2344 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2345 * [Replace FNV with a faster hash function][37229]
2350 * [`std::iter::Iterator::min_by`]
2351 * [`std::iter::Iterator::max_by`]
2352 * [`std::os::*::fs::FileExt`]
2353 * [`std::sync::atomic::Atomic*::get_mut`]
2354 * [`std::sync::atomic::Atomic*::into_inner`]
2355 * [`std::vec::IntoIter::as_slice`]
2356 * [`std::vec::IntoIter::as_mut_slice`]
2357 * [`std::sync::mpsc::Receiver::try_iter`]
2358 * [`std::os::unix::process::CommandExt::before_exec`]
2359 * [`std::rc::Rc::strong_count`]
2360 * [`std::rc::Rc::weak_count`]
2361 * [`std::sync::Arc::strong_count`]
2362 * [`std::sync::Arc::weak_count`]
2363 * [`std::char::encode_utf8`]
2364 * [`std::char::encode_utf16`]
2365 * [`std::cell::Ref::clone`]
2366 * [`std::io::Take::into_inner`]
2371 * [The standard sorting algorithm has been rewritten for dramatic performance
2372 improvements][38192]. It is a hybrid merge sort, drawing influences from
2373 Timsort. Previously it was a naive merge sort.
2374 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2375 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2377 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2378 and `char_indices().last()`][37882]
2379 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2380 * [Chinese characters display correctly in `fmt::Debug`][37855]
2381 * [Derive `Default` for `Duration`][37699]
2382 * [Support creation of anonymous pipes on WinXP/2k][37677]
2383 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2384 * [Don't pass overlapped handles to processes][38835]
2389 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2390 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2391 should instead check the variable at runtime with `std::env`. That the value
2392 was set at build time was a bug, and incorrect when cross-compiling. This
2393 change is known to cause breakage.
2394 * [Add `--all` flag to `cargo test`][cargo/3221]
2395 * [Compile statically against the MSVC CRT][cargo/3363]
2396 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2397 * [Link OpenSSL statically on OSX][cargo/3311]
2398 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2399 * [Test for bad path overrides with summaries][cargo/3336]
2400 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2401 * [Fix retrying crate downloads for network errors][cargo/3348]
2402 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2403 * [Emit more info on --message-format=json][cargo/3319]
2404 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2405 * [Don't ignore errors in workspace manifest][cargo/3409]
2406 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2411 * [Test runners (binaries built with `--test`) now support a `--list` argument
2412 that lists the tests it contains][38185]
2413 * [Test runners now support a `--exact` argument that makes the test filter
2414 match exactly, instead of matching only a substring of the test name][38181]
2415 * [rustdoc supports a `--playground-url` flag][37763]
2416 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2421 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2422 continue to be used in this release by passing `--disable-rustbuild` to the
2423 configure script, but they will be deleted soon. Note that the new build
2424 system uses a different on-disk layout that will likely affect any scripts
2426 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2428 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2429 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2435 * [A number of minor changes to name resolution have been activated][37127].
2436 They add up to more consistent semantics, allowing for future evolution of
2437 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2438 details of what is different. The breaking changes here have been transitioned
2439 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2440 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2441 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2442 should instead check the variable at runtime with `std::env`. That the value
2443 was set at build time was a bug, and incorrect when cross-compiling. This
2444 change is known to cause breakage.
2445 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2446 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2447 1.10 and is now an error by default. It will become a hard error in the near
2449 * [The semantics relating modules to file system directories are changing in
2450 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2451 lint, which is a warning in this release, and will become a hard error in the
2453 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2454 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2455 the underlying iterator][37834]
2457 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2458 [33685]: https://github.com/rust-lang/rust/issues/33685
2459 [36868]: https://github.com/rust-lang/rust/pull/36868
2460 [37127]: https://github.com/rust-lang/rust/pull/37127
2461 [37229]: https://github.com/rust-lang/rust/pull/37229
2462 [37456]: https://github.com/rust-lang/rust/pull/37456
2463 [37527]: https://github.com/rust-lang/rust/pull/37527
2464 [37602]: https://github.com/rust-lang/rust/pull/37602
2465 [37613]: https://github.com/rust-lang/rust/pull/37613
2466 [37615]: https://github.com/rust-lang/rust/pull/37615
2467 [37636]: https://github.com/rust-lang/rust/pull/37636
2468 [37627]: https://github.com/rust-lang/rust/pull/37627
2469 [37642]: https://github.com/rust-lang/rust/pull/37642
2470 [37677]: https://github.com/rust-lang/rust/pull/37677
2471 [37699]: https://github.com/rust-lang/rust/pull/37699
2472 [37701]: https://github.com/rust-lang/rust/pull/37701
2473 [37705]: https://github.com/rust-lang/rust/pull/37705
2474 [37749]: https://github.com/rust-lang/rust/pull/37749
2475 [37760]: https://github.com/rust-lang/rust/pull/37760
2476 [37763]: https://github.com/rust-lang/rust/pull/37763
2477 [37764]: https://github.com/rust-lang/rust/pull/37764
2478 [37789]: https://github.com/rust-lang/rust/pull/37789
2479 [37791]: https://github.com/rust-lang/rust/pull/37791
2480 [37814]: https://github.com/rust-lang/rust/pull/37814
2481 [37817]: https://github.com/rust-lang/rust/pull/37817
2482 [37834]: https://github.com/rust-lang/rust/pull/37834
2483 [37848]: https://github.com/rust-lang/rust/pull/37848
2484 [37855]: https://github.com/rust-lang/rust/pull/37855
2485 [37882]: https://github.com/rust-lang/rust/pull/37882
2486 [37888]: https://github.com/rust-lang/rust/pull/37888
2487 [37973]: https://github.com/rust-lang/rust/pull/37973
2488 [37979]: https://github.com/rust-lang/rust/pull/37979
2489 [38086]: https://github.com/rust-lang/rust/pull/38086
2490 [38107]: https://github.com/rust-lang/rust/pull/38107
2491 [38117]: https://github.com/rust-lang/rust/pull/38117
2492 [38134]: https://github.com/rust-lang/rust/pull/38134
2493 [38146]: https://github.com/rust-lang/rust/pull/38146
2494 [38181]: https://github.com/rust-lang/rust/pull/38181
2495 [38182]: https://github.com/rust-lang/rust/pull/38182
2496 [38185]: https://github.com/rust-lang/rust/pull/38185
2497 [38192]: https://github.com/rust-lang/rust/pull/38192
2498 [38279]: https://github.com/rust-lang/rust/pull/38279
2499 [38835]: https://github.com/rust-lang/rust/pull/38835
2500 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2501 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2502 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2503 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2504 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2505 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2506 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2507 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2508 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2509 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2510 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2511 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2512 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2513 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2514 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2515 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2516 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2517 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2518 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2519 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2520 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2521 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2522 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2523 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2524 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2525 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2526 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2527 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2528 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2529 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2530 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2531 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2532 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2533 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2534 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2535 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2536 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2537 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2540 Version 1.14.0 (2016-12-22)
2541 ===========================
2546 * [`..` matches multiple tuple fields in enum variants, structs
2547 and tuples][36843]. [RFC 1492].
2548 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2549 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2550 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2551 dereferencing][36822]
2556 * [Mark enums with non-zero discriminant as non-zero][37224]
2557 * [Lower-case `static mut` names are linted like other
2558 statics and consts][37162]
2559 * [Fix ICE on some macros in const integer positions
2560 (e.g. `[u8; m!()]`)][36819]
2561 * [Improve error message and snippet for "did you mean `x`"][36798]
2562 * [Add a panic-strategy field to the target specification][36794]
2563 * [Include LLVM version in `--version --verbose`][37200]
2565 Compile-time Optimizations
2566 --------------------------
2568 * [Improve macro expansion performance][37569]
2569 * [Shrink `Expr_::ExprInlineAsm`][37445]
2570 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2571 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2572 * [Avoid more allocations when compiling html5ever][37373]
2573 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2574 * [Avoid some allocations in the macro parser][37318]
2575 * [Use a faster deflate setting][37298]
2576 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2577 during interning of slices][37270]
2578 * [Optimize `write_metadata`][37267]
2579 * [Don't process obligation forest cycles when stalled][37231]
2580 * [Avoid many `CrateConfig` clones][37161]
2581 * [Optimize `Substs::super_fold_with`][37108]
2582 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2583 * [Speed up `plug_leaks`][36917]
2588 * [`println!()`, with no arguments, prints newline][36825].
2589 Previously, an empty string was required to achieve the same.
2590 * [`Wrapping` impls standard binary and unary operators, as well as
2591 the `Sum` and `Product` iterators][37356]
2592 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2594 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2595 `VecDeque` iterators][37315]
2596 * [Improve `SipHasher` performance on small values][37312]
2597 * [Add Iterator trait TrustedLen to enable better FromIterator /
2599 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2600 * [`ReadDir` implements `Debug`][37221]
2601 * [Implement `RefUnwindSafe` for atomic types][37178]
2602 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2603 * [Avoid allocations in `Decoder::read_str`][37064]
2604 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2605 * [Impl `Debug` for raw pointers to unsized data][36880]
2606 * [Don't reuse `HashMap` random seeds][37470]
2607 * [The internal memory layout of `HashMap` is more cache-friendly, for
2608 significant improvements in some operations][36692]
2609 * [`HashMap` uses less memory on 32-bit architectures][36595]
2610 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2615 * [Expose rustc cfg values to build scripts][cargo/3243]
2616 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2617 * [Fix passing --features when testing multiple packages][cargo/3280]
2618 * [Use a single profile set per workspace][cargo/3249]
2619 * [Load `replace` sections from lock files][cargo/3220]
2620 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2625 * [rustup is the recommended Rust installation method][1.14rustup]
2626 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2627 S390x. These are [tier 2] platforms and may have major defects. Follow the
2628 instructions on the website to install, or add the targets to an existing
2629 installation with `rustup target add`. The new target triples are:
2630 - `mips-unknown-linux-gnu`
2631 - `mipsel-unknown-linux-gnu`
2632 - `mips64-unknown-linux-gnuabi64`
2633 - `mips64el-unknown-linux-gnuabi64 `
2634 - `powerpc-unknown-linux-gnu`
2635 - `powerpc64-unknown-linux-gnu`
2636 - `powerpc64le-unknown-linux-gnu`
2637 - `s390x-unknown-linux-gnu `
2638 * This release includes target (std) builds for ARM Linux running MUSL
2639 libc. These are [tier 2] platforms and may have major defects. Add the
2640 following triples to an existing rustup installation with `rustup target add`:
2641 - `arm-unknown-linux-musleabi`
2642 - `arm-unknown-linux-musleabihf`
2643 - `armv7-unknown-linux-musleabihf`
2644 * This release includes [experimental support for WebAssembly][1.14wasm], via
2645 the `wasm32-unknown-emscripten` target. This target is known to have major
2646 defects. Please test, report, and fix.
2647 * rustup no longer installs documentation by default. Run `rustup
2648 component add rust-docs` to install.
2649 * [Fix line stepping in debugger][37310]
2650 * [Enable line number debuginfo in releases][37280]
2655 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2656 * [Add support for Fuchsia OS][37313]
2657 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2662 * [A number of forward-compatibility lints used by the compiler
2663 to gradually introduce language changes have been converted
2664 to deny by default][36894]:
2665 - ["use of inaccessible extern crate erroneously allowed"][36886]
2666 - ["type parameter default erroneously allowed in invalid location"][36887]
2667 - ["detects super or self keywords at the beginning of global path"][36888]
2668 - ["two overlapping inherent impls define an item with the same name
2669 were erroneously allowed"][36889]
2670 - ["floating-point constants cannot be used in patterns"][36890]
2671 - ["constants of struct or enum type can only be used in a pattern if
2672 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2673 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2674 * [Prohibit patterns in trait methods without bodies][37378]
2675 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2676 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2677 * [The `$crate` macro variable is accepted in fewer locations][37213]
2678 * [Impls specifying extra region requirements beyond the trait
2679 they implement are rejected][37167]
2680 * [Enums may not be unsized][37111]. Unsized enums are intended to
2681 work but never have. For now they are forbidden.
2682 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2684 [tier 2]: https://forge.rust-lang.org/platform-support.html
2685 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2686 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2687 [36430]: https://github.com/rust-lang/rust/pull/36430
2688 [36595]: https://github.com/rust-lang/rust/pull/36595
2689 [36595]: https://github.com/rust-lang/rust/pull/36595
2690 [36692]: https://github.com/rust-lang/rust/pull/36692
2691 [36767]: https://github.com/rust-lang/rust/pull/36767
2692 [36794]: https://github.com/rust-lang/rust/pull/36794
2693 [36798]: https://github.com/rust-lang/rust/pull/36798
2694 [36819]: https://github.com/rust-lang/rust/pull/36819
2695 [36822]: https://github.com/rust-lang/rust/pull/36822
2696 [36825]: https://github.com/rust-lang/rust/pull/36825
2697 [36843]: https://github.com/rust-lang/rust/pull/36843
2698 [36880]: https://github.com/rust-lang/rust/pull/36880
2699 [36886]: https://github.com/rust-lang/rust/issues/36886
2700 [36887]: https://github.com/rust-lang/rust/issues/36887
2701 [36888]: https://github.com/rust-lang/rust/issues/36888
2702 [36889]: https://github.com/rust-lang/rust/issues/36889
2703 [36890]: https://github.com/rust-lang/rust/issues/36890
2704 [36891]: https://github.com/rust-lang/rust/issues/36891
2705 [36892]: https://github.com/rust-lang/rust/issues/36892
2706 [36894]: https://github.com/rust-lang/rust/pull/36894
2707 [36917]: https://github.com/rust-lang/rust/pull/36917
2708 [36993]: https://github.com/rust-lang/rust/pull/36993
2709 [37037]: https://github.com/rust-lang/rust/pull/37037
2710 [37064]: https://github.com/rust-lang/rust/pull/37064
2711 [37094]: https://github.com/rust-lang/rust/pull/37094
2712 [37108]: https://github.com/rust-lang/rust/pull/37108
2713 [37111]: https://github.com/rust-lang/rust/pull/37111
2714 [37161]: https://github.com/rust-lang/rust/pull/37161
2715 [37162]: https://github.com/rust-lang/rust/pull/37162
2716 [37167]: https://github.com/rust-lang/rust/pull/37167
2717 [37178]: https://github.com/rust-lang/rust/pull/37178
2718 [37200]: https://github.com/rust-lang/rust/pull/37200
2719 [37213]: https://github.com/rust-lang/rust/pull/37213
2720 [37221]: https://github.com/rust-lang/rust/pull/37221
2721 [37224]: https://github.com/rust-lang/rust/pull/37224
2722 [37230]: https://github.com/rust-lang/rust/pull/37230
2723 [37231]: https://github.com/rust-lang/rust/pull/37231
2724 [37247]: https://github.com/rust-lang/rust/pull/37247
2725 [37267]: https://github.com/rust-lang/rust/pull/37267
2726 [37270]: https://github.com/rust-lang/rust/pull/37270
2727 [37273]: https://github.com/rust-lang/rust/pull/37273
2728 [37280]: https://github.com/rust-lang/rust/pull/37280
2729 [37298]: https://github.com/rust-lang/rust/pull/37298
2730 [37306]: https://github.com/rust-lang/rust/pull/37306
2731 [37310]: https://github.com/rust-lang/rust/pull/37310
2732 [37312]: https://github.com/rust-lang/rust/pull/37312
2733 [37313]: https://github.com/rust-lang/rust/pull/37313
2734 [37315]: https://github.com/rust-lang/rust/pull/37315
2735 [37318]: https://github.com/rust-lang/rust/pull/37318
2736 [37322]: https://github.com/rust-lang/rust/pull/37322
2737 [37326]: https://github.com/rust-lang/rust/pull/37326
2738 [37351]: https://github.com/rust-lang/rust/pull/37351
2739 [37356]: https://github.com/rust-lang/rust/pull/37356
2740 [37367]: https://github.com/rust-lang/rust/pull/37367
2741 [37373]: https://github.com/rust-lang/rust/pull/37373
2742 [37378]: https://github.com/rust-lang/rust/pull/37378
2743 [37389]: https://github.com/rust-lang/rust/pull/37389
2744 [37392]: https://github.com/rust-lang/rust/pull/37392
2745 [37427]: https://github.com/rust-lang/rust/pull/37427
2746 [37439]: https://github.com/rust-lang/rust/pull/37439
2747 [37445]: https://github.com/rust-lang/rust/pull/37445
2748 [37470]: https://github.com/rust-lang/rust/pull/37470
2749 [37569]: https://github.com/rust-lang/rust/pull/37569
2750 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2751 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2752 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2753 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2754 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2755 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2756 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2759 Version 1.13.0 (2016-11-10)
2760 ===========================
2765 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2766 errors, like the `try!` macro, described in [RFC 0243].
2767 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2768 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2769 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2770 * [Fix lifetime rules for 'if' conditions][36029]
2771 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2776 * [Add the `-C link-arg` argument][36574]
2777 * [Remove the old AST-based backend from rustc_trans][35764]
2778 * [Don't enable NEON by default on armv7 Linux][35814]
2779 * [Fix debug line number info for macro expansions][35238]
2780 * [Do not emit "class method" debuginfo for types that are not
2781 DICompositeType][36008]
2782 * [Warn about multiple conflicting #[repr] hints][34623]
2783 * [When sizing DST, don't double-count nested struct prefixes][36351]
2784 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2785 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2786 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2787 * [Expand macros without recursing to avoid stack overflows][36214]
2792 * [Replace macro backtraces with labeled local uses][35702]
2793 * [Improve error message for misplaced doc comments][33922]
2794 * [Buffer unix and lock windows to prevent message interleaving][35975]
2795 * [Update lifetime errors to specifically note temporaries][36171]
2796 * [Special case a few colors for Windows][36178]
2797 * [Suggest `use self` when such an import resolves][36289]
2798 * [Be more specific when type parameter shadows primitive type][36338]
2799 * Many minor improvements
2801 Compile-time Optimizations
2802 --------------------------
2804 * [Compute and cache HIR hashes at beginning][35854]
2805 * [Don't hash types in loan paths][36004]
2806 * [Cache projections in trans][35761]
2807 * [Optimize the parser's last token handling][36527]
2808 * [Only instantiate #[inline] functions in codegen units referencing
2809 them][36524]. This leads to big improvements in cases where crates export
2810 define many inline functions without using them directly.
2811 * [Lazily allocate TypedArena's first chunk][36592]
2812 * [Don't allocate during default HashSet creation][36734]
2819 * [`overflowing_abs`]
2820 * [`RefCell::try_borrow`]
2821 * [`RefCell::try_borrow_mut`]
2826 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2827 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2829 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2830 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2831 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2832 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2833 * [Use arc4rand on FreeBSD][35884]
2834 * [memrchr: Correct aligned offset computation][35969]
2835 * [Improve Demangling of Rust Symbols][36059]
2836 * [Use monotonic time in condition variables][35048]
2837 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2838 * [Implement conversion traits for `char`][35755]
2839 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2840 * [Zero first byte of CString on drop][36264]
2841 * [Inherit overflow checks for sum and product][36372]
2842 * [Add missing Eq implementations][36423]
2843 * [Implement `Debug` for `DirEntry`][36631]
2844 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2846 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2847 * [Implement more traits for `std::io::ErrorKind`][35911]
2848 * [Optimize BinaryHeap bounds checking][36072]
2849 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2850 `extend_with_element`][36355]
2851 * [Fix overflow checking in unsigned pow()][34942]
2856 * This release includes security fixes to both curl and OpenSSL.
2857 * [Fix transitive doctests when panic=abort][cargo/3021]
2858 * [Add --all-features flag to cargo][cargo/3038]
2859 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2860 * [Don't parse the home directory more than once][cargo/3078]
2861 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2862 * [Update OpenSSL to 1.0.2j][cargo/3121]
2863 * [Add license and license_file to cargo metadata output][cargo/3110]
2864 * [Make crates-io registry URL optional in config; ignore all changes to
2865 source.crates-io][cargo/3089]
2866 * [Don't download dependencies from other platforms][cargo/3123]
2867 * [Build transitive dev-dependencies when needed][cargo/3125]
2868 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2869 * [Avoid updating registry when adding existing deps][cargo/3144]
2870 * [Warn about path overrides that won't work][cargo/3136]
2871 * [Use workspaces during `cargo install`][cargo/3146]
2872 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2873 * [Add --message-format flag][cargo/3000]
2874 * [Pass target environment for rustdoc][cargo/3205]
2875 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2876 * [Update curl and curl-sys][cargo/3241]
2877 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2882 * [rustdoc: Add the `--sysroot` argument][36586]
2883 * [rustdoc: Fix a couple of issues with the search results][35655]
2884 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2885 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2886 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2891 * [Remove unmaintained style guide][35124]
2892 * [Add s390x support][36369]
2893 * [Initial work at Haiku OS support][36727]
2894 * [Add mips-uclibc targets][35734]
2895 * [Crate-ify compiler-rt into compiler-builtins][35021]
2896 * [Add rustc version info (git hash + date) to dist tarball][36213]
2897 * Many documentation improvements
2902 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2903 * [Deny (by default) transmuting from fn item types to pointer-sized
2904 types][34923]. Continuing the long transition to zero-sized fn items,
2906 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2908 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2909 * [Fix lifetime rules for 'if' conditions][36029].
2910 * [Inherit overflow checks for sum and product][36372].
2911 * [Forbid user-defined macros named "macro_rules"][36730].
2913 [33922]: https://github.com/rust-lang/rust/pull/33922
2914 [34623]: https://github.com/rust-lang/rust/pull/34623
2915 [34923]: https://github.com/rust-lang/rust/pull/34923
2916 [34942]: https://github.com/rust-lang/rust/pull/34942
2917 [34982]: https://github.com/rust-lang/rust/pull/34982
2918 [35021]: https://github.com/rust-lang/rust/pull/35021
2919 [35048]: https://github.com/rust-lang/rust/pull/35048
2920 [35074]: https://github.com/rust-lang/rust/pull/35074
2921 [35124]: https://github.com/rust-lang/rust/pull/35124
2922 [35234]: https://github.com/rust-lang/rust/pull/35234
2923 [35238]: https://github.com/rust-lang/rust/pull/35238
2924 [35354]: https://github.com/rust-lang/rust/pull/35354
2925 [35559]: https://github.com/rust-lang/rust/pull/35559
2926 [35585]: https://github.com/rust-lang/rust/pull/35585
2927 [35627]: https://github.com/rust-lang/rust/pull/35627
2928 [35655]: https://github.com/rust-lang/rust/pull/35655
2929 [35702]: https://github.com/rust-lang/rust/pull/35702
2930 [35707]: https://github.com/rust-lang/rust/pull/35707
2931 [35728]: https://github.com/rust-lang/rust/pull/35728
2932 [35734]: https://github.com/rust-lang/rust/pull/35734
2933 [35755]: https://github.com/rust-lang/rust/pull/35755
2934 [35761]: https://github.com/rust-lang/rust/pull/35761
2935 [35764]: https://github.com/rust-lang/rust/pull/35764
2936 [35814]: https://github.com/rust-lang/rust/pull/35814
2937 [35854]: https://github.com/rust-lang/rust/pull/35854
2938 [35871]: https://github.com/rust-lang/rust/pull/35871
2939 [35884]: https://github.com/rust-lang/rust/pull/35884
2940 [35911]: https://github.com/rust-lang/rust/pull/35911
2941 [35969]: https://github.com/rust-lang/rust/pull/35969
2942 [35975]: https://github.com/rust-lang/rust/pull/35975
2943 [36004]: https://github.com/rust-lang/rust/pull/36004
2944 [36008]: https://github.com/rust-lang/rust/pull/36008
2945 [36014]: https://github.com/rust-lang/rust/pull/36014
2946 [36029]: https://github.com/rust-lang/rust/pull/36029
2947 [36059]: https://github.com/rust-lang/rust/pull/36059
2948 [36072]: https://github.com/rust-lang/rust/pull/36072
2949 [36101]: https://github.com/rust-lang/rust/pull/36101
2950 [36104]: https://github.com/rust-lang/rust/pull/36104
2951 [36171]: https://github.com/rust-lang/rust/pull/36171
2952 [36173]: https://github.com/rust-lang/rust/pull/36173
2953 [36178]: https://github.com/rust-lang/rust/pull/36178
2954 [36213]: https://github.com/rust-lang/rust/pull/36213
2955 [36214]: https://github.com/rust-lang/rust/pull/36214
2956 [36264]: https://github.com/rust-lang/rust/pull/36264
2957 [36266]: https://github.com/rust-lang/rust/pull/36266
2958 [36289]: https://github.com/rust-lang/rust/pull/36289
2959 [36338]: https://github.com/rust-lang/rust/pull/36338
2960 [36351]: https://github.com/rust-lang/rust/pull/36351
2961 [36355]: https://github.com/rust-lang/rust/pull/36355
2962 [36369]: https://github.com/rust-lang/rust/pull/36369
2963 [36372]: https://github.com/rust-lang/rust/pull/36372
2964 [36423]: https://github.com/rust-lang/rust/pull/36423
2965 [36482]: https://github.com/rust-lang/rust/pull/36482
2966 [36505]: https://github.com/rust-lang/rust/pull/36505
2967 [36524]: https://github.com/rust-lang/rust/pull/36524
2968 [36527]: https://github.com/rust-lang/rust/pull/36527
2969 [36551]: https://github.com/rust-lang/rust/pull/36551
2970 [36574]: https://github.com/rust-lang/rust/pull/36574
2971 [36586]: https://github.com/rust-lang/rust/pull/36586
2972 [36592]: https://github.com/rust-lang/rust/pull/36592
2973 [36631]: https://github.com/rust-lang/rust/pull/36631
2974 [36639]: https://github.com/rust-lang/rust/pull/36639
2975 [36721]: https://github.com/rust-lang/rust/pull/36721
2976 [36727]: https://github.com/rust-lang/rust/pull/36727
2977 [36730]: https://github.com/rust-lang/rust/pull/36730
2978 [36734]: https://github.com/rust-lang/rust/pull/36734
2979 [36754]: https://github.com/rust-lang/rust/pull/36754
2980 [36995]: https://github.com/rust-lang/rust/pull/36995
2981 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2982 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2983 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2984 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2985 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2986 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2987 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2988 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2989 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2990 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2991 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2992 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2993 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2994 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2995 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2996 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2997 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2998 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2999 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3000 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3001 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3002 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3003 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3004 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3005 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3006 [rustup]: https://www.rustup.rs
3007 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3008 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3009 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3010 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3011 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3012 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3013 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3016 Version 1.12.1 (2016-10-20)
3017 ===========================
3022 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3023 * [Confusion with double negation and booleans][36856]
3024 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3025 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3026 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3027 * [Corrupted memory after updated to 1.12][36936]
3028 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3029 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3030 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3032 [36381]: https://github.com/rust-lang/rust/issues/36381
3033 [36856]: https://github.com/rust-lang/rust/issues/36856
3034 [36875]: https://github.com/rust-lang/rust/issues/36875
3035 [36924]: https://github.com/rust-lang/rust/issues/36924
3036 [36926]: https://github.com/rust-lang/rust/issues/36926
3037 [36936]: https://github.com/rust-lang/rust/issues/36936
3038 [37026]: https://github.com/rust-lang/rust/issues/37026
3039 [37112]: https://github.com/rust-lang/rust/issues/37112
3040 [37153]: https://github.com/rust-lang/rust/issues/37153
3043 Version 1.12.0 (2016-09-29)
3044 ===========================
3049 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3050 This translation pass is far simpler than the previous AST->LLVM pass, and
3051 creates opportunities to perform new optimizations directly on the MIR. It
3052 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3053 * [`rustc` presents a new, more readable error format, along with
3054 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3055 Most common editors supporting Rust have been updated to work with it. It was
3056 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3061 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3062 This translation pass is far simpler than the previous AST->LLVM pass, and
3063 creates opportunities to perform new optimizations directly on the MIR. It
3064 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3065 * [Print the Rust target name, not the LLVM target name, with
3066 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3067 * [The computation of `TypeId` is correct in some cases where it was previously
3068 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3069 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3070 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3071 `--print relocation-models`, and `--print code-models` print the available
3072 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3073 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3074 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3075 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3076 These targets produce statically-linked binaries. There are no binary release
3082 * [`rustc` presents a new, more readable error format, along with
3083 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3084 Most common editors supporting Rust have been updated to work with it. It was
3085 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3086 * [In error descriptions, references are now described in plain English,
3087 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3088 * [In error type descriptions, unknown numeric types are named `{integer}` or
3089 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3090 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3095 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3096 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3097 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3098 useful](https://github.com/rust-lang/rust/pull/34908)
3099 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3100 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3101 * [Semicolons are properly required as statement delimiters inside
3102 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3103 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3108 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3109 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3110 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3111 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3112 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3113 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3114 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3115 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3116 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3117 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3118 Both on Unix and Windows.
3119 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3120 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3121 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3122 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3123 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3124 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3125 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3126 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3131 * [The `format!` macro and friends now allow a single argument to be formatted
3132 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3133 * [The lifetime bounds on `[T]::binary_search_by` and
3134 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3135 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3136 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3137 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3138 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3139 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3140 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3141 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3142 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3143 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3144 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3145 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3146 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3147 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3148 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3149 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3150 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3151 * [`mpsc::sync_channel` `Receiver`s return any available message before
3152 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3153 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3154 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3159 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3160 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3161 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3162 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3163 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3164 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3165 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3166 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3167 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3168 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3169 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3170 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3171 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3172 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3173 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3174 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3179 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3180 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3185 * [Test binaries now support a `--test-threads` argument to specify the number
3186 of threads used to run tests, and which acts the same as the
3187 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3188 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3189 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3190 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3191 * [Rust releases now come with source packages that can be installed by rustup
3192 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3193 The resulting source code can be used by tools and IDES, located in the
3194 sysroot under `lib/rustlib/src`.
3199 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3200 * Many minor improvements to the documentation.
3201 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3206 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3207 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3208 * [When formatting strings, if "precision" is specified, the "fill",
3209 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3210 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3213 Version 1.11.0 (2016-08-18)
3214 ===========================
3219 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3220 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3221 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3222 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3223 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3228 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3229 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3230 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3231 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3232 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3233 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3234 (in libcore - previously stabilized in libstd)
3235 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3236 (in libcore - previously stabilized in libstd)
3237 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3238 (in libcore - previously stabilized in libstd)
3239 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3240 (in libcore - previously stabilized in libstd)
3241 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3242 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3243 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3244 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3249 * [The `thread_local!` macro supports multiple definitions in a single
3250 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3251 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3252 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3253 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3254 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3255 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3256 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3257 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3262 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3263 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3264 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3265 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3266 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3267 and `-vv` prints warnings for all crates.
3268 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3269 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3270 This provides room for expansion by arbitrary tools.
3271 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3272 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3273 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3274 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3275 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3276 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3277 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3282 * [Caching projections speeds up type check dramatically for some
3283 workloads](https://github.com/rust-lang/rust/pull/33816)
3284 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3285 This hasher is faster, but is believed to provide sufficient
3286 protection from collision attacks.
3287 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3292 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3293 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3294 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3295 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3296 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3301 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3302 * [When emitting debug info, rustc emits frame pointers for closures,
3303 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3304 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3305 * Many more errors have been given error codes and extended
3307 * API documentation continues to be improved, with many new examples
3312 * [rustc no longer hangs when dependencies recursively re-export
3313 submodules](https://github.com/rust-lang/rust/pull/34542)
3314 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3315 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3316 rewritten](https://github.com/rust-lang/rust/pull/33895)
3317 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3318 No targets use this yet, but it works toward AVR support.
3323 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3324 * [The new follow-set rules that place restrictions on `macro_rules!`
3325 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3326 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3327 and has been a warning since 1.10.
3328 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3329 This causes breakage in some corner cases.
3332 Version 1.10.0 (2016-07-07)
3333 ===========================
3338 * [Allow `concat_idents!` in type positions as well as in expression
3339 positions](https://github.com/rust-lang/rust/pull/33735).
3340 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3341 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3342 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3343 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3344 * [`panic!` can be converted to a runtime abort with the
3345 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3346 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3347 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3348 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3349 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3350 Note that Cargo does not yet directly support cdylibs.
3355 * `os::windows::fs::OpenOptionsExt::access_mode`
3356 * `os::windows::fs::OpenOptionsExt::share_mode`
3357 * `os::windows::fs::OpenOptionsExt::custom_flags`
3358 * `os::windows::fs::OpenOptionsExt::attributes`
3359 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3360 * `os::unix::fs::OpenOptionsExt::custom_flags`
3361 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3362 * `Default for sync::Weak`
3363 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3364 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3365 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3366 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3367 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3368 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3369 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3370 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3371 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3372 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3373 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3374 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3375 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3376 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3377 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3378 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3379 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3380 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3381 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3382 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3383 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3384 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3385 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3386 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3387 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3388 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3389 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3390 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3391 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3392 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3393 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3394 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3395 * Read/Write/RawFd impls for `UnixStream`
3396 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3397 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3398 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3399 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3400 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3401 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3402 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3403 * RawFd impls for `UnixListener`
3404 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3405 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3406 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3407 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3408 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3409 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3410 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3411 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3412 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3413 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3414 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3415 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3416 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3417 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3418 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3419 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3420 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3421 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3422 * RawFd impls for `UnixDatagram`
3423 * `{BTree,Hash}Map::values_mut`
3424 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3429 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3430 The semantics of this minor method are subtle and probably not what
3432 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3433 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3434 will fall back to `/dev/urandom` temporarily to avoid blocking
3435 during early boot](https://github.com/rust-lang/rust/pull/33086).
3436 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3437 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3438 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3439 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3440 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3441 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3442 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3446 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3447 This controls the runtime behavior of the `panic!` macro
3448 and can be either "unwind" (the default), or "abort".
3449 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3450 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3451 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3452 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3453 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3454 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3455 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3456 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3457 By default they are retried twice, which can be customized with the
3458 `net.retry` value in `.cargo/config`.
3459 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3460 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3461 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3462 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3463 Makes it possible to install multiple crates in parallel.
3464 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3465 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3466 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3467 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3468 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3469 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3474 * [rustc memory usage was reduced by refactoring the context used for
3475 type checking](https://github.com/rust-lang/rust/pull/33425).
3476 * [Speed up creation of `HashMap`s by caching the random keys used
3477 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3478 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3479 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3480 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3481 10x faster than the previous lookup tables.
3482 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3487 * Many incremental improvements to documentation and rustdoc.
3488 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3489 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3490 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3491 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3492 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3493 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3494 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3499 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3500 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3501 * [`std` no longer prints backtraces on platforms where the running
3502 module must be loaded with `env::current_exe`, which can't be relied
3503 on](https://github.com/rust-lang/rust/pull/33554).
3504 * This release includes std binaries for the i586-unknown-linux-gnu,
3505 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3506 i586 target is for old x86 hardware without SSE2, and the armv7
3507 target is for Android running on modern ARM architectures.
3508 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3509 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3510 * [On Unix the runtime aborts by calling `libc::abort` instead of
3511 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3512 * [Rust is now bootstrapped from the previous release of Rust,
3513 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3518 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3519 * [`target_env` for Linux ARM targets is just `gnu`, not
3520 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3521 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3522 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3523 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3524 Affects how macros are parsed.
3525 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3526 * [Feature-gated attributes on macro-generated macro invocations are
3527 now rejected](https://github.com/rust-lang/rust/pull/32791).
3528 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3529 This caused some minor changes to type inference.
3532 Version 1.9.0 (2016-05-26)
3533 ==========================
3538 * The `#[deprecated]` attribute when applied to an API will generate
3539 warnings when used. The warnings may be suppressed with
3540 `#[allow(deprecated)]`. [RFC 1270].
3541 * [`fn` item types are zero sized, and each `fn` names a unique
3542 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3543 `transmute` on a `fn` type will generate a warning for a few cycles,
3544 then will be converted to an error.
3545 * [Field and method resolution understand visibility, so private
3546 fields and methods cannot prevent the proper use of public fields
3547 and methods][1.9fv].
3548 * [The parser considers unicode codepoints in the
3549 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3555 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3556 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3557 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3558 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3559 * [`str::is_char_boundary`]
3560 * [`<*const T>::as_ref`]
3561 * [`<*mut T>::as_ref`]
3562 * [`<*mut T>::as_mut`]
3563 * [`AsciiExt::make_ascii_uppercase`]
3564 * [`AsciiExt::make_ascii_lowercase`]
3565 * [`char::decode_utf16`]
3566 * [`char::DecodeUtf16`]
3567 * [`char::DecodeUtf16Error`]
3568 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3569 * [`BTreeSet::take`]
3570 * [`BTreeSet::replace`]
3573 * [`HashSet::replace`]
3575 * [`OsString::with_capacity`]
3576 * [`OsString::clear`]
3577 * [`OsString::capacity`]
3578 * [`OsString::reserve`]
3579 * [`OsString::reserve_exact`]
3580 * [`OsStr::is_empty`]
3582 * [`std::os::unix::thread`]
3585 * [`JoinHandleExt::as_pthread_t`]
3586 * [`JoinHandleExt::into_pthread_t`]
3587 * [`HashSet::hasher`]
3588 * [`HashMap::hasher`]
3589 * [`CommandExt::exec`]
3590 * [`File::try_clone`]
3591 * [`SocketAddr::set_ip`]
3592 * [`SocketAddr::set_port`]
3593 * [`SocketAddrV4::set_ip`]
3594 * [`SocketAddrV4::set_port`]
3595 * [`SocketAddrV6::set_ip`]
3596 * [`SocketAddrV6::set_port`]
3597 * [`SocketAddrV6::set_flowinfo`]
3598 * [`SocketAddrV6::set_scope_id`]
3599 * [`slice::copy_from_slice`]
3600 * [`ptr::read_volatile`]
3601 * [`ptr::write_volatile`]
3602 * [`OpenOptions::create_new`]
3603 * [`TcpStream::set_nodelay`]
3604 * [`TcpStream::nodelay`]
3605 * [`TcpStream::set_ttl`]
3606 * [`TcpStream::ttl`]
3607 * [`TcpStream::set_only_v6`]
3608 * [`TcpStream::only_v6`]
3609 * [`TcpStream::take_error`]
3610 * [`TcpStream::set_nonblocking`]
3611 * [`TcpListener::set_ttl`]
3612 * [`TcpListener::ttl`]
3613 * [`TcpListener::set_only_v6`]
3614 * [`TcpListener::only_v6`]
3615 * [`TcpListener::take_error`]
3616 * [`TcpListener::set_nonblocking`]
3617 * [`UdpSocket::set_broadcast`]
3618 * [`UdpSocket::broadcast`]
3619 * [`UdpSocket::set_multicast_loop_v4`]
3620 * [`UdpSocket::multicast_loop_v4`]
3621 * [`UdpSocket::set_multicast_ttl_v4`]
3622 * [`UdpSocket::multicast_ttl_v4`]
3623 * [`UdpSocket::set_multicast_loop_v6`]
3624 * [`UdpSocket::multicast_loop_v6`]
3625 * [`UdpSocket::set_multicast_ttl_v6`]
3626 * [`UdpSocket::multicast_ttl_v6`]
3627 * [`UdpSocket::set_ttl`]
3628 * [`UdpSocket::ttl`]
3629 * [`UdpSocket::set_only_v6`]
3630 * [`UdpSocket::only_v6`]
3631 * [`UdpSocket::join_multicast_v4`]
3632 * [`UdpSocket::join_multicast_v6`]
3633 * [`UdpSocket::leave_multicast_v4`]
3634 * [`UdpSocket::leave_multicast_v6`]
3635 * [`UdpSocket::take_error`]
3636 * [`UdpSocket::connect`]
3637 * [`UdpSocket::send`]
3638 * [`UdpSocket::recv`]
3639 * [`UdpSocket::set_nonblocking`]
3644 * [`std::sync::Once` is poisoned if its initialization function
3646 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3647 * [Most types implement `fmt::Debug`][1.9db].
3648 * [The default buffer size used by `BufReader` and `BufWriter` was
3649 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3650 used by other languages.
3651 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3652 `Duration` additionally implements `*=` and `/=`][1.9ta].
3653 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3654 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3655 * [`Chain` implements `BufRead`][1.9ch].
3656 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3661 * [Cargo can now run concurrently][1.9cc].
3662 * [Top-level overrides allow specific revisions of crates to be
3663 overridden through the entire crate graph][1.9ct]. This is intended
3664 to make upgrades easier for large projects, by allowing crates to be
3665 forked temporarily until they've been upgraded and republished.
3666 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3667 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3668 on the commandline][1.9cf]. `rustc` arguments can also be specified
3669 in the `build.rustflags` configuration key.
3674 * [The time complexity of comparing variables for equivalence during type
3675 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3676 to major compilation time improvement in some scenarios.
3677 * [`ToString` is specialized for `str`, giving it the same performance
3678 as `to_owned`][1.9ts].
3679 * [Spawning processes with `Command::output` no longer creates extra
3681 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3682 for C-like enums][1.9cl].
3687 * [Passing the `--quiet` flag to a test runner will produce
3688 much-abbreviated output][1.9q].
3689 * The Rust Project now publishes std binaries for the
3690 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3691 `i586-pc-windows-msvc` targets.
3696 * [`std::sync::Once` is poisoned if its initialization function
3698 * [It is illegal to define methods with the same name in overlapping
3699 inherent `impl` blocks][1.9sn].
3700 * [`fn` item types are zero sized, and each `fn` names a unique
3701 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3702 `transmute` on a `fn` type will generate a warning for a few cycles,
3703 then will be converted to an error.
3704 * [Improvements to const evaluation may trigger new errors when integer
3705 literals are out of range][1.9ce].
3708 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3709 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3710 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3711 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3712 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3713 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3714 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3715 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3716 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3717 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3718 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3719 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3720 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3721 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3722 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3723 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3724 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3725 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3726 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3727 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3728 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3729 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3730 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3731 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3732 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3733 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3734 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3735 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3736 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3737 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3738 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3739 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3740 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3741 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3742 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3743 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3744 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3745 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3746 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3747 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3748 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3749 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3750 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3751 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3752 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3753 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3754 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3755 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3756 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3757 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3758 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3759 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3760 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3761 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3762 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3763 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3764 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3765 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3766 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3767 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3768 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3769 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3770 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3771 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3772 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3773 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3774 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3775 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3776 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3777 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3778 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3779 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3780 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3781 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3782 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3783 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3784 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3785 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3786 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3787 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3788 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3789 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3790 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3791 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3792 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3793 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3794 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3795 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3796 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3797 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3798 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3799 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3800 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3801 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3802 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3803 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3804 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3805 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3806 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3807 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3808 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3809 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3810 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3811 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3812 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3813 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3814 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3815 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3816 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3817 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3820 Version 1.8.0 (2016-04-14)
3821 ==========================
3826 * Rust supports overloading of compound assignment statements like
3827 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3828 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3829 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3831 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3832 addition to the non-braced form, `struct Foo;`. [RFC 218].
3838 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3839 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3842 * [`ptr::drop_in_place`]
3844 * [`time::SystemTime`]
3846 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3847 * [`Instant::elapsed`]
3848 * [`SystemTime::now`]
3849 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3850 * [`SystemTime::elapsed`]
3851 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3852 * [`SystemTimeError`]
3853 * [`SystemTimeError::duration`]
3854 * Various impls for `SystemTimeError`
3856 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3857 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3858 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3859 * [The `write!` and `writeln!` macros correctly emit errors if any of
3860 their arguments can't be formatted][1.8w].
3861 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3862 * [The Unix-specific `raw` modules, which contain a number of
3863 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3864 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3865 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3866 across platforms was making it difficult to implement `std`
3867 correctly. Those that need these definitions should use the `libc`
3869 * The Unix-specific `MetadataExt` traits, including
3870 `os::unix::fs::MetadataExt`, which expose values such as inode
3871 numbers [no longer return platform-specific types][1.8r], but
3872 instead return widened integers. [RFC 1415].
3873 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3874 * [Atomic loads and stores are not volatile][1.8a].
3875 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3880 * [Inlining hash functions lead to a 3% compile-time improvement in
3881 some workloads][1.8h].
3882 * When using jemalloc, its symbols are [unprefixed so that it
3883 overrides the libc malloc implementation][1.8h]. This means that for
3884 rustc, LLVM is now using jemalloc, which results in a 6%
3885 compile-time improvement on a specific workload.
3886 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3891 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3892 i686-pc-windows-msvc is now considered a tier-1 platform.
3893 * [The `--print targets` flag prints a list of supported targets][1.8t].
3894 * [The `--print cfg` flag prints the `cfg`s defined for the current
3896 * [`rustc` can be built with an new Cargo-based build system, written
3897 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3898 build system. To enable it configure with `configure --rustbuild`.
3899 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3900 variants while also indicating the total number of missing variants
3901 if more than 3][1.8m].
3902 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3903 * The Rust Project now publishes binary releases of the standard
3904 library for a number of tier-2 targets:
3905 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3906 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3907 `x86_64-rumprun-netbsd`. These can be installed with
3908 tools such as [multirust][1.8mr].
3913 * [`cargo init` creates a new Cargo project in the current
3914 directory][1.8ci]. It is otherwise like `cargo new`.
3915 * [Cargo has configuration keys for `-v` and
3916 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3917 `[term]` section of `.cargo/config`.
3918 * [Configuration keys that evaluate to strings or integers can be set
3919 via environment variables][1.8ce]. For example the `build.jobs` key
3920 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3921 precedence over config files.
3922 * [Target-specific dependencies support Rust `cfg` syntax for
3923 describing targets][1.8cfg] so that dependencies for multiple
3924 targets can be specified together. [RFC 1361].
3925 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3926 `RUSTDOC` take precedence over the `build.target-dir`,
3927 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3928 * [The child process tree is killed on Windows when Cargo is
3930 * [The `build.target` configuration value sets the target platform,
3931 like `--target`][1.8ct].
3936 * [Unstable compiler flags have been further restricted][1.8u]. Since
3937 1.0 `-Z` flags have been considered unstable, and other flags that
3938 were considered unstable additionally required passing `-Z
3939 unstable-options` to access. Unlike unstable language and library
3940 features though, these options have been accessible on the stable
3941 release channel. Going forward, *new unstable flags will not be
3942 available on the stable release channel*, and old unstable flags
3943 will warn about their usage. In the future, all unstable flags will
3944 be unavailable on the stable release channel.
3945 * [It is no longer possible to `match` on empty enum variants using
3946 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3947 * The Unix-specific `MetadataExt` traits, including
3948 `os::unix::fs::MetadataExt`, which expose values such as inode
3949 numbers [no longer return platform-specific types][1.8r], but
3950 instead return widened integers. [RFC 1415].
3951 * [Modules sourced from the filesystem cannot appear within arbitrary
3952 blocks, but only within other modules][1.8mf].
3953 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3954 * On Unix, [stack overflow triggers a runtime abort instead of a
3956 * [`Command::spawn` and its equivalents return an error if any of
3957 its command-line arguments contain interior `NUL`s][1.8n].
3958 * [Tuple and unit enum variants from other crates are in the type
3960 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3961 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3962 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3963 instead of `foo.lib`.
3966 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3967 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3968 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3969 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3970 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3971 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3972 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3973 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3974 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3975 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3976 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3977 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3978 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3979 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3980 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3981 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3982 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3983 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3984 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3985 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3986 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3987 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3988 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3989 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3990 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3991 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3992 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3993 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3994 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3995 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3996 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3997 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3998 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3999 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4000 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4001 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4002 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4003 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4004 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4005 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4006 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4007 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4008 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4009 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4010 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4011 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4012 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4013 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4014 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4015 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4016 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4017 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4018 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4019 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4020 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4021 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4022 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4023 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4024 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4025 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4028 Version 1.7.0 (2016-03-03)
4029 ==========================
4036 * [`Path::strip_prefix`][] (renamed from relative_from)
4037 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4039 * [`Ipv4Addr::is_loopback`]
4040 * [`Ipv4Addr::is_private`]
4041 * [`Ipv4Addr::is_link_local`]
4042 * [`Ipv4Addr::is_multicast`]
4043 * [`Ipv4Addr::is_broadcast`]
4044 * [`Ipv4Addr::is_documentation`]
4046 * [`Ipv6Addr::is_unspecified`]
4047 * [`Ipv6Addr::is_loopback`]
4048 * [`Ipv6Addr::is_multicast`]
4051 * [`Vec::as_mut_slice`]
4053 * [`String::as_str`]
4054 * [`String::as_mut_str`]
4056 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4058 * `<[T]>::`[`sort_by_key`]
4059 * checked, saturated, and overflowing operations
4060 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4061 * [`i32::saturating_mul`]
4062 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4063 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4064 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4065 * [`u32::saturating_mul`]
4066 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4067 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4068 * and checked, saturated, and overflowing operations for other primitive types
4070 * [`ffi::IntoStringError`]
4071 * [`CString::into_string`]
4072 * [`CString::into_bytes`]
4073 * [`CString::into_bytes_with_nul`]
4074 * `From<CString> for Vec<u8>`
4076 * [`IntoStringError::into_cstring`]
4077 * [`IntoStringError::utf8_error`]
4078 * `Error for IntoStringError`
4080 * [`std::hash::BuildHasher`]
4081 * [`BuildHasher::Hasher`]
4082 * [`BuildHasher::build_hasher`]
4083 * [`std::hash::BuildHasherDefault`]
4084 * [`HashMap::with_hasher`]
4085 * [`HashMap::with_capacity_and_hasher`]
4086 * [`HashSet::with_hasher`]
4087 * [`HashSet::with_capacity_and_hasher`]
4088 * [`std::collections::hash_map::RandomState`]
4089 * [`RandomState::new`]
4090 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4091 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4092 from bytes is faster.
4093 * [The performance of `LineWriter` (and thus `io::stdout`) was
4094 improved by using `memchr` to search for newlines][1.7m].
4095 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4096 `f64` variants were stabilized previously.
4097 * [`BTreeMap` was rewritten to use less memory and improve the performance
4098 of insertion and iteration, the latter by as much as 5x][1.7bm].
4099 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4100 covariant over their contained type][1.7bt].
4101 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4102 over their contained type][1.7ll].
4103 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4105 * [`Any` is implemented for unsized types][1.7a].
4106 * [`Hash` is implemented for `Duration`][1.7h].
4111 * [When running tests with `--test`, rustdoc will pass `--cfg`
4112 arguments to the compiler][1.7dt].
4113 * [The compiler is built with RPATH information by default][1.7rpa].
4114 This means that it will be possible to run `rustc` when installed in
4115 unusual configurations without configuring the dynamic linker search
4117 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4118 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4119 over `LD_LIBRARY_PATH`.
4124 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4125 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4126 * [The `rerun-if-changed` build script directive no longer causes the
4127 build script to incorrectly run twice in certain scenarios][1.7rr].
4132 * Soundness fixes to the interactions between associated types and
4133 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4134 code that violates the new rules. This is a significant change that
4135 is known to break existing code, so it has emitted warnings for the
4136 new error cases since 1.4 to give crate authors time to adapt. The
4137 details of what is changing are subtle; read the RFC for more.
4138 * [Several bugs in the compiler's visibility calculations were
4139 fixed][1.7v]. Since this was found to break significant amounts of
4140 code, the new errors will be emitted as warnings for several release
4141 cycles, under the `private_in_public` lint.
4142 * Defaulted type parameters were accidentally accepted in positions
4143 that were not intended. In this release, [defaulted type parameters
4144 appearing outside of type definitions will generate a
4145 warning][1.7d], which will become an error in future releases.
4146 * [Parsing "." as a float results in an error instead of 0][1.7p].
4147 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4148 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4150 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4151 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4152 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4153 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4154 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4155 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4156 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4157 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4158 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4159 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4160 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4161 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4162 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4163 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4164 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4165 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4166 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4167 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4168 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4169 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4170 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4171 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4172 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4173 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4174 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4175 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4176 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4177 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4178 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4179 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4180 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4181 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4182 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4183 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4184 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4185 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4186 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4187 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4188 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4189 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4190 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4191 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4192 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4193 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4194 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4195 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4196 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4197 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4198 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4199 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4200 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4201 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4202 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4203 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4204 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4205 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4206 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4207 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4208 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4209 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4210 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4211 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4212 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4213 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4214 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4215 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4216 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4217 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4218 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4219 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4220 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4221 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4222 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4223 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4224 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4225 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4226 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4227 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4228 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4231 Version 1.6.0 (2016-01-21)
4232 ==========================
4237 * The `#![no_std]` attribute causes a crate to not be linked to the
4238 standard library, but only the [core library][1.6co], as described
4239 in [RFC 1184]. The core library defines common types and traits but
4240 has no platform dependencies whatsoever, and is the basis for Rust
4241 software in environments that cannot support a full port of the
4242 standard library, such as operating systems. Most of the core
4243 library is now stable.
4249 [`Read::read_exact`],
4250 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4251 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4252 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4253 [`os::unix::fs::DirBuilderExt`],
4254 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4255 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4256 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4257 [`collections::hash_map::Drain`],
4258 [`collections::hash_map::HashMap::drain`],
4259 [`collections::hash_set::Drain`],
4260 [`collections::hash_set::HashSet::drain`],
4261 [`collections::binary_heap::Drain`],
4262 [`collections::binary_heap::BinaryHeap::drain`],
4263 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4264 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4265 [`RwLock::into_inner`],
4266 [`Iterator::min_by_key`][] (renamed from `min_by`),
4267 [`Iterator::max_by_key`][] (renamed from `max_by`).
4268 * The [core library][1.6co] is stable, as are most of its APIs.
4269 * [The `assert_eq!` macro supports arguments that don't implement
4270 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4272 * Several timer functions that take duration in milliseconds [are
4273 deprecated in favor of those that take `Duration`][1.6ms]. These
4274 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4275 `thread::park_timeout_ms`.
4276 * The algorithm by which `Vec` reserves additional elements was
4277 [tweaked to not allocate excessive space][1.6a] while still growing
4279 * `From` conversions are [implemented from integers to floats][1.6f]
4280 in cases where the conversion is lossless. Thus they are not
4281 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4282 or `f64`. They are also not implemented for `isize` and `usize`
4283 because the implementations would be platform-specific. `From` is
4284 also implemented from `f32` to `f64`.
4285 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4286 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4287 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4288 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4290 * Sorting slices that are already sorted [is 50% faster in some
4296 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4297 * Cargo build scripts can specify their dependencies by emitting the
4298 [`rerun-if-changed`][1.6rr] key.
4299 * crates.io will reject publication of crates with dependencies that
4300 have a wildcard version constraint. Crates with wildcard
4301 dependencies were seen to cause a variety of problems, as described
4302 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4304 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4305 release folder. A variety of artifacts that Cargo failed to clean
4306 are now correctly deleted.
4311 * The `unreachable_code` lint [warns when a function call's argument
4313 * The parser indicates [failures that may be caused by
4314 confusingly-similar Unicode characters][1.6uc]
4315 * Certain macro errors [are reported at definition time][1.6m], not
4321 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4322 environment variable when locating crates. This was a pre-cargo
4323 feature for integrating with the package manager that was
4324 accidentally never removed.
4325 * [A number of bugs were fixed in the privacy checker][1.6p] that
4326 could cause previously-accepted code to break.
4327 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4328 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4329 struct pattern syntax (`Foo(..)`) can no longer be used to match
4330 unit structs. This is a warning now, but will become an error in
4331 future releases. Patterns that share the same name as a const are
4333 * A bug was fixed that causes [rustc not to apply default type
4334 parameters][1.6xc] when resolving certain method implementations of
4335 traits defined in other crates.
4337 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4338 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4339 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4340 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4341 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4342 [1.6co]: http://doc.rust-lang.org/core/index.html
4343 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4344 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4345 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4346 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4347 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4348 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4349 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4350 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4351 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4352 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4353 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4354 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4355 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4356 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4357 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4358 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4359 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4360 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4361 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4362 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4363 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4364 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4365 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4366 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4367 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4368 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4369 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4370 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4371 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4372 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4373 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4374 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4375 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4376 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4377 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4378 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4379 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4380 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4381 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4382 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4383 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4386 Version 1.5.0 (2015-12-10)
4387 ==========================
4389 * ~700 changes, numerous bugfixes
4395 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4396 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4397 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4398 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4399 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4400 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4401 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4402 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4403 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4404 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4405 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4406 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4407 [`Path::read_link`], [`Path::symlink_metadata`],
4408 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4409 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4410 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4411 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4412 [`slice::split_first_mut`], [`slice::split_first`],
4413 [`slice::split_last_mut`], [`slice::split_last`],
4414 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4415 [`str::MatchIndices`], [`str::RMatchIndices`],
4416 [`str::match_indices`], [`str::rmatch_indices`],
4417 [`str::slice_mut_unchecked`], [`string::ParseError`].
4418 * Rust applications hosted on crates.io can be installed locally to
4419 `~/.cargo/bin` with the [`cargo install`] command. Among other
4420 things this makes it easier to augment Cargo with new subcommands:
4421 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4422 invoked as `cargo foo`.
4423 * Crates with wildcard (`*`) dependencies will [emit warnings when
4424 published][1.5w]. In 1.6 it will no longer be possible to publish
4425 crates with wildcard dependencies.
4430 * The rules determining when a particular lifetime must outlive
4431 a particular value (known as '[dropck]') have been [modified
4432 to not rely on parametricity][1.5p].
4433 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4434 and `Arc`][1.5a]. Because these smart pointer types implement
4435 `Deref`, this causes breakage in cases where the interior type
4436 contains methods of the same name.
4437 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4438 that they could drop their content. Soundness fix.
4439 * All method invocations are [properly checked][1.5wf1] for
4440 [well-formedness][1.5wf2]. Soundness fix.
4441 * Traits whose supertraits contain `Self` are [not object
4442 safe][1.5o]. Soundness fix.
4443 * Target specifications support a [`no_default_libraries`][1.5nd]
4444 setting that controls whether `-nodefaultlibs` is passed to the
4445 linker, and in turn the `is_like_windows` setting no longer affects
4446 the `-nodefaultlibs` flag.
4447 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4448 * The `#[inline]` and `#[repr]` attributes [can only appear
4449 in valid locations][1.5at].
4450 * Native libraries linked from the local crate are [passed to
4451 the linker before native libraries from upstream crates][1.5nl].
4452 * Two rarely-used attributes, `#[no_debug]` and
4453 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4454 * Negation of unsigned integers, which has been a warning for
4455 several releases, [is now behind a feature gate and will
4456 generate errors][1.5nu].
4457 * The parser accidentally accepted visibility modifiers on
4458 enum variants, a bug [which has been fixed][1.5ev].
4459 * [A bug was fixed that allowed `use` statements to import unstable
4465 * When evaluating expressions at compile-time that are not
4466 compile-time constants (const-evaluating expressions in non-const
4467 contexts), incorrect code such as overlong bitshifts and arithmetic
4468 overflow will [generate a warning instead of an error][1.5ce],
4469 delaying the error until runtime. This will allow the
4470 const-evaluator to be expanded in the future backwards-compatibly.
4471 * The `improper_ctypes` lint [no longer warns about using `isize` and
4472 `usize` in FFI][1.5ict].
4477 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4479 * `Default` is [implemented for mutable slices][1.5d].
4480 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4481 * There are now `From` conversions [between floating point
4482 types][1.5f] where the conversions are lossless.
4483 * There are now `From` conversions [between integer types][1.5i] where
4484 the conversions are lossless.
4485 * [`fs::Metadata` implements `Clone`][1.5fs].
4486 * The `parse` method [accepts a leading "+" when parsing
4488 * [`AsMut` is implemented for `Vec`][1.5am].
4489 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4490 been optimized][1.5cf] and no longer rely on the default impl.
4491 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4492 `unsafe extern "C"` function types now [implement `Clone`,
4493 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4494 `fmt::Debug` for up to 12 arguments][1.5fp].
4495 * [Dropping `Vec`s is much faster in unoptimized builds when the
4496 element types don't implement `Drop`][1.5dv].
4497 * A bug that caused in incorrect behavior when [combining `VecDeque`
4498 with zero-sized types][1.5vdz] was resolved.
4499 * [`PartialOrd` for slices is faster][1.5po].
4504 * [Crate metadata size was reduced by 20%][1.5md].
4505 * [Improvements to code generation reduced the size of libcore by 3.3
4506 MB and rustc's memory usage by 18MB][1.5m].
4507 * [Improvements to deref translation increased performance in
4508 unoptimized builds][1.5dr].
4509 * Various errors in trait resolution [are deduplicated to only be
4510 reported once][1.5te].
4511 * Rust has preliminary [support for rumprun kernels][1.5rr].
4512 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4514 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4515 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4516 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4517 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4518 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4519 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4520 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4521 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4522 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4523 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4524 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4525 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4526 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4527 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4528 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4529 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4530 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4531 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4532 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4533 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4534 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4535 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4536 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4537 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4538 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4539 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4540 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4541 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4542 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4543 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4544 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4545 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4546 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4547 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4548 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4549 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4550 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4551 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4552 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4553 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4554 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4555 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4556 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4557 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4558 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4559 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4560 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4561 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4562 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4563 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4564 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4565 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4566 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4567 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4568 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4569 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4570 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4571 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4572 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4573 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4574 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4575 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4576 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4577 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4578 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4579 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4580 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4581 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4582 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4583 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4584 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4585 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4586 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4587 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4588 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4589 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4590 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4591 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4592 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4593 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4594 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4595 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4596 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4597 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4598 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4599 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4600 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4601 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4602 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4604 Version 1.4.0 (2015-10-29)
4605 ==========================
4607 * ~1200 changes, numerous bugfixes
4612 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4613 GNU) are now supported and recommended for use.
4618 * [Several changes have been made to fix type soundness and improve
4619 the behavior of associated types][sound]. See [RFC 1214]. Although
4620 we have mostly introduced these changes as warnings this release, to
4621 become errors next release, there are still some scenarios that will
4622 see immediate breakage.
4623 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4624 line breaks in addition to `\n`][crlf].
4625 * [Loans of `'static` lifetime extend to the end of a function][stat].
4626 * [`str::parse` no longer introduces avoidable rounding error when
4627 parsing floating point numbers. Together with earlier changes to
4628 float formatting/output, "round trips" like f.to_string().parse()
4629 now preserve the value of f exactly. Additionally, leading plus
4630 signs are now accepted][fp3].
4636 * `use` statements that import multiple items [can now rename
4637 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4638 * [Binops work correctly on fat pointers][binfat].
4639 * `pub extern crate`, which does not behave as expected, [issues a
4640 warning][pec] until a better solution is found.
4645 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4646 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4647 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4648 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4649 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4650 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4651 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4652 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4653 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4654 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4655 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4656 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4657 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4658 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4659 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4660 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4661 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4662 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4664 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4665 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4666 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4667 `f64::from_str_radix`.
4668 * [Reverse-searching strings is faster with the 'two-way'
4670 * [`std::io::copy` allows `?Sized` arguments][cc].
4671 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4672 [override `count`, `nth` and `last` with an O(1)
4673 implementation][it].
4674 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4675 * [`IntoRawFd` has been added to the Unix-specific prelude,
4676 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4678 * [`Extend<String>` and `FromIterator<String` are both implemented for
4680 * [`IntoIterator` is implemented for references to `Option` and
4682 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4683 Copy`][ext] as part of [RFC 839]. This will cause type inference
4684 breakage in rare situations.
4685 * [`BinaryHeap` implements `Debug`][bh2].
4686 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4688 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4689 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4690 * [String comparison is faster][faststr].
4691 * `&mut T` where `T: std::fmt::Write` [also implements
4692 `std::fmt::Write`][mutw].
4693 * [A stable regression in `VecDeque::push_back` and other
4694 capacity-altering methods that caused panics for zero-sized types
4696 * [Function pointers implement traits for up to 12 parameters][fp2].
4701 * The compiler [no longer uses the 'morestack' feature to prevent
4702 stack overflow][mm]. Instead it uses guard pages and stack
4703 probes (though stack probes are not yet implemented on any platform
4705 * [The compiler matches traits faster when projections are involved][p].
4706 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4708 * [Cargo now displays useful information about what its doing during
4709 `cargo update`][cu].
4711 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4712 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4713 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4714 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4715 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4716 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4717 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4718 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4719 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4720 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4721 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4722 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4723 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4724 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4725 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4726 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4727 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4728 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4729 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4730 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4731 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4732 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4733 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4734 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4735 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4736 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4737 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4738 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4739 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4740 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4741 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4742 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4743 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4744 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4745 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4746 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4747 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4748 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4749 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4750 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4751 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4752 [bh2]: https://github.com/rust-lang/rust/pull/28156
4753 [binfat]: https://github.com/rust-lang/rust/pull/28270
4754 [bm]: https://github.com/rust-lang/rust/pull/28197
4755 [cc]: https://github.com/rust-lang/rust/pull/27531
4756 [crlf]: https://github.com/rust-lang/rust/pull/28034
4757 [cu]: https://github.com/rust-lang/cargo/pull/1931
4758 [d]: https://github.com/rust-lang/rust/pull/27825
4759 [dep]: https://github.com/rust-lang/rust/pull/28339
4760 [es]: https://github.com/rust-lang/rust/pull/27956
4761 [ext]: https://github.com/rust-lang/rust/pull/28094
4762 [faststr]: https://github.com/rust-lang/rust/pull/28338
4763 [ffi]: https://github.com/rust-lang/rust/pull/28779
4764 [fp]: https://github.com/rust-lang/rust/pull/28268
4765 [fp2]: https://github.com/rust-lang/rust/pull/28560
4766 [fp3]: https://github.com/rust-lang/rust/pull/27307
4767 [i]: https://github.com/rust-lang/rust/pull/27451
4768 [into2]: https://github.com/rust-lang/rust/pull/28039
4769 [it]: https://github.com/rust-lang/rust/pull/27652
4770 [mm]: https://github.com/rust-lang/rust/pull/27338
4771 [mutw]: https://github.com/rust-lang/rust/pull/28368
4772 [sound]: https://github.com/rust-lang/rust/pull/27641
4773 [p]: https://github.com/rust-lang/rust/pull/27866
4774 [pec]: https://github.com/rust-lang/rust/pull/28486
4775 [pr]: https://github.com/rust-lang/rust/pull/27896
4776 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4777 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4778 [s]: https://github.com/rust-lang/rust/pull/27474
4779 [stab]: https://github.com/rust-lang/rust/pull/28339
4780 [stat]: https://github.com/rust-lang/rust/pull/28321
4781 [vd]: https://github.com/rust-lang/rust/pull/28494
4783 Version 1.3.0 (2015-09-17)
4784 ==============================
4786 * ~900 changes, numerous bugfixes
4791 * The [new object lifetime defaults][nold] have been [turned
4792 on][nold2] after a cycle of warnings about the change. Now types
4793 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4794 being interpreted as `&'a Box<Trait+'a>` to `&'a
4795 Box<Trait+'static>`.
4796 * [The Rustonomicon][nom] is a new book in the official documentation
4797 that dives into writing unsafe Rust.
4798 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4799 timekeeping is employed by other std APIs, as well as out-of-tree
4805 * The [new object lifetime defaults][nold] have been [turned
4806 on][nold2] after a cycle of warnings about the change.
4807 * There is a known [regression][lr] in how object lifetime elision is
4808 interpreted, the proper solution for which is undetermined.
4809 * The `#[prelude_import]` attribute, an internal implementation
4810 detail, was accidentally stabilized previously. [It has been put
4811 behind the `prelude_import` feature gate][pi]. This change is
4812 believed to break no existing code.
4813 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4814 [more sane for dynamically sized types][dst3]. Code that relied on
4815 the previous behavior is thought to be broken.
4816 * The `dropck` rules, which checks that destructors can't access
4817 destroyed values, [have been updated][dropck] to match the
4818 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4819 cause some previously-compiling code to no longer build.
4824 * The [new object lifetime defaults][nold] have been [turned
4825 on][nold2] after a cycle of warnings about the change.
4826 * Semicolons may [now follow types and paths in
4827 macros](https://github.com/rust-lang/rust/pull/27000).
4828 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4829 [more sane for dynamically sized types][dst3]. Code that relied on
4830 the previous behavior is not known to exist, and suspected to be
4832 * `'static` variables [may now be recursive][st].
4833 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4834 implementations correctly.
4835 * The `dropck` rules, which checks that destructors can't access
4836 destroyed values, [have been updated][dropck] to match the
4842 * The [`Duration`] API, [has been stabilized][ds], as well as the
4843 `std::time` module, which presently contains only `Duration`.
4844 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4845 * The owned C string, [`CString`], implements [`Borrow`] and the
4846 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4847 these allow C strings to be borrowed and cloned in generic code.
4848 * [`CStr`] implements [`Debug`].
4849 * [`AtomicPtr`] implements [`Debug`].
4850 * [`Error`] trait objects [can be downcast to their concrete types][e]
4851 in many common configurations, using the [`is`], [`downcast`],
4852 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4854 * Searching for substrings now [employs the two-way algorithm][search]
4855 instead of doing a naive search. This gives major speedups to a
4856 number of methods, including [`contains`][sc], [`find`][sf],
4857 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4858 [`ends_with`][sew] are also faster.
4859 * The performance of `PartialEq` for slices is [much faster][ps].
4860 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4861 is overridden and optimized by the implementations for scalars.
4862 * The [`Hasher`] trait now has a number of specialized `write_*`
4863 methods for primitive types, for efficiency.
4864 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4865 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4866 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4867 of [`std::error::Error::cause`][iec] also delegates to the inner
4869 * [`process::Child`][pc] gained the [`id`] method, which returns a
4870 `u32` representing the platform-specific process identifier.
4871 * The [`connect`] method on slices is deprecated, replaced by the new
4872 [`join`] method (note that both of these are on the *unstable*
4873 [`SliceConcatExt`] trait, but through the magic of the prelude are
4874 available to stable code anyway).
4875 * The [`Div`] operator is implemented for [`Wrapping`] types.
4876 * [`DerefMut` is implemented for `String`][dms].
4877 * Performance of SipHash (the default hasher for `HashMap`) is
4878 [better for long data][sh].
4879 * [`AtomicPtr`] implements [`Send`].
4880 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4881 are now [specialized to use uninitialized buffers for increased
4883 * Lifetime parameters of foreign functions [are now resolved
4889 * Rust can now, with some coercion, [produce programs that run on
4890 Windows XP][xp], though XP is not considered a supported platform.
4891 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4892 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4893 recommended for use in 1.3, though should be fully-functional
4894 in the [64-bit 1.4 beta][b14].
4895 * On Fedora-based systems installation will [properly configure the
4896 dynamic linker][fl].
4897 * The compiler gained many new extended error descriptions, which can
4898 be accessed with the `--explain` flag.
4899 * The `dropck` pass, which checks that destructors can't access
4900 destroyed values, [has been rewritten][dropck]. This fixes some
4901 soundness holes, and as such will cause some previously-compiling
4902 code to no longer build.
4903 * `rustc` now uses [LLVM to write archive files where possible][ar].
4904 Eventually this will eliminate the compiler's dependency on the ar
4906 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4907 supported FreeBSD on x86_64).
4908 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4909 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4911 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4912 will kill the process instead of leaking][nlp].
4914 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4915 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4916 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4917 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4918 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4919 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4920 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4921 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4922 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4923 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4924 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4925 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4926 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4927 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4928 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4929 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4930 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4931 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4932 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4933 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4934 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4935 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4936 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4937 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4938 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4939 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4940 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4941 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4942 [ar]: https://github.com/rust-lang/rust/pull/26926
4943 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4944 [dms]: https://github.com/rust-lang/rust/pull/26241
4945 [dropck]: https://github.com/rust-lang/rust/pull/27261
4946 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4947 [ds]: https://github.com/rust-lang/rust/pull/26818
4948 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4949 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4950 [dst3]: https://github.com/rust-lang/rust/pull/27351
4951 [e]: https://github.com/rust-lang/rust/pull/24793
4952 [f]: https://github.com/rust-lang/rust/pull/26588
4953 [fb]: https://github.com/rust-lang/rust/pull/26959
4954 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4955 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4956 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4957 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4958 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4959 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4960 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4961 [lic]: https://github.com/rust-lang/rust/pull/26583
4962 [lnu]: https://github.com/rust-lang/rust/pull/27026
4963 [lr]: https://github.com/rust-lang/rust/issues/27248
4964 [lum]: https://github.com/rust-lang/rust/pull/26378
4965 [lur]: https://github.com/rust-lang/rust/pull/26783
4966 [nlp]: https://github.com/rust-lang/rust/pull/27176
4967 [nold2]: https://github.com/rust-lang/rust/pull/27045
4968 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4969 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4970 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4971 [pi]: https://github.com/rust-lang/rust/pull/26699
4972 [ps]: https://github.com/rust-lang/rust/pull/26884
4973 [rte]: https://github.com/rust-lang/rust/pull/26950
4974 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4975 [search]: https://github.com/rust-lang/rust/pull/26327
4976 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4977 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4978 [sh]: https://github.com/rust-lang/rust/pull/27280
4979 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4980 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4981 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4982 [st]: https://github.com/rust-lang/rust/pull/26630
4983 [win1]: https://github.com/rust-lang/rust/pull/26569
4984 [win2]: https://github.com/rust-lang/rust/pull/26741
4985 [win3]: https://github.com/rust-lang/rust/pull/26741
4986 [win4]: https://github.com/rust-lang/rust/pull/27210
4987 [xp]: https://github.com/rust-lang/rust/pull/26569
4989 Version 1.2.0 (2015-08-07)
4990 ==========================
4992 * ~1200 changes, numerous bugfixes
4997 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4998 like `Rc` to contain types without a fixed size, arrays and trait
4999 objects, finally enabling use of `Rc<[T]>` and completing the
5000 implementation of DST.
5001 * [Parallel codegen][parcodegen] is now working again, which can
5002 substantially speed up large builds in debug mode; It also gets
5003 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5004 jobs). It's not enabled by default, but will be "in the near
5005 future". It can be activated with the `-C codegen-units=N` flag to
5007 * This is the first release with [experimental support for linking
5008 with the MSVC linker and lib C on Windows (instead of using the GNU
5009 variants via MinGW)][win]. It is yet recommended only for the most
5010 intrepid Rustaceans.
5011 * Benchmark compilations are showing a 30% improvement in
5012 bootstrapping over 1.1.
5017 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5018 unicode case mapping, which is a previously-planned change in
5019 behavior and considered a bugfix.
5020 * [`mem::align_of`] now specifies [the *minimum alignment* for
5021 T][align], which is usually the alignment programs are interested
5022 in, and the same value reported by clang's
5023 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5025 * [The `#[packed]` attribute is no longer silently accepted by the
5026 compiler][packed]. This attribute did nothing and code that
5027 mentioned it likely did not work as intended.
5028 * Associated type defaults are [now behind the
5029 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5030 defaults *did not work*, but could be mentioned syntactically. As
5031 such this breakage has minimal impact.
5036 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5037 matching against dereferenceable values.
5042 * The [`Extend`] trait, which grows a collection from an iterator, is
5043 implemented over iterators of references, for `String`, `Vec`,
5044 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5045 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5046 * The [`iter::once`] function returns an iterator that yields a single
5047 element, and [`iter::empty`] returns an iterator that yields no
5049 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5050 over substring matches.
5051 * [`Cell`] and [`RefCell`] both implement `Eq`.
5052 * A number of methods for wrapping arithmetic are added to the
5053 integral types, [`wrapping_div`], [`wrapping_rem`],
5054 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5055 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5056 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5057 type.. It is illegal for the default arithmetic operations in Rust
5058 to overflow; the desire to wrap must be explicit.
5059 * The `{:#?}` formatting specifier [displays the alternate,
5060 pretty-printed][debugfmt] form of the `Debug` formatter. This
5061 feature was actually introduced prior to 1.0 with little
5063 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5064 for writing data to formatted strings, similar to [`io::Write`].
5065 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5066 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5067 are used by code generators to emit implementations of [`Debug`].
5068 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5069 methods that convert case, following Unicode case mapping.
5070 * It is now easier to handle poisoned locks. The [`PoisonError`]
5071 type, returned by failing lock operations, exposes `into_inner`,
5072 `get_ref`, and `get_mut`, which all give access to the inner lock
5073 guard, and allow the poisoned lock to continue to operate. The
5074 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5075 poisoned lock without attempting to take the lock.
5076 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5077 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5078 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5079 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5081 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5087 * `rustc` employs smarter heuristics for guessing at [typos].
5088 * `rustc` emits more efficient code for [no-op conversions between
5089 unsafe pointers][nop].
5090 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5091 resulting in faster compile times and smaller code.
5093 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5094 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5095 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5096 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5097 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5098 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5099 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5100 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5101 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5102 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5103 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5104 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5105 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5106 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5107 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5108 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5109 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5110 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5111 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5112 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5113 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5114 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5115 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5116 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5117 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5118 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5119 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5120 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5121 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5122 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5123 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5124 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5125 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5126 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5127 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5128 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5129 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5130 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5131 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5132 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5133 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5134 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5135 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5136 [align]: https://github.com/rust-lang/rust/pull/25646
5137 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5138 [typos]: https://github.com/rust-lang/rust/pull/26087
5139 [nop]: https://github.com/rust-lang/rust/pull/26336
5140 [fat]: https://github.com/rust-lang/rust/pull/26411
5141 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5142 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5143 [packed]: https://github.com/rust-lang/rust/pull/25541
5144 [ad]: https://github.com/rust-lang/rust/pull/27382
5145 [win]: https://github.com/rust-lang/rust/pull/25350
5147 Version 1.1.0 (2015-06-25)
5148 =========================
5150 * ~850 changes, numerous bugfixes
5155 * The [`std::fs` module has been expanded][fs] to expand the set of
5156 functionality exposed:
5157 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5158 don't incur a syscall on some platforms.
5159 * A `symlink_metadata` function has been added.
5160 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5161 access to all underlying information.
5162 * The compiler now contains extended explanations of many errors. When an error
5163 with an explanation occurs the compiler suggests using the `--explain` flag
5164 to read the explanation. Error explanations are also [available online][err-index].
5165 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5166 well as other work, the time to bootstrap the compiler decreased by
5172 * The [`str::split_whitespace`] method splits a string on unicode
5173 whitespace boundaries.
5174 * On both Windows and Unix, new extension traits provide conversion of
5175 I/O types to and from the underlying system handles. On Unix, these
5176 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5177 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5178 `TcpListener`, and `UpdSocket`. Further implementations for
5179 `std::process` will be stabilized later.
5180 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5181 Windows, symlinks can be created with
5182 `std::os::windows::symlink_dir` and
5183 `std::os::windows::symlink_file`.
5184 * The `mpsc::Receiver` type can now be converted into an iterator with
5185 `into_iter` on the [`IntoIterator`] trait.
5186 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5187 implementation of the [`From`] trait.
5188 * The `Debug` implementation for `RangeFull` [creates output that is
5189 more consistent with other implementations][rf].
5190 * [`Debug` is implemented for `File`][file].
5191 * The `Default` implementation for `Arc` [no longer requires `Sync +
5193 * [The `Iterator` methods `count`, `nth`, and `last` have been
5194 overridden for slices to have O(1) performance instead of O(n)][si].
5195 * Incorrect handling of paths on Windows has been improved in both the
5196 compiler and the standard library.
5197 * [`AtomicPtr` gained a `Default` implementation][ap].
5198 * In accordance with Rust's policy on arithmetic overflow `abs` now
5199 [panics on overflow when debug assertions are enabled][abs].
5200 * The [`Cloned`] iterator, which was accidentally left unstable for
5201 1.0 [has been stabilized][c].
5202 * The [`Incoming`] iterator, which iterates over incoming TCP
5203 connections, and which was accidentally unnamable in 1.0, [is now
5204 properly exported][inc].
5205 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5206 `sift_up` or `sift_down` panic][bh].
5207 * The [`split_off`] method of `LinkedList` [no longer corrupts
5208 the list in certain scenarios][ll].
5213 * Type checking performance [has improved notably][sk] with
5214 [multiple improvements][pre].
5215 * The compiler [suggests code changes][ch] for more errors.
5216 * rustc and it's build system have experimental support for [building
5217 toolchains against MUSL][m] instead of glibc on Linux.
5218 * The compiler defines the `target_env` cfg value, which is used for
5219 distinguishing toolchains that are otherwise for the same
5220 platform. Presently this is set to `gnu` for common GNU Linux
5221 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5222 * The [`cargo rustc`][crc] command invokes a build with custom flags
5224 * [Android executables are always position independent][pie].
5225 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5228 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5229 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5230 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5231 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5232 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5233 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5234 [rf]: https://github.com/rust-lang/rust/pull/24491
5235 [err-index]: https://doc.rust-lang.org/error-index.html
5236 [sk]: https://github.com/rust-lang/rust/pull/24615
5237 [pre]: https://github.com/rust-lang/rust/pull/25323
5238 [file]: https://github.com/rust-lang/rust/pull/24598
5239 [ch]: https://github.com/rust-lang/rust/pull/24683
5240 [arc]: https://github.com/rust-lang/rust/pull/24695
5241 [si]: https://github.com/rust-lang/rust/pull/24701
5242 [ap]: https://github.com/rust-lang/rust/pull/24834
5243 [m]: https://github.com/rust-lang/rust/pull/24777
5244 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5245 [crc]: https://github.com/rust-lang/cargo/pull/1568
5246 [pie]: https://github.com/rust-lang/rust/pull/24953
5247 [abs]: https://github.com/rust-lang/rust/pull/25441
5248 [c]: https://github.com/rust-lang/rust/pull/25496
5249 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5250 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5251 [inc]: https://github.com/rust-lang/rust/pull/25522
5252 [bh]: https://github.com/rust-lang/rust/pull/25856
5253 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5254 [ll]: https://github.com/rust-lang/rust/pull/26022
5255 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5256 [drop]: https://github.com/rust-lang/rust/pull/24935
5258 Version 1.0.0 (2015-05-15)
5259 ========================
5261 * ~1500 changes, numerous bugfixes
5266 * The vast majority of the standard library is now `#[stable]`. It is
5267 no longer possible to use unstable features with a stable build of
5269 * Many popular crates on [crates.io] now work on the stable release
5271 * Arithmetic on basic integer types now [checks for overflow in debug
5277 * Several [restrictions have been added to trait coherence][coh] in
5278 order to make it easier for upstream authors to change traits
5279 without breaking downstream code.
5280 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5281 improve error messages and macro behavior. For example, `0b1234` is
5282 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5283 * Trait bounds [are always invariant][inv], eliminating the need for
5284 the `PhantomFn` and `MarkerTrait` lang items, which have been
5286 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5287 "foo" as bar` syntax has been replaced with `extern crate foo as
5288 bar`, and Cargo now automatically translates "-" in *package* names
5289 to underscore for the crate name.
5290 * [Lifetime shadowing is an error][lt].
5291 * [`Send` no longer implies `'static`][send-rfc].
5292 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5293 `MyType::default()`.
5294 * Primitive types [now have inherent methods][prim-inherent],
5295 obviating the need for extension traits like `SliceExt`.
5296 * Methods with `Self: Sized` in their `where` clause are [considered
5297 object-safe][self-sized], allowing many extension traits like
5298 `IteratorExt` to be merged into the traits they extended.
5299 * You can now [refer to associated types][assoc-where] whose
5300 corresponding trait bounds appear only in a `where` clause.
5301 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5302 like `Send` and `Sync` are now library-defined.
5303 * A [Reflect trait][reflect] was introduced, which means that
5304 downcasting via the `Any` trait is effectively limited to concrete
5305 types. This helps retain the potentially-important "parametricity"
5306 property: generic code cannot behave differently for different type
5307 arguments except in minor ways.
5308 * The `unsafe_destructor` feature is now deprecated in favor of the
5309 [new `dropck`][dropck]. This change is a major reduction in unsafe
5315 * The `thread_local` module [has been renamed to `std::thread`][th].
5316 * The methods of `IteratorExt` [have been moved to the `Iterator`
5318 * Several traits that implement Rust's conventions for type
5319 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5320 [centralized in the `std::convert` module][con].
5321 * The `FromError` trait [was removed in favor of `From`][fe].
5322 * The basic sleep function [has moved to
5323 `std::thread::sleep_ms`][slp].
5324 * The `splitn` function now takes an `n` parameter that represents the
5325 number of items yielded by the returned iterator [instead of the
5326 number of 'splits'][spl].
5327 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5328 * [Derived implementations of `PartialOrd` now order enums according
5329 to their explicitly-assigned discriminants][po].
5330 * [Methods for searching strings are generic over `Pattern`s][pat],
5331 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5333 * [In method resolution, object methods are resolved before inherent
5335 * [`String::from_str` has been deprecated in favor of the `From` impl,
5336 `String::from`][sf].
5337 * [`io::Error` implements `Sync`][ios].
5338 * [The `words` method on `&str` has been replaced with
5339 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5341 * The new path and IO modules are complete and `#[stable]`. This
5342 was the major library focus for this cycle.
5343 * The path API was [revised][path-normalize] to normalize `.`,
5344 adjusting the tradeoffs in favor of the most common usage.
5345 * A large number of remaining APIs in `std` were also stabilized
5346 during this cycle; about 75% of the non-deprecated API surface
5348 * The new [string pattern API][string-pattern] landed, which makes
5349 the string slice API much more internally consistent and flexible.
5350 * A new set of [generic conversion traits][conversion] replaced
5351 many existing ad hoc traits.
5352 * Generic numeric traits were [completely removed][num-traits]. This
5353 was made possible thanks to inherent methods for primitive types,
5354 and the removal gives maximal flexibility for designing a numeric
5355 hierarchy in the future.
5356 * The `Fn` traits are now related via [inheritance][fn-inherit]
5357 and provide ergonomic [blanket implementations][fn-blanket].
5358 * The `Index` and `IndexMut` traits were changed to
5359 [take the index by value][index-value], enabling code like
5360 `hash_map["string"]` to work.
5361 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5362 `Copy` data is known to be `Clone` as well.
5367 * Many errors now have extended explanations that can be accessed with
5368 the `--explain` flag to `rustc`.
5369 * Many new examples have been added to the standard library
5371 * rustdoc has received a number of improvements focused on completion
5373 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5374 * Much headway was made on ecosystem-wide CI, making it possible
5375 to [compare builds for breakage][ci-compare].
5378 [crates.io]: http://crates.io
5379 [clo]: https://github.com/rust-lang/rust/pull/24034
5380 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5381 [con]: https://github.com/rust-lang/rust/pull/23875
5382 [cr]: https://github.com/rust-lang/rust/pull/23419
5383 [fe]: https://github.com/rust-lang/rust/pull/23879
5384 [ie]: https://github.com/rust-lang/rust/pull/23300
5385 [inv]: https://github.com/rust-lang/rust/pull/23938
5386 [ios]: https://github.com/rust-lang/rust/pull/24133
5387 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5388 [lt]: https://github.com/rust-lang/rust/pull/24057
5389 [meth]: https://github.com/rust-lang/rust/pull/24056
5390 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5391 [po]: https://github.com/rust-lang/rust/pull/24270
5392 [sf]: https://github.com/rust-lang/rust/pull/24517
5393 [slp]: https://github.com/rust-lang/rust/pull/23949
5394 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5395 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5396 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5397 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5398 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5399 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5400 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5401 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5402 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5403 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5404 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5405 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5406 [reflect]: https://github.com/rust-lang/rust/pull/23712
5407 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5408 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5409 [index-value]: https://github.com/rust-lang/rust/pull/23601
5410 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5411 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5412 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5413 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5414 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5415 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5418 Version 1.0.0-alpha.2 (2015-02-20)
5419 =====================================
5421 * ~1300 changes, numerous bugfixes
5425 * The various I/O modules were [overhauled][io-rfc] to reduce
5426 unnecessary abstractions and provide better interoperation with
5427 the underlying platform. The old `io` module remains temporarily
5429 * The standard library now [participates in feature gating][feat],
5430 so use of unstable libraries now requires a `#![feature(...)]`
5431 attribute. The impact of this change is [described on the
5432 forum][feat-forum]. [RFC][feat-rfc].
5436 * `for` loops [now operate on the `IntoIterator` trait][into],
5437 which eliminates the need to call `.iter()`, etc. to iterate
5438 over collections. There are some new subtleties to remember
5439 though regarding what sort of iterators various types yield, in
5440 particular that `for foo in bar { }` yields values from a move
5441 iterator, destroying the original collection. [RFC][into-rfc].
5442 * Objects now have [default lifetime bounds][obj], so you don't
5443 have to write `Box<Trait+'static>` when you don't care about
5444 storing references. [RFC][obj-rfc].
5445 * In types that implement `Drop`, [lifetimes must outlive the
5446 value][drop]. This will soon make it possible to safely
5447 implement `Drop` for types where `#[unsafe_destructor]` is now
5448 required. Read the [gorgeous RFC][drop-rfc] for details.
5449 * The fully qualified <T as Trait>::X syntax lets you set the Self
5450 type for a trait method or associated type. [RFC][ufcs-rfc].
5451 * References to types that implement `Deref<U>` now [automatically
5452 coerce to references][deref] to the dereferenced type `U`,
5453 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5454 should eliminate many unsightly uses of `&*`, as when converting
5455 from references to vectors into references to
5456 slices. [RFC][deref-rfc].
5457 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5458 `|:|`) is obsolete and closure kind is inferred from context.
5459 * [`Self` is a keyword][Self].
5463 * The `Show` and `String` formatting traits [have been
5464 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5465 their related purposes. Automatically getting a string
5466 conversion to use with `format!("{:?}", something_to_debug)` is
5467 now written `#[derive(Debug)]`.
5468 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5469 OsStr}`, provide strings in platform-specific encodings for easier
5470 interop with system APIs. [RFC][osstr-rfc].
5471 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5472 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5473 creating raw pointers.
5477 * Certain long error messages of the form 'expected foo found bar'
5478 are now [split neatly across multiple
5479 lines][multiline]. Examples in the PR.
5480 * On Unix Rust can be [uninstalled][un] by running
5481 `/usr/local/lib/rustlib/uninstall.sh`.
5482 * The `#[rustc_on_unimplemented]` attribute, requiring the
5483 'on_unimplemented' feature, lets rustc [display custom error
5484 messages when a trait is expected to be implemented for a type
5489 * Rust is tested against a [LALR grammar][lalr], which parses
5490 almost all the Rust files that rustc does.
5492 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5493 [close]: https://github.com/rust-lang/rust/pull/21843
5494 [deref]: https://github.com/rust-lang/rust/pull/21351
5495 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5496 [drop]: https://github.com/rust-lang/rust/pull/21972
5497 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5498 [feat]: https://github.com/rust-lang/rust/pull/21248
5499 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5500 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5501 [fmt]: https://github.com/rust-lang/rust/pull/21457
5502 [into]: https://github.com/rust-lang/rust/pull/20790
5503 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5504 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5505 [lalr]: https://github.com/rust-lang/rust/pull/21452
5506 [multiline]: https://github.com/rust-lang/rust/pull/19870
5507 [obj]: https://github.com/rust-lang/rust/pull/22230
5508 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5509 [onun]: https://github.com/rust-lang/rust/pull/20889
5510 [osstr]: https://github.com/rust-lang/rust/pull/21488
5511 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5512 [Self]: https://github.com/rust-lang/rust/pull/22158
5513 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5514 [un]: https://github.com/rust-lang/rust/pull/22256
5517 Version 1.0.0-alpha (2015-01-09)
5518 ==================================
5520 * ~2400 changes, numerous bugfixes
5524 * The language itself is considered feature complete for 1.0,
5525 though there will be many usability improvements and bugfixes
5526 before the final release.
5527 * Nearly 50% of the public API surface of the standard library has
5528 been declared 'stable'. Those interfaces are unlikely to change
5530 * The long-running debate over integer types has been
5531 [settled][ints]: Rust will ship with types named `isize` and
5532 `usize`, rather than `int` and `uint`, for pointer-sized
5533 integers. Guidelines will be rolled out during the alpha cycle.
5534 * Most crates that are not `std` have been moved out of the Rust
5535 distribution into the Cargo ecosystem so they can evolve
5536 separately and don't need to be stabilized as quickly, including
5537 'time', 'getopts', 'num', 'regex', and 'term'.
5538 * Documentation continues to be expanded with more API coverage, more
5539 examples, and more in-depth explanations. The guides have been
5540 consolidated into [The Rust Programming Language][trpl].
5541 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5542 * All official Rust binary installers now come with [Cargo], the
5543 Rust package manager.
5547 * Closures have been [completely redesigned][unboxed] to be
5548 implemented in terms of traits, can now be used as generic type
5549 bounds and thus monomorphized and inlined, or via an opaque
5550 pointer (boxed) as in the old system. The new system is often
5551 referred to as 'unboxed' closures.
5552 * Traits now support [associated types][assoc], allowing families
5553 of related types to be defined together and used generically in
5555 * Enum variants are [namespaced by their type names][enum].
5556 * [`where` clauses][where] provide a more versatile and attractive
5557 syntax for specifying generic bounds, though the previous syntax
5559 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5561 * Rust [no longer has a runtime][rt] of any description, and only
5562 supports OS threads, not green threads.
5563 * At long last, Rust has been overhauled for 'dynamically-sized
5564 types' ([DST]), which integrates 'fat pointers' (object types,
5565 arrays, and `str`) more deeply into the type system, making it
5567 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5568 `..j` that produce range types and which, when combined with the
5569 `Index` operator and multidispatch, leads to a convenient slice
5571 * The new range syntax revealed an ambiguity in the fixed-length
5572 array syntax, so now fixed length arrays [are written `[T;
5574 * The `Copy` trait is no longer implemented automatically. Unsafe
5575 pointers no longer implement `Sync` and `Send` so types
5576 containing them don't automatically either. `Sync` and `Send`
5577 are now 'unsafe traits' so one can "forcibly" implement them via
5578 `unsafe impl` if a type confirms to the requirements for them
5579 even though the internals do not (e.g. structs containing unsafe
5580 pointers like `Arc`). These changes are intended to prevent some
5581 footguns and are collectively known as [opt-in built-in
5582 traits][oibit] (though `Sync` and `Send` will soon become pure
5583 library types unknown to the compiler).
5584 * Operator traits now take their operands [by value][ops], and
5585 comparison traits can use multidispatch to compare one type
5586 against multiple other types, allowing e.g. `String` to be
5587 compared with `&str`.
5588 * `if let` and `while let` are no longer feature-gated.
5589 * Rust has adopted a more [uniform syntax for escaping unicode
5590 characters][unicode].
5591 * `macro_rules!` [has been declared stable][mac]. Though it is a
5592 flawed system it is sufficiently popular that it must be usable
5593 for 1.0. Effort has gone into [future-proofing][mac-future] it
5594 in ways that will allow other macro systems to be developed in
5595 parallel, and won't otherwise impact the evolution of the
5597 * The prelude has been [pared back significantly][prelude] such
5598 that it is the minimum necessary to support the most pervasive
5599 code patterns, and through [generalized where clauses][where]
5600 many of the prelude extension traits have been consolidated.
5601 * Rust's rudimentary reflection [has been removed][refl], as it
5602 incurred too much code generation for little benefit.
5603 * [Struct variants][structvars] are no longer feature-gated.
5604 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5605 known as 'higher-ranked trait bounds', this crucially allows
5606 unboxed closures to work.
5607 * Macros invocations surrounded by parens or square brackets and
5608 not terminated by a semicolon are [parsed as
5609 expressions][macros], which makes expressions like `vec![1i32,
5610 2, 3].len()` work as expected.
5611 * Trait objects now implement their traits automatically, and
5612 traits that can be coerced to objects now must be [object
5614 * Automatically deriving traits is now done with `#[derive(...)]`
5615 not `#[deriving(...)]` for [consistency with other naming
5616 conventions][derive].
5617 * Importing the containing module or enum at the same time as
5618 items or variants they contain is [now done with `self` instead
5619 of `mod`][self], as in use `foo::{self, bar}`
5620 * Glob imports are no longer feature-gated.
5621 * The `box` operator and `box` patterns have been feature-gated
5622 pending a redesign. For now unique boxes should be allocated
5623 like other containers, with `Box::new`.
5627 * A [series][coll1] of [efforts][coll2] to establish
5628 [conventions][coll3] for collections types has resulted in API
5629 improvements throughout the standard library.
5630 * New [APIs for error handling][err] provide ergonomic interop
5631 between error types, and [new conventions][err-conv] describe
5632 more clearly the recommended error handling strategies in Rust.
5633 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5634 it is easier to discuss failure in the context of error handling
5635 without making clarifications as to whether you are referring to
5636 the 'fail' macro or failure more generally.
5637 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5638 syscall when available.
5639 * The 'serialize' crate has been renamed 'rustc-serialize' and
5640 moved out of the distribution to Cargo. Although it is widely
5641 used now, it is expected to be superseded in the near future.
5642 * The `Show` formatter, typically implemented with
5643 `#[derive(Show)]` is [now requested with the `{:?}`
5644 specifier][show] and is intended for use by all types, for uses
5645 such as `println!` debugging. The new `String` formatter must be
5646 implemented by hand, uses the `{}` specifier, and is intended
5647 for full-fidelity conversions of things that can logically be
5648 represented as strings.
5652 * [Flexible target specification][flex] allows rustc's code
5653 generation to be configured to support otherwise-unsupported
5655 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5656 respective debuggers with Rust-appropriate pretty-printing.
5657 * The Windows installation of Rust is distributed with the
5658 MinGW components currently required to link binaries on that
5663 * Nullable enum optimizations have been extended to more types so
5664 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5665 space than the inner types themselves.
5666 * Work has begun on supporting AArch64.
5668 [Cargo]: https://crates.io
5669 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5670 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5671 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5672 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5673 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5674 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5675 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5676 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5677 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5678 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5679 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5680 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5681 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5682 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5683 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5684 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5685 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5686 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5687 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5688 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5689 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5690 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5691 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5692 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5693 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5694 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5695 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5696 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5697 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5698 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5699 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5700 [trpl]: https://doc.rust-lang.org/book/index.html
5701 [rbe]: http://rustbyexample.com/
5704 Version 0.12.0 (2014-10-09)
5705 =============================
5707 * ~1900 changes, numerous bugfixes
5711 * The introductory documentation (now called The Rust Guide) has
5712 been completely rewritten, as have a number of supplementary
5714 * Rust's package manager, Cargo, continues to improve and is
5715 sometimes considered to be quite awesome.
5716 * Many API's in `std` have been reviewed and updated for
5717 consistency with the in-development Rust coding
5718 guidelines. The standard library documentation tracks
5719 stabilization progress.
5720 * Minor libraries have been moved out-of-tree to the rust-lang org
5721 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5722 be installed with Cargo.
5723 * Lifetime elision allows lifetime annotations to be left off of
5724 function declarations in many common scenarios.
5725 * Rust now works on 64-bit Windows.
5728 * Indexing can be overloaded with the `Index` and `IndexMut`
5730 * The `if let` construct takes a branch only if the `let` pattern
5731 matches, currently behind the 'if_let' feature gate.
5732 * 'where clauses', a more flexible syntax for specifying trait
5733 bounds that is more aesthetic, have been added for traits and
5734 free functions. Where clauses will in the future make it
5735 possible to constrain associated types, which would be
5736 impossible with the existing syntax.
5737 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5738 the 'slicing_syntax' feature gate, and can be overloaded with
5739 the `Slice` or `SliceMut` traits.
5740 * The syntax for matching of sub-slices has been changed to use a
5741 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5742 consistency with other uses of `..` and to future-proof
5743 potential additional uses of the syntax.
5744 * The syntax for matching inclusive ranges in patterns has changed
5745 from `0..3` to `0...4` to be consistent with the exclusive range
5747 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5748 c]`) has been put behind the 'advanced_slice_patterns' feature
5749 gate and may be removed in the future.
5750 * Components of tuples and tuple structs can be extracted using
5751 the `value.0` syntax, currently behind the `tuple_indexing`
5753 * The `#[crate_id]` attribute is no longer supported; versioning
5754 is handled by the package manager.
5755 * Renaming crate imports are now written `extern crate foo as bar`
5756 instead of `extern crate bar = foo`.
5757 * Renaming use statements are now written `use foo as bar` instead
5759 * `let` and `match` bindings and argument names in macros are now
5761 * The new, more efficient, closure types ('unboxed closures') have
5762 been added under a feature gate, 'unboxed_closures'. These will
5763 soon replace the existing closure types, once higher-ranked
5764 trait lifetimes are added to the language.
5765 * `move` has been added as a keyword, for indicating closures
5766 that capture by value.
5767 * Mutation and assignment is no longer allowed in pattern guards.
5768 * Generic structs and enums can now have trait bounds.
5769 * The `Share` trait is now called `Sync` to free up the term
5770 'shared' to refer to 'shared reference' (the default reference
5772 * Dynamically-sized types have been mostly implemented,
5773 unifying the behavior of fat-pointer types with the rest of the
5775 * As part of dynamically-sized types, the `Sized` trait has been
5776 introduced, which qualifying types implement by default, and
5777 which type parameters expect by default. To specify that a type
5778 parameter does not need to be sized, write `<Sized? T>`. Most
5779 types are `Sized`, notable exceptions being unsized arrays
5780 (`[T]`) and trait types.
5781 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5782 * Lifetime bounds can now be applied to type parameters and object
5784 * The old, reference counted GC type, `Gc<T>` which was once
5785 denoted by the `@` sigil, has finally been removed. GC will be
5786 revisited in the future.
5789 * Library documentation has been improved for a number of modules.
5790 * Bit-vectors, collections::bitv has been modernized.
5791 * The url crate is deprecated in favor of
5792 http://github.com/servo/rust-url, which can be installed with
5794 * Most I/O stream types can be cloned and subsequently closed from
5796 * A `std::time::Duration` type has been added for use in I/O
5797 methods that rely on timers, as well as in the 'time' crate's
5798 `Timespec` arithmetic.
5799 * The runtime I/O abstraction layer that enabled the green thread
5800 scheduler to do non-thread-blocking I/O has been removed, along
5801 with the libuv-based implementation employed by the green thread
5802 scheduler. This will greatly simplify the future I/O work.
5803 * `collections::btree` has been rewritten to have a more
5804 idiomatic and efficient design.
5807 * rustdoc output now indicates the stability levels of API's.
5808 * The `--crate-name` flag can specify the name of the crate
5809 being compiled, like `#[crate_name]`.
5810 * The `-C metadata` specifies additional metadata to hash into
5811 symbol names, and `-C extra-filename` specifies additional
5812 information to put into the output filename, for use by the
5813 package manager for versioning.
5814 * debug info generation has continued to improve and should be
5815 more reliable under both gdb and lldb.
5816 * rustc has experimental support for compiling in parallel
5817 using the `-C codegen-units` flag.
5818 * rustc no longer encodes rpath information into binaries by
5822 * Stack usage has been optimized with LLVM lifetime annotations.
5823 * Official Rust binaries on Linux are more compatible with older
5824 kernels and distributions, built on CentOS 5.10.
5827 Version 0.11.0 (2014-07-02)
5828 ==========================
5830 * ~1700 changes, numerous bugfixes
5833 * ~[T] has been removed from the language. This type is superseded by
5835 * ~str has been removed from the language. This type is superseded by
5837 * ~T has been removed from the language. This type is superseded by the
5839 * @T has been removed from the language. This type is superseded by the
5840 standard library's std::gc::Gc<T> type.
5841 * Struct fields are now all private by default.
5842 * Vector indices and shift amounts are both required to be a `uint`
5843 instead of any integral type.
5844 * Byte character, byte string, and raw byte string literals are now all
5845 supported by prefixing the normal literal with a `b`.
5846 * Multiple ABIs are no longer allowed in an ABI string
5847 * The syntax for lifetimes on closures/procedures has been tweaked
5848 slightly: `<'a>|A, B|: 'b + K -> T`
5849 * Floating point modulus has been removed from the language; however it
5850 is still provided by a library implementation.
5851 * Private enum variants are now disallowed.
5852 * The `priv` keyword has been removed from the language.
5853 * A closure can no longer be invoked through a &-pointer.
5854 * The `use foo, bar, baz;` syntax has been removed from the language.
5855 * The transmute intrinsic no longer works on type parameters.
5856 * Statics now allow blocks/items in their definition.
5857 * Trait bounds are separated from objects with + instead of : now.
5858 * Objects can no longer be read while they are mutably borrowed.
5859 * The address of a static is now marked as insignificant unless the
5860 #[inline(never)] attribute is placed it.
5861 * The #[unsafe_destructor] attribute is now behind a feature gate.
5862 * Struct literals are no longer allowed in ambiguous positions such as
5863 if, while, match, and for..in.
5864 * Declaration of lang items and intrinsics are now feature-gated by
5866 * Integral literals no longer default to `int`, and floating point
5867 literals no longer default to `f64`. Literals must be suffixed with an
5868 appropriate type if inference cannot determine the type of the
5870 * The Box<T> type is no longer implicitly borrowed to &mut T.
5871 * Procedures are now required to not capture borrowed references.
5874 * The standard library is now a "facade" over a number of underlying
5875 libraries. This means that development on the standard library should
5876 be speedier due to smaller crates, as well as a clearer line between
5878 * A new library, libcore, lives under the standard library's facade
5879 which is Rust's "0-assumption" library, suitable for embedded and
5880 kernel development for example.
5881 * A regex crate has been added to the standard distribution. This crate
5882 includes statically compiled regular expressions.
5883 * The unwrap/unwrap_err methods on Result require a Show bound for
5884 better error messages.
5885 * The return types of the std::comm primitives have been centralized
5886 around the Result type.
5887 * A number of I/O primitives have gained the ability to time out their
5889 * A number of I/O primitives have gained the ability to close their
5890 reading/writing halves to cancel pending operations.
5891 * Reverse iterator methods have been removed in favor of `rev()` on
5892 their forward-iteration counterparts.
5893 * A bitflags! macro has been added to enable easy interop with C and
5894 management of bit flags.
5895 * A debug_assert! macro is now provided which is disabled when
5896 `--cfg ndebug` is passed to the compiler.
5897 * A graphviz crate has been added for creating .dot files.
5898 * The std::cast module has been migrated into std::mem.
5899 * The std::local_data api has been migrated from freestanding functions
5900 to being based on methods.
5901 * The Pod trait has been renamed to Copy.
5902 * jemalloc has been added as the default allocator for types.
5903 * The API for allocating memory has been changed to use proper alignment
5904 and sized deallocation
5905 * Connecting a TcpStream or binding a TcpListener is now based on a
5906 string address and a u16 port. This allows connecting to a hostname as
5908 * The Reader trait now contains a core method, read_at_least(), which
5909 correctly handles many repeated 0-length reads.
5910 * The process-spawning API is now centered around a builder-style
5912 * The :? printing qualifier has been moved from the standard library to
5913 an external libdebug crate.
5914 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5915 have been renamed to Eq/Ord.
5916 * The select/plural methods have been removed from format!. The escapes
5917 for { and } have also changed from \{ and \} to {{ and }},
5919 * The TaskBuilder API has been re-worked to be a true builder, and
5920 extension traits for spawning native/green tasks have been added.
5923 * All breaking changes to the language or libraries now have their
5924 commit message annotated with `[breaking-change]` to allow for easy
5925 discovery of breaking changes.
5926 * The compiler will now try to suggest how to annotate lifetimes if a
5927 lifetime-related error occurs.
5928 * Debug info continues to be improved greatly with general bug fixes and
5929 better support for situations like link time optimization (LTO).
5930 * Usage of syntax extensions when cross-compiling has been fixed.
5931 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5932 -fdata-sections and --gc-sections has been enabled by default
5933 * The compiler is now stricter about where it will load module files
5934 from when a module is declared via `mod foo;`.
5935 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5936 Syntax extensions are now discovered via a "plugin registrar" type
5937 which will be extended in the future to other various plugins.
5938 * Lints have been restructured to allow for dynamically loadable lints.
5939 * A number of rustdoc improvements:
5940 * The HTML output has been visually redesigned.
5941 * Markdown is now powered by hoedown instead of sundown.
5942 * Searching heuristics have been greatly improved.
5943 * The search index has been reduced in size by a great amount.
5944 * Cross-crate documentation via `pub use` has been greatly improved.
5945 * Primitive types are now hyperlinked and documented.
5946 * Documentation has been moved from static.rust-lang.org/doc to
5948 * A new sandbox, play.rust-lang.org, is available for running and
5949 sharing rust code examples on-line.
5950 * Unused attributes are now more robustly warned about.
5951 * The dead_code lint now warns about unused struct fields.
5952 * Cross-compiling to iOS is now supported.
5953 * Cross-compiling to mipsel is now supported.
5954 * Stability attributes are now inherited by default and no longer apply
5955 to intra-crate usage, only inter-crate usage.
5956 * Error message related to non-exhaustive match expressions have been
5960 Version 0.10 (2014-04-03)
5961 =========================
5963 * ~1500 changes, numerous bugfixes
5966 * A new RFC process is now in place for modifying the language.
5967 * Patterns with `@`-pointers have been removed from the language.
5968 * Patterns with unique vectors (`~[T]`) have been removed from the
5970 * Patterns with unique strings (`~str`) have been removed from the
5972 * `@str` has been removed from the language.
5973 * `@[T]` has been removed from the language.
5974 * `@self` has been removed from the language.
5975 * `@Trait` has been removed from the language.
5976 * Headers on `~` allocations which contain `@` boxes inside the type for
5977 reference counting have been removed.
5978 * The semantics around the lifetimes of temporary expressions have changed,
5979 see #3511 and #11585 for more information.
5980 * Cross-crate syntax extensions are now possible, but feature gated. See
5981 #11151 for more information. This includes both `macro_rules!` macros as
5982 well as syntax extensions such as `format!`.
5983 * New lint modes have been added, and older ones have been turned on to be
5985 * Unnecessary parentheses
5988 * Uppercase variables
5989 * Publicly visible private types
5990 * `#[deriving]` with raw pointers
5991 * Unsafe functions can no longer be coerced to closures.
5992 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5993 * The `#[simd]` attribute is now behind a feature gate.
5994 * Visibility is no longer allowed on `extern crate` statements, and
5995 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5996 * Trailing commas are now allowed in argument lists and tuple patterns.
5997 * The `do` keyword has been removed, it is now a reserved keyword.
5998 * Default type parameters have been implemented, but are feature gated.
5999 * Borrowed variables through captures in closures are now considered soundly.
6000 * `extern mod` is now `extern crate`
6001 * The `Freeze` trait has been removed.
6002 * The `Share` trait has been added for types that can be shared among
6004 * Labels in macros are now hygienic.
6005 * Expression/statement macro invocations can be delimited with `{}` now.
6006 * Treatment of types allowed in `static mut` locations has been tweaked.
6007 * The `*` and `.` operators are now overloadable through the `Deref` and
6009 * `~Trait` and `proc` no longer have `Send` bounds by default.
6010 * Partial type hints are now supported with the `_` type marker.
6011 * An `Unsafe` type was introduced for interior mutability. It is now
6012 considered undefined to transmute from `&T` to `&mut T` without using the
6014 * The #[linkage] attribute was implemented for extern statics/functions.
6015 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6016 * `Pod` was renamed to `Copy`.
6019 * The `libextra` library has been removed. It has now been decomposed into
6020 component libraries with smaller and more focused nuggets of
6021 functionality. The full list of libraries can be found on the
6022 documentation index page.
6023 * std: `std::condition` has been removed. All I/O errors are now propagated
6024 through the `Result` type. In order to assist with error handling, a
6025 `try!` macro for unwrapping errors with an early return and a lint for
6026 unused results has been added. See #12039 for more information.
6027 * std: The `vec` module has been renamed to `slice`.
6028 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6029 This will become the only growable vector in the future.
6030 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6031 are now found at `std::io::BufferedReader` instead of
6032 `std::io::buffered::BufferedReader`.
6033 * std: `print` and `println` are no longer in the prelude, the `print!` and
6034 `println!` macros are intended to be used instead.
6035 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6036 attempts to statically prevent cycles.
6037 * std: The standard distribution is adopting the policy of pushing failure
6038 to the user rather than failing in libraries. Many functions (such as
6039 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6040 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6041 deriving mode: `#[deriving(Show)]`.
6042 * std: `ToStr` is now implemented for all types implementing `Show`.
6043 * std: The formatting trait methods now take `&self` instead of `&T`
6044 * std: The `invert()` method on iterators has been renamed to `rev()`
6045 * std: `std::num` has seen a reduction in the genericity of its traits,
6046 consolidating functionality into a few core traits.
6047 * std: Backtraces are now printed on task failure if the environment
6048 variable `RUST_BACKTRACE` is present.
6049 * std: Naming conventions for iterators have been standardized. More details
6050 can be found on the wiki's style guide.
6051 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6052 still implement the function.
6053 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6054 * std: `assert_approx_eq!` has been removed
6055 * std: The `e` and `E` formatting specifiers for floats have been added to
6056 print them in exponential notation.
6057 * std: The `Times` trait has been removed
6058 * std: Indications of variance and opting out of builtin bounds is done
6059 through marker types in `std::kinds::marker` now
6060 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6061 `#[deriving(Hash)]` is now possible.
6062 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6063 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6064 * std: `Chan::new` is now `channel()`.
6065 * std: A new synchronous channel type has been implemented.
6066 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6067 * std: `hashmap` and `trie` have been moved to `libcollections`
6068 * std: `run` has been rolled into `io::process`
6069 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6070 * std: The equality and comparison traits have seen some reorganization.
6071 * std: `rand` has moved to `librand`.
6072 * std: `to_{lower,upper}case` has been implemented for `char`.
6073 * std: Logging has been moved to `liblog`.
6074 * collections: `HashMap` has been rewritten for higher performance and less
6076 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6077 it can be booted manually. The runtime guide has more information and
6079 * native: All I/O functionality except signals has been implemented.
6080 * green: Task spawning with `libgreen` has been optimized with stack caching
6081 and various trimming of code.
6082 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6083 * sync: The `extra::sync` module has been updated to modern rust (and moved
6084 to the `sync` library), tweaking and improving various interfaces while
6085 dropping redundant functionality.
6086 * sync: A new `Barrier` type has been added to the `sync` library.
6087 * sync: An efficient mutex for native and green tasks has been implemented.
6088 * serialize: The `base64` module has seen some improvement. It treats
6089 newlines better, has non-string error values, and has seen general
6091 * fourcc: A `fourcc!` macro was introduced
6092 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6093 hexadecimal literal.
6096 * `rustpkg` has been deprecated and removed from the main repository. Its
6097 replacement, `cargo`, is under development.
6098 * Nightly builds of rust are now available
6099 * The memory usage of rustc has been improved many times throughout this
6101 * The build process supports disabling rpath support for the rustc binary
6103 * Code generation has improved in some cases, giving more information to the
6104 LLVM optimization passes to enable more extensive optimizations.
6105 * Debuginfo compatibility with lldb on OSX has been restored.
6106 * The master branch is now gated on an android bot, making building for
6107 android much more reliable.
6108 * Output flags have been centralized into one `--emit` flag.
6109 * Crate type flags have been centralized into one `--crate-type` flag.
6110 * Codegen flags have been consolidated behind a `-C` flag.
6111 * Linking against outdated crates now has improved error messages.
6112 * Error messages with lifetimes will often suggest how to annotate the
6113 function to fix the error.
6114 * Many more types are documented in the standard library, and new guides
6116 * Many `rustdoc` improvements:
6117 * code blocks are syntax highlighted.
6118 * render standalone markdown files.
6119 * the --test flag tests all code blocks by default.
6120 * exported macros are displayed.
6121 * re-exported types have their documentation inlined at the location of the
6123 * search works across crates that have been rendered to the same output
6127 Version 0.9 (2014-01-09)
6128 ==========================
6130 * ~1800 changes, numerous bugfixes
6133 * The `float` type has been removed. Use `f32` or `f64` instead.
6134 * A new facility for enabling experimental features (feature gating) has
6135 been added, using the crate-level `#[feature(foo)]` attribute.
6136 * Managed boxes (@) are now behind a feature gate
6137 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6138 standard library's `Gc` or `Rc` types instead.
6139 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6140 * Jumping back to the top of a loop is now done with `continue` instead of
6142 * Strings can no longer be mutated through index assignment.
6143 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6144 hash delimiters, as in `r###"foo"###`.
6145 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6147 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6148 * `@fn`s have been removed.
6149 * `do` only works with procs in order to make it obvious what the cost
6151 * Single-element tuple-like structs can no longer be dereferenced to
6152 obtain the inner value. A more comprehensive solution for overloading
6153 the dereference operator will be provided in the future.
6154 * The `#[link(...)]` attribute has been replaced with
6155 `#[crate_id = "name#vers"]`.
6156 * Empty `impl`s must be terminated with empty braces and may not be
6157 terminated with a semicolon.
6158 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6159 no longer has any special meaning.
6160 * The old `fmt!` string formatting macro has been removed.
6161 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6162 `print!` and `println!`.
6163 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6164 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6165 `extern mod foo = "bar"` instead.
6166 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6167 * Macros can have attributes.
6168 * Macros can expand to items with attributes.
6169 * Macros can expand to multiple items.
6170 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6171 * Comments may be nested.
6172 * Values automatically coerce to trait objects they implement, without
6174 * Enum discriminants are no longer an entire word but as small as needed to
6175 contain all the variants. The `repr` attribute can be used to override
6176 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6177 `#[repr(C)]` to match C enums.
6178 * Non-string literals are not allowed in attributes (they never worked).
6179 * The FFI now supports variadic functions.
6180 * Octal numeric literals, as in `0o7777`.
6181 * The `concat!` syntax extension performs compile-time string concatenation.
6182 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6183 removed as Rust no longer uses segmented stacks.
6184 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6185 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6186 not `*`; ignoring remaining fields of a struct is also done with `..`,
6187 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6188 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6189 * `rustc` supports the "system" calling convention, which defaults to the
6190 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6192 * The `type_overflow` lint (default: warn) checks literals for overflow.
6193 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6194 * The `attribute_usage` lint (default: warn) warns about unknown
6196 * The `unknown_features` lint (default: warn) warns about unknown
6198 * The `dead_code` lint (default: warn) checks for dead code.
6199 * Rust libraries can be linked statically to one another
6200 * `#[link_args]` is behind the `link_args` feature gate.
6201 * Native libraries are now linked with `#[link(name = "foo")]`
6202 * Native libraries can be statically linked to a rust crate
6203 (`#[link(name = "foo", kind = "static")]`).
6204 * Native OS X frameworks are now officially supported
6205 (`#[link(name = "foo", kind = "framework")]`).
6206 * The `#[thread_local]` attribute creates thread-local (not task-local)
6207 variables. Currently behind the `thread_local` feature gate.
6208 * The `return` keyword may be used in closures.
6209 * Types that can be copied via a memcpy implement the `Pod` kind.
6210 * The `cfg` attribute can now be used on struct fields and enum variants.
6213 * std: The `option` and `result` API's have been overhauled to make them
6214 simpler, more consistent, and more composable.
6215 * std: The entire `std::io` module has been replaced with one that is
6216 more comprehensive and that properly interfaces with the underlying
6217 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6219 * std: `io::util` contains a number of useful implementations of
6220 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6221 `ZeroReader`, `TeeReader`.
6222 * std: The reference counted pointer type `extra::rc` moved into std.
6223 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6224 just a wrapper around it).
6225 * std: The `Either` type has been removed.
6226 * std: `fmt::Default` can be implemented for any type to provide default
6227 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6228 * std: The `rand` API continues to be tweaked.
6229 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6230 on failure in gdb, is now named `rust_fail`.
6231 * std: The `each_key` and `each_value` methods on `HashMap` have been
6232 replaced by the `keys` and `values` iterators.
6233 * std: Functions dealing with type size and alignment have moved from the
6234 `sys` module to the `mem` module.
6235 * std: The `path` module was written and API changed.
6236 * std: `str::from_utf8` has been changed to cast instead of allocate.
6237 * std: `starts_with` and `ends_with` methods added to vectors via the
6238 `ImmutableEqVector` trait, which is in the prelude.
6239 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6240 if the index is out of bounds.
6241 * std: Task failure no longer propagates between tasks, as the model was
6242 complex, expensive, and incompatible with thread-based tasks.
6243 * std: The `Any` type can be used for dynamic typing.
6244 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6246 * std: Methods that produce iterators generally do not have an `_iter`
6248 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6249 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6250 * std: `util::ignore` renamed to `prelude::drop`.
6251 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6253 * std: `vec::raw` has seen a lot of cleanup and API changes.
6254 * std: The standard library no longer includes any C++ code, and very
6255 minimal C, eliminating the dependency on libstdc++.
6256 * std: Runtime scheduling and I/O functionality has been factored out into
6257 extensible interfaces and is now implemented by two different crates:
6258 libnative, for native threading and I/O; and libgreen, for green threading
6259 and I/O. This paves the way for using the standard library in more limited
6260 embedded environments.
6261 * std: The `comm` module has been rewritten to be much faster, have a
6262 simpler, more consistent API, and to work for both native and green
6264 * std: All libuv dependencies have been moved into the rustuv crate.
6265 * native: New implementations of runtime scheduling on top of OS threads.
6266 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6268 * green: The green thread scheduler and message passing types are almost
6270 * extra: The `flatpipes` module had bitrotted and was removed.
6271 * extra: All crypto functions have been removed and Rust now has a policy of
6272 not reimplementing crypto in the standard library. In the future crypto
6273 will be provided by external crates with bindings to established libraries.
6274 * extra: `c_vec` has been modernized.
6275 * extra: The `sort` module has been removed. Use the `sort` method on
6279 * The `rust` and `rusti` commands have been removed, due to lack of
6281 * `rustdoc` was completely rewritten.
6282 * `rustdoc` can test code examples in documentation.
6283 * `rustpkg` can test packages with the argument, 'test'.
6284 * `rustpkg` supports arbitrary dependencies, including C libraries.
6285 * `rustc`'s support for generating debug info is improved again.
6286 * `rustc` has better error reporting for unbalanced delimiters.
6287 * `rustc`'s JIT support was removed due to bitrot.
6288 * Executables and static libraries can be built with LTO (-Z lto)
6289 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6293 Version 0.8 (2013-09-26)
6294 ============================
6296 * ~2200 changes, numerous bugfixes
6299 * The `for` loop syntax has changed to work with the `Iterator` trait.
6300 * At long last, unwinding works on Windows.
6301 * Default methods are ready for use.
6302 * Many trait inheritance bugs fixed.
6303 * Owned and borrowed trait objects work more reliably.
6304 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6305 * rustc can omit emission of code for the `debug!` macro if it is passed
6307 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6308 for foo.rs, then foo/mod.rs, and will generate an error when both are
6310 * Strings no longer contain trailing nulls. The new `std::c_str` module
6311 provides new mechanisms for converting to C strings.
6312 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6313 * The FFI has been overhauled such that foreign functions are called directly,
6314 instead of through a stack-switching wrapper.
6315 * Calling a foreign function must be done through a Rust function with the
6316 `#[fixed_stack_segment]` attribute.
6317 * The `externfn!` macro can be used to declare both a foreign function and
6318 a `#[fixed_stack_segment]` wrapper at once.
6319 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6320 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6321 * `priv` is disallowed everywhere except for struct fields and enum variants.
6322 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6323 * `ref` bindings in irrefutable patterns work correctly now.
6324 * `char` is now prevented from containing invalid code points.
6325 * Casting to `bool` is no longer allowed.
6326 * `\0` is now accepted as an escape in chars and strings.
6327 * `yield` is a reserved keyword.
6328 * `typeof` is a reserved keyword.
6329 * Crates may be imported by URL with `extern mod foo = "url";`.
6330 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6331 * Static vectors can be initialized with repeating elements,
6332 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6333 * Static structs can be initialized with functional record update,
6334 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6335 * `cfg!` can be used to conditionally execute code based on the crate
6336 configuration, similarly to `#[cfg(...)]`.
6337 * The `unnecessary_qualification` lint detects unneeded module
6338 prefixes (default: allow).
6339 * Arithmetic operations have been implemented on the SIMD types in
6340 `std::unstable::simd`.
6341 * Exchange allocation headers were removed, reducing memory usage.
6342 * `format!` implements a completely new, extensible, and higher-performance
6343 string formatting system. It will replace `fmt!`.
6344 * `print!` and `println!` write formatted strings (using the `format!`
6345 extension) to stdout.
6346 * `write!` and `writeln!` write formatted strings (using the `format!`
6347 extension) to the new Writers in `std::rt::io`.
6348 * The library section in which a function or static is placed may
6349 be specified with `#[link_section = "..."]`.
6350 * The `proto!` syntax extension for defining bounded message protocols
6352 * `macro_rules!` is hygienic for `let` declarations.
6353 * The `#[export_name]` attribute specifies the name of a symbol.
6354 * `unreachable!` can be used to indicate unreachable code, and fails
6358 * std: Transitioned to the new runtime, written in Rust.
6359 * std: Added an experimental I/O library, `rt::io`, based on the new
6361 * std: A new generic `range` function was added to the prelude, replacing
6362 `uint::range` and friends.
6363 * std: `range_rev` no longer exists. Since range is an iterator it can be
6364 reversed with `range(lo, hi).invert()`.
6365 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6366 renamed to `unwrap_or`.
6367 * std: The `iterator` module was renamed to `iter`.
6368 * std: Integral types now support the `checked_add`, `checked_sub`, and
6369 `checked_mul` operations for detecting overflow.
6370 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6372 * std: Methods are standardizing on conventions for casting methods:
6373 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6375 * std: The `CString` type in `c_str` provides new ways to convert to and
6377 * std: `DoubleEndedIterator` can yield elements in two directions.
6378 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6380 * std: `str::from_bytes` renamed to `str::from_utf8`.
6381 * std: `pop_opt` and `shift_opt` methods added to vectors.
6382 * std: The task-local data interface no longer uses @, and keys are
6383 no longer function pointers.
6384 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6385 * std: Added `SharedPort` to `comm`.
6386 * std: `Eq` has a default method for `ne`; only `eq` is required
6388 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6389 is required in implementations.
6390 * std: `is_utf8` performance is improved, impacting many string functions.
6391 * std: `os::MemoryMap` provides cross-platform mmap.
6392 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6393 are not 'in-bounds' are considered undefined.
6394 * std: Many freestanding functions in `vec` removed in favor of methods.
6395 * std: Many freestanding functions on scalar types removed in favor of
6397 * std: Many options to task builders were removed since they don't make
6398 sense in the new scheduler design.
6399 * std: More containers implement `FromIterator` so can be created by the
6401 * std: More complete atomic types in `unstable::atomics`.
6402 * std: `comm::PortSet` removed.
6403 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6404 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6405 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6406 default implementations.
6407 * std: Various `from_str` functions were removed in favor of a generic
6408 `from_str` which is available in the prelude.
6409 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6410 * extra: `dlist`, the doubly-linked list was modernized.
6411 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6412 * extra: Added `glob` module, replacing `std::os::glob`.
6413 * extra: `rope` was removed.
6414 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6415 * extra: `net`, and `timer` were removed. The experimental replacements
6416 are `std::rt::io::net` and `std::rt::io::timer`.
6417 * extra: Iterators implemented for `SmallIntMap`.
6418 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6419 * extra: `SmallIntSet` removed. Use `BitvSet`.
6420 * extra: Performance of JSON parsing greatly improved.
6421 * extra: `semver` updated to SemVer 2.0.0.
6422 * extra: `term` handles more terminals correctly.
6423 * extra: `dbg` module removed.
6424 * extra: `par` module removed.
6425 * extra: `future` was cleaned up, with some method renames.
6426 * extra: Most free functions in `getopts` were converted to methods.
6429 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6430 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6431 similarly to gcc's `--march` flag.
6432 * rustc's performance compiling small crates is much better.
6433 * rustpkg has received many improvements.
6434 * rustpkg supports git tags as package IDs.
6435 * rustpkg builds into target-specific directories so it can be used for
6437 * The number of concurrent test tasks is controlled by the environment
6438 variable RUST_TEST_TASKS.
6439 * The test harness can now report metrics for benchmarks.
6440 * All tools have man pages.
6441 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6442 * The runtime uses jemalloc for allocations.
6443 * Segmented stacks are temporarily disabled as part of the transition to
6444 the new runtime. Stack overflows are possible!
6445 * A new documentation backend, rustdoc_ng, is available for use. It is
6446 still invoked through the normal `rustdoc` command.
6449 Version 0.7 (2013-07-03)
6450 =======================
6452 * ~2000 changes, numerous bugfixes
6455 * `impl`s no longer accept a visibility qualifier. Put them on methods
6457 * The borrow checker has been rewritten with flow-sensitivity, fixing
6458 many bugs and inconveniences.
6459 * The `self` parameter no longer implicitly means `&'self self`,
6460 and can be explicitly marked with a lifetime.
6461 * Overloadable compound operators (`+=`, etc.) have been temporarily
6462 removed due to bugs.
6463 * The `for` loop protocol now requires `for`-iterators to return `bool`
6464 so they compose better.
6465 * The `Durable` trait is replaced with the `'static` bounds.
6466 * Trait default methods work more often.
6467 * Structs with the `#[packed]` attribute have byte alignment and
6468 no padding between fields.
6469 * Type parameters bound by `Copy` must now be copied explicitly with
6471 * It is now illegal to move out of a dereferenced unsafe pointer.
6472 * `Option<~T>` is now represented as a nullable pointer.
6473 * `@mut` does dynamic borrow checks correctly.
6474 * The `main` function is only detected at the topmost level of the crate.
6475 The `#[main]` attribute is still valid anywhere.
6476 * Struct fields may no longer be mutable. Use inherited mutability.
6477 * The `#[no_send]` attribute makes a type that would otherwise be
6479 * The `#[no_freeze]` attribute makes a type that would otherwise be
6481 * Unbounded recursion will abort the process after reaching the limit
6482 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6483 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6484 are never implicitly copyable.
6485 * `#[static_assert]` makes compile-time assertions about static bools.
6486 * At long last, 'argument modes' no longer exist.
6487 * The rarely used `use mod` statement no longer exists.
6490 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6492 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6493 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6495 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6496 and unsuffixed integer literals.
6499 * The `core` crate was renamed to `std`.
6500 * The `std` crate was renamed to `extra`.
6501 * More and improved documentation.
6502 * std: `iterator` module for external iterator objects.
6503 * Many old-style (internal, higher-order function) iterators replaced by
6504 implementations of `Iterator`.
6505 * std: Many old internal vector and string iterators,
6506 incl. `any`, `all`. removed.
6507 * std: The `finalize` method of `Drop` renamed to `drop`.
6508 * std: The `drop` method now takes `&mut self` instead of `&self`.
6509 * std: The prelude no longer re-exports any modules, only types and traits.
6510 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6511 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6512 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6513 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6514 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6515 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6516 * std: Many types implement `Clone`.
6517 * std: `path` type renamed to `Path`.
6518 * std: `mut` module and `Mut` type removed.
6519 * std: Many standalone functions removed in favor of methods and iterators
6520 in `vec`, `str`. In the future methods will also work as functions.
6521 * std: `reinterpret_cast` removed. Use `transmute`.
6522 * std: ascii string handling in `std::ascii`.
6523 * std: `Rand` is implemented for ~/@.
6524 * std: `run` module for spawning processes overhauled.
6525 * std: Various atomic types added to `unstable::atomic`.
6526 * std: Various types implement `Zero`.
6527 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6528 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6529 * std: Added `os::mkdir_recursive`.
6530 * std: Added `os::glob` function performs filesystems globs.
6531 * std: `FuzzyEq` renamed to `ApproxEq`.
6532 * std: `Map` now defines `pop` and `swap` methods.
6533 * std: `Cell` constructors converted to static methods.
6534 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6535 * extra: `flate` module moved from `std` to `extra`.
6536 * extra: `fileinput` module for iterating over a series of files.
6537 * extra: `Complex` number type and `complex` module.
6538 * extra: `Rational` number type and `rational` module.
6539 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6540 * extra: `term` uses terminfo now, is more correct.
6541 * extra: `arc` functions converted to methods.
6542 * extra: Implementation of fixed output size variations of SHA-2.
6545 * `unused_variable` lint mode for unused variables (default: warn).
6546 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6548 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6550 * `dead_assignment` lint mode for unread variables (default: warn).
6551 * `unnecessary_allocation` lint mode detects some heap allocations that are
6552 immediately borrowed so could be written without allocating (default: warn).
6553 * `missing_doc` lint mode (default: allow).
6554 * `unreachable_code` lint mode (default: warn).
6555 * The `rusti` command has been rewritten and a number of bugs addressed.
6556 * rustc outputs in color on more terminals.
6557 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6558 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6559 * Compiling with `-g` will make the binary record information about
6560 dynamic borrowcheck failures for debugging.
6561 * rustdoc has a nicer stylesheet.
6562 * Various improvements to rustdoc.
6563 * Improvements to rustpkg (see the detailed release notes).
6566 Version 0.6 (2013-04-03)
6567 ========================
6569 * ~2100 changes, numerous bugfixes
6572 * The self type parameter in traits is now spelled `Self`
6573 * The `self` parameter in trait and impl methods must now be explicitly
6574 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6575 * Static methods no longer require the `static` keyword and instead
6576 are distinguished by the lack of a `self` parameter
6577 * Replaced the `Durable` trait with the `'static` lifetime
6578 * The old closure type syntax with the trailing sigil has been
6579 removed in favor of the more consistent leading sigil
6580 * `super` is a keyword, and may be prefixed to paths
6581 * Trait bounds are separated with `+` instead of whitespace
6582 * Traits are implemented with `impl Trait for Type`
6583 instead of `impl Type: Trait`
6584 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6585 * The `export` keyword has finally been removed
6586 * The `move` keyword has been removed (see "Semantic changes")
6587 * The interior mutability qualifier on vectors, `[mut T]`, has been
6588 removed. Use `&mut [T]`, etc.
6589 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6590 * `fail` is no longer a keyword. Use `fail!()`
6591 * `assert` is no longer a keyword. Use `assert!()`
6592 * `log` is no longer a keyword. use `debug!`, etc.
6593 * 1-tuples may be represented as `(T,)`
6594 * Struct fields may no longer be `mut`. Use inherited mutability,
6595 `@mut T`, `core::mut` or `core::cell`
6596 * `extern mod { ... }` is no longer valid syntax for foreign
6597 function modules. Use extern blocks: `extern { ... }`
6598 * Newtype enums removed. Use tuple-structs.
6599 * Trait implementations no longer support visibility modifiers
6600 * Pattern matching over vectors improved and expanded
6601 * `const` renamed to `static` to correspond to lifetime name,
6602 and make room for future `static mut` unsafe mutable globals.
6603 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6604 * `Clone` implementations can be automatically generated with
6605 `#[deriving(Clone)]`
6606 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6607 instead of `foo as Bar`.
6608 * Fixed length vector types are now written as `[int, .. 3]`
6609 instead of `[int * 3]`.
6610 * Fixed length vector types can express the length as a constant
6611 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6614 * Types with owned pointers or custom destructors move by default,
6615 eliminating the `move` keyword
6616 * All foreign functions are considered unsafe
6617 * &mut is now unaliasable
6618 * Writes to borrowed @mut pointers are prevented dynamically
6620 * The name of the main function can be customized using #[main]
6621 * The default type of an inferred closure is &fn instead of @fn
6622 * `use` statements may no longer be "chained" - they cannot import
6623 identifiers imported by previous `use` statements
6624 * `use` statements are crate relative, importing from the "top"
6625 of the crate by default. Paths may be prefixed with `super::`
6626 or `self::` to change the search behavior.
6627 * Method visibility is inherited from the implementation declaration
6628 * Structural records have been removed
6629 * Many more types can be used in static items, including enums
6630 'static-lifetime pointers and vectors
6631 * Pattern matching over vectors improved and expanded
6632 * Typechecking of closure types has been overhauled to
6633 improve inference and eliminate unsoundness
6634 * Macros leave scope at the end of modules, unless that module is
6635 tagged with #[macro_escape]
6638 * Added big integers to `std::bigint`
6639 * Removed `core::oldcomm` module
6640 * Added pipe-based `core::comm` module
6641 * Numeric traits have been reorganized under `core::num`
6642 * `vec::slice` finally returns a slice
6643 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6644 * Containers reorganized around traits in `core::container`
6645 * `core::dvec` removed, `~[T]` is a drop-in replacement
6646 * `core::send_map` renamed to `core::hashmap`
6647 * `std::map` removed; replaced with `core::hashmap`
6648 * `std::treemap` reimplemented as an owned balanced tree
6649 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6650 * `core::trie` added as a fast ordered map for integer keys
6651 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6652 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6653 overload the comparison operators, whereas `TotalOrd` is used
6654 by certain container types
6657 * Replaced the 'cargo' package manager with 'rustpkg'
6658 * Added all-purpose 'rust' tool
6659 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6660 * rustc now *attempts* to offer spelling suggestions
6661 * Improved support for ARM and Android
6662 * Preliminary MIPS backend
6663 * Improved foreign function ABI implementation for x86, x86_64
6664 * Various memory usage improvements
6665 * Rust code may be embedded in foreign code under limited circumstances
6666 * Inline assembler supported by new asm!() syntax extension.
6669 Version 0.5 (2012-12-21)
6670 ===========================
6672 * ~900 changes, numerous bugfixes
6675 * Removed `<-` move operator
6676 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6677 * Removed old fixed length vector syntax - `[T]/N`
6678 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6679 * Macros may now expand to items and statements
6680 * `a.b()` is always parsed as a method call, never as a field projection
6681 * `Eq` and `IterBytes` implementations can be automatically generated
6682 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6683 * Removed the special crate language for `.rc` files
6684 * Function arguments may consist of any irrefutable pattern
6687 * `&` and `~` pointers may point to objects
6688 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6689 * Enum variants may be structs
6690 * Destructors can be added to all nominal types with the Drop trait
6691 * Structs and nullary enum variants may be constants
6692 * Values that cannot be implicitly copied are now automatically moved
6693 without writing `move` explicitly
6694 * `&T` may now be coerced to `*T`
6695 * Coercions happen in `let` statements as well as function calls
6696 * `use` statements now take crate-relative paths
6697 * The module and type namespaces have been merged so that static
6698 method names can be resolved under the trait in which they are
6701 * Improved support for language features
6702 * Trait inheritance works in many scenarios
6703 * More support for explicit self arguments in methods - `self`, `&self`
6704 `@self`, and `~self` all generally work as expected
6705 * Static methods work in more situations
6706 * Experimental: Traits may declare default methods for the implementations
6710 * New condition handling system in `core::condition`
6711 * Timsort added to `std::sort`
6712 * New priority queue, `std::priority_queue`
6713 * Pipes for serializable types, `std::flatpipes'
6714 * Serialization overhauled to be trait-based
6715 * Expanded `getopts` definitions
6716 * Moved futures to `std`
6717 * More functions are pure now
6718 * `core::comm` renamed to `oldcomm`. Still deprecated
6719 * `rustdoc` and `cargo` are libraries now
6722 * Added a preliminary REPL, `rusti`
6723 * License changed from MIT to dual MIT/APL2
6726 Version 0.4 (2012-10-15)
6727 ==========================
6729 * ~2000 changes, numerous bugfixes
6732 * All keywords are now strict and may not be used as identifiers anywhere
6733 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6734 'of', 'with', 'to', 'class'.
6735 * Classes are replaced with simpler structs
6736 * Explicit method self types
6737 * `ret` became `return` and `alt` became `match`
6738 * `import` is now `use`; `use is now `extern mod`
6739 * `extern mod { ... }` is now `extern { ... }`
6740 * `use mod` is the recommended way to import modules
6741 * `pub` and `priv` replace deprecated export lists
6742 * The syntax of `match` pattern arms now uses fat arrow (=>)
6743 * `main` no longer accepts an args vector; use `os::args` instead
6746 * Trait implementations are now coherent, ala Haskell typeclasses
6747 * Trait methods may be static
6748 * Argument modes are deprecated
6749 * Borrowed pointers are much more mature and recommended for use
6750 * Strings and vectors in the static region are stored in constant memory
6751 * Typestate was removed
6752 * Resolution rewritten to be more reliable
6753 * Support for 'dual-mode' data structures (freezing and thawing)
6756 * Most binary operators can now be overloaded via the traits in
6758 * `std::net::url` for representing URLs
6759 * Sendable hash maps in `core::send_map`
6760 * `core::task' gained a (currently unsafe) task-local storage API
6763 * An efficient new intertask communication primitive called the pipe,
6764 along with a number of higher-level channel types, in `core::pipes`
6765 * `std::arc`, an atomically reference counted, immutable, shared memory
6767 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6768 * Futures are now based on pipes and sendable
6769 * More robust linked task failure
6770 * Improved task builder API
6773 * Improved error reporting
6774 * Preliminary JIT support
6775 * Preliminary work on precise GC
6776 * Extensive architectural improvements to rustc
6777 * Begun a transition away from buggy C++-based reflection (shape) code to
6778 Rust-based (visitor) code
6779 * All hash functions and tables converted to secure, randomized SipHash
6782 Version 0.3 (2012-07-12)
6783 ========================
6785 * ~1900 changes, numerous bugfixes
6787 * New coding conveniences
6788 * Integer-literal suffix inference
6789 * Per-item control over warnings, errors
6790 * #[cfg(windows)] and #[cfg(unix)] attributes
6791 * Documentation comments
6792 * More compact closure syntax
6793 * 'do' expressions for treating higher-order functions as
6795 * *-patterns (wildcard extended to all constructor fields)
6798 * Name resolution pass and exhaustiveness checker rewritten
6799 * Region pointers and borrow checking supersede alias
6801 * Init-ness checking is now provided by a region-based liveness
6802 pass instead of the typestate pass; same for last-use analysis
6803 * Extensive work on region pointers
6805 * Experimental new language features
6806 * Slices and fixed-size, interior-allocated vectors
6807 * #!-comments for lang versioning, shell execution
6808 * Destructors and iface implementation for classes;
6809 type-parameterized classes and class methods
6810 * 'const' type kind for types that can be used to implement
6811 shared-memory concurrency patterns
6815 * Removal of various obsolete features
6816 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6817 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6819 * Constructs: do-while loops ('do' repurposed), fn binding,
6820 resources (replaced by destructors)
6822 * Compiler reorganization
6823 * Syntax-layer of compiler split into separate crate
6824 * Clang (from LLVM project) integrated into build
6825 * Typechecker split into sub-modules
6828 * New time functions
6829 * Extension methods for many built-in types
6830 * Arc: atomic-refcount read-only / exclusive-use shared cells
6831 * Par: parallel map and search routines
6832 * Extensive work on libuv interface
6833 * Much vector code moved to libraries
6834 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6835 #include, #include_str, #include_bin
6838 * Cargo automatically resolves dependencies
6841 Version 0.2 (2012-03-29)
6842 =========================
6844 * >1500 changes, numerous bugfixes
6846 * New docs and doc tooling
6848 * New port: FreeBSD x86_64
6850 * Compilation model enhancements
6851 * Generics now specialized, multiply instantiated
6852 * Functions now inlined across separate crates
6854 * Scheduling, stack and threading fixes
6855 * Noticeably improved message-passing performance
6856 * Explicit schedulers
6860 * Experimental new language features
6861 * Operator overloading
6865 * Various language extensions
6866 * C-callback function types: 'crust fn ...'
6867 * Infinite-loop construct: 'loop { ... }'
6868 * Shorten 'mutable' to 'mut'
6869 * Required mutable-local qualifier: 'let mut ...'
6870 * Basic glob-exporting: 'export foo::*;'
6871 * Alt now exhaustive, 'alt check' for runtime-checked
6872 * Block-function form of 'for' loop, with 'break' and 'ret'.
6875 * AST quasi-quote syntax extension
6876 * Revived libuv interface
6877 * New modules: core::{future, iter}, std::arena
6878 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6879 * Extensive cleanup, regularization in libstd, libcore
6882 Version 0.1 (2012-01-20)
6883 ===============================
6885 * Most language features work, including:
6886 * Unique pointers, unique closures, move semantics
6887 * Interface-constrained generics
6888 * Static interface dispatch
6890 * Multithread task scheduling
6891 * Typestate predicates
6892 * Failure unwinding, destructors
6893 * Pattern matching and destructuring assignment
6894 * Lightweight block-lambda syntax
6895 * Preliminary macro-by-example
6897 * Compiler works with the following configurations:
6898 * Linux: x86 and x86_64 hosts and targets
6899 * macOS: x86 and x86_64 hosts and targets
6900 * Windows: x86 hosts and targets
6902 * Cross compilation / multi-target configuration supported.
6904 * Preliminary API-documentation and package-management tools included.
6908 * Documentation is incomplete.
6910 * Performance is below intended target.
6912 * Standard library APIs are subject to extensive change, reorganization.
6914 * Language-level versioning is not yet operational - future code will