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 - [Cargo will now provide a progress bar for builds.][cargo/5995]
71 - [`rustdoc` allows you to specify what edition to treat your code as with the
72 `--edition` option.][54057]
73 - [`rustdoc` now has the `--color` (specify whether to output color) and
74 `--error-format` (specify error format, e.g. `json`) options.][53003]
75 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
76 debug symbols.][53774]
77 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
78 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
80 [50911]: https://github.com/rust-lang/rust/pull/50911/
81 [51363]: https://github.com/rust-lang/rust/pull/51363/
82 [51366]: https://github.com/rust-lang/rust/pull/51366/
83 [52081]: https://github.com/rust-lang/rust/pull/52081/
84 [53003]: https://github.com/rust-lang/rust/pull/53003/
85 [53033]: https://github.com/rust-lang/rust/pull/53033/
86 [53044]: https://github.com/rust-lang/rust/pull/53044/
87 [53165]: https://github.com/rust-lang/rust/pull/53165/
88 [53213]: https://github.com/rust-lang/rust/pull/53213/
89 [53236]: https://github.com/rust-lang/rust/pull/53236/
90 [53272]: https://github.com/rust-lang/rust/pull/53272/
91 [53370]: https://github.com/rust-lang/rust/pull/53370/
92 [53459]: https://github.com/rust-lang/rust/pull/53459/
93 [53774]: https://github.com/rust-lang/rust/pull/53774/
94 [53822]: https://github.com/rust-lang/rust/pull/53822/
95 [54057]: https://github.com/rust-lang/rust/pull/54057/
96 [54146]: https://github.com/rust-lang/rust/pull/54146/
97 [54404]: https://github.com/rust-lang/rust/pull/54404/
98 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
99 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
100 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
101 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
103 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
104 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
105 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
106 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
107 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
108 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
109 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
110 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
111 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
112 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
115 Version 1.29.2 (2018-10-11)
116 ===========================
118 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
119 - The `rls-preview` component on the windows-gnu targets has been restored.
121 [54639]: https://github.com/rust-lang/rust/pull/54639
124 Version 1.29.1 (2018-09-25)
125 ===========================
130 - The standard library's `str::repeat` function contained an out of bounds write
131 caused by an integer overflow. This has been fixed by deterministically
132 panicking when an overflow happens.
134 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
138 Version 1.29.0 (2018-09-13)
139 ==========================
143 - [Bumped minimum LLVM version to 5.0.][51899]
144 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
145 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
149 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
150 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
151 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
152 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
154 - [`Cell<T>` now allows `T` to be unsized.][50494]
155 - [`SocketAddr` is now stable on Redox.][52656]
160 - [`Iterator::flatten`]
165 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
166 `--locked` to disable this behavior.
167 - [`cargo-install` will now allow you to cross compile an install
168 using `--target`.][cargo/5614]
169 - [Added the `cargo-fix` subcommand to automatically move project code from
170 2015 edition to 2018.][cargo/5723]
171 - [`cargo doc` can now optionally document private types using the
172 `--document-private-items` flag.][cargo/5543]
176 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
177 the specified level to that level.][52354] For example `--cap-lints warn`
178 will demote `deny` and `forbid` lints to `warn`.
179 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
180 fails and `101` if there is a panic.][52197]
181 - [A preview of clippy has been made available through rustup.][51122]
182 You can install the preview with `rustup component add clippy-preview`.
186 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
187 Use `str::get_unchecked(begin..end)` instead.
188 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
189 Consider using the `home_dir` function from
190 https://crates.io/crates/dirs instead.
191 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
192 - [`cfg` attributes and `--cfg` command line flags are now more
193 strictly validated.][53893]
195 [53893]: https://github.com/rust-lang/rust/pull/53893/
196 [52861]: https://github.com/rust-lang/rust/pull/52861/
197 [52656]: https://github.com/rust-lang/rust/pull/52656/
198 [52239]: https://github.com/rust-lang/rust/pull/52239/
199 [52330]: https://github.com/rust-lang/rust/pull/52330/
200 [52354]: https://github.com/rust-lang/rust/pull/52354/
201 [52402]: https://github.com/rust-lang/rust/pull/52402/
202 [52103]: https://github.com/rust-lang/rust/pull/52103/
203 [52197]: https://github.com/rust-lang/rust/pull/52197/
204 [51807]: https://github.com/rust-lang/rust/pull/51807/
205 [51899]: https://github.com/rust-lang/rust/pull/51899/
206 [51912]: https://github.com/rust-lang/rust/pull/51912/
207 [51511]: https://github.com/rust-lang/rust/pull/51511/
208 [51619]: https://github.com/rust-lang/rust/pull/51619/
209 [51656]: https://github.com/rust-lang/rust/pull/51656/
210 [51178]: https://github.com/rust-lang/rust/pull/51178/
211 [51122]: https://github.com/rust-lang/rust/pull/51122
212 [50494]: https://github.com/rust-lang/rust/pull/50494/
213 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
214 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
215 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
216 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
217 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
218 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
219 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
222 Version 1.28.0 (2018-08-02)
223 ===========================
227 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
228 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
229 the inner type across Foreign Function Interface (FFI) boundaries.
230 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
231 and can now be used as identifiers.][51196]
232 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
233 stable.][51241] This will allow users to specify a global allocator for
235 - [Unit test functions marked with the `#[test]` attribute can now return
236 `Result<(), E: Debug>` in addition to `()`.][51298]
237 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
238 allows macros to easily target lifetimes.
242 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
243 prioritise making smaller binary sizes. `z` is the same as `s` with the
244 exception that it does not vectorise loops, which typically results in an even
246 - [The short error format is now stable.][49546] Specified with
247 `--error-format=short` this option will provide a more compressed output of
249 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
250 - [Reduced the number of allocations in the macro parser.][50855] This can
251 improve compile times of macro heavy crates on average by 5%.
255 - [Implemented `Default` for `&mut str`.][51306]
256 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
257 - [Implemented `Extend` for `()`.][50234]
258 - [The `Debug` implementation of `time::Duration` should now be more easily
259 human readable.][50364] Previously a `Duration` of one second would printed as
260 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
261 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
262 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
263 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
264 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
265 for `PathBuf`.][50170]
266 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
267 and `Wrapping<i128>`.][50465]
268 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
269 possible.][51050] This can provide up to a 40% speed increase.
270 - [Improved error messages when using `format!`.][50610]
274 - [`Iterator::step_by`]
275 - [`Path::ancestors`]
276 - [`SystemTime::UNIX_EPOCH`]
277 - [`alloc::GlobalAlloc`]
279 - [`alloc::LayoutErr`]
282 - [`alloc::alloc_zeroed`]
285 - [`alloc::handle_alloc_error`]
286 - [`btree_map::Entry::or_default`]
288 - [`hash_map::Entry::or_default`]
289 - [`iter::repeat_with`]
290 - [`num::NonZeroUsize`]
291 - [`num::NonZeroU128`]
292 - [`num::NonZeroU16`]
293 - [`num::NonZeroU32`]
294 - [`num::NonZeroU64`]
296 - [`ops::RangeBounds`]
297 - [`slice::SliceIndex`]
298 - [`slice::from_mut`]
299 - [`slice::from_ref`]
300 - [`{Any + Send + Sync}::downcast_mut`]
301 - [`{Any + Send + Sync}::downcast_ref`]
302 - [`{Any + Send + Sync}::is`]
306 - [Cargo will now no longer allow you to publish crates with build scripts that
307 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
308 considered to be immutable.
312 - [The `suggestion_applicability` field in `rustc`'s json output is now
313 stable.][50486] This will allow dev tools to check whether a code suggestion
318 - [Rust will consider trait objects with duplicated constraints to be the same
319 type as without the duplicated constraint.][51276] For example the below code will
325 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
328 impl Trait + Send + Send {
329 fn test(&self) { println!("two"); }
333 [49546]: https://github.com/rust-lang/rust/pull/49546/
334 [50143]: https://github.com/rust-lang/rust/pull/50143/
335 [50170]: https://github.com/rust-lang/rust/pull/50170/
336 [50234]: https://github.com/rust-lang/rust/pull/50234/
337 [50265]: https://github.com/rust-lang/rust/pull/50265/
338 [50364]: https://github.com/rust-lang/rust/pull/50364/
339 [50385]: https://github.com/rust-lang/rust/pull/50385/
340 [50465]: https://github.com/rust-lang/rust/pull/50465/
341 [50486]: https://github.com/rust-lang/rust/pull/50486/
342 [50554]: https://github.com/rust-lang/rust/pull/50554/
343 [50610]: https://github.com/rust-lang/rust/pull/50610/
344 [50855]: https://github.com/rust-lang/rust/pull/50855/
345 [51050]: https://github.com/rust-lang/rust/pull/51050/
346 [51196]: https://github.com/rust-lang/rust/pull/51196/
347 [51200]: https://github.com/rust-lang/rust/pull/51200/
348 [51241]: https://github.com/rust-lang/rust/pull/51241/
349 [51276]: https://github.com/rust-lang/rust/pull/51276/
350 [51298]: https://github.com/rust-lang/rust/pull/51298/
351 [51306]: https://github.com/rust-lang/rust/pull/51306/
352 [51562]: https://github.com/rust-lang/rust/pull/51562/
353 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
354 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
355 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
356 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
357 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
358 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
359 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
360 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
361 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
362 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
363 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
364 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
365 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
366 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
367 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
368 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
369 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
370 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
371 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
372 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
373 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
374 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
375 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
376 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
377 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
378 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
379 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
380 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
381 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
382 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
384 Version 1.27.2 (2018-07-20)
385 ===========================
390 - The borrow checker was fixed to avoid potential unsoundness when using
391 match ergonomics: [#52213][52213].
393 [52213]: https://github.com/rust-lang/rust/issues/52213
395 Version 1.27.1 (2018-07-10)
396 ===========================
401 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
402 when running, which enabled executing code as some other user on a
403 given machine. This release fixes that vulnerability; you can read
404 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
406 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
411 - The borrow checker was fixed to avoid an additional potential unsoundness when using
412 match ergonomics: [#51415][51415], [#49534][49534].
414 [51415]: https://github.com/rust-lang/rust/issues/51415
415 [49534]: https://github.com/rust-lang/rust/issues/49534
416 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
417 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
419 Version 1.27.0 (2018-06-21)
420 ==========================
424 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
425 be used as an identifier.
426 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
427 bare `Trait` syntax, and should make it clearer when being used in tandem with
428 `impl Trait` because it is equivalent to the following syntax:
429 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
430 `Box<Trait> == Box<dyn Trait>`.
431 - [Attributes on generic parameters such as types and lifetimes are
432 now stable.][48851] e.g.
433 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
434 - [The `#[must_use]` attribute can now also be used on functions as well as
435 types.][48925] It provides a lint that by default warns users when the
436 value returned by a function has not been used.
440 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
444 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
445 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
446 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
447 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
449 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
450 std are now available in core.][49896]
451 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
453 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
454 that the operation isn't done in place.
455 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
456 the `#[must_use]` attribute][49533] to warn about unused potentially
457 expensive allocations.
461 - [`DoubleEndedIterator::rfind`]
462 - [`DoubleEndedIterator::rfold`]
463 - [`DoubleEndedIterator::try_rfold`]
464 - [`Duration::from_micros`]
465 - [`Duration::from_nanos`]
466 - [`Duration::subsec_micros`]
467 - [`Duration::subsec_millis`]
468 - [`HashMap::remove_entry`]
469 - [`Iterator::try_fold`]
470 - [`Iterator::try_for_each`]
473 - [`String::replace_range`]
474 - [`Take::set_limit`]
475 - [`hint::unreachable_unchecked`]
476 - [`os::unix::process::parent_id`]
477 - [`ptr::swap_nonoverlapping`]
478 - [`slice::rsplit_mut`]
480 - [`slice::swap_with_slice`]
484 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
485 `readme`, and `repository` fields.][cargo/5386]
486 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
487 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
488 a different directory than `target` for placing compilation artifacts.
489 - [Cargo will be adding automatic target inference for binaries, benchmarks,
490 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
491 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
492 where cargo would infer a binary, Cargo will produce a warning. You can
493 disable this feature ahead of time by setting any of the following to false:
494 `autobins`, `autobenches`, `autoexamples`, `autotests`.
495 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
496 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
500 - [Added “The Rustc book” into the official documentation.][49707]
501 [“The Rustc book”] documents and teaches how to use the rustc compiler.
502 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
506 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
507 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
508 compile, `"".is_empty()` will still compile.
509 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
510 will only print the inner type.][48553] E.g.
511 `print!("{:?}", AtomicBool::new(true))` will print `true`,
512 not `AtomicBool(true)`.
513 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
514 could enter higher numbers but they were not supported by LLVM. Up to 512MB
515 alignment should cover all use cases.
516 - The `.description()` method on the `std::error::Error` trait
517 [has been soft-deprecated][50163]. It is no longer required to implement it.
519 [48553]: https://github.com/rust-lang/rust/pull/48553/
520 [48851]: https://github.com/rust-lang/rust/pull/48851/
521 [48925]: https://github.com/rust-lang/rust/pull/48925/
522 [49533]: https://github.com/rust-lang/rust/pull/49533/
523 [49623]: https://github.com/rust-lang/rust/pull/49623/
524 [49630]: https://github.com/rust-lang/rust/pull/49630/
525 [49664]: https://github.com/rust-lang/rust/pull/49664/
526 [49699]: https://github.com/rust-lang/rust/pull/49699/
527 [49707]: https://github.com/rust-lang/rust/pull/49707/
528 [49719]: https://github.com/rust-lang/rust/pull/49719/
529 [49896]: https://github.com/rust-lang/rust/pull/49896/
530 [49968]: https://github.com/rust-lang/rust/pull/49968/
531 [50163]: https://github.com/rust-lang/rust/pull/50163
532 [50177]: https://github.com/rust-lang/rust/pull/50177/
533 [50378]: https://github.com/rust-lang/rust/pull/50378/
534 [50398]: https://github.com/rust-lang/rust/pull/50398/
535 [50423]: https://github.com/rust-lang/rust/pull/50423/
536 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
537 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
538 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
539 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
540 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
541 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
542 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
543 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
544 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
545 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
546 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
547 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
548 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
549 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
550 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
551 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
552 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
553 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
554 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
555 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
556 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
557 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
558 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
559 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
560 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
561 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
562 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
563 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
564 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
565 [“The Rustc book”]: https://doc.rust-lang.org/rustc
568 Version 1.26.2 (2018-06-05)
569 ==========================
574 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
576 [51117]: https://github.com/rust-lang/rust/issues/51117
579 Version 1.26.1 (2018-05-29)
580 ==========================
585 - [RLS now works on Windows.][50646]
586 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
592 - [`fn main() -> impl Trait` no longer works for non-Termination
594 This reverts an accidental stabilization.
595 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
596 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
598 [50646]: https://github.com/rust-lang/rust/issues/50646
599 [50656]: https://github.com/rust-lang/rust/pull/50656
600 [50812]: https://github.com/rust-lang/rust/pull/50812
601 [50950]: https://github.com/rust-lang/rust/issues/50950
602 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
604 Version 1.26.0 (2018-05-10)
605 ==========================
609 - [Closures now implement `Copy` and/or `Clone` if all captured variables
610 implement either or both traits.][49299]
611 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
612 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
613 lifetime can be elided.][49458]
614 - [`impl Trait` is now stable allowing you to have abstract types in returns
615 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
616 `fn open(path: impl AsRef<Path>)`.
617 - [Pattern matching will now automatically apply dereferences.][49394]
618 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
619 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
620 - [A lot of operations are now available in a const context.][46882] E.g. You
621 can now index into constant arrays, reference and dereference into constants,
622 and use tuple struct constructors.
623 - [Fixed entry slice patterns are now stable.][48516] E.g.
625 let points = [1, 2, 3, 4];
627 [1, 2, 3, 4] => println!("All points were sequential."),
628 _ => println!("Not all points were sequential."),
635 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
636 - [Fixed exponential projection complexity on nested types.][48296]
637 This can provide up to a ~12% reduction in compile times for certain crates.
638 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
639 to remap path prefixes outputted by the compiler.
640 - [Added `powerpc-unknown-netbsd` target.][48281]
644 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
645 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
646 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
647 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
648 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
649 - [`ascii::escape_default` is now available in libcore.][48735]
650 - [Trailing commas are now supported in std and core macros.][48056]
651 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
652 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
657 - [`*const T::copy_to_nonoverlapping`]
658 - [`*const T::copy_to`]
659 - [`*const T::read_unaligned`]
660 - [`*const T::read_volatile`]
663 - [`*const T::wrapping_add`]
664 - [`*const T::wrapping_sub`]
666 - [`*mut T::copy_to_nonoverlapping`]
667 - [`*mut T::copy_to`]
668 - [`*mut T::read_unaligned`]
669 - [`*mut T::read_volatile`]
671 - [`*mut T::replace`]
674 - [`*mut T::wrapping_add`]
675 - [`*mut T::wrapping_sub`]
676 - [`*mut T::write_bytes`]
677 - [`*mut T::write_unaligned`]
678 - [`*mut T::write_volatile`]
681 - [`FromUtf8Error::as_bytes`]
682 - [`LocalKey::try_with`]
684 - [`btree_map::Entry::and_modify`]
685 - [`fs::read_to_string`]
688 - [`hash_map::Entry::and_modify`]
689 - [`iter::FusedIterator`]
690 - [`ops::RangeInclusive`]
691 - [`ops::RangeToInclusive`]
693 - [`slice::rotate_left`]
694 - [`slice::rotate_right`]
700 - [Cargo will now output path to custom commands when `-v` is
701 passed with `--list`][cargo/5041]
702 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
706 - [The second edition of "The Rust Programming Language" book is now recommended
707 over the first.][48404]
712 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
713 syntax is now invalid.
715 use std::ops::Fn as dyn;
716 fn g(_: Box<dyn(std::fmt::Debug)>) {}
718 - [The result of dereferences are no longer promoted to `'static`.][47408]
722 const PAIR: &(i32, i32) = &(0, 1);
723 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
726 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
727 - [`".e0"` will now no longer parse as `0.0` and will instead cause
729 - [Removed hoedown from rustdoc.][48274]
730 - [Bounds on higher-kinded lifetimes a hard error.][48326]
732 [46882]: https://github.com/rust-lang/rust/pull/46882
733 [47379]: https://github.com/rust-lang/rust/pull/47379
734 [47408]: https://github.com/rust-lang/rust/pull/47408
735 [47813]: https://github.com/rust-lang/rust/pull/47813
736 [48056]: https://github.com/rust-lang/rust/pull/48056
737 [48125]: https://github.com/rust-lang/rust/pull/48125
738 [48166]: https://github.com/rust-lang/rust/pull/48166
739 [48235]: https://github.com/rust-lang/rust/pull/48235
740 [48274]: https://github.com/rust-lang/rust/pull/48274
741 [48281]: https://github.com/rust-lang/rust/pull/48281
742 [48296]: https://github.com/rust-lang/rust/pull/48296
743 [48326]: https://github.com/rust-lang/rust/pull/48326
744 [48359]: https://github.com/rust-lang/rust/pull/48359
745 [48404]: https://github.com/rust-lang/rust/pull/48404
746 [48481]: https://github.com/rust-lang/rust/pull/48481
747 [48516]: https://github.com/rust-lang/rust/pull/48516
748 [48628]: https://github.com/rust-lang/rust/pull/48628
749 [48629]: https://github.com/rust-lang/rust/pull/48629
750 [48657]: https://github.com/rust-lang/rust/pull/48657
751 [48735]: https://github.com/rust-lang/rust/pull/48735
752 [48978]: https://github.com/rust-lang/rust/pull/48978
753 [49101]: https://github.com/rust-lang/rust/pull/49101
754 [49109]: https://github.com/rust-lang/rust/pull/49109
755 [49121]: https://github.com/rust-lang/rust/pull/49121
756 [49162]: https://github.com/rust-lang/rust/pull/49162
757 [49184]: https://github.com/rust-lang/rust/pull/49184
758 [49234]: https://github.com/rust-lang/rust/pull/49234
759 [49255]: https://github.com/rust-lang/rust/pull/49255
760 [49299]: https://github.com/rust-lang/rust/pull/49299
761 [49305]: https://github.com/rust-lang/rust/pull/49305
762 [49394]: https://github.com/rust-lang/rust/pull/49394
763 [49458]: https://github.com/rust-lang/rust/pull/49458
764 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
765 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
766 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
767 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
768 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
769 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
770 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
771 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
772 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
773 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
774 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
775 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
776 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
777 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
778 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
779 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
780 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
781 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
782 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
783 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
784 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
785 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
786 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
787 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
788 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
789 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
790 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
791 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
792 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
793 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
794 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
795 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
796 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
797 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
798 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
799 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
800 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
801 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
802 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
803 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
804 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
805 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
808 Version 1.25.0 (2018-03-29)
809 ==========================
813 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
814 - [You can now use nested groups of imports.][47948]
815 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
816 - [You can now have `|` at the start of a match arm.][47947] e.g.
824 | Foo::B => println!("AB"),
825 | Foo::C => println!("C"),
832 - [Upgraded to LLVM 6.][47828]
833 - [Added `-C lto=val` option.][47521]
834 - [Added `i586-unknown-linux-musl` target][47282]
838 - [Impl Send for `process::Command` on Unix.][47760]
839 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
840 - [`UnsafeCell::into_inner` is now safe.][47204]
841 - [Implement libstd for CloudABI.][47268]
842 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
843 - [Implement `AsRef<Path>` for Component][46985]
844 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
845 - [Moved `Duration` to libcore.][46666]
849 - [`Location::column`]
852 The following functions can now be used in a constant expression.
853 eg. `static MINUTE: Duration = Duration::from_secs(60);`
854 - [`Duration::new`][47300]
855 - [`Duration::from_secs`][47300]
856 - [`Duration::from_millis`][47300]
860 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
861 - [`cargo new` now defaults to creating a binary crate, instead of a
862 library crate.][cargo/5029]
866 - [Rust by example is now shipped with new releases][46196]
870 - [Deprecated `net::lookup_host`.][47510]
871 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
872 - The borrow checker was sometimes incorrectly permitting overlapping borrows
873 around indexing operations (see [#47349][47349]). This has been fixed (which also
874 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
875 - [Removed deprecated unstable attribute `#[simd]`.][47251]
877 [33903]: https://github.com/rust-lang/rust/pull/33903
878 [47947]: https://github.com/rust-lang/rust/pull/47947
879 [47948]: https://github.com/rust-lang/rust/pull/47948
880 [47760]: https://github.com/rust-lang/rust/pull/47760
881 [47790]: https://github.com/rust-lang/rust/pull/47790
882 [47828]: https://github.com/rust-lang/rust/pull/47828
883 [47398]: https://github.com/rust-lang/rust/pull/47398
884 [47510]: https://github.com/rust-lang/rust/pull/47510
885 [47521]: https://github.com/rust-lang/rust/pull/47521
886 [47204]: https://github.com/rust-lang/rust/pull/47204
887 [47251]: https://github.com/rust-lang/rust/pull/47251
888 [47268]: https://github.com/rust-lang/rust/pull/47268
889 [47282]: https://github.com/rust-lang/rust/pull/47282
890 [47300]: https://github.com/rust-lang/rust/pull/47300
891 [47349]: https://github.com/rust-lang/rust/pull/47349
892 [46931]: https://github.com/rust-lang/rust/pull/46931
893 [46985]: https://github.com/rust-lang/rust/pull/46985
894 [47006]: https://github.com/rust-lang/rust/pull/47006
895 [46830]: https://github.com/rust-lang/rust/pull/46830
896 [46095]: https://github.com/rust-lang/rust/pull/46095
897 [46666]: https://github.com/rust-lang/rust/pull/46666
898 [46196]: https://github.com/rust-lang/rust/pull/46196
899 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
900 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
901 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
902 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
903 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
906 Version 1.24.1 (2018-03-01)
907 ==========================
909 - [Do not abort when unwinding through FFI][48251]
910 - [Emit UTF-16 files for linker arguments on Windows][48318]
911 - [Make the error index generator work again][48308]
912 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
914 [48251]: https://github.com/rust-lang/rust/issues/48251
915 [48308]: https://github.com/rust-lang/rust/issues/48308
916 [48318]: https://github.com/rust-lang/rust/issues/48318
917 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
920 Version 1.24.0 (2018-02-15)
921 ==========================
925 - [External `sysv64` ffi is now available.][46528]
926 eg. `extern "sysv64" fn foo () {}`
930 - [rustc now uses 16 codegen units by default for release builds.][46910]
931 For the fastest builds, utilize `codegen-units=1`.
932 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
933 - [Add `aarch64-unknown-openbsd` support][46760]
937 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
938 improvement in performance in the majority of cases.
939 - [`OsStr`'s `Debug` implementation is now lossless and consistent
940 with Windows.][46798]
941 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
942 - [impl `From<bool>` for `AtomicBool`][46293]
943 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
944 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
945 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
946 - [float::from_bits now just uses transmute.][46012] This provides
947 some optimisations from LLVM.
948 - [Copied `AsciiExt` methods onto `char`][46077]
949 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
950 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
951 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
952 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
956 - [`RefCell::replace`]
958 - [`atomic::spin_loop_hint`]
960 The following functions can now be used in a constant expression.
961 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
963 - [`AtomicBool::new`][46287]
964 - [`AtomicUsize::new`][46287]
965 - [`AtomicIsize::new`][46287]
966 - [`AtomicPtr::new`][46287]
967 - [`Cell::new`][46287]
968 - [`{integer}::min_value`][46287]
969 - [`{integer}::max_value`][46287]
970 - [`mem::size_of`][46287]
971 - [`mem::align_of`][46287]
972 - [`ptr::null`][46287]
973 - [`ptr::null_mut`][46287]
974 - [`RefCell::new`][46287]
975 - [`UnsafeCell::new`][46287]
979 - [Added a `workspace.default-members` config that
980 overrides implied `--all` in virtual workspaces.][cargo/4743]
981 - [Enable incremental by default on development builds.][cargo/4817] Also added
982 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
983 per-project or global basis respectively.
990 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
991 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
992 in accordance with IETF RFC 4291 §2.2.
993 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
994 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
995 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
996 - [Leading zeros in tuple struct members is now an error][47084]
997 - [`column!()` macro is one-based instead of zero-based][46977]
998 - [`fmt::Arguments` can no longer be shared across threads][45198]
999 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1000 - [Cargo sets a different working directory for the compiler][cargo/4788]
1002 [44884]: https://github.com/rust-lang/rust/pull/44884
1003 [45198]: https://github.com/rust-lang/rust/pull/45198
1004 [45506]: https://github.com/rust-lang/rust/pull/45506
1005 [45904]: https://github.com/rust-lang/rust/pull/45904
1006 [45990]: https://github.com/rust-lang/rust/pull/45990
1007 [46012]: https://github.com/rust-lang/rust/pull/46012
1008 [46077]: https://github.com/rust-lang/rust/pull/46077
1009 [46094]: https://github.com/rust-lang/rust/pull/46094
1010 [46284]: https://github.com/rust-lang/rust/pull/46284
1011 [46287]: https://github.com/rust-lang/rust/pull/46287
1012 [46293]: https://github.com/rust-lang/rust/pull/46293
1013 [46528]: https://github.com/rust-lang/rust/pull/46528
1014 [46671]: https://github.com/rust-lang/rust/pull/46671
1015 [46713]: https://github.com/rust-lang/rust/pull/46713
1016 [46735]: https://github.com/rust-lang/rust/pull/46735
1017 [46749]: https://github.com/rust-lang/rust/pull/46749
1018 [46760]: https://github.com/rust-lang/rust/pull/46760
1019 [46798]: https://github.com/rust-lang/rust/pull/46798
1020 [46828]: https://github.com/rust-lang/rust/pull/46828
1021 [46831]: https://github.com/rust-lang/rust/pull/46831
1022 [46833]: https://github.com/rust-lang/rust/pull/46833
1023 [46910]: https://github.com/rust-lang/rust/pull/46910
1024 [46977]: https://github.com/rust-lang/rust/pull/46977
1025 [47018]: https://github.com/rust-lang/rust/pull/47018
1026 [47080]: https://github.com/rust-lang/rust/pull/47080
1027 [47084]: https://github.com/rust-lang/rust/pull/47084
1028 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1029 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1030 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1031 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1032 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1033 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1036 Version 1.23.0 (2018-01-04)
1037 ==========================
1041 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1042 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1043 Which should fix some confusing errors in some operations.
1047 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1048 undefined behavior.][45920]
1049 - [rustc now suggests renaming import if names clash.][45660]
1050 - [Display errors/warnings correctly when there are zero-width or
1051 wide characters.][45711]
1052 - [rustc now avoids unnecessary copies of arguments that are
1053 simple bindings][45380] This should improve memory usage on average by 5-10%.
1054 - [Updated musl used to build musl rustc to 1.1.17][45393]
1058 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1059 - [Implement Hash for raw pointers to unsized types][45483]
1060 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1061 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1062 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1063 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1064 and `<*mut T>::as_mut`][44932]
1065 - [Optimized `Thread::{park, unpark}` implementation][45524]
1066 - [Improved `SliceExt::binary_search` performance.][45333]
1067 - [impl `FromIterator<()>` for `()`][45379]
1068 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1076 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1077 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1078 - [Added unit test checking to `cargo check`][cargo/4592]
1079 - [Cargo now lets you install a specific version
1080 using `cargo install --version`][cargo/4637]
1084 - [Releases now ship with the Cargo book documentation.][45692]
1085 - [rustdoc now prints rendering warnings on every run.][45324]
1089 - [Changes have been made to type equality to make it more correct,
1090 in rare cases this could break some code.][45853] [Tracking issue for
1091 further information][45852]
1092 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1093 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1094 Android 9, the minimum supported version is Android 14.
1095 - [Bumped the minimum LLVM to 3.9][45326]
1097 [44042]: https://github.com/rust-lang/rust/pull/44042
1098 [44932]: https://github.com/rust-lang/rust/pull/44932
1099 [45267]: https://github.com/rust-lang/rust/pull/45267
1100 [45324]: https://github.com/rust-lang/rust/pull/45324
1101 [45326]: https://github.com/rust-lang/rust/pull/45326
1102 [45333]: https://github.com/rust-lang/rust/pull/45333
1103 [45379]: https://github.com/rust-lang/rust/pull/45379
1104 [45380]: https://github.com/rust-lang/rust/pull/45380
1105 [45393]: https://github.com/rust-lang/rust/pull/45393
1106 [45435]: https://github.com/rust-lang/rust/pull/45435
1107 [45483]: https://github.com/rust-lang/rust/pull/45483
1108 [45524]: https://github.com/rust-lang/rust/pull/45524
1109 [45571]: https://github.com/rust-lang/rust/pull/45571
1110 [45580]: https://github.com/rust-lang/rust/pull/45580
1111 [45610]: https://github.com/rust-lang/rust/pull/45610
1112 [45660]: https://github.com/rust-lang/rust/pull/45660
1113 [45692]: https://github.com/rust-lang/rust/pull/45692
1114 [45711]: https://github.com/rust-lang/rust/pull/45711
1115 [45772]: https://github.com/rust-lang/rust/pull/45772
1116 [45852]: https://github.com/rust-lang/rust/issues/45852
1117 [45853]: https://github.com/rust-lang/rust/pull/45853
1118 [45887]: https://github.com/rust-lang/rust/pull/45887
1119 [45920]: https://github.com/rust-lang/rust/pull/45920
1120 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1121 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1122 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1125 Version 1.22.1 (2017-11-22)
1126 ==========================
1128 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1130 [46183]: https://github.com/rust-lang/rust/pull/46183
1132 Version 1.22.0 (2017-11-22)
1133 ==========================
1137 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1138 - [Now accepts underscores in unicode escapes][43716]
1139 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1140 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1144 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1145 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1146 This should decrease compile times for debug builds.
1147 - [strict memory alignment now enabled on ARMv6][45094]
1148 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1152 - [Allow atomic operations up to 32 bits
1153 on `armv5te_unknown_linux_gnueabi`][44978]
1154 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1155 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1156 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1157 - [Properly detect overflow in `Instant += Duration`.][44220]
1158 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1159 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1160 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1167 - [Cargo will now build multi file examples in subdirectories of the `examples`
1168 folder that have a `main.rs` file.][cargo/4496]
1169 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1170 the old format will continue to work and can be updated with `cargo update`.
1171 - [Now supports vendoring git repositories][cargo/3992]
1175 - [`libbacktrace` is now available on Apple platforms.][44251]
1176 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1177 This now lets you specify that a given code example will fail to compile.
1181 - [The minimum Android version that rustc can build for has been bumped
1182 to `4.0` from `2.3`][45656]
1183 - [Allowing `T op= &T` for numeric types has broken some type
1184 inference cases][45480]
1187 [42526]: https://github.com/rust-lang/rust/pull/42526
1188 [43017]: https://github.com/rust-lang/rust/pull/43017
1189 [43716]: https://github.com/rust-lang/rust/pull/43716
1190 [43949]: https://github.com/rust-lang/rust/pull/43949
1191 [44015]: https://github.com/rust-lang/rust/pull/44015
1192 [44220]: https://github.com/rust-lang/rust/pull/44220
1193 [44251]: https://github.com/rust-lang/rust/pull/44251
1194 [44287]: https://github.com/rust-lang/rust/pull/44287
1195 [44303]: https://github.com/rust-lang/rust/pull/44303
1196 [44456]: https://github.com/rust-lang/rust/pull/44456
1197 [44466]: https://github.com/rust-lang/rust/pull/44466
1198 [44895]: https://github.com/rust-lang/rust/pull/44895
1199 [44966]: https://github.com/rust-lang/rust/pull/44966
1200 [44978]: https://github.com/rust-lang/rust/pull/44978
1201 [45041]: https://github.com/rust-lang/rust/pull/45041
1202 [45064]: https://github.com/rust-lang/rust/pull/45064
1203 [45075]: https://github.com/rust-lang/rust/pull/45075
1204 [45094]: https://github.com/rust-lang/rust/pull/45094
1205 [45095]: https://github.com/rust-lang/rust/pull/45095
1206 [45480]: https://github.com/rust-lang/rust/issues/45480
1207 [45656]: https://github.com/rust-lang/rust/pull/45656
1208 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1209 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1210 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1217 Version 1.21.0 (2017-10-12)
1218 ==========================
1222 - [You can now use static references for literals.][43838]
1226 let x: &'static u32 = &0;
1229 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1232 my_macro!(Vec<i32>::new); // Always worked
1233 my_macro!(Vec::<i32>::new); // Now works
1238 - [Upgraded jemalloc to 4.5.0][43911]
1239 - [Enabled unwinding panics on Redox][43917]
1240 - [Now runs LLVM in parallel during translation phase.][43506]
1241 This should reduce peak memory usage.
1245 - [Generate builtin impls for `Clone` for all arrays and tuples that
1246 are `T: Clone`][43690]
1247 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1248 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1249 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1254 [`std::mem::discriminant`]
1258 - [You can now call `cargo install` with multiple package names][cargo/4216]
1259 - [Cargo commands inside a virtual workspace will now implicitly
1260 pass `--all`][cargo/4335]
1261 - [Added a `[patch]` section to `Cargo.toml` to handle
1262 prepublication dependencies][cargo/4123] [RFC 1969]
1263 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1264 like patterns][cargo/4270]
1265 - [Added the `--all-targets` option][cargo/4400]
1266 - [Using required dependencies as a feature is now deprecated and emits
1267 a warning][cargo/4364]
1272 - [Cargo docs are moving][43916]
1273 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1274 - [The rustdoc book is now available][43863]
1275 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1276 - [Added a preview of RLS has been made available through rustup][44204]
1277 Install with `rustup component add rls-preview`
1278 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1279 Previously only showed `std::os::unix`.
1283 - [Changes in method matching against higher-ranked types][43880] This may cause
1284 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1285 - [rustc's JSON error output's byte position start at top of file.][42973]
1286 Was previously relative to the rustc's internal `CodeMap` struct which
1287 required the unstable library `libsyntax` to correctly use.
1288 - [`unused_results` lint no longer ignores booleans][43728]
1290 [42565]: https://github.com/rust-lang/rust/pull/42565
1291 [42973]: https://github.com/rust-lang/rust/pull/42973
1292 [43348]: https://github.com/rust-lang/rust/pull/43348
1293 [43459]: https://github.com/rust-lang/rust/pull/43459
1294 [43506]: https://github.com/rust-lang/rust/pull/43506
1295 [43540]: https://github.com/rust-lang/rust/pull/43540
1296 [43690]: https://github.com/rust-lang/rust/pull/43690
1297 [43728]: https://github.com/rust-lang/rust/pull/43728
1298 [43838]: https://github.com/rust-lang/rust/pull/43838
1299 [43863]: https://github.com/rust-lang/rust/pull/43863
1300 [43880]: https://github.com/rust-lang/rust/pull/43880
1301 [43911]: https://github.com/rust-lang/rust/pull/43911
1302 [43916]: https://github.com/rust-lang/rust/pull/43916
1303 [43917]: https://github.com/rust-lang/rust/pull/43917
1304 [44204]: https://github.com/rust-lang/rust/pull/44204
1305 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1306 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1307 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1308 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1309 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1310 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1311 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1312 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1313 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1315 Version 1.20.0 (2017-08-31)
1316 ===========================
1320 - [Associated constants are now stabilised.][42809]
1321 - [A lot of macro bugs are now fixed.][42913]
1326 - [Struct fields are now properly coerced to the expected field type.][42807]
1327 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1328 `wasm32-experimental-emscripten` target.
1329 - [Changed some of the error messages to be more helpful.][42033]
1330 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1332 - [rustc now reports the total number of errors on compilation failure][43015]
1333 previously this was only the number of errors in the pass that failed.
1334 - [Expansion in rustc has been sped up 29x.][42533]
1335 - [added `msp430-none-elf` target.][43099]
1336 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1338 - [Fixes backtraces on Redox][43228]
1339 - [rustc now identifies different versions of same crate when absolute paths of
1340 different types match in an error message.][42826]
1346 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1347 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1349 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1350 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1351 - [Impl `Clone` for `DefaultHasher`.][42799]
1352 - [Impl `Sync` for `SyncSender`.][42397]
1353 - [Impl `FromStr` for `char`][42271]
1354 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1356 - [allow messages in the `unimplemented!()` macro.][42155]
1357 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1358 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1359 - [Upgrade to Unicode 10.0.0][42999]
1360 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1361 - [Skip the main thread's manual stack guard on Linux][43072]
1362 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1363 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1365 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1370 - [`CStr::into_c_string`]
1371 - [`CString::as_c_str`]
1372 - [`CString::into_boxed_c_str`]
1373 - [`Chain::get_mut`]
1374 - [`Chain::get_ref`]
1375 - [`Chain::into_inner`]
1376 - [`Option::get_or_insert_with`]
1377 - [`Option::get_or_insert`]
1378 - [`OsStr::into_os_string`]
1379 - [`OsString::into_boxed_os_str`]
1382 - [`Utf8Error::error_len`]
1383 - [`char::EscapeDebug`]
1384 - [`char::escape_debug`]
1385 - [`compile_error!`]
1386 - [`f32::from_bits`]
1388 - [`f64::from_bits`]
1390 - [`mem::ManuallyDrop`]
1391 - [`slice::sort_unstable_by_key`]
1392 - [`slice::sort_unstable_by`]
1393 - [`slice::sort_unstable`]
1394 - [`str::from_boxed_utf8_unchecked`]
1395 - [`str::as_bytes_mut`]
1396 - [`str::as_bytes_mut`]
1397 - [`str::from_utf8_mut`]
1398 - [`str::from_utf8_unchecked_mut`]
1400 - [`str::get_unchecked_mut`]
1401 - [`str::get_unchecked`]
1403 - [`str::into_boxed_bytes`]
1408 - [Cargo API token location moved from `~/.cargo/config` to
1409 `~/.cargo/credentials`.][cargo/3978]
1410 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1411 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1412 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1413 - [You can now specify version of a binary when installed through
1414 `cargo install` using `--vers`.][cargo/4229]
1415 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1416 failure.][cargo/4248]
1417 - [Changed the convention around which file is the crate root.][cargo/4259]
1418 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1419 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1424 - [Functions with `'static` in their return types will now not be as usable as
1425 if they were using lifetime parameters instead.][42417]
1426 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1427 takes the sign of NaN into account where previously didn't.][42430]
1429 [42033]: https://github.com/rust-lang/rust/pull/42033
1430 [42155]: https://github.com/rust-lang/rust/pull/42155
1431 [42271]: https://github.com/rust-lang/rust/pull/42271
1432 [42397]: https://github.com/rust-lang/rust/pull/42397
1433 [42417]: https://github.com/rust-lang/rust/pull/42417
1434 [42430]: https://github.com/rust-lang/rust/pull/42430
1435 [42431]: https://github.com/rust-lang/rust/pull/42431
1436 [42533]: https://github.com/rust-lang/rust/pull/42533
1437 [42571]: https://github.com/rust-lang/rust/pull/42571
1438 [42613]: https://github.com/rust-lang/rust/pull/42613
1439 [42799]: https://github.com/rust-lang/rust/pull/42799
1440 [42807]: https://github.com/rust-lang/rust/pull/42807
1441 [42809]: https://github.com/rust-lang/rust/pull/42809
1442 [42822]: https://github.com/rust-lang/rust/pull/42822
1443 [42826]: https://github.com/rust-lang/rust/pull/42826
1444 [42854]: https://github.com/rust-lang/rust/pull/42854
1445 [42913]: https://github.com/rust-lang/rust/pull/42913
1446 [42999]: https://github.com/rust-lang/rust/pull/42999
1447 [43011]: https://github.com/rust-lang/rust/pull/43011
1448 [43015]: https://github.com/rust-lang/rust/pull/43015
1449 [43072]: https://github.com/rust-lang/rust/pull/43072
1450 [43077]: https://github.com/rust-lang/rust/pull/43077
1451 [43097]: https://github.com/rust-lang/rust/pull/43097
1452 [43099]: https://github.com/rust-lang/rust/pull/43099
1453 [43170]: https://github.com/rust-lang/rust/pull/43170
1454 [43178]: https://github.com/rust-lang/rust/pull/43178
1455 [43185]: https://github.com/rust-lang/rust/pull/43185
1456 [43228]: https://github.com/rust-lang/rust/pull/43228
1457 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1458 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1459 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1460 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1461 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1462 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1463 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1464 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1465 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1466 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1467 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1468 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1469 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1470 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1471 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1472 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1473 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1474 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1475 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1476 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1477 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1478 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1479 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1480 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1481 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1482 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1483 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1484 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1485 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1486 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1487 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1488 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1489 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1490 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1491 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1492 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1493 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1494 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1495 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1498 Version 1.19.0 (2017-07-20)
1499 ===========================
1504 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1505 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1506 - [Macro recursion limit increased to 1024 from 64.][41676]
1507 - [Added lint for detecting unused macros.][41907]
1508 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1509 For example: `let x = loop { break 7; };`
1510 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1511 contain `Copy` types and cannot have a `Drop` implementation.
1512 Example: `union Foo { bar: u8, baz: usize }`
1513 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1514 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1519 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1520 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1521 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1522 you should use `--target armv7-linux-androideabi`.
1523 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1524 - [Minor optimisation of string operations.][42037]
1525 - [Compiler error message is now `aborting due to previous error(s)` instead of
1526 `aborting due to N previous errors`][42150] This was previously inaccurate and
1527 would only count certain kinds of errors.
1528 - [The compiler now supports Visual Studio 2017][42225]
1529 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1530 - [Added a lot][42264] of [new error codes][42302]
1531 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1532 libraries with C Run-time Libraries(CRT) to be statically linked.
1533 - [Fixed various ARM codegen bugs][42740]
1538 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1539 `Extend<Cow<'a, str>>`][41449]
1540 - [`Vec` now implements `From<&mut [T]>`][41530]
1541 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1542 - [`SplitWhitespace` now implements `Clone`][41659]
1543 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1545 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1546 macros, but for printing to stderr.
1551 - [`OsString::shrink_to_fit`]
1554 - [`thread::ThreadId`]
1559 - [Build scripts can now add environment variables to the environment
1560 the crate is being compiled in.
1561 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1562 - [Subcommands now replace the current process rather than spawning a new
1563 child process][cargo/3970]
1564 - [Workspace members can now accept glob file patterns][cargo/3979]
1565 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1566 the members in a given workspace.][cargo/3988]
1567 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1568 - [Target directory path is now in the cargo metadata][cargo/4022]
1569 - [Cargo no longer checks out a local working directory for the
1570 crates.io index][cargo/4026] This should provide smaller file size for the
1571 registry, and improve cloning times, especially on Windows machines.
1572 - [Added an `--exclude` option for excluding certain packages when using the
1573 `--all` option][cargo/4031]
1574 - [Cargo will now automatically retry when receiving a 5xx error
1575 from crates.io][cargo/4032]
1576 - [The `--features` option now accepts multiple comma or space
1577 delimited values.][cargo/4084]
1578 - [Added support for custom target specific runners][cargo/3954]
1583 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1585 - [Rust will now release XZ compressed packages][rust-installer/57]
1586 - [rustup will now prefer to download rust packages with
1587 XZ compression][rustup/1100] over GZip packages.
1588 - [Added the ability to escape `#` in rust documentation][41785] By adding
1589 additional `#`'s ie. `##` is now `#`
1594 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1595 - [`-Z` flags are now no longer allowed to be used on the stable
1596 compiler.][41751] This has been a warning for a year previous to this.
1597 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1598 longer works][42844]. Users should migrate to the built-in `check`
1599 command, which has been available since 1.16.
1600 - [Ending a float literal with `._` is now a hard error.
1601 Example: `42._` .][41946]
1602 - [Any use of a private `extern crate` outside of its module is now a
1603 hard error.][36886] This was previously a warning.
1604 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1605 relative while the `::` prefix makes a path absolute, but was ignored and the
1606 path was relative regardless.
1607 - [Floating point constants in match patterns is now a hard error][36890]
1608 This was previously a warning.
1609 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1610 match patterns is now a hard error][36891] This was previously a warning.
1611 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1613 - [From the pound escape, lines consisting of multiple `#`s are
1615 - [It is an error to re-export private enum variants][42460]. This is
1616 known to break a number of crates that depend on an older version of
1618 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1619 to use it to find the linker, and the build will fail where it did
1620 not previously][42607]
1622 [36886]: https://github.com/rust-lang/rust/issues/36886
1623 [36888]: https://github.com/rust-lang/rust/issues/36888
1624 [36890]: https://github.com/rust-lang/rust/issues/36890
1625 [36891]: https://github.com/rust-lang/rust/issues/36891
1626 [36892]: https://github.com/rust-lang/rust/issues/36892
1627 [37406]: https://github.com/rust-lang/rust/issues/37406
1628 [39983]: https://github.com/rust-lang/rust/pull/39983
1629 [41145]: https://github.com/rust-lang/rust/pull/41145
1630 [41192]: https://github.com/rust-lang/rust/pull/41192
1631 [41258]: https://github.com/rust-lang/rust/pull/41258
1632 [41370]: https://github.com/rust-lang/rust/pull/41370
1633 [41449]: https://github.com/rust-lang/rust/pull/41449
1634 [41530]: https://github.com/rust-lang/rust/pull/41530
1635 [41624]: https://github.com/rust-lang/rust/pull/41624
1636 [41656]: https://github.com/rust-lang/rust/pull/41656
1637 [41659]: https://github.com/rust-lang/rust/pull/41659
1638 [41676]: https://github.com/rust-lang/rust/pull/41676
1639 [41751]: https://github.com/rust-lang/rust/pull/41751
1640 [41764]: https://github.com/rust-lang/rust/pull/41764
1641 [41785]: https://github.com/rust-lang/rust/pull/41785
1642 [41873]: https://github.com/rust-lang/rust/pull/41873
1643 [41907]: https://github.com/rust-lang/rust/pull/41907
1644 [41946]: https://github.com/rust-lang/rust/pull/41946
1645 [42016]: https://github.com/rust-lang/rust/pull/42016
1646 [42037]: https://github.com/rust-lang/rust/pull/42037
1647 [42068]: https://github.com/rust-lang/rust/pull/42068
1648 [42150]: https://github.com/rust-lang/rust/pull/42150
1649 [42162]: https://github.com/rust-lang/rust/pull/42162
1650 [42225]: https://github.com/rust-lang/rust/pull/42225
1651 [42264]: https://github.com/rust-lang/rust/pull/42264
1652 [42302]: https://github.com/rust-lang/rust/pull/42302
1653 [42460]: https://github.com/rust-lang/rust/issues/42460
1654 [42607]: https://github.com/rust-lang/rust/issues/42607
1655 [42740]: https://github.com/rust-lang/rust/pull/42740
1656 [42844]: https://github.com/rust-lang/rust/issues/42844
1657 [42948]: https://github.com/rust-lang/rust/pull/42948
1658 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1659 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1660 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1661 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1662 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1663 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1664 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1665 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1666 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1667 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1668 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1669 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1670 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1671 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1672 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1673 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1674 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1675 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1676 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1677 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1678 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1679 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1682 Version 1.18.0 (2017-06-08)
1683 ===========================
1688 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1689 make the item visible to just that module tree. Also accepts the keyword
1690 `crate` to make something public to the whole crate but not users of the
1691 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1692 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1693 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1694 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1695 types like `Write + Send`, trailing `+` are now supported in trait objects,
1696 and better error reporting for trait objects starting with `?Sized`.
1697 - [0e+10 is now a valid floating point literal][40589]
1698 - [Now warns if you bind a lifetime parameter to 'static][40734]
1699 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1700 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1701 representation in some cases.][40377]
1706 - [rustc can now emit mir with `--emit mir`][39891]
1707 - [Improved LLVM IR for trivial functions][40367]
1708 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1709 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1710 opportunities found through profiling
1711 - [Improved backtrace formatting when panicking][38165]
1716 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1717 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1718 iteration or reallocation.
1719 - [Simplified HashMap Bucket interface][40561] provides performance
1720 improvements for iterating and cloning.
1721 - [Specialize Vec::from_elem to use calloc][40409]
1722 - [Fixed Race condition in fs::create_dir_all][39799]
1723 - [No longer caching stdio on Windows][40516]
1724 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1725 2.50%~ faster and in one case now 12.50% faster.
1726 - [Optimized `AtomicBool::fetch_nand`][41143]
1731 - [`Child::try_wait`]
1732 - [`HashMap::retain`]
1733 - [`HashSet::retain`]
1735 - [`TcpStream::peek`]
1736 - [`UdpSocket::peek`]
1737 - [`UdpSocket::peek_from`]
1742 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1743 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1744 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1745 - [Added Android build support][cargo/3885]
1746 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1747 of a certain type, for example `cargo build --bins` will build all
1749 - [Added support for haiku][cargo/3952]
1754 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1755 - [Added rust-windbg script for better debugging on Windows][39983]
1756 - [Rust now uses the official cross compiler for NetBSD][40612]
1757 - [rustdoc now accepts `#` at the start of files][40828]
1758 - [Fixed jemalloc support for musl][41168]
1763 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1764 always placed after the sign if it exists and before the digits. With the `#`
1765 flag the zeroes are placed after the prefix and before the digits.
1766 - [Due to the struct field optimisation][40377], using `transmute` on structs
1767 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1768 always been undefined behavior, but is now more likely to break in practice.
1769 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1770 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1771 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1772 - [Overlapping inherent `impl`s are now a hard error][40728]
1773 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1774 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1775 `out.asm` and `out.ll` instead of only one of the filetypes.
1776 - [ calling a function that returns `Self` will no longer work][41805] when
1777 the size of `Self` cannot be statically determined.
1778 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1779 this has caused a few regressions namely:
1781 - Changed the link order of local static/dynamic libraries (respecting the
1782 order on given rather than having the compiler reorder).
1783 - Changed how MinGW is linked, native code linked to dynamic libraries
1784 may require manually linking to the gcc support library (for the native
1787 [38165]: https://github.com/rust-lang/rust/pull/38165
1788 [39799]: https://github.com/rust-lang/rust/pull/39799
1789 [39891]: https://github.com/rust-lang/rust/pull/39891
1790 [39983]: https://github.com/rust-lang/rust/pull/39983
1791 [40043]: https://github.com/rust-lang/rust/pull/40043
1792 [40241]: https://github.com/rust-lang/rust/pull/40241
1793 [40338]: https://github.com/rust-lang/rust/pull/40338
1794 [40367]: https://github.com/rust-lang/rust/pull/40367
1795 [40377]: https://github.com/rust-lang/rust/pull/40377
1796 [40409]: https://github.com/rust-lang/rust/pull/40409
1797 [40516]: https://github.com/rust-lang/rust/pull/40516
1798 [40556]: https://github.com/rust-lang/rust/pull/40556
1799 [40561]: https://github.com/rust-lang/rust/pull/40561
1800 [40589]: https://github.com/rust-lang/rust/pull/40589
1801 [40612]: https://github.com/rust-lang/rust/pull/40612
1802 [40723]: https://github.com/rust-lang/rust/pull/40723
1803 [40728]: https://github.com/rust-lang/rust/pull/40728
1804 [40731]: https://github.com/rust-lang/rust/pull/40731
1805 [40734]: https://github.com/rust-lang/rust/pull/40734
1806 [40805]: https://github.com/rust-lang/rust/pull/40805
1807 [40807]: https://github.com/rust-lang/rust/pull/40807
1808 [40828]: https://github.com/rust-lang/rust/pull/40828
1809 [40870]: https://github.com/rust-lang/rust/pull/40870
1810 [41085]: https://github.com/rust-lang/rust/pull/41085
1811 [41143]: https://github.com/rust-lang/rust/pull/41143
1812 [41168]: https://github.com/rust-lang/rust/pull/41168
1813 [41270]: https://github.com/rust-lang/rust/issues/41270
1814 [41469]: https://github.com/rust-lang/rust/pull/41469
1815 [41805]: https://github.com/rust-lang/rust/issues/41805
1816 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1817 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1818 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1819 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1820 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1821 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1822 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1823 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1824 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1825 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1826 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1827 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1828 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1829 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1832 Version 1.17.0 (2017-04-27)
1833 ===========================
1838 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1839 * [Fields of structs may be initialized without duplicating the field/variable
1840 names][39761]. [RFC 1682]
1841 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1842 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1843 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1844 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1845 `'b`. Soundness fix.
1846 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1847 * [Static variables may contain references to other statics][40027]
1852 * [Exit quickly on only `--emit dep-info`][40336]
1853 * [Make `-C relocation-model` more correctly determine whether the linker
1854 creates a position-independent executable][40245]
1855 * [Add `-C overflow-checks` to directly control whether integer overflow
1857 * [The rustc type checker now checks items on demand instead of in a single
1858 in-order pass][40008]. This is mostly an internal refactoring in support of
1859 future work, including incremental type checking, but also resolves [RFC
1860 1647], allowing `Self` to appear in `impl` `where` clauses.
1861 * [Optimize vtable loads][39995]
1862 * [Turn off vectorization for Emscripten targets][39990]
1863 * [Provide suggestions for unknown macros imported with `use`][39953]
1864 * [Fix ICEs in path resolution][39939]
1865 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1866 * [Add clearer error message using `&str + &str`][39116]
1877 * [`Ordering::then`]
1878 * [`Ordering::then_with`]
1879 * [`BTreeMap::range`]
1880 * [`BTreeMap::range_mut`]
1881 * [`collections::Bound`]
1882 * [`process::abort`]
1883 * [`ptr::read_unaligned`]
1884 * [`ptr::write_unaligned`]
1885 * [`Result::expect_err`]
1888 * [`Cell::into_inner`]
1894 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1895 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1896 * [`String` implements `FromIterator<&char>`][40028]
1897 * `Box` [implements][40009] a number of new conversions:
1898 `From<Box<str>> for String`,
1899 `From<Box<[T]>> for Vec<T>`,
1900 `From<Box<CStr>> for CString`,
1901 `From<Box<OsStr>> for OsString`,
1902 `From<Box<Path>> for PathBuf`,
1903 `Into<Box<str>> for String`,
1904 `Into<Box<[T]>> for Vec<T>`,
1905 `Into<Box<CStr>> for CString`,
1906 `Into<Box<OsStr>> for OsString`,
1907 `Into<Box<Path>> for PathBuf`,
1908 `Default for Box<str>`,
1909 `Default for Box<CStr>`,
1910 `Default for Box<OsStr>`,
1911 `From<&CStr> for Box<CStr>`,
1912 `From<&OsStr> for Box<OsStr>`,
1913 `From<&Path> for Box<Path>`
1914 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1915 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1916 * [Slightly optimize `slice::sort`][39538]
1917 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1918 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1919 `Box<str>` implements `From<&str>`][39438]
1920 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1921 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1922 * [`format!` estimates the needed capacity before writing a string][39356]
1923 * [Support unprivileged symlink creation in Windows][38921]
1924 * [`PathBuf` implements `Default`][38764]
1925 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1926 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1927 and poor hash functions.
1932 * [Add `cargo check --all`][cargo/3731]
1933 * [Add an option to ignore SSL revocation checking][cargo/3699]
1934 * [Add `cargo run --package`][cargo/3691]
1935 * [Add `required_features`][cargo/3667]
1936 * [Assume `build.rs` is a build script][cargo/3664]
1937 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1942 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1944 * [The "Unstable Book" documents nightly-only features][ubook]
1945 * [Improve the style of the sidebar in rustdoc output][40265]
1946 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1947 * [Fix MSP430 breakage due to `i128`][40257]
1948 * [Preliminary Solaris/SPARCv9 support][39903]
1949 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1950 run without installing the MSVC runtime.
1951 * [`rustdoc --test` includes file names in test names][39788]
1952 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1953 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1954 * [Initial support for `aarch64-unknown-freebsd`][39491]
1955 * [Initial support for `i686-unknown-netbsd`][39426]
1956 * [This release no longer includes the old makefile build system][39431]. Rust
1957 is built with a custom build system, written in Rust, and with Cargo.
1958 * [Add Debug implementations for libcollection structs][39002]
1959 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1960 * [`--test-threads=0` produces an error][38945]
1961 * [`rustup` installs documentation by default][40526]
1962 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1963 WinDbg and Visual Studio to improve the debugging experience.
1968 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1969 workaround, either use MSVC 2015 or run vcvars.bat.
1970 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1971 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1972 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1974 * [`format!` and `Display::to_string` panic if an underlying formatting
1975 implementation returns an error][40117]. Previously the error was silently
1976 ignored. It is incorrect for `write_fmt` to return an error when writing
1978 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1979 crates were marked stable and could be accessed from the stable toolchain.
1980 * [Rust git source no longer includes vendored crates][39728]. Those that need
1981 to build with vendored crates should build from release tarballs.
1982 * [Fix inert attributes from `proc_macro_derives`][39572]
1983 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1984 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1986 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1987 existing code generally ignores the type of dead-code unless a type-hint is
1988 provided; this can cause surprising inference interactions particularly around
1989 defaulting. The new code uniformly ignores the result type of dead-code.
1990 * [Tuple-struct constructors with private fields are no longer visible][38932]
1991 * [Lifetime parameters that do not appear in the arguments are now considered
1992 early-bound][38897], resolving a soundness bug (#[32330]). The
1993 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1995 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1996 * [Make transmuting from fn item types to pointer-sized types a hard
1999 [27787]: https://github.com/rust-lang/rust/issues/27787
2000 [32330]: https://github.com/rust-lang/rust/issues/32330
2001 [34198]: https://github.com/rust-lang/rust/pull/34198
2002 [38161]: https://github.com/rust-lang/rust/pull/38161
2003 [38368]: https://github.com/rust-lang/rust/pull/38368
2004 [38584]: https://github.com/rust-lang/rust/issues/38584
2005 [38661]: https://github.com/rust-lang/rust/pull/38661
2006 [38764]: https://github.com/rust-lang/rust/pull/38764
2007 [38864]: https://github.com/rust-lang/rust/issues/38864
2008 [38897]: https://github.com/rust-lang/rust/pull/38897
2009 [38921]: https://github.com/rust-lang/rust/pull/38921
2010 [38932]: https://github.com/rust-lang/rust/pull/38932
2011 [38945]: https://github.com/rust-lang/rust/pull/38945
2012 [38981]: https://github.com/rust-lang/rust/pull/38981
2013 [39002]: https://github.com/rust-lang/rust/pull/39002
2014 [39116]: https://github.com/rust-lang/rust/pull/39116
2015 [39193]: https://github.com/rust-lang/rust/pull/39193
2016 [39265]: https://github.com/rust-lang/rust/pull/39265
2017 [39356]: https://github.com/rust-lang/rust/pull/39356
2018 [39372]: https://github.com/rust-lang/rust/pull/39372
2019 [39426]: https://github.com/rust-lang/rust/pull/39426
2020 [39431]: https://github.com/rust-lang/rust/pull/39431
2021 [39438]: https://github.com/rust-lang/rust/pull/39438
2022 [39440]: https://github.com/rust-lang/rust/pull/39440
2023 [39485]: https://github.com/rust-lang/rust/pull/39485
2024 [39491]: https://github.com/rust-lang/rust/pull/39491
2025 [39518]: https://github.com/rust-lang/rust/pull/39518
2026 [39538]: https://github.com/rust-lang/rust/pull/39538
2027 [39572]: https://github.com/rust-lang/rust/pull/39572
2028 [39633]: https://github.com/rust-lang/rust/pull/39633
2029 [39642]: https://github.com/rust-lang/rust/pull/39642
2030 [39728]: https://github.com/rust-lang/rust/pull/39728
2031 [39761]: https://github.com/rust-lang/rust/pull/39761
2032 [39788]: https://github.com/rust-lang/rust/pull/39788
2033 [39793]: https://github.com/rust-lang/rust/pull/39793
2034 [39837]: https://github.com/rust-lang/rust/pull/39837
2035 [39843]: https://github.com/rust-lang/rust/pull/39843
2036 [39851]: https://github.com/rust-lang/rust/pull/39851
2037 [39903]: https://github.com/rust-lang/rust/pull/39903
2038 [39939]: https://github.com/rust-lang/rust/pull/39939
2039 [39953]: https://github.com/rust-lang/rust/pull/39953
2040 [39960]: https://github.com/rust-lang/rust/pull/39960
2041 [39990]: https://github.com/rust-lang/rust/pull/39990
2042 [39995]: https://github.com/rust-lang/rust/pull/39995
2043 [40008]: https://github.com/rust-lang/rust/pull/40008
2044 [40009]: https://github.com/rust-lang/rust/pull/40009
2045 [40027]: https://github.com/rust-lang/rust/pull/40027
2046 [40028]: https://github.com/rust-lang/rust/pull/40028
2047 [40037]: https://github.com/rust-lang/rust/pull/40037
2048 [40117]: https://github.com/rust-lang/rust/pull/40117
2049 [40166]: https://github.com/rust-lang/rust/pull/40166
2050 [40245]: https://github.com/rust-lang/rust/pull/40245
2051 [40257]: https://github.com/rust-lang/rust/pull/40257
2052 [40261]: https://github.com/rust-lang/rust/pull/40261
2053 [40265]: https://github.com/rust-lang/rust/pull/40265
2054 [40319]: https://github.com/rust-lang/rust/pull/40319
2055 [40336]: https://github.com/rust-lang/rust/pull/40336
2056 [40526]: https://github.com/rust-lang/rust/pull/40526
2057 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2058 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2059 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2060 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2061 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2062 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2063 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2064 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2065 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2066 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2067 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2068 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2069 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2070 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2071 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2072 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2073 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2074 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2075 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2076 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2077 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2078 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2079 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2080 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2081 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2082 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2083 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2084 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2085 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2086 [mdbook]: https://crates.io/crates/mdbook
2087 [ubook]: https://doc.rust-lang.org/unstable-book/
2090 Version 1.16.0 (2017-03-16)
2091 ===========================
2096 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2097 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2098 match patterns][38069]
2099 * [Clean up semantics of `self` in an import list][38313]
2100 * [`Self` may appear in `impl` headers][38920]
2101 * [`Self` may appear in struct expressions][39282]
2106 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2107 a `.rmeta` file containing only crate metadata][38571]. This can be
2108 used by tools like the Rust Language Service to perform
2109 metadata-only builds.
2110 * [Levenshtein based typo suggestions now work in most places, while
2111 previously they worked only for fields and sometimes for local
2112 variables][38927]. Together with the overhaul of "no
2113 resolution"/"unexpected resolution" errors (#[38154]) they result in
2114 large and systematic improvement in resolution diagnostics.
2115 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2117 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2118 * [`rustc` no longer attempts to provide "consider using an explicit
2119 lifetime" suggestions][37057]. They were inaccurate.
2124 * [`VecDeque::truncate`]
2125 * [`VecDeque::resize`]
2126 * [`String::insert_str`]
2127 * [`Duration::checked_add`]
2128 * [`Duration::checked_sub`]
2129 * [`Duration::checked_div`]
2130 * [`Duration::checked_mul`]
2133 * [`SocketAddr::is_ipv4`]
2134 * [`SocketAddr::is_ipv6`]
2135 * [`IpAddr::is_ipv4`]
2136 * [`IpAddr::is_ipv6`]
2138 * [`Vec::dedup_by_key`]
2139 * [`Result::unwrap_or_default`]
2140 * [`<*const T>::wrapping_offset`]
2141 * [`<*mut T>::wrapping_offset`]
2142 * `CommandExt::creation_flags`
2143 * [`File::set_permissions`]
2144 * [`String::split_off`]
2149 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2150 their argument by `Borrow` parameter][37761]
2151 * [All public types in std implement `Debug`][38006]
2152 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2153 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2154 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2156 * [std: Fix partial writes in `LineWriter`][38062]
2157 * [std: Clamp max read/write sizes on Unix][38062]
2158 * [Use more specific panic message for `&str` slicing errors][38066]
2159 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2160 functionality cannot be achieved in std currently.
2161 * [`writeln!`, like `println!`, now accepts a form with no string
2162 or formatting arguments, to just print a newline][38469]
2163 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2164 * [Reduce the size of static data in `std_unicode::tables`][38781]
2165 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2166 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2168 * [`Duration` implements `Sum`][38712]
2169 * [`String` implements `ToSocketAddrs`][39048]
2174 * [The `cargo check` command does a type check of a project without
2175 building it][cargo/3296]
2176 * [crates.io will display CI badges from Travis and AppVeyor, if
2177 specified in Cargo.toml][cargo/3546]
2178 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2179 * [Compilation profiles accept integer values for `debug`, in addition
2180 to `true` and `false`. These are passed to `rustc` as the value to
2181 `-C debuginfo`][cargo/3534]
2182 * [Implement `cargo --version --verbose`][cargo/3604]
2183 * [All builds now output 'dep-info' build dependencies compatible with
2184 make and ninja][cargo/3557]
2185 * [Build all workspace members with `build --all`][cargo/3511]
2186 * [Document all workspace members with `doc --all`][cargo/3515]
2187 * [Path deps outside workspace are not members][cargo/3443]
2192 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2193 the path to the Rust implementation][38589]
2194 * [The `armv7-linux-androideabi` target no longer enables NEON
2195 extensions, per Google's ABI guide][38413]
2196 * [The stock standard library can be compiled for Redox OS][38401]
2197 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2199 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2201 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2206 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2207 match patterns][38069]
2208 * In this release, references to uninhabited types can not be
2209 pattern-matched. This was accidentally allowed in 1.15.
2210 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2211 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2213 * [Clean up semantics of `self` in an import list][38313]
2214 * Reimplemented lifetime elision. This change was almost entirely compatible
2215 with existing code, but it did close a number of small bugs and loopholes,
2216 as well as being more accepting in some other [cases][41105].
2218 [37057]: https://github.com/rust-lang/rust/pull/37057
2219 [37761]: https://github.com/rust-lang/rust/pull/37761
2220 [38006]: https://github.com/rust-lang/rust/pull/38006
2221 [38051]: https://github.com/rust-lang/rust/pull/38051
2222 [38062]: https://github.com/rust-lang/rust/pull/38062
2223 [38062]: https://github.com/rust-lang/rust/pull/38622
2224 [38066]: https://github.com/rust-lang/rust/pull/38066
2225 [38069]: https://github.com/rust-lang/rust/pull/38069
2226 [38131]: https://github.com/rust-lang/rust/pull/38131
2227 [38154]: https://github.com/rust-lang/rust/pull/38154
2228 [38274]: https://github.com/rust-lang/rust/pull/38274
2229 [38304]: https://github.com/rust-lang/rust/pull/38304
2230 [38313]: https://github.com/rust-lang/rust/pull/38313
2231 [38314]: https://github.com/rust-lang/rust/pull/38314
2232 [38327]: https://github.com/rust-lang/rust/pull/38327
2233 [38401]: https://github.com/rust-lang/rust/pull/38401
2234 [38413]: https://github.com/rust-lang/rust/pull/38413
2235 [38469]: https://github.com/rust-lang/rust/pull/38469
2236 [38559]: https://github.com/rust-lang/rust/pull/38559
2237 [38571]: https://github.com/rust-lang/rust/pull/38571
2238 [38580]: https://github.com/rust-lang/rust/pull/38580
2239 [38589]: https://github.com/rust-lang/rust/pull/38589
2240 [38670]: https://github.com/rust-lang/rust/pull/38670
2241 [38712]: https://github.com/rust-lang/rust/pull/38712
2242 [38726]: https://github.com/rust-lang/rust/pull/38726
2243 [38781]: https://github.com/rust-lang/rust/pull/38781
2244 [38798]: https://github.com/rust-lang/rust/pull/38798
2245 [38909]: https://github.com/rust-lang/rust/pull/38909
2246 [38920]: https://github.com/rust-lang/rust/pull/38920
2247 [38927]: https://github.com/rust-lang/rust/pull/38927
2248 [39048]: https://github.com/rust-lang/rust/pull/39048
2249 [39282]: https://github.com/rust-lang/rust/pull/39282
2250 [39379]: https://github.com/rust-lang/rust/pull/39379
2251 [41105]: https://github.com/rust-lang/rust/issues/41105
2252 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2253 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2254 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2255 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2256 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2257 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2258 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2259 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2260 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2261 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2262 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2263 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2264 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2265 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2266 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2267 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2268 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2269 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2270 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2271 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2272 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2273 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2274 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2275 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2276 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2277 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2278 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2279 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2280 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2281 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2284 Version 1.15.1 (2017-02-09)
2285 ===========================
2287 * [Fix IntoIter::as_mut_slice's signature][39466]
2288 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2290 [39466]: https://github.com/rust-lang/rust/pull/39466
2291 [39523]: https://github.com/rust-lang/rust/pull/39523
2294 Version 1.15.0 (2017-02-02)
2295 ===========================
2300 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2301 stable. This allows popular code-generating crates like Serde and Diesel to
2302 work ergonomically. [RFC 1681].
2303 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2304 with curly braces][36868]. Part of [RFC 1506].
2305 * [A number of minor changes to name resolution have been activated][37127].
2306 They add up to more consistent semantics, allowing for future evolution of
2307 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2308 details of what is different. The breaking changes here have been transitioned
2309 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2310 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2312 * [`?Sized` can be used in `where` clauses][37791]
2313 * [There is now a limit on the size of monomorphized types and it can be
2314 modified with the `#![type_size_limit]` crate attribute, similarly to
2315 the `#![recursion_limit]` attribute][37789]
2320 * [On Windows, the compiler will apply dllimport attributes when linking to
2321 extern functions][37973]. Additional attributes and flags can control which
2322 library kind is linked and its name. [RFC 1717].
2323 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2324 * [The `--test` flag works with procedural macro crates][38107]
2325 * [Fix `extern "aapcs" fn` ABI][37814]
2326 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2327 * [The `format!` expander recognizes incorrect `printf` and shell-style
2328 formatting directives and suggests the correct format][37613].
2329 * [Only report one error for all unused imports in an import list][37456]
2331 Compiler Performance
2332 --------------------
2334 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2335 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2336 * [Don't clone in `UnificationTable::probe`][37848]
2337 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2338 * [Use small vectors in type walker][37760]
2339 * [Macro expansion performance was improved][37701]
2340 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2341 * [Replace FNV with a faster hash function][37229]
2346 * [`std::iter::Iterator::min_by`]
2347 * [`std::iter::Iterator::max_by`]
2348 * [`std::os::*::fs::FileExt`]
2349 * [`std::sync::atomic::Atomic*::get_mut`]
2350 * [`std::sync::atomic::Atomic*::into_inner`]
2351 * [`std::vec::IntoIter::as_slice`]
2352 * [`std::vec::IntoIter::as_mut_slice`]
2353 * [`std::sync::mpsc::Receiver::try_iter`]
2354 * [`std::os::unix::process::CommandExt::before_exec`]
2355 * [`std::rc::Rc::strong_count`]
2356 * [`std::rc::Rc::weak_count`]
2357 * [`std::sync::Arc::strong_count`]
2358 * [`std::sync::Arc::weak_count`]
2359 * [`std::char::encode_utf8`]
2360 * [`std::char::encode_utf16`]
2361 * [`std::cell::Ref::clone`]
2362 * [`std::io::Take::into_inner`]
2367 * [The standard sorting algorithm has been rewritten for dramatic performance
2368 improvements][38192]. It is a hybrid merge sort, drawing influences from
2369 Timsort. Previously it was a naive merge sort.
2370 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2371 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2373 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2374 and `char_indices().last()`][37882]
2375 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2376 * [Chinese characters display correctly in `fmt::Debug`][37855]
2377 * [Derive `Default` for `Duration`][37699]
2378 * [Support creation of anonymous pipes on WinXP/2k][37677]
2379 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2380 * [Don't pass overlapped handles to processes][38835]
2385 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2386 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2387 should instead check the variable at runtime with `std::env`. That the value
2388 was set at build time was a bug, and incorrect when cross-compiling. This
2389 change is known to cause breakage.
2390 * [Add `--all` flag to `cargo test`][cargo/3221]
2391 * [Compile statically against the MSVC CRT][cargo/3363]
2392 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2393 * [Link OpenSSL statically on OSX][cargo/3311]
2394 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2395 * [Test for bad path overrides with summaries][cargo/3336]
2396 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2397 * [Fix retrying crate downloads for network errors][cargo/3348]
2398 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2399 * [Emit more info on --message-format=json][cargo/3319]
2400 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2401 * [Don't ignore errors in workspace manifest][cargo/3409]
2402 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2407 * [Test runners (binaries built with `--test`) now support a `--list` argument
2408 that lists the tests it contains][38185]
2409 * [Test runners now support a `--exact` argument that makes the test filter
2410 match exactly, instead of matching only a substring of the test name][38181]
2411 * [rustdoc supports a `--playground-url` flag][37763]
2412 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2417 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2418 continue to be used in this release by passing `--disable-rustbuild` to the
2419 configure script, but they will be deleted soon. Note that the new build
2420 system uses a different on-disk layout that will likely affect any scripts
2422 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2424 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2425 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2431 * [A number of minor changes to name resolution have been activated][37127].
2432 They add up to more consistent semantics, allowing for future evolution of
2433 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2434 details of what is different. The breaking changes here have been transitioned
2435 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2436 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2437 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2438 should instead check the variable at runtime with `std::env`. That the value
2439 was set at build time was a bug, and incorrect when cross-compiling. This
2440 change is known to cause breakage.
2441 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2442 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2443 1.10 and is now an error by default. It will become a hard error in the near
2445 * [The semantics relating modules to file system directories are changing in
2446 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2447 lint, which is a warning in this release, and will become a hard error in the
2449 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2450 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2451 the underlying iterator][37834]
2453 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2454 [33685]: https://github.com/rust-lang/rust/issues/33685
2455 [36868]: https://github.com/rust-lang/rust/pull/36868
2456 [37127]: https://github.com/rust-lang/rust/pull/37127
2457 [37229]: https://github.com/rust-lang/rust/pull/37229
2458 [37456]: https://github.com/rust-lang/rust/pull/37456
2459 [37527]: https://github.com/rust-lang/rust/pull/37527
2460 [37602]: https://github.com/rust-lang/rust/pull/37602
2461 [37613]: https://github.com/rust-lang/rust/pull/37613
2462 [37615]: https://github.com/rust-lang/rust/pull/37615
2463 [37636]: https://github.com/rust-lang/rust/pull/37636
2464 [37627]: https://github.com/rust-lang/rust/pull/37627
2465 [37642]: https://github.com/rust-lang/rust/pull/37642
2466 [37677]: https://github.com/rust-lang/rust/pull/37677
2467 [37699]: https://github.com/rust-lang/rust/pull/37699
2468 [37701]: https://github.com/rust-lang/rust/pull/37701
2469 [37705]: https://github.com/rust-lang/rust/pull/37705
2470 [37749]: https://github.com/rust-lang/rust/pull/37749
2471 [37760]: https://github.com/rust-lang/rust/pull/37760
2472 [37763]: https://github.com/rust-lang/rust/pull/37763
2473 [37764]: https://github.com/rust-lang/rust/pull/37764
2474 [37789]: https://github.com/rust-lang/rust/pull/37789
2475 [37791]: https://github.com/rust-lang/rust/pull/37791
2476 [37814]: https://github.com/rust-lang/rust/pull/37814
2477 [37817]: https://github.com/rust-lang/rust/pull/37817
2478 [37834]: https://github.com/rust-lang/rust/pull/37834
2479 [37848]: https://github.com/rust-lang/rust/pull/37848
2480 [37855]: https://github.com/rust-lang/rust/pull/37855
2481 [37882]: https://github.com/rust-lang/rust/pull/37882
2482 [37888]: https://github.com/rust-lang/rust/pull/37888
2483 [37973]: https://github.com/rust-lang/rust/pull/37973
2484 [37979]: https://github.com/rust-lang/rust/pull/37979
2485 [38086]: https://github.com/rust-lang/rust/pull/38086
2486 [38107]: https://github.com/rust-lang/rust/pull/38107
2487 [38117]: https://github.com/rust-lang/rust/pull/38117
2488 [38134]: https://github.com/rust-lang/rust/pull/38134
2489 [38146]: https://github.com/rust-lang/rust/pull/38146
2490 [38181]: https://github.com/rust-lang/rust/pull/38181
2491 [38182]: https://github.com/rust-lang/rust/pull/38182
2492 [38185]: https://github.com/rust-lang/rust/pull/38185
2493 [38192]: https://github.com/rust-lang/rust/pull/38192
2494 [38279]: https://github.com/rust-lang/rust/pull/38279
2495 [38835]: https://github.com/rust-lang/rust/pull/38835
2496 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2497 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2498 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2499 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2500 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2501 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2502 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2503 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2504 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2505 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2506 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2507 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2508 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2509 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2510 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2511 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2512 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2513 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2514 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2515 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2516 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2517 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2518 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2519 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2520 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2521 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2522 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2523 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2524 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2525 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2526 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2527 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2528 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2529 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2530 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2531 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2532 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2533 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2536 Version 1.14.0 (2016-12-22)
2537 ===========================
2542 * [`..` matches multiple tuple fields in enum variants, structs
2543 and tuples][36843]. [RFC 1492].
2544 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2545 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2546 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2547 dereferencing][36822]
2552 * [Mark enums with non-zero discriminant as non-zero][37224]
2553 * [Lower-case `static mut` names are linted like other
2554 statics and consts][37162]
2555 * [Fix ICE on some macros in const integer positions
2556 (e.g. `[u8; m!()]`)][36819]
2557 * [Improve error message and snippet for "did you mean `x`"][36798]
2558 * [Add a panic-strategy field to the target specification][36794]
2559 * [Include LLVM version in `--version --verbose`][37200]
2561 Compile-time Optimizations
2562 --------------------------
2564 * [Improve macro expansion performance][37569]
2565 * [Shrink `Expr_::ExprInlineAsm`][37445]
2566 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2567 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2568 * [Avoid more allocations when compiling html5ever][37373]
2569 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2570 * [Avoid some allocations in the macro parser][37318]
2571 * [Use a faster deflate setting][37298]
2572 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2573 during interning of slices][37270]
2574 * [Optimize `write_metadata`][37267]
2575 * [Don't process obligation forest cycles when stalled][37231]
2576 * [Avoid many `CrateConfig` clones][37161]
2577 * [Optimize `Substs::super_fold_with`][37108]
2578 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2579 * [Speed up `plug_leaks`][36917]
2584 * [`println!()`, with no arguments, prints newline][36825].
2585 Previously, an empty string was required to achieve the same.
2586 * [`Wrapping` impls standard binary and unary operators, as well as
2587 the `Sum` and `Product` iterators][37356]
2588 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2590 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2591 `VecDeque` iterators][37315]
2592 * [Improve `SipHasher` performance on small values][37312]
2593 * [Add Iterator trait TrustedLen to enable better FromIterator /
2595 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2596 * [`ReadDir` implements `Debug`][37221]
2597 * [Implement `RefUnwindSafe` for atomic types][37178]
2598 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2599 * [Avoid allocations in `Decoder::read_str`][37064]
2600 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2601 * [Impl `Debug` for raw pointers to unsized data][36880]
2602 * [Don't reuse `HashMap` random seeds][37470]
2603 * [The internal memory layout of `HashMap` is more cache-friendly, for
2604 significant improvements in some operations][36692]
2605 * [`HashMap` uses less memory on 32-bit architectures][36595]
2606 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2611 * [Expose rustc cfg values to build scripts][cargo/3243]
2612 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2613 * [Fix passing --features when testing multiple packages][cargo/3280]
2614 * [Use a single profile set per workspace][cargo/3249]
2615 * [Load `replace` sections from lock files][cargo/3220]
2616 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2621 * [rustup is the recommended Rust installation method][1.14rustup]
2622 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2623 S390x. These are [tier 2] platforms and may have major defects. Follow the
2624 instructions on the website to install, or add the targets to an existing
2625 installation with `rustup target add`. The new target triples are:
2626 - `mips-unknown-linux-gnu`
2627 - `mipsel-unknown-linux-gnu`
2628 - `mips64-unknown-linux-gnuabi64`
2629 - `mips64el-unknown-linux-gnuabi64 `
2630 - `powerpc-unknown-linux-gnu`
2631 - `powerpc64-unknown-linux-gnu`
2632 - `powerpc64le-unknown-linux-gnu`
2633 - `s390x-unknown-linux-gnu `
2634 * This release includes target (std) builds for ARM Linux running MUSL
2635 libc. These are [tier 2] platforms and may have major defects. Add the
2636 following triples to an existing rustup installation with `rustup target add`:
2637 - `arm-unknown-linux-musleabi`
2638 - `arm-unknown-linux-musleabihf`
2639 - `armv7-unknown-linux-musleabihf`
2640 * This release includes [experimental support for WebAssembly][1.14wasm], via
2641 the `wasm32-unknown-emscripten` target. This target is known to have major
2642 defects. Please test, report, and fix.
2643 * rustup no longer installs documentation by default. Run `rustup
2644 component add rust-docs` to install.
2645 * [Fix line stepping in debugger][37310]
2646 * [Enable line number debuginfo in releases][37280]
2651 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2652 * [Add support for Fuchsia OS][37313]
2653 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2658 * [A number of forward-compatibility lints used by the compiler
2659 to gradually introduce language changes have been converted
2660 to deny by default][36894]:
2661 - ["use of inaccessible extern crate erroneously allowed"][36886]
2662 - ["type parameter default erroneously allowed in invalid location"][36887]
2663 - ["detects super or self keywords at the beginning of global path"][36888]
2664 - ["two overlapping inherent impls define an item with the same name
2665 were erroneously allowed"][36889]
2666 - ["floating-point constants cannot be used in patterns"][36890]
2667 - ["constants of struct or enum type can only be used in a pattern if
2668 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2669 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2670 * [Prohibit patterns in trait methods without bodies][37378]
2671 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2672 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2673 * [The `$crate` macro variable is accepted in fewer locations][37213]
2674 * [Impls specifying extra region requirements beyond the trait
2675 they implement are rejected][37167]
2676 * [Enums may not be unsized][37111]. Unsized enums are intended to
2677 work but never have. For now they are forbidden.
2678 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2680 [tier 2]: https://forge.rust-lang.org/platform-support.html
2681 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2682 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2683 [36430]: https://github.com/rust-lang/rust/pull/36430
2684 [36595]: https://github.com/rust-lang/rust/pull/36595
2685 [36595]: https://github.com/rust-lang/rust/pull/36595
2686 [36692]: https://github.com/rust-lang/rust/pull/36692
2687 [36767]: https://github.com/rust-lang/rust/pull/36767
2688 [36794]: https://github.com/rust-lang/rust/pull/36794
2689 [36798]: https://github.com/rust-lang/rust/pull/36798
2690 [36819]: https://github.com/rust-lang/rust/pull/36819
2691 [36822]: https://github.com/rust-lang/rust/pull/36822
2692 [36825]: https://github.com/rust-lang/rust/pull/36825
2693 [36843]: https://github.com/rust-lang/rust/pull/36843
2694 [36880]: https://github.com/rust-lang/rust/pull/36880
2695 [36886]: https://github.com/rust-lang/rust/issues/36886
2696 [36887]: https://github.com/rust-lang/rust/issues/36887
2697 [36888]: https://github.com/rust-lang/rust/issues/36888
2698 [36889]: https://github.com/rust-lang/rust/issues/36889
2699 [36890]: https://github.com/rust-lang/rust/issues/36890
2700 [36891]: https://github.com/rust-lang/rust/issues/36891
2701 [36892]: https://github.com/rust-lang/rust/issues/36892
2702 [36894]: https://github.com/rust-lang/rust/pull/36894
2703 [36917]: https://github.com/rust-lang/rust/pull/36917
2704 [36993]: https://github.com/rust-lang/rust/pull/36993
2705 [37037]: https://github.com/rust-lang/rust/pull/37037
2706 [37064]: https://github.com/rust-lang/rust/pull/37064
2707 [37094]: https://github.com/rust-lang/rust/pull/37094
2708 [37108]: https://github.com/rust-lang/rust/pull/37108
2709 [37111]: https://github.com/rust-lang/rust/pull/37111
2710 [37161]: https://github.com/rust-lang/rust/pull/37161
2711 [37162]: https://github.com/rust-lang/rust/pull/37162
2712 [37167]: https://github.com/rust-lang/rust/pull/37167
2713 [37178]: https://github.com/rust-lang/rust/pull/37178
2714 [37200]: https://github.com/rust-lang/rust/pull/37200
2715 [37213]: https://github.com/rust-lang/rust/pull/37213
2716 [37221]: https://github.com/rust-lang/rust/pull/37221
2717 [37224]: https://github.com/rust-lang/rust/pull/37224
2718 [37230]: https://github.com/rust-lang/rust/pull/37230
2719 [37231]: https://github.com/rust-lang/rust/pull/37231
2720 [37247]: https://github.com/rust-lang/rust/pull/37247
2721 [37267]: https://github.com/rust-lang/rust/pull/37267
2722 [37270]: https://github.com/rust-lang/rust/pull/37270
2723 [37273]: https://github.com/rust-lang/rust/pull/37273
2724 [37280]: https://github.com/rust-lang/rust/pull/37280
2725 [37298]: https://github.com/rust-lang/rust/pull/37298
2726 [37306]: https://github.com/rust-lang/rust/pull/37306
2727 [37310]: https://github.com/rust-lang/rust/pull/37310
2728 [37312]: https://github.com/rust-lang/rust/pull/37312
2729 [37313]: https://github.com/rust-lang/rust/pull/37313
2730 [37315]: https://github.com/rust-lang/rust/pull/37315
2731 [37318]: https://github.com/rust-lang/rust/pull/37318
2732 [37322]: https://github.com/rust-lang/rust/pull/37322
2733 [37326]: https://github.com/rust-lang/rust/pull/37326
2734 [37351]: https://github.com/rust-lang/rust/pull/37351
2735 [37356]: https://github.com/rust-lang/rust/pull/37356
2736 [37367]: https://github.com/rust-lang/rust/pull/37367
2737 [37373]: https://github.com/rust-lang/rust/pull/37373
2738 [37378]: https://github.com/rust-lang/rust/pull/37378
2739 [37389]: https://github.com/rust-lang/rust/pull/37389
2740 [37392]: https://github.com/rust-lang/rust/pull/37392
2741 [37427]: https://github.com/rust-lang/rust/pull/37427
2742 [37439]: https://github.com/rust-lang/rust/pull/37439
2743 [37445]: https://github.com/rust-lang/rust/pull/37445
2744 [37470]: https://github.com/rust-lang/rust/pull/37470
2745 [37569]: https://github.com/rust-lang/rust/pull/37569
2746 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2747 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2748 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2749 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2750 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2751 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2752 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2755 Version 1.13.0 (2016-11-10)
2756 ===========================
2761 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2762 errors, like the `try!` macro, described in [RFC 0243].
2763 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2764 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2765 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2766 * [Fix lifetime rules for 'if' conditions][36029]
2767 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2772 * [Add the `-C link-arg` argument][36574]
2773 * [Remove the old AST-based backend from rustc_trans][35764]
2774 * [Don't enable NEON by default on armv7 Linux][35814]
2775 * [Fix debug line number info for macro expansions][35238]
2776 * [Do not emit "class method" debuginfo for types that are not
2777 DICompositeType][36008]
2778 * [Warn about multiple conflicting #[repr] hints][34623]
2779 * [When sizing DST, don't double-count nested struct prefixes][36351]
2780 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2781 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2782 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2783 * [Expand macros without recursing to avoid stack overflows][36214]
2788 * [Replace macro backtraces with labeled local uses][35702]
2789 * [Improve error message for misplaced doc comments][33922]
2790 * [Buffer unix and lock windows to prevent message interleaving][35975]
2791 * [Update lifetime errors to specifically note temporaries][36171]
2792 * [Special case a few colors for Windows][36178]
2793 * [Suggest `use self` when such an import resolves][36289]
2794 * [Be more specific when type parameter shadows primitive type][36338]
2795 * Many minor improvements
2797 Compile-time Optimizations
2798 --------------------------
2800 * [Compute and cache HIR hashes at beginning][35854]
2801 * [Don't hash types in loan paths][36004]
2802 * [Cache projections in trans][35761]
2803 * [Optimize the parser's last token handling][36527]
2804 * [Only instantiate #[inline] functions in codegen units referencing
2805 them][36524]. This leads to big improvements in cases where crates export
2806 define many inline functions without using them directly.
2807 * [Lazily allocate TypedArena's first chunk][36592]
2808 * [Don't allocate during default HashSet creation][36734]
2815 * [`overflowing_abs`]
2816 * [`RefCell::try_borrow`]
2817 * [`RefCell::try_borrow_mut`]
2822 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2823 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2825 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2826 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2827 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2828 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2829 * [Use arc4rand on FreeBSD][35884]
2830 * [memrchr: Correct aligned offset computation][35969]
2831 * [Improve Demangling of Rust Symbols][36059]
2832 * [Use monotonic time in condition variables][35048]
2833 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2834 * [Implement conversion traits for `char`][35755]
2835 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2836 * [Zero first byte of CString on drop][36264]
2837 * [Inherit overflow checks for sum and product][36372]
2838 * [Add missing Eq implementations][36423]
2839 * [Implement `Debug` for `DirEntry`][36631]
2840 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2842 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2843 * [Implement more traits for `std::io::ErrorKind`][35911]
2844 * [Optimize BinaryHeap bounds checking][36072]
2845 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2846 `extend_with_element`][36355]
2847 * [Fix overflow checking in unsigned pow()][34942]
2852 * This release includes security fixes to both curl and OpenSSL.
2853 * [Fix transitive doctests when panic=abort][cargo/3021]
2854 * [Add --all-features flag to cargo][cargo/3038]
2855 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2856 * [Don't parse the home directory more than once][cargo/3078]
2857 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2858 * [Update OpenSSL to 1.0.2j][cargo/3121]
2859 * [Add license and license_file to cargo metadata output][cargo/3110]
2860 * [Make crates-io registry URL optional in config; ignore all changes to
2861 source.crates-io][cargo/3089]
2862 * [Don't download dependencies from other platforms][cargo/3123]
2863 * [Build transitive dev-dependencies when needed][cargo/3125]
2864 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2865 * [Avoid updating registry when adding existing deps][cargo/3144]
2866 * [Warn about path overrides that won't work][cargo/3136]
2867 * [Use workspaces during `cargo install`][cargo/3146]
2868 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2869 * [Add --message-format flag][cargo/3000]
2870 * [Pass target environment for rustdoc][cargo/3205]
2871 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2872 * [Update curl and curl-sys][cargo/3241]
2873 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2878 * [rustdoc: Add the `--sysroot` argument][36586]
2879 * [rustdoc: Fix a couple of issues with the search results][35655]
2880 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2881 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2882 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2887 * [Remove unmaintained style guide][35124]
2888 * [Add s390x support][36369]
2889 * [Initial work at Haiku OS support][36727]
2890 * [Add mips-uclibc targets][35734]
2891 * [Crate-ify compiler-rt into compiler-builtins][35021]
2892 * [Add rustc version info (git hash + date) to dist tarball][36213]
2893 * Many documentation improvements
2898 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2899 * [Deny (by default) transmuting from fn item types to pointer-sized
2900 types][34923]. Continuing the long transition to zero-sized fn items,
2902 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2904 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2905 * [Fix lifetime rules for 'if' conditions][36029].
2906 * [Inherit overflow checks for sum and product][36372].
2907 * [Forbid user-defined macros named "macro_rules"][36730].
2909 [33922]: https://github.com/rust-lang/rust/pull/33922
2910 [34623]: https://github.com/rust-lang/rust/pull/34623
2911 [34923]: https://github.com/rust-lang/rust/pull/34923
2912 [34942]: https://github.com/rust-lang/rust/pull/34942
2913 [34982]: https://github.com/rust-lang/rust/pull/34982
2914 [35021]: https://github.com/rust-lang/rust/pull/35021
2915 [35048]: https://github.com/rust-lang/rust/pull/35048
2916 [35074]: https://github.com/rust-lang/rust/pull/35074
2917 [35124]: https://github.com/rust-lang/rust/pull/35124
2918 [35234]: https://github.com/rust-lang/rust/pull/35234
2919 [35238]: https://github.com/rust-lang/rust/pull/35238
2920 [35354]: https://github.com/rust-lang/rust/pull/35354
2921 [35559]: https://github.com/rust-lang/rust/pull/35559
2922 [35585]: https://github.com/rust-lang/rust/pull/35585
2923 [35627]: https://github.com/rust-lang/rust/pull/35627
2924 [35655]: https://github.com/rust-lang/rust/pull/35655
2925 [35702]: https://github.com/rust-lang/rust/pull/35702
2926 [35707]: https://github.com/rust-lang/rust/pull/35707
2927 [35728]: https://github.com/rust-lang/rust/pull/35728
2928 [35734]: https://github.com/rust-lang/rust/pull/35734
2929 [35755]: https://github.com/rust-lang/rust/pull/35755
2930 [35761]: https://github.com/rust-lang/rust/pull/35761
2931 [35764]: https://github.com/rust-lang/rust/pull/35764
2932 [35814]: https://github.com/rust-lang/rust/pull/35814
2933 [35854]: https://github.com/rust-lang/rust/pull/35854
2934 [35871]: https://github.com/rust-lang/rust/pull/35871
2935 [35884]: https://github.com/rust-lang/rust/pull/35884
2936 [35911]: https://github.com/rust-lang/rust/pull/35911
2937 [35969]: https://github.com/rust-lang/rust/pull/35969
2938 [35975]: https://github.com/rust-lang/rust/pull/35975
2939 [36004]: https://github.com/rust-lang/rust/pull/36004
2940 [36008]: https://github.com/rust-lang/rust/pull/36008
2941 [36014]: https://github.com/rust-lang/rust/pull/36014
2942 [36029]: https://github.com/rust-lang/rust/pull/36029
2943 [36059]: https://github.com/rust-lang/rust/pull/36059
2944 [36072]: https://github.com/rust-lang/rust/pull/36072
2945 [36101]: https://github.com/rust-lang/rust/pull/36101
2946 [36104]: https://github.com/rust-lang/rust/pull/36104
2947 [36171]: https://github.com/rust-lang/rust/pull/36171
2948 [36173]: https://github.com/rust-lang/rust/pull/36173
2949 [36178]: https://github.com/rust-lang/rust/pull/36178
2950 [36213]: https://github.com/rust-lang/rust/pull/36213
2951 [36214]: https://github.com/rust-lang/rust/pull/36214
2952 [36264]: https://github.com/rust-lang/rust/pull/36264
2953 [36266]: https://github.com/rust-lang/rust/pull/36266
2954 [36289]: https://github.com/rust-lang/rust/pull/36289
2955 [36338]: https://github.com/rust-lang/rust/pull/36338
2956 [36351]: https://github.com/rust-lang/rust/pull/36351
2957 [36355]: https://github.com/rust-lang/rust/pull/36355
2958 [36369]: https://github.com/rust-lang/rust/pull/36369
2959 [36372]: https://github.com/rust-lang/rust/pull/36372
2960 [36423]: https://github.com/rust-lang/rust/pull/36423
2961 [36482]: https://github.com/rust-lang/rust/pull/36482
2962 [36505]: https://github.com/rust-lang/rust/pull/36505
2963 [36524]: https://github.com/rust-lang/rust/pull/36524
2964 [36527]: https://github.com/rust-lang/rust/pull/36527
2965 [36551]: https://github.com/rust-lang/rust/pull/36551
2966 [36574]: https://github.com/rust-lang/rust/pull/36574
2967 [36586]: https://github.com/rust-lang/rust/pull/36586
2968 [36592]: https://github.com/rust-lang/rust/pull/36592
2969 [36631]: https://github.com/rust-lang/rust/pull/36631
2970 [36639]: https://github.com/rust-lang/rust/pull/36639
2971 [36721]: https://github.com/rust-lang/rust/pull/36721
2972 [36727]: https://github.com/rust-lang/rust/pull/36727
2973 [36730]: https://github.com/rust-lang/rust/pull/36730
2974 [36734]: https://github.com/rust-lang/rust/pull/36734
2975 [36754]: https://github.com/rust-lang/rust/pull/36754
2976 [36995]: https://github.com/rust-lang/rust/pull/36995
2977 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2978 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2979 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2980 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2981 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2982 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2983 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2984 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2985 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2986 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2987 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2988 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2989 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2990 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2991 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2992 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2993 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2994 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2995 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2996 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2997 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2998 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2999 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3000 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3001 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3002 [rustup]: https://www.rustup.rs
3003 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3004 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3005 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3006 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3007 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3008 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3009 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3012 Version 1.12.1 (2016-10-20)
3013 ===========================
3018 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3019 * [Confusion with double negation and booleans][36856]
3020 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3021 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3022 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3023 * [Corrupted memory after updated to 1.12][36936]
3024 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3025 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3026 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3028 [36381]: https://github.com/rust-lang/rust/issues/36381
3029 [36856]: https://github.com/rust-lang/rust/issues/36856
3030 [36875]: https://github.com/rust-lang/rust/issues/36875
3031 [36924]: https://github.com/rust-lang/rust/issues/36924
3032 [36926]: https://github.com/rust-lang/rust/issues/36926
3033 [36936]: https://github.com/rust-lang/rust/issues/36936
3034 [37026]: https://github.com/rust-lang/rust/issues/37026
3035 [37112]: https://github.com/rust-lang/rust/issues/37112
3036 [37153]: https://github.com/rust-lang/rust/issues/37153
3039 Version 1.12.0 (2016-09-29)
3040 ===========================
3045 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3046 This translation pass is far simpler than the previous AST->LLVM pass, and
3047 creates opportunities to perform new optimizations directly on the MIR. It
3048 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3049 * [`rustc` presents a new, more readable error format, along with
3050 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3051 Most common editors supporting Rust have been updated to work with it. It was
3052 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3057 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3058 This translation pass is far simpler than the previous AST->LLVM pass, and
3059 creates opportunities to perform new optimizations directly on the MIR. It
3060 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3061 * [Print the Rust target name, not the LLVM target name, with
3062 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3063 * [The computation of `TypeId` is correct in some cases where it was previously
3064 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3065 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3066 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3067 `--print relocation-models`, and `--print code-models` print the available
3068 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3069 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3070 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3071 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3072 These targets produce statically-linked binaries. There are no binary release
3078 * [`rustc` presents a new, more readable error format, along with
3079 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3080 Most common editors supporting Rust have been updated to work with it. It was
3081 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3082 * [In error descriptions, references are now described in plain English,
3083 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3084 * [In error type descriptions, unknown numeric types are named `{integer}` or
3085 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3086 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3091 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3092 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3093 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3094 useful](https://github.com/rust-lang/rust/pull/34908)
3095 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3096 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3097 * [Semicolons are properly required as statement delimiters inside
3098 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3099 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3104 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3105 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3106 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3107 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3108 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3109 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3110 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3111 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3112 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3113 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3114 Both on Unix and Windows.
3115 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3116 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3117 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3118 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3119 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3120 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3121 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3122 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3127 * [The `format!` macro and friends now allow a single argument to be formatted
3128 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3129 * [The lifetime bounds on `[T]::binary_search_by` and
3130 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3131 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3132 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3133 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3134 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3135 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3136 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3137 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3138 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3139 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3140 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3141 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3142 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3143 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3144 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3145 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3146 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3147 * [`mpsc::sync_channel` `Receiver`s return any available message before
3148 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3149 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3150 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3155 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3156 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3157 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3158 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3159 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3160 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3161 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3162 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3163 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3164 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3165 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3166 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3167 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3168 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3169 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3170 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3175 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3176 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3181 * [Test binaries now support a `--test-threads` argument to specify the number
3182 of threads used to run tests, and which acts the same as the
3183 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3184 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3185 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3186 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3187 * [Rust releases now come with source packages that can be installed by rustup
3188 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3189 The resulting source code can be used by tools and IDES, located in the
3190 sysroot under `lib/rustlib/src`.
3195 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3196 * Many minor improvements to the documentation.
3197 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3202 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3203 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3204 * [When formatting strings, if "precision" is specified, the "fill",
3205 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3206 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3209 Version 1.11.0 (2016-08-18)
3210 ===========================
3215 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3216 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3217 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3218 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3219 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3224 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3225 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3226 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3227 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3228 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3229 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3230 (in libcore - previously stabilized in libstd)
3231 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3232 (in libcore - previously stabilized in libstd)
3233 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3234 (in libcore - previously stabilized in libstd)
3235 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3236 (in libcore - previously stabilized in libstd)
3237 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3238 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3239 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3240 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3245 * [The `thread_local!` macro supports multiple definitions in a single
3246 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3247 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3248 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3249 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3250 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3251 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3252 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3253 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3258 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3259 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3260 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3261 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3262 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3263 and `-vv` prints warnings for all crates.
3264 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3265 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3266 This provides room for expansion by arbitrary tools.
3267 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3268 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3269 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3270 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3271 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3272 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3273 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3278 * [Caching projections speeds up type check dramatically for some
3279 workloads](https://github.com/rust-lang/rust/pull/33816)
3280 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3281 This hasher is faster, but is believed to provide sufficient
3282 protection from collision attacks.
3283 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3288 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3289 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3290 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3291 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3292 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3297 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3298 * [When emitting debug info, rustc emits frame pointers for closures,
3299 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3300 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3301 * Many more errors have been given error codes and extended
3303 * API documentation continues to be improved, with many new examples
3308 * [rustc no longer hangs when dependencies recursively re-export
3309 submodules](https://github.com/rust-lang/rust/pull/34542)
3310 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3311 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3312 rewritten](https://github.com/rust-lang/rust/pull/33895)
3313 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3314 No targets use this yet, but it works toward AVR support.
3319 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3320 * [The new follow-set rules that place restrictions on `macro_rules!`
3321 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3322 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3323 and has been a warning since 1.10.
3324 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3325 This causes breakage in some corner cases.
3328 Version 1.10.0 (2016-07-07)
3329 ===========================
3334 * [Allow `concat_idents!` in type positions as well as in expression
3335 positions](https://github.com/rust-lang/rust/pull/33735).
3336 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3337 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3338 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3339 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3340 * [`panic!` can be converted to a runtime abort with the
3341 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3342 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3343 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3344 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3345 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3346 Note that Cargo does not yet directly support cdylibs.
3351 * `os::windows::fs::OpenOptionsExt::access_mode`
3352 * `os::windows::fs::OpenOptionsExt::share_mode`
3353 * `os::windows::fs::OpenOptionsExt::custom_flags`
3354 * `os::windows::fs::OpenOptionsExt::attributes`
3355 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3356 * `os::unix::fs::OpenOptionsExt::custom_flags`
3357 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3358 * `Default for sync::Weak`
3359 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3360 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3361 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3362 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3363 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3364 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3365 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3366 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3367 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3368 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3369 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3370 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3371 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3372 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3373 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3374 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3375 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3376 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3377 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3378 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3379 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3380 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3381 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3382 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3383 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3384 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3385 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3386 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3387 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3388 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3389 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3390 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3391 * Read/Write/RawFd impls for `UnixStream`
3392 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3393 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3394 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3395 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3396 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3397 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3398 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3399 * RawFd impls for `UnixListener`
3400 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3401 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3402 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3403 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3404 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3405 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3406 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3407 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3408 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3409 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3410 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3411 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3412 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3413 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3414 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3415 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3416 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3417 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3418 * RawFd impls for `UnixDatagram`
3419 * `{BTree,Hash}Map::values_mut`
3420 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3425 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3426 The semantics of this minor method are subtle and probably not what
3428 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3429 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3430 will fall back to `/dev/urandom` temporarily to avoid blocking
3431 during early boot](https://github.com/rust-lang/rust/pull/33086).
3432 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3433 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3434 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3435 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3436 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3437 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3438 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3442 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3443 This controls the runtime behavior of the `panic!` macro
3444 and can be either "unwind" (the default), or "abort".
3445 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3446 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3447 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3448 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3449 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3450 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3451 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3452 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3453 By default they are retried twice, which can be customized with the
3454 `net.retry` value in `.cargo/config`.
3455 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3456 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3457 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3458 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3459 Makes it possible to install multiple crates in parallel.
3460 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3461 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3462 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3463 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3464 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3465 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3470 * [rustc memory usage was reduced by refactoring the context used for
3471 type checking](https://github.com/rust-lang/rust/pull/33425).
3472 * [Speed up creation of `HashMap`s by caching the random keys used
3473 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3474 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3475 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3476 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3477 10x faster than the previous lookup tables.
3478 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3483 * Many incremental improvements to documentation and rustdoc.
3484 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3485 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3486 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3487 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3488 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3489 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3490 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3495 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3496 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3497 * [`std` no longer prints backtraces on platforms where the running
3498 module must be loaded with `env::current_exe`, which can't be relied
3499 on](https://github.com/rust-lang/rust/pull/33554).
3500 * This release includes std binaries for the i586-unknown-linux-gnu,
3501 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3502 i586 target is for old x86 hardware without SSE2, and the armv7
3503 target is for Android running on modern ARM architectures.
3504 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3505 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3506 * [On Unix the runtime aborts by calling `libc::abort` instead of
3507 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3508 * [Rust is now bootstrapped from the previous release of Rust,
3509 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3514 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3515 * [`target_env` for Linux ARM targets is just `gnu`, not
3516 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3517 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3518 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3519 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3520 Affects how macros are parsed.
3521 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3522 * [Feature-gated attributes on macro-generated macro invocations are
3523 now rejected](https://github.com/rust-lang/rust/pull/32791).
3524 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3525 This caused some minor changes to type inference.
3528 Version 1.9.0 (2016-05-26)
3529 ==========================
3534 * The `#[deprecated]` attribute when applied to an API will generate
3535 warnings when used. The warnings may be suppressed with
3536 `#[allow(deprecated)]`. [RFC 1270].
3537 * [`fn` item types are zero sized, and each `fn` names a unique
3538 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3539 `transmute` on a `fn` type will generate a warning for a few cycles,
3540 then will be converted to an error.
3541 * [Field and method resolution understand visibility, so private
3542 fields and methods cannot prevent the proper use of public fields
3543 and methods][1.9fv].
3544 * [The parser considers unicode codepoints in the
3545 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3551 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3552 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3553 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3554 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3555 * [`str::is_char_boundary`]
3556 * [`<*const T>::as_ref`]
3557 * [`<*mut T>::as_ref`]
3558 * [`<*mut T>::as_mut`]
3559 * [`AsciiExt::make_ascii_uppercase`]
3560 * [`AsciiExt::make_ascii_lowercase`]
3561 * [`char::decode_utf16`]
3562 * [`char::DecodeUtf16`]
3563 * [`char::DecodeUtf16Error`]
3564 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3565 * [`BTreeSet::take`]
3566 * [`BTreeSet::replace`]
3569 * [`HashSet::replace`]
3571 * [`OsString::with_capacity`]
3572 * [`OsString::clear`]
3573 * [`OsString::capacity`]
3574 * [`OsString::reserve`]
3575 * [`OsString::reserve_exact`]
3576 * [`OsStr::is_empty`]
3578 * [`std::os::unix::thread`]
3581 * [`JoinHandleExt::as_pthread_t`]
3582 * [`JoinHandleExt::into_pthread_t`]
3583 * [`HashSet::hasher`]
3584 * [`HashMap::hasher`]
3585 * [`CommandExt::exec`]
3586 * [`File::try_clone`]
3587 * [`SocketAddr::set_ip`]
3588 * [`SocketAddr::set_port`]
3589 * [`SocketAddrV4::set_ip`]
3590 * [`SocketAddrV4::set_port`]
3591 * [`SocketAddrV6::set_ip`]
3592 * [`SocketAddrV6::set_port`]
3593 * [`SocketAddrV6::set_flowinfo`]
3594 * [`SocketAddrV6::set_scope_id`]
3595 * [`slice::copy_from_slice`]
3596 * [`ptr::read_volatile`]
3597 * [`ptr::write_volatile`]
3598 * [`OpenOptions::create_new`]
3599 * [`TcpStream::set_nodelay`]
3600 * [`TcpStream::nodelay`]
3601 * [`TcpStream::set_ttl`]
3602 * [`TcpStream::ttl`]
3603 * [`TcpStream::set_only_v6`]
3604 * [`TcpStream::only_v6`]
3605 * [`TcpStream::take_error`]
3606 * [`TcpStream::set_nonblocking`]
3607 * [`TcpListener::set_ttl`]
3608 * [`TcpListener::ttl`]
3609 * [`TcpListener::set_only_v6`]
3610 * [`TcpListener::only_v6`]
3611 * [`TcpListener::take_error`]
3612 * [`TcpListener::set_nonblocking`]
3613 * [`UdpSocket::set_broadcast`]
3614 * [`UdpSocket::broadcast`]
3615 * [`UdpSocket::set_multicast_loop_v4`]
3616 * [`UdpSocket::multicast_loop_v4`]
3617 * [`UdpSocket::set_multicast_ttl_v4`]
3618 * [`UdpSocket::multicast_ttl_v4`]
3619 * [`UdpSocket::set_multicast_loop_v6`]
3620 * [`UdpSocket::multicast_loop_v6`]
3621 * [`UdpSocket::set_multicast_ttl_v6`]
3622 * [`UdpSocket::multicast_ttl_v6`]
3623 * [`UdpSocket::set_ttl`]
3624 * [`UdpSocket::ttl`]
3625 * [`UdpSocket::set_only_v6`]
3626 * [`UdpSocket::only_v6`]
3627 * [`UdpSocket::join_multicast_v4`]
3628 * [`UdpSocket::join_multicast_v6`]
3629 * [`UdpSocket::leave_multicast_v4`]
3630 * [`UdpSocket::leave_multicast_v6`]
3631 * [`UdpSocket::take_error`]
3632 * [`UdpSocket::connect`]
3633 * [`UdpSocket::send`]
3634 * [`UdpSocket::recv`]
3635 * [`UdpSocket::set_nonblocking`]
3640 * [`std::sync::Once` is poisoned if its initialization function
3642 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3643 * [Most types implement `fmt::Debug`][1.9db].
3644 * [The default buffer size used by `BufReader` and `BufWriter` was
3645 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3646 used by other languages.
3647 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3648 `Duration` additionally implements `*=` and `/=`][1.9ta].
3649 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3650 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3651 * [`Chain` implements `BufRead`][1.9ch].
3652 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3657 * [Cargo can now run concurrently][1.9cc].
3658 * [Top-level overrides allow specific revisions of crates to be
3659 overridden through the entire crate graph][1.9ct]. This is intended
3660 to make upgrades easier for large projects, by allowing crates to be
3661 forked temporarily until they've been upgraded and republished.
3662 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3663 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3664 on the commandline][1.9cf]. `rustc` arguments can also be specified
3665 in the `build.rustflags` configuration key.
3670 * [The time complexity of comparing variables for equivalence during type
3671 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3672 to major compilation time improvement in some scenarios.
3673 * [`ToString` is specialized for `str`, giving it the same performance
3674 as `to_owned`][1.9ts].
3675 * [Spawning processes with `Command::output` no longer creates extra
3677 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3678 for C-like enums][1.9cl].
3683 * [Passing the `--quiet` flag to a test runner will produce
3684 much-abbreviated output][1.9q].
3685 * The Rust Project now publishes std binaries for the
3686 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3687 `i586-pc-windows-msvc` targets.
3692 * [`std::sync::Once` is poisoned if its initialization function
3694 * [It is illegal to define methods with the same name in overlapping
3695 inherent `impl` blocks][1.9sn].
3696 * [`fn` item types are zero sized, and each `fn` names a unique
3697 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3698 `transmute` on a `fn` type will generate a warning for a few cycles,
3699 then will be converted to an error.
3700 * [Improvements to const evaluation may trigger new errors when integer
3701 literals are out of range][1.9ce].
3704 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3705 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3706 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3707 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3708 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3709 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3710 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3711 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3712 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3713 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3714 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3715 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3716 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3717 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3718 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3719 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3720 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3721 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3722 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3723 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3724 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3725 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3726 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3727 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3728 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3729 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3730 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3731 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3732 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3733 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3734 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3735 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3736 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3737 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3738 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3739 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3740 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3741 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3742 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3743 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3744 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3745 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3746 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3747 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3748 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3749 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3750 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3751 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3752 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3753 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3754 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3755 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3756 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3757 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3758 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3759 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3760 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3761 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3762 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3763 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3764 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3765 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3766 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3767 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3768 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3769 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3770 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3771 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3772 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3773 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3774 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3775 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3776 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3777 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3778 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3779 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3780 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3781 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3782 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3783 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3784 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3785 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3786 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3787 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3788 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3789 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3790 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3791 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3792 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3793 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3794 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3795 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3796 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3797 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3798 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3799 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3800 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3801 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3802 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3803 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3804 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3805 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3806 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3807 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3808 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3809 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3810 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3811 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3812 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3813 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3816 Version 1.8.0 (2016-04-14)
3817 ==========================
3822 * Rust supports overloading of compound assignment statements like
3823 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3824 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3825 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3827 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3828 addition to the non-braced form, `struct Foo;`. [RFC 218].
3834 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3835 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3838 * [`ptr::drop_in_place`]
3840 * [`time::SystemTime`]
3842 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3843 * [`Instant::elapsed`]
3844 * [`SystemTime::now`]
3845 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3846 * [`SystemTime::elapsed`]
3847 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3848 * [`SystemTimeError`]
3849 * [`SystemTimeError::duration`]
3850 * Various impls for `SystemTimeError`
3852 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3853 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3854 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3855 * [The `write!` and `writeln!` macros correctly emit errors if any of
3856 their arguments can't be formatted][1.8w].
3857 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3858 * [The Unix-specific `raw` modules, which contain a number of
3859 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3860 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3861 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3862 across platforms was making it difficult to implement `std`
3863 correctly. Those that need these definitions should use the `libc`
3865 * The Unix-specific `MetadataExt` traits, including
3866 `os::unix::fs::MetadataExt`, which expose values such as inode
3867 numbers [no longer return platform-specific types][1.8r], but
3868 instead return widened integers. [RFC 1415].
3869 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3870 * [Atomic loads and stores are not volatile][1.8a].
3871 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3876 * [Inlining hash functions lead to a 3% compile-time improvement in
3877 some workloads][1.8h].
3878 * When using jemalloc, its symbols are [unprefixed so that it
3879 overrides the libc malloc implementation][1.8h]. This means that for
3880 rustc, LLVM is now using jemalloc, which results in a 6%
3881 compile-time improvement on a specific workload.
3882 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3887 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3888 i686-pc-windows-msvc is now considered a tier-1 platform.
3889 * [The `--print targets` flag prints a list of supported targets][1.8t].
3890 * [The `--print cfg` flag prints the `cfg`s defined for the current
3892 * [`rustc` can be built with an new Cargo-based build system, written
3893 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3894 build system. To enable it configure with `configure --rustbuild`.
3895 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3896 variants while also indicating the total number of missing variants
3897 if more than 3][1.8m].
3898 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3899 * The Rust Project now publishes binary releases of the standard
3900 library for a number of tier-2 targets:
3901 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3902 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3903 `x86_64-rumprun-netbsd`. These can be installed with
3904 tools such as [multirust][1.8mr].
3909 * [`cargo init` creates a new Cargo project in the current
3910 directory][1.8ci]. It is otherwise like `cargo new`.
3911 * [Cargo has configuration keys for `-v` and
3912 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3913 `[term]` section of `.cargo/config`.
3914 * [Configuration keys that evaluate to strings or integers can be set
3915 via environment variables][1.8ce]. For example the `build.jobs` key
3916 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3917 precedence over config files.
3918 * [Target-specific dependencies support Rust `cfg` syntax for
3919 describing targets][1.8cfg] so that dependencies for multiple
3920 targets can be specified together. [RFC 1361].
3921 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3922 `RUSTDOC` take precedence over the `build.target-dir`,
3923 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3924 * [The child process tree is killed on Windows when Cargo is
3926 * [The `build.target` configuration value sets the target platform,
3927 like `--target`][1.8ct].
3932 * [Unstable compiler flags have been further restricted][1.8u]. Since
3933 1.0 `-Z` flags have been considered unstable, and other flags that
3934 were considered unstable additionally required passing `-Z
3935 unstable-options` to access. Unlike unstable language and library
3936 features though, these options have been accessible on the stable
3937 release channel. Going forward, *new unstable flags will not be
3938 available on the stable release channel*, and old unstable flags
3939 will warn about their usage. In the future, all unstable flags will
3940 be unavailable on the stable release channel.
3941 * [It is no longer possible to `match` on empty enum variants using
3942 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3943 * The Unix-specific `MetadataExt` traits, including
3944 `os::unix::fs::MetadataExt`, which expose values such as inode
3945 numbers [no longer return platform-specific types][1.8r], but
3946 instead return widened integers. [RFC 1415].
3947 * [Modules sourced from the filesystem cannot appear within arbitrary
3948 blocks, but only within other modules][1.8mf].
3949 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3950 * On Unix, [stack overflow triggers a runtime abort instead of a
3952 * [`Command::spawn` and its equivalents return an error if any of
3953 its command-line arguments contain interior `NUL`s][1.8n].
3954 * [Tuple and unit enum variants from other crates are in the type
3956 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3957 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3958 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3959 instead of `foo.lib`.
3962 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3963 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3964 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3965 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3966 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3967 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3968 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3969 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3970 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3971 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3972 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3973 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3974 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3975 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3976 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3977 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3978 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3979 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3980 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3981 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3982 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3983 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3984 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3985 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3986 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3987 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3988 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3989 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3990 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3991 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3992 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3993 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3994 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3995 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3996 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3997 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3998 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3999 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4000 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4001 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4002 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4003 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4004 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4005 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4006 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4007 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4008 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4009 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4010 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4011 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4012 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4013 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4014 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4015 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4016 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4017 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4018 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4019 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4020 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4021 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4024 Version 1.7.0 (2016-03-03)
4025 ==========================
4032 * [`Path::strip_prefix`][] (renamed from relative_from)
4033 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4035 * [`Ipv4Addr::is_loopback`]
4036 * [`Ipv4Addr::is_private`]
4037 * [`Ipv4Addr::is_link_local`]
4038 * [`Ipv4Addr::is_multicast`]
4039 * [`Ipv4Addr::is_broadcast`]
4040 * [`Ipv4Addr::is_documentation`]
4042 * [`Ipv6Addr::is_unspecified`]
4043 * [`Ipv6Addr::is_loopback`]
4044 * [`Ipv6Addr::is_multicast`]
4047 * [`Vec::as_mut_slice`]
4049 * [`String::as_str`]
4050 * [`String::as_mut_str`]
4052 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4054 * `<[T]>::`[`sort_by_key`]
4055 * checked, saturated, and overflowing operations
4056 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4057 * [`i32::saturating_mul`]
4058 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4059 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4060 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4061 * [`u32::saturating_mul`]
4062 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4063 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4064 * and checked, saturated, and overflowing operations for other primitive types
4066 * [`ffi::IntoStringError`]
4067 * [`CString::into_string`]
4068 * [`CString::into_bytes`]
4069 * [`CString::into_bytes_with_nul`]
4070 * `From<CString> for Vec<u8>`
4072 * [`IntoStringError::into_cstring`]
4073 * [`IntoStringError::utf8_error`]
4074 * `Error for IntoStringError`
4076 * [`std::hash::BuildHasher`]
4077 * [`BuildHasher::Hasher`]
4078 * [`BuildHasher::build_hasher`]
4079 * [`std::hash::BuildHasherDefault`]
4080 * [`HashMap::with_hasher`]
4081 * [`HashMap::with_capacity_and_hasher`]
4082 * [`HashSet::with_hasher`]
4083 * [`HashSet::with_capacity_and_hasher`]
4084 * [`std::collections::hash_map::RandomState`]
4085 * [`RandomState::new`]
4086 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4087 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4088 from bytes is faster.
4089 * [The performance of `LineWriter` (and thus `io::stdout`) was
4090 improved by using `memchr` to search for newlines][1.7m].
4091 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4092 `f64` variants were stabilized previously.
4093 * [`BTreeMap` was rewritten to use less memory and improve the performance
4094 of insertion and iteration, the latter by as much as 5x][1.7bm].
4095 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4096 covariant over their contained type][1.7bt].
4097 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4098 over their contained type][1.7ll].
4099 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4101 * [`Any` is implemented for unsized types][1.7a].
4102 * [`Hash` is implemented for `Duration`][1.7h].
4107 * [When running tests with `--test`, rustdoc will pass `--cfg`
4108 arguments to the compiler][1.7dt].
4109 * [The compiler is built with RPATH information by default][1.7rpa].
4110 This means that it will be possible to run `rustc` when installed in
4111 unusual configurations without configuring the dynamic linker search
4113 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4114 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4115 over `LD_LIBRARY_PATH`.
4120 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4121 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4122 * [The `rerun-if-changed` build script directive no longer causes the
4123 build script to incorrectly run twice in certain scenarios][1.7rr].
4128 * Soundness fixes to the interactions between associated types and
4129 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4130 code that violates the new rules. This is a significant change that
4131 is known to break existing code, so it has emitted warnings for the
4132 new error cases since 1.4 to give crate authors time to adapt. The
4133 details of what is changing are subtle; read the RFC for more.
4134 * [Several bugs in the compiler's visibility calculations were
4135 fixed][1.7v]. Since this was found to break significant amounts of
4136 code, the new errors will be emitted as warnings for several release
4137 cycles, under the `private_in_public` lint.
4138 * Defaulted type parameters were accidentally accepted in positions
4139 that were not intended. In this release, [defaulted type parameters
4140 appearing outside of type definitions will generate a
4141 warning][1.7d], which will become an error in future releases.
4142 * [Parsing "." as a float results in an error instead of 0][1.7p].
4143 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4144 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4146 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4147 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4148 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4149 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4150 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4151 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4152 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4153 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4154 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4155 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4156 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4157 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4158 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4159 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4160 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4161 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4162 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4163 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4164 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4165 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4166 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4167 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4168 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4169 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4170 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4171 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4172 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4173 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4174 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4175 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4176 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4177 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4178 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4179 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4180 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4181 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4182 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4183 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4184 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4185 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4186 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4187 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4188 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4189 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4190 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4191 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4192 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4193 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4194 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4195 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4196 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4197 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4198 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4199 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4200 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4201 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4202 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4203 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4204 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4205 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4206 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4207 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4208 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4209 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4210 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4211 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4212 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4213 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4214 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4215 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4216 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4217 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4218 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4219 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4220 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4221 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4222 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4223 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4224 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4227 Version 1.6.0 (2016-01-21)
4228 ==========================
4233 * The `#![no_std]` attribute causes a crate to not be linked to the
4234 standard library, but only the [core library][1.6co], as described
4235 in [RFC 1184]. The core library defines common types and traits but
4236 has no platform dependencies whatsoever, and is the basis for Rust
4237 software in environments that cannot support a full port of the
4238 standard library, such as operating systems. Most of the core
4239 library is now stable.
4245 [`Read::read_exact`],
4246 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4247 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4248 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4249 [`os::unix::fs::DirBuilderExt`],
4250 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4251 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4252 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4253 [`collections::hash_map::Drain`],
4254 [`collections::hash_map::HashMap::drain`],
4255 [`collections::hash_set::Drain`],
4256 [`collections::hash_set::HashSet::drain`],
4257 [`collections::binary_heap::Drain`],
4258 [`collections::binary_heap::BinaryHeap::drain`],
4259 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4260 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4261 [`RwLock::into_inner`],
4262 [`Iterator::min_by_key`][] (renamed from `min_by`),
4263 [`Iterator::max_by_key`][] (renamed from `max_by`).
4264 * The [core library][1.6co] is stable, as are most of its APIs.
4265 * [The `assert_eq!` macro supports arguments that don't implement
4266 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4268 * Several timer functions that take duration in milliseconds [are
4269 deprecated in favor of those that take `Duration`][1.6ms]. These
4270 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4271 `thread::park_timeout_ms`.
4272 * The algorithm by which `Vec` reserves additional elements was
4273 [tweaked to not allocate excessive space][1.6a] while still growing
4275 * `From` conversions are [implemented from integers to floats][1.6f]
4276 in cases where the conversion is lossless. Thus they are not
4277 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4278 or `f64`. They are also not implemented for `isize` and `usize`
4279 because the implementations would be platform-specific. `From` is
4280 also implemented from `f32` to `f64`.
4281 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4282 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4283 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4284 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4286 * Sorting slices that are already sorted [is 50% faster in some
4292 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4293 * Cargo build scripts can specify their dependencies by emitting the
4294 [`rerun-if-changed`][1.6rr] key.
4295 * crates.io will reject publication of crates with dependencies that
4296 have a wildcard version constraint. Crates with wildcard
4297 dependencies were seen to cause a variety of problems, as described
4298 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4300 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4301 release folder. A variety of artifacts that Cargo failed to clean
4302 are now correctly deleted.
4307 * The `unreachable_code` lint [warns when a function call's argument
4309 * The parser indicates [failures that may be caused by
4310 confusingly-similar Unicode characters][1.6uc]
4311 * Certain macro errors [are reported at definition time][1.6m], not
4317 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4318 environment variable when locating crates. This was a pre-cargo
4319 feature for integrating with the package manager that was
4320 accidentally never removed.
4321 * [A number of bugs were fixed in the privacy checker][1.6p] that
4322 could cause previously-accepted code to break.
4323 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4324 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4325 struct pattern syntax (`Foo(..)`) can no longer be used to match
4326 unit structs. This is a warning now, but will become an error in
4327 future releases. Patterns that share the same name as a const are
4329 * A bug was fixed that causes [rustc not to apply default type
4330 parameters][1.6xc] when resolving certain method implementations of
4331 traits defined in other crates.
4333 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4334 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4335 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4336 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4337 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4338 [1.6co]: http://doc.rust-lang.org/core/index.html
4339 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4340 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4341 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4342 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4343 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4344 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4345 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4346 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4347 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4348 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4349 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4350 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4351 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4352 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4353 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4354 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4355 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4356 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4357 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4358 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4359 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4360 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4361 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4362 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4363 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4364 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4365 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4366 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4367 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4368 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4369 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4370 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4371 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4372 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4373 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4374 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4375 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4376 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4377 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4378 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4379 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4382 Version 1.5.0 (2015-12-10)
4383 ==========================
4385 * ~700 changes, numerous bugfixes
4391 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4392 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4393 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4394 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4395 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4396 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4397 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4398 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4399 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4400 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4401 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4402 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4403 [`Path::read_link`], [`Path::symlink_metadata`],
4404 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4405 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4406 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4407 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4408 [`slice::split_first_mut`], [`slice::split_first`],
4409 [`slice::split_last_mut`], [`slice::split_last`],
4410 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4411 [`str::MatchIndices`], [`str::RMatchIndices`],
4412 [`str::match_indices`], [`str::rmatch_indices`],
4413 [`str::slice_mut_unchecked`], [`string::ParseError`].
4414 * Rust applications hosted on crates.io can be installed locally to
4415 `~/.cargo/bin` with the [`cargo install`] command. Among other
4416 things this makes it easier to augment Cargo with new subcommands:
4417 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4418 invoked as `cargo foo`.
4419 * Crates with wildcard (`*`) dependencies will [emit warnings when
4420 published][1.5w]. In 1.6 it will no longer be possible to publish
4421 crates with wildcard dependencies.
4426 * The rules determining when a particular lifetime must outlive
4427 a particular value (known as '[dropck]') have been [modified
4428 to not rely on parametricity][1.5p].
4429 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4430 and `Arc`][1.5a]. Because these smart pointer types implement
4431 `Deref`, this causes breakage in cases where the interior type
4432 contains methods of the same name.
4433 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4434 that they could drop their content. Soundness fix.
4435 * All method invocations are [properly checked][1.5wf1] for
4436 [well-formedness][1.5wf2]. Soundness fix.
4437 * Traits whose supertraits contain `Self` are [not object
4438 safe][1.5o]. Soundness fix.
4439 * Target specifications support a [`no_default_libraries`][1.5nd]
4440 setting that controls whether `-nodefaultlibs` is passed to the
4441 linker, and in turn the `is_like_windows` setting no longer affects
4442 the `-nodefaultlibs` flag.
4443 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4444 * The `#[inline]` and `#[repr]` attributes [can only appear
4445 in valid locations][1.5at].
4446 * Native libraries linked from the local crate are [passed to
4447 the linker before native libraries from upstream crates][1.5nl].
4448 * Two rarely-used attributes, `#[no_debug]` and
4449 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4450 * Negation of unsigned integers, which has been a warning for
4451 several releases, [is now behind a feature gate and will
4452 generate errors][1.5nu].
4453 * The parser accidentally accepted visibility modifiers on
4454 enum variants, a bug [which has been fixed][1.5ev].
4455 * [A bug was fixed that allowed `use` statements to import unstable
4461 * When evaluating expressions at compile-time that are not
4462 compile-time constants (const-evaluating expressions in non-const
4463 contexts), incorrect code such as overlong bitshifts and arithmetic
4464 overflow will [generate a warning instead of an error][1.5ce],
4465 delaying the error until runtime. This will allow the
4466 const-evaluator to be expanded in the future backwards-compatibly.
4467 * The `improper_ctypes` lint [no longer warns about using `isize` and
4468 `usize` in FFI][1.5ict].
4473 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4475 * `Default` is [implemented for mutable slices][1.5d].
4476 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4477 * There are now `From` conversions [between floating point
4478 types][1.5f] where the conversions are lossless.
4479 * There are now `From` conversions [between integer types][1.5i] where
4480 the conversions are lossless.
4481 * [`fs::Metadata` implements `Clone`][1.5fs].
4482 * The `parse` method [accepts a leading "+" when parsing
4484 * [`AsMut` is implemented for `Vec`][1.5am].
4485 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4486 been optimized][1.5cf] and no longer rely on the default impl.
4487 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4488 `unsafe extern "C"` function types now [implement `Clone`,
4489 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4490 `fmt::Debug` for up to 12 arguments][1.5fp].
4491 * [Dropping `Vec`s is much faster in unoptimized builds when the
4492 element types don't implement `Drop`][1.5dv].
4493 * A bug that caused in incorrect behavior when [combining `VecDeque`
4494 with zero-sized types][1.5vdz] was resolved.
4495 * [`PartialOrd` for slices is faster][1.5po].
4500 * [Crate metadata size was reduced by 20%][1.5md].
4501 * [Improvements to code generation reduced the size of libcore by 3.3
4502 MB and rustc's memory usage by 18MB][1.5m].
4503 * [Improvements to deref translation increased performance in
4504 unoptimized builds][1.5dr].
4505 * Various errors in trait resolution [are deduplicated to only be
4506 reported once][1.5te].
4507 * Rust has preliminary [support for rumprun kernels][1.5rr].
4508 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4510 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4511 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4512 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4513 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4514 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4515 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4516 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4517 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4518 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4519 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4520 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4521 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4522 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4523 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4524 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4525 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4526 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4527 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4528 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4529 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4530 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4531 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4532 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4533 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4534 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4535 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4536 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4537 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4538 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4539 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4540 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4541 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4542 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4543 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4544 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4545 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4546 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4547 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4548 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4549 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4550 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4551 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4552 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4553 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4554 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4555 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4556 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4557 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4558 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4559 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4560 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4561 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4562 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4563 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4564 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4565 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4566 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4567 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4568 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4569 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4570 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4571 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4572 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4573 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4574 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4575 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4576 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4577 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4578 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4579 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4580 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4581 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4582 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4583 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4584 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4585 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4586 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4587 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4588 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4589 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4590 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4591 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4592 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4593 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4594 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4595 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4596 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4597 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4598 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4600 Version 1.4.0 (2015-10-29)
4601 ==========================
4603 * ~1200 changes, numerous bugfixes
4608 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4609 GNU) are now supported and recommended for use.
4614 * [Several changes have been made to fix type soundness and improve
4615 the behavior of associated types][sound]. See [RFC 1214]. Although
4616 we have mostly introduced these changes as warnings this release, to
4617 become errors next release, there are still some scenarios that will
4618 see immediate breakage.
4619 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4620 line breaks in addition to `\n`][crlf].
4621 * [Loans of `'static` lifetime extend to the end of a function][stat].
4622 * [`str::parse` no longer introduces avoidable rounding error when
4623 parsing floating point numbers. Together with earlier changes to
4624 float formatting/output, "round trips" like f.to_string().parse()
4625 now preserve the value of f exactly. Additionally, leading plus
4626 signs are now accepted][fp3].
4632 * `use` statements that import multiple items [can now rename
4633 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4634 * [Binops work correctly on fat pointers][binfat].
4635 * `pub extern crate`, which does not behave as expected, [issues a
4636 warning][pec] until a better solution is found.
4641 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4642 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4643 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4644 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4645 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4646 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4647 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4648 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4649 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4650 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4651 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4652 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4653 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4654 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4655 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4656 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4657 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4658 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4660 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4661 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4662 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4663 `f64::from_str_radix`.
4664 * [Reverse-searching strings is faster with the 'two-way'
4666 * [`std::io::copy` allows `?Sized` arguments][cc].
4667 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4668 [override `count`, `nth` and `last` with an O(1)
4669 implementation][it].
4670 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4671 * [`IntoRawFd` has been added to the Unix-specific prelude,
4672 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4674 * [`Extend<String>` and `FromIterator<String` are both implemented for
4676 * [`IntoIterator` is implemented for references to `Option` and
4678 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4679 Copy`][ext] as part of [RFC 839]. This will cause type inference
4680 breakage in rare situations.
4681 * [`BinaryHeap` implements `Debug`][bh2].
4682 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4684 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4685 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4686 * [String comparison is faster][faststr].
4687 * `&mut T` where `T: std::fmt::Write` [also implements
4688 `std::fmt::Write`][mutw].
4689 * [A stable regression in `VecDeque::push_back` and other
4690 capacity-altering methods that caused panics for zero-sized types
4692 * [Function pointers implement traits for up to 12 parameters][fp2].
4697 * The compiler [no longer uses the 'morestack' feature to prevent
4698 stack overflow][mm]. Instead it uses guard pages and stack
4699 probes (though stack probes are not yet implemented on any platform
4701 * [The compiler matches traits faster when projections are involved][p].
4702 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4704 * [Cargo now displays useful information about what its doing during
4705 `cargo update`][cu].
4707 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4708 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4709 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4710 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4711 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4712 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4713 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4714 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4715 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4716 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4717 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4718 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4719 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4720 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4721 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4722 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4723 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4724 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4725 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4726 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4727 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4728 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4729 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4730 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4731 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4732 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4733 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4734 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4735 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4736 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4737 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4738 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4739 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4740 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4741 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4742 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4743 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4744 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4745 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4746 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4747 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4748 [bh2]: https://github.com/rust-lang/rust/pull/28156
4749 [binfat]: https://github.com/rust-lang/rust/pull/28270
4750 [bm]: https://github.com/rust-lang/rust/pull/28197
4751 [cc]: https://github.com/rust-lang/rust/pull/27531
4752 [crlf]: https://github.com/rust-lang/rust/pull/28034
4753 [cu]: https://github.com/rust-lang/cargo/pull/1931
4754 [d]: https://github.com/rust-lang/rust/pull/27825
4755 [dep]: https://github.com/rust-lang/rust/pull/28339
4756 [es]: https://github.com/rust-lang/rust/pull/27956
4757 [ext]: https://github.com/rust-lang/rust/pull/28094
4758 [faststr]: https://github.com/rust-lang/rust/pull/28338
4759 [ffi]: https://github.com/rust-lang/rust/pull/28779
4760 [fp]: https://github.com/rust-lang/rust/pull/28268
4761 [fp2]: https://github.com/rust-lang/rust/pull/28560
4762 [fp3]: https://github.com/rust-lang/rust/pull/27307
4763 [i]: https://github.com/rust-lang/rust/pull/27451
4764 [into2]: https://github.com/rust-lang/rust/pull/28039
4765 [it]: https://github.com/rust-lang/rust/pull/27652
4766 [mm]: https://github.com/rust-lang/rust/pull/27338
4767 [mutw]: https://github.com/rust-lang/rust/pull/28368
4768 [sound]: https://github.com/rust-lang/rust/pull/27641
4769 [p]: https://github.com/rust-lang/rust/pull/27866
4770 [pec]: https://github.com/rust-lang/rust/pull/28486
4771 [pr]: https://github.com/rust-lang/rust/pull/27896
4772 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4773 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4774 [s]: https://github.com/rust-lang/rust/pull/27474
4775 [stab]: https://github.com/rust-lang/rust/pull/28339
4776 [stat]: https://github.com/rust-lang/rust/pull/28321
4777 [vd]: https://github.com/rust-lang/rust/pull/28494
4779 Version 1.3.0 (2015-09-17)
4780 ==============================
4782 * ~900 changes, numerous bugfixes
4787 * The [new object lifetime defaults][nold] have been [turned
4788 on][nold2] after a cycle of warnings about the change. Now types
4789 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4790 being interpreted as `&'a Box<Trait+'a>` to `&'a
4791 Box<Trait+'static>`.
4792 * [The Rustonomicon][nom] is a new book in the official documentation
4793 that dives into writing unsafe Rust.
4794 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4795 timekeeping is employed by other std APIs, as well as out-of-tree
4801 * The [new object lifetime defaults][nold] have been [turned
4802 on][nold2] after a cycle of warnings about the change.
4803 * There is a known [regression][lr] in how object lifetime elision is
4804 interpreted, the proper solution for which is undetermined.
4805 * The `#[prelude_import]` attribute, an internal implementation
4806 detail, was accidentally stabilized previously. [It has been put
4807 behind the `prelude_import` feature gate][pi]. This change is
4808 believed to break no existing code.
4809 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4810 [more sane for dynamically sized types][dst3]. Code that relied on
4811 the previous behavior is thought to be broken.
4812 * The `dropck` rules, which checks that destructors can't access
4813 destroyed values, [have been updated][dropck] to match the
4814 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4815 cause some previously-compiling code to no longer build.
4820 * The [new object lifetime defaults][nold] have been [turned
4821 on][nold2] after a cycle of warnings about the change.
4822 * Semicolons may [now follow types and paths in
4823 macros](https://github.com/rust-lang/rust/pull/27000).
4824 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4825 [more sane for dynamically sized types][dst3]. Code that relied on
4826 the previous behavior is not known to exist, and suspected to be
4828 * `'static` variables [may now be recursive][st].
4829 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4830 implementations correctly.
4831 * The `dropck` rules, which checks that destructors can't access
4832 destroyed values, [have been updated][dropck] to match the
4838 * The [`Duration`] API, [has been stabilized][ds], as well as the
4839 `std::time` module, which presently contains only `Duration`.
4840 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4841 * The owned C string, [`CString`], implements [`Borrow`] and the
4842 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4843 these allow C strings to be borrowed and cloned in generic code.
4844 * [`CStr`] implements [`Debug`].
4845 * [`AtomicPtr`] implements [`Debug`].
4846 * [`Error`] trait objects [can be downcast to their concrete types][e]
4847 in many common configurations, using the [`is`], [`downcast`],
4848 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4850 * Searching for substrings now [employs the two-way algorithm][search]
4851 instead of doing a naive search. This gives major speedups to a
4852 number of methods, including [`contains`][sc], [`find`][sf],
4853 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4854 [`ends_with`][sew] are also faster.
4855 * The performance of `PartialEq` for slices is [much faster][ps].
4856 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4857 is overridden and optimized by the implementations for scalars.
4858 * The [`Hasher`] trait now has a number of specialized `write_*`
4859 methods for primitive types, for efficiency.
4860 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4861 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4862 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4863 of [`std::error::Error::cause`][iec] also delegates to the inner
4865 * [`process::Child`][pc] gained the [`id`] method, which returns a
4866 `u32` representing the platform-specific process identifier.
4867 * The [`connect`] method on slices is deprecated, replaced by the new
4868 [`join`] method (note that both of these are on the *unstable*
4869 [`SliceConcatExt`] trait, but through the magic of the prelude are
4870 available to stable code anyway).
4871 * The [`Div`] operator is implemented for [`Wrapping`] types.
4872 * [`DerefMut` is implemented for `String`][dms].
4873 * Performance of SipHash (the default hasher for `HashMap`) is
4874 [better for long data][sh].
4875 * [`AtomicPtr`] implements [`Send`].
4876 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4877 are now [specialized to use uninitialized buffers for increased
4879 * Lifetime parameters of foreign functions [are now resolved
4885 * Rust can now, with some coercion, [produce programs that run on
4886 Windows XP][xp], though XP is not considered a supported platform.
4887 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4888 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4889 recommended for use in 1.3, though should be fully-functional
4890 in the [64-bit 1.4 beta][b14].
4891 * On Fedora-based systems installation will [properly configure the
4892 dynamic linker][fl].
4893 * The compiler gained many new extended error descriptions, which can
4894 be accessed with the `--explain` flag.
4895 * The `dropck` pass, which checks that destructors can't access
4896 destroyed values, [has been rewritten][dropck]. This fixes some
4897 soundness holes, and as such will cause some previously-compiling
4898 code to no longer build.
4899 * `rustc` now uses [LLVM to write archive files where possible][ar].
4900 Eventually this will eliminate the compiler's dependency on the ar
4902 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4903 supported FreeBSD on x86_64).
4904 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4905 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4907 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4908 will kill the process instead of leaking][nlp].
4910 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4911 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4912 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4913 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4914 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4915 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4916 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4917 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4918 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4919 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4920 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4921 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4922 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4923 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4924 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4925 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4926 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4927 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4928 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4929 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4930 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4931 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4932 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4933 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4934 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4935 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4936 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4937 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4938 [ar]: https://github.com/rust-lang/rust/pull/26926
4939 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4940 [dms]: https://github.com/rust-lang/rust/pull/26241
4941 [dropck]: https://github.com/rust-lang/rust/pull/27261
4942 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4943 [ds]: https://github.com/rust-lang/rust/pull/26818
4944 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4945 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4946 [dst3]: https://github.com/rust-lang/rust/pull/27351
4947 [e]: https://github.com/rust-lang/rust/pull/24793
4948 [f]: https://github.com/rust-lang/rust/pull/26588
4949 [fb]: https://github.com/rust-lang/rust/pull/26959
4950 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4951 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4952 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4953 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4954 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4955 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4956 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4957 [lic]: https://github.com/rust-lang/rust/pull/26583
4958 [lnu]: https://github.com/rust-lang/rust/pull/27026
4959 [lr]: https://github.com/rust-lang/rust/issues/27248
4960 [lum]: https://github.com/rust-lang/rust/pull/26378
4961 [lur]: https://github.com/rust-lang/rust/pull/26783
4962 [nlp]: https://github.com/rust-lang/rust/pull/27176
4963 [nold2]: https://github.com/rust-lang/rust/pull/27045
4964 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4965 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4966 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4967 [pi]: https://github.com/rust-lang/rust/pull/26699
4968 [ps]: https://github.com/rust-lang/rust/pull/26884
4969 [rte]: https://github.com/rust-lang/rust/pull/26950
4970 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4971 [search]: https://github.com/rust-lang/rust/pull/26327
4972 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4973 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4974 [sh]: https://github.com/rust-lang/rust/pull/27280
4975 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4976 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4977 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4978 [st]: https://github.com/rust-lang/rust/pull/26630
4979 [win1]: https://github.com/rust-lang/rust/pull/26569
4980 [win2]: https://github.com/rust-lang/rust/pull/26741
4981 [win3]: https://github.com/rust-lang/rust/pull/26741
4982 [win4]: https://github.com/rust-lang/rust/pull/27210
4983 [xp]: https://github.com/rust-lang/rust/pull/26569
4985 Version 1.2.0 (2015-08-07)
4986 ==========================
4988 * ~1200 changes, numerous bugfixes
4993 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4994 like `Rc` to contain types without a fixed size, arrays and trait
4995 objects, finally enabling use of `Rc<[T]>` and completing the
4996 implementation of DST.
4997 * [Parallel codegen][parcodegen] is now working again, which can
4998 substantially speed up large builds in debug mode; It also gets
4999 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5000 jobs). It's not enabled by default, but will be "in the near
5001 future". It can be activated with the `-C codegen-units=N` flag to
5003 * This is the first release with [experimental support for linking
5004 with the MSVC linker and lib C on Windows (instead of using the GNU
5005 variants via MinGW)][win]. It is yet recommended only for the most
5006 intrepid Rustaceans.
5007 * Benchmark compilations are showing a 30% improvement in
5008 bootstrapping over 1.1.
5013 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5014 unicode case mapping, which is a previously-planned change in
5015 behavior and considered a bugfix.
5016 * [`mem::align_of`] now specifies [the *minimum alignment* for
5017 T][align], which is usually the alignment programs are interested
5018 in, and the same value reported by clang's
5019 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5021 * [The `#[packed]` attribute is no longer silently accepted by the
5022 compiler][packed]. This attribute did nothing and code that
5023 mentioned it likely did not work as intended.
5024 * Associated type defaults are [now behind the
5025 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5026 defaults *did not work*, but could be mentioned syntactically. As
5027 such this breakage has minimal impact.
5032 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5033 matching against dereferenceable values.
5038 * The [`Extend`] trait, which grows a collection from an iterator, is
5039 implemented over iterators of references, for `String`, `Vec`,
5040 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5041 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5042 * The [`iter::once`] function returns an iterator that yields a single
5043 element, and [`iter::empty`] returns an iterator that yields no
5045 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5046 over substring matches.
5047 * [`Cell`] and [`RefCell`] both implement `Eq`.
5048 * A number of methods for wrapping arithmetic are added to the
5049 integral types, [`wrapping_div`], [`wrapping_rem`],
5050 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5051 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5052 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5053 type.. It is illegal for the default arithmetic operations in Rust
5054 to overflow; the desire to wrap must be explicit.
5055 * The `{:#?}` formatting specifier [displays the alternate,
5056 pretty-printed][debugfmt] form of the `Debug` formatter. This
5057 feature was actually introduced prior to 1.0 with little
5059 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5060 for writing data to formatted strings, similar to [`io::Write`].
5061 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5062 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5063 are used by code generators to emit implementations of [`Debug`].
5064 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5065 methods that convert case, following Unicode case mapping.
5066 * It is now easier to handle poisoned locks. The [`PoisonError`]
5067 type, returned by failing lock operations, exposes `into_inner`,
5068 `get_ref`, and `get_mut`, which all give access to the inner lock
5069 guard, and allow the poisoned lock to continue to operate. The
5070 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5071 poisoned lock without attempting to take the lock.
5072 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5073 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5074 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5075 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5077 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5083 * `rustc` employs smarter heuristics for guessing at [typos].
5084 * `rustc` emits more efficient code for [no-op conversions between
5085 unsafe pointers][nop].
5086 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5087 resulting in faster compile times and smaller code.
5089 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5090 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5091 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5092 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5093 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5094 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5095 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5096 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5097 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5098 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5099 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5100 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5101 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5102 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5103 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5104 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5105 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5106 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5107 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5108 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5109 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5110 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5111 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5112 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5113 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5114 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5115 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5116 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5117 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5118 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5119 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5120 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5121 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5122 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5123 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5124 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5125 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5126 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5127 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5128 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5129 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5130 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5131 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5132 [align]: https://github.com/rust-lang/rust/pull/25646
5133 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5134 [typos]: https://github.com/rust-lang/rust/pull/26087
5135 [nop]: https://github.com/rust-lang/rust/pull/26336
5136 [fat]: https://github.com/rust-lang/rust/pull/26411
5137 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5138 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5139 [packed]: https://github.com/rust-lang/rust/pull/25541
5140 [ad]: https://github.com/rust-lang/rust/pull/27382
5141 [win]: https://github.com/rust-lang/rust/pull/25350
5143 Version 1.1.0 (2015-06-25)
5144 =========================
5146 * ~850 changes, numerous bugfixes
5151 * The [`std::fs` module has been expanded][fs] to expand the set of
5152 functionality exposed:
5153 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5154 don't incur a syscall on some platforms.
5155 * A `symlink_metadata` function has been added.
5156 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5157 access to all underlying information.
5158 * The compiler now contains extended explanations of many errors. When an error
5159 with an explanation occurs the compiler suggests using the `--explain` flag
5160 to read the explanation. Error explanations are also [available online][err-index].
5161 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5162 well as other work, the time to bootstrap the compiler decreased by
5168 * The [`str::split_whitespace`] method splits a string on unicode
5169 whitespace boundaries.
5170 * On both Windows and Unix, new extension traits provide conversion of
5171 I/O types to and from the underlying system handles. On Unix, these
5172 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5173 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5174 `TcpListener`, and `UpdSocket`. Further implementations for
5175 `std::process` will be stabilized later.
5176 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5177 Windows, symlinks can be created with
5178 `std::os::windows::symlink_dir` and
5179 `std::os::windows::symlink_file`.
5180 * The `mpsc::Receiver` type can now be converted into an iterator with
5181 `into_iter` on the [`IntoIterator`] trait.
5182 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5183 implementation of the [`From`] trait.
5184 * The `Debug` implementation for `RangeFull` [creates output that is
5185 more consistent with other implementations][rf].
5186 * [`Debug` is implemented for `File`][file].
5187 * The `Default` implementation for `Arc` [no longer requires `Sync +
5189 * [The `Iterator` methods `count`, `nth`, and `last` have been
5190 overridden for slices to have O(1) performance instead of O(n)][si].
5191 * Incorrect handling of paths on Windows has been improved in both the
5192 compiler and the standard library.
5193 * [`AtomicPtr` gained a `Default` implementation][ap].
5194 * In accordance with Rust's policy on arithmetic overflow `abs` now
5195 [panics on overflow when debug assertions are enabled][abs].
5196 * The [`Cloned`] iterator, which was accidentally left unstable for
5197 1.0 [has been stabilized][c].
5198 * The [`Incoming`] iterator, which iterates over incoming TCP
5199 connections, and which was accidentally unnamable in 1.0, [is now
5200 properly exported][inc].
5201 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5202 `sift_up` or `sift_down` panic][bh].
5203 * The [`split_off`] method of `LinkedList` [no longer corrupts
5204 the list in certain scenarios][ll].
5209 * Type checking performance [has improved notably][sk] with
5210 [multiple improvements][pre].
5211 * The compiler [suggests code changes][ch] for more errors.
5212 * rustc and it's build system have experimental support for [building
5213 toolchains against MUSL][m] instead of glibc on Linux.
5214 * The compiler defines the `target_env` cfg value, which is used for
5215 distinguishing toolchains that are otherwise for the same
5216 platform. Presently this is set to `gnu` for common GNU Linux
5217 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5218 * The [`cargo rustc`][crc] command invokes a build with custom flags
5220 * [Android executables are always position independent][pie].
5221 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5224 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5225 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5226 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5227 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5228 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5229 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5230 [rf]: https://github.com/rust-lang/rust/pull/24491
5231 [err-index]: https://doc.rust-lang.org/error-index.html
5232 [sk]: https://github.com/rust-lang/rust/pull/24615
5233 [pre]: https://github.com/rust-lang/rust/pull/25323
5234 [file]: https://github.com/rust-lang/rust/pull/24598
5235 [ch]: https://github.com/rust-lang/rust/pull/24683
5236 [arc]: https://github.com/rust-lang/rust/pull/24695
5237 [si]: https://github.com/rust-lang/rust/pull/24701
5238 [ap]: https://github.com/rust-lang/rust/pull/24834
5239 [m]: https://github.com/rust-lang/rust/pull/24777
5240 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5241 [crc]: https://github.com/rust-lang/cargo/pull/1568
5242 [pie]: https://github.com/rust-lang/rust/pull/24953
5243 [abs]: https://github.com/rust-lang/rust/pull/25441
5244 [c]: https://github.com/rust-lang/rust/pull/25496
5245 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5246 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5247 [inc]: https://github.com/rust-lang/rust/pull/25522
5248 [bh]: https://github.com/rust-lang/rust/pull/25856
5249 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5250 [ll]: https://github.com/rust-lang/rust/pull/26022
5251 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5252 [drop]: https://github.com/rust-lang/rust/pull/24935
5254 Version 1.0.0 (2015-05-15)
5255 ========================
5257 * ~1500 changes, numerous bugfixes
5262 * The vast majority of the standard library is now `#[stable]`. It is
5263 no longer possible to use unstable features with a stable build of
5265 * Many popular crates on [crates.io] now work on the stable release
5267 * Arithmetic on basic integer types now [checks for overflow in debug
5273 * Several [restrictions have been added to trait coherence][coh] in
5274 order to make it easier for upstream authors to change traits
5275 without breaking downstream code.
5276 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5277 improve error messages and macro behavior. For example, `0b1234` is
5278 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5279 * Trait bounds [are always invariant][inv], eliminating the need for
5280 the `PhantomFn` and `MarkerTrait` lang items, which have been
5282 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5283 "foo" as bar` syntax has been replaced with `extern crate foo as
5284 bar`, and Cargo now automatically translates "-" in *package* names
5285 to underscore for the crate name.
5286 * [Lifetime shadowing is an error][lt].
5287 * [`Send` no longer implies `'static`][send-rfc].
5288 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5289 `MyType::default()`.
5290 * Primitive types [now have inherent methods][prim-inherent],
5291 obviating the need for extension traits like `SliceExt`.
5292 * Methods with `Self: Sized` in their `where` clause are [considered
5293 object-safe][self-sized], allowing many extension traits like
5294 `IteratorExt` to be merged into the traits they extended.
5295 * You can now [refer to associated types][assoc-where] whose
5296 corresponding trait bounds appear only in a `where` clause.
5297 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5298 like `Send` and `Sync` are now library-defined.
5299 * A [Reflect trait][reflect] was introduced, which means that
5300 downcasting via the `Any` trait is effectively limited to concrete
5301 types. This helps retain the potentially-important "parametricity"
5302 property: generic code cannot behave differently for different type
5303 arguments except in minor ways.
5304 * The `unsafe_destructor` feature is now deprecated in favor of the
5305 [new `dropck`][dropck]. This change is a major reduction in unsafe
5311 * The `thread_local` module [has been renamed to `std::thread`][th].
5312 * The methods of `IteratorExt` [have been moved to the `Iterator`
5314 * Several traits that implement Rust's conventions for type
5315 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5316 [centralized in the `std::convert` module][con].
5317 * The `FromError` trait [was removed in favor of `From`][fe].
5318 * The basic sleep function [has moved to
5319 `std::thread::sleep_ms`][slp].
5320 * The `splitn` function now takes an `n` parameter that represents the
5321 number of items yielded by the returned iterator [instead of the
5322 number of 'splits'][spl].
5323 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5324 * [Derived implementations of `PartialOrd` now order enums according
5325 to their explicitly-assigned discriminants][po].
5326 * [Methods for searching strings are generic over `Pattern`s][pat],
5327 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5329 * [In method resolution, object methods are resolved before inherent
5331 * [`String::from_str` has been deprecated in favor of the `From` impl,
5332 `String::from`][sf].
5333 * [`io::Error` implements `Sync`][ios].
5334 * [The `words` method on `&str` has been replaced with
5335 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5337 * The new path and IO modules are complete and `#[stable]`. This
5338 was the major library focus for this cycle.
5339 * The path API was [revised][path-normalize] to normalize `.`,
5340 adjusting the tradeoffs in favor of the most common usage.
5341 * A large number of remaining APIs in `std` were also stabilized
5342 during this cycle; about 75% of the non-deprecated API surface
5344 * The new [string pattern API][string-pattern] landed, which makes
5345 the string slice API much more internally consistent and flexible.
5346 * A new set of [generic conversion traits][conversion] replaced
5347 many existing ad hoc traits.
5348 * Generic numeric traits were [completely removed][num-traits]. This
5349 was made possible thanks to inherent methods for primitive types,
5350 and the removal gives maximal flexibility for designing a numeric
5351 hierarchy in the future.
5352 * The `Fn` traits are now related via [inheritance][fn-inherit]
5353 and provide ergonomic [blanket implementations][fn-blanket].
5354 * The `Index` and `IndexMut` traits were changed to
5355 [take the index by value][index-value], enabling code like
5356 `hash_map["string"]` to work.
5357 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5358 `Copy` data is known to be `Clone` as well.
5363 * Many errors now have extended explanations that can be accessed with
5364 the `--explain` flag to `rustc`.
5365 * Many new examples have been added to the standard library
5367 * rustdoc has received a number of improvements focused on completion
5369 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5370 * Much headway was made on ecosystem-wide CI, making it possible
5371 to [compare builds for breakage][ci-compare].
5374 [crates.io]: http://crates.io
5375 [clo]: https://github.com/rust-lang/rust/pull/24034
5376 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5377 [con]: https://github.com/rust-lang/rust/pull/23875
5378 [cr]: https://github.com/rust-lang/rust/pull/23419
5379 [fe]: https://github.com/rust-lang/rust/pull/23879
5380 [ie]: https://github.com/rust-lang/rust/pull/23300
5381 [inv]: https://github.com/rust-lang/rust/pull/23938
5382 [ios]: https://github.com/rust-lang/rust/pull/24133
5383 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5384 [lt]: https://github.com/rust-lang/rust/pull/24057
5385 [meth]: https://github.com/rust-lang/rust/pull/24056
5386 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5387 [po]: https://github.com/rust-lang/rust/pull/24270
5388 [sf]: https://github.com/rust-lang/rust/pull/24517
5389 [slp]: https://github.com/rust-lang/rust/pull/23949
5390 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5391 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5392 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5393 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5394 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5395 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5396 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5397 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5398 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5399 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5400 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5401 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5402 [reflect]: https://github.com/rust-lang/rust/pull/23712
5403 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5404 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5405 [index-value]: https://github.com/rust-lang/rust/pull/23601
5406 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5407 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5408 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5409 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5410 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5411 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5414 Version 1.0.0-alpha.2 (2015-02-20)
5415 =====================================
5417 * ~1300 changes, numerous bugfixes
5421 * The various I/O modules were [overhauled][io-rfc] to reduce
5422 unnecessary abstractions and provide better interoperation with
5423 the underlying platform. The old `io` module remains temporarily
5425 * The standard library now [participates in feature gating][feat],
5426 so use of unstable libraries now requires a `#![feature(...)]`
5427 attribute. The impact of this change is [described on the
5428 forum][feat-forum]. [RFC][feat-rfc].
5432 * `for` loops [now operate on the `IntoIterator` trait][into],
5433 which eliminates the need to call `.iter()`, etc. to iterate
5434 over collections. There are some new subtleties to remember
5435 though regarding what sort of iterators various types yield, in
5436 particular that `for foo in bar { }` yields values from a move
5437 iterator, destroying the original collection. [RFC][into-rfc].
5438 * Objects now have [default lifetime bounds][obj], so you don't
5439 have to write `Box<Trait+'static>` when you don't care about
5440 storing references. [RFC][obj-rfc].
5441 * In types that implement `Drop`, [lifetimes must outlive the
5442 value][drop]. This will soon make it possible to safely
5443 implement `Drop` for types where `#[unsafe_destructor]` is now
5444 required. Read the [gorgeous RFC][drop-rfc] for details.
5445 * The fully qualified <T as Trait>::X syntax lets you set the Self
5446 type for a trait method or associated type. [RFC][ufcs-rfc].
5447 * References to types that implement `Deref<U>` now [automatically
5448 coerce to references][deref] to the dereferenced type `U`,
5449 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5450 should eliminate many unsightly uses of `&*`, as when converting
5451 from references to vectors into references to
5452 slices. [RFC][deref-rfc].
5453 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5454 `|:|`) is obsolete and closure kind is inferred from context.
5455 * [`Self` is a keyword][Self].
5459 * The `Show` and `String` formatting traits [have been
5460 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5461 their related purposes. Automatically getting a string
5462 conversion to use with `format!("{:?}", something_to_debug)` is
5463 now written `#[derive(Debug)]`.
5464 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5465 OsStr}`, provide strings in platform-specific encodings for easier
5466 interop with system APIs. [RFC][osstr-rfc].
5467 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5468 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5469 creating raw pointers.
5473 * Certain long error messages of the form 'expected foo found bar'
5474 are now [split neatly across multiple
5475 lines][multiline]. Examples in the PR.
5476 * On Unix Rust can be [uninstalled][un] by running
5477 `/usr/local/lib/rustlib/uninstall.sh`.
5478 * The `#[rustc_on_unimplemented]` attribute, requiring the
5479 'on_unimplemented' feature, lets rustc [display custom error
5480 messages when a trait is expected to be implemented for a type
5485 * Rust is tested against a [LALR grammar][lalr], which parses
5486 almost all the Rust files that rustc does.
5488 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5489 [close]: https://github.com/rust-lang/rust/pull/21843
5490 [deref]: https://github.com/rust-lang/rust/pull/21351
5491 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5492 [drop]: https://github.com/rust-lang/rust/pull/21972
5493 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5494 [feat]: https://github.com/rust-lang/rust/pull/21248
5495 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5496 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5497 [fmt]: https://github.com/rust-lang/rust/pull/21457
5498 [into]: https://github.com/rust-lang/rust/pull/20790
5499 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5500 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5501 [lalr]: https://github.com/rust-lang/rust/pull/21452
5502 [multiline]: https://github.com/rust-lang/rust/pull/19870
5503 [obj]: https://github.com/rust-lang/rust/pull/22230
5504 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5505 [onun]: https://github.com/rust-lang/rust/pull/20889
5506 [osstr]: https://github.com/rust-lang/rust/pull/21488
5507 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5508 [Self]: https://github.com/rust-lang/rust/pull/22158
5509 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5510 [un]: https://github.com/rust-lang/rust/pull/22256
5513 Version 1.0.0-alpha (2015-01-09)
5514 ==================================
5516 * ~2400 changes, numerous bugfixes
5520 * The language itself is considered feature complete for 1.0,
5521 though there will be many usability improvements and bugfixes
5522 before the final release.
5523 * Nearly 50% of the public API surface of the standard library has
5524 been declared 'stable'. Those interfaces are unlikely to change
5526 * The long-running debate over integer types has been
5527 [settled][ints]: Rust will ship with types named `isize` and
5528 `usize`, rather than `int` and `uint`, for pointer-sized
5529 integers. Guidelines will be rolled out during the alpha cycle.
5530 * Most crates that are not `std` have been moved out of the Rust
5531 distribution into the Cargo ecosystem so they can evolve
5532 separately and don't need to be stabilized as quickly, including
5533 'time', 'getopts', 'num', 'regex', and 'term'.
5534 * Documentation continues to be expanded with more API coverage, more
5535 examples, and more in-depth explanations. The guides have been
5536 consolidated into [The Rust Programming Language][trpl].
5537 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5538 * All official Rust binary installers now come with [Cargo], the
5539 Rust package manager.
5543 * Closures have been [completely redesigned][unboxed] to be
5544 implemented in terms of traits, can now be used as generic type
5545 bounds and thus monomorphized and inlined, or via an opaque
5546 pointer (boxed) as in the old system. The new system is often
5547 referred to as 'unboxed' closures.
5548 * Traits now support [associated types][assoc], allowing families
5549 of related types to be defined together and used generically in
5551 * Enum variants are [namespaced by their type names][enum].
5552 * [`where` clauses][where] provide a more versatile and attractive
5553 syntax for specifying generic bounds, though the previous syntax
5555 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5557 * Rust [no longer has a runtime][rt] of any description, and only
5558 supports OS threads, not green threads.
5559 * At long last, Rust has been overhauled for 'dynamically-sized
5560 types' ([DST]), which integrates 'fat pointers' (object types,
5561 arrays, and `str`) more deeply into the type system, making it
5563 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5564 `..j` that produce range types and which, when combined with the
5565 `Index` operator and multidispatch, leads to a convenient slice
5567 * The new range syntax revealed an ambiguity in the fixed-length
5568 array syntax, so now fixed length arrays [are written `[T;
5570 * The `Copy` trait is no longer implemented automatically. Unsafe
5571 pointers no longer implement `Sync` and `Send` so types
5572 containing them don't automatically either. `Sync` and `Send`
5573 are now 'unsafe traits' so one can "forcibly" implement them via
5574 `unsafe impl` if a type confirms to the requirements for them
5575 even though the internals do not (e.g. structs containing unsafe
5576 pointers like `Arc`). These changes are intended to prevent some
5577 footguns and are collectively known as [opt-in built-in
5578 traits][oibit] (though `Sync` and `Send` will soon become pure
5579 library types unknown to the compiler).
5580 * Operator traits now take their operands [by value][ops], and
5581 comparison traits can use multidispatch to compare one type
5582 against multiple other types, allowing e.g. `String` to be
5583 compared with `&str`.
5584 * `if let` and `while let` are no longer feature-gated.
5585 * Rust has adopted a more [uniform syntax for escaping unicode
5586 characters][unicode].
5587 * `macro_rules!` [has been declared stable][mac]. Though it is a
5588 flawed system it is sufficiently popular that it must be usable
5589 for 1.0. Effort has gone into [future-proofing][mac-future] it
5590 in ways that will allow other macro systems to be developed in
5591 parallel, and won't otherwise impact the evolution of the
5593 * The prelude has been [pared back significantly][prelude] such
5594 that it is the minimum necessary to support the most pervasive
5595 code patterns, and through [generalized where clauses][where]
5596 many of the prelude extension traits have been consolidated.
5597 * Rust's rudimentary reflection [has been removed][refl], as it
5598 incurred too much code generation for little benefit.
5599 * [Struct variants][structvars] are no longer feature-gated.
5600 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5601 known as 'higher-ranked trait bounds', this crucially allows
5602 unboxed closures to work.
5603 * Macros invocations surrounded by parens or square brackets and
5604 not terminated by a semicolon are [parsed as
5605 expressions][macros], which makes expressions like `vec![1i32,
5606 2, 3].len()` work as expected.
5607 * Trait objects now implement their traits automatically, and
5608 traits that can be coerced to objects now must be [object
5610 * Automatically deriving traits is now done with `#[derive(...)]`
5611 not `#[deriving(...)]` for [consistency with other naming
5612 conventions][derive].
5613 * Importing the containing module or enum at the same time as
5614 items or variants they contain is [now done with `self` instead
5615 of `mod`][self], as in use `foo::{self, bar}`
5616 * Glob imports are no longer feature-gated.
5617 * The `box` operator and `box` patterns have been feature-gated
5618 pending a redesign. For now unique boxes should be allocated
5619 like other containers, with `Box::new`.
5623 * A [series][coll1] of [efforts][coll2] to establish
5624 [conventions][coll3] for collections types has resulted in API
5625 improvements throughout the standard library.
5626 * New [APIs for error handling][err] provide ergonomic interop
5627 between error types, and [new conventions][err-conv] describe
5628 more clearly the recommended error handling strategies in Rust.
5629 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5630 it is easier to discuss failure in the context of error handling
5631 without making clarifications as to whether you are referring to
5632 the 'fail' macro or failure more generally.
5633 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5634 syscall when available.
5635 * The 'serialize' crate has been renamed 'rustc-serialize' and
5636 moved out of the distribution to Cargo. Although it is widely
5637 used now, it is expected to be superseded in the near future.
5638 * The `Show` formatter, typically implemented with
5639 `#[derive(Show)]` is [now requested with the `{:?}`
5640 specifier][show] and is intended for use by all types, for uses
5641 such as `println!` debugging. The new `String` formatter must be
5642 implemented by hand, uses the `{}` specifier, and is intended
5643 for full-fidelity conversions of things that can logically be
5644 represented as strings.
5648 * [Flexible target specification][flex] allows rustc's code
5649 generation to be configured to support otherwise-unsupported
5651 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5652 respective debuggers with Rust-appropriate pretty-printing.
5653 * The Windows installation of Rust is distributed with the
5654 MinGW components currently required to link binaries on that
5659 * Nullable enum optimizations have been extended to more types so
5660 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5661 space than the inner types themselves.
5662 * Work has begun on supporting AArch64.
5664 [Cargo]: https://crates.io
5665 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5666 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5667 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5668 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5669 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5670 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5671 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5672 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5673 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5674 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5675 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5676 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5677 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5678 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5679 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5680 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5681 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5682 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5683 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5684 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5685 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5686 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5687 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5688 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5689 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5690 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5691 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5692 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5693 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5694 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5695 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5696 [trpl]: https://doc.rust-lang.org/book/index.html
5697 [rbe]: http://rustbyexample.com/
5700 Version 0.12.0 (2014-10-09)
5701 =============================
5703 * ~1900 changes, numerous bugfixes
5707 * The introductory documentation (now called The Rust Guide) has
5708 been completely rewritten, as have a number of supplementary
5710 * Rust's package manager, Cargo, continues to improve and is
5711 sometimes considered to be quite awesome.
5712 * Many API's in `std` have been reviewed and updated for
5713 consistency with the in-development Rust coding
5714 guidelines. The standard library documentation tracks
5715 stabilization progress.
5716 * Minor libraries have been moved out-of-tree to the rust-lang org
5717 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5718 be installed with Cargo.
5719 * Lifetime elision allows lifetime annotations to be left off of
5720 function declarations in many common scenarios.
5721 * Rust now works on 64-bit Windows.
5724 * Indexing can be overloaded with the `Index` and `IndexMut`
5726 * The `if let` construct takes a branch only if the `let` pattern
5727 matches, currently behind the 'if_let' feature gate.
5728 * 'where clauses', a more flexible syntax for specifying trait
5729 bounds that is more aesthetic, have been added for traits and
5730 free functions. Where clauses will in the future make it
5731 possible to constrain associated types, which would be
5732 impossible with the existing syntax.
5733 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5734 the 'slicing_syntax' feature gate, and can be overloaded with
5735 the `Slice` or `SliceMut` traits.
5736 * The syntax for matching of sub-slices has been changed to use a
5737 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5738 consistency with other uses of `..` and to future-proof
5739 potential additional uses of the syntax.
5740 * The syntax for matching inclusive ranges in patterns has changed
5741 from `0..3` to `0...4` to be consistent with the exclusive range
5743 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5744 c]`) has been put behind the 'advanced_slice_patterns' feature
5745 gate and may be removed in the future.
5746 * Components of tuples and tuple structs can be extracted using
5747 the `value.0` syntax, currently behind the `tuple_indexing`
5749 * The `#[crate_id]` attribute is no longer supported; versioning
5750 is handled by the package manager.
5751 * Renaming crate imports are now written `extern crate foo as bar`
5752 instead of `extern crate bar = foo`.
5753 * Renaming use statements are now written `use foo as bar` instead
5755 * `let` and `match` bindings and argument names in macros are now
5757 * The new, more efficient, closure types ('unboxed closures') have
5758 been added under a feature gate, 'unboxed_closures'. These will
5759 soon replace the existing closure types, once higher-ranked
5760 trait lifetimes are added to the language.
5761 * `move` has been added as a keyword, for indicating closures
5762 that capture by value.
5763 * Mutation and assignment is no longer allowed in pattern guards.
5764 * Generic structs and enums can now have trait bounds.
5765 * The `Share` trait is now called `Sync` to free up the term
5766 'shared' to refer to 'shared reference' (the default reference
5768 * Dynamically-sized types have been mostly implemented,
5769 unifying the behavior of fat-pointer types with the rest of the
5771 * As part of dynamically-sized types, the `Sized` trait has been
5772 introduced, which qualifying types implement by default, and
5773 which type parameters expect by default. To specify that a type
5774 parameter does not need to be sized, write `<Sized? T>`. Most
5775 types are `Sized`, notable exceptions being unsized arrays
5776 (`[T]`) and trait types.
5777 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5778 * Lifetime bounds can now be applied to type parameters and object
5780 * The old, reference counted GC type, `Gc<T>` which was once
5781 denoted by the `@` sigil, has finally been removed. GC will be
5782 revisited in the future.
5785 * Library documentation has been improved for a number of modules.
5786 * Bit-vectors, collections::bitv has been modernized.
5787 * The url crate is deprecated in favor of
5788 http://github.com/servo/rust-url, which can be installed with
5790 * Most I/O stream types can be cloned and subsequently closed from
5792 * A `std::time::Duration` type has been added for use in I/O
5793 methods that rely on timers, as well as in the 'time' crate's
5794 `Timespec` arithmetic.
5795 * The runtime I/O abstraction layer that enabled the green thread
5796 scheduler to do non-thread-blocking I/O has been removed, along
5797 with the libuv-based implementation employed by the green thread
5798 scheduler. This will greatly simplify the future I/O work.
5799 * `collections::btree` has been rewritten to have a more
5800 idiomatic and efficient design.
5803 * rustdoc output now indicates the stability levels of API's.
5804 * The `--crate-name` flag can specify the name of the crate
5805 being compiled, like `#[crate_name]`.
5806 * The `-C metadata` specifies additional metadata to hash into
5807 symbol names, and `-C extra-filename` specifies additional
5808 information to put into the output filename, for use by the
5809 package manager for versioning.
5810 * debug info generation has continued to improve and should be
5811 more reliable under both gdb and lldb.
5812 * rustc has experimental support for compiling in parallel
5813 using the `-C codegen-units` flag.
5814 * rustc no longer encodes rpath information into binaries by
5818 * Stack usage has been optimized with LLVM lifetime annotations.
5819 * Official Rust binaries on Linux are more compatible with older
5820 kernels and distributions, built on CentOS 5.10.
5823 Version 0.11.0 (2014-07-02)
5824 ==========================
5826 * ~1700 changes, numerous bugfixes
5829 * ~[T] has been removed from the language. This type is superseded by
5831 * ~str has been removed from the language. This type is superseded by
5833 * ~T has been removed from the language. This type is superseded by the
5835 * @T has been removed from the language. This type is superseded by the
5836 standard library's std::gc::Gc<T> type.
5837 * Struct fields are now all private by default.
5838 * Vector indices and shift amounts are both required to be a `uint`
5839 instead of any integral type.
5840 * Byte character, byte string, and raw byte string literals are now all
5841 supported by prefixing the normal literal with a `b`.
5842 * Multiple ABIs are no longer allowed in an ABI string
5843 * The syntax for lifetimes on closures/procedures has been tweaked
5844 slightly: `<'a>|A, B|: 'b + K -> T`
5845 * Floating point modulus has been removed from the language; however it
5846 is still provided by a library implementation.
5847 * Private enum variants are now disallowed.
5848 * The `priv` keyword has been removed from the language.
5849 * A closure can no longer be invoked through a &-pointer.
5850 * The `use foo, bar, baz;` syntax has been removed from the language.
5851 * The transmute intrinsic no longer works on type parameters.
5852 * Statics now allow blocks/items in their definition.
5853 * Trait bounds are separated from objects with + instead of : now.
5854 * Objects can no longer be read while they are mutably borrowed.
5855 * The address of a static is now marked as insignificant unless the
5856 #[inline(never)] attribute is placed it.
5857 * The #[unsafe_destructor] attribute is now behind a feature gate.
5858 * Struct literals are no longer allowed in ambiguous positions such as
5859 if, while, match, and for..in.
5860 * Declaration of lang items and intrinsics are now feature-gated by
5862 * Integral literals no longer default to `int`, and floating point
5863 literals no longer default to `f64`. Literals must be suffixed with an
5864 appropriate type if inference cannot determine the type of the
5866 * The Box<T> type is no longer implicitly borrowed to &mut T.
5867 * Procedures are now required to not capture borrowed references.
5870 * The standard library is now a "facade" over a number of underlying
5871 libraries. This means that development on the standard library should
5872 be speedier due to smaller crates, as well as a clearer line between
5874 * A new library, libcore, lives under the standard library's facade
5875 which is Rust's "0-assumption" library, suitable for embedded and
5876 kernel development for example.
5877 * A regex crate has been added to the standard distribution. This crate
5878 includes statically compiled regular expressions.
5879 * The unwrap/unwrap_err methods on Result require a Show bound for
5880 better error messages.
5881 * The return types of the std::comm primitives have been centralized
5882 around the Result type.
5883 * A number of I/O primitives have gained the ability to time out their
5885 * A number of I/O primitives have gained the ability to close their
5886 reading/writing halves to cancel pending operations.
5887 * Reverse iterator methods have been removed in favor of `rev()` on
5888 their forward-iteration counterparts.
5889 * A bitflags! macro has been added to enable easy interop with C and
5890 management of bit flags.
5891 * A debug_assert! macro is now provided which is disabled when
5892 `--cfg ndebug` is passed to the compiler.
5893 * A graphviz crate has been added for creating .dot files.
5894 * The std::cast module has been migrated into std::mem.
5895 * The std::local_data api has been migrated from freestanding functions
5896 to being based on methods.
5897 * The Pod trait has been renamed to Copy.
5898 * jemalloc has been added as the default allocator for types.
5899 * The API for allocating memory has been changed to use proper alignment
5900 and sized deallocation
5901 * Connecting a TcpStream or binding a TcpListener is now based on a
5902 string address and a u16 port. This allows connecting to a hostname as
5904 * The Reader trait now contains a core method, read_at_least(), which
5905 correctly handles many repeated 0-length reads.
5906 * The process-spawning API is now centered around a builder-style
5908 * The :? printing qualifier has been moved from the standard library to
5909 an external libdebug crate.
5910 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5911 have been renamed to Eq/Ord.
5912 * The select/plural methods have been removed from format!. The escapes
5913 for { and } have also changed from \{ and \} to {{ and }},
5915 * The TaskBuilder API has been re-worked to be a true builder, and
5916 extension traits for spawning native/green tasks have been added.
5919 * All breaking changes to the language or libraries now have their
5920 commit message annotated with `[breaking-change]` to allow for easy
5921 discovery of breaking changes.
5922 * The compiler will now try to suggest how to annotate lifetimes if a
5923 lifetime-related error occurs.
5924 * Debug info continues to be improved greatly with general bug fixes and
5925 better support for situations like link time optimization (LTO).
5926 * Usage of syntax extensions when cross-compiling has been fixed.
5927 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5928 -fdata-sections and --gc-sections has been enabled by default
5929 * The compiler is now stricter about where it will load module files
5930 from when a module is declared via `mod foo;`.
5931 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5932 Syntax extensions are now discovered via a "plugin registrar" type
5933 which will be extended in the future to other various plugins.
5934 * Lints have been restructured to allow for dynamically loadable lints.
5935 * A number of rustdoc improvements:
5936 * The HTML output has been visually redesigned.
5937 * Markdown is now powered by hoedown instead of sundown.
5938 * Searching heuristics have been greatly improved.
5939 * The search index has been reduced in size by a great amount.
5940 * Cross-crate documentation via `pub use` has been greatly improved.
5941 * Primitive types are now hyperlinked and documented.
5942 * Documentation has been moved from static.rust-lang.org/doc to
5944 * A new sandbox, play.rust-lang.org, is available for running and
5945 sharing rust code examples on-line.
5946 * Unused attributes are now more robustly warned about.
5947 * The dead_code lint now warns about unused struct fields.
5948 * Cross-compiling to iOS is now supported.
5949 * Cross-compiling to mipsel is now supported.
5950 * Stability attributes are now inherited by default and no longer apply
5951 to intra-crate usage, only inter-crate usage.
5952 * Error message related to non-exhaustive match expressions have been
5956 Version 0.10 (2014-04-03)
5957 =========================
5959 * ~1500 changes, numerous bugfixes
5962 * A new RFC process is now in place for modifying the language.
5963 * Patterns with `@`-pointers have been removed from the language.
5964 * Patterns with unique vectors (`~[T]`) have been removed from the
5966 * Patterns with unique strings (`~str`) have been removed from the
5968 * `@str` has been removed from the language.
5969 * `@[T]` has been removed from the language.
5970 * `@self` has been removed from the language.
5971 * `@Trait` has been removed from the language.
5972 * Headers on `~` allocations which contain `@` boxes inside the type for
5973 reference counting have been removed.
5974 * The semantics around the lifetimes of temporary expressions have changed,
5975 see #3511 and #11585 for more information.
5976 * Cross-crate syntax extensions are now possible, but feature gated. See
5977 #11151 for more information. This includes both `macro_rules!` macros as
5978 well as syntax extensions such as `format!`.
5979 * New lint modes have been added, and older ones have been turned on to be
5981 * Unnecessary parentheses
5984 * Uppercase variables
5985 * Publicly visible private types
5986 * `#[deriving]` with raw pointers
5987 * Unsafe functions can no longer be coerced to closures.
5988 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5989 * The `#[simd]` attribute is now behind a feature gate.
5990 * Visibility is no longer allowed on `extern crate` statements, and
5991 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5992 * Trailing commas are now allowed in argument lists and tuple patterns.
5993 * The `do` keyword has been removed, it is now a reserved keyword.
5994 * Default type parameters have been implemented, but are feature gated.
5995 * Borrowed variables through captures in closures are now considered soundly.
5996 * `extern mod` is now `extern crate`
5997 * The `Freeze` trait has been removed.
5998 * The `Share` trait has been added for types that can be shared among
6000 * Labels in macros are now hygienic.
6001 * Expression/statement macro invocations can be delimited with `{}` now.
6002 * Treatment of types allowed in `static mut` locations has been tweaked.
6003 * The `*` and `.` operators are now overloadable through the `Deref` and
6005 * `~Trait` and `proc` no longer have `Send` bounds by default.
6006 * Partial type hints are now supported with the `_` type marker.
6007 * An `Unsafe` type was introduced for interior mutability. It is now
6008 considered undefined to transmute from `&T` to `&mut T` without using the
6010 * The #[linkage] attribute was implemented for extern statics/functions.
6011 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6012 * `Pod` was renamed to `Copy`.
6015 * The `libextra` library has been removed. It has now been decomposed into
6016 component libraries with smaller and more focused nuggets of
6017 functionality. The full list of libraries can be found on the
6018 documentation index page.
6019 * std: `std::condition` has been removed. All I/O errors are now propagated
6020 through the `Result` type. In order to assist with error handling, a
6021 `try!` macro for unwrapping errors with an early return and a lint for
6022 unused results has been added. See #12039 for more information.
6023 * std: The `vec` module has been renamed to `slice`.
6024 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6025 This will become the only growable vector in the future.
6026 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6027 are now found at `std::io::BufferedReader` instead of
6028 `std::io::buffered::BufferedReader`.
6029 * std: `print` and `println` are no longer in the prelude, the `print!` and
6030 `println!` macros are intended to be used instead.
6031 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6032 attempts to statically prevent cycles.
6033 * std: The standard distribution is adopting the policy of pushing failure
6034 to the user rather than failing in libraries. Many functions (such as
6035 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6036 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6037 deriving mode: `#[deriving(Show)]`.
6038 * std: `ToStr` is now implemented for all types implementing `Show`.
6039 * std: The formatting trait methods now take `&self` instead of `&T`
6040 * std: The `invert()` method on iterators has been renamed to `rev()`
6041 * std: `std::num` has seen a reduction in the genericity of its traits,
6042 consolidating functionality into a few core traits.
6043 * std: Backtraces are now printed on task failure if the environment
6044 variable `RUST_BACKTRACE` is present.
6045 * std: Naming conventions for iterators have been standardized. More details
6046 can be found on the wiki's style guide.
6047 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6048 still implement the function.
6049 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6050 * std: `assert_approx_eq!` has been removed
6051 * std: The `e` and `E` formatting specifiers for floats have been added to
6052 print them in exponential notation.
6053 * std: The `Times` trait has been removed
6054 * std: Indications of variance and opting out of builtin bounds is done
6055 through marker types in `std::kinds::marker` now
6056 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6057 `#[deriving(Hash)]` is now possible.
6058 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6059 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6060 * std: `Chan::new` is now `channel()`.
6061 * std: A new synchronous channel type has been implemented.
6062 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6063 * std: `hashmap` and `trie` have been moved to `libcollections`
6064 * std: `run` has been rolled into `io::process`
6065 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6066 * std: The equality and comparison traits have seen some reorganization.
6067 * std: `rand` has moved to `librand`.
6068 * std: `to_{lower,upper}case` has been implemented for `char`.
6069 * std: Logging has been moved to `liblog`.
6070 * collections: `HashMap` has been rewritten for higher performance and less
6072 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6073 it can be booted manually. The runtime guide has more information and
6075 * native: All I/O functionality except signals has been implemented.
6076 * green: Task spawning with `libgreen` has been optimized with stack caching
6077 and various trimming of code.
6078 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6079 * sync: The `extra::sync` module has been updated to modern rust (and moved
6080 to the `sync` library), tweaking and improving various interfaces while
6081 dropping redundant functionality.
6082 * sync: A new `Barrier` type has been added to the `sync` library.
6083 * sync: An efficient mutex for native and green tasks has been implemented.
6084 * serialize: The `base64` module has seen some improvement. It treats
6085 newlines better, has non-string error values, and has seen general
6087 * fourcc: A `fourcc!` macro was introduced
6088 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6089 hexadecimal literal.
6092 * `rustpkg` has been deprecated and removed from the main repository. Its
6093 replacement, `cargo`, is under development.
6094 * Nightly builds of rust are now available
6095 * The memory usage of rustc has been improved many times throughout this
6097 * The build process supports disabling rpath support for the rustc binary
6099 * Code generation has improved in some cases, giving more information to the
6100 LLVM optimization passes to enable more extensive optimizations.
6101 * Debuginfo compatibility with lldb on OSX has been restored.
6102 * The master branch is now gated on an android bot, making building for
6103 android much more reliable.
6104 * Output flags have been centralized into one `--emit` flag.
6105 * Crate type flags have been centralized into one `--crate-type` flag.
6106 * Codegen flags have been consolidated behind a `-C` flag.
6107 * Linking against outdated crates now has improved error messages.
6108 * Error messages with lifetimes will often suggest how to annotate the
6109 function to fix the error.
6110 * Many more types are documented in the standard library, and new guides
6112 * Many `rustdoc` improvements:
6113 * code blocks are syntax highlighted.
6114 * render standalone markdown files.
6115 * the --test flag tests all code blocks by default.
6116 * exported macros are displayed.
6117 * re-exported types have their documentation inlined at the location of the
6119 * search works across crates that have been rendered to the same output
6123 Version 0.9 (2014-01-09)
6124 ==========================
6126 * ~1800 changes, numerous bugfixes
6129 * The `float` type has been removed. Use `f32` or `f64` instead.
6130 * A new facility for enabling experimental features (feature gating) has
6131 been added, using the crate-level `#[feature(foo)]` attribute.
6132 * Managed boxes (@) are now behind a feature gate
6133 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6134 standard library's `Gc` or `Rc` types instead.
6135 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6136 * Jumping back to the top of a loop is now done with `continue` instead of
6138 * Strings can no longer be mutated through index assignment.
6139 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6140 hash delimiters, as in `r###"foo"###`.
6141 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6143 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6144 * `@fn`s have been removed.
6145 * `do` only works with procs in order to make it obvious what the cost
6147 * Single-element tuple-like structs can no longer be dereferenced to
6148 obtain the inner value. A more comprehensive solution for overloading
6149 the dereference operator will be provided in the future.
6150 * The `#[link(...)]` attribute has been replaced with
6151 `#[crate_id = "name#vers"]`.
6152 * Empty `impl`s must be terminated with empty braces and may not be
6153 terminated with a semicolon.
6154 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6155 no longer has any special meaning.
6156 * The old `fmt!` string formatting macro has been removed.
6157 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6158 `print!` and `println!`.
6159 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6160 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6161 `extern mod foo = "bar"` instead.
6162 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6163 * Macros can have attributes.
6164 * Macros can expand to items with attributes.
6165 * Macros can expand to multiple items.
6166 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6167 * Comments may be nested.
6168 * Values automatically coerce to trait objects they implement, without
6170 * Enum discriminants are no longer an entire word but as small as needed to
6171 contain all the variants. The `repr` attribute can be used to override
6172 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6173 `#[repr(C)]` to match C enums.
6174 * Non-string literals are not allowed in attributes (they never worked).
6175 * The FFI now supports variadic functions.
6176 * Octal numeric literals, as in `0o7777`.
6177 * The `concat!` syntax extension performs compile-time string concatenation.
6178 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6179 removed as Rust no longer uses segmented stacks.
6180 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6181 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6182 not `*`; ignoring remaining fields of a struct is also done with `..`,
6183 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6184 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6185 * `rustc` supports the "system" calling convention, which defaults to the
6186 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6188 * The `type_overflow` lint (default: warn) checks literals for overflow.
6189 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6190 * The `attribute_usage` lint (default: warn) warns about unknown
6192 * The `unknown_features` lint (default: warn) warns about unknown
6194 * The `dead_code` lint (default: warn) checks for dead code.
6195 * Rust libraries can be linked statically to one another
6196 * `#[link_args]` is behind the `link_args` feature gate.
6197 * Native libraries are now linked with `#[link(name = "foo")]`
6198 * Native libraries can be statically linked to a rust crate
6199 (`#[link(name = "foo", kind = "static")]`).
6200 * Native OS X frameworks are now officially supported
6201 (`#[link(name = "foo", kind = "framework")]`).
6202 * The `#[thread_local]` attribute creates thread-local (not task-local)
6203 variables. Currently behind the `thread_local` feature gate.
6204 * The `return` keyword may be used in closures.
6205 * Types that can be copied via a memcpy implement the `Pod` kind.
6206 * The `cfg` attribute can now be used on struct fields and enum variants.
6209 * std: The `option` and `result` API's have been overhauled to make them
6210 simpler, more consistent, and more composable.
6211 * std: The entire `std::io` module has been replaced with one that is
6212 more comprehensive and that properly interfaces with the underlying
6213 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6215 * std: `io::util` contains a number of useful implementations of
6216 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6217 `ZeroReader`, `TeeReader`.
6218 * std: The reference counted pointer type `extra::rc` moved into std.
6219 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6220 just a wrapper around it).
6221 * std: The `Either` type has been removed.
6222 * std: `fmt::Default` can be implemented for any type to provide default
6223 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6224 * std: The `rand` API continues to be tweaked.
6225 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6226 on failure in gdb, is now named `rust_fail`.
6227 * std: The `each_key` and `each_value` methods on `HashMap` have been
6228 replaced by the `keys` and `values` iterators.
6229 * std: Functions dealing with type size and alignment have moved from the
6230 `sys` module to the `mem` module.
6231 * std: The `path` module was written and API changed.
6232 * std: `str::from_utf8` has been changed to cast instead of allocate.
6233 * std: `starts_with` and `ends_with` methods added to vectors via the
6234 `ImmutableEqVector` trait, which is in the prelude.
6235 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6236 if the index is out of bounds.
6237 * std: Task failure no longer propagates between tasks, as the model was
6238 complex, expensive, and incompatible with thread-based tasks.
6239 * std: The `Any` type can be used for dynamic typing.
6240 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6242 * std: Methods that produce iterators generally do not have an `_iter`
6244 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6245 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6246 * std: `util::ignore` renamed to `prelude::drop`.
6247 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6249 * std: `vec::raw` has seen a lot of cleanup and API changes.
6250 * std: The standard library no longer includes any C++ code, and very
6251 minimal C, eliminating the dependency on libstdc++.
6252 * std: Runtime scheduling and I/O functionality has been factored out into
6253 extensible interfaces and is now implemented by two different crates:
6254 libnative, for native threading and I/O; and libgreen, for green threading
6255 and I/O. This paves the way for using the standard library in more limited
6256 embedded environments.
6257 * std: The `comm` module has been rewritten to be much faster, have a
6258 simpler, more consistent API, and to work for both native and green
6260 * std: All libuv dependencies have been moved into the rustuv crate.
6261 * native: New implementations of runtime scheduling on top of OS threads.
6262 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6264 * green: The green thread scheduler and message passing types are almost
6266 * extra: The `flatpipes` module had bitrotted and was removed.
6267 * extra: All crypto functions have been removed and Rust now has a policy of
6268 not reimplementing crypto in the standard library. In the future crypto
6269 will be provided by external crates with bindings to established libraries.
6270 * extra: `c_vec` has been modernized.
6271 * extra: The `sort` module has been removed. Use the `sort` method on
6275 * The `rust` and `rusti` commands have been removed, due to lack of
6277 * `rustdoc` was completely rewritten.
6278 * `rustdoc` can test code examples in documentation.
6279 * `rustpkg` can test packages with the argument, 'test'.
6280 * `rustpkg` supports arbitrary dependencies, including C libraries.
6281 * `rustc`'s support for generating debug info is improved again.
6282 * `rustc` has better error reporting for unbalanced delimiters.
6283 * `rustc`'s JIT support was removed due to bitrot.
6284 * Executables and static libraries can be built with LTO (-Z lto)
6285 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6289 Version 0.8 (2013-09-26)
6290 ============================
6292 * ~2200 changes, numerous bugfixes
6295 * The `for` loop syntax has changed to work with the `Iterator` trait.
6296 * At long last, unwinding works on Windows.
6297 * Default methods are ready for use.
6298 * Many trait inheritance bugs fixed.
6299 * Owned and borrowed trait objects work more reliably.
6300 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6301 * rustc can omit emission of code for the `debug!` macro if it is passed
6303 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6304 for foo.rs, then foo/mod.rs, and will generate an error when both are
6306 * Strings no longer contain trailing nulls. The new `std::c_str` module
6307 provides new mechanisms for converting to C strings.
6308 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6309 * The FFI has been overhauled such that foreign functions are called directly,
6310 instead of through a stack-switching wrapper.
6311 * Calling a foreign function must be done through a Rust function with the
6312 `#[fixed_stack_segment]` attribute.
6313 * The `externfn!` macro can be used to declare both a foreign function and
6314 a `#[fixed_stack_segment]` wrapper at once.
6315 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6316 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6317 * `priv` is disallowed everywhere except for struct fields and enum variants.
6318 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6319 * `ref` bindings in irrefutable patterns work correctly now.
6320 * `char` is now prevented from containing invalid code points.
6321 * Casting to `bool` is no longer allowed.
6322 * `\0` is now accepted as an escape in chars and strings.
6323 * `yield` is a reserved keyword.
6324 * `typeof` is a reserved keyword.
6325 * Crates may be imported by URL with `extern mod foo = "url";`.
6326 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6327 * Static vectors can be initialized with repeating elements,
6328 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6329 * Static structs can be initialized with functional record update,
6330 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6331 * `cfg!` can be used to conditionally execute code based on the crate
6332 configuration, similarly to `#[cfg(...)]`.
6333 * The `unnecessary_qualification` lint detects unneeded module
6334 prefixes (default: allow).
6335 * Arithmetic operations have been implemented on the SIMD types in
6336 `std::unstable::simd`.
6337 * Exchange allocation headers were removed, reducing memory usage.
6338 * `format!` implements a completely new, extensible, and higher-performance
6339 string formatting system. It will replace `fmt!`.
6340 * `print!` and `println!` write formatted strings (using the `format!`
6341 extension) to stdout.
6342 * `write!` and `writeln!` write formatted strings (using the `format!`
6343 extension) to the new Writers in `std::rt::io`.
6344 * The library section in which a function or static is placed may
6345 be specified with `#[link_section = "..."]`.
6346 * The `proto!` syntax extension for defining bounded message protocols
6348 * `macro_rules!` is hygienic for `let` declarations.
6349 * The `#[export_name]` attribute specifies the name of a symbol.
6350 * `unreachable!` can be used to indicate unreachable code, and fails
6354 * std: Transitioned to the new runtime, written in Rust.
6355 * std: Added an experimental I/O library, `rt::io`, based on the new
6357 * std: A new generic `range` function was added to the prelude, replacing
6358 `uint::range` and friends.
6359 * std: `range_rev` no longer exists. Since range is an iterator it can be
6360 reversed with `range(lo, hi).invert()`.
6361 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6362 renamed to `unwrap_or`.
6363 * std: The `iterator` module was renamed to `iter`.
6364 * std: Integral types now support the `checked_add`, `checked_sub`, and
6365 `checked_mul` operations for detecting overflow.
6366 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6368 * std: Methods are standardizing on conventions for casting methods:
6369 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6371 * std: The `CString` type in `c_str` provides new ways to convert to and
6373 * std: `DoubleEndedIterator` can yield elements in two directions.
6374 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6376 * std: `str::from_bytes` renamed to `str::from_utf8`.
6377 * std: `pop_opt` and `shift_opt` methods added to vectors.
6378 * std: The task-local data interface no longer uses @, and keys are
6379 no longer function pointers.
6380 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6381 * std: Added `SharedPort` to `comm`.
6382 * std: `Eq` has a default method for `ne`; only `eq` is required
6384 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6385 is required in implementations.
6386 * std: `is_utf8` performance is improved, impacting many string functions.
6387 * std: `os::MemoryMap` provides cross-platform mmap.
6388 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6389 are not 'in-bounds' are considered undefined.
6390 * std: Many freestanding functions in `vec` removed in favor of methods.
6391 * std: Many freestanding functions on scalar types removed in favor of
6393 * std: Many options to task builders were removed since they don't make
6394 sense in the new scheduler design.
6395 * std: More containers implement `FromIterator` so can be created by the
6397 * std: More complete atomic types in `unstable::atomics`.
6398 * std: `comm::PortSet` removed.
6399 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6400 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6401 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6402 default implementations.
6403 * std: Various `from_str` functions were removed in favor of a generic
6404 `from_str` which is available in the prelude.
6405 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6406 * extra: `dlist`, the doubly-linked list was modernized.
6407 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6408 * extra: Added `glob` module, replacing `std::os::glob`.
6409 * extra: `rope` was removed.
6410 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6411 * extra: `net`, and `timer` were removed. The experimental replacements
6412 are `std::rt::io::net` and `std::rt::io::timer`.
6413 * extra: Iterators implemented for `SmallIntMap`.
6414 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6415 * extra: `SmallIntSet` removed. Use `BitvSet`.
6416 * extra: Performance of JSON parsing greatly improved.
6417 * extra: `semver` updated to SemVer 2.0.0.
6418 * extra: `term` handles more terminals correctly.
6419 * extra: `dbg` module removed.
6420 * extra: `par` module removed.
6421 * extra: `future` was cleaned up, with some method renames.
6422 * extra: Most free functions in `getopts` were converted to methods.
6425 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6426 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6427 similarly to gcc's `--march` flag.
6428 * rustc's performance compiling small crates is much better.
6429 * rustpkg has received many improvements.
6430 * rustpkg supports git tags as package IDs.
6431 * rustpkg builds into target-specific directories so it can be used for
6433 * The number of concurrent test tasks is controlled by the environment
6434 variable RUST_TEST_TASKS.
6435 * The test harness can now report metrics for benchmarks.
6436 * All tools have man pages.
6437 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6438 * The runtime uses jemalloc for allocations.
6439 * Segmented stacks are temporarily disabled as part of the transition to
6440 the new runtime. Stack overflows are possible!
6441 * A new documentation backend, rustdoc_ng, is available for use. It is
6442 still invoked through the normal `rustdoc` command.
6445 Version 0.7 (2013-07-03)
6446 =======================
6448 * ~2000 changes, numerous bugfixes
6451 * `impl`s no longer accept a visibility qualifier. Put them on methods
6453 * The borrow checker has been rewritten with flow-sensitivity, fixing
6454 many bugs and inconveniences.
6455 * The `self` parameter no longer implicitly means `&'self self`,
6456 and can be explicitly marked with a lifetime.
6457 * Overloadable compound operators (`+=`, etc.) have been temporarily
6458 removed due to bugs.
6459 * The `for` loop protocol now requires `for`-iterators to return `bool`
6460 so they compose better.
6461 * The `Durable` trait is replaced with the `'static` bounds.
6462 * Trait default methods work more often.
6463 * Structs with the `#[packed]` attribute have byte alignment and
6464 no padding between fields.
6465 * Type parameters bound by `Copy` must now be copied explicitly with
6467 * It is now illegal to move out of a dereferenced unsafe pointer.
6468 * `Option<~T>` is now represented as a nullable pointer.
6469 * `@mut` does dynamic borrow checks correctly.
6470 * The `main` function is only detected at the topmost level of the crate.
6471 The `#[main]` attribute is still valid anywhere.
6472 * Struct fields may no longer be mutable. Use inherited mutability.
6473 * The `#[no_send]` attribute makes a type that would otherwise be
6475 * The `#[no_freeze]` attribute makes a type that would otherwise be
6477 * Unbounded recursion will abort the process after reaching the limit
6478 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6479 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6480 are never implicitly copyable.
6481 * `#[static_assert]` makes compile-time assertions about static bools.
6482 * At long last, 'argument modes' no longer exist.
6483 * The rarely used `use mod` statement no longer exists.
6486 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6488 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6489 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6491 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6492 and unsuffixed integer literals.
6495 * The `core` crate was renamed to `std`.
6496 * The `std` crate was renamed to `extra`.
6497 * More and improved documentation.
6498 * std: `iterator` module for external iterator objects.
6499 * Many old-style (internal, higher-order function) iterators replaced by
6500 implementations of `Iterator`.
6501 * std: Many old internal vector and string iterators,
6502 incl. `any`, `all`. removed.
6503 * std: The `finalize` method of `Drop` renamed to `drop`.
6504 * std: The `drop` method now takes `&mut self` instead of `&self`.
6505 * std: The prelude no longer re-exports any modules, only types and traits.
6506 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6507 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6508 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6509 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6510 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6511 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6512 * std: Many types implement `Clone`.
6513 * std: `path` type renamed to `Path`.
6514 * std: `mut` module and `Mut` type removed.
6515 * std: Many standalone functions removed in favor of methods and iterators
6516 in `vec`, `str`. In the future methods will also work as functions.
6517 * std: `reinterpret_cast` removed. Use `transmute`.
6518 * std: ascii string handling in `std::ascii`.
6519 * std: `Rand` is implemented for ~/@.
6520 * std: `run` module for spawning processes overhauled.
6521 * std: Various atomic types added to `unstable::atomic`.
6522 * std: Various types implement `Zero`.
6523 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6524 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6525 * std: Added `os::mkdir_recursive`.
6526 * std: Added `os::glob` function performs filesystems globs.
6527 * std: `FuzzyEq` renamed to `ApproxEq`.
6528 * std: `Map` now defines `pop` and `swap` methods.
6529 * std: `Cell` constructors converted to static methods.
6530 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6531 * extra: `flate` module moved from `std` to `extra`.
6532 * extra: `fileinput` module for iterating over a series of files.
6533 * extra: `Complex` number type and `complex` module.
6534 * extra: `Rational` number type and `rational` module.
6535 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6536 * extra: `term` uses terminfo now, is more correct.
6537 * extra: `arc` functions converted to methods.
6538 * extra: Implementation of fixed output size variations of SHA-2.
6541 * `unused_variable` lint mode for unused variables (default: warn).
6542 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6544 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6546 * `dead_assignment` lint mode for unread variables (default: warn).
6547 * `unnecessary_allocation` lint mode detects some heap allocations that are
6548 immediately borrowed so could be written without allocating (default: warn).
6549 * `missing_doc` lint mode (default: allow).
6550 * `unreachable_code` lint mode (default: warn).
6551 * The `rusti` command has been rewritten and a number of bugs addressed.
6552 * rustc outputs in color on more terminals.
6553 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6554 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6555 * Compiling with `-g` will make the binary record information about
6556 dynamic borrowcheck failures for debugging.
6557 * rustdoc has a nicer stylesheet.
6558 * Various improvements to rustdoc.
6559 * Improvements to rustpkg (see the detailed release notes).
6562 Version 0.6 (2013-04-03)
6563 ========================
6565 * ~2100 changes, numerous bugfixes
6568 * The self type parameter in traits is now spelled `Self`
6569 * The `self` parameter in trait and impl methods must now be explicitly
6570 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6571 * Static methods no longer require the `static` keyword and instead
6572 are distinguished by the lack of a `self` parameter
6573 * Replaced the `Durable` trait with the `'static` lifetime
6574 * The old closure type syntax with the trailing sigil has been
6575 removed in favor of the more consistent leading sigil
6576 * `super` is a keyword, and may be prefixed to paths
6577 * Trait bounds are separated with `+` instead of whitespace
6578 * Traits are implemented with `impl Trait for Type`
6579 instead of `impl Type: Trait`
6580 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6581 * The `export` keyword has finally been removed
6582 * The `move` keyword has been removed (see "Semantic changes")
6583 * The interior mutability qualifier on vectors, `[mut T]`, has been
6584 removed. Use `&mut [T]`, etc.
6585 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6586 * `fail` is no longer a keyword. Use `fail!()`
6587 * `assert` is no longer a keyword. Use `assert!()`
6588 * `log` is no longer a keyword. use `debug!`, etc.
6589 * 1-tuples may be represented as `(T,)`
6590 * Struct fields may no longer be `mut`. Use inherited mutability,
6591 `@mut T`, `core::mut` or `core::cell`
6592 * `extern mod { ... }` is no longer valid syntax for foreign
6593 function modules. Use extern blocks: `extern { ... }`
6594 * Newtype enums removed. Use tuple-structs.
6595 * Trait implementations no longer support visibility modifiers
6596 * Pattern matching over vectors improved and expanded
6597 * `const` renamed to `static` to correspond to lifetime name,
6598 and make room for future `static mut` unsafe mutable globals.
6599 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6600 * `Clone` implementations can be automatically generated with
6601 `#[deriving(Clone)]`
6602 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6603 instead of `foo as Bar`.
6604 * Fixed length vector types are now written as `[int, .. 3]`
6605 instead of `[int * 3]`.
6606 * Fixed length vector types can express the length as a constant
6607 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6610 * Types with owned pointers or custom destructors move by default,
6611 eliminating the `move` keyword
6612 * All foreign functions are considered unsafe
6613 * &mut is now unaliasable
6614 * Writes to borrowed @mut pointers are prevented dynamically
6616 * The name of the main function can be customized using #[main]
6617 * The default type of an inferred closure is &fn instead of @fn
6618 * `use` statements may no longer be "chained" - they cannot import
6619 identifiers imported by previous `use` statements
6620 * `use` statements are crate relative, importing from the "top"
6621 of the crate by default. Paths may be prefixed with `super::`
6622 or `self::` to change the search behavior.
6623 * Method visibility is inherited from the implementation declaration
6624 * Structural records have been removed
6625 * Many more types can be used in static items, including enums
6626 'static-lifetime pointers and vectors
6627 * Pattern matching over vectors improved and expanded
6628 * Typechecking of closure types has been overhauled to
6629 improve inference and eliminate unsoundness
6630 * Macros leave scope at the end of modules, unless that module is
6631 tagged with #[macro_escape]
6634 * Added big integers to `std::bigint`
6635 * Removed `core::oldcomm` module
6636 * Added pipe-based `core::comm` module
6637 * Numeric traits have been reorganized under `core::num`
6638 * `vec::slice` finally returns a slice
6639 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6640 * Containers reorganized around traits in `core::container`
6641 * `core::dvec` removed, `~[T]` is a drop-in replacement
6642 * `core::send_map` renamed to `core::hashmap`
6643 * `std::map` removed; replaced with `core::hashmap`
6644 * `std::treemap` reimplemented as an owned balanced tree
6645 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6646 * `core::trie` added as a fast ordered map for integer keys
6647 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6648 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6649 overload the comparison operators, whereas `TotalOrd` is used
6650 by certain container types
6653 * Replaced the 'cargo' package manager with 'rustpkg'
6654 * Added all-purpose 'rust' tool
6655 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6656 * rustc now *attempts* to offer spelling suggestions
6657 * Improved support for ARM and Android
6658 * Preliminary MIPS backend
6659 * Improved foreign function ABI implementation for x86, x86_64
6660 * Various memory usage improvements
6661 * Rust code may be embedded in foreign code under limited circumstances
6662 * Inline assembler supported by new asm!() syntax extension.
6665 Version 0.5 (2012-12-21)
6666 ===========================
6668 * ~900 changes, numerous bugfixes
6671 * Removed `<-` move operator
6672 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6673 * Removed old fixed length vector syntax - `[T]/N`
6674 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6675 * Macros may now expand to items and statements
6676 * `a.b()` is always parsed as a method call, never as a field projection
6677 * `Eq` and `IterBytes` implementations can be automatically generated
6678 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6679 * Removed the special crate language for `.rc` files
6680 * Function arguments may consist of any irrefutable pattern
6683 * `&` and `~` pointers may point to objects
6684 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6685 * Enum variants may be structs
6686 * Destructors can be added to all nominal types with the Drop trait
6687 * Structs and nullary enum variants may be constants
6688 * Values that cannot be implicitly copied are now automatically moved
6689 without writing `move` explicitly
6690 * `&T` may now be coerced to `*T`
6691 * Coercions happen in `let` statements as well as function calls
6692 * `use` statements now take crate-relative paths
6693 * The module and type namespaces have been merged so that static
6694 method names can be resolved under the trait in which they are
6697 * Improved support for language features
6698 * Trait inheritance works in many scenarios
6699 * More support for explicit self arguments in methods - `self`, `&self`
6700 `@self`, and `~self` all generally work as expected
6701 * Static methods work in more situations
6702 * Experimental: Traits may declare default methods for the implementations
6706 * New condition handling system in `core::condition`
6707 * Timsort added to `std::sort`
6708 * New priority queue, `std::priority_queue`
6709 * Pipes for serializable types, `std::flatpipes'
6710 * Serialization overhauled to be trait-based
6711 * Expanded `getopts` definitions
6712 * Moved futures to `std`
6713 * More functions are pure now
6714 * `core::comm` renamed to `oldcomm`. Still deprecated
6715 * `rustdoc` and `cargo` are libraries now
6718 * Added a preliminary REPL, `rusti`
6719 * License changed from MIT to dual MIT/APL2
6722 Version 0.4 (2012-10-15)
6723 ==========================
6725 * ~2000 changes, numerous bugfixes
6728 * All keywords are now strict and may not be used as identifiers anywhere
6729 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6730 'of', 'with', 'to', 'class'.
6731 * Classes are replaced with simpler structs
6732 * Explicit method self types
6733 * `ret` became `return` and `alt` became `match`
6734 * `import` is now `use`; `use is now `extern mod`
6735 * `extern mod { ... }` is now `extern { ... }`
6736 * `use mod` is the recommended way to import modules
6737 * `pub` and `priv` replace deprecated export lists
6738 * The syntax of `match` pattern arms now uses fat arrow (=>)
6739 * `main` no longer accepts an args vector; use `os::args` instead
6742 * Trait implementations are now coherent, ala Haskell typeclasses
6743 * Trait methods may be static
6744 * Argument modes are deprecated
6745 * Borrowed pointers are much more mature and recommended for use
6746 * Strings and vectors in the static region are stored in constant memory
6747 * Typestate was removed
6748 * Resolution rewritten to be more reliable
6749 * Support for 'dual-mode' data structures (freezing and thawing)
6752 * Most binary operators can now be overloaded via the traits in
6754 * `std::net::url` for representing URLs
6755 * Sendable hash maps in `core::send_map`
6756 * `core::task' gained a (currently unsafe) task-local storage API
6759 * An efficient new intertask communication primitive called the pipe,
6760 along with a number of higher-level channel types, in `core::pipes`
6761 * `std::arc`, an atomically reference counted, immutable, shared memory
6763 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6764 * Futures are now based on pipes and sendable
6765 * More robust linked task failure
6766 * Improved task builder API
6769 * Improved error reporting
6770 * Preliminary JIT support
6771 * Preliminary work on precise GC
6772 * Extensive architectural improvements to rustc
6773 * Begun a transition away from buggy C++-based reflection (shape) code to
6774 Rust-based (visitor) code
6775 * All hash functions and tables converted to secure, randomized SipHash
6778 Version 0.3 (2012-07-12)
6779 ========================
6781 * ~1900 changes, numerous bugfixes
6783 * New coding conveniences
6784 * Integer-literal suffix inference
6785 * Per-item control over warnings, errors
6786 * #[cfg(windows)] and #[cfg(unix)] attributes
6787 * Documentation comments
6788 * More compact closure syntax
6789 * 'do' expressions for treating higher-order functions as
6791 * *-patterns (wildcard extended to all constructor fields)
6794 * Name resolution pass and exhaustiveness checker rewritten
6795 * Region pointers and borrow checking supersede alias
6797 * Init-ness checking is now provided by a region-based liveness
6798 pass instead of the typestate pass; same for last-use analysis
6799 * Extensive work on region pointers
6801 * Experimental new language features
6802 * Slices and fixed-size, interior-allocated vectors
6803 * #!-comments for lang versioning, shell execution
6804 * Destructors and iface implementation for classes;
6805 type-parameterized classes and class methods
6806 * 'const' type kind for types that can be used to implement
6807 shared-memory concurrency patterns
6811 * Removal of various obsolete features
6812 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6813 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6815 * Constructs: do-while loops ('do' repurposed), fn binding,
6816 resources (replaced by destructors)
6818 * Compiler reorganization
6819 * Syntax-layer of compiler split into separate crate
6820 * Clang (from LLVM project) integrated into build
6821 * Typechecker split into sub-modules
6824 * New time functions
6825 * Extension methods for many built-in types
6826 * Arc: atomic-refcount read-only / exclusive-use shared cells
6827 * Par: parallel map and search routines
6828 * Extensive work on libuv interface
6829 * Much vector code moved to libraries
6830 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6831 #include, #include_str, #include_bin
6834 * Cargo automatically resolves dependencies
6837 Version 0.2 (2012-03-29)
6838 =========================
6840 * >1500 changes, numerous bugfixes
6842 * New docs and doc tooling
6844 * New port: FreeBSD x86_64
6846 * Compilation model enhancements
6847 * Generics now specialized, multiply instantiated
6848 * Functions now inlined across separate crates
6850 * Scheduling, stack and threading fixes
6851 * Noticeably improved message-passing performance
6852 * Explicit schedulers
6856 * Experimental new language features
6857 * Operator overloading
6861 * Various language extensions
6862 * C-callback function types: 'crust fn ...'
6863 * Infinite-loop construct: 'loop { ... }'
6864 * Shorten 'mutable' to 'mut'
6865 * Required mutable-local qualifier: 'let mut ...'
6866 * Basic glob-exporting: 'export foo::*;'
6867 * Alt now exhaustive, 'alt check' for runtime-checked
6868 * Block-function form of 'for' loop, with 'break' and 'ret'.
6871 * AST quasi-quote syntax extension
6872 * Revived libuv interface
6873 * New modules: core::{future, iter}, std::arena
6874 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6875 * Extensive cleanup, regularization in libstd, libcore
6878 Version 0.1 (2012-01-20)
6879 ===============================
6881 * Most language features work, including:
6882 * Unique pointers, unique closures, move semantics
6883 * Interface-constrained generics
6884 * Static interface dispatch
6886 * Multithread task scheduling
6887 * Typestate predicates
6888 * Failure unwinding, destructors
6889 * Pattern matching and destructuring assignment
6890 * Lightweight block-lambda syntax
6891 * Preliminary macro-by-example
6893 * Compiler works with the following configurations:
6894 * Linux: x86 and x86_64 hosts and targets
6895 * macOS: x86 and x86_64 hosts and targets
6896 * Windows: x86 hosts and targets
6898 * Cross compilation / multi-target configuration supported.
6900 * Preliminary API-documentation and package-management tools included.
6904 * Documentation is incomplete.
6906 * Performance is below intended target.
6908 * Standard library APIs are subject to extensive change, reorganization.
6910 * Language-level versioning is not yet operational - future code will