1 Version 1.28.0 (2018-08-02)
2 ===========================
6 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
7 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
8 the inner type across Foreign Function Interface (FFI) boundaries.
9 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
10 and can now be used as identifiers.][51196]
11 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
12 stable.][51241] This will allow users to specify a global allocator for
14 - [Unit test functions marked with the `#[test]` attribute can now return
15 `Result<(), E: Debug>` in addition to `()`.][51298]
16 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
17 allows macros to easily target lifetimes.
21 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
22 prioritise making smaller binary sizes. `z` is the same as `s` with the
23 exception that it does not vectorise loops, which typically results in an even
25 - [The short error format is now stable.][49546] Specified with
26 `--error-format=short` this option will provide a more compressed output of
28 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
29 - [Reduced the number of allocations in the macro parser.][50855] This can
30 improve compile times of macro heavy crates on average by 5%.
34 - [Implemented `Default` for `&mut str`.][51306]
35 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
36 - [Implemented `Extend` for `()`.][50234]
37 - [The `Debug` implementation of `time::Duration` should now be more easily
38 human readable.][50364] Previously a `Duration` of one second would printed as
39 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
40 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
41 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
42 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
43 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
44 for `PathBuf`.][50170]
45 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
46 and `Wrapping<i128>`.][50465]
47 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
48 possible.][51050] This can provide up to a 40% speed increase.
49 - [Improved error messages when using `format!`.][50610]
53 - [`Iterator::step_by`]
55 - [`btree_map::Entry::or_default`]
57 - [`hash_map::Entry::or_default`]
58 - [`iter::repeat_with`]
59 - [`num::NonZeroUsize`]
60 - [`num::NonZeroU128`]
65 - [`ops::RangeBounds`]
66 - [`slice::SliceIndex`]
69 - [`{Any + Send + Sync}::downcast_mut`]
70 - [`{Any + Send + Sync}::downcast_ref`]
71 - [`{Any + Send + Sync}::is`]
75 - [Cargo will now no longer allow you to publish crates with build scripts that
76 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
77 considered to be immutable.
81 - [The `suggestion_applicability` field in `rustc`'s json output is now
82 stable.][50486] This will allow dev tools to check whether a code suggestion
87 - [Rust will no longer consider trait objects with duplicated constraints to
88 have implementations.][51276] For example the below code will now fail
94 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
97 impl Trait + Send + Send {
98 fn test(&self) { println!("two"); }
102 [49546]: https://github.com/rust-lang/rust/pull/49546/
103 [50143]: https://github.com/rust-lang/rust/pull/50143/
104 [50170]: https://github.com/rust-lang/rust/pull/50170/
105 [50234]: https://github.com/rust-lang/rust/pull/50234/
106 [50265]: https://github.com/rust-lang/rust/pull/50265/
107 [50364]: https://github.com/rust-lang/rust/pull/50364/
108 [50385]: https://github.com/rust-lang/rust/pull/50385/
109 [50465]: https://github.com/rust-lang/rust/pull/50465/
110 [50486]: https://github.com/rust-lang/rust/pull/50486/
111 [50554]: https://github.com/rust-lang/rust/pull/50554/
112 [50610]: https://github.com/rust-lang/rust/pull/50610/
113 [50855]: https://github.com/rust-lang/rust/pull/50855/
114 [51050]: https://github.com/rust-lang/rust/pull/51050/
115 [51196]: https://github.com/rust-lang/rust/pull/51196/
116 [51200]: https://github.com/rust-lang/rust/pull/51200/
117 [51241]: https://github.com/rust-lang/rust/pull/51241/
118 [51276]: https://github.com/rust-lang/rust/pull/51276/
119 [51298]: https://github.com/rust-lang/rust/pull/51298/
120 [51306]: https://github.com/rust-lang/rust/pull/51306/
121 [51562]: https://github.com/rust-lang/rust/pull/51562/
122 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
123 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
124 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
125 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
126 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
127 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
128 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
129 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
130 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
131 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
132 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
133 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
134 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
135 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
136 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
137 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
138 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
139 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
140 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
141 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
143 Version 1.27.1 (2018-07-10)
144 ===========================
149 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
150 when running, which enabled executing code as some other user on a
151 given machine. This release fixes that vulnerability; you can read
152 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
154 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
159 - The borrow checker was fixed to avoid an additional potential unsoundness when using
160 match ergonomics: [#51415][51415], [#49534][49534].
162 [51415]: https://github.com/rust-lang/rust/issues/51415
163 [49534]: https://github.com/rust-lang/rust/issues/49534
164 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
165 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
167 Version 1.27.0 (2018-06-21)
168 ==========================
172 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
173 be used as an identifer.
174 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
175 bare `Trait` syntax, and should make it clearer when being used in tandem with
176 `impl Trait`. Since it is equivalent to the following syntax:
177 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
178 `Box<Trait> == Box<dyn Trait>`.
179 - [Attributes on generic parameters such as types and lifetimes are
180 now stable.][48851] e.g.
181 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
182 - [The `#[must_use]` attribute can now also be used on functions as well as
183 types.][48925] It provides a lint that by default warns users when the
184 value returned by a function has not been used.
188 - [Added the `armv5te-unknown-linux-musl` target.][50423]
192 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
193 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
194 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
195 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
197 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
198 std are now available in core.][49896]
199 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
201 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
202 that the operation isn't done in place.
203 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
204 the `#[must_use]` attribute][49533] to warn about unused potentially
205 expensive allocations.
209 - [`DoubleEndedIterator::rfind`]
210 - [`DoubleEndedIterator::rfold`]
211 - [`DoubleEndedIterator::try_rfold`]
212 - [`Duration::from_micros`]
213 - [`Duration::from_nanos`]
214 - [`Duration::subsec_micros`]
215 - [`Duration::subsec_millis`]
216 - [`HashMap::remove_entry`]
217 - [`Iterator::try_fold`]
218 - [`Iterator::try_for_each`]
221 - [`String::replace_range`]
222 - [`Take::set_limit`]
223 - [`hint::unreachable_unchecked`]
224 - [`os::unix::process::parent_id`]
225 - [`ptr::swap_nonoverlapping`]
226 - [`slice::rsplit_mut`]
228 - [`slice::swap_with_slice`]
232 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
233 `readme`, and `repository` fields.][cargo/5386]
234 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
235 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
236 a different directory than `target` for placing compilation artifacts.
237 - [Cargo will be adding automatic target inference for binaries, benchmarks,
238 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
239 specific targets e.g. using `[[bin]]` and have other binaries in locations
240 where cargo would infer a binary, Cargo will produce a warning. You can
241 disable this feature ahead of time by setting any of the following `autobins`,
242 `autobenches`, `autoexamples`, `autotests` to false.
243 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
244 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
248 - [Added “The Rustc book” into the official documentation.][49707]
249 [“The Rustc book”] documents and teaches how to use the rustc compiler.
250 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
254 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
255 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
256 compile, `"".is_empty()` will still compile.
257 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
258 will only print the inner type.][48553] e.g.
259 `print!("{:?}", AtomicBool::new(true))` will print `true`
260 not `AtomicBool(true)`.
261 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
262 could enter higher numbers but they were not supported by LLVM. Up to 512MB
263 alignment should cover all use cases.
265 [48553]: https://github.com/rust-lang/rust/pull/48553/
266 [48851]: https://github.com/rust-lang/rust/pull/48851/
267 [48925]: https://github.com/rust-lang/rust/pull/48925/
268 [49533]: https://github.com/rust-lang/rust/pull/49533/
269 [49623]: https://github.com/rust-lang/rust/pull/49623/
270 [49630]: https://github.com/rust-lang/rust/pull/49630/
271 [49664]: https://github.com/rust-lang/rust/pull/49664/
272 [49699]: https://github.com/rust-lang/rust/pull/49699/
273 [49707]: https://github.com/rust-lang/rust/pull/49707/
274 [49719]: https://github.com/rust-lang/rust/pull/49719/
275 [49896]: https://github.com/rust-lang/rust/pull/49896/
276 [49968]: https://github.com/rust-lang/rust/pull/49968/
277 [50177]: https://github.com/rust-lang/rust/pull/50177/
278 [50378]: https://github.com/rust-lang/rust/pull/50378/
279 [50398]: https://github.com/rust-lang/rust/pull/50398/
280 [50423]: https://github.com/rust-lang/rust/pull/50423/
281 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
282 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
283 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
284 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
285 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
286 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
287 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
288 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
289 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
290 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
291 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
292 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
293 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
294 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
295 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
296 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
297 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
298 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
299 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
300 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
301 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
302 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
303 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
304 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
305 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
306 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
307 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
308 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
309 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
310 [“The Rustc book”]: https://doc.rust-lang.org/rustc
313 Version 1.26.2 (2018-06-05)
314 ==========================
319 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics][51117]
321 [51117]: https://github.com/rust-lang/rust/issues/51117
324 Version 1.26.1 (2018-05-29)
325 ==========================
330 - [RLS now works on Windows][50646]
331 - [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
337 - [`fn main() -> impl Trait` no longer works for non-Termination
339 This reverts an accidental stabilization.
340 - [`NaN > NaN` no longer returns true in const-fn contexts][50812]
341 - [Prohibit using turbofish for `impl Trait` in method arguments][50950]
343 [50646]: https://github.com/rust-lang/rust/issues/50646
344 [50656]: https://github.com/rust-lang/rust/pull/50656
345 [50812]: https://github.com/rust-lang/rust/pull/50812
346 [50950]: https://github.com/rust-lang/rust/issues/50950
347 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
349 Version 1.26.0 (2018-05-10)
350 ==========================
354 - [Closures now implement `Copy` and/or `Clone` if all captured variables
355 implement either or both traits.][49299]
356 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
357 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere where a
358 lifetime can be elided.][49458]
359 - [`impl Trait` is now stable allowing you to have abstract types in returns
360 or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
361 `fn open(path: impl AsRef<Path>)`.
362 - [Pattern matching will now automatically apply dereferences.][49394]
363 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
364 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
365 - [A lot of operations are now available in a const context.][46882] E.g. You
366 can now index into constant arrays, reference and dereference into constants,
367 and use Tuple struct constructors.
368 - [Fixed entry slice patterns are now stable.][48516] e.g.
370 let points = [1, 2, 3, 4];
372 [1, 2, 3, 4] => println!("All points were sequential."),
373 _ => println!("Not all points were sequential."),
380 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
381 - [Fixed exponential projection complexity on nested types.][48296]
382 This can provide up to a ~12% reduction in compile times for certain crates.
383 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
384 to remap path prefixes outputted by the compiler.
385 - [Added `powerpc-unknown-netbsd` target.][48281]
389 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
390 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
391 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
392 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
393 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
394 - [`ascii::escape_default` is now available in libcore.][48735]
395 - [Trailing commas are now supported in std and core macros.][48056]
396 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
397 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
402 - [`*const T::copy_to_nonoverlapping`]
403 - [`*const T::copy_to`]
404 - [`*const T::read_unaligned`]
405 - [`*const T::read_volatile`]
408 - [`*const T::wrapping_add`]
409 - [`*const T::wrapping_sub`]
411 - [`*mut T::copy_to_nonoverlapping`]
412 - [`*mut T::copy_to`]
413 - [`*mut T::read_unaligned`]
414 - [`*mut T::read_volatile`]
416 - [`*mut T::replace`]
419 - [`*mut T::wrapping_add`]
420 - [`*mut T::wrapping_sub`]
421 - [`*mut T::write_bytes`]
422 - [`*mut T::write_unaligned`]
423 - [`*mut T::write_volatile`]
426 - [`FromUtf8Error::as_bytes`]
427 - [`LocalKey::try_with`]
429 - [`btree_map::Entry::and_modify`]
430 - [`fs::read_to_string`]
433 - [`hash_map::Entry::and_modify`]
434 - [`iter::FusedIterator`]
435 - [`ops::RangeInclusive`]
436 - [`ops::RangeToInclusive`]
438 - [`slice::rotate_left`]
439 - [`slice::rotate_right`]
445 - [Cargo will now output path to custom commands when `-v` is
446 passed with `--list`][cargo/5041]
447 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
451 - [The second edition of "The Rust Programming Language" book is now recommended
452 over the first.][48404]
457 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
458 syntax is now invalid.
460 use std::ops::Fn as dyn;
461 fn g(_: Box<dyn(std::fmt::Debug)>) {}
463 - [The result of dereferences are no longer promoted to `'static`.][47408]
467 const PAIR: &(i32, i32) = &(0, 1);
468 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
471 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
472 - [`".e0"` will now no longer parse as `0.0` and will instead cause
474 - [Removed hoedown from rustdoc.][48274]
475 - [Bounds on higher-kinded lifetimes a hard error.][48326]
477 [46882]: https://github.com/rust-lang/rust/pull/46882
478 [47379]: https://github.com/rust-lang/rust/pull/47379
479 [47408]: https://github.com/rust-lang/rust/pull/47408
480 [47813]: https://github.com/rust-lang/rust/pull/47813
481 [48056]: https://github.com/rust-lang/rust/pull/48056
482 [48125]: https://github.com/rust-lang/rust/pull/48125
483 [48166]: https://github.com/rust-lang/rust/pull/48166
484 [48235]: https://github.com/rust-lang/rust/pull/48235
485 [48274]: https://github.com/rust-lang/rust/pull/48274
486 [48281]: https://github.com/rust-lang/rust/pull/48281
487 [48296]: https://github.com/rust-lang/rust/pull/48296
488 [48326]: https://github.com/rust-lang/rust/pull/48326
489 [48359]: https://github.com/rust-lang/rust/pull/48359
490 [48404]: https://github.com/rust-lang/rust/pull/48404
491 [48481]: https://github.com/rust-lang/rust/pull/48481
492 [48516]: https://github.com/rust-lang/rust/pull/48516
493 [48628]: https://github.com/rust-lang/rust/pull/48628
494 [48629]: https://github.com/rust-lang/rust/pull/48629
495 [48657]: https://github.com/rust-lang/rust/pull/48657
496 [48735]: https://github.com/rust-lang/rust/pull/48735
497 [48978]: https://github.com/rust-lang/rust/pull/48978
498 [49101]: https://github.com/rust-lang/rust/pull/49101
499 [49109]: https://github.com/rust-lang/rust/pull/49109
500 [49121]: https://github.com/rust-lang/rust/pull/49121
501 [49162]: https://github.com/rust-lang/rust/pull/49162
502 [49184]: https://github.com/rust-lang/rust/pull/49184
503 [49234]: https://github.com/rust-lang/rust/pull/49234
504 [49255]: https://github.com/rust-lang/rust/pull/49255
505 [49299]: https://github.com/rust-lang/rust/pull/49299
506 [49305]: https://github.com/rust-lang/rust/pull/49305
507 [49394]: https://github.com/rust-lang/rust/pull/49394
508 [49458]: https://github.com/rust-lang/rust/pull/49458
509 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
510 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
511 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
512 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
513 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
514 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
515 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
516 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
517 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
518 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
519 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
520 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
521 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
522 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
523 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
524 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
525 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
526 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
527 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
528 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
529 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
530 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
531 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
532 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
533 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
534 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
535 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
536 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
537 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
538 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
539 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
540 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
541 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
542 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
543 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
544 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
545 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
546 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
547 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
548 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
549 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
550 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
553 Version 1.25.0 (2018-03-29)
554 ==========================
558 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
559 - [You can now use nested groups of imports.][47948]
560 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
561 - [You can now have `|` at the start of a match arm.][47947] e.g.
569 | Foo::B => println!("AB"),
570 | Foo::C => println!("C"),
577 - [Upgraded to LLVM 6.][47828]
578 - [Added `-C lto=val` option.][47521]
579 - [Added `i586-unknown-linux-musl` target][47282]
583 - [Impl Send for `process::Command` on Unix.][47760]
584 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
585 - [`UnsafeCell::into_inner` is now safe.][47204]
586 - [Implement libstd for CloudABI.][47268]
587 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
588 - [Implement `AsRef<Path>` for Component][46985]
589 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
590 - [Moved `Duration` to libcore.][46666]
594 - [`Location::column`]
597 The following functions can now be used in a constant expression.
598 eg. `static MINUTE: Duration = Duration::from_secs(60);`
599 - [`Duration::new`][47300]
600 - [`Duration::from_secs`][47300]
601 - [`Duration::from_millis`][47300]
605 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
606 - [`cargo new` now defaults to creating a binary crate, instead of a
607 library crate.][cargo/5029]
611 - [Rust by example is now shipped with new releases][46196]
615 - [Deprecated `net::lookup_host`.][47510]
616 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
617 - The borrow checker was sometimes incorrectly permitting overlapping borrows
618 around indexing operations (see [#47349][47349]). This has been fixed (which also
619 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
620 - [Removed deprecated unstable attribute `#[simd]`.][47251]
622 [33903]: https://github.com/rust-lang/rust/pull/33903
623 [47947]: https://github.com/rust-lang/rust/pull/47947
624 [47948]: https://github.com/rust-lang/rust/pull/47948
625 [47760]: https://github.com/rust-lang/rust/pull/47760
626 [47790]: https://github.com/rust-lang/rust/pull/47790
627 [47828]: https://github.com/rust-lang/rust/pull/47828
628 [47398]: https://github.com/rust-lang/rust/pull/47398
629 [47510]: https://github.com/rust-lang/rust/pull/47510
630 [47521]: https://github.com/rust-lang/rust/pull/47521
631 [47204]: https://github.com/rust-lang/rust/pull/47204
632 [47251]: https://github.com/rust-lang/rust/pull/47251
633 [47268]: https://github.com/rust-lang/rust/pull/47268
634 [47282]: https://github.com/rust-lang/rust/pull/47282
635 [47300]: https://github.com/rust-lang/rust/pull/47300
636 [47349]: https://github.com/rust-lang/rust/pull/47349
637 [46931]: https://github.com/rust-lang/rust/pull/46931
638 [46985]: https://github.com/rust-lang/rust/pull/46985
639 [47006]: https://github.com/rust-lang/rust/pull/47006
640 [46830]: https://github.com/rust-lang/rust/pull/46830
641 [46095]: https://github.com/rust-lang/rust/pull/46095
642 [46666]: https://github.com/rust-lang/rust/pull/46666
643 [46196]: https://github.com/rust-lang/rust/pull/46196
644 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
645 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
646 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
647 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
648 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
651 Version 1.24.1 (2018-03-01)
652 ==========================
654 - [Do not abort when unwinding through FFI][48251]
655 - [Emit UTF-16 files for linker arguments on Windows][48318]
656 - [Make the error index generator work again][48308]
657 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
659 [48251]: https://github.com/rust-lang/rust/issues/48251
660 [48308]: https://github.com/rust-lang/rust/issues/48308
661 [48318]: https://github.com/rust-lang/rust/issues/48318
662 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
665 Version 1.24.0 (2018-02-15)
666 ==========================
670 - [External `sysv64` ffi is now available.][46528]
671 eg. `extern "sysv64" fn foo () {}`
675 - [rustc now uses 16 codegen units by default for release builds.][46910]
676 For the fastest builds, utilize `codegen-units=1`.
677 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
678 - [Add `aarch64-unknown-openbsd` support][46760]
682 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
683 improvement in performance in the majority of cases.
684 - [`OsStr`'s `Debug` implementation is now lossless and consistent
685 with Windows.][46798]
686 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
687 - [impl `From<bool>` for `AtomicBool`][46293]
688 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
689 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
690 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
691 - [float::from_bits now just uses transmute.][46012] This provides
692 some optimisations from LLVM.
693 - [Copied `AsciiExt` methods onto `char`][46077]
694 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
695 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
696 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
697 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
701 - [`RefCell::replace`]
703 - [`atomic::spin_loop_hint`]
705 The following functions can now be used in a constant expression.
706 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
708 - [`AtomicBool::new`][46287]
709 - [`AtomicUsize::new`][46287]
710 - [`AtomicIsize::new`][46287]
711 - [`AtomicPtr::new`][46287]
712 - [`Cell::new`][46287]
713 - [`{integer}::min_value`][46287]
714 - [`{integer}::max_value`][46287]
715 - [`mem::size_of`][46287]
716 - [`mem::align_of`][46287]
717 - [`ptr::null`][46287]
718 - [`ptr::null_mut`][46287]
719 - [`RefCell::new`][46287]
720 - [`UnsafeCell::new`][46287]
724 - [Added a `workspace.default-members` config that
725 overrides implied `--all` in virtual workspaces.][cargo/4743]
726 - [Enable incremental by default on development builds.][cargo/4817] Also added
727 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
728 per-project or global basis respectively.
735 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
736 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
737 in accordance with IETF RFC 4291 §2.2.
738 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
739 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
740 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
741 - [Leading zeros in tuple struct members is now an error][47084]
742 - [`column!()` macro is one-based instead of zero-based][46977]
743 - [`fmt::Arguments` can no longer be shared across threads][45198]
744 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
745 - [Cargo sets a different working directory for the compiler][cargo/4788]
747 [44884]: https://github.com/rust-lang/rust/pull/44884
748 [45198]: https://github.com/rust-lang/rust/pull/45198
749 [45506]: https://github.com/rust-lang/rust/pull/45506
750 [45904]: https://github.com/rust-lang/rust/pull/45904
751 [45990]: https://github.com/rust-lang/rust/pull/45990
752 [46012]: https://github.com/rust-lang/rust/pull/46012
753 [46077]: https://github.com/rust-lang/rust/pull/46077
754 [46094]: https://github.com/rust-lang/rust/pull/46094
755 [46284]: https://github.com/rust-lang/rust/pull/46284
756 [46287]: https://github.com/rust-lang/rust/pull/46287
757 [46293]: https://github.com/rust-lang/rust/pull/46293
758 [46528]: https://github.com/rust-lang/rust/pull/46528
759 [46671]: https://github.com/rust-lang/rust/pull/46671
760 [46713]: https://github.com/rust-lang/rust/pull/46713
761 [46735]: https://github.com/rust-lang/rust/pull/46735
762 [46749]: https://github.com/rust-lang/rust/pull/46749
763 [46760]: https://github.com/rust-lang/rust/pull/46760
764 [46798]: https://github.com/rust-lang/rust/pull/46798
765 [46828]: https://github.com/rust-lang/rust/pull/46828
766 [46831]: https://github.com/rust-lang/rust/pull/46831
767 [46833]: https://github.com/rust-lang/rust/pull/46833
768 [46910]: https://github.com/rust-lang/rust/pull/46910
769 [46977]: https://github.com/rust-lang/rust/pull/46977
770 [47018]: https://github.com/rust-lang/rust/pull/47018
771 [47080]: https://github.com/rust-lang/rust/pull/47080
772 [47084]: https://github.com/rust-lang/rust/pull/47084
773 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
774 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
775 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
776 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
777 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
778 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
781 Version 1.23.0 (2018-01-04)
782 ==========================
786 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
787 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
788 Which should fix some confusing errors in some operations.
792 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
793 undefined behaviour.][45920]
794 - [rustc now suggests renaming import if names clash.][45660]
795 - [Display errors/warnings correctly when there are zero-width or
796 wide characters.][45711]
797 - [rustc now avoids unnecessary copies of arguments that are
798 simple bindings][45380] This should improve memory usage on average by 5-10%.
799 - [Updated musl used to build musl rustc to 1.1.17][45393]
803 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
804 - [Implement Hash for raw pointers to unsized types][45483]
805 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
806 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
807 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
808 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
809 and `<*mut T>::as_mut`][44932]
810 - [Optimized `Thread::{park, unpark}` implementation][45524]
811 - [Improved `SliceExt::binary_search` performance.][45333]
812 - [impl `FromIterator<()>` for `()`][45379]
813 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
821 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
822 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
823 - [Added unit test checking to `cargo check`][cargo/4592]
824 - [Cargo now lets you install a specific version
825 using `cargo install --version`][cargo/4637]
829 - [Releases now ship with the Cargo book documentation.][45692]
830 - [rustdoc now prints rendering warnings on every run.][45324]
834 - [Changes have been made to type equality to make it more correct,
835 in rare cases this could break some code.][45853] [Tracking issue for
836 further information][45852]
837 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
838 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
839 Android 9, the minimum supported version is Android 14.
840 - [Bumped the minimum LLVM to 3.9][45326]
842 [44042]: https://github.com/rust-lang/rust/pull/44042
843 [44932]: https://github.com/rust-lang/rust/pull/44932
844 [45267]: https://github.com/rust-lang/rust/pull/45267
845 [45324]: https://github.com/rust-lang/rust/pull/45324
846 [45326]: https://github.com/rust-lang/rust/pull/45326
847 [45333]: https://github.com/rust-lang/rust/pull/45333
848 [45379]: https://github.com/rust-lang/rust/pull/45379
849 [45380]: https://github.com/rust-lang/rust/pull/45380
850 [45393]: https://github.com/rust-lang/rust/pull/45393
851 [45435]: https://github.com/rust-lang/rust/pull/45435
852 [45483]: https://github.com/rust-lang/rust/pull/45483
853 [45524]: https://github.com/rust-lang/rust/pull/45524
854 [45571]: https://github.com/rust-lang/rust/pull/45571
855 [45580]: https://github.com/rust-lang/rust/pull/45580
856 [45610]: https://github.com/rust-lang/rust/pull/45610
857 [45660]: https://github.com/rust-lang/rust/pull/45660
858 [45692]: https://github.com/rust-lang/rust/pull/45692
859 [45711]: https://github.com/rust-lang/rust/pull/45711
860 [45772]: https://github.com/rust-lang/rust/pull/45772
861 [45852]: https://github.com/rust-lang/rust/issues/45852
862 [45853]: https://github.com/rust-lang/rust/pull/45853
863 [45887]: https://github.com/rust-lang/rust/pull/45887
864 [45920]: https://github.com/rust-lang/rust/pull/45920
865 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
866 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
867 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
870 Version 1.22.1 (2017-11-22)
871 ==========================
873 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
875 [46183]: https://github.com/rust-lang/rust/pull/46183
877 Version 1.22.0 (2017-11-22)
878 ==========================
882 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
883 - [Now accepts underscores in unicode escapes][43716]
884 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
885 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
889 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
890 - [rustc will no longer inline in codegen units when compiling for debug][45075]
891 This should decrease compile times for debug builds.
892 - [strict memory alignment now enabled on ARMv6][45094]
893 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
897 - [Allow atomic operations up to 32 bits
898 on `armv5te_unknown_linux_gnueabi`][44978]
899 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
900 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
901 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
902 - [Properly detect overflow in `Instant += Duration`.][44220]
903 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
904 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
905 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
912 - [Cargo will now build multi file examples in subdirectories of the `examples`
913 folder that have a `main.rs` file.][cargo/4496]
914 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
915 the old format will continue to work and can be updated with `cargo update`.
916 - [Now supports vendoring git repositories][cargo/3992]
920 - [`libbacktrace` is now available on Apple platforms.][44251]
921 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
922 This now lets you specify that a given code example will fail to compile.
926 - [The minimum Android version that rustc can build for has been bumped
927 to `4.0` from `2.3`][45656]
928 - [Allowing `T op= &T` for numeric types has broken some type
929 inference cases][45480]
932 [42526]: https://github.com/rust-lang/rust/pull/42526
933 [43017]: https://github.com/rust-lang/rust/pull/43017
934 [43716]: https://github.com/rust-lang/rust/pull/43716
935 [43949]: https://github.com/rust-lang/rust/pull/43949
936 [44015]: https://github.com/rust-lang/rust/pull/44015
937 [44220]: https://github.com/rust-lang/rust/pull/44220
938 [44251]: https://github.com/rust-lang/rust/pull/44251
939 [44287]: https://github.com/rust-lang/rust/pull/44287
940 [44303]: https://github.com/rust-lang/rust/pull/44303
941 [44456]: https://github.com/rust-lang/rust/pull/44456
942 [44466]: https://github.com/rust-lang/rust/pull/44466
943 [44895]: https://github.com/rust-lang/rust/pull/44895
944 [44966]: https://github.com/rust-lang/rust/pull/44966
945 [44978]: https://github.com/rust-lang/rust/pull/44978
946 [45041]: https://github.com/rust-lang/rust/pull/45041
947 [45064]: https://github.com/rust-lang/rust/pull/45064
948 [45075]: https://github.com/rust-lang/rust/pull/45075
949 [45094]: https://github.com/rust-lang/rust/pull/45094
950 [45095]: https://github.com/rust-lang/rust/pull/45095
951 [45480]: https://github.com/rust-lang/rust/issues/45480
952 [45656]: https://github.com/rust-lang/rust/pull/45656
953 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
954 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
955 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
962 Version 1.21.0 (2017-10-12)
963 ==========================
967 - [You can now use static references for literals.][43838]
971 let x: &'static u32 = &0;
974 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
977 my_macro!(Vec<i32>::new); // Always worked
978 my_macro!(Vec::<i32>::new); // Now works
983 - [Upgraded jemalloc to 4.5.0][43911]
984 - [Enabled unwinding panics on Redox][43917]
985 - [Now runs LLVM in parallel during translation phase.][43506]
986 This should reduce peak memory usage.
990 - [Generate builtin impls for `Clone` for all arrays and tuples that
991 are `T: Clone`][43690]
992 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
993 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
994 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
999 [`std::mem::discriminant`]
1003 - [You can now call `cargo install` with multiple package names][cargo/4216]
1004 - [Cargo commands inside a virtual workspace will now implicitly
1005 pass `--all`][cargo/4335]
1006 - [Added a `[patch]` section to `Cargo.toml` to handle
1007 prepublication dependencies][cargo/4123] [RFC 1969]
1008 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1009 like patterns][cargo/4270]
1010 - [Added the `--all-targets` option][cargo/4400]
1011 - [Using required dependencies as a feature is now deprecated and emits
1012 a warning][cargo/4364]
1017 - [Cargo docs are moving][43916]
1018 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1019 - [The rustdoc book is now available][43863]
1020 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1021 - [Added a preview of RLS has been made available through rustup][44204]
1022 Install with `rustup component add rls-preview`
1023 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1024 Previously only showed `std::os::unix`.
1028 - [Changes in method matching against higher-ranked types][43880] This may cause
1029 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1030 - [rustc's JSON error output's byte position start at top of file.][42973]
1031 Was previously relative to the rustc's internal `CodeMap` struct which
1032 required the unstable library `libsyntax` to correctly use.
1033 - [`unused_results` lint no longer ignores booleans][43728]
1035 [42565]: https://github.com/rust-lang/rust/pull/42565
1036 [42973]: https://github.com/rust-lang/rust/pull/42973
1037 [43348]: https://github.com/rust-lang/rust/pull/43348
1038 [43459]: https://github.com/rust-lang/rust/pull/43459
1039 [43506]: https://github.com/rust-lang/rust/pull/43506
1040 [43540]: https://github.com/rust-lang/rust/pull/43540
1041 [43690]: https://github.com/rust-lang/rust/pull/43690
1042 [43728]: https://github.com/rust-lang/rust/pull/43728
1043 [43838]: https://github.com/rust-lang/rust/pull/43838
1044 [43863]: https://github.com/rust-lang/rust/pull/43863
1045 [43880]: https://github.com/rust-lang/rust/pull/43880
1046 [43911]: https://github.com/rust-lang/rust/pull/43911
1047 [43916]: https://github.com/rust-lang/rust/pull/43916
1048 [43917]: https://github.com/rust-lang/rust/pull/43917
1049 [44204]: https://github.com/rust-lang/rust/pull/44204
1050 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1051 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1052 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1053 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1054 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1055 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1056 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1057 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1058 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1060 Version 1.20.0 (2017-08-31)
1061 ===========================
1065 - [Associated constants are now stabilised.][42809]
1066 - [A lot of macro bugs are now fixed.][42913]
1071 - [Struct fields are now properly coerced to the expected field type.][42807]
1072 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1073 `wasm32-experimental-emscripten` target.
1074 - [Changed some of the error messages to be more helpful.][42033]
1075 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1077 - [rustc now reports the total number of errors on compilation failure][43015]
1078 previously this was only the number of errors in the pass that failed.
1079 - [Expansion in rustc has been sped up 29x.][42533]
1080 - [added `msp430-none-elf` target.][43099]
1081 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1083 - [Fixes backtraces on Redox][43228]
1084 - [rustc now identifies different versions of same crate when absolute paths of
1085 different types match in an error message.][42826]
1091 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1092 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1094 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1095 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1096 - [Impl `Clone` for `DefaultHasher`.][42799]
1097 - [Impl `Sync` for `SyncSender`.][42397]
1098 - [Impl `FromStr` for `char`][42271]
1099 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1101 - [allow messages in the `unimplemented!()` macro.][42155]
1102 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1103 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1104 - [Upgrade to Unicode 10.0.0][42999]
1105 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1106 - [Skip the main thread's manual stack guard on Linux][43072]
1107 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1108 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1110 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1115 - [`CStr::into_c_string`]
1116 - [`CString::as_c_str`]
1117 - [`CString::into_boxed_c_str`]
1118 - [`Chain::get_mut`]
1119 - [`Chain::get_ref`]
1120 - [`Chain::into_inner`]
1121 - [`Option::get_or_insert_with`]
1122 - [`Option::get_or_insert`]
1123 - [`OsStr::into_os_string`]
1124 - [`OsString::into_boxed_os_str`]
1127 - [`Utf8Error::error_len`]
1128 - [`char::EscapeDebug`]
1129 - [`char::escape_debug`]
1130 - [`compile_error!`]
1131 - [`f32::from_bits`]
1133 - [`f64::from_bits`]
1135 - [`mem::ManuallyDrop`]
1136 - [`slice::sort_unstable_by_key`]
1137 - [`slice::sort_unstable_by`]
1138 - [`slice::sort_unstable`]
1139 - [`str::from_boxed_utf8_unchecked`]
1140 - [`str::as_bytes_mut`]
1141 - [`str::as_bytes_mut`]
1142 - [`str::from_utf8_mut`]
1143 - [`str::from_utf8_unchecked_mut`]
1145 - [`str::get_unchecked_mut`]
1146 - [`str::get_unchecked`]
1148 - [`str::into_boxed_bytes`]
1153 - [Cargo API token location moved from `~/.cargo/config` to
1154 `~/.cargo/credentials`.][cargo/3978]
1155 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1156 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1157 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1158 - [You can now specify version of a binary when installed through
1159 `cargo install` using `--vers`.][cargo/4229]
1160 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1161 failure.][cargo/4248]
1162 - [Changed the convention around which file is the crate root.][cargo/4259]
1163 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1164 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1169 - [Functions with `'static` in their return types will now not be as usable as
1170 if they were using lifetime parameters instead.][42417]
1171 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1172 takes the sign of NaN into account where previously didn't.][42430]
1174 [42033]: https://github.com/rust-lang/rust/pull/42033
1175 [42155]: https://github.com/rust-lang/rust/pull/42155
1176 [42271]: https://github.com/rust-lang/rust/pull/42271
1177 [42397]: https://github.com/rust-lang/rust/pull/42397
1178 [42417]: https://github.com/rust-lang/rust/pull/42417
1179 [42430]: https://github.com/rust-lang/rust/pull/42430
1180 [42431]: https://github.com/rust-lang/rust/pull/42431
1181 [42533]: https://github.com/rust-lang/rust/pull/42533
1182 [42571]: https://github.com/rust-lang/rust/pull/42571
1183 [42613]: https://github.com/rust-lang/rust/pull/42613
1184 [42799]: https://github.com/rust-lang/rust/pull/42799
1185 [42807]: https://github.com/rust-lang/rust/pull/42807
1186 [42809]: https://github.com/rust-lang/rust/pull/42809
1187 [42822]: https://github.com/rust-lang/rust/pull/42822
1188 [42826]: https://github.com/rust-lang/rust/pull/42826
1189 [42854]: https://github.com/rust-lang/rust/pull/42854
1190 [42913]: https://github.com/rust-lang/rust/pull/42913
1191 [42999]: https://github.com/rust-lang/rust/pull/42999
1192 [43011]: https://github.com/rust-lang/rust/pull/43011
1193 [43015]: https://github.com/rust-lang/rust/pull/43015
1194 [43072]: https://github.com/rust-lang/rust/pull/43072
1195 [43077]: https://github.com/rust-lang/rust/pull/43077
1196 [43097]: https://github.com/rust-lang/rust/pull/43097
1197 [43099]: https://github.com/rust-lang/rust/pull/43099
1198 [43170]: https://github.com/rust-lang/rust/pull/43170
1199 [43178]: https://github.com/rust-lang/rust/pull/43178
1200 [43185]: https://github.com/rust-lang/rust/pull/43185
1201 [43228]: https://github.com/rust-lang/rust/pull/43228
1202 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1203 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1204 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1205 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1206 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1207 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1208 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1209 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1210 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1211 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1212 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1213 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1214 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1215 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1216 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1217 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1218 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1219 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1220 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1221 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1222 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1223 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1224 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1225 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1226 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1227 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1228 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1229 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1230 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1231 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1232 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1233 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1234 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1235 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1236 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1237 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1238 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1239 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1240 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1243 Version 1.19.0 (2017-07-20)
1244 ===========================
1249 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1250 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1251 - [Macro recursion limit increased to 1024 from 64.][41676]
1252 - [Added lint for detecting unused macros.][41907]
1253 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1254 For example: `let x = loop { break 7; };`
1255 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1256 contain `Copy` types and cannot have a `Drop` implementation.
1257 Example: `union Foo { bar: u8, baz: usize }`
1258 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1259 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1264 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1265 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1266 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1267 you should use `--target armv7-linux-androideabi`.
1268 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1269 - [Minor optimisation of string operations.][42037]
1270 - [Compiler error message is now `aborting due to previous error(s)` instead of
1271 `aborting due to N previous errors`][42150] This was previously inaccurate and
1272 would only count certain kinds of errors.
1273 - [The compiler now supports Visual Studio 2017][42225]
1274 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1275 - [Added a lot][42264] of [new error codes][42302]
1276 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1277 libraries with C Run-time Libraries(CRT) to be statically linked.
1278 - [Fixed various ARM codegen bugs][42740]
1283 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1284 `Extend<Cow<'a, str>>`][41449]
1285 - [`Vec` now implements `From<&mut [T]>`][41530]
1286 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1287 - [`SplitWhitespace` now implements `Clone`][41659]
1288 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1290 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1291 macros, but for printing to stderr.
1296 - [`OsString::shrink_to_fit`]
1299 - [`thread::ThreadId`]
1304 - [Build scripts can now add environment variables to the environment
1305 the crate is being compiled in.
1306 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1307 - [Subcommands now replace the current process rather than spawning a new
1308 child process][cargo/3970]
1309 - [Workspace members can now accept glob file patterns][cargo/3979]
1310 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1311 the members in a given workspace.][cargo/3988]
1312 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1313 - [Target directory path is now in the cargo metadata][cargo/4022]
1314 - [Cargo no longer checks out a local working directory for the
1315 crates.io index][cargo/4026] This should provide smaller file size for the
1316 registry, and improve cloning times, especially on Windows machines.
1317 - [Added an `--exclude` option for excluding certain packages when using the
1318 `--all` option][cargo/4031]
1319 - [Cargo will now automatically retry when receiving a 5xx error
1320 from crates.io][cargo/4032]
1321 - [The `--features` option now accepts multiple comma or space
1322 delimited values.][cargo/4084]
1323 - [Added support for custom target specific runners][cargo/3954]
1328 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1330 - [Rust will now release XZ compressed packages][rust-installer/57]
1331 - [rustup will now prefer to download rust packages with
1332 XZ compression][rustup/1100] over GZip packages.
1333 - [Added the ability to escape `#` in rust documentation][41785] By adding
1334 additional `#`'s ie. `##` is now `#`
1339 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1340 - [`-Z` flags are now no longer allowed to be used on the stable
1341 compiler.][41751] This has been a warning for a year previous to this.
1342 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1343 longer works][42844]. Users should migrate to the built-in `check`
1344 command, which has been available since 1.16.
1345 - [Ending a float literal with `._` is now a hard error.
1346 Example: `42._` .][41946]
1347 - [Any use of a private `extern crate` outside of its module is now a
1348 hard error.][36886] This was previously a warning.
1349 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1350 relative while the `::` prefix makes a path absolute, but was ignored and the
1351 path was relative regardless.
1352 - [Floating point constants in match patterns is now a hard error][36890]
1353 This was previously a warning.
1354 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1355 match patterns is now a hard error][36891] This was previously a warning.
1356 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1358 - [From the pound escape, lines consisting of multiple `#`s are
1360 - [It is an error to re-export private enum variants][42460]. This is
1361 known to break a number of crates that depend on an older version of
1363 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1364 to use it to find the linker, and the build will fail where it did
1365 not previously][42607]
1367 [36886]: https://github.com/rust-lang/rust/issues/36886
1368 [36888]: https://github.com/rust-lang/rust/issues/36888
1369 [36890]: https://github.com/rust-lang/rust/issues/36890
1370 [36891]: https://github.com/rust-lang/rust/issues/36891
1371 [36892]: https://github.com/rust-lang/rust/issues/36892
1372 [37406]: https://github.com/rust-lang/rust/issues/37406
1373 [39983]: https://github.com/rust-lang/rust/pull/39983
1374 [41145]: https://github.com/rust-lang/rust/pull/41145
1375 [41192]: https://github.com/rust-lang/rust/pull/41192
1376 [41258]: https://github.com/rust-lang/rust/pull/41258
1377 [41370]: https://github.com/rust-lang/rust/pull/41370
1378 [41449]: https://github.com/rust-lang/rust/pull/41449
1379 [41530]: https://github.com/rust-lang/rust/pull/41530
1380 [41624]: https://github.com/rust-lang/rust/pull/41624
1381 [41656]: https://github.com/rust-lang/rust/pull/41656
1382 [41659]: https://github.com/rust-lang/rust/pull/41659
1383 [41676]: https://github.com/rust-lang/rust/pull/41676
1384 [41751]: https://github.com/rust-lang/rust/pull/41751
1385 [41764]: https://github.com/rust-lang/rust/pull/41764
1386 [41785]: https://github.com/rust-lang/rust/pull/41785
1387 [41873]: https://github.com/rust-lang/rust/pull/41873
1388 [41907]: https://github.com/rust-lang/rust/pull/41907
1389 [41946]: https://github.com/rust-lang/rust/pull/41946
1390 [42016]: https://github.com/rust-lang/rust/pull/42016
1391 [42037]: https://github.com/rust-lang/rust/pull/42037
1392 [42068]: https://github.com/rust-lang/rust/pull/42068
1393 [42150]: https://github.com/rust-lang/rust/pull/42150
1394 [42162]: https://github.com/rust-lang/rust/pull/42162
1395 [42225]: https://github.com/rust-lang/rust/pull/42225
1396 [42264]: https://github.com/rust-lang/rust/pull/42264
1397 [42302]: https://github.com/rust-lang/rust/pull/42302
1398 [42460]: https://github.com/rust-lang/rust/issues/42460
1399 [42607]: https://github.com/rust-lang/rust/issues/42607
1400 [42740]: https://github.com/rust-lang/rust/pull/42740
1401 [42844]: https://github.com/rust-lang/rust/issues/42844
1402 [42948]: https://github.com/rust-lang/rust/pull/42948
1403 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1404 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1405 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1406 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1407 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1408 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1409 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1410 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1411 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1412 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1413 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1414 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1415 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1416 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1417 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1418 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1419 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1420 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1421 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1422 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1423 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1424 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1427 Version 1.18.0 (2017-06-08)
1428 ===========================
1433 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1434 make the item visible to just that module tree. Also accepts the keyword
1435 `crate` to make something public to the whole crate but not users of the
1436 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1437 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1438 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1439 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1440 types like `Write + Send`, trailing `+` are now supported in trait objects,
1441 and better error reporting for trait objects starting with `?Sized`.
1442 - [0e+10 is now a valid floating point literal][40589]
1443 - [Now warns if you bind a lifetime parameter to 'static][40734]
1444 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1445 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1446 representation in some cases.][40377]
1451 - [rustc can now emit mir with `--emit mir`][39891]
1452 - [Improved LLVM IR for trivial functions][40367]
1453 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1454 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1455 opportunities found through profiling
1456 - [Improved backtrace formatting when panicking][38165]
1461 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1462 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1463 iteration or reallocation.
1464 - [Simplified HashMap Bucket interface][40561] provides performance
1465 improvements for iterating and cloning.
1466 - [Specialize Vec::from_elem to use calloc][40409]
1467 - [Fixed Race condition in fs::create_dir_all][39799]
1468 - [No longer caching stdio on Windows][40516]
1469 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1470 2.50%~ faster and in one case now 12.50% faster.
1471 - [Optimized `AtomicBool::fetch_nand`][41143]
1476 - [`Child::try_wait`]
1477 - [`HashMap::retain`]
1478 - [`HashSet::retain`]
1480 - [`TcpStream::peek`]
1481 - [`UdpSocket::peek`]
1482 - [`UdpSocket::peek_from`]
1487 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1488 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1489 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1490 - [Added Android build support][cargo/3885]
1491 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1492 of a certain type, for example `cargo build --bins` will build all
1494 - [Added support for haiku][cargo/3952]
1499 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1500 - [Added rust-windbg script for better debugging on Windows][39983]
1501 - [Rust now uses the official cross compiler for NetBSD][40612]
1502 - [rustdoc now accepts `#` at the start of files][40828]
1503 - [Fixed jemalloc support for musl][41168]
1508 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1509 always placed after the sign if it exists and before the digits. With the `#`
1510 flag the zeroes are placed after the prefix and before the digits.
1511 - [Due to the struct field optimisation][40377], using `transmute` on structs
1512 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1513 always been undefined behavior, but is now more likely to break in practice.
1514 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1515 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1516 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1517 - [Overlapping inherent `impl`s are now a hard error][40728]
1518 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1519 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1520 `out.asm` and `out.ll` instead of only one of the filetypes.
1521 - [ calling a function that returns `Self` will no longer work][41805] when
1522 the size of `Self` cannot be statically determined.
1523 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1524 this has caused a few regressions namely:
1526 - Changed the link order of local static/dynamic libraries (respecting the
1527 order on given rather than having the compiler reorder).
1528 - Changed how MinGW is linked, native code linked to dynamic libraries
1529 may require manually linking to the gcc support library (for the native
1532 [38165]: https://github.com/rust-lang/rust/pull/38165
1533 [39799]: https://github.com/rust-lang/rust/pull/39799
1534 [39891]: https://github.com/rust-lang/rust/pull/39891
1535 [39983]: https://github.com/rust-lang/rust/pull/39983
1536 [40043]: https://github.com/rust-lang/rust/pull/40043
1537 [40241]: https://github.com/rust-lang/rust/pull/40241
1538 [40338]: https://github.com/rust-lang/rust/pull/40338
1539 [40367]: https://github.com/rust-lang/rust/pull/40367
1540 [40377]: https://github.com/rust-lang/rust/pull/40377
1541 [40409]: https://github.com/rust-lang/rust/pull/40409
1542 [40516]: https://github.com/rust-lang/rust/pull/40516
1543 [40556]: https://github.com/rust-lang/rust/pull/40556
1544 [40561]: https://github.com/rust-lang/rust/pull/40561
1545 [40589]: https://github.com/rust-lang/rust/pull/40589
1546 [40612]: https://github.com/rust-lang/rust/pull/40612
1547 [40723]: https://github.com/rust-lang/rust/pull/40723
1548 [40728]: https://github.com/rust-lang/rust/pull/40728
1549 [40731]: https://github.com/rust-lang/rust/pull/40731
1550 [40734]: https://github.com/rust-lang/rust/pull/40734
1551 [40805]: https://github.com/rust-lang/rust/pull/40805
1552 [40807]: https://github.com/rust-lang/rust/pull/40807
1553 [40828]: https://github.com/rust-lang/rust/pull/40828
1554 [40870]: https://github.com/rust-lang/rust/pull/40870
1555 [41085]: https://github.com/rust-lang/rust/pull/41085
1556 [41143]: https://github.com/rust-lang/rust/pull/41143
1557 [41168]: https://github.com/rust-lang/rust/pull/41168
1558 [41270]: https://github.com/rust-lang/rust/issues/41270
1559 [41469]: https://github.com/rust-lang/rust/pull/41469
1560 [41805]: https://github.com/rust-lang/rust/issues/41805
1561 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1562 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1563 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1564 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1565 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1566 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1567 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1568 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1569 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1570 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1571 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1572 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1573 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1574 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1577 Version 1.17.0 (2017-04-27)
1578 ===========================
1583 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1584 * [Fields of structs may be initialized without duplicating the field/variable
1585 names][39761]. [RFC 1682]
1586 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1587 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1588 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1589 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1590 `'b`. Soundness fix.
1591 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1592 * [Static variables may contain references to other statics][40027]
1597 * [Exit quickly on only `--emit dep-info`][40336]
1598 * [Make `-C relocation-model` more correctly determine whether the linker
1599 creates a position-independent executable][40245]
1600 * [Add `-C overflow-checks` to directly control whether integer overflow
1602 * [The rustc type checker now checks items on demand instead of in a single
1603 in-order pass][40008]. This is mostly an internal refactoring in support of
1604 future work, including incremental type checking, but also resolves [RFC
1605 1647], allowing `Self` to appear in `impl` `where` clauses.
1606 * [Optimize vtable loads][39995]
1607 * [Turn off vectorization for Emscripten targets][39990]
1608 * [Provide suggestions for unknown macros imported with `use`][39953]
1609 * [Fix ICEs in path resolution][39939]
1610 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1611 * [Add clearer error message using `&str + &str`][39116]
1622 * [`Ordering::then`]
1623 * [`Ordering::then_with`]
1624 * [`BTreeMap::range`]
1625 * [`BTreeMap::range_mut`]
1626 * [`collections::Bound`]
1627 * [`process::abort`]
1628 * [`ptr::read_unaligned`]
1629 * [`ptr::write_unaligned`]
1630 * [`Result::expect_err`]
1633 * [`Cell::into_inner`]
1639 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1640 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1641 * [`String` implements `FromIterator<&char>`][40028]
1642 * `Box` [implements][40009] a number of new conversions:
1643 `From<Box<str>> for String`,
1644 `From<Box<[T]>> for Vec<T>`,
1645 `From<Box<CStr>> for CString`,
1646 `From<Box<OsStr>> for OsString`,
1647 `From<Box<Path>> for PathBuf`,
1648 `Into<Box<str>> for String`,
1649 `Into<Box<[T]>> for Vec<T>`,
1650 `Into<Box<CStr>> for CString`,
1651 `Into<Box<OsStr>> for OsString`,
1652 `Into<Box<Path>> for PathBuf`,
1653 `Default for Box<str>`,
1654 `Default for Box<CStr>`,
1655 `Default for Box<OsStr>`,
1656 `From<&CStr> for Box<CStr>`,
1657 `From<&OsStr> for Box<OsStr>`,
1658 `From<&Path> for Box<Path>`
1659 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1660 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1661 * [Slightly optimize `slice::sort`][39538]
1662 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1663 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1664 `Box<str>` implements `From<&str>`][39438]
1665 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1666 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1667 * [`format!` estimates the needed capacity before writing a string][39356]
1668 * [Support unprivileged symlink creation in Windows][38921]
1669 * [`PathBuf` implements `Default`][38764]
1670 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1671 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1672 and poor hash functions.
1677 * [Add `cargo check --all`][cargo/3731]
1678 * [Add an option to ignore SSL revocation checking][cargo/3699]
1679 * [Add `cargo run --package`][cargo/3691]
1680 * [Add `required_features`][cargo/3667]
1681 * [Assume `build.rs` is a build script][cargo/3664]
1682 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1687 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1689 * [The "Unstable Book" documents nightly-only features][ubook]
1690 * [Improve the style of the sidebar in rustdoc output][40265]
1691 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1692 * [Fix MSP430 breakage due to `i128`][40257]
1693 * [Preliminary Solaris/SPARCv9 support][39903]
1694 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1695 run without installing the MSVC runtime.
1696 * [`rustdoc --test` includes file names in test names][39788]
1697 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1698 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1699 * [Initial support for `aarch64-unknown-freebsd`][39491]
1700 * [Initial support for `i686-unknown-netbsd`][39426]
1701 * [This release no longer includes the old makefile build system][39431]. Rust
1702 is built with a custom build system, written in Rust, and with Cargo.
1703 * [Add Debug implementations for libcollection structs][39002]
1704 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1705 * [`--test-threads=0` produces an error][38945]
1706 * [`rustup` installs documentation by default][40526]
1707 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1708 WinDbg and Visual Studio to improve the debugging experience.
1713 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1714 workaround, either use MSVC 2015 or run vcvars.bat.
1715 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1716 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1717 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1719 * [`format!` and `Display::to_string` panic if an underlying formatting
1720 implementation returns an error][40117]. Previously the error was silently
1721 ignored. It is incorrect for `write_fmt` to return an error when writing
1723 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1724 crates were marked stable and could be accessed from the stable toolchain.
1725 * [Rust git source no longer includes vendored crates][39728]. Those that need
1726 to build with vendored crates should build from release tarballs.
1727 * [Fix inert attributes from `proc_macro_derives`][39572]
1728 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1729 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1731 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1732 existing code generally ignores the type of dead-code unless a type-hint is
1733 provided; this can cause surprising inference interactions particularly around
1734 defaulting. The new code uniformly ignores the result type of dead-code.
1735 * [Tuple-struct constructors with private fields are no longer visible][38932]
1736 * [Lifetime parameters that do not appear in the arguments are now considered
1737 early-bound][38897], resolving a soundness bug (#[32330]). The
1738 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1740 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1741 * [Make transmuting from fn item types to pointer-sized types a hard
1744 [27787]: https://github.com/rust-lang/rust/issues/27787
1745 [32330]: https://github.com/rust-lang/rust/issues/32330
1746 [34198]: https://github.com/rust-lang/rust/pull/34198
1747 [38161]: https://github.com/rust-lang/rust/pull/38161
1748 [38368]: https://github.com/rust-lang/rust/pull/38368
1749 [38584]: https://github.com/rust-lang/rust/issues/38584
1750 [38661]: https://github.com/rust-lang/rust/pull/38661
1751 [38764]: https://github.com/rust-lang/rust/pull/38764
1752 [38864]: https://github.com/rust-lang/rust/issues/38864
1753 [38897]: https://github.com/rust-lang/rust/pull/38897
1754 [38921]: https://github.com/rust-lang/rust/pull/38921
1755 [38932]: https://github.com/rust-lang/rust/pull/38932
1756 [38945]: https://github.com/rust-lang/rust/pull/38945
1757 [38981]: https://github.com/rust-lang/rust/pull/38981
1758 [39002]: https://github.com/rust-lang/rust/pull/39002
1759 [39116]: https://github.com/rust-lang/rust/pull/39116
1760 [39193]: https://github.com/rust-lang/rust/pull/39193
1761 [39265]: https://github.com/rust-lang/rust/pull/39265
1762 [39356]: https://github.com/rust-lang/rust/pull/39356
1763 [39372]: https://github.com/rust-lang/rust/pull/39372
1764 [39426]: https://github.com/rust-lang/rust/pull/39426
1765 [39431]: https://github.com/rust-lang/rust/pull/39431
1766 [39438]: https://github.com/rust-lang/rust/pull/39438
1767 [39440]: https://github.com/rust-lang/rust/pull/39440
1768 [39485]: https://github.com/rust-lang/rust/pull/39485
1769 [39491]: https://github.com/rust-lang/rust/pull/39491
1770 [39518]: https://github.com/rust-lang/rust/pull/39518
1771 [39538]: https://github.com/rust-lang/rust/pull/39538
1772 [39572]: https://github.com/rust-lang/rust/pull/39572
1773 [39633]: https://github.com/rust-lang/rust/pull/39633
1774 [39642]: https://github.com/rust-lang/rust/pull/39642
1775 [39728]: https://github.com/rust-lang/rust/pull/39728
1776 [39761]: https://github.com/rust-lang/rust/pull/39761
1777 [39788]: https://github.com/rust-lang/rust/pull/39788
1778 [39793]: https://github.com/rust-lang/rust/pull/39793
1779 [39837]: https://github.com/rust-lang/rust/pull/39837
1780 [39843]: https://github.com/rust-lang/rust/pull/39843
1781 [39851]: https://github.com/rust-lang/rust/pull/39851
1782 [39903]: https://github.com/rust-lang/rust/pull/39903
1783 [39939]: https://github.com/rust-lang/rust/pull/39939
1784 [39953]: https://github.com/rust-lang/rust/pull/39953
1785 [39960]: https://github.com/rust-lang/rust/pull/39960
1786 [39990]: https://github.com/rust-lang/rust/pull/39990
1787 [39995]: https://github.com/rust-lang/rust/pull/39995
1788 [40008]: https://github.com/rust-lang/rust/pull/40008
1789 [40009]: https://github.com/rust-lang/rust/pull/40009
1790 [40027]: https://github.com/rust-lang/rust/pull/40027
1791 [40028]: https://github.com/rust-lang/rust/pull/40028
1792 [40037]: https://github.com/rust-lang/rust/pull/40037
1793 [40117]: https://github.com/rust-lang/rust/pull/40117
1794 [40166]: https://github.com/rust-lang/rust/pull/40166
1795 [40245]: https://github.com/rust-lang/rust/pull/40245
1796 [40257]: https://github.com/rust-lang/rust/pull/40257
1797 [40261]: https://github.com/rust-lang/rust/pull/40261
1798 [40265]: https://github.com/rust-lang/rust/pull/40265
1799 [40319]: https://github.com/rust-lang/rust/pull/40319
1800 [40336]: https://github.com/rust-lang/rust/pull/40336
1801 [40526]: https://github.com/rust-lang/rust/pull/40526
1802 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1803 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1804 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1805 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1806 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1807 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1808 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1809 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1810 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1811 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1812 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1813 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1814 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1815 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1816 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1817 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1818 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1819 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1820 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1821 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1822 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1823 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1824 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1825 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1826 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1827 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1828 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1829 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1830 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1831 [mdbook]: https://crates.io/crates/mdbook
1832 [ubook]: https://doc.rust-lang.org/unstable-book/
1835 Version 1.16.0 (2017-03-16)
1836 ===========================
1841 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1842 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1843 match patterns][38069]
1844 * [Clean up semantics of `self` in an import list][38313]
1845 * [`Self` may appear in `impl` headers][38920]
1846 * [`Self` may appear in struct expressions][39282]
1851 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1852 a `.rmeta` file containing only crate metadata][38571]. This can be
1853 used by tools like the Rust Language Service to perform
1854 metadata-only builds.
1855 * [Levenshtein based typo suggestions now work in most places, while
1856 previously they worked only for fields and sometimes for local
1857 variables][38927]. Together with the overhaul of "no
1858 resolution"/"unexpected resolution" errors (#[38154]) they result in
1859 large and systematic improvement in resolution diagnostics.
1860 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1862 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1863 * [`rustc` no longer attempts to provide "consider using an explicit
1864 lifetime" suggestions][37057]. They were inaccurate.
1869 * [`VecDeque::truncate`]
1870 * [`VecDeque::resize`]
1871 * [`String::insert_str`]
1872 * [`Duration::checked_add`]
1873 * [`Duration::checked_sub`]
1874 * [`Duration::checked_div`]
1875 * [`Duration::checked_mul`]
1878 * [`SocketAddr::is_ipv4`]
1879 * [`SocketAddr::is_ipv6`]
1880 * [`IpAddr::is_ipv4`]
1881 * [`IpAddr::is_ipv6`]
1883 * [`Vec::dedup_by_key`]
1884 * [`Result::unwrap_or_default`]
1885 * [`<*const T>::wrapping_offset`]
1886 * [`<*mut T>::wrapping_offset`]
1887 * `CommandExt::creation_flags`
1888 * [`File::set_permissions`]
1889 * [`String::split_off`]
1894 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1895 their argument by `Borrow` parameter][37761]
1896 * [All public types in std implement `Debug`][38006]
1897 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1898 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1899 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1901 * [std: Fix partial writes in `LineWriter`][38062]
1902 * [std: Clamp max read/write sizes on Unix][38062]
1903 * [Use more specific panic message for `&str` slicing errors][38066]
1904 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1905 functionality cannot be achieved in std currently.
1906 * [`writeln!`, like `println!`, now accepts a form with no string
1907 or formatting arguments, to just print a newline][38469]
1908 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1909 * [Reduce the size of static data in `std_unicode::tables`][38781]
1910 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1911 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1913 * [`Duration` implements `Sum`][38712]
1914 * [`String` implements `ToSocketAddrs`][39048]
1919 * [The `cargo check` command does a type check of a project without
1920 building it][cargo/3296]
1921 * [crates.io will display CI badges from Travis and AppVeyor, if
1922 specified in Cargo.toml][cargo/3546]
1923 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1924 * [Compilation profiles accept integer values for `debug`, in addition
1925 to `true` and `false`. These are passed to `rustc` as the value to
1926 `-C debuginfo`][cargo/3534]
1927 * [Implement `cargo --version --verbose`][cargo/3604]
1928 * [All builds now output 'dep-info' build dependencies compatible with
1929 make and ninja][cargo/3557]
1930 * [Build all workspace members with `build --all`][cargo/3511]
1931 * [Document all workspace members with `doc --all`][cargo/3515]
1932 * [Path deps outside workspace are not members][cargo/3443]
1937 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1938 the path to the Rust implementation][38589]
1939 * [The `armv7-linux-androideabi` target no longer enables NEON
1940 extensions, per Google's ABI guide][38413]
1941 * [The stock standard library can be compiled for Redox OS][38401]
1942 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1944 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1946 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1951 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1952 match patterns][38069]
1953 * In this release, references to uninhabited types can not be
1954 pattern-matched. This was accidentally allowed in 1.15.
1955 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1956 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1958 * [Clean up semantics of `self` in an import list][38313]
1959 * Reimplemented lifetime elision. This change was almost entirely compatible
1960 with existing code, but it did close a number of small bugs and loopholes,
1961 as well as being more accepting in some other [cases][41105].
1963 [37057]: https://github.com/rust-lang/rust/pull/37057
1964 [37761]: https://github.com/rust-lang/rust/pull/37761
1965 [38006]: https://github.com/rust-lang/rust/pull/38006
1966 [38051]: https://github.com/rust-lang/rust/pull/38051
1967 [38062]: https://github.com/rust-lang/rust/pull/38062
1968 [38062]: https://github.com/rust-lang/rust/pull/38622
1969 [38066]: https://github.com/rust-lang/rust/pull/38066
1970 [38069]: https://github.com/rust-lang/rust/pull/38069
1971 [38131]: https://github.com/rust-lang/rust/pull/38131
1972 [38154]: https://github.com/rust-lang/rust/pull/38154
1973 [38274]: https://github.com/rust-lang/rust/pull/38274
1974 [38304]: https://github.com/rust-lang/rust/pull/38304
1975 [38313]: https://github.com/rust-lang/rust/pull/38313
1976 [38314]: https://github.com/rust-lang/rust/pull/38314
1977 [38327]: https://github.com/rust-lang/rust/pull/38327
1978 [38401]: https://github.com/rust-lang/rust/pull/38401
1979 [38413]: https://github.com/rust-lang/rust/pull/38413
1980 [38469]: https://github.com/rust-lang/rust/pull/38469
1981 [38559]: https://github.com/rust-lang/rust/pull/38559
1982 [38571]: https://github.com/rust-lang/rust/pull/38571
1983 [38580]: https://github.com/rust-lang/rust/pull/38580
1984 [38589]: https://github.com/rust-lang/rust/pull/38589
1985 [38670]: https://github.com/rust-lang/rust/pull/38670
1986 [38712]: https://github.com/rust-lang/rust/pull/38712
1987 [38726]: https://github.com/rust-lang/rust/pull/38726
1988 [38781]: https://github.com/rust-lang/rust/pull/38781
1989 [38798]: https://github.com/rust-lang/rust/pull/38798
1990 [38909]: https://github.com/rust-lang/rust/pull/38909
1991 [38920]: https://github.com/rust-lang/rust/pull/38920
1992 [38927]: https://github.com/rust-lang/rust/pull/38927
1993 [39048]: https://github.com/rust-lang/rust/pull/39048
1994 [39282]: https://github.com/rust-lang/rust/pull/39282
1995 [39379]: https://github.com/rust-lang/rust/pull/39379
1996 [41105]: https://github.com/rust-lang/rust/issues/41105
1997 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1998 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1999 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2000 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2001 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2002 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2003 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2004 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2005 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2006 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2007 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2008 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2009 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2010 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2011 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2012 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2013 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2014 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2015 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2016 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2017 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2018 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2019 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2020 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2021 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2022 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2023 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2024 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2025 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2026 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2029 Version 1.15.1 (2017-02-09)
2030 ===========================
2032 * [Fix IntoIter::as_mut_slice's signature][39466]
2033 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2035 [39466]: https://github.com/rust-lang/rust/pull/39466
2036 [39523]: https://github.com/rust-lang/rust/pull/39523
2039 Version 1.15.0 (2017-02-02)
2040 ===========================
2045 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2046 stable. This allows popular code-generating crates like Serde and Diesel to
2047 work ergonomically. [RFC 1681].
2048 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2049 with curly braces][36868]. Part of [RFC 1506].
2050 * [A number of minor changes to name resolution have been activated][37127].
2051 They add up to more consistent semantics, allowing for future evolution of
2052 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2053 details of what is different. The breaking changes here have been transitioned
2054 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2055 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2057 * [`?Sized` can be used in `where` clauses][37791]
2058 * [There is now a limit on the size of monomorphized types and it can be
2059 modified with the `#![type_size_limit]` crate attribute, similarly to
2060 the `#![recursion_limit]` attribute][37789]
2065 * [On Windows, the compiler will apply dllimport attributes when linking to
2066 extern functions][37973]. Additional attributes and flags can control which
2067 library kind is linked and its name. [RFC 1717].
2068 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2069 * [The `--test` flag works with procedural macro crates][38107]
2070 * [Fix `extern "aapcs" fn` ABI][37814]
2071 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2072 * [The `format!` expander recognizes incorrect `printf` and shell-style
2073 formatting directives and suggests the correct format][37613].
2074 * [Only report one error for all unused imports in an import list][37456]
2076 Compiler Performance
2077 --------------------
2079 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2080 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2081 * [Don't clone in `UnificationTable::probe`][37848]
2082 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2083 * [Use small vectors in type walker][37760]
2084 * [Macro expansion performance was improved][37701]
2085 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2086 * [Replace FNV with a faster hash function][37229]
2091 * [`std::iter::Iterator::min_by`]
2092 * [`std::iter::Iterator::max_by`]
2093 * [`std::os::*::fs::FileExt`]
2094 * [`std::sync::atomic::Atomic*::get_mut`]
2095 * [`std::sync::atomic::Atomic*::into_inner`]
2096 * [`std::vec::IntoIter::as_slice`]
2097 * [`std::vec::IntoIter::as_mut_slice`]
2098 * [`std::sync::mpsc::Receiver::try_iter`]
2099 * [`std::os::unix::process::CommandExt::before_exec`]
2100 * [`std::rc::Rc::strong_count`]
2101 * [`std::rc::Rc::weak_count`]
2102 * [`std::sync::Arc::strong_count`]
2103 * [`std::sync::Arc::weak_count`]
2104 * [`std::char::encode_utf8`]
2105 * [`std::char::encode_utf16`]
2106 * [`std::cell::Ref::clone`]
2107 * [`std::io::Take::into_inner`]
2112 * [The standard sorting algorithm has been rewritten for dramatic performance
2113 improvements][38192]. It is a hybrid merge sort, drawing influences from
2114 Timsort. Previously it was a naive merge sort.
2115 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2116 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2118 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2119 and `char_indices().last()`][37882]
2120 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2121 * [Chinese characters display correctly in `fmt::Debug`][37855]
2122 * [Derive `Default` for `Duration`][37699]
2123 * [Support creation of anonymous pipes on WinXP/2k][37677]
2124 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2125 * [Don't pass overlapped handles to processes][38835]
2130 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2131 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2132 should instead check the variable at runtime with `std::env`. That the value
2133 was set at build time was a bug, and incorrect when cross-compiling. This
2134 change is known to cause breakage.
2135 * [Add `--all` flag to `cargo test`][cargo/3221]
2136 * [Compile statically against the MSVC CRT][cargo/3363]
2137 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2138 * [Link OpenSSL statically on OSX][cargo/3311]
2139 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2140 * [Test for bad path overrides with summaries][cargo/3336]
2141 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2142 * [Fix retrying crate downloads for network errors][cargo/3348]
2143 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2144 * [Emit more info on --message-format=json][cargo/3319]
2145 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2146 * [Don't ignore errors in workspace manifest][cargo/3409]
2147 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2152 * [Test runners (binaries built with `--test`) now support a `--list` argument
2153 that lists the tests it contains][38185]
2154 * [Test runners now support a `--exact` argument that makes the test filter
2155 match exactly, instead of matching only a substring of the test name][38181]
2156 * [rustdoc supports a `--playground-url` flag][37763]
2157 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2162 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2163 continue to be used in this release by passing `--disable-rustbuild` to the
2164 configure script, but they will be deleted soon. Note that the new build
2165 system uses a different on-disk layout that will likely affect any scripts
2167 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2169 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2170 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2176 * [A number of minor changes to name resolution have been activated][37127].
2177 They add up to more consistent semantics, allowing for future evolution of
2178 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2179 details of what is different. The breaking changes here have been transitioned
2180 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2181 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2182 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2183 should instead check the variable at runtime with `std::env`. That the value
2184 was set at build time was a bug, and incorrect when cross-compiling. This
2185 change is known to cause breakage.
2186 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2187 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2188 1.10 and is now an error by default. It will become a hard error in the near
2190 * [The semantics relating modules to file system directories are changing in
2191 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2192 lint, which is a warning in this release, and will become a hard error in the
2194 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2195 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2196 the underlying iterator][37834]
2198 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2199 [33685]: https://github.com/rust-lang/rust/issues/33685
2200 [36868]: https://github.com/rust-lang/rust/pull/36868
2201 [37127]: https://github.com/rust-lang/rust/pull/37127
2202 [37229]: https://github.com/rust-lang/rust/pull/37229
2203 [37456]: https://github.com/rust-lang/rust/pull/37456
2204 [37527]: https://github.com/rust-lang/rust/pull/37527
2205 [37602]: https://github.com/rust-lang/rust/pull/37602
2206 [37613]: https://github.com/rust-lang/rust/pull/37613
2207 [37615]: https://github.com/rust-lang/rust/pull/37615
2208 [37636]: https://github.com/rust-lang/rust/pull/37636
2209 [37627]: https://github.com/rust-lang/rust/pull/37627
2210 [37642]: https://github.com/rust-lang/rust/pull/37642
2211 [37677]: https://github.com/rust-lang/rust/pull/37677
2212 [37699]: https://github.com/rust-lang/rust/pull/37699
2213 [37701]: https://github.com/rust-lang/rust/pull/37701
2214 [37705]: https://github.com/rust-lang/rust/pull/37705
2215 [37749]: https://github.com/rust-lang/rust/pull/37749
2216 [37760]: https://github.com/rust-lang/rust/pull/37760
2217 [37763]: https://github.com/rust-lang/rust/pull/37763
2218 [37764]: https://github.com/rust-lang/rust/pull/37764
2219 [37789]: https://github.com/rust-lang/rust/pull/37789
2220 [37791]: https://github.com/rust-lang/rust/pull/37791
2221 [37814]: https://github.com/rust-lang/rust/pull/37814
2222 [37817]: https://github.com/rust-lang/rust/pull/37817
2223 [37834]: https://github.com/rust-lang/rust/pull/37834
2224 [37848]: https://github.com/rust-lang/rust/pull/37848
2225 [37855]: https://github.com/rust-lang/rust/pull/37855
2226 [37882]: https://github.com/rust-lang/rust/pull/37882
2227 [37888]: https://github.com/rust-lang/rust/pull/37888
2228 [37973]: https://github.com/rust-lang/rust/pull/37973
2229 [37979]: https://github.com/rust-lang/rust/pull/37979
2230 [38086]: https://github.com/rust-lang/rust/pull/38086
2231 [38107]: https://github.com/rust-lang/rust/pull/38107
2232 [38117]: https://github.com/rust-lang/rust/pull/38117
2233 [38134]: https://github.com/rust-lang/rust/pull/38134
2234 [38146]: https://github.com/rust-lang/rust/pull/38146
2235 [38181]: https://github.com/rust-lang/rust/pull/38181
2236 [38182]: https://github.com/rust-lang/rust/pull/38182
2237 [38185]: https://github.com/rust-lang/rust/pull/38185
2238 [38192]: https://github.com/rust-lang/rust/pull/38192
2239 [38279]: https://github.com/rust-lang/rust/pull/38279
2240 [38835]: https://github.com/rust-lang/rust/pull/38835
2241 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2242 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2243 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2244 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2245 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2246 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2247 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2248 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2249 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2250 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2251 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2252 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2253 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2254 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2255 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2256 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2257 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2258 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2259 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2260 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2261 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2262 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2263 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2264 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2265 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2266 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2267 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2268 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2269 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2270 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2271 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2272 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2273 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2274 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2275 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2276 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2277 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2278 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2281 Version 1.14.0 (2016-12-22)
2282 ===========================
2287 * [`..` matches multiple tuple fields in enum variants, structs
2288 and tuples][36843]. [RFC 1492].
2289 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2290 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2291 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2292 dereferencing][36822]
2297 * [Mark enums with non-zero discriminant as non-zero][37224]
2298 * [Lower-case `static mut` names are linted like other
2299 statics and consts][37162]
2300 * [Fix ICE on some macros in const integer positions
2301 (e.g. `[u8; m!()]`)][36819]
2302 * [Improve error message and snippet for "did you mean `x`"][36798]
2303 * [Add a panic-strategy field to the target specification][36794]
2304 * [Include LLVM version in `--version --verbose`][37200]
2306 Compile-time Optimizations
2307 --------------------------
2309 * [Improve macro expansion performance][37569]
2310 * [Shrink `Expr_::ExprInlineAsm`][37445]
2311 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2312 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2313 * [Avoid more allocations when compiling html5ever][37373]
2314 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2315 * [Avoid some allocations in the macro parser][37318]
2316 * [Use a faster deflate setting][37298]
2317 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2318 during interning of slices][37270]
2319 * [Optimize `write_metadata`][37267]
2320 * [Don't process obligation forest cycles when stalled][37231]
2321 * [Avoid many `CrateConfig` clones][37161]
2322 * [Optimize `Substs::super_fold_with`][37108]
2323 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2324 * [Speed up `plug_leaks`][36917]
2329 * [`println!()`, with no arguments, prints newline][36825].
2330 Previously, an empty string was required to achieve the same.
2331 * [`Wrapping` impls standard binary and unary operators, as well as
2332 the `Sum` and `Product` iterators][37356]
2333 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2335 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2336 `VecDeque` iterators][37315]
2337 * [Improve `SipHasher` performance on small values][37312]
2338 * [Add Iterator trait TrustedLen to enable better FromIterator /
2340 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2341 * [`ReadDir` implements `Debug`][37221]
2342 * [Implement `RefUnwindSafe` for atomic types][37178]
2343 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2344 * [Avoid allocations in `Decoder::read_str`][37064]
2345 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2346 * [Impl `Debug` for raw pointers to unsized data][36880]
2347 * [Don't reuse `HashMap` random seeds][37470]
2348 * [The internal memory layout of `HashMap` is more cache-friendly, for
2349 significant improvements in some operations][36692]
2350 * [`HashMap` uses less memory on 32-bit architectures][36595]
2351 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2356 * [Expose rustc cfg values to build scripts][cargo/3243]
2357 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2358 * [Fix passing --features when testing multiple packages][cargo/3280]
2359 * [Use a single profile set per workspace][cargo/3249]
2360 * [Load `replace` sections from lock files][cargo/3220]
2361 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2366 * [rustup is the recommended Rust installation method][1.14rustup]
2367 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2368 S390x. These are [tier 2] platforms and may have major defects. Follow the
2369 instructions on the website to install, or add the targets to an existing
2370 installation with `rustup target add`. The new target triples are:
2371 - `mips-unknown-linux-gnu`
2372 - `mipsel-unknown-linux-gnu`
2373 - `mips64-unknown-linux-gnuabi64`
2374 - `mips64el-unknown-linux-gnuabi64 `
2375 - `powerpc-unknown-linux-gnu`
2376 - `powerpc64-unknown-linux-gnu`
2377 - `powerpc64le-unknown-linux-gnu`
2378 - `s390x-unknown-linux-gnu `
2379 * This release includes target (std) builds for ARM Linux running MUSL
2380 libc. These are [tier 2] platforms and may have major defects. Add the
2381 following triples to an existing rustup installation with `rustup target add`:
2382 - `arm-unknown-linux-musleabi`
2383 - `arm-unknown-linux-musleabihf`
2384 - `armv7-unknown-linux-musleabihf`
2385 * This release includes [experimental support for WebAssembly][1.14wasm], via
2386 the `wasm32-unknown-emscripten` target. This target is known to have major
2387 defects. Please test, report, and fix.
2388 * rustup no longer installs documentation by default. Run `rustup
2389 component add rust-docs` to install.
2390 * [Fix line stepping in debugger][37310]
2391 * [Enable line number debuginfo in releases][37280]
2396 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2397 * [Add support for Fuchsia OS][37313]
2398 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2403 * [A number of forward-compatibility lints used by the compiler
2404 to gradually introduce language changes have been converted
2405 to deny by default][36894]:
2406 - ["use of inaccessible extern crate erroneously allowed"][36886]
2407 - ["type parameter default erroneously allowed in invalid location"][36887]
2408 - ["detects super or self keywords at the beginning of global path"][36888]
2409 - ["two overlapping inherent impls define an item with the same name
2410 were erroneously allowed"][36889]
2411 - ["floating-point constants cannot be used in patterns"][36890]
2412 - ["constants of struct or enum type can only be used in a pattern if
2413 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2414 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2415 * [Prohibit patterns in trait methods without bodies][37378]
2416 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2417 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2418 * [The `$crate` macro variable is accepted in fewer locations][37213]
2419 * [Impls specifying extra region requirements beyond the trait
2420 they implement are rejected][37167]
2421 * [Enums may not be unsized][37111]. Unsized enums are intended to
2422 work but never have. For now they are forbidden.
2423 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2425 [tier 2]: https://forge.rust-lang.org/platform-support.html
2426 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2427 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2428 [36430]: https://github.com/rust-lang/rust/pull/36430
2429 [36595]: https://github.com/rust-lang/rust/pull/36595
2430 [36595]: https://github.com/rust-lang/rust/pull/36595
2431 [36692]: https://github.com/rust-lang/rust/pull/36692
2432 [36767]: https://github.com/rust-lang/rust/pull/36767
2433 [36794]: https://github.com/rust-lang/rust/pull/36794
2434 [36798]: https://github.com/rust-lang/rust/pull/36798
2435 [36819]: https://github.com/rust-lang/rust/pull/36819
2436 [36822]: https://github.com/rust-lang/rust/pull/36822
2437 [36825]: https://github.com/rust-lang/rust/pull/36825
2438 [36843]: https://github.com/rust-lang/rust/pull/36843
2439 [36880]: https://github.com/rust-lang/rust/pull/36880
2440 [36886]: https://github.com/rust-lang/rust/issues/36886
2441 [36887]: https://github.com/rust-lang/rust/issues/36887
2442 [36888]: https://github.com/rust-lang/rust/issues/36888
2443 [36889]: https://github.com/rust-lang/rust/issues/36889
2444 [36890]: https://github.com/rust-lang/rust/issues/36890
2445 [36891]: https://github.com/rust-lang/rust/issues/36891
2446 [36892]: https://github.com/rust-lang/rust/issues/36892
2447 [36894]: https://github.com/rust-lang/rust/pull/36894
2448 [36917]: https://github.com/rust-lang/rust/pull/36917
2449 [36993]: https://github.com/rust-lang/rust/pull/36993
2450 [37037]: https://github.com/rust-lang/rust/pull/37037
2451 [37064]: https://github.com/rust-lang/rust/pull/37064
2452 [37094]: https://github.com/rust-lang/rust/pull/37094
2453 [37108]: https://github.com/rust-lang/rust/pull/37108
2454 [37111]: https://github.com/rust-lang/rust/pull/37111
2455 [37161]: https://github.com/rust-lang/rust/pull/37161
2456 [37162]: https://github.com/rust-lang/rust/pull/37162
2457 [37167]: https://github.com/rust-lang/rust/pull/37167
2458 [37178]: https://github.com/rust-lang/rust/pull/37178
2459 [37200]: https://github.com/rust-lang/rust/pull/37200
2460 [37213]: https://github.com/rust-lang/rust/pull/37213
2461 [37221]: https://github.com/rust-lang/rust/pull/37221
2462 [37224]: https://github.com/rust-lang/rust/pull/37224
2463 [37230]: https://github.com/rust-lang/rust/pull/37230
2464 [37231]: https://github.com/rust-lang/rust/pull/37231
2465 [37247]: https://github.com/rust-lang/rust/pull/37247
2466 [37267]: https://github.com/rust-lang/rust/pull/37267
2467 [37270]: https://github.com/rust-lang/rust/pull/37270
2468 [37273]: https://github.com/rust-lang/rust/pull/37273
2469 [37280]: https://github.com/rust-lang/rust/pull/37280
2470 [37298]: https://github.com/rust-lang/rust/pull/37298
2471 [37306]: https://github.com/rust-lang/rust/pull/37306
2472 [37310]: https://github.com/rust-lang/rust/pull/37310
2473 [37312]: https://github.com/rust-lang/rust/pull/37312
2474 [37313]: https://github.com/rust-lang/rust/pull/37313
2475 [37315]: https://github.com/rust-lang/rust/pull/37315
2476 [37318]: https://github.com/rust-lang/rust/pull/37318
2477 [37322]: https://github.com/rust-lang/rust/pull/37322
2478 [37326]: https://github.com/rust-lang/rust/pull/37326
2479 [37351]: https://github.com/rust-lang/rust/pull/37351
2480 [37356]: https://github.com/rust-lang/rust/pull/37356
2481 [37367]: https://github.com/rust-lang/rust/pull/37367
2482 [37373]: https://github.com/rust-lang/rust/pull/37373
2483 [37378]: https://github.com/rust-lang/rust/pull/37378
2484 [37389]: https://github.com/rust-lang/rust/pull/37389
2485 [37392]: https://github.com/rust-lang/rust/pull/37392
2486 [37427]: https://github.com/rust-lang/rust/pull/37427
2487 [37439]: https://github.com/rust-lang/rust/pull/37439
2488 [37445]: https://github.com/rust-lang/rust/pull/37445
2489 [37470]: https://github.com/rust-lang/rust/pull/37470
2490 [37569]: https://github.com/rust-lang/rust/pull/37569
2491 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2492 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2493 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2494 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2495 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2496 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2497 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2500 Version 1.13.0 (2016-11-10)
2501 ===========================
2506 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2507 errors, like the `try!` macro, described in [RFC 0243].
2508 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2509 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2510 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2511 * [Fix lifetime rules for 'if' conditions][36029]
2512 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2517 * [Add the `-C link-arg` argument][36574]
2518 * [Remove the old AST-based backend from rustc_trans][35764]
2519 * [Don't enable NEON by default on armv7 Linux][35814]
2520 * [Fix debug line number info for macro expansions][35238]
2521 * [Do not emit "class method" debuginfo for types that are not
2522 DICompositeType][36008]
2523 * [Warn about multiple conflicting #[repr] hints][34623]
2524 * [When sizing DST, don't double-count nested struct prefixes][36351]
2525 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2526 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2527 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2528 * [Expand macros without recursing to avoid stack overflows][36214]
2533 * [Replace macro backtraces with labeled local uses][35702]
2534 * [Improve error message for misplaced doc comments][33922]
2535 * [Buffer unix and lock windows to prevent message interleaving][35975]
2536 * [Update lifetime errors to specifically note temporaries][36171]
2537 * [Special case a few colors for Windows][36178]
2538 * [Suggest `use self` when such an import resolves][36289]
2539 * [Be more specific when type parameter shadows primitive type][36338]
2540 * Many minor improvements
2542 Compile-time Optimizations
2543 --------------------------
2545 * [Compute and cache HIR hashes at beginning][35854]
2546 * [Don't hash types in loan paths][36004]
2547 * [Cache projections in trans][35761]
2548 * [Optimize the parser's last token handling][36527]
2549 * [Only instantiate #[inline] functions in codegen units referencing
2550 them][36524]. This leads to big improvements in cases where crates export
2551 define many inline functions without using them directly.
2552 * [Lazily allocate TypedArena's first chunk][36592]
2553 * [Don't allocate during default HashSet creation][36734]
2560 * [`overflowing_abs`]
2561 * [`RefCell::try_borrow`]
2562 * [`RefCell::try_borrow_mut`]
2567 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2568 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2570 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2571 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2572 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2573 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2574 * [Use arc4rand on FreeBSD][35884]
2575 * [memrchr: Correct aligned offset computation][35969]
2576 * [Improve Demangling of Rust Symbols][36059]
2577 * [Use monotonic time in condition variables][35048]
2578 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2579 * [Implement conversion traits for `char`][35755]
2580 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2581 * [Zero first byte of CString on drop][36264]
2582 * [Inherit overflow checks for sum and product][36372]
2583 * [Add missing Eq implementations][36423]
2584 * [Implement `Debug` for `DirEntry`][36631]
2585 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2587 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2588 * [Implement more traits for `std::io::ErrorKind`][35911]
2589 * [Optimize BinaryHeap bounds checking][36072]
2590 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2591 `extend_with_element`][36355]
2592 * [Fix overflow checking in unsigned pow()][34942]
2597 * This release includes security fixes to both curl and OpenSSL.
2598 * [Fix transitive doctests when panic=abort][cargo/3021]
2599 * [Add --all-features flag to cargo][cargo/3038]
2600 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2601 * [Don't parse the home directory more than once][cargo/3078]
2602 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2603 * [Update OpenSSL to 1.0.2j][cargo/3121]
2604 * [Add license and license_file to cargo metadata output][cargo/3110]
2605 * [Make crates-io registry URL optional in config; ignore all changes to
2606 source.crates-io][cargo/3089]
2607 * [Don't download dependencies from other platforms][cargo/3123]
2608 * [Build transitive dev-dependencies when needed][cargo/3125]
2609 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2610 * [Avoid updating registry when adding existing deps][cargo/3144]
2611 * [Warn about path overrides that won't work][cargo/3136]
2612 * [Use workspaces during `cargo install`][cargo/3146]
2613 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2614 * [Add --message-format flag][cargo/3000]
2615 * [Pass target environment for rustdoc][cargo/3205]
2616 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2617 * [Update curl and curl-sys][cargo/3241]
2618 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2623 * [rustdoc: Add the `--sysroot` argument][36586]
2624 * [rustdoc: Fix a couple of issues with the search results][35655]
2625 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2626 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2627 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2632 * [Remove unmaintained style guide][35124]
2633 * [Add s390x support][36369]
2634 * [Initial work at Haiku OS support][36727]
2635 * [Add mips-uclibc targets][35734]
2636 * [Crate-ify compiler-rt into compiler-builtins][35021]
2637 * [Add rustc version info (git hash + date) to dist tarball][36213]
2638 * Many documentation improvements
2643 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2644 * [Deny (by default) transmuting from fn item types to pointer-sized
2645 types][34923]. Continuing the long transition to zero-sized fn items,
2647 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2649 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2650 * [Fix lifetime rules for 'if' conditions][36029].
2651 * [Inherit overflow checks for sum and product][36372].
2652 * [Forbid user-defined macros named "macro_rules"][36730].
2654 [33922]: https://github.com/rust-lang/rust/pull/33922
2655 [34623]: https://github.com/rust-lang/rust/pull/34623
2656 [34923]: https://github.com/rust-lang/rust/pull/34923
2657 [34942]: https://github.com/rust-lang/rust/pull/34942
2658 [34982]: https://github.com/rust-lang/rust/pull/34982
2659 [35021]: https://github.com/rust-lang/rust/pull/35021
2660 [35048]: https://github.com/rust-lang/rust/pull/35048
2661 [35074]: https://github.com/rust-lang/rust/pull/35074
2662 [35124]: https://github.com/rust-lang/rust/pull/35124
2663 [35234]: https://github.com/rust-lang/rust/pull/35234
2664 [35238]: https://github.com/rust-lang/rust/pull/35238
2665 [35354]: https://github.com/rust-lang/rust/pull/35354
2666 [35559]: https://github.com/rust-lang/rust/pull/35559
2667 [35585]: https://github.com/rust-lang/rust/pull/35585
2668 [35627]: https://github.com/rust-lang/rust/pull/35627
2669 [35655]: https://github.com/rust-lang/rust/pull/35655
2670 [35702]: https://github.com/rust-lang/rust/pull/35702
2671 [35707]: https://github.com/rust-lang/rust/pull/35707
2672 [35728]: https://github.com/rust-lang/rust/pull/35728
2673 [35734]: https://github.com/rust-lang/rust/pull/35734
2674 [35755]: https://github.com/rust-lang/rust/pull/35755
2675 [35761]: https://github.com/rust-lang/rust/pull/35761
2676 [35764]: https://github.com/rust-lang/rust/pull/35764
2677 [35814]: https://github.com/rust-lang/rust/pull/35814
2678 [35854]: https://github.com/rust-lang/rust/pull/35854
2679 [35871]: https://github.com/rust-lang/rust/pull/35871
2680 [35884]: https://github.com/rust-lang/rust/pull/35884
2681 [35911]: https://github.com/rust-lang/rust/pull/35911
2682 [35969]: https://github.com/rust-lang/rust/pull/35969
2683 [35975]: https://github.com/rust-lang/rust/pull/35975
2684 [36004]: https://github.com/rust-lang/rust/pull/36004
2685 [36008]: https://github.com/rust-lang/rust/pull/36008
2686 [36014]: https://github.com/rust-lang/rust/pull/36014
2687 [36029]: https://github.com/rust-lang/rust/pull/36029
2688 [36059]: https://github.com/rust-lang/rust/pull/36059
2689 [36072]: https://github.com/rust-lang/rust/pull/36072
2690 [36101]: https://github.com/rust-lang/rust/pull/36101
2691 [36104]: https://github.com/rust-lang/rust/pull/36104
2692 [36171]: https://github.com/rust-lang/rust/pull/36171
2693 [36173]: https://github.com/rust-lang/rust/pull/36173
2694 [36178]: https://github.com/rust-lang/rust/pull/36178
2695 [36213]: https://github.com/rust-lang/rust/pull/36213
2696 [36214]: https://github.com/rust-lang/rust/pull/36214
2697 [36264]: https://github.com/rust-lang/rust/pull/36264
2698 [36266]: https://github.com/rust-lang/rust/pull/36266
2699 [36289]: https://github.com/rust-lang/rust/pull/36289
2700 [36338]: https://github.com/rust-lang/rust/pull/36338
2701 [36351]: https://github.com/rust-lang/rust/pull/36351
2702 [36355]: https://github.com/rust-lang/rust/pull/36355
2703 [36369]: https://github.com/rust-lang/rust/pull/36369
2704 [36372]: https://github.com/rust-lang/rust/pull/36372
2705 [36423]: https://github.com/rust-lang/rust/pull/36423
2706 [36482]: https://github.com/rust-lang/rust/pull/36482
2707 [36505]: https://github.com/rust-lang/rust/pull/36505
2708 [36524]: https://github.com/rust-lang/rust/pull/36524
2709 [36527]: https://github.com/rust-lang/rust/pull/36527
2710 [36551]: https://github.com/rust-lang/rust/pull/36551
2711 [36574]: https://github.com/rust-lang/rust/pull/36574
2712 [36586]: https://github.com/rust-lang/rust/pull/36586
2713 [36592]: https://github.com/rust-lang/rust/pull/36592
2714 [36631]: https://github.com/rust-lang/rust/pull/36631
2715 [36639]: https://github.com/rust-lang/rust/pull/36639
2716 [36721]: https://github.com/rust-lang/rust/pull/36721
2717 [36727]: https://github.com/rust-lang/rust/pull/36727
2718 [36730]: https://github.com/rust-lang/rust/pull/36730
2719 [36734]: https://github.com/rust-lang/rust/pull/36734
2720 [36754]: https://github.com/rust-lang/rust/pull/36754
2721 [36995]: https://github.com/rust-lang/rust/pull/36995
2722 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2723 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2724 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2725 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2726 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2727 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2728 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2729 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2730 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2731 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2732 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2733 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2734 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2735 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2736 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2737 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2738 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2739 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2740 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2741 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2742 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2743 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2744 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
2745 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
2746 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
2747 [rustup]: https://www.rustup.rs
2748 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
2749 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
2750 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
2751 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
2752 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
2753 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
2754 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
2757 Version 1.12.1 (2016-10-20)
2758 ===========================
2763 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
2764 * [Confusion with double negation and booleans][36856]
2765 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
2766 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
2767 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
2768 * [Corrupted memory after updated to 1.12][36936]
2769 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
2770 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
2771 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
2773 [36381]: https://github.com/rust-lang/rust/issues/36381
2774 [36856]: https://github.com/rust-lang/rust/issues/36856
2775 [36875]: https://github.com/rust-lang/rust/issues/36875
2776 [36924]: https://github.com/rust-lang/rust/issues/36924
2777 [36926]: https://github.com/rust-lang/rust/issues/36926
2778 [36936]: https://github.com/rust-lang/rust/issues/36936
2779 [37026]: https://github.com/rust-lang/rust/issues/37026
2780 [37112]: https://github.com/rust-lang/rust/issues/37112
2781 [37153]: https://github.com/rust-lang/rust/issues/37153
2784 Version 1.12.0 (2016-09-29)
2785 ===========================
2790 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2791 This translation pass is far simpler than the previous AST->LLVM pass, and
2792 creates opportunities to perform new optimizations directly on the MIR. It
2793 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2794 * [`rustc` presents a new, more readable error format, along with
2795 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2796 Most common editors supporting Rust have been updated to work with it. It was
2797 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2802 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2803 This translation pass is far simpler than the previous AST->LLVM pass, and
2804 creates opportunities to perform new optimizations directly on the MIR. It
2805 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2806 * [Print the Rust target name, not the LLVM target name, with
2807 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2808 * [The computation of `TypeId` is correct in some cases where it was previously
2809 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2810 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2811 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2812 `--print relocation-models`, and `--print code-models` print the available
2813 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2814 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2815 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2816 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2817 These targets produce statically-linked binaries. There are no binary release
2823 * [`rustc` presents a new, more readable error format, along with
2824 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2825 Most common editors supporting Rust have been updated to work with it. It was
2826 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2827 * [In error descriptions, references are now described in plain English,
2828 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2829 * [In error type descriptions, unknown numeric types are named `{integer}` or
2830 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2831 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2836 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2837 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2838 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2839 useful](https://github.com/rust-lang/rust/pull/34908)
2840 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2841 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2842 * [Semicolons are properly required as statement delimiters inside
2843 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2844 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2849 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2850 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2851 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2852 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2853 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2854 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2855 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2856 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2857 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2858 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2859 Both on Unix and Windows.
2860 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2861 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2862 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2863 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2864 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2865 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2866 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2867 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2872 * [The `format!` macro and friends now allow a single argument to be formatted
2873 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2874 * [The lifetime bounds on `[T]::binary_search_by` and
2875 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2876 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2877 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2878 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2879 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2880 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2881 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2882 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2883 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2884 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2885 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2886 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2887 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2888 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2889 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2890 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2891 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2892 * [`mpsc::sync_channel` `Receiver`s return any available message before
2893 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2894 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2895 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2900 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2901 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2902 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2903 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2904 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2905 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2906 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2907 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2908 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2909 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2910 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2911 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2912 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2913 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2914 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2915 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2920 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2921 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2926 * [Test binaries now support a `--test-threads` argument to specify the number
2927 of threads used to run tests, and which acts the same as the
2928 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2929 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2930 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2931 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2932 * [Rust releases now come with source packages that can be installed by rustup
2933 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2934 The resulting source code can be used by tools and IDES, located in the
2935 sysroot under `lib/rustlib/src`.
2940 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2941 * Many minor improvements to the documentation.
2942 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2947 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2948 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2949 * [When formatting strings, if "precision" is specified, the "fill",
2950 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2951 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2954 Version 1.11.0 (2016-08-18)
2955 ===========================
2960 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2961 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2962 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2963 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2964 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2969 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2970 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2971 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2972 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2973 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2974 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2975 (in libcore - previously stabilized in libstd)
2976 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2977 (in libcore - previously stabilized in libstd)
2978 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2979 (in libcore - previously stabilized in libstd)
2980 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
2981 (in libcore - previously stabilized in libstd)
2982 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2983 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2984 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
2985 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
2990 * [The `thread_local!` macro supports multiple definitions in a single
2991 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
2992 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
2993 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
2994 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
2995 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
2996 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
2997 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
2998 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3003 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3004 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3005 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3006 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3007 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3008 and `-vv` prints warnings for all crates.
3009 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3010 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3011 This provides room for expansion by arbitrary tools.
3012 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3013 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3014 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3015 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3016 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3017 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3018 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3023 * [Caching projections speeds up type check dramatically for some
3024 workloads](https://github.com/rust-lang/rust/pull/33816)
3025 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3026 This hasher is faster, but is believed to provide sufficient
3027 protection from collision attacks.
3028 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3033 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3034 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3035 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3036 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3037 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3042 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3043 * [When emitting debug info, rustc emits frame pointers for closures,
3044 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3045 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3046 * Many more errors have been given error codes and extended
3048 * API documentation continues to be improved, with many new examples
3053 * [rustc no longer hangs when dependencies recursively re-export
3054 submodules](https://github.com/rust-lang/rust/pull/34542)
3055 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3056 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3057 rewritten](https://github.com/rust-lang/rust/pull/33895)
3058 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3059 No targets use this yet, but it works toward AVR support.
3064 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3065 * [The new follow-set rules that place restrictions on `macro_rules!`
3066 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3067 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3068 and has been a warning since 1.10.
3069 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3070 This causes breakage in some corner cases.
3073 Version 1.10.0 (2016-07-07)
3074 ===========================
3079 * [Allow `concat_idents!` in type positions as well as in expression
3080 positions](https://github.com/rust-lang/rust/pull/33735).
3081 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3082 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3083 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3084 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3085 * [`panic!` can be converted to a runtime abort with the
3086 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3087 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3088 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3089 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3090 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3091 Note that Cargo does not yet directly support cdylibs.
3096 * `os::windows::fs::OpenOptionsExt::access_mode`
3097 * `os::windows::fs::OpenOptionsExt::share_mode`
3098 * `os::windows::fs::OpenOptionsExt::custom_flags`
3099 * `os::windows::fs::OpenOptionsExt::attributes`
3100 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3101 * `os::unix::fs::OpenOptionsExt::custom_flags`
3102 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3103 * `Default for sync::Weak`
3104 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3105 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3106 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3107 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3108 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3109 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3110 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3111 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3112 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3113 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3114 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3115 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3116 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3117 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3118 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3119 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3120 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3121 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3122 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3123 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3124 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3125 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3126 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3127 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3128 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3129 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3130 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3131 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3132 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3133 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3134 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3135 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3136 * Read/Write/RawFd impls for `UnixStream`
3137 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3138 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3139 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3140 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3141 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3142 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3143 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3144 * RawFd impls for `UnixListener`
3145 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3146 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3147 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3148 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3149 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3150 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3151 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3152 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3153 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3154 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3155 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3156 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3157 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3158 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3159 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3160 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3161 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3162 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3163 * RawFd impls for `UnixDatagram`
3164 * `{BTree,Hash}Map::values_mut`
3165 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
3170 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3171 The semantics of this minor method are subtle and probably not what
3173 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3174 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3175 will fall back to `/dev/urandom` temporarily to avoid blocking
3176 during early boot](https://github.com/rust-lang/rust/pull/33086).
3177 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3178 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3179 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3180 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3181 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3182 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3183 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3187 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3188 This controls the runtime behavior of the `panic!` macro
3189 and can be either "unwind" (the default), or "abort".
3190 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3191 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3192 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3193 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3194 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3195 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3196 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3197 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3198 By default they are retried twice, which can be customized with the
3199 `net.retry` value in `.cargo/config`.
3200 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3201 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3202 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3203 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3204 Makes it possible to install multiple crates in parallel.
3205 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3206 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3207 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3208 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3209 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3210 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3215 * [rustc memory usage was reduced by refactoring the context used for
3216 type checking](https://github.com/rust-lang/rust/pull/33425).
3217 * [Speed up creation of `HashMap`s by caching the random keys used
3218 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3219 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3220 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3221 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3222 10x faster than the previous lookup tables.
3223 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3228 * Many incremental improvements to documentation and rustdoc.
3229 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3230 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3231 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3232 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3233 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3234 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3235 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3240 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3241 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3242 * [`std` no longer prints backtraces on platforms where the running
3243 module must be loaded with `env::current_exe`, which can't be relied
3244 on](https://github.com/rust-lang/rust/pull/33554).
3245 * This release includes std binaries for the i586-unknown-linux-gnu,
3246 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3247 i586 target is for old x86 hardware without SSE2, and the armv7
3248 target is for Android running on modern ARM architectures.
3249 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3250 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3251 * [On Unix the runtime aborts by calling `libc::abort` instead of
3252 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3253 * [Rust is now bootstrapped from the previous release of Rust,
3254 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3259 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3260 * [`target_env` for Linux ARM targets is just `gnu`, not
3261 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3262 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3263 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3264 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3265 Affects how macros are parsed.
3266 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3267 * [Feature-gated attributes on macro-generated macro invocations are
3268 now rejected](https://github.com/rust-lang/rust/pull/32791).
3269 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3270 This caused some minor changes to type inference.
3273 Version 1.9.0 (2016-05-26)
3274 ==========================
3279 * The `#[deprecated]` attribute when applied to an API will generate
3280 warnings when used. The warnings may be suppressed with
3281 `#[allow(deprecated)]`. [RFC 1270].
3282 * [`fn` item types are zero sized, and each `fn` names a unique
3283 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3284 `transmute` on a `fn` type will generate a warning for a few cycles,
3285 then will be converted to an error.
3286 * [Field and method resolution understand visibility, so private
3287 fields and methods cannot prevent the proper use of public fields
3288 and methods][1.9fv].
3289 * [The parser considers unicode codepoints in the
3290 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3296 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3297 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3298 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3299 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3300 * [`str::is_char_boundary`]
3301 * [`<*const T>::as_ref`]
3302 * [`<*mut T>::as_ref`]
3303 * [`<*mut T>::as_mut`]
3304 * [`AsciiExt::make_ascii_uppercase`]
3305 * [`AsciiExt::make_ascii_lowercase`]
3306 * [`char::decode_utf16`]
3307 * [`char::DecodeUtf16`]
3308 * [`char::DecodeUtf16Error`]
3309 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3310 * [`BTreeSet::take`]
3311 * [`BTreeSet::replace`]
3314 * [`HashSet::replace`]
3316 * [`OsString::with_capacity`]
3317 * [`OsString::clear`]
3318 * [`OsString::capacity`]
3319 * [`OsString::reserve`]
3320 * [`OsString::reserve_exact`]
3321 * [`OsStr::is_empty`]
3323 * [`std::os::unix::thread`]
3326 * [`JoinHandleExt::as_pthread_t`]
3327 * [`JoinHandleExt::into_pthread_t`]
3328 * [`HashSet::hasher`]
3329 * [`HashMap::hasher`]
3330 * [`CommandExt::exec`]
3331 * [`File::try_clone`]
3332 * [`SocketAddr::set_ip`]
3333 * [`SocketAddr::set_port`]
3334 * [`SocketAddrV4::set_ip`]
3335 * [`SocketAddrV4::set_port`]
3336 * [`SocketAddrV6::set_ip`]
3337 * [`SocketAddrV6::set_port`]
3338 * [`SocketAddrV6::set_flowinfo`]
3339 * [`SocketAddrV6::set_scope_id`]
3340 * [`slice::copy_from_slice`]
3341 * [`ptr::read_volatile`]
3342 * [`ptr::write_volatile`]
3343 * [`OpenOptions::create_new`]
3344 * [`TcpStream::set_nodelay`]
3345 * [`TcpStream::nodelay`]
3346 * [`TcpStream::set_ttl`]
3347 * [`TcpStream::ttl`]
3348 * [`TcpStream::set_only_v6`]
3349 * [`TcpStream::only_v6`]
3350 * [`TcpStream::take_error`]
3351 * [`TcpStream::set_nonblocking`]
3352 * [`TcpListener::set_ttl`]
3353 * [`TcpListener::ttl`]
3354 * [`TcpListener::set_only_v6`]
3355 * [`TcpListener::only_v6`]
3356 * [`TcpListener::take_error`]
3357 * [`TcpListener::set_nonblocking`]
3358 * [`UdpSocket::set_broadcast`]
3359 * [`UdpSocket::broadcast`]
3360 * [`UdpSocket::set_multicast_loop_v4`]
3361 * [`UdpSocket::multicast_loop_v4`]
3362 * [`UdpSocket::set_multicast_ttl_v4`]
3363 * [`UdpSocket::multicast_ttl_v4`]
3364 * [`UdpSocket::set_multicast_loop_v6`]
3365 * [`UdpSocket::multicast_loop_v6`]
3366 * [`UdpSocket::set_multicast_ttl_v6`]
3367 * [`UdpSocket::multicast_ttl_v6`]
3368 * [`UdpSocket::set_ttl`]
3369 * [`UdpSocket::ttl`]
3370 * [`UdpSocket::set_only_v6`]
3371 * [`UdpSocket::only_v6`]
3372 * [`UdpSocket::join_multicast_v4`]
3373 * [`UdpSocket::join_multicast_v6`]
3374 * [`UdpSocket::leave_multicast_v4`]
3375 * [`UdpSocket::leave_multicast_v6`]
3376 * [`UdpSocket::take_error`]
3377 * [`UdpSocket::connect`]
3378 * [`UdpSocket::send`]
3379 * [`UdpSocket::recv`]
3380 * [`UdpSocket::set_nonblocking`]
3385 * [`std::sync::Once` is poisoned if its initialization function
3387 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3388 * [Most types implement `fmt::Debug`][1.9db].
3389 * [The default buffer size used by `BufReader` and `BufWriter` was
3390 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3391 used by other languages.
3392 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3393 `Duration` additionally implements `*=` and `/=`][1.9ta].
3394 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3395 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3396 * [`Chain` implements `BufRead`][1.9ch].
3397 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3402 * [Cargo can now run concurrently][1.9cc].
3403 * [Top-level overrides allow specific revisions of crates to be
3404 overridden through the entire crate graph][1.9ct]. This is intended
3405 to make upgrades easier for large projects, by allowing crates to be
3406 forked temporarily until they've been upgraded and republished.
3407 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3408 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3409 on the commandline][1.9cf]. `rustc` arguments can also be specified
3410 in the `build.rustflags` configuration key.
3415 * [The time complexity of comparing variables for equivalence during type
3416 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3417 to major compilation time improvement in some scenarios.
3418 * [`ToString` is specialized for `str`, giving it the same performance
3419 as `to_owned`][1.9ts].
3420 * [Spawning processes with `Command::output` no longer creates extra
3422 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3423 for C-like enums][1.9cl].
3428 * [Passing the `--quiet` flag to a test runner will produce
3429 much-abbreviated output][1.9q].
3430 * The Rust Project now publishes std binaries for the
3431 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3432 `i586-pc-windows-msvc` targets.
3437 * [`std::sync::Once` is poisoned if its initialization function
3439 * [It is illegal to define methods with the same name in overlapping
3440 inherent `impl` blocks][1.9sn].
3441 * [`fn` item types are zero sized, and each `fn` names a unique
3442 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3443 `transmute` on a `fn` type will generate a warning for a few cycles,
3444 then will be converted to an error.
3445 * [Improvements to const evaluation may trigger new errors when integer
3446 literals are out of range][1.9ce].
3449 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3450 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3451 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3452 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3453 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3454 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3455 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3456 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3457 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3458 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3459 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3460 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3461 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3462 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3463 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3464 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3465 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3466 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3467 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3468 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3469 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3470 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3471 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3472 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3473 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3474 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3475 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3476 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3477 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3478 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3479 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3480 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3481 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3482 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3483 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3484 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3485 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3486 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3487 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3488 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3489 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3490 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3491 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3492 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3493 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3494 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3495 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3496 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3497 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3498 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3499 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3500 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3501 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3502 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3503 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3504 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3505 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3506 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3507 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3508 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3509 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3510 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3511 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3512 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3513 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3514 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3515 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3516 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3517 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3518 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3519 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3520 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3521 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3522 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3523 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3524 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3525 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3526 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3527 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3528 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3529 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3530 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3531 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3532 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3533 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3534 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3535 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3536 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3537 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3538 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3539 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3540 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3541 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3542 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3543 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3544 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3545 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3546 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3547 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3548 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3549 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3550 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3551 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3552 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3553 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3554 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3555 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3556 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3557 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3558 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3561 Version 1.8.0 (2016-04-14)
3562 ==========================
3567 * Rust supports overloading of compound assignment statements like
3568 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3569 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3570 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3572 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3573 addition to the non-braced form, `struct Foo;`. [RFC 218].
3579 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3580 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3583 * [`ptr::drop_in_place`]
3585 * [`time::SystemTime`]
3587 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3588 * [`Instant::elapsed`]
3589 * [`SystemTime::now`]
3590 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3591 * [`SystemTime::elapsed`]
3592 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3593 * [`SystemTimeError`]
3594 * [`SystemTimeError::duration`]
3595 * Various impls for `SystemTimeError`
3597 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3598 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3599 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3600 * [The `write!` and `writeln!` macros correctly emit errors if any of
3601 their arguments can't be formatted][1.8w].
3602 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3603 * [The Unix-specific `raw` modules, which contain a number of
3604 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3605 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3606 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3607 across platforms was making it difficult to implement `std`
3608 correctly. Those that need these definitions should use the `libc`
3610 * The Unix-specific `MetadataExt` traits, including
3611 `os::unix::fs::MetadataExt`, which expose values such as inode
3612 numbers [no longer return platform-specific types][1.8r], but
3613 instead return widened integers. [RFC 1415].
3614 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3615 * [Atomic loads and stores are not volatile][1.8a].
3616 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3621 * [Inlining hash functions lead to a 3% compile-time improvement in
3622 some workloads][1.8h].
3623 * When using jemalloc, its symbols are [unprefixed so that it
3624 overrides the libc malloc implementation][1.8h]. This means that for
3625 rustc, LLVM is now using jemalloc, which results in a 6%
3626 compile-time improvement on a specific workload.
3627 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3632 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3633 i686-pc-windows-msvc is now considered a tier-1 platform.
3634 * [The `--print targets` flag prints a list of supported targets][1.8t].
3635 * [The `--print cfg` flag prints the `cfg`s defined for the current
3637 * [`rustc` can be built with an new Cargo-based build system, written
3638 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3639 build system. To enable it configure with `configure --rustbuild`.
3640 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3641 variants while also indicating the total number of missing variants
3642 if more than 3][1.8m].
3643 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3644 * The Rust Project now publishes binary releases of the standard
3645 library for a number of tier-2 targets:
3646 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3647 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3648 `x86_64-rumprun-netbsd`. These can be installed with
3649 tools such as [multirust][1.8mr].
3654 * [`cargo init` creates a new Cargo project in the current
3655 directory][1.8ci]. It is otherwise like `cargo new`.
3656 * [Cargo has configuration keys for `-v` and
3657 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3658 `[term]` section of `.cargo/config`.
3659 * [Configuration keys that evaluate to strings or integers can be set
3660 via environment variables][1.8ce]. For example the `build.jobs` key
3661 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3662 precedence over config files.
3663 * [Target-specific dependencies support Rust `cfg` syntax for
3664 describing targets][1.8cfg] so that dependencies for multiple
3665 targets can be specified together. [RFC 1361].
3666 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3667 `RUSTDOC` take precedence over the `build.target-dir`,
3668 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3669 * [The child process tree is killed on Windows when Cargo is
3671 * [The `build.target` configuration value sets the target platform,
3672 like `--target`][1.8ct].
3677 * [Unstable compiler flags have been further restricted][1.8u]. Since
3678 1.0 `-Z` flags have been considered unstable, and other flags that
3679 were considered unstable additionally required passing `-Z
3680 unstable-options` to access. Unlike unstable language and library
3681 features though, these options have been accessible on the stable
3682 release channel. Going forward, *new unstable flags will not be
3683 available on the stable release channel*, and old unstable flags
3684 will warn about their usage. In the future, all unstable flags will
3685 be unavailable on the stable release channel.
3686 * [It is no longer possible to `match` on empty enum variants using
3687 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3688 * The Unix-specific `MetadataExt` traits, including
3689 `os::unix::fs::MetadataExt`, which expose values such as inode
3690 numbers [no longer return platform-specific types][1.8r], but
3691 instead return widened integers. [RFC 1415].
3692 * [Modules sourced from the filesystem cannot appear within arbitrary
3693 blocks, but only within other modules][1.8mf].
3694 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3695 * On Unix, [stack overflow triggers a runtime abort instead of a
3697 * [`Command::spawn` and its equivalents return an error if any of
3698 its command-line arguments contain interior `NUL`s][1.8n].
3699 * [Tuple and unit enum variants from other crates are in the type
3701 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3702 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3703 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3704 instead of `foo.lib`.
3707 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3708 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3709 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3710 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3711 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3712 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3713 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3714 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3715 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3716 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3717 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3718 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3719 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3720 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3721 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3722 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3723 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3724 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3725 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3726 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3727 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3728 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3729 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3730 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3731 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3732 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3733 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3734 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3735 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3736 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3737 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3738 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3739 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3740 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3741 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3742 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3743 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3744 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
3745 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
3746 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
3747 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
3748 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
3749 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
3750 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
3751 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
3752 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
3753 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
3754 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
3755 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
3756 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
3757 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
3758 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
3759 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
3760 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
3761 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
3762 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
3763 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
3764 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
3765 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
3766 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
3769 Version 1.7.0 (2016-03-03)
3770 ==========================
3777 * [`Path::strip_prefix`][] (renamed from relative_from)
3778 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3780 * [`Ipv4Addr::is_loopback`]
3781 * [`Ipv4Addr::is_private`]
3782 * [`Ipv4Addr::is_link_local`]
3783 * [`Ipv4Addr::is_multicast`]
3784 * [`Ipv4Addr::is_broadcast`]
3785 * [`Ipv4Addr::is_documentation`]
3787 * [`Ipv6Addr::is_unspecified`]
3788 * [`Ipv6Addr::is_loopback`]
3789 * [`Ipv6Addr::is_multicast`]
3792 * [`Vec::as_mut_slice`]
3794 * [`String::as_str`]
3795 * [`String::as_mut_str`]
3797 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3799 * `<[T]>::`[`sort_by_key`]
3800 * checked, saturated, and overflowing operations
3801 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3802 * [`i32::saturating_mul`]
3803 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3804 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3805 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3806 * [`u32::saturating_mul`]
3807 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3808 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3809 * and checked, saturated, and overflowing operations for other primitive types
3811 * [`ffi::IntoStringError`]
3812 * [`CString::into_string`]
3813 * [`CString::into_bytes`]
3814 * [`CString::into_bytes_with_nul`]
3815 * `From<CString> for Vec<u8>`
3817 * [`IntoStringError::into_cstring`]
3818 * [`IntoStringError::utf8_error`]
3819 * `Error for IntoStringError`
3821 * [`std::hash::BuildHasher`]
3822 * [`BuildHasher::Hasher`]
3823 * [`BuildHasher::build_hasher`]
3824 * [`std::hash::BuildHasherDefault`]
3825 * [`HashMap::with_hasher`]
3826 * [`HashMap::with_capacity_and_hasher`]
3827 * [`HashSet::with_hasher`]
3828 * [`HashSet::with_capacity_and_hasher`]
3829 * [`std::collections::hash_map::RandomState`]
3830 * [`RandomState::new`]
3831 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3832 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3833 from bytes is faster.
3834 * [The performance of `LineWriter` (and thus `io::stdout`) was
3835 improved by using `memchr` to search for newlines][1.7m].
3836 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3837 `f64` variants were stabilized previously.
3838 * [`BTreeMap` was rewritten to use less memory and improve the performance
3839 of insertion and iteration, the latter by as much as 5x][1.7bm].
3840 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3841 covariant over their contained type][1.7bt].
3842 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3843 over their contained type][1.7ll].
3844 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3846 * [`Any` is implemented for unsized types][1.7a].
3847 * [`Hash` is implemented for `Duration`][1.7h].
3852 * [When running tests with `--test`, rustdoc will pass `--cfg`
3853 arguments to the compiler][1.7dt].
3854 * [The compiler is built with RPATH information by default][1.7rpa].
3855 This means that it will be possible to run `rustc` when installed in
3856 unusual configurations without configuring the dynamic linker search
3858 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3859 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3860 over `LD_LIBRARY_PATH`.
3865 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3866 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3867 * [The `rerun-if-changed` build script directive no longer causes the
3868 build script to incorrectly run twice in certain scenarios][1.7rr].
3873 * Soundness fixes to the interactions between associated types and
3874 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3875 code that violates the new rules. This is a significant change that
3876 is known to break existing code, so it has emitted warnings for the
3877 new error cases since 1.4 to give crate authors time to adapt. The
3878 details of what is changing are subtle; read the RFC for more.
3879 * [Several bugs in the compiler's visibility calculations were
3880 fixed][1.7v]. Since this was found to break significant amounts of
3881 code, the new errors will be emitted as warnings for several release
3882 cycles, under the `private_in_public` lint.
3883 * Defaulted type parameters were accidentally accepted in positions
3884 that were not intended. In this release, [defaulted type parameters
3885 appearing outside of type definitions will generate a
3886 warning][1.7d], which will become an error in future releases.
3887 * [Parsing "." as a float results in an error instead of 0][1.7p].
3888 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3889 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3891 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3892 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3893 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3894 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3895 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3896 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3897 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3898 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3899 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3900 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3901 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3902 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3903 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3904 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3905 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3906 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3907 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3908 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3909 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3910 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3911 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3912 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3913 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3914 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3915 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3916 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3917 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3918 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3919 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3920 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3921 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3922 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3923 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3924 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3925 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3926 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3927 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3928 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3929 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3930 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3931 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3932 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3933 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3934 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3935 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3936 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3937 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3938 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3939 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3940 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3941 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3942 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3943 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3944 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3945 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3946 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3947 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3948 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3949 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3950 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3951 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3952 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3953 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3954 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3955 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3956 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3957 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3958 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3959 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3960 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3961 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3962 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3963 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3964 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3965 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3966 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3967 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3968 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3969 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3972 Version 1.6.0 (2016-01-21)
3973 ==========================
3978 * The `#![no_std]` attribute causes a crate to not be linked to the
3979 standard library, but only the [core library][1.6co], as described
3980 in [RFC 1184]. The core library defines common types and traits but
3981 has no platform dependencies whatsoever, and is the basis for Rust
3982 software in environments that cannot support a full port of the
3983 standard library, such as operating systems. Most of the core
3984 library is now stable.
3990 [`Read::read_exact`],
3991 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
3992 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
3993 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
3994 [`os::unix::fs::DirBuilderExt`],
3995 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
3996 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
3997 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
3998 [`collections::hash_map::Drain`],
3999 [`collections::hash_map::HashMap::drain`],
4000 [`collections::hash_set::Drain`],
4001 [`collections::hash_set::HashSet::drain`],
4002 [`collections::binary_heap::Drain`],
4003 [`collections::binary_heap::BinaryHeap::drain`],
4004 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4005 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4006 [`RwLock::into_inner`],
4007 [`Iterator::min_by_key`][] (renamed from `min_by`),
4008 [`Iterator::max_by_key`][] (renamed from `max_by`).
4009 * The [core library][1.6co] is stable, as are most of its APIs.
4010 * [The `assert_eq!` macro supports arguments that don't implement
4011 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4013 * Several timer functions that take duration in milliseconds [are
4014 deprecated in favor of those that take `Duration`][1.6ms]. These
4015 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4016 `thread::park_timeout_ms`.
4017 * The algorithm by which `Vec` reserves additional elements was
4018 [tweaked to not allocate excessive space][1.6a] while still growing
4020 * `From` conversions are [implemented from integers to floats][1.6f]
4021 in cases where the conversion is lossless. Thus they are not
4022 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4023 or `f64`. They are also not implemented for `isize` and `usize`
4024 because the implementations would be platform-specific. `From` is
4025 also implemented from `f32` to `f64`.
4026 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4027 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4028 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4029 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4031 * Sorting slices that are already sorted [is 50% faster in some
4037 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4038 * Cargo build scripts can specify their dependencies by emitting the
4039 [`rerun-if-changed`][1.6rr] key.
4040 * crates.io will reject publication of crates with dependencies that
4041 have a wildcard version constraint. Crates with wildcard
4042 dependencies were seen to cause a variety of problems, as described
4043 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4045 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4046 release folder. A variety of artifacts that Cargo failed to clean
4047 are now correctly deleted.
4052 * The `unreachable_code` lint [warns when a function call's argument
4054 * The parser indicates [failures that may be caused by
4055 confusingly-similar Unicode characters][1.6uc]
4056 * Certain macro errors [are reported at definition time][1.6m], not
4062 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4063 environment variable when locating crates. This was a pre-cargo
4064 feature for integrating with the package manager that was
4065 accidentally never removed.
4066 * [A number of bugs were fixed in the privacy checker][1.6p] that
4067 could cause previously-accepted code to break.
4068 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4069 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4070 struct pattern syntax (`Foo(..)`) can no longer be used to match
4071 unit structs. This is a warning now, but will become an error in
4072 future releases. Patterns that share the same name as a const are
4074 * A bug was fixed that causes [rustc not to apply default type
4075 parameters][1.6xc] when resolving certain method implementations of
4076 traits defined in other crates.
4078 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4079 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4080 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4081 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4082 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4083 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
4084 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4085 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4086 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4087 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4088 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4089 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4090 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4091 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4092 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4093 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4094 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4095 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4096 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4097 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4098 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4099 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4100 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4101 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4102 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4103 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4104 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4105 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4106 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4107 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4108 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4109 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4110 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4111 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4112 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4113 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4114 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4115 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4116 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4117 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4118 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4119 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4120 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4121 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4122 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4123 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4124 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4127 Version 1.5.0 (2015-12-10)
4128 ==========================
4130 * ~700 changes, numerous bugfixes
4136 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4137 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4138 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4139 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4140 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4141 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4142 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4143 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4144 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4145 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4146 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4147 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4148 [`Path::read_link`], [`Path::symlink_metadata`],
4149 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4150 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4151 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4152 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4153 [`slice::split_first_mut`], [`slice::split_first`],
4154 [`slice::split_last_mut`], [`slice::split_last`],
4155 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4156 [`str::MatchIndices`], [`str::RMatchIndices`],
4157 [`str::match_indices`], [`str::rmatch_indices`],
4158 [`str::slice_mut_unchecked`], [`string::ParseError`].
4159 * Rust applications hosted on crates.io can be installed locally to
4160 `~/.cargo/bin` with the [`cargo install`] command. Among other
4161 things this makes it easier to augment Cargo with new subcommands:
4162 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4163 invoked as `cargo foo`.
4164 * Crates with wildcard (`*`) dependencies will [emit warnings when
4165 published][1.5w]. In 1.6 it will no longer be possible to publish
4166 crates with wildcard dependencies.
4171 * The rules determining when a particular lifetime must outlive
4172 a particular value (known as '[dropck]') have been [modified
4173 to not rely on parametricity][1.5p].
4174 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4175 and `Arc`][1.5a]. Because these smart pointer types implement
4176 `Deref`, this causes breakage in cases where the interior type
4177 contains methods of the same name.
4178 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4179 that they could drop their content. Soundness fix.
4180 * All method invocations are [properly checked][1.5wf1] for
4181 [well-formedness][1.5wf2]. Soundness fix.
4182 * Traits whose supertraits contain `Self` are [not object
4183 safe][1.5o]. Soundness fix.
4184 * Target specifications support a [`no_default_libraries`][1.5nd]
4185 setting that controls whether `-nodefaultlibs` is passed to the
4186 linker, and in turn the `is_like_windows` setting no longer affects
4187 the `-nodefaultlibs` flag.
4188 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4189 * The `#[inline]` and `#[repr]` attributes [can only appear
4190 in valid locations][1.5at].
4191 * Native libraries linked from the local crate are [passed to
4192 the linker before native libraries from upstream crates][1.5nl].
4193 * Two rarely-used attributes, `#[no_debug]` and
4194 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4195 * Negation of unsigned integers, which has been a warning for
4196 several releases, [is now behind a feature gate and will
4197 generate errors][1.5nu].
4198 * The parser accidentally accepted visibility modifiers on
4199 enum variants, a bug [which has been fixed][1.5ev].
4200 * [A bug was fixed that allowed `use` statements to import unstable
4206 * When evaluating expressions at compile-time that are not
4207 compile-time constants (const-evaluating expressions in non-const
4208 contexts), incorrect code such as overlong bitshifts and arithmetic
4209 overflow will [generate a warning instead of an error][1.5ce],
4210 delaying the error until runtime. This will allow the
4211 const-evaluator to be expanded in the future backwards-compatibly.
4212 * The `improper_ctypes` lint [no longer warns about using `isize` and
4213 `usize` in FFI][1.5ict].
4218 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4220 * `Default` is [implemented for mutable slices][1.5d].
4221 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4222 * There are now `From` conversions [between floating point
4223 types][1.5f] where the conversions are lossless.
4224 * There are now `From` conversions [between integer types][1.5i] where
4225 the conversions are lossless.
4226 * [`fs::Metadata` implements `Clone`][1.5fs].
4227 * The `parse` method [accepts a leading "+" when parsing
4229 * [`AsMut` is implemented for `Vec`][1.5am].
4230 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4231 been optimized][1.5cf] and no longer rely on the default impl.
4232 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4233 `unsafe extern "C"` function types now [implement `Clone`,
4234 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4235 `fmt::Debug` for up to 12 arguments][1.5fp].
4236 * [Dropping `Vec`s is much faster in unoptimized builds when the
4237 element types don't implement `Drop`][1.5dv].
4238 * A bug that caused in incorrect behavior when [combining `VecDeque`
4239 with zero-sized types][1.5vdz] was resolved.
4240 * [`PartialOrd` for slices is faster][1.5po].
4245 * [Crate metadata size was reduced by 20%][1.5md].
4246 * [Improvements to code generation reduced the size of libcore by 3.3
4247 MB and rustc's memory usage by 18MB][1.5m].
4248 * [Improvements to deref translation increased performance in
4249 unoptimized builds][1.5dr].
4250 * Various errors in trait resolution [are deduplicated to only be
4251 reported once][1.5te].
4252 * Rust has preliminary [support for rumprun kernels][1.5rr].
4253 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4255 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4256 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4257 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4258 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4259 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4260 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4261 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4262 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4263 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4264 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4265 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4266 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4267 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4268 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4269 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4270 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4271 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4272 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4273 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4274 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4275 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4276 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4277 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4278 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4279 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4280 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4281 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4282 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4283 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4284 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4285 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4286 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4287 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4288 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4289 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4290 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4291 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4292 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4293 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4294 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4295 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4296 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4297 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4298 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4299 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4300 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4301 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4302 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4303 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4304 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4305 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4306 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4307 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4308 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4309 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4310 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4311 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4312 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4313 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4314 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4315 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4316 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4317 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4318 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4319 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4320 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4321 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4322 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4323 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4324 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4325 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4326 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4327 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4328 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4329 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4330 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4331 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4332 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4333 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4334 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4335 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4336 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4337 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4338 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4339 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4340 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4341 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4342 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4343 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4345 Version 1.4.0 (2015-10-29)
4346 ==========================
4348 * ~1200 changes, numerous bugfixes
4353 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4354 GNU) are now supported and recommended for use.
4359 * [Several changes have been made to fix type soundness and improve
4360 the behavior of associated types][sound]. See [RFC 1214]. Although
4361 we have mostly introduced these changes as warnings this release, to
4362 become errors next release, there are still some scenarios that will
4363 see immediate breakage.
4364 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4365 line breaks in addition to `\n`][crlf].
4366 * [Loans of `'static` lifetime extend to the end of a function][stat].
4367 * [`str::parse` no longer introduces avoidable rounding error when
4368 parsing floating point numbers. Together with earlier changes to
4369 float formatting/output, "round trips" like f.to_string().parse()
4370 now preserve the value of f exactly. Additionally, leading plus
4371 signs are now accepted][fp3].
4377 * `use` statements that import multiple items [can now rename
4378 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4379 * [Binops work correctly on fat pointers][binfat].
4380 * `pub extern crate`, which does not behave as expected, [issues a
4381 warning][pec] until a better solution is found.
4386 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4387 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4388 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4389 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4390 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4391 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4392 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4393 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4394 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4395 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4396 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4397 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4398 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4399 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4400 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4401 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4402 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4403 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4405 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4406 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4407 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4408 `f64::from_str_radix`.
4409 * [Reverse-searching strings is faster with the 'two-way'
4411 * [`std::io::copy` allows `?Sized` arguments][cc].
4412 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4413 [override `count`, `nth` and `last` with an O(1)
4414 implementation][it].
4415 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4416 * [`IntoRawFd` has been added to the Unix-specific prelude,
4417 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4419 * [`Extend<String>` and `FromIterator<String` are both implemented for
4421 * [`IntoIterator` is implemented for references to `Option` and
4423 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4424 Copy`][ext] as part of [RFC 839]. This will cause type inference
4425 breakage in rare situations.
4426 * [`BinaryHeap` implements `Debug`][bh2].
4427 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4429 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4430 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4431 * [String comparison is faster][faststr].
4432 * `&mut T` where `T: std::fmt::Write` [also implements
4433 `std::fmt::Write`][mutw].
4434 * [A stable regression in `VecDeque::push_back` and other
4435 capacity-altering methods that caused panics for zero-sized types
4437 * [Function pointers implement traits for up to 12 parameters][fp2].
4442 * The compiler [no longer uses the 'morestack' feature to prevent
4443 stack overflow][mm]. Instead it uses guard pages and stack
4444 probes (though stack probes are not yet implemented on any platform
4446 * [The compiler matches traits faster when projections are involved][p].
4447 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4449 * [Cargo now displays useful information about what its doing during
4450 `cargo update`][cu].
4452 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4453 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4454 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4455 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4456 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4457 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4458 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4459 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4460 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4461 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4462 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4463 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4464 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4465 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4466 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4467 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4468 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4469 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4470 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4471 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4472 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4473 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4474 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4475 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4476 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4477 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4478 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4479 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4480 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4481 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4482 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4483 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4484 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4485 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4486 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4487 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4488 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4489 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4490 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4491 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4492 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4493 [bh2]: https://github.com/rust-lang/rust/pull/28156
4494 [binfat]: https://github.com/rust-lang/rust/pull/28270
4495 [bm]: https://github.com/rust-lang/rust/pull/28197
4496 [cc]: https://github.com/rust-lang/rust/pull/27531
4497 [crlf]: https://github.com/rust-lang/rust/pull/28034
4498 [cu]: https://github.com/rust-lang/cargo/pull/1931
4499 [d]: https://github.com/rust-lang/rust/pull/27825
4500 [dep]: https://github.com/rust-lang/rust/pull/28339
4501 [es]: https://github.com/rust-lang/rust/pull/27956
4502 [ext]: https://github.com/rust-lang/rust/pull/28094
4503 [faststr]: https://github.com/rust-lang/rust/pull/28338
4504 [ffi]: https://github.com/rust-lang/rust/pull/28779
4505 [fp]: https://github.com/rust-lang/rust/pull/28268
4506 [fp2]: https://github.com/rust-lang/rust/pull/28560
4507 [fp3]: https://github.com/rust-lang/rust/pull/27307
4508 [i]: https://github.com/rust-lang/rust/pull/27451
4509 [into2]: https://github.com/rust-lang/rust/pull/28039
4510 [it]: https://github.com/rust-lang/rust/pull/27652
4511 [mm]: https://github.com/rust-lang/rust/pull/27338
4512 [mutw]: https://github.com/rust-lang/rust/pull/28368
4513 [sound]: https://github.com/rust-lang/rust/pull/27641
4514 [p]: https://github.com/rust-lang/rust/pull/27866
4515 [pec]: https://github.com/rust-lang/rust/pull/28486
4516 [pr]: https://github.com/rust-lang/rust/pull/27896
4517 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4518 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4519 [s]: https://github.com/rust-lang/rust/pull/27474
4520 [stab]: https://github.com/rust-lang/rust/pull/28339
4521 [stat]: https://github.com/rust-lang/rust/pull/28321
4522 [vd]: https://github.com/rust-lang/rust/pull/28494
4524 Version 1.3.0 (2015-09-17)
4525 ==============================
4527 * ~900 changes, numerous bugfixes
4532 * The [new object lifetime defaults][nold] have been [turned
4533 on][nold2] after a cycle of warnings about the change. Now types
4534 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4535 being interpreted as `&'a Box<Trait+'a>` to `&'a
4536 Box<Trait+'static>`.
4537 * [The Rustonomicon][nom] is a new book in the official documentation
4538 that dives into writing unsafe Rust.
4539 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4540 timekeeping is employed by other std APIs, as well as out-of-tree
4546 * The [new object lifetime defaults][nold] have been [turned
4547 on][nold2] after a cycle of warnings about the change.
4548 * There is a known [regression][lr] in how object lifetime elision is
4549 interpreted, the proper solution for which is undetermined.
4550 * The `#[prelude_import]` attribute, an internal implementation
4551 detail, was accidentally stabilized previously. [It has been put
4552 behind the `prelude_import` feature gate][pi]. This change is
4553 believed to break no existing code.
4554 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4555 [more sane for dynamically sized types][dst3]. Code that relied on
4556 the previous behavior is thought to be broken.
4557 * The `dropck` rules, which checks that destructors can't access
4558 destroyed values, [have been updated][dropck] to match the
4559 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4560 cause some previously-compiling code to no longer build.
4565 * The [new object lifetime defaults][nold] have been [turned
4566 on][nold2] after a cycle of warnings about the change.
4567 * Semicolons may [now follow types and paths in
4568 macros](https://github.com/rust-lang/rust/pull/27000).
4569 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4570 [more sane for dynamically sized types][dst3]. Code that relied on
4571 the previous behavior is not known to exist, and suspected to be
4573 * `'static` variables [may now be recursive][st].
4574 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4575 implementations correctly.
4576 * The `dropck` rules, which checks that destructors can't access
4577 destroyed values, [have been updated][dropck] to match the
4583 * The [`Duration`] API, [has been stabilized][ds], as well as the
4584 `std::time` module, which presently contains only `Duration`.
4585 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4586 * The owned C string, [`CString`], implements [`Borrow`] and the
4587 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4588 these allow C strings to be borrowed and cloned in generic code.
4589 * [`CStr`] implements [`Debug`].
4590 * [`AtomicPtr`] implements [`Debug`].
4591 * [`Error`] trait objects [can be downcast to their concrete types][e]
4592 in many common configurations, using the [`is`], [`downcast`],
4593 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4595 * Searching for substrings now [employs the two-way algorithm][search]
4596 instead of doing a naive search. This gives major speedups to a
4597 number of methods, including [`contains`][sc], [`find`][sf],
4598 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4599 [`ends_with`][sew] are also faster.
4600 * The performance of `PartialEq` for slices is [much faster][ps].
4601 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4602 is overridden and optimized by the implementations for scalars.
4603 * The [`Hasher`] trait now has a number of specialized `write_*`
4604 methods for primitive types, for efficiency.
4605 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4606 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4607 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4608 of [`std::error::Error::cause`][iec] also delegates to the inner
4610 * [`process::Child`][pc] gained the [`id`] method, which returns a
4611 `u32` representing the platform-specific process identifier.
4612 * The [`connect`] method on slices is deprecated, replaced by the new
4613 [`join`] method (note that both of these are on the *unstable*
4614 [`SliceConcatExt`] trait, but through the magic of the prelude are
4615 available to stable code anyway).
4616 * The [`Div`] operator is implemented for [`Wrapping`] types.
4617 * [`DerefMut` is implemented for `String`][dms].
4618 * Performance of SipHash (the default hasher for `HashMap`) is
4619 [better for long data][sh].
4620 * [`AtomicPtr`] implements [`Send`].
4621 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4622 are now [specialized to use uninitialized buffers for increased
4624 * Lifetime parameters of foreign functions [are now resolved
4630 * Rust can now, with some coercion, [produce programs that run on
4631 Windows XP][xp], though XP is not considered a supported platform.
4632 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4633 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4634 recommended for use in 1.3, though should be fully-functional
4635 in the [64-bit 1.4 beta][b14].
4636 * On Fedora-based systems installation will [properly configure the
4637 dynamic linker][fl].
4638 * The compiler gained many new extended error descriptions, which can
4639 be accessed with the `--explain` flag.
4640 * The `dropck` pass, which checks that destructors can't access
4641 destroyed values, [has been rewritten][dropck]. This fixes some
4642 soundness holes, and as such will cause some previously-compiling
4643 code to no longer build.
4644 * `rustc` now uses [LLVM to write archive files where possible][ar].
4645 Eventually this will eliminate the compiler's dependency on the ar
4647 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4648 supported FreeBSD on x86_64).
4649 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4650 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4652 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4653 will kill the process instead of leaking][nlp].
4655 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4656 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4657 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4658 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4659 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4660 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4661 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4662 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4663 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4664 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4665 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4666 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4667 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4668 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4669 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4670 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4671 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4672 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4673 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4674 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4675 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4676 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4677 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4678 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4679 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4680 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4681 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4682 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4683 [ar]: https://github.com/rust-lang/rust/pull/26926
4684 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4685 [dms]: https://github.com/rust-lang/rust/pull/26241
4686 [dropck]: https://github.com/rust-lang/rust/pull/27261
4687 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4688 [ds]: https://github.com/rust-lang/rust/pull/26818
4689 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4690 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4691 [dst3]: https://github.com/rust-lang/rust/pull/27351
4692 [e]: https://github.com/rust-lang/rust/pull/24793
4693 [f]: https://github.com/rust-lang/rust/pull/26588
4694 [fb]: https://github.com/rust-lang/rust/pull/26959
4695 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4696 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4697 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4698 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4699 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4700 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4701 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4702 [lic]: https://github.com/rust-lang/rust/pull/26583
4703 [lnu]: https://github.com/rust-lang/rust/pull/27026
4704 [lr]: https://github.com/rust-lang/rust/issues/27248
4705 [lum]: https://github.com/rust-lang/rust/pull/26378
4706 [lur]: https://github.com/rust-lang/rust/pull/26783
4707 [nlp]: https://github.com/rust-lang/rust/pull/27176
4708 [nold2]: https://github.com/rust-lang/rust/pull/27045
4709 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4710 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4711 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4712 [pi]: https://github.com/rust-lang/rust/pull/26699
4713 [ps]: https://github.com/rust-lang/rust/pull/26884
4714 [rte]: https://github.com/rust-lang/rust/pull/26950
4715 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4716 [search]: https://github.com/rust-lang/rust/pull/26327
4717 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4718 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4719 [sh]: https://github.com/rust-lang/rust/pull/27280
4720 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4721 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4722 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4723 [st]: https://github.com/rust-lang/rust/pull/26630
4724 [win1]: https://github.com/rust-lang/rust/pull/26569
4725 [win2]: https://github.com/rust-lang/rust/pull/26741
4726 [win3]: https://github.com/rust-lang/rust/pull/26741
4727 [win4]: https://github.com/rust-lang/rust/pull/27210
4728 [xp]: https://github.com/rust-lang/rust/pull/26569
4730 Version 1.2.0 (2015-08-07)
4731 ==========================
4733 * ~1200 changes, numerous bugfixes
4738 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4739 like `Rc` to contain types without a fixed size, arrays and trait
4740 objects, finally enabling use of `Rc<[T]>` and completing the
4741 implementation of DST.
4742 * [Parallel codegen][parcodegen] is now working again, which can
4743 substantially speed up large builds in debug mode; It also gets
4744 another ~33% speedup when bootstrapping on a 4 core machine (using 8
4745 jobs). It's not enabled by default, but will be "in the near
4746 future". It can be activated with the `-C codegen-units=N` flag to
4748 * This is the first release with [experimental support for linking
4749 with the MSVC linker and lib C on Windows (instead of using the GNU
4750 variants via MinGW)][win]. It is yet recommended only for the most
4751 intrepid Rustaceans.
4752 * Benchmark compilations are showing a 30% improvement in
4753 bootstrapping over 1.1.
4758 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
4759 unicode case mapping, which is a previously-planned change in
4760 behavior and considered a bugfix.
4761 * [`mem::align_of`] now specifies [the *minimum alignment* for
4762 T][align], which is usually the alignment programs are interested
4763 in, and the same value reported by clang's
4764 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
4766 * [The `#[packed]` attribute is no longer silently accepted by the
4767 compiler][packed]. This attribute did nothing and code that
4768 mentioned it likely did not work as intended.
4769 * Associated type defaults are [now behind the
4770 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
4771 defaults *did not work*, but could be mentioned syntactically. As
4772 such this breakage has minimal impact.
4777 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4778 matching against dereferencable values.
4783 * The [`Extend`] trait, which grows a collection from an iterator, is
4784 implemented over iterators of references, for `String`, `Vec`,
4785 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4786 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4787 * The [`iter::once`] function returns an iterator that yields a single
4788 element, and [`iter::empty`] returns an iterator that yields no
4790 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4791 over substring matches.
4792 * [`Cell`] and [`RefCell`] both implement `Eq`.
4793 * A number of methods for wrapping arithmetic are added to the
4794 integral types, [`wrapping_div`], [`wrapping_rem`],
4795 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4796 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4797 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4798 type.. It is illegal for the default arithmetic operations in Rust
4799 to overflow; the desire to wrap must be explicit.
4800 * The `{:#?}` formatting specifier [displays the alternate,
4801 pretty-printed][debugfmt] form of the `Debug` formatter. This
4802 feature was actually introduced prior to 1.0 with little
4804 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4805 for writing data to formatted strings, similar to [`io::Write`].
4806 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4807 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4808 are used by code generators to emit implementations of [`Debug`].
4809 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4810 methods that convert case, following Unicode case mapping.
4811 * It is now easier to handle poisoned locks. The [`PoisonError`]
4812 type, returned by failing lock operations, exposes `into_inner`,
4813 `get_ref`, and `get_mut`, which all give access to the inner lock
4814 guard, and allow the poisoned lock to continue to operate. The
4815 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4816 poisoned lock without attempting to take the lock.
4817 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4818 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4819 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4820 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4822 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4828 * `rustc` employs smarter heuristics for guessing at [typos].
4829 * `rustc` emits more efficient code for [no-op conversions between
4830 unsafe pointers][nop].
4831 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4832 resulting in faster compile times and smaller code.
4834 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4835 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4836 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4837 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4838 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4839 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4840 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4841 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4842 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4843 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4844 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4845 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4846 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4847 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4848 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4849 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4850 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4851 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4852 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4853 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4854 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4855 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4856 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4857 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4858 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4859 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4860 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4861 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4862 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4863 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4864 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4865 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4866 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4867 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4868 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4869 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4870 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4871 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4872 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4873 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4874 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4875 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4876 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4877 [align]: https://github.com/rust-lang/rust/pull/25646
4878 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4879 [typos]: https://github.com/rust-lang/rust/pull/26087
4880 [nop]: https://github.com/rust-lang/rust/pull/26336
4881 [fat]: https://github.com/rust-lang/rust/pull/26411
4882 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4883 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4884 [packed]: https://github.com/rust-lang/rust/pull/25541
4885 [ad]: https://github.com/rust-lang/rust/pull/27382
4886 [win]: https://github.com/rust-lang/rust/pull/25350
4888 Version 1.1.0 (2015-06-25)
4889 =========================
4891 * ~850 changes, numerous bugfixes
4896 * The [`std::fs` module has been expanded][fs] to expand the set of
4897 functionality exposed:
4898 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4899 don't incur a syscall on some platforms.
4900 * A `symlink_metadata` function has been added.
4901 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4902 access to all underlying information.
4903 * The compiler now contains extended explanations of many errors. When an error
4904 with an explanation occurs the compiler suggests using the `--explain` flag
4905 to read the explanation. Error explanations are also [available online][err-index].
4906 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4907 well as other work, the time to bootstrap the compiler decreased by
4913 * The [`str::split_whitespace`] method splits a string on unicode
4914 whitespace boundaries.
4915 * On both Windows and Unix, new extension traits provide conversion of
4916 I/O types to and from the underlying system handles. On Unix, these
4917 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4918 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4919 `TcpListener`, and `UpdSocket`. Further implementations for
4920 `std::process` will be stabilized later.
4921 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4922 Windows, symlinks can be created with
4923 `std::os::windows::symlink_dir` and
4924 `std::os::windows::symlink_file`.
4925 * The `mpsc::Receiver` type can now be converted into an iterator with
4926 `into_iter` on the [`IntoIterator`] trait.
4927 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4928 implementation of the [`From`] trait.
4929 * The `Debug` implementation for `RangeFull` [creates output that is
4930 more consistent with other implementations][rf].
4931 * [`Debug` is implemented for `File`][file].
4932 * The `Default` implementation for `Arc` [no longer requires `Sync +
4934 * [The `Iterator` methods `count`, `nth`, and `last` have been
4935 overridden for slices to have O(1) performance instead of O(n)][si].
4936 * Incorrect handling of paths on Windows has been improved in both the
4937 compiler and the standard library.
4938 * [`AtomicPtr` gained a `Default` implementation][ap].
4939 * In accordance with Rust's policy on arithmetic overflow `abs` now
4940 [panics on overflow when debug assertions are enabled][abs].
4941 * The [`Cloned`] iterator, which was accidentally left unstable for
4942 1.0 [has been stabilized][c].
4943 * The [`Incoming`] iterator, which iterates over incoming TCP
4944 connections, and which was accidentally unnamable in 1.0, [is now
4945 properly exported][inc].
4946 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4947 `sift_up` or `sift_down` panic][bh].
4948 * The [`split_off`] method of `LinkedList` [no longer corrupts
4949 the list in certain scenarios][ll].
4954 * Type checking performance [has improved notably][sk] with
4955 [multiple improvements][pre].
4956 * The compiler [suggests code changes][ch] for more errors.
4957 * rustc and it's build system have experimental support for [building
4958 toolchains against MUSL][m] instead of glibc on Linux.
4959 * The compiler defines the `target_env` cfg value, which is used for
4960 distinguishing toolchains that are otherwise for the same
4961 platform. Presently this is set to `gnu` for common GNU Linux
4962 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4963 * The [`cargo rustc`][crc] command invokes a build with custom flags
4965 * [Android executables are always position independent][pie].
4966 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4969 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4970 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4971 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4972 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4973 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4974 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4975 [rf]: https://github.com/rust-lang/rust/pull/24491
4976 [err-index]: https://doc.rust-lang.org/error-index.html
4977 [sk]: https://github.com/rust-lang/rust/pull/24615
4978 [pre]: https://github.com/rust-lang/rust/pull/25323
4979 [file]: https://github.com/rust-lang/rust/pull/24598
4980 [ch]: https://github.com/rust-lang/rust/pull/24683
4981 [arc]: https://github.com/rust-lang/rust/pull/24695
4982 [si]: https://github.com/rust-lang/rust/pull/24701
4983 [ap]: https://github.com/rust-lang/rust/pull/24834
4984 [m]: https://github.com/rust-lang/rust/pull/24777
4985 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
4986 [crc]: https://github.com/rust-lang/cargo/pull/1568
4987 [pie]: https://github.com/rust-lang/rust/pull/24953
4988 [abs]: https://github.com/rust-lang/rust/pull/25441
4989 [c]: https://github.com/rust-lang/rust/pull/25496
4990 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
4991 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
4992 [inc]: https://github.com/rust-lang/rust/pull/25522
4993 [bh]: https://github.com/rust-lang/rust/pull/25856
4994 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
4995 [ll]: https://github.com/rust-lang/rust/pull/26022
4996 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
4997 [drop]: https://github.com/rust-lang/rust/pull/24935
4999 Version 1.0.0 (2015-05-15)
5000 ========================
5002 * ~1500 changes, numerous bugfixes
5007 * The vast majority of the standard library is now `#[stable]`. It is
5008 no longer possible to use unstable features with a stable build of
5010 * Many popular crates on [crates.io] now work on the stable release
5012 * Arithmetic on basic integer types now [checks for overflow in debug
5018 * Several [restrictions have been added to trait coherence][coh] in
5019 order to make it easier for upstream authors to change traits
5020 without breaking downstream code.
5021 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5022 improve error messages and macro behavior. For example, `0b1234` is
5023 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5024 * Trait bounds [are always invariant][inv], eliminating the need for
5025 the `PhantomFn` and `MarkerTrait` lang items, which have been
5027 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5028 "foo" as bar` syntax has been replaced with `extern crate foo as
5029 bar`, and Cargo now automatically translates "-" in *package* names
5030 to underscore for the crate name.
5031 * [Lifetime shadowing is an error][lt].
5032 * [`Send` no longer implies `'static`][send-rfc].
5033 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5034 `MyType::default()`.
5035 * Primitive types [now have inherent methods][prim-inherent],
5036 obviating the need for extension traits like `SliceExt`.
5037 * Methods with `Self: Sized` in their `where` clause are [considered
5038 object-safe][self-sized], allowing many extension traits like
5039 `IteratorExt` to be merged into the traits they extended.
5040 * You can now [refer to associated types][assoc-where] whose
5041 corresponding trait bounds appear only in a `where` clause.
5042 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5043 like `Send` and `Sync` are now library-defined.
5044 * A [Reflect trait][reflect] was introduced, which means that
5045 downcasting via the `Any` trait is effectively limited to concrete
5046 types. This helps retain the potentially-important "parametricity"
5047 property: generic code cannot behave differently for different type
5048 arguments except in minor ways.
5049 * The `unsafe_destructor` feature is now deprecated in favor of the
5050 [new `dropck`][dropck]. This change is a major reduction in unsafe
5056 * The `thread_local` module [has been renamed to `std::thread`][th].
5057 * The methods of `IteratorExt` [have been moved to the `Iterator`
5059 * Several traits that implement Rust's conventions for type
5060 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5061 [centralized in the `std::convert` module][con].
5062 * The `FromError` trait [was removed in favor of `From`][fe].
5063 * The basic sleep function [has moved to
5064 `std::thread::sleep_ms`][slp].
5065 * The `splitn` function now takes an `n` parameter that represents the
5066 number of items yielded by the returned iterator [instead of the
5067 number of 'splits'][spl].
5068 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5069 * [Derived implementations of `PartialOrd` now order enums according
5070 to their explicitly-assigned discriminants][po].
5071 * [Methods for searching strings are generic over `Pattern`s][pat],
5072 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5074 * [In method resolution, object methods are resolved before inherent
5076 * [`String::from_str` has been deprecated in favor of the `From` impl,
5077 `String::from`][sf].
5078 * [`io::Error` implements `Sync`][ios].
5079 * [The `words` method on `&str` has been replaced with
5080 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5082 * The new path and IO modules are complete and `#[stable]`. This
5083 was the major library focus for this cycle.
5084 * The path API was [revised][path-normalize] to normalize `.`,
5085 adjusting the tradeoffs in favor of the most common usage.
5086 * A large number of remaining APIs in `std` were also stabilized
5087 during this cycle; about 75% of the non-deprecated API surface
5089 * The new [string pattern API][string-pattern] landed, which makes
5090 the string slice API much more internally consistent and flexible.
5091 * A new set of [generic conversion traits][conversion] replaced
5092 many existing ad hoc traits.
5093 * Generic numeric traits were [completely removed][num-traits]. This
5094 was made possible thanks to inherent methods for primitive types,
5095 and the removal gives maximal flexibility for designing a numeric
5096 hierarchy in the future.
5097 * The `Fn` traits are now related via [inheritance][fn-inherit]
5098 and provide ergonomic [blanket implementations][fn-blanket].
5099 * The `Index` and `IndexMut` traits were changed to
5100 [take the index by value][index-value], enabling code like
5101 `hash_map["string"]` to work.
5102 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5103 `Copy` data is known to be `Clone` as well.
5108 * Many errors now have extended explanations that can be accessed with
5109 the `--explain` flag to `rustc`.
5110 * Many new examples have been added to the standard library
5112 * rustdoc has received a number of improvements focused on completion
5114 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5115 * Much headway was made on ecosystem-wide CI, making it possible
5116 to [compare builds for breakage][ci-compare].
5119 [crates.io]: http://crates.io
5120 [clo]: https://github.com/rust-lang/rust/pull/24034
5121 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5122 [con]: https://github.com/rust-lang/rust/pull/23875
5123 [cr]: https://github.com/rust-lang/rust/pull/23419
5124 [fe]: https://github.com/rust-lang/rust/pull/23879
5125 [ie]: https://github.com/rust-lang/rust/pull/23300
5126 [inv]: https://github.com/rust-lang/rust/pull/23938
5127 [ios]: https://github.com/rust-lang/rust/pull/24133
5128 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5129 [lt]: https://github.com/rust-lang/rust/pull/24057
5130 [meth]: https://github.com/rust-lang/rust/pull/24056
5131 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5132 [po]: https://github.com/rust-lang/rust/pull/24270
5133 [sf]: https://github.com/rust-lang/rust/pull/24517
5134 [slp]: https://github.com/rust-lang/rust/pull/23949
5135 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5136 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5137 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5138 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5139 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5140 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5141 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5142 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5143 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5144 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5145 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5146 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5147 [reflect]: https://github.com/rust-lang/rust/pull/23712
5148 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5149 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5150 [index-value]: https://github.com/rust-lang/rust/pull/23601
5151 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5152 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5153 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5154 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5155 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5156 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5159 Version 1.0.0-alpha.2 (2015-02-20)
5160 =====================================
5162 * ~1300 changes, numerous bugfixes
5166 * The various I/O modules were [overhauled][io-rfc] to reduce
5167 unnecessary abstractions and provide better interoperation with
5168 the underlying platform. The old `io` module remains temporarily
5170 * The standard library now [participates in feature gating][feat],
5171 so use of unstable libraries now requires a `#![feature(...)]`
5172 attribute. The impact of this change is [described on the
5173 forum][feat-forum]. [RFC][feat-rfc].
5177 * `for` loops [now operate on the `IntoIterator` trait][into],
5178 which eliminates the need to call `.iter()`, etc. to iterate
5179 over collections. There are some new subtleties to remember
5180 though regarding what sort of iterators various types yield, in
5181 particular that `for foo in bar { }` yields values from a move
5182 iterator, destroying the original collection. [RFC][into-rfc].
5183 * Objects now have [default lifetime bounds][obj], so you don't
5184 have to write `Box<Trait+'static>` when you don't care about
5185 storing references. [RFC][obj-rfc].
5186 * In types that implement `Drop`, [lifetimes must outlive the
5187 value][drop]. This will soon make it possible to safely
5188 implement `Drop` for types where `#[unsafe_destructor]` is now
5189 required. Read the [gorgeous RFC][drop-rfc] for details.
5190 * The fully qualified <T as Trait>::X syntax lets you set the Self
5191 type for a trait method or associated type. [RFC][ufcs-rfc].
5192 * References to types that implement `Deref<U>` now [automatically
5193 coerce to references][deref] to the dereferenced type `U`,
5194 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5195 should eliminate many unsightly uses of `&*`, as when converting
5196 from references to vectors into references to
5197 slices. [RFC][deref-rfc].
5198 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5199 `|:|`) is obsolete and closure kind is inferred from context.
5200 * [`Self` is a keyword][Self].
5204 * The `Show` and `String` formatting traits [have been
5205 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5206 their related purposes. Automatically getting a string
5207 conversion to use with `format!("{:?}", something_to_debug)` is
5208 now written `#[derive(Debug)]`.
5209 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5210 OsStr}`, provide strings in platform-specific encodings for easier
5211 interop with system APIs. [RFC][osstr-rfc].
5212 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5213 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5214 creating raw pointers.
5218 * Certain long error messages of the form 'expected foo found bar'
5219 are now [split neatly across multiple
5220 lines][multiline]. Examples in the PR.
5221 * On Unix Rust can be [uninstalled][un] by running
5222 `/usr/local/lib/rustlib/uninstall.sh`.
5223 * The `#[rustc_on_unimplemented]` attribute, requiring the
5224 'on_unimplemented' feature, lets rustc [display custom error
5225 messages when a trait is expected to be implemented for a type
5230 * Rust is tested against a [LALR grammar][lalr], which parses
5231 almost all the Rust files that rustc does.
5233 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5234 [close]: https://github.com/rust-lang/rust/pull/21843
5235 [deref]: https://github.com/rust-lang/rust/pull/21351
5236 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5237 [drop]: https://github.com/rust-lang/rust/pull/21972
5238 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5239 [feat]: https://github.com/rust-lang/rust/pull/21248
5240 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5241 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5242 [fmt]: https://github.com/rust-lang/rust/pull/21457
5243 [into]: https://github.com/rust-lang/rust/pull/20790
5244 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5245 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5246 [lalr]: https://github.com/rust-lang/rust/pull/21452
5247 [multiline]: https://github.com/rust-lang/rust/pull/19870
5248 [obj]: https://github.com/rust-lang/rust/pull/22230
5249 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5250 [onun]: https://github.com/rust-lang/rust/pull/20889
5251 [osstr]: https://github.com/rust-lang/rust/pull/21488
5252 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5253 [Self]: https://github.com/rust-lang/rust/pull/22158
5254 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5255 [un]: https://github.com/rust-lang/rust/pull/22256
5258 Version 1.0.0-alpha (2015-01-09)
5259 ==================================
5261 * ~2400 changes, numerous bugfixes
5265 * The language itself is considered feature complete for 1.0,
5266 though there will be many usability improvements and bugfixes
5267 before the final release.
5268 * Nearly 50% of the public API surface of the standard library has
5269 been declared 'stable'. Those interfaces are unlikely to change
5271 * The long-running debate over integer types has been
5272 [settled][ints]: Rust will ship with types named `isize` and
5273 `usize`, rather than `int` and `uint`, for pointer-sized
5274 integers. Guidelines will be rolled out during the alpha cycle.
5275 * Most crates that are not `std` have been moved out of the Rust
5276 distribution into the Cargo ecosystem so they can evolve
5277 separately and don't need to be stabilized as quickly, including
5278 'time', 'getopts', 'num', 'regex', and 'term'.
5279 * Documentation continues to be expanded with more API coverage, more
5280 examples, and more in-depth explanations. The guides have been
5281 consolidated into [The Rust Programming Language][trpl].
5282 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5283 * All official Rust binary installers now come with [Cargo], the
5284 Rust package manager.
5288 * Closures have been [completely redesigned][unboxed] to be
5289 implemented in terms of traits, can now be used as generic type
5290 bounds and thus monomorphized and inlined, or via an opaque
5291 pointer (boxed) as in the old system. The new system is often
5292 referred to as 'unboxed' closures.
5293 * Traits now support [associated types][assoc], allowing families
5294 of related types to be defined together and used generically in
5296 * Enum variants are [namespaced by their type names][enum].
5297 * [`where` clauses][where] provide a more versatile and attractive
5298 syntax for specifying generic bounds, though the previous syntax
5300 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5302 * Rust [no longer has a runtime][rt] of any description, and only
5303 supports OS threads, not green threads.
5304 * At long last, Rust has been overhauled for 'dynamically-sized
5305 types' ([DST]), which integrates 'fat pointers' (object types,
5306 arrays, and `str`) more deeply into the type system, making it
5308 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5309 `..j` that produce range types and which, when combined with the
5310 `Index` operator and multidispatch, leads to a convenient slice
5312 * The new range syntax revealed an ambiguity in the fixed-length
5313 array syntax, so now fixed length arrays [are written `[T;
5315 * The `Copy` trait is no longer implemented automatically. Unsafe
5316 pointers no longer implement `Sync` and `Send` so types
5317 containing them don't automatically either. `Sync` and `Send`
5318 are now 'unsafe traits' so one can "forcibly" implement them via
5319 `unsafe impl` if a type confirms to the requirements for them
5320 even though the internals do not (e.g. structs containing unsafe
5321 pointers like `Arc`). These changes are intended to prevent some
5322 footguns and are collectively known as [opt-in built-in
5323 traits][oibit] (though `Sync` and `Send` will soon become pure
5324 library types unknown to the compiler).
5325 * Operator traits now take their operands [by value][ops], and
5326 comparison traits can use multidispatch to compare one type
5327 against multiple other types, allowing e.g. `String` to be
5328 compared with `&str`.
5329 * `if let` and `while let` are no longer feature-gated.
5330 * Rust has adopted a more [uniform syntax for escaping unicode
5331 characters][unicode].
5332 * `macro_rules!` [has been declared stable][mac]. Though it is a
5333 flawed system it is sufficiently popular that it must be usable
5334 for 1.0. Effort has gone into [future-proofing][mac-future] it
5335 in ways that will allow other macro systems to be developed in
5336 parallel, and won't otherwise impact the evolution of the
5338 * The prelude has been [pared back significantly][prelude] such
5339 that it is the minimum necessary to support the most pervasive
5340 code patterns, and through [generalized where clauses][where]
5341 many of the prelude extension traits have been consolidated.
5342 * Rust's rudimentary reflection [has been removed][refl], as it
5343 incurred too much code generation for little benefit.
5344 * [Struct variants][structvars] are no longer feature-gated.
5345 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5346 known as 'higher-ranked trait bounds', this crucially allows
5347 unboxed closures to work.
5348 * Macros invocations surrounded by parens or square brackets and
5349 not terminated by a semicolon are [parsed as
5350 expressions][macros], which makes expressions like `vec![1i32,
5351 2, 3].len()` work as expected.
5352 * Trait objects now implement their traits automatically, and
5353 traits that can be coerced to objects now must be [object
5355 * Automatically deriving traits is now done with `#[derive(...)]`
5356 not `#[deriving(...)]` for [consistency with other naming
5357 conventions][derive].
5358 * Importing the containing module or enum at the same time as
5359 items or variants they contain is [now done with `self` instead
5360 of `mod`][self], as in use `foo::{self, bar}`
5361 * Glob imports are no longer feature-gated.
5362 * The `box` operator and `box` patterns have been feature-gated
5363 pending a redesign. For now unique boxes should be allocated
5364 like other containers, with `Box::new`.
5368 * A [series][coll1] of [efforts][coll2] to establish
5369 [conventions][coll3] for collections types has resulted in API
5370 improvements throughout the standard library.
5371 * New [APIs for error handling][err] provide ergonomic interop
5372 between error types, and [new conventions][err-conv] describe
5373 more clearly the recommended error handling strategies in Rust.
5374 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5375 it is easier to discuss failure in the context of error handling
5376 without making clarifications as to whether you are referring to
5377 the 'fail' macro or failure more generally.
5378 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5379 syscall when available.
5380 * The 'serialize' crate has been renamed 'rustc-serialize' and
5381 moved out of the distribution to Cargo. Although it is widely
5382 used now, it is expected to be superseded in the near future.
5383 * The `Show` formatter, typically implemented with
5384 `#[derive(Show)]` is [now requested with the `{:?}`
5385 specifier][show] and is intended for use by all types, for uses
5386 such as `println!` debugging. The new `String` formatter must be
5387 implemented by hand, uses the `{}` specifier, and is intended
5388 for full-fidelity conversions of things that can logically be
5389 represented as strings.
5393 * [Flexible target specification][flex] allows rustc's code
5394 generation to be configured to support otherwise-unsupported
5396 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5397 respective debuggers with Rust-appropriate pretty-printing.
5398 * The Windows installation of Rust is distributed with the
5399 MinGW components currently required to link binaries on that
5404 * Nullable enum optimizations have been extended to more types so
5405 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5406 space than the inner types themselves.
5407 * Work has begun on supporting AArch64.
5409 [Cargo]: https://crates.io
5410 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5411 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5412 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5413 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5414 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5415 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5416 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5417 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5418 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5419 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5420 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5421 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5422 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5423 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5424 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5425 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5426 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5427 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5428 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5429 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5430 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5431 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5432 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5433 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5434 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5435 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5436 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5437 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5438 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5439 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5440 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5441 [trpl]: https://doc.rust-lang.org/book/index.html
5442 [rbe]: http://rustbyexample.com/
5445 Version 0.12.0 (2014-10-09)
5446 =============================
5448 * ~1900 changes, numerous bugfixes
5452 * The introductory documentation (now called The Rust Guide) has
5453 been completely rewritten, as have a number of supplementary
5455 * Rust's package manager, Cargo, continues to improve and is
5456 sometimes considered to be quite awesome.
5457 * Many API's in `std` have been reviewed and updated for
5458 consistency with the in-development Rust coding
5459 guidelines. The standard library documentation tracks
5460 stabilization progress.
5461 * Minor libraries have been moved out-of-tree to the rust-lang org
5462 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5463 be installed with Cargo.
5464 * Lifetime elision allows lifetime annotations to be left off of
5465 function declarations in many common scenarios.
5466 * Rust now works on 64-bit Windows.
5469 * Indexing can be overloaded with the `Index` and `IndexMut`
5471 * The `if let` construct takes a branch only if the `let` pattern
5472 matches, currently behind the 'if_let' feature gate.
5473 * 'where clauses', a more flexible syntax for specifying trait
5474 bounds that is more aesthetic, have been added for traits and
5475 free functions. Where clauses will in the future make it
5476 possible to constrain associated types, which would be
5477 impossible with the existing syntax.
5478 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5479 the 'slicing_syntax' feature gate, and can be overloaded with
5480 the `Slice` or `SliceMut` traits.
5481 * The syntax for matching of sub-slices has been changed to use a
5482 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5483 consistency with other uses of `..` and to future-proof
5484 potential additional uses of the syntax.
5485 * The syntax for matching inclusive ranges in patterns has changed
5486 from `0..3` to `0...4` to be consistent with the exclusive range
5488 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5489 c]`) has been put behind the 'advanced_slice_patterns' feature
5490 gate and may be removed in the future.
5491 * Components of tuples and tuple structs can be extracted using
5492 the `value.0` syntax, currently behind the `tuple_indexing`
5494 * The `#[crate_id]` attribute is no longer supported; versioning
5495 is handled by the package manager.
5496 * Renaming crate imports are now written `extern crate foo as bar`
5497 instead of `extern crate bar = foo`.
5498 * Renaming use statements are now written `use foo as bar` instead
5500 * `let` and `match` bindings and argument names in macros are now
5502 * The new, more efficient, closure types ('unboxed closures') have
5503 been added under a feature gate, 'unboxed_closures'. These will
5504 soon replace the existing closure types, once higher-ranked
5505 trait lifetimes are added to the language.
5506 * `move` has been added as a keyword, for indicating closures
5507 that capture by value.
5508 * Mutation and assignment is no longer allowed in pattern guards.
5509 * Generic structs and enums can now have trait bounds.
5510 * The `Share` trait is now called `Sync` to free up the term
5511 'shared' to refer to 'shared reference' (the default reference
5513 * Dynamically-sized types have been mostly implemented,
5514 unifying the behavior of fat-pointer types with the rest of the
5516 * As part of dynamically-sized types, the `Sized` trait has been
5517 introduced, which qualifying types implement by default, and
5518 which type parameters expect by default. To specify that a type
5519 parameter does not need to be sized, write `<Sized? T>`. Most
5520 types are `Sized`, notable exceptions being unsized arrays
5521 (`[T]`) and trait types.
5522 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5523 * Lifetime bounds can now be applied to type parameters and object
5525 * The old, reference counted GC type, `Gc<T>` which was once
5526 denoted by the `@` sigil, has finally been removed. GC will be
5527 revisited in the future.
5530 * Library documentation has been improved for a number of modules.
5531 * Bit-vectors, collections::bitv has been modernized.
5532 * The url crate is deprecated in favor of
5533 http://github.com/servo/rust-url, which can be installed with
5535 * Most I/O stream types can be cloned and subsequently closed from
5537 * A `std::time::Duration` type has been added for use in I/O
5538 methods that rely on timers, as well as in the 'time' crate's
5539 `Timespec` arithmetic.
5540 * The runtime I/O abstraction layer that enabled the green thread
5541 scheduler to do non-thread-blocking I/O has been removed, along
5542 with the libuv-based implementation employed by the green thread
5543 scheduler. This will greatly simplify the future I/O work.
5544 * `collections::btree` has been rewritten to have a more
5545 idiomatic and efficient design.
5548 * rustdoc output now indicates the stability levels of API's.
5549 * The `--crate-name` flag can specify the name of the crate
5550 being compiled, like `#[crate_name]`.
5551 * The `-C metadata` specifies additional metadata to hash into
5552 symbol names, and `-C extra-filename` specifies additional
5553 information to put into the output filename, for use by the
5554 package manager for versioning.
5555 * debug info generation has continued to improve and should be
5556 more reliable under both gdb and lldb.
5557 * rustc has experimental support for compiling in parallel
5558 using the `-C codegen-units` flag.
5559 * rustc no longer encodes rpath information into binaries by
5563 * Stack usage has been optimized with LLVM lifetime annotations.
5564 * Official Rust binaries on Linux are more compatible with older
5565 kernels and distributions, built on CentOS 5.10.
5568 Version 0.11.0 (2014-07-02)
5569 ==========================
5571 * ~1700 changes, numerous bugfixes
5574 * ~[T] has been removed from the language. This type is superseded by
5576 * ~str has been removed from the language. This type is superseded by
5578 * ~T has been removed from the language. This type is superseded by the
5580 * @T has been removed from the language. This type is superseded by the
5581 standard library's std::gc::Gc<T> type.
5582 * Struct fields are now all private by default.
5583 * Vector indices and shift amounts are both required to be a `uint`
5584 instead of any integral type.
5585 * Byte character, byte string, and raw byte string literals are now all
5586 supported by prefixing the normal literal with a `b`.
5587 * Multiple ABIs are no longer allowed in an ABI string
5588 * The syntax for lifetimes on closures/procedures has been tweaked
5589 slightly: `<'a>|A, B|: 'b + K -> T`
5590 * Floating point modulus has been removed from the language; however it
5591 is still provided by a library implementation.
5592 * Private enum variants are now disallowed.
5593 * The `priv` keyword has been removed from the language.
5594 * A closure can no longer be invoked through a &-pointer.
5595 * The `use foo, bar, baz;` syntax has been removed from the language.
5596 * The transmute intrinsic no longer works on type parameters.
5597 * Statics now allow blocks/items in their definition.
5598 * Trait bounds are separated from objects with + instead of : now.
5599 * Objects can no longer be read while they are mutably borrowed.
5600 * The address of a static is now marked as insignificant unless the
5601 #[inline(never)] attribute is placed it.
5602 * The #[unsafe_destructor] attribute is now behind a feature gate.
5603 * Struct literals are no longer allowed in ambiguous positions such as
5604 if, while, match, and for..in.
5605 * Declaration of lang items and intrinsics are now feature-gated by
5607 * Integral literals no longer default to `int`, and floating point
5608 literals no longer default to `f64`. Literals must be suffixed with an
5609 appropriate type if inference cannot determine the type of the
5611 * The Box<T> type is no longer implicitly borrowed to &mut T.
5612 * Procedures are now required to not capture borrowed references.
5615 * The standard library is now a "facade" over a number of underlying
5616 libraries. This means that development on the standard library should
5617 be speedier due to smaller crates, as well as a clearer line between
5619 * A new library, libcore, lives under the standard library's facade
5620 which is Rust's "0-assumption" library, suitable for embedded and
5621 kernel development for example.
5622 * A regex crate has been added to the standard distribution. This crate
5623 includes statically compiled regular expressions.
5624 * The unwrap/unwrap_err methods on Result require a Show bound for
5625 better error messages.
5626 * The return types of the std::comm primitives have been centralized
5627 around the Result type.
5628 * A number of I/O primitives have gained the ability to time out their
5630 * A number of I/O primitives have gained the ability to close their
5631 reading/writing halves to cancel pending operations.
5632 * Reverse iterator methods have been removed in favor of `rev()` on
5633 their forward-iteration counterparts.
5634 * A bitflags! macro has been added to enable easy interop with C and
5635 management of bit flags.
5636 * A debug_assert! macro is now provided which is disabled when
5637 `--cfg ndebug` is passed to the compiler.
5638 * A graphviz crate has been added for creating .dot files.
5639 * The std::cast module has been migrated into std::mem.
5640 * The std::local_data api has been migrated from freestanding functions
5641 to being based on methods.
5642 * The Pod trait has been renamed to Copy.
5643 * jemalloc has been added as the default allocator for types.
5644 * The API for allocating memory has been changed to use proper alignment
5645 and sized deallocation
5646 * Connecting a TcpStream or binding a TcpListener is now based on a
5647 string address and a u16 port. This allows connecting to a hostname as
5649 * The Reader trait now contains a core method, read_at_least(), which
5650 correctly handles many repeated 0-length reads.
5651 * The process-spawning API is now centered around a builder-style
5653 * The :? printing qualifier has been moved from the standard library to
5654 an external libdebug crate.
5655 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5656 have been renamed to Eq/Ord.
5657 * The select/plural methods have been removed from format!. The escapes
5658 for { and } have also changed from \{ and \} to {{ and }},
5660 * The TaskBuilder API has been re-worked to be a true builder, and
5661 extension traits for spawning native/green tasks have been added.
5664 * All breaking changes to the language or libraries now have their
5665 commit message annotated with `[breaking-change]` to allow for easy
5666 discovery of breaking changes.
5667 * The compiler will now try to suggest how to annotate lifetimes if a
5668 lifetime-related error occurs.
5669 * Debug info continues to be improved greatly with general bug fixes and
5670 better support for situations like link time optimization (LTO).
5671 * Usage of syntax extensions when cross-compiling has been fixed.
5672 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5673 -fdata-sections and --gc-sections has been enabled by default
5674 * The compiler is now stricter about where it will load module files
5675 from when a module is declared via `mod foo;`.
5676 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5677 Syntax extensions are now discovered via a "plugin registrar" type
5678 which will be extended in the future to other various plugins.
5679 * Lints have been restructured to allow for dynamically loadable lints.
5680 * A number of rustdoc improvements:
5681 * The HTML output has been visually redesigned.
5682 * Markdown is now powered by hoedown instead of sundown.
5683 * Searching heuristics have been greatly improved.
5684 * The search index has been reduced in size by a great amount.
5685 * Cross-crate documentation via `pub use` has been greatly improved.
5686 * Primitive types are now hyperlinked and documented.
5687 * Documentation has been moved from static.rust-lang.org/doc to
5689 * A new sandbox, play.rust-lang.org, is available for running and
5690 sharing rust code examples on-line.
5691 * Unused attributes are now more robustly warned about.
5692 * The dead_code lint now warns about unused struct fields.
5693 * Cross-compiling to iOS is now supported.
5694 * Cross-compiling to mipsel is now supported.
5695 * Stability attributes are now inherited by default and no longer apply
5696 to intra-crate usage, only inter-crate usage.
5697 * Error message related to non-exhaustive match expressions have been
5701 Version 0.10 (2014-04-03)
5702 =========================
5704 * ~1500 changes, numerous bugfixes
5707 * A new RFC process is now in place for modifying the language.
5708 * Patterns with `@`-pointers have been removed from the language.
5709 * Patterns with unique vectors (`~[T]`) have been removed from the
5711 * Patterns with unique strings (`~str`) have been removed from the
5713 * `@str` has been removed from the language.
5714 * `@[T]` has been removed from the language.
5715 * `@self` has been removed from the language.
5716 * `@Trait` has been removed from the language.
5717 * Headers on `~` allocations which contain `@` boxes inside the type for
5718 reference counting have been removed.
5719 * The semantics around the lifetimes of temporary expressions have changed,
5720 see #3511 and #11585 for more information.
5721 * Cross-crate syntax extensions are now possible, but feature gated. See
5722 #11151 for more information. This includes both `macro_rules!` macros as
5723 well as syntax extensions such as `format!`.
5724 * New lint modes have been added, and older ones have been turned on to be
5726 * Unnecessary parentheses
5729 * Uppercase variables
5730 * Publicly visible private types
5731 * `#[deriving]` with raw pointers
5732 * Unsafe functions can no longer be coerced to closures.
5733 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5734 * The `#[simd]` attribute is now behind a feature gate.
5735 * Visibility is no longer allowed on `extern crate` statements, and
5736 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5737 * Trailing commas are now allowed in argument lists and tuple patterns.
5738 * The `do` keyword has been removed, it is now a reserved keyword.
5739 * Default type parameters have been implemented, but are feature gated.
5740 * Borrowed variables through captures in closures are now considered soundly.
5741 * `extern mod` is now `extern crate`
5742 * The `Freeze` trait has been removed.
5743 * The `Share` trait has been added for types that can be shared among
5745 * Labels in macros are now hygienic.
5746 * Expression/statement macro invocations can be delimited with `{}` now.
5747 * Treatment of types allowed in `static mut` locations has been tweaked.
5748 * The `*` and `.` operators are now overloadable through the `Deref` and
5750 * `~Trait` and `proc` no longer have `Send` bounds by default.
5751 * Partial type hints are now supported with the `_` type marker.
5752 * An `Unsafe` type was introduced for interior mutability. It is now
5753 considered undefined to transmute from `&T` to `&mut T` without using the
5755 * The #[linkage] attribute was implemented for extern statics/functions.
5756 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
5757 * `Pod` was renamed to `Copy`.
5760 * The `libextra` library has been removed. It has now been decomposed into
5761 component libraries with smaller and more focused nuggets of
5762 functionality. The full list of libraries can be found on the
5763 documentation index page.
5764 * std: `std::condition` has been removed. All I/O errors are now propagated
5765 through the `Result` type. In order to assist with error handling, a
5766 `try!` macro for unwrapping errors with an early return and a lint for
5767 unused results has been added. See #12039 for more information.
5768 * std: The `vec` module has been renamed to `slice`.
5769 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
5770 This will become the only growable vector in the future.
5771 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
5772 are now found at `std::io::BufferedReader` instead of
5773 `std::io::buffered::BufferedReader`.
5774 * std: `print` and `println` are no longer in the prelude, the `print!` and
5775 `println!` macros are intended to be used instead.
5776 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5777 attempts to statically prevent cycles.
5778 * std: The standard distribution is adopting the policy of pushing failure
5779 to the user rather than failing in libraries. Many functions (such as
5780 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5781 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5782 deriving mode: `#[deriving(Show)]`.
5783 * std: `ToStr` is now implemented for all types implementing `Show`.
5784 * std: The formatting trait methods now take `&self` instead of `&T`
5785 * std: The `invert()` method on iterators has been renamed to `rev()`
5786 * std: `std::num` has seen a reduction in the genericity of its traits,
5787 consolidating functionality into a few core traits.
5788 * std: Backtraces are now printed on task failure if the environment
5789 variable `RUST_BACKTRACE` is present.
5790 * std: Naming conventions for iterators have been standardized. More details
5791 can be found on the wiki's style guide.
5792 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5793 still implement the function.
5794 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5795 * std: `assert_approx_eq!` has been removed
5796 * std: The `e` and `E` formatting specifiers for floats have been added to
5797 print them in exponential notation.
5798 * std: The `Times` trait has been removed
5799 * std: Indications of variance and opting out of builtin bounds is done
5800 through marker types in `std::kinds::marker` now
5801 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5802 `#[deriving(Hash)]` is now possible.
5803 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5804 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5805 * std: `Chan::new` is now `channel()`.
5806 * std: A new synchronous channel type has been implemented.
5807 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5808 * std: `hashmap` and `trie` have been moved to `libcollections`
5809 * std: `run` has been rolled into `io::process`
5810 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5811 * std: The equality and comparison traits have seen some reorganization.
5812 * std: `rand` has moved to `librand`.
5813 * std: `to_{lower,upper}case` has been implemented for `char`.
5814 * std: Logging has been moved to `liblog`.
5815 * collections: `HashMap` has been rewritten for higher performance and less
5817 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5818 it can be booted manually. The runtime guide has more information and
5820 * native: All I/O functionality except signals has been implemented.
5821 * green: Task spawning with `libgreen` has been optimized with stack caching
5822 and various trimming of code.
5823 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5824 * sync: The `extra::sync` module has been updated to modern rust (and moved
5825 to the `sync` library), tweaking and improving various interfaces while
5826 dropping redundant functionality.
5827 * sync: A new `Barrier` type has been added to the `sync` library.
5828 * sync: An efficient mutex for native and green tasks has been implemented.
5829 * serialize: The `base64` module has seen some improvement. It treats
5830 newlines better, has non-string error values, and has seen general
5832 * fourcc: A `fourcc!` macro was introduced
5833 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5834 hexadecimal literal.
5837 * `rustpkg` has been deprecated and removed from the main repository. Its
5838 replacement, `cargo`, is under development.
5839 * Nightly builds of rust are now available
5840 * The memory usage of rustc has been improved many times throughout this
5842 * The build process supports disabling rpath support for the rustc binary
5844 * Code generation has improved in some cases, giving more information to the
5845 LLVM optimization passes to enable more extensive optimizations.
5846 * Debuginfo compatibility with lldb on OSX has been restored.
5847 * The master branch is now gated on an android bot, making building for
5848 android much more reliable.
5849 * Output flags have been centralized into one `--emit` flag.
5850 * Crate type flags have been centralized into one `--crate-type` flag.
5851 * Codegen flags have been consolidated behind a `-C` flag.
5852 * Linking against outdated crates now has improved error messages.
5853 * Error messages with lifetimes will often suggest how to annotate the
5854 function to fix the error.
5855 * Many more types are documented in the standard library, and new guides
5857 * Many `rustdoc` improvements:
5858 * code blocks are syntax highlighted.
5859 * render standalone markdown files.
5860 * the --test flag tests all code blocks by default.
5861 * exported macros are displayed.
5862 * re-exported types have their documentation inlined at the location of the
5864 * search works across crates that have been rendered to the same output
5868 Version 0.9 (2014-01-09)
5869 ==========================
5871 * ~1800 changes, numerous bugfixes
5874 * The `float` type has been removed. Use `f32` or `f64` instead.
5875 * A new facility for enabling experimental features (feature gating) has
5876 been added, using the crate-level `#[feature(foo)]` attribute.
5877 * Managed boxes (@) are now behind a feature gate
5878 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5879 standard library's `Gc` or `Rc` types instead.
5880 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5881 * Jumping back to the top of a loop is now done with `continue` instead of
5883 * Strings can no longer be mutated through index assignment.
5884 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5885 hash delimiters, as in `r###"foo"###`.
5886 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5888 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5889 * `@fn`s have been removed.
5890 * `do` only works with procs in order to make it obvious what the cost
5892 * Single-element tuple-like structs can no longer be dereferenced to
5893 obtain the inner value. A more comprehensive solution for overloading
5894 the dereference operator will be provided in the future.
5895 * The `#[link(...)]` attribute has been replaced with
5896 `#[crate_id = "name#vers"]`.
5897 * Empty `impl`s must be terminated with empty braces and may not be
5898 terminated with a semicolon.
5899 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5900 no longer has any special meaning.
5901 * The old `fmt!` string formatting macro has been removed.
5902 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5903 `print!` and `println!`.
5904 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5905 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5906 `extern mod foo = "bar"` instead.
5907 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5908 * Macros can have attributes.
5909 * Macros can expand to items with attributes.
5910 * Macros can expand to multiple items.
5911 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5912 * Comments may be nested.
5913 * Values automatically coerce to trait objects they implement, without
5915 * Enum discriminants are no longer an entire word but as small as needed to
5916 contain all the variants. The `repr` attribute can be used to override
5917 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5918 `#[repr(C)]` to match C enums.
5919 * Non-string literals are not allowed in attributes (they never worked).
5920 * The FFI now supports variadic functions.
5921 * Octal numeric literals, as in `0o7777`.
5922 * The `concat!` syntax extension performs compile-time string concatenation.
5923 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5924 removed as Rust no longer uses segmented stacks.
5925 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5926 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5927 not `*`; ignoring remaining fields of a struct is also done with `..`,
5928 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5929 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5930 * `rustc` supports the "system" calling convention, which defaults to the
5931 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5933 * The `type_overflow` lint (default: warn) checks literals for overflow.
5934 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5935 * The `attribute_usage` lint (default: warn) warns about unknown
5937 * The `unknown_features` lint (default: warn) warns about unknown
5939 * The `dead_code` lint (default: warn) checks for dead code.
5940 * Rust libraries can be linked statically to one another
5941 * `#[link_args]` is behind the `link_args` feature gate.
5942 * Native libraries are now linked with `#[link(name = "foo")]`
5943 * Native libraries can be statically linked to a rust crate
5944 (`#[link(name = "foo", kind = "static")]`).
5945 * Native OS X frameworks are now officially supported
5946 (`#[link(name = "foo", kind = "framework")]`).
5947 * The `#[thread_local]` attribute creates thread-local (not task-local)
5948 variables. Currently behind the `thread_local` feature gate.
5949 * The `return` keyword may be used in closures.
5950 * Types that can be copied via a memcpy implement the `Pod` kind.
5951 * The `cfg` attribute can now be used on struct fields and enum variants.
5954 * std: The `option` and `result` API's have been overhauled to make them
5955 simpler, more consistent, and more composable.
5956 * std: The entire `std::io` module has been replaced with one that is
5957 more comprehensive and that properly interfaces with the underlying
5958 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5960 * std: `io::util` contains a number of useful implementations of
5961 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5962 `ZeroReader`, `TeeReader`.
5963 * std: The reference counted pointer type `extra::rc` moved into std.
5964 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5965 just a wrapper around it).
5966 * std: The `Either` type has been removed.
5967 * std: `fmt::Default` can be implemented for any type to provide default
5968 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5969 * std: The `rand` API continues to be tweaked.
5970 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5971 on failure in gdb, is now named `rust_fail`.
5972 * std: The `each_key` and `each_value` methods on `HashMap` have been
5973 replaced by the `keys` and `values` iterators.
5974 * std: Functions dealing with type size and alignment have moved from the
5975 `sys` module to the `mem` module.
5976 * std: The `path` module was written and API changed.
5977 * std: `str::from_utf8` has been changed to cast instead of allocate.
5978 * std: `starts_with` and `ends_with` methods added to vectors via the
5979 `ImmutableEqVector` trait, which is in the prelude.
5980 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
5981 if the index is out of bounds.
5982 * std: Task failure no longer propagates between tasks, as the model was
5983 complex, expensive, and incompatible with thread-based tasks.
5984 * std: The `Any` type can be used for dynamic typing.
5985 * std: `~Any` can be passed to the `fail!` macro and retrieved via
5987 * std: Methods that produce iterators generally do not have an `_iter`
5989 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
5990 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
5991 * std: `util::ignore` renamed to `prelude::drop`.
5992 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
5994 * std: `vec::raw` has seen a lot of cleanup and API changes.
5995 * std: The standard library no longer includes any C++ code, and very
5996 minimal C, eliminating the dependency on libstdc++.
5997 * std: Runtime scheduling and I/O functionality has been factored out into
5998 extensible interfaces and is now implemented by two different crates:
5999 libnative, for native threading and I/O; and libgreen, for green threading
6000 and I/O. This paves the way for using the standard library in more limited
6001 embedded environments.
6002 * std: The `comm` module has been rewritten to be much faster, have a
6003 simpler, more consistent API, and to work for both native and green
6005 * std: All libuv dependencies have been moved into the rustuv crate.
6006 * native: New implementations of runtime scheduling on top of OS threads.
6007 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6009 * green: The green thread scheduler and message passing types are almost
6011 * extra: The `flatpipes` module had bitrotted and was removed.
6012 * extra: All crypto functions have been removed and Rust now has a policy of
6013 not reimplementing crypto in the standard library. In the future crypto
6014 will be provided by external crates with bindings to established libraries.
6015 * extra: `c_vec` has been modernized.
6016 * extra: The `sort` module has been removed. Use the `sort` method on
6020 * The `rust` and `rusti` commands have been removed, due to lack of
6022 * `rustdoc` was completely rewritten.
6023 * `rustdoc` can test code examples in documentation.
6024 * `rustpkg` can test packages with the argument, 'test'.
6025 * `rustpkg` supports arbitrary dependencies, including C libraries.
6026 * `rustc`'s support for generating debug info is improved again.
6027 * `rustc` has better error reporting for unbalanced delimiters.
6028 * `rustc`'s JIT support was removed due to bitrot.
6029 * Executables and static libraries can be built with LTO (-Z lto)
6030 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6034 Version 0.8 (2013-09-26)
6035 ============================
6037 * ~2200 changes, numerous bugfixes
6040 * The `for` loop syntax has changed to work with the `Iterator` trait.
6041 * At long last, unwinding works on Windows.
6042 * Default methods are ready for use.
6043 * Many trait inheritance bugs fixed.
6044 * Owned and borrowed trait objects work more reliably.
6045 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6046 * rustc can omit emission of code for the `debug!` macro if it is passed
6048 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6049 for foo.rs, then foo/mod.rs, and will generate an error when both are
6051 * Strings no longer contain trailing nulls. The new `std::c_str` module
6052 provides new mechanisms for converting to C strings.
6053 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6054 * The FFI has been overhauled such that foreign functions are called directly,
6055 instead of through a stack-switching wrapper.
6056 * Calling a foreign function must be done through a Rust function with the
6057 `#[fixed_stack_segment]` attribute.
6058 * The `externfn!` macro can be used to declare both a foreign function and
6059 a `#[fixed_stack_segment]` wrapper at once.
6060 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6061 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6062 * `priv` is disallowed everywhere except for struct fields and enum variants.
6063 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6064 * `ref` bindings in irrefutable patterns work correctly now.
6065 * `char` is now prevented from containing invalid code points.
6066 * Casting to `bool` is no longer allowed.
6067 * `\0` is now accepted as an escape in chars and strings.
6068 * `yield` is a reserved keyword.
6069 * `typeof` is a reserved keyword.
6070 * Crates may be imported by URL with `extern mod foo = "url";`.
6071 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6072 * Static vectors can be initialized with repeating elements,
6073 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6074 * Static structs can be initialized with functional record update,
6075 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6076 * `cfg!` can be used to conditionally execute code based on the crate
6077 configuration, similarly to `#[cfg(...)]`.
6078 * The `unnecessary_qualification` lint detects unneeded module
6079 prefixes (default: allow).
6080 * Arithmetic operations have been implemented on the SIMD types in
6081 `std::unstable::simd`.
6082 * Exchange allocation headers were removed, reducing memory usage.
6083 * `format!` implements a completely new, extensible, and higher-performance
6084 string formatting system. It will replace `fmt!`.
6085 * `print!` and `println!` write formatted strings (using the `format!`
6086 extension) to stdout.
6087 * `write!` and `writeln!` write formatted strings (using the `format!`
6088 extension) to the new Writers in `std::rt::io`.
6089 * The library section in which a function or static is placed may
6090 be specified with `#[link_section = "..."]`.
6091 * The `proto!` syntax extension for defining bounded message protocols
6093 * `macro_rules!` is hygienic for `let` declarations.
6094 * The `#[export_name]` attribute specifies the name of a symbol.
6095 * `unreachable!` can be used to indicate unreachable code, and fails
6099 * std: Transitioned to the new runtime, written in Rust.
6100 * std: Added an experimental I/O library, `rt::io`, based on the new
6102 * std: A new generic `range` function was added to the prelude, replacing
6103 `uint::range` and friends.
6104 * std: `range_rev` no longer exists. Since range is an iterator it can be
6105 reversed with `range(lo, hi).invert()`.
6106 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6107 renamed to `unwrap_or`.
6108 * std: The `iterator` module was renamed to `iter`.
6109 * std: Integral types now support the `checked_add`, `checked_sub`, and
6110 `checked_mul` operations for detecting overflow.
6111 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6113 * std: Methods are standardizing on conventions for casting methods:
6114 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6116 * std: The `CString` type in `c_str` provides new ways to convert to and
6118 * std: `DoubleEndedIterator` can yield elements in two directions.
6119 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6121 * std: `str::from_bytes` renamed to `str::from_utf8`.
6122 * std: `pop_opt` and `shift_opt` methods added to vectors.
6123 * std: The task-local data interface no longer uses @, and keys are
6124 no longer function pointers.
6125 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6126 * std: Added `SharedPort` to `comm`.
6127 * std: `Eq` has a default method for `ne`; only `eq` is required
6129 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6130 is required in implementations.
6131 * std: `is_utf8` performance is improved, impacting many string functions.
6132 * std: `os::MemoryMap` provides cross-platform mmap.
6133 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6134 are not 'in-bounds' are considered undefined.
6135 * std: Many freestanding functions in `vec` removed in favor of methods.
6136 * std: Many freestanding functions on scalar types removed in favor of
6138 * std: Many options to task builders were removed since they don't make
6139 sense in the new scheduler design.
6140 * std: More containers implement `FromIterator` so can be created by the
6142 * std: More complete atomic types in `unstable::atomics`.
6143 * std: `comm::PortSet` removed.
6144 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6145 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6146 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6147 default implementations.
6148 * std: Various `from_str` functions were removed in favor of a generic
6149 `from_str` which is available in the prelude.
6150 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6151 * extra: `dlist`, the doubly-linked list was modernized.
6152 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6153 * extra: Added `glob` module, replacing `std::os::glob`.
6154 * extra: `rope` was removed.
6155 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6156 * extra: `net`, and `timer` were removed. The experimental replacements
6157 are `std::rt::io::net` and `std::rt::io::timer`.
6158 * extra: Iterators implemented for `SmallIntMap`.
6159 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6160 * extra: `SmallIntSet` removed. Use `BitvSet`.
6161 * extra: Performance of JSON parsing greatly improved.
6162 * extra: `semver` updated to SemVer 2.0.0.
6163 * extra: `term` handles more terminals correctly.
6164 * extra: `dbg` module removed.
6165 * extra: `par` module removed.
6166 * extra: `future` was cleaned up, with some method renames.
6167 * extra: Most free functions in `getopts` were converted to methods.
6170 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6171 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6172 similarly to gcc's `--march` flag.
6173 * rustc's performance compiling small crates is much better.
6174 * rustpkg has received many improvements.
6175 * rustpkg supports git tags as package IDs.
6176 * rustpkg builds into target-specific directories so it can be used for
6178 * The number of concurrent test tasks is controlled by the environment
6179 variable RUST_TEST_TASKS.
6180 * The test harness can now report metrics for benchmarks.
6181 * All tools have man pages.
6182 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6183 * The runtime uses jemalloc for allocations.
6184 * Segmented stacks are temporarily disabled as part of the transition to
6185 the new runtime. Stack overflows are possible!
6186 * A new documentation backend, rustdoc_ng, is available for use. It is
6187 still invoked through the normal `rustdoc` command.
6190 Version 0.7 (2013-07-03)
6191 =======================
6193 * ~2000 changes, numerous bugfixes
6196 * `impl`s no longer accept a visibility qualifier. Put them on methods
6198 * The borrow checker has been rewritten with flow-sensitivity, fixing
6199 many bugs and inconveniences.
6200 * The `self` parameter no longer implicitly means `&'self self`,
6201 and can be explicitly marked with a lifetime.
6202 * Overloadable compound operators (`+=`, etc.) have been temporarily
6203 removed due to bugs.
6204 * The `for` loop protocol now requires `for`-iterators to return `bool`
6205 so they compose better.
6206 * The `Durable` trait is replaced with the `'static` bounds.
6207 * Trait default methods work more often.
6208 * Structs with the `#[packed]` attribute have byte alignment and
6209 no padding between fields.
6210 * Type parameters bound by `Copy` must now be copied explicitly with
6212 * It is now illegal to move out of a dereferenced unsafe pointer.
6213 * `Option<~T>` is now represented as a nullable pointer.
6214 * `@mut` does dynamic borrow checks correctly.
6215 * The `main` function is only detected at the topmost level of the crate.
6216 The `#[main]` attribute is still valid anywhere.
6217 * Struct fields may no longer be mutable. Use inherited mutability.
6218 * The `#[no_send]` attribute makes a type that would otherwise be
6220 * The `#[no_freeze]` attribute makes a type that would otherwise be
6222 * Unbounded recursion will abort the process after reaching the limit
6223 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6224 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6225 are never implicitly copyable.
6226 * `#[static_assert]` makes compile-time assertions about static bools.
6227 * At long last, 'argument modes' no longer exist.
6228 * The rarely used `use mod` statement no longer exists.
6231 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6233 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6234 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6236 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6237 and unsuffixed integer literals.
6240 * The `core` crate was renamed to `std`.
6241 * The `std` crate was renamed to `extra`.
6242 * More and improved documentation.
6243 * std: `iterator` module for external iterator objects.
6244 * Many old-style (internal, higher-order function) iterators replaced by
6245 implementations of `Iterator`.
6246 * std: Many old internal vector and string iterators,
6247 incl. `any`, `all`. removed.
6248 * std: The `finalize` method of `Drop` renamed to `drop`.
6249 * std: The `drop` method now takes `&mut self` instead of `&self`.
6250 * std: The prelude no longer re-exports any modules, only types and traits.
6251 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6252 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6253 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6254 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6255 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6256 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6257 * std: Many types implement `Clone`.
6258 * std: `path` type renamed to `Path`.
6259 * std: `mut` module and `Mut` type removed.
6260 * std: Many standalone functions removed in favor of methods and iterators
6261 in `vec`, `str`. In the future methods will also work as functions.
6262 * std: `reinterpret_cast` removed. Use `transmute`.
6263 * std: ascii string handling in `std::ascii`.
6264 * std: `Rand` is implemented for ~/@.
6265 * std: `run` module for spawning processes overhauled.
6266 * std: Various atomic types added to `unstable::atomic`.
6267 * std: Various types implement `Zero`.
6268 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6269 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6270 * std: Added `os::mkdir_recursive`.
6271 * std: Added `os::glob` function performs filesystems globs.
6272 * std: `FuzzyEq` renamed to `ApproxEq`.
6273 * std: `Map` now defines `pop` and `swap` methods.
6274 * std: `Cell` constructors converted to static methods.
6275 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6276 * extra: `flate` module moved from `std` to `extra`.
6277 * extra: `fileinput` module for iterating over a series of files.
6278 * extra: `Complex` number type and `complex` module.
6279 * extra: `Rational` number type and `rational` module.
6280 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6281 * extra: `term` uses terminfo now, is more correct.
6282 * extra: `arc` functions converted to methods.
6283 * extra: Implementation of fixed output size variations of SHA-2.
6286 * `unused_variable` lint mode for unused variables (default: warn).
6287 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6289 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6291 * `dead_assignment` lint mode for unread variables (default: warn).
6292 * `unnecessary_allocation` lint mode detects some heap allocations that are
6293 immediately borrowed so could be written without allocating (default: warn).
6294 * `missing_doc` lint mode (default: allow).
6295 * `unreachable_code` lint mode (default: warn).
6296 * The `rusti` command has been rewritten and a number of bugs addressed.
6297 * rustc outputs in color on more terminals.
6298 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6299 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6300 * Compiling with `-g` will make the binary record information about
6301 dynamic borrowcheck failures for debugging.
6302 * rustdoc has a nicer stylesheet.
6303 * Various improvements to rustdoc.
6304 * Improvements to rustpkg (see the detailed release notes).
6307 Version 0.6 (2013-04-03)
6308 ========================
6310 * ~2100 changes, numerous bugfixes
6313 * The self type parameter in traits is now spelled `Self`
6314 * The `self` parameter in trait and impl methods must now be explicitly
6315 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6316 * Static methods no longer require the `static` keyword and instead
6317 are distinguished by the lack of a `self` parameter
6318 * Replaced the `Durable` trait with the `'static` lifetime
6319 * The old closure type syntax with the trailing sigil has been
6320 removed in favor of the more consistent leading sigil
6321 * `super` is a keyword, and may be prefixed to paths
6322 * Trait bounds are separated with `+` instead of whitespace
6323 * Traits are implemented with `impl Trait for Type`
6324 instead of `impl Type: Trait`
6325 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6326 * The `export` keyword has finally been removed
6327 * The `move` keyword has been removed (see "Semantic changes")
6328 * The interior mutability qualifier on vectors, `[mut T]`, has been
6329 removed. Use `&mut [T]`, etc.
6330 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6331 * `fail` is no longer a keyword. Use `fail!()`
6332 * `assert` is no longer a keyword. Use `assert!()`
6333 * `log` is no longer a keyword. use `debug!`, etc.
6334 * 1-tuples may be represented as `(T,)`
6335 * Struct fields may no longer be `mut`. Use inherited mutability,
6336 `@mut T`, `core::mut` or `core::cell`
6337 * `extern mod { ... }` is no longer valid syntax for foreign
6338 function modules. Use extern blocks: `extern { ... }`
6339 * Newtype enums removed. Use tuple-structs.
6340 * Trait implementations no longer support visibility modifiers
6341 * Pattern matching over vectors improved and expanded
6342 * `const` renamed to `static` to correspond to lifetime name,
6343 and make room for future `static mut` unsafe mutable globals.
6344 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6345 * `Clone` implementations can be automatically generated with
6346 `#[deriving(Clone)]`
6347 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6348 instead of `foo as Bar`.
6349 * Fixed length vector types are now written as `[int, .. 3]`
6350 instead of `[int * 3]`.
6351 * Fixed length vector types can express the length as a constant
6352 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6355 * Types with owned pointers or custom destructors move by default,
6356 eliminating the `move` keyword
6357 * All foreign functions are considered unsafe
6358 * &mut is now unaliasable
6359 * Writes to borrowed @mut pointers are prevented dynamically
6361 * The name of the main function can be customized using #[main]
6362 * The default type of an inferred closure is &fn instead of @fn
6363 * `use` statements may no longer be "chained" - they cannot import
6364 identifiers imported by previous `use` statements
6365 * `use` statements are crate relative, importing from the "top"
6366 of the crate by default. Paths may be prefixed with `super::`
6367 or `self::` to change the search behavior.
6368 * Method visibility is inherited from the implementation declaration
6369 * Structural records have been removed
6370 * Many more types can be used in static items, including enums
6371 'static-lifetime pointers and vectors
6372 * Pattern matching over vectors improved and expanded
6373 * Typechecking of closure types has been overhauled to
6374 improve inference and eliminate unsoundness
6375 * Macros leave scope at the end of modules, unless that module is
6376 tagged with #[macro_escape]
6379 * Added big integers to `std::bigint`
6380 * Removed `core::oldcomm` module
6381 * Added pipe-based `core::comm` module
6382 * Numeric traits have been reorganized under `core::num`
6383 * `vec::slice` finally returns a slice
6384 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6385 * Containers reorganized around traits in `core::container`
6386 * `core::dvec` removed, `~[T]` is a drop-in replacement
6387 * `core::send_map` renamed to `core::hashmap`
6388 * `std::map` removed; replaced with `core::hashmap`
6389 * `std::treemap` reimplemented as an owned balanced tree
6390 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6391 * `core::trie` added as a fast ordered map for integer keys
6392 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6393 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6394 overload the comparison operators, whereas `TotalOrd` is used
6395 by certain container types
6398 * Replaced the 'cargo' package manager with 'rustpkg'
6399 * Added all-purpose 'rust' tool
6400 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6401 * rustc now *attempts* to offer spelling suggestions
6402 * Improved support for ARM and Android
6403 * Preliminary MIPS backend
6404 * Improved foreign function ABI implementation for x86, x86_64
6405 * Various memory usage improvements
6406 * Rust code may be embedded in foreign code under limited circumstances
6407 * Inline assembler supported by new asm!() syntax extension.
6410 Version 0.5 (2012-12-21)
6411 ===========================
6413 * ~900 changes, numerous bugfixes
6416 * Removed `<-` move operator
6417 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6418 * Removed old fixed length vector syntax - `[T]/N`
6419 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6420 * Macros may now expand to items and statements
6421 * `a.b()` is always parsed as a method call, never as a field projection
6422 * `Eq` and `IterBytes` implementations can be automatically generated
6423 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6424 * Removed the special crate language for `.rc` files
6425 * Function arguments may consist of any irrefutable pattern
6428 * `&` and `~` pointers may point to objects
6429 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6430 * Enum variants may be structs
6431 * Destructors can be added to all nominal types with the Drop trait
6432 * Structs and nullary enum variants may be constants
6433 * Values that cannot be implicitly copied are now automatically moved
6434 without writing `move` explicitly
6435 * `&T` may now be coerced to `*T`
6436 * Coercions happen in `let` statements as well as function calls
6437 * `use` statements now take crate-relative paths
6438 * The module and type namespaces have been merged so that static
6439 method names can be resolved under the trait in which they are
6442 * Improved support for language features
6443 * Trait inheritance works in many scenarios
6444 * More support for explicit self arguments in methods - `self`, `&self`
6445 `@self`, and `~self` all generally work as expected
6446 * Static methods work in more situations
6447 * Experimental: Traits may declare default methods for the implementations
6451 * New condition handling system in `core::condition`
6452 * Timsort added to `std::sort`
6453 * New priority queue, `std::priority_queue`
6454 * Pipes for serializable types, `std::flatpipes'
6455 * Serialization overhauled to be trait-based
6456 * Expanded `getopts` definitions
6457 * Moved futures to `std`
6458 * More functions are pure now
6459 * `core::comm` renamed to `oldcomm`. Still deprecated
6460 * `rustdoc` and `cargo` are libraries now
6463 * Added a preliminary REPL, `rusti`
6464 * License changed from MIT to dual MIT/APL2
6467 Version 0.4 (2012-10-15)
6468 ==========================
6470 * ~2000 changes, numerous bugfixes
6473 * All keywords are now strict and may not be used as identifiers anywhere
6474 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6475 'of', 'with', 'to', 'class'.
6476 * Classes are replaced with simpler structs
6477 * Explicit method self types
6478 * `ret` became `return` and `alt` became `match`
6479 * `import` is now `use`; `use is now `extern mod`
6480 * `extern mod { ... }` is now `extern { ... }`
6481 * `use mod` is the recommended way to import modules
6482 * `pub` and `priv` replace deprecated export lists
6483 * The syntax of `match` pattern arms now uses fat arrow (=>)
6484 * `main` no longer accepts an args vector; use `os::args` instead
6487 * Trait implementations are now coherent, ala Haskell typeclasses
6488 * Trait methods may be static
6489 * Argument modes are deprecated
6490 * Borrowed pointers are much more mature and recommended for use
6491 * Strings and vectors in the static region are stored in constant memory
6492 * Typestate was removed
6493 * Resolution rewritten to be more reliable
6494 * Support for 'dual-mode' data structures (freezing and thawing)
6497 * Most binary operators can now be overloaded via the traits in
6499 * `std::net::url` for representing URLs
6500 * Sendable hash maps in `core::send_map`
6501 * `core::task' gained a (currently unsafe) task-local storage API
6504 * An efficient new intertask communication primitive called the pipe,
6505 along with a number of higher-level channel types, in `core::pipes`
6506 * `std::arc`, an atomically reference counted, immutable, shared memory
6508 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6509 * Futures are now based on pipes and sendable
6510 * More robust linked task failure
6511 * Improved task builder API
6514 * Improved error reporting
6515 * Preliminary JIT support
6516 * Preliminary work on precise GC
6517 * Extensive architectural improvements to rustc
6518 * Begun a transition away from buggy C++-based reflection (shape) code to
6519 Rust-based (visitor) code
6520 * All hash functions and tables converted to secure, randomized SipHash
6523 Version 0.3 (2012-07-12)
6524 ========================
6526 * ~1900 changes, numerous bugfixes
6528 * New coding conveniences
6529 * Integer-literal suffix inference
6530 * Per-item control over warnings, errors
6531 * #[cfg(windows)] and #[cfg(unix)] attributes
6532 * Documentation comments
6533 * More compact closure syntax
6534 * 'do' expressions for treating higher-order functions as
6536 * *-patterns (wildcard extended to all constructor fields)
6539 * Name resolution pass and exhaustiveness checker rewritten
6540 * Region pointers and borrow checking supersede alias
6542 * Init-ness checking is now provided by a region-based liveness
6543 pass instead of the typestate pass; same for last-use analysis
6544 * Extensive work on region pointers
6546 * Experimental new language features
6547 * Slices and fixed-size, interior-allocated vectors
6548 * #!-comments for lang versioning, shell execution
6549 * Destructors and iface implementation for classes;
6550 type-parameterized classes and class methods
6551 * 'const' type kind for types that can be used to implement
6552 shared-memory concurrency patterns
6556 * Removal of various obsolete features
6557 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6558 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6560 * Constructs: do-while loops ('do' repurposed), fn binding,
6561 resources (replaced by destructors)
6563 * Compiler reorganization
6564 * Syntax-layer of compiler split into separate crate
6565 * Clang (from LLVM project) integrated into build
6566 * Typechecker split into sub-modules
6569 * New time functions
6570 * Extension methods for many built-in types
6571 * Arc: atomic-refcount read-only / exclusive-use shared cells
6572 * Par: parallel map and search routines
6573 * Extensive work on libuv interface
6574 * Much vector code moved to libraries
6575 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6576 #include, #include_str, #include_bin
6579 * Cargo automatically resolves dependencies
6582 Version 0.2 (2012-03-29)
6583 =========================
6585 * >1500 changes, numerous bugfixes
6587 * New docs and doc tooling
6589 * New port: FreeBSD x86_64
6591 * Compilation model enhancements
6592 * Generics now specialized, multiply instantiated
6593 * Functions now inlined across separate crates
6595 * Scheduling, stack and threading fixes
6596 * Noticeably improved message-passing performance
6597 * Explicit schedulers
6601 * Experimental new language features
6602 * Operator overloading
6606 * Various language extensions
6607 * C-callback function types: 'crust fn ...'
6608 * Infinite-loop construct: 'loop { ... }'
6609 * Shorten 'mutable' to 'mut'
6610 * Required mutable-local qualifier: 'let mut ...'
6611 * Basic glob-exporting: 'export foo::*;'
6612 * Alt now exhaustive, 'alt check' for runtime-checked
6613 * Block-function form of 'for' loop, with 'break' and 'ret'.
6616 * AST quasi-quote syntax extension
6617 * Revived libuv interface
6618 * New modules: core::{future, iter}, std::arena
6619 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6620 * Extensive cleanup, regularization in libstd, libcore
6623 Version 0.1 (2012-01-20)
6624 ===============================
6626 * Most language features work, including:
6627 * Unique pointers, unique closures, move semantics
6628 * Interface-constrained generics
6629 * Static interface dispatch
6631 * Multithread task scheduling
6632 * Typestate predicates
6633 * Failure unwinding, destructors
6634 * Pattern matching and destructuring assignment
6635 * Lightweight block-lambda syntax
6636 * Preliminary macro-by-example
6638 * Compiler works with the following configurations:
6639 * Linux: x86 and x86_64 hosts and targets
6640 * macOS: x86 and x86_64 hosts and targets
6641 * Windows: x86 hosts and targets
6643 * Cross compilation / multi-target configuration supported.
6645 * Preliminary API-documentation and package-management tools included.
6649 * Documentation is incomplete.
6651 * Performance is below intended target.
6653 * Standard library APIs are subject to extensive change, reorganization.
6655 * Language-level versioning is not yet operational - future code will