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
144 Version 1.27.0 (2018-06-21)
145 ==========================
149 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
150 be used as an identifer.
151 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
152 bare `Trait` syntax, and should make it clearer when being used in tandem with
153 `impl Trait`. Since it is equivalent to the following syntax:
154 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
155 `Box<Trait> == Box<dyn Trait>`.
156 - [Attributes on generic parameters such as types and lifetimes are
157 now stable.][48851] e.g.
158 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
159 - [The `#[must_use]` attribute can now also be used on functions as well as
160 types.][48925] It provides a lint that by default warns users when the
161 value returned by a function has not been used.
165 - [Added the `armv5te-unknown-linux-musl` target.][50423]
169 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
170 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
171 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
172 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
174 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
175 std are now available in core.][49896]
176 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
178 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
179 that the operation isn't done in place.
180 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
181 the `#[must_use]` attribute][49533] to warn about unused potentially
182 expensive allocations.
186 - [`DoubleEndedIterator::rfind`]
187 - [`DoubleEndedIterator::rfold`]
188 - [`DoubleEndedIterator::try_rfold`]
189 - [`Duration::from_micros`]
190 - [`Duration::from_nanos`]
191 - [`Duration::subsec_micros`]
192 - [`Duration::subsec_millis`]
193 - [`HashMap::remove_entry`]
194 - [`Iterator::try_fold`]
195 - [`Iterator::try_for_each`]
198 - [`String::replace_range`]
199 - [`Take::set_limit`]
200 - [`hint::unreachable_unchecked`]
201 - [`os::unix::process::parent_id`]
202 - [`ptr::swap_nonoverlapping`]
203 - [`slice::rsplit_mut`]
205 - [`slice::swap_with_slice`]
209 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
210 `readme`, and `repository` fields.][cargo/5386]
211 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
212 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
213 a different directory than `target` for placing compilation artifacts.
214 - [Cargo will be adding automatic target inference for binaries, benchmarks,
215 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
216 specific targets e.g. using `[[bin]]` and have other binaries in locations
217 where cargo would infer a binary, Cargo will produce a warning. You can
218 disable this feature ahead of time by setting any of the following `autobins`,
219 `autobenches`, `autoexamples`, `autotests` to false.
220 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
221 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
225 - [Added “The Rustc book” into the official documentation.][49707]
226 [“The Rustc book”] documents and teaches how to use the rustc compiler.
227 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
231 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
232 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
233 compile, `"".is_empty()` will still compile.
234 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
235 will only print the inner type.][48553] e.g.
236 `print!("{:?}", AtomicBool::new(true))` will print `true`
237 not `AtomicBool(true)`.
238 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
239 could enter higher numbers but they were not supported by LLVM. Up to 512MB
240 alignment should cover all use cases.
242 [48553]: https://github.com/rust-lang/rust/pull/48553/
243 [48851]: https://github.com/rust-lang/rust/pull/48851/
244 [48925]: https://github.com/rust-lang/rust/pull/48925/
245 [49533]: https://github.com/rust-lang/rust/pull/49533/
246 [49623]: https://github.com/rust-lang/rust/pull/49623/
247 [49630]: https://github.com/rust-lang/rust/pull/49630/
248 [49664]: https://github.com/rust-lang/rust/pull/49664/
249 [49699]: https://github.com/rust-lang/rust/pull/49699/
250 [49707]: https://github.com/rust-lang/rust/pull/49707/
251 [49719]: https://github.com/rust-lang/rust/pull/49719/
252 [49896]: https://github.com/rust-lang/rust/pull/49896/
253 [49968]: https://github.com/rust-lang/rust/pull/49968/
254 [50177]: https://github.com/rust-lang/rust/pull/50177/
255 [50378]: https://github.com/rust-lang/rust/pull/50378/
256 [50398]: https://github.com/rust-lang/rust/pull/50398/
257 [50423]: https://github.com/rust-lang/rust/pull/50423/
258 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
259 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
260 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
261 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
262 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
263 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
264 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
265 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
266 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
267 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
268 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
269 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
270 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
271 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
272 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
273 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
274 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
275 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
276 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
277 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
278 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
279 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
280 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
281 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
282 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
283 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
284 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
285 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
286 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
287 [“The Rustc book”]: https://doc.rust-lang.org/rustc
290 Version 1.26.2 (2018-06-05)
291 ==========================
296 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics][51117]
298 [51117]: https://github.com/rust-lang/rust/issues/51117
301 Version 1.26.1 (2018-05-29)
302 ==========================
307 - [RLS now works on Windows][50646]
308 - [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
314 - [`fn main() -> impl Trait` no longer works for non-Termination
316 This reverts an accidental stabilization.
317 - [`NaN > NaN` no longer returns true in const-fn contexts][50812]
318 - [Prohibit using turbofish for `impl Trait` in method arguments][50950]
320 [50646]: https://github.com/rust-lang/rust/issues/50646
321 [50656]: https://github.com/rust-lang/rust/pull/50656
322 [50812]: https://github.com/rust-lang/rust/pull/50812
323 [50950]: https://github.com/rust-lang/rust/issues/50950
324 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
326 Version 1.26.0 (2018-05-10)
327 ==========================
331 - [Closures now implement `Copy` and/or `Clone` if all captured variables
332 implement either or both traits.][49299]
333 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
334 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere where a
335 lifetime can be elided.][49458]
336 - [`impl Trait` is now stable allowing you to have abstract types in returns
337 or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
338 `fn open(path: impl AsRef<Path>)`.
339 - [Pattern matching will now automatically apply dereferences.][49394]
340 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
341 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
342 - [A lot of operations are now available in a const context.][46882] E.g. You
343 can now index into constant arrays, reference and dereference into constants,
344 and use Tuple struct constructors.
345 - [Fixed entry slice patterns are now stable.][48516] e.g.
347 let points = [1, 2, 3, 4];
349 [1, 2, 3, 4] => println!("All points were sequential."),
350 _ => println!("Not all points were sequential."),
357 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
358 - [Fixed exponential projection complexity on nested types.][48296]
359 This can provide up to a ~12% reduction in compile times for certain crates.
360 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
361 to remap path prefixes outputted by the compiler.
362 - [Added `powerpc-unknown-netbsd` target.][48281]
366 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
367 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
368 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
369 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
370 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
371 - [`ascii::escape_default` is now available in libcore.][48735]
372 - [Trailing commas are now supported in std and core macros.][48056]
373 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
374 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
379 - [`*const T::copy_to_nonoverlapping`]
380 - [`*const T::copy_to`]
381 - [`*const T::read_unaligned`]
382 - [`*const T::read_volatile`]
385 - [`*const T::wrapping_add`]
386 - [`*const T::wrapping_sub`]
388 - [`*mut T::copy_to_nonoverlapping`]
389 - [`*mut T::copy_to`]
390 - [`*mut T::read_unaligned`]
391 - [`*mut T::read_volatile`]
393 - [`*mut T::replace`]
396 - [`*mut T::wrapping_add`]
397 - [`*mut T::wrapping_sub`]
398 - [`*mut T::write_bytes`]
399 - [`*mut T::write_unaligned`]
400 - [`*mut T::write_volatile`]
403 - [`FromUtf8Error::as_bytes`]
404 - [`LocalKey::try_with`]
406 - [`btree_map::Entry::and_modify`]
407 - [`fs::read_to_string`]
410 - [`hash_map::Entry::and_modify`]
411 - [`iter::FusedIterator`]
412 - [`ops::RangeInclusive`]
413 - [`ops::RangeToInclusive`]
415 - [`slice::rotate_left`]
416 - [`slice::rotate_right`]
422 - [Cargo will now output path to custom commands when `-v` is
423 passed with `--list`][cargo/5041]
424 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
428 - [The second edition of "The Rust Programming Language" book is now recommended
429 over the first.][48404]
434 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
435 syntax is now invalid.
437 use std::ops::Fn as dyn;
438 fn g(_: Box<dyn(std::fmt::Debug)>) {}
440 - [The result of dereferences are no longer promoted to `'static`.][47408]
444 const PAIR: &(i32, i32) = &(0, 1);
445 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
448 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
449 - [`".e0"` will now no longer parse as `0.0` and will instead cause
451 - [Removed hoedown from rustdoc.][48274]
452 - [Bounds on higher-kinded lifetimes a hard error.][48326]
454 [46882]: https://github.com/rust-lang/rust/pull/46882
455 [47379]: https://github.com/rust-lang/rust/pull/47379
456 [47408]: https://github.com/rust-lang/rust/pull/47408
457 [47813]: https://github.com/rust-lang/rust/pull/47813
458 [48056]: https://github.com/rust-lang/rust/pull/48056
459 [48125]: https://github.com/rust-lang/rust/pull/48125
460 [48166]: https://github.com/rust-lang/rust/pull/48166
461 [48235]: https://github.com/rust-lang/rust/pull/48235
462 [48274]: https://github.com/rust-lang/rust/pull/48274
463 [48281]: https://github.com/rust-lang/rust/pull/48281
464 [48296]: https://github.com/rust-lang/rust/pull/48296
465 [48326]: https://github.com/rust-lang/rust/pull/48326
466 [48359]: https://github.com/rust-lang/rust/pull/48359
467 [48404]: https://github.com/rust-lang/rust/pull/48404
468 [48481]: https://github.com/rust-lang/rust/pull/48481
469 [48516]: https://github.com/rust-lang/rust/pull/48516
470 [48628]: https://github.com/rust-lang/rust/pull/48628
471 [48629]: https://github.com/rust-lang/rust/pull/48629
472 [48657]: https://github.com/rust-lang/rust/pull/48657
473 [48735]: https://github.com/rust-lang/rust/pull/48735
474 [48978]: https://github.com/rust-lang/rust/pull/48978
475 [49101]: https://github.com/rust-lang/rust/pull/49101
476 [49109]: https://github.com/rust-lang/rust/pull/49109
477 [49121]: https://github.com/rust-lang/rust/pull/49121
478 [49162]: https://github.com/rust-lang/rust/pull/49162
479 [49184]: https://github.com/rust-lang/rust/pull/49184
480 [49234]: https://github.com/rust-lang/rust/pull/49234
481 [49255]: https://github.com/rust-lang/rust/pull/49255
482 [49299]: https://github.com/rust-lang/rust/pull/49299
483 [49305]: https://github.com/rust-lang/rust/pull/49305
484 [49394]: https://github.com/rust-lang/rust/pull/49394
485 [49458]: https://github.com/rust-lang/rust/pull/49458
486 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
487 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
488 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
489 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
490 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
491 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
492 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
493 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
494 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
495 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
496 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
497 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
498 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
499 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
500 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
501 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
502 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
503 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
504 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
505 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
506 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
507 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
508 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
509 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
510 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
511 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
512 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
513 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
514 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
515 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
516 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
517 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
518 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
519 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
520 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
521 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
522 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
523 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
524 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
525 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
526 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
527 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
530 Version 1.25.0 (2018-03-29)
531 ==========================
535 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
536 - [You can now use nested groups of imports.][47948]
537 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
538 - [You can now have `|` at the start of a match arm.][47947] e.g.
546 | Foo::B => println!("AB"),
547 | Foo::C => println!("C"),
554 - [Upgraded to LLVM 6.][47828]
555 - [Added `-C lto=val` option.][47521]
556 - [Added `i586-unknown-linux-musl` target][47282]
560 - [Impl Send for `process::Command` on Unix.][47760]
561 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
562 - [`UnsafeCell::into_inner` is now safe.][47204]
563 - [Implement libstd for CloudABI.][47268]
564 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
565 - [Implement `AsRef<Path>` for Component][46985]
566 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
567 - [Moved `Duration` to libcore.][46666]
571 - [`Location::column`]
574 The following functions can now be used in a constant expression.
575 eg. `static MINUTE: Duration = Duration::from_secs(60);`
576 - [`Duration::new`][47300]
577 - [`Duration::from_secs`][47300]
578 - [`Duration::from_millis`][47300]
582 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
583 - [`cargo new` now defaults to creating a binary crate, instead of a
584 library crate.][cargo/5029]
588 - [Rust by example is now shipped with new releases][46196]
592 - [Deprecated `net::lookup_host`.][47510]
593 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
594 - The borrow checker was sometimes incorrectly permitting overlapping borrows
595 around indexing operations (see [#47349][47349]). This has been fixed (which also
596 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
597 - [Removed deprecated unstable attribute `#[simd]`.][47251]
599 [33903]: https://github.com/rust-lang/rust/pull/33903
600 [47947]: https://github.com/rust-lang/rust/pull/47947
601 [47948]: https://github.com/rust-lang/rust/pull/47948
602 [47760]: https://github.com/rust-lang/rust/pull/47760
603 [47790]: https://github.com/rust-lang/rust/pull/47790
604 [47828]: https://github.com/rust-lang/rust/pull/47828
605 [47398]: https://github.com/rust-lang/rust/pull/47398
606 [47510]: https://github.com/rust-lang/rust/pull/47510
607 [47521]: https://github.com/rust-lang/rust/pull/47521
608 [47204]: https://github.com/rust-lang/rust/pull/47204
609 [47251]: https://github.com/rust-lang/rust/pull/47251
610 [47268]: https://github.com/rust-lang/rust/pull/47268
611 [47282]: https://github.com/rust-lang/rust/pull/47282
612 [47300]: https://github.com/rust-lang/rust/pull/47300
613 [47349]: https://github.com/rust-lang/rust/pull/47349
614 [46931]: https://github.com/rust-lang/rust/pull/46931
615 [46985]: https://github.com/rust-lang/rust/pull/46985
616 [47006]: https://github.com/rust-lang/rust/pull/47006
617 [46830]: https://github.com/rust-lang/rust/pull/46830
618 [46095]: https://github.com/rust-lang/rust/pull/46095
619 [46666]: https://github.com/rust-lang/rust/pull/46666
620 [46196]: https://github.com/rust-lang/rust/pull/46196
621 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
622 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
623 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
624 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
625 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
628 Version 1.24.1 (2018-03-01)
629 ==========================
631 - [Do not abort when unwinding through FFI][48251]
632 - [Emit UTF-16 files for linker arguments on Windows][48318]
633 - [Make the error index generator work again][48308]
634 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
636 [48251]: https://github.com/rust-lang/rust/issues/48251
637 [48308]: https://github.com/rust-lang/rust/issues/48308
638 [48318]: https://github.com/rust-lang/rust/issues/48318
639 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
642 Version 1.24.0 (2018-02-15)
643 ==========================
647 - [External `sysv64` ffi is now available.][46528]
648 eg. `extern "sysv64" fn foo () {}`
652 - [rustc now uses 16 codegen units by default for release builds.][46910]
653 For the fastest builds, utilize `codegen-units=1`.
654 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
655 - [Add `aarch64-unknown-openbsd` support][46760]
659 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
660 improvement in performance in the majority of cases.
661 - [`OsStr`'s `Debug` implementation is now lossless and consistent
662 with Windows.][46798]
663 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
664 - [impl `From<bool>` for `AtomicBool`][46293]
665 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
666 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
667 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
668 - [float::from_bits now just uses transmute.][46012] This provides
669 some optimisations from LLVM.
670 - [Copied `AsciiExt` methods onto `char`][46077]
671 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
672 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
673 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
674 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
678 - [`RefCell::replace`]
680 - [`atomic::spin_loop_hint`]
682 The following functions can now be used in a constant expression.
683 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
685 - [`AtomicBool::new`][46287]
686 - [`AtomicUsize::new`][46287]
687 - [`AtomicIsize::new`][46287]
688 - [`AtomicPtr::new`][46287]
689 - [`Cell::new`][46287]
690 - [`{integer}::min_value`][46287]
691 - [`{integer}::max_value`][46287]
692 - [`mem::size_of`][46287]
693 - [`mem::align_of`][46287]
694 - [`ptr::null`][46287]
695 - [`ptr::null_mut`][46287]
696 - [`RefCell::new`][46287]
697 - [`UnsafeCell::new`][46287]
701 - [Added a `workspace.default-members` config that
702 overrides implied `--all` in virtual workspaces.][cargo/4743]
703 - [Enable incremental by default on development builds.][cargo/4817] Also added
704 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
705 per-project or global basis respectively.
712 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
713 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
714 in accordance with IETF RFC 4291 §2.2.
715 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
716 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
717 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
718 - [Leading zeros in tuple struct members is now an error][47084]
719 - [`column!()` macro is one-based instead of zero-based][46977]
720 - [`fmt::Arguments` can no longer be shared across threads][45198]
721 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
722 - [Cargo sets a different working directory for the compiler][cargo/4788]
724 [44884]: https://github.com/rust-lang/rust/pull/44884
725 [45198]: https://github.com/rust-lang/rust/pull/45198
726 [45506]: https://github.com/rust-lang/rust/pull/45506
727 [45904]: https://github.com/rust-lang/rust/pull/45904
728 [45990]: https://github.com/rust-lang/rust/pull/45990
729 [46012]: https://github.com/rust-lang/rust/pull/46012
730 [46077]: https://github.com/rust-lang/rust/pull/46077
731 [46094]: https://github.com/rust-lang/rust/pull/46094
732 [46284]: https://github.com/rust-lang/rust/pull/46284
733 [46287]: https://github.com/rust-lang/rust/pull/46287
734 [46293]: https://github.com/rust-lang/rust/pull/46293
735 [46528]: https://github.com/rust-lang/rust/pull/46528
736 [46671]: https://github.com/rust-lang/rust/pull/46671
737 [46713]: https://github.com/rust-lang/rust/pull/46713
738 [46735]: https://github.com/rust-lang/rust/pull/46735
739 [46749]: https://github.com/rust-lang/rust/pull/46749
740 [46760]: https://github.com/rust-lang/rust/pull/46760
741 [46798]: https://github.com/rust-lang/rust/pull/46798
742 [46828]: https://github.com/rust-lang/rust/pull/46828
743 [46831]: https://github.com/rust-lang/rust/pull/46831
744 [46833]: https://github.com/rust-lang/rust/pull/46833
745 [46910]: https://github.com/rust-lang/rust/pull/46910
746 [46977]: https://github.com/rust-lang/rust/pull/46977
747 [47018]: https://github.com/rust-lang/rust/pull/47018
748 [47080]: https://github.com/rust-lang/rust/pull/47080
749 [47084]: https://github.com/rust-lang/rust/pull/47084
750 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
751 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
752 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
753 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
754 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
755 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
758 Version 1.23.0 (2018-01-04)
759 ==========================
763 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
764 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
765 Which should fix some confusing errors in some operations.
769 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
770 undefined behaviour.][45920]
771 - [rustc now suggests renaming import if names clash.][45660]
772 - [Display errors/warnings correctly when there are zero-width or
773 wide characters.][45711]
774 - [rustc now avoids unnecessary copies of arguments that are
775 simple bindings][45380] This should improve memory usage on average by 5-10%.
776 - [Updated musl used to build musl rustc to 1.1.17][45393]
780 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
781 - [Implement Hash for raw pointers to unsized types][45483]
782 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
783 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
784 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
785 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
786 and `<*mut T>::as_mut`][44932]
787 - [Optimized `Thread::{park, unpark}` implementation][45524]
788 - [Improved `SliceExt::binary_search` performance.][45333]
789 - [impl `FromIterator<()>` for `()`][45379]
790 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
798 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
799 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
800 - [Added unit test checking to `cargo check`][cargo/4592]
801 - [Cargo now lets you install a specific version
802 using `cargo install --version`][cargo/4637]
806 - [Releases now ship with the Cargo book documentation.][45692]
807 - [rustdoc now prints rendering warnings on every run.][45324]
811 - [Changes have been made to type equality to make it more correct,
812 in rare cases this could break some code.][45853] [Tracking issue for
813 further information][45852]
814 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
815 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
816 Android 9, the minimum supported version is Android 14.
817 - [Bumped the minimum LLVM to 3.9][45326]
819 [44042]: https://github.com/rust-lang/rust/pull/44042
820 [44932]: https://github.com/rust-lang/rust/pull/44932
821 [45267]: https://github.com/rust-lang/rust/pull/45267
822 [45324]: https://github.com/rust-lang/rust/pull/45324
823 [45326]: https://github.com/rust-lang/rust/pull/45326
824 [45333]: https://github.com/rust-lang/rust/pull/45333
825 [45379]: https://github.com/rust-lang/rust/pull/45379
826 [45380]: https://github.com/rust-lang/rust/pull/45380
827 [45393]: https://github.com/rust-lang/rust/pull/45393
828 [45435]: https://github.com/rust-lang/rust/pull/45435
829 [45483]: https://github.com/rust-lang/rust/pull/45483
830 [45524]: https://github.com/rust-lang/rust/pull/45524
831 [45571]: https://github.com/rust-lang/rust/pull/45571
832 [45580]: https://github.com/rust-lang/rust/pull/45580
833 [45610]: https://github.com/rust-lang/rust/pull/45610
834 [45660]: https://github.com/rust-lang/rust/pull/45660
835 [45692]: https://github.com/rust-lang/rust/pull/45692
836 [45711]: https://github.com/rust-lang/rust/pull/45711
837 [45772]: https://github.com/rust-lang/rust/pull/45772
838 [45852]: https://github.com/rust-lang/rust/issues/45852
839 [45853]: https://github.com/rust-lang/rust/pull/45853
840 [45887]: https://github.com/rust-lang/rust/pull/45887
841 [45920]: https://github.com/rust-lang/rust/pull/45920
842 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
843 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
844 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
847 Version 1.22.1 (2017-11-22)
848 ==========================
850 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
852 [46183]: https://github.com/rust-lang/rust/pull/46183
854 Version 1.22.0 (2017-11-22)
855 ==========================
859 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
860 - [Now accepts underscores in unicode escapes][43716]
861 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
862 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
866 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
867 - [rustc will no longer inline in codegen units when compiling for debug][45075]
868 This should decrease compile times for debug builds.
869 - [strict memory alignment now enabled on ARMv6][45094]
870 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
874 - [Allow atomic operations up to 32 bits
875 on `armv5te_unknown_linux_gnueabi`][44978]
876 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
877 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
878 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
879 - [Properly detect overflow in `Instant += Duration`.][44220]
880 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
881 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
882 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
889 - [Cargo will now build multi file examples in subdirectories of the `examples`
890 folder that have a `main.rs` file.][cargo/4496]
891 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
892 the old format will continue to work and can be updated with `cargo update`.
893 - [Now supports vendoring git repositories][cargo/3992]
897 - [`libbacktrace` is now available on Apple platforms.][44251]
898 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
899 This now lets you specify that a given code example will fail to compile.
903 - [The minimum Android version that rustc can build for has been bumped
904 to `4.0` from `2.3`][45656]
905 - [Allowing `T op= &T` for numeric types has broken some type
906 inference cases][45480]
909 [42526]: https://github.com/rust-lang/rust/pull/42526
910 [43017]: https://github.com/rust-lang/rust/pull/43017
911 [43716]: https://github.com/rust-lang/rust/pull/43716
912 [43949]: https://github.com/rust-lang/rust/pull/43949
913 [44015]: https://github.com/rust-lang/rust/pull/44015
914 [44220]: https://github.com/rust-lang/rust/pull/44220
915 [44251]: https://github.com/rust-lang/rust/pull/44251
916 [44287]: https://github.com/rust-lang/rust/pull/44287
917 [44303]: https://github.com/rust-lang/rust/pull/44303
918 [44456]: https://github.com/rust-lang/rust/pull/44456
919 [44466]: https://github.com/rust-lang/rust/pull/44466
920 [44895]: https://github.com/rust-lang/rust/pull/44895
921 [44966]: https://github.com/rust-lang/rust/pull/44966
922 [44978]: https://github.com/rust-lang/rust/pull/44978
923 [45041]: https://github.com/rust-lang/rust/pull/45041
924 [45064]: https://github.com/rust-lang/rust/pull/45064
925 [45075]: https://github.com/rust-lang/rust/pull/45075
926 [45094]: https://github.com/rust-lang/rust/pull/45094
927 [45095]: https://github.com/rust-lang/rust/pull/45095
928 [45480]: https://github.com/rust-lang/rust/issues/45480
929 [45656]: https://github.com/rust-lang/rust/pull/45656
930 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
931 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
932 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
939 Version 1.21.0 (2017-10-12)
940 ==========================
944 - [You can now use static references for literals.][43838]
948 let x: &'static u32 = &0;
951 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
954 my_macro!(Vec<i32>::new); // Always worked
955 my_macro!(Vec::<i32>::new); // Now works
960 - [Upgraded jemalloc to 4.5.0][43911]
961 - [Enabled unwinding panics on Redox][43917]
962 - [Now runs LLVM in parallel during translation phase.][43506]
963 This should reduce peak memory usage.
967 - [Generate builtin impls for `Clone` for all arrays and tuples that
968 are `T: Clone`][43690]
969 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
970 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
971 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
976 [`std::mem::discriminant`]
980 - [You can now call `cargo install` with multiple package names][cargo/4216]
981 - [Cargo commands inside a virtual workspace will now implicitly
982 pass `--all`][cargo/4335]
983 - [Added a `[patch]` section to `Cargo.toml` to handle
984 prepublication dependencies][cargo/4123] [RFC 1969]
985 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
986 like patterns][cargo/4270]
987 - [Added the `--all-targets` option][cargo/4400]
988 - [Using required dependencies as a feature is now deprecated and emits
989 a warning][cargo/4364]
994 - [Cargo docs are moving][43916]
995 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
996 - [The rustdoc book is now available][43863]
997 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
998 - [Added a preview of RLS has been made available through rustup][44204]
999 Install with `rustup component add rls-preview`
1000 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1001 Previously only showed `std::os::unix`.
1005 - [Changes in method matching against higher-ranked types][43880] This may cause
1006 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1007 - [rustc's JSON error output's byte position start at top of file.][42973]
1008 Was previously relative to the rustc's internal `CodeMap` struct which
1009 required the unstable library `libsyntax` to correctly use.
1010 - [`unused_results` lint no longer ignores booleans][43728]
1012 [42565]: https://github.com/rust-lang/rust/pull/42565
1013 [42973]: https://github.com/rust-lang/rust/pull/42973
1014 [43348]: https://github.com/rust-lang/rust/pull/43348
1015 [43459]: https://github.com/rust-lang/rust/pull/43459
1016 [43506]: https://github.com/rust-lang/rust/pull/43506
1017 [43540]: https://github.com/rust-lang/rust/pull/43540
1018 [43690]: https://github.com/rust-lang/rust/pull/43690
1019 [43728]: https://github.com/rust-lang/rust/pull/43728
1020 [43838]: https://github.com/rust-lang/rust/pull/43838
1021 [43863]: https://github.com/rust-lang/rust/pull/43863
1022 [43880]: https://github.com/rust-lang/rust/pull/43880
1023 [43911]: https://github.com/rust-lang/rust/pull/43911
1024 [43916]: https://github.com/rust-lang/rust/pull/43916
1025 [43917]: https://github.com/rust-lang/rust/pull/43917
1026 [44204]: https://github.com/rust-lang/rust/pull/44204
1027 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1028 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1029 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1030 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1031 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1032 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1033 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1034 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1035 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1037 Version 1.20.0 (2017-08-31)
1038 ===========================
1042 - [Associated constants are now stabilised.][42809]
1043 - [A lot of macro bugs are now fixed.][42913]
1048 - [Struct fields are now properly coerced to the expected field type.][42807]
1049 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1050 `wasm32-experimental-emscripten` target.
1051 - [Changed some of the error messages to be more helpful.][42033]
1052 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1054 - [rustc now reports the total number of errors on compilation failure][43015]
1055 previously this was only the number of errors in the pass that failed.
1056 - [Expansion in rustc has been sped up 29x.][42533]
1057 - [added `msp430-none-elf` target.][43099]
1058 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1060 - [Fixes backtraces on Redox][43228]
1061 - [rustc now identifies different versions of same crate when absolute paths of
1062 different types match in an error message.][42826]
1068 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1069 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1071 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1072 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1073 - [Impl `Clone` for `DefaultHasher`.][42799]
1074 - [Impl `Sync` for `SyncSender`.][42397]
1075 - [Impl `FromStr` for `char`][42271]
1076 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1078 - [allow messages in the `unimplemented!()` macro.][42155]
1079 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1080 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1081 - [Upgrade to Unicode 10.0.0][42999]
1082 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1083 - [Skip the main thread's manual stack guard on Linux][43072]
1084 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1085 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1087 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1092 - [`CStr::into_c_string`]
1093 - [`CString::as_c_str`]
1094 - [`CString::into_boxed_c_str`]
1095 - [`Chain::get_mut`]
1096 - [`Chain::get_ref`]
1097 - [`Chain::into_inner`]
1098 - [`Option::get_or_insert_with`]
1099 - [`Option::get_or_insert`]
1100 - [`OsStr::into_os_string`]
1101 - [`OsString::into_boxed_os_str`]
1104 - [`Utf8Error::error_len`]
1105 - [`char::EscapeDebug`]
1106 - [`char::escape_debug`]
1107 - [`compile_error!`]
1108 - [`f32::from_bits`]
1110 - [`f64::from_bits`]
1112 - [`mem::ManuallyDrop`]
1113 - [`slice::sort_unstable_by_key`]
1114 - [`slice::sort_unstable_by`]
1115 - [`slice::sort_unstable`]
1116 - [`str::from_boxed_utf8_unchecked`]
1117 - [`str::as_bytes_mut`]
1118 - [`str::as_bytes_mut`]
1119 - [`str::from_utf8_mut`]
1120 - [`str::from_utf8_unchecked_mut`]
1122 - [`str::get_unchecked_mut`]
1123 - [`str::get_unchecked`]
1125 - [`str::into_boxed_bytes`]
1130 - [Cargo API token location moved from `~/.cargo/config` to
1131 `~/.cargo/credentials`.][cargo/3978]
1132 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1133 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1134 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1135 - [You can now specify version of a binary when installed through
1136 `cargo install` using `--vers`.][cargo/4229]
1137 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1138 failure.][cargo/4248]
1139 - [Changed the convention around which file is the crate root.][cargo/4259]
1140 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1141 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1146 - [Functions with `'static` in their return types will now not be as usable as
1147 if they were using lifetime parameters instead.][42417]
1148 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1149 takes the sign of NaN into account where previously didn't.][42430]
1151 [42033]: https://github.com/rust-lang/rust/pull/42033
1152 [42155]: https://github.com/rust-lang/rust/pull/42155
1153 [42271]: https://github.com/rust-lang/rust/pull/42271
1154 [42397]: https://github.com/rust-lang/rust/pull/42397
1155 [42417]: https://github.com/rust-lang/rust/pull/42417
1156 [42430]: https://github.com/rust-lang/rust/pull/42430
1157 [42431]: https://github.com/rust-lang/rust/pull/42431
1158 [42533]: https://github.com/rust-lang/rust/pull/42533
1159 [42571]: https://github.com/rust-lang/rust/pull/42571
1160 [42613]: https://github.com/rust-lang/rust/pull/42613
1161 [42799]: https://github.com/rust-lang/rust/pull/42799
1162 [42807]: https://github.com/rust-lang/rust/pull/42807
1163 [42809]: https://github.com/rust-lang/rust/pull/42809
1164 [42822]: https://github.com/rust-lang/rust/pull/42822
1165 [42826]: https://github.com/rust-lang/rust/pull/42826
1166 [42854]: https://github.com/rust-lang/rust/pull/42854
1167 [42913]: https://github.com/rust-lang/rust/pull/42913
1168 [42999]: https://github.com/rust-lang/rust/pull/42999
1169 [43011]: https://github.com/rust-lang/rust/pull/43011
1170 [43015]: https://github.com/rust-lang/rust/pull/43015
1171 [43072]: https://github.com/rust-lang/rust/pull/43072
1172 [43077]: https://github.com/rust-lang/rust/pull/43077
1173 [43097]: https://github.com/rust-lang/rust/pull/43097
1174 [43099]: https://github.com/rust-lang/rust/pull/43099
1175 [43170]: https://github.com/rust-lang/rust/pull/43170
1176 [43178]: https://github.com/rust-lang/rust/pull/43178
1177 [43185]: https://github.com/rust-lang/rust/pull/43185
1178 [43228]: https://github.com/rust-lang/rust/pull/43228
1179 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1180 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1181 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1182 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1183 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1184 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1185 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1186 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1187 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1188 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1189 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1190 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1191 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1192 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1193 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1194 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1195 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1196 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1197 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1198 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1199 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1200 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1201 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1202 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1203 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1204 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1205 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1206 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1207 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1208 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1209 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1210 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1211 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1212 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1213 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1214 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1215 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1216 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1217 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1220 Version 1.19.0 (2017-07-20)
1221 ===========================
1226 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1227 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1228 - [Macro recursion limit increased to 1024 from 64.][41676]
1229 - [Added lint for detecting unused macros.][41907]
1230 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1231 For example: `let x = loop { break 7; };`
1232 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1233 contain `Copy` types and cannot have a `Drop` implementation.
1234 Example: `union Foo { bar: u8, baz: usize }`
1235 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1236 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1241 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1242 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1243 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1244 you should use `--target armv7-linux-androideabi`.
1245 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1246 - [Minor optimisation of string operations.][42037]
1247 - [Compiler error message is now `aborting due to previous error(s)` instead of
1248 `aborting due to N previous errors`][42150] This was previously inaccurate and
1249 would only count certain kinds of errors.
1250 - [The compiler now supports Visual Studio 2017][42225]
1251 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1252 - [Added a lot][42264] of [new error codes][42302]
1253 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1254 libraries with C Run-time Libraries(CRT) to be statically linked.
1255 - [Fixed various ARM codegen bugs][42740]
1260 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1261 `Extend<Cow<'a, str>>`][41449]
1262 - [`Vec` now implements `From<&mut [T]>`][41530]
1263 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1264 - [`SplitWhitespace` now implements `Clone`][41659]
1265 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1267 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1268 macros, but for printing to stderr.
1273 - [`OsString::shrink_to_fit`]
1276 - [`thread::ThreadId`]
1281 - [Build scripts can now add environment variables to the environment
1282 the crate is being compiled in.
1283 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1284 - [Subcommands now replace the current process rather than spawning a new
1285 child process][cargo/3970]
1286 - [Workspace members can now accept glob file patterns][cargo/3979]
1287 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1288 the members in a given workspace.][cargo/3988]
1289 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1290 - [Target directory path is now in the cargo metadata][cargo/4022]
1291 - [Cargo no longer checks out a local working directory for the
1292 crates.io index][cargo/4026] This should provide smaller file size for the
1293 registry, and improve cloning times, especially on Windows machines.
1294 - [Added an `--exclude` option for excluding certain packages when using the
1295 `--all` option][cargo/4031]
1296 - [Cargo will now automatically retry when receiving a 5xx error
1297 from crates.io][cargo/4032]
1298 - [The `--features` option now accepts multiple comma or space
1299 delimited values.][cargo/4084]
1300 - [Added support for custom target specific runners][cargo/3954]
1305 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1307 - [Rust will now release XZ compressed packages][rust-installer/57]
1308 - [rustup will now prefer to download rust packages with
1309 XZ compression][rustup/1100] over GZip packages.
1310 - [Added the ability to escape `#` in rust documentation][41785] By adding
1311 additional `#`'s ie. `##` is now `#`
1316 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1317 - [`-Z` flags are now no longer allowed to be used on the stable
1318 compiler.][41751] This has been a warning for a year previous to this.
1319 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1320 longer works][42844]. Users should migrate to the built-in `check`
1321 command, which has been available since 1.16.
1322 - [Ending a float literal with `._` is now a hard error.
1323 Example: `42._` .][41946]
1324 - [Any use of a private `extern crate` outside of its module is now a
1325 hard error.][36886] This was previously a warning.
1326 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1327 relative while the `::` prefix makes a path absolute, but was ignored and the
1328 path was relative regardless.
1329 - [Floating point constants in match patterns is now a hard error][36890]
1330 This was previously a warning.
1331 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1332 match patterns is now a hard error][36891] This was previously a warning.
1333 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1335 - [From the pound escape, lines consisting of multiple `#`s are
1337 - [It is an error to re-export private enum variants][42460]. This is
1338 known to break a number of crates that depend on an older version of
1340 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1341 to use it to find the linker, and the build will fail where it did
1342 not previously][42607]
1344 [36886]: https://github.com/rust-lang/rust/issues/36886
1345 [36888]: https://github.com/rust-lang/rust/issues/36888
1346 [36890]: https://github.com/rust-lang/rust/issues/36890
1347 [36891]: https://github.com/rust-lang/rust/issues/36891
1348 [36892]: https://github.com/rust-lang/rust/issues/36892
1349 [37406]: https://github.com/rust-lang/rust/issues/37406
1350 [39983]: https://github.com/rust-lang/rust/pull/39983
1351 [41145]: https://github.com/rust-lang/rust/pull/41145
1352 [41192]: https://github.com/rust-lang/rust/pull/41192
1353 [41258]: https://github.com/rust-lang/rust/pull/41258
1354 [41370]: https://github.com/rust-lang/rust/pull/41370
1355 [41449]: https://github.com/rust-lang/rust/pull/41449
1356 [41530]: https://github.com/rust-lang/rust/pull/41530
1357 [41624]: https://github.com/rust-lang/rust/pull/41624
1358 [41656]: https://github.com/rust-lang/rust/pull/41656
1359 [41659]: https://github.com/rust-lang/rust/pull/41659
1360 [41676]: https://github.com/rust-lang/rust/pull/41676
1361 [41751]: https://github.com/rust-lang/rust/pull/41751
1362 [41764]: https://github.com/rust-lang/rust/pull/41764
1363 [41785]: https://github.com/rust-lang/rust/pull/41785
1364 [41873]: https://github.com/rust-lang/rust/pull/41873
1365 [41907]: https://github.com/rust-lang/rust/pull/41907
1366 [41946]: https://github.com/rust-lang/rust/pull/41946
1367 [42016]: https://github.com/rust-lang/rust/pull/42016
1368 [42037]: https://github.com/rust-lang/rust/pull/42037
1369 [42068]: https://github.com/rust-lang/rust/pull/42068
1370 [42150]: https://github.com/rust-lang/rust/pull/42150
1371 [42162]: https://github.com/rust-lang/rust/pull/42162
1372 [42225]: https://github.com/rust-lang/rust/pull/42225
1373 [42264]: https://github.com/rust-lang/rust/pull/42264
1374 [42302]: https://github.com/rust-lang/rust/pull/42302
1375 [42460]: https://github.com/rust-lang/rust/issues/42460
1376 [42607]: https://github.com/rust-lang/rust/issues/42607
1377 [42740]: https://github.com/rust-lang/rust/pull/42740
1378 [42844]: https://github.com/rust-lang/rust/issues/42844
1379 [42948]: https://github.com/rust-lang/rust/pull/42948
1380 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1381 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1382 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1383 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1384 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1385 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1386 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1387 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1388 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1389 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1390 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1391 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1392 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1393 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1394 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1395 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1396 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1397 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1398 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1399 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1400 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1401 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1404 Version 1.18.0 (2017-06-08)
1405 ===========================
1410 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1411 make the item visible to just that module tree. Also accepts the keyword
1412 `crate` to make something public to the whole crate but not users of the
1413 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1414 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1415 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1416 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1417 types like `Write + Send`, trailing `+` are now supported in trait objects,
1418 and better error reporting for trait objects starting with `?Sized`.
1419 - [0e+10 is now a valid floating point literal][40589]
1420 - [Now warns if you bind a lifetime parameter to 'static][40734]
1421 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1422 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1423 representation in some cases.][40377]
1428 - [rustc can now emit mir with `--emit mir`][39891]
1429 - [Improved LLVM IR for trivial functions][40367]
1430 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1431 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1432 opportunities found through profiling
1433 - [Improved backtrace formatting when panicking][38165]
1438 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1439 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1440 iteration or reallocation.
1441 - [Simplified HashMap Bucket interface][40561] provides performance
1442 improvements for iterating and cloning.
1443 - [Specialize Vec::from_elem to use calloc][40409]
1444 - [Fixed Race condition in fs::create_dir_all][39799]
1445 - [No longer caching stdio on Windows][40516]
1446 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1447 2.50%~ faster and in one case now 12.50% faster.
1448 - [Optimized `AtomicBool::fetch_nand`][41143]
1453 - [`Child::try_wait`]
1454 - [`HashMap::retain`]
1455 - [`HashSet::retain`]
1457 - [`TcpStream::peek`]
1458 - [`UdpSocket::peek`]
1459 - [`UdpSocket::peek_from`]
1464 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1465 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1466 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1467 - [Added Android build support][cargo/3885]
1468 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1469 of a certain type, for example `cargo build --bins` will build all
1471 - [Added support for haiku][cargo/3952]
1476 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1477 - [Added rust-windbg script for better debugging on Windows][39983]
1478 - [Rust now uses the official cross compiler for NetBSD][40612]
1479 - [rustdoc now accepts `#` at the start of files][40828]
1480 - [Fixed jemalloc support for musl][41168]
1485 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1486 always placed after the sign if it exists and before the digits. With the `#`
1487 flag the zeroes are placed after the prefix and before the digits.
1488 - [Due to the struct field optimisation][40377], using `transmute` on structs
1489 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1490 always been undefined behavior, but is now more likely to break in practice.
1491 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1492 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1493 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1494 - [Overlapping inherent `impl`s are now a hard error][40728]
1495 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1496 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1497 `out.asm` and `out.ll` instead of only one of the filetypes.
1498 - [ calling a function that returns `Self` will no longer work][41805] when
1499 the size of `Self` cannot be statically determined.
1500 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1501 this has caused a few regressions namely:
1503 - Changed the link order of local static/dynamic libraries (respecting the
1504 order on given rather than having the compiler reorder).
1505 - Changed how MinGW is linked, native code linked to dynamic libraries
1506 may require manually linking to the gcc support library (for the native
1509 [38165]: https://github.com/rust-lang/rust/pull/38165
1510 [39799]: https://github.com/rust-lang/rust/pull/39799
1511 [39891]: https://github.com/rust-lang/rust/pull/39891
1512 [39983]: https://github.com/rust-lang/rust/pull/39983
1513 [40043]: https://github.com/rust-lang/rust/pull/40043
1514 [40241]: https://github.com/rust-lang/rust/pull/40241
1515 [40338]: https://github.com/rust-lang/rust/pull/40338
1516 [40367]: https://github.com/rust-lang/rust/pull/40367
1517 [40377]: https://github.com/rust-lang/rust/pull/40377
1518 [40409]: https://github.com/rust-lang/rust/pull/40409
1519 [40516]: https://github.com/rust-lang/rust/pull/40516
1520 [40556]: https://github.com/rust-lang/rust/pull/40556
1521 [40561]: https://github.com/rust-lang/rust/pull/40561
1522 [40589]: https://github.com/rust-lang/rust/pull/40589
1523 [40612]: https://github.com/rust-lang/rust/pull/40612
1524 [40723]: https://github.com/rust-lang/rust/pull/40723
1525 [40728]: https://github.com/rust-lang/rust/pull/40728
1526 [40731]: https://github.com/rust-lang/rust/pull/40731
1527 [40734]: https://github.com/rust-lang/rust/pull/40734
1528 [40805]: https://github.com/rust-lang/rust/pull/40805
1529 [40807]: https://github.com/rust-lang/rust/pull/40807
1530 [40828]: https://github.com/rust-lang/rust/pull/40828
1531 [40870]: https://github.com/rust-lang/rust/pull/40870
1532 [41085]: https://github.com/rust-lang/rust/pull/41085
1533 [41143]: https://github.com/rust-lang/rust/pull/41143
1534 [41168]: https://github.com/rust-lang/rust/pull/41168
1535 [41270]: https://github.com/rust-lang/rust/issues/41270
1536 [41469]: https://github.com/rust-lang/rust/pull/41469
1537 [41805]: https://github.com/rust-lang/rust/issues/41805
1538 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1539 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1540 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1541 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1542 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1543 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1544 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1545 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1546 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1547 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1548 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1549 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1550 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1551 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1554 Version 1.17.0 (2017-04-27)
1555 ===========================
1560 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1561 * [Fields of structs may be initialized without duplicating the field/variable
1562 names][39761]. [RFC 1682]
1563 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1564 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1565 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1566 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1567 `'b`. Soundness fix.
1568 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1569 * [Static variables may contain references to other statics][40027]
1574 * [Exit quickly on only `--emit dep-info`][40336]
1575 * [Make `-C relocation-model` more correctly determine whether the linker
1576 creates a position-independent executable][40245]
1577 * [Add `-C overflow-checks` to directly control whether integer overflow
1579 * [The rustc type checker now checks items on demand instead of in a single
1580 in-order pass][40008]. This is mostly an internal refactoring in support of
1581 future work, including incremental type checking, but also resolves [RFC
1582 1647], allowing `Self` to appear in `impl` `where` clauses.
1583 * [Optimize vtable loads][39995]
1584 * [Turn off vectorization for Emscripten targets][39990]
1585 * [Provide suggestions for unknown macros imported with `use`][39953]
1586 * [Fix ICEs in path resolution][39939]
1587 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1588 * [Add clearer error message using `&str + &str`][39116]
1599 * [`Ordering::then`]
1600 * [`Ordering::then_with`]
1601 * [`BTreeMap::range`]
1602 * [`BTreeMap::range_mut`]
1603 * [`collections::Bound`]
1604 * [`process::abort`]
1605 * [`ptr::read_unaligned`]
1606 * [`ptr::write_unaligned`]
1607 * [`Result::expect_err`]
1610 * [`Cell::into_inner`]
1616 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1617 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1618 * [`String` implements `FromIterator<&char>`][40028]
1619 * `Box` [implements][40009] a number of new conversions:
1620 `From<Box<str>> for String`,
1621 `From<Box<[T]>> for Vec<T>`,
1622 `From<Box<CStr>> for CString`,
1623 `From<Box<OsStr>> for OsString`,
1624 `From<Box<Path>> for PathBuf`,
1625 `Into<Box<str>> for String`,
1626 `Into<Box<[T]>> for Vec<T>`,
1627 `Into<Box<CStr>> for CString`,
1628 `Into<Box<OsStr>> for OsString`,
1629 `Into<Box<Path>> for PathBuf`,
1630 `Default for Box<str>`,
1631 `Default for Box<CStr>`,
1632 `Default for Box<OsStr>`,
1633 `From<&CStr> for Box<CStr>`,
1634 `From<&OsStr> for Box<OsStr>`,
1635 `From<&Path> for Box<Path>`
1636 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1637 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1638 * [Slightly optimize `slice::sort`][39538]
1639 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1640 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1641 `Box<str>` implements `From<&str>`][39438]
1642 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1643 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1644 * [`format!` estimates the needed capacity before writing a string][39356]
1645 * [Support unprivileged symlink creation in Windows][38921]
1646 * [`PathBuf` implements `Default`][38764]
1647 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1648 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1649 and poor hash functions.
1654 * [Add `cargo check --all`][cargo/3731]
1655 * [Add an option to ignore SSL revocation checking][cargo/3699]
1656 * [Add `cargo run --package`][cargo/3691]
1657 * [Add `required_features`][cargo/3667]
1658 * [Assume `build.rs` is a build script][cargo/3664]
1659 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1664 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1666 * [The "Unstable Book" documents nightly-only features][ubook]
1667 * [Improve the style of the sidebar in rustdoc output][40265]
1668 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1669 * [Fix MSP430 breakage due to `i128`][40257]
1670 * [Preliminary Solaris/SPARCv9 support][39903]
1671 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1672 run without installing the MSVC runtime.
1673 * [`rustdoc --test` includes file names in test names][39788]
1674 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1675 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1676 * [Initial support for `aarch64-unknown-freebsd`][39491]
1677 * [Initial support for `i686-unknown-netbsd`][39426]
1678 * [This release no longer includes the old makefile build system][39431]. Rust
1679 is built with a custom build system, written in Rust, and with Cargo.
1680 * [Add Debug implementations for libcollection structs][39002]
1681 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1682 * [`--test-threads=0` produces an error][38945]
1683 * [`rustup` installs documentation by default][40526]
1684 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1685 WinDbg and Visual Studio to improve the debugging experience.
1690 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1691 workaround, either use MSVC 2015 or run vcvars.bat.
1692 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1693 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1694 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1696 * [`format!` and `Display::to_string` panic if an underlying formatting
1697 implementation returns an error][40117]. Previously the error was silently
1698 ignored. It is incorrect for `write_fmt` to return an error when writing
1700 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1701 crates were marked stable and could be accessed from the stable toolchain.
1702 * [Rust git source no longer includes vendored crates][39728]. Those that need
1703 to build with vendored crates should build from release tarballs.
1704 * [Fix inert attributes from `proc_macro_derives`][39572]
1705 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1706 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1708 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1709 existing code generally ignores the type of dead-code unless a type-hint is
1710 provided; this can cause surprising inference interactions particularly around
1711 defaulting. The new code uniformly ignores the result type of dead-code.
1712 * [Tuple-struct constructors with private fields are no longer visible][38932]
1713 * [Lifetime parameters that do not appear in the arguments are now considered
1714 early-bound][38897], resolving a soundness bug (#[32330]). The
1715 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1717 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1718 * [Make transmuting from fn item types to pointer-sized types a hard
1721 [27787]: https://github.com/rust-lang/rust/issues/27787
1722 [32330]: https://github.com/rust-lang/rust/issues/32330
1723 [34198]: https://github.com/rust-lang/rust/pull/34198
1724 [38161]: https://github.com/rust-lang/rust/pull/38161
1725 [38368]: https://github.com/rust-lang/rust/pull/38368
1726 [38584]: https://github.com/rust-lang/rust/issues/38584
1727 [38661]: https://github.com/rust-lang/rust/pull/38661
1728 [38764]: https://github.com/rust-lang/rust/pull/38764
1729 [38864]: https://github.com/rust-lang/rust/issues/38864
1730 [38897]: https://github.com/rust-lang/rust/pull/38897
1731 [38921]: https://github.com/rust-lang/rust/pull/38921
1732 [38932]: https://github.com/rust-lang/rust/pull/38932
1733 [38945]: https://github.com/rust-lang/rust/pull/38945
1734 [38981]: https://github.com/rust-lang/rust/pull/38981
1735 [39002]: https://github.com/rust-lang/rust/pull/39002
1736 [39116]: https://github.com/rust-lang/rust/pull/39116
1737 [39193]: https://github.com/rust-lang/rust/pull/39193
1738 [39265]: https://github.com/rust-lang/rust/pull/39265
1739 [39356]: https://github.com/rust-lang/rust/pull/39356
1740 [39372]: https://github.com/rust-lang/rust/pull/39372
1741 [39426]: https://github.com/rust-lang/rust/pull/39426
1742 [39431]: https://github.com/rust-lang/rust/pull/39431
1743 [39438]: https://github.com/rust-lang/rust/pull/39438
1744 [39440]: https://github.com/rust-lang/rust/pull/39440
1745 [39485]: https://github.com/rust-lang/rust/pull/39485
1746 [39491]: https://github.com/rust-lang/rust/pull/39491
1747 [39518]: https://github.com/rust-lang/rust/pull/39518
1748 [39538]: https://github.com/rust-lang/rust/pull/39538
1749 [39572]: https://github.com/rust-lang/rust/pull/39572
1750 [39633]: https://github.com/rust-lang/rust/pull/39633
1751 [39642]: https://github.com/rust-lang/rust/pull/39642
1752 [39728]: https://github.com/rust-lang/rust/pull/39728
1753 [39761]: https://github.com/rust-lang/rust/pull/39761
1754 [39788]: https://github.com/rust-lang/rust/pull/39788
1755 [39793]: https://github.com/rust-lang/rust/pull/39793
1756 [39837]: https://github.com/rust-lang/rust/pull/39837
1757 [39843]: https://github.com/rust-lang/rust/pull/39843
1758 [39851]: https://github.com/rust-lang/rust/pull/39851
1759 [39903]: https://github.com/rust-lang/rust/pull/39903
1760 [39939]: https://github.com/rust-lang/rust/pull/39939
1761 [39953]: https://github.com/rust-lang/rust/pull/39953
1762 [39960]: https://github.com/rust-lang/rust/pull/39960
1763 [39990]: https://github.com/rust-lang/rust/pull/39990
1764 [39995]: https://github.com/rust-lang/rust/pull/39995
1765 [40008]: https://github.com/rust-lang/rust/pull/40008
1766 [40009]: https://github.com/rust-lang/rust/pull/40009
1767 [40027]: https://github.com/rust-lang/rust/pull/40027
1768 [40028]: https://github.com/rust-lang/rust/pull/40028
1769 [40037]: https://github.com/rust-lang/rust/pull/40037
1770 [40117]: https://github.com/rust-lang/rust/pull/40117
1771 [40166]: https://github.com/rust-lang/rust/pull/40166
1772 [40245]: https://github.com/rust-lang/rust/pull/40245
1773 [40257]: https://github.com/rust-lang/rust/pull/40257
1774 [40261]: https://github.com/rust-lang/rust/pull/40261
1775 [40265]: https://github.com/rust-lang/rust/pull/40265
1776 [40319]: https://github.com/rust-lang/rust/pull/40319
1777 [40336]: https://github.com/rust-lang/rust/pull/40336
1778 [40526]: https://github.com/rust-lang/rust/pull/40526
1779 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1780 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1781 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1782 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1783 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1784 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1785 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1786 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1787 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1788 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1789 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1790 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1791 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1792 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1793 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1794 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1795 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1796 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1797 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1798 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1799 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1800 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1801 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1802 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1803 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1804 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1805 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1806 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1807 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1808 [mdbook]: https://crates.io/crates/mdbook
1809 [ubook]: https://doc.rust-lang.org/unstable-book/
1812 Version 1.16.0 (2017-03-16)
1813 ===========================
1818 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1819 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1820 match patterns][38069]
1821 * [Clean up semantics of `self` in an import list][38313]
1822 * [`Self` may appear in `impl` headers][38920]
1823 * [`Self` may appear in struct expressions][39282]
1828 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1829 a `.rmeta` file containing only crate metadata][38571]. This can be
1830 used by tools like the Rust Language Service to perform
1831 metadata-only builds.
1832 * [Levenshtein based typo suggestions now work in most places, while
1833 previously they worked only for fields and sometimes for local
1834 variables][38927]. Together with the overhaul of "no
1835 resolution"/"unexpected resolution" errors (#[38154]) they result in
1836 large and systematic improvement in resolution diagnostics.
1837 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1839 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1840 * [`rustc` no longer attempts to provide "consider using an explicit
1841 lifetime" suggestions][37057]. They were inaccurate.
1846 * [`VecDeque::truncate`]
1847 * [`VecDeque::resize`]
1848 * [`String::insert_str`]
1849 * [`Duration::checked_add`]
1850 * [`Duration::checked_sub`]
1851 * [`Duration::checked_div`]
1852 * [`Duration::checked_mul`]
1855 * [`SocketAddr::is_ipv4`]
1856 * [`SocketAddr::is_ipv6`]
1857 * [`IpAddr::is_ipv4`]
1858 * [`IpAddr::is_ipv6`]
1860 * [`Vec::dedup_by_key`]
1861 * [`Result::unwrap_or_default`]
1862 * [`<*const T>::wrapping_offset`]
1863 * [`<*mut T>::wrapping_offset`]
1864 * `CommandExt::creation_flags`
1865 * [`File::set_permissions`]
1866 * [`String::split_off`]
1871 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1872 their argument by `Borrow` parameter][37761]
1873 * [All public types in std implement `Debug`][38006]
1874 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1875 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1876 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1878 * [std: Fix partial writes in `LineWriter`][38062]
1879 * [std: Clamp max read/write sizes on Unix][38062]
1880 * [Use more specific panic message for `&str` slicing errors][38066]
1881 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1882 functionality cannot be achieved in std currently.
1883 * [`writeln!`, like `println!`, now accepts a form with no string
1884 or formatting arguments, to just print a newline][38469]
1885 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1886 * [Reduce the size of static data in `std_unicode::tables`][38781]
1887 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1888 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1890 * [`Duration` implements `Sum`][38712]
1891 * [`String` implements `ToSocketAddrs`][39048]
1896 * [The `cargo check` command does a type check of a project without
1897 building it][cargo/3296]
1898 * [crates.io will display CI badges from Travis and AppVeyor, if
1899 specified in Cargo.toml][cargo/3546]
1900 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1901 * [Compilation profiles accept integer values for `debug`, in addition
1902 to `true` and `false`. These are passed to `rustc` as the value to
1903 `-C debuginfo`][cargo/3534]
1904 * [Implement `cargo --version --verbose`][cargo/3604]
1905 * [All builds now output 'dep-info' build dependencies compatible with
1906 make and ninja][cargo/3557]
1907 * [Build all workspace members with `build --all`][cargo/3511]
1908 * [Document all workspace members with `doc --all`][cargo/3515]
1909 * [Path deps outside workspace are not members][cargo/3443]
1914 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1915 the path to the Rust implementation][38589]
1916 * [The `armv7-linux-androideabi` target no longer enables NEON
1917 extensions, per Google's ABI guide][38413]
1918 * [The stock standard library can be compiled for Redox OS][38401]
1919 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1921 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1923 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1928 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1929 match patterns][38069]
1930 * In this release, references to uninhabited types can not be
1931 pattern-matched. This was accidentally allowed in 1.15.
1932 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1933 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1935 * [Clean up semantics of `self` in an import list][38313]
1936 * Reimplemented lifetime elision. This change was almost entirely compatible
1937 with existing code, but it did close a number of small bugs and loopholes,
1938 as well as being more accepting in some other [cases][41105].
1940 [37057]: https://github.com/rust-lang/rust/pull/37057
1941 [37761]: https://github.com/rust-lang/rust/pull/37761
1942 [38006]: https://github.com/rust-lang/rust/pull/38006
1943 [38051]: https://github.com/rust-lang/rust/pull/38051
1944 [38062]: https://github.com/rust-lang/rust/pull/38062
1945 [38062]: https://github.com/rust-lang/rust/pull/38622
1946 [38066]: https://github.com/rust-lang/rust/pull/38066
1947 [38069]: https://github.com/rust-lang/rust/pull/38069
1948 [38131]: https://github.com/rust-lang/rust/pull/38131
1949 [38154]: https://github.com/rust-lang/rust/pull/38154
1950 [38274]: https://github.com/rust-lang/rust/pull/38274
1951 [38304]: https://github.com/rust-lang/rust/pull/38304
1952 [38313]: https://github.com/rust-lang/rust/pull/38313
1953 [38314]: https://github.com/rust-lang/rust/pull/38314
1954 [38327]: https://github.com/rust-lang/rust/pull/38327
1955 [38401]: https://github.com/rust-lang/rust/pull/38401
1956 [38413]: https://github.com/rust-lang/rust/pull/38413
1957 [38469]: https://github.com/rust-lang/rust/pull/38469
1958 [38559]: https://github.com/rust-lang/rust/pull/38559
1959 [38571]: https://github.com/rust-lang/rust/pull/38571
1960 [38580]: https://github.com/rust-lang/rust/pull/38580
1961 [38589]: https://github.com/rust-lang/rust/pull/38589
1962 [38670]: https://github.com/rust-lang/rust/pull/38670
1963 [38712]: https://github.com/rust-lang/rust/pull/38712
1964 [38726]: https://github.com/rust-lang/rust/pull/38726
1965 [38781]: https://github.com/rust-lang/rust/pull/38781
1966 [38798]: https://github.com/rust-lang/rust/pull/38798
1967 [38909]: https://github.com/rust-lang/rust/pull/38909
1968 [38920]: https://github.com/rust-lang/rust/pull/38920
1969 [38927]: https://github.com/rust-lang/rust/pull/38927
1970 [39048]: https://github.com/rust-lang/rust/pull/39048
1971 [39282]: https://github.com/rust-lang/rust/pull/39282
1972 [39379]: https://github.com/rust-lang/rust/pull/39379
1973 [41105]: https://github.com/rust-lang/rust/issues/41105
1974 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1975 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1976 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
1977 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
1978 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
1979 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
1980 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
1981 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
1982 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
1983 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
1984 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
1985 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
1986 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
1987 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
1988 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
1989 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
1990 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
1991 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
1992 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
1993 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
1994 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
1995 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
1996 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
1997 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
1998 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
1999 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2000 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2001 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2002 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2003 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2006 Version 1.15.1 (2017-02-09)
2007 ===========================
2009 * [Fix IntoIter::as_mut_slice's signature][39466]
2010 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2012 [39466]: https://github.com/rust-lang/rust/pull/39466
2013 [39523]: https://github.com/rust-lang/rust/pull/39523
2016 Version 1.15.0 (2017-02-02)
2017 ===========================
2022 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2023 stable. This allows popular code-generating crates like Serde and Diesel to
2024 work ergonomically. [RFC 1681].
2025 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2026 with curly braces][36868]. Part of [RFC 1506].
2027 * [A number of minor changes to name resolution have been activated][37127].
2028 They add up to more consistent semantics, allowing for future evolution of
2029 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2030 details of what is different. The breaking changes here have been transitioned
2031 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2032 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2034 * [`?Sized` can be used in `where` clauses][37791]
2035 * [There is now a limit on the size of monomorphized types and it can be
2036 modified with the `#![type_size_limit]` crate attribute, similarly to
2037 the `#![recursion_limit]` attribute][37789]
2042 * [On Windows, the compiler will apply dllimport attributes when linking to
2043 extern functions][37973]. Additional attributes and flags can control which
2044 library kind is linked and its name. [RFC 1717].
2045 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2046 * [The `--test` flag works with procedural macro crates][38107]
2047 * [Fix `extern "aapcs" fn` ABI][37814]
2048 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2049 * [The `format!` expander recognizes incorrect `printf` and shell-style
2050 formatting directives and suggests the correct format][37613].
2051 * [Only report one error for all unused imports in an import list][37456]
2053 Compiler Performance
2054 --------------------
2056 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2057 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2058 * [Don't clone in `UnificationTable::probe`][37848]
2059 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2060 * [Use small vectors in type walker][37760]
2061 * [Macro expansion performance was improved][37701]
2062 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2063 * [Replace FNV with a faster hash function][37229]
2068 * [`std::iter::Iterator::min_by`]
2069 * [`std::iter::Iterator::max_by`]
2070 * [`std::os::*::fs::FileExt`]
2071 * [`std::sync::atomic::Atomic*::get_mut`]
2072 * [`std::sync::atomic::Atomic*::into_inner`]
2073 * [`std::vec::IntoIter::as_slice`]
2074 * [`std::vec::IntoIter::as_mut_slice`]
2075 * [`std::sync::mpsc::Receiver::try_iter`]
2076 * [`std::os::unix::process::CommandExt::before_exec`]
2077 * [`std::rc::Rc::strong_count`]
2078 * [`std::rc::Rc::weak_count`]
2079 * [`std::sync::Arc::strong_count`]
2080 * [`std::sync::Arc::weak_count`]
2081 * [`std::char::encode_utf8`]
2082 * [`std::char::encode_utf16`]
2083 * [`std::cell::Ref::clone`]
2084 * [`std::io::Take::into_inner`]
2089 * [The standard sorting algorithm has been rewritten for dramatic performance
2090 improvements][38192]. It is a hybrid merge sort, drawing influences from
2091 Timsort. Previously it was a naive merge sort.
2092 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2093 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2095 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2096 and `char_indices().last()`][37882]
2097 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2098 * [Chinese characters display correctly in `fmt::Debug`][37855]
2099 * [Derive `Default` for `Duration`][37699]
2100 * [Support creation of anonymous pipes on WinXP/2k][37677]
2101 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2102 * [Don't pass overlapped handles to processes][38835]
2107 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2108 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2109 should instead check the variable at runtime with `std::env`. That the value
2110 was set at build time was a bug, and incorrect when cross-compiling. This
2111 change is known to cause breakage.
2112 * [Add `--all` flag to `cargo test`][cargo/3221]
2113 * [Compile statically against the MSVC CRT][cargo/3363]
2114 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2115 * [Link OpenSSL statically on OSX][cargo/3311]
2116 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2117 * [Test for bad path overrides with summaries][cargo/3336]
2118 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2119 * [Fix retrying crate downloads for network errors][cargo/3348]
2120 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2121 * [Emit more info on --message-format=json][cargo/3319]
2122 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2123 * [Don't ignore errors in workspace manifest][cargo/3409]
2124 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2129 * [Test runners (binaries built with `--test`) now support a `--list` argument
2130 that lists the tests it contains][38185]
2131 * [Test runners now support a `--exact` argument that makes the test filter
2132 match exactly, instead of matching only a substring of the test name][38181]
2133 * [rustdoc supports a `--playground-url` flag][37763]
2134 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2139 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2140 continue to be used in this release by passing `--disable-rustbuild` to the
2141 configure script, but they will be deleted soon. Note that the new build
2142 system uses a different on-disk layout that will likely affect any scripts
2144 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2146 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2147 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2153 * [A number of minor changes to name resolution have been activated][37127].
2154 They add up to more consistent semantics, allowing for future evolution of
2155 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2156 details of what is different. The breaking changes here have been transitioned
2157 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2158 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2159 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2160 should instead check the variable at runtime with `std::env`. That the value
2161 was set at build time was a bug, and incorrect when cross-compiling. This
2162 change is known to cause breakage.
2163 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2164 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2165 1.10 and is now an error by default. It will become a hard error in the near
2167 * [The semantics relating modules to file system directories are changing in
2168 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2169 lint, which is a warning in this release, and will become a hard error in the
2171 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2172 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2173 the underlying iterator][37834]
2175 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2176 [33685]: https://github.com/rust-lang/rust/issues/33685
2177 [36868]: https://github.com/rust-lang/rust/pull/36868
2178 [37127]: https://github.com/rust-lang/rust/pull/37127
2179 [37229]: https://github.com/rust-lang/rust/pull/37229
2180 [37456]: https://github.com/rust-lang/rust/pull/37456
2181 [37527]: https://github.com/rust-lang/rust/pull/37527
2182 [37602]: https://github.com/rust-lang/rust/pull/37602
2183 [37613]: https://github.com/rust-lang/rust/pull/37613
2184 [37615]: https://github.com/rust-lang/rust/pull/37615
2185 [37636]: https://github.com/rust-lang/rust/pull/37636
2186 [37627]: https://github.com/rust-lang/rust/pull/37627
2187 [37642]: https://github.com/rust-lang/rust/pull/37642
2188 [37677]: https://github.com/rust-lang/rust/pull/37677
2189 [37699]: https://github.com/rust-lang/rust/pull/37699
2190 [37701]: https://github.com/rust-lang/rust/pull/37701
2191 [37705]: https://github.com/rust-lang/rust/pull/37705
2192 [37749]: https://github.com/rust-lang/rust/pull/37749
2193 [37760]: https://github.com/rust-lang/rust/pull/37760
2194 [37763]: https://github.com/rust-lang/rust/pull/37763
2195 [37764]: https://github.com/rust-lang/rust/pull/37764
2196 [37789]: https://github.com/rust-lang/rust/pull/37789
2197 [37791]: https://github.com/rust-lang/rust/pull/37791
2198 [37814]: https://github.com/rust-lang/rust/pull/37814
2199 [37817]: https://github.com/rust-lang/rust/pull/37817
2200 [37834]: https://github.com/rust-lang/rust/pull/37834
2201 [37848]: https://github.com/rust-lang/rust/pull/37848
2202 [37855]: https://github.com/rust-lang/rust/pull/37855
2203 [37882]: https://github.com/rust-lang/rust/pull/37882
2204 [37888]: https://github.com/rust-lang/rust/pull/37888
2205 [37973]: https://github.com/rust-lang/rust/pull/37973
2206 [37979]: https://github.com/rust-lang/rust/pull/37979
2207 [38086]: https://github.com/rust-lang/rust/pull/38086
2208 [38107]: https://github.com/rust-lang/rust/pull/38107
2209 [38117]: https://github.com/rust-lang/rust/pull/38117
2210 [38134]: https://github.com/rust-lang/rust/pull/38134
2211 [38146]: https://github.com/rust-lang/rust/pull/38146
2212 [38181]: https://github.com/rust-lang/rust/pull/38181
2213 [38182]: https://github.com/rust-lang/rust/pull/38182
2214 [38185]: https://github.com/rust-lang/rust/pull/38185
2215 [38192]: https://github.com/rust-lang/rust/pull/38192
2216 [38279]: https://github.com/rust-lang/rust/pull/38279
2217 [38835]: https://github.com/rust-lang/rust/pull/38835
2218 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2219 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2220 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2221 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2222 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2223 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2224 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2225 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2226 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2227 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2228 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2229 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2230 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2231 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2232 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2233 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2234 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2235 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2236 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2237 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2238 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2239 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2240 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2241 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2242 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2243 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2244 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2245 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2246 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2247 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2248 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2249 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2250 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2251 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2252 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2253 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2254 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2255 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2258 Version 1.14.0 (2016-12-22)
2259 ===========================
2264 * [`..` matches multiple tuple fields in enum variants, structs
2265 and tuples][36843]. [RFC 1492].
2266 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2267 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2268 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2269 dereferencing][36822]
2274 * [Mark enums with non-zero discriminant as non-zero][37224]
2275 * [Lower-case `static mut` names are linted like other
2276 statics and consts][37162]
2277 * [Fix ICE on some macros in const integer positions
2278 (e.g. `[u8; m!()]`)][36819]
2279 * [Improve error message and snippet for "did you mean `x`"][36798]
2280 * [Add a panic-strategy field to the target specification][36794]
2281 * [Include LLVM version in `--version --verbose`][37200]
2283 Compile-time Optimizations
2284 --------------------------
2286 * [Improve macro expansion performance][37569]
2287 * [Shrink `Expr_::ExprInlineAsm`][37445]
2288 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2289 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2290 * [Avoid more allocations when compiling html5ever][37373]
2291 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2292 * [Avoid some allocations in the macro parser][37318]
2293 * [Use a faster deflate setting][37298]
2294 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2295 during interning of slices][37270]
2296 * [Optimize `write_metadata`][37267]
2297 * [Don't process obligation forest cycles when stalled][37231]
2298 * [Avoid many `CrateConfig` clones][37161]
2299 * [Optimize `Substs::super_fold_with`][37108]
2300 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2301 * [Speed up `plug_leaks`][36917]
2306 * [`println!()`, with no arguments, prints newline][36825].
2307 Previously, an empty string was required to achieve the same.
2308 * [`Wrapping` impls standard binary and unary operators, as well as
2309 the `Sum` and `Product` iterators][37356]
2310 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2312 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2313 `VecDeque` iterators][37315]
2314 * [Improve `SipHasher` performance on small values][37312]
2315 * [Add Iterator trait TrustedLen to enable better FromIterator /
2317 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2318 * [`ReadDir` implements `Debug`][37221]
2319 * [Implement `RefUnwindSafe` for atomic types][37178]
2320 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2321 * [Avoid allocations in `Decoder::read_str`][37064]
2322 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2323 * [Impl `Debug` for raw pointers to unsized data][36880]
2324 * [Don't reuse `HashMap` random seeds][37470]
2325 * [The internal memory layout of `HashMap` is more cache-friendly, for
2326 significant improvements in some operations][36692]
2327 * [`HashMap` uses less memory on 32-bit architectures][36595]
2328 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2333 * [Expose rustc cfg values to build scripts][cargo/3243]
2334 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2335 * [Fix passing --features when testing multiple packages][cargo/3280]
2336 * [Use a single profile set per workspace][cargo/3249]
2337 * [Load `replace` sections from lock files][cargo/3220]
2338 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2343 * [rustup is the recommended Rust installation method][1.14rustup]
2344 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2345 S390x. These are [tier 2] platforms and may have major defects. Follow the
2346 instructions on the website to install, or add the targets to an existing
2347 installation with `rustup target add`. The new target triples are:
2348 - `mips-unknown-linux-gnu`
2349 - `mipsel-unknown-linux-gnu`
2350 - `mips64-unknown-linux-gnuabi64`
2351 - `mips64el-unknown-linux-gnuabi64 `
2352 - `powerpc-unknown-linux-gnu`
2353 - `powerpc64-unknown-linux-gnu`
2354 - `powerpc64le-unknown-linux-gnu`
2355 - `s390x-unknown-linux-gnu `
2356 * This release includes target (std) builds for ARM Linux running MUSL
2357 libc. These are [tier 2] platforms and may have major defects. Add the
2358 following triples to an existing rustup installation with `rustup target add`:
2359 - `arm-unknown-linux-musleabi`
2360 - `arm-unknown-linux-musleabihf`
2361 - `armv7-unknown-linux-musleabihf`
2362 * This release includes [experimental support for WebAssembly][1.14wasm], via
2363 the `wasm32-unknown-emscripten` target. This target is known to have major
2364 defects. Please test, report, and fix.
2365 * rustup no longer installs documentation by default. Run `rustup
2366 component add rust-docs` to install.
2367 * [Fix line stepping in debugger][37310]
2368 * [Enable line number debuginfo in releases][37280]
2373 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2374 * [Add support for Fuchsia OS][37313]
2375 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2380 * [A number of forward-compatibility lints used by the compiler
2381 to gradually introduce language changes have been converted
2382 to deny by default][36894]:
2383 - ["use of inaccessible extern crate erroneously allowed"][36886]
2384 - ["type parameter default erroneously allowed in invalid location"][36887]
2385 - ["detects super or self keywords at the beginning of global path"][36888]
2386 - ["two overlapping inherent impls define an item with the same name
2387 were erroneously allowed"][36889]
2388 - ["floating-point constants cannot be used in patterns"][36890]
2389 - ["constants of struct or enum type can only be used in a pattern if
2390 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2391 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2392 * [Prohibit patterns in trait methods without bodies][37378]
2393 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2394 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2395 * [The `$crate` macro variable is accepted in fewer locations][37213]
2396 * [Impls specifying extra region requirements beyond the trait
2397 they implement are rejected][37167]
2398 * [Enums may not be unsized][37111]. Unsized enums are intended to
2399 work but never have. For now they are forbidden.
2400 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2402 [tier 2]: https://forge.rust-lang.org/platform-support.html
2403 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2404 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2405 [36430]: https://github.com/rust-lang/rust/pull/36430
2406 [36595]: https://github.com/rust-lang/rust/pull/36595
2407 [36595]: https://github.com/rust-lang/rust/pull/36595
2408 [36692]: https://github.com/rust-lang/rust/pull/36692
2409 [36767]: https://github.com/rust-lang/rust/pull/36767
2410 [36794]: https://github.com/rust-lang/rust/pull/36794
2411 [36798]: https://github.com/rust-lang/rust/pull/36798
2412 [36819]: https://github.com/rust-lang/rust/pull/36819
2413 [36822]: https://github.com/rust-lang/rust/pull/36822
2414 [36825]: https://github.com/rust-lang/rust/pull/36825
2415 [36843]: https://github.com/rust-lang/rust/pull/36843
2416 [36880]: https://github.com/rust-lang/rust/pull/36880
2417 [36886]: https://github.com/rust-lang/rust/issues/36886
2418 [36887]: https://github.com/rust-lang/rust/issues/36887
2419 [36888]: https://github.com/rust-lang/rust/issues/36888
2420 [36889]: https://github.com/rust-lang/rust/issues/36889
2421 [36890]: https://github.com/rust-lang/rust/issues/36890
2422 [36891]: https://github.com/rust-lang/rust/issues/36891
2423 [36892]: https://github.com/rust-lang/rust/issues/36892
2424 [36894]: https://github.com/rust-lang/rust/pull/36894
2425 [36917]: https://github.com/rust-lang/rust/pull/36917
2426 [36993]: https://github.com/rust-lang/rust/pull/36993
2427 [37037]: https://github.com/rust-lang/rust/pull/37037
2428 [37064]: https://github.com/rust-lang/rust/pull/37064
2429 [37094]: https://github.com/rust-lang/rust/pull/37094
2430 [37108]: https://github.com/rust-lang/rust/pull/37108
2431 [37111]: https://github.com/rust-lang/rust/pull/37111
2432 [37161]: https://github.com/rust-lang/rust/pull/37161
2433 [37162]: https://github.com/rust-lang/rust/pull/37162
2434 [37167]: https://github.com/rust-lang/rust/pull/37167
2435 [37178]: https://github.com/rust-lang/rust/pull/37178
2436 [37200]: https://github.com/rust-lang/rust/pull/37200
2437 [37213]: https://github.com/rust-lang/rust/pull/37213
2438 [37221]: https://github.com/rust-lang/rust/pull/37221
2439 [37224]: https://github.com/rust-lang/rust/pull/37224
2440 [37230]: https://github.com/rust-lang/rust/pull/37230
2441 [37231]: https://github.com/rust-lang/rust/pull/37231
2442 [37247]: https://github.com/rust-lang/rust/pull/37247
2443 [37267]: https://github.com/rust-lang/rust/pull/37267
2444 [37270]: https://github.com/rust-lang/rust/pull/37270
2445 [37273]: https://github.com/rust-lang/rust/pull/37273
2446 [37280]: https://github.com/rust-lang/rust/pull/37280
2447 [37298]: https://github.com/rust-lang/rust/pull/37298
2448 [37306]: https://github.com/rust-lang/rust/pull/37306
2449 [37310]: https://github.com/rust-lang/rust/pull/37310
2450 [37312]: https://github.com/rust-lang/rust/pull/37312
2451 [37313]: https://github.com/rust-lang/rust/pull/37313
2452 [37315]: https://github.com/rust-lang/rust/pull/37315
2453 [37318]: https://github.com/rust-lang/rust/pull/37318
2454 [37322]: https://github.com/rust-lang/rust/pull/37322
2455 [37326]: https://github.com/rust-lang/rust/pull/37326
2456 [37351]: https://github.com/rust-lang/rust/pull/37351
2457 [37356]: https://github.com/rust-lang/rust/pull/37356
2458 [37367]: https://github.com/rust-lang/rust/pull/37367
2459 [37373]: https://github.com/rust-lang/rust/pull/37373
2460 [37378]: https://github.com/rust-lang/rust/pull/37378
2461 [37389]: https://github.com/rust-lang/rust/pull/37389
2462 [37392]: https://github.com/rust-lang/rust/pull/37392
2463 [37427]: https://github.com/rust-lang/rust/pull/37427
2464 [37439]: https://github.com/rust-lang/rust/pull/37439
2465 [37445]: https://github.com/rust-lang/rust/pull/37445
2466 [37470]: https://github.com/rust-lang/rust/pull/37470
2467 [37569]: https://github.com/rust-lang/rust/pull/37569
2468 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2469 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2470 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2471 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2472 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2473 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2474 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2477 Version 1.13.0 (2016-11-10)
2478 ===========================
2483 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2484 errors, like the `try!` macro, described in [RFC 0243].
2485 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2486 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2487 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2488 * [Fix lifetime rules for 'if' conditions][36029]
2489 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2494 * [Add the `-C link-arg` argument][36574]
2495 * [Remove the old AST-based backend from rustc_trans][35764]
2496 * [Don't enable NEON by default on armv7 Linux][35814]
2497 * [Fix debug line number info for macro expansions][35238]
2498 * [Do not emit "class method" debuginfo for types that are not
2499 DICompositeType][36008]
2500 * [Warn about multiple conflicting #[repr] hints][34623]
2501 * [When sizing DST, don't double-count nested struct prefixes][36351]
2502 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2503 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2504 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2505 * [Expand macros without recursing to avoid stack overflows][36214]
2510 * [Replace macro backtraces with labeled local uses][35702]
2511 * [Improve error message for misplaced doc comments][33922]
2512 * [Buffer unix and lock windows to prevent message interleaving][35975]
2513 * [Update lifetime errors to specifically note temporaries][36171]
2514 * [Special case a few colors for Windows][36178]
2515 * [Suggest `use self` when such an import resolves][36289]
2516 * [Be more specific when type parameter shadows primitive type][36338]
2517 * Many minor improvements
2519 Compile-time Optimizations
2520 --------------------------
2522 * [Compute and cache HIR hashes at beginning][35854]
2523 * [Don't hash types in loan paths][36004]
2524 * [Cache projections in trans][35761]
2525 * [Optimize the parser's last token handling][36527]
2526 * [Only instantiate #[inline] functions in codegen units referencing
2527 them][36524]. This leads to big improvements in cases where crates export
2528 define many inline functions without using them directly.
2529 * [Lazily allocate TypedArena's first chunk][36592]
2530 * [Don't allocate during default HashSet creation][36734]
2537 * [`overflowing_abs`]
2538 * [`RefCell::try_borrow`]
2539 * [`RefCell::try_borrow_mut`]
2544 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2545 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2547 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2548 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2549 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2550 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2551 * [Use arc4rand on FreeBSD][35884]
2552 * [memrchr: Correct aligned offset computation][35969]
2553 * [Improve Demangling of Rust Symbols][36059]
2554 * [Use monotonic time in condition variables][35048]
2555 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2556 * [Implement conversion traits for `char`][35755]
2557 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2558 * [Zero first byte of CString on drop][36264]
2559 * [Inherit overflow checks for sum and product][36372]
2560 * [Add missing Eq implementations][36423]
2561 * [Implement `Debug` for `DirEntry`][36631]
2562 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2564 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2565 * [Implement more traits for `std::io::ErrorKind`][35911]
2566 * [Optimize BinaryHeap bounds checking][36072]
2567 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2568 `extend_with_element`][36355]
2569 * [Fix overflow checking in unsigned pow()][34942]
2574 * This release includes security fixes to both curl and OpenSSL.
2575 * [Fix transitive doctests when panic=abort][cargo/3021]
2576 * [Add --all-features flag to cargo][cargo/3038]
2577 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2578 * [Don't parse the home directory more than once][cargo/3078]
2579 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2580 * [Update OpenSSL to 1.0.2j][cargo/3121]
2581 * [Add license and license_file to cargo metadata output][cargo/3110]
2582 * [Make crates-io registry URL optional in config; ignore all changes to
2583 source.crates-io][cargo/3089]
2584 * [Don't download dependencies from other platforms][cargo/3123]
2585 * [Build transitive dev-dependencies when needed][cargo/3125]
2586 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2587 * [Avoid updating registry when adding existing deps][cargo/3144]
2588 * [Warn about path overrides that won't work][cargo/3136]
2589 * [Use workspaces during `cargo install`][cargo/3146]
2590 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2591 * [Add --message-format flag][cargo/3000]
2592 * [Pass target environment for rustdoc][cargo/3205]
2593 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2594 * [Update curl and curl-sys][cargo/3241]
2595 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2600 * [rustdoc: Add the `--sysroot` argument][36586]
2601 * [rustdoc: Fix a couple of issues with the search results][35655]
2602 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2603 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2604 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2609 * [Remove unmaintained style guide][35124]
2610 * [Add s390x support][36369]
2611 * [Initial work at Haiku OS support][36727]
2612 * [Add mips-uclibc targets][35734]
2613 * [Crate-ify compiler-rt into compiler-builtins][35021]
2614 * [Add rustc version info (git hash + date) to dist tarball][36213]
2615 * Many documentation improvements
2620 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2621 * [Deny (by default) transmuting from fn item types to pointer-sized
2622 types][34923]. Continuing the long transition to zero-sized fn items,
2624 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2626 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2627 * [Fix lifetime rules for 'if' conditions][36029].
2628 * [Inherit overflow checks for sum and product][36372].
2629 * [Forbid user-defined macros named "macro_rules"][36730].
2631 [33922]: https://github.com/rust-lang/rust/pull/33922
2632 [34623]: https://github.com/rust-lang/rust/pull/34623
2633 [34923]: https://github.com/rust-lang/rust/pull/34923
2634 [34942]: https://github.com/rust-lang/rust/pull/34942
2635 [34982]: https://github.com/rust-lang/rust/pull/34982
2636 [35021]: https://github.com/rust-lang/rust/pull/35021
2637 [35048]: https://github.com/rust-lang/rust/pull/35048
2638 [35074]: https://github.com/rust-lang/rust/pull/35074
2639 [35124]: https://github.com/rust-lang/rust/pull/35124
2640 [35234]: https://github.com/rust-lang/rust/pull/35234
2641 [35238]: https://github.com/rust-lang/rust/pull/35238
2642 [35354]: https://github.com/rust-lang/rust/pull/35354
2643 [35559]: https://github.com/rust-lang/rust/pull/35559
2644 [35585]: https://github.com/rust-lang/rust/pull/35585
2645 [35627]: https://github.com/rust-lang/rust/pull/35627
2646 [35655]: https://github.com/rust-lang/rust/pull/35655
2647 [35702]: https://github.com/rust-lang/rust/pull/35702
2648 [35707]: https://github.com/rust-lang/rust/pull/35707
2649 [35728]: https://github.com/rust-lang/rust/pull/35728
2650 [35734]: https://github.com/rust-lang/rust/pull/35734
2651 [35755]: https://github.com/rust-lang/rust/pull/35755
2652 [35761]: https://github.com/rust-lang/rust/pull/35761
2653 [35764]: https://github.com/rust-lang/rust/pull/35764
2654 [35814]: https://github.com/rust-lang/rust/pull/35814
2655 [35854]: https://github.com/rust-lang/rust/pull/35854
2656 [35871]: https://github.com/rust-lang/rust/pull/35871
2657 [35884]: https://github.com/rust-lang/rust/pull/35884
2658 [35911]: https://github.com/rust-lang/rust/pull/35911
2659 [35969]: https://github.com/rust-lang/rust/pull/35969
2660 [35975]: https://github.com/rust-lang/rust/pull/35975
2661 [36004]: https://github.com/rust-lang/rust/pull/36004
2662 [36008]: https://github.com/rust-lang/rust/pull/36008
2663 [36014]: https://github.com/rust-lang/rust/pull/36014
2664 [36029]: https://github.com/rust-lang/rust/pull/36029
2665 [36059]: https://github.com/rust-lang/rust/pull/36059
2666 [36072]: https://github.com/rust-lang/rust/pull/36072
2667 [36101]: https://github.com/rust-lang/rust/pull/36101
2668 [36104]: https://github.com/rust-lang/rust/pull/36104
2669 [36171]: https://github.com/rust-lang/rust/pull/36171
2670 [36173]: https://github.com/rust-lang/rust/pull/36173
2671 [36178]: https://github.com/rust-lang/rust/pull/36178
2672 [36213]: https://github.com/rust-lang/rust/pull/36213
2673 [36214]: https://github.com/rust-lang/rust/pull/36214
2674 [36264]: https://github.com/rust-lang/rust/pull/36264
2675 [36266]: https://github.com/rust-lang/rust/pull/36266
2676 [36289]: https://github.com/rust-lang/rust/pull/36289
2677 [36338]: https://github.com/rust-lang/rust/pull/36338
2678 [36351]: https://github.com/rust-lang/rust/pull/36351
2679 [36355]: https://github.com/rust-lang/rust/pull/36355
2680 [36369]: https://github.com/rust-lang/rust/pull/36369
2681 [36372]: https://github.com/rust-lang/rust/pull/36372
2682 [36423]: https://github.com/rust-lang/rust/pull/36423
2683 [36482]: https://github.com/rust-lang/rust/pull/36482
2684 [36505]: https://github.com/rust-lang/rust/pull/36505
2685 [36524]: https://github.com/rust-lang/rust/pull/36524
2686 [36527]: https://github.com/rust-lang/rust/pull/36527
2687 [36551]: https://github.com/rust-lang/rust/pull/36551
2688 [36574]: https://github.com/rust-lang/rust/pull/36574
2689 [36586]: https://github.com/rust-lang/rust/pull/36586
2690 [36592]: https://github.com/rust-lang/rust/pull/36592
2691 [36631]: https://github.com/rust-lang/rust/pull/36631
2692 [36639]: https://github.com/rust-lang/rust/pull/36639
2693 [36721]: https://github.com/rust-lang/rust/pull/36721
2694 [36727]: https://github.com/rust-lang/rust/pull/36727
2695 [36730]: https://github.com/rust-lang/rust/pull/36730
2696 [36734]: https://github.com/rust-lang/rust/pull/36734
2697 [36754]: https://github.com/rust-lang/rust/pull/36754
2698 [36995]: https://github.com/rust-lang/rust/pull/36995
2699 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2700 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2701 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2702 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2703 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2704 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2705 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2706 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2707 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2708 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2709 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2710 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2711 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2712 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2713 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2714 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2715 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2716 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2717 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2718 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2719 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2720 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2721 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
2722 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
2723 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
2724 [rustup]: https://www.rustup.rs
2725 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
2726 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
2727 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
2728 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
2729 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
2730 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
2731 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
2734 Version 1.12.1 (2016-10-20)
2735 ===========================
2740 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
2741 * [Confusion with double negation and booleans][36856]
2742 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
2743 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
2744 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
2745 * [Corrupted memory after updated to 1.12][36936]
2746 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
2747 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
2748 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
2750 [36381]: https://github.com/rust-lang/rust/issues/36381
2751 [36856]: https://github.com/rust-lang/rust/issues/36856
2752 [36875]: https://github.com/rust-lang/rust/issues/36875
2753 [36924]: https://github.com/rust-lang/rust/issues/36924
2754 [36926]: https://github.com/rust-lang/rust/issues/36926
2755 [36936]: https://github.com/rust-lang/rust/issues/36936
2756 [37026]: https://github.com/rust-lang/rust/issues/37026
2757 [37112]: https://github.com/rust-lang/rust/issues/37112
2758 [37153]: https://github.com/rust-lang/rust/issues/37153
2761 Version 1.12.0 (2016-09-29)
2762 ===========================
2767 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2768 This translation pass is far simpler than the previous AST->LLVM pass, and
2769 creates opportunities to perform new optimizations directly on the MIR. It
2770 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2771 * [`rustc` presents a new, more readable error format, along with
2772 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2773 Most common editors supporting Rust have been updated to work with it. It was
2774 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2779 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2780 This translation pass is far simpler than the previous AST->LLVM pass, and
2781 creates opportunities to perform new optimizations directly on the MIR. It
2782 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2783 * [Print the Rust target name, not the LLVM target name, with
2784 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2785 * [The computation of `TypeId` is correct in some cases where it was previously
2786 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2787 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2788 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2789 `--print relocation-models`, and `--print code-models` print the available
2790 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2791 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2792 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2793 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2794 These targets produce statically-linked binaries. There are no binary release
2800 * [`rustc` presents a new, more readable error format, along with
2801 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2802 Most common editors supporting Rust have been updated to work with it. It was
2803 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2804 * [In error descriptions, references are now described in plain English,
2805 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2806 * [In error type descriptions, unknown numeric types are named `{integer}` or
2807 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2808 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2813 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2814 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2815 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2816 useful](https://github.com/rust-lang/rust/pull/34908)
2817 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2818 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2819 * [Semicolons are properly required as statement delimiters inside
2820 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2821 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2826 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2827 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2828 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2829 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2830 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2831 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2832 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2833 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2834 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2835 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2836 Both on Unix and Windows.
2837 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2838 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2839 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2840 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2841 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2842 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2843 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2844 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2849 * [The `format!` macro and friends now allow a single argument to be formatted
2850 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2851 * [The lifetime bounds on `[T]::binary_search_by` and
2852 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2853 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2854 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2855 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2856 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2857 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2858 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2859 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2860 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2861 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2862 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2863 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2864 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2865 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2866 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2867 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2868 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2869 * [`mpsc::sync_channel` `Receiver`s return any available message before
2870 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2871 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2872 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2877 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2878 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2879 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2880 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2881 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2882 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2883 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2884 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2885 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2886 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2887 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2888 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2889 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2890 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2891 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2892 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2897 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2898 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2903 * [Test binaries now support a `--test-threads` argument to specify the number
2904 of threads used to run tests, and which acts the same as the
2905 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2906 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2907 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2908 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2909 * [Rust releases now come with source packages that can be installed by rustup
2910 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2911 The resulting source code can be used by tools and IDES, located in the
2912 sysroot under `lib/rustlib/src`.
2917 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2918 * Many minor improvements to the documentation.
2919 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2924 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2925 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2926 * [When formatting strings, if "precision" is specified, the "fill",
2927 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2928 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2931 Version 1.11.0 (2016-08-18)
2932 ===========================
2937 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2938 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2939 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2940 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2941 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2946 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2947 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2948 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2949 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2950 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2951 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2952 (in libcore - previously stabilized in libstd)
2953 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2954 (in libcore - previously stabilized in libstd)
2955 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2956 (in libcore - previously stabilized in libstd)
2957 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
2958 (in libcore - previously stabilized in libstd)
2959 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2960 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2961 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
2962 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
2967 * [The `thread_local!` macro supports multiple definitions in a single
2968 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
2969 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
2970 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
2971 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
2972 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
2973 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
2974 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
2975 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
2980 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
2981 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
2982 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
2983 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
2984 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
2985 and `-vv` prints warnings for all crates.
2986 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
2987 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
2988 This provides room for expansion by arbitrary tools.
2989 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
2990 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
2991 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
2992 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
2993 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
2994 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
2995 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3000 * [Caching projections speeds up type check dramatically for some
3001 workloads](https://github.com/rust-lang/rust/pull/33816)
3002 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3003 This hasher is faster, but is believed to provide sufficient
3004 protection from collision attacks.
3005 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3010 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3011 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3012 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3013 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3014 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3019 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3020 * [When emitting debug info, rustc emits frame pointers for closures,
3021 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3022 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3023 * Many more errors have been given error codes and extended
3025 * API documentation continues to be improved, with many new examples
3030 * [rustc no longer hangs when dependencies recursively re-export
3031 submodules](https://github.com/rust-lang/rust/pull/34542)
3032 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3033 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3034 rewritten](https://github.com/rust-lang/rust/pull/33895)
3035 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3036 No targets use this yet, but it works toward AVR support.
3041 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3042 * [The new follow-set rules that place restrictions on `macro_rules!`
3043 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3044 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3045 and has been a warning since 1.10.
3046 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3047 This causes breakage in some corner cases.
3050 Version 1.10.0 (2016-07-07)
3051 ===========================
3056 * [Allow `concat_idents!` in type positions as well as in expression
3057 positions](https://github.com/rust-lang/rust/pull/33735).
3058 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3059 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3060 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3061 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3062 * [`panic!` can be converted to a runtime abort with the
3063 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3064 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3065 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3066 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3067 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
3068 Note that Cargo does not yet directly support cdylibs.
3073 * `os::windows::fs::OpenOptionsExt::access_mode`
3074 * `os::windows::fs::OpenOptionsExt::share_mode`
3075 * `os::windows::fs::OpenOptionsExt::custom_flags`
3076 * `os::windows::fs::OpenOptionsExt::attributes`
3077 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3078 * `os::unix::fs::OpenOptionsExt::custom_flags`
3079 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3080 * `Default for sync::Weak`
3081 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3082 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3083 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3084 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3085 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3086 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3087 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3088 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3089 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3090 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3091 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3092 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3093 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3094 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3095 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3096 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3097 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3098 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3099 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3100 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3101 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3102 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3103 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3104 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3105 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3106 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3107 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3108 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3109 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3110 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3111 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3112 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3113 * Read/Write/RawFd impls for `UnixStream`
3114 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3115 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3116 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3117 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3118 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3119 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3120 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3121 * RawFd impls for `UnixListener`
3122 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3123 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3124 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3125 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3126 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3127 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3128 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3129 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3130 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3131 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3132 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3133 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3134 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3135 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3136 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3137 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3138 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3139 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3140 * RawFd impls for `UnixDatagram`
3141 * `{BTree,Hash}Map::values_mut`
3142 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
3147 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3148 The semantics of this minor method are subtle and probably not what
3150 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3151 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3152 will fall back to `/dev/urandom` temporarily to avoid blocking
3153 during early boot](https://github.com/rust-lang/rust/pull/33086).
3154 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3155 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3156 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3157 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3158 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3159 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3160 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3164 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3165 This controls the runtime behavior of the `panic!` macro
3166 and can be either "unwind" (the default), or "abort".
3167 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3168 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3169 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3170 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3171 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3172 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3173 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3174 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3175 By default they are retried twice, which can be customized with the
3176 `net.retry` value in `.cargo/config`.
3177 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3178 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3179 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3180 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3181 Makes it possible to install multiple crates in parallel.
3182 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3183 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3184 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3185 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3186 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3187 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3192 * [rustc memory usage was reduced by refactoring the context used for
3193 type checking](https://github.com/rust-lang/rust/pull/33425).
3194 * [Speed up creation of `HashMap`s by caching the random keys used
3195 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3196 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3197 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3198 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3199 10x faster than the previous lookup tables.
3200 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3205 * Many incremental improvements to documentation and rustdoc.
3206 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3207 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3208 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3209 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3210 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3211 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3212 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3217 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3218 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3219 * [`std` no longer prints backtraces on platforms where the running
3220 module must be loaded with `env::current_exe`, which can't be relied
3221 on](https://github.com/rust-lang/rust/pull/33554).
3222 * This release includes std binaries for the i586-unknown-linux-gnu,
3223 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3224 i586 target is for old x86 hardware without SSE2, and the armv7
3225 target is for Android running on modern ARM architectures.
3226 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3227 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3228 * [On Unix the runtime aborts by calling `libc::abort` instead of
3229 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3230 * [Rust is now bootstrapped from the previous release of Rust,
3231 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3236 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3237 * [`target_env` for Linux ARM targets is just `gnu`, not
3238 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3239 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3240 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3241 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3242 Affects how macros are parsed.
3243 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3244 * [Feature-gated attributes on macro-generated macro invocations are
3245 now rejected](https://github.com/rust-lang/rust/pull/32791).
3246 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3247 This caused some minor changes to type inference.
3250 Version 1.9.0 (2016-05-26)
3251 ==========================
3256 * The `#[deprecated]` attribute when applied to an API will generate
3257 warnings when used. The warnings may be suppressed with
3258 `#[allow(deprecated)]`. [RFC 1270].
3259 * [`fn` item types are zero sized, and each `fn` names a unique
3260 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3261 `transmute` on a `fn` type will generate a warning for a few cycles,
3262 then will be converted to an error.
3263 * [Field and method resolution understand visibility, so private
3264 fields and methods cannot prevent the proper use of public fields
3265 and methods][1.9fv].
3266 * [The parser considers unicode codepoints in the
3267 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3273 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3274 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3275 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3276 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3277 * [`str::is_char_boundary`]
3278 * [`<*const T>::as_ref`]
3279 * [`<*mut T>::as_ref`]
3280 * [`<*mut T>::as_mut`]
3281 * [`AsciiExt::make_ascii_uppercase`]
3282 * [`AsciiExt::make_ascii_lowercase`]
3283 * [`char::decode_utf16`]
3284 * [`char::DecodeUtf16`]
3285 * [`char::DecodeUtf16Error`]
3286 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3287 * [`BTreeSet::take`]
3288 * [`BTreeSet::replace`]
3291 * [`HashSet::replace`]
3293 * [`OsString::with_capacity`]
3294 * [`OsString::clear`]
3295 * [`OsString::capacity`]
3296 * [`OsString::reserve`]
3297 * [`OsString::reserve_exact`]
3298 * [`OsStr::is_empty`]
3300 * [`std::os::unix::thread`]
3303 * [`JoinHandleExt::as_pthread_t`]
3304 * [`JoinHandleExt::into_pthread_t`]
3305 * [`HashSet::hasher`]
3306 * [`HashMap::hasher`]
3307 * [`CommandExt::exec`]
3308 * [`File::try_clone`]
3309 * [`SocketAddr::set_ip`]
3310 * [`SocketAddr::set_port`]
3311 * [`SocketAddrV4::set_ip`]
3312 * [`SocketAddrV4::set_port`]
3313 * [`SocketAddrV6::set_ip`]
3314 * [`SocketAddrV6::set_port`]
3315 * [`SocketAddrV6::set_flowinfo`]
3316 * [`SocketAddrV6::set_scope_id`]
3317 * [`slice::copy_from_slice`]
3318 * [`ptr::read_volatile`]
3319 * [`ptr::write_volatile`]
3320 * [`OpenOptions::create_new`]
3321 * [`TcpStream::set_nodelay`]
3322 * [`TcpStream::nodelay`]
3323 * [`TcpStream::set_ttl`]
3324 * [`TcpStream::ttl`]
3325 * [`TcpStream::set_only_v6`]
3326 * [`TcpStream::only_v6`]
3327 * [`TcpStream::take_error`]
3328 * [`TcpStream::set_nonblocking`]
3329 * [`TcpListener::set_ttl`]
3330 * [`TcpListener::ttl`]
3331 * [`TcpListener::set_only_v6`]
3332 * [`TcpListener::only_v6`]
3333 * [`TcpListener::take_error`]
3334 * [`TcpListener::set_nonblocking`]
3335 * [`UdpSocket::set_broadcast`]
3336 * [`UdpSocket::broadcast`]
3337 * [`UdpSocket::set_multicast_loop_v4`]
3338 * [`UdpSocket::multicast_loop_v4`]
3339 * [`UdpSocket::set_multicast_ttl_v4`]
3340 * [`UdpSocket::multicast_ttl_v4`]
3341 * [`UdpSocket::set_multicast_loop_v6`]
3342 * [`UdpSocket::multicast_loop_v6`]
3343 * [`UdpSocket::set_multicast_ttl_v6`]
3344 * [`UdpSocket::multicast_ttl_v6`]
3345 * [`UdpSocket::set_ttl`]
3346 * [`UdpSocket::ttl`]
3347 * [`UdpSocket::set_only_v6`]
3348 * [`UdpSocket::only_v6`]
3349 * [`UdpSocket::join_multicast_v4`]
3350 * [`UdpSocket::join_multicast_v6`]
3351 * [`UdpSocket::leave_multicast_v4`]
3352 * [`UdpSocket::leave_multicast_v6`]
3353 * [`UdpSocket::take_error`]
3354 * [`UdpSocket::connect`]
3355 * [`UdpSocket::send`]
3356 * [`UdpSocket::recv`]
3357 * [`UdpSocket::set_nonblocking`]
3362 * [`std::sync::Once` is poisoned if its initialization function
3364 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3365 * [Most types implement `fmt::Debug`][1.9db].
3366 * [The default buffer size used by `BufReader` and `BufWriter` was
3367 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3368 used by other languages.
3369 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3370 `Duration` additionally implements `*=` and `/=`][1.9ta].
3371 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3372 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3373 * [`Chain` implements `BufRead`][1.9ch].
3374 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3379 * [Cargo can now run concurrently][1.9cc].
3380 * [Top-level overrides allow specific revisions of crates to be
3381 overridden through the entire crate graph][1.9ct]. This is intended
3382 to make upgrades easier for large projects, by allowing crates to be
3383 forked temporarily until they've been upgraded and republished.
3384 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3385 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3386 on the commandline][1.9cf]. `rustc` arguments can also be specified
3387 in the `build.rustflags` configuration key.
3392 * [The time complexity of comparing variables for equivalence during type
3393 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3394 to major compilation time improvement in some scenarios.
3395 * [`ToString` is specialized for `str`, giving it the same performance
3396 as `to_owned`][1.9ts].
3397 * [Spawning processes with `Command::output` no longer creates extra
3399 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3400 for C-like enums][1.9cl].
3405 * [Passing the `--quiet` flag to a test runner will produce
3406 much-abbreviated output][1.9q].
3407 * The Rust Project now publishes std binaries for the
3408 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3409 `i586-pc-windows-msvc` targets.
3414 * [`std::sync::Once` is poisoned if its initialization function
3416 * [It is illegal to define methods with the same name in overlapping
3417 inherent `impl` blocks][1.9sn].
3418 * [`fn` item types are zero sized, and each `fn` names a unique
3419 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3420 `transmute` on a `fn` type will generate a warning for a few cycles,
3421 then will be converted to an error.
3422 * [Improvements to const evaluation may trigger new errors when integer
3423 literals are out of range][1.9ce].
3426 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3427 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3428 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3429 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3430 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3431 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3432 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3433 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3434 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3435 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3436 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3437 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3438 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3439 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3440 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3441 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3442 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3443 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3444 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3445 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3446 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3447 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3448 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3449 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3450 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3451 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3452 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3453 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3454 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3455 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3456 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3457 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3458 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3459 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3460 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3461 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3462 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3463 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3464 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3465 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3466 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3467 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3468 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3469 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3470 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3471 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3472 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3473 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3474 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3475 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3476 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3477 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3478 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3479 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3480 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3481 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3482 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3483 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3484 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3485 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3486 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3487 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3488 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3489 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3490 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3491 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3492 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3493 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3494 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3495 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3496 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3497 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3498 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3499 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3500 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3501 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3502 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3503 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3504 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3505 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3506 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3507 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3508 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3509 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3510 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3511 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3512 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3513 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3514 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3515 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3516 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3517 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3518 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3519 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3520 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3521 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3522 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3523 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3524 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3525 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3526 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3527 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3528 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3529 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3530 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3531 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3532 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3533 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3534 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3535 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3538 Version 1.8.0 (2016-04-14)
3539 ==========================
3544 * Rust supports overloading of compound assignment statements like
3545 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3546 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3547 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3549 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3550 addition to the non-braced form, `struct Foo;`. [RFC 218].
3556 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3557 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3560 * [`ptr::drop_in_place`]
3562 * [`time::SystemTime`]
3564 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3565 * [`Instant::elapsed`]
3566 * [`SystemTime::now`]
3567 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3568 * [`SystemTime::elapsed`]
3569 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3570 * [`SystemTimeError`]
3571 * [`SystemTimeError::duration`]
3572 * Various impls for `SystemTimeError`
3574 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3575 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3576 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3577 * [The `write!` and `writeln!` macros correctly emit errors if any of
3578 their arguments can't be formatted][1.8w].
3579 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3580 * [The Unix-specific `raw` modules, which contain a number of
3581 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3582 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3583 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3584 across platforms was making it difficult to implement `std`
3585 correctly. Those that need these definitions should use the `libc`
3587 * The Unix-specific `MetadataExt` traits, including
3588 `os::unix::fs::MetadataExt`, which expose values such as inode
3589 numbers [no longer return platform-specific types][1.8r], but
3590 instead return widened integers. [RFC 1415].
3591 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3592 * [Atomic loads and stores are not volatile][1.8a].
3593 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3598 * [Inlining hash functions lead to a 3% compile-time improvement in
3599 some workloads][1.8h].
3600 * When using jemalloc, its symbols are [unprefixed so that it
3601 overrides the libc malloc implementation][1.8h]. This means that for
3602 rustc, LLVM is now using jemalloc, which results in a 6%
3603 compile-time improvement on a specific workload.
3604 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3609 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3610 i686-pc-windows-msvc is now considered a tier-1 platform.
3611 * [The `--print targets` flag prints a list of supported targets][1.8t].
3612 * [The `--print cfg` flag prints the `cfg`s defined for the current
3614 * [`rustc` can be built with an new Cargo-based build system, written
3615 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3616 build system. To enable it configure with `configure --rustbuild`.
3617 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3618 variants while also indicating the total number of missing variants
3619 if more than 3][1.8m].
3620 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3621 * The Rust Project now publishes binary releases of the standard
3622 library for a number of tier-2 targets:
3623 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3624 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3625 `x86_64-rumprun-netbsd`. These can be installed with
3626 tools such as [multirust][1.8mr].
3631 * [`cargo init` creates a new Cargo project in the current
3632 directory][1.8ci]. It is otherwise like `cargo new`.
3633 * [Cargo has configuration keys for `-v` and
3634 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3635 `[term]` section of `.cargo/config`.
3636 * [Configuration keys that evaluate to strings or integers can be set
3637 via environment variables][1.8ce]. For example the `build.jobs` key
3638 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3639 precedence over config files.
3640 * [Target-specific dependencies support Rust `cfg` syntax for
3641 describing targets][1.8cfg] so that dependencies for multiple
3642 targets can be specified together. [RFC 1361].
3643 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3644 `RUSTDOC` take precedence over the `build.target-dir`,
3645 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3646 * [The child process tree is killed on Windows when Cargo is
3648 * [The `build.target` configuration value sets the target platform,
3649 like `--target`][1.8ct].
3654 * [Unstable compiler flags have been further restricted][1.8u]. Since
3655 1.0 `-Z` flags have been considered unstable, and other flags that
3656 were considered unstable additionally required passing `-Z
3657 unstable-options` to access. Unlike unstable language and library
3658 features though, these options have been accessible on the stable
3659 release channel. Going forward, *new unstable flags will not be
3660 available on the stable release channel*, and old unstable flags
3661 will warn about their usage. In the future, all unstable flags will
3662 be unavailable on the stable release channel.
3663 * [It is no longer possible to `match` on empty enum variants using
3664 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3665 * The Unix-specific `MetadataExt` traits, including
3666 `os::unix::fs::MetadataExt`, which expose values such as inode
3667 numbers [no longer return platform-specific types][1.8r], but
3668 instead return widened integers. [RFC 1415].
3669 * [Modules sourced from the filesystem cannot appear within arbitrary
3670 blocks, but only within other modules][1.8mf].
3671 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3672 * On Unix, [stack overflow triggers a runtime abort instead of a
3674 * [`Command::spawn` and its equivalents return an error if any of
3675 its command-line arguments contain interior `NUL`s][1.8n].
3676 * [Tuple and unit enum variants from other crates are in the type
3678 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3679 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3680 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3681 instead of `foo.lib`.
3684 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3685 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3686 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3687 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3688 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3689 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3690 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3691 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3692 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3693 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3694 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3695 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3696 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3697 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3698 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3699 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3700 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3701 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3702 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3703 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3704 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3705 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3706 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3707 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3708 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3709 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3710 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3711 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3712 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3713 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3714 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3715 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3716 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3717 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3718 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3719 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3720 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3721 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
3722 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
3723 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
3724 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
3725 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
3726 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
3727 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
3728 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
3729 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
3730 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
3731 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
3732 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
3733 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
3734 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
3735 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
3736 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
3737 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
3738 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
3739 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
3740 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
3741 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
3742 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
3743 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
3746 Version 1.7.0 (2016-03-03)
3747 ==========================
3754 * [`Path::strip_prefix`][] (renamed from relative_from)
3755 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3757 * [`Ipv4Addr::is_loopback`]
3758 * [`Ipv4Addr::is_private`]
3759 * [`Ipv4Addr::is_link_local`]
3760 * [`Ipv4Addr::is_multicast`]
3761 * [`Ipv4Addr::is_broadcast`]
3762 * [`Ipv4Addr::is_documentation`]
3764 * [`Ipv6Addr::is_unspecified`]
3765 * [`Ipv6Addr::is_loopback`]
3766 * [`Ipv6Addr::is_multicast`]
3769 * [`Vec::as_mut_slice`]
3771 * [`String::as_str`]
3772 * [`String::as_mut_str`]
3774 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3776 * `<[T]>::`[`sort_by_key`]
3777 * checked, saturated, and overflowing operations
3778 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3779 * [`i32::saturating_mul`]
3780 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3781 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3782 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3783 * [`u32::saturating_mul`]
3784 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3785 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3786 * and checked, saturated, and overflowing operations for other primitive types
3788 * [`ffi::IntoStringError`]
3789 * [`CString::into_string`]
3790 * [`CString::into_bytes`]
3791 * [`CString::into_bytes_with_nul`]
3792 * `From<CString> for Vec<u8>`
3794 * [`IntoStringError::into_cstring`]
3795 * [`IntoStringError::utf8_error`]
3796 * `Error for IntoStringError`
3798 * [`std::hash::BuildHasher`]
3799 * [`BuildHasher::Hasher`]
3800 * [`BuildHasher::build_hasher`]
3801 * [`std::hash::BuildHasherDefault`]
3802 * [`HashMap::with_hasher`]
3803 * [`HashMap::with_capacity_and_hasher`]
3804 * [`HashSet::with_hasher`]
3805 * [`HashSet::with_capacity_and_hasher`]
3806 * [`std::collections::hash_map::RandomState`]
3807 * [`RandomState::new`]
3808 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3809 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3810 from bytes is faster.
3811 * [The performance of `LineWriter` (and thus `io::stdout`) was
3812 improved by using `memchr` to search for newlines][1.7m].
3813 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3814 `f64` variants were stabilized previously.
3815 * [`BTreeMap` was rewritten to use less memory and improve the performance
3816 of insertion and iteration, the latter by as much as 5x][1.7bm].
3817 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3818 covariant over their contained type][1.7bt].
3819 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3820 over their contained type][1.7ll].
3821 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3823 * [`Any` is implemented for unsized types][1.7a].
3824 * [`Hash` is implemented for `Duration`][1.7h].
3829 * [When running tests with `--test`, rustdoc will pass `--cfg`
3830 arguments to the compiler][1.7dt].
3831 * [The compiler is built with RPATH information by default][1.7rpa].
3832 This means that it will be possible to run `rustc` when installed in
3833 unusual configurations without configuring the dynamic linker search
3835 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3836 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3837 over `LD_LIBRARY_PATH`.
3842 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3843 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3844 * [The `rerun-if-changed` build script directive no longer causes the
3845 build script to incorrectly run twice in certain scenarios][1.7rr].
3850 * Soundness fixes to the interactions between associated types and
3851 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3852 code that violates the new rules. This is a significant change that
3853 is known to break existing code, so it has emitted warnings for the
3854 new error cases since 1.4 to give crate authors time to adapt. The
3855 details of what is changing are subtle; read the RFC for more.
3856 * [Several bugs in the compiler's visibility calculations were
3857 fixed][1.7v]. Since this was found to break significant amounts of
3858 code, the new errors will be emitted as warnings for several release
3859 cycles, under the `private_in_public` lint.
3860 * Defaulted type parameters were accidentally accepted in positions
3861 that were not intended. In this release, [defaulted type parameters
3862 appearing outside of type definitions will generate a
3863 warning][1.7d], which will become an error in future releases.
3864 * [Parsing "." as a float results in an error instead of 0][1.7p].
3865 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3866 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3868 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3869 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3870 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3871 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3872 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3873 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3874 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3875 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3876 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3877 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3878 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3879 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3880 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3881 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3882 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3883 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3884 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3885 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3886 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3887 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3888 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3889 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3890 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3891 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3892 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3893 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3894 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3895 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3896 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3897 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3898 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3899 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3900 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3901 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3902 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3903 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3904 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3905 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3906 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3907 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3908 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3909 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3910 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3911 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3912 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3913 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3914 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3915 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3916 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3917 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3918 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3919 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3920 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3921 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3922 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3923 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3924 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3925 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3926 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3927 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3928 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3929 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3930 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3931 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3932 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3933 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3934 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3935 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3936 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3937 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3938 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3939 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3940 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3941 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3942 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3943 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3944 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3945 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3946 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3949 Version 1.6.0 (2016-01-21)
3950 ==========================
3955 * The `#![no_std]` attribute causes a crate to not be linked to the
3956 standard library, but only the [core library][1.6co], as described
3957 in [RFC 1184]. The core library defines common types and traits but
3958 has no platform dependencies whatsoever, and is the basis for Rust
3959 software in environments that cannot support a full port of the
3960 standard library, such as operating systems. Most of the core
3961 library is now stable.
3967 [`Read::read_exact`],
3968 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
3969 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
3970 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
3971 [`os::unix::fs::DirBuilderExt`],
3972 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
3973 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
3974 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
3975 [`collections::hash_map::Drain`],
3976 [`collections::hash_map::HashMap::drain`],
3977 [`collections::hash_set::Drain`],
3978 [`collections::hash_set::HashSet::drain`],
3979 [`collections::binary_heap::Drain`],
3980 [`collections::binary_heap::BinaryHeap::drain`],
3981 [`Vec::extend_from_slice`][] (renamed from `push_all`),
3982 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
3983 [`RwLock::into_inner`],
3984 [`Iterator::min_by_key`][] (renamed from `min_by`),
3985 [`Iterator::max_by_key`][] (renamed from `max_by`).
3986 * The [core library][1.6co] is stable, as are most of its APIs.
3987 * [The `assert_eq!` macro supports arguments that don't implement
3988 `Sized`][1.6ae], such as arrays. In this way it behaves more like
3990 * Several timer functions that take duration in milliseconds [are
3991 deprecated in favor of those that take `Duration`][1.6ms]. These
3992 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
3993 `thread::park_timeout_ms`.
3994 * The algorithm by which `Vec` reserves additional elements was
3995 [tweaked to not allocate excessive space][1.6a] while still growing
3997 * `From` conversions are [implemented from integers to floats][1.6f]
3998 in cases where the conversion is lossless. Thus they are not
3999 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4000 or `f64`. They are also not implemented for `isize` and `usize`
4001 because the implementations would be platform-specific. `From` is
4002 also implemented from `f32` to `f64`.
4003 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4004 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4005 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4006 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4008 * Sorting slices that are already sorted [is 50% faster in some
4014 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4015 * Cargo build scripts can specify their dependencies by emitting the
4016 [`rerun-if-changed`][1.6rr] key.
4017 * crates.io will reject publication of crates with dependencies that
4018 have a wildcard version constraint. Crates with wildcard
4019 dependencies were seen to cause a variety of problems, as described
4020 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4022 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4023 release folder. A variety of artifacts that Cargo failed to clean
4024 are now correctly deleted.
4029 * The `unreachable_code` lint [warns when a function call's argument
4031 * The parser indicates [failures that may be caused by
4032 confusingly-similar Unicode characters][1.6uc]
4033 * Certain macro errors [are reported at definition time][1.6m], not
4039 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4040 environment variable when locating crates. This was a pre-cargo
4041 feature for integrating with the package manager that was
4042 accidentally never removed.
4043 * [A number of bugs were fixed in the privacy checker][1.6p] that
4044 could cause previously-accepted code to break.
4045 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4046 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4047 struct pattern syntax (`Foo(..)`) can no longer be used to match
4048 unit structs. This is a warning now, but will become an error in
4049 future releases. Patterns that share the same name as a const are
4051 * A bug was fixed that causes [rustc not to apply default type
4052 parameters][1.6xc] when resolving certain method implementations of
4053 traits defined in other crates.
4055 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4056 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4057 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4058 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4059 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4060 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
4061 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4062 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4063 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4064 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4065 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4066 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4067 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4068 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4069 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4070 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4071 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4072 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4073 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4074 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4075 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4076 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4077 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4078 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4079 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4080 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4081 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4082 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4083 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4084 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4085 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4086 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4087 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4088 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4089 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4090 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4091 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4092 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4093 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4094 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4095 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4096 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4097 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4098 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4099 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4100 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4101 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4104 Version 1.5.0 (2015-12-10)
4105 ==========================
4107 * ~700 changes, numerous bugfixes
4113 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4114 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4115 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4116 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4117 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4118 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4119 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4120 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4121 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4122 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4123 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4124 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4125 [`Path::read_link`], [`Path::symlink_metadata`],
4126 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4127 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4128 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4129 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4130 [`slice::split_first_mut`], [`slice::split_first`],
4131 [`slice::split_last_mut`], [`slice::split_last`],
4132 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4133 [`str::MatchIndices`], [`str::RMatchIndices`],
4134 [`str::match_indices`], [`str::rmatch_indices`],
4135 [`str::slice_mut_unchecked`], [`string::ParseError`].
4136 * Rust applications hosted on crates.io can be installed locally to
4137 `~/.cargo/bin` with the [`cargo install`] command. Among other
4138 things this makes it easier to augment Cargo with new subcommands:
4139 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4140 invoked as `cargo foo`.
4141 * Crates with wildcard (`*`) dependencies will [emit warnings when
4142 published][1.5w]. In 1.6 it will no longer be possible to publish
4143 crates with wildcard dependencies.
4148 * The rules determining when a particular lifetime must outlive
4149 a particular value (known as '[dropck]') have been [modified
4150 to not rely on parametricity][1.5p].
4151 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4152 and `Arc`][1.5a]. Because these smart pointer types implement
4153 `Deref`, this causes breakage in cases where the interior type
4154 contains methods of the same name.
4155 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4156 that they could drop their content. Soundness fix.
4157 * All method invocations are [properly checked][1.5wf1] for
4158 [well-formedness][1.5wf2]. Soundness fix.
4159 * Traits whose supertraits contain `Self` are [not object
4160 safe][1.5o]. Soundness fix.
4161 * Target specifications support a [`no_default_libraries`][1.5nd]
4162 setting that controls whether `-nodefaultlibs` is passed to the
4163 linker, and in turn the `is_like_windows` setting no longer affects
4164 the `-nodefaultlibs` flag.
4165 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4166 * The `#[inline]` and `#[repr]` attributes [can only appear
4167 in valid locations][1.5at].
4168 * Native libraries linked from the local crate are [passed to
4169 the linker before native libraries from upstream crates][1.5nl].
4170 * Two rarely-used attributes, `#[no_debug]` and
4171 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4172 * Negation of unsigned integers, which has been a warning for
4173 several releases, [is now behind a feature gate and will
4174 generate errors][1.5nu].
4175 * The parser accidentally accepted visibility modifiers on
4176 enum variants, a bug [which has been fixed][1.5ev].
4177 * [A bug was fixed that allowed `use` statements to import unstable
4183 * When evaluating expressions at compile-time that are not
4184 compile-time constants (const-evaluating expressions in non-const
4185 contexts), incorrect code such as overlong bitshifts and arithmetic
4186 overflow will [generate a warning instead of an error][1.5ce],
4187 delaying the error until runtime. This will allow the
4188 const-evaluator to be expanded in the future backwards-compatibly.
4189 * The `improper_ctypes` lint [no longer warns about using `isize` and
4190 `usize` in FFI][1.5ict].
4195 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4197 * `Default` is [implemented for mutable slices][1.5d].
4198 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4199 * There are now `From` conversions [between floating point
4200 types][1.5f] where the conversions are lossless.
4201 * There are now `From` conversions [between integer types][1.5i] where
4202 the conversions are lossless.
4203 * [`fs::Metadata` implements `Clone`][1.5fs].
4204 * The `parse` method [accepts a leading "+" when parsing
4206 * [`AsMut` is implemented for `Vec`][1.5am].
4207 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4208 been optimized][1.5cf] and no longer rely on the default impl.
4209 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4210 `unsafe extern "C"` function types now [implement `Clone`,
4211 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4212 `fmt::Debug` for up to 12 arguments][1.5fp].
4213 * [Dropping `Vec`s is much faster in unoptimized builds when the
4214 element types don't implement `Drop`][1.5dv].
4215 * A bug that caused in incorrect behavior when [combining `VecDeque`
4216 with zero-sized types][1.5vdz] was resolved.
4217 * [`PartialOrd` for slices is faster][1.5po].
4222 * [Crate metadata size was reduced by 20%][1.5md].
4223 * [Improvements to code generation reduced the size of libcore by 3.3
4224 MB and rustc's memory usage by 18MB][1.5m].
4225 * [Improvements to deref translation increased performance in
4226 unoptimized builds][1.5dr].
4227 * Various errors in trait resolution [are deduplicated to only be
4228 reported once][1.5te].
4229 * Rust has preliminary [support for rumprun kernels][1.5rr].
4230 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4232 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4233 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4234 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4235 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4236 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4237 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4238 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4239 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4240 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4241 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4242 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4243 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4244 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4245 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4246 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4247 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4248 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4249 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4250 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4251 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4252 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4253 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4254 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4255 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4256 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4257 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4258 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4259 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4260 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4261 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4262 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4263 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4264 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4265 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4266 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4267 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4268 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4269 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4270 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4271 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4272 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4273 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4274 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4275 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4276 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4277 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4278 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4279 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4280 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4281 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4282 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4283 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4284 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4285 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4286 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4287 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4288 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4289 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4290 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4291 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4292 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4293 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4294 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4295 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4296 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4297 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4298 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4299 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4300 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4301 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4302 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4303 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4304 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4305 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4306 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4307 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4308 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4309 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4310 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4311 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4312 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4313 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4314 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4315 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4316 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4317 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4318 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4319 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4320 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4322 Version 1.4.0 (2015-10-29)
4323 ==========================
4325 * ~1200 changes, numerous bugfixes
4330 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4331 GNU) are now supported and recommended for use.
4336 * [Several changes have been made to fix type soundness and improve
4337 the behavior of associated types][sound]. See [RFC 1214]. Although
4338 we have mostly introduced these changes as warnings this release, to
4339 become errors next release, there are still some scenarios that will
4340 see immediate breakage.
4341 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4342 line breaks in addition to `\n`][crlf].
4343 * [Loans of `'static` lifetime extend to the end of a function][stat].
4344 * [`str::parse` no longer introduces avoidable rounding error when
4345 parsing floating point numbers. Together with earlier changes to
4346 float formatting/output, "round trips" like f.to_string().parse()
4347 now preserve the value of f exactly. Additionally, leading plus
4348 signs are now accepted][fp3].
4354 * `use` statements that import multiple items [can now rename
4355 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4356 * [Binops work correctly on fat pointers][binfat].
4357 * `pub extern crate`, which does not behave as expected, [issues a
4358 warning][pec] until a better solution is found.
4363 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4364 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4365 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4366 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4367 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4368 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4369 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4370 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4371 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4372 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4373 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4374 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4375 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4376 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4377 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4378 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4379 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4380 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4382 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4383 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4384 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4385 `f64::from_str_radix`.
4386 * [Reverse-searching strings is faster with the 'two-way'
4388 * [`std::io::copy` allows `?Sized` arguments][cc].
4389 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4390 [override `count`, `nth` and `last` with an O(1)
4391 implementation][it].
4392 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4393 * [`IntoRawFd` has been added to the Unix-specific prelude,
4394 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4396 * [`Extend<String>` and `FromIterator<String` are both implemented for
4398 * [`IntoIterator` is implemented for references to `Option` and
4400 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4401 Copy`][ext] as part of [RFC 839]. This will cause type inference
4402 breakage in rare situations.
4403 * [`BinaryHeap` implements `Debug`][bh2].
4404 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4406 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4407 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4408 * [String comparison is faster][faststr].
4409 * `&mut T` where `T: std::fmt::Write` [also implements
4410 `std::fmt::Write`][mutw].
4411 * [A stable regression in `VecDeque::push_back` and other
4412 capacity-altering methods that caused panics for zero-sized types
4414 * [Function pointers implement traits for up to 12 parameters][fp2].
4419 * The compiler [no longer uses the 'morestack' feature to prevent
4420 stack overflow][mm]. Instead it uses guard pages and stack
4421 probes (though stack probes are not yet implemented on any platform
4423 * [The compiler matches traits faster when projections are involved][p].
4424 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4426 * [Cargo now displays useful information about what its doing during
4427 `cargo update`][cu].
4429 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4430 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4431 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4432 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4433 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4434 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4435 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4436 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4437 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4438 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4439 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4440 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4441 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4442 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4443 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4444 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4445 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4446 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4447 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4448 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4449 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4450 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4451 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4452 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4453 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4454 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4455 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4456 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4457 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4458 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4459 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4460 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4461 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4462 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4463 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4464 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4465 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4466 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4467 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4468 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4469 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4470 [bh2]: https://github.com/rust-lang/rust/pull/28156
4471 [binfat]: https://github.com/rust-lang/rust/pull/28270
4472 [bm]: https://github.com/rust-lang/rust/pull/28197
4473 [cc]: https://github.com/rust-lang/rust/pull/27531
4474 [crlf]: https://github.com/rust-lang/rust/pull/28034
4475 [cu]: https://github.com/rust-lang/cargo/pull/1931
4476 [d]: https://github.com/rust-lang/rust/pull/27825
4477 [dep]: https://github.com/rust-lang/rust/pull/28339
4478 [es]: https://github.com/rust-lang/rust/pull/27956
4479 [ext]: https://github.com/rust-lang/rust/pull/28094
4480 [faststr]: https://github.com/rust-lang/rust/pull/28338
4481 [ffi]: https://github.com/rust-lang/rust/pull/28779
4482 [fp]: https://github.com/rust-lang/rust/pull/28268
4483 [fp2]: https://github.com/rust-lang/rust/pull/28560
4484 [fp3]: https://github.com/rust-lang/rust/pull/27307
4485 [i]: https://github.com/rust-lang/rust/pull/27451
4486 [into2]: https://github.com/rust-lang/rust/pull/28039
4487 [it]: https://github.com/rust-lang/rust/pull/27652
4488 [mm]: https://github.com/rust-lang/rust/pull/27338
4489 [mutw]: https://github.com/rust-lang/rust/pull/28368
4490 [sound]: https://github.com/rust-lang/rust/pull/27641
4491 [p]: https://github.com/rust-lang/rust/pull/27866
4492 [pec]: https://github.com/rust-lang/rust/pull/28486
4493 [pr]: https://github.com/rust-lang/rust/pull/27896
4494 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4495 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4496 [s]: https://github.com/rust-lang/rust/pull/27474
4497 [stab]: https://github.com/rust-lang/rust/pull/28339
4498 [stat]: https://github.com/rust-lang/rust/pull/28321
4499 [vd]: https://github.com/rust-lang/rust/pull/28494
4501 Version 1.3.0 (2015-09-17)
4502 ==============================
4504 * ~900 changes, numerous bugfixes
4509 * The [new object lifetime defaults][nold] have been [turned
4510 on][nold2] after a cycle of warnings about the change. Now types
4511 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4512 being interpreted as `&'a Box<Trait+'a>` to `&'a
4513 Box<Trait+'static>`.
4514 * [The Rustonomicon][nom] is a new book in the official documentation
4515 that dives into writing unsafe Rust.
4516 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4517 timekeeping is employed by other std APIs, as well as out-of-tree
4523 * The [new object lifetime defaults][nold] have been [turned
4524 on][nold2] after a cycle of warnings about the change.
4525 * There is a known [regression][lr] in how object lifetime elision is
4526 interpreted, the proper solution for which is undetermined.
4527 * The `#[prelude_import]` attribute, an internal implementation
4528 detail, was accidentally stabilized previously. [It has been put
4529 behind the `prelude_import` feature gate][pi]. This change is
4530 believed to break no existing code.
4531 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4532 [more sane for dynamically sized types][dst3]. Code that relied on
4533 the previous behavior is thought to be broken.
4534 * The `dropck` rules, which checks that destructors can't access
4535 destroyed values, [have been updated][dropck] to match the
4536 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4537 cause some previously-compiling code to no longer build.
4542 * The [new object lifetime defaults][nold] have been [turned
4543 on][nold2] after a cycle of warnings about the change.
4544 * Semicolons may [now follow types and paths in
4545 macros](https://github.com/rust-lang/rust/pull/27000).
4546 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4547 [more sane for dynamically sized types][dst3]. Code that relied on
4548 the previous behavior is not known to exist, and suspected to be
4550 * `'static` variables [may now be recursive][st].
4551 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4552 implementations correctly.
4553 * The `dropck` rules, which checks that destructors can't access
4554 destroyed values, [have been updated][dropck] to match the
4560 * The [`Duration`] API, [has been stabilized][ds], as well as the
4561 `std::time` module, which presently contains only `Duration`.
4562 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4563 * The owned C string, [`CString`], implements [`Borrow`] and the
4564 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4565 these allow C strings to be borrowed and cloned in generic code.
4566 * [`CStr`] implements [`Debug`].
4567 * [`AtomicPtr`] implements [`Debug`].
4568 * [`Error`] trait objects [can be downcast to their concrete types][e]
4569 in many common configurations, using the [`is`], [`downcast`],
4570 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4572 * Searching for substrings now [employs the two-way algorithm][search]
4573 instead of doing a naive search. This gives major speedups to a
4574 number of methods, including [`contains`][sc], [`find`][sf],
4575 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4576 [`ends_with`][sew] are also faster.
4577 * The performance of `PartialEq` for slices is [much faster][ps].
4578 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4579 is overridden and optimized by the implementations for scalars.
4580 * The [`Hasher`] trait now has a number of specialized `write_*`
4581 methods for primitive types, for efficiency.
4582 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4583 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4584 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4585 of [`std::error::Error::cause`][iec] also delegates to the inner
4587 * [`process::Child`][pc] gained the [`id`] method, which returns a
4588 `u32` representing the platform-specific process identifier.
4589 * The [`connect`] method on slices is deprecated, replaced by the new
4590 [`join`] method (note that both of these are on the *unstable*
4591 [`SliceConcatExt`] trait, but through the magic of the prelude are
4592 available to stable code anyway).
4593 * The [`Div`] operator is implemented for [`Wrapping`] types.
4594 * [`DerefMut` is implemented for `String`][dms].
4595 * Performance of SipHash (the default hasher for `HashMap`) is
4596 [better for long data][sh].
4597 * [`AtomicPtr`] implements [`Send`].
4598 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4599 are now [specialized to use uninitialized buffers for increased
4601 * Lifetime parameters of foreign functions [are now resolved
4607 * Rust can now, with some coercion, [produce programs that run on
4608 Windows XP][xp], though XP is not considered a supported platform.
4609 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4610 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4611 recommended for use in 1.3, though should be fully-functional
4612 in the [64-bit 1.4 beta][b14].
4613 * On Fedora-based systems installation will [properly configure the
4614 dynamic linker][fl].
4615 * The compiler gained many new extended error descriptions, which can
4616 be accessed with the `--explain` flag.
4617 * The `dropck` pass, which checks that destructors can't access
4618 destroyed values, [has been rewritten][dropck]. This fixes some
4619 soundness holes, and as such will cause some previously-compiling
4620 code to no longer build.
4621 * `rustc` now uses [LLVM to write archive files where possible][ar].
4622 Eventually this will eliminate the compiler's dependency on the ar
4624 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4625 supported FreeBSD on x86_64).
4626 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4627 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4629 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4630 will kill the process instead of leaking][nlp].
4632 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4633 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4634 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4635 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4636 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4637 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4638 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4639 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4640 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4641 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4642 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4643 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4644 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4645 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4646 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4647 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4648 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4649 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4650 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4651 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4652 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4653 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4654 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4655 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4656 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4657 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4658 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4659 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4660 [ar]: https://github.com/rust-lang/rust/pull/26926
4661 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4662 [dms]: https://github.com/rust-lang/rust/pull/26241
4663 [dropck]: https://github.com/rust-lang/rust/pull/27261
4664 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4665 [ds]: https://github.com/rust-lang/rust/pull/26818
4666 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4667 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4668 [dst3]: https://github.com/rust-lang/rust/pull/27351
4669 [e]: https://github.com/rust-lang/rust/pull/24793
4670 [f]: https://github.com/rust-lang/rust/pull/26588
4671 [fb]: https://github.com/rust-lang/rust/pull/26959
4672 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4673 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4674 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4675 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4676 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4677 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4678 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4679 [lic]: https://github.com/rust-lang/rust/pull/26583
4680 [lnu]: https://github.com/rust-lang/rust/pull/27026
4681 [lr]: https://github.com/rust-lang/rust/issues/27248
4682 [lum]: https://github.com/rust-lang/rust/pull/26378
4683 [lur]: https://github.com/rust-lang/rust/pull/26783
4684 [nlp]: https://github.com/rust-lang/rust/pull/27176
4685 [nold2]: https://github.com/rust-lang/rust/pull/27045
4686 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4687 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4688 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4689 [pi]: https://github.com/rust-lang/rust/pull/26699
4690 [ps]: https://github.com/rust-lang/rust/pull/26884
4691 [rte]: https://github.com/rust-lang/rust/pull/26950
4692 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4693 [search]: https://github.com/rust-lang/rust/pull/26327
4694 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4695 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4696 [sh]: https://github.com/rust-lang/rust/pull/27280
4697 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4698 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4699 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4700 [st]: https://github.com/rust-lang/rust/pull/26630
4701 [win1]: https://github.com/rust-lang/rust/pull/26569
4702 [win2]: https://github.com/rust-lang/rust/pull/26741
4703 [win3]: https://github.com/rust-lang/rust/pull/26741
4704 [win4]: https://github.com/rust-lang/rust/pull/27210
4705 [xp]: https://github.com/rust-lang/rust/pull/26569
4707 Version 1.2.0 (2015-08-07)
4708 ==========================
4710 * ~1200 changes, numerous bugfixes
4715 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4716 like `Rc` to contain types without a fixed size, arrays and trait
4717 objects, finally enabling use of `Rc<[T]>` and completing the
4718 implementation of DST.
4719 * [Parallel codegen][parcodegen] is now working again, which can
4720 substantially speed up large builds in debug mode; It also gets
4721 another ~33% speedup when bootstrapping on a 4 core machine (using 8
4722 jobs). It's not enabled by default, but will be "in the near
4723 future". It can be activated with the `-C codegen-units=N` flag to
4725 * This is the first release with [experimental support for linking
4726 with the MSVC linker and lib C on Windows (instead of using the GNU
4727 variants via MinGW)][win]. It is yet recommended only for the most
4728 intrepid Rustaceans.
4729 * Benchmark compilations are showing a 30% improvement in
4730 bootstrapping over 1.1.
4735 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
4736 unicode case mapping, which is a previously-planned change in
4737 behavior and considered a bugfix.
4738 * [`mem::align_of`] now specifies [the *minimum alignment* for
4739 T][align], which is usually the alignment programs are interested
4740 in, and the same value reported by clang's
4741 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
4743 * [The `#[packed]` attribute is no longer silently accepted by the
4744 compiler][packed]. This attribute did nothing and code that
4745 mentioned it likely did not work as intended.
4746 * Associated type defaults are [now behind the
4747 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
4748 defaults *did not work*, but could be mentioned syntactically. As
4749 such this breakage has minimal impact.
4754 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4755 matching against dereferencable values.
4760 * The [`Extend`] trait, which grows a collection from an iterator, is
4761 implemented over iterators of references, for `String`, `Vec`,
4762 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4763 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4764 * The [`iter::once`] function returns an iterator that yields a single
4765 element, and [`iter::empty`] returns an iterator that yields no
4767 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4768 over substring matches.
4769 * [`Cell`] and [`RefCell`] both implement `Eq`.
4770 * A number of methods for wrapping arithmetic are added to the
4771 integral types, [`wrapping_div`], [`wrapping_rem`],
4772 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4773 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4774 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4775 type.. It is illegal for the default arithmetic operations in Rust
4776 to overflow; the desire to wrap must be explicit.
4777 * The `{:#?}` formatting specifier [displays the alternate,
4778 pretty-printed][debugfmt] form of the `Debug` formatter. This
4779 feature was actually introduced prior to 1.0 with little
4781 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4782 for writing data to formatted strings, similar to [`io::Write`].
4783 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4784 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4785 are used by code generators to emit implementations of [`Debug`].
4786 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4787 methods that convert case, following Unicode case mapping.
4788 * It is now easier to handle poisoned locks. The [`PoisonError`]
4789 type, returned by failing lock operations, exposes `into_inner`,
4790 `get_ref`, and `get_mut`, which all give access to the inner lock
4791 guard, and allow the poisoned lock to continue to operate. The
4792 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4793 poisoned lock without attempting to take the lock.
4794 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4795 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4796 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4797 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4799 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4805 * `rustc` employs smarter heuristics for guessing at [typos].
4806 * `rustc` emits more efficient code for [no-op conversions between
4807 unsafe pointers][nop].
4808 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4809 resulting in faster compile times and smaller code.
4811 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4812 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4813 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4814 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4815 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4816 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4817 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4818 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4819 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4820 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4821 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4822 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4823 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4824 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4825 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4826 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4827 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4828 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4829 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4830 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4831 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4832 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4833 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4834 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4835 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4836 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4837 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4838 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4839 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4840 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4841 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4842 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4843 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4844 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4845 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4846 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4847 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4848 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4849 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4850 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4851 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4852 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4853 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4854 [align]: https://github.com/rust-lang/rust/pull/25646
4855 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4856 [typos]: https://github.com/rust-lang/rust/pull/26087
4857 [nop]: https://github.com/rust-lang/rust/pull/26336
4858 [fat]: https://github.com/rust-lang/rust/pull/26411
4859 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4860 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4861 [packed]: https://github.com/rust-lang/rust/pull/25541
4862 [ad]: https://github.com/rust-lang/rust/pull/27382
4863 [win]: https://github.com/rust-lang/rust/pull/25350
4865 Version 1.1.0 (2015-06-25)
4866 =========================
4868 * ~850 changes, numerous bugfixes
4873 * The [`std::fs` module has been expanded][fs] to expand the set of
4874 functionality exposed:
4875 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4876 don't incur a syscall on some platforms.
4877 * A `symlink_metadata` function has been added.
4878 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4879 access to all underlying information.
4880 * The compiler now contains extended explanations of many errors. When an error
4881 with an explanation occurs the compiler suggests using the `--explain` flag
4882 to read the explanation. Error explanations are also [available online][err-index].
4883 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4884 well as other work, the time to bootstrap the compiler decreased by
4890 * The [`str::split_whitespace`] method splits a string on unicode
4891 whitespace boundaries.
4892 * On both Windows and Unix, new extension traits provide conversion of
4893 I/O types to and from the underlying system handles. On Unix, these
4894 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4895 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4896 `TcpListener`, and `UpdSocket`. Further implementations for
4897 `std::process` will be stabilized later.
4898 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4899 Windows, symlinks can be created with
4900 `std::os::windows::symlink_dir` and
4901 `std::os::windows::symlink_file`.
4902 * The `mpsc::Receiver` type can now be converted into an iterator with
4903 `into_iter` on the [`IntoIterator`] trait.
4904 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4905 implementation of the [`From`] trait.
4906 * The `Debug` implementation for `RangeFull` [creates output that is
4907 more consistent with other implementations][rf].
4908 * [`Debug` is implemented for `File`][file].
4909 * The `Default` implementation for `Arc` [no longer requires `Sync +
4911 * [The `Iterator` methods `count`, `nth`, and `last` have been
4912 overridden for slices to have O(1) performance instead of O(n)][si].
4913 * Incorrect handling of paths on Windows has been improved in both the
4914 compiler and the standard library.
4915 * [`AtomicPtr` gained a `Default` implementation][ap].
4916 * In accordance with Rust's policy on arithmetic overflow `abs` now
4917 [panics on overflow when debug assertions are enabled][abs].
4918 * The [`Cloned`] iterator, which was accidentally left unstable for
4919 1.0 [has been stabilized][c].
4920 * The [`Incoming`] iterator, which iterates over incoming TCP
4921 connections, and which was accidentally unnamable in 1.0, [is now
4922 properly exported][inc].
4923 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4924 `sift_up` or `sift_down` panic][bh].
4925 * The [`split_off`] method of `LinkedList` [no longer corrupts
4926 the list in certain scenarios][ll].
4931 * Type checking performance [has improved notably][sk] with
4932 [multiple improvements][pre].
4933 * The compiler [suggests code changes][ch] for more errors.
4934 * rustc and it's build system have experimental support for [building
4935 toolchains against MUSL][m] instead of glibc on Linux.
4936 * The compiler defines the `target_env` cfg value, which is used for
4937 distinguishing toolchains that are otherwise for the same
4938 platform. Presently this is set to `gnu` for common GNU Linux
4939 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4940 * The [`cargo rustc`][crc] command invokes a build with custom flags
4942 * [Android executables are always position independent][pie].
4943 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4946 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4947 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4948 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4949 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4950 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4951 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4952 [rf]: https://github.com/rust-lang/rust/pull/24491
4953 [err-index]: https://doc.rust-lang.org/error-index.html
4954 [sk]: https://github.com/rust-lang/rust/pull/24615
4955 [pre]: https://github.com/rust-lang/rust/pull/25323
4956 [file]: https://github.com/rust-lang/rust/pull/24598
4957 [ch]: https://github.com/rust-lang/rust/pull/24683
4958 [arc]: https://github.com/rust-lang/rust/pull/24695
4959 [si]: https://github.com/rust-lang/rust/pull/24701
4960 [ap]: https://github.com/rust-lang/rust/pull/24834
4961 [m]: https://github.com/rust-lang/rust/pull/24777
4962 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
4963 [crc]: https://github.com/rust-lang/cargo/pull/1568
4964 [pie]: https://github.com/rust-lang/rust/pull/24953
4965 [abs]: https://github.com/rust-lang/rust/pull/25441
4966 [c]: https://github.com/rust-lang/rust/pull/25496
4967 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
4968 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
4969 [inc]: https://github.com/rust-lang/rust/pull/25522
4970 [bh]: https://github.com/rust-lang/rust/pull/25856
4971 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
4972 [ll]: https://github.com/rust-lang/rust/pull/26022
4973 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
4974 [drop]: https://github.com/rust-lang/rust/pull/24935
4976 Version 1.0.0 (2015-05-15)
4977 ========================
4979 * ~1500 changes, numerous bugfixes
4984 * The vast majority of the standard library is now `#[stable]`. It is
4985 no longer possible to use unstable features with a stable build of
4987 * Many popular crates on [crates.io] now work on the stable release
4989 * Arithmetic on basic integer types now [checks for overflow in debug
4995 * Several [restrictions have been added to trait coherence][coh] in
4996 order to make it easier for upstream authors to change traits
4997 without breaking downstream code.
4998 * Digits of binary and octal literals are [lexed more eagerly][lex] to
4999 improve error messages and macro behavior. For example, `0b1234` is
5000 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5001 * Trait bounds [are always invariant][inv], eliminating the need for
5002 the `PhantomFn` and `MarkerTrait` lang items, which have been
5004 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5005 "foo" as bar` syntax has been replaced with `extern crate foo as
5006 bar`, and Cargo now automatically translates "-" in *package* names
5007 to underscore for the crate name.
5008 * [Lifetime shadowing is an error][lt].
5009 * [`Send` no longer implies `'static`][send-rfc].
5010 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5011 `MyType::default()`.
5012 * Primitive types [now have inherent methods][prim-inherent],
5013 obviating the need for extension traits like `SliceExt`.
5014 * Methods with `Self: Sized` in their `where` clause are [considered
5015 object-safe][self-sized], allowing many extension traits like
5016 `IteratorExt` to be merged into the traits they extended.
5017 * You can now [refer to associated types][assoc-where] whose
5018 corresponding trait bounds appear only in a `where` clause.
5019 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5020 like `Send` and `Sync` are now library-defined.
5021 * A [Reflect trait][reflect] was introduced, which means that
5022 downcasting via the `Any` trait is effectively limited to concrete
5023 types. This helps retain the potentially-important "parametricity"
5024 property: generic code cannot behave differently for different type
5025 arguments except in minor ways.
5026 * The `unsafe_destructor` feature is now deprecated in favor of the
5027 [new `dropck`][dropck]. This change is a major reduction in unsafe
5033 * The `thread_local` module [has been renamed to `std::thread`][th].
5034 * The methods of `IteratorExt` [have been moved to the `Iterator`
5036 * Several traits that implement Rust's conventions for type
5037 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5038 [centralized in the `std::convert` module][con].
5039 * The `FromError` trait [was removed in favor of `From`][fe].
5040 * The basic sleep function [has moved to
5041 `std::thread::sleep_ms`][slp].
5042 * The `splitn` function now takes an `n` parameter that represents the
5043 number of items yielded by the returned iterator [instead of the
5044 number of 'splits'][spl].
5045 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5046 * [Derived implementations of `PartialOrd` now order enums according
5047 to their explicitly-assigned discriminants][po].
5048 * [Methods for searching strings are generic over `Pattern`s][pat],
5049 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5051 * [In method resolution, object methods are resolved before inherent
5053 * [`String::from_str` has been deprecated in favor of the `From` impl,
5054 `String::from`][sf].
5055 * [`io::Error` implements `Sync`][ios].
5056 * [The `words` method on `&str` has been replaced with
5057 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5059 * The new path and IO modules are complete and `#[stable]`. This
5060 was the major library focus for this cycle.
5061 * The path API was [revised][path-normalize] to normalize `.`,
5062 adjusting the tradeoffs in favor of the most common usage.
5063 * A large number of remaining APIs in `std` were also stabilized
5064 during this cycle; about 75% of the non-deprecated API surface
5066 * The new [string pattern API][string-pattern] landed, which makes
5067 the string slice API much more internally consistent and flexible.
5068 * A new set of [generic conversion traits][conversion] replaced
5069 many existing ad hoc traits.
5070 * Generic numeric traits were [completely removed][num-traits]. This
5071 was made possible thanks to inherent methods for primitive types,
5072 and the removal gives maximal flexibility for designing a numeric
5073 hierarchy in the future.
5074 * The `Fn` traits are now related via [inheritance][fn-inherit]
5075 and provide ergonomic [blanket implementations][fn-blanket].
5076 * The `Index` and `IndexMut` traits were changed to
5077 [take the index by value][index-value], enabling code like
5078 `hash_map["string"]` to work.
5079 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5080 `Copy` data is known to be `Clone` as well.
5085 * Many errors now have extended explanations that can be accessed with
5086 the `--explain` flag to `rustc`.
5087 * Many new examples have been added to the standard library
5089 * rustdoc has received a number of improvements focused on completion
5091 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5092 * Much headway was made on ecosystem-wide CI, making it possible
5093 to [compare builds for breakage][ci-compare].
5096 [crates.io]: http://crates.io
5097 [clo]: https://github.com/rust-lang/rust/pull/24034
5098 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5099 [con]: https://github.com/rust-lang/rust/pull/23875
5100 [cr]: https://github.com/rust-lang/rust/pull/23419
5101 [fe]: https://github.com/rust-lang/rust/pull/23879
5102 [ie]: https://github.com/rust-lang/rust/pull/23300
5103 [inv]: https://github.com/rust-lang/rust/pull/23938
5104 [ios]: https://github.com/rust-lang/rust/pull/24133
5105 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5106 [lt]: https://github.com/rust-lang/rust/pull/24057
5107 [meth]: https://github.com/rust-lang/rust/pull/24056
5108 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5109 [po]: https://github.com/rust-lang/rust/pull/24270
5110 [sf]: https://github.com/rust-lang/rust/pull/24517
5111 [slp]: https://github.com/rust-lang/rust/pull/23949
5112 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5113 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5114 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5115 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5116 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5117 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5118 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5119 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5120 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5121 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5122 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5123 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5124 [reflect]: https://github.com/rust-lang/rust/pull/23712
5125 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5126 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5127 [index-value]: https://github.com/rust-lang/rust/pull/23601
5128 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5129 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5130 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5131 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5132 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5133 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5136 Version 1.0.0-alpha.2 (2015-02-20)
5137 =====================================
5139 * ~1300 changes, numerous bugfixes
5143 * The various I/O modules were [overhauled][io-rfc] to reduce
5144 unnecessary abstractions and provide better interoperation with
5145 the underlying platform. The old `io` module remains temporarily
5147 * The standard library now [participates in feature gating][feat],
5148 so use of unstable libraries now requires a `#![feature(...)]`
5149 attribute. The impact of this change is [described on the
5150 forum][feat-forum]. [RFC][feat-rfc].
5154 * `for` loops [now operate on the `IntoIterator` trait][into],
5155 which eliminates the need to call `.iter()`, etc. to iterate
5156 over collections. There are some new subtleties to remember
5157 though regarding what sort of iterators various types yield, in
5158 particular that `for foo in bar { }` yields values from a move
5159 iterator, destroying the original collection. [RFC][into-rfc].
5160 * Objects now have [default lifetime bounds][obj], so you don't
5161 have to write `Box<Trait+'static>` when you don't care about
5162 storing references. [RFC][obj-rfc].
5163 * In types that implement `Drop`, [lifetimes must outlive the
5164 value][drop]. This will soon make it possible to safely
5165 implement `Drop` for types where `#[unsafe_destructor]` is now
5166 required. Read the [gorgeous RFC][drop-rfc] for details.
5167 * The fully qualified <T as Trait>::X syntax lets you set the Self
5168 type for a trait method or associated type. [RFC][ufcs-rfc].
5169 * References to types that implement `Deref<U>` now [automatically
5170 coerce to references][deref] to the dereferenced type `U`,
5171 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5172 should eliminate many unsightly uses of `&*`, as when converting
5173 from references to vectors into references to
5174 slices. [RFC][deref-rfc].
5175 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5176 `|:|`) is obsolete and closure kind is inferred from context.
5177 * [`Self` is a keyword][Self].
5181 * The `Show` and `String` formatting traits [have been
5182 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5183 their related purposes. Automatically getting a string
5184 conversion to use with `format!("{:?}", something_to_debug)` is
5185 now written `#[derive(Debug)]`.
5186 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5187 OsStr}`, provide strings in platform-specific encodings for easier
5188 interop with system APIs. [RFC][osstr-rfc].
5189 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5190 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5191 creating raw pointers.
5195 * Certain long error messages of the form 'expected foo found bar'
5196 are now [split neatly across multiple
5197 lines][multiline]. Examples in the PR.
5198 * On Unix Rust can be [uninstalled][un] by running
5199 `/usr/local/lib/rustlib/uninstall.sh`.
5200 * The `#[rustc_on_unimplemented]` attribute, requiring the
5201 'on_unimplemented' feature, lets rustc [display custom error
5202 messages when a trait is expected to be implemented for a type
5207 * Rust is tested against a [LALR grammar][lalr], which parses
5208 almost all the Rust files that rustc does.
5210 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5211 [close]: https://github.com/rust-lang/rust/pull/21843
5212 [deref]: https://github.com/rust-lang/rust/pull/21351
5213 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5214 [drop]: https://github.com/rust-lang/rust/pull/21972
5215 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5216 [feat]: https://github.com/rust-lang/rust/pull/21248
5217 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5218 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5219 [fmt]: https://github.com/rust-lang/rust/pull/21457
5220 [into]: https://github.com/rust-lang/rust/pull/20790
5221 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5222 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5223 [lalr]: https://github.com/rust-lang/rust/pull/21452
5224 [multiline]: https://github.com/rust-lang/rust/pull/19870
5225 [obj]: https://github.com/rust-lang/rust/pull/22230
5226 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5227 [onun]: https://github.com/rust-lang/rust/pull/20889
5228 [osstr]: https://github.com/rust-lang/rust/pull/21488
5229 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5230 [Self]: https://github.com/rust-lang/rust/pull/22158
5231 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5232 [un]: https://github.com/rust-lang/rust/pull/22256
5235 Version 1.0.0-alpha (2015-01-09)
5236 ==================================
5238 * ~2400 changes, numerous bugfixes
5242 * The language itself is considered feature complete for 1.0,
5243 though there will be many usability improvements and bugfixes
5244 before the final release.
5245 * Nearly 50% of the public API surface of the standard library has
5246 been declared 'stable'. Those interfaces are unlikely to change
5248 * The long-running debate over integer types has been
5249 [settled][ints]: Rust will ship with types named `isize` and
5250 `usize`, rather than `int` and `uint`, for pointer-sized
5251 integers. Guidelines will be rolled out during the alpha cycle.
5252 * Most crates that are not `std` have been moved out of the Rust
5253 distribution into the Cargo ecosystem so they can evolve
5254 separately and don't need to be stabilized as quickly, including
5255 'time', 'getopts', 'num', 'regex', and 'term'.
5256 * Documentation continues to be expanded with more API coverage, more
5257 examples, and more in-depth explanations. The guides have been
5258 consolidated into [The Rust Programming Language][trpl].
5259 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5260 * All official Rust binary installers now come with [Cargo], the
5261 Rust package manager.
5265 * Closures have been [completely redesigned][unboxed] to be
5266 implemented in terms of traits, can now be used as generic type
5267 bounds and thus monomorphized and inlined, or via an opaque
5268 pointer (boxed) as in the old system. The new system is often
5269 referred to as 'unboxed' closures.
5270 * Traits now support [associated types][assoc], allowing families
5271 of related types to be defined together and used generically in
5273 * Enum variants are [namespaced by their type names][enum].
5274 * [`where` clauses][where] provide a more versatile and attractive
5275 syntax for specifying generic bounds, though the previous syntax
5277 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5279 * Rust [no longer has a runtime][rt] of any description, and only
5280 supports OS threads, not green threads.
5281 * At long last, Rust has been overhauled for 'dynamically-sized
5282 types' ([DST]), which integrates 'fat pointers' (object types,
5283 arrays, and `str`) more deeply into the type system, making it
5285 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5286 `..j` that produce range types and which, when combined with the
5287 `Index` operator and multidispatch, leads to a convenient slice
5289 * The new range syntax revealed an ambiguity in the fixed-length
5290 array syntax, so now fixed length arrays [are written `[T;
5292 * The `Copy` trait is no longer implemented automatically. Unsafe
5293 pointers no longer implement `Sync` and `Send` so types
5294 containing them don't automatically either. `Sync` and `Send`
5295 are now 'unsafe traits' so one can "forcibly" implement them via
5296 `unsafe impl` if a type confirms to the requirements for them
5297 even though the internals do not (e.g. structs containing unsafe
5298 pointers like `Arc`). These changes are intended to prevent some
5299 footguns and are collectively known as [opt-in built-in
5300 traits][oibit] (though `Sync` and `Send` will soon become pure
5301 library types unknown to the compiler).
5302 * Operator traits now take their operands [by value][ops], and
5303 comparison traits can use multidispatch to compare one type
5304 against multiple other types, allowing e.g. `String` to be
5305 compared with `&str`.
5306 * `if let` and `while let` are no longer feature-gated.
5307 * Rust has adopted a more [uniform syntax for escaping unicode
5308 characters][unicode].
5309 * `macro_rules!` [has been declared stable][mac]. Though it is a
5310 flawed system it is sufficiently popular that it must be usable
5311 for 1.0. Effort has gone into [future-proofing][mac-future] it
5312 in ways that will allow other macro systems to be developed in
5313 parallel, and won't otherwise impact the evolution of the
5315 * The prelude has been [pared back significantly][prelude] such
5316 that it is the minimum necessary to support the most pervasive
5317 code patterns, and through [generalized where clauses][where]
5318 many of the prelude extension traits have been consolidated.
5319 * Rust's rudimentary reflection [has been removed][refl], as it
5320 incurred too much code generation for little benefit.
5321 * [Struct variants][structvars] are no longer feature-gated.
5322 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5323 known as 'higher-ranked trait bounds', this crucially allows
5324 unboxed closures to work.
5325 * Macros invocations surrounded by parens or square brackets and
5326 not terminated by a semicolon are [parsed as
5327 expressions][macros], which makes expressions like `vec![1i32,
5328 2, 3].len()` work as expected.
5329 * Trait objects now implement their traits automatically, and
5330 traits that can be coerced to objects now must be [object
5332 * Automatically deriving traits is now done with `#[derive(...)]`
5333 not `#[deriving(...)]` for [consistency with other naming
5334 conventions][derive].
5335 * Importing the containing module or enum at the same time as
5336 items or variants they contain is [now done with `self` instead
5337 of `mod`][self], as in use `foo::{self, bar}`
5338 * Glob imports are no longer feature-gated.
5339 * The `box` operator and `box` patterns have been feature-gated
5340 pending a redesign. For now unique boxes should be allocated
5341 like other containers, with `Box::new`.
5345 * A [series][coll1] of [efforts][coll2] to establish
5346 [conventions][coll3] for collections types has resulted in API
5347 improvements throughout the standard library.
5348 * New [APIs for error handling][err] provide ergonomic interop
5349 between error types, and [new conventions][err-conv] describe
5350 more clearly the recommended error handling strategies in Rust.
5351 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5352 it is easier to discuss failure in the context of error handling
5353 without making clarifications as to whether you are referring to
5354 the 'fail' macro or failure more generally.
5355 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5356 syscall when available.
5357 * The 'serialize' crate has been renamed 'rustc-serialize' and
5358 moved out of the distribution to Cargo. Although it is widely
5359 used now, it is expected to be superseded in the near future.
5360 * The `Show` formatter, typically implemented with
5361 `#[derive(Show)]` is [now requested with the `{:?}`
5362 specifier][show] and is intended for use by all types, for uses
5363 such as `println!` debugging. The new `String` formatter must be
5364 implemented by hand, uses the `{}` specifier, and is intended
5365 for full-fidelity conversions of things that can logically be
5366 represented as strings.
5370 * [Flexible target specification][flex] allows rustc's code
5371 generation to be configured to support otherwise-unsupported
5373 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5374 respective debuggers with Rust-appropriate pretty-printing.
5375 * The Windows installation of Rust is distributed with the
5376 MinGW components currently required to link binaries on that
5381 * Nullable enum optimizations have been extended to more types so
5382 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5383 space than the inner types themselves.
5384 * Work has begun on supporting AArch64.
5386 [Cargo]: https://crates.io
5387 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5388 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5389 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5390 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5391 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5392 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5393 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5394 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5395 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5396 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5397 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5398 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5399 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5400 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5401 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5402 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5403 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5404 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5405 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5406 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5407 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5408 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5409 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5410 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5411 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5412 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5413 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5414 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5415 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5416 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5417 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5418 [trpl]: https://doc.rust-lang.org/book/index.html
5419 [rbe]: http://rustbyexample.com/
5422 Version 0.12.0 (2014-10-09)
5423 =============================
5425 * ~1900 changes, numerous bugfixes
5429 * The introductory documentation (now called The Rust Guide) has
5430 been completely rewritten, as have a number of supplementary
5432 * Rust's package manager, Cargo, continues to improve and is
5433 sometimes considered to be quite awesome.
5434 * Many API's in `std` have been reviewed and updated for
5435 consistency with the in-development Rust coding
5436 guidelines. The standard library documentation tracks
5437 stabilization progress.
5438 * Minor libraries have been moved out-of-tree to the rust-lang org
5439 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5440 be installed with Cargo.
5441 * Lifetime elision allows lifetime annotations to be left off of
5442 function declarations in many common scenarios.
5443 * Rust now works on 64-bit Windows.
5446 * Indexing can be overloaded with the `Index` and `IndexMut`
5448 * The `if let` construct takes a branch only if the `let` pattern
5449 matches, currently behind the 'if_let' feature gate.
5450 * 'where clauses', a more flexible syntax for specifying trait
5451 bounds that is more aesthetic, have been added for traits and
5452 free functions. Where clauses will in the future make it
5453 possible to constrain associated types, which would be
5454 impossible with the existing syntax.
5455 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5456 the 'slicing_syntax' feature gate, and can be overloaded with
5457 the `Slice` or `SliceMut` traits.
5458 * The syntax for matching of sub-slices has been changed to use a
5459 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5460 consistency with other uses of `..` and to future-proof
5461 potential additional uses of the syntax.
5462 * The syntax for matching inclusive ranges in patterns has changed
5463 from `0..3` to `0...4` to be consistent with the exclusive range
5465 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5466 c]`) has been put behind the 'advanced_slice_patterns' feature
5467 gate and may be removed in the future.
5468 * Components of tuples and tuple structs can be extracted using
5469 the `value.0` syntax, currently behind the `tuple_indexing`
5471 * The `#[crate_id]` attribute is no longer supported; versioning
5472 is handled by the package manager.
5473 * Renaming crate imports are now written `extern crate foo as bar`
5474 instead of `extern crate bar = foo`.
5475 * Renaming use statements are now written `use foo as bar` instead
5477 * `let` and `match` bindings and argument names in macros are now
5479 * The new, more efficient, closure types ('unboxed closures') have
5480 been added under a feature gate, 'unboxed_closures'. These will
5481 soon replace the existing closure types, once higher-ranked
5482 trait lifetimes are added to the language.
5483 * `move` has been added as a keyword, for indicating closures
5484 that capture by value.
5485 * Mutation and assignment is no longer allowed in pattern guards.
5486 * Generic structs and enums can now have trait bounds.
5487 * The `Share` trait is now called `Sync` to free up the term
5488 'shared' to refer to 'shared reference' (the default reference
5490 * Dynamically-sized types have been mostly implemented,
5491 unifying the behavior of fat-pointer types with the rest of the
5493 * As part of dynamically-sized types, the `Sized` trait has been
5494 introduced, which qualifying types implement by default, and
5495 which type parameters expect by default. To specify that a type
5496 parameter does not need to be sized, write `<Sized? T>`. Most
5497 types are `Sized`, notable exceptions being unsized arrays
5498 (`[T]`) and trait types.
5499 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5500 * Lifetime bounds can now be applied to type parameters and object
5502 * The old, reference counted GC type, `Gc<T>` which was once
5503 denoted by the `@` sigil, has finally been removed. GC will be
5504 revisited in the future.
5507 * Library documentation has been improved for a number of modules.
5508 * Bit-vectors, collections::bitv has been modernized.
5509 * The url crate is deprecated in favor of
5510 http://github.com/servo/rust-url, which can be installed with
5512 * Most I/O stream types can be cloned and subsequently closed from
5514 * A `std::time::Duration` type has been added for use in I/O
5515 methods that rely on timers, as well as in the 'time' crate's
5516 `Timespec` arithmetic.
5517 * The runtime I/O abstraction layer that enabled the green thread
5518 scheduler to do non-thread-blocking I/O has been removed, along
5519 with the libuv-based implementation employed by the green thread
5520 scheduler. This will greatly simplify the future I/O work.
5521 * `collections::btree` has been rewritten to have a more
5522 idiomatic and efficient design.
5525 * rustdoc output now indicates the stability levels of API's.
5526 * The `--crate-name` flag can specify the name of the crate
5527 being compiled, like `#[crate_name]`.
5528 * The `-C metadata` specifies additional metadata to hash into
5529 symbol names, and `-C extra-filename` specifies additional
5530 information to put into the output filename, for use by the
5531 package manager for versioning.
5532 * debug info generation has continued to improve and should be
5533 more reliable under both gdb and lldb.
5534 * rustc has experimental support for compiling in parallel
5535 using the `-C codegen-units` flag.
5536 * rustc no longer encodes rpath information into binaries by
5540 * Stack usage has been optimized with LLVM lifetime annotations.
5541 * Official Rust binaries on Linux are more compatible with older
5542 kernels and distributions, built on CentOS 5.10.
5545 Version 0.11.0 (2014-07-02)
5546 ==========================
5548 * ~1700 changes, numerous bugfixes
5551 * ~[T] has been removed from the language. This type is superseded by
5553 * ~str has been removed from the language. This type is superseded by
5555 * ~T has been removed from the language. This type is superseded by the
5557 * @T has been removed from the language. This type is superseded by the
5558 standard library's std::gc::Gc<T> type.
5559 * Struct fields are now all private by default.
5560 * Vector indices and shift amounts are both required to be a `uint`
5561 instead of any integral type.
5562 * Byte character, byte string, and raw byte string literals are now all
5563 supported by prefixing the normal literal with a `b`.
5564 * Multiple ABIs are no longer allowed in an ABI string
5565 * The syntax for lifetimes on closures/procedures has been tweaked
5566 slightly: `<'a>|A, B|: 'b + K -> T`
5567 * Floating point modulus has been removed from the language; however it
5568 is still provided by a library implementation.
5569 * Private enum variants are now disallowed.
5570 * The `priv` keyword has been removed from the language.
5571 * A closure can no longer be invoked through a &-pointer.
5572 * The `use foo, bar, baz;` syntax has been removed from the language.
5573 * The transmute intrinsic no longer works on type parameters.
5574 * Statics now allow blocks/items in their definition.
5575 * Trait bounds are separated from objects with + instead of : now.
5576 * Objects can no longer be read while they are mutably borrowed.
5577 * The address of a static is now marked as insignificant unless the
5578 #[inline(never)] attribute is placed it.
5579 * The #[unsafe_destructor] attribute is now behind a feature gate.
5580 * Struct literals are no longer allowed in ambiguous positions such as
5581 if, while, match, and for..in.
5582 * Declaration of lang items and intrinsics are now feature-gated by
5584 * Integral literals no longer default to `int`, and floating point
5585 literals no longer default to `f64`. Literals must be suffixed with an
5586 appropriate type if inference cannot determine the type of the
5588 * The Box<T> type is no longer implicitly borrowed to &mut T.
5589 * Procedures are now required to not capture borrowed references.
5592 * The standard library is now a "facade" over a number of underlying
5593 libraries. This means that development on the standard library should
5594 be speedier due to smaller crates, as well as a clearer line between
5596 * A new library, libcore, lives under the standard library's facade
5597 which is Rust's "0-assumption" library, suitable for embedded and
5598 kernel development for example.
5599 * A regex crate has been added to the standard distribution. This crate
5600 includes statically compiled regular expressions.
5601 * The unwrap/unwrap_err methods on Result require a Show bound for
5602 better error messages.
5603 * The return types of the std::comm primitives have been centralized
5604 around the Result type.
5605 * A number of I/O primitives have gained the ability to time out their
5607 * A number of I/O primitives have gained the ability to close their
5608 reading/writing halves to cancel pending operations.
5609 * Reverse iterator methods have been removed in favor of `rev()` on
5610 their forward-iteration counterparts.
5611 * A bitflags! macro has been added to enable easy interop with C and
5612 management of bit flags.
5613 * A debug_assert! macro is now provided which is disabled when
5614 `--cfg ndebug` is passed to the compiler.
5615 * A graphviz crate has been added for creating .dot files.
5616 * The std::cast module has been migrated into std::mem.
5617 * The std::local_data api has been migrated from freestanding functions
5618 to being based on methods.
5619 * The Pod trait has been renamed to Copy.
5620 * jemalloc has been added as the default allocator for types.
5621 * The API for allocating memory has been changed to use proper alignment
5622 and sized deallocation
5623 * Connecting a TcpStream or binding a TcpListener is now based on a
5624 string address and a u16 port. This allows connecting to a hostname as
5626 * The Reader trait now contains a core method, read_at_least(), which
5627 correctly handles many repeated 0-length reads.
5628 * The process-spawning API is now centered around a builder-style
5630 * The :? printing qualifier has been moved from the standard library to
5631 an external libdebug crate.
5632 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5633 have been renamed to Eq/Ord.
5634 * The select/plural methods have been removed from format!. The escapes
5635 for { and } have also changed from \{ and \} to {{ and }},
5637 * The TaskBuilder API has been re-worked to be a true builder, and
5638 extension traits for spawning native/green tasks have been added.
5641 * All breaking changes to the language or libraries now have their
5642 commit message annotated with `[breaking-change]` to allow for easy
5643 discovery of breaking changes.
5644 * The compiler will now try to suggest how to annotate lifetimes if a
5645 lifetime-related error occurs.
5646 * Debug info continues to be improved greatly with general bug fixes and
5647 better support for situations like link time optimization (LTO).
5648 * Usage of syntax extensions when cross-compiling has been fixed.
5649 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5650 -fdata-sections and --gc-sections has been enabled by default
5651 * The compiler is now stricter about where it will load module files
5652 from when a module is declared via `mod foo;`.
5653 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5654 Syntax extensions are now discovered via a "plugin registrar" type
5655 which will be extended in the future to other various plugins.
5656 * Lints have been restructured to allow for dynamically loadable lints.
5657 * A number of rustdoc improvements:
5658 * The HTML output has been visually redesigned.
5659 * Markdown is now powered by hoedown instead of sundown.
5660 * Searching heuristics have been greatly improved.
5661 * The search index has been reduced in size by a great amount.
5662 * Cross-crate documentation via `pub use` has been greatly improved.
5663 * Primitive types are now hyperlinked and documented.
5664 * Documentation has been moved from static.rust-lang.org/doc to
5666 * A new sandbox, play.rust-lang.org, is available for running and
5667 sharing rust code examples on-line.
5668 * Unused attributes are now more robustly warned about.
5669 * The dead_code lint now warns about unused struct fields.
5670 * Cross-compiling to iOS is now supported.
5671 * Cross-compiling to mipsel is now supported.
5672 * Stability attributes are now inherited by default and no longer apply
5673 to intra-crate usage, only inter-crate usage.
5674 * Error message related to non-exhaustive match expressions have been
5678 Version 0.10 (2014-04-03)
5679 =========================
5681 * ~1500 changes, numerous bugfixes
5684 * A new RFC process is now in place for modifying the language.
5685 * Patterns with `@`-pointers have been removed from the language.
5686 * Patterns with unique vectors (`~[T]`) have been removed from the
5688 * Patterns with unique strings (`~str`) have been removed from the
5690 * `@str` has been removed from the language.
5691 * `@[T]` has been removed from the language.
5692 * `@self` has been removed from the language.
5693 * `@Trait` has been removed from the language.
5694 * Headers on `~` allocations which contain `@` boxes inside the type for
5695 reference counting have been removed.
5696 * The semantics around the lifetimes of temporary expressions have changed,
5697 see #3511 and #11585 for more information.
5698 * Cross-crate syntax extensions are now possible, but feature gated. See
5699 #11151 for more information. This includes both `macro_rules!` macros as
5700 well as syntax extensions such as `format!`.
5701 * New lint modes have been added, and older ones have been turned on to be
5703 * Unnecessary parentheses
5706 * Uppercase variables
5707 * Publicly visible private types
5708 * `#[deriving]` with raw pointers
5709 * Unsafe functions can no longer be coerced to closures.
5710 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5711 * The `#[simd]` attribute is now behind a feature gate.
5712 * Visibility is no longer allowed on `extern crate` statements, and
5713 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5714 * Trailing commas are now allowed in argument lists and tuple patterns.
5715 * The `do` keyword has been removed, it is now a reserved keyword.
5716 * Default type parameters have been implemented, but are feature gated.
5717 * Borrowed variables through captures in closures are now considered soundly.
5718 * `extern mod` is now `extern crate`
5719 * The `Freeze` trait has been removed.
5720 * The `Share` trait has been added for types that can be shared among
5722 * Labels in macros are now hygienic.
5723 * Expression/statement macro invocations can be delimited with `{}` now.
5724 * Treatment of types allowed in `static mut` locations has been tweaked.
5725 * The `*` and `.` operators are now overloadable through the `Deref` and
5727 * `~Trait` and `proc` no longer have `Send` bounds by default.
5728 * Partial type hints are now supported with the `_` type marker.
5729 * An `Unsafe` type was introduced for interior mutability. It is now
5730 considered undefined to transmute from `&T` to `&mut T` without using the
5732 * The #[linkage] attribute was implemented for extern statics/functions.
5733 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
5734 * `Pod` was renamed to `Copy`.
5737 * The `libextra` library has been removed. It has now been decomposed into
5738 component libraries with smaller and more focused nuggets of
5739 functionality. The full list of libraries can be found on the
5740 documentation index page.
5741 * std: `std::condition` has been removed. All I/O errors are now propagated
5742 through the `Result` type. In order to assist with error handling, a
5743 `try!` macro for unwrapping errors with an early return and a lint for
5744 unused results has been added. See #12039 for more information.
5745 * std: The `vec` module has been renamed to `slice`.
5746 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
5747 This will become the only growable vector in the future.
5748 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
5749 are now found at `std::io::BufferedReader` instead of
5750 `std::io::buffered::BufferedReader`.
5751 * std: `print` and `println` are no longer in the prelude, the `print!` and
5752 `println!` macros are intended to be used instead.
5753 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5754 attempts to statically prevent cycles.
5755 * std: The standard distribution is adopting the policy of pushing failure
5756 to the user rather than failing in libraries. Many functions (such as
5757 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5758 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5759 deriving mode: `#[deriving(Show)]`.
5760 * std: `ToStr` is now implemented for all types implementing `Show`.
5761 * std: The formatting trait methods now take `&self` instead of `&T`
5762 * std: The `invert()` method on iterators has been renamed to `rev()`
5763 * std: `std::num` has seen a reduction in the genericity of its traits,
5764 consolidating functionality into a few core traits.
5765 * std: Backtraces are now printed on task failure if the environment
5766 variable `RUST_BACKTRACE` is present.
5767 * std: Naming conventions for iterators have been standardized. More details
5768 can be found on the wiki's style guide.
5769 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5770 still implement the function.
5771 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5772 * std: `assert_approx_eq!` has been removed
5773 * std: The `e` and `E` formatting specifiers for floats have been added to
5774 print them in exponential notation.
5775 * std: The `Times` trait has been removed
5776 * std: Indications of variance and opting out of builtin bounds is done
5777 through marker types in `std::kinds::marker` now
5778 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5779 `#[deriving(Hash)]` is now possible.
5780 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5781 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5782 * std: `Chan::new` is now `channel()`.
5783 * std: A new synchronous channel type has been implemented.
5784 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5785 * std: `hashmap` and `trie` have been moved to `libcollections`
5786 * std: `run` has been rolled into `io::process`
5787 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5788 * std: The equality and comparison traits have seen some reorganization.
5789 * std: `rand` has moved to `librand`.
5790 * std: `to_{lower,upper}case` has been implemented for `char`.
5791 * std: Logging has been moved to `liblog`.
5792 * collections: `HashMap` has been rewritten for higher performance and less
5794 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5795 it can be booted manually. The runtime guide has more information and
5797 * native: All I/O functionality except signals has been implemented.
5798 * green: Task spawning with `libgreen` has been optimized with stack caching
5799 and various trimming of code.
5800 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5801 * sync: The `extra::sync` module has been updated to modern rust (and moved
5802 to the `sync` library), tweaking and improving various interfaces while
5803 dropping redundant functionality.
5804 * sync: A new `Barrier` type has been added to the `sync` library.
5805 * sync: An efficient mutex for native and green tasks has been implemented.
5806 * serialize: The `base64` module has seen some improvement. It treats
5807 newlines better, has non-string error values, and has seen general
5809 * fourcc: A `fourcc!` macro was introduced
5810 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5811 hexadecimal literal.
5814 * `rustpkg` has been deprecated and removed from the main repository. Its
5815 replacement, `cargo`, is under development.
5816 * Nightly builds of rust are now available
5817 * The memory usage of rustc has been improved many times throughout this
5819 * The build process supports disabling rpath support for the rustc binary
5821 * Code generation has improved in some cases, giving more information to the
5822 LLVM optimization passes to enable more extensive optimizations.
5823 * Debuginfo compatibility with lldb on OSX has been restored.
5824 * The master branch is now gated on an android bot, making building for
5825 android much more reliable.
5826 * Output flags have been centralized into one `--emit` flag.
5827 * Crate type flags have been centralized into one `--crate-type` flag.
5828 * Codegen flags have been consolidated behind a `-C` flag.
5829 * Linking against outdated crates now has improved error messages.
5830 * Error messages with lifetimes will often suggest how to annotate the
5831 function to fix the error.
5832 * Many more types are documented in the standard library, and new guides
5834 * Many `rustdoc` improvements:
5835 * code blocks are syntax highlighted.
5836 * render standalone markdown files.
5837 * the --test flag tests all code blocks by default.
5838 * exported macros are displayed.
5839 * re-exported types have their documentation inlined at the location of the
5841 * search works across crates that have been rendered to the same output
5845 Version 0.9 (2014-01-09)
5846 ==========================
5848 * ~1800 changes, numerous bugfixes
5851 * The `float` type has been removed. Use `f32` or `f64` instead.
5852 * A new facility for enabling experimental features (feature gating) has
5853 been added, using the crate-level `#[feature(foo)]` attribute.
5854 * Managed boxes (@) are now behind a feature gate
5855 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5856 standard library's `Gc` or `Rc` types instead.
5857 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5858 * Jumping back to the top of a loop is now done with `continue` instead of
5860 * Strings can no longer be mutated through index assignment.
5861 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5862 hash delimiters, as in `r###"foo"###`.
5863 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5865 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5866 * `@fn`s have been removed.
5867 * `do` only works with procs in order to make it obvious what the cost
5869 * Single-element tuple-like structs can no longer be dereferenced to
5870 obtain the inner value. A more comprehensive solution for overloading
5871 the dereference operator will be provided in the future.
5872 * The `#[link(...)]` attribute has been replaced with
5873 `#[crate_id = "name#vers"]`.
5874 * Empty `impl`s must be terminated with empty braces and may not be
5875 terminated with a semicolon.
5876 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5877 no longer has any special meaning.
5878 * The old `fmt!` string formatting macro has been removed.
5879 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5880 `print!` and `println!`.
5881 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5882 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5883 `extern mod foo = "bar"` instead.
5884 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5885 * Macros can have attributes.
5886 * Macros can expand to items with attributes.
5887 * Macros can expand to multiple items.
5888 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5889 * Comments may be nested.
5890 * Values automatically coerce to trait objects they implement, without
5892 * Enum discriminants are no longer an entire word but as small as needed to
5893 contain all the variants. The `repr` attribute can be used to override
5894 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5895 `#[repr(C)]` to match C enums.
5896 * Non-string literals are not allowed in attributes (they never worked).
5897 * The FFI now supports variadic functions.
5898 * Octal numeric literals, as in `0o7777`.
5899 * The `concat!` syntax extension performs compile-time string concatenation.
5900 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5901 removed as Rust no longer uses segmented stacks.
5902 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5903 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5904 not `*`; ignoring remaining fields of a struct is also done with `..`,
5905 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5906 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5907 * `rustc` supports the "system" calling convention, which defaults to the
5908 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5910 * The `type_overflow` lint (default: warn) checks literals for overflow.
5911 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5912 * The `attribute_usage` lint (default: warn) warns about unknown
5914 * The `unknown_features` lint (default: warn) warns about unknown
5916 * The `dead_code` lint (default: warn) checks for dead code.
5917 * Rust libraries can be linked statically to one another
5918 * `#[link_args]` is behind the `link_args` feature gate.
5919 * Native libraries are now linked with `#[link(name = "foo")]`
5920 * Native libraries can be statically linked to a rust crate
5921 (`#[link(name = "foo", kind = "static")]`).
5922 * Native OS X frameworks are now officially supported
5923 (`#[link(name = "foo", kind = "framework")]`).
5924 * The `#[thread_local]` attribute creates thread-local (not task-local)
5925 variables. Currently behind the `thread_local` feature gate.
5926 * The `return` keyword may be used in closures.
5927 * Types that can be copied via a memcpy implement the `Pod` kind.
5928 * The `cfg` attribute can now be used on struct fields and enum variants.
5931 * std: The `option` and `result` API's have been overhauled to make them
5932 simpler, more consistent, and more composable.
5933 * std: The entire `std::io` module has been replaced with one that is
5934 more comprehensive and that properly interfaces with the underlying
5935 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5937 * std: `io::util` contains a number of useful implementations of
5938 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5939 `ZeroReader`, `TeeReader`.
5940 * std: The reference counted pointer type `extra::rc` moved into std.
5941 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5942 just a wrapper around it).
5943 * std: The `Either` type has been removed.
5944 * std: `fmt::Default` can be implemented for any type to provide default
5945 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5946 * std: The `rand` API continues to be tweaked.
5947 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5948 on failure in gdb, is now named `rust_fail`.
5949 * std: The `each_key` and `each_value` methods on `HashMap` have been
5950 replaced by the `keys` and `values` iterators.
5951 * std: Functions dealing with type size and alignment have moved from the
5952 `sys` module to the `mem` module.
5953 * std: The `path` module was written and API changed.
5954 * std: `str::from_utf8` has been changed to cast instead of allocate.
5955 * std: `starts_with` and `ends_with` methods added to vectors via the
5956 `ImmutableEqVector` trait, which is in the prelude.
5957 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
5958 if the index is out of bounds.
5959 * std: Task failure no longer propagates between tasks, as the model was
5960 complex, expensive, and incompatible with thread-based tasks.
5961 * std: The `Any` type can be used for dynamic typing.
5962 * std: `~Any` can be passed to the `fail!` macro and retrieved via
5964 * std: Methods that produce iterators generally do not have an `_iter`
5966 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
5967 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
5968 * std: `util::ignore` renamed to `prelude::drop`.
5969 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
5971 * std: `vec::raw` has seen a lot of cleanup and API changes.
5972 * std: The standard library no longer includes any C++ code, and very
5973 minimal C, eliminating the dependency on libstdc++.
5974 * std: Runtime scheduling and I/O functionality has been factored out into
5975 extensible interfaces and is now implemented by two different crates:
5976 libnative, for native threading and I/O; and libgreen, for green threading
5977 and I/O. This paves the way for using the standard library in more limited
5978 embedded environments.
5979 * std: The `comm` module has been rewritten to be much faster, have a
5980 simpler, more consistent API, and to work for both native and green
5982 * std: All libuv dependencies have been moved into the rustuv crate.
5983 * native: New implementations of runtime scheduling on top of OS threads.
5984 * native: New native implementations of TCP, UDP, file I/O, process spawning,
5986 * green: The green thread scheduler and message passing types are almost
5988 * extra: The `flatpipes` module had bitrotted and was removed.
5989 * extra: All crypto functions have been removed and Rust now has a policy of
5990 not reimplementing crypto in the standard library. In the future crypto
5991 will be provided by external crates with bindings to established libraries.
5992 * extra: `c_vec` has been modernized.
5993 * extra: The `sort` module has been removed. Use the `sort` method on
5997 * The `rust` and `rusti` commands have been removed, due to lack of
5999 * `rustdoc` was completely rewritten.
6000 * `rustdoc` can test code examples in documentation.
6001 * `rustpkg` can test packages with the argument, 'test'.
6002 * `rustpkg` supports arbitrary dependencies, including C libraries.
6003 * `rustc`'s support for generating debug info is improved again.
6004 * `rustc` has better error reporting for unbalanced delimiters.
6005 * `rustc`'s JIT support was removed due to bitrot.
6006 * Executables and static libraries can be built with LTO (-Z lto)
6007 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6011 Version 0.8 (2013-09-26)
6012 ============================
6014 * ~2200 changes, numerous bugfixes
6017 * The `for` loop syntax has changed to work with the `Iterator` trait.
6018 * At long last, unwinding works on Windows.
6019 * Default methods are ready for use.
6020 * Many trait inheritance bugs fixed.
6021 * Owned and borrowed trait objects work more reliably.
6022 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6023 * rustc can omit emission of code for the `debug!` macro if it is passed
6025 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6026 for foo.rs, then foo/mod.rs, and will generate an error when both are
6028 * Strings no longer contain trailing nulls. The new `std::c_str` module
6029 provides new mechanisms for converting to C strings.
6030 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6031 * The FFI has been overhauled such that foreign functions are called directly,
6032 instead of through a stack-switching wrapper.
6033 * Calling a foreign function must be done through a Rust function with the
6034 `#[fixed_stack_segment]` attribute.
6035 * The `externfn!` macro can be used to declare both a foreign function and
6036 a `#[fixed_stack_segment]` wrapper at once.
6037 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6038 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6039 * `priv` is disallowed everywhere except for struct fields and enum variants.
6040 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6041 * `ref` bindings in irrefutable patterns work correctly now.
6042 * `char` is now prevented from containing invalid code points.
6043 * Casting to `bool` is no longer allowed.
6044 * `\0` is now accepted as an escape in chars and strings.
6045 * `yield` is a reserved keyword.
6046 * `typeof` is a reserved keyword.
6047 * Crates may be imported by URL with `extern mod foo = "url";`.
6048 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6049 * Static vectors can be initialized with repeating elements,
6050 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6051 * Static structs can be initialized with functional record update,
6052 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6053 * `cfg!` can be used to conditionally execute code based on the crate
6054 configuration, similarly to `#[cfg(...)]`.
6055 * The `unnecessary_qualification` lint detects unneeded module
6056 prefixes (default: allow).
6057 * Arithmetic operations have been implemented on the SIMD types in
6058 `std::unstable::simd`.
6059 * Exchange allocation headers were removed, reducing memory usage.
6060 * `format!` implements a completely new, extensible, and higher-performance
6061 string formatting system. It will replace `fmt!`.
6062 * `print!` and `println!` write formatted strings (using the `format!`
6063 extension) to stdout.
6064 * `write!` and `writeln!` write formatted strings (using the `format!`
6065 extension) to the new Writers in `std::rt::io`.
6066 * The library section in which a function or static is placed may
6067 be specified with `#[link_section = "..."]`.
6068 * The `proto!` syntax extension for defining bounded message protocols
6070 * `macro_rules!` is hygienic for `let` declarations.
6071 * The `#[export_name]` attribute specifies the name of a symbol.
6072 * `unreachable!` can be used to indicate unreachable code, and fails
6076 * std: Transitioned to the new runtime, written in Rust.
6077 * std: Added an experimental I/O library, `rt::io`, based on the new
6079 * std: A new generic `range` function was added to the prelude, replacing
6080 `uint::range` and friends.
6081 * std: `range_rev` no longer exists. Since range is an iterator it can be
6082 reversed with `range(lo, hi).invert()`.
6083 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6084 renamed to `unwrap_or`.
6085 * std: The `iterator` module was renamed to `iter`.
6086 * std: Integral types now support the `checked_add`, `checked_sub`, and
6087 `checked_mul` operations for detecting overflow.
6088 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6090 * std: Methods are standardizing on conventions for casting methods:
6091 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6093 * std: The `CString` type in `c_str` provides new ways to convert to and
6095 * std: `DoubleEndedIterator` can yield elements in two directions.
6096 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6098 * std: `str::from_bytes` renamed to `str::from_utf8`.
6099 * std: `pop_opt` and `shift_opt` methods added to vectors.
6100 * std: The task-local data interface no longer uses @, and keys are
6101 no longer function pointers.
6102 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6103 * std: Added `SharedPort` to `comm`.
6104 * std: `Eq` has a default method for `ne`; only `eq` is required
6106 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6107 is required in implementations.
6108 * std: `is_utf8` performance is improved, impacting many string functions.
6109 * std: `os::MemoryMap` provides cross-platform mmap.
6110 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6111 are not 'in-bounds' are considered undefined.
6112 * std: Many freestanding functions in `vec` removed in favor of methods.
6113 * std: Many freestanding functions on scalar types removed in favor of
6115 * std: Many options to task builders were removed since they don't make
6116 sense in the new scheduler design.
6117 * std: More containers implement `FromIterator` so can be created by the
6119 * std: More complete atomic types in `unstable::atomics`.
6120 * std: `comm::PortSet` removed.
6121 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6122 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6123 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6124 default implementations.
6125 * std: Various `from_str` functions were removed in favor of a generic
6126 `from_str` which is available in the prelude.
6127 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6128 * extra: `dlist`, the doubly-linked list was modernized.
6129 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6130 * extra: Added `glob` module, replacing `std::os::glob`.
6131 * extra: `rope` was removed.
6132 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6133 * extra: `net`, and `timer` were removed. The experimental replacements
6134 are `std::rt::io::net` and `std::rt::io::timer`.
6135 * extra: Iterators implemented for `SmallIntMap`.
6136 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6137 * extra: `SmallIntSet` removed. Use `BitvSet`.
6138 * extra: Performance of JSON parsing greatly improved.
6139 * extra: `semver` updated to SemVer 2.0.0.
6140 * extra: `term` handles more terminals correctly.
6141 * extra: `dbg` module removed.
6142 * extra: `par` module removed.
6143 * extra: `future` was cleaned up, with some method renames.
6144 * extra: Most free functions in `getopts` were converted to methods.
6147 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6148 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6149 similarly to gcc's `--march` flag.
6150 * rustc's performance compiling small crates is much better.
6151 * rustpkg has received many improvements.
6152 * rustpkg supports git tags as package IDs.
6153 * rustpkg builds into target-specific directories so it can be used for
6155 * The number of concurrent test tasks is controlled by the environment
6156 variable RUST_TEST_TASKS.
6157 * The test harness can now report metrics for benchmarks.
6158 * All tools have man pages.
6159 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6160 * The runtime uses jemalloc for allocations.
6161 * Segmented stacks are temporarily disabled as part of the transition to
6162 the new runtime. Stack overflows are possible!
6163 * A new documentation backend, rustdoc_ng, is available for use. It is
6164 still invoked through the normal `rustdoc` command.
6167 Version 0.7 (2013-07-03)
6168 =======================
6170 * ~2000 changes, numerous bugfixes
6173 * `impl`s no longer accept a visibility qualifier. Put them on methods
6175 * The borrow checker has been rewritten with flow-sensitivity, fixing
6176 many bugs and inconveniences.
6177 * The `self` parameter no longer implicitly means `&'self self`,
6178 and can be explicitly marked with a lifetime.
6179 * Overloadable compound operators (`+=`, etc.) have been temporarily
6180 removed due to bugs.
6181 * The `for` loop protocol now requires `for`-iterators to return `bool`
6182 so they compose better.
6183 * The `Durable` trait is replaced with the `'static` bounds.
6184 * Trait default methods work more often.
6185 * Structs with the `#[packed]` attribute have byte alignment and
6186 no padding between fields.
6187 * Type parameters bound by `Copy` must now be copied explicitly with
6189 * It is now illegal to move out of a dereferenced unsafe pointer.
6190 * `Option<~T>` is now represented as a nullable pointer.
6191 * `@mut` does dynamic borrow checks correctly.
6192 * The `main` function is only detected at the topmost level of the crate.
6193 The `#[main]` attribute is still valid anywhere.
6194 * Struct fields may no longer be mutable. Use inherited mutability.
6195 * The `#[no_send]` attribute makes a type that would otherwise be
6197 * The `#[no_freeze]` attribute makes a type that would otherwise be
6199 * Unbounded recursion will abort the process after reaching the limit
6200 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6201 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6202 are never implicitly copyable.
6203 * `#[static_assert]` makes compile-time assertions about static bools.
6204 * At long last, 'argument modes' no longer exist.
6205 * The rarely used `use mod` statement no longer exists.
6208 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6210 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6211 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6213 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6214 and unsuffixed integer literals.
6217 * The `core` crate was renamed to `std`.
6218 * The `std` crate was renamed to `extra`.
6219 * More and improved documentation.
6220 * std: `iterator` module for external iterator objects.
6221 * Many old-style (internal, higher-order function) iterators replaced by
6222 implementations of `Iterator`.
6223 * std: Many old internal vector and string iterators,
6224 incl. `any`, `all`. removed.
6225 * std: The `finalize` method of `Drop` renamed to `drop`.
6226 * std: The `drop` method now takes `&mut self` instead of `&self`.
6227 * std: The prelude no longer re-exports any modules, only types and traits.
6228 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6229 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6230 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6231 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6232 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6233 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6234 * std: Many types implement `Clone`.
6235 * std: `path` type renamed to `Path`.
6236 * std: `mut` module and `Mut` type removed.
6237 * std: Many standalone functions removed in favor of methods and iterators
6238 in `vec`, `str`. In the future methods will also work as functions.
6239 * std: `reinterpret_cast` removed. Use `transmute`.
6240 * std: ascii string handling in `std::ascii`.
6241 * std: `Rand` is implemented for ~/@.
6242 * std: `run` module for spawning processes overhauled.
6243 * std: Various atomic types added to `unstable::atomic`.
6244 * std: Various types implement `Zero`.
6245 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6246 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6247 * std: Added `os::mkdir_recursive`.
6248 * std: Added `os::glob` function performs filesystems globs.
6249 * std: `FuzzyEq` renamed to `ApproxEq`.
6250 * std: `Map` now defines `pop` and `swap` methods.
6251 * std: `Cell` constructors converted to static methods.
6252 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6253 * extra: `flate` module moved from `std` to `extra`.
6254 * extra: `fileinput` module for iterating over a series of files.
6255 * extra: `Complex` number type and `complex` module.
6256 * extra: `Rational` number type and `rational` module.
6257 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6258 * extra: `term` uses terminfo now, is more correct.
6259 * extra: `arc` functions converted to methods.
6260 * extra: Implementation of fixed output size variations of SHA-2.
6263 * `unused_variable` lint mode for unused variables (default: warn).
6264 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6266 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6268 * `dead_assignment` lint mode for unread variables (default: warn).
6269 * `unnecessary_allocation` lint mode detects some heap allocations that are
6270 immediately borrowed so could be written without allocating (default: warn).
6271 * `missing_doc` lint mode (default: allow).
6272 * `unreachable_code` lint mode (default: warn).
6273 * The `rusti` command has been rewritten and a number of bugs addressed.
6274 * rustc outputs in color on more terminals.
6275 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6276 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6277 * Compiling with `-g` will make the binary record information about
6278 dynamic borrowcheck failures for debugging.
6279 * rustdoc has a nicer stylesheet.
6280 * Various improvements to rustdoc.
6281 * Improvements to rustpkg (see the detailed release notes).
6284 Version 0.6 (2013-04-03)
6285 ========================
6287 * ~2100 changes, numerous bugfixes
6290 * The self type parameter in traits is now spelled `Self`
6291 * The `self` parameter in trait and impl methods must now be explicitly
6292 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6293 * Static methods no longer require the `static` keyword and instead
6294 are distinguished by the lack of a `self` parameter
6295 * Replaced the `Durable` trait with the `'static` lifetime
6296 * The old closure type syntax with the trailing sigil has been
6297 removed in favor of the more consistent leading sigil
6298 * `super` is a keyword, and may be prefixed to paths
6299 * Trait bounds are separated with `+` instead of whitespace
6300 * Traits are implemented with `impl Trait for Type`
6301 instead of `impl Type: Trait`
6302 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6303 * The `export` keyword has finally been removed
6304 * The `move` keyword has been removed (see "Semantic changes")
6305 * The interior mutability qualifier on vectors, `[mut T]`, has been
6306 removed. Use `&mut [T]`, etc.
6307 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6308 * `fail` is no longer a keyword. Use `fail!()`
6309 * `assert` is no longer a keyword. Use `assert!()`
6310 * `log` is no longer a keyword. use `debug!`, etc.
6311 * 1-tuples may be represented as `(T,)`
6312 * Struct fields may no longer be `mut`. Use inherited mutability,
6313 `@mut T`, `core::mut` or `core::cell`
6314 * `extern mod { ... }` is no longer valid syntax for foreign
6315 function modules. Use extern blocks: `extern { ... }`
6316 * Newtype enums removed. Use tuple-structs.
6317 * Trait implementations no longer support visibility modifiers
6318 * Pattern matching over vectors improved and expanded
6319 * `const` renamed to `static` to correspond to lifetime name,
6320 and make room for future `static mut` unsafe mutable globals.
6321 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6322 * `Clone` implementations can be automatically generated with
6323 `#[deriving(Clone)]`
6324 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6325 instead of `foo as Bar`.
6326 * Fixed length vector types are now written as `[int, .. 3]`
6327 instead of `[int * 3]`.
6328 * Fixed length vector types can express the length as a constant
6329 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6332 * Types with owned pointers or custom destructors move by default,
6333 eliminating the `move` keyword
6334 * All foreign functions are considered unsafe
6335 * &mut is now unaliasable
6336 * Writes to borrowed @mut pointers are prevented dynamically
6338 * The name of the main function can be customized using #[main]
6339 * The default type of an inferred closure is &fn instead of @fn
6340 * `use` statements may no longer be "chained" - they cannot import
6341 identifiers imported by previous `use` statements
6342 * `use` statements are crate relative, importing from the "top"
6343 of the crate by default. Paths may be prefixed with `super::`
6344 or `self::` to change the search behavior.
6345 * Method visibility is inherited from the implementation declaration
6346 * Structural records have been removed
6347 * Many more types can be used in static items, including enums
6348 'static-lifetime pointers and vectors
6349 * Pattern matching over vectors improved and expanded
6350 * Typechecking of closure types has been overhauled to
6351 improve inference and eliminate unsoundness
6352 * Macros leave scope at the end of modules, unless that module is
6353 tagged with #[macro_escape]
6356 * Added big integers to `std::bigint`
6357 * Removed `core::oldcomm` module
6358 * Added pipe-based `core::comm` module
6359 * Numeric traits have been reorganized under `core::num`
6360 * `vec::slice` finally returns a slice
6361 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6362 * Containers reorganized around traits in `core::container`
6363 * `core::dvec` removed, `~[T]` is a drop-in replacement
6364 * `core::send_map` renamed to `core::hashmap`
6365 * `std::map` removed; replaced with `core::hashmap`
6366 * `std::treemap` reimplemented as an owned balanced tree
6367 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6368 * `core::trie` added as a fast ordered map for integer keys
6369 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6370 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6371 overload the comparison operators, whereas `TotalOrd` is used
6372 by certain container types
6375 * Replaced the 'cargo' package manager with 'rustpkg'
6376 * Added all-purpose 'rust' tool
6377 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6378 * rustc now *attempts* to offer spelling suggestions
6379 * Improved support for ARM and Android
6380 * Preliminary MIPS backend
6381 * Improved foreign function ABI implementation for x86, x86_64
6382 * Various memory usage improvements
6383 * Rust code may be embedded in foreign code under limited circumstances
6384 * Inline assembler supported by new asm!() syntax extension.
6387 Version 0.5 (2012-12-21)
6388 ===========================
6390 * ~900 changes, numerous bugfixes
6393 * Removed `<-` move operator
6394 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6395 * Removed old fixed length vector syntax - `[T]/N`
6396 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6397 * Macros may now expand to items and statements
6398 * `a.b()` is always parsed as a method call, never as a field projection
6399 * `Eq` and `IterBytes` implementations can be automatically generated
6400 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6401 * Removed the special crate language for `.rc` files
6402 * Function arguments may consist of any irrefutable pattern
6405 * `&` and `~` pointers may point to objects
6406 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6407 * Enum variants may be structs
6408 * Destructors can be added to all nominal types with the Drop trait
6409 * Structs and nullary enum variants may be constants
6410 * Values that cannot be implicitly copied are now automatically moved
6411 without writing `move` explicitly
6412 * `&T` may now be coerced to `*T`
6413 * Coercions happen in `let` statements as well as function calls
6414 * `use` statements now take crate-relative paths
6415 * The module and type namespaces have been merged so that static
6416 method names can be resolved under the trait in which they are
6419 * Improved support for language features
6420 * Trait inheritance works in many scenarios
6421 * More support for explicit self arguments in methods - `self`, `&self`
6422 `@self`, and `~self` all generally work as expected
6423 * Static methods work in more situations
6424 * Experimental: Traits may declare default methods for the implementations
6428 * New condition handling system in `core::condition`
6429 * Timsort added to `std::sort`
6430 * New priority queue, `std::priority_queue`
6431 * Pipes for serializable types, `std::flatpipes'
6432 * Serialization overhauled to be trait-based
6433 * Expanded `getopts` definitions
6434 * Moved futures to `std`
6435 * More functions are pure now
6436 * `core::comm` renamed to `oldcomm`. Still deprecated
6437 * `rustdoc` and `cargo` are libraries now
6440 * Added a preliminary REPL, `rusti`
6441 * License changed from MIT to dual MIT/APL2
6444 Version 0.4 (2012-10-15)
6445 ==========================
6447 * ~2000 changes, numerous bugfixes
6450 * All keywords are now strict and may not be used as identifiers anywhere
6451 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6452 'of', 'with', 'to', 'class'.
6453 * Classes are replaced with simpler structs
6454 * Explicit method self types
6455 * `ret` became `return` and `alt` became `match`
6456 * `import` is now `use`; `use is now `extern mod`
6457 * `extern mod { ... }` is now `extern { ... }`
6458 * `use mod` is the recommended way to import modules
6459 * `pub` and `priv` replace deprecated export lists
6460 * The syntax of `match` pattern arms now uses fat arrow (=>)
6461 * `main` no longer accepts an args vector; use `os::args` instead
6464 * Trait implementations are now coherent, ala Haskell typeclasses
6465 * Trait methods may be static
6466 * Argument modes are deprecated
6467 * Borrowed pointers are much more mature and recommended for use
6468 * Strings and vectors in the static region are stored in constant memory
6469 * Typestate was removed
6470 * Resolution rewritten to be more reliable
6471 * Support for 'dual-mode' data structures (freezing and thawing)
6474 * Most binary operators can now be overloaded via the traits in
6476 * `std::net::url` for representing URLs
6477 * Sendable hash maps in `core::send_map`
6478 * `core::task' gained a (currently unsafe) task-local storage API
6481 * An efficient new intertask communication primitive called the pipe,
6482 along with a number of higher-level channel types, in `core::pipes`
6483 * `std::arc`, an atomically reference counted, immutable, shared memory
6485 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6486 * Futures are now based on pipes and sendable
6487 * More robust linked task failure
6488 * Improved task builder API
6491 * Improved error reporting
6492 * Preliminary JIT support
6493 * Preliminary work on precise GC
6494 * Extensive architectural improvements to rustc
6495 * Begun a transition away from buggy C++-based reflection (shape) code to
6496 Rust-based (visitor) code
6497 * All hash functions and tables converted to secure, randomized SipHash
6500 Version 0.3 (2012-07-12)
6501 ========================
6503 * ~1900 changes, numerous bugfixes
6505 * New coding conveniences
6506 * Integer-literal suffix inference
6507 * Per-item control over warnings, errors
6508 * #[cfg(windows)] and #[cfg(unix)] attributes
6509 * Documentation comments
6510 * More compact closure syntax
6511 * 'do' expressions for treating higher-order functions as
6513 * *-patterns (wildcard extended to all constructor fields)
6516 * Name resolution pass and exhaustiveness checker rewritten
6517 * Region pointers and borrow checking supersede alias
6519 * Init-ness checking is now provided by a region-based liveness
6520 pass instead of the typestate pass; same for last-use analysis
6521 * Extensive work on region pointers
6523 * Experimental new language features
6524 * Slices and fixed-size, interior-allocated vectors
6525 * #!-comments for lang versioning, shell execution
6526 * Destructors and iface implementation for classes;
6527 type-parameterized classes and class methods
6528 * 'const' type kind for types that can be used to implement
6529 shared-memory concurrency patterns
6533 * Removal of various obsolete features
6534 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6535 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6537 * Constructs: do-while loops ('do' repurposed), fn binding,
6538 resources (replaced by destructors)
6540 * Compiler reorganization
6541 * Syntax-layer of compiler split into separate crate
6542 * Clang (from LLVM project) integrated into build
6543 * Typechecker split into sub-modules
6546 * New time functions
6547 * Extension methods for many built-in types
6548 * Arc: atomic-refcount read-only / exclusive-use shared cells
6549 * Par: parallel map and search routines
6550 * Extensive work on libuv interface
6551 * Much vector code moved to libraries
6552 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6553 #include, #include_str, #include_bin
6556 * Cargo automatically resolves dependencies
6559 Version 0.2 (2012-03-29)
6560 =========================
6562 * >1500 changes, numerous bugfixes
6564 * New docs and doc tooling
6566 * New port: FreeBSD x86_64
6568 * Compilation model enhancements
6569 * Generics now specialized, multiply instantiated
6570 * Functions now inlined across separate crates
6572 * Scheduling, stack and threading fixes
6573 * Noticeably improved message-passing performance
6574 * Explicit schedulers
6578 * Experimental new language features
6579 * Operator overloading
6583 * Various language extensions
6584 * C-callback function types: 'crust fn ...'
6585 * Infinite-loop construct: 'loop { ... }'
6586 * Shorten 'mutable' to 'mut'
6587 * Required mutable-local qualifier: 'let mut ...'
6588 * Basic glob-exporting: 'export foo::*;'
6589 * Alt now exhaustive, 'alt check' for runtime-checked
6590 * Block-function form of 'for' loop, with 'break' and 'ret'.
6593 * AST quasi-quote syntax extension
6594 * Revived libuv interface
6595 * New modules: core::{future, iter}, std::arena
6596 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6597 * Extensive cleanup, regularization in libstd, libcore
6600 Version 0.1 (2012-01-20)
6601 ===============================
6603 * Most language features work, including:
6604 * Unique pointers, unique closures, move semantics
6605 * Interface-constrained generics
6606 * Static interface dispatch
6608 * Multithread task scheduling
6609 * Typestate predicates
6610 * Failure unwinding, destructors
6611 * Pattern matching and destructuring assignment
6612 * Lightweight block-lambda syntax
6613 * Preliminary macro-by-example
6615 * Compiler works with the following configurations:
6616 * Linux: x86 and x86_64 hosts and targets
6617 * macOS: x86 and x86_64 hosts and targets
6618 * Windows: x86 hosts and targets
6620 * Cross compilation / multi-target configuration supported.
6622 * Preliminary API-documentation and package-management tools included.
6626 * Documentation is incomplete.
6628 * Performance is below intended target.
6630 * Standard library APIs are subject to extensive change, reorganization.
6632 * Language-level versioning is not yet operational - future code will