1 Version 1.27.0 (2018-06-21)
2 ==========================
6 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
7 be used as an identifer.
8 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
9 bare `Trait` syntax, and should make it clearer when being used in tandem with
10 `impl Trait`. Since it is equivalent to the following syntax:
11 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
12 `Box<Trait> == Box<dyn Trait>`.
13 - [Attributes on generic parameters such as types and lifetimes are
14 now stable.][48851] e.g.
15 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
16 - [The `#[must_use]` attribute can now also be used on functions as well as
17 types.][48925] It provides a lint that by default warns users when the
18 value returned by a function has not been used.
22 - [Added the `armv5te-unknown-linux-musl` target.][50423]
26 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
27 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
28 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
29 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
31 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
32 std are now available in core.][49896]
33 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
35 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
36 that the operation isn't done in place.
37 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
38 the `#[must_use]` attribute][49533] to warn about unused potentially
39 expensive allocations.
43 - [`DoubleEndedIterator::rfind`]
44 - [`DoubleEndedIterator::rfold`]
45 - [`DoubleEndedIterator::try_rfold`]
46 - [`Duration::from_micros`]
47 - [`Duration::from_nanos`]
48 - [`Duration::subsec_micros`]
49 - [`Duration::subsec_millis`]
50 - [`HashMap::remove_entry`]
51 - [`Iterator::try_fold`]
52 - [`Iterator::try_for_each`]
55 - [`String::replace_range`]
57 - [`hint::unreachable_unchecked`]
58 - [`os::unix::process::parent_id`]
60 - [`ptr::swap_nonoverlapping`]
61 - [`slice::rsplit_mut`]
63 - [`slice::swap_with_slice`]
67 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
68 `readme`, and `repository` fields.][cargo/5386]
69 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
70 a different directory than `target` for placing compilation artifacts.
71 - [Cargo will be adding automatic target inference for binaries, benchmarks,
72 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
73 specific targets e.g. using `[[bin]]` and have other binaries in locations
74 where cargo would infer a binary, Cargo will produce a warning. You can
75 disable this feature ahead of time by setting any of the following `autobins`,
76 `autobenches`, `autoexamples`, `autotests` to false.
77 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
78 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
82 - [Added “The Rustc book” into the official documentation.][49707]
83 [“The Rustc book”] documents and teaches how to use the rustc compiler.
84 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
88 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
89 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
90 compile, `"".is_empty()` will still compile.
91 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
92 will only print the inner type.][48553] e.g.
93 `print!("{:?}", AtomicBool::new(true))` will print `true`
94 not `AtomicBool(true)`.
95 - [`?` can no longer be a separator in macros.][49719] e.g. the following will
98 macro_rules! barplus {
102 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
103 could enter higher numbers but they were not supported by LLVM. Up to 512MB
104 alignment should cover all use cases.
106 [48553]: https://github.com/rust-lang/rust/pull/48553/
107 [48851]: https://github.com/rust-lang/rust/pull/48851/
108 [48925]: https://github.com/rust-lang/rust/pull/48925/
109 [49533]: https://github.com/rust-lang/rust/pull/49533/
110 [49623]: https://github.com/rust-lang/rust/pull/49623/
111 [49630]: https://github.com/rust-lang/rust/pull/49630/
112 [49664]: https://github.com/rust-lang/rust/pull/49664/
113 [49699]: https://github.com/rust-lang/rust/pull/49699/
114 [49707]: https://github.com/rust-lang/rust/pull/49707/
115 [49719]: https://github.com/rust-lang/rust/pull/49719/
116 [49896]: https://github.com/rust-lang/rust/pull/49896/
117 [49968]: https://github.com/rust-lang/rust/pull/49968/
118 [50177]: https://github.com/rust-lang/rust/pull/50177/
119 [50378]: https://github.com/rust-lang/rust/pull/50378/
120 [50398]: https://github.com/rust-lang/rust/pull/50398/
121 [50423]: https://github.com/rust-lang/rust/pull/50423/
122 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
123 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
124 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
125 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
126 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
127 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
128 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
129 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
130 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
131 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
132 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
133 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
134 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
135 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
136 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
137 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
138 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
139 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
140 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
141 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
142 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
143 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
144 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
145 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
148 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
149 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
150 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
151 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
152 [“The Rustc book”]: https://doc.rust-lang.org/rustc
155 Version 1.26.2 (2018-06-05)
156 ==========================
161 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics][51117]
163 [51117]: https://github.com/rust-lang/rust/issues/51117
166 Version 1.26.1 (2018-05-29)
167 ==========================
172 - [RLS now works on Windows][50646]
173 - [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
179 - [`fn main() -> impl Trait` no longer works for non-Termination
181 This reverts an accidental stabilization.
182 - [`NaN > NaN` no longer returns true in const-fn contexts][50812]
183 - [Prohibit using turbofish for `impl Trait` in method arguments][50950]
185 [50646]: https://github.com/rust-lang/rust/issues/50646
186 [50656]: https://github.com/rust-lang/rust/pull/50656
187 [50812]: https://github.com/rust-lang/rust/pull/50812
188 [50950]: https://github.com/rust-lang/rust/issues/50950
189 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
191 Version 1.26.0 (2018-05-10)
192 ==========================
196 - [Closures now implement `Copy` and/or `Clone` if all captured variables
197 implement either or both traits.][49299]
198 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
199 - [Stablise `'_`. The underscore lifetime can be used anywhere where a
200 lifetime can be elided.][49458]
201 - [`impl Trait` is now stable allowing you to have abstract types in returns
202 or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
203 `fn open(path: impl AsRef<Path>)`.
204 - [Pattern matching will now automatically apply dereferences.][49394]
205 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
206 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
207 - [A lot of operations are now available in a const context.][46882] E.g. You
208 can now index into constant arrays, reference and dereference into constants,
209 and use Tuple struct constructors.
210 - [Fixed entry slice patterns are now stable.][48516] e.g.
212 let points = [1, 2, 3, 4];
214 [1, 2, 3, 4] => println!("All points were sequential."),
215 _ => println!("Not all points were sequential."),
222 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
223 - [Fixed exponential projection complexity on nested types.][48296]
224 This can provide up to a ~12% reduction in compile times for certain crates.
225 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
226 to remap path prefixes outputted by the compiler.
227 - [Added `powerpc-unknown-netbsd` target.][48281]
231 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
232 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
233 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
234 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
235 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
236 - [`ascii::escape_default` is now available in libcore.][48735]
237 - [Trailing commas are now supported in std and core macros.][48056]
238 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
239 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
244 - [`*const T::copy_to_nonoverlapping`]
245 - [`*const T::copy_to`]
246 - [`*const T::read_unaligned`]
247 - [`*const T::read_volatile`]
250 - [`*const T::wrapping_add`]
251 - [`*const T::wrapping_sub`]
253 - [`*mut T::copy_to_nonoverlapping`]
254 - [`*mut T::copy_to`]
255 - [`*mut T::read_unaligned`]
256 - [`*mut T::read_volatile`]
258 - [`*mut T::replace`]
261 - [`*mut T::wrapping_add`]
262 - [`*mut T::wrapping_sub`]
263 - [`*mut T::write_bytes`]
264 - [`*mut T::write_unaligned`]
265 - [`*mut T::write_volatile`]
268 - [`FromUtf8Error::as_bytes`]
269 - [`LocalKey::try_with`]
271 - [`btree_map::Entry::and_modify`]
272 - [`fs::read_to_string`]
275 - [`hash_map::Entry::and_modify`]
276 - [`iter::FusedIterator`]
277 - [`ops::RangeInclusive`]
278 - [`ops::RangeToInclusive`]
280 - [`slice::rotate_left`]
281 - [`slice::rotate_right`]
287 - [Cargo will now output path to custom commands when `-v` is
288 passed with `--list`][cargo/5041]
289 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
293 - [The second edition of "The Rust Programming Language" book is now recommended
294 over the first.][48404]
299 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
300 syntax is now invalid.
302 use std::ops::Fn as dyn;
303 fn g(_: Box<dyn(std::fmt::Debug)>) {}
305 - [The result of dereferences are no longer promoted to `'static`.][47408]
309 const PAIR: &(i32, i32) = &(0, 1);
310 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
313 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
314 - [`".e0"` will now no longer parse as `0.0` and will instead cause
316 - [Removed hoedown from rustdoc.][48274]
317 - [Bounds on higher-kinded lifetimes a hard error.][48326]
319 [46882]: https://github.com/rust-lang/rust/pull/46882
320 [47379]: https://github.com/rust-lang/rust/pull/47379
321 [47408]: https://github.com/rust-lang/rust/pull/47408
322 [47813]: https://github.com/rust-lang/rust/pull/47813
323 [48056]: https://github.com/rust-lang/rust/pull/48056
324 [48125]: https://github.com/rust-lang/rust/pull/48125
325 [48166]: https://github.com/rust-lang/rust/pull/48166
326 [48235]: https://github.com/rust-lang/rust/pull/48235
327 [48274]: https://github.com/rust-lang/rust/pull/48274
328 [48281]: https://github.com/rust-lang/rust/pull/48281
329 [48296]: https://github.com/rust-lang/rust/pull/48296
330 [48326]: https://github.com/rust-lang/rust/pull/48326
331 [48359]: https://github.com/rust-lang/rust/pull/48359
332 [48404]: https://github.com/rust-lang/rust/pull/48404
333 [48481]: https://github.com/rust-lang/rust/pull/48481
334 [48516]: https://github.com/rust-lang/rust/pull/48516
335 [48628]: https://github.com/rust-lang/rust/pull/48628
336 [48629]: https://github.com/rust-lang/rust/pull/48629
337 [48657]: https://github.com/rust-lang/rust/pull/48657
338 [48735]: https://github.com/rust-lang/rust/pull/48735
339 [48978]: https://github.com/rust-lang/rust/pull/48978
340 [49101]: https://github.com/rust-lang/rust/pull/49101
341 [49109]: https://github.com/rust-lang/rust/pull/49109
342 [49121]: https://github.com/rust-lang/rust/pull/49121
343 [49162]: https://github.com/rust-lang/rust/pull/49162
344 [49184]: https://github.com/rust-lang/rust/pull/49184
345 [49234]: https://github.com/rust-lang/rust/pull/49234
346 [49255]: https://github.com/rust-lang/rust/pull/49255
347 [49299]: https://github.com/rust-lang/rust/pull/49299
348 [49305]: https://github.com/rust-lang/rust/pull/49305
349 [49394]: https://github.com/rust-lang/rust/pull/49394
350 [49458]: https://github.com/rust-lang/rust/pull/49458
351 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
352 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
353 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
354 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
355 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
356 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
357 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
358 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
359 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
360 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
361 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
362 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
363 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
364 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
365 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
366 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
367 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
368 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
369 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
370 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
371 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
372 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
373 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
374 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
375 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
376 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
377 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
378 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
379 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
380 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
381 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
382 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
383 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
384 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
385 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
386 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
387 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
388 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
389 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
390 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
391 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
392 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
395 Version 1.25.0 (2018-03-29)
396 ==========================
400 - [Stabilised `#[repr(align(x))]`.][47006] [RFC 1358]
401 - [You can now use nested groups of imports.][47948]
402 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
403 - [You can now have `|` at the start of a match arm.][47947] e.g.
411 | Foo::B => println!("AB"),
412 | Foo::C => println!("C"),
419 - [Upgraded to LLVM 6.][47828]
420 - [Added `-C lto=val` option.][47521]
421 - [Added `i586-unknown-linux-musl` target][47282]
425 - [Impl Send for `process::Command` on Unix.][47760]
426 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
427 - [`UnsafeCell::into_inner` is now safe.][47204]
428 - [Implement libstd for CloudABI.][47268]
429 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
430 - [Implement `AsRef<Path>` for Component][46985]
431 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
432 - [Moved `Duration` to libcore.][46666]
436 - [`Location::column`]
439 The following functions can now be used in a constant expression.
440 eg. `static MINUTE: Duration = Duration::from_secs(60);`
441 - [`Duration::new`][47300]
442 - [`Duration::from_secs`][47300]
443 - [`Duration::from_millis`][47300]
447 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
448 - [`cargo new` now defaults to creating a binary crate, instead of a
449 library crate.][cargo/5029]
453 - [Rust by example is now shipped with new releases][46196]
457 - [Deprecated `net::lookup_host`.][47510]
458 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
459 - The borrow checker was sometimes incorrectly permitting overlapping borrows
460 around indexing operations (see [#47349][47349]). This has been fixed (which also
461 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
462 - [Removed deprecated unstable attribute `#[simd]`.][47251]
464 [33903]: https://github.com/rust-lang/rust/pull/33903
465 [47947]: https://github.com/rust-lang/rust/pull/47947
466 [47948]: https://github.com/rust-lang/rust/pull/47948
467 [47760]: https://github.com/rust-lang/rust/pull/47760
468 [47790]: https://github.com/rust-lang/rust/pull/47790
469 [47828]: https://github.com/rust-lang/rust/pull/47828
470 [47398]: https://github.com/rust-lang/rust/pull/47398
471 [47510]: https://github.com/rust-lang/rust/pull/47510
472 [47521]: https://github.com/rust-lang/rust/pull/47521
473 [47204]: https://github.com/rust-lang/rust/pull/47204
474 [47251]: https://github.com/rust-lang/rust/pull/47251
475 [47268]: https://github.com/rust-lang/rust/pull/47268
476 [47282]: https://github.com/rust-lang/rust/pull/47282
477 [47300]: https://github.com/rust-lang/rust/pull/47300
478 [47349]: https://github.com/rust-lang/rust/pull/47349
479 [46931]: https://github.com/rust-lang/rust/pull/46931
480 [46985]: https://github.com/rust-lang/rust/pull/46985
481 [47006]: https://github.com/rust-lang/rust/pull/47006
482 [46830]: https://github.com/rust-lang/rust/pull/46830
483 [46095]: https://github.com/rust-lang/rust/pull/46095
484 [46666]: https://github.com/rust-lang/rust/pull/46666
485 [46196]: https://github.com/rust-lang/rust/pull/46196
486 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
487 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
488 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
489 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
490 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
493 Version 1.24.1 (2018-03-01)
494 ==========================
496 - [Do not abort when unwinding through FFI][48251]
497 - [Emit UTF-16 files for linker arguments on Windows][48318]
498 - [Make the error index generator work again][48308]
499 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
501 [48251]: https://github.com/rust-lang/rust/issues/48251
502 [48308]: https://github.com/rust-lang/rust/issues/48308
503 [48318]: https://github.com/rust-lang/rust/issues/48318
504 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
507 Version 1.24.0 (2018-02-15)
508 ==========================
512 - [External `sysv64` ffi is now available.][46528]
513 eg. `extern "sysv64" fn foo () {}`
517 - [rustc now uses 16 codegen units by default for release builds.][46910]
518 For the fastest builds, utilize `codegen-units=1`.
519 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
520 - [Add `aarch64-unknown-openbsd` support][46760]
524 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
525 improvement in performance in the majority of cases.
526 - [`OsStr`'s `Debug` implementation is now lossless and consistent
527 with Windows.][46798]
528 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
529 - [impl `From<bool>` for `AtomicBool`][46293]
530 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
531 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
532 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
533 - [float::from_bits now just uses transmute.][46012] This provides
534 some optimisations from LLVM.
535 - [Copied `AsciiExt` methods onto `char`][46077]
536 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
537 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
538 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
539 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
543 - [`RefCell::replace`]
545 - [`atomic::spin_loop_hint`]
547 The following functions can now be used in a constant expression.
548 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
550 - [`AtomicBool::new`][46287]
551 - [`AtomicUsize::new`][46287]
552 - [`AtomicIsize::new`][46287]
553 - [`AtomicPtr::new`][46287]
554 - [`Cell::new`][46287]
555 - [`{integer}::min_value`][46287]
556 - [`{integer}::max_value`][46287]
557 - [`mem::size_of`][46287]
558 - [`mem::align_of`][46287]
559 - [`ptr::null`][46287]
560 - [`ptr::null_mut`][46287]
561 - [`RefCell::new`][46287]
562 - [`UnsafeCell::new`][46287]
566 - [Added a `workspace.default-members` config that
567 overrides implied `--all` in virtual workspaces.][cargo/4743]
568 - [Enable incremental by default on development builds.][cargo/4817] Also added
569 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
570 per-project or global basis respectively.
577 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
578 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
579 in accordance with IETF RFC 4291 §2.2.
580 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
581 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
582 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
583 - [Leading zeros in tuple struct members is now an error][47084]
584 - [`column!()` macro is one-based instead of zero-based][46977]
585 - [`fmt::Arguments` can no longer be shared across threads][45198]
586 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
587 - [Cargo sets a different working directory for the compiler][cargo/4788]
589 [44884]: https://github.com/rust-lang/rust/pull/44884
590 [45198]: https://github.com/rust-lang/rust/pull/45198
591 [45506]: https://github.com/rust-lang/rust/pull/45506
592 [45904]: https://github.com/rust-lang/rust/pull/45904
593 [45990]: https://github.com/rust-lang/rust/pull/45990
594 [46012]: https://github.com/rust-lang/rust/pull/46012
595 [46077]: https://github.com/rust-lang/rust/pull/46077
596 [46094]: https://github.com/rust-lang/rust/pull/46094
597 [46284]: https://github.com/rust-lang/rust/pull/46284
598 [46287]: https://github.com/rust-lang/rust/pull/46287
599 [46293]: https://github.com/rust-lang/rust/pull/46293
600 [46528]: https://github.com/rust-lang/rust/pull/46528
601 [46671]: https://github.com/rust-lang/rust/pull/46671
602 [46713]: https://github.com/rust-lang/rust/pull/46713
603 [46735]: https://github.com/rust-lang/rust/pull/46735
604 [46749]: https://github.com/rust-lang/rust/pull/46749
605 [46760]: https://github.com/rust-lang/rust/pull/46760
606 [46798]: https://github.com/rust-lang/rust/pull/46798
607 [46828]: https://github.com/rust-lang/rust/pull/46828
608 [46831]: https://github.com/rust-lang/rust/pull/46831
609 [46833]: https://github.com/rust-lang/rust/pull/46833
610 [46910]: https://github.com/rust-lang/rust/pull/46910
611 [46977]: https://github.com/rust-lang/rust/pull/46977
612 [47018]: https://github.com/rust-lang/rust/pull/47018
613 [47080]: https://github.com/rust-lang/rust/pull/47080
614 [47084]: https://github.com/rust-lang/rust/pull/47084
615 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
616 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
617 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
618 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
619 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
620 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
623 Version 1.23.0 (2018-01-04)
624 ==========================
628 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
629 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
630 Which should fix some confusing errors in some operations.
634 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
635 undefined behaviour.][45920]
636 - [rustc now suggests renaming import if names clash.][45660]
637 - [Display errors/warnings correctly when there are zero-width or
638 wide characters.][45711]
639 - [rustc now avoids unnecessary copies of arguments that are
640 simple bindings][45380] This should improve memory usage on average by 5-10%.
641 - [Updated musl used to build musl rustc to 1.1.17][45393]
645 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
646 - [Implement Hash for raw pointers to unsized types][45483]
647 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
648 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
649 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
650 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
651 and `<*mut T>::as_mut`][44932]
652 - [Optimized `Thread::{park, unpark}` implementation][45524]
653 - [Improved `SliceExt::binary_search` performance.][45333]
654 - [impl `FromIterator<()>` for `()`][45379]
655 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
663 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
664 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
665 - [Added unit test checking to `cargo check`][cargo/4592]
666 - [Cargo now lets you install a specific version
667 using `cargo install --version`][cargo/4637]
671 - [Releases now ship with the Cargo book documentation.][45692]
672 - [rustdoc now prints rendering warnings on every run.][45324]
676 - [Changes have been made to type equality to make it more correct,
677 in rare cases this could break some code.][45853] [Tracking issue for
678 further information][45852]
679 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
680 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
681 Android 9, the minimum supported version is Android 14.
682 - [Bumped the minimum LLVM to 3.9][45326]
684 [44042]: https://github.com/rust-lang/rust/pull/44042
685 [44932]: https://github.com/rust-lang/rust/pull/44932
686 [45267]: https://github.com/rust-lang/rust/pull/45267
687 [45324]: https://github.com/rust-lang/rust/pull/45324
688 [45326]: https://github.com/rust-lang/rust/pull/45326
689 [45333]: https://github.com/rust-lang/rust/pull/45333
690 [45379]: https://github.com/rust-lang/rust/pull/45379
691 [45380]: https://github.com/rust-lang/rust/pull/45380
692 [45393]: https://github.com/rust-lang/rust/pull/45393
693 [45435]: https://github.com/rust-lang/rust/pull/45435
694 [45483]: https://github.com/rust-lang/rust/pull/45483
695 [45524]: https://github.com/rust-lang/rust/pull/45524
696 [45571]: https://github.com/rust-lang/rust/pull/45571
697 [45580]: https://github.com/rust-lang/rust/pull/45580
698 [45610]: https://github.com/rust-lang/rust/pull/45610
699 [45660]: https://github.com/rust-lang/rust/pull/45660
700 [45692]: https://github.com/rust-lang/rust/pull/45692
701 [45711]: https://github.com/rust-lang/rust/pull/45711
702 [45772]: https://github.com/rust-lang/rust/pull/45772
703 [45852]: https://github.com/rust-lang/rust/issues/45852
704 [45853]: https://github.com/rust-lang/rust/pull/45853
705 [45887]: https://github.com/rust-lang/rust/pull/45887
706 [45920]: https://github.com/rust-lang/rust/pull/45920
707 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
708 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
709 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
712 Version 1.22.1 (2017-11-22)
713 ==========================
715 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
717 [46183]: https://github.com/rust-lang/rust/pull/46183
719 Version 1.22.0 (2017-11-22)
720 ==========================
724 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
725 - [Now accepts underscores in unicode escapes][43716]
726 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
727 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
731 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
732 - [rustc will no longer inline in codegen units when compiling for debug][45075]
733 This should decrease compile times for debug builds.
734 - [strict memory alignment now enabled on ARMv6][45094]
735 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
739 - [Allow atomic operations up to 32 bits
740 on `armv5te_unknown_linux_gnueabi`][44978]
741 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
742 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
743 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
744 - [Properly detect overflow in `Instant += Duration`.][44220]
745 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
746 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
747 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
754 - [Cargo will now build multi file examples in subdirectories of the `examples`
755 folder that have a `main.rs` file.][cargo/4496]
756 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
757 the old format will continue to work and can be updated with `cargo update`.
758 - [Now supports vendoring git repositories][cargo/3992]
762 - [`libbacktrace` is now available on Apple platforms.][44251]
763 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
764 This now lets you specify that a given code example will fail to compile.
768 - [The minimum Android version that rustc can build for has been bumped
769 to `4.0` from `2.3`][45656]
770 - [Allowing `T op= &T` for numeric types has broken some type
771 inference cases][45480]
774 [42526]: https://github.com/rust-lang/rust/pull/42526
775 [43017]: https://github.com/rust-lang/rust/pull/43017
776 [43716]: https://github.com/rust-lang/rust/pull/43716
777 [43949]: https://github.com/rust-lang/rust/pull/43949
778 [44015]: https://github.com/rust-lang/rust/pull/44015
779 [44220]: https://github.com/rust-lang/rust/pull/44220
780 [44251]: https://github.com/rust-lang/rust/pull/44251
781 [44287]: https://github.com/rust-lang/rust/pull/44287
782 [44303]: https://github.com/rust-lang/rust/pull/44303
783 [44456]: https://github.com/rust-lang/rust/pull/44456
784 [44466]: https://github.com/rust-lang/rust/pull/44466
785 [44895]: https://github.com/rust-lang/rust/pull/44895
786 [44966]: https://github.com/rust-lang/rust/pull/44966
787 [44978]: https://github.com/rust-lang/rust/pull/44978
788 [45041]: https://github.com/rust-lang/rust/pull/45041
789 [45064]: https://github.com/rust-lang/rust/pull/45064
790 [45075]: https://github.com/rust-lang/rust/pull/45075
791 [45094]: https://github.com/rust-lang/rust/pull/45094
792 [45095]: https://github.com/rust-lang/rust/pull/45095
793 [45480]: https://github.com/rust-lang/rust/issues/45480
794 [45656]: https://github.com/rust-lang/rust/pull/45656
795 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
796 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
797 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
804 Version 1.21.0 (2017-10-12)
805 ==========================
809 - [You can now use static references for literals.][43838]
813 let x: &'static u32 = &0;
816 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
819 my_macro!(Vec<i32>::new); // Always worked
820 my_macro!(Vec::<i32>::new); // Now works
825 - [Upgraded jemalloc to 4.5.0][43911]
826 - [Enabled unwinding panics on Redox][43917]
827 - [Now runs LLVM in parallel during translation phase.][43506]
828 This should reduce peak memory usage.
832 - [Generate builtin impls for `Clone` for all arrays and tuples that
833 are `T: Clone`][43690]
834 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
835 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
836 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
841 [`std::mem::discriminant`]
845 - [You can now call `cargo install` with multiple package names][cargo/4216]
846 - [Cargo commands inside a virtual workspace will now implicitly
847 pass `--all`][cargo/4335]
848 - [Added a `[patch]` section to `Cargo.toml` to handle
849 prepublication dependencies][cargo/4123] [RFC 1969]
850 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
851 like patterns][cargo/4270]
852 - [Added the `--all-targets` option][cargo/4400]
853 - [Using required dependencies as a feature is now deprecated and emits
854 a warning][cargo/4364]
859 - [Cargo docs are moving][43916]
860 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
861 - [The rustdoc book is now available][43863]
862 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
863 - [Added a preview of RLS has been made available through rustup][44204]
864 Install with `rustup component add rls-preview`
865 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
866 Previously only showed `std::os::unix`.
870 - [Changes in method matching against higher-ranked types][43880] This may cause
871 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
872 - [rustc's JSON error output's byte position start at top of file.][42973]
873 Was previously relative to the rustc's internal `CodeMap` struct which
874 required the unstable library `libsyntax` to correctly use.
875 - [`unused_results` lint no longer ignores booleans][43728]
877 [42565]: https://github.com/rust-lang/rust/pull/42565
878 [42973]: https://github.com/rust-lang/rust/pull/42973
879 [43348]: https://github.com/rust-lang/rust/pull/43348
880 [43459]: https://github.com/rust-lang/rust/pull/43459
881 [43506]: https://github.com/rust-lang/rust/pull/43506
882 [43540]: https://github.com/rust-lang/rust/pull/43540
883 [43690]: https://github.com/rust-lang/rust/pull/43690
884 [43728]: https://github.com/rust-lang/rust/pull/43728
885 [43838]: https://github.com/rust-lang/rust/pull/43838
886 [43863]: https://github.com/rust-lang/rust/pull/43863
887 [43880]: https://github.com/rust-lang/rust/pull/43880
888 [43911]: https://github.com/rust-lang/rust/pull/43911
889 [43916]: https://github.com/rust-lang/rust/pull/43916
890 [43917]: https://github.com/rust-lang/rust/pull/43917
891 [44204]: https://github.com/rust-lang/rust/pull/44204
892 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
893 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
894 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
895 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
896 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
897 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
898 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
899 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
900 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
902 Version 1.20.0 (2017-08-31)
903 ===========================
907 - [Associated constants are now stabilised.][42809]
908 - [A lot of macro bugs are now fixed.][42913]
913 - [Struct fields are now properly coerced to the expected field type.][42807]
914 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
915 `wasm32-experimental-emscripten` target.
916 - [Changed some of the error messages to be more helpful.][42033]
917 - [Add support for RELRO(RELocation Read-Only) for platforms that support
919 - [rustc now reports the total number of errors on compilation failure][43015]
920 previously this was only the number of errors in the pass that failed.
921 - [Expansion in rustc has been sped up 29x.][42533]
922 - [added `msp430-none-elf` target.][43099]
923 - [rustc will now suggest one-argument enum variant to fix type mismatch when
925 - [Fixes backtraces on Redox][43228]
926 - [rustc now identifies different versions of same crate when absolute paths of
927 different types match in an error message.][42826]
933 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
934 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
936 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
937 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
938 - [Impl `Clone` for `DefaultHasher`.][42799]
939 - [Impl `Sync` for `SyncSender`.][42397]
940 - [Impl `FromStr` for `char`][42271]
941 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
943 - [allow messages in the `unimplemented!()` macro.][42155]
944 ie. `unimplemented!("Waiting for 1.21 to be stable")`
945 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
946 - [Upgrade to Unicode 10.0.0][42999]
947 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
948 - [Skip the main thread's manual stack guard on Linux][43072]
949 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
950 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
952 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
957 - [`CStr::into_c_string`]
958 - [`CString::as_c_str`]
959 - [`CString::into_boxed_c_str`]
962 - [`Chain::into_inner`]
963 - [`Option::get_or_insert_with`]
964 - [`Option::get_or_insert`]
965 - [`OsStr::into_os_string`]
966 - [`OsString::into_boxed_os_str`]
969 - [`Utf8Error::error_len`]
970 - [`char::EscapeDebug`]
971 - [`char::escape_debug`]
977 - [`mem::ManuallyDrop`]
978 - [`slice::sort_unstable_by_key`]
979 - [`slice::sort_unstable_by`]
980 - [`slice::sort_unstable`]
981 - [`str::from_boxed_utf8_unchecked`]
982 - [`str::as_bytes_mut`]
983 - [`str::as_bytes_mut`]
984 - [`str::from_utf8_mut`]
985 - [`str::from_utf8_unchecked_mut`]
987 - [`str::get_unchecked_mut`]
988 - [`str::get_unchecked`]
990 - [`str::into_boxed_bytes`]
995 - [Cargo API token location moved from `~/.cargo/config` to
996 `~/.cargo/credentials`.][cargo/3978]
997 - [Cargo will now build `main.rs` binaries that are in sub-directories of
998 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
999 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1000 - [You can now specify version of a binary when installed through
1001 `cargo install` using `--vers`.][cargo/4229]
1002 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1003 failure.][cargo/4248]
1004 - [Changed the convention around which file is the crate root.][cargo/4259]
1005 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1006 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1011 - [Functions with `'static` in their return types will now not be as usable as
1012 if they were using lifetime parameters instead.][42417]
1013 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1014 takes the sign of NaN into account where previously didn't.][42430]
1016 [42033]: https://github.com/rust-lang/rust/pull/42033
1017 [42155]: https://github.com/rust-lang/rust/pull/42155
1018 [42271]: https://github.com/rust-lang/rust/pull/42271
1019 [42397]: https://github.com/rust-lang/rust/pull/42397
1020 [42417]: https://github.com/rust-lang/rust/pull/42417
1021 [42430]: https://github.com/rust-lang/rust/pull/42430
1022 [42431]: https://github.com/rust-lang/rust/pull/42431
1023 [42533]: https://github.com/rust-lang/rust/pull/42533
1024 [42571]: https://github.com/rust-lang/rust/pull/42571
1025 [42613]: https://github.com/rust-lang/rust/pull/42613
1026 [42799]: https://github.com/rust-lang/rust/pull/42799
1027 [42807]: https://github.com/rust-lang/rust/pull/42807
1028 [42809]: https://github.com/rust-lang/rust/pull/42809
1029 [42822]: https://github.com/rust-lang/rust/pull/42822
1030 [42826]: https://github.com/rust-lang/rust/pull/42826
1031 [42854]: https://github.com/rust-lang/rust/pull/42854
1032 [42913]: https://github.com/rust-lang/rust/pull/42913
1033 [42999]: https://github.com/rust-lang/rust/pull/42999
1034 [43011]: https://github.com/rust-lang/rust/pull/43011
1035 [43015]: https://github.com/rust-lang/rust/pull/43015
1036 [43072]: https://github.com/rust-lang/rust/pull/43072
1037 [43077]: https://github.com/rust-lang/rust/pull/43077
1038 [43097]: https://github.com/rust-lang/rust/pull/43097
1039 [43099]: https://github.com/rust-lang/rust/pull/43099
1040 [43170]: https://github.com/rust-lang/rust/pull/43170
1041 [43178]: https://github.com/rust-lang/rust/pull/43178
1042 [43185]: https://github.com/rust-lang/rust/pull/43185
1043 [43228]: https://github.com/rust-lang/rust/pull/43228
1044 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1045 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1046 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1047 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1048 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1049 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1050 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1051 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1052 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1053 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1054 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1055 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1056 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1057 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1058 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1059 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1060 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1061 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1062 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1063 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1064 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1065 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1066 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1067 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1068 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1069 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1070 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1071 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1072 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1073 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1074 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1075 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1076 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1077 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1078 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1079 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1080 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1081 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1082 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1085 Version 1.19.0 (2017-07-20)
1086 ===========================
1091 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1092 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1093 - [Macro recursion limit increased to 1024 from 64.][41676]
1094 - [Added lint for detecting unused macros.][41907]
1095 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1096 For example: `let x = loop { break 7; };`
1097 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1098 contain `Copy` types and cannot have a `Drop` implementation.
1099 Example: `union Foo { bar: u8, baz: usize }`
1100 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1101 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1106 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1107 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1108 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1109 you should use `--target armv7-linux-androideabi`.
1110 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1111 - [Minor optimisation of string operations.][42037]
1112 - [Compiler error message is now `aborting due to previous error(s)` instead of
1113 `aborting due to N previous errors`][42150] This was previously inaccurate and
1114 would only count certain kinds of errors.
1115 - [The compiler now supports Visual Studio 2017][42225]
1116 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1117 - [Added a lot][42264] of [new error codes][42302]
1118 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1119 libraries with C Run-time Libraries(CRT) to be statically linked.
1120 - [Fixed various ARM codegen bugs][42740]
1125 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1126 `Extend<Cow<'a, str>>`][41449]
1127 - [`Vec` now implements `From<&mut [T]>`][41530]
1128 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1129 - [`SplitWhitespace` now implements `Clone`][41659]
1130 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1132 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1133 macros, but for printing to stderr.
1138 - [`OsString::shrink_to_fit`]
1141 - [`thread::ThreadId`]
1146 - [Build scripts can now add environment variables to the environment
1147 the crate is being compiled in.
1148 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1149 - [Subcommands now replace the current process rather than spawning a new
1150 child process][cargo/3970]
1151 - [Workspace members can now accept glob file patterns][cargo/3979]
1152 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1153 the members in a given workspace.][cargo/3988]
1154 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1155 - [Target directory path is now in the cargo metadata][cargo/4022]
1156 - [Cargo no longer checks out a local working directory for the
1157 crates.io index][cargo/4026] This should provide smaller file size for the
1158 registry, and improve cloning times, especially on Windows machines.
1159 - [Added an `--exclude` option for excluding certain packages when using the
1160 `--all` option][cargo/4031]
1161 - [Cargo will now automatically retry when receiving a 5xx error
1162 from crates.io][cargo/4032]
1163 - [The `--features` option now accepts multiple comma or space
1164 delimited values.][cargo/4084]
1165 - [Added support for custom target specific runners][cargo/3954]
1170 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1172 - [Rust will now release XZ compressed packages][rust-installer/57]
1173 - [rustup will now prefer to download rust packages with
1174 XZ compression][rustup/1100] over GZip packages.
1175 - [Added the ability to escape `#` in rust documentation][41785] By adding
1176 additional `#`'s ie. `##` is now `#`
1181 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1182 - [`-Z` flags are now no longer allowed to be used on the stable
1183 compiler.][41751] This has been a warning for a year previous to this.
1184 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1185 longer works][42844]. Users should migrate to the built-in `check`
1186 command, which has been available since 1.16.
1187 - [Ending a float literal with `._` is now a hard error.
1188 Example: `42._` .][41946]
1189 - [Any use of a private `extern crate` outside of its module is now a
1190 hard error.][36886] This was previously a warning.
1191 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1192 relative while the `::` prefix makes a path absolute, but was ignored and the
1193 path was relative regardless.
1194 - [Floating point constants in match patterns is now a hard error][36890]
1195 This was previously a warning.
1196 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1197 match patterns is now a hard error][36891] This was previously a warning.
1198 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1200 - [From the pound escape, lines consisting of multiple `#`s are
1202 - [It is an error to re-export private enum variants][42460]. This is
1203 known to break a number of crates that depend on an older version of
1205 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1206 to use it to find the linker, and the build will fail where it did
1207 not previously][42607]
1209 [36886]: https://github.com/rust-lang/rust/issues/36886
1210 [36888]: https://github.com/rust-lang/rust/issues/36888
1211 [36890]: https://github.com/rust-lang/rust/issues/36890
1212 [36891]: https://github.com/rust-lang/rust/issues/36891
1213 [36892]: https://github.com/rust-lang/rust/issues/36892
1214 [37406]: https://github.com/rust-lang/rust/issues/37406
1215 [39983]: https://github.com/rust-lang/rust/pull/39983
1216 [41145]: https://github.com/rust-lang/rust/pull/41145
1217 [41192]: https://github.com/rust-lang/rust/pull/41192
1218 [41258]: https://github.com/rust-lang/rust/pull/41258
1219 [41370]: https://github.com/rust-lang/rust/pull/41370
1220 [41449]: https://github.com/rust-lang/rust/pull/41449
1221 [41530]: https://github.com/rust-lang/rust/pull/41530
1222 [41624]: https://github.com/rust-lang/rust/pull/41624
1223 [41656]: https://github.com/rust-lang/rust/pull/41656
1224 [41659]: https://github.com/rust-lang/rust/pull/41659
1225 [41676]: https://github.com/rust-lang/rust/pull/41676
1226 [41751]: https://github.com/rust-lang/rust/pull/41751
1227 [41764]: https://github.com/rust-lang/rust/pull/41764
1228 [41785]: https://github.com/rust-lang/rust/pull/41785
1229 [41873]: https://github.com/rust-lang/rust/pull/41873
1230 [41907]: https://github.com/rust-lang/rust/pull/41907
1231 [41946]: https://github.com/rust-lang/rust/pull/41946
1232 [42016]: https://github.com/rust-lang/rust/pull/42016
1233 [42037]: https://github.com/rust-lang/rust/pull/42037
1234 [42068]: https://github.com/rust-lang/rust/pull/42068
1235 [42150]: https://github.com/rust-lang/rust/pull/42150
1236 [42162]: https://github.com/rust-lang/rust/pull/42162
1237 [42225]: https://github.com/rust-lang/rust/pull/42225
1238 [42264]: https://github.com/rust-lang/rust/pull/42264
1239 [42302]: https://github.com/rust-lang/rust/pull/42302
1240 [42460]: https://github.com/rust-lang/rust/issues/42460
1241 [42607]: https://github.com/rust-lang/rust/issues/42607
1242 [42740]: https://github.com/rust-lang/rust/pull/42740
1243 [42844]: https://github.com/rust-lang/rust/issues/42844
1244 [42948]: https://github.com/rust-lang/rust/pull/42948
1245 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1246 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1247 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1248 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1249 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1250 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1251 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1252 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1253 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1254 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1255 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1256 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1257 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1258 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1259 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1260 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1261 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1262 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1263 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1264 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1265 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1266 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1269 Version 1.18.0 (2017-06-08)
1270 ===========================
1275 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1276 make the item visible to just that module tree. Also accepts the keyword
1277 `crate` to make something public to the whole crate but not users of the
1278 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1279 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1280 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1281 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1282 types like `Write + Send`, trailing `+` are now supported in trait objects,
1283 and better error reporting for trait objects starting with `?Sized`.
1284 - [0e+10 is now a valid floating point literal][40589]
1285 - [Now warns if you bind a lifetime parameter to 'static][40734]
1286 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1287 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1288 representation in some cases.][40377]
1293 - [rustc can now emit mir with `--emit mir`][39891]
1294 - [Improved LLVM IR for trivial functions][40367]
1295 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1296 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1297 opportunities found through profiling
1298 - [Improved backtrace formatting when panicking][38165]
1303 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1304 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1305 iteration or reallocation.
1306 - [Simplified HashMap Bucket interface][40561] provides performance
1307 improvements for iterating and cloning.
1308 - [Specialize Vec::from_elem to use calloc][40409]
1309 - [Fixed Race condition in fs::create_dir_all][39799]
1310 - [No longer caching stdio on Windows][40516]
1311 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1312 2.50%~ faster and in one case now 12.50% faster.
1313 - [Optimized `AtomicBool::fetch_nand`][41143]
1318 - [`Child::try_wait`]
1319 - [`HashMap::retain`]
1320 - [`HashSet::retain`]
1322 - [`TcpStream::peek`]
1323 - [`UdpSocket::peek`]
1324 - [`UdpSocket::peek_from`]
1329 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1330 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1331 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1332 - [Added Android build support][cargo/3885]
1333 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1334 of a certain type, for example `cargo build --bins` will build all
1336 - [Added support for haiku][cargo/3952]
1341 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1342 - [Added rust-windbg script for better debugging on Windows][39983]
1343 - [Rust now uses the official cross compiler for NetBSD][40612]
1344 - [rustdoc now accepts `#` at the start of files][40828]
1345 - [Fixed jemalloc support for musl][41168]
1350 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1351 always placed after the sign if it exists and before the digits. With the `#`
1352 flag the zeroes are placed after the prefix and before the digits.
1353 - [Due to the struct field optimisation][40377], using `transmute` on structs
1354 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1355 always been undefined behavior, but is now more likely to break in practice.
1356 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1357 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1358 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1359 - [Overlapping inherent `impl`s are now a hard error][40728]
1360 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1361 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1362 `out.asm` and `out.ll` instead of only one of the filetypes.
1363 - [ calling a function that returns `Self` will no longer work][41805] when
1364 the size of `Self` cannot be statically determined.
1365 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1366 this has caused a few regressions namely:
1368 - Changed the link order of local static/dynamic libraries (respecting the
1369 order on given rather than having the compiler reorder).
1370 - Changed how MinGW is linked, native code linked to dynamic libraries
1371 may require manually linking to the gcc support library (for the native
1374 [38165]: https://github.com/rust-lang/rust/pull/38165
1375 [39799]: https://github.com/rust-lang/rust/pull/39799
1376 [39891]: https://github.com/rust-lang/rust/pull/39891
1377 [39983]: https://github.com/rust-lang/rust/pull/39983
1378 [40043]: https://github.com/rust-lang/rust/pull/40043
1379 [40241]: https://github.com/rust-lang/rust/pull/40241
1380 [40338]: https://github.com/rust-lang/rust/pull/40338
1381 [40367]: https://github.com/rust-lang/rust/pull/40367
1382 [40377]: https://github.com/rust-lang/rust/pull/40377
1383 [40409]: https://github.com/rust-lang/rust/pull/40409
1384 [40516]: https://github.com/rust-lang/rust/pull/40516
1385 [40556]: https://github.com/rust-lang/rust/pull/40556
1386 [40561]: https://github.com/rust-lang/rust/pull/40561
1387 [40589]: https://github.com/rust-lang/rust/pull/40589
1388 [40612]: https://github.com/rust-lang/rust/pull/40612
1389 [40723]: https://github.com/rust-lang/rust/pull/40723
1390 [40728]: https://github.com/rust-lang/rust/pull/40728
1391 [40731]: https://github.com/rust-lang/rust/pull/40731
1392 [40734]: https://github.com/rust-lang/rust/pull/40734
1393 [40805]: https://github.com/rust-lang/rust/pull/40805
1394 [40807]: https://github.com/rust-lang/rust/pull/40807
1395 [40828]: https://github.com/rust-lang/rust/pull/40828
1396 [40870]: https://github.com/rust-lang/rust/pull/40870
1397 [41085]: https://github.com/rust-lang/rust/pull/41085
1398 [41143]: https://github.com/rust-lang/rust/pull/41143
1399 [41168]: https://github.com/rust-lang/rust/pull/41168
1400 [41270]: https://github.com/rust-lang/rust/issues/41270
1401 [41469]: https://github.com/rust-lang/rust/pull/41469
1402 [41805]: https://github.com/rust-lang/rust/issues/41805
1403 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1404 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1405 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1406 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1407 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1408 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1409 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1410 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1411 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1412 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1413 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1414 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1415 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1416 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1419 Version 1.17.0 (2017-04-27)
1420 ===========================
1425 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1426 * [Fields of structs may be initialized without duplicating the field/variable
1427 names][39761]. [RFC 1682]
1428 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1429 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1430 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1431 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1432 `'b`. Soundness fix.
1433 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1434 * [Static variables may contain references to other statics][40027]
1439 * [Exit quickly on only `--emit dep-info`][40336]
1440 * [Make `-C relocation-model` more correctly determine whether the linker
1441 creates a position-independent executable][40245]
1442 * [Add `-C overflow-checks` to directly control whether integer overflow
1444 * [The rustc type checker now checks items on demand instead of in a single
1445 in-order pass][40008]. This is mostly an internal refactoring in support of
1446 future work, including incremental type checking, but also resolves [RFC
1447 1647], allowing `Self` to appear in `impl` `where` clauses.
1448 * [Optimize vtable loads][39995]
1449 * [Turn off vectorization for Emscripten targets][39990]
1450 * [Provide suggestions for unknown macros imported with `use`][39953]
1451 * [Fix ICEs in path resolution][39939]
1452 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1453 * [Add clearer error message using `&str + &str`][39116]
1464 * [`Ordering::then`]
1465 * [`Ordering::then_with`]
1466 * [`BTreeMap::range`]
1467 * [`BTreeMap::range_mut`]
1468 * [`collections::Bound`]
1469 * [`process::abort`]
1470 * [`ptr::read_unaligned`]
1471 * [`ptr::write_unaligned`]
1472 * [`Result::expect_err`]
1475 * [`Cell::into_inner`]
1481 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1482 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1483 * [`String` implements `FromIterator<&char>`][40028]
1484 * `Box` [implements][40009] a number of new conversions:
1485 `From<Box<str>> for String`,
1486 `From<Box<[T]>> for Vec<T>`,
1487 `From<Box<CStr>> for CString`,
1488 `From<Box<OsStr>> for OsString`,
1489 `From<Box<Path>> for PathBuf`,
1490 `Into<Box<str>> for String`,
1491 `Into<Box<[T]>> for Vec<T>`,
1492 `Into<Box<CStr>> for CString`,
1493 `Into<Box<OsStr>> for OsString`,
1494 `Into<Box<Path>> for PathBuf`,
1495 `Default for Box<str>`,
1496 `Default for Box<CStr>`,
1497 `Default for Box<OsStr>`,
1498 `From<&CStr> for Box<CStr>`,
1499 `From<&OsStr> for Box<OsStr>`,
1500 `From<&Path> for Box<Path>`
1501 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1502 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1503 * [Slightly optimize `slice::sort`][39538]
1504 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1505 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1506 `Box<str>` implements `From<&str>`][39438]
1507 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1508 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1509 * [`format!` estimates the needed capacity before writing a string][39356]
1510 * [Support unprivileged symlink creation in Windows][38921]
1511 * [`PathBuf` implements `Default`][38764]
1512 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1513 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1514 and poor hash functions.
1519 * [Add `cargo check --all`][cargo/3731]
1520 * [Add an option to ignore SSL revocation checking][cargo/3699]
1521 * [Add `cargo run --package`][cargo/3691]
1522 * [Add `required_features`][cargo/3667]
1523 * [Assume `build.rs` is a build script][cargo/3664]
1524 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1529 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1531 * [The "Unstable Book" documents nightly-only features][ubook]
1532 * [Improve the style of the sidebar in rustdoc output][40265]
1533 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1534 * [Fix MSP430 breakage due to `i128`][40257]
1535 * [Preliminary Solaris/SPARCv9 support][39903]
1536 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1537 run without installing the MSVC runtime.
1538 * [`rustdoc --test` includes file names in test names][39788]
1539 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1540 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1541 * [Initial support for `aarch64-unknown-freebsd`][39491]
1542 * [Initial support for `i686-unknown-netbsd`][39426]
1543 * [This release no longer includes the old makefile build system][39431]. Rust
1544 is built with a custom build system, written in Rust, and with Cargo.
1545 * [Add Debug implementations for libcollection structs][39002]
1546 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1547 * [`--test-threads=0` produces an error][38945]
1548 * [`rustup` installs documentation by default][40526]
1549 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1550 WinDbg and Visual Studio to improve the debugging experience.
1555 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1556 workaround, either use MSVC 2015 or run vcvars.bat.
1557 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1558 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1559 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1561 * [`format!` and `Display::to_string` panic if an underlying formatting
1562 implementation returns an error][40117]. Previously the error was silently
1563 ignored. It is incorrect for `write_fmt` to return an error when writing
1565 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1566 crates were marked stable and could be accessed from the stable toolchain.
1567 * [Rust git source no longer includes vendored crates][39728]. Those that need
1568 to build with vendored crates should build from release tarballs.
1569 * [Fix inert attributes from `proc_macro_derives`][39572]
1570 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1571 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1573 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1574 existing code generally ignores the type of dead-code unless a type-hint is
1575 provided; this can cause surprising inference interactions particularly around
1576 defaulting. The new code uniformly ignores the result type of dead-code.
1577 * [Tuple-struct constructors with private fields are no longer visible][38932]
1578 * [Lifetime parameters that do not appear in the arguments are now considered
1579 early-bound][38897], resolving a soundness bug (#[32330]). The
1580 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1582 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1583 * [Make transmuting from fn item types to pointer-sized types a hard
1586 [27787]: https://github.com/rust-lang/rust/issues/27787
1587 [32330]: https://github.com/rust-lang/rust/issues/32330
1588 [34198]: https://github.com/rust-lang/rust/pull/34198
1589 [38161]: https://github.com/rust-lang/rust/pull/38161
1590 [38368]: https://github.com/rust-lang/rust/pull/38368
1591 [38584]: https://github.com/rust-lang/rust/issues/38584
1592 [38661]: https://github.com/rust-lang/rust/pull/38661
1593 [38764]: https://github.com/rust-lang/rust/pull/38764
1594 [38864]: https://github.com/rust-lang/rust/issues/38864
1595 [38897]: https://github.com/rust-lang/rust/pull/38897
1596 [38921]: https://github.com/rust-lang/rust/pull/38921
1597 [38932]: https://github.com/rust-lang/rust/pull/38932
1598 [38945]: https://github.com/rust-lang/rust/pull/38945
1599 [38981]: https://github.com/rust-lang/rust/pull/38981
1600 [39002]: https://github.com/rust-lang/rust/pull/39002
1601 [39116]: https://github.com/rust-lang/rust/pull/39116
1602 [39193]: https://github.com/rust-lang/rust/pull/39193
1603 [39265]: https://github.com/rust-lang/rust/pull/39265
1604 [39356]: https://github.com/rust-lang/rust/pull/39356
1605 [39372]: https://github.com/rust-lang/rust/pull/39372
1606 [39426]: https://github.com/rust-lang/rust/pull/39426
1607 [39431]: https://github.com/rust-lang/rust/pull/39431
1608 [39438]: https://github.com/rust-lang/rust/pull/39438
1609 [39440]: https://github.com/rust-lang/rust/pull/39440
1610 [39485]: https://github.com/rust-lang/rust/pull/39485
1611 [39491]: https://github.com/rust-lang/rust/pull/39491
1612 [39518]: https://github.com/rust-lang/rust/pull/39518
1613 [39538]: https://github.com/rust-lang/rust/pull/39538
1614 [39572]: https://github.com/rust-lang/rust/pull/39572
1615 [39633]: https://github.com/rust-lang/rust/pull/39633
1616 [39642]: https://github.com/rust-lang/rust/pull/39642
1617 [39728]: https://github.com/rust-lang/rust/pull/39728
1618 [39761]: https://github.com/rust-lang/rust/pull/39761
1619 [39788]: https://github.com/rust-lang/rust/pull/39788
1620 [39793]: https://github.com/rust-lang/rust/pull/39793
1621 [39837]: https://github.com/rust-lang/rust/pull/39837
1622 [39843]: https://github.com/rust-lang/rust/pull/39843
1623 [39851]: https://github.com/rust-lang/rust/pull/39851
1624 [39903]: https://github.com/rust-lang/rust/pull/39903
1625 [39939]: https://github.com/rust-lang/rust/pull/39939
1626 [39953]: https://github.com/rust-lang/rust/pull/39953
1627 [39960]: https://github.com/rust-lang/rust/pull/39960
1628 [39990]: https://github.com/rust-lang/rust/pull/39990
1629 [39995]: https://github.com/rust-lang/rust/pull/39995
1630 [40008]: https://github.com/rust-lang/rust/pull/40008
1631 [40009]: https://github.com/rust-lang/rust/pull/40009
1632 [40027]: https://github.com/rust-lang/rust/pull/40027
1633 [40028]: https://github.com/rust-lang/rust/pull/40028
1634 [40037]: https://github.com/rust-lang/rust/pull/40037
1635 [40117]: https://github.com/rust-lang/rust/pull/40117
1636 [40166]: https://github.com/rust-lang/rust/pull/40166
1637 [40245]: https://github.com/rust-lang/rust/pull/40245
1638 [40257]: https://github.com/rust-lang/rust/pull/40257
1639 [40261]: https://github.com/rust-lang/rust/pull/40261
1640 [40265]: https://github.com/rust-lang/rust/pull/40265
1641 [40319]: https://github.com/rust-lang/rust/pull/40319
1642 [40336]: https://github.com/rust-lang/rust/pull/40336
1643 [40526]: https://github.com/rust-lang/rust/pull/40526
1644 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1645 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1646 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1647 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1648 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1649 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1650 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1651 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1652 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1653 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1654 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1655 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1656 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1657 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1658 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1659 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1660 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1661 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1662 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1663 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1664 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1665 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1666 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1667 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1668 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1669 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1670 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1671 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1672 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1673 [mdbook]: https://crates.io/crates/mdbook
1674 [ubook]: https://doc.rust-lang.org/unstable-book/
1677 Version 1.16.0 (2017-03-16)
1678 ===========================
1683 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1684 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1685 match patterns][38069]
1686 * [Clean up semantics of `self` in an import list][38313]
1687 * [`Self` may appear in `impl` headers][38920]
1688 * [`Self` may appear in struct expressions][39282]
1693 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1694 a `.rmeta` file containing only crate metadata][38571]. This can be
1695 used by tools like the Rust Language Service to perform
1696 metadata-only builds.
1697 * [Levenshtein based typo suggestions now work in most places, while
1698 previously they worked only for fields and sometimes for local
1699 variables][38927]. Together with the overhaul of "no
1700 resolution"/"unexpected resolution" errors (#[38154]) they result in
1701 large and systematic improvement in resolution diagnostics.
1702 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1704 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1705 * [`rustc` no longer attempts to provide "consider using an explicit
1706 lifetime" suggestions][37057]. They were inaccurate.
1711 * [`VecDeque::truncate`]
1712 * [`VecDeque::resize`]
1713 * [`String::insert_str`]
1714 * [`Duration::checked_add`]
1715 * [`Duration::checked_sub`]
1716 * [`Duration::checked_div`]
1717 * [`Duration::checked_mul`]
1720 * [`SocketAddr::is_ipv4`]
1721 * [`SocketAddr::is_ipv6`]
1722 * [`IpAddr::is_ipv4`]
1723 * [`IpAddr::is_ipv6`]
1725 * [`Vec::dedup_by_key`]
1726 * [`Result::unwrap_or_default`]
1727 * [`<*const T>::wrapping_offset`]
1728 * [`<*mut T>::wrapping_offset`]
1729 * `CommandExt::creation_flags`
1730 * [`File::set_permissions`]
1731 * [`String::split_off`]
1736 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1737 their argument by `Borrow` parameter][37761]
1738 * [All public types in std implement `Debug`][38006]
1739 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1740 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1741 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1743 * [std: Fix partial writes in `LineWriter`][38062]
1744 * [std: Clamp max read/write sizes on Unix][38062]
1745 * [Use more specific panic message for `&str` slicing errors][38066]
1746 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1747 functionality cannot be achieved in std currently.
1748 * [`writeln!`, like `println!`, now accepts a form with no string
1749 or formatting arguments, to just print a newline][38469]
1750 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1751 * [Reduce the size of static data in `std_unicode::tables`][38781]
1752 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1753 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1755 * [`Duration` implements `Sum`][38712]
1756 * [`String` implements `ToSocketAddrs`][39048]
1761 * [The `cargo check` command does a type check of a project without
1762 building it][cargo/3296]
1763 * [crates.io will display CI badges from Travis and AppVeyor, if
1764 specified in Cargo.toml][cargo/3546]
1765 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1766 * [Compilation profiles accept integer values for `debug`, in addition
1767 to `true` and `false`. These are passed to `rustc` as the value to
1768 `-C debuginfo`][cargo/3534]
1769 * [Implement `cargo --version --verbose`][cargo/3604]
1770 * [All builds now output 'dep-info' build dependencies compatible with
1771 make and ninja][cargo/3557]
1772 * [Build all workspace members with `build --all`][cargo/3511]
1773 * [Document all workspace members with `doc --all`][cargo/3515]
1774 * [Path deps outside workspace are not members][cargo/3443]
1779 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1780 the path to the Rust implementation][38589]
1781 * [The `armv7-linux-androideabi` target no longer enables NEON
1782 extensions, per Google's ABI guide][38413]
1783 * [The stock standard library can be compiled for Redox OS][38401]
1784 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1786 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1788 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1793 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1794 match patterns][38069]
1795 * In this release, references to uninhabited types can not be
1796 pattern-matched. This was accidentally allowed in 1.15.
1797 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1798 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1800 * [Clean up semantics of `self` in an import list][38313]
1801 * Reimplemented lifetime elision. This change was almost entirely compatible
1802 with existing code, but it did close a number of small bugs and loopholes,
1803 as well as being more accepting in some other [cases][41105].
1805 [37057]: https://github.com/rust-lang/rust/pull/37057
1806 [37761]: https://github.com/rust-lang/rust/pull/37761
1807 [38006]: https://github.com/rust-lang/rust/pull/38006
1808 [38051]: https://github.com/rust-lang/rust/pull/38051
1809 [38062]: https://github.com/rust-lang/rust/pull/38062
1810 [38062]: https://github.com/rust-lang/rust/pull/38622
1811 [38066]: https://github.com/rust-lang/rust/pull/38066
1812 [38069]: https://github.com/rust-lang/rust/pull/38069
1813 [38131]: https://github.com/rust-lang/rust/pull/38131
1814 [38154]: https://github.com/rust-lang/rust/pull/38154
1815 [38274]: https://github.com/rust-lang/rust/pull/38274
1816 [38304]: https://github.com/rust-lang/rust/pull/38304
1817 [38313]: https://github.com/rust-lang/rust/pull/38313
1818 [38314]: https://github.com/rust-lang/rust/pull/38314
1819 [38327]: https://github.com/rust-lang/rust/pull/38327
1820 [38401]: https://github.com/rust-lang/rust/pull/38401
1821 [38413]: https://github.com/rust-lang/rust/pull/38413
1822 [38469]: https://github.com/rust-lang/rust/pull/38469
1823 [38559]: https://github.com/rust-lang/rust/pull/38559
1824 [38571]: https://github.com/rust-lang/rust/pull/38571
1825 [38580]: https://github.com/rust-lang/rust/pull/38580
1826 [38589]: https://github.com/rust-lang/rust/pull/38589
1827 [38670]: https://github.com/rust-lang/rust/pull/38670
1828 [38712]: https://github.com/rust-lang/rust/pull/38712
1829 [38726]: https://github.com/rust-lang/rust/pull/38726
1830 [38781]: https://github.com/rust-lang/rust/pull/38781
1831 [38798]: https://github.com/rust-lang/rust/pull/38798
1832 [38909]: https://github.com/rust-lang/rust/pull/38909
1833 [38920]: https://github.com/rust-lang/rust/pull/38920
1834 [38927]: https://github.com/rust-lang/rust/pull/38927
1835 [39048]: https://github.com/rust-lang/rust/pull/39048
1836 [39282]: https://github.com/rust-lang/rust/pull/39282
1837 [39379]: https://github.com/rust-lang/rust/pull/39379
1838 [41105]: https://github.com/rust-lang/rust/issues/41105
1839 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1840 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1841 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
1842 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
1843 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
1844 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
1845 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
1846 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
1847 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
1848 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
1849 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
1850 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
1851 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
1852 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
1853 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
1854 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
1855 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
1856 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
1857 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
1858 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
1859 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
1860 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
1861 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
1862 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
1863 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
1864 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
1865 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
1866 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
1867 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
1868 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1871 Version 1.15.1 (2017-02-09)
1872 ===========================
1874 * [Fix IntoIter::as_mut_slice's signature][39466]
1875 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
1877 [39466]: https://github.com/rust-lang/rust/pull/39466
1878 [39523]: https://github.com/rust-lang/rust/pull/39523
1881 Version 1.15.0 (2017-02-02)
1882 ===========================
1887 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
1888 stable. This allows popular code-generating crates like Serde and Diesel to
1889 work ergonomically. [RFC 1681].
1890 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
1891 with curly braces][36868]. Part of [RFC 1506].
1892 * [A number of minor changes to name resolution have been activated][37127].
1893 They add up to more consistent semantics, allowing for future evolution of
1894 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1895 details of what is different. The breaking changes here have been transitioned
1896 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1897 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
1899 * [`?Sized` can be used in `where` clauses][37791]
1900 * [There is now a limit on the size of monomorphized types and it can be
1901 modified with the `#![type_size_limit]` crate attribute, similarly to
1902 the `#![recursion_limit]` attribute][37789]
1907 * [On Windows, the compiler will apply dllimport attributes when linking to
1908 extern functions][37973]. Additional attributes and flags can control which
1909 library kind is linked and its name. [RFC 1717].
1910 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1911 * [The `--test` flag works with procedural macro crates][38107]
1912 * [Fix `extern "aapcs" fn` ABI][37814]
1913 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
1914 * [The `format!` expander recognizes incorrect `printf` and shell-style
1915 formatting directives and suggests the correct format][37613].
1916 * [Only report one error for all unused imports in an import list][37456]
1918 Compiler Performance
1919 --------------------
1921 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
1922 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
1923 * [Don't clone in `UnificationTable::probe`][37848]
1924 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
1925 * [Use small vectors in type walker][37760]
1926 * [Macro expansion performance was improved][37701]
1927 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
1928 * [Replace FNV with a faster hash function][37229]
1933 * [`std::iter::Iterator::min_by`]
1934 * [`std::iter::Iterator::max_by`]
1935 * [`std::os::*::fs::FileExt`]
1936 * [`std::sync::atomic::Atomic*::get_mut`]
1937 * [`std::sync::atomic::Atomic*::into_inner`]
1938 * [`std::vec::IntoIter::as_slice`]
1939 * [`std::vec::IntoIter::as_mut_slice`]
1940 * [`std::sync::mpsc::Receiver::try_iter`]
1941 * [`std::os::unix::process::CommandExt::before_exec`]
1942 * [`std::rc::Rc::strong_count`]
1943 * [`std::rc::Rc::weak_count`]
1944 * [`std::sync::Arc::strong_count`]
1945 * [`std::sync::Arc::weak_count`]
1946 * [`std::char::encode_utf8`]
1947 * [`std::char::encode_utf16`]
1948 * [`std::cell::Ref::clone`]
1949 * [`std::io::Take::into_inner`]
1954 * [The standard sorting algorithm has been rewritten for dramatic performance
1955 improvements][38192]. It is a hybrid merge sort, drawing influences from
1956 Timsort. Previously it was a naive merge sort.
1957 * [`Iterator::nth` no longer has a `Sized` bound][38134]
1958 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
1960 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
1961 and `char_indices().last()`][37882]
1962 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
1963 * [Chinese characters display correctly in `fmt::Debug`][37855]
1964 * [Derive `Default` for `Duration`][37699]
1965 * [Support creation of anonymous pipes on WinXP/2k][37677]
1966 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
1967 * [Don't pass overlapped handles to processes][38835]
1972 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1973 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1974 should instead check the variable at runtime with `std::env`. That the value
1975 was set at build time was a bug, and incorrect when cross-compiling. This
1976 change is known to cause breakage.
1977 * [Add `--all` flag to `cargo test`][cargo/3221]
1978 * [Compile statically against the MSVC CRT][cargo/3363]
1979 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
1980 * [Link OpenSSL statically on OSX][cargo/3311]
1981 * [Apply new fingerprinting to build dir outputs][cargo/3310]
1982 * [Test for bad path overrides with summaries][cargo/3336]
1983 * [Require `cargo install --vers` to take a semver version][cargo/3338]
1984 * [Fix retrying crate downloads for network errors][cargo/3348]
1985 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
1986 * [Emit more info on --message-format=json][cargo/3319]
1987 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
1988 * [Don't ignore errors in workspace manifest][cargo/3409]
1989 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
1994 * [Test runners (binaries built with `--test`) now support a `--list` argument
1995 that lists the tests it contains][38185]
1996 * [Test runners now support a `--exact` argument that makes the test filter
1997 match exactly, instead of matching only a substring of the test name][38181]
1998 * [rustdoc supports a `--playground-url` flag][37763]
1999 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2004 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2005 continue to be used in this release by passing `--disable-rustbuild` to the
2006 configure script, but they will be deleted soon. Note that the new build
2007 system uses a different on-disk layout that will likely affect any scripts
2009 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2011 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2012 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2018 * [A number of minor changes to name resolution have been activated][37127].
2019 They add up to more consistent semantics, allowing for future evolution of
2020 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2021 details of what is different. The breaking changes here have been transitioned
2022 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2023 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2024 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2025 should instead check the variable at runtime with `std::env`. That the value
2026 was set at build time was a bug, and incorrect when cross-compiling. This
2027 change is known to cause breakage.
2028 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2029 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2030 1.10 and is now an error by default. It will become a hard error in the near
2032 * [The semantics relating modules to file system directories are changing in
2033 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2034 lint, which is a warning in this release, and will become a hard error in the
2036 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2037 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2038 the underlying iterator][37834]
2040 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2041 [33685]: https://github.com/rust-lang/rust/issues/33685
2042 [36868]: https://github.com/rust-lang/rust/pull/36868
2043 [37127]: https://github.com/rust-lang/rust/pull/37127
2044 [37229]: https://github.com/rust-lang/rust/pull/37229
2045 [37456]: https://github.com/rust-lang/rust/pull/37456
2046 [37527]: https://github.com/rust-lang/rust/pull/37527
2047 [37602]: https://github.com/rust-lang/rust/pull/37602
2048 [37613]: https://github.com/rust-lang/rust/pull/37613
2049 [37615]: https://github.com/rust-lang/rust/pull/37615
2050 [37636]: https://github.com/rust-lang/rust/pull/37636
2051 [37627]: https://github.com/rust-lang/rust/pull/37627
2052 [37642]: https://github.com/rust-lang/rust/pull/37642
2053 [37677]: https://github.com/rust-lang/rust/pull/37677
2054 [37699]: https://github.com/rust-lang/rust/pull/37699
2055 [37701]: https://github.com/rust-lang/rust/pull/37701
2056 [37705]: https://github.com/rust-lang/rust/pull/37705
2057 [37749]: https://github.com/rust-lang/rust/pull/37749
2058 [37760]: https://github.com/rust-lang/rust/pull/37760
2059 [37763]: https://github.com/rust-lang/rust/pull/37763
2060 [37764]: https://github.com/rust-lang/rust/pull/37764
2061 [37789]: https://github.com/rust-lang/rust/pull/37789
2062 [37791]: https://github.com/rust-lang/rust/pull/37791
2063 [37814]: https://github.com/rust-lang/rust/pull/37814
2064 [37817]: https://github.com/rust-lang/rust/pull/37817
2065 [37834]: https://github.com/rust-lang/rust/pull/37834
2066 [37848]: https://github.com/rust-lang/rust/pull/37848
2067 [37855]: https://github.com/rust-lang/rust/pull/37855
2068 [37882]: https://github.com/rust-lang/rust/pull/37882
2069 [37888]: https://github.com/rust-lang/rust/pull/37888
2070 [37973]: https://github.com/rust-lang/rust/pull/37973
2071 [37979]: https://github.com/rust-lang/rust/pull/37979
2072 [38086]: https://github.com/rust-lang/rust/pull/38086
2073 [38107]: https://github.com/rust-lang/rust/pull/38107
2074 [38117]: https://github.com/rust-lang/rust/pull/38117
2075 [38134]: https://github.com/rust-lang/rust/pull/38134
2076 [38146]: https://github.com/rust-lang/rust/pull/38146
2077 [38181]: https://github.com/rust-lang/rust/pull/38181
2078 [38182]: https://github.com/rust-lang/rust/pull/38182
2079 [38185]: https://github.com/rust-lang/rust/pull/38185
2080 [38192]: https://github.com/rust-lang/rust/pull/38192
2081 [38279]: https://github.com/rust-lang/rust/pull/38279
2082 [38835]: https://github.com/rust-lang/rust/pull/38835
2083 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2084 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2085 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2086 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2087 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2088 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2089 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2090 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2091 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2092 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2093 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2094 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2095 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2096 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2097 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2098 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2099 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2100 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2101 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2102 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2103 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2104 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2105 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2106 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2107 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2108 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2109 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2110 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2111 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2112 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2113 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2114 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2115 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2116 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2117 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2118 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2119 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2120 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2123 Version 1.14.0 (2016-12-22)
2124 ===========================
2129 * [`..` matches multiple tuple fields in enum variants, structs
2130 and tuples][36843]. [RFC 1492].
2131 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2132 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2133 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2134 dereferencing][36822]
2139 * [Mark enums with non-zero discriminant as non-zero][37224]
2140 * [Lower-case `static mut` names are linted like other
2141 statics and consts][37162]
2142 * [Fix ICE on some macros in const integer positions
2143 (e.g. `[u8; m!()]`)][36819]
2144 * [Improve error message and snippet for "did you mean `x`"][36798]
2145 * [Add a panic-strategy field to the target specification][36794]
2146 * [Include LLVM version in `--version --verbose`][37200]
2148 Compile-time Optimizations
2149 --------------------------
2151 * [Improve macro expansion performance][37569]
2152 * [Shrink `Expr_::ExprInlineAsm`][37445]
2153 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2154 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2155 * [Avoid more allocations when compiling html5ever][37373]
2156 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2157 * [Avoid some allocations in the macro parser][37318]
2158 * [Use a faster deflate setting][37298]
2159 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2160 during interning of slices][37270]
2161 * [Optimize `write_metadata`][37267]
2162 * [Don't process obligation forest cycles when stalled][37231]
2163 * [Avoid many `CrateConfig` clones][37161]
2164 * [Optimize `Substs::super_fold_with`][37108]
2165 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2166 * [Speed up `plug_leaks`][36917]
2171 * [`println!()`, with no arguments, prints newline][36825].
2172 Previously, an empty string was required to achieve the same.
2173 * [`Wrapping` impls standard binary and unary operators, as well as
2174 the `Sum` and `Product` iterators][37356]
2175 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2177 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2178 `VecDeque` iterators][37315]
2179 * [Improve `SipHasher` performance on small values][37312]
2180 * [Add Iterator trait TrustedLen to enable better FromIterator /
2182 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2183 * [`ReadDir` implements `Debug`][37221]
2184 * [Implement `RefUnwindSafe` for atomic types][37178]
2185 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2186 * [Avoid allocations in `Decoder::read_str`][37064]
2187 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2188 * [Impl `Debug` for raw pointers to unsized data][36880]
2189 * [Don't reuse `HashMap` random seeds][37470]
2190 * [The internal memory layout of `HashMap` is more cache-friendly, for
2191 significant improvements in some operations][36692]
2192 * [`HashMap` uses less memory on 32-bit architectures][36595]
2193 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2198 * [Expose rustc cfg values to build scripts][cargo/3243]
2199 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2200 * [Fix passing --features when testing multiple packages][cargo/3280]
2201 * [Use a single profile set per workspace][cargo/3249]
2202 * [Load `replace` sections from lock files][cargo/3220]
2203 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2208 * [rustup is the recommended Rust installation method][1.14rustup]
2209 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2210 S390x. These are [tier 2] platforms and may have major defects. Follow the
2211 instructions on the website to install, or add the targets to an existing
2212 installation with `rustup target add`. The new target triples are:
2213 - `mips-unknown-linux-gnu`
2214 - `mipsel-unknown-linux-gnu`
2215 - `mips64-unknown-linux-gnuabi64`
2216 - `mips64el-unknown-linux-gnuabi64 `
2217 - `powerpc-unknown-linux-gnu`
2218 - `powerpc64-unknown-linux-gnu`
2219 - `powerpc64le-unknown-linux-gnu`
2220 - `s390x-unknown-linux-gnu `
2221 * This release includes target (std) builds for ARM Linux running MUSL
2222 libc. These are [tier 2] platforms and may have major defects. Add the
2223 following triples to an existing rustup installation with `rustup target add`:
2224 - `arm-unknown-linux-musleabi`
2225 - `arm-unknown-linux-musleabihf`
2226 - `armv7-unknown-linux-musleabihf`
2227 * This release includes [experimental support for WebAssembly][1.14wasm], via
2228 the `wasm32-unknown-emscripten` target. This target is known to have major
2229 defects. Please test, report, and fix.
2230 * rustup no longer installs documentation by default. Run `rustup
2231 component add rust-docs` to install.
2232 * [Fix line stepping in debugger][37310]
2233 * [Enable line number debuginfo in releases][37280]
2238 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2239 * [Add support for Fuchsia OS][37313]
2240 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2245 * [A number of forward-compatibility lints used by the compiler
2246 to gradually introduce language changes have been converted
2247 to deny by default][36894]:
2248 - ["use of inaccessible extern crate erroneously allowed"][36886]
2249 - ["type parameter default erroneously allowed in invalid location"][36887]
2250 - ["detects super or self keywords at the beginning of global path"][36888]
2251 - ["two overlapping inherent impls define an item with the same name
2252 were erroneously allowed"][36889]
2253 - ["floating-point constants cannot be used in patterns"][36890]
2254 - ["constants of struct or enum type can only be used in a pattern if
2255 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2256 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2257 * [Prohibit patterns in trait methods without bodies][37378]
2258 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2259 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2260 * [The `$crate` macro variable is accepted in fewer locations][37213]
2261 * [Impls specifying extra region requirements beyond the trait
2262 they implement are rejected][37167]
2263 * [Enums may not be unsized][37111]. Unsized enums are intended to
2264 work but never have. For now they are forbidden.
2265 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2267 [tier 2]: https://forge.rust-lang.org/platform-support.html
2268 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2269 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2270 [36430]: https://github.com/rust-lang/rust/pull/36430
2271 [36595]: https://github.com/rust-lang/rust/pull/36595
2272 [36595]: https://github.com/rust-lang/rust/pull/36595
2273 [36692]: https://github.com/rust-lang/rust/pull/36692
2274 [36767]: https://github.com/rust-lang/rust/pull/36767
2275 [36794]: https://github.com/rust-lang/rust/pull/36794
2276 [36798]: https://github.com/rust-lang/rust/pull/36798
2277 [36819]: https://github.com/rust-lang/rust/pull/36819
2278 [36822]: https://github.com/rust-lang/rust/pull/36822
2279 [36825]: https://github.com/rust-lang/rust/pull/36825
2280 [36843]: https://github.com/rust-lang/rust/pull/36843
2281 [36880]: https://github.com/rust-lang/rust/pull/36880
2282 [36886]: https://github.com/rust-lang/rust/issues/36886
2283 [36887]: https://github.com/rust-lang/rust/issues/36887
2284 [36888]: https://github.com/rust-lang/rust/issues/36888
2285 [36889]: https://github.com/rust-lang/rust/issues/36889
2286 [36890]: https://github.com/rust-lang/rust/issues/36890
2287 [36891]: https://github.com/rust-lang/rust/issues/36891
2288 [36892]: https://github.com/rust-lang/rust/issues/36892
2289 [36894]: https://github.com/rust-lang/rust/pull/36894
2290 [36917]: https://github.com/rust-lang/rust/pull/36917
2291 [36993]: https://github.com/rust-lang/rust/pull/36993
2292 [37037]: https://github.com/rust-lang/rust/pull/37037
2293 [37064]: https://github.com/rust-lang/rust/pull/37064
2294 [37094]: https://github.com/rust-lang/rust/pull/37094
2295 [37108]: https://github.com/rust-lang/rust/pull/37108
2296 [37111]: https://github.com/rust-lang/rust/pull/37111
2297 [37161]: https://github.com/rust-lang/rust/pull/37161
2298 [37162]: https://github.com/rust-lang/rust/pull/37162
2299 [37167]: https://github.com/rust-lang/rust/pull/37167
2300 [37178]: https://github.com/rust-lang/rust/pull/37178
2301 [37200]: https://github.com/rust-lang/rust/pull/37200
2302 [37213]: https://github.com/rust-lang/rust/pull/37213
2303 [37221]: https://github.com/rust-lang/rust/pull/37221
2304 [37224]: https://github.com/rust-lang/rust/pull/37224
2305 [37230]: https://github.com/rust-lang/rust/pull/37230
2306 [37231]: https://github.com/rust-lang/rust/pull/37231
2307 [37247]: https://github.com/rust-lang/rust/pull/37247
2308 [37267]: https://github.com/rust-lang/rust/pull/37267
2309 [37270]: https://github.com/rust-lang/rust/pull/37270
2310 [37273]: https://github.com/rust-lang/rust/pull/37273
2311 [37280]: https://github.com/rust-lang/rust/pull/37280
2312 [37298]: https://github.com/rust-lang/rust/pull/37298
2313 [37306]: https://github.com/rust-lang/rust/pull/37306
2314 [37310]: https://github.com/rust-lang/rust/pull/37310
2315 [37312]: https://github.com/rust-lang/rust/pull/37312
2316 [37313]: https://github.com/rust-lang/rust/pull/37313
2317 [37315]: https://github.com/rust-lang/rust/pull/37315
2318 [37318]: https://github.com/rust-lang/rust/pull/37318
2319 [37322]: https://github.com/rust-lang/rust/pull/37322
2320 [37326]: https://github.com/rust-lang/rust/pull/37326
2321 [37351]: https://github.com/rust-lang/rust/pull/37351
2322 [37356]: https://github.com/rust-lang/rust/pull/37356
2323 [37367]: https://github.com/rust-lang/rust/pull/37367
2324 [37373]: https://github.com/rust-lang/rust/pull/37373
2325 [37378]: https://github.com/rust-lang/rust/pull/37378
2326 [37389]: https://github.com/rust-lang/rust/pull/37389
2327 [37392]: https://github.com/rust-lang/rust/pull/37392
2328 [37427]: https://github.com/rust-lang/rust/pull/37427
2329 [37439]: https://github.com/rust-lang/rust/pull/37439
2330 [37445]: https://github.com/rust-lang/rust/pull/37445
2331 [37470]: https://github.com/rust-lang/rust/pull/37470
2332 [37569]: https://github.com/rust-lang/rust/pull/37569
2333 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2334 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2335 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2336 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2337 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2338 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2339 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2342 Version 1.13.0 (2016-11-10)
2343 ===========================
2348 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2349 errors, like the `try!` macro, described in [RFC 0243].
2350 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2351 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2352 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2353 * [Fix lifetime rules for 'if' conditions][36029]
2354 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2359 * [Add the `-C link-arg` argument][36574]
2360 * [Remove the old AST-based backend from rustc_trans][35764]
2361 * [Don't enable NEON by default on armv7 Linux][35814]
2362 * [Fix debug line number info for macro expansions][35238]
2363 * [Do not emit "class method" debuginfo for types that are not
2364 DICompositeType][36008]
2365 * [Warn about multiple conflicting #[repr] hints][34623]
2366 * [When sizing DST, don't double-count nested struct prefixes][36351]
2367 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2368 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2369 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2370 * [Expand macros without recursing to avoid stack overflows][36214]
2375 * [Replace macro backtraces with labeled local uses][35702]
2376 * [Improve error message for misplaced doc comments][33922]
2377 * [Buffer unix and lock windows to prevent message interleaving][35975]
2378 * [Update lifetime errors to specifically note temporaries][36171]
2379 * [Special case a few colors for Windows][36178]
2380 * [Suggest `use self` when such an import resolves][36289]
2381 * [Be more specific when type parameter shadows primitive type][36338]
2382 * Many minor improvements
2384 Compile-time Optimizations
2385 --------------------------
2387 * [Compute and cache HIR hashes at beginning][35854]
2388 * [Don't hash types in loan paths][36004]
2389 * [Cache projections in trans][35761]
2390 * [Optimize the parser's last token handling][36527]
2391 * [Only instantiate #[inline] functions in codegen units referencing
2392 them][36524]. This leads to big improvements in cases where crates export
2393 define many inline functions without using them directly.
2394 * [Lazily allocate TypedArena's first chunk][36592]
2395 * [Don't allocate during default HashSet creation][36734]
2402 * [`overflowing_abs`]
2403 * [`RefCell::try_borrow`]
2404 * [`RefCell::try_borrow_mut`]
2409 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2410 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2412 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2413 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2414 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2415 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2416 * [Use arc4rand on FreeBSD][35884]
2417 * [memrchr: Correct aligned offset computation][35969]
2418 * [Improve Demangling of Rust Symbols][36059]
2419 * [Use monotonic time in condition variables][35048]
2420 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2421 * [Implement conversion traits for `char`][35755]
2422 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2423 * [Zero first byte of CString on drop][36264]
2424 * [Inherit overflow checks for sum and product][36372]
2425 * [Add missing Eq implementations][36423]
2426 * [Implement `Debug` for `DirEntry`][36631]
2427 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2429 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2430 * [Implement more traits for `std::io::ErrorKind`][35911]
2431 * [Optimize BinaryHeap bounds checking][36072]
2432 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2433 `extend_with_element`][36355]
2434 * [Fix overflow checking in unsigned pow()][34942]
2439 * This release includes security fixes to both curl and OpenSSL.
2440 * [Fix transitive doctests when panic=abort][cargo/3021]
2441 * [Add --all-features flag to cargo][cargo/3038]
2442 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2443 * [Don't parse the home directory more than once][cargo/3078]
2444 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2445 * [Update OpenSSL to 1.0.2j][cargo/3121]
2446 * [Add license and license_file to cargo metadata output][cargo/3110]
2447 * [Make crates-io registry URL optional in config; ignore all changes to
2448 source.crates-io][cargo/3089]
2449 * [Don't download dependencies from other platforms][cargo/3123]
2450 * [Build transitive dev-dependencies when needed][cargo/3125]
2451 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2452 * [Avoid updating registry when adding existing deps][cargo/3144]
2453 * [Warn about path overrides that won't work][cargo/3136]
2454 * [Use workspaces during `cargo install`][cargo/3146]
2455 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2456 * [Add --message-format flag][cargo/3000]
2457 * [Pass target environment for rustdoc][cargo/3205]
2458 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2459 * [Update curl and curl-sys][cargo/3241]
2460 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2465 * [rustdoc: Add the `--sysroot` argument][36586]
2466 * [rustdoc: Fix a couple of issues with the search results][35655]
2467 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2468 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2469 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2474 * [Remove unmaintained style guide][35124]
2475 * [Add s390x support][36369]
2476 * [Initial work at Haiku OS support][36727]
2477 * [Add mips-uclibc targets][35734]
2478 * [Crate-ify compiler-rt into compiler-builtins][35021]
2479 * [Add rustc version info (git hash + date) to dist tarball][36213]
2480 * Many documentation improvements
2485 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2486 * [Deny (by default) transmuting from fn item types to pointer-sized
2487 types][34923]. Continuing the long transition to zero-sized fn items,
2489 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2491 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2492 * [Fix lifetime rules for 'if' conditions][36029].
2493 * [Inherit overflow checks for sum and product][36372].
2494 * [Forbid user-defined macros named "macro_rules"][36730].
2496 [33922]: https://github.com/rust-lang/rust/pull/33922
2497 [34623]: https://github.com/rust-lang/rust/pull/34623
2498 [34923]: https://github.com/rust-lang/rust/pull/34923
2499 [34942]: https://github.com/rust-lang/rust/pull/34942
2500 [34982]: https://github.com/rust-lang/rust/pull/34982
2501 [35021]: https://github.com/rust-lang/rust/pull/35021
2502 [35048]: https://github.com/rust-lang/rust/pull/35048
2503 [35074]: https://github.com/rust-lang/rust/pull/35074
2504 [35124]: https://github.com/rust-lang/rust/pull/35124
2505 [35234]: https://github.com/rust-lang/rust/pull/35234
2506 [35238]: https://github.com/rust-lang/rust/pull/35238
2507 [35354]: https://github.com/rust-lang/rust/pull/35354
2508 [35559]: https://github.com/rust-lang/rust/pull/35559
2509 [35585]: https://github.com/rust-lang/rust/pull/35585
2510 [35627]: https://github.com/rust-lang/rust/pull/35627
2511 [35655]: https://github.com/rust-lang/rust/pull/35655
2512 [35702]: https://github.com/rust-lang/rust/pull/35702
2513 [35707]: https://github.com/rust-lang/rust/pull/35707
2514 [35728]: https://github.com/rust-lang/rust/pull/35728
2515 [35734]: https://github.com/rust-lang/rust/pull/35734
2516 [35755]: https://github.com/rust-lang/rust/pull/35755
2517 [35761]: https://github.com/rust-lang/rust/pull/35761
2518 [35764]: https://github.com/rust-lang/rust/pull/35764
2519 [35814]: https://github.com/rust-lang/rust/pull/35814
2520 [35854]: https://github.com/rust-lang/rust/pull/35854
2521 [35871]: https://github.com/rust-lang/rust/pull/35871
2522 [35884]: https://github.com/rust-lang/rust/pull/35884
2523 [35911]: https://github.com/rust-lang/rust/pull/35911
2524 [35969]: https://github.com/rust-lang/rust/pull/35969
2525 [35975]: https://github.com/rust-lang/rust/pull/35975
2526 [36004]: https://github.com/rust-lang/rust/pull/36004
2527 [36008]: https://github.com/rust-lang/rust/pull/36008
2528 [36014]: https://github.com/rust-lang/rust/pull/36014
2529 [36029]: https://github.com/rust-lang/rust/pull/36029
2530 [36059]: https://github.com/rust-lang/rust/pull/36059
2531 [36072]: https://github.com/rust-lang/rust/pull/36072
2532 [36101]: https://github.com/rust-lang/rust/pull/36101
2533 [36104]: https://github.com/rust-lang/rust/pull/36104
2534 [36171]: https://github.com/rust-lang/rust/pull/36171
2535 [36173]: https://github.com/rust-lang/rust/pull/36173
2536 [36178]: https://github.com/rust-lang/rust/pull/36178
2537 [36213]: https://github.com/rust-lang/rust/pull/36213
2538 [36214]: https://github.com/rust-lang/rust/pull/36214
2539 [36264]: https://github.com/rust-lang/rust/pull/36264
2540 [36266]: https://github.com/rust-lang/rust/pull/36266
2541 [36289]: https://github.com/rust-lang/rust/pull/36289
2542 [36338]: https://github.com/rust-lang/rust/pull/36338
2543 [36351]: https://github.com/rust-lang/rust/pull/36351
2544 [36355]: https://github.com/rust-lang/rust/pull/36355
2545 [36369]: https://github.com/rust-lang/rust/pull/36369
2546 [36372]: https://github.com/rust-lang/rust/pull/36372
2547 [36423]: https://github.com/rust-lang/rust/pull/36423
2548 [36482]: https://github.com/rust-lang/rust/pull/36482
2549 [36505]: https://github.com/rust-lang/rust/pull/36505
2550 [36524]: https://github.com/rust-lang/rust/pull/36524
2551 [36527]: https://github.com/rust-lang/rust/pull/36527
2552 [36551]: https://github.com/rust-lang/rust/pull/36551
2553 [36574]: https://github.com/rust-lang/rust/pull/36574
2554 [36586]: https://github.com/rust-lang/rust/pull/36586
2555 [36592]: https://github.com/rust-lang/rust/pull/36592
2556 [36631]: https://github.com/rust-lang/rust/pull/36631
2557 [36639]: https://github.com/rust-lang/rust/pull/36639
2558 [36721]: https://github.com/rust-lang/rust/pull/36721
2559 [36727]: https://github.com/rust-lang/rust/pull/36727
2560 [36730]: https://github.com/rust-lang/rust/pull/36730
2561 [36734]: https://github.com/rust-lang/rust/pull/36734
2562 [36754]: https://github.com/rust-lang/rust/pull/36754
2563 [36995]: https://github.com/rust-lang/rust/pull/36995
2564 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2565 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2566 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2567 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2568 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2569 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2570 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2571 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2572 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2573 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2574 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2575 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2576 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2577 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2578 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2579 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2580 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2581 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2582 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2583 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2584 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2585 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2586 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
2587 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
2588 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
2589 [rustup]: https://www.rustup.rs
2590 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
2591 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
2592 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
2593 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
2594 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
2595 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
2596 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
2599 Version 1.12.1 (2016-10-20)
2600 ===========================
2605 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
2606 * [Confusion with double negation and booleans][36856]
2607 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
2608 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
2609 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
2610 * [Corrupted memory after updated to 1.12][36936]
2611 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
2612 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
2613 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
2615 [36381]: https://github.com/rust-lang/rust/issues/36381
2616 [36856]: https://github.com/rust-lang/rust/issues/36856
2617 [36875]: https://github.com/rust-lang/rust/issues/36875
2618 [36924]: https://github.com/rust-lang/rust/issues/36924
2619 [36926]: https://github.com/rust-lang/rust/issues/36926
2620 [36936]: https://github.com/rust-lang/rust/issues/36936
2621 [37026]: https://github.com/rust-lang/rust/issues/37026
2622 [37112]: https://github.com/rust-lang/rust/issues/37112
2623 [37153]: https://github.com/rust-lang/rust/issues/37153
2626 Version 1.12.0 (2016-09-29)
2627 ===========================
2632 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2633 This translation pass is far simpler than the previous AST->LLVM pass, and
2634 creates opportunities to perform new optimizations directly on the MIR. It
2635 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2636 * [`rustc` presents a new, more readable error format, along with
2637 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2638 Most common editors supporting Rust have been updated to work with it. It was
2639 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2644 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2645 This translation pass is far simpler than the previous AST->LLVM pass, and
2646 creates opportunities to perform new optimizations directly on the MIR. It
2647 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2648 * [Print the Rust target name, not the LLVM target name, with
2649 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2650 * [The computation of `TypeId` is correct in some cases where it was previously
2651 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2652 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2653 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2654 `--print relocation-models`, and `--print code-models` print the available
2655 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2656 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2657 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2658 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2659 These targets produce statically-linked binaries. There are no binary release
2665 * [`rustc` presents a new, more readable error format, along with
2666 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2667 Most common editors supporting Rust have been updated to work with it. It was
2668 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2669 * [In error descriptions, references are now described in plain English,
2670 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2671 * [In error type descriptions, unknown numeric types are named `{integer}` or
2672 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2673 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2678 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2679 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2680 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2681 useful](https://github.com/rust-lang/rust/pull/34908)
2682 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2683 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2684 * [Semicolons are properly required as statement delimiters inside
2685 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2686 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2691 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2692 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2693 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2694 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2695 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2696 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2697 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2698 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2699 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2700 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2701 Both on Unix and Windows.
2702 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2703 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2704 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2705 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2706 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2707 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2708 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2709 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2714 * [The `format!` macro and friends now allow a single argument to be formatted
2715 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2716 * [The lifetime bounds on `[T]::binary_search_by` and
2717 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2718 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2719 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2720 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2721 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2722 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2723 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2724 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2725 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2726 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2727 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2728 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2729 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2730 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2731 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2732 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2733 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2734 * [`mpsc::sync_channel` `Receiver`s return any available message before
2735 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2736 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2737 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2742 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2743 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2744 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2745 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2746 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2747 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2748 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2749 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2750 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2751 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2752 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2753 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2754 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2755 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2756 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2757 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2762 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2763 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2768 * [Test binaries now support a `--test-threads` argument to specify the number
2769 of threads used to run tests, and which acts the same as the
2770 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2771 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2772 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2773 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2774 * [Rust releases now come with source packages that can be installed by rustup
2775 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2776 The resulting source code can be used by tools and IDES, located in the
2777 sysroot under `lib/rustlib/src`.
2782 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2783 * Many minor improvements to the documentation.
2784 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2789 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2790 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2791 * [When formatting strings, if "precision" is specified, the "fill",
2792 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2793 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2796 Version 1.11.0 (2016-08-18)
2797 ===========================
2802 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2803 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2804 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2805 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2806 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2811 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2812 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2813 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2814 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2815 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2816 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2817 (in libcore - previously stabilized in libstd)
2818 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2819 (in libcore - previously stabilized in libstd)
2820 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2821 (in libcore - previously stabilized in libstd)
2822 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
2823 (in libcore - previously stabilized in libstd)
2824 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2825 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2826 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
2827 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
2832 * [The `thread_local!` macro supports multiple definitions in a single
2833 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
2834 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
2835 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
2836 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
2837 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
2838 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
2839 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
2840 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
2845 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
2846 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
2847 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
2848 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
2849 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
2850 and `-vv` prints warnings for all crates.
2851 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
2852 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
2853 This provides room for expansion by arbitrary tools.
2854 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
2855 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
2856 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
2857 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
2858 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
2859 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
2860 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
2865 * [Caching projections speeds up type check dramatically for some
2866 workloads](https://github.com/rust-lang/rust/pull/33816)
2867 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
2868 This hasher is faster, but is believed to provide sufficient
2869 protection from collision attacks.
2870 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
2875 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
2876 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
2877 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
2878 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
2879 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
2884 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
2885 * [When emitting debug info, rustc emits frame pointers for closures,
2886 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
2887 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2888 * Many more errors have been given error codes and extended
2890 * API documentation continues to be improved, with many new examples
2895 * [rustc no longer hangs when dependencies recursively re-export
2896 submodules](https://github.com/rust-lang/rust/pull/34542)
2897 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
2898 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
2899 rewritten](https://github.com/rust-lang/rust/pull/33895)
2900 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
2901 No targets use this yet, but it works toward AVR support.
2906 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
2907 * [The new follow-set rules that place restrictions on `macro_rules!`
2908 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
2909 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
2910 and has been a warning since 1.10.
2911 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
2912 This causes breakage in some corner cases.
2915 Version 1.10.0 (2016-07-07)
2916 ===========================
2921 * [Allow `concat_idents!` in type positions as well as in expression
2922 positions](https://github.com/rust-lang/rust/pull/33735).
2923 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
2924 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
2925 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
2926 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
2927 * [`panic!` can be converted to a runtime abort with the
2928 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
2929 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2930 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
2931 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
2932 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
2933 Note that Cargo does not yet directly support cdylibs.
2938 * `os::windows::fs::OpenOptionsExt::access_mode`
2939 * `os::windows::fs::OpenOptionsExt::share_mode`
2940 * `os::windows::fs::OpenOptionsExt::custom_flags`
2941 * `os::windows::fs::OpenOptionsExt::attributes`
2942 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
2943 * `os::unix::fs::OpenOptionsExt::custom_flags`
2944 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
2945 * `Default for sync::Weak`
2946 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
2947 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
2948 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
2949 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
2950 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
2951 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
2952 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
2953 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
2954 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
2955 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
2956 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
2957 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
2958 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
2959 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
2960 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
2961 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
2962 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
2963 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
2964 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
2965 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
2966 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
2967 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
2968 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
2969 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
2970 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
2971 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2972 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2973 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2974 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2975 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
2976 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
2977 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
2978 * Read/Write/RawFd impls for `UnixStream`
2979 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
2980 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
2981 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
2982 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
2983 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
2984 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
2985 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
2986 * RawFd impls for `UnixListener`
2987 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
2988 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
2989 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
2990 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
2991 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
2992 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
2993 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
2994 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
2995 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
2996 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
2997 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
2998 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
2999 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3000 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3001 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3002 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3003 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3004 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3005 * RawFd impls for `UnixDatagram`
3006 * `{BTree,Hash}Map::values_mut`
3007 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
3012 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3013 The semantics of this minor method are subtle and probably not what
3015 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3016 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3017 will fall back to `/dev/urandom` temporarily to avoid blocking
3018 during early boot](https://github.com/rust-lang/rust/pull/33086).
3019 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3020 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3021 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3022 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3023 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3024 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3025 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3029 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3030 This controls the runtime behavior of the `panic!` macro
3031 and can be either "unwind" (the default), or "abort".
3032 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3033 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3034 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3035 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3036 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3037 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3038 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3039 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3040 By default they are retried twice, which can be customized with the
3041 `net.retry` value in `.cargo/config`.
3042 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3043 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3044 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3045 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3046 Makes it possible to install multiple crates in parallel.
3047 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3048 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3049 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3050 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3051 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3052 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3057 * [rustc memory usage was reduced by refactoring the context used for
3058 type checking](https://github.com/rust-lang/rust/pull/33425).
3059 * [Speed up creation of `HashMap`s by caching the random keys used
3060 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3061 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3062 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3063 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3064 10x faster than the previous lookup tables.
3065 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3070 * Many incremental improvements to documentation and rustdoc.
3071 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3072 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3073 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3074 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3075 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3076 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3077 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3082 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3083 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3084 * [`std` no longer prints backtraces on platforms where the running
3085 module must be loaded with `env::current_exe`, which can't be relied
3086 on](https://github.com/rust-lang/rust/pull/33554).
3087 * This release includes std binaries for the i586-unknown-linux-gnu,
3088 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3089 i586 target is for old x86 hardware without SSE2, and the armv7
3090 target is for Android running on modern ARM architectures.
3091 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3092 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3093 * [On Unix the runtime aborts by calling `libc::abort` instead of
3094 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3095 * [Rust is now bootstrapped from the previous release of Rust,
3096 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3101 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3102 * [`target_env` for Linux ARM targets is just `gnu`, not
3103 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3104 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3105 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3106 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3107 Affects how macros are parsed.
3108 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3109 * [Feature-gated attributes on macro-generated macro invocations are
3110 now rejected](https://github.com/rust-lang/rust/pull/32791).
3111 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3112 This caused some minor changes to type inference.
3115 Version 1.9.0 (2016-05-26)
3116 ==========================
3121 * The `#[deprecated]` attribute when applied to an API will generate
3122 warnings when used. The warnings may be suppressed with
3123 `#[allow(deprecated)]`. [RFC 1270].
3124 * [`fn` item types are zero sized, and each `fn` names a unique
3125 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3126 `transmute` on a `fn` type will generate a warning for a few cycles,
3127 then will be converted to an error.
3128 * [Field and method resolution understand visibility, so private
3129 fields and methods cannot prevent the proper use of public fields
3130 and methods][1.9fv].
3131 * [The parser considers unicode codepoints in the
3132 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3138 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3139 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3140 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3141 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3142 * [`str::is_char_boundary`]
3143 * [`<*const T>::as_ref`]
3144 * [`<*mut T>::as_ref`]
3145 * [`<*mut T>::as_mut`]
3146 * [`AsciiExt::make_ascii_uppercase`]
3147 * [`AsciiExt::make_ascii_lowercase`]
3148 * [`char::decode_utf16`]
3149 * [`char::DecodeUtf16`]
3150 * [`char::DecodeUtf16Error`]
3151 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3152 * [`BTreeSet::take`]
3153 * [`BTreeSet::replace`]
3156 * [`HashSet::replace`]
3158 * [`OsString::with_capacity`]
3159 * [`OsString::clear`]
3160 * [`OsString::capacity`]
3161 * [`OsString::reserve`]
3162 * [`OsString::reserve_exact`]
3163 * [`OsStr::is_empty`]
3165 * [`std::os::unix::thread`]
3168 * [`JoinHandleExt::as_pthread_t`]
3169 * [`JoinHandleExt::into_pthread_t`]
3170 * [`HashSet::hasher`]
3171 * [`HashMap::hasher`]
3172 * [`CommandExt::exec`]
3173 * [`File::try_clone`]
3174 * [`SocketAddr::set_ip`]
3175 * [`SocketAddr::set_port`]
3176 * [`SocketAddrV4::set_ip`]
3177 * [`SocketAddrV4::set_port`]
3178 * [`SocketAddrV6::set_ip`]
3179 * [`SocketAddrV6::set_port`]
3180 * [`SocketAddrV6::set_flowinfo`]
3181 * [`SocketAddrV6::set_scope_id`]
3182 * [`slice::copy_from_slice`]
3183 * [`ptr::read_volatile`]
3184 * [`ptr::write_volatile`]
3185 * [`OpenOptions::create_new`]
3186 * [`TcpStream::set_nodelay`]
3187 * [`TcpStream::nodelay`]
3188 * [`TcpStream::set_ttl`]
3189 * [`TcpStream::ttl`]
3190 * [`TcpStream::set_only_v6`]
3191 * [`TcpStream::only_v6`]
3192 * [`TcpStream::take_error`]
3193 * [`TcpStream::set_nonblocking`]
3194 * [`TcpListener::set_ttl`]
3195 * [`TcpListener::ttl`]
3196 * [`TcpListener::set_only_v6`]
3197 * [`TcpListener::only_v6`]
3198 * [`TcpListener::take_error`]
3199 * [`TcpListener::set_nonblocking`]
3200 * [`UdpSocket::set_broadcast`]
3201 * [`UdpSocket::broadcast`]
3202 * [`UdpSocket::set_multicast_loop_v4`]
3203 * [`UdpSocket::multicast_loop_v4`]
3204 * [`UdpSocket::set_multicast_ttl_v4`]
3205 * [`UdpSocket::multicast_ttl_v4`]
3206 * [`UdpSocket::set_multicast_loop_v6`]
3207 * [`UdpSocket::multicast_loop_v6`]
3208 * [`UdpSocket::set_multicast_ttl_v6`]
3209 * [`UdpSocket::multicast_ttl_v6`]
3210 * [`UdpSocket::set_ttl`]
3211 * [`UdpSocket::ttl`]
3212 * [`UdpSocket::set_only_v6`]
3213 * [`UdpSocket::only_v6`]
3214 * [`UdpSocket::join_multicast_v4`]
3215 * [`UdpSocket::join_multicast_v6`]
3216 * [`UdpSocket::leave_multicast_v4`]
3217 * [`UdpSocket::leave_multicast_v6`]
3218 * [`UdpSocket::take_error`]
3219 * [`UdpSocket::connect`]
3220 * [`UdpSocket::send`]
3221 * [`UdpSocket::recv`]
3222 * [`UdpSocket::set_nonblocking`]
3227 * [`std::sync::Once` is poisoned if its initialization function
3229 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3230 * [Most types implement `fmt::Debug`][1.9db].
3231 * [The default buffer size used by `BufReader` and `BufWriter` was
3232 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3233 used by other languages.
3234 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3235 `Duration` additionally implements `*=` and `/=`][1.9ta].
3236 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3237 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3238 * [`Chain` implements `BufRead`][1.9ch].
3239 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3244 * [Cargo can now run concurrently][1.9cc].
3245 * [Top-level overrides allow specific revisions of crates to be
3246 overridden through the entire crate graph][1.9ct]. This is intended
3247 to make upgrades easier for large projects, by allowing crates to be
3248 forked temporarily until they've been upgraded and republished.
3249 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3250 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3251 on the commandline][1.9cf]. `rustc` arguments can also be specified
3252 in the `build.rustflags` configuration key.
3257 * [The time complexity of comparing variables for equivalence during type
3258 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3259 to major compilation time improvement in some scenarios.
3260 * [`ToString` is specialized for `str`, giving it the same performance
3261 as `to_owned`][1.9ts].
3262 * [Spawning processes with `Command::output` no longer creates extra
3264 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3265 for C-like enums][1.9cl].
3270 * [Passing the `--quiet` flag to a test runner will produce
3271 much-abbreviated output][1.9q].
3272 * The Rust Project now publishes std binaries for the
3273 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3274 `i586-pc-windows-msvc` targets.
3279 * [`std::sync::Once` is poisoned if its initialization function
3281 * [It is illegal to define methods with the same name in overlapping
3282 inherent `impl` blocks][1.9sn].
3283 * [`fn` item types are zero sized, and each `fn` names a unique
3284 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3285 `transmute` on a `fn` type will generate a warning for a few cycles,
3286 then will be converted to an error.
3287 * [Improvements to const evaluation may trigger new errors when integer
3288 literals are out of range][1.9ce].
3291 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3292 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3293 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3294 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3295 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3296 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3297 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3298 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3299 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3300 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3301 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3302 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3303 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3304 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3305 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3306 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3307 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3308 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3309 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3310 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3311 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3312 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3313 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3314 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3315 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3316 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3317 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3318 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3319 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3320 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3321 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3322 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3323 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3324 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3325 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3326 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3327 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3328 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3329 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3330 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3331 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3332 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3333 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3334 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3335 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3336 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3337 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3338 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3339 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3340 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3341 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3342 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3343 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3344 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3345 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3346 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3347 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3348 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3349 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3350 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3351 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3352 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3353 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3354 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3355 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3356 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3357 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3358 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3359 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3360 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3361 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3362 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3363 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3364 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3365 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3366 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3367 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3368 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3369 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3370 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3371 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3372 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3373 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3374 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3375 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3376 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3377 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3378 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3379 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3380 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3381 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3382 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3383 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3384 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3385 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3386 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3387 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3388 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3389 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3390 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3391 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3392 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3393 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3394 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3395 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3396 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3397 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3398 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3399 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3400 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3403 Version 1.8.0 (2016-04-14)
3404 ==========================
3409 * Rust supports overloading of compound assignment statements like
3410 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3411 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3412 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3414 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3415 addition to the non-braced form, `struct Foo;`. [RFC 218].
3421 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3422 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3425 * [`ptr::drop_in_place`]
3427 * [`time::SystemTime`]
3429 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3430 * [`Instant::elapsed`]
3431 * [`SystemTime::now`]
3432 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3433 * [`SystemTime::elapsed`]
3434 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3435 * [`SystemTimeError`]
3436 * [`SystemTimeError::duration`]
3437 * Various impls for `SystemTimeError`
3439 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3440 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3441 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3442 * [The `write!` and `writeln!` macros correctly emit errors if any of
3443 their arguments can't be formatted][1.8w].
3444 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3445 * [The Unix-specific `raw` modules, which contain a number of
3446 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3447 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3448 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3449 across platforms was making it difficult to implement `std`
3450 correctly. Those that need these definitions should use the `libc`
3452 * The Unix-specific `MetadataExt` traits, including
3453 `os::unix::fs::MetadataExt`, which expose values such as inode
3454 numbers [no longer return platform-specific types][1.8r], but
3455 instead return widened integers. [RFC 1415].
3456 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3457 * [Atomic loads and stores are not volatile][1.8a].
3458 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3463 * [Inlining hash functions lead to a 3% compile-time improvement in
3464 some workloads][1.8h].
3465 * When using jemalloc, its symbols are [unprefixed so that it
3466 overrides the libc malloc implementation][1.8h]. This means that for
3467 rustc, LLVM is now using jemalloc, which results in a 6%
3468 compile-time improvement on a specific workload.
3469 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3474 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3475 i686-pc-windows-msvc is now considered a tier-1 platform.
3476 * [The `--print targets` flag prints a list of supported targets][1.8t].
3477 * [The `--print cfg` flag prints the `cfg`s defined for the current
3479 * [`rustc` can be built with an new Cargo-based build system, written
3480 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3481 build system. To enable it configure with `configure --rustbuild`.
3482 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3483 variants while also indicating the total number of missing variants
3484 if more than 3][1.8m].
3485 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3486 * The Rust Project now publishes binary releases of the standard
3487 library for a number of tier-2 targets:
3488 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3489 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3490 `x86_64-rumprun-netbsd`. These can be installed with
3491 tools such as [multirust][1.8mr].
3496 * [`cargo init` creates a new Cargo project in the current
3497 directory][1.8ci]. It is otherwise like `cargo new`.
3498 * [Cargo has configuration keys for `-v` and
3499 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3500 `[term]` section of `.cargo/config`.
3501 * [Configuration keys that evaluate to strings or integers can be set
3502 via environment variables][1.8ce]. For example the `build.jobs` key
3503 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3504 precedence over config files.
3505 * [Target-specific dependencies support Rust `cfg` syntax for
3506 describing targets][1.8cfg] so that dependencies for multiple
3507 targets can be specified together. [RFC 1361].
3508 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3509 `RUSTDOC` take precedence over the `build.target-dir`,
3510 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3511 * [The child process tree is killed on Windows when Cargo is
3513 * [The `build.target` configuration value sets the target platform,
3514 like `--target`][1.8ct].
3519 * [Unstable compiler flags have been further restricted][1.8u]. Since
3520 1.0 `-Z` flags have been considered unstable, and other flags that
3521 were considered unstable additionally required passing `-Z
3522 unstable-options` to access. Unlike unstable language and library
3523 features though, these options have been accessible on the stable
3524 release channel. Going forward, *new unstable flags will not be
3525 available on the stable release channel*, and old unstable flags
3526 will warn about their usage. In the future, all unstable flags will
3527 be unavailable on the stable release channel.
3528 * [It is no longer possible to `match` on empty enum variants using
3529 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3530 * The Unix-specific `MetadataExt` traits, including
3531 `os::unix::fs::MetadataExt`, which expose values such as inode
3532 numbers [no longer return platform-specific types][1.8r], but
3533 instead return widened integers. [RFC 1415].
3534 * [Modules sourced from the filesystem cannot appear within arbitrary
3535 blocks, but only within other modules][1.8mf].
3536 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3537 * On Unix, [stack overflow triggers a runtime abort instead of a
3539 * [`Command::spawn` and its equivalents return an error if any of
3540 its command-line arguments contain interior `NUL`s][1.8n].
3541 * [Tuple and unit enum variants from other crates are in the type
3543 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3544 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3545 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3546 instead of `foo.lib`.
3549 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3550 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3551 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3552 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3553 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3554 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3555 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3556 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3557 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3558 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3559 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3560 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3561 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3562 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3563 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3564 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3565 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3566 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3567 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3568 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3569 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3570 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3571 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3572 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3573 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3574 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3575 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3576 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3577 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3578 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3579 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3580 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3581 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3582 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3583 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3584 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3585 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3586 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
3587 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
3588 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
3589 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
3590 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
3591 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
3592 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
3593 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
3594 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
3595 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
3596 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
3597 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
3598 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
3599 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
3600 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
3601 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
3602 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
3603 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
3604 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
3605 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
3606 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
3607 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
3608 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
3611 Version 1.7.0 (2016-03-03)
3612 ==========================
3619 * [`Path::strip_prefix`][] (renamed from relative_from)
3620 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3622 * [`Ipv4Addr::is_loopback`]
3623 * [`Ipv4Addr::is_private`]
3624 * [`Ipv4Addr::is_link_local`]
3625 * [`Ipv4Addr::is_multicast`]
3626 * [`Ipv4Addr::is_broadcast`]
3627 * [`Ipv4Addr::is_documentation`]
3629 * [`Ipv6Addr::is_unspecified`]
3630 * [`Ipv6Addr::is_loopback`]
3631 * [`Ipv6Addr::is_multicast`]
3634 * [`Vec::as_mut_slice`]
3636 * [`String::as_str`]
3637 * [`String::as_mut_str`]
3639 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3641 * `<[T]>::`[`sort_by_key`]
3642 * checked, saturated, and overflowing operations
3643 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3644 * [`i32::saturating_mul`]
3645 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3646 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3647 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3648 * [`u32::saturating_mul`]
3649 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3650 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3651 * and checked, saturated, and overflowing operations for other primitive types
3653 * [`ffi::IntoStringError`]
3654 * [`CString::into_string`]
3655 * [`CString::into_bytes`]
3656 * [`CString::into_bytes_with_nul`]
3657 * `From<CString> for Vec<u8>`
3659 * [`IntoStringError::into_cstring`]
3660 * [`IntoStringError::utf8_error`]
3661 * `Error for IntoStringError`
3663 * [`std::hash::BuildHasher`]
3664 * [`BuildHasher::Hasher`]
3665 * [`BuildHasher::build_hasher`]
3666 * [`std::hash::BuildHasherDefault`]
3667 * [`HashMap::with_hasher`]
3668 * [`HashMap::with_capacity_and_hasher`]
3669 * [`HashSet::with_hasher`]
3670 * [`HashSet::with_capacity_and_hasher`]
3671 * [`std::collections::hash_map::RandomState`]
3672 * [`RandomState::new`]
3673 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3674 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3675 from bytes is faster.
3676 * [The performance of `LineWriter` (and thus `io::stdout`) was
3677 improved by using `memchr` to search for newlines][1.7m].
3678 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3679 `f64` variants were stabilized previously.
3680 * [`BTreeMap` was rewritten to use less memory and improve the performance
3681 of insertion and iteration, the latter by as much as 5x][1.7bm].
3682 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3683 covariant over their contained type][1.7bt].
3684 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3685 over their contained type][1.7ll].
3686 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3688 * [`Any` is implemented for unsized types][1.7a].
3689 * [`Hash` is implemented for `Duration`][1.7h].
3694 * [When running tests with `--test`, rustdoc will pass `--cfg`
3695 arguments to the compiler][1.7dt].
3696 * [The compiler is built with RPATH information by default][1.7rpa].
3697 This means that it will be possible to run `rustc` when installed in
3698 unusual configurations without configuring the dynamic linker search
3700 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3701 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3702 over `LD_LIBRARY_PATH`.
3707 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3708 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3709 * [The `rerun-if-changed` build script directive no longer causes the
3710 build script to incorrectly run twice in certain scenarios][1.7rr].
3715 * Soundness fixes to the interactions between associated types and
3716 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3717 code that violates the new rules. This is a significant change that
3718 is known to break existing code, so it has emitted warnings for the
3719 new error cases since 1.4 to give crate authors time to adapt. The
3720 details of what is changing are subtle; read the RFC for more.
3721 * [Several bugs in the compiler's visibility calculations were
3722 fixed][1.7v]. Since this was found to break significant amounts of
3723 code, the new errors will be emitted as warnings for several release
3724 cycles, under the `private_in_public` lint.
3725 * Defaulted type parameters were accidentally accepted in positions
3726 that were not intended. In this release, [defaulted type parameters
3727 appearing outside of type definitions will generate a
3728 warning][1.7d], which will become an error in future releases.
3729 * [Parsing "." as a float results in an error instead of 0][1.7p].
3730 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3731 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3733 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3734 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3735 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3736 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3737 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3738 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3739 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3740 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3741 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3742 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3743 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3744 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3745 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3746 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3747 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3748 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3749 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3750 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3751 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3752 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3753 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3754 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3755 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3756 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3757 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3758 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3759 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3760 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3761 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3762 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3763 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3764 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3765 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3766 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3767 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3768 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3769 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3770 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3771 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3772 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3773 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3774 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3775 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3776 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3777 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3778 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3779 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3780 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3781 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3782 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3783 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3784 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3785 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3786 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3787 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3788 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3789 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3790 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3791 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3792 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3793 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3794 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3795 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3796 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3797 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3798 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3799 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3800 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3801 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3802 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3803 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3804 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3805 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3806 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3807 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3808 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3809 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3810 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3811 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3814 Version 1.6.0 (2016-01-21)
3815 ==========================
3820 * The `#![no_std]` attribute causes a crate to not be linked to the
3821 standard library, but only the [core library][1.6co], as described
3822 in [RFC 1184]. The core library defines common types and traits but
3823 has no platform dependencies whatsoever, and is the basis for Rust
3824 software in environments that cannot support a full port of the
3825 standard library, such as operating systems. Most of the core
3826 library is now stable.
3832 [`Read::read_exact`],
3833 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
3834 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
3835 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
3836 [`os::unix::fs::DirBuilderExt`],
3837 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
3838 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
3839 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
3840 [`collections::hash_map::Drain`],
3841 [`collections::hash_map::HashMap::drain`],
3842 [`collections::hash_set::Drain`],
3843 [`collections::hash_set::HashSet::drain`],
3844 [`collections::binary_heap::Drain`],
3845 [`collections::binary_heap::BinaryHeap::drain`],
3846 [`Vec::extend_from_slice`][] (renamed from `push_all`),
3847 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
3848 [`RwLock::into_inner`],
3849 [`Iterator::min_by_key`][] (renamed from `min_by`),
3850 [`Iterator::max_by_key`][] (renamed from `max_by`).
3851 * The [core library][1.6co] is stable, as are most of its APIs.
3852 * [The `assert_eq!` macro supports arguments that don't implement
3853 `Sized`][1.6ae], such as arrays. In this way it behaves more like
3855 * Several timer functions that take duration in milliseconds [are
3856 deprecated in favor of those that take `Duration`][1.6ms]. These
3857 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
3858 `thread::park_timeout_ms`.
3859 * The algorithm by which `Vec` reserves additional elements was
3860 [tweaked to not allocate excessive space][1.6a] while still growing
3862 * `From` conversions are [implemented from integers to floats][1.6f]
3863 in cases where the conversion is lossless. Thus they are not
3864 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
3865 or `f64`. They are also not implemented for `isize` and `usize`
3866 because the implementations would be platform-specific. `From` is
3867 also implemented from `f32` to `f64`.
3868 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
3869 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
3870 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
3871 * [`BinaryHeap` was refactored][1.6bh] for modest performance
3873 * Sorting slices that are already sorted [is 50% faster in some
3879 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
3880 * Cargo build scripts can specify their dependencies by emitting the
3881 [`rerun-if-changed`][1.6rr] key.
3882 * crates.io will reject publication of crates with dependencies that
3883 have a wildcard version constraint. Crates with wildcard
3884 dependencies were seen to cause a variety of problems, as described
3885 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
3887 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
3888 release folder. A variety of artifacts that Cargo failed to clean
3889 are now correctly deleted.
3894 * The `unreachable_code` lint [warns when a function call's argument
3896 * The parser indicates [failures that may be caused by
3897 confusingly-similar Unicode characters][1.6uc]
3898 * Certain macro errors [are reported at definition time][1.6m], not
3904 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
3905 environment variable when locating crates. This was a pre-cargo
3906 feature for integrating with the package manager that was
3907 accidentally never removed.
3908 * [A number of bugs were fixed in the privacy checker][1.6p] that
3909 could cause previously-accepted code to break.
3910 * [Modules and unit/tuple structs may not share the same name][1.6ts].
3911 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
3912 struct pattern syntax (`Foo(..)`) can no longer be used to match
3913 unit structs. This is a warning now, but will become an error in
3914 future releases. Patterns that share the same name as a const are
3916 * A bug was fixed that causes [rustc not to apply default type
3917 parameters][1.6xc] when resolving certain method implementations of
3918 traits defined in other crates.
3920 [1.6a]: https://github.com/rust-lang/rust/pull/29454
3921 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
3922 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
3923 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
3924 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
3925 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
3926 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
3927 [1.6f]: https://github.com/rust-lang/rust/pull/29129
3928 [1.6m]: https://github.com/rust-lang/rust/pull/29828
3929 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
3930 [1.6p]: https://github.com/rust-lang/rust/pull/29726
3931 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
3932 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
3933 [1.6s]: https://github.com/rust-lang/rust/pull/29675
3934 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
3935 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
3936 [1.6us]: https://github.com/rust-lang/rust/pull/29383
3937 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
3938 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
3939 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3940 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
3941 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
3942 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
3943 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
3944 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
3945 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
3946 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
3947 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
3948 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
3949 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
3950 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
3951 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
3952 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
3953 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
3954 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
3955 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
3956 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
3957 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
3958 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
3959 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
3960 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
3961 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
3962 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
3963 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
3964 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
3965 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
3966 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
3969 Version 1.5.0 (2015-12-10)
3970 ==========================
3972 * ~700 changes, numerous bugfixes
3978 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
3979 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
3980 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
3981 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
3982 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
3983 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
3984 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
3985 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
3986 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
3987 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
3988 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
3989 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
3990 [`Path::read_link`], [`Path::symlink_metadata`],
3991 [`Utf8Error::valid_up_to`], [`Vec::resize`],
3992 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
3993 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
3994 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
3995 [`slice::split_first_mut`], [`slice::split_first`],
3996 [`slice::split_last_mut`], [`slice::split_last`],
3997 [`char::from_u32_unchecked`], [`fs::canonicalize`],
3998 [`str::MatchIndices`], [`str::RMatchIndices`],
3999 [`str::match_indices`], [`str::rmatch_indices`],
4000 [`str::slice_mut_unchecked`], [`string::ParseError`].
4001 * Rust applications hosted on crates.io can be installed locally to
4002 `~/.cargo/bin` with the [`cargo install`] command. Among other
4003 things this makes it easier to augment Cargo with new subcommands:
4004 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4005 invoked as `cargo foo`.
4006 * Crates with wildcard (`*`) dependencies will [emit warnings when
4007 published][1.5w]. In 1.6 it will no longer be possible to publish
4008 crates with wildcard dependencies.
4013 * The rules determining when a particular lifetime must outlive
4014 a particular value (known as '[dropck]') have been [modified
4015 to not rely on parametricity][1.5p].
4016 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4017 and `Arc`][1.5a]. Because these smart pointer types implement
4018 `Deref`, this causes breakage in cases where the interior type
4019 contains methods of the same name.
4020 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4021 that they could drop their content. Soundness fix.
4022 * All method invocations are [properly checked][1.5wf1] for
4023 [well-formedness][1.5wf2]. Soundness fix.
4024 * Traits whose supertraits contain `Self` are [not object
4025 safe][1.5o]. Soundness fix.
4026 * Target specifications support a [`no_default_libraries`][1.5nd]
4027 setting that controls whether `-nodefaultlibs` is passed to the
4028 linker, and in turn the `is_like_windows` setting no longer affects
4029 the `-nodefaultlibs` flag.
4030 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4031 * The `#[inline]` and `#[repr]` attributes [can only appear
4032 in valid locations][1.5at].
4033 * Native libraries linked from the local crate are [passed to
4034 the linker before native libraries from upstream crates][1.5nl].
4035 * Two rarely-used attributes, `#[no_debug]` and
4036 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4037 * Negation of unsigned integers, which has been a warning for
4038 several releases, [is now behind a feature gate and will
4039 generate errors][1.5nu].
4040 * The parser accidentally accepted visibility modifiers on
4041 enum variants, a bug [which has been fixed][1.5ev].
4042 * [A bug was fixed that allowed `use` statements to import unstable
4048 * When evaluating expressions at compile-time that are not
4049 compile-time constants (const-evaluating expressions in non-const
4050 contexts), incorrect code such as overlong bitshifts and arithmetic
4051 overflow will [generate a warning instead of an error][1.5ce],
4052 delaying the error until runtime. This will allow the
4053 const-evaluator to be expanded in the future backwards-compatibly.
4054 * The `improper_ctypes` lint [no longer warns about using `isize` and
4055 `usize` in FFI][1.5ict].
4060 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4062 * `Default` is [implemented for mutable slices][1.5d].
4063 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4064 * There are now `From` conversions [between floating point
4065 types][1.5f] where the conversions are lossless.
4066 * There are now `From` conversions [between integer types][1.5i] where
4067 the conversions are lossless.
4068 * [`fs::Metadata` implements `Clone`][1.5fs].
4069 * The `parse` method [accepts a leading "+" when parsing
4071 * [`AsMut` is implemented for `Vec`][1.5am].
4072 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4073 been optimized][1.5cf] and no longer rely on the default impl.
4074 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4075 `unsafe extern "C"` function types now [implement `Clone`,
4076 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4077 `fmt::Debug` for up to 12 arguments][1.5fp].
4078 * [Dropping `Vec`s is much faster in unoptimized builds when the
4079 element types don't implement `Drop`][1.5dv].
4080 * A bug that caused in incorrect behavior when [combining `VecDeque`
4081 with zero-sized types][1.5vdz] was resolved.
4082 * [`PartialOrd` for slices is faster][1.5po].
4087 * [Crate metadata size was reduced by 20%][1.5md].
4088 * [Improvements to code generation reduced the size of libcore by 3.3
4089 MB and rustc's memory usage by 18MB][1.5m].
4090 * [Improvements to deref translation increased performance in
4091 unoptimized builds][1.5dr].
4092 * Various errors in trait resolution [are deduplicated to only be
4093 reported once][1.5te].
4094 * Rust has preliminary [support for rumprun kernels][1.5rr].
4095 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4097 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4098 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4099 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4100 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4101 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4102 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4103 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4104 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4105 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4106 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4107 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4108 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4109 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4110 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4111 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4112 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4113 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4114 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4115 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4116 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4117 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4118 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4119 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4120 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4121 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4122 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4123 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4124 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4125 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4126 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4127 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4128 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4129 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4130 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4131 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4132 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4133 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4134 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4135 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4136 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4137 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4138 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4139 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4140 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4141 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4142 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4143 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4144 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4145 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4146 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4147 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4148 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4149 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4150 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4151 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4152 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4153 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4154 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4155 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4156 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4157 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4158 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4159 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4160 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4161 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4162 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4163 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4164 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4165 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4166 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4167 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4168 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4169 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4170 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4171 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4172 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4173 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4174 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4175 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4176 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4177 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4178 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4179 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4180 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4181 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4182 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4183 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4184 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4185 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4187 Version 1.4.0 (2015-10-29)
4188 ==========================
4190 * ~1200 changes, numerous bugfixes
4195 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4196 GNU) are now supported and recommended for use.
4201 * [Several changes have been made to fix type soundness and improve
4202 the behavior of associated types][sound]. See [RFC 1214]. Although
4203 we have mostly introduced these changes as warnings this release, to
4204 become errors next release, there are still some scenarios that will
4205 see immediate breakage.
4206 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4207 line breaks in addition to `\n`][crlf].
4208 * [Loans of `'static` lifetime extend to the end of a function][stat].
4209 * [`str::parse` no longer introduces avoidable rounding error when
4210 parsing floating point numbers. Together with earlier changes to
4211 float formatting/output, "round trips" like f.to_string().parse()
4212 now preserve the value of f exactly. Additionally, leading plus
4213 signs are now accepted][fp3].
4219 * `use` statements that import multiple items [can now rename
4220 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4221 * [Binops work correctly on fat pointers][binfat].
4222 * `pub extern crate`, which does not behave as expected, [issues a
4223 warning][pec] until a better solution is found.
4228 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4229 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4230 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4231 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4232 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4233 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4234 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4235 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4236 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4237 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4238 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4239 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4240 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4241 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4242 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4243 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4244 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4245 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4247 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4248 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4249 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4250 `f64::from_str_radix`.
4251 * [Reverse-searching strings is faster with the 'two-way'
4253 * [`std::io::copy` allows `?Sized` arguments][cc].
4254 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4255 [override `count`, `nth` and `last` with an O(1)
4256 implementation][it].
4257 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4258 * [`IntoRawFd` has been added to the Unix-specific prelude,
4259 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4261 * [`Extend<String>` and `FromIterator<String` are both implemented for
4263 * [`IntoIterator` is implemented for references to `Option` and
4265 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4266 Copy`][ext] as part of [RFC 839]. This will cause type inference
4267 breakage in rare situations.
4268 * [`BinaryHeap` implements `Debug`][bh2].
4269 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4271 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4272 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4273 * [String comparison is faster][faststr].
4274 * `&mut T` where `T: std::fmt::Write` [also implements
4275 `std::fmt::Write`][mutw].
4276 * [A stable regression in `VecDeque::push_back` and other
4277 capacity-altering methods that caused panics for zero-sized types
4279 * [Function pointers implement traits for up to 12 parameters][fp2].
4284 * The compiler [no longer uses the 'morestack' feature to prevent
4285 stack overflow][mm]. Instead it uses guard pages and stack
4286 probes (though stack probes are not yet implemented on any platform
4288 * [The compiler matches traits faster when projections are involved][p].
4289 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4291 * [Cargo now displays useful information about what its doing during
4292 `cargo update`][cu].
4294 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4295 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4296 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4297 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4298 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4299 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4300 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4301 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4302 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4303 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4304 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4305 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4306 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4307 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4308 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4309 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4310 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4311 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4312 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4313 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4314 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4315 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4316 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4317 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4318 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4319 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4320 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4321 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4322 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4323 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4324 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4325 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4326 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4327 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4328 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4329 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4330 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4331 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4332 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4333 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4334 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4335 [bh2]: https://github.com/rust-lang/rust/pull/28156
4336 [binfat]: https://github.com/rust-lang/rust/pull/28270
4337 [bm]: https://github.com/rust-lang/rust/pull/28197
4338 [cc]: https://github.com/rust-lang/rust/pull/27531
4339 [crlf]: https://github.com/rust-lang/rust/pull/28034
4340 [cu]: https://github.com/rust-lang/cargo/pull/1931
4341 [d]: https://github.com/rust-lang/rust/pull/27825
4342 [dep]: https://github.com/rust-lang/rust/pull/28339
4343 [es]: https://github.com/rust-lang/rust/pull/27956
4344 [ext]: https://github.com/rust-lang/rust/pull/28094
4345 [faststr]: https://github.com/rust-lang/rust/pull/28338
4346 [ffi]: https://github.com/rust-lang/rust/pull/28779
4347 [fp]: https://github.com/rust-lang/rust/pull/28268
4348 [fp2]: https://github.com/rust-lang/rust/pull/28560
4349 [fp3]: https://github.com/rust-lang/rust/pull/27307
4350 [i]: https://github.com/rust-lang/rust/pull/27451
4351 [into2]: https://github.com/rust-lang/rust/pull/28039
4352 [it]: https://github.com/rust-lang/rust/pull/27652
4353 [mm]: https://github.com/rust-lang/rust/pull/27338
4354 [mutw]: https://github.com/rust-lang/rust/pull/28368
4355 [sound]: https://github.com/rust-lang/rust/pull/27641
4356 [p]: https://github.com/rust-lang/rust/pull/27866
4357 [pec]: https://github.com/rust-lang/rust/pull/28486
4358 [pr]: https://github.com/rust-lang/rust/pull/27896
4359 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4360 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4361 [s]: https://github.com/rust-lang/rust/pull/27474
4362 [stab]: https://github.com/rust-lang/rust/pull/28339
4363 [stat]: https://github.com/rust-lang/rust/pull/28321
4364 [vd]: https://github.com/rust-lang/rust/pull/28494
4366 Version 1.3.0 (2015-09-17)
4367 ==============================
4369 * ~900 changes, numerous bugfixes
4374 * The [new object lifetime defaults][nold] have been [turned
4375 on][nold2] after a cycle of warnings about the change. Now types
4376 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4377 being interpreted as `&'a Box<Trait+'a>` to `&'a
4378 Box<Trait+'static>`.
4379 * [The Rustonomicon][nom] is a new book in the official documentation
4380 that dives into writing unsafe Rust.
4381 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4382 timekeeping is employed by other std APIs, as well as out-of-tree
4388 * The [new object lifetime defaults][nold] have been [turned
4389 on][nold2] after a cycle of warnings about the change.
4390 * There is a known [regression][lr] in how object lifetime elision is
4391 interpreted, the proper solution for which is undetermined.
4392 * The `#[prelude_import]` attribute, an internal implementation
4393 detail, was accidentally stabilized previously. [It has been put
4394 behind the `prelude_import` feature gate][pi]. This change is
4395 believed to break no existing code.
4396 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4397 [more sane for dynamically sized types][dst3]. Code that relied on
4398 the previous behavior is thought to be broken.
4399 * The `dropck` rules, which checks that destructors can't access
4400 destroyed values, [have been updated][dropck] to match the
4401 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4402 cause some previously-compiling code to no longer build.
4407 * The [new object lifetime defaults][nold] have been [turned
4408 on][nold2] after a cycle of warnings about the change.
4409 * Semicolons may [now follow types and paths in
4410 macros](https://github.com/rust-lang/rust/pull/27000).
4411 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4412 [more sane for dynamically sized types][dst3]. Code that relied on
4413 the previous behavior is not known to exist, and suspected to be
4415 * `'static` variables [may now be recursive][st].
4416 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4417 implementations correctly.
4418 * The `dropck` rules, which checks that destructors can't access
4419 destroyed values, [have been updated][dropck] to match the
4425 * The [`Duration`] API, [has been stabilized][ds], as well as the
4426 `std::time` module, which presently contains only `Duration`.
4427 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4428 * The owned C string, [`CString`], implements [`Borrow`] and the
4429 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4430 these allow C strings to be borrowed and cloned in generic code.
4431 * [`CStr`] implements [`Debug`].
4432 * [`AtomicPtr`] implements [`Debug`].
4433 * [`Error`] trait objects [can be downcast to their concrete types][e]
4434 in many common configurations, using the [`is`], [`downcast`],
4435 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4437 * Searching for substrings now [employs the two-way algorithm][search]
4438 instead of doing a naive search. This gives major speedups to a
4439 number of methods, including [`contains`][sc], [`find`][sf],
4440 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4441 [`ends_with`][sew] are also faster.
4442 * The performance of `PartialEq` for slices is [much faster][ps].
4443 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4444 is overridden and optimized by the implementations for scalars.
4445 * The [`Hasher`] trait now has a number of specialized `write_*`
4446 methods for primitive types, for efficiency.
4447 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4448 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4449 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4450 of [`std::error::Error::cause`][iec] also delegates to the inner
4452 * [`process::Child`][pc] gained the [`id`] method, which returns a
4453 `u32` representing the platform-specific process identifier.
4454 * The [`connect`] method on slices is deprecated, replaced by the new
4455 [`join`] method (note that both of these are on the *unstable*
4456 [`SliceConcatExt`] trait, but through the magic of the prelude are
4457 available to stable code anyway).
4458 * The [`Div`] operator is implemented for [`Wrapping`] types.
4459 * [`DerefMut` is implemented for `String`][dms].
4460 * Performance of SipHash (the default hasher for `HashMap`) is
4461 [better for long data][sh].
4462 * [`AtomicPtr`] implements [`Send`].
4463 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4464 are now [specialized to use uninitialized buffers for increased
4466 * Lifetime parameters of foreign functions [are now resolved
4472 * Rust can now, with some coercion, [produce programs that run on
4473 Windows XP][xp], though XP is not considered a supported platform.
4474 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4475 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4476 recommended for use in 1.3, though should be fully-functional
4477 in the [64-bit 1.4 beta][b14].
4478 * On Fedora-based systems installation will [properly configure the
4479 dynamic linker][fl].
4480 * The compiler gained many new extended error descriptions, which can
4481 be accessed with the `--explain` flag.
4482 * The `dropck` pass, which checks that destructors can't access
4483 destroyed values, [has been rewritten][dropck]. This fixes some
4484 soundness holes, and as such will cause some previously-compiling
4485 code to no longer build.
4486 * `rustc` now uses [LLVM to write archive files where possible][ar].
4487 Eventually this will eliminate the compiler's dependency on the ar
4489 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4490 supported FreeBSD on x86_64).
4491 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4492 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4494 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4495 will kill the process instead of leaking][nlp].
4497 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4498 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4499 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4500 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4501 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4502 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4503 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4504 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4505 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4506 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4507 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4508 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4509 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4510 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4511 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4512 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4513 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4514 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4515 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4516 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4517 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4518 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4519 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4520 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4521 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4522 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4523 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4524 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4525 [ar]: https://github.com/rust-lang/rust/pull/26926
4526 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4527 [dms]: https://github.com/rust-lang/rust/pull/26241
4528 [dropck]: https://github.com/rust-lang/rust/pull/27261
4529 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4530 [ds]: https://github.com/rust-lang/rust/pull/26818
4531 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4532 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4533 [dst3]: https://github.com/rust-lang/rust/pull/27351
4534 [e]: https://github.com/rust-lang/rust/pull/24793
4535 [f]: https://github.com/rust-lang/rust/pull/26588
4536 [fb]: https://github.com/rust-lang/rust/pull/26959
4537 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4538 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4539 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4540 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4541 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4542 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4543 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4544 [lic]: https://github.com/rust-lang/rust/pull/26583
4545 [lnu]: https://github.com/rust-lang/rust/pull/27026
4546 [lr]: https://github.com/rust-lang/rust/issues/27248
4547 [lum]: https://github.com/rust-lang/rust/pull/26378
4548 [lur]: https://github.com/rust-lang/rust/pull/26783
4549 [nlp]: https://github.com/rust-lang/rust/pull/27176
4550 [nold2]: https://github.com/rust-lang/rust/pull/27045
4551 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4552 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4553 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4554 [pi]: https://github.com/rust-lang/rust/pull/26699
4555 [ps]: https://github.com/rust-lang/rust/pull/26884
4556 [rte]: https://github.com/rust-lang/rust/pull/26950
4557 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4558 [search]: https://github.com/rust-lang/rust/pull/26327
4559 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4560 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4561 [sh]: https://github.com/rust-lang/rust/pull/27280
4562 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4563 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4564 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4565 [st]: https://github.com/rust-lang/rust/pull/26630
4566 [win1]: https://github.com/rust-lang/rust/pull/26569
4567 [win2]: https://github.com/rust-lang/rust/pull/26741
4568 [win3]: https://github.com/rust-lang/rust/pull/26741
4569 [win4]: https://github.com/rust-lang/rust/pull/27210
4570 [xp]: https://github.com/rust-lang/rust/pull/26569
4572 Version 1.2.0 (2015-08-07)
4573 ==========================
4575 * ~1200 changes, numerous bugfixes
4580 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4581 like `Rc` to contain types without a fixed size, arrays and trait
4582 objects, finally enabling use of `Rc<[T]>` and completing the
4583 implementation of DST.
4584 * [Parallel codegen][parcodegen] is now working again, which can
4585 substantially speed up large builds in debug mode; It also gets
4586 another ~33% speedup when bootstrapping on a 4 core machine (using 8
4587 jobs). It's not enabled by default, but will be "in the near
4588 future". It can be activated with the `-C codegen-units=N` flag to
4590 * This is the first release with [experimental support for linking
4591 with the MSVC linker and lib C on Windows (instead of using the GNU
4592 variants via MinGW)][win]. It is yet recommended only for the most
4593 intrepid Rustaceans.
4594 * Benchmark compilations are showing a 30% improvement in
4595 bootstrapping over 1.1.
4600 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
4601 unicode case mapping, which is a previously-planned change in
4602 behavior and considered a bugfix.
4603 * [`mem::align_of`] now specifies [the *minimum alignment* for
4604 T][align], which is usually the alignment programs are interested
4605 in, and the same value reported by clang's
4606 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
4608 * [The `#[packed]` attribute is no longer silently accepted by the
4609 compiler][packed]. This attribute did nothing and code that
4610 mentioned it likely did not work as intended.
4611 * Associated type defaults are [now behind the
4612 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
4613 defaults *did not work*, but could be mentioned syntactically. As
4614 such this breakage has minimal impact.
4619 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4620 matching against dereferencable values.
4625 * The [`Extend`] trait, which grows a collection from an iterator, is
4626 implemented over iterators of references, for `String`, `Vec`,
4627 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4628 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4629 * The [`iter::once`] function returns an iterator that yields a single
4630 element, and [`iter::empty`] returns an iterator that yields no
4632 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4633 over substring matches.
4634 * [`Cell`] and [`RefCell`] both implement `Eq`.
4635 * A number of methods for wrapping arithmetic are added to the
4636 integral types, [`wrapping_div`], [`wrapping_rem`],
4637 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4638 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4639 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4640 type.. It is illegal for the default arithmetic operations in Rust
4641 to overflow; the desire to wrap must be explicit.
4642 * The `{:#?}` formatting specifier [displays the alternate,
4643 pretty-printed][debugfmt] form of the `Debug` formatter. This
4644 feature was actually introduced prior to 1.0 with little
4646 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4647 for writing data to formatted strings, similar to [`io::Write`].
4648 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4649 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4650 are used by code generators to emit implementations of [`Debug`].
4651 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4652 methods that convert case, following Unicode case mapping.
4653 * It is now easier to handle poisoned locks. The [`PoisonError`]
4654 type, returned by failing lock operations, exposes `into_inner`,
4655 `get_ref`, and `get_mut`, which all give access to the inner lock
4656 guard, and allow the poisoned lock to continue to operate. The
4657 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4658 poisoned lock without attempting to take the lock.
4659 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4660 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4661 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4662 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4664 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4670 * `rustc` employs smarter heuristics for guessing at [typos].
4671 * `rustc` emits more efficient code for [no-op conversions between
4672 unsafe pointers][nop].
4673 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4674 resulting in faster compile times and smaller code.
4676 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4677 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4678 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4679 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4680 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4681 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4682 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4683 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4684 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4685 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4686 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4687 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4688 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4689 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4690 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4691 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4692 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4693 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4694 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4695 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4696 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4697 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4698 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4699 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4700 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4701 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4702 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4703 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4704 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4705 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4706 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4707 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4708 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4709 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4710 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4711 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4712 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4713 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4714 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4715 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4716 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4717 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4718 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4719 [align]: https://github.com/rust-lang/rust/pull/25646
4720 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4721 [typos]: https://github.com/rust-lang/rust/pull/26087
4722 [nop]: https://github.com/rust-lang/rust/pull/26336
4723 [fat]: https://github.com/rust-lang/rust/pull/26411
4724 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4725 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4726 [packed]: https://github.com/rust-lang/rust/pull/25541
4727 [ad]: https://github.com/rust-lang/rust/pull/27382
4728 [win]: https://github.com/rust-lang/rust/pull/25350
4730 Version 1.1.0 (2015-06-25)
4731 =========================
4733 * ~850 changes, numerous bugfixes
4738 * The [`std::fs` module has been expanded][fs] to expand the set of
4739 functionality exposed:
4740 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4741 don't incur a syscall on some platforms.
4742 * A `symlink_metadata` function has been added.
4743 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4744 access to all underlying information.
4745 * The compiler now contains extended explanations of many errors. When an error
4746 with an explanation occurs the compiler suggests using the `--explain` flag
4747 to read the explanation. Error explanations are also [available online][err-index].
4748 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4749 well as other work, the time to bootstrap the compiler decreased by
4755 * The [`str::split_whitespace`] method splits a string on unicode
4756 whitespace boundaries.
4757 * On both Windows and Unix, new extension traits provide conversion of
4758 I/O types to and from the underlying system handles. On Unix, these
4759 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4760 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4761 `TcpListener`, and `UpdSocket`. Further implementations for
4762 `std::process` will be stabilized later.
4763 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4764 Windows, symlinks can be created with
4765 `std::os::windows::symlink_dir` and
4766 `std::os::windows::symlink_file`.
4767 * The `mpsc::Receiver` type can now be converted into an iterator with
4768 `into_iter` on the [`IntoIterator`] trait.
4769 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4770 implementation of the [`From`] trait.
4771 * The `Debug` implementation for `RangeFull` [creates output that is
4772 more consistent with other implementations][rf].
4773 * [`Debug` is implemented for `File`][file].
4774 * The `Default` implementation for `Arc` [no longer requires `Sync +
4776 * [The `Iterator` methods `count`, `nth`, and `last` have been
4777 overridden for slices to have O(1) performance instead of O(n)][si].
4778 * Incorrect handling of paths on Windows has been improved in both the
4779 compiler and the standard library.
4780 * [`AtomicPtr` gained a `Default` implementation][ap].
4781 * In accordance with Rust's policy on arithmetic overflow `abs` now
4782 [panics on overflow when debug assertions are enabled][abs].
4783 * The [`Cloned`] iterator, which was accidentally left unstable for
4784 1.0 [has been stabilized][c].
4785 * The [`Incoming`] iterator, which iterates over incoming TCP
4786 connections, and which was accidentally unnamable in 1.0, [is now
4787 properly exported][inc].
4788 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4789 `sift_up` or `sift_down` panic][bh].
4790 * The [`split_off`] method of `LinkedList` [no longer corrupts
4791 the list in certain scenarios][ll].
4796 * Type checking performance [has improved notably][sk] with
4797 [multiple improvements][pre].
4798 * The compiler [suggests code changes][ch] for more errors.
4799 * rustc and it's build system have experimental support for [building
4800 toolchains against MUSL][m] instead of glibc on Linux.
4801 * The compiler defines the `target_env` cfg value, which is used for
4802 distinguishing toolchains that are otherwise for the same
4803 platform. Presently this is set to `gnu` for common GNU Linux
4804 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4805 * The [`cargo rustc`][crc] command invokes a build with custom flags
4807 * [Android executables are always position independent][pie].
4808 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4811 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4812 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4813 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4814 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4815 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4816 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4817 [rf]: https://github.com/rust-lang/rust/pull/24491
4818 [err-index]: https://doc.rust-lang.org/error-index.html
4819 [sk]: https://github.com/rust-lang/rust/pull/24615
4820 [pre]: https://github.com/rust-lang/rust/pull/25323
4821 [file]: https://github.com/rust-lang/rust/pull/24598
4822 [ch]: https://github.com/rust-lang/rust/pull/24683
4823 [arc]: https://github.com/rust-lang/rust/pull/24695
4824 [si]: https://github.com/rust-lang/rust/pull/24701
4825 [ap]: https://github.com/rust-lang/rust/pull/24834
4826 [m]: https://github.com/rust-lang/rust/pull/24777
4827 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
4828 [crc]: https://github.com/rust-lang/cargo/pull/1568
4829 [pie]: https://github.com/rust-lang/rust/pull/24953
4830 [abs]: https://github.com/rust-lang/rust/pull/25441
4831 [c]: https://github.com/rust-lang/rust/pull/25496
4832 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
4833 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
4834 [inc]: https://github.com/rust-lang/rust/pull/25522
4835 [bh]: https://github.com/rust-lang/rust/pull/25856
4836 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
4837 [ll]: https://github.com/rust-lang/rust/pull/26022
4838 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
4839 [drop]: https://github.com/rust-lang/rust/pull/24935
4841 Version 1.0.0 (2015-05-15)
4842 ========================
4844 * ~1500 changes, numerous bugfixes
4849 * The vast majority of the standard library is now `#[stable]`. It is
4850 no longer possible to use unstable features with a stable build of
4852 * Many popular crates on [crates.io] now work on the stable release
4854 * Arithmetic on basic integer types now [checks for overflow in debug
4860 * Several [restrictions have been added to trait coherence][coh] in
4861 order to make it easier for upstream authors to change traits
4862 without breaking downstream code.
4863 * Digits of binary and octal literals are [lexed more eagerly][lex] to
4864 improve error messages and macro behavior. For example, `0b1234` is
4865 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
4866 * Trait bounds [are always invariant][inv], eliminating the need for
4867 the `PhantomFn` and `MarkerTrait` lang items, which have been
4869 * ["-" is no longer a valid character in crate names][cr], the `extern crate
4870 "foo" as bar` syntax has been replaced with `extern crate foo as
4871 bar`, and Cargo now automatically translates "-" in *package* names
4872 to underscore for the crate name.
4873 * [Lifetime shadowing is an error][lt].
4874 * [`Send` no longer implies `'static`][send-rfc].
4875 * [UFCS now supports trait-less associated paths][moar-ufcs] like
4876 `MyType::default()`.
4877 * Primitive types [now have inherent methods][prim-inherent],
4878 obviating the need for extension traits like `SliceExt`.
4879 * Methods with `Self: Sized` in their `where` clause are [considered
4880 object-safe][self-sized], allowing many extension traits like
4881 `IteratorExt` to be merged into the traits they extended.
4882 * You can now [refer to associated types][assoc-where] whose
4883 corresponding trait bounds appear only in a `where` clause.
4884 * The final bits of [OIBIT landed][oibit-final], meaning that traits
4885 like `Send` and `Sync` are now library-defined.
4886 * A [Reflect trait][reflect] was introduced, which means that
4887 downcasting via the `Any` trait is effectively limited to concrete
4888 types. This helps retain the potentially-important "parametricity"
4889 property: generic code cannot behave differently for different type
4890 arguments except in minor ways.
4891 * The `unsafe_destructor` feature is now deprecated in favor of the
4892 [new `dropck`][dropck]. This change is a major reduction in unsafe
4898 * The `thread_local` module [has been renamed to `std::thread`][th].
4899 * The methods of `IteratorExt` [have been moved to the `Iterator`
4901 * Several traits that implement Rust's conventions for type
4902 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
4903 [centralized in the `std::convert` module][con].
4904 * The `FromError` trait [was removed in favor of `From`][fe].
4905 * The basic sleep function [has moved to
4906 `std::thread::sleep_ms`][slp].
4907 * The `splitn` function now takes an `n` parameter that represents the
4908 number of items yielded by the returned iterator [instead of the
4909 number of 'splits'][spl].
4910 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
4911 * [Derived implementations of `PartialOrd` now order enums according
4912 to their explicitly-assigned discriminants][po].
4913 * [Methods for searching strings are generic over `Pattern`s][pat],
4914 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
4916 * [In method resolution, object methods are resolved before inherent
4918 * [`String::from_str` has been deprecated in favor of the `From` impl,
4919 `String::from`][sf].
4920 * [`io::Error` implements `Sync`][ios].
4921 * [The `words` method on `&str` has been replaced with
4922 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
4924 * The new path and IO modules are complete and `#[stable]`. This
4925 was the major library focus for this cycle.
4926 * The path API was [revised][path-normalize] to normalize `.`,
4927 adjusting the tradeoffs in favor of the most common usage.
4928 * A large number of remaining APIs in `std` were also stabilized
4929 during this cycle; about 75% of the non-deprecated API surface
4931 * The new [string pattern API][string-pattern] landed, which makes
4932 the string slice API much more internally consistent and flexible.
4933 * A new set of [generic conversion traits][conversion] replaced
4934 many existing ad hoc traits.
4935 * Generic numeric traits were [completely removed][num-traits]. This
4936 was made possible thanks to inherent methods for primitive types,
4937 and the removal gives maximal flexibility for designing a numeric
4938 hierarchy in the future.
4939 * The `Fn` traits are now related via [inheritance][fn-inherit]
4940 and provide ergonomic [blanket implementations][fn-blanket].
4941 * The `Index` and `IndexMut` traits were changed to
4942 [take the index by value][index-value], enabling code like
4943 `hash_map["string"]` to work.
4944 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
4945 `Copy` data is known to be `Clone` as well.
4950 * Many errors now have extended explanations that can be accessed with
4951 the `--explain` flag to `rustc`.
4952 * Many new examples have been added to the standard library
4954 * rustdoc has received a number of improvements focused on completion
4956 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
4957 * Much headway was made on ecosystem-wide CI, making it possible
4958 to [compare builds for breakage][ci-compare].
4961 [crates.io]: http://crates.io
4962 [clo]: https://github.com/rust-lang/rust/pull/24034
4963 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
4964 [con]: https://github.com/rust-lang/rust/pull/23875
4965 [cr]: https://github.com/rust-lang/rust/pull/23419
4966 [fe]: https://github.com/rust-lang/rust/pull/23879
4967 [ie]: https://github.com/rust-lang/rust/pull/23300
4968 [inv]: https://github.com/rust-lang/rust/pull/23938
4969 [ios]: https://github.com/rust-lang/rust/pull/24133
4970 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
4971 [lt]: https://github.com/rust-lang/rust/pull/24057
4972 [meth]: https://github.com/rust-lang/rust/pull/24056
4973 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
4974 [po]: https://github.com/rust-lang/rust/pull/24270
4975 [sf]: https://github.com/rust-lang/rust/pull/24517
4976 [slp]: https://github.com/rust-lang/rust/pull/23949
4977 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
4978 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
4979 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
4980 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
4981 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
4982 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
4983 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
4984 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
4985 [self-sized]: https://github.com/rust-lang/rust/pull/22301
4986 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
4987 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
4988 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
4989 [reflect]: https://github.com/rust-lang/rust/pull/23712
4990 [conversion]: https://github.com/rust-lang/rfcs/pull/529
4991 [num-traits]: https://github.com/rust-lang/rust/pull/23549
4992 [index-value]: https://github.com/rust-lang/rust/pull/23601
4993 [dropck]: https://github.com/rust-lang/rfcs/pull/769
4994 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
4995 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
4996 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
4997 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
4998 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5001 Version 1.0.0-alpha.2 (2015-02-20)
5002 =====================================
5004 * ~1300 changes, numerous bugfixes
5008 * The various I/O modules were [overhauled][io-rfc] to reduce
5009 unnecessary abstractions and provide better interoperation with
5010 the underlying platform. The old `io` module remains temporarily
5012 * The standard library now [participates in feature gating][feat],
5013 so use of unstable libraries now requires a `#![feature(...)]`
5014 attribute. The impact of this change is [described on the
5015 forum][feat-forum]. [RFC][feat-rfc].
5019 * `for` loops [now operate on the `IntoIterator` trait][into],
5020 which eliminates the need to call `.iter()`, etc. to iterate
5021 over collections. There are some new subtleties to remember
5022 though regarding what sort of iterators various types yield, in
5023 particular that `for foo in bar { }` yields values from a move
5024 iterator, destroying the original collection. [RFC][into-rfc].
5025 * Objects now have [default lifetime bounds][obj], so you don't
5026 have to write `Box<Trait+'static>` when you don't care about
5027 storing references. [RFC][obj-rfc].
5028 * In types that implement `Drop`, [lifetimes must outlive the
5029 value][drop]. This will soon make it possible to safely
5030 implement `Drop` for types where `#[unsafe_destructor]` is now
5031 required. Read the [gorgeous RFC][drop-rfc] for details.
5032 * The fully qualified <T as Trait>::X syntax lets you set the Self
5033 type for a trait method or associated type. [RFC][ufcs-rfc].
5034 * References to types that implement `Deref<U>` now [automatically
5035 coerce to references][deref] to the dereferenced type `U`,
5036 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5037 should eliminate many unsightly uses of `&*`, as when converting
5038 from references to vectors into references to
5039 slices. [RFC][deref-rfc].
5040 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5041 `|:|`) is obsolete and closure kind is inferred from context.
5042 * [`Self` is a keyword][Self].
5046 * The `Show` and `String` formatting traits [have been
5047 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5048 their related purposes. Automatically getting a string
5049 conversion to use with `format!("{:?}", something_to_debug)` is
5050 now written `#[derive(Debug)]`.
5051 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5052 OsStr}`, provide strings in platform-specific encodings for easier
5053 interop with system APIs. [RFC][osstr-rfc].
5054 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5055 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5056 creating raw pointers.
5060 * Certain long error messages of the form 'expected foo found bar'
5061 are now [split neatly across multiple
5062 lines][multiline]. Examples in the PR.
5063 * On Unix Rust can be [uninstalled][un] by running
5064 `/usr/local/lib/rustlib/uninstall.sh`.
5065 * The `#[rustc_on_unimplemented]` attribute, requiring the
5066 'on_unimplemented' feature, lets rustc [display custom error
5067 messages when a trait is expected to be implemented for a type
5072 * Rust is tested against a [LALR grammar][lalr], which parses
5073 almost all the Rust files that rustc does.
5075 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5076 [close]: https://github.com/rust-lang/rust/pull/21843
5077 [deref]: https://github.com/rust-lang/rust/pull/21351
5078 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5079 [drop]: https://github.com/rust-lang/rust/pull/21972
5080 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5081 [feat]: https://github.com/rust-lang/rust/pull/21248
5082 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5083 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5084 [fmt]: https://github.com/rust-lang/rust/pull/21457
5085 [into]: https://github.com/rust-lang/rust/pull/20790
5086 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5087 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5088 [lalr]: https://github.com/rust-lang/rust/pull/21452
5089 [multiline]: https://github.com/rust-lang/rust/pull/19870
5090 [obj]: https://github.com/rust-lang/rust/pull/22230
5091 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5092 [onun]: https://github.com/rust-lang/rust/pull/20889
5093 [osstr]: https://github.com/rust-lang/rust/pull/21488
5094 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5095 [Self]: https://github.com/rust-lang/rust/pull/22158
5096 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5097 [un]: https://github.com/rust-lang/rust/pull/22256
5100 Version 1.0.0-alpha (2015-01-09)
5101 ==================================
5103 * ~2400 changes, numerous bugfixes
5107 * The language itself is considered feature complete for 1.0,
5108 though there will be many usability improvements and bugfixes
5109 before the final release.
5110 * Nearly 50% of the public API surface of the standard library has
5111 been declared 'stable'. Those interfaces are unlikely to change
5113 * The long-running debate over integer types has been
5114 [settled][ints]: Rust will ship with types named `isize` and
5115 `usize`, rather than `int` and `uint`, for pointer-sized
5116 integers. Guidelines will be rolled out during the alpha cycle.
5117 * Most crates that are not `std` have been moved out of the Rust
5118 distribution into the Cargo ecosystem so they can evolve
5119 separately and don't need to be stabilized as quickly, including
5120 'time', 'getopts', 'num', 'regex', and 'term'.
5121 * Documentation continues to be expanded with more API coverage, more
5122 examples, and more in-depth explanations. The guides have been
5123 consolidated into [The Rust Programming Language][trpl].
5124 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5125 * All official Rust binary installers now come with [Cargo], the
5126 Rust package manager.
5130 * Closures have been [completely redesigned][unboxed] to be
5131 implemented in terms of traits, can now be used as generic type
5132 bounds and thus monomorphized and inlined, or via an opaque
5133 pointer (boxed) as in the old system. The new system is often
5134 referred to as 'unboxed' closures.
5135 * Traits now support [associated types][assoc], allowing families
5136 of related types to be defined together and used generically in
5138 * Enum variants are [namespaced by their type names][enum].
5139 * [`where` clauses][where] provide a more versatile and attractive
5140 syntax for specifying generic bounds, though the previous syntax
5142 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5144 * Rust [no longer has a runtime][rt] of any description, and only
5145 supports OS threads, not green threads.
5146 * At long last, Rust has been overhauled for 'dynamically-sized
5147 types' ([DST]), which integrates 'fat pointers' (object types,
5148 arrays, and `str`) more deeply into the type system, making it
5150 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5151 `..j` that produce range types and which, when combined with the
5152 `Index` operator and multidispatch, leads to a convenient slice
5154 * The new range syntax revealed an ambiguity in the fixed-length
5155 array syntax, so now fixed length arrays [are written `[T;
5157 * The `Copy` trait is no longer implemented automatically. Unsafe
5158 pointers no longer implement `Sync` and `Send` so types
5159 containing them don't automatically either. `Sync` and `Send`
5160 are now 'unsafe traits' so one can "forcibly" implement them via
5161 `unsafe impl` if a type confirms to the requirements for them
5162 even though the internals do not (e.g. structs containing unsafe
5163 pointers like `Arc`). These changes are intended to prevent some
5164 footguns and are collectively known as [opt-in built-in
5165 traits][oibit] (though `Sync` and `Send` will soon become pure
5166 library types unknown to the compiler).
5167 * Operator traits now take their operands [by value][ops], and
5168 comparison traits can use multidispatch to compare one type
5169 against multiple other types, allowing e.g. `String` to be
5170 compared with `&str`.
5171 * `if let` and `while let` are no longer feature-gated.
5172 * Rust has adopted a more [uniform syntax for escaping unicode
5173 characters][unicode].
5174 * `macro_rules!` [has been declared stable][mac]. Though it is a
5175 flawed system it is sufficiently popular that it must be usable
5176 for 1.0. Effort has gone into [future-proofing][mac-future] it
5177 in ways that will allow other macro systems to be developed in
5178 parallel, and won't otherwise impact the evolution of the
5180 * The prelude has been [pared back significantly][prelude] such
5181 that it is the minimum necessary to support the most pervasive
5182 code patterns, and through [generalized where clauses][where]
5183 many of the prelude extension traits have been consolidated.
5184 * Rust's rudimentary reflection [has been removed][refl], as it
5185 incurred too much code generation for little benefit.
5186 * [Struct variants][structvars] are no longer feature-gated.
5187 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5188 known as 'higher-ranked trait bounds', this crucially allows
5189 unboxed closures to work.
5190 * Macros invocations surrounded by parens or square brackets and
5191 not terminated by a semicolon are [parsed as
5192 expressions][macros], which makes expressions like `vec![1i32,
5193 2, 3].len()` work as expected.
5194 * Trait objects now implement their traits automatically, and
5195 traits that can be coerced to objects now must be [object
5197 * Automatically deriving traits is now done with `#[derive(...)]`
5198 not `#[deriving(...)]` for [consistency with other naming
5199 conventions][derive].
5200 * Importing the containing module or enum at the same time as
5201 items or variants they contain is [now done with `self` instead
5202 of `mod`][self], as in use `foo::{self, bar}`
5203 * Glob imports are no longer feature-gated.
5204 * The `box` operator and `box` patterns have been feature-gated
5205 pending a redesign. For now unique boxes should be allocated
5206 like other containers, with `Box::new`.
5210 * A [series][coll1] of [efforts][coll2] to establish
5211 [conventions][coll3] for collections types has resulted in API
5212 improvements throughout the standard library.
5213 * New [APIs for error handling][err] provide ergonomic interop
5214 between error types, and [new conventions][err-conv] describe
5215 more clearly the recommended error handling strategies in Rust.
5216 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5217 it is easier to discuss failure in the context of error handling
5218 without making clarifications as to whether you are referring to
5219 the 'fail' macro or failure more generally.
5220 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5221 syscall when available.
5222 * The 'serialize' crate has been renamed 'rustc-serialize' and
5223 moved out of the distribution to Cargo. Although it is widely
5224 used now, it is expected to be superseded in the near future.
5225 * The `Show` formatter, typically implemented with
5226 `#[derive(Show)]` is [now requested with the `{:?}`
5227 specifier][show] and is intended for use by all types, for uses
5228 such as `println!` debugging. The new `String` formatter must be
5229 implemented by hand, uses the `{}` specifier, and is intended
5230 for full-fidelity conversions of things that can logically be
5231 represented as strings.
5235 * [Flexible target specification][flex] allows rustc's code
5236 generation to be configured to support otherwise-unsupported
5238 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5239 respective debuggers with Rust-appropriate pretty-printing.
5240 * The Windows installation of Rust is distributed with the
5241 MinGW components currently required to link binaries on that
5246 * Nullable enum optimizations have been extended to more types so
5247 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5248 space than the inner types themselves.
5249 * Work has begun on supporting AArch64.
5251 [Cargo]: https://crates.io
5252 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5253 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5254 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5255 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5256 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5257 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5258 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5259 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5260 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5261 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5262 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5263 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5264 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5265 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5266 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5267 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5268 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5269 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5270 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5271 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5272 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5273 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5274 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5275 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5276 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5277 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5278 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5279 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5280 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5281 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5282 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5283 [trpl]: https://doc.rust-lang.org/book/index.html
5284 [rbe]: http://rustbyexample.com/
5287 Version 0.12.0 (2014-10-09)
5288 =============================
5290 * ~1900 changes, numerous bugfixes
5294 * The introductory documentation (now called The Rust Guide) has
5295 been completely rewritten, as have a number of supplementary
5297 * Rust's package manager, Cargo, continues to improve and is
5298 sometimes considered to be quite awesome.
5299 * Many API's in `std` have been reviewed and updated for
5300 consistency with the in-development Rust coding
5301 guidelines. The standard library documentation tracks
5302 stabilization progress.
5303 * Minor libraries have been moved out-of-tree to the rust-lang org
5304 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5305 be installed with Cargo.
5306 * Lifetime elision allows lifetime annotations to be left off of
5307 function declarations in many common scenarios.
5308 * Rust now works on 64-bit Windows.
5311 * Indexing can be overloaded with the `Index` and `IndexMut`
5313 * The `if let` construct takes a branch only if the `let` pattern
5314 matches, currently behind the 'if_let' feature gate.
5315 * 'where clauses', a more flexible syntax for specifying trait
5316 bounds that is more aesthetic, have been added for traits and
5317 free functions. Where clauses will in the future make it
5318 possible to constrain associated types, which would be
5319 impossible with the existing syntax.
5320 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5321 the 'slicing_syntax' feature gate, and can be overloaded with
5322 the `Slice` or `SliceMut` traits.
5323 * The syntax for matching of sub-slices has been changed to use a
5324 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5325 consistency with other uses of `..` and to future-proof
5326 potential additional uses of the syntax.
5327 * The syntax for matching inclusive ranges in patterns has changed
5328 from `0..3` to `0...4` to be consistent with the exclusive range
5330 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5331 c]`) has been put behind the 'advanced_slice_patterns' feature
5332 gate and may be removed in the future.
5333 * Components of tuples and tuple structs can be extracted using
5334 the `value.0` syntax, currently behind the `tuple_indexing`
5336 * The `#[crate_id]` attribute is no longer supported; versioning
5337 is handled by the package manager.
5338 * Renaming crate imports are now written `extern crate foo as bar`
5339 instead of `extern crate bar = foo`.
5340 * Renaming use statements are now written `use foo as bar` instead
5342 * `let` and `match` bindings and argument names in macros are now
5344 * The new, more efficient, closure types ('unboxed closures') have
5345 been added under a feature gate, 'unboxed_closures'. These will
5346 soon replace the existing closure types, once higher-ranked
5347 trait lifetimes are added to the language.
5348 * `move` has been added as a keyword, for indicating closures
5349 that capture by value.
5350 * Mutation and assignment is no longer allowed in pattern guards.
5351 * Generic structs and enums can now have trait bounds.
5352 * The `Share` trait is now called `Sync` to free up the term
5353 'shared' to refer to 'shared reference' (the default reference
5355 * Dynamically-sized types have been mostly implemented,
5356 unifying the behavior of fat-pointer types with the rest of the
5358 * As part of dynamically-sized types, the `Sized` trait has been
5359 introduced, which qualifying types implement by default, and
5360 which type parameters expect by default. To specify that a type
5361 parameter does not need to be sized, write `<Sized? T>`. Most
5362 types are `Sized`, notable exceptions being unsized arrays
5363 (`[T]`) and trait types.
5364 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5365 * Lifetime bounds can now be applied to type parameters and object
5367 * The old, reference counted GC type, `Gc<T>` which was once
5368 denoted by the `@` sigil, has finally been removed. GC will be
5369 revisited in the future.
5372 * Library documentation has been improved for a number of modules.
5373 * Bit-vectors, collections::bitv has been modernized.
5374 * The url crate is deprecated in favor of
5375 http://github.com/servo/rust-url, which can be installed with
5377 * Most I/O stream types can be cloned and subsequently closed from
5379 * A `std::time::Duration` type has been added for use in I/O
5380 methods that rely on timers, as well as in the 'time' crate's
5381 `Timespec` arithmetic.
5382 * The runtime I/O abstraction layer that enabled the green thread
5383 scheduler to do non-thread-blocking I/O has been removed, along
5384 with the libuv-based implementation employed by the green thread
5385 scheduler. This will greatly simplify the future I/O work.
5386 * `collections::btree` has been rewritten to have a more
5387 idiomatic and efficient design.
5390 * rustdoc output now indicates the stability levels of API's.
5391 * The `--crate-name` flag can specify the name of the crate
5392 being compiled, like `#[crate_name]`.
5393 * The `-C metadata` specifies additional metadata to hash into
5394 symbol names, and `-C extra-filename` specifies additional
5395 information to put into the output filename, for use by the
5396 package manager for versioning.
5397 * debug info generation has continued to improve and should be
5398 more reliable under both gdb and lldb.
5399 * rustc has experimental support for compiling in parallel
5400 using the `-C codegen-units` flag.
5401 * rustc no longer encodes rpath information into binaries by
5405 * Stack usage has been optimized with LLVM lifetime annotations.
5406 * Official Rust binaries on Linux are more compatible with older
5407 kernels and distributions, built on CentOS 5.10.
5410 Version 0.11.0 (2014-07-02)
5411 ==========================
5413 * ~1700 changes, numerous bugfixes
5416 * ~[T] has been removed from the language. This type is superseded by
5418 * ~str has been removed from the language. This type is superseded by
5420 * ~T has been removed from the language. This type is superseded by the
5422 * @T has been removed from the language. This type is superseded by the
5423 standard library's std::gc::Gc<T> type.
5424 * Struct fields are now all private by default.
5425 * Vector indices and shift amounts are both required to be a `uint`
5426 instead of any integral type.
5427 * Byte character, byte string, and raw byte string literals are now all
5428 supported by prefixing the normal literal with a `b`.
5429 * Multiple ABIs are no longer allowed in an ABI string
5430 * The syntax for lifetimes on closures/procedures has been tweaked
5431 slightly: `<'a>|A, B|: 'b + K -> T`
5432 * Floating point modulus has been removed from the language; however it
5433 is still provided by a library implementation.
5434 * Private enum variants are now disallowed.
5435 * The `priv` keyword has been removed from the language.
5436 * A closure can no longer be invoked through a &-pointer.
5437 * The `use foo, bar, baz;` syntax has been removed from the language.
5438 * The transmute intrinsic no longer works on type parameters.
5439 * Statics now allow blocks/items in their definition.
5440 * Trait bounds are separated from objects with + instead of : now.
5441 * Objects can no longer be read while they are mutably borrowed.
5442 * The address of a static is now marked as insignificant unless the
5443 #[inline(never)] attribute is placed it.
5444 * The #[unsafe_destructor] attribute is now behind a feature gate.
5445 * Struct literals are no longer allowed in ambiguous positions such as
5446 if, while, match, and for..in.
5447 * Declaration of lang items and intrinsics are now feature-gated by
5449 * Integral literals no longer default to `int`, and floating point
5450 literals no longer default to `f64`. Literals must be suffixed with an
5451 appropriate type if inference cannot determine the type of the
5453 * The Box<T> type is no longer implicitly borrowed to &mut T.
5454 * Procedures are now required to not capture borrowed references.
5457 * The standard library is now a "facade" over a number of underlying
5458 libraries. This means that development on the standard library should
5459 be speedier due to smaller crates, as well as a clearer line between
5461 * A new library, libcore, lives under the standard library's facade
5462 which is Rust's "0-assumption" library, suitable for embedded and
5463 kernel development for example.
5464 * A regex crate has been added to the standard distribution. This crate
5465 includes statically compiled regular expressions.
5466 * The unwrap/unwrap_err methods on Result require a Show bound for
5467 better error messages.
5468 * The return types of the std::comm primitives have been centralized
5469 around the Result type.
5470 * A number of I/O primitives have gained the ability to time out their
5472 * A number of I/O primitives have gained the ability to close their
5473 reading/writing halves to cancel pending operations.
5474 * Reverse iterator methods have been removed in favor of `rev()` on
5475 their forward-iteration counterparts.
5476 * A bitflags! macro has been added to enable easy interop with C and
5477 management of bit flags.
5478 * A debug_assert! macro is now provided which is disabled when
5479 `--cfg ndebug` is passed to the compiler.
5480 * A graphviz crate has been added for creating .dot files.
5481 * The std::cast module has been migrated into std::mem.
5482 * The std::local_data api has been migrated from freestanding functions
5483 to being based on methods.
5484 * The Pod trait has been renamed to Copy.
5485 * jemalloc has been added as the default allocator for types.
5486 * The API for allocating memory has been changed to use proper alignment
5487 and sized deallocation
5488 * Connecting a TcpStream or binding a TcpListener is now based on a
5489 string address and a u16 port. This allows connecting to a hostname as
5491 * The Reader trait now contains a core method, read_at_least(), which
5492 correctly handles many repeated 0-length reads.
5493 * The process-spawning API is now centered around a builder-style
5495 * The :? printing qualifier has been moved from the standard library to
5496 an external libdebug crate.
5497 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5498 have been renamed to Eq/Ord.
5499 * The select/plural methods have been removed from format!. The escapes
5500 for { and } have also changed from \{ and \} to {{ and }},
5502 * The TaskBuilder API has been re-worked to be a true builder, and
5503 extension traits for spawning native/green tasks have been added.
5506 * All breaking changes to the language or libraries now have their
5507 commit message annotated with `[breaking-change]` to allow for easy
5508 discovery of breaking changes.
5509 * The compiler will now try to suggest how to annotate lifetimes if a
5510 lifetime-related error occurs.
5511 * Debug info continues to be improved greatly with general bug fixes and
5512 better support for situations like link time optimization (LTO).
5513 * Usage of syntax extensions when cross-compiling has been fixed.
5514 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5515 -fdata-sections and --gc-sections has been enabled by default
5516 * The compiler is now stricter about where it will load module files
5517 from when a module is declared via `mod foo;`.
5518 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5519 Syntax extensions are now discovered via a "plugin registrar" type
5520 which will be extended in the future to other various plugins.
5521 * Lints have been restructured to allow for dynamically loadable lints.
5522 * A number of rustdoc improvements:
5523 * The HTML output has been visually redesigned.
5524 * Markdown is now powered by hoedown instead of sundown.
5525 * Searching heuristics have been greatly improved.
5526 * The search index has been reduced in size by a great amount.
5527 * Cross-crate documentation via `pub use` has been greatly improved.
5528 * Primitive types are now hyperlinked and documented.
5529 * Documentation has been moved from static.rust-lang.org/doc to
5531 * A new sandbox, play.rust-lang.org, is available for running and
5532 sharing rust code examples on-line.
5533 * Unused attributes are now more robustly warned about.
5534 * The dead_code lint now warns about unused struct fields.
5535 * Cross-compiling to iOS is now supported.
5536 * Cross-compiling to mipsel is now supported.
5537 * Stability attributes are now inherited by default and no longer apply
5538 to intra-crate usage, only inter-crate usage.
5539 * Error message related to non-exhaustive match expressions have been
5543 Version 0.10 (2014-04-03)
5544 =========================
5546 * ~1500 changes, numerous bugfixes
5549 * A new RFC process is now in place for modifying the language.
5550 * Patterns with `@`-pointers have been removed from the language.
5551 * Patterns with unique vectors (`~[T]`) have been removed from the
5553 * Patterns with unique strings (`~str`) have been removed from the
5555 * `@str` has been removed from the language.
5556 * `@[T]` has been removed from the language.
5557 * `@self` has been removed from the language.
5558 * `@Trait` has been removed from the language.
5559 * Headers on `~` allocations which contain `@` boxes inside the type for
5560 reference counting have been removed.
5561 * The semantics around the lifetimes of temporary expressions have changed,
5562 see #3511 and #11585 for more information.
5563 * Cross-crate syntax extensions are now possible, but feature gated. See
5564 #11151 for more information. This includes both `macro_rules!` macros as
5565 well as syntax extensions such as `format!`.
5566 * New lint modes have been added, and older ones have been turned on to be
5568 * Unnecessary parentheses
5571 * Uppercase variables
5572 * Publicly visible private types
5573 * `#[deriving]` with raw pointers
5574 * Unsafe functions can no longer be coerced to closures.
5575 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5576 * The `#[simd]` attribute is now behind a feature gate.
5577 * Visibility is no longer allowed on `extern crate` statements, and
5578 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5579 * Trailing commas are now allowed in argument lists and tuple patterns.
5580 * The `do` keyword has been removed, it is now a reserved keyword.
5581 * Default type parameters have been implemented, but are feature gated.
5582 * Borrowed variables through captures in closures are now considered soundly.
5583 * `extern mod` is now `extern crate`
5584 * The `Freeze` trait has been removed.
5585 * The `Share` trait has been added for types that can be shared among
5587 * Labels in macros are now hygienic.
5588 * Expression/statement macro invocations can be delimited with `{}` now.
5589 * Treatment of types allowed in `static mut` locations has been tweaked.
5590 * The `*` and `.` operators are now overloadable through the `Deref` and
5592 * `~Trait` and `proc` no longer have `Send` bounds by default.
5593 * Partial type hints are now supported with the `_` type marker.
5594 * An `Unsafe` type was introduced for interior mutability. It is now
5595 considered undefined to transmute from `&T` to `&mut T` without using the
5597 * The #[linkage] attribute was implemented for extern statics/functions.
5598 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
5599 * `Pod` was renamed to `Copy`.
5602 * The `libextra` library has been removed. It has now been decomposed into
5603 component libraries with smaller and more focused nuggets of
5604 functionality. The full list of libraries can be found on the
5605 documentation index page.
5606 * std: `std::condition` has been removed. All I/O errors are now propagated
5607 through the `Result` type. In order to assist with error handling, a
5608 `try!` macro for unwrapping errors with an early return and a lint for
5609 unused results has been added. See #12039 for more information.
5610 * std: The `vec` module has been renamed to `slice`.
5611 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
5612 This will become the only growable vector in the future.
5613 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
5614 are now found at `std::io::BufferedReader` instead of
5615 `std::io::buffered::BufferedReader`.
5616 * std: `print` and `println` are no longer in the prelude, the `print!` and
5617 `println!` macros are intended to be used instead.
5618 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5619 attempts to statically prevent cycles.
5620 * std: The standard distribution is adopting the policy of pushing failure
5621 to the user rather than failing in libraries. Many functions (such as
5622 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5623 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5624 deriving mode: `#[deriving(Show)]`.
5625 * std: `ToStr` is now implemented for all types implementing `Show`.
5626 * std: The formatting trait methods now take `&self` instead of `&T`
5627 * std: The `invert()` method on iterators has been renamed to `rev()`
5628 * std: `std::num` has seen a reduction in the genericity of its traits,
5629 consolidating functionality into a few core traits.
5630 * std: Backtraces are now printed on task failure if the environment
5631 variable `RUST_BACKTRACE` is present.
5632 * std: Naming conventions for iterators have been standardized. More details
5633 can be found on the wiki's style guide.
5634 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5635 still implement the function.
5636 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5637 * std: `assert_approx_eq!` has been removed
5638 * std: The `e` and `E` formatting specifiers for floats have been added to
5639 print them in exponential notation.
5640 * std: The `Times` trait has been removed
5641 * std: Indications of variance and opting out of builtin bounds is done
5642 through marker types in `std::kinds::marker` now
5643 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5644 `#[deriving(Hash)]` is now possible.
5645 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5646 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5647 * std: `Chan::new` is now `channel()`.
5648 * std: A new synchronous channel type has been implemented.
5649 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5650 * std: `hashmap` and `trie` have been moved to `libcollections`
5651 * std: `run` has been rolled into `io::process`
5652 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5653 * std: The equality and comparison traits have seen some reorganization.
5654 * std: `rand` has moved to `librand`.
5655 * std: `to_{lower,upper}case` has been implemented for `char`.
5656 * std: Logging has been moved to `liblog`.
5657 * collections: `HashMap` has been rewritten for higher performance and less
5659 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5660 it can be booted manually. The runtime guide has more information and
5662 * native: All I/O functionality except signals has been implemented.
5663 * green: Task spawning with `libgreen` has been optimized with stack caching
5664 and various trimming of code.
5665 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5666 * sync: The `extra::sync` module has been updated to modern rust (and moved
5667 to the `sync` library), tweaking and improving various interfaces while
5668 dropping redundant functionality.
5669 * sync: A new `Barrier` type has been added to the `sync` library.
5670 * sync: An efficient mutex for native and green tasks has been implemented.
5671 * serialize: The `base64` module has seen some improvement. It treats
5672 newlines better, has non-string error values, and has seen general
5674 * fourcc: A `fourcc!` macro was introduced
5675 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5676 hexadecimal literal.
5679 * `rustpkg` has been deprecated and removed from the main repository. Its
5680 replacement, `cargo`, is under development.
5681 * Nightly builds of rust are now available
5682 * The memory usage of rustc has been improved many times throughout this
5684 * The build process supports disabling rpath support for the rustc binary
5686 * Code generation has improved in some cases, giving more information to the
5687 LLVM optimization passes to enable more extensive optimizations.
5688 * Debuginfo compatibility with lldb on OSX has been restored.
5689 * The master branch is now gated on an android bot, making building for
5690 android much more reliable.
5691 * Output flags have been centralized into one `--emit` flag.
5692 * Crate type flags have been centralized into one `--crate-type` flag.
5693 * Codegen flags have been consolidated behind a `-C` flag.
5694 * Linking against outdated crates now has improved error messages.
5695 * Error messages with lifetimes will often suggest how to annotate the
5696 function to fix the error.
5697 * Many more types are documented in the standard library, and new guides
5699 * Many `rustdoc` improvements:
5700 * code blocks are syntax highlighted.
5701 * render standalone markdown files.
5702 * the --test flag tests all code blocks by default.
5703 * exported macros are displayed.
5704 * re-exported types have their documentation inlined at the location of the
5706 * search works across crates that have been rendered to the same output
5710 Version 0.9 (2014-01-09)
5711 ==========================
5713 * ~1800 changes, numerous bugfixes
5716 * The `float` type has been removed. Use `f32` or `f64` instead.
5717 * A new facility for enabling experimental features (feature gating) has
5718 been added, using the crate-level `#[feature(foo)]` attribute.
5719 * Managed boxes (@) are now behind a feature gate
5720 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5721 standard library's `Gc` or `Rc` types instead.
5722 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5723 * Jumping back to the top of a loop is now done with `continue` instead of
5725 * Strings can no longer be mutated through index assignment.
5726 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5727 hash delimiters, as in `r###"foo"###`.
5728 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5730 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5731 * `@fn`s have been removed.
5732 * `do` only works with procs in order to make it obvious what the cost
5734 * Single-element tuple-like structs can no longer be dereferenced to
5735 obtain the inner value. A more comprehensive solution for overloading
5736 the dereference operator will be provided in the future.
5737 * The `#[link(...)]` attribute has been replaced with
5738 `#[crate_id = "name#vers"]`.
5739 * Empty `impl`s must be terminated with empty braces and may not be
5740 terminated with a semicolon.
5741 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5742 no longer has any special meaning.
5743 * The old `fmt!` string formatting macro has been removed.
5744 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5745 `print!` and `println!`.
5746 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5747 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5748 `extern mod foo = "bar"` instead.
5749 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5750 * Macros can have attributes.
5751 * Macros can expand to items with attributes.
5752 * Macros can expand to multiple items.
5753 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5754 * Comments may be nested.
5755 * Values automatically coerce to trait objects they implement, without
5757 * Enum discriminants are no longer an entire word but as small as needed to
5758 contain all the variants. The `repr` attribute can be used to override
5759 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5760 `#[repr(C)]` to match C enums.
5761 * Non-string literals are not allowed in attributes (they never worked).
5762 * The FFI now supports variadic functions.
5763 * Octal numeric literals, as in `0o7777`.
5764 * The `concat!` syntax extension performs compile-time string concatenation.
5765 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5766 removed as Rust no longer uses segmented stacks.
5767 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5768 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5769 not `*`; ignoring remaining fields of a struct is also done with `..`,
5770 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5771 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5772 * `rustc` supports the "system" calling convention, which defaults to the
5773 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5775 * The `type_overflow` lint (default: warn) checks literals for overflow.
5776 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5777 * The `attribute_usage` lint (default: warn) warns about unknown
5779 * The `unknown_features` lint (default: warn) warns about unknown
5781 * The `dead_code` lint (default: warn) checks for dead code.
5782 * Rust libraries can be linked statically to one another
5783 * `#[link_args]` is behind the `link_args` feature gate.
5784 * Native libraries are now linked with `#[link(name = "foo")]`
5785 * Native libraries can be statically linked to a rust crate
5786 (`#[link(name = "foo", kind = "static")]`).
5787 * Native OS X frameworks are now officially supported
5788 (`#[link(name = "foo", kind = "framework")]`).
5789 * The `#[thread_local]` attribute creates thread-local (not task-local)
5790 variables. Currently behind the `thread_local` feature gate.
5791 * The `return` keyword may be used in closures.
5792 * Types that can be copied via a memcpy implement the `Pod` kind.
5793 * The `cfg` attribute can now be used on struct fields and enum variants.
5796 * std: The `option` and `result` API's have been overhauled to make them
5797 simpler, more consistent, and more composable.
5798 * std: The entire `std::io` module has been replaced with one that is
5799 more comprehensive and that properly interfaces with the underlying
5800 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5802 * std: `io::util` contains a number of useful implementations of
5803 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5804 `ZeroReader`, `TeeReader`.
5805 * std: The reference counted pointer type `extra::rc` moved into std.
5806 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5807 just a wrapper around it).
5808 * std: The `Either` type has been removed.
5809 * std: `fmt::Default` can be implemented for any type to provide default
5810 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5811 * std: The `rand` API continues to be tweaked.
5812 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5813 on failure in gdb, is now named `rust_fail`.
5814 * std: The `each_key` and `each_value` methods on `HashMap` have been
5815 replaced by the `keys` and `values` iterators.
5816 * std: Functions dealing with type size and alignment have moved from the
5817 `sys` module to the `mem` module.
5818 * std: The `path` module was written and API changed.
5819 * std: `str::from_utf8` has been changed to cast instead of allocate.
5820 * std: `starts_with` and `ends_with` methods added to vectors via the
5821 `ImmutableEqVector` trait, which is in the prelude.
5822 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
5823 if the index is out of bounds.
5824 * std: Task failure no longer propagates between tasks, as the model was
5825 complex, expensive, and incompatible with thread-based tasks.
5826 * std: The `Any` type can be used for dynamic typing.
5827 * std: `~Any` can be passed to the `fail!` macro and retrieved via
5829 * std: Methods that produce iterators generally do not have an `_iter`
5831 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
5832 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
5833 * std: `util::ignore` renamed to `prelude::drop`.
5834 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
5836 * std: `vec::raw` has seen a lot of cleanup and API changes.
5837 * std: The standard library no longer includes any C++ code, and very
5838 minimal C, eliminating the dependency on libstdc++.
5839 * std: Runtime scheduling and I/O functionality has been factored out into
5840 extensible interfaces and is now implemented by two different crates:
5841 libnative, for native threading and I/O; and libgreen, for green threading
5842 and I/O. This paves the way for using the standard library in more limited
5843 embedded environments.
5844 * std: The `comm` module has been rewritten to be much faster, have a
5845 simpler, more consistent API, and to work for both native and green
5847 * std: All libuv dependencies have been moved into the rustuv crate.
5848 * native: New implementations of runtime scheduling on top of OS threads.
5849 * native: New native implementations of TCP, UDP, file I/O, process spawning,
5851 * green: The green thread scheduler and message passing types are almost
5853 * extra: The `flatpipes` module had bitrotted and was removed.
5854 * extra: All crypto functions have been removed and Rust now has a policy of
5855 not reimplementing crypto in the standard library. In the future crypto
5856 will be provided by external crates with bindings to established libraries.
5857 * extra: `c_vec` has been modernized.
5858 * extra: The `sort` module has been removed. Use the `sort` method on
5862 * The `rust` and `rusti` commands have been removed, due to lack of
5864 * `rustdoc` was completely rewritten.
5865 * `rustdoc` can test code examples in documentation.
5866 * `rustpkg` can test packages with the argument, 'test'.
5867 * `rustpkg` supports arbitrary dependencies, including C libraries.
5868 * `rustc`'s support for generating debug info is improved again.
5869 * `rustc` has better error reporting for unbalanced delimiters.
5870 * `rustc`'s JIT support was removed due to bitrot.
5871 * Executables and static libraries can be built with LTO (-Z lto)
5872 * `rustc` adds a `--dep-info` flag for communicating dependencies to
5876 Version 0.8 (2013-09-26)
5877 ============================
5879 * ~2200 changes, numerous bugfixes
5882 * The `for` loop syntax has changed to work with the `Iterator` trait.
5883 * At long last, unwinding works on Windows.
5884 * Default methods are ready for use.
5885 * Many trait inheritance bugs fixed.
5886 * Owned and borrowed trait objects work more reliably.
5887 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
5888 * rustc can omit emission of code for the `debug!` macro if it is passed
5890 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
5891 for foo.rs, then foo/mod.rs, and will generate an error when both are
5893 * Strings no longer contain trailing nulls. The new `std::c_str` module
5894 provides new mechanisms for converting to C strings.
5895 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
5896 * The FFI has been overhauled such that foreign functions are called directly,
5897 instead of through a stack-switching wrapper.
5898 * Calling a foreign function must be done through a Rust function with the
5899 `#[fixed_stack_segment]` attribute.
5900 * The `externfn!` macro can be used to declare both a foreign function and
5901 a `#[fixed_stack_segment]` wrapper at once.
5902 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
5903 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
5904 * `priv` is disallowed everywhere except for struct fields and enum variants.
5905 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
5906 * `ref` bindings in irrefutable patterns work correctly now.
5907 * `char` is now prevented from containing invalid code points.
5908 * Casting to `bool` is no longer allowed.
5909 * `\0` is now accepted as an escape in chars and strings.
5910 * `yield` is a reserved keyword.
5911 * `typeof` is a reserved keyword.
5912 * Crates may be imported by URL with `extern mod foo = "url";`.
5913 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
5914 * Static vectors can be initialized with repeating elements,
5915 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
5916 * Static structs can be initialized with functional record update,
5917 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
5918 * `cfg!` can be used to conditionally execute code based on the crate
5919 configuration, similarly to `#[cfg(...)]`.
5920 * The `unnecessary_qualification` lint detects unneeded module
5921 prefixes (default: allow).
5922 * Arithmetic operations have been implemented on the SIMD types in
5923 `std::unstable::simd`.
5924 * Exchange allocation headers were removed, reducing memory usage.
5925 * `format!` implements a completely new, extensible, and higher-performance
5926 string formatting system. It will replace `fmt!`.
5927 * `print!` and `println!` write formatted strings (using the `format!`
5928 extension) to stdout.
5929 * `write!` and `writeln!` write formatted strings (using the `format!`
5930 extension) to the new Writers in `std::rt::io`.
5931 * The library section in which a function or static is placed may
5932 be specified with `#[link_section = "..."]`.
5933 * The `proto!` syntax extension for defining bounded message protocols
5935 * `macro_rules!` is hygienic for `let` declarations.
5936 * The `#[export_name]` attribute specifies the name of a symbol.
5937 * `unreachable!` can be used to indicate unreachable code, and fails
5941 * std: Transitioned to the new runtime, written in Rust.
5942 * std: Added an experimental I/O library, `rt::io`, based on the new
5944 * std: A new generic `range` function was added to the prelude, replacing
5945 `uint::range` and friends.
5946 * std: `range_rev` no longer exists. Since range is an iterator it can be
5947 reversed with `range(lo, hi).invert()`.
5948 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
5949 renamed to `unwrap_or`.
5950 * std: The `iterator` module was renamed to `iter`.
5951 * std: Integral types now support the `checked_add`, `checked_sub`, and
5952 `checked_mul` operations for detecting overflow.
5953 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
5955 * std: Methods are standardizing on conventions for casting methods:
5956 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
5958 * std: The `CString` type in `c_str` provides new ways to convert to and
5960 * std: `DoubleEndedIterator` can yield elements in two directions.
5961 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
5963 * std: `str::from_bytes` renamed to `str::from_utf8`.
5964 * std: `pop_opt` and `shift_opt` methods added to vectors.
5965 * std: The task-local data interface no longer uses @, and keys are
5966 no longer function pointers.
5967 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
5968 * std: Added `SharedPort` to `comm`.
5969 * std: `Eq` has a default method for `ne`; only `eq` is required
5971 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
5972 is required in implementations.
5973 * std: `is_utf8` performance is improved, impacting many string functions.
5974 * std: `os::MemoryMap` provides cross-platform mmap.
5975 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
5976 are not 'in-bounds' are considered undefined.
5977 * std: Many freestanding functions in `vec` removed in favor of methods.
5978 * std: Many freestanding functions on scalar types removed in favor of
5980 * std: Many options to task builders were removed since they don't make
5981 sense in the new scheduler design.
5982 * std: More containers implement `FromIterator` so can be created by the
5984 * std: More complete atomic types in `unstable::atomics`.
5985 * std: `comm::PortSet` removed.
5986 * std: Mutating methods in the `Set` and `Map` traits have been moved into
5987 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
5988 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
5989 default implementations.
5990 * std: Various `from_str` functions were removed in favor of a generic
5991 `from_str` which is available in the prelude.
5992 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
5993 * extra: `dlist`, the doubly-linked list was modernized.
5994 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
5995 * extra: Added `glob` module, replacing `std::os::glob`.
5996 * extra: `rope` was removed.
5997 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
5998 * extra: `net`, and `timer` were removed. The experimental replacements
5999 are `std::rt::io::net` and `std::rt::io::timer`.
6000 * extra: Iterators implemented for `SmallIntMap`.
6001 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6002 * extra: `SmallIntSet` removed. Use `BitvSet`.
6003 * extra: Performance of JSON parsing greatly improved.
6004 * extra: `semver` updated to SemVer 2.0.0.
6005 * extra: `term` handles more terminals correctly.
6006 * extra: `dbg` module removed.
6007 * extra: `par` module removed.
6008 * extra: `future` was cleaned up, with some method renames.
6009 * extra: Most free functions in `getopts` were converted to methods.
6012 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6013 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6014 similarly to gcc's `--march` flag.
6015 * rustc's performance compiling small crates is much better.
6016 * rustpkg has received many improvements.
6017 * rustpkg supports git tags as package IDs.
6018 * rustpkg builds into target-specific directories so it can be used for
6020 * The number of concurrent test tasks is controlled by the environment
6021 variable RUST_TEST_TASKS.
6022 * The test harness can now report metrics for benchmarks.
6023 * All tools have man pages.
6024 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6025 * The runtime uses jemalloc for allocations.
6026 * Segmented stacks are temporarily disabled as part of the transition to
6027 the new runtime. Stack overflows are possible!
6028 * A new documentation backend, rustdoc_ng, is available for use. It is
6029 still invoked through the normal `rustdoc` command.
6032 Version 0.7 (2013-07-03)
6033 =======================
6035 * ~2000 changes, numerous bugfixes
6038 * `impl`s no longer accept a visibility qualifier. Put them on methods
6040 * The borrow checker has been rewritten with flow-sensitivity, fixing
6041 many bugs and inconveniences.
6042 * The `self` parameter no longer implicitly means `&'self self`,
6043 and can be explicitly marked with a lifetime.
6044 * Overloadable compound operators (`+=`, etc.) have been temporarily
6045 removed due to bugs.
6046 * The `for` loop protocol now requires `for`-iterators to return `bool`
6047 so they compose better.
6048 * The `Durable` trait is replaced with the `'static` bounds.
6049 * Trait default methods work more often.
6050 * Structs with the `#[packed]` attribute have byte alignment and
6051 no padding between fields.
6052 * Type parameters bound by `Copy` must now be copied explicitly with
6054 * It is now illegal to move out of a dereferenced unsafe pointer.
6055 * `Option<~T>` is now represented as a nullable pointer.
6056 * `@mut` does dynamic borrow checks correctly.
6057 * The `main` function is only detected at the topmost level of the crate.
6058 The `#[main]` attribute is still valid anywhere.
6059 * Struct fields may no longer be mutable. Use inherited mutability.
6060 * The `#[no_send]` attribute makes a type that would otherwise be
6062 * The `#[no_freeze]` attribute makes a type that would otherwise be
6064 * Unbounded recursion will abort the process after reaching the limit
6065 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6066 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6067 are never implicitly copyable.
6068 * `#[static_assert]` makes compile-time assertions about static bools.
6069 * At long last, 'argument modes' no longer exist.
6070 * The rarely used `use mod` statement no longer exists.
6073 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6075 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6076 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6078 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6079 and unsuffixed integer literals.
6082 * The `core` crate was renamed to `std`.
6083 * The `std` crate was renamed to `extra`.
6084 * More and improved documentation.
6085 * std: `iterator` module for external iterator objects.
6086 * Many old-style (internal, higher-order function) iterators replaced by
6087 implementations of `Iterator`.
6088 * std: Many old internal vector and string iterators,
6089 incl. `any`, `all`. removed.
6090 * std: The `finalize` method of `Drop` renamed to `drop`.
6091 * std: The `drop` method now takes `&mut self` instead of `&self`.
6092 * std: The prelude no longer re-exports any modules, only types and traits.
6093 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6094 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6095 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6096 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6097 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6098 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6099 * std: Many types implement `Clone`.
6100 * std: `path` type renamed to `Path`.
6101 * std: `mut` module and `Mut` type removed.
6102 * std: Many standalone functions removed in favor of methods and iterators
6103 in `vec`, `str`. In the future methods will also work as functions.
6104 * std: `reinterpret_cast` removed. Use `transmute`.
6105 * std: ascii string handling in `std::ascii`.
6106 * std: `Rand` is implemented for ~/@.
6107 * std: `run` module for spawning processes overhauled.
6108 * std: Various atomic types added to `unstable::atomic`.
6109 * std: Various types implement `Zero`.
6110 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6111 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6112 * std: Added `os::mkdir_recursive`.
6113 * std: Added `os::glob` function performs filesystems globs.
6114 * std: `FuzzyEq` renamed to `ApproxEq`.
6115 * std: `Map` now defines `pop` and `swap` methods.
6116 * std: `Cell` constructors converted to static methods.
6117 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6118 * extra: `flate` module moved from `std` to `extra`.
6119 * extra: `fileinput` module for iterating over a series of files.
6120 * extra: `Complex` number type and `complex` module.
6121 * extra: `Rational` number type and `rational` module.
6122 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6123 * extra: `term` uses terminfo now, is more correct.
6124 * extra: `arc` functions converted to methods.
6125 * extra: Implementation of fixed output size variations of SHA-2.
6128 * `unused_variable` lint mode for unused variables (default: warn).
6129 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6131 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6133 * `dead_assignment` lint mode for unread variables (default: warn).
6134 * `unnecessary_allocation` lint mode detects some heap allocations that are
6135 immediately borrowed so could be written without allocating (default: warn).
6136 * `missing_doc` lint mode (default: allow).
6137 * `unreachable_code` lint mode (default: warn).
6138 * The `rusti` command has been rewritten and a number of bugs addressed.
6139 * rustc outputs in color on more terminals.
6140 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6141 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6142 * Compiling with `-g` will make the binary record information about
6143 dynamic borrowcheck failures for debugging.
6144 * rustdoc has a nicer stylesheet.
6145 * Various improvements to rustdoc.
6146 * Improvements to rustpkg (see the detailed release notes).
6149 Version 0.6 (2013-04-03)
6150 ========================
6152 * ~2100 changes, numerous bugfixes
6155 * The self type parameter in traits is now spelled `Self`
6156 * The `self` parameter in trait and impl methods must now be explicitly
6157 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6158 * Static methods no longer require the `static` keyword and instead
6159 are distinguished by the lack of a `self` parameter
6160 * Replaced the `Durable` trait with the `'static` lifetime
6161 * The old closure type syntax with the trailing sigil has been
6162 removed in favor of the more consistent leading sigil
6163 * `super` is a keyword, and may be prefixed to paths
6164 * Trait bounds are separated with `+` instead of whitespace
6165 * Traits are implemented with `impl Trait for Type`
6166 instead of `impl Type: Trait`
6167 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6168 * The `export` keyword has finally been removed
6169 * The `move` keyword has been removed (see "Semantic changes")
6170 * The interior mutability qualifier on vectors, `[mut T]`, has been
6171 removed. Use `&mut [T]`, etc.
6172 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6173 * `fail` is no longer a keyword. Use `fail!()`
6174 * `assert` is no longer a keyword. Use `assert!()`
6175 * `log` is no longer a keyword. use `debug!`, etc.
6176 * 1-tuples may be represented as `(T,)`
6177 * Struct fields may no longer be `mut`. Use inherited mutability,
6178 `@mut T`, `core::mut` or `core::cell`
6179 * `extern mod { ... }` is no longer valid syntax for foreign
6180 function modules. Use extern blocks: `extern { ... }`
6181 * Newtype enums removed. Use tuple-structs.
6182 * Trait implementations no longer support visibility modifiers
6183 * Pattern matching over vectors improved and expanded
6184 * `const` renamed to `static` to correspond to lifetime name,
6185 and make room for future `static mut` unsafe mutable globals.
6186 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6187 * `Clone` implementations can be automatically generated with
6188 `#[deriving(Clone)]`
6189 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6190 instead of `foo as Bar`.
6191 * Fixed length vector types are now written as `[int, .. 3]`
6192 instead of `[int * 3]`.
6193 * Fixed length vector types can express the length as a constant
6194 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6197 * Types with owned pointers or custom destructors move by default,
6198 eliminating the `move` keyword
6199 * All foreign functions are considered unsafe
6200 * &mut is now unaliasable
6201 * Writes to borrowed @mut pointers are prevented dynamically
6203 * The name of the main function can be customized using #[main]
6204 * The default type of an inferred closure is &fn instead of @fn
6205 * `use` statements may no longer be "chained" - they cannot import
6206 identifiers imported by previous `use` statements
6207 * `use` statements are crate relative, importing from the "top"
6208 of the crate by default. Paths may be prefixed with `super::`
6209 or `self::` to change the search behavior.
6210 * Method visibility is inherited from the implementation declaration
6211 * Structural records have been removed
6212 * Many more types can be used in static items, including enums
6213 'static-lifetime pointers and vectors
6214 * Pattern matching over vectors improved and expanded
6215 * Typechecking of closure types has been overhauled to
6216 improve inference and eliminate unsoundness
6217 * Macros leave scope at the end of modules, unless that module is
6218 tagged with #[macro_escape]
6221 * Added big integers to `std::bigint`
6222 * Removed `core::oldcomm` module
6223 * Added pipe-based `core::comm` module
6224 * Numeric traits have been reorganized under `core::num`
6225 * `vec::slice` finally returns a slice
6226 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6227 * Containers reorganized around traits in `core::container`
6228 * `core::dvec` removed, `~[T]` is a drop-in replacement
6229 * `core::send_map` renamed to `core::hashmap`
6230 * `std::map` removed; replaced with `core::hashmap`
6231 * `std::treemap` reimplemented as an owned balanced tree
6232 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6233 * `core::trie` added as a fast ordered map for integer keys
6234 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6235 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6236 overload the comparison operators, whereas `TotalOrd` is used
6237 by certain container types
6240 * Replaced the 'cargo' package manager with 'rustpkg'
6241 * Added all-purpose 'rust' tool
6242 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6243 * rustc now *attempts* to offer spelling suggestions
6244 * Improved support for ARM and Android
6245 * Preliminary MIPS backend
6246 * Improved foreign function ABI implementation for x86, x86_64
6247 * Various memory usage improvements
6248 * Rust code may be embedded in foreign code under limited circumstances
6249 * Inline assembler supported by new asm!() syntax extension.
6252 Version 0.5 (2012-12-21)
6253 ===========================
6255 * ~900 changes, numerous bugfixes
6258 * Removed `<-` move operator
6259 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6260 * Removed old fixed length vector syntax - `[T]/N`
6261 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6262 * Macros may now expand to items and statements
6263 * `a.b()` is always parsed as a method call, never as a field projection
6264 * `Eq` and `IterBytes` implementations can be automatically generated
6265 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6266 * Removed the special crate language for `.rc` files
6267 * Function arguments may consist of any irrefutable pattern
6270 * `&` and `~` pointers may point to objects
6271 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6272 * Enum variants may be structs
6273 * Destructors can be added to all nominal types with the Drop trait
6274 * Structs and nullary enum variants may be constants
6275 * Values that cannot be implicitly copied are now automatically moved
6276 without writing `move` explicitly
6277 * `&T` may now be coerced to `*T`
6278 * Coercions happen in `let` statements as well as function calls
6279 * `use` statements now take crate-relative paths
6280 * The module and type namespaces have been merged so that static
6281 method names can be resolved under the trait in which they are
6284 * Improved support for language features
6285 * Trait inheritance works in many scenarios
6286 * More support for explicit self arguments in methods - `self`, `&self`
6287 `@self`, and `~self` all generally work as expected
6288 * Static methods work in more situations
6289 * Experimental: Traits may declare default methods for the implementations
6293 * New condition handling system in `core::condition`
6294 * Timsort added to `std::sort`
6295 * New priority queue, `std::priority_queue`
6296 * Pipes for serializable types, `std::flatpipes'
6297 * Serialization overhauled to be trait-based
6298 * Expanded `getopts` definitions
6299 * Moved futures to `std`
6300 * More functions are pure now
6301 * `core::comm` renamed to `oldcomm`. Still deprecated
6302 * `rustdoc` and `cargo` are libraries now
6305 * Added a preliminary REPL, `rusti`
6306 * License changed from MIT to dual MIT/APL2
6309 Version 0.4 (2012-10-15)
6310 ==========================
6312 * ~2000 changes, numerous bugfixes
6315 * All keywords are now strict and may not be used as identifiers anywhere
6316 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6317 'of', 'with', 'to', 'class'.
6318 * Classes are replaced with simpler structs
6319 * Explicit method self types
6320 * `ret` became `return` and `alt` became `match`
6321 * `import` is now `use`; `use is now `extern mod`
6322 * `extern mod { ... }` is now `extern { ... }`
6323 * `use mod` is the recommended way to import modules
6324 * `pub` and `priv` replace deprecated export lists
6325 * The syntax of `match` pattern arms now uses fat arrow (=>)
6326 * `main` no longer accepts an args vector; use `os::args` instead
6329 * Trait implementations are now coherent, ala Haskell typeclasses
6330 * Trait methods may be static
6331 * Argument modes are deprecated
6332 * Borrowed pointers are much more mature and recommended for use
6333 * Strings and vectors in the static region are stored in constant memory
6334 * Typestate was removed
6335 * Resolution rewritten to be more reliable
6336 * Support for 'dual-mode' data structures (freezing and thawing)
6339 * Most binary operators can now be overloaded via the traits in
6341 * `std::net::url` for representing URLs
6342 * Sendable hash maps in `core::send_map`
6343 * `core::task' gained a (currently unsafe) task-local storage API
6346 * An efficient new intertask communication primitive called the pipe,
6347 along with a number of higher-level channel types, in `core::pipes`
6348 * `std::arc`, an atomically reference counted, immutable, shared memory
6350 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6351 * Futures are now based on pipes and sendable
6352 * More robust linked task failure
6353 * Improved task builder API
6356 * Improved error reporting
6357 * Preliminary JIT support
6358 * Preliminary work on precise GC
6359 * Extensive architectural improvements to rustc
6360 * Begun a transition away from buggy C++-based reflection (shape) code to
6361 Rust-based (visitor) code
6362 * All hash functions and tables converted to secure, randomized SipHash
6365 Version 0.3 (2012-07-12)
6366 ========================
6368 * ~1900 changes, numerous bugfixes
6370 * New coding conveniences
6371 * Integer-literal suffix inference
6372 * Per-item control over warnings, errors
6373 * #[cfg(windows)] and #[cfg(unix)] attributes
6374 * Documentation comments
6375 * More compact closure syntax
6376 * 'do' expressions for treating higher-order functions as
6378 * *-patterns (wildcard extended to all constructor fields)
6381 * Name resolution pass and exhaustiveness checker rewritten
6382 * Region pointers and borrow checking supersede alias
6384 * Init-ness checking is now provided by a region-based liveness
6385 pass instead of the typestate pass; same for last-use analysis
6386 * Extensive work on region pointers
6388 * Experimental new language features
6389 * Slices and fixed-size, interior-allocated vectors
6390 * #!-comments for lang versioning, shell execution
6391 * Destructors and iface implementation for classes;
6392 type-parameterized classes and class methods
6393 * 'const' type kind for types that can be used to implement
6394 shared-memory concurrency patterns
6398 * Removal of various obsolete features
6399 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6400 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6402 * Constructs: do-while loops ('do' repurposed), fn binding,
6403 resources (replaced by destructors)
6405 * Compiler reorganization
6406 * Syntax-layer of compiler split into separate crate
6407 * Clang (from LLVM project) integrated into build
6408 * Typechecker split into sub-modules
6411 * New time functions
6412 * Extension methods for many built-in types
6413 * Arc: atomic-refcount read-only / exclusive-use shared cells
6414 * Par: parallel map and search routines
6415 * Extensive work on libuv interface
6416 * Much vector code moved to libraries
6417 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6418 #include, #include_str, #include_bin
6421 * Cargo automatically resolves dependencies
6424 Version 0.2 (2012-03-29)
6425 =========================
6427 * >1500 changes, numerous bugfixes
6429 * New docs and doc tooling
6431 * New port: FreeBSD x86_64
6433 * Compilation model enhancements
6434 * Generics now specialized, multiply instantiated
6435 * Functions now inlined across separate crates
6437 * Scheduling, stack and threading fixes
6438 * Noticeably improved message-passing performance
6439 * Explicit schedulers
6443 * Experimental new language features
6444 * Operator overloading
6448 * Various language extensions
6449 * C-callback function types: 'crust fn ...'
6450 * Infinite-loop construct: 'loop { ... }'
6451 * Shorten 'mutable' to 'mut'
6452 * Required mutable-local qualifier: 'let mut ...'
6453 * Basic glob-exporting: 'export foo::*;'
6454 * Alt now exhaustive, 'alt check' for runtime-checked
6455 * Block-function form of 'for' loop, with 'break' and 'ret'.
6458 * AST quasi-quote syntax extension
6459 * Revived libuv interface
6460 * New modules: core::{future, iter}, std::arena
6461 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6462 * Extensive cleanup, regularization in libstd, libcore
6465 Version 0.1 (2012-01-20)
6466 ===============================
6468 * Most language features work, including:
6469 * Unique pointers, unique closures, move semantics
6470 * Interface-constrained generics
6471 * Static interface dispatch
6473 * Multithread task scheduling
6474 * Typestate predicates
6475 * Failure unwinding, destructors
6476 * Pattern matching and destructuring assignment
6477 * Lightweight block-lambda syntax
6478 * Preliminary macro-by-example
6480 * Compiler works with the following configurations:
6481 * Linux: x86 and x86_64 hosts and targets
6482 * macOS: x86 and x86_64 hosts and targets
6483 * Windows: x86 hosts and targets
6485 * Cross compilation / multi-target configuration supported.
6487 * Preliminary API-documentation and package-management tools included.
6491 * Documentation is incomplete.
6493 * Performance is below intended target.
6495 * Standard library APIs are subject to extensive change, reorganization.
6497 * Language-level versioning is not yet operational - future code will