1 Version 1.55.0 (2021-09-09)
2 ============================
6 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
7 will end at the maximum value of the integer.][83918]
8 - [You can now explicitly import the prelude of different editions
9 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
13 - [Added tier 3\* support for `powerpc-unknown-freebsd`.][87370]
14 - [Added tier 3 support for `powerpc64le-unknown-freebsd`.][83572]
16 \* Refer to Rust's [platform support page][platform-support-doc] for more
17 information on Rust's tiered platform support.
22 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
23 These improvements should in general provide faster string parsing of floats,
24 no longer reject certain valid floating point values, and reduce
25 the produced code size for non-stripped artifacts.
26 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
27 - [`collections::{BinaryHeap, BTreeSet, HashSet, LinkedList, VecDeque}` now
28 implement `From<[T; N]>`.][84111]
29 - [`collections::{BTreeMap, HashMap}` now implement `From<[(K, V); N]>`.][84111]
30 This allows you to write the following;
32 let highscores = std::collections::HashMap::from([
44 - [`IntoInnerError::into_error`]
45 - [`IntoInnerError::into_parts`]
46 - [`MaybeUninit::assume_init_mut`]
47 - [`MaybeUninit::assume_init_ref`]
48 - [`MaybeUninit::write`]
50 - [`ops::ControlFlow`]
52 - [`x86::_bittestandcomplement`]
53 - [`x86::_bittestandreset`]
54 - [`x86::_bittestandset`]
55 - [`x86_64::_bittest64`]
56 - [`x86_64::_bittestandcomplement64`]
57 - [`x86_64::_bittestandreset64`]
58 - [`x86_64::_bittestandset64`]
60 The following previously stable functions are now `const`.
62 - [`str::from_utf8_unchecked`]
68 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
69 rustc in parallel such as when using `cargo test`.][cargo/9675]
70 - [The package definition in `cargo metadata` now includes the `"default_run"`
71 field from the manifest.][cargo/9550]
72 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
76 - [Added "Go to item on exact match" search option.][85876]
77 - [The "Implementors" section on traits no longer shows redundant
78 method definitions.][85970]
79 - [Trait implementations are toggled open by default.][86260] This should make the
80 implementations more searchable by tools like `CTRL+F` in your browser.
81 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
82 through type aliases.][86334]
83 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
84 "Trait Implementations" section.][86513]
89 - [std functions that return an `io::Error` will no longer use the
90 `ErrorKind::Other` variant.][85746] This is to better reflect that these
91 kinds of errors could be categorised [into newer more specific `ErrorKind`
92 variants][79965], and that they do not represent a user error.
93 - [Using environment variable names with `process::Command` on Windows now
94 behaves as expected.][85270] Previously using envionment variables with
95 `Command` would cause them to be ASCII-uppercased.
96 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
97 with `rustdoc::`][86849]
99 [86849]: https://github.com/rust-lang/rust/pull/86849
100 [86513]: https://github.com/rust-lang/rust/pull/86513
101 [86334]: https://github.com/rust-lang/rust/pull/86334
102 [86260]: https://github.com/rust-lang/rust/pull/86260
103 [85970]: https://github.com/rust-lang/rust/pull/85970
104 [85876]: https://github.com/rust-lang/rust/pull/85876
105 [83572]: https://github.com/rust-lang/rust/pull/83572
106 [86294]: https://github.com/rust-lang/rust/pull/86294
107 [86858]: https://github.com/rust-lang/rust/pull/86858
108 [86761]: https://github.com/rust-lang/rust/pull/86761
109 [85769]: https://github.com/rust-lang/rust/pull/85769
110 [85746]: https://github.com/rust-lang/rust/pull/85746
111 [85305]: https://github.com/rust-lang/rust/pull/85305
112 [85270]: https://github.com/rust-lang/rust/pull/85270
113 [84111]: https://github.com/rust-lang/rust/pull/84111
114 [83918]: https://github.com/rust-lang/rust/pull/83918
115 [79965]: https://github.com/rust-lang/rust/pull/79965
116 [87370]: https://github.com/rust-lang/rust/pull/87370
117 [87298]: https://github.com/rust-lang/rust/pull/87298
118 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
119 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
120 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
121 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
122 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
123 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
124 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
125 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
126 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
127 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
128 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
129 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
130 [`mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
131 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
132 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
133 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
134 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
135 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
136 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
137 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
138 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
139 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
140 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
143 Version 1.54.0 (2021-07-29)
144 ============================
147 -----------------------
149 - [You can now use macros for values in built-in attribute macros.][83366]
150 While a seemingly minor addition on its own, this enables a lot of
151 powerful functionality when combined correctly. Most notably you can
152 now include external documentation in your crate by writing the following.
154 #![doc = include_str!("README.md")]
156 You can also use this to include auto-generated modules:
158 #[path = concat!(env!("OUT_DIR"), "/generated.rs")]
162 - [You can now cast between unsized slice types (and types which contain
163 unsized slices) in `const fn`.][85078]
164 - [You can now use multiple generic lifetimes with `impl Trait` where the
165 lifetimes don't explicitly outlive another.][84701] In code this means
166 that you can now have `impl Trait<'a, 'b>` where as before you could
167 only have `impl Trait<'a, 'b> where 'b: 'a`.
170 -----------------------
172 - [Rustc will now search for custom JSON targets in
173 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
174 directory.][83800] You can find your sysroot directory by running
175 `rustc --print sysroot`.
176 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
177 - [You can now use `#[target_feature]` on safe functions when targeting
178 WebAssembly platforms.][84988]
179 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
180 - [Added tier 3\* support for `bpfel-unknown-none`
181 and `bpfeb-unknown-none`.][79608]
183 \* Refer to Rust's [platform support page][platform-support-doc] for more
184 information on Rust's tiered platform support.
187 -----------------------
189 - [`panic::panic_any` will now `#[track_caller]`.][85745]
190 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
191 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
192 - [The implementations of vendor intrinsics in core::arch have been
193 significantly refactored.][83278] The main user-visible changes are
194 a 50% reduction in the size of libcore.rlib and stricter validation
195 of constant operands passed to intrinsics. The latter is technically
196 a breaking change, but allows Rust to more closely match the C vendor
202 - [`BTreeMap::into_keys`]
203 - [`BTreeMap::into_values`]
204 - [`HashMap::into_keys`]
205 - [`HashMap::into_values`]
207 - [`VecDeque::binary_search`]
208 - [`VecDeque::binary_search_by`]
209 - [`VecDeque::binary_search_by_key`]
210 - [`VecDeque::partition_point`]
215 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
216 the dependency graph.][cargo/9520]
217 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
218 in the tree ][cargo/9499]
219 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
220 macro dependencies.][cargo/9488]
221 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
222 This variable points to a directory that integration tests and benches
223 can use as a "scratchpad" for testing filesystem operations.
227 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
228 - [Previously unsound code is no longer permitted where different constructors in branches
229 could require different lifetimes.][85574]
230 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
231 than before and may reject some previously accepted code.
232 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
233 when compiled with `codegen-units = 1`.][86063]
235 [85574]: https://github.com/rust-lang/rust/issues/85574
236 [86831]: https://github.com/rust-lang/rust/issues/86831
237 [86063]: https://github.com/rust-lang/rust/issues/86063
238 [86831]: https://github.com/rust-lang/rust/issues/86831
239 [79608]: https://github.com/rust-lang/rust/pull/79608
240 [84988]: https://github.com/rust-lang/rust/pull/84988
241 [84701]: https://github.com/rust-lang/rust/pull/84701
242 [84072]: https://github.com/rust-lang/rust/pull/84072
243 [85745]: https://github.com/rust-lang/rust/pull/85745
244 [84744]: https://github.com/rust-lang/rust/pull/84744
245 [85078]: https://github.com/rust-lang/rust/pull/85078
246 [84717]: https://github.com/rust-lang/rust/pull/84717
247 [83800]: https://github.com/rust-lang/rust/pull/83800
248 [83366]: https://github.com/rust-lang/rust/pull/83366
249 [83278]: https://github.com/rust-lang/rust/pull/83278
250 [85292]: https://github.com/rust-lang/rust/pull/85292
251 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
252 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
253 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
254 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
255 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
256 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
257 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
258 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
259 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
260 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
261 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
263 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
265 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
267 Version 1.53.0 (2021-06-17)
268 ============================
271 -----------------------
272 - [You can now use unicode for identifiers.][83799] This allows multilingual
273 identifiers but still doesn't allow glyphs that are not considered characters
274 such as `◆` or `🦀`. More specifically you can now use any identifier that
275 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
276 is the same standard as languages like Python, however Rust uses NFC
277 normalization which may be different from other languages.
278 - [You can now specify "or patterns" inside pattern matches.][79278]
279 Previously you could only use `|` (OR) on complete patterns. E.g.
283 matches!(x, Some(1) | Some(2));
285 matches!(x, Some(1 | 2));
287 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
288 has the same semantics as the `:pat` matcher. This is to allow `:pat`
289 to change semantics to being a pattern fragment in a future edition.
292 -----------------------
293 - [Updated the minimum external LLVM version to LLVM 10.][83387]
294 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
295 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
297 \* Refer to Rust's [platform support page][platform-support-doc] for more
298 information on Rust's tiered platform support.
301 -----------------------
302 - [Abort messages will now forward to `android_set_abort_message` on
303 Android platforms when available.][81469]
304 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
305 - [Arrays of any length now implement `IntoIterator`.][84147]
306 Currently calling `.into_iter()` as a method on an array will
307 return `impl Iterator<Item=&T>`, but this may change in a
308 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
309 directly on arrays will provide `impl Iterator<Item=T>` as expected.
310 - [`leading_zeros`, and `trailing_zeros` are now available on all
311 `NonZero` integer types.][84082]
312 - [`{f32, f64}::from_str` now parse and print special values
313 (`NaN`, `-0`) according to IEEE 754.][78618]
314 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
315 - [Add the `BITS` associated constant to all numeric types.][82565]
319 - [`AtomicBool::fetch_update`]
320 - [`AtomicPtr::fetch_update`]
321 - [`BTreeMap::retain`]
322 - [`BTreeSet::retain`]
323 - [`BufReader::seek_relative`]
324 - [`DebugStruct::non_exhaustive`]
327 - [`Duration::is_zero`]
328 - [`Duration::saturating_add`]
329 - [`Duration::saturating_mul`]
330 - [`Duration::saturating_sub`]
331 - [`ErrorKind::Unsupported`]
333 - [`Ordering::is_eq`]
334 - [`Ordering::is_ge`]
335 - [`Ordering::is_gt`]
336 - [`Ordering::is_le`]
337 - [`Ordering::is_lt`]
338 - [`Ordering::is_ne`]
339 - [`OsStr::is_ascii`]
340 - [`OsStr::make_ascii_lowercase`]
341 - [`OsStr::make_ascii_uppercase`]
342 - [`OsStr::to_ascii_lowercase`]
343 - [`OsStr::to_ascii_uppercase`]
344 - [`Peekable::peek_mut`]
345 - [`Rc::decrement_strong_count`]
346 - [`Rc::increment_strong_count`]
347 - [`Vec::extend_from_within`]
348 - [`array::from_mut`]
349 - [`array::from_ref`]
350 - [`cmp::max_by_key`]
352 - [`cmp::min_by_key`]
354 - [`f32::is_subnormal`]
355 - [`f64::is_subnormal`]
358 -----------------------
359 - [Cargo now supports git repositories where the default `HEAD` branch is not
360 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
361 which can handle default branches correctly.
362 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
363 - [The `authors` field is no longer included in `Cargo.toml` for new
364 projects.][cargo/9282]
367 -----------------------
368 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
369 without hyperlinks.][81764]
373 - [Implement token-based handling of attributes during expansion][82608]
374 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
375 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
376 to confusion and potential security vulnerabilities and [is no
377 longer recommended][ietf6943].
378 - [The added `BITS` constant may conflict with external definitions.][85667]
379 In particular, this was known to be a problem in the `lexical-core` crate,
380 but they have published fixes for semantic versions 0.4 through 0.7. To
381 update this dependency alone, use `cargo update -p lexical-core`.
382 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
386 These changes provide no direct user facing benefits, but represent significant
387 improvements to the internals and overall performance of rustc and
390 - [Rework the `std::sys::windows::alloc` implementation.][83065]
391 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
392 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
393 - [Rework rustdoc const type][82873]
395 [85667]: https://github.com/rust-lang/rust/pull/85667
396 [83386]: https://github.com/rust-lang/rust/pull/83386
397 [82771]: https://github.com/rust-lang/rust/pull/82771
398 [84147]: https://github.com/rust-lang/rust/pull/84147
399 [84082]: https://github.com/rust-lang/rust/pull/84082
400 [83799]: https://github.com/rust-lang/rust/pull/83799
401 [83681]: https://github.com/rust-lang/rust/pull/83681
402 [83652]: https://github.com/rust-lang/rust/pull/83652
403 [83387]: https://github.com/rust-lang/rust/pull/83387
404 [82873]: https://github.com/rust-lang/rust/pull/82873
405 [82864]: https://github.com/rust-lang/rust/pull/82864
406 [82608]: https://github.com/rust-lang/rust/pull/82608
407 [82565]: https://github.com/rust-lang/rust/pull/82565
408 [80525]: https://github.com/rust-lang/rust/pull/80525
409 [79278]: https://github.com/rust-lang/rust/pull/79278
410 [78618]: https://github.com/rust-lang/rust/pull/78618
411 [77704]: https://github.com/rust-lang/rust/pull/77704
412 [83941]: https://github.com/rust-lang/rust/pull/83941
413 [83065]: https://github.com/rust-lang/rust/pull/83065
414 [81764]: https://github.com/rust-lang/rust/pull/81764
415 [81469]: https://github.com/rust-lang/rust/pull/81469
416 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
417 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
418 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
419 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
420 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
421 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
422 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
423 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
424 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
425 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
426 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
427 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
428 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
429 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
430 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
431 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
432 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
433 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
434 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
435 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
436 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
437 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
438 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
439 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
440 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
441 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
442 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
443 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
444 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
445 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
446 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
447 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
448 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
449 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
450 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
451 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
452 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
453 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
454 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
455 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
456 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
457 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
460 Version 1.52.1 (2021-05-10)
461 ============================
463 This release disables incremental compilation, unless the user has explicitly
464 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
466 This is due to the widespread, and frequently occuring, breakage encountered by
467 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
468 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
469 newly added incremental verification are still present in past stable versions,
470 and are not yet fixed on any channel. These bugs can lead to miscompilation of
473 These problems only affect incremental builds, so release builds with Cargo
474 should not be affected unless the user has explicitly opted into incremental.
475 Debug and check builds are affected.
477 See [84970] for more details.
479 [84970]: https://github.com/rust-lang/rust/issues/84970
481 Version 1.52.0 (2021-05-06)
482 ============================
486 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
487 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
488 is allowed by default, and may become a warning or hard error in a
490 - [You can now cast mutable references to arrays to a pointer of the same type as
495 - [Upgraded the default LLVM to LLVM 12.][81451]
497 Added tier 3\* support for the following targets.
499 - [`s390x-unknown-linux-musl`][82166]
500 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
501 - [`powerpc-unknown-openbsd`][82733]
503 \* Refer to Rust's [platform support page][platform-support-doc] for more
504 information on Rust's tiered platform support.
508 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
509 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
510 - [`Arc<impl Error>` now implements `error::Error`.][80553]
511 - [All integer division and remainder operations are now `const`.][80962]
515 - [`Arguments::as_str`]
517 - [`char::REPLACEMENT_CHARACTER`]
518 - [`char::UNICODE_VERSION`]
519 - [`char::decode_utf16`]
520 - [`char::from_digit`]
521 - [`char::from_u32_unchecked`]
523 - [`slice::partition_point`]
524 - [`str::rsplit_once`]
525 - [`str::split_once`]
527 The following previously stable APIs are now `const`.
530 - [`char::len_utf16`]
531 - [`char::to_ascii_uppercase`]
532 - [`char::to_ascii_lowercase`]
533 - [`char::eq_ignore_ascii_case`]
534 - [`u8::to_ascii_uppercase`]
535 - [`u8::to_ascii_lowercase`]
536 - [`u8::eq_ignore_ascii_case`]
540 - [Rustdoc lints are now treated as a tool lint, meaning that
541 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
542 Using the old style is still allowed, and will become a warning in
544 - [Rustdoc now supports argument files.][82261]
545 - [Rustdoc now generates smart punctuation for documentation.][79423]
546 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
554 - [You can now pass multiple filters to tests.][81356] E.g.
555 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
556 - [Rustup now distributes PDB symbols for the `std` library on Windows,
557 allowing you to see `std` symbols when debugging.][82218]
561 These changes provide no direct user facing benefits, but represent significant
562 improvements to the internals and overall performance of rustc and
565 - [Check the result cache before the DepGraph when ensuring queries][81855]
566 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
567 - [Only store a LocalDefId in some HIR nodes][81611]
568 - [Store HIR attributes in a side table][79519]
572 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
573 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
574 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
575 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
576 languages in code blocks.][78429]
577 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
578 - [Changes in how proc macros handle whitespace may lead to panics when used
579 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
580 - [Turn `#[derive]` into a regular macro attribute][79078]
582 [84136]: https://github.com/rust-lang/rust/issues/84136
583 [80763]: https://github.com/rust-lang/rust/pull/80763
584 [82166]: https://github.com/rust-lang/rust/pull/82166
585 [82121]: https://github.com/rust-lang/rust/pull/82121
586 [81879]: https://github.com/rust-lang/rust/pull/81879
587 [82261]: https://github.com/rust-lang/rust/pull/82261
588 [82218]: https://github.com/rust-lang/rust/pull/82218
589 [82216]: https://github.com/rust-lang/rust/pull/82216
590 [82202]: https://github.com/rust-lang/rust/pull/82202
591 [81855]: https://github.com/rust-lang/rust/pull/81855
592 [81766]: https://github.com/rust-lang/rust/pull/81766
593 [81744]: https://github.com/rust-lang/rust/pull/81744
594 [81611]: https://github.com/rust-lang/rust/pull/81611
595 [81479]: https://github.com/rust-lang/rust/pull/81479
596 [81451]: https://github.com/rust-lang/rust/pull/81451
597 [81356]: https://github.com/rust-lang/rust/pull/81356
598 [80962]: https://github.com/rust-lang/rust/pull/80962
599 [80553]: https://github.com/rust-lang/rust/pull/80553
600 [80527]: https://github.com/rust-lang/rust/pull/80527
601 [79519]: https://github.com/rust-lang/rust/pull/79519
602 [79423]: https://github.com/rust-lang/rust/pull/79423
603 [79208]: https://github.com/rust-lang/rust/pull/79208
604 [78429]: https://github.com/rust-lang/rust/pull/78429
605 [82733]: https://github.com/rust-lang/rust/pull/82733
606 [82594]: https://github.com/rust-lang/rust/pull/82594
607 [79078]: https://github.com/rust-lang/rust/pull/79078
608 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
609 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
610 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
611 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
612 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
613 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
614 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
615 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
616 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
617 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
618 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
619 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
620 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
621 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
622 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
623 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
624 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
625 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
626 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
627 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
628 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
629 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
631 Version 1.51.0 (2021-03-25)
632 ============================
636 - [You can now parameterize items such as functions, traits, and `struct`s by constant
637 values in addition to by types and lifetimes.][79135] Also known as "const generics"
638 E.g. you can now write the following. Note: Only values of primitive integers,
639 `bool`, or `char` types are currently permitted.
641 struct GenericArray<T, const LENGTH: usize> {
645 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
646 const fn last(&self) -> Option<&T> {
650 Some(&self.inner[LENGTH - 1])
660 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
661 This option controls whether debug information is split across multiple files
662 or packed into a single file. **Note** This option is unstable on other platforms.
663 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
664 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
665 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
666 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
668 \* Refer to Rust's [platform support page][platform-support-doc] for more
669 information on Rust's tiered platform support.
674 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
675 - [`str` now implements `AsMut<str>`.][80279]
676 - [`u64` and `u128` now implement `From<char>`.][79502]
677 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
678 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
679 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
680 - [`io::Empty` now implements `io::Seek`.][78044]
681 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
682 `T: ?Sized` types.][80764]
683 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
689 - [`Arc::decrement_strong_count`]
690 - [`Arc::increment_strong_count`]
691 - [`Once::call_once_force`]
692 - [`Peekable::next_if_eq`]
693 - [`Peekable::next_if`]
694 - [`Seek::stream_position`]
695 - [`array::IntoIter`]
696 - [`panic::panic_any`]
698 - [`ptr::addr_of_mut!`]
699 - [`slice::fill_with`]
700 - [`slice::split_inclusive_mut`]
701 - [`slice::split_inclusive`]
702 - [`slice::strip_prefix`]
703 - [`slice::strip_suffix`]
704 - [`str::split_inclusive`]
705 - [`sync::OnceState`]
707 - [`VecDeque::range`]
708 - [`VecDeque::range_mut`]
712 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
713 codegen option.][cargo/9112]
714 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
715 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
716 to avoid unifying features of dependencies where that unification could be unwanted.
717 Such as using the same dependency with a `std` feature in a build scripts and
718 proc-macros, while using the `no-std` feature in the final binary. See the
719 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
724 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
725 - [You can now provide a `--default-theme` flag which sets the default theme to use for
726 documentation.][79642]
728 Various improvements to intra-doc links:
730 - [You can link to non-path primitives such as `slice`.][80181]
731 - [You can link to associated items.][74489]
732 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
736 - [You can now pass `--include-ignored` to tests (e.g. with
737 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
742 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
743 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
745 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
746 for the distributed artifacts.][81521]
747 - `armv5te-unknown-linux-gnueabi`
748 - `sparc64-unknown-linux-gnu`
749 - `thumbv7neon-unknown-linux-gnueabihf`
750 - `armv7-unknown-linux-gnueabi`
751 - `x86_64-unknown-linux-gnux32`
752 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
757 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
759 [79135]: https://github.com/rust-lang/rust/pull/79135
760 [74489]: https://github.com/rust-lang/rust/pull/74489
761 [76934]: https://github.com/rust-lang/rust/pull/76934
762 [79570]: https://github.com/rust-lang/rust/pull/79570
763 [80181]: https://github.com/rust-lang/rust/pull/80181
764 [79642]: https://github.com/rust-lang/rust/pull/79642
765 [80945]: https://github.com/rust-lang/rust/pull/80945
766 [80279]: https://github.com/rust-lang/rust/pull/80279
767 [80053]: https://github.com/rust-lang/rust/pull/80053
768 [79502]: https://github.com/rust-lang/rust/pull/79502
769 [75180]: https://github.com/rust-lang/rust/pull/75180
770 [79135]: https://github.com/rust-lang/rust/pull/79135
771 [81521]: https://github.com/rust-lang/rust/pull/81521
772 [80968]: https://github.com/rust-lang/rust/pull/80968
773 [80959]: https://github.com/rust-lang/rust/pull/80959
774 [80718]: https://github.com/rust-lang/rust/pull/80718
775 [80653]: https://github.com/rust-lang/rust/pull/80653
776 [80579]: https://github.com/rust-lang/rust/pull/80579
777 [79998]: https://github.com/rust-lang/rust/pull/79998
778 [78044]: https://github.com/rust-lang/rust/pull/78044
779 [81455]: https://github.com/rust-lang/rust/pull/81455
780 [80764]: https://github.com/rust-lang/rust/pull/80764
781 [80749]: https://github.com/rust-lang/rust/pull/80749
782 [80662]: https://github.com/rust-lang/rust/pull/80662
783 [79134]: https://github.com/rust-lang/rust/pull/79134
784 [80966]: https://github.com/rust-lang/rust/pull/80966
785 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
786 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
787 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
788 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
789 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
790 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
791 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
792 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
793 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
794 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
795 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
796 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
797 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
798 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
799 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
800 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
801 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
802 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
803 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
804 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
805 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
806 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
807 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
809 Version 1.50.0 (2021-02-11)
810 ============================
813 -----------------------
814 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
815 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
816 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
819 -----------------------
820 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
821 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
822 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
823 - [Dropped support for all cloudabi targets.][78439]
825 \* Refer to Rust's [platform support page][platform-support-doc] for more
826 information on Rust's tiered platform support.
829 -----------------------
831 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
832 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
833 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
834 This value cannot be a valid file descriptor, and now means `Option<File>` takes
835 up the same amount of space as `File`.
841 - [`btree_map::Entry::or_insert_with_key`]
844 - [`hash_map::Entry::or_insert_with_key`]
848 - [`UnsafeCell::get_mut`]
850 The following previously stable methods are now `const`.
852 - [`IpAddr::is_ipv4`]
853 - [`IpAddr::is_ipv6`]
854 - [`IpAddr::is_unspecified`]
855 - [`IpAddr::is_loopback`]
856 - [`IpAddr::is_multicast`]
857 - [`Ipv4Addr::octets`]
858 - [`Ipv4Addr::is_loopback`]
859 - [`Ipv4Addr::is_private`]
860 - [`Ipv4Addr::is_link_local`]
861 - [`Ipv4Addr::is_multicast`]
862 - [`Ipv4Addr::is_broadcast`]
863 - [`Ipv4Addr::is_documentation`]
864 - [`Ipv4Addr::to_ipv6_compatible`]
865 - [`Ipv4Addr::to_ipv6_mapped`]
866 - [`Ipv6Addr::segments`]
867 - [`Ipv6Addr::is_unspecified`]
868 - [`Ipv6Addr::is_loopback`]
869 - [`Ipv6Addr::is_multicast`]
870 - [`Ipv6Addr::to_ipv4`]
873 - [`Layout::from_size_align`]
874 - `pow` for all integer types.
875 - `checked_pow` for all integer types.
876 - `saturating_pow` for all integer types.
877 - `wrapping_pow` for all integer types.
878 - `next_power_of_two` for all unsigned integer types.
879 - `checked_next_power_of_two` for all unsigned integer types.
882 -----------------------
884 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
885 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
886 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
887 contents of that directory for changes.][cargo/8973]
888 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
893 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
894 - [Running tests will now print the total time taken to execute.][75752]
899 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
900 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
901 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
902 unhygenic `macro_rules!` macros.][79472]
903 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
904 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
905 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
906 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
907 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
908 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
910 [74989]: https://github.com/rust-lang/rust/pull/74989
911 [79261]: https://github.com/rust-lang/rust/pull/79261
912 [79896]: https://github.com/rust-lang/rust/pull/79896
913 [79484]: https://github.com/rust-lang/rust/pull/79484
914 [79472]: https://github.com/rust-lang/rust/pull/79472
915 [79270]: https://github.com/rust-lang/rust/pull/79270
916 [79003]: https://github.com/rust-lang/rust/pull/79003
917 [78864]: https://github.com/rust-lang/rust/pull/78864
918 [78636]: https://github.com/rust-lang/rust/pull/78636
919 [78439]: https://github.com/rust-lang/rust/pull/78439
920 [78343]: https://github.com/rust-lang/rust/pull/78343
921 [78296]: https://github.com/rust-lang/rust/pull/78296
922 [78068]: https://github.com/rust-lang/rust/pull/78068
923 [75752]: https://github.com/rust-lang/rust/pull/75752
924 [74699]: https://github.com/rust-lang/rust/pull/74699
925 [78142]: https://github.com/rust-lang/rust/pull/78142
926 [77484]: https://github.com/rust-lang/rust/pull/77484
927 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
928 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
929 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
930 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
931 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
932 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
933 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
934 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
935 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
936 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
937 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
938 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
939 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
940 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
941 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
942 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
943 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
944 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
945 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
946 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
947 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
948 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
949 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
950 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
951 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
952 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
953 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
954 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
955 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
956 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
957 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
958 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
959 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
960 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
963 Version 1.49.0 (2020-12-31)
964 ============================
967 -----------------------
969 - [Unions can now implement `Drop`, and you can now have a field in a union
970 with `ManuallyDrop<T>`.][77547]
971 - [You can now cast uninhabited enums to integers.][76199]
972 - [You can now bind by reference and by move in patterns.][76119] This
973 allows you to selectively borrow individual components of a type. E.g.
981 let person = Person {
982 name: String::from("Alice"),
986 // `name` is moved out of person, but `age` is referenced.
987 let Person { name, ref age } = person;
988 println!("{} {}", name, age);
992 -----------------------
994 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
995 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
996 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
997 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
998 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
999 - [Output from threads spawned in tests is now captured.][78227]
1000 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1002 \* Refer to Rust's [platform support page][platform-support-doc] for more
1003 information on Rust's tiered platform support.
1006 -----------------------
1008 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1009 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1014 - [`slice::select_nth_unstable`]
1015 - [`slice::select_nth_unstable_by`]
1016 - [`slice::select_nth_unstable_by_key`]
1018 The following previously stable methods are now `const`.
1020 - [`Poll::is_ready`]
1021 - [`Poll::is_pending`]
1024 -----------------------
1025 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1026 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1027 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1028 variable will be set if the crate being built is one the user selected to build, either
1029 with `-p` or through defaults.
1030 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1036 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1037 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1038 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1039 Previously such invalid or unused attributes could be ignored.
1040 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1041 read [this post about the changes][rustdoc-ws-post] for more details.
1042 - [Trait bounds are no longer inferred for associated types.][79904]
1046 These changes provide no direct user facing benefits, but represent significant
1047 improvements to the internals and overall performance of rustc and
1050 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1051 Local Storage model.][78201]
1052 - [Calculate visibilities once in resolve.][78077]
1053 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1054 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1057 [75991]: https://github.com/rust-lang/rust/pull/75991
1058 [78951]: https://github.com/rust-lang/rust/pull/78951
1059 [78848]: https://github.com/rust-lang/rust/pull/78848
1060 [78746]: https://github.com/rust-lang/rust/pull/78746
1061 [78376]: https://github.com/rust-lang/rust/pull/78376
1062 [78228]: https://github.com/rust-lang/rust/pull/78228
1063 [78227]: https://github.com/rust-lang/rust/pull/78227
1064 [78201]: https://github.com/rust-lang/rust/pull/78201
1065 [78109]: https://github.com/rust-lang/rust/pull/78109
1066 [78077]: https://github.com/rust-lang/rust/pull/78077
1067 [77997]: https://github.com/rust-lang/rust/pull/77997
1068 [77703]: https://github.com/rust-lang/rust/pull/77703
1069 [77547]: https://github.com/rust-lang/rust/pull/77547
1070 [77015]: https://github.com/rust-lang/rust/pull/77015
1071 [76199]: https://github.com/rust-lang/rust/pull/76199
1072 [76119]: https://github.com/rust-lang/rust/pull/76119
1073 [75914]: https://github.com/rust-lang/rust/pull/75914
1074 [79004]: https://github.com/rust-lang/rust/pull/79004
1075 [78676]: https://github.com/rust-lang/rust/pull/78676
1076 [79904]: https://github.com/rust-lang/rust/issues/79904
1077 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1078 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1079 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1080 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1081 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1082 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1083 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1084 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1085 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1086 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1087 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1089 Version 1.48.0 (2020-11-19)
1090 ==========================
1095 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1096 is still rejected *semantically*, but can now be parsed by procedural macros.
1100 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1101 `rustc` whether to link its own C runtime and libraries or to rely on a external
1102 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1103 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1104 Note: If you're using cargo you must explicitly pass the `--target` flag.
1105 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1107 \* Refer to Rust's [platform support page][platform-support-doc] for more
1108 information on Rust's tiered platform support.
1112 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1113 and `&Stderr`.][76275]
1114 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1115 - [The `matches!` macro now supports having a trailing comma.][74880]
1116 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1117 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1121 - [`slice::as_ptr_range`]
1122 - [`slice::as_mut_ptr_range`]
1123 - [`VecDeque::make_contiguous`]
1124 - [`future::pending`]
1127 The following previously stable methods are now `const fn`'s:
1129 - [`Option::is_some`]
1130 - [`Option::is_none`]
1131 - [`Option::as_ref`]
1133 - [`Result::is_err`]
1134 - [`Result::as_ref`]
1135 - [`Ordering::reverse`]
1136 - [`Ordering::then`]
1143 - [You can now link to items in `rustdoc` using the intra-doc link
1144 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1145 a link to `std::future`'s documentation. See ["Linking to items by
1146 name"][intradoc-links] for more information.
1147 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1148 when searching through `rustdoc`'s UI.][75740]
1152 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1153 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1154 promoted to `'static` lifetime any more inside `const fn`s.
1155 - [Associated type bindings on trait objects are now verified to meet the bounds
1156 declared on the trait when checking that they implement the trait.][27675]
1157 - [When trait bounds on associated types or opaque types are ambiguous, the
1158 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1159 - [Fixed recursive nonterminals not being expanded in macros during
1160 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1161 correctly handling recursive nonterminal tokens.
1162 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1163 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1164 in places where they have no effect.][73461]
1165 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1166 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1167 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1168 disallow zero-initialization.][71274]
1169 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1170 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1171 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1172 see the [`catch_unwind`] documentation for further information.
1178 These changes provide no direct user facing benefits, but represent significant
1179 improvements to the internals and overall performance of rustc and
1182 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1183 You can continue building with `make` by setting `ninja=false` in
1185 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1186 - [Made `ensure_sufficient_stack()` non-generic][76680]
1188 [78143]: https://github.com/rust-lang/rust/issues/78143
1189 [76680]: https://github.com/rust-lang/rust/pull/76680/
1190 [76030]: https://github.com/rust-lang/rust/pull/76030/
1191 [70212]: https://github.com/rust-lang/rust/pull/70212/
1192 [27675]: https://github.com/rust-lang/rust/issues/27675/
1193 [54121]: https://github.com/rust-lang/rust/issues/54121/
1194 [71274]: https://github.com/rust-lang/rust/pull/71274/
1195 [77386]: https://github.com/rust-lang/rust/pull/77386/
1196 [77153]: https://github.com/rust-lang/rust/pull/77153/
1197 [77055]: https://github.com/rust-lang/rust/pull/77055/
1198 [76275]: https://github.com/rust-lang/rust/pull/76275/
1199 [76310]: https://github.com/rust-lang/rust/pull/76310/
1200 [76420]: https://github.com/rust-lang/rust/pull/76420/
1201 [76158]: https://github.com/rust-lang/rust/pull/76158/
1202 [75857]: https://github.com/rust-lang/rust/pull/75857/
1203 [75585]: https://github.com/rust-lang/rust/pull/75585/
1204 [75740]: https://github.com/rust-lang/rust/pull/75740/
1205 [75502]: https://github.com/rust-lang/rust/pull/75502/
1206 [74880]: https://github.com/rust-lang/rust/pull/74880/
1207 [74922]: https://github.com/rust-lang/rust/pull/74922/
1208 [74430]: https://github.com/rust-lang/rust/pull/74430/
1209 [74194]: https://github.com/rust-lang/rust/pull/74194/
1210 [73461]: https://github.com/rust-lang/rust/pull/73461/
1211 [73166]: https://github.com/rust-lang/rust/pull/73166/
1212 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1213 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1214 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1215 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1216 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1217 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1218 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1219 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1220 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1221 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1222 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1223 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1224 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1225 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1226 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1229 Version 1.47.0 (2020-10-08)
1230 ==========================
1234 - [Closures will now warn when not used.][74869]
1238 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1239 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1241 - [Upgraded to LLVM 11.][73526]
1242 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1243 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1244 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1246 \* Refer to Rust's [platform support page][platform-support-doc] for more
1247 information on Rust's tiered platform support.
1251 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1252 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1253 those of length less than 33.][74060]
1254 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1255 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1256 `PartialEq`, and `PartialOrd`.][73583]
1260 - [`Ident::new_raw`]
1261 - [`Range::is_empty`]
1262 - [`RangeInclusive::is_empty`]
1263 - [`Result::as_deref`]
1264 - [`Result::as_deref_mut`]
1266 - [`pointer::offset_from`]
1270 The following previously stable APIs have now been made const.
1272 - [The `new` method for all `NonZero` integers.][73858]
1273 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1274 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1275 methods for all integers.][73858]
1276 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1277 signed integers.][73858]
1278 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1279 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1280 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1281 `is_ascii_control` methods for `char` and `u8`.][73858]
1285 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1286 You can override this by setting the following in your `Cargo.toml`.
1288 [profile.release.build-override]
1291 - [`cargo-help` will now display man pages for commands rather just the
1292 `--help` text.][cargo/8456]
1293 - [`cargo-metadata` now emits a `test` field indicating if a target has
1294 tests enabled.][cargo/8478]
1295 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1296 - [`cargo-publish` will now use an alternative registry by default if it's the
1297 only registry specified in `package.publish`.][cargo/8571]
1301 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1302 type based search.][75366]
1303 - [Added the Ayu theme to rustdoc.][71237]
1307 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1308 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1309 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1310 help to preserve more span information.][73084] These changes may cause
1311 compiliation errors if your macro was unhygenic or didn't correctly handle
1313 - [Moved support for the CloudABI target to tier 3.][75568]
1314 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1315 - [Added the `rustc-docs` component.][75560] This allows you to install
1316 and read the documentation for the compiler internal APIs. (Currently only
1317 available for `x86_64-unknown-linux-gnu`.)
1322 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
1324 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1325 [75048]: https://github.com/rust-lang/rust/pull/75048/
1326 [74163]: https://github.com/rust-lang/rust/pull/74163/
1327 [71237]: https://github.com/rust-lang/rust/pull/71237/
1328 [74869]: https://github.com/rust-lang/rust/pull/74869/
1329 [73858]: https://github.com/rust-lang/rust/pull/73858/
1330 [75716]: https://github.com/rust-lang/rust/pull/75716/
1331 [75908]: https://github.com/rust-lang/rust/pull/75908/
1332 [75516]: https://github.com/rust-lang/rust/pull/75516/
1333 [75560]: https://github.com/rust-lang/rust/pull/75560/
1334 [75568]: https://github.com/rust-lang/rust/pull/75568/
1335 [75366]: https://github.com/rust-lang/rust/pull/75366/
1336 [75204]: https://github.com/rust-lang/rust/pull/75204/
1337 [74650]: https://github.com/rust-lang/rust/pull/74650/
1338 [74419]: https://github.com/rust-lang/rust/pull/74419/
1339 [73964]: https://github.com/rust-lang/rust/pull/73964/
1340 [74021]: https://github.com/rust-lang/rust/pull/74021/
1341 [74060]: https://github.com/rust-lang/rust/pull/74060/
1342 [73893]: https://github.com/rust-lang/rust/pull/73893/
1343 [73526]: https://github.com/rust-lang/rust/pull/73526/
1344 [73583]: https://github.com/rust-lang/rust/pull/73583/
1345 [73084]: https://github.com/rust-lang/rust/pull/73084/
1346 [73197]: https://github.com/rust-lang/rust/pull/73197/
1347 [72488]: https://github.com/rust-lang/rust/pull/72488/
1348 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1349 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1350 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1351 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1352 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1353 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1354 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1355 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1356 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1357 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1358 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1359 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1360 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1361 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1362 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1365 Version 1.46.0 (2020-08-27)
1366 ==========================
1370 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1371 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1372 const functions.][73862]
1373 - [The `#[track_caller]` attribute can now be added to functions to use the
1374 function's caller's location information for panic messages.][72445]
1375 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1376 `x.0.0` over `(x.0).0`.
1377 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1378 You currently can't use `mem::transmute` in constant functions.
1382 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1383 - [Enabled static "Position Independent Executables" by default
1384 for `x86_64-unknown-linux-musl`.][70740]
1388 - [`mem::forget` is now a `const fn`.][73887]
1389 - [`String` now implements `From<char>`.][73466]
1390 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1391 integer types.][73032]
1392 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1393 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1394 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1395 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1396 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1397 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1402 - [`vec::Drain::as_slice`]
1406 Added a number of new environment variables that are now available when
1407 compiling your crate.
1409 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1410 the specific binary being compiled and the name of the crate.
1411 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1412 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1416 - [The target configuration option `abi_blacklist` has been renamed
1417 to `unsupported_abis`.][74150] The old name will still continue to work.
1418 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1419 This was previously accepted but will become a hard error in a future release.
1420 - [Rustc will fail to compile if you have a struct with
1421 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1423 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1424 ensure that spans have the correct information, and may cause breakage if you
1425 were relying on receiving spans with dummy information.
1426 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1427 a legacy installer that was replaced by a MSI installer a few years ago but
1428 was still being built.
1429 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1430 - [Rustc will no longer accept overlapping trait implementations that only
1431 differ in how the lifetime was bound.][72493]
1432 - [Rustc now correctly relates the lifetime of an existential associated
1433 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1434 you to pass a shorter lifetime than expected.
1435 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1436 The library will need to be installed for `rustc` to work, even though we
1437 expect it to be already available on most systems.
1438 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1440 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1441 exact output returned by rustc's pretty printing is an unstable
1442 implementation detail: we recommend any macro relying on it to switch to a
1443 more robust parsing system.
1445 [75453]: https://github.com/rust-lang/rust/issues/75453/
1446 [74820]: https://github.com/rust-lang/rust/issues/74820/
1447 [74420]: https://github.com/rust-lang/rust/issues/74420/
1448 [74109]: https://github.com/rust-lang/rust/pull/74109/
1449 [74150]: https://github.com/rust-lang/rust/pull/74150/
1450 [73862]: https://github.com/rust-lang/rust/pull/73862/
1451 [73887]: https://github.com/rust-lang/rust/pull/73887/
1452 [73466]: https://github.com/rust-lang/rust/pull/73466/
1453 [73516]: https://github.com/rust-lang/rust/pull/73516/
1454 [73293]: https://github.com/rust-lang/rust/pull/73293/
1455 [73007]: https://github.com/rust-lang/rust/pull/73007/
1456 [73032]: https://github.com/rust-lang/rust/pull/73032/
1457 [72920]: https://github.com/rust-lang/rust/pull/72920/
1458 [72569]: https://github.com/rust-lang/rust/pull/72569/
1459 [72583]: https://github.com/rust-lang/rust/pull/72583/
1460 [72584]: https://github.com/rust-lang/rust/pull/72584/
1461 [72717]: https://github.com/rust-lang/rust/pull/72717/
1462 [72437]: https://github.com/rust-lang/rust/pull/72437/
1463 [72445]: https://github.com/rust-lang/rust/pull/72445/
1464 [72486]: https://github.com/rust-lang/rust/pull/72486/
1465 [72493]: https://github.com/rust-lang/rust/pull/72493/
1466 [72331]: https://github.com/rust-lang/rust/pull/72331/
1467 [71896]: https://github.com/rust-lang/rust/pull/71896/
1468 [71660]: https://github.com/rust-lang/rust/pull/71660/
1469 [71322]: https://github.com/rust-lang/rust/pull/71322/
1470 [70740]: https://github.com/rust-lang/rust/pull/70740/
1471 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1472 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1473 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1474 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1475 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1478 Version 1.45.2 (2020-08-03)
1479 ==========================
1481 * [Fix bindings in tuple struct patterns][74954]
1482 * [Fix track_caller integration with trait objects][74784]
1484 [74954]: https://github.com/rust-lang/rust/issues/74954
1485 [74784]: https://github.com/rust-lang/rust/issues/74784
1488 Version 1.45.1 (2020-07-30)
1489 ==========================
1491 * [Fix const propagation with references.][73613]
1492 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1493 * [Avoid spurious implicit region bound.][74509]
1494 * [Install clippy on x.py install][74457]
1496 [73613]: https://github.com/rust-lang/rust/pull/73613
1497 [73078]: https://github.com/rust-lang/rust/issues/73078
1498 [74509]: https://github.com/rust-lang/rust/pull/74509
1499 [74457]: https://github.com/rust-lang/rust/pull/74457
1502 Version 1.45.0 (2020-07-16)
1503 ==========================
1507 - [Out of range float to int conversions using `as` has been defined as a saturating
1508 conversion.][71269] This was previously undefined behaviour, but you can use the
1509 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1510 may be desirable in rare performance sensitive situations.
1511 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1512 using `u64`.][70705]
1513 - [Function like procedural macros can now be used in expression, pattern, and statement
1514 positions.][68717] This means you can now use a function-like procedural macro
1515 anywhere you can use a declarative (`macro_rules!`) macro.
1519 - [You can now override individual target features through the `target-feature`
1520 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1521 equivalent to `-C target-feature=+avx2,+fma`.
1522 - [Added the `force-unwind-tables` flag.][69984] This option allows
1523 rustc to always generate unwind tables regardless of panic strategy.
1524 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1525 to include LLVM bitcode into generated `rlib`s (this is on by default).
1526 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1527 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1528 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1529 - [Upgraded to LLVM 10.][67759]
1531 \* Refer to Rust's [platform support page][platform-support-doc] for more
1532 information on Rust's tiered platform support.
1537 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1539 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1540 - [You can now use `char` with
1541 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1542 a range of codepoints.][72413] E.g.
1543 you can now write the following;
1545 for ch in 'a'..='z' {
1549 // Prints "abcdefghijklmnopqrstuvwxyz"
1551 - [`OsString` now implements `FromStr`.][71662]
1552 - [The `saturating_neg` method has been added to all signed integer primitive
1553 types, and the `saturating_abs` method has been added for all integer
1554 primitive types.][71886]
1555 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1556 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1558 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1559 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1560 integer types.][69813]
1561 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1562 integer types.][72324]
1563 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1568 - [`BTreeMap::remove_entry`]
1570 - [`rc::Weak::as_ptr`]
1571 - [`rc::Weak::from_raw`]
1572 - [`rc::Weak::into_raw`]
1573 - [`str::strip_prefix`]
1574 - [`str::strip_suffix`]
1575 - [`sync::Weak::as_ptr`]
1576 - [`sync::Weak::from_raw`]
1577 - [`sync::Weak::into_raw`]
1578 - [`char::UNICODE_VERSION`]
1579 - [`Span::resolved_at`]
1580 - [`Span::located_at`]
1581 - [`Span::mixed_site`]
1582 - [`unix::process::CommandExt::arg0`]
1587 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1592 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1593 `~~outdated information~~` becomes "~~outdated information~~".
1594 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1598 - [Trying to self initialize a static value (that is creating a value using
1599 itself) is unsound and now causes a compile error.][71140]
1600 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1601 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1602 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1603 previously undocumented and not intended for public use. Rustdoc still provides
1604 a non-zero exit code on errors.
1605 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1606 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1607 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1608 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1609 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1613 - [Make clippy a git subtree instead of a git submodule][70655]
1614 - [Unify the undo log of all snapshot types][69464]
1616 [71848]: https://github.com/rust-lang/rust/issues/71848/
1617 [73420]: https://github.com/rust-lang/rust/issues/73420/
1618 [72324]: https://github.com/rust-lang/rust/pull/72324/
1619 [71843]: https://github.com/rust-lang/rust/pull/71843/
1620 [71886]: https://github.com/rust-lang/rust/pull/71886/
1621 [72234]: https://github.com/rust-lang/rust/pull/72234/
1622 [72239]: https://github.com/rust-lang/rust/pull/72239/
1623 [72397]: https://github.com/rust-lang/rust/pull/72397/
1624 [72413]: https://github.com/rust-lang/rust/pull/72413/
1625 [72014]: https://github.com/rust-lang/rust/pull/72014/
1626 [72062]: https://github.com/rust-lang/rust/pull/72062/
1627 [72094]: https://github.com/rust-lang/rust/pull/72094/
1628 [72133]: https://github.com/rust-lang/rust/pull/72133/
1629 [67759]: https://github.com/rust-lang/rust/pull/67759/
1630 [71900]: https://github.com/rust-lang/rust/pull/71900/
1631 [71928]: https://github.com/rust-lang/rust/pull/71928/
1632 [71662]: https://github.com/rust-lang/rust/pull/71662/
1633 [71716]: https://github.com/rust-lang/rust/pull/71716/
1634 [71447]: https://github.com/rust-lang/rust/pull/71447/
1635 [71269]: https://github.com/rust-lang/rust/pull/71269/
1636 [71095]: https://github.com/rust-lang/rust/pull/71095/
1637 [71140]: https://github.com/rust-lang/rust/pull/71140/
1638 [70655]: https://github.com/rust-lang/rust/pull/70655/
1639 [70705]: https://github.com/rust-lang/rust/pull/70705/
1640 [69984]: https://github.com/rust-lang/rust/pull/69984/
1641 [69813]: https://github.com/rust-lang/rust/pull/69813/
1642 [69464]: https://github.com/rust-lang/rust/pull/69464/
1643 [68717]: https://github.com/rust-lang/rust/pull/68717/
1644 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1645 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1646 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1647 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1648 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1649 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1650 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1651 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1652 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1653 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1654 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1655 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1656 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1657 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1658 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1659 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1660 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1663 Version 1.44.1 (2020-06-18)
1664 ===========================
1666 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1667 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1668 * [Fix crashes when finding backtrace on macOS.][71397]
1669 * [Clippy applies lint levels into different files.][clippy/5356]
1671 [71397]: https://github.com/rust-lang/rust/issues/71397
1672 [73078]: https://github.com/rust-lang/rust/issues/73078
1673 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1674 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1677 Version 1.44.0 (2020-06-04)
1678 ==========================
1682 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1683 - [Added the `unused_braces` lint.][70081]
1685 **Syntax-only changes**
1687 - [Expansion-driven outline module parsing][69838]
1692 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1697 These are still rejected semantically, so you will likely receive an error but
1698 these changes can be seen and parsed by macros and conditional compilation.
1702 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1703 Additionally when in incremental mode rustc defaults to 256 codegen units.
1704 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1705 a panic is thrown.][67502]
1706 - [Added tier 3\* support for the `aarch64-unknown-none` and
1707 `aarch64-unknown-none-softfloat` targets.][68334]
1708 - [Added tier 3 support for `arm64-apple-tvos` and
1709 `x86_64-apple-tvos` targets.][68191]
1714 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1715 `vec![]` to be able to be used in `const` contexts.
1716 - [`convert::Infallible` now implements `Hash`.][70281]
1717 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1718 a `&mut OsStr`.][70048]
1719 - [Unicode 13 is now supported.][69929]
1720 - [`String` now implements `From<&mut str>`.][69661]
1721 - [`IoSlice` now implements `Copy`.][69403]
1722 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1723 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1724 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1725 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1726 integer types.][69373]
1730 - [`PathBuf::with_capacity`]
1731 - [`PathBuf::capacity`]
1732 - [`PathBuf::clear`]
1733 - [`PathBuf::reserve`]
1734 - [`PathBuf::reserve_exact`]
1735 - [`PathBuf::shrink_to_fit`]
1736 - [`f32::to_int_unchecked`]
1737 - [`f64::to_int_unchecked`]
1738 - [`Layout::align_to`]
1739 - [`Layout::pad_to_align`]
1741 - [`Layout::extend`]
1745 - [Added the `cargo tree` command which will print a tree graph of
1746 your dependencies.][cargo/8062] E.g.
1748 mdbook v0.3.2 (/Users/src/rust/mdbook)
1750 │ ├── html5ever v0.24.0
1752 │ │ │ └── cfg-if v0.1.9
1754 │ │ └── markup5ever v0.9.0
1755 │ │ ├── log v0.4.8 (*)
1757 │ │ │ └── phf_shared v0.7.24
1758 │ │ │ ├── siphasher v0.2.3
1759 │ │ │ └── unicase v1.4.2
1760 │ │ │ [build-dependencies]
1761 │ │ │ └── version_check v0.1.5
1764 You can also display dependencies on multiple versions of the same crate with
1765 `cargo tree -d` (short for `cargo tree --duplicates`).
1769 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1770 the version in the sidebar.][69494]
1774 - [Rustc now correctly generates static libraries on Windows GNU targets with
1775 the `.a` extension, rather than the previous `.lib`.][70937]
1776 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1777 - [The `file_name` property in JSON output of macro errors now points the actual
1778 source file rather than the previous format of `<NAME macros>`.][70969]
1779 **Note:** this may not point to a file that actually exists on the user's system.
1780 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1781 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1782 not allow zero initialization such as `NonZeroU8`.][66059] This was
1783 previously a warning.
1784 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1785 operator has been defined as a saturating operation.][71269] This was previously
1786 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1787 continue using the current behaviour, which may be desirable in rare performance
1788 sensitive situations.
1792 These changes provide no direct user facing benefits, but represent significant
1793 improvements to the internals and overall performance of rustc and
1796 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1797 - [Replace big JS dict with JSON parsing.][71250]
1799 [69373]: https://github.com/rust-lang/rust/pull/69373/
1800 [66059]: https://github.com/rust-lang/rust/pull/66059/
1801 [68191]: https://github.com/rust-lang/rust/pull/68191/
1802 [68899]: https://github.com/rust-lang/rust/pull/68899/
1803 [71147]: https://github.com/rust-lang/rust/pull/71147/
1804 [71250]: https://github.com/rust-lang/rust/pull/71250/
1805 [70937]: https://github.com/rust-lang/rust/pull/70937/
1806 [70969]: https://github.com/rust-lang/rust/pull/70969/
1807 [70632]: https://github.com/rust-lang/rust/pull/70632/
1808 [70281]: https://github.com/rust-lang/rust/pull/70281/
1809 [70345]: https://github.com/rust-lang/rust/pull/70345/
1810 [70048]: https://github.com/rust-lang/rust/pull/70048/
1811 [70081]: https://github.com/rust-lang/rust/pull/70081/
1812 [70156]: https://github.com/rust-lang/rust/pull/70156/
1813 [71269]: https://github.com/rust-lang/rust/pull/71269/
1814 [69838]: https://github.com/rust-lang/rust/pull/69838/
1815 [69929]: https://github.com/rust-lang/rust/pull/69929/
1816 [69661]: https://github.com/rust-lang/rust/pull/69661/
1817 [69778]: https://github.com/rust-lang/rust/pull/69778/
1818 [69494]: https://github.com/rust-lang/rust/pull/69494/
1819 [69403]: https://github.com/rust-lang/rust/pull/69403/
1820 [69033]: https://github.com/rust-lang/rust/pull/69033/
1821 [68692]: https://github.com/rust-lang/rust/pull/68692/
1822 [68334]: https://github.com/rust-lang/rust/pull/68334/
1823 [67502]: https://github.com/rust-lang/rust/pull/67502/
1824 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1825 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1826 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1827 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1828 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1829 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1830 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1831 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1832 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1833 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1834 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1835 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1836 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1839 Version 1.43.1 (2020-05-07)
1840 ===========================
1842 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1843 * [Fixed the stabilization of AVX-512 features.][71473]
1844 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1846 [71430]: https://github.com/rust-lang/rust/pull/71430
1847 [71473]: https://github.com/rust-lang/rust/issues/71473
1848 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1851 Version 1.43.0 (2020-04-23)
1852 ==========================
1856 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1857 the type inferred correctly.][68129]
1858 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1860 **Syntax only changes**
1861 - [Allow `type Foo: Ord` syntactically.][69361]
1862 - [Fuse associated and extern items up to defaultness.][69194]
1863 - [Syntactically allow `self` in all `fn` contexts.][68764]
1864 - [Merge `fn` syntax + cleanup item parsing.][68728]
1865 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1866 For example, you may now write:
1868 macro_rules! mac_trait {
1878 These are still rejected *semantically*, so you will likely receive an error but
1879 these changes can be seen and parsed by macros and
1880 conditional compilation.
1885 - [You can now pass multiple lint flags to rustc to override the previous
1886 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1887 everything in the `unused` lint group except `unused-variables` which
1888 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1889 everything in the `unused` lint group **including** `unused-variables` since
1890 the allow flag is specified before the deny flag (and therefore overridden).
1891 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1892 if they are available on `windows-gnu`.][67429]
1893 - [rustc now buffers errors/warnings printed in JSON.][69227]
1897 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1898 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1899 respectively.][69538] **Note** These conversions are only available when `N`
1901 - [You can now use associated constants on floats and integers directly, rather
1902 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1903 `f32::NAN` with no imports.
1904 - [`u8::is_ascii` is now `const`.][68984]
1905 - [`String` now implements `AsMut<str>`.][68742]
1906 - [Added the `primitive` module to `std` and `core`.][67637] This module
1907 reexports Rust's primitive types. This is mainly useful in macros
1908 where you want avoid these types being shadowed.
1909 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1910 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1914 - [`Once::is_completed`]
1919 - [`iter::once_with`]
1923 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1924 your environment.][cargo/7823]
1925 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1926 executable path when running integration tests or benchmarks.][cargo/7697]
1927 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1928 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1932 - [Certain checks in the `const_err` lint were deemed unrelated to const
1933 evaluation][69185], and have been moved to the `unconditional_panic` and
1934 `arithmetic_overflow` lints.
1939 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1940 has been a warning since 1.36.0.
1941 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1942 led to some instances being accepted, and now correctly emits a hard error.
1944 [69340]: https://github.com/rust-lang/rust/pull/69340
1948 These changes provide no direct user facing benefits, but represent significant
1949 improvements to the internals and overall performance of `rustc` and
1952 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1953 - [Improved how rustc generates drop code.][67332]
1954 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1955 - [traits: preallocate 2 Vecs of known initial size][69022]
1956 - [Avoid exponential behaviour when relating types][68772]
1957 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1958 - [Improve performance of coherence checks][68966]
1959 - [Deduplicate types in the generator witness][68672]
1960 - [Invert control in struct_lint_level.][68725]
1962 [67332]: https://github.com/rust-lang/rust/pull/67332/
1963 [67429]: https://github.com/rust-lang/rust/pull/67429/
1964 [67637]: https://github.com/rust-lang/rust/pull/67637/
1965 [67642]: https://github.com/rust-lang/rust/pull/67642/
1966 [67878]: https://github.com/rust-lang/rust/pull/67878/
1967 [67885]: https://github.com/rust-lang/rust/pull/67885/
1968 [68129]: https://github.com/rust-lang/rust/pull/68129/
1969 [68672]: https://github.com/rust-lang/rust/pull/68672/
1970 [68725]: https://github.com/rust-lang/rust/pull/68725/
1971 [68728]: https://github.com/rust-lang/rust/pull/68728/
1972 [68738]: https://github.com/rust-lang/rust/pull/68738/
1973 [68742]: https://github.com/rust-lang/rust/pull/68742/
1974 [68764]: https://github.com/rust-lang/rust/pull/68764/
1975 [68772]: https://github.com/rust-lang/rust/pull/68772/
1976 [68943]: https://github.com/rust-lang/rust/pull/68943/
1977 [68952]: https://github.com/rust-lang/rust/pull/68952/
1978 [68966]: https://github.com/rust-lang/rust/pull/68966/
1979 [68984]: https://github.com/rust-lang/rust/pull/68984/
1980 [69022]: https://github.com/rust-lang/rust/pull/69022/
1981 [69185]: https://github.com/rust-lang/rust/pull/69185/
1982 [69194]: https://github.com/rust-lang/rust/pull/69194/
1983 [69201]: https://github.com/rust-lang/rust/pull/69201/
1984 [69227]: https://github.com/rust-lang/rust/pull/69227/
1985 [69548]: https://github.com/rust-lang/rust/pull/69548/
1986 [69256]: https://github.com/rust-lang/rust/pull/69256/
1987 [69361]: https://github.com/rust-lang/rust/pull/69361/
1988 [69366]: https://github.com/rust-lang/rust/pull/69366/
1989 [69538]: https://github.com/rust-lang/rust/pull/69538/
1990 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1991 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1992 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1993 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1994 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1995 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1996 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1997 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2000 Version 1.42.0 (2020-03-12)
2001 ==========================
2005 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2007 fn foo(words: &[&str]) {
2009 ["Hello", "World", "!", ..] => println!("Hello World!"),
2010 ["Foo", "Bar", ..] => println!("Baz"),
2011 rest => println!("{:?}", rest),
2015 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2016 that you can create an enum that has the exact layout and ABI of the type
2018 - [You can now use outer attribute procedural macros on inline modules.][64273]
2019 - [There are some *syntax-only* changes:][67131]
2020 - `default` is syntactically allowed before items in `trait` definitions.
2021 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2022 leave out their bodies in favor of `;`.
2023 - Bounds on associated types in `impl`s are now syntactically allowed
2024 (e.g. `type Foo: Ord;`).
2025 - `...` (the C-variadic type) may occur syntactically directly as the type of
2026 any function parameter.
2028 These are still rejected *semantically*, so you will likely receive an error
2029 but these changes can be seen and parsed by procedural macros and
2030 conditional compilation.
2034 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2035 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2036 - [`Option::{expect,unwrap}` and
2037 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2038 pointing to the location where they were called, rather than
2039 `core`'s internals. ][67887]
2041 \* Refer to Rust's [platform support page][platform-support-doc] for more
2042 information on Rust's tiered platform support.
2046 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2047 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2048 to implement `Sized`.][67935]
2049 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2050 - [`Layout::new` is now `const`.][66254]
2051 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2056 - [`CondVar::wait_while`]
2057 - [`CondVar::wait_timeout_while`]
2059 - [`DebugMap::value`]
2060 - [`ManuallyDrop::take`]
2062 - [`ptr::slice_from_raw_parts_mut`]
2063 - [`ptr::slice_from_raw_parts`]
2067 - [You no longer need to include `extern crate proc_macro;` to be able to
2068 `use proc_macro;` in the `2018` edition.][cargo/7700]
2072 - [`Error::description` has been deprecated, and its use will now produce a
2073 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2075 [68253]: https://github.com/rust-lang/rust/pull/68253/
2076 [68348]: https://github.com/rust-lang/rust/pull/68348/
2077 [67935]: https://github.com/rust-lang/rust/pull/67935/
2078 [68339]: https://github.com/rust-lang/rust/pull/68339/
2079 [68122]: https://github.com/rust-lang/rust/pull/68122/
2080 [64273]: https://github.com/rust-lang/rust/pull/64273/
2081 [67712]: https://github.com/rust-lang/rust/pull/67712/
2082 [67887]: https://github.com/rust-lang/rust/pull/67887/
2083 [67131]: https://github.com/rust-lang/rust/pull/67131/
2084 [67233]: https://github.com/rust-lang/rust/pull/67233/
2085 [66899]: https://github.com/rust-lang/rust/pull/66899/
2086 [66919]: https://github.com/rust-lang/rust/pull/66919/
2087 [66254]: https://github.com/rust-lang/rust/pull/66254/
2088 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2089 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2090 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2091 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2092 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2093 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2094 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2095 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2096 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2099 Version 1.41.1 (2020-02-27)
2100 ===========================
2102 * [Always check types of static items][69145]
2103 * [Always check lifetime bounds of `Copy` impls][69145]
2104 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2106 [69225]: https://github.com/rust-lang/rust/issues/69225
2107 [69145]: https://github.com/rust-lang/rust/pull/69145
2110 Version 1.41.0 (2020-01-30)
2111 ===========================
2116 - [You can now pass type parameters to foreign items when implementing
2117 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2118 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2119 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2120 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2121 - [You can now use any valid identifier in a `format_args` macro.][66847]
2122 Previously identifiers starting with an underscore were not allowed.
2123 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2124 enum variants.][66183] These are still rejected semantically, but
2125 can be seen and parsed by procedural macros and conditional compilation.
2130 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2131 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2132 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2133 - [You can now pass an arguments file passing the `@path` syntax
2134 to rustc.][66172] Note that the format differs somewhat from what is
2135 found in other tooling; please see [the documentation][argfile-docs] for
2137 - [You can now provide `--extern` flag without a path, indicating that it is
2138 available from the search path or specified with an `-L` flag.][64882]
2140 \* Refer to Rust's [platform support page][platform-support-doc] for more
2141 information on Rust's tiered platform support.
2143 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2148 - [The `core::panic` module is now stable.][66771] It was already stable
2150 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2151 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2152 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2157 - [`Result::map_or`]
2158 - [`Result::map_or_else`]
2159 - [`std::rc::Weak::weak_count`]
2160 - [`std::rc::Weak::strong_count`]
2161 - [`std::sync::Weak::weak_count`]
2162 - [`std::sync::Weak::strong_count`]
2167 - [Cargo will now document all the private items for binary crates
2168 by default.][cargo/7593]
2169 - [`cargo-install` will now reinstall the package if it detects that it is out
2170 of date.][cargo/7560]
2171 - [Cargo.lock now uses a more git friendly format that should help to reduce
2172 merge conflicts.][cargo/7579]
2173 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2174 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2175 optimisation level to `2` for debug builds. You can also use
2176 `[profile.<profile>.build-override]` to override build scripts and
2182 - [You can now specify `edition` in documentation code blocks to compile the block
2183 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2184 should be compiled the 2018 edition of Rust.
2185 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2186 current theme with `--check-theme`.][54733]
2187 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2192 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2193 Apple targets.][apple-32bit-drop] This means that the source code is still
2194 available to build, but the targets are no longer being tested and release
2195 binaries for those platforms will no longer be distributed by the Rust project.
2196 Please refer to the linked blog post for more information.
2198 [54733]: https://github.com/rust-lang/rust/pull/54733/
2199 [61351]: https://github.com/rust-lang/rust/pull/61351/
2200 [67255]: https://github.com/rust-lang/rust/pull/67255/
2201 [66661]: https://github.com/rust-lang/rust/pull/66661/
2202 [66771]: https://github.com/rust-lang/rust/pull/66771/
2203 [66847]: https://github.com/rust-lang/rust/pull/66847/
2204 [66238]: https://github.com/rust-lang/rust/pull/66238/
2205 [66277]: https://github.com/rust-lang/rust/pull/66277/
2206 [66325]: https://github.com/rust-lang/rust/pull/66325/
2207 [66172]: https://github.com/rust-lang/rust/pull/66172/
2208 [66183]: https://github.com/rust-lang/rust/pull/66183/
2209 [65879]: https://github.com/rust-lang/rust/pull/65879/
2210 [65013]: https://github.com/rust-lang/rust/pull/65013/
2211 [64882]: https://github.com/rust-lang/rust/pull/64882/
2212 [64325]: https://github.com/rust-lang/rust/pull/64325/
2213 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2214 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2215 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2216 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2217 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2218 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2219 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2220 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2221 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2222 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2223 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2225 Version 1.40.0 (2019-12-19)
2226 ===========================
2230 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2231 `const` contexts.][65188] e.g.
2234 pub struct Point(i32, i32);
2236 const ORIGIN: Point = {
2237 let constructor = Point;
2243 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2244 indicate that there may be variants or fields added in the future.][64639]
2245 For example this requires adding a wild-card branch (`_ => {}`) to any match
2246 statements on a non-exhaustive `enum`. [(RFC 2008)]
2247 - [You can now use function-like procedural macros in `extern` blocks and in
2248 type positions.][63931] e.g. `type Generated = macro!();`
2249 - [Function-like and attribute procedural macros can now emit
2250 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2251 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2252 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2253 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2257 - [Added tier 3 support\* for the
2258 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2259 - [Added tier 3 support for the
2260 `aarch64-unknown-none-softfloat` target.][64589]
2261 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2262 `mips64el-unknown-linux-muslabi64` targets.][65843]
2264 \* Refer to Rust's [platform support page][platform-support-doc] for more
2265 information on Rust's tiered platform support.
2269 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2273 - [`BTreeMap::get_key_value`]
2274 - [`HashMap::get_key_value`]
2275 - [`Option::as_deref_mut`]
2276 - [`Option::as_deref`]
2277 - [`Option::flatten`]
2278 - [`UdpSocket::peer_addr`]
2279 - [`f32::to_be_bytes`]
2280 - [`f32::to_le_bytes`]
2281 - [`f32::to_ne_bytes`]
2282 - [`f64::to_be_bytes`]
2283 - [`f64::to_le_bytes`]
2284 - [`f64::to_ne_bytes`]
2285 - [`f32::from_be_bytes`]
2286 - [`f32::from_le_bytes`]
2287 - [`f32::from_ne_bytes`]
2288 - [`f64::from_be_bytes`]
2289 - [`f64::from_le_bytes`]
2290 - [`f64::from_ne_bytes`]
2297 - [Cargo will now always display warnings, rather than only on
2298 fresh builds.][cargo/7450]
2299 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2300 now produce an error.][cargo/7507] Previously these flags were ignored.
2301 - [You can now publish `dev-dependencies` without including
2302 a `version`.][cargo/7333]
2306 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2307 when running documentation tests with `rustdoc`.][63803]
2311 - [As previously announced, any previous NLL warnings in the 2015 edition are
2312 now hard errors.][64221]
2313 - [The `include!` macro will now warn if it failed to include the
2314 entire file.][64284] The `include!` macro unintentionally only includes the
2315 first _expression_ in a file, and this can be unintuitive. This will become
2316 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2317 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2318 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2319 or `extern` blocks now correctly emits a hard error.
2321 [65294]: https://github.com/rust-lang/rust/pull/65294/
2322 [66103]: https://github.com/rust-lang/rust/pull/66103/
2323 [65843]: https://github.com/rust-lang/rust/pull/65843/
2324 [65188]: https://github.com/rust-lang/rust/pull/65188/
2325 [65092]: https://github.com/rust-lang/rust/pull/65092/
2326 [64589]: https://github.com/rust-lang/rust/pull/64589/
2327 [64639]: https://github.com/rust-lang/rust/pull/64639/
2328 [64221]: https://github.com/rust-lang/rust/pull/64221/
2329 [64284]: https://github.com/rust-lang/rust/pull/64284/
2330 [63931]: https://github.com/rust-lang/rust/pull/63931/
2331 [64035]: https://github.com/rust-lang/rust/pull/64035/
2332 [63674]: https://github.com/rust-lang/rust/pull/63674/
2333 [63803]: https://github.com/rust-lang/rust/pull/63803/
2334 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2335 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2336 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2337 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2338 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2339 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2340 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2341 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2342 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2343 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2344 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2345 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2346 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2347 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2348 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2349 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2350 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2351 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2352 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2353 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2354 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2355 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2356 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2357 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2358 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2359 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2362 Version 1.39.0 (2019-11-07)
2363 ===========================
2367 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2368 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2369 - [You can now use certain attributes on function, closure, and function pointer
2370 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2371 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2372 attributes applied to items. e.g.
2375 #[cfg(windows)] slice: &[u16],
2376 #[cfg(not(windows))] slice: &[u8],
2381 - [You can now take shared references to bind-by-move patterns in the `if` guards
2382 of `match` arms.][63118] e.g.
2385 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2389 // ---- `nums` is bound by move.
2390 if nums.iter().sum::<u8>() == 10
2391 // ^------ `.iter()` implicitly takes a reference to `nums`.
2394 // ----------- Legal as `nums` was bound by move and so we have ownership.
2396 _ => unreachable!(),
2405 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2406 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2407 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2408 **Note** Cargo currently doesn't use this feature. Refer to
2409 [cargo#7315][cargo/7315] to track this feature's progress.
2410 - [You can now pass `--show-output` argument to test binaries to print the
2411 output of successful tests.][62600]
2414 \* Refer to Rust's [platform support page][platform-support-doc] for more
2415 information on Rust's tiered platform support.
2419 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2420 - [`LinkedList::new` is now a `const` function.][63684]
2421 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2422 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2423 now `const`.][63786]
2427 - [`Pin::into_inner`]
2428 - [`Instant::checked_duration_since`]
2429 - [`Instant::saturating_duration_since`]
2433 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2434 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2435 `--all` is now deprecated.
2439 - [You can now pass `-Clinker` to rustdoc to control the linker used
2440 for compiling doctests.][63834]
2444 - [Code that was previously accepted by the old borrow checker, but rejected by
2445 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2446 previously a warning, and will also become a hard error in the Rust 2015
2447 edition in the 1.40.0 release.
2448 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2449 run tests.][63827] This should improve performance when running a large
2451 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2452 recommended to use the `?` operator instead.
2453 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2456 [62600]: https://github.com/rust-lang/rust/pull/62600/
2457 [62672]: https://github.com/rust-lang/rust/pull/62672/
2458 [63118]: https://github.com/rust-lang/rust/pull/63118/
2459 [63209]: https://github.com/rust-lang/rust/pull/63209/
2460 [63402]: https://github.com/rust-lang/rust/pull/63402/
2461 [63565]: https://github.com/rust-lang/rust/pull/63565/
2462 [63595]: https://github.com/rust-lang/rust/pull/63595/
2463 [63684]: https://github.com/rust-lang/rust/pull/63684/
2464 [63698]: https://github.com/rust-lang/rust/pull/63698/
2465 [63770]: https://github.com/rust-lang/rust/pull/63770/
2466 [63786]: https://github.com/rust-lang/rust/pull/63786/
2467 [63827]: https://github.com/rust-lang/rust/pull/63827/
2468 [63834]: https://github.com/rust-lang/rust/pull/63834/
2469 [63927]: https://github.com/rust-lang/rust/pull/63927/
2470 [63933]: https://github.com/rust-lang/rust/pull/63933/
2471 [63934]: https://github.com/rust-lang/rust/pull/63934/
2472 [63938]: https://github.com/rust-lang/rust/pull/63938/
2473 [63940]: https://github.com/rust-lang/rust/pull/63940/
2474 [63941]: https://github.com/rust-lang/rust/pull/63941/
2475 [63945]: https://github.com/rust-lang/rust/pull/63945/
2476 [64010]: https://github.com/rust-lang/rust/pull/64010/
2477 [64028]: https://github.com/rust-lang/rust/pull/64028/
2478 [64334]: https://github.com/rust-lang/rust/pull/64334/
2479 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2480 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2481 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2482 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2483 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2484 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2486 Version 1.38.0 (2019-09-26)
2487 ==========================
2491 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2492 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2496 - [Added pipelined compilation support to `rustc`.][62766] This will
2497 improve compilation times in some cases. For further information please refer
2498 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2499 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2500 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2501 `x86_64-uwp-windows-msvc` targets.][60260]
2502 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2503 `armv7-unknown-linux-musleabi` targets.][63107]
2504 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2505 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2506 - [Upgraded to LLVM 9.][62592]
2508 \* Refer to Rust's [platform support page][platform-support-doc] for more
2509 information on Rust's tiered platform support.
2513 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2514 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2515 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2516 is available at `std::clone::Clone`). This also makes all built-in macros
2517 available in `std`/`core` root. e.g. `std::include_bytes!`.
2518 - [`str::Chars` now implements `Debug`.][63000]
2519 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2520 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2521 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2522 - [Added euclidean remainder and division operations (`div_euclid`,
2523 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2524 `overflowing`, and `wrapping` versions are available for all
2526 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2527 `PartialEq`.][61491]
2528 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2532 - [`<*const T>::cast`]
2533 - [`<*mut T>::cast`]
2534 - [`Duration::as_secs_f32`]
2535 - [`Duration::as_secs_f64`]
2536 - [`Duration::div_f32`]
2537 - [`Duration::div_f64`]
2538 - [`Duration::from_secs_f32`]
2539 - [`Duration::from_secs_f64`]
2540 - [`Duration::mul_f32`]
2541 - [`Duration::mul_f64`]
2542 - [`any::type_name`]
2546 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2547 - [You can now pass the `--features` option multiple times to enable
2548 multiple features.][cargo/7084]
2553 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2557 - [`rustc` will now warn about some incorrect uses of
2558 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2562 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2564 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2565 issues][62896] with certain crates such as libc.
2567 [60260]: https://github.com/rust-lang/rust/pull/60260/
2568 [61457]: https://github.com/rust-lang/rust/pull/61457/
2569 [61491]: https://github.com/rust-lang/rust/pull/61491/
2570 [61884]: https://github.com/rust-lang/rust/pull/61884/
2571 [61953]: https://github.com/rust-lang/rust/pull/61953/
2572 [62042]: https://github.com/rust-lang/rust/pull/62042/
2573 [62528]: https://github.com/rust-lang/rust/pull/62528/
2574 [62583]: https://github.com/rust-lang/rust/pull/62583/
2575 [62735]: https://github.com/rust-lang/rust/pull/62735/
2576 [62766]: https://github.com/rust-lang/rust/pull/62766/
2577 [62784]: https://github.com/rust-lang/rust/pull/62784/
2578 [62592]: https://github.com/rust-lang/rust/pull/62592/
2579 [62785]: https://github.com/rust-lang/rust/issues/62785/
2580 [62814]: https://github.com/rust-lang/rust/pull/62814/
2581 [62896]: https://github.com/rust-lang/rust/issues/62896/
2582 [63000]: https://github.com/rust-lang/rust/pull/63000/
2583 [63056]: https://github.com/rust-lang/rust/pull/63056/
2584 [63107]: https://github.com/rust-lang/rust/pull/63107/
2585 [63346]: https://github.com/rust-lang/rust/pull/63346/
2586 [63421]: https://github.com/rust-lang/rust/pull/63421/
2587 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2588 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2589 [63048]: https://github.com/rust-lang/rust/pull/63048
2590 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2591 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2592 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2593 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2594 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2595 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2596 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2597 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2598 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2599 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2600 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2601 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2602 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2604 Version 1.37.0 (2019-08-15)
2605 ==========================
2609 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2610 [`Box`][62228], or an [array][62235] and unused.
2611 - [You can now use the `cfg` and `cfg_attr` attributes on
2612 generic parameters.][61547]
2613 - [You can now use enum variants through type alias.][61682] e.g. You can
2614 write the following:
2616 type MyOption = Option<u8>;
2618 fn increment_or_zero(x: MyOption) -> u8 {
2620 MyOption::Some(y) => y + 1,
2621 MyOption::None => 0,
2625 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2626 `const _: u32 = 5;`.
2627 - [You can now use `#[repr(align(X)]` on enums.][61229]
2628 - [The `?` Kleene macro operator is now available in the
2629 2015 edition.][60932]
2633 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2634 and `-C profile-use` flags.][61268] For more information on how to use profile
2635 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2636 - [The `rust-lldb` wrapper script should now work again.][61827]
2640 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2644 - [`BufReader::buffer`]
2645 - [`BufWriter::buffer`]
2646 - [`Cell::from_mut`]
2647 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2648 - [`DoubleEndedIterator::nth_back`]
2650 - [`Wrapping::reverse_bits`]
2651 - [`i128::reverse_bits`]
2652 - [`i16::reverse_bits`]
2653 - [`i32::reverse_bits`]
2654 - [`i64::reverse_bits`]
2655 - [`i8::reverse_bits`]
2656 - [`isize::reverse_bits`]
2657 - [`slice::copy_within`]
2658 - [`u128::reverse_bits`]
2659 - [`u16::reverse_bits`]
2660 - [`u32::reverse_bits`]
2661 - [`u64::reverse_bits`]
2662 - [`u8::reverse_bits`]
2663 - [`usize::reverse_bits`]
2667 - [`Cargo.lock` files are now included by default when publishing executable crates
2668 with executables.][cargo/7026]
2669 - [You can now specify `default-run="foo"` in `[package]` to specify the
2670 default executable to use for `cargo run`.][cargo/7056]
2677 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2678 Please transition your code to using the `..=` syntax for inclusive
2680 - [Using a trait object without the `dyn` will now warn by default.][61203]
2681 Please transition your code to use `dyn Trait` for trait objects instead.
2683 [62228]: https://github.com/rust-lang/rust/pull/62228/
2684 [62235]: https://github.com/rust-lang/rust/pull/62235/
2685 [61802]: https://github.com/rust-lang/rust/pull/61802/
2686 [61827]: https://github.com/rust-lang/rust/pull/61827/
2687 [61547]: https://github.com/rust-lang/rust/pull/61547/
2688 [61682]: https://github.com/rust-lang/rust/pull/61682/
2689 [61268]: https://github.com/rust-lang/rust/pull/61268/
2690 [61342]: https://github.com/rust-lang/rust/pull/61342/
2691 [61347]: https://github.com/rust-lang/rust/pull/61347/
2692 [61100]: https://github.com/rust-lang/rust/pull/61100/
2693 [61203]: https://github.com/rust-lang/rust/pull/61203/
2694 [61229]: https://github.com/rust-lang/rust/pull/61229/
2695 [60932]: https://github.com/rust-lang/rust/pull/60932/
2696 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2697 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2698 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2699 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2700 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2701 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2702 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2703 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2704 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2705 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2706 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2707 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2708 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2709 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2710 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2711 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2712 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2713 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2714 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2715 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2716 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2717 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2718 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2719 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2722 Version 1.36.0 (2019-07-04)
2723 ==========================
2727 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2728 - [The order of traits in trait objects no longer affects the semantics of that
2729 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2730 `dyn fmt::Debug + Send`, where this was previously not the case.
2734 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2735 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2736 - [`mem::needs_drop` is now available as a const fn.][60364]
2737 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2738 - [`String` now implements `BorrowMut<str>`.][60404]
2739 - [`io::Cursor` now implements `Default`.][60234]
2740 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2741 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2742 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2743 environment has access to heap memory allocation.
2744 - [`String` now implements `From<&String>`.][59825]
2745 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2746 return a tuple of each argument when there is multiple arguments.
2747 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2752 - [`VecDeque::rotate_left`]
2753 - [`VecDeque::rotate_right`]
2754 - [`Iterator::copied`]
2756 - [`io::IoSliceMut`]
2757 - [`Read::read_vectored`]
2758 - [`Write::write_vectored`]
2759 - [`str::as_mut_ptr`]
2760 - [`mem::MaybeUninit`]
2761 - [`pointer::align_offset`]
2762 - [`future::Future`]
2764 - [`task::RawWaker`]
2765 - [`task::RawWakerVTable`]
2771 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2772 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2774 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2778 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2785 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2786 longer recommended, and will be deprecated in 1.39.0.
2788 [60318]: https://github.com/rust-lang/rust/pull/60318/
2789 [60364]: https://github.com/rust-lang/rust/pull/60364/
2790 [60370]: https://github.com/rust-lang/rust/pull/60370/
2791 [60404]: https://github.com/rust-lang/rust/pull/60404/
2792 [60234]: https://github.com/rust-lang/rust/pull/60234/
2793 [60244]: https://github.com/rust-lang/rust/pull/60244/
2794 [58623]: https://github.com/rust-lang/rust/pull/58623/
2795 [59648]: https://github.com/rust-lang/rust/pull/59648/
2796 [59675]: https://github.com/rust-lang/rust/pull/59675/
2797 [59825]: https://github.com/rust-lang/rust/pull/59825/
2798 [59826]: https://github.com/rust-lang/rust/pull/59826/
2799 [59445]: https://github.com/rust-lang/rust/pull/59445/
2800 [59114]: https://github.com/rust-lang/rust/pull/59114/
2801 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2802 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2803 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2804 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2805 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2806 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2807 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2808 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2809 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2810 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2811 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2812 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2813 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2814 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2815 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2816 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2817 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2818 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2819 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2820 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2823 Version 1.35.0 (2019-05-23)
2824 ==========================
2828 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2829 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2830 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2832 unsafe fn call_unsafe(func: unsafe fn()) {
2837 unsafe { call_unsafe(|| {}); }
2844 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2845 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2846 - [Added the `wasm32-unknown-wasi` target.][59464]
2851 - [`Thread` will now show its ID in `Debug` output.][59460]
2852 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2853 - [`alloc::System` now implements `Default`.][59451]
2854 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2856 - [`char::{ToLowercase, ToUppercase}` now
2857 implement `ExactSizeIterator`.][58778]
2858 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2859 - [Removed the `Read` trait bounds
2860 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2861 - [You can now call the `dbg!` macro without any parameters to print the file
2862 and line where it is called.][57847]
2863 - [In place ASCII case conversions are now up to 4× faster.][59283]
2864 e.g. `str::make_ascii_lowercase`
2865 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2872 - [`RefCell::replace_with`]
2873 - [`RefCell::map_split`]
2875 - [`Range::contains`]
2876 - [`RangeFrom::contains`]
2877 - [`RangeTo::contains`]
2878 - [`RangeInclusive::contains`]
2879 - [`RangeToInclusive::contains`]
2880 - [`Option::copied`]
2884 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2885 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2890 - [The Rust toolchain is now available natively for musl based distros.][58575]
2892 [59460]: https://github.com/rust-lang/rust/pull/59460/
2893 [59464]: https://github.com/rust-lang/rust/pull/59464/
2894 [59500]: https://github.com/rust-lang/rust/pull/59500/
2895 [59512]: https://github.com/rust-lang/rust/pull/59512/
2896 [59580]: https://github.com/rust-lang/rust/pull/59580/
2897 [59283]: https://github.com/rust-lang/rust/pull/59283/
2898 [59451]: https://github.com/rust-lang/rust/pull/59451/
2899 [59076]: https://github.com/rust-lang/rust/pull/59076/
2900 [58778]: https://github.com/rust-lang/rust/pull/58778/
2901 [58717]: https://github.com/rust-lang/rust/pull/58717/
2902 [58369]: https://github.com/rust-lang/rust/pull/58369/
2903 [58423]: https://github.com/rust-lang/rust/pull/58423/
2904 [58080]: https://github.com/rust-lang/rust/pull/58080/
2905 [57847]: https://github.com/rust-lang/rust/pull/57847/
2906 [58575]: https://github.com/rust-lang/rust/pull/58575
2907 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2908 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2909 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2910 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2911 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2912 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2913 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2914 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2915 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2916 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2917 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2918 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2920 Version 1.34.2 (2019-05-14)
2921 ===========================
2923 * [Destabilize the `Error::type_id` function due to a security
2924 vulnerability][60785] ([CVE-2019-12083])
2926 [60785]: https://github.com/rust-lang/rust/pull/60785
2927 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2929 Version 1.34.1 (2019-04-25)
2930 ===========================
2932 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2933 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2934 * [Fix Clippy panic when checking some macros][clippy/3805]
2936 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2937 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2938 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2940 Version 1.34.0 (2019-04-11)
2941 ==========================
2945 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2946 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2948 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2949 `#[attr{}]` procedural macros.][57367]
2950 - [You can now write `extern crate self as foo;`][57407] to import your
2951 crate's root into the extern prelude.
2956 - [You can now target `riscv64imac-unknown-none-elf` and
2957 `riscv64gc-unknown-none-elf`.][58406]
2958 - [You can now enable linker plugin LTO optimisations with
2959 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2960 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2962 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2967 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2968 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2969 the `Hash` trait to create an iterator.
2970 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2971 methods.][58421] Most notably you no longer require the `Ord` trait to create
2973 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2974 for all numeric types.][58044]
2975 - [Indexing a `str` is now generic over all types that
2976 implement `SliceIndex<str>`.][57604]
2977 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2978 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2979 produce a warning if their returning type is unused.
2980 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2981 `overflowing_pow` are now available for all numeric types.][57873] These are
2982 equivalent to methods such as `wrapping_add` for the `pow` operation.
2990 * [`Error::type_id`]
2991 * [`atomic::AtomicI16`]
2992 * [`atomic::AtomicI32`]
2993 * [`atomic::AtomicI64`]
2994 * [`atomic::AtomicI8`]
2995 * [`atomic::AtomicU16`]
2996 * [`atomic::AtomicU32`]
2997 * [`atomic::AtomicU64`]
2998 * [`atomic::AtomicU8`]
2999 * [`convert::Infallible`]
3000 * [`convert::TryFrom`]
3001 * [`convert::TryInto`]
3003 * [`iter::successors`]
3004 * [`num::NonZeroI128`]
3005 * [`num::NonZeroI16`]
3006 * [`num::NonZeroI32`]
3007 * [`num::NonZeroI64`]
3008 * [`num::NonZeroI8`]
3009 * [`num::NonZeroIsize`]
3010 * [`slice::sort_by_cached_key`]
3011 * [`str::escape_debug`]
3012 * [`str::escape_default`]
3013 * [`str::escape_unicode`]
3014 * [`str::split_ascii_whitespace`]
3017 * [`Instant::checked_add`]
3018 * [`Instant::checked_sub`]
3019 * [`SystemTime::checked_add`]
3020 * [`SystemTime::checked_sub`]
3024 - [You can now use alternative registries to crates.io.][cargo/6654]
3028 - [You can now use the `?` operator in your documentation tests without manually
3029 adding `fn main() -> Result<(), _> {}`.][56470]
3033 - [`Command::before_exec` is being replaced by the unsafe method
3034 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3035 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3036 can now use `const` functions in `static` variables.
3038 [58370]: https://github.com/rust-lang/rust/pull/58370/
3039 [58406]: https://github.com/rust-lang/rust/pull/58406/
3040 [58421]: https://github.com/rust-lang/rust/pull/58421/
3041 [58166]: https://github.com/rust-lang/rust/pull/58166/
3042 [58044]: https://github.com/rust-lang/rust/pull/58044/
3043 [58057]: https://github.com/rust-lang/rust/pull/58057/
3044 [58059]: https://github.com/rust-lang/rust/pull/58059/
3045 [57809]: https://github.com/rust-lang/rust/pull/57809/
3046 [57873]: https://github.com/rust-lang/rust/pull/57873/
3047 [57604]: https://github.com/rust-lang/rust/pull/57604/
3048 [57367]: https://github.com/rust-lang/rust/pull/57367/
3049 [57407]: https://github.com/rust-lang/rust/pull/57407/
3050 [57425]: https://github.com/rust-lang/rust/pull/57425/
3051 [57106]: https://github.com/rust-lang/rust/pull/57106/
3052 [56470]: https://github.com/rust-lang/rust/pull/56470/
3053 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3054 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3055 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3056 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3057 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3058 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3059 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3060 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3061 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3062 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3063 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3064 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3065 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3066 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3067 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3068 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3069 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3070 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3071 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3072 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3073 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3074 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3075 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3076 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3077 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3078 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3079 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3080 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3081 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3082 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3083 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3086 Version 1.33.0 (2019-02-28)
3087 ==========================
3091 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3092 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3093 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3094 E.g. You can have match statement on a `u8` that covers `0..=255` and
3095 you would no longer be required to have a `_ => unreachable!()` case.
3096 - [You can now have multiple patterns in `if let` and `while let`
3097 expressions.][57532] You can do this with the same syntax as a `match`
3107 let state = Creature::Crab("Ferris");
3109 if let Creature::Crab(name) | Creature::Person(name) = state {
3110 println!("This creature's name is: {}", name);
3114 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3115 this feature will by default produce a warning as this behaviour can be
3116 unintuitive. E.g. `if let _ = 5 {}`
3117 - [You can now use `let` bindings, assignments, expression statements,
3118 and irrefutable pattern destructuring in const functions.][57175]
3119 - [You can now call unsafe const functions.][57067] E.g.
3121 const unsafe fn foo() -> i32 { 5 }
3122 const fn bar() -> i32 {
3126 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3127 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3128 - [You can now specify a specific alignment with the `#[repr(packed)]`
3129 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3130 with an alignment of 2 bytes and a size of 6 bytes.
3131 - [You can now import an item from a module as an `_`.][56303] This allows you to
3132 import a trait's impls, and not have the name in the namespace. E.g.
3134 use std::io::Read as _;
3136 // Allowed as there is only one `Read` in the module.
3139 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3143 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3144 command line argument.][56351]
3145 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3146 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3147 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3148 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3149 information on Rust's platform support.
3150 - [Added support for the `thumbv7neon-linux-androideabi` and
3151 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3152 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3156 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3157 functions for all numeric types.][57566]
3158 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3159 are now `const` functions for all numeric types.][57105]
3160 - [The methods `is_positive` and `is_negative` are now `const` functions for
3161 all signed numeric types.][57105]
3162 - [The `get` method for all `NonZero` types is now `const`.][57167]
3163 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3164 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3165 numeric types.][57234]
3166 - [`Ipv4Addr::new` is now a `const` function][57234]
3170 - [`unix::FileExt::read_exact_at`]
3171 - [`unix::FileExt::write_all_at`]
3172 - [`Option::transpose`]
3173 - [`Result::transpose`]
3174 - [`convert::identity`]
3177 - [`marker::PhantomPinned`]
3178 - [`Vec::resize_with`]
3179 - [`VecDeque::resize_with`]
3180 - [`Duration::as_millis`]
3181 - [`Duration::as_micros`]
3182 - [`Duration::as_nanos`]
3187 - [You can now publish crates that require a feature flag to compile with
3188 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3189 - [Cargo should now rebuild a crate if a file was modified during the initial
3194 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3195 are now deprecated in the standard library, and their usage will now produce a warning.
3196 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3198 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3200 - [Libtest no longer creates a new thread for each test when
3201 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3203 [55982]: https://github.com/rust-lang/rust/pull/55982/
3204 [56243]: https://github.com/rust-lang/rust/pull/56243
3205 [56303]: https://github.com/rust-lang/rust/pull/56303/
3206 [56351]: https://github.com/rust-lang/rust/pull/56351/
3207 [56362]: https://github.com/rust-lang/rust/pull/56362
3208 [56642]: https://github.com/rust-lang/rust/pull/56642/
3209 [56769]: https://github.com/rust-lang/rust/pull/56769/
3210 [56805]: https://github.com/rust-lang/rust/pull/56805
3211 [56947]: https://github.com/rust-lang/rust/pull/56947/
3212 [57049]: https://github.com/rust-lang/rust/pull/57049/
3213 [57067]: https://github.com/rust-lang/rust/pull/57067/
3214 [57105]: https://github.com/rust-lang/rust/pull/57105
3215 [57130]: https://github.com/rust-lang/rust/pull/57130/
3216 [57167]: https://github.com/rust-lang/rust/pull/57167/
3217 [57175]: https://github.com/rust-lang/rust/pull/57175/
3218 [57234]: https://github.com/rust-lang/rust/pull/57234/
3219 [57332]: https://github.com/rust-lang/rust/pull/57332/
3220 [57465]: https://github.com/rust-lang/rust/pull/57465/
3221 [57532]: https://github.com/rust-lang/rust/pull/57532/
3222 [57535]: https://github.com/rust-lang/rust/pull/57535/
3223 [57566]: https://github.com/rust-lang/rust/pull/57566/
3224 [57615]: https://github.com/rust-lang/rust/pull/57615/
3225 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3226 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3227 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3228 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3229 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3230 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3231 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3232 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3233 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3234 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3235 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3236 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3237 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3238 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3239 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3240 [platform-support]: https://forge.rust-lang.org/platform-support.html
3242 Version 1.32.0 (2019-01-17)
3243 ==========================
3248 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3249 operator allows you to specify zero or one repetitions similar to the `*` and
3251 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3252 now always resolve to the item (`enum`, `struct`, etc.) available in the
3253 module if present, before resolving to a external crate or an item the prelude.][56759]
3256 enum Color { Red, Green, Blue }
3262 - [You can now match against `PhantomData<T>` types.][55837]
3263 - [You can now match against literals in macros with the `literal`
3264 specifier.][56072] This will match against a literal of any type.
3265 E.g. `1`, `'A'`, `"Hello World"`
3266 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3268 struct Point(i32, i32);
3271 pub fn new(x: i32, y: i32) -> Self {
3275 pub fn is_origin(&self) -> bool {
3283 - [Self can also now be used in type definitions.][56366] E.g.
3287 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3290 Cons(T, Box<Self>) // likewise here
3293 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3294 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3298 - [The default allocator has changed from jemalloc to the default allocator on
3299 your system.][55238] The compiler itself on Linux & macOS will still use
3300 jemalloc, but programs compiled with it will use the system allocator.
3301 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3305 - [`PathBuf` now implements `FromStr`.][55148]
3306 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3307 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3308 easily debug expressions in your rust program. E.g.
3311 let b = dbg!(a * 2) + 1;
3312 // ^-- prints: [src/main.rs:4] a * 2 = 4
3316 The following APIs are now `const` functions and can be used in a
3320 - [`UnsafeCell::get`]
3321 - [`char::is_ascii`]
3323 - [`ManuallyDrop::new`]
3324 - [`ManuallyDrop::into_inner`]
3325 - [`RangeInclusive::start`]
3326 - [`RangeInclusive::end`]
3327 - [`NonNull::as_ptr`]
3330 - [`Duration::as_secs`]
3331 - [`Duration::subsec_millis`]
3332 - [`Duration::subsec_micros`]
3333 - [`Duration::subsec_nanos`]
3335 - [`Ipv4Addr::is_unspecified`]
3337 - [`Ipv6Addr::octets`]
3341 - [`i8::to_be_bytes`]
3342 - [`i8::to_le_bytes`]
3343 - [`i8::to_ne_bytes`]
3344 - [`i8::from_be_bytes`]
3345 - [`i8::from_le_bytes`]
3346 - [`i8::from_ne_bytes`]
3347 - [`i16::to_be_bytes`]
3348 - [`i16::to_le_bytes`]
3349 - [`i16::to_ne_bytes`]
3350 - [`i16::from_be_bytes`]
3351 - [`i16::from_le_bytes`]
3352 - [`i16::from_ne_bytes`]
3353 - [`i32::to_be_bytes`]
3354 - [`i32::to_le_bytes`]
3355 - [`i32::to_ne_bytes`]
3356 - [`i32::from_be_bytes`]
3357 - [`i32::from_le_bytes`]
3358 - [`i32::from_ne_bytes`]
3359 - [`i64::to_be_bytes`]
3360 - [`i64::to_le_bytes`]
3361 - [`i64::to_ne_bytes`]
3362 - [`i64::from_be_bytes`]
3363 - [`i64::from_le_bytes`]
3364 - [`i64::from_ne_bytes`]
3365 - [`i128::to_be_bytes`]
3366 - [`i128::to_le_bytes`]
3367 - [`i128::to_ne_bytes`]
3368 - [`i128::from_be_bytes`]
3369 - [`i128::from_le_bytes`]
3370 - [`i128::from_ne_bytes`]
3371 - [`isize::to_be_bytes`]
3372 - [`isize::to_le_bytes`]
3373 - [`isize::to_ne_bytes`]
3374 - [`isize::from_be_bytes`]
3375 - [`isize::from_le_bytes`]
3376 - [`isize::from_ne_bytes`]
3377 - [`u8::to_be_bytes`]
3378 - [`u8::to_le_bytes`]
3379 - [`u8::to_ne_bytes`]
3380 - [`u8::from_be_bytes`]
3381 - [`u8::from_le_bytes`]
3382 - [`u8::from_ne_bytes`]
3383 - [`u16::to_be_bytes`]
3384 - [`u16::to_le_bytes`]
3385 - [`u16::to_ne_bytes`]
3386 - [`u16::from_be_bytes`]
3387 - [`u16::from_le_bytes`]
3388 - [`u16::from_ne_bytes`]
3389 - [`u32::to_be_bytes`]
3390 - [`u32::to_le_bytes`]
3391 - [`u32::to_ne_bytes`]
3392 - [`u32::from_be_bytes`]
3393 - [`u32::from_le_bytes`]
3394 - [`u32::from_ne_bytes`]
3395 - [`u64::to_be_bytes`]
3396 - [`u64::to_le_bytes`]
3397 - [`u64::to_ne_bytes`]
3398 - [`u64::from_be_bytes`]
3399 - [`u64::from_le_bytes`]
3400 - [`u64::from_ne_bytes`]
3401 - [`u128::to_be_bytes`]
3402 - [`u128::to_le_bytes`]
3403 - [`u128::to_ne_bytes`]
3404 - [`u128::from_be_bytes`]
3405 - [`u128::from_le_bytes`]
3406 - [`u128::from_ne_bytes`]
3407 - [`usize::to_be_bytes`]
3408 - [`usize::to_le_bytes`]
3409 - [`usize::to_ne_bytes`]
3410 - [`usize::from_be_bytes`]
3411 - [`usize::from_le_bytes`]
3412 - [`usize::from_ne_bytes`]
3416 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3417 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3421 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3425 - [The argument types for AVX's
3426 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3427 been changed from `*const` to `*mut` as the previous implementation
3431 [55148]: https://github.com/rust-lang/rust/pull/55148/
3432 [55238]: https://github.com/rust-lang/rust/pull/55238/
3433 [55280]: https://github.com/rust-lang/rust/pull/55280/
3434 [55610]: https://github.com/rust-lang/rust/pull/55610/
3435 [55663]: https://github.com/rust-lang/rust/pull/55663/
3436 [55702]: https://github.com/rust-lang/rust/pull/55702/
3437 [55837]: https://github.com/rust-lang/rust/pull/55837/
3438 [55843]: https://github.com/rust-lang/rust/pull/55843/
3439 [56072]: https://github.com/rust-lang/rust/pull/56072/
3440 [56245]: https://github.com/rust-lang/rust/pull/56245/
3441 [56365]: https://github.com/rust-lang/rust/pull/56365/
3442 [56366]: https://github.com/rust-lang/rust/pull/56366/
3443 [56395]: https://github.com/rust-lang/rust/pull/56395/
3444 [56759]: https://github.com/rust-lang/rust/pull/56759/
3445 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3446 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3447 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3448 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3449 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3450 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3451 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3452 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3453 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3454 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3455 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3456 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3457 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3458 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3459 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3460 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3461 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3462 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3463 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3464 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3465 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3466 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3467 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3468 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3469 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3470 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3471 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3472 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3473 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3474 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3475 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3476 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3477 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3478 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3479 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3480 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3481 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3482 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3483 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3484 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3485 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3486 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3487 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3488 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3489 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3490 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3491 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3492 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3493 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3494 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3495 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3496 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3497 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3498 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3499 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3500 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3501 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3502 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3503 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3504 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3505 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3506 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3507 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3508 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3509 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3510 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3511 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3512 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3513 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3514 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3515 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3516 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3517 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3518 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3519 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3520 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3521 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3522 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3523 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3524 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3525 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3526 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3527 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3528 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3529 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3530 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3531 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3532 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3533 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3534 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3535 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3536 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3537 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3540 Version 1.31.1 (2018-12-20)
3541 ===========================
3543 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3544 - [Fix broken go-to-definition in RLS][rls/1171]
3545 - [Fix infinite loop on hover in RLS][rls/1170]
3547 [56562]: https://github.com/rust-lang/rust/pull/56562
3548 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3549 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3551 Version 1.31.0 (2018-12-06)
3552 ==========================
3556 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3557 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3558 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3559 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3561 - [You can now define and use `const` functions.][54835] These are currently
3562 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3563 [language reference][const-reference] for what exactly is available.
3564 - [You can now use tool lints, which allow you to scope lints from external
3565 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3566 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3567 a crate, not just in exported functions.][54451]
3568 - [You can now use parentheses in pattern matches.][54497]
3572 - [Updated musl to 1.1.20][54430]
3576 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3577 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3578 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3579 into `Option<&mut T>` using the `From` trait.][53218]
3580 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3585 - [`slice::align_to`]
3586 - [`slice::align_to_mut`]
3587 - [`slice::chunks_exact`]
3588 - [`slice::chunks_exact_mut`]
3589 - [`slice::rchunks`]
3590 - [`slice::rchunks_mut`]
3591 - [`slice::rchunks_exact`]
3592 - [`slice::rchunks_exact_mut`]
3593 - [`Option::replace`]
3597 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3598 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3599 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3601 [52813]: https://github.com/rust-lang/rust/pull/52813/
3602 [53218]: https://github.com/rust-lang/rust/pull/53218/
3603 [53555]: https://github.com/rust-lang/rust/issues/53555/
3604 [54057]: https://github.com/rust-lang/rust/pull/54057/
3605 [54240]: https://github.com/rust-lang/rust/pull/54240/
3606 [54430]: https://github.com/rust-lang/rust/pull/54430/
3607 [54451]: https://github.com/rust-lang/rust/pull/54451/
3608 [54497]: https://github.com/rust-lang/rust/pull/54497/
3609 [54778]: https://github.com/rust-lang/rust/pull/54778/
3610 [54835]: https://github.com/rust-lang/rust/pull/54835/
3611 [54870]: https://github.com/rust-lang/rust/pull/54870/
3612 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3613 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3614 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3615 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3616 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3617 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3618 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3619 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3620 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3621 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3622 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3623 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3624 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3625 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3627 Version 1.30.1 (2018-11-08)
3628 ===========================
3630 - [Fixed overflow ICE in rustdoc][54199]
3631 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3633 [54199]: https://github.com/rust-lang/rust/pull/54199
3634 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3636 Version 1.30.0 (2018-10-25)
3637 ==========================
3641 - [Procedural macros are now available.][52081] These kinds of macros allow for
3642 more powerful code generation. There is a [new chapter available][proc-macros]
3643 in the Rust Programming Language book that goes further in depth.
3644 - [You can now use keywords as identifiers using the raw identifiers
3645 syntax (`r#`),][53236] e.g. `let r#for = true;`
3646 - [Using anonymous parameters in traits is now deprecated with a warning and
3647 will be a hard error in the 2018 edition.][53272]
3648 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3649 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3650 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3651 Previously, using a external crate in a module without a use statement
3652 required `let json = ::serde_json::from_str(foo);` but can now be written
3653 as `let json = serde_json::from_str(foo);`.
3654 - [You can now apply the `#[used]` attribute to static items to prevent the
3655 compiler from optimising them away, even if they appear to be unused,][51363]
3656 e.g. `#[used] static FOO: u32 = 1;`
3657 - [You can now import and reexport macros from other crates with the `use`
3658 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3659 the root module of the crate. If your macro relies on calling other local
3660 macros, it is recommended to export with the
3661 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3663 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3664 using the `vis` specifier.][53370]
3665 - [Non-macro attributes now allow all forms of literals, not just
3666 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3667 write `#[attr(true)]`.
3668 - [You can now specify a function to handle a panic in the Rust runtime with the
3669 `#[panic_handler]` attribute.][51366]
3673 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3674 - [Added the `aarch64-unknown-netbsd` target][53165]
3675 - [Upgraded to LLVM 8.][53611]
3679 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3683 - [`Ipv4Addr::BROADCAST`]
3684 - [`Ipv4Addr::LOCALHOST`]
3685 - [`Ipv4Addr::UNSPECIFIED`]
3686 - [`Ipv6Addr::LOCALHOST`]
3687 - [`Ipv6Addr::UNSPECIFIED`]
3688 - [`Iterator::find_map`]
3690 The following methods are replacement methods for `trim_left`, `trim_right`,
3691 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3693 - [`str::trim_end_matches`]
3695 - [`str::trim_start_matches`]
3696 - [`str::trim_start`]
3700 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3701 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3702 equivalent to calling `rustdoc --error-format=json`.
3703 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3707 - [`rustdoc` allows you to specify what edition to treat your code as with the
3708 `--edition` option.][54057]
3709 - [`rustdoc` now has the `--color` (specify whether to output color) and
3710 `--error-format` (specify error format, e.g. `json`) options.][53003]
3711 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3712 debug symbols.][53774]
3713 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3714 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3716 [50911]: https://github.com/rust-lang/rust/pull/50911/
3717 [51363]: https://github.com/rust-lang/rust/pull/51363/
3718 [51366]: https://github.com/rust-lang/rust/pull/51366/
3719 [52081]: https://github.com/rust-lang/rust/pull/52081/
3720 [53003]: https://github.com/rust-lang/rust/pull/53003/
3721 [53033]: https://github.com/rust-lang/rust/pull/53033/
3722 [53044]: https://github.com/rust-lang/rust/pull/53044/
3723 [53165]: https://github.com/rust-lang/rust/pull/53165/
3724 [53611]: https://github.com/rust-lang/rust/pull/53611/
3725 [53213]: https://github.com/rust-lang/rust/pull/53213/
3726 [53236]: https://github.com/rust-lang/rust/pull/53236/
3727 [53272]: https://github.com/rust-lang/rust/pull/53272/
3728 [53370]: https://github.com/rust-lang/rust/pull/53370/
3729 [53459]: https://github.com/rust-lang/rust/pull/53459/
3730 [53774]: https://github.com/rust-lang/rust/pull/53774/
3731 [53822]: https://github.com/rust-lang/rust/pull/53822/
3732 [54057]: https://github.com/rust-lang/rust/pull/54057/
3733 [54146]: https://github.com/rust-lang/rust/pull/54146/
3734 [54404]: https://github.com/rust-lang/rust/pull/54404/
3735 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3736 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3737 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3738 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3740 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3741 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3742 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3743 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3744 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3745 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3746 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3747 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3748 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3749 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3752 Version 1.29.2 (2018-10-11)
3753 ===========================
3755 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3756 - The `rls-preview` component on the windows-gnu targets has been restored.
3758 [54639]: https://github.com/rust-lang/rust/pull/54639
3761 Version 1.29.1 (2018-09-25)
3762 ===========================
3767 - The standard library's `str::repeat` function contained an out of bounds write
3768 caused by an integer overflow. This has been fixed by deterministically
3769 panicking when an overflow happens.
3771 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3775 Version 1.29.0 (2018-09-13)
3776 ==========================
3780 - [Bumped minimum LLVM version to 5.0.][51899]
3781 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3782 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3783 - [Upgraded to LLVM 7.][51966]
3787 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3788 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3789 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3790 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3792 - [`Cell<T>` now allows `T` to be unsized.][50494]
3793 - [`SocketAddr` is now stable on Redox.][52656]
3798 - [`Iterator::flatten`]
3803 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3804 `--locked` to disable this behavior.
3805 - [`cargo-install` will now allow you to cross compile an install
3806 using `--target`.][cargo/5614]
3807 - [Added the `cargo-fix` subcommand to automatically move project code from
3808 2015 edition to 2018.][cargo/5723]
3809 - [`cargo doc` can now optionally document private types using the
3810 `--document-private-items` flag.][cargo/5543]
3814 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3815 the specified level to that level.][52354] For example `--cap-lints warn`
3816 will demote `deny` and `forbid` lints to `warn`.
3817 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3818 fails and `101` if there is a panic.][52197]
3819 - [A preview of clippy has been made available through rustup.][51122]
3820 You can install the preview with `rustup component add clippy-preview`.
3824 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3825 Use `str::get_unchecked(begin..end)` instead.
3826 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3827 Consider using the `home_dir` function from
3828 https://crates.io/crates/dirs instead.
3829 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3830 - [`cfg` attributes and `--cfg` command line flags are now more
3831 strictly validated.][53893]
3833 [53893]: https://github.com/rust-lang/rust/pull/53893/
3834 [52861]: https://github.com/rust-lang/rust/pull/52861/
3835 [51966]: https://github.com/rust-lang/rust/pull/51966/
3836 [52656]: https://github.com/rust-lang/rust/pull/52656/
3837 [52239]: https://github.com/rust-lang/rust/pull/52239/
3838 [52330]: https://github.com/rust-lang/rust/pull/52330/
3839 [52354]: https://github.com/rust-lang/rust/pull/52354/
3840 [52402]: https://github.com/rust-lang/rust/pull/52402/
3841 [52103]: https://github.com/rust-lang/rust/pull/52103/
3842 [52197]: https://github.com/rust-lang/rust/pull/52197/
3843 [51807]: https://github.com/rust-lang/rust/pull/51807/
3844 [51899]: https://github.com/rust-lang/rust/pull/51899/
3845 [51912]: https://github.com/rust-lang/rust/pull/51912/
3846 [51511]: https://github.com/rust-lang/rust/pull/51511/
3847 [51619]: https://github.com/rust-lang/rust/pull/51619/
3848 [51656]: https://github.com/rust-lang/rust/pull/51656/
3849 [51178]: https://github.com/rust-lang/rust/pull/51178/
3850 [51122]: https://github.com/rust-lang/rust/pull/51122
3851 [50494]: https://github.com/rust-lang/rust/pull/50494/
3852 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3853 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3854 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3855 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3856 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3857 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3858 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3861 Version 1.28.0 (2018-08-02)
3862 ===========================
3866 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3867 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3868 the inner type across Foreign Function Interface (FFI) boundaries.
3869 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3870 and can now be used as identifiers.][51196]
3871 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3872 stable.][51241] This will allow users to specify a global allocator for
3874 - [Unit test functions marked with the `#[test]` attribute can now return
3875 `Result<(), E: Debug>` in addition to `()`.][51298]
3876 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3877 allows macros to easily target lifetimes.
3881 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3882 prioritise making smaller binary sizes. `z` is the same as `s` with the
3883 exception that it does not vectorise loops, which typically results in an even
3885 - [The short error format is now stable.][49546] Specified with
3886 `--error-format=short` this option will provide a more compressed output of
3887 rust error messages.
3888 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3889 - [Reduced the number of allocations in the macro parser.][50855] This can
3890 improve compile times of macro heavy crates on average by 5%.
3894 - [Implemented `Default` for `&mut str`.][51306]
3895 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3896 - [Implemented `Extend` for `()`.][50234]
3897 - [The `Debug` implementation of `time::Duration` should now be more easily
3898 human readable.][50364] Previously a `Duration` of one second would printed as
3899 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3900 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3901 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3902 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3903 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3904 for `PathBuf`.][50170]
3905 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3906 and `Wrapping<i128>`.][50465]
3907 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3908 possible.][51050] This can provide up to a 40% speed increase.
3909 - [Improved error messages when using `format!`.][50610]
3913 - [`Iterator::step_by`]
3914 - [`Path::ancestors`]
3915 - [`SystemTime::UNIX_EPOCH`]
3916 - [`alloc::GlobalAlloc`]
3918 - [`alloc::LayoutErr`]
3921 - [`alloc::alloc_zeroed`]
3922 - [`alloc::dealloc`]
3923 - [`alloc::realloc`]
3924 - [`alloc::handle_alloc_error`]
3925 - [`btree_map::Entry::or_default`]
3926 - [`fmt::Alignment`]
3927 - [`hash_map::Entry::or_default`]
3928 - [`iter::repeat_with`]
3929 - [`num::NonZeroUsize`]
3930 - [`num::NonZeroU128`]
3931 - [`num::NonZeroU16`]
3932 - [`num::NonZeroU32`]
3933 - [`num::NonZeroU64`]
3934 - [`num::NonZeroU8`]
3935 - [`ops::RangeBounds`]
3936 - [`slice::SliceIndex`]
3937 - [`slice::from_mut`]
3938 - [`slice::from_ref`]
3939 - [`{Any + Send + Sync}::downcast_mut`]
3940 - [`{Any + Send + Sync}::downcast_ref`]
3941 - [`{Any + Send + Sync}::is`]
3945 - [Cargo will now no longer allow you to publish crates with build scripts that
3946 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3947 considered to be immutable.
3951 - [The `suggestion_applicability` field in `rustc`'s json output is now
3952 stable.][50486] This will allow dev tools to check whether a code suggestion
3953 would apply to them.
3957 - [Rust will consider trait objects with duplicated constraints to be the same
3958 type as without the duplicated constraint.][51276] For example the below code will
3959 now fail to compile.
3964 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3967 impl Trait + Send + Send {
3968 fn test(&self) { println!("two"); }
3972 [49546]: https://github.com/rust-lang/rust/pull/49546/
3973 [50143]: https://github.com/rust-lang/rust/pull/50143/
3974 [50170]: https://github.com/rust-lang/rust/pull/50170/
3975 [50234]: https://github.com/rust-lang/rust/pull/50234/
3976 [50265]: https://github.com/rust-lang/rust/pull/50265/
3977 [50364]: https://github.com/rust-lang/rust/pull/50364/
3978 [50385]: https://github.com/rust-lang/rust/pull/50385/
3979 [50465]: https://github.com/rust-lang/rust/pull/50465/
3980 [50486]: https://github.com/rust-lang/rust/pull/50486/
3981 [50554]: https://github.com/rust-lang/rust/pull/50554/
3982 [50610]: https://github.com/rust-lang/rust/pull/50610/
3983 [50855]: https://github.com/rust-lang/rust/pull/50855/
3984 [51050]: https://github.com/rust-lang/rust/pull/51050/
3985 [51196]: https://github.com/rust-lang/rust/pull/51196/
3986 [51200]: https://github.com/rust-lang/rust/pull/51200/
3987 [51241]: https://github.com/rust-lang/rust/pull/51241/
3988 [51276]: https://github.com/rust-lang/rust/pull/51276/
3989 [51298]: https://github.com/rust-lang/rust/pull/51298/
3990 [51306]: https://github.com/rust-lang/rust/pull/51306/
3991 [51562]: https://github.com/rust-lang/rust/pull/51562/
3992 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3993 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3994 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3995 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3996 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3997 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3998 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3999 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4000 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4001 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4002 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4003 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4004 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4005 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4006 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4007 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4008 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4009 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4010 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4011 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4012 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4013 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4014 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4015 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4016 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4017 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4018 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4019 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4020 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4021 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4023 Version 1.27.2 (2018-07-20)
4024 ===========================
4029 - The borrow checker was fixed to avoid potential unsoundness when using
4030 match ergonomics: [#52213][52213].
4032 [52213]: https://github.com/rust-lang/rust/issues/52213
4034 Version 1.27.1 (2018-07-10)
4035 ===========================
4040 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4041 when running, which enabled executing code as some other user on a
4042 given machine. This release fixes that vulnerability; you can read
4043 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4045 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4050 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4051 match ergonomics: [#51415][51415], [#49534][49534].
4053 [51415]: https://github.com/rust-lang/rust/issues/51415
4054 [49534]: https://github.com/rust-lang/rust/issues/49534
4055 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4056 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4058 Version 1.27.0 (2018-06-21)
4059 ==========================
4063 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4064 be used as an identifier.
4065 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4066 bare `Trait` syntax, and should make it clearer when being used in tandem with
4067 `impl Trait` because it is equivalent to the following syntax:
4068 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4069 `Box<Trait> == Box<dyn Trait>`.
4070 - [Attributes on generic parameters such as types and lifetimes are
4071 now stable.][48851] e.g.
4072 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4073 - [The `#[must_use]` attribute can now also be used on functions as well as
4074 types.][48925] It provides a lint that by default warns users when the
4075 value returned by a function has not been used.
4079 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4083 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4084 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4085 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4086 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4087 the `cfg` attribute.
4088 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4089 std are now available in core.][49896]
4090 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4092 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4093 that the operation isn't done in place.
4094 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4095 the `#[must_use]` attribute][49533] to warn about unused potentially
4096 expensive allocations.
4100 - [`DoubleEndedIterator::rfind`]
4101 - [`DoubleEndedIterator::rfold`]
4102 - [`DoubleEndedIterator::try_rfold`]
4103 - [`Duration::from_micros`]
4104 - [`Duration::from_nanos`]
4105 - [`Duration::subsec_micros`]
4106 - [`Duration::subsec_millis`]
4107 - [`HashMap::remove_entry`]
4108 - [`Iterator::try_fold`]
4109 - [`Iterator::try_for_each`]
4111 - [`Option::filter`]
4112 - [`String::replace_range`]
4113 - [`Take::set_limit`]
4114 - [`hint::unreachable_unchecked`]
4115 - [`os::unix::process::parent_id`]
4116 - [`ptr::swap_nonoverlapping`]
4117 - [`slice::rsplit_mut`]
4119 - [`slice::swap_with_slice`]
4123 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4124 `readme`, and `repository` fields.][cargo/5386]
4125 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4126 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4127 a different directory than `target` for placing compilation artifacts.
4128 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4129 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4130 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4131 where cargo would infer a binary, Cargo will produce a warning. You can
4132 disable this feature ahead of time by setting any of the following to false:
4133 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4134 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4135 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4139 - [Added “The Rustc book” into the official documentation.][49707]
4140 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4141 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4145 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4146 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4147 compile, `"".is_empty()` will still compile.
4148 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4149 will only print the inner type.][48553] E.g.
4150 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4151 not `AtomicBool(true)`.
4152 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4153 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4154 alignment should cover all use cases.
4155 - The `.description()` method on the `std::error::Error` trait
4156 [has been soft-deprecated][50163]. It is no longer required to implement it.
4158 [48553]: https://github.com/rust-lang/rust/pull/48553/
4159 [48851]: https://github.com/rust-lang/rust/pull/48851/
4160 [48925]: https://github.com/rust-lang/rust/pull/48925/
4161 [49533]: https://github.com/rust-lang/rust/pull/49533/
4162 [49623]: https://github.com/rust-lang/rust/pull/49623/
4163 [49630]: https://github.com/rust-lang/rust/pull/49630/
4164 [49664]: https://github.com/rust-lang/rust/pull/49664/
4165 [49699]: https://github.com/rust-lang/rust/pull/49699/
4166 [49707]: https://github.com/rust-lang/rust/pull/49707/
4167 [49719]: https://github.com/rust-lang/rust/pull/49719/
4168 [49896]: https://github.com/rust-lang/rust/pull/49896/
4169 [49968]: https://github.com/rust-lang/rust/pull/49968/
4170 [50163]: https://github.com/rust-lang/rust/pull/50163
4171 [50177]: https://github.com/rust-lang/rust/pull/50177/
4172 [50378]: https://github.com/rust-lang/rust/pull/50378/
4173 [50398]: https://github.com/rust-lang/rust/pull/50398/
4174 [50423]: https://github.com/rust-lang/rust/pull/50423/
4175 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4176 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4177 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4178 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4179 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4180 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4181 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4182 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4183 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4184 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4185 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4186 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4187 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4188 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4189 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4190 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4191 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4192 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4193 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4194 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4195 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4196 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4197 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4198 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4199 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4200 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4201 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4202 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4203 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4204 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4207 Version 1.26.2 (2018-06-05)
4208 ==========================
4213 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4215 [51117]: https://github.com/rust-lang/rust/issues/51117
4218 Version 1.26.1 (2018-05-29)
4219 ==========================
4224 - [RLS now works on Windows.][50646]
4225 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4231 - [`fn main() -> impl Trait` no longer works for non-Termination
4233 This reverts an accidental stabilization.
4234 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4235 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4237 [50646]: https://github.com/rust-lang/rust/issues/50646
4238 [50656]: https://github.com/rust-lang/rust/pull/50656
4239 [50812]: https://github.com/rust-lang/rust/pull/50812
4240 [50950]: https://github.com/rust-lang/rust/issues/50950
4241 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4243 Version 1.26.0 (2018-05-10)
4244 ==========================
4248 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4249 implement either or both traits.][49299]
4250 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4251 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4252 lifetime can be elided.][49458]
4253 - [`impl Trait` is now stable allowing you to have abstract types in returns
4254 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4255 `fn open(path: impl AsRef<Path>)`.
4256 - [Pattern matching will now automatically apply dereferences.][49394]
4257 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4258 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4259 - [A lot of operations are now available in a const context.][46882] E.g. You
4260 can now index into constant arrays, reference and dereference into constants,
4261 and use tuple struct constructors.
4262 - [Fixed entry slice patterns are now stable.][48516] E.g.
4264 let points = [1, 2, 3, 4];
4266 [1, 2, 3, 4] => println!("All points were sequential."),
4267 _ => println!("Not all points were sequential."),
4274 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4275 - [Fixed exponential projection complexity on nested types.][48296]
4276 This can provide up to a ~12% reduction in compile times for certain crates.
4277 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4278 to remap path prefixes outputted by the compiler.
4279 - [Added `powerpc-unknown-netbsd` target.][48281]
4283 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4284 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4285 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4286 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4287 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4288 - [`ascii::escape_default` is now available in libcore.][48735]
4289 - [Trailing commas are now supported in std and core macros.][48056]
4290 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4291 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4296 - [`*const T::copy_to_nonoverlapping`]
4297 - [`*const T::copy_to`]
4298 - [`*const T::read_unaligned`]
4299 - [`*const T::read_volatile`]
4300 - [`*const T::read`]
4302 - [`*const T::wrapping_add`]
4303 - [`*const T::wrapping_sub`]
4305 - [`*mut T::copy_to_nonoverlapping`]
4306 - [`*mut T::copy_to`]
4307 - [`*mut T::read_unaligned`]
4308 - [`*mut T::read_volatile`]
4310 - [`*mut T::replace`]
4313 - [`*mut T::wrapping_add`]
4314 - [`*mut T::wrapping_sub`]
4315 - [`*mut T::write_bytes`]
4316 - [`*mut T::write_unaligned`]
4317 - [`*mut T::write_volatile`]
4320 - [`FromUtf8Error::as_bytes`]
4321 - [`LocalKey::try_with`]
4322 - [`Option::cloned`]
4323 - [`btree_map::Entry::and_modify`]
4324 - [`fs::read_to_string`]
4327 - [`hash_map::Entry::and_modify`]
4328 - [`iter::FusedIterator`]
4329 - [`ops::RangeInclusive`]
4330 - [`ops::RangeToInclusive`]
4332 - [`slice::rotate_left`]
4333 - [`slice::rotate_right`]
4334 - [`String::retain`]
4339 - [Cargo will now output path to custom commands when `-v` is
4340 passed with `--list`][cargo/5041]
4341 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4345 - [The second edition of "The Rust Programming Language" book is now recommended
4346 over the first.][48404]
4351 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4352 syntax is now invalid.
4354 use std::ops::Fn as dyn;
4355 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4357 - [The result of dereferences are no longer promoted to `'static`.][47408]
4361 const PAIR: &(i32, i32) = &(0, 1);
4362 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4365 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4366 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4368 - [Removed hoedown from rustdoc.][48274]
4369 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4371 [46882]: https://github.com/rust-lang/rust/pull/46882
4372 [47379]: https://github.com/rust-lang/rust/pull/47379
4373 [47408]: https://github.com/rust-lang/rust/pull/47408
4374 [47813]: https://github.com/rust-lang/rust/pull/47813
4375 [48056]: https://github.com/rust-lang/rust/pull/48056
4376 [48125]: https://github.com/rust-lang/rust/pull/48125
4377 [48166]: https://github.com/rust-lang/rust/pull/48166
4378 [48235]: https://github.com/rust-lang/rust/pull/48235
4379 [48274]: https://github.com/rust-lang/rust/pull/48274
4380 [48281]: https://github.com/rust-lang/rust/pull/48281
4381 [48296]: https://github.com/rust-lang/rust/pull/48296
4382 [48326]: https://github.com/rust-lang/rust/pull/48326
4383 [48359]: https://github.com/rust-lang/rust/pull/48359
4384 [48404]: https://github.com/rust-lang/rust/pull/48404
4385 [48481]: https://github.com/rust-lang/rust/pull/48481
4386 [48516]: https://github.com/rust-lang/rust/pull/48516
4387 [48628]: https://github.com/rust-lang/rust/pull/48628
4388 [48629]: https://github.com/rust-lang/rust/pull/48629
4389 [48657]: https://github.com/rust-lang/rust/pull/48657
4390 [48735]: https://github.com/rust-lang/rust/pull/48735
4391 [48978]: https://github.com/rust-lang/rust/pull/48978
4392 [49101]: https://github.com/rust-lang/rust/pull/49101
4393 [49109]: https://github.com/rust-lang/rust/pull/49109
4394 [49121]: https://github.com/rust-lang/rust/pull/49121
4395 [49162]: https://github.com/rust-lang/rust/pull/49162
4396 [49184]: https://github.com/rust-lang/rust/pull/49184
4397 [49234]: https://github.com/rust-lang/rust/pull/49234
4398 [49255]: https://github.com/rust-lang/rust/pull/49255
4399 [49299]: https://github.com/rust-lang/rust/pull/49299
4400 [49305]: https://github.com/rust-lang/rust/pull/49305
4401 [49394]: https://github.com/rust-lang/rust/pull/49394
4402 [49458]: https://github.com/rust-lang/rust/pull/49458
4403 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4404 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4405 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4406 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4407 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4408 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4409 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4410 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4411 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4412 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4413 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4414 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4415 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4416 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4417 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4418 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4419 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4420 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4421 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4422 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4423 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4424 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4425 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4426 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4427 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4428 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4429 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4430 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4431 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4432 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4433 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4434 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4435 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4436 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4437 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4438 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4439 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4440 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4441 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4442 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4443 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4444 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4447 Version 1.25.0 (2018-03-29)
4448 ==========================
4452 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4453 - [You can now use nested groups of imports.][47948]
4454 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4455 - [You can now have `|` at the start of a match arm.][47947] e.g.
4457 enum Foo { A, B, C }
4463 | Foo::B => println!("AB"),
4464 | Foo::C => println!("C"),
4471 - [Upgraded to LLVM 6.][47828]
4472 - [Added `-C lto=val` option.][47521]
4473 - [Added `i586-unknown-linux-musl` target][47282]
4477 - [Impl Send for `process::Command` on Unix.][47760]
4478 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4479 - [`UnsafeCell::into_inner` is now safe.][47204]
4480 - [Implement libstd for CloudABI.][47268]
4481 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4482 - [Implement `AsRef<Path>` for Component][46985]
4483 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4484 - [Moved `Duration` to libcore.][46666]
4488 - [`Location::column`]
4491 The following functions can now be used in a constant expression.
4492 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4493 - [`Duration::new`][47300]
4494 - [`Duration::from_secs`][47300]
4495 - [`Duration::from_millis`][47300]
4499 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4500 - [`cargo new` now defaults to creating a binary crate, instead of a
4501 library crate.][cargo/5029]
4505 - [Rust by example is now shipped with new releases][46196]
4509 - [Deprecated `net::lookup_host`.][47510]
4510 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4511 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4512 around indexing operations (see [#47349][47349]). This has been fixed (which also
4513 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4514 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4516 [33903]: https://github.com/rust-lang/rust/pull/33903
4517 [47947]: https://github.com/rust-lang/rust/pull/47947
4518 [47948]: https://github.com/rust-lang/rust/pull/47948
4519 [47760]: https://github.com/rust-lang/rust/pull/47760
4520 [47790]: https://github.com/rust-lang/rust/pull/47790
4521 [47828]: https://github.com/rust-lang/rust/pull/47828
4522 [47398]: https://github.com/rust-lang/rust/pull/47398
4523 [47510]: https://github.com/rust-lang/rust/pull/47510
4524 [47521]: https://github.com/rust-lang/rust/pull/47521
4525 [47204]: https://github.com/rust-lang/rust/pull/47204
4526 [47251]: https://github.com/rust-lang/rust/pull/47251
4527 [47268]: https://github.com/rust-lang/rust/pull/47268
4528 [47282]: https://github.com/rust-lang/rust/pull/47282
4529 [47300]: https://github.com/rust-lang/rust/pull/47300
4530 [47349]: https://github.com/rust-lang/rust/pull/47349
4531 [46931]: https://github.com/rust-lang/rust/pull/46931
4532 [46985]: https://github.com/rust-lang/rust/pull/46985
4533 [47006]: https://github.com/rust-lang/rust/pull/47006
4534 [46830]: https://github.com/rust-lang/rust/pull/46830
4535 [46095]: https://github.com/rust-lang/rust/pull/46095
4536 [46666]: https://github.com/rust-lang/rust/pull/46666
4537 [46196]: https://github.com/rust-lang/rust/pull/46196
4538 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4539 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4540 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4541 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4542 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4545 Version 1.24.1 (2018-03-01)
4546 ==========================
4548 - [Do not abort when unwinding through FFI][48251]
4549 - [Emit UTF-16 files for linker arguments on Windows][48318]
4550 - [Make the error index generator work again][48308]
4551 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4553 [48251]: https://github.com/rust-lang/rust/issues/48251
4554 [48308]: https://github.com/rust-lang/rust/issues/48308
4555 [48318]: https://github.com/rust-lang/rust/issues/48318
4556 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4559 Version 1.24.0 (2018-02-15)
4560 ==========================
4564 - [External `sysv64` ffi is now available.][46528]
4565 eg. `extern "sysv64" fn foo () {}`
4569 - [rustc now uses 16 codegen units by default for release builds.][46910]
4570 For the fastest builds, utilize `codegen-units=1`.
4571 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4572 - [Add `aarch64-unknown-openbsd` support][46760]
4576 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4577 improvement in performance in the majority of cases.
4578 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4579 with Windows.][46798]
4580 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4581 - [impl `From<bool>` for `AtomicBool`][46293]
4582 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4583 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4584 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4585 - [float::from_bits now just uses transmute.][46012] This provides
4586 some optimisations from LLVM.
4587 - [Copied `AsciiExt` methods onto `char`][46077]
4588 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4589 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4590 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4591 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4595 - [`RefCell::replace`]
4597 - [`atomic::spin_loop_hint`]
4599 The following functions can now be used in a constant expression.
4600 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4602 - [`AtomicBool::new`][46287]
4603 - [`AtomicUsize::new`][46287]
4604 - [`AtomicIsize::new`][46287]
4605 - [`AtomicPtr::new`][46287]
4606 - [`Cell::new`][46287]
4607 - [`{integer}::min_value`][46287]
4608 - [`{integer}::max_value`][46287]
4609 - [`mem::size_of`][46287]
4610 - [`mem::align_of`][46287]
4611 - [`ptr::null`][46287]
4612 - [`ptr::null_mut`][46287]
4613 - [`RefCell::new`][46287]
4614 - [`UnsafeCell::new`][46287]
4618 - [Added a `workspace.default-members` config that
4619 overrides implied `--all` in virtual workspaces.][cargo/4743]
4620 - [Enable incremental by default on development builds.][cargo/4817] Also added
4621 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4622 per-project or global basis respectively.
4629 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4630 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4631 in accordance with IETF RFC 4291 §2.2.
4632 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4633 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4634 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4635 - [Leading zeros in tuple struct members is now an error][47084]
4636 - [`column!()` macro is one-based instead of zero-based][46977]
4637 - [`fmt::Arguments` can no longer be shared across threads][45198]
4638 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4639 - [Cargo sets a different working directory for the compiler][cargo/4788]
4641 [44884]: https://github.com/rust-lang/rust/pull/44884
4642 [45198]: https://github.com/rust-lang/rust/pull/45198
4643 [45506]: https://github.com/rust-lang/rust/pull/45506
4644 [45904]: https://github.com/rust-lang/rust/pull/45904
4645 [45990]: https://github.com/rust-lang/rust/pull/45990
4646 [46012]: https://github.com/rust-lang/rust/pull/46012
4647 [46077]: https://github.com/rust-lang/rust/pull/46077
4648 [46094]: https://github.com/rust-lang/rust/pull/46094
4649 [46284]: https://github.com/rust-lang/rust/pull/46284
4650 [46287]: https://github.com/rust-lang/rust/pull/46287
4651 [46293]: https://github.com/rust-lang/rust/pull/46293
4652 [46528]: https://github.com/rust-lang/rust/pull/46528
4653 [46671]: https://github.com/rust-lang/rust/pull/46671
4654 [46713]: https://github.com/rust-lang/rust/pull/46713
4655 [46735]: https://github.com/rust-lang/rust/pull/46735
4656 [46749]: https://github.com/rust-lang/rust/pull/46749
4657 [46760]: https://github.com/rust-lang/rust/pull/46760
4658 [46798]: https://github.com/rust-lang/rust/pull/46798
4659 [46828]: https://github.com/rust-lang/rust/pull/46828
4660 [46831]: https://github.com/rust-lang/rust/pull/46831
4661 [46833]: https://github.com/rust-lang/rust/pull/46833
4662 [46910]: https://github.com/rust-lang/rust/pull/46910
4663 [46977]: https://github.com/rust-lang/rust/pull/46977
4664 [47018]: https://github.com/rust-lang/rust/pull/47018
4665 [47080]: https://github.com/rust-lang/rust/pull/47080
4666 [47084]: https://github.com/rust-lang/rust/pull/47084
4667 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4668 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4669 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4670 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4671 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4672 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4675 Version 1.23.0 (2018-01-04)
4676 ==========================
4680 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4681 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4682 Which should fix some confusing errors in some operations.
4686 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4687 undefined behavior.][45920]
4688 - [rustc now suggests renaming import if names clash.][45660]
4689 - [Display errors/warnings correctly when there are zero-width or
4690 wide characters.][45711]
4691 - [rustc now avoids unnecessary copies of arguments that are
4692 simple bindings][45380] This should improve memory usage on average by 5-10%.
4693 - [Updated musl used to build musl rustc to 1.1.17][45393]
4697 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4698 - [Implement Hash for raw pointers to unsized types][45483]
4699 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4700 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4701 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4702 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4703 and `<*mut T>::as_mut`][44932]
4704 - [Optimized `Thread::{park, unpark}` implementation][45524]
4705 - [Improved `SliceExt::binary_search` performance.][45333]
4706 - [impl `FromIterator<()>` for `()`][45379]
4707 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4715 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4716 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4717 - [Added unit test checking to `cargo check`][cargo/4592]
4718 - [Cargo now lets you install a specific version
4719 using `cargo install --version`][cargo/4637]
4723 - [Releases now ship with the Cargo book documentation.][45692]
4724 - [rustdoc now prints rendering warnings on every run.][45324]
4728 - [Changes have been made to type equality to make it more correct,
4729 in rare cases this could break some code.][45853] [Tracking issue for
4730 further information][45852]
4731 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4732 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4733 Android 9, the minimum supported version is Android 14.
4734 - [Bumped the minimum LLVM to 3.9][45326]
4736 [44042]: https://github.com/rust-lang/rust/pull/44042
4737 [44932]: https://github.com/rust-lang/rust/pull/44932
4738 [45267]: https://github.com/rust-lang/rust/pull/45267
4739 [45324]: https://github.com/rust-lang/rust/pull/45324
4740 [45326]: https://github.com/rust-lang/rust/pull/45326
4741 [45333]: https://github.com/rust-lang/rust/pull/45333
4742 [45379]: https://github.com/rust-lang/rust/pull/45379
4743 [45380]: https://github.com/rust-lang/rust/pull/45380
4744 [45393]: https://github.com/rust-lang/rust/pull/45393
4745 [45435]: https://github.com/rust-lang/rust/pull/45435
4746 [45483]: https://github.com/rust-lang/rust/pull/45483
4747 [45524]: https://github.com/rust-lang/rust/pull/45524
4748 [45571]: https://github.com/rust-lang/rust/pull/45571
4749 [45580]: https://github.com/rust-lang/rust/pull/45580
4750 [45610]: https://github.com/rust-lang/rust/pull/45610
4751 [45660]: https://github.com/rust-lang/rust/pull/45660
4752 [45692]: https://github.com/rust-lang/rust/pull/45692
4753 [45711]: https://github.com/rust-lang/rust/pull/45711
4754 [45772]: https://github.com/rust-lang/rust/pull/45772
4755 [45852]: https://github.com/rust-lang/rust/issues/45852
4756 [45853]: https://github.com/rust-lang/rust/pull/45853
4757 [45887]: https://github.com/rust-lang/rust/pull/45887
4758 [45920]: https://github.com/rust-lang/rust/pull/45920
4759 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4760 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4761 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4764 Version 1.22.1 (2017-11-22)
4765 ==========================
4767 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4769 [46183]: https://github.com/rust-lang/rust/pull/46183
4771 Version 1.22.0 (2017-11-22)
4772 ==========================
4776 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4777 - [Now accepts underscores in unicode escapes][43716]
4778 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4779 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4783 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4784 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4785 This should decrease compile times for debug builds.
4786 - [strict memory alignment now enabled on ARMv6][45094]
4787 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4791 - [Allow atomic operations up to 32 bits
4792 on `armv5te_unknown_linux_gnueabi`][44978]
4793 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4794 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4795 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4796 - [Properly detect overflow in `Instant += Duration`.][44220]
4797 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4798 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4799 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4806 - [Cargo will now build multi file examples in subdirectories of the `examples`
4807 folder that have a `main.rs` file.][cargo/4496]
4808 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4809 the old format will continue to work and can be updated with `cargo update`.
4810 - [Now supports vendoring git repositories][cargo/3992]
4814 - [`libbacktrace` is now available on Apple platforms.][44251]
4815 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4816 This now lets you specify that a given code example will fail to compile.
4820 - [The minimum Android version that rustc can build for has been bumped
4821 to `4.0` from `2.3`][45656]
4822 - [Allowing `T op= &T` for numeric types has broken some type
4823 inference cases][45480]
4826 [42526]: https://github.com/rust-lang/rust/pull/42526
4827 [43017]: https://github.com/rust-lang/rust/pull/43017
4828 [43716]: https://github.com/rust-lang/rust/pull/43716
4829 [43949]: https://github.com/rust-lang/rust/pull/43949
4830 [44015]: https://github.com/rust-lang/rust/pull/44015
4831 [44220]: https://github.com/rust-lang/rust/pull/44220
4832 [44251]: https://github.com/rust-lang/rust/pull/44251
4833 [44287]: https://github.com/rust-lang/rust/pull/44287
4834 [44303]: https://github.com/rust-lang/rust/pull/44303
4835 [44456]: https://github.com/rust-lang/rust/pull/44456
4836 [44466]: https://github.com/rust-lang/rust/pull/44466
4837 [44895]: https://github.com/rust-lang/rust/pull/44895
4838 [44966]: https://github.com/rust-lang/rust/pull/44966
4839 [44978]: https://github.com/rust-lang/rust/pull/44978
4840 [45041]: https://github.com/rust-lang/rust/pull/45041
4841 [45064]: https://github.com/rust-lang/rust/pull/45064
4842 [45075]: https://github.com/rust-lang/rust/pull/45075
4843 [45094]: https://github.com/rust-lang/rust/pull/45094
4844 [45095]: https://github.com/rust-lang/rust/pull/45095
4845 [45480]: https://github.com/rust-lang/rust/issues/45480
4846 [45656]: https://github.com/rust-lang/rust/pull/45656
4847 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4848 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4849 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4856 Version 1.21.0 (2017-10-12)
4857 ==========================
4861 - [You can now use static references for literals.][43838]
4865 let x: &'static u32 = &0;
4868 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4871 my_macro!(Vec<i32>::new); // Always worked
4872 my_macro!(Vec::<i32>::new); // Now works
4877 - [Upgraded jemalloc to 4.5.0][43911]
4878 - [Enabled unwinding panics on Redox][43917]
4879 - [Now runs LLVM in parallel during translation phase.][43506]
4880 This should reduce peak memory usage.
4884 - [Generate builtin impls for `Clone` for all arrays and tuples that
4885 are `T: Clone`][43690]
4886 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4887 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4888 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4893 [`std::mem::discriminant`]
4897 - [You can now call `cargo install` with multiple package names][cargo/4216]
4898 - [Cargo commands inside a virtual workspace will now implicitly
4899 pass `--all`][cargo/4335]
4900 - [Added a `[patch]` section to `Cargo.toml` to handle
4901 prepublication dependencies][cargo/4123] [RFC 1969]
4902 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4903 like patterns][cargo/4270]
4904 - [Added the `--all-targets` option][cargo/4400]
4905 - [Using required dependencies as a feature is now deprecated and emits
4906 a warning][cargo/4364]
4911 - [Cargo docs are moving][43916]
4912 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4913 - [The rustdoc book is now available][43863]
4914 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4915 - [Added a preview of RLS has been made available through rustup][44204]
4916 Install with `rustup component add rls-preview`
4917 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4918 Previously only showed `std::os::unix`.
4922 - [Changes in method matching against higher-ranked types][43880] This may cause
4923 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4924 - [rustc's JSON error output's byte position start at top of file.][42973]
4925 Was previously relative to the rustc's internal `CodeMap` struct which
4926 required the unstable library `libsyntax` to correctly use.
4927 - [`unused_results` lint no longer ignores booleans][43728]
4929 [42565]: https://github.com/rust-lang/rust/pull/42565
4930 [42973]: https://github.com/rust-lang/rust/pull/42973
4931 [43348]: https://github.com/rust-lang/rust/pull/43348
4932 [43459]: https://github.com/rust-lang/rust/pull/43459
4933 [43506]: https://github.com/rust-lang/rust/pull/43506
4934 [43540]: https://github.com/rust-lang/rust/pull/43540
4935 [43690]: https://github.com/rust-lang/rust/pull/43690
4936 [43728]: https://github.com/rust-lang/rust/pull/43728
4937 [43838]: https://github.com/rust-lang/rust/pull/43838
4938 [43863]: https://github.com/rust-lang/rust/pull/43863
4939 [43880]: https://github.com/rust-lang/rust/pull/43880
4940 [43911]: https://github.com/rust-lang/rust/pull/43911
4941 [43916]: https://github.com/rust-lang/rust/pull/43916
4942 [43917]: https://github.com/rust-lang/rust/pull/43917
4943 [44204]: https://github.com/rust-lang/rust/pull/44204
4944 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4945 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4946 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4947 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4948 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4949 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4950 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4951 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4952 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4954 Version 1.20.0 (2017-08-31)
4955 ===========================
4959 - [Associated constants are now stabilised.][42809]
4960 - [A lot of macro bugs are now fixed.][42913]
4965 - [Struct fields are now properly coerced to the expected field type.][42807]
4966 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4967 `wasm32-experimental-emscripten` target.
4968 - [Changed some of the error messages to be more helpful.][42033]
4969 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4971 - [rustc now reports the total number of errors on compilation failure][43015]
4972 previously this was only the number of errors in the pass that failed.
4973 - [Expansion in rustc has been sped up 29x.][42533]
4974 - [added `msp430-none-elf` target.][43099]
4975 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4977 - [Fixes backtraces on Redox][43228]
4978 - [rustc now identifies different versions of same crate when absolute paths of
4979 different types match in an error message.][42826]
4985 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4986 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4988 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4989 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4990 - [Impl `Clone` for `DefaultHasher`.][42799]
4991 - [Impl `Sync` for `SyncSender`.][42397]
4992 - [Impl `FromStr` for `char`][42271]
4993 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4995 - [allow messages in the `unimplemented!()` macro.][42155]
4996 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4997 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4998 - [Upgrade to Unicode 10.0.0][42999]
4999 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5000 - [Skip the main thread's manual stack guard on Linux][43072]
5001 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
5002 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5004 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5009 - [`CStr::into_c_string`]
5010 - [`CString::as_c_str`]
5011 - [`CString::into_boxed_c_str`]
5012 - [`Chain::get_mut`]
5013 - [`Chain::get_ref`]
5014 - [`Chain::into_inner`]
5015 - [`Option::get_or_insert_with`]
5016 - [`Option::get_or_insert`]
5017 - [`OsStr::into_os_string`]
5018 - [`OsString::into_boxed_os_str`]
5021 - [`Utf8Error::error_len`]
5022 - [`char::EscapeDebug`]
5023 - [`char::escape_debug`]
5024 - [`compile_error!`]
5025 - [`f32::from_bits`]
5027 - [`f64::from_bits`]
5029 - [`mem::ManuallyDrop`]
5030 - [`slice::sort_unstable_by_key`]
5031 - [`slice::sort_unstable_by`]
5032 - [`slice::sort_unstable`]
5033 - [`str::from_boxed_utf8_unchecked`]
5034 - [`str::as_bytes_mut`]
5035 - [`str::as_bytes_mut`]
5036 - [`str::from_utf8_mut`]
5037 - [`str::from_utf8_unchecked_mut`]
5039 - [`str::get_unchecked_mut`]
5040 - [`str::get_unchecked`]
5042 - [`str::into_boxed_bytes`]
5047 - [Cargo API token location moved from `~/.cargo/config` to
5048 `~/.cargo/credentials`.][cargo/3978]
5049 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5050 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5051 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5052 - [You can now specify version of a binary when installed through
5053 `cargo install` using `--vers`.][cargo/4229]
5054 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5055 failure.][cargo/4248]
5056 - [Changed the convention around which file is the crate root.][cargo/4259]
5057 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5058 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5063 - [Functions with `'static` in their return types will now not be as usable as
5064 if they were using lifetime parameters instead.][42417]
5065 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5066 takes the sign of NaN into account where previously didn't.][42430]
5068 [42033]: https://github.com/rust-lang/rust/pull/42033
5069 [42155]: https://github.com/rust-lang/rust/pull/42155
5070 [42271]: https://github.com/rust-lang/rust/pull/42271
5071 [42397]: https://github.com/rust-lang/rust/pull/42397
5072 [42417]: https://github.com/rust-lang/rust/pull/42417
5073 [42430]: https://github.com/rust-lang/rust/pull/42430
5074 [42431]: https://github.com/rust-lang/rust/pull/42431
5075 [42533]: https://github.com/rust-lang/rust/pull/42533
5076 [42571]: https://github.com/rust-lang/rust/pull/42571
5077 [42613]: https://github.com/rust-lang/rust/pull/42613
5078 [42799]: https://github.com/rust-lang/rust/pull/42799
5079 [42807]: https://github.com/rust-lang/rust/pull/42807
5080 [42809]: https://github.com/rust-lang/rust/pull/42809
5081 [42822]: https://github.com/rust-lang/rust/pull/42822
5082 [42826]: https://github.com/rust-lang/rust/pull/42826
5083 [42854]: https://github.com/rust-lang/rust/pull/42854
5084 [42913]: https://github.com/rust-lang/rust/pull/42913
5085 [42999]: https://github.com/rust-lang/rust/pull/42999
5086 [43011]: https://github.com/rust-lang/rust/pull/43011
5087 [43015]: https://github.com/rust-lang/rust/pull/43015
5088 [43072]: https://github.com/rust-lang/rust/pull/43072
5089 [43077]: https://github.com/rust-lang/rust/pull/43077
5090 [43097]: https://github.com/rust-lang/rust/pull/43097
5091 [43099]: https://github.com/rust-lang/rust/pull/43099
5092 [43170]: https://github.com/rust-lang/rust/pull/43170
5093 [43178]: https://github.com/rust-lang/rust/pull/43178
5094 [43185]: https://github.com/rust-lang/rust/pull/43185
5095 [43228]: https://github.com/rust-lang/rust/pull/43228
5096 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5097 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5098 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5099 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5100 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5101 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5102 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5103 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5104 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5105 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5106 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5107 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5108 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5109 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5110 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5111 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5112 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5113 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5114 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5115 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5116 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5117 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5118 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5119 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5120 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5121 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5122 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5123 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5124 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5125 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5126 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5127 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5128 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5129 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5130 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5131 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5132 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5133 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5134 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5137 Version 1.19.0 (2017-07-20)
5138 ===========================
5143 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5144 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5145 - [Macro recursion limit increased to 1024 from 64.][41676]
5146 - [Added lint for detecting unused macros.][41907]
5147 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5148 For example: `let x = loop { break 7; };`
5149 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5150 contain `Copy` types and cannot have a `Drop` implementation.
5151 Example: `union Foo { bar: u8, baz: usize }`
5152 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5153 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5158 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5159 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5160 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5161 you should use `--target armv7-linux-androideabi`.
5162 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5163 - [Minor optimisation of string operations.][42037]
5164 - [Compiler error message is now `aborting due to previous error(s)` instead of
5165 `aborting due to N previous errors`][42150] This was previously inaccurate and
5166 would only count certain kinds of errors.
5167 - [The compiler now supports Visual Studio 2017][42225]
5168 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5169 - [Added a lot][42264] of [new error codes][42302]
5170 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5171 libraries with C Run-time Libraries(CRT) to be statically linked.
5172 - [Fixed various ARM codegen bugs][42740]
5177 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5178 `Extend<Cow<'a, str>>`][41449]
5179 - [`Vec` now implements `From<&mut [T]>`][41530]
5180 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5181 - [`SplitWhitespace` now implements `Clone`][41659]
5182 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5184 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5185 macros, but for printing to stderr.
5190 - [`OsString::shrink_to_fit`]
5193 - [`thread::ThreadId`]
5198 - [Build scripts can now add environment variables to the environment
5199 the crate is being compiled in.
5200 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5201 - [Subcommands now replace the current process rather than spawning a new
5202 child process][cargo/3970]
5203 - [Workspace members can now accept glob file patterns][cargo/3979]
5204 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5205 the members in a given workspace.][cargo/3988]
5206 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5207 - [Target directory path is now in the cargo metadata][cargo/4022]
5208 - [Cargo no longer checks out a local working directory for the
5209 crates.io index][cargo/4026] This should provide smaller file size for the
5210 registry, and improve cloning times, especially on Windows machines.
5211 - [Added an `--exclude` option for excluding certain packages when using the
5212 `--all` option][cargo/4031]
5213 - [Cargo will now automatically retry when receiving a 5xx error
5214 from crates.io][cargo/4032]
5215 - [The `--features` option now accepts multiple comma or space
5216 delimited values.][cargo/4084]
5217 - [Added support for custom target specific runners][cargo/3954]
5222 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5224 - [Rust will now release XZ compressed packages][rust-installer/57]
5225 - [rustup will now prefer to download rust packages with
5226 XZ compression][rustup/1100] over GZip packages.
5227 - [Added the ability to escape `#` in rust documentation][41785] By adding
5228 additional `#`'s ie. `##` is now `#`
5233 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5234 - [`-Z` flags are now no longer allowed to be used on the stable
5235 compiler.][41751] This has been a warning for a year previous to this.
5236 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5237 longer works][42844]. Users should migrate to the built-in `check`
5238 command, which has been available since 1.16.
5239 - [Ending a float literal with `._` is now a hard error.
5240 Example: `42._` .][41946]
5241 - [Any use of a private `extern crate` outside of its module is now a
5242 hard error.][36886] This was previously a warning.
5243 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5244 relative while the `::` prefix makes a path absolute, but was ignored and the
5245 path was relative regardless.
5246 - [Floating point constants in match patterns is now a hard error][36890]
5247 This was previously a warning.
5248 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5249 match patterns is now a hard error][36891] This was previously a warning.
5250 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5252 - [From the pound escape, lines consisting of multiple `#`s are
5254 - [It is an error to re-export private enum variants][42460]. This is
5255 known to break a number of crates that depend on an older version of
5257 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5258 to use it to find the linker, and the build will fail where it did
5259 not previously][42607]
5261 [36886]: https://github.com/rust-lang/rust/issues/36886
5262 [36888]: https://github.com/rust-lang/rust/issues/36888
5263 [36890]: https://github.com/rust-lang/rust/issues/36890
5264 [36891]: https://github.com/rust-lang/rust/issues/36891
5265 [36892]: https://github.com/rust-lang/rust/issues/36892
5266 [37406]: https://github.com/rust-lang/rust/issues/37406
5267 [39983]: https://github.com/rust-lang/rust/pull/39983
5268 [41145]: https://github.com/rust-lang/rust/pull/41145
5269 [41192]: https://github.com/rust-lang/rust/pull/41192
5270 [41258]: https://github.com/rust-lang/rust/pull/41258
5271 [41370]: https://github.com/rust-lang/rust/pull/41370
5272 [41449]: https://github.com/rust-lang/rust/pull/41449
5273 [41530]: https://github.com/rust-lang/rust/pull/41530
5274 [41624]: https://github.com/rust-lang/rust/pull/41624
5275 [41656]: https://github.com/rust-lang/rust/pull/41656
5276 [41659]: https://github.com/rust-lang/rust/pull/41659
5277 [41676]: https://github.com/rust-lang/rust/pull/41676
5278 [41751]: https://github.com/rust-lang/rust/pull/41751
5279 [41764]: https://github.com/rust-lang/rust/pull/41764
5280 [41785]: https://github.com/rust-lang/rust/pull/41785
5281 [41873]: https://github.com/rust-lang/rust/pull/41873
5282 [41907]: https://github.com/rust-lang/rust/pull/41907
5283 [41946]: https://github.com/rust-lang/rust/pull/41946
5284 [42016]: https://github.com/rust-lang/rust/pull/42016
5285 [42037]: https://github.com/rust-lang/rust/pull/42037
5286 [42068]: https://github.com/rust-lang/rust/pull/42068
5287 [42150]: https://github.com/rust-lang/rust/pull/42150
5288 [42162]: https://github.com/rust-lang/rust/pull/42162
5289 [42225]: https://github.com/rust-lang/rust/pull/42225
5290 [42264]: https://github.com/rust-lang/rust/pull/42264
5291 [42302]: https://github.com/rust-lang/rust/pull/42302
5292 [42460]: https://github.com/rust-lang/rust/issues/42460
5293 [42607]: https://github.com/rust-lang/rust/issues/42607
5294 [42740]: https://github.com/rust-lang/rust/pull/42740
5295 [42844]: https://github.com/rust-lang/rust/issues/42844
5296 [42948]: https://github.com/rust-lang/rust/pull/42948
5297 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5298 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5299 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5300 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5301 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5302 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5303 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5304 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5305 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5306 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5307 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5308 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5309 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5310 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5311 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5312 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5313 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5314 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5315 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5316 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5317 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5318 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5321 Version 1.18.0 (2017-06-08)
5322 ===========================
5327 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5328 make the item visible to just that module tree. Also accepts the keyword
5329 `crate` to make something public to the whole crate but not users of the
5330 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5331 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5332 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5333 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5334 types like `Write + Send`, trailing `+` are now supported in trait objects,
5335 and better error reporting for trait objects starting with `?Sized`.
5336 - [0e+10 is now a valid floating point literal][40589]
5337 - [Now warns if you bind a lifetime parameter to 'static][40734]
5338 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5339 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5340 representation in some cases.][40377]
5345 - [rustc can now emit mir with `--emit mir`][39891]
5346 - [Improved LLVM IR for trivial functions][40367]
5347 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5348 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5349 opportunities found through profiling
5350 - [Improved backtrace formatting when panicking][38165]
5355 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5356 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5357 iteration or reallocation.
5358 - [Simplified HashMap Bucket interface][40561] provides performance
5359 improvements for iterating and cloning.
5360 - [Specialize Vec::from_elem to use calloc][40409]
5361 - [Fixed Race condition in fs::create_dir_all][39799]
5362 - [No longer caching stdio on Windows][40516]
5363 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5364 2.50%~ faster and in one case now 12.50% faster.
5365 - [Optimized `AtomicBool::fetch_nand`][41143]
5370 - [`Child::try_wait`]
5371 - [`HashMap::retain`]
5372 - [`HashSet::retain`]
5374 - [`TcpStream::peek`]
5375 - [`UdpSocket::peek`]
5376 - [`UdpSocket::peek_from`]
5381 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5382 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5383 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5384 - [Added Android build support][cargo/3885]
5385 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5386 of a certain type, for example `cargo build --bins` will build all
5388 - [Added support for haiku][cargo/3952]
5393 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5394 - [Added rust-windbg script for better debugging on Windows][39983]
5395 - [Rust now uses the official cross compiler for NetBSD][40612]
5396 - [rustdoc now accepts `#` at the start of files][40828]
5397 - [Fixed jemalloc support for musl][41168]
5402 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5403 always placed after the sign if it exists and before the digits. With the `#`
5404 flag the zeroes are placed after the prefix and before the digits.
5405 - [Due to the struct field optimisation][40377], using `transmute` on structs
5406 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5407 always been undefined behavior, but is now more likely to break in practice.
5408 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5409 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5410 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5411 - [Overlapping inherent `impl`s are now a hard error][40728]
5412 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5413 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5414 `out.asm` and `out.ll` instead of only one of the filetypes.
5415 - [ calling a function that returns `Self` will no longer work][41805] when
5416 the size of `Self` cannot be statically determined.
5417 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5418 this has caused a few regressions namely:
5420 - Changed the link order of local static/dynamic libraries (respecting the
5421 order on given rather than having the compiler reorder).
5422 - Changed how MinGW is linked, native code linked to dynamic libraries
5423 may require manually linking to the gcc support library (for the native
5426 [38165]: https://github.com/rust-lang/rust/pull/38165
5427 [39799]: https://github.com/rust-lang/rust/pull/39799
5428 [39891]: https://github.com/rust-lang/rust/pull/39891
5429 [39983]: https://github.com/rust-lang/rust/pull/39983
5430 [40043]: https://github.com/rust-lang/rust/pull/40043
5431 [40241]: https://github.com/rust-lang/rust/pull/40241
5432 [40338]: https://github.com/rust-lang/rust/pull/40338
5433 [40367]: https://github.com/rust-lang/rust/pull/40367
5434 [40377]: https://github.com/rust-lang/rust/pull/40377
5435 [40409]: https://github.com/rust-lang/rust/pull/40409
5436 [40516]: https://github.com/rust-lang/rust/pull/40516
5437 [40556]: https://github.com/rust-lang/rust/pull/40556
5438 [40561]: https://github.com/rust-lang/rust/pull/40561
5439 [40589]: https://github.com/rust-lang/rust/pull/40589
5440 [40612]: https://github.com/rust-lang/rust/pull/40612
5441 [40723]: https://github.com/rust-lang/rust/pull/40723
5442 [40728]: https://github.com/rust-lang/rust/pull/40728
5443 [40731]: https://github.com/rust-lang/rust/pull/40731
5444 [40734]: https://github.com/rust-lang/rust/pull/40734
5445 [40805]: https://github.com/rust-lang/rust/pull/40805
5446 [40807]: https://github.com/rust-lang/rust/pull/40807
5447 [40828]: https://github.com/rust-lang/rust/pull/40828
5448 [40870]: https://github.com/rust-lang/rust/pull/40870
5449 [41085]: https://github.com/rust-lang/rust/pull/41085
5450 [41143]: https://github.com/rust-lang/rust/pull/41143
5451 [41168]: https://github.com/rust-lang/rust/pull/41168
5452 [41270]: https://github.com/rust-lang/rust/issues/41270
5453 [41469]: https://github.com/rust-lang/rust/pull/41469
5454 [41805]: https://github.com/rust-lang/rust/issues/41805
5455 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5456 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5457 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5458 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5459 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5460 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5461 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5462 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5463 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5464 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5465 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5466 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5467 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5468 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5471 Version 1.17.0 (2017-04-27)
5472 ===========================
5477 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5478 * [Fields of structs may be initialized without duplicating the field/variable
5479 names][39761]. [RFC 1682]
5480 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5481 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5482 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5483 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5484 `'b`. Soundness fix.
5485 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5486 * [Static variables may contain references to other statics][40027]
5491 * [Exit quickly on only `--emit dep-info`][40336]
5492 * [Make `-C relocation-model` more correctly determine whether the linker
5493 creates a position-independent executable][40245]
5494 * [Add `-C overflow-checks` to directly control whether integer overflow
5496 * [The rustc type checker now checks items on demand instead of in a single
5497 in-order pass][40008]. This is mostly an internal refactoring in support of
5498 future work, including incremental type checking, but also resolves [RFC
5499 1647], allowing `Self` to appear in `impl` `where` clauses.
5500 * [Optimize vtable loads][39995]
5501 * [Turn off vectorization for Emscripten targets][39990]
5502 * [Provide suggestions for unknown macros imported with `use`][39953]
5503 * [Fix ICEs in path resolution][39939]
5504 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5505 * [Add clearer error message using `&str + &str`][39116]
5516 * [`Ordering::then`]
5517 * [`Ordering::then_with`]
5518 * [`BTreeMap::range`]
5519 * [`BTreeMap::range_mut`]
5520 * [`collections::Bound`]
5521 * [`process::abort`]
5522 * [`ptr::read_unaligned`]
5523 * [`ptr::write_unaligned`]
5524 * [`Result::expect_err`]
5527 * [`Cell::into_inner`]
5533 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5534 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5535 * [`String` implements `FromIterator<&char>`][40028]
5536 * `Box` [implements][40009] a number of new conversions:
5537 `From<Box<str>> for String`,
5538 `From<Box<[T]>> for Vec<T>`,
5539 `From<Box<CStr>> for CString`,
5540 `From<Box<OsStr>> for OsString`,
5541 `From<Box<Path>> for PathBuf`,
5542 `Into<Box<str>> for String`,
5543 `Into<Box<[T]>> for Vec<T>`,
5544 `Into<Box<CStr>> for CString`,
5545 `Into<Box<OsStr>> for OsString`,
5546 `Into<Box<Path>> for PathBuf`,
5547 `Default for Box<str>`,
5548 `Default for Box<CStr>`,
5549 `Default for Box<OsStr>`,
5550 `From<&CStr> for Box<CStr>`,
5551 `From<&OsStr> for Box<OsStr>`,
5552 `From<&Path> for Box<Path>`
5553 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5554 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5555 * [Slightly optimize `slice::sort`][39538]
5556 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5557 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5558 `Box<str>` implements `From<&str>`][39438]
5559 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5560 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5561 * [`format!` estimates the needed capacity before writing a string][39356]
5562 * [Support unprivileged symlink creation in Windows][38921]
5563 * [`PathBuf` implements `Default`][38764]
5564 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5565 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5566 and poor hash functions.
5571 * [Add `cargo check --all`][cargo/3731]
5572 * [Add an option to ignore SSL revocation checking][cargo/3699]
5573 * [Add `cargo run --package`][cargo/3691]
5574 * [Add `required_features`][cargo/3667]
5575 * [Assume `build.rs` is a build script][cargo/3664]
5576 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5581 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5583 * [The "Unstable Book" documents nightly-only features][ubook]
5584 * [Improve the style of the sidebar in rustdoc output][40265]
5585 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5586 * [Fix MSP430 breakage due to `i128`][40257]
5587 * [Preliminary Solaris/SPARCv9 support][39903]
5588 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5589 run without installing the MSVC runtime.
5590 * [`rustdoc --test` includes file names in test names][39788]
5591 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5592 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5593 * [Initial support for `aarch64-unknown-freebsd`][39491]
5594 * [Initial support for `i686-unknown-netbsd`][39426]
5595 * [This release no longer includes the old makefile build system][39431]. Rust
5596 is built with a custom build system, written in Rust, and with Cargo.
5597 * [Add Debug implementations for libcollection structs][39002]
5598 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5599 * [`--test-threads=0` produces an error][38945]
5600 * [`rustup` installs documentation by default][40526]
5601 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5602 WinDbg and Visual Studio to improve the debugging experience.
5607 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5608 workaround, either use MSVC 2015 or run vcvars.bat.
5609 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5610 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5611 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5613 * [`format!` and `Display::to_string` panic if an underlying formatting
5614 implementation returns an error][40117]. Previously the error was silently
5615 ignored. It is incorrect for `write_fmt` to return an error when writing
5617 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5618 crates were marked stable and could be accessed from the stable toolchain.
5619 * [Rust git source no longer includes vendored crates][39728]. Those that need
5620 to build with vendored crates should build from release tarballs.
5621 * [Fix inert attributes from `proc_macro_derives`][39572]
5622 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5623 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5625 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5626 existing code generally ignores the type of dead-code unless a type-hint is
5627 provided; this can cause surprising inference interactions particularly around
5628 defaulting. The new code uniformly ignores the result type of dead-code.
5629 * [Tuple-struct constructors with private fields are no longer visible][38932]
5630 * [Lifetime parameters that do not appear in the arguments are now considered
5631 early-bound][38897], resolving a soundness bug (#[32330]). The
5632 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5634 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5635 * [Make transmuting from fn item types to pointer-sized types a hard
5638 [27787]: https://github.com/rust-lang/rust/issues/27787
5639 [32330]: https://github.com/rust-lang/rust/issues/32330
5640 [34198]: https://github.com/rust-lang/rust/pull/34198
5641 [38161]: https://github.com/rust-lang/rust/pull/38161
5642 [38368]: https://github.com/rust-lang/rust/pull/38368
5643 [38584]: https://github.com/rust-lang/rust/issues/38584
5644 [38661]: https://github.com/rust-lang/rust/pull/38661
5645 [38764]: https://github.com/rust-lang/rust/pull/38764
5646 [38864]: https://github.com/rust-lang/rust/issues/38864
5647 [38897]: https://github.com/rust-lang/rust/pull/38897
5648 [38921]: https://github.com/rust-lang/rust/pull/38921
5649 [38932]: https://github.com/rust-lang/rust/pull/38932
5650 [38945]: https://github.com/rust-lang/rust/pull/38945
5651 [38981]: https://github.com/rust-lang/rust/pull/38981
5652 [39002]: https://github.com/rust-lang/rust/pull/39002
5653 [39116]: https://github.com/rust-lang/rust/pull/39116
5654 [39193]: https://github.com/rust-lang/rust/pull/39193
5655 [39265]: https://github.com/rust-lang/rust/pull/39265
5656 [39356]: https://github.com/rust-lang/rust/pull/39356
5657 [39372]: https://github.com/rust-lang/rust/pull/39372
5658 [39426]: https://github.com/rust-lang/rust/pull/39426
5659 [39431]: https://github.com/rust-lang/rust/pull/39431
5660 [39438]: https://github.com/rust-lang/rust/pull/39438
5661 [39440]: https://github.com/rust-lang/rust/pull/39440
5662 [39485]: https://github.com/rust-lang/rust/pull/39485
5663 [39491]: https://github.com/rust-lang/rust/pull/39491
5664 [39518]: https://github.com/rust-lang/rust/pull/39518
5665 [39538]: https://github.com/rust-lang/rust/pull/39538
5666 [39572]: https://github.com/rust-lang/rust/pull/39572
5667 [39633]: https://github.com/rust-lang/rust/pull/39633
5668 [39642]: https://github.com/rust-lang/rust/pull/39642
5669 [39728]: https://github.com/rust-lang/rust/pull/39728
5670 [39761]: https://github.com/rust-lang/rust/pull/39761
5671 [39788]: https://github.com/rust-lang/rust/pull/39788
5672 [39793]: https://github.com/rust-lang/rust/pull/39793
5673 [39837]: https://github.com/rust-lang/rust/pull/39837
5674 [39843]: https://github.com/rust-lang/rust/pull/39843
5675 [39851]: https://github.com/rust-lang/rust/pull/39851
5676 [39903]: https://github.com/rust-lang/rust/pull/39903
5677 [39939]: https://github.com/rust-lang/rust/pull/39939
5678 [39953]: https://github.com/rust-lang/rust/pull/39953
5679 [39960]: https://github.com/rust-lang/rust/pull/39960
5680 [39990]: https://github.com/rust-lang/rust/pull/39990
5681 [39995]: https://github.com/rust-lang/rust/pull/39995
5682 [40008]: https://github.com/rust-lang/rust/pull/40008
5683 [40009]: https://github.com/rust-lang/rust/pull/40009
5684 [40027]: https://github.com/rust-lang/rust/pull/40027
5685 [40028]: https://github.com/rust-lang/rust/pull/40028
5686 [40037]: https://github.com/rust-lang/rust/pull/40037
5687 [40117]: https://github.com/rust-lang/rust/pull/40117
5688 [40166]: https://github.com/rust-lang/rust/pull/40166
5689 [40245]: https://github.com/rust-lang/rust/pull/40245
5690 [40257]: https://github.com/rust-lang/rust/pull/40257
5691 [40261]: https://github.com/rust-lang/rust/pull/40261
5692 [40265]: https://github.com/rust-lang/rust/pull/40265
5693 [40319]: https://github.com/rust-lang/rust/pull/40319
5694 [40336]: https://github.com/rust-lang/rust/pull/40336
5695 [40526]: https://github.com/rust-lang/rust/pull/40526
5696 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5697 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5698 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5699 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5700 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5701 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5702 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5703 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5704 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5705 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5706 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5707 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5708 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5709 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5710 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5711 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5712 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5713 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5714 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5715 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5716 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5717 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5718 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5719 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5720 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5721 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5722 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5723 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5724 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5725 [mdbook]: https://crates.io/crates/mdbook
5726 [ubook]: https://doc.rust-lang.org/unstable-book/
5729 Version 1.16.0 (2017-03-16)
5730 ===========================
5735 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5736 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5737 match patterns][38069]
5738 * [Clean up semantics of `self` in an import list][38313]
5739 * [`Self` may appear in `impl` headers][38920]
5740 * [`Self` may appear in struct expressions][39282]
5745 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5746 a `.rmeta` file containing only crate metadata][38571]. This can be
5747 used by tools like the Rust Language Service to perform
5748 metadata-only builds.
5749 * [Levenshtein based typo suggestions now work in most places, while
5750 previously they worked only for fields and sometimes for local
5751 variables][38927]. Together with the overhaul of "no
5752 resolution"/"unexpected resolution" errors (#[38154]) they result in
5753 large and systematic improvement in resolution diagnostics.
5754 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5756 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5757 * [`rustc` no longer attempts to provide "consider using an explicit
5758 lifetime" suggestions][37057]. They were inaccurate.
5763 * [`VecDeque::truncate`]
5764 * [`VecDeque::resize`]
5765 * [`String::insert_str`]
5766 * [`Duration::checked_add`]
5767 * [`Duration::checked_sub`]
5768 * [`Duration::checked_div`]
5769 * [`Duration::checked_mul`]
5772 * [`SocketAddr::is_ipv4`]
5773 * [`SocketAddr::is_ipv6`]
5774 * [`IpAddr::is_ipv4`]
5775 * [`IpAddr::is_ipv6`]
5777 * [`Vec::dedup_by_key`]
5778 * [`Result::unwrap_or_default`]
5779 * [`<*const T>::wrapping_offset`]
5780 * [`<*mut T>::wrapping_offset`]
5781 * `CommandExt::creation_flags`
5782 * [`File::set_permissions`]
5783 * [`String::split_off`]
5788 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5789 their argument by `Borrow` parameter][37761]
5790 * [All public types in std implement `Debug`][38006]
5791 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5792 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5793 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5795 * [std: Fix partial writes in `LineWriter`][38062]
5796 * [std: Clamp max read/write sizes on Unix][38062]
5797 * [Use more specific panic message for `&str` slicing errors][38066]
5798 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5799 functionality cannot be achieved in std currently.
5800 * [`writeln!`, like `println!`, now accepts a form with no string
5801 or formatting arguments, to just print a newline][38469]
5802 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5803 * [Reduce the size of static data in `std_unicode::tables`][38781]
5804 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5805 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5807 * [`Duration` implements `Sum`][38712]
5808 * [`String` implements `ToSocketAddrs`][39048]
5813 * [The `cargo check` command does a type check of a project without
5814 building it][cargo/3296]
5815 * [crates.io will display CI badges from Travis and AppVeyor, if
5816 specified in Cargo.toml][cargo/3546]
5817 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5818 * [Compilation profiles accept integer values for `debug`, in addition
5819 to `true` and `false`. These are passed to `rustc` as the value to
5820 `-C debuginfo`][cargo/3534]
5821 * [Implement `cargo --version --verbose`][cargo/3604]
5822 * [All builds now output 'dep-info' build dependencies compatible with
5823 make and ninja][cargo/3557]
5824 * [Build all workspace members with `build --all`][cargo/3511]
5825 * [Document all workspace members with `doc --all`][cargo/3515]
5826 * [Path deps outside workspace are not members][cargo/3443]
5831 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5832 the path to the Rust implementation][38589]
5833 * [The `armv7-linux-androideabi` target no longer enables NEON
5834 extensions, per Google's ABI guide][38413]
5835 * [The stock standard library can be compiled for Redox OS][38401]
5836 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5838 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5840 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5845 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5846 match patterns][38069]
5847 * In this release, references to uninhabited types can not be
5848 pattern-matched. This was accidentally allowed in 1.15.
5849 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5850 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5852 * [Clean up semantics of `self` in an import list][38313]
5853 * Reimplemented lifetime elision. This change was almost entirely compatible
5854 with existing code, but it did close a number of small bugs and loopholes,
5855 as well as being more accepting in some other [cases][41105].
5857 [37057]: https://github.com/rust-lang/rust/pull/37057
5858 [37761]: https://github.com/rust-lang/rust/pull/37761
5859 [38006]: https://github.com/rust-lang/rust/pull/38006
5860 [38051]: https://github.com/rust-lang/rust/pull/38051
5861 [38062]: https://github.com/rust-lang/rust/pull/38062
5862 [38062]: https://github.com/rust-lang/rust/pull/38622
5863 [38066]: https://github.com/rust-lang/rust/pull/38066
5864 [38069]: https://github.com/rust-lang/rust/pull/38069
5865 [38131]: https://github.com/rust-lang/rust/pull/38131
5866 [38154]: https://github.com/rust-lang/rust/pull/38154
5867 [38274]: https://github.com/rust-lang/rust/pull/38274
5868 [38304]: https://github.com/rust-lang/rust/pull/38304
5869 [38313]: https://github.com/rust-lang/rust/pull/38313
5870 [38314]: https://github.com/rust-lang/rust/pull/38314
5871 [38327]: https://github.com/rust-lang/rust/pull/38327
5872 [38401]: https://github.com/rust-lang/rust/pull/38401
5873 [38413]: https://github.com/rust-lang/rust/pull/38413
5874 [38469]: https://github.com/rust-lang/rust/pull/38469
5875 [38559]: https://github.com/rust-lang/rust/pull/38559
5876 [38571]: https://github.com/rust-lang/rust/pull/38571
5877 [38580]: https://github.com/rust-lang/rust/pull/38580
5878 [38589]: https://github.com/rust-lang/rust/pull/38589
5879 [38670]: https://github.com/rust-lang/rust/pull/38670
5880 [38712]: https://github.com/rust-lang/rust/pull/38712
5881 [38726]: https://github.com/rust-lang/rust/pull/38726
5882 [38781]: https://github.com/rust-lang/rust/pull/38781
5883 [38798]: https://github.com/rust-lang/rust/pull/38798
5884 [38909]: https://github.com/rust-lang/rust/pull/38909
5885 [38920]: https://github.com/rust-lang/rust/pull/38920
5886 [38927]: https://github.com/rust-lang/rust/pull/38927
5887 [39048]: https://github.com/rust-lang/rust/pull/39048
5888 [39282]: https://github.com/rust-lang/rust/pull/39282
5889 [39379]: https://github.com/rust-lang/rust/pull/39379
5890 [41105]: https://github.com/rust-lang/rust/issues/41105
5891 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5892 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5893 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5894 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5895 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5896 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5897 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5898 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5899 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5900 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5901 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5902 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5903 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5904 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5905 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5906 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5907 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5908 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5909 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5910 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5911 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5912 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5913 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5914 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5915 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5916 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5917 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5918 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5919 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5920 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5923 Version 1.15.1 (2017-02-09)
5924 ===========================
5926 * [Fix IntoIter::as_mut_slice's signature][39466]
5927 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5929 [39466]: https://github.com/rust-lang/rust/pull/39466
5930 [39523]: https://github.com/rust-lang/rust/pull/39523
5933 Version 1.15.0 (2017-02-02)
5934 ===========================
5939 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5940 stable. This allows popular code-generating crates like Serde and Diesel to
5941 work ergonomically. [RFC 1681].
5942 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5943 with curly braces][36868]. Part of [RFC 1506].
5944 * [A number of minor changes to name resolution have been activated][37127].
5945 They add up to more consistent semantics, allowing for future evolution of
5946 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5947 details of what is different. The breaking changes here have been transitioned
5948 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5949 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5951 * [`?Sized` can be used in `where` clauses][37791]
5952 * [There is now a limit on the size of monomorphized types and it can be
5953 modified with the `#![type_size_limit]` crate attribute, similarly to
5954 the `#![recursion_limit]` attribute][37789]
5959 * [On Windows, the compiler will apply dllimport attributes when linking to
5960 extern functions][37973]. Additional attributes and flags can control which
5961 library kind is linked and its name. [RFC 1717].
5962 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5963 * [The `--test` flag works with procedural macro crates][38107]
5964 * [Fix `extern "aapcs" fn` ABI][37814]
5965 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5966 * [The `format!` expander recognizes incorrect `printf` and shell-style
5967 formatting directives and suggests the correct format][37613].
5968 * [Only report one error for all unused imports in an import list][37456]
5970 Compiler Performance
5971 --------------------
5973 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5974 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5975 * [Don't clone in `UnificationTable::probe`][37848]
5976 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5977 * [Use small vectors in type walker][37760]
5978 * [Macro expansion performance was improved][37701]
5979 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5980 * [Replace FNV with a faster hash function][37229]
5985 * [`std::iter::Iterator::min_by`]
5986 * [`std::iter::Iterator::max_by`]
5987 * [`std::os::*::fs::FileExt`]
5988 * [`std::sync::atomic::Atomic*::get_mut`]
5989 * [`std::sync::atomic::Atomic*::into_inner`]
5990 * [`std::vec::IntoIter::as_slice`]
5991 * [`std::vec::IntoIter::as_mut_slice`]
5992 * [`std::sync::mpsc::Receiver::try_iter`]
5993 * [`std::os::unix::process::CommandExt::before_exec`]
5994 * [`std::rc::Rc::strong_count`]
5995 * [`std::rc::Rc::weak_count`]
5996 * [`std::sync::Arc::strong_count`]
5997 * [`std::sync::Arc::weak_count`]
5998 * [`std::char::encode_utf8`]
5999 * [`std::char::encode_utf16`]
6000 * [`std::cell::Ref::clone`]
6001 * [`std::io::Take::into_inner`]
6006 * [The standard sorting algorithm has been rewritten for dramatic performance
6007 improvements][38192]. It is a hybrid merge sort, drawing influences from
6008 Timsort. Previously it was a naive merge sort.
6009 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6010 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6012 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6013 and `char_indices().last()`][37882]
6014 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6015 * [Chinese characters display correctly in `fmt::Debug`][37855]
6016 * [Derive `Default` for `Duration`][37699]
6017 * [Support creation of anonymous pipes on WinXP/2k][37677]
6018 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6019 * [Don't pass overlapped handles to processes][38835]
6024 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6025 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6026 should instead check the variable at runtime with `std::env`. That the value
6027 was set at build time was a bug, and incorrect when cross-compiling. This
6028 change is known to cause breakage.
6029 * [Add `--all` flag to `cargo test`][cargo/3221]
6030 * [Compile statically against the MSVC CRT][cargo/3363]
6031 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6032 * [Link OpenSSL statically on OSX][cargo/3311]
6033 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6034 * [Test for bad path overrides with summaries][cargo/3336]
6035 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6036 * [Fix retrying crate downloads for network errors][cargo/3348]
6037 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6038 * [Emit more info on --message-format=json][cargo/3319]
6039 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6040 * [Don't ignore errors in workspace manifest][cargo/3409]
6041 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6046 * [Test runners (binaries built with `--test`) now support a `--list` argument
6047 that lists the tests it contains][38185]
6048 * [Test runners now support a `--exact` argument that makes the test filter
6049 match exactly, instead of matching only a substring of the test name][38181]
6050 * [rustdoc supports a `--playground-url` flag][37763]
6051 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6056 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6057 continue to be used in this release by passing `--disable-rustbuild` to the
6058 configure script, but they will be deleted soon. Note that the new build
6059 system uses a different on-disk layout that will likely affect any scripts
6061 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6063 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6064 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6070 * [A number of minor changes to name resolution have been activated][37127].
6071 They add up to more consistent semantics, allowing for future evolution of
6072 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6073 details of what is different. The breaking changes here have been transitioned
6074 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6075 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6076 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6077 should instead check the variable at runtime with `std::env`. That the value
6078 was set at build time was a bug, and incorrect when cross-compiling. This
6079 change is known to cause breakage.
6080 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6081 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6082 1.10 and is now an error by default. It will become a hard error in the near
6084 * [The semantics relating modules to file system directories are changing in
6085 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6086 lint, which is a warning in this release, and will become a hard error in the
6088 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6089 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6090 the underlying iterator][37834]
6092 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6093 [33685]: https://github.com/rust-lang/rust/issues/33685
6094 [36868]: https://github.com/rust-lang/rust/pull/36868
6095 [37127]: https://github.com/rust-lang/rust/pull/37127
6096 [37229]: https://github.com/rust-lang/rust/pull/37229
6097 [37456]: https://github.com/rust-lang/rust/pull/37456
6098 [37527]: https://github.com/rust-lang/rust/pull/37527
6099 [37602]: https://github.com/rust-lang/rust/pull/37602
6100 [37613]: https://github.com/rust-lang/rust/pull/37613
6101 [37615]: https://github.com/rust-lang/rust/pull/37615
6102 [37636]: https://github.com/rust-lang/rust/pull/37636
6103 [37627]: https://github.com/rust-lang/rust/pull/37627
6104 [37642]: https://github.com/rust-lang/rust/pull/37642
6105 [37677]: https://github.com/rust-lang/rust/pull/37677
6106 [37699]: https://github.com/rust-lang/rust/pull/37699
6107 [37701]: https://github.com/rust-lang/rust/pull/37701
6108 [37705]: https://github.com/rust-lang/rust/pull/37705
6109 [37749]: https://github.com/rust-lang/rust/pull/37749
6110 [37760]: https://github.com/rust-lang/rust/pull/37760
6111 [37763]: https://github.com/rust-lang/rust/pull/37763
6112 [37764]: https://github.com/rust-lang/rust/pull/37764
6113 [37789]: https://github.com/rust-lang/rust/pull/37789
6114 [37791]: https://github.com/rust-lang/rust/pull/37791
6115 [37814]: https://github.com/rust-lang/rust/pull/37814
6116 [37817]: https://github.com/rust-lang/rust/pull/37817
6117 [37834]: https://github.com/rust-lang/rust/pull/37834
6118 [37848]: https://github.com/rust-lang/rust/pull/37848
6119 [37855]: https://github.com/rust-lang/rust/pull/37855
6120 [37882]: https://github.com/rust-lang/rust/pull/37882
6121 [37888]: https://github.com/rust-lang/rust/pull/37888
6122 [37973]: https://github.com/rust-lang/rust/pull/37973
6123 [37979]: https://github.com/rust-lang/rust/pull/37979
6124 [38086]: https://github.com/rust-lang/rust/pull/38086
6125 [38107]: https://github.com/rust-lang/rust/pull/38107
6126 [38117]: https://github.com/rust-lang/rust/pull/38117
6127 [38134]: https://github.com/rust-lang/rust/pull/38134
6128 [38146]: https://github.com/rust-lang/rust/pull/38146
6129 [38181]: https://github.com/rust-lang/rust/pull/38181
6130 [38182]: https://github.com/rust-lang/rust/pull/38182
6131 [38185]: https://github.com/rust-lang/rust/pull/38185
6132 [38192]: https://github.com/rust-lang/rust/pull/38192
6133 [38279]: https://github.com/rust-lang/rust/pull/38279
6134 [38835]: https://github.com/rust-lang/rust/pull/38835
6135 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6136 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6137 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6138 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6139 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6140 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6141 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6142 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6143 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6144 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6145 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6146 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6147 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6148 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6149 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6150 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6151 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6152 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6153 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6154 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6155 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6156 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6157 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6158 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6159 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6160 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6161 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6162 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6163 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6164 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6165 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6166 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6167 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6168 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6169 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6170 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6171 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6172 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6175 Version 1.14.0 (2016-12-22)
6176 ===========================
6181 * [`..` matches multiple tuple fields in enum variants, structs
6182 and tuples][36843]. [RFC 1492].
6183 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6184 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6185 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6186 dereferencing][36822]
6191 * [Mark enums with non-zero discriminant as non-zero][37224]
6192 * [Lower-case `static mut` names are linted like other
6193 statics and consts][37162]
6194 * [Fix ICE on some macros in const integer positions
6195 (e.g. `[u8; m!()]`)][36819]
6196 * [Improve error message and snippet for "did you mean `x`"][36798]
6197 * [Add a panic-strategy field to the target specification][36794]
6198 * [Include LLVM version in `--version --verbose`][37200]
6200 Compile-time Optimizations
6201 --------------------------
6203 * [Improve macro expansion performance][37569]
6204 * [Shrink `Expr_::ExprInlineAsm`][37445]
6205 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6206 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6207 * [Avoid more allocations when compiling html5ever][37373]
6208 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6209 * [Avoid some allocations in the macro parser][37318]
6210 * [Use a faster deflate setting][37298]
6211 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6212 during interning of slices][37270]
6213 * [Optimize `write_metadata`][37267]
6214 * [Don't process obligation forest cycles when stalled][37231]
6215 * [Avoid many `CrateConfig` clones][37161]
6216 * [Optimize `Substs::super_fold_with`][37108]
6217 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6218 * [Speed up `plug_leaks`][36917]
6223 * [`println!()`, with no arguments, prints newline][36825].
6224 Previously, an empty string was required to achieve the same.
6225 * [`Wrapping` impls standard binary and unary operators, as well as
6226 the `Sum` and `Product` iterators][37356]
6227 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6229 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6230 `VecDeque` iterators][37315]
6231 * [Improve `SipHasher` performance on small values][37312]
6232 * [Add Iterator trait TrustedLen to enable better FromIterator /
6234 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6235 * [`ReadDir` implements `Debug`][37221]
6236 * [Implement `RefUnwindSafe` for atomic types][37178]
6237 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6238 * [Avoid allocations in `Decoder::read_str`][37064]
6239 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6240 * [Impl `Debug` for raw pointers to unsized data][36880]
6241 * [Don't reuse `HashMap` random seeds][37470]
6242 * [The internal memory layout of `HashMap` is more cache-friendly, for
6243 significant improvements in some operations][36692]
6244 * [`HashMap` uses less memory on 32-bit architectures][36595]
6245 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6250 * [Expose rustc cfg values to build scripts][cargo/3243]
6251 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6252 * [Fix passing --features when testing multiple packages][cargo/3280]
6253 * [Use a single profile set per workspace][cargo/3249]
6254 * [Load `replace` sections from lock files][cargo/3220]
6255 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6260 * [rustup is the recommended Rust installation method][1.14rustup]
6261 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6262 S390x. These are [tier 2] platforms and may have major defects. Follow the
6263 instructions on the website to install, or add the targets to an existing
6264 installation with `rustup target add`. The new target triples are:
6265 - `mips-unknown-linux-gnu`
6266 - `mipsel-unknown-linux-gnu`
6267 - `mips64-unknown-linux-gnuabi64`
6268 - `mips64el-unknown-linux-gnuabi64 `
6269 - `powerpc-unknown-linux-gnu`
6270 - `powerpc64-unknown-linux-gnu`
6271 - `powerpc64le-unknown-linux-gnu`
6272 - `s390x-unknown-linux-gnu `
6273 * This release includes target (std) builds for ARM Linux running MUSL
6274 libc. These are [tier 2] platforms and may have major defects. Add the
6275 following triples to an existing rustup installation with `rustup target add`:
6276 - `arm-unknown-linux-musleabi`
6277 - `arm-unknown-linux-musleabihf`
6278 - `armv7-unknown-linux-musleabihf`
6279 * This release includes [experimental support for WebAssembly][1.14wasm], via
6280 the `wasm32-unknown-emscripten` target. This target is known to have major
6281 defects. Please test, report, and fix.
6282 * rustup no longer installs documentation by default. Run `rustup
6283 component add rust-docs` to install.
6284 * [Fix line stepping in debugger][37310]
6285 * [Enable line number debuginfo in releases][37280]
6290 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6291 * [Add support for Fuchsia OS][37313]
6292 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6297 * [A number of forward-compatibility lints used by the compiler
6298 to gradually introduce language changes have been converted
6299 to deny by default][36894]:
6300 - ["use of inaccessible extern crate erroneously allowed"][36886]
6301 - ["type parameter default erroneously allowed in invalid location"][36887]
6302 - ["detects super or self keywords at the beginning of global path"][36888]
6303 - ["two overlapping inherent impls define an item with the same name
6304 were erroneously allowed"][36889]
6305 - ["floating-point constants cannot be used in patterns"][36890]
6306 - ["constants of struct or enum type can only be used in a pattern if
6307 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6308 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6309 * [Prohibit patterns in trait methods without bodies][37378]
6310 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6311 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6312 * [The `$crate` macro variable is accepted in fewer locations][37213]
6313 * [Impls specifying extra region requirements beyond the trait
6314 they implement are rejected][37167]
6315 * [Enums may not be unsized][37111]. Unsized enums are intended to
6316 work but never have. For now they are forbidden.
6317 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6319 [tier 2]: https://forge.rust-lang.org/platform-support.html
6320 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6321 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6322 [36430]: https://github.com/rust-lang/rust/pull/36430
6323 [36595]: https://github.com/rust-lang/rust/pull/36595
6324 [36595]: https://github.com/rust-lang/rust/pull/36595
6325 [36692]: https://github.com/rust-lang/rust/pull/36692
6326 [36767]: https://github.com/rust-lang/rust/pull/36767
6327 [36794]: https://github.com/rust-lang/rust/pull/36794
6328 [36798]: https://github.com/rust-lang/rust/pull/36798
6329 [36819]: https://github.com/rust-lang/rust/pull/36819
6330 [36822]: https://github.com/rust-lang/rust/pull/36822
6331 [36825]: https://github.com/rust-lang/rust/pull/36825
6332 [36843]: https://github.com/rust-lang/rust/pull/36843
6333 [36880]: https://github.com/rust-lang/rust/pull/36880
6334 [36886]: https://github.com/rust-lang/rust/issues/36886
6335 [36887]: https://github.com/rust-lang/rust/issues/36887
6336 [36888]: https://github.com/rust-lang/rust/issues/36888
6337 [36889]: https://github.com/rust-lang/rust/issues/36889
6338 [36890]: https://github.com/rust-lang/rust/issues/36890
6339 [36891]: https://github.com/rust-lang/rust/issues/36891
6340 [36892]: https://github.com/rust-lang/rust/issues/36892
6341 [36894]: https://github.com/rust-lang/rust/pull/36894
6342 [36917]: https://github.com/rust-lang/rust/pull/36917
6343 [36993]: https://github.com/rust-lang/rust/pull/36993
6344 [37037]: https://github.com/rust-lang/rust/pull/37037
6345 [37064]: https://github.com/rust-lang/rust/pull/37064
6346 [37094]: https://github.com/rust-lang/rust/pull/37094
6347 [37108]: https://github.com/rust-lang/rust/pull/37108
6348 [37111]: https://github.com/rust-lang/rust/pull/37111
6349 [37161]: https://github.com/rust-lang/rust/pull/37161
6350 [37162]: https://github.com/rust-lang/rust/pull/37162
6351 [37167]: https://github.com/rust-lang/rust/pull/37167
6352 [37178]: https://github.com/rust-lang/rust/pull/37178
6353 [37200]: https://github.com/rust-lang/rust/pull/37200
6354 [37213]: https://github.com/rust-lang/rust/pull/37213
6355 [37221]: https://github.com/rust-lang/rust/pull/37221
6356 [37224]: https://github.com/rust-lang/rust/pull/37224
6357 [37230]: https://github.com/rust-lang/rust/pull/37230
6358 [37231]: https://github.com/rust-lang/rust/pull/37231
6359 [37247]: https://github.com/rust-lang/rust/pull/37247
6360 [37267]: https://github.com/rust-lang/rust/pull/37267
6361 [37270]: https://github.com/rust-lang/rust/pull/37270
6362 [37273]: https://github.com/rust-lang/rust/pull/37273
6363 [37280]: https://github.com/rust-lang/rust/pull/37280
6364 [37298]: https://github.com/rust-lang/rust/pull/37298
6365 [37306]: https://github.com/rust-lang/rust/pull/37306
6366 [37310]: https://github.com/rust-lang/rust/pull/37310
6367 [37312]: https://github.com/rust-lang/rust/pull/37312
6368 [37313]: https://github.com/rust-lang/rust/pull/37313
6369 [37315]: https://github.com/rust-lang/rust/pull/37315
6370 [37318]: https://github.com/rust-lang/rust/pull/37318
6371 [37322]: https://github.com/rust-lang/rust/pull/37322
6372 [37326]: https://github.com/rust-lang/rust/pull/37326
6373 [37351]: https://github.com/rust-lang/rust/pull/37351
6374 [37356]: https://github.com/rust-lang/rust/pull/37356
6375 [37367]: https://github.com/rust-lang/rust/pull/37367
6376 [37373]: https://github.com/rust-lang/rust/pull/37373
6377 [37378]: https://github.com/rust-lang/rust/pull/37378
6378 [37389]: https://github.com/rust-lang/rust/pull/37389
6379 [37392]: https://github.com/rust-lang/rust/pull/37392
6380 [37427]: https://github.com/rust-lang/rust/pull/37427
6381 [37439]: https://github.com/rust-lang/rust/pull/37439
6382 [37445]: https://github.com/rust-lang/rust/pull/37445
6383 [37470]: https://github.com/rust-lang/rust/pull/37470
6384 [37569]: https://github.com/rust-lang/rust/pull/37569
6385 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6386 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6387 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6388 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6389 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6390 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6391 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6394 Version 1.13.0 (2016-11-10)
6395 ===========================
6400 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6401 errors, like the `try!` macro, described in [RFC 0243].
6402 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6403 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6404 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6405 * [Fix lifetime rules for 'if' conditions][36029]
6406 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6411 * [Add the `-C link-arg` argument][36574]
6412 * [Remove the old AST-based backend from rustc_trans][35764]
6413 * [Don't enable NEON by default on armv7 Linux][35814]
6414 * [Fix debug line number info for macro expansions][35238]
6415 * [Do not emit "class method" debuginfo for types that are not
6416 DICompositeType][36008]
6417 * [Warn about multiple conflicting #[repr] hints][34623]
6418 * [When sizing DST, don't double-count nested struct prefixes][36351]
6419 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6420 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6421 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6422 * [Expand macros without recursing to avoid stack overflows][36214]
6427 * [Replace macro backtraces with labeled local uses][35702]
6428 * [Improve error message for misplaced doc comments][33922]
6429 * [Buffer unix and lock windows to prevent message interleaving][35975]
6430 * [Update lifetime errors to specifically note temporaries][36171]
6431 * [Special case a few colors for Windows][36178]
6432 * [Suggest `use self` when such an import resolves][36289]
6433 * [Be more specific when type parameter shadows primitive type][36338]
6434 * Many minor improvements
6436 Compile-time Optimizations
6437 --------------------------
6439 * [Compute and cache HIR hashes at beginning][35854]
6440 * [Don't hash types in loan paths][36004]
6441 * [Cache projections in trans][35761]
6442 * [Optimize the parser's last token handling][36527]
6443 * [Only instantiate #[inline] functions in codegen units referencing
6444 them][36524]. This leads to big improvements in cases where crates export
6445 define many inline functions without using them directly.
6446 * [Lazily allocate TypedArena's first chunk][36592]
6447 * [Don't allocate during default HashSet creation][36734]
6454 * [`overflowing_abs`]
6455 * [`RefCell::try_borrow`]
6456 * [`RefCell::try_borrow_mut`]
6461 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6462 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6464 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6465 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6466 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6467 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6468 * [Use arc4rand on FreeBSD][35884]
6469 * [memrchr: Correct aligned offset computation][35969]
6470 * [Improve Demangling of Rust Symbols][36059]
6471 * [Use monotonic time in condition variables][35048]
6472 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6473 * [Implement conversion traits for `char`][35755]
6474 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6475 * [Zero first byte of CString on drop][36264]
6476 * [Inherit overflow checks for sum and product][36372]
6477 * [Add missing Eq implementations][36423]
6478 * [Implement `Debug` for `DirEntry`][36631]
6479 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6481 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6482 * [Implement more traits for `std::io::ErrorKind`][35911]
6483 * [Optimize BinaryHeap bounds checking][36072]
6484 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6485 `extend_with_element`][36355]
6486 * [Fix overflow checking in unsigned pow()][34942]
6491 * This release includes security fixes to both curl and OpenSSL.
6492 * [Fix transitive doctests when panic=abort][cargo/3021]
6493 * [Add --all-features flag to cargo][cargo/3038]
6494 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6495 * [Don't parse the home directory more than once][cargo/3078]
6496 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6497 * [Update OpenSSL to 1.0.2j][cargo/3121]
6498 * [Add license and license_file to cargo metadata output][cargo/3110]
6499 * [Make crates-io registry URL optional in config; ignore all changes to
6500 source.crates-io][cargo/3089]
6501 * [Don't download dependencies from other platforms][cargo/3123]
6502 * [Build transitive dev-dependencies when needed][cargo/3125]
6503 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6504 * [Avoid updating registry when adding existing deps][cargo/3144]
6505 * [Warn about path overrides that won't work][cargo/3136]
6506 * [Use workspaces during `cargo install`][cargo/3146]
6507 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6508 * [Add --message-format flag][cargo/3000]
6509 * [Pass target environment for rustdoc][cargo/3205]
6510 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6511 * [Update curl and curl-sys][cargo/3241]
6512 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6517 * [rustdoc: Add the `--sysroot` argument][36586]
6518 * [rustdoc: Fix a couple of issues with the search results][35655]
6519 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6520 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6521 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6526 * [Remove unmaintained style guide][35124]
6527 * [Add s390x support][36369]
6528 * [Initial work at Haiku OS support][36727]
6529 * [Add mips-uclibc targets][35734]
6530 * [Crate-ify compiler-rt into compiler-builtins][35021]
6531 * [Add rustc version info (git hash + date) to dist tarball][36213]
6532 * Many documentation improvements
6537 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6538 * [Deny (by default) transmuting from fn item types to pointer-sized
6539 types][34923]. Continuing the long transition to zero-sized fn items,
6541 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6543 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6544 * [Fix lifetime rules for 'if' conditions][36029].
6545 * [Inherit overflow checks for sum and product][36372].
6546 * [Forbid user-defined macros named "macro_rules"][36730].
6548 [33922]: https://github.com/rust-lang/rust/pull/33922
6549 [34623]: https://github.com/rust-lang/rust/pull/34623
6550 [34923]: https://github.com/rust-lang/rust/pull/34923
6551 [34942]: https://github.com/rust-lang/rust/pull/34942
6552 [34982]: https://github.com/rust-lang/rust/pull/34982
6553 [35021]: https://github.com/rust-lang/rust/pull/35021
6554 [35048]: https://github.com/rust-lang/rust/pull/35048
6555 [35074]: https://github.com/rust-lang/rust/pull/35074
6556 [35124]: https://github.com/rust-lang/rust/pull/35124
6557 [35234]: https://github.com/rust-lang/rust/pull/35234
6558 [35238]: https://github.com/rust-lang/rust/pull/35238
6559 [35354]: https://github.com/rust-lang/rust/pull/35354
6560 [35559]: https://github.com/rust-lang/rust/pull/35559
6561 [35585]: https://github.com/rust-lang/rust/pull/35585
6562 [35627]: https://github.com/rust-lang/rust/pull/35627
6563 [35655]: https://github.com/rust-lang/rust/pull/35655
6564 [35702]: https://github.com/rust-lang/rust/pull/35702
6565 [35707]: https://github.com/rust-lang/rust/pull/35707
6566 [35728]: https://github.com/rust-lang/rust/pull/35728
6567 [35734]: https://github.com/rust-lang/rust/pull/35734
6568 [35755]: https://github.com/rust-lang/rust/pull/35755
6569 [35761]: https://github.com/rust-lang/rust/pull/35761
6570 [35764]: https://github.com/rust-lang/rust/pull/35764
6571 [35814]: https://github.com/rust-lang/rust/pull/35814
6572 [35854]: https://github.com/rust-lang/rust/pull/35854
6573 [35871]: https://github.com/rust-lang/rust/pull/35871
6574 [35884]: https://github.com/rust-lang/rust/pull/35884
6575 [35911]: https://github.com/rust-lang/rust/pull/35911
6576 [35969]: https://github.com/rust-lang/rust/pull/35969
6577 [35975]: https://github.com/rust-lang/rust/pull/35975
6578 [36004]: https://github.com/rust-lang/rust/pull/36004
6579 [36008]: https://github.com/rust-lang/rust/pull/36008
6580 [36014]: https://github.com/rust-lang/rust/pull/36014
6581 [36029]: https://github.com/rust-lang/rust/pull/36029
6582 [36059]: https://github.com/rust-lang/rust/pull/36059
6583 [36072]: https://github.com/rust-lang/rust/pull/36072
6584 [36101]: https://github.com/rust-lang/rust/pull/36101
6585 [36104]: https://github.com/rust-lang/rust/pull/36104
6586 [36171]: https://github.com/rust-lang/rust/pull/36171
6587 [36173]: https://github.com/rust-lang/rust/pull/36173
6588 [36178]: https://github.com/rust-lang/rust/pull/36178
6589 [36213]: https://github.com/rust-lang/rust/pull/36213
6590 [36214]: https://github.com/rust-lang/rust/pull/36214
6591 [36264]: https://github.com/rust-lang/rust/pull/36264
6592 [36266]: https://github.com/rust-lang/rust/pull/36266
6593 [36289]: https://github.com/rust-lang/rust/pull/36289
6594 [36338]: https://github.com/rust-lang/rust/pull/36338
6595 [36351]: https://github.com/rust-lang/rust/pull/36351
6596 [36355]: https://github.com/rust-lang/rust/pull/36355
6597 [36369]: https://github.com/rust-lang/rust/pull/36369
6598 [36372]: https://github.com/rust-lang/rust/pull/36372
6599 [36423]: https://github.com/rust-lang/rust/pull/36423
6600 [36482]: https://github.com/rust-lang/rust/pull/36482
6601 [36505]: https://github.com/rust-lang/rust/pull/36505
6602 [36524]: https://github.com/rust-lang/rust/pull/36524
6603 [36527]: https://github.com/rust-lang/rust/pull/36527
6604 [36551]: https://github.com/rust-lang/rust/pull/36551
6605 [36574]: https://github.com/rust-lang/rust/pull/36574
6606 [36586]: https://github.com/rust-lang/rust/pull/36586
6607 [36592]: https://github.com/rust-lang/rust/pull/36592
6608 [36631]: https://github.com/rust-lang/rust/pull/36631
6609 [36639]: https://github.com/rust-lang/rust/pull/36639
6610 [36721]: https://github.com/rust-lang/rust/pull/36721
6611 [36727]: https://github.com/rust-lang/rust/pull/36727
6612 [36730]: https://github.com/rust-lang/rust/pull/36730
6613 [36734]: https://github.com/rust-lang/rust/pull/36734
6614 [36754]: https://github.com/rust-lang/rust/pull/36754
6615 [36995]: https://github.com/rust-lang/rust/pull/36995
6616 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6617 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6618 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6619 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6620 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6621 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6622 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6623 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6624 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6625 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6626 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6627 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6628 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6629 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6630 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6631 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6632 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6633 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6634 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6635 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6636 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6637 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6638 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6639 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6640 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6641 [rustup]: https://www.rustup.rs
6642 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6643 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6644 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6645 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6646 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6647 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6648 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6651 Version 1.12.1 (2016-10-20)
6652 ===========================
6657 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6658 * [Confusion with double negation and booleans][36856]
6659 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6660 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6661 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6662 * [Corrupted memory after updated to 1.12][36936]
6663 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6664 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6665 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6667 [36381]: https://github.com/rust-lang/rust/issues/36381
6668 [36856]: https://github.com/rust-lang/rust/issues/36856
6669 [36875]: https://github.com/rust-lang/rust/issues/36875
6670 [36924]: https://github.com/rust-lang/rust/issues/36924
6671 [36926]: https://github.com/rust-lang/rust/issues/36926
6672 [36936]: https://github.com/rust-lang/rust/issues/36936
6673 [37026]: https://github.com/rust-lang/rust/issues/37026
6674 [37112]: https://github.com/rust-lang/rust/issues/37112
6675 [37153]: https://github.com/rust-lang/rust/issues/37153
6678 Version 1.12.0 (2016-09-29)
6679 ===========================
6684 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6685 This translation pass is far simpler than the previous AST->LLVM pass, and
6686 creates opportunities to perform new optimizations directly on the MIR. It
6687 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6688 * [`rustc` presents a new, more readable error format, along with
6689 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6690 Most common editors supporting Rust have been updated to work with it. It was
6691 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6696 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6697 This translation pass is far simpler than the previous AST->LLVM pass, and
6698 creates opportunities to perform new optimizations directly on the MIR. It
6699 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6700 * [Print the Rust target name, not the LLVM target name, with
6701 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6702 * [The computation of `TypeId` is correct in some cases where it was previously
6703 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6704 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6705 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6706 `--print relocation-models`, and `--print code-models` print the available
6707 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6708 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6709 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6710 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6711 These targets produce statically-linked binaries. There are no binary release
6717 * [`rustc` presents a new, more readable error format, along with
6718 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6719 Most common editors supporting Rust have been updated to work with it. It was
6720 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6721 * [In error descriptions, references are now described in plain English,
6722 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6723 * [In error type descriptions, unknown numeric types are named `{integer}` or
6724 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6725 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6730 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6731 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6732 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6733 useful](https://github.com/rust-lang/rust/pull/34908)
6734 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6735 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6736 * [Semicolons are properly required as statement delimiters inside
6737 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6738 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6743 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6744 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6745 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6746 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6747 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6748 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6749 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6750 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6751 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6752 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6753 Both on Unix and Windows.
6754 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6755 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6756 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6757 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6758 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6759 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6760 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6761 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6766 * [The `format!` macro and friends now allow a single argument to be formatted
6767 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6768 * [The lifetime bounds on `[T]::binary_search_by` and
6769 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6770 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6771 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6772 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6773 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6774 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6775 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6776 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6777 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6778 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6779 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6780 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6781 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6782 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6783 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6784 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6785 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6786 * [`mpsc::sync_channel` `Receiver`s return any available message before
6787 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6788 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6789 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6794 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6795 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6796 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6797 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6798 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6799 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6800 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6801 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6802 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6803 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6804 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6805 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6806 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6807 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6808 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6809 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6814 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6815 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6820 * [Test binaries now support a `--test-threads` argument to specify the number
6821 of threads used to run tests, and which acts the same as the
6822 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6823 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6824 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6825 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6826 * [Rust releases now come with source packages that can be installed by rustup
6827 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6828 The resulting source code can be used by tools and IDES, located in the
6829 sysroot under `lib/rustlib/src`.
6834 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6835 * Many minor improvements to the documentation.
6836 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6841 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6842 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6843 * [When formatting strings, if "precision" is specified, the "fill",
6844 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6845 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6848 Version 1.11.0 (2016-08-18)
6849 ===========================
6854 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6855 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6856 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6857 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6862 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6863 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6864 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6865 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6866 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6867 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6868 (in libcore - previously stabilized in libstd)
6869 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6870 (in libcore - previously stabilized in libstd)
6871 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6872 (in libcore - previously stabilized in libstd)
6873 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6874 (in libcore - previously stabilized in libstd)
6875 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6876 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6877 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6878 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6883 * [The `thread_local!` macro supports multiple definitions in a single
6884 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6885 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6886 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6887 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6888 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6889 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6890 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6891 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6896 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6897 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6898 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6899 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6900 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6901 and `-vv` prints warnings for all crates.
6902 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6903 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6904 This provides room for expansion by arbitrary tools.
6905 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6906 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6907 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6908 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6909 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6910 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6911 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6916 * [Caching projections speeds up type check dramatically for some
6917 workloads](https://github.com/rust-lang/rust/pull/33816)
6918 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6919 This hasher is faster, but is believed to provide sufficient
6920 protection from collision attacks.
6921 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6926 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6927 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6928 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6929 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6930 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6935 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6936 * [When emitting debug info, rustc emits frame pointers for closures,
6937 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6938 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6939 * Many more errors have been given error codes and extended
6941 * API documentation continues to be improved, with many new examples
6946 * [rustc no longer hangs when dependencies recursively re-export
6947 submodules](https://github.com/rust-lang/rust/pull/34542)
6948 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6949 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6950 rewritten](https://github.com/rust-lang/rust/pull/33895)
6951 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6952 No targets use this yet, but it works toward AVR support.
6957 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6958 * [The new follow-set rules that place restrictions on `macro_rules!`
6959 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6960 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6961 and has been a warning since 1.10.
6962 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6963 This causes breakage in some corner cases.
6966 Version 1.10.0 (2016-07-07)
6967 ===========================
6972 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6973 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6974 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6975 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6976 * [`panic!` can be converted to a runtime abort with the
6977 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6978 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6979 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6980 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6981 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6982 Note that Cargo does not yet directly support cdylibs.
6987 * `os::windows::fs::OpenOptionsExt::access_mode`
6988 * `os::windows::fs::OpenOptionsExt::share_mode`
6989 * `os::windows::fs::OpenOptionsExt::custom_flags`
6990 * `os::windows::fs::OpenOptionsExt::attributes`
6991 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6992 * `os::unix::fs::OpenOptionsExt::custom_flags`
6993 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6994 * `Default for sync::Weak`
6995 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6996 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6997 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6998 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6999 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7000 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7001 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7002 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7003 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7004 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7005 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7006 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7007 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7008 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7009 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7010 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7011 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7012 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7013 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7014 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7015 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7016 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7017 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7018 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7019 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7020 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7021 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7022 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7023 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7024 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7025 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7026 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7027 * Read/Write/RawFd impls for `UnixStream`
7028 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7029 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7030 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7031 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7032 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7033 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7034 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7035 * RawFd impls for `UnixListener`
7036 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7037 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7038 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7039 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7040 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7041 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7042 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7043 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7044 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7045 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7046 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7047 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7048 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7049 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7050 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7051 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7052 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7053 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7054 * RawFd impls for `UnixDatagram`
7055 * `{BTree,Hash}Map::values_mut`
7056 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7061 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7062 The semantics of this minor method are subtle and probably not what
7064 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7065 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7066 will fall back to `/dev/urandom` temporarily to avoid blocking
7067 during early boot](https://github.com/rust-lang/rust/pull/33086).
7068 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7069 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7070 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7071 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7072 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7073 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7074 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7078 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7079 This controls the runtime behavior of the `panic!` macro
7080 and can be either "unwind" (the default), or "abort".
7081 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7082 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7083 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7084 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7085 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7086 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7087 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7088 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7089 By default they are retried twice, which can be customized with the
7090 `net.retry` value in `.cargo/config`.
7091 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7092 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7093 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7094 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7095 Makes it possible to install multiple crates in parallel.
7096 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7097 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7098 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7099 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7100 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7101 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7106 * [rustc memory usage was reduced by refactoring the context used for
7107 type checking](https://github.com/rust-lang/rust/pull/33425).
7108 * [Speed up creation of `HashMap`s by caching the random keys used
7109 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7110 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7111 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7112 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7113 10x faster than the previous lookup tables.
7114 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7119 * Many incremental improvements to documentation and rustdoc.
7120 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7121 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7122 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7123 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7124 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7125 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7126 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7131 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7132 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7133 * [`std` no longer prints backtraces on platforms where the running
7134 module must be loaded with `env::current_exe`, which can't be relied
7135 on](https://github.com/rust-lang/rust/pull/33554).
7136 * This release includes std binaries for the i586-unknown-linux-gnu,
7137 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7138 i586 target is for old x86 hardware without SSE2, and the armv7
7139 target is for Android running on modern ARM architectures.
7140 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7141 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7142 * [On Unix the runtime aborts by calling `libc::abort` instead of
7143 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7144 * [Rust is now bootstrapped from the previous release of Rust,
7145 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7150 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7151 * [`target_env` for Linux ARM targets is just `gnu`, not
7152 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7153 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7154 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7155 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7156 Affects how macros are parsed.
7157 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7158 * [Feature-gated attributes on macro-generated macro invocations are
7159 now rejected](https://github.com/rust-lang/rust/pull/32791).
7160 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7161 This caused some minor changes to type inference.
7164 Version 1.9.0 (2016-05-26)
7165 ==========================
7170 * The `#[deprecated]` attribute when applied to an API will generate
7171 warnings when used. The warnings may be suppressed with
7172 `#[allow(deprecated)]`. [RFC 1270].
7173 * [`fn` item types are zero sized, and each `fn` names a unique
7174 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7175 `transmute` on a `fn` type will generate a warning for a few cycles,
7176 then will be converted to an error.
7177 * [Field and method resolution understand visibility, so private
7178 fields and methods cannot prevent the proper use of public fields
7179 and methods][1.9fv].
7180 * [The parser considers unicode codepoints in the
7181 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7187 * [`std::panic::catch_unwind`] (renamed from `recover`)
7188 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7189 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7190 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7191 * [`str::is_char_boundary`]
7192 * [`<*const T>::as_ref`]
7193 * [`<*mut T>::as_ref`]
7194 * [`<*mut T>::as_mut`]
7195 * [`AsciiExt::make_ascii_uppercase`]
7196 * [`AsciiExt::make_ascii_lowercase`]
7197 * [`char::decode_utf16`]
7198 * [`char::DecodeUtf16`]
7199 * [`char::DecodeUtf16Error`]
7200 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7201 * [`BTreeSet::take`]
7202 * [`BTreeSet::replace`]
7205 * [`HashSet::replace`]
7207 * [`OsString::with_capacity`]
7208 * [`OsString::clear`]
7209 * [`OsString::capacity`]
7210 * [`OsString::reserve`]
7211 * [`OsString::reserve_exact`]
7212 * [`OsStr::is_empty`]
7214 * [`std::os::unix::thread`]
7217 * [`JoinHandleExt::as_pthread_t`]
7218 * [`JoinHandleExt::into_pthread_t`]
7219 * [`HashSet::hasher`]
7220 * [`HashMap::hasher`]
7221 * [`CommandExt::exec`]
7222 * [`File::try_clone`]
7223 * [`SocketAddr::set_ip`]
7224 * [`SocketAddr::set_port`]
7225 * [`SocketAddrV4::set_ip`]
7226 * [`SocketAddrV4::set_port`]
7227 * [`SocketAddrV6::set_ip`]
7228 * [`SocketAddrV6::set_port`]
7229 * [`SocketAddrV6::set_flowinfo`]
7230 * [`SocketAddrV6::set_scope_id`]
7231 * [`slice::copy_from_slice`]
7232 * [`ptr::read_volatile`]
7233 * [`ptr::write_volatile`]
7234 * [`OpenOptions::create_new`]
7235 * [`TcpStream::set_nodelay`]
7236 * [`TcpStream::nodelay`]
7237 * [`TcpStream::set_ttl`]
7238 * [`TcpStream::ttl`]
7239 * [`TcpStream::set_only_v6`]
7240 * [`TcpStream::only_v6`]
7241 * [`TcpStream::take_error`]
7242 * [`TcpStream::set_nonblocking`]
7243 * [`TcpListener::set_ttl`]
7244 * [`TcpListener::ttl`]
7245 * [`TcpListener::set_only_v6`]
7246 * [`TcpListener::only_v6`]
7247 * [`TcpListener::take_error`]
7248 * [`TcpListener::set_nonblocking`]
7249 * [`UdpSocket::set_broadcast`]
7250 * [`UdpSocket::broadcast`]
7251 * [`UdpSocket::set_multicast_loop_v4`]
7252 * [`UdpSocket::multicast_loop_v4`]
7253 * [`UdpSocket::set_multicast_ttl_v4`]
7254 * [`UdpSocket::multicast_ttl_v4`]
7255 * [`UdpSocket::set_multicast_loop_v6`]
7256 * [`UdpSocket::multicast_loop_v6`]
7257 * [`UdpSocket::set_multicast_ttl_v6`]
7258 * [`UdpSocket::multicast_ttl_v6`]
7259 * [`UdpSocket::set_ttl`]
7260 * [`UdpSocket::ttl`]
7261 * [`UdpSocket::set_only_v6`]
7262 * [`UdpSocket::only_v6`]
7263 * [`UdpSocket::join_multicast_v4`]
7264 * [`UdpSocket::join_multicast_v6`]
7265 * [`UdpSocket::leave_multicast_v4`]
7266 * [`UdpSocket::leave_multicast_v6`]
7267 * [`UdpSocket::take_error`]
7268 * [`UdpSocket::connect`]
7269 * [`UdpSocket::send`]
7270 * [`UdpSocket::recv`]
7271 * [`UdpSocket::set_nonblocking`]
7276 * [`std::sync::Once` is poisoned if its initialization function
7278 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7279 * [Most types implement `fmt::Debug`][1.9db].
7280 * [The default buffer size used by `BufReader` and `BufWriter` was
7281 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7282 used by other languages.
7283 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7284 `Duration` additionally implements `*=` and `/=`][1.9ta].
7285 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7286 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7287 * [`Chain` implements `BufRead`][1.9ch].
7288 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7293 * [Cargo can now run concurrently][1.9cc].
7294 * [Top-level overrides allow specific revisions of crates to be
7295 overridden through the entire crate graph][1.9ct]. This is intended
7296 to make upgrades easier for large projects, by allowing crates to be
7297 forked temporarily until they've been upgraded and republished.
7298 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7299 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7300 on the commandline][1.9cf]. `rustc` arguments can also be specified
7301 in the `build.rustflags` configuration key.
7306 * [The time complexity of comparing variables for equivalence during type
7307 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7308 to major compilation time improvement in some scenarios.
7309 * [`ToString` is specialized for `str`, giving it the same performance
7310 as `to_owned`][1.9ts].
7311 * [Spawning processes with `Command::output` no longer creates extra
7313 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7314 for C-like enums][1.9cl].
7319 * [Passing the `--quiet` flag to a test runner will produce
7320 much-abbreviated output][1.9q].
7321 * The Rust Project now publishes std binaries for the
7322 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7323 `i586-pc-windows-msvc` targets.
7328 * [`std::sync::Once` is poisoned if its initialization function
7330 * [It is illegal to define methods with the same name in overlapping
7331 inherent `impl` blocks][1.9sn].
7332 * [`fn` item types are zero sized, and each `fn` names a unique
7333 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7334 `transmute` on a `fn` type will generate a warning for a few cycles,
7335 then will be converted to an error.
7336 * [Improvements to const evaluation may trigger new errors when integer
7337 literals are out of range][1.9ce].
7340 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7341 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7342 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7343 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7344 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7345 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7346 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7347 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7348 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7349 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7350 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7351 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7352 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7353 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7354 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7355 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7356 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7357 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7358 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7359 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7360 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7361 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7362 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7363 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7364 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7365 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7366 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7367 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7368 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7369 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7370 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7371 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7372 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7373 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7374 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7375 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7376 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7377 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7378 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7379 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7380 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7381 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7382 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7383 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7384 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7385 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7386 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7387 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7388 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7389 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7390 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7391 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7392 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7393 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7394 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7395 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7396 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7397 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7398 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7399 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7400 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7401 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7402 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7403 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7404 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7405 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7406 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7407 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7408 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7409 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7410 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7411 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7412 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7413 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7414 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7415 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7416 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7417 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7418 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7419 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7420 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7421 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7422 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7423 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7424 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7425 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7426 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7427 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7428 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7429 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7430 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7431 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7432 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7433 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7434 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7435 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7436 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7437 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7438 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7439 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7440 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7441 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7442 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7443 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7444 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7445 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7446 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7447 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7448 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7449 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7452 Version 1.8.0 (2016-04-14)
7453 ==========================
7458 * Rust supports overloading of compound assignment statements like
7459 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7460 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7461 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7463 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7464 addition to the non-braced form, `struct Foo;`. [RFC 218].
7470 * [`str::encode_utf16`] (renamed from `utf16_units`)
7471 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7474 * [`ptr::drop_in_place`]
7476 * [`time::SystemTime`]
7478 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7479 * [`Instant::elapsed`]
7480 * [`SystemTime::now`]
7481 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7482 * [`SystemTime::elapsed`]
7483 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7484 * [`SystemTimeError`]
7485 * [`SystemTimeError::duration`]
7486 * Various impls for `SystemTimeError`
7488 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7489 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7490 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7491 * [The `write!` and `writeln!` macros correctly emit errors if any of
7492 their arguments can't be formatted][1.8w].
7493 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7494 * [The Unix-specific `raw` modules, which contain a number of
7495 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7496 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7497 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7498 across platforms was making it difficult to implement `std`
7499 correctly. Those that need these definitions should use the `libc`
7501 * The Unix-specific `MetadataExt` traits, including
7502 `os::unix::fs::MetadataExt`, which expose values such as inode
7503 numbers [no longer return platform-specific types][1.8r], but
7504 instead return widened integers. [RFC 1415].
7505 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7506 * [Atomic loads and stores are not volatile][1.8a].
7507 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7512 * [Inlining hash functions lead to a 3% compile-time improvement in
7513 some workloads][1.8h].
7514 * When using jemalloc, its symbols are [unprefixed so that it
7515 overrides the libc malloc implementation][1.8h]. This means that for
7516 rustc, LLVM is now using jemalloc, which results in a 6%
7517 compile-time improvement on a specific workload.
7518 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7523 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7524 i686-pc-windows-msvc is now considered a tier-1 platform.
7525 * [The `--print targets` flag prints a list of supported targets][1.8t].
7526 * [The `--print cfg` flag prints the `cfg`s defined for the current
7528 * [`rustc` can be built with an new Cargo-based build system, written
7529 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7530 build system. To enable it configure with `configure --rustbuild`.
7531 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7532 variants while also indicating the total number of missing variants
7533 if more than 3][1.8m].
7534 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7535 * The Rust Project now publishes binary releases of the standard
7536 library for a number of tier-2 targets:
7537 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7538 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7539 `x86_64-rumprun-netbsd`. These can be installed with
7540 tools such as [multirust][1.8mr].
7545 * [`cargo init` creates a new Cargo project in the current
7546 directory][1.8ci]. It is otherwise like `cargo new`.
7547 * [Cargo has configuration keys for `-v` and
7548 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7549 `[term]` section of `.cargo/config`.
7550 * [Configuration keys that evaluate to strings or integers can be set
7551 via environment variables][1.8ce]. For example the `build.jobs` key
7552 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7553 precedence over config files.
7554 * [Target-specific dependencies support Rust `cfg` syntax for
7555 describing targets][1.8cfg] so that dependencies for multiple
7556 targets can be specified together. [RFC 1361].
7557 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7558 `RUSTDOC` take precedence over the `build.target-dir`,
7559 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7560 * [The child process tree is killed on Windows when Cargo is
7562 * [The `build.target` configuration value sets the target platform,
7563 like `--target`][1.8ct].
7568 * [Unstable compiler flags have been further restricted][1.8u]. Since
7569 1.0 `-Z` flags have been considered unstable, and other flags that
7570 were considered unstable additionally required passing `-Z
7571 unstable-options` to access. Unlike unstable language and library
7572 features though, these options have been accessible on the stable
7573 release channel. Going forward, *new unstable flags will not be
7574 available on the stable release channel*, and old unstable flags
7575 will warn about their usage. In the future, all unstable flags will
7576 be unavailable on the stable release channel.
7577 * [It is no longer possible to `match` on empty enum variants using
7578 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7579 * The Unix-specific `MetadataExt` traits, including
7580 `os::unix::fs::MetadataExt`, which expose values such as inode
7581 numbers [no longer return platform-specific types][1.8r], but
7582 instead return widened integers. [RFC 1415].
7583 * [Modules sourced from the filesystem cannot appear within arbitrary
7584 blocks, but only within other modules][1.8mf].
7585 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7586 * On Unix, [stack overflow triggers a runtime abort instead of a
7588 * [`Command::spawn` and its equivalents return an error if any of
7589 its command-line arguments contain interior `NUL`s][1.8n].
7590 * [Tuple and unit enum variants from other crates are in the type
7592 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7593 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7594 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7595 instead of `foo.lib`.
7598 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7599 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7600 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7601 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7602 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7603 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7604 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7605 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7606 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7607 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7608 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7609 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7610 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7611 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7612 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7613 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7614 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7615 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7616 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7617 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7618 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7619 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7620 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7621 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7622 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7623 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7624 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7625 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7626 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7627 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7628 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7629 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7630 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7631 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7632 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7633 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7634 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7635 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7636 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7637 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7638 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7639 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7640 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7641 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7642 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7643 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7644 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7645 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7646 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7647 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7648 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7649 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7650 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7651 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7652 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7653 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7654 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7655 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7656 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7657 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7660 Version 1.7.0 (2016-03-03)
7661 ==========================
7668 * [`Path::strip_prefix`] (renamed from relative_from)
7669 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7671 * [`Ipv4Addr::is_loopback`]
7672 * [`Ipv4Addr::is_private`]
7673 * [`Ipv4Addr::is_link_local`]
7674 * [`Ipv4Addr::is_multicast`]
7675 * [`Ipv4Addr::is_broadcast`]
7676 * [`Ipv4Addr::is_documentation`]
7678 * [`Ipv6Addr::is_unspecified`]
7679 * [`Ipv6Addr::is_loopback`]
7680 * [`Ipv6Addr::is_multicast`]
7683 * [`Vec::as_mut_slice`]
7685 * [`String::as_str`]
7686 * [`String::as_mut_str`]
7688 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7690 * `<[T]>::`[`sort_by_key`]
7691 * checked, saturated, and overflowing operations
7692 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7693 * [`i32::saturating_mul`]
7694 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7695 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7696 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7697 * [`u32::saturating_mul`]
7698 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7699 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7700 * and checked, saturated, and overflowing operations for other primitive types
7702 * [`ffi::IntoStringError`]
7703 * [`CString::into_string`]
7704 * [`CString::into_bytes`]
7705 * [`CString::into_bytes_with_nul`]
7706 * `From<CString> for Vec<u8>`
7708 * [`IntoStringError::into_cstring`]
7709 * [`IntoStringError::utf8_error`]
7710 * `Error for IntoStringError`
7712 * [`std::hash::BuildHasher`]
7713 * [`BuildHasher::Hasher`]
7714 * [`BuildHasher::build_hasher`]
7715 * [`std::hash::BuildHasherDefault`]
7716 * [`HashMap::with_hasher`]
7717 * [`HashMap::with_capacity_and_hasher`]
7718 * [`HashSet::with_hasher`]
7719 * [`HashSet::with_capacity_and_hasher`]
7720 * [`std::collections::hash_map::RandomState`]
7721 * [`RandomState::new`]
7722 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7723 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7724 from bytes is faster.
7725 * [The performance of `LineWriter` (and thus `io::stdout`) was
7726 improved by using `memchr` to search for newlines][1.7m].
7727 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7728 `f64` variants were stabilized previously.
7729 * [`BTreeMap` was rewritten to use less memory and improve the performance
7730 of insertion and iteration, the latter by as much as 5x][1.7bm].
7731 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7732 covariant over their contained type][1.7bt].
7733 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7734 over their contained type][1.7ll].
7735 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7737 * [`Any` is implemented for unsized types][1.7a].
7738 * [`Hash` is implemented for `Duration`][1.7h].
7743 * [When running tests with `--test`, rustdoc will pass `--cfg`
7744 arguments to the compiler][1.7dt].
7745 * [The compiler is built with RPATH information by default][1.7rpa].
7746 This means that it will be possible to run `rustc` when installed in
7747 unusual configurations without configuring the dynamic linker search
7749 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7750 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7751 over `LD_LIBRARY_PATH`.
7756 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7757 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7758 * [The `rerun-if-changed` build script directive no longer causes the
7759 build script to incorrectly run twice in certain scenarios][1.7rr].
7764 * Soundness fixes to the interactions between associated types and
7765 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7766 code that violates the new rules. This is a significant change that
7767 is known to break existing code, so it has emitted warnings for the
7768 new error cases since 1.4 to give crate authors time to adapt. The
7769 details of what is changing are subtle; read the RFC for more.
7770 * [Several bugs in the compiler's visibility calculations were
7771 fixed][1.7v]. Since this was found to break significant amounts of
7772 code, the new errors will be emitted as warnings for several release
7773 cycles, under the `private_in_public` lint.
7774 * Defaulted type parameters were accidentally accepted in positions
7775 that were not intended. In this release, [defaulted type parameters
7776 appearing outside of type definitions will generate a
7777 warning][1.7d], which will become an error in future releases.
7778 * [Parsing "." as a float results in an error instead of 0][1.7p].
7779 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7780 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7782 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7783 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7784 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7785 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7786 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7787 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7788 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7789 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7790 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7791 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7792 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7793 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7794 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7795 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7796 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7797 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7798 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7799 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7800 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7801 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7802 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7803 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7804 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7805 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7806 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7807 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7808 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7809 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7810 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7811 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7812 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7813 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7814 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7815 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7816 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7817 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7818 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7819 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7820 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7821 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7822 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7823 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7824 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7825 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7826 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7827 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7828 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7829 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7830 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7831 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7832 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7833 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7834 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7835 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7836 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7837 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7838 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7839 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7840 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7841 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7842 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7843 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7844 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7845 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7846 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7847 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7848 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7849 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7850 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7851 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7852 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7853 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7854 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7855 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7856 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7857 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7858 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7859 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7860 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7863 Version 1.6.0 (2016-01-21)
7864 ==========================
7869 * The `#![no_std]` attribute causes a crate to not be linked to the
7870 standard library, but only the [core library][1.6co], as described
7871 in [RFC 1184]. The core library defines common types and traits but
7872 has no platform dependencies whatsoever, and is the basis for Rust
7873 software in environments that cannot support a full port of the
7874 standard library, such as operating systems. Most of the core
7875 library is now stable.
7881 [`Read::read_exact`],
7882 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7883 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7884 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7885 [`os::unix::fs::DirBuilderExt`],
7886 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7887 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7888 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7889 [`collections::hash_map::Drain`],
7890 [`collections::hash_map::HashMap::drain`],
7891 [`collections::hash_set::Drain`],
7892 [`collections::hash_set::HashSet::drain`],
7893 [`collections::binary_heap::Drain`],
7894 [`collections::binary_heap::BinaryHeap::drain`],
7895 [`Vec::extend_from_slice`] (renamed from `push_all`),
7896 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7897 [`RwLock::into_inner`],
7898 [`Iterator::min_by_key`] (renamed from `min_by`),
7899 [`Iterator::max_by_key`] (renamed from `max_by`).
7900 * The [core library][1.6co] is stable, as are most of its APIs.
7901 * [The `assert_eq!` macro supports arguments that don't implement
7902 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7904 * Several timer functions that take duration in milliseconds [are
7905 deprecated in favor of those that take `Duration`][1.6ms]. These
7906 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7907 `thread::park_timeout_ms`.
7908 * The algorithm by which `Vec` reserves additional elements was
7909 [tweaked to not allocate excessive space][1.6a] while still growing
7911 * `From` conversions are [implemented from integers to floats][1.6f]
7912 in cases where the conversion is lossless. Thus they are not
7913 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7914 or `f64`. They are also not implemented for `isize` and `usize`
7915 because the implementations would be platform-specific. `From` is
7916 also implemented from `f32` to `f64`.
7917 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7918 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7919 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7920 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7922 * Sorting slices that are already sorted [is 50% faster in some
7928 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7929 * Cargo build scripts can specify their dependencies by emitting the
7930 [`rerun-if-changed`][1.6rr] key.
7931 * crates.io will reject publication of crates with dependencies that
7932 have a wildcard version constraint. Crates with wildcard
7933 dependencies were seen to cause a variety of problems, as described
7934 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7936 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7937 release folder. A variety of artifacts that Cargo failed to clean
7938 are now correctly deleted.
7943 * The `unreachable_code` lint [warns when a function call's argument
7945 * The parser indicates [failures that may be caused by
7946 confusingly-similar Unicode characters][1.6uc]
7947 * Certain macro errors [are reported at definition time][1.6m], not
7953 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7954 environment variable when locating crates. This was a pre-cargo
7955 feature for integrating with the package manager that was
7956 accidentally never removed.
7957 * [A number of bugs were fixed in the privacy checker][1.6p] that
7958 could cause previously-accepted code to break.
7959 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7960 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7961 struct pattern syntax (`Foo(..)`) can no longer be used to match
7962 unit structs. This is a warning now, but will become an error in
7963 future releases. Patterns that share the same name as a const are
7965 * A bug was fixed that causes [rustc not to apply default type
7966 parameters][1.6xc] when resolving certain method implementations of
7967 traits defined in other crates.
7969 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7970 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7971 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7972 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7973 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7974 [1.6co]: http://doc.rust-lang.org/core/index.html
7975 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7976 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7977 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7978 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7979 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7980 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7981 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7982 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7983 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7984 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7985 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7986 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7987 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7988 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7989 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7990 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7991 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7992 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7993 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7994 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7995 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7996 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7997 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7998 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7999 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8000 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8001 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8002 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8003 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8004 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8005 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8006 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8007 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8008 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8009 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8010 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8011 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8012 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8013 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8014 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8015 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8018 Version 1.5.0 (2015-12-10)
8019 ==========================
8021 * ~700 changes, numerous bugfixes
8027 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8028 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8029 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8030 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8031 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8032 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8033 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8034 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8035 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8036 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8037 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8038 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8039 [`Path::read_link`], [`Path::symlink_metadata`],
8040 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8041 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8042 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8043 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8044 [`slice::split_first_mut`], [`slice::split_first`],
8045 [`slice::split_last_mut`], [`slice::split_last`],
8046 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8047 [`str::MatchIndices`], [`str::RMatchIndices`],
8048 [`str::match_indices`], [`str::rmatch_indices`],
8049 [`str::slice_mut_unchecked`], [`string::ParseError`].
8050 * Rust applications hosted on crates.io can be installed locally to
8051 `~/.cargo/bin` with the [`cargo install`] command. Among other
8052 things this makes it easier to augment Cargo with new subcommands:
8053 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8054 invoked as `cargo foo`.
8055 * Crates with wildcard (`*`) dependencies will [emit warnings when
8056 published][1.5w]. In 1.6 it will no longer be possible to publish
8057 crates with wildcard dependencies.
8062 * The rules determining when a particular lifetime must outlive
8063 a particular value (known as '[dropck]') have been [modified
8064 to not rely on parametricity][1.5p].
8065 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8066 and `Arc`][1.5a]. Because these smart pointer types implement
8067 `Deref`, this causes breakage in cases where the interior type
8068 contains methods of the same name.
8069 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8070 that they could drop their content. Soundness fix.
8071 * All method invocations are [properly checked][1.5wf1] for
8072 [well-formedness][1.5wf2]. Soundness fix.
8073 * Traits whose supertraits contain `Self` are [not object
8074 safe][1.5o]. Soundness fix.
8075 * Target specifications support a [`no_default_libraries`][1.5nd]
8076 setting that controls whether `-nodefaultlibs` is passed to the
8077 linker, and in turn the `is_like_windows` setting no longer affects
8078 the `-nodefaultlibs` flag.
8079 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8080 * The `#[inline]` and `#[repr]` attributes [can only appear
8081 in valid locations][1.5at].
8082 * Native libraries linked from the local crate are [passed to
8083 the linker before native libraries from upstream crates][1.5nl].
8084 * Two rarely-used attributes, `#[no_debug]` and
8085 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8086 * Negation of unsigned integers, which has been a warning for
8087 several releases, [is now behind a feature gate and will
8088 generate errors][1.5nu].
8089 * The parser accidentally accepted visibility modifiers on
8090 enum variants, a bug [which has been fixed][1.5ev].
8091 * [A bug was fixed that allowed `use` statements to import unstable
8097 * When evaluating expressions at compile-time that are not
8098 compile-time constants (const-evaluating expressions in non-const
8099 contexts), incorrect code such as overlong bitshifts and arithmetic
8100 overflow will [generate a warning instead of an error][1.5ce],
8101 delaying the error until runtime. This will allow the
8102 const-evaluator to be expanded in the future backwards-compatibly.
8103 * The `improper_ctypes` lint [no longer warns about using `isize` and
8104 `usize` in FFI][1.5ict].
8109 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8111 * `Default` is [implemented for mutable slices][1.5d].
8112 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8113 * There are now `From` conversions [between floating point
8114 types][1.5f] where the conversions are lossless.
8115 * There are now `From` conversions [between integer types][1.5i] where
8116 the conversions are lossless.
8117 * [`fs::Metadata` implements `Clone`][1.5fs].
8118 * The `parse` method [accepts a leading "+" when parsing
8120 * [`AsMut` is implemented for `Vec`][1.5am].
8121 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8122 been optimized][1.5cf] and no longer rely on the default impl.
8123 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8124 `unsafe extern "C"` function types now [implement `Clone`,
8125 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8126 `fmt::Debug` for up to 12 arguments][1.5fp].
8127 * [Dropping `Vec`s is much faster in unoptimized builds when the
8128 element types don't implement `Drop`][1.5dv].
8129 * A bug that caused in incorrect behavior when [combining `VecDeque`
8130 with zero-sized types][1.5vdz] was resolved.
8131 * [`PartialOrd` for slices is faster][1.5po].
8136 * [Crate metadata size was reduced by 20%][1.5md].
8137 * [Improvements to code generation reduced the size of libcore by 3.3
8138 MB and rustc's memory usage by 18MB][1.5m].
8139 * [Improvements to deref translation increased performance in
8140 unoptimized builds][1.5dr].
8141 * Various errors in trait resolution [are deduplicated to only be
8142 reported once][1.5te].
8143 * Rust has preliminary [support for rumprun kernels][1.5rr].
8144 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8146 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8147 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8148 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8149 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8150 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8151 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8152 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8153 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8154 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8155 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8156 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8157 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8158 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8159 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8160 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8161 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8162 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8163 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8164 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8165 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8166 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8167 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8168 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8169 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8170 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8171 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8172 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8173 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8174 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8175 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8176 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8177 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8178 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8179 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8180 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8181 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8182 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8183 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8184 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8185 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8186 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8187 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8188 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8189 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8190 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8191 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8192 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8193 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8194 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8195 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8196 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8197 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8198 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8199 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8200 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8201 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8202 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8203 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8204 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8205 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8206 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8207 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8208 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8209 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8210 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8211 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8212 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8213 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8214 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8215 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8216 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8217 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8218 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8219 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8220 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8221 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8222 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8223 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8224 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8225 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8226 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8227 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8228 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8229 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8230 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8231 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8232 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8233 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8234 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8236 Version 1.4.0 (2015-10-29)
8237 ==========================
8239 * ~1200 changes, numerous bugfixes
8244 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8245 GNU) are now supported and recommended for use.
8250 * [Several changes have been made to fix type soundness and improve
8251 the behavior of associated types][sound]. See [RFC 1214]. Although
8252 we have mostly introduced these changes as warnings this release, to
8253 become errors next release, there are still some scenarios that will
8254 see immediate breakage.
8255 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8256 line breaks in addition to `\n`][crlf].
8257 * [Loans of `'static` lifetime extend to the end of a function][stat].
8258 * [`str::parse` no longer introduces avoidable rounding error when
8259 parsing floating point numbers. Together with earlier changes to
8260 float formatting/output, "round trips" like f.to_string().parse()
8261 now preserve the value of f exactly. Additionally, leading plus
8262 signs are now accepted][fp3].
8268 * `use` statements that import multiple items [can now rename
8269 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8270 * [Binops work correctly on fat pointers][binfat].
8271 * `pub extern crate`, which does not behave as expected, [issues a
8272 warning][pec] until a better solution is found.
8277 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8278 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8279 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8280 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8281 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8282 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8283 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8284 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8285 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8286 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8287 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8288 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8289 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8290 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8291 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8292 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8293 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8294 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8296 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8297 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8298 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8299 `f64::from_str_radix`.
8300 * [Reverse-searching strings is faster with the 'two-way'
8302 * [`std::io::copy` allows `?Sized` arguments][cc].
8303 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8304 [override `count`, `nth` and `last` with an O(1)
8305 implementation][it].
8306 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8307 * [`IntoRawFd` has been added to the Unix-specific prelude,
8308 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8310 * [`Extend<String>` and `FromIterator<String` are both implemented for
8312 * [`IntoIterator` is implemented for references to `Option` and
8314 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8315 Copy`][ext] as part of [RFC 839]. This will cause type inference
8316 breakage in rare situations.
8317 * [`BinaryHeap` implements `Debug`][bh2].
8318 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8320 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8321 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8322 * [String comparison is faster][faststr].
8323 * `&mut T` where `T: std::fmt::Write` [also implements
8324 `std::fmt::Write`][mutw].
8325 * [A stable regression in `VecDeque::push_back` and other
8326 capacity-altering methods that caused panics for zero-sized types
8328 * [Function pointers implement traits for up to 12 parameters][fp2].
8333 * The compiler [no longer uses the 'morestack' feature to prevent
8334 stack overflow][mm]. Instead it uses guard pages and stack
8335 probes (though stack probes are not yet implemented on any platform
8337 * [The compiler matches traits faster when projections are involved][p].
8338 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8340 * [Cargo now displays useful information about what its doing during
8341 `cargo update`][cu].
8343 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8344 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8345 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8346 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8347 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8348 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8349 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8350 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8351 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8352 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8353 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8354 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8355 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8356 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8357 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8358 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8359 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8360 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8361 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8362 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8363 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8364 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8365 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8366 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8367 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8368 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8369 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8370 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8371 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8372 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8373 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8374 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8375 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8376 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8377 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8378 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8379 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8380 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8381 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8382 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8383 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8384 [bh2]: https://github.com/rust-lang/rust/pull/28156
8385 [binfat]: https://github.com/rust-lang/rust/pull/28270
8386 [bm]: https://github.com/rust-lang/rust/pull/28197
8387 [cc]: https://github.com/rust-lang/rust/pull/27531
8388 [crlf]: https://github.com/rust-lang/rust/pull/28034
8389 [cu]: https://github.com/rust-lang/cargo/pull/1931
8390 [d]: https://github.com/rust-lang/rust/pull/27825
8391 [dep]: https://github.com/rust-lang/rust/pull/28339
8392 [es]: https://github.com/rust-lang/rust/pull/27956
8393 [ext]: https://github.com/rust-lang/rust/pull/28094
8394 [faststr]: https://github.com/rust-lang/rust/pull/28338
8395 [ffi]: https://github.com/rust-lang/rust/pull/28779
8396 [fp]: https://github.com/rust-lang/rust/pull/28268
8397 [fp2]: https://github.com/rust-lang/rust/pull/28560
8398 [fp3]: https://github.com/rust-lang/rust/pull/27307
8399 [i]: https://github.com/rust-lang/rust/pull/27451
8400 [into2]: https://github.com/rust-lang/rust/pull/28039
8401 [it]: https://github.com/rust-lang/rust/pull/27652
8402 [mm]: https://github.com/rust-lang/rust/pull/27338
8403 [mutw]: https://github.com/rust-lang/rust/pull/28368
8404 [sound]: https://github.com/rust-lang/rust/pull/27641
8405 [p]: https://github.com/rust-lang/rust/pull/27866
8406 [pec]: https://github.com/rust-lang/rust/pull/28486
8407 [pr]: https://github.com/rust-lang/rust/pull/27896
8408 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8409 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8410 [s]: https://github.com/rust-lang/rust/pull/27474
8411 [stab]: https://github.com/rust-lang/rust/pull/28339
8412 [stat]: https://github.com/rust-lang/rust/pull/28321
8413 [vd]: https://github.com/rust-lang/rust/pull/28494
8415 Version 1.3.0 (2015-09-17)
8416 ==============================
8418 * ~900 changes, numerous bugfixes
8423 * The [new object lifetime defaults][nold] have been [turned
8424 on][nold2] after a cycle of warnings about the change. Now types
8425 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8426 being interpreted as `&'a Box<Trait+'a>` to `&'a
8427 Box<Trait+'static>`.
8428 * [The Rustonomicon][nom] is a new book in the official documentation
8429 that dives into writing unsafe Rust.
8430 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8431 timekeeping is employed by other std APIs, as well as out-of-tree
8437 * The [new object lifetime defaults][nold] have been [turned
8438 on][nold2] after a cycle of warnings about the change.
8439 * There is a known [regression][lr] in how object lifetime elision is
8440 interpreted, the proper solution for which is undetermined.
8441 * The `#[prelude_import]` attribute, an internal implementation
8442 detail, was accidentally stabilized previously. [It has been put
8443 behind the `prelude_import` feature gate][pi]. This change is
8444 believed to break no existing code.
8445 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8446 [more sane for dynamically sized types][dst3]. Code that relied on
8447 the previous behavior is thought to be broken.
8448 * The `dropck` rules, which checks that destructors can't access
8449 destroyed values, [have been updated][dropck] to match the
8450 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8451 cause some previously-compiling code to no longer build.
8456 * The [new object lifetime defaults][nold] have been [turned
8457 on][nold2] after a cycle of warnings about the change.
8458 * Semicolons may [now follow types and paths in
8459 macros](https://github.com/rust-lang/rust/pull/27000).
8460 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8461 [more sane for dynamically sized types][dst3]. Code that relied on
8462 the previous behavior is not known to exist, and suspected to be
8464 * `'static` variables [may now be recursive][st].
8465 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8466 implementations correctly.
8467 * The `dropck` rules, which checks that destructors can't access
8468 destroyed values, [have been updated][dropck] to match the
8474 * The [`Duration`] API, [has been stabilized][ds], as well as the
8475 `std::time` module, which presently contains only `Duration`.
8476 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8477 * The owned C string, [`CString`], implements [`Borrow`] and the
8478 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8479 these allow C strings to be borrowed and cloned in generic code.
8480 * [`CStr`] implements [`Debug`].
8481 * [`AtomicPtr`] implements [`Debug`].
8482 * [`Error`] trait objects [can be downcast to their concrete types][e]
8483 in many common configurations, using the [`is`], [`downcast`],
8484 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8486 * Searching for substrings now [employs the two-way algorithm][search]
8487 instead of doing a naive search. This gives major speedups to a
8488 number of methods, including [`contains`][sc], [`find`][sf],
8489 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8490 [`ends_with`][sew] are also faster.
8491 * The performance of `PartialEq` for slices is [much faster][ps].
8492 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8493 is overridden and optimized by the implementations for scalars.
8494 * The [`Hasher`] trait now has a number of specialized `write_*`
8495 methods for primitive types, for efficiency.
8496 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8497 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8498 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8499 of [`std::error::Error::cause`][iec] also delegates to the inner
8501 * [`process::Child`][pc] gained the [`id`] method, which returns a
8502 `u32` representing the platform-specific process identifier.
8503 * The [`connect`] method on slices is deprecated, replaced by the new
8504 [`join`] method (note that both of these are on the *unstable*
8505 [`SliceConcatExt`] trait, but through the magic of the prelude are
8506 available to stable code anyway).
8507 * The [`Div`] operator is implemented for [`Wrapping`] types.
8508 * [`DerefMut` is implemented for `String`][dms].
8509 * Performance of SipHash (the default hasher for `HashMap`) is
8510 [better for long data][sh].
8511 * [`AtomicPtr`] implements [`Send`].
8512 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8513 are now [specialized to use uninitialized buffers for increased
8515 * Lifetime parameters of foreign functions [are now resolved
8521 * Rust can now, with some coercion, [produce programs that run on
8522 Windows XP][xp], though XP is not considered a supported platform.
8523 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8524 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8525 recommended for use in 1.3, though should be fully-functional
8526 in the [64-bit 1.4 beta][b14].
8527 * On Fedora-based systems installation will [properly configure the
8528 dynamic linker][fl].
8529 * The compiler gained many new extended error descriptions, which can
8530 be accessed with the `--explain` flag.
8531 * The `dropck` pass, which checks that destructors can't access
8532 destroyed values, [has been rewritten][dropck]. This fixes some
8533 soundness holes, and as such will cause some previously-compiling
8534 code to no longer build.
8535 * `rustc` now uses [LLVM to write archive files where possible][ar].
8536 Eventually this will eliminate the compiler's dependency on the ar
8538 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8539 supported FreeBSD on x86_64).
8540 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8541 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8543 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8544 will kill the process instead of leaking][nlp].
8546 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8547 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8548 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8549 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8550 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8551 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8552 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8553 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8554 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8555 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8556 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8557 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8558 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8559 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8560 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8561 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8562 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8563 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8564 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8565 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8566 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8567 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8568 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8569 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8570 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8571 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8572 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8573 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8574 [ar]: https://github.com/rust-lang/rust/pull/26926
8575 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8576 [dms]: https://github.com/rust-lang/rust/pull/26241
8577 [dropck]: https://github.com/rust-lang/rust/pull/27261
8578 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8579 [ds]: https://github.com/rust-lang/rust/pull/26818
8580 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8581 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8582 [dst3]: https://github.com/rust-lang/rust/pull/27351
8583 [e]: https://github.com/rust-lang/rust/pull/24793
8584 [f]: https://github.com/rust-lang/rust/pull/26588
8585 [fb]: https://github.com/rust-lang/rust/pull/26959
8586 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8587 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8588 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8589 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8590 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8591 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8592 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8593 [lic]: https://github.com/rust-lang/rust/pull/26583
8594 [lnu]: https://github.com/rust-lang/rust/pull/27026
8595 [lr]: https://github.com/rust-lang/rust/issues/27248
8596 [lum]: https://github.com/rust-lang/rust/pull/26378
8597 [lur]: https://github.com/rust-lang/rust/pull/26783
8598 [nlp]: https://github.com/rust-lang/rust/pull/27176
8599 [nold2]: https://github.com/rust-lang/rust/pull/27045
8600 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8601 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8602 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8603 [pi]: https://github.com/rust-lang/rust/pull/26699
8604 [ps]: https://github.com/rust-lang/rust/pull/26884
8605 [rte]: https://github.com/rust-lang/rust/pull/26950
8606 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8607 [search]: https://github.com/rust-lang/rust/pull/26327
8608 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8609 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8610 [sh]: https://github.com/rust-lang/rust/pull/27280
8611 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8612 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8613 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8614 [st]: https://github.com/rust-lang/rust/pull/26630
8615 [win1]: https://github.com/rust-lang/rust/pull/26569
8616 [win2]: https://github.com/rust-lang/rust/pull/26741
8617 [win3]: https://github.com/rust-lang/rust/pull/26741
8618 [win4]: https://github.com/rust-lang/rust/pull/27210
8619 [xp]: https://github.com/rust-lang/rust/pull/26569
8621 Version 1.2.0 (2015-08-07)
8622 ==========================
8624 * ~1200 changes, numerous bugfixes
8629 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8630 like `Rc` to contain types without a fixed size, arrays and trait
8631 objects, finally enabling use of `Rc<[T]>` and completing the
8632 implementation of DST.
8633 * [Parallel codegen][parcodegen] is now working again, which can
8634 substantially speed up large builds in debug mode; It also gets
8635 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8636 jobs). It's not enabled by default, but will be "in the near
8637 future". It can be activated with the `-C codegen-units=N` flag to
8639 * This is the first release with [experimental support for linking
8640 with the MSVC linker and lib C on Windows (instead of using the GNU
8641 variants via MinGW)][win]. It is yet recommended only for the most
8642 intrepid Rustaceans.
8643 * Benchmark compilations are showing a 30% improvement in
8644 bootstrapping over 1.1.
8649 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8650 unicode case mapping, which is a previously-planned change in
8651 behavior and considered a bugfix.
8652 * [`mem::align_of`] now specifies [the *minimum alignment* for
8653 T][align], which is usually the alignment programs are interested
8654 in, and the same value reported by clang's
8655 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8657 * [The `#[packed]` attribute is no longer silently accepted by the
8658 compiler][packed]. This attribute did nothing and code that
8659 mentioned it likely did not work as intended.
8660 * Associated type defaults are [now behind the
8661 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8662 defaults *did not work*, but could be mentioned syntactically. As
8663 such this breakage has minimal impact.
8668 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8669 matching against dereferenceable values.
8674 * The [`Extend`] trait, which grows a collection from an iterator, is
8675 implemented over iterators of references, for `String`, `Vec`,
8676 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8677 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8678 * The [`iter::once`] function returns an iterator that yields a single
8679 element, and [`iter::empty`] returns an iterator that yields no
8681 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8682 over substring matches.
8683 * [`Cell`] and [`RefCell`] both implement `Eq`.
8684 * A number of methods for wrapping arithmetic are added to the
8685 integral types, [`wrapping_div`], [`wrapping_rem`],
8686 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8687 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8688 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8689 type.. It is illegal for the default arithmetic operations in Rust
8690 to overflow; the desire to wrap must be explicit.
8691 * The `{:#?}` formatting specifier [displays the alternate,
8692 pretty-printed][debugfmt] form of the `Debug` formatter. This
8693 feature was actually introduced prior to 1.0 with little
8695 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8696 for writing data to formatted strings, similar to [`io::Write`].
8697 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8698 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8699 are used by code generators to emit implementations of [`Debug`].
8700 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8701 methods that convert case, following Unicode case mapping.
8702 * It is now easier to handle poisoned locks. The [`PoisonError`]
8703 type, returned by failing lock operations, exposes `into_inner`,
8704 `get_ref`, and `get_mut`, which all give access to the inner lock
8705 guard, and allow the poisoned lock to continue to operate. The
8706 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8707 poisoned lock without attempting to take the lock.
8708 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8709 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8710 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8711 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8713 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8719 * `rustc` employs smarter heuristics for guessing at [typos].
8720 * `rustc` emits more efficient code for [no-op conversions between
8721 unsafe pointers][nop].
8722 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8723 resulting in faster compile times and smaller code.
8725 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8726 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8727 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8728 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8729 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8730 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8731 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8732 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8733 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8734 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8735 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8736 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8737 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8738 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8739 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8740 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8741 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8742 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8743 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8744 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8745 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8746 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8747 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8748 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8749 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8750 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8751 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8752 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8753 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8754 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8755 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8756 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8757 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8758 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8759 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8760 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8761 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8762 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8763 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8764 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8765 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8766 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8767 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8768 [align]: https://github.com/rust-lang/rust/pull/25646
8769 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8770 [typos]: https://github.com/rust-lang/rust/pull/26087
8771 [nop]: https://github.com/rust-lang/rust/pull/26336
8772 [fat]: https://github.com/rust-lang/rust/pull/26411
8773 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8774 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8775 [packed]: https://github.com/rust-lang/rust/pull/25541
8776 [ad]: https://github.com/rust-lang/rust/pull/27382
8777 [win]: https://github.com/rust-lang/rust/pull/25350
8779 Version 1.1.0 (2015-06-25)
8780 =========================
8782 * ~850 changes, numerous bugfixes
8787 * The [`std::fs` module has been expanded][fs] to expand the set of
8788 functionality exposed:
8789 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8790 don't incur a syscall on some platforms.
8791 * A `symlink_metadata` function has been added.
8792 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8793 access to all underlying information.
8794 * The compiler now contains extended explanations of many errors. When an error
8795 with an explanation occurs the compiler suggests using the `--explain` flag
8796 to read the explanation. Error explanations are also [available online][err-index].
8797 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8798 well as other work, the time to bootstrap the compiler decreased by
8804 * The [`str::split_whitespace`] method splits a string on unicode
8805 whitespace boundaries.
8806 * On both Windows and Unix, new extension traits provide conversion of
8807 I/O types to and from the underlying system handles. On Unix, these
8808 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8809 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8810 `TcpListener`, and `UpdSocket`. Further implementations for
8811 `std::process` will be stabilized later.
8812 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8813 Windows, symlinks can be created with
8814 `std::os::windows::symlink_dir` and
8815 `std::os::windows::symlink_file`.
8816 * The `mpsc::Receiver` type can now be converted into an iterator with
8817 `into_iter` on the [`IntoIterator`] trait.
8818 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8819 implementation of the [`From`] trait.
8820 * The `Debug` implementation for `RangeFull` [creates output that is
8821 more consistent with other implementations][rf].
8822 * [`Debug` is implemented for `File`][file].
8823 * The `Default` implementation for `Arc` [no longer requires `Sync +
8825 * [The `Iterator` methods `count`, `nth`, and `last` have been
8826 overridden for slices to have O(1) performance instead of O(n)][si].
8827 * Incorrect handling of paths on Windows has been improved in both the
8828 compiler and the standard library.
8829 * [`AtomicPtr` gained a `Default` implementation][ap].
8830 * In accordance with Rust's policy on arithmetic overflow `abs` now
8831 [panics on overflow when debug assertions are enabled][abs].
8832 * The [`Cloned`] iterator, which was accidentally left unstable for
8833 1.0 [has been stabilized][c].
8834 * The [`Incoming`] iterator, which iterates over incoming TCP
8835 connections, and which was accidentally unnamable in 1.0, [is now
8836 properly exported][inc].
8837 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8838 `sift_up` or `sift_down` panic][bh].
8839 * The [`split_off`] method of `LinkedList` [no longer corrupts
8840 the list in certain scenarios][ll].
8845 * Type checking performance [has improved notably][sk] with
8846 [multiple improvements][pre].
8847 * The compiler [suggests code changes][ch] for more errors.
8848 * rustc and it's build system have experimental support for [building
8849 toolchains against MUSL][m] instead of glibc on Linux.
8850 * The compiler defines the `target_env` cfg value, which is used for
8851 distinguishing toolchains that are otherwise for the same
8852 platform. Presently this is set to `gnu` for common GNU Linux
8853 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8854 * The [`cargo rustc`][crc] command invokes a build with custom flags
8856 * [Android executables are always position independent][pie].
8857 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8860 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8861 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8862 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8863 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8864 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8865 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8866 [rf]: https://github.com/rust-lang/rust/pull/24491
8867 [err-index]: https://doc.rust-lang.org/error-index.html
8868 [sk]: https://github.com/rust-lang/rust/pull/24615
8869 [pre]: https://github.com/rust-lang/rust/pull/25323
8870 [file]: https://github.com/rust-lang/rust/pull/24598
8871 [ch]: https://github.com/rust-lang/rust/pull/24683
8872 [arc]: https://github.com/rust-lang/rust/pull/24695
8873 [si]: https://github.com/rust-lang/rust/pull/24701
8874 [ap]: https://github.com/rust-lang/rust/pull/24834
8875 [m]: https://github.com/rust-lang/rust/pull/24777
8876 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8877 [crc]: https://github.com/rust-lang/cargo/pull/1568
8878 [pie]: https://github.com/rust-lang/rust/pull/24953
8879 [abs]: https://github.com/rust-lang/rust/pull/25441
8880 [c]: https://github.com/rust-lang/rust/pull/25496
8881 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8882 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8883 [inc]: https://github.com/rust-lang/rust/pull/25522
8884 [bh]: https://github.com/rust-lang/rust/pull/25856
8885 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8886 [ll]: https://github.com/rust-lang/rust/pull/26022
8887 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8888 [drop]: https://github.com/rust-lang/rust/pull/24935
8890 Version 1.0.0 (2015-05-15)
8891 ========================
8893 * ~1500 changes, numerous bugfixes
8898 * The vast majority of the standard library is now `#[stable]`. It is
8899 no longer possible to use unstable features with a stable build of
8901 * Many popular crates on [crates.io] now work on the stable release
8903 * Arithmetic on basic integer types now [checks for overflow in debug
8909 * Several [restrictions have been added to trait coherence][coh] in
8910 order to make it easier for upstream authors to change traits
8911 without breaking downstream code.
8912 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8913 improve error messages and macro behavior. For example, `0b1234` is
8914 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8915 * Trait bounds [are always invariant][inv], eliminating the need for
8916 the `PhantomFn` and `MarkerTrait` lang items, which have been
8918 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8919 "foo" as bar` syntax has been replaced with `extern crate foo as
8920 bar`, and Cargo now automatically translates "-" in *package* names
8921 to underscore for the crate name.
8922 * [Lifetime shadowing is an error][lt].
8923 * [`Send` no longer implies `'static`][send-rfc].
8924 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8925 `MyType::default()`.
8926 * Primitive types [now have inherent methods][prim-inherent],
8927 obviating the need for extension traits like `SliceExt`.
8928 * Methods with `Self: Sized` in their `where` clause are [considered
8929 object-safe][self-sized], allowing many extension traits like
8930 `IteratorExt` to be merged into the traits they extended.
8931 * You can now [refer to associated types][assoc-where] whose
8932 corresponding trait bounds appear only in a `where` clause.
8933 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8934 like `Send` and `Sync` are now library-defined.
8935 * A [Reflect trait][reflect] was introduced, which means that
8936 downcasting via the `Any` trait is effectively limited to concrete
8937 types. This helps retain the potentially-important "parametricity"
8938 property: generic code cannot behave differently for different type
8939 arguments except in minor ways.
8940 * The `unsafe_destructor` feature is now deprecated in favor of the
8941 [new `dropck`][dropck]. This change is a major reduction in unsafe
8947 * The `thread_local` module [has been renamed to `std::thread`][th].
8948 * The methods of `IteratorExt` [have been moved to the `Iterator`
8950 * Several traits that implement Rust's conventions for type
8951 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8952 [centralized in the `std::convert` module][con].
8953 * The `FromError` trait [was removed in favor of `From`][fe].
8954 * The basic sleep function [has moved to
8955 `std::thread::sleep_ms`][slp].
8956 * The `splitn` function now takes an `n` parameter that represents the
8957 number of items yielded by the returned iterator [instead of the
8958 number of 'splits'][spl].
8959 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8960 * [Derived implementations of `PartialOrd` now order enums according
8961 to their explicitly-assigned discriminants][po].
8962 * [Methods for searching strings are generic over `Pattern`s][pat],
8963 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8965 * [In method resolution, object methods are resolved before inherent
8967 * [`String::from_str` has been deprecated in favor of the `From` impl,
8968 `String::from`][sf].
8969 * [`io::Error` implements `Sync`][ios].
8970 * [The `words` method on `&str` has been replaced with
8971 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8973 * The new path and IO modules are complete and `#[stable]`. This
8974 was the major library focus for this cycle.
8975 * The path API was [revised][path-normalize] to normalize `.`,
8976 adjusting the tradeoffs in favor of the most common usage.
8977 * A large number of remaining APIs in `std` were also stabilized
8978 during this cycle; about 75% of the non-deprecated API surface
8980 * The new [string pattern API][string-pattern] landed, which makes
8981 the string slice API much more internally consistent and flexible.
8982 * A new set of [generic conversion traits][conversion] replaced
8983 many existing ad hoc traits.
8984 * Generic numeric traits were [completely removed][num-traits]. This
8985 was made possible thanks to inherent methods for primitive types,
8986 and the removal gives maximal flexibility for designing a numeric
8987 hierarchy in the future.
8988 * The `Fn` traits are now related via [inheritance][fn-inherit]
8989 and provide ergonomic [blanket implementations][fn-blanket].
8990 * The `Index` and `IndexMut` traits were changed to
8991 [take the index by value][index-value], enabling code like
8992 `hash_map["string"]` to work.
8993 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8994 `Copy` data is known to be `Clone` as well.
8999 * Many errors now have extended explanations that can be accessed with
9000 the `--explain` flag to `rustc`.
9001 * Many new examples have been added to the standard library
9003 * rustdoc has received a number of improvements focused on completion
9005 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9006 * Much headway was made on ecosystem-wide CI, making it possible
9007 to [compare builds for breakage][ci-compare].
9010 [crates.io]: http://crates.io
9011 [clo]: https://github.com/rust-lang/rust/pull/24034
9012 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9013 [con]: https://github.com/rust-lang/rust/pull/23875
9014 [cr]: https://github.com/rust-lang/rust/pull/23419
9015 [fe]: https://github.com/rust-lang/rust/pull/23879
9016 [ie]: https://github.com/rust-lang/rust/pull/23300
9017 [inv]: https://github.com/rust-lang/rust/pull/23938
9018 [ios]: https://github.com/rust-lang/rust/pull/24133
9019 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9020 [lt]: https://github.com/rust-lang/rust/pull/24057
9021 [meth]: https://github.com/rust-lang/rust/pull/24056
9022 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9023 [po]: https://github.com/rust-lang/rust/pull/24270
9024 [sf]: https://github.com/rust-lang/rust/pull/24517
9025 [slp]: https://github.com/rust-lang/rust/pull/23949
9026 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9027 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9028 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9029 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9030 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9031 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9032 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9033 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9034 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9035 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9036 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9037 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9038 [reflect]: https://github.com/rust-lang/rust/pull/23712
9039 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9040 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9041 [index-value]: https://github.com/rust-lang/rust/pull/23601
9042 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9043 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9044 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9045 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9046 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9047 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9050 Version 1.0.0-alpha.2 (2015-02-20)
9051 =====================================
9053 * ~1300 changes, numerous bugfixes
9057 * The various I/O modules were [overhauled][io-rfc] to reduce
9058 unnecessary abstractions and provide better interoperation with
9059 the underlying platform. The old `io` module remains temporarily
9061 * The standard library now [participates in feature gating][feat],
9062 so use of unstable libraries now requires a `#![feature(...)]`
9063 attribute. The impact of this change is [described on the
9064 forum][feat-forum]. [RFC][feat-rfc].
9068 * `for` loops [now operate on the `IntoIterator` trait][into],
9069 which eliminates the need to call `.iter()`, etc. to iterate
9070 over collections. There are some new subtleties to remember
9071 though regarding what sort of iterators various types yield, in
9072 particular that `for foo in bar { }` yields values from a move
9073 iterator, destroying the original collection. [RFC][into-rfc].
9074 * Objects now have [default lifetime bounds][obj], so you don't
9075 have to write `Box<Trait+'static>` when you don't care about
9076 storing references. [RFC][obj-rfc].
9077 * In types that implement `Drop`, [lifetimes must outlive the
9078 value][drop]. This will soon make it possible to safely
9079 implement `Drop` for types where `#[unsafe_destructor]` is now
9080 required. Read the [gorgeous RFC][drop-rfc] for details.
9081 * The fully qualified <T as Trait>::X syntax lets you set the Self
9082 type for a trait method or associated type. [RFC][ufcs-rfc].
9083 * References to types that implement `Deref<U>` now [automatically
9084 coerce to references][deref] to the dereferenced type `U`,
9085 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9086 should eliminate many unsightly uses of `&*`, as when converting
9087 from references to vectors into references to
9088 slices. [RFC][deref-rfc].
9089 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9090 `|:|`) is obsolete and closure kind is inferred from context.
9091 * [`Self` is a keyword][Self].
9095 * The `Show` and `String` formatting traits [have been
9096 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9097 their related purposes. Automatically getting a string
9098 conversion to use with `format!("{:?}", something_to_debug)` is
9099 now written `#[derive(Debug)]`.
9100 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9101 OsStr}`, provide strings in platform-specific encodings for easier
9102 interop with system APIs. [RFC][osstr-rfc].
9103 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9104 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9105 creating raw pointers.
9109 * Certain long error messages of the form 'expected foo found bar'
9110 are now [split neatly across multiple
9111 lines][multiline]. Examples in the PR.
9112 * On Unix Rust can be [uninstalled][un] by running
9113 `/usr/local/lib/rustlib/uninstall.sh`.
9114 * The `#[rustc_on_unimplemented]` attribute, requiring the
9115 'on_unimplemented' feature, lets rustc [display custom error
9116 messages when a trait is expected to be implemented for a type
9121 * Rust is tested against a [LALR grammar][lalr], which parses
9122 almost all the Rust files that rustc does.
9124 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9125 [close]: https://github.com/rust-lang/rust/pull/21843
9126 [deref]: https://github.com/rust-lang/rust/pull/21351
9127 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9128 [drop]: https://github.com/rust-lang/rust/pull/21972
9129 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9130 [feat]: https://github.com/rust-lang/rust/pull/21248
9131 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9132 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9133 [fmt]: https://github.com/rust-lang/rust/pull/21457
9134 [into]: https://github.com/rust-lang/rust/pull/20790
9135 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9136 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9137 [lalr]: https://github.com/rust-lang/rust/pull/21452
9138 [multiline]: https://github.com/rust-lang/rust/pull/19870
9139 [obj]: https://github.com/rust-lang/rust/pull/22230
9140 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9141 [onun]: https://github.com/rust-lang/rust/pull/20889
9142 [osstr]: https://github.com/rust-lang/rust/pull/21488
9143 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9144 [Self]: https://github.com/rust-lang/rust/pull/22158
9145 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9146 [un]: https://github.com/rust-lang/rust/pull/22256
9149 Version 1.0.0-alpha (2015-01-09)
9150 ==================================
9152 * ~2400 changes, numerous bugfixes
9156 * The language itself is considered feature complete for 1.0,
9157 though there will be many usability improvements and bugfixes
9158 before the final release.
9159 * Nearly 50% of the public API surface of the standard library has
9160 been declared 'stable'. Those interfaces are unlikely to change
9162 * The long-running debate over integer types has been
9163 [settled][ints]: Rust will ship with types named `isize` and
9164 `usize`, rather than `int` and `uint`, for pointer-sized
9165 integers. Guidelines will be rolled out during the alpha cycle.
9166 * Most crates that are not `std` have been moved out of the Rust
9167 distribution into the Cargo ecosystem so they can evolve
9168 separately and don't need to be stabilized as quickly, including
9169 'time', 'getopts', 'num', 'regex', and 'term'.
9170 * Documentation continues to be expanded with more API coverage, more
9171 examples, and more in-depth explanations. The guides have been
9172 consolidated into [The Rust Programming Language][trpl].
9173 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9174 * All official Rust binary installers now come with [Cargo], the
9175 Rust package manager.
9179 * Closures have been [completely redesigned][unboxed] to be
9180 implemented in terms of traits, can now be used as generic type
9181 bounds and thus monomorphized and inlined, or via an opaque
9182 pointer (boxed) as in the old system. The new system is often
9183 referred to as 'unboxed' closures.
9184 * Traits now support [associated types][assoc], allowing families
9185 of related types to be defined together and used generically in
9187 * Enum variants are [namespaced by their type names][enum].
9188 * [`where` clauses][where] provide a more versatile and attractive
9189 syntax for specifying generic bounds, though the previous syntax
9191 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9193 * Rust [no longer has a runtime][rt] of any description, and only
9194 supports OS threads, not green threads.
9195 * At long last, Rust has been overhauled for 'dynamically-sized
9196 types' ([DST]), which integrates 'fat pointers' (object types,
9197 arrays, and `str`) more deeply into the type system, making it
9199 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9200 `..j` that produce range types and which, when combined with the
9201 `Index` operator and multidispatch, leads to a convenient slice
9203 * The new range syntax revealed an ambiguity in the fixed-length
9204 array syntax, so now fixed length arrays [are written `[T;
9206 * The `Copy` trait is no longer implemented automatically. Unsafe
9207 pointers no longer implement `Sync` and `Send` so types
9208 containing them don't automatically either. `Sync` and `Send`
9209 are now 'unsafe traits' so one can "forcibly" implement them via
9210 `unsafe impl` if a type confirms to the requirements for them
9211 even though the internals do not (e.g. structs containing unsafe
9212 pointers like `Arc`). These changes are intended to prevent some
9213 footguns and are collectively known as [opt-in built-in
9214 traits][oibit] (though `Sync` and `Send` will soon become pure
9215 library types unknown to the compiler).
9216 * Operator traits now take their operands [by value][ops], and
9217 comparison traits can use multidispatch to compare one type
9218 against multiple other types, allowing e.g. `String` to be
9219 compared with `&str`.
9220 * `if let` and `while let` are no longer feature-gated.
9221 * Rust has adopted a more [uniform syntax for escaping unicode
9222 characters][unicode].
9223 * `macro_rules!` [has been declared stable][mac]. Though it is a
9224 flawed system it is sufficiently popular that it must be usable
9225 for 1.0. Effort has gone into [future-proofing][mac-future] it
9226 in ways that will allow other macro systems to be developed in
9227 parallel, and won't otherwise impact the evolution of the
9229 * The prelude has been [pared back significantly][prelude] such
9230 that it is the minimum necessary to support the most pervasive
9231 code patterns, and through [generalized where clauses][where]
9232 many of the prelude extension traits have been consolidated.
9233 * Rust's rudimentary reflection [has been removed][refl], as it
9234 incurred too much code generation for little benefit.
9235 * [Struct variants][structvars] are no longer feature-gated.
9236 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9237 known as 'higher-ranked trait bounds', this crucially allows
9238 unboxed closures to work.
9239 * Macros invocations surrounded by parens or square brackets and
9240 not terminated by a semicolon are [parsed as
9241 expressions][macros], which makes expressions like `vec![1i32,
9242 2, 3].len()` work as expected.
9243 * Trait objects now implement their traits automatically, and
9244 traits that can be coerced to objects now must be [object
9246 * Automatically deriving traits is now done with `#[derive(...)]`
9247 not `#[deriving(...)]` for [consistency with other naming
9248 conventions][derive].
9249 * Importing the containing module or enum at the same time as
9250 items or variants they contain is [now done with `self` instead
9251 of `mod`][self], as in use `foo::{self, bar}`
9252 * Glob imports are no longer feature-gated.
9253 * The `box` operator and `box` patterns have been feature-gated
9254 pending a redesign. For now unique boxes should be allocated
9255 like other containers, with `Box::new`.
9259 * A [series][coll1] of [efforts][coll2] to establish
9260 [conventions][coll3] for collections types has resulted in API
9261 improvements throughout the standard library.
9262 * New [APIs for error handling][err] provide ergonomic interop
9263 between error types, and [new conventions][err-conv] describe
9264 more clearly the recommended error handling strategies in Rust.
9265 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9266 it is easier to discuss failure in the context of error handling
9267 without making clarifications as to whether you are referring to
9268 the 'fail' macro or failure more generally.
9269 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9270 syscall when available.
9271 * The 'serialize' crate has been renamed 'rustc-serialize' and
9272 moved out of the distribution to Cargo. Although it is widely
9273 used now, it is expected to be superseded in the near future.
9274 * The `Show` formatter, typically implemented with
9275 `#[derive(Show)]` is [now requested with the `{:?}`
9276 specifier][show] and is intended for use by all types, for uses
9277 such as `println!` debugging. The new `String` formatter must be
9278 implemented by hand, uses the `{}` specifier, and is intended
9279 for full-fidelity conversions of things that can logically be
9280 represented as strings.
9284 * [Flexible target specification][flex] allows rustc's code
9285 generation to be configured to support otherwise-unsupported
9287 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9288 respective debuggers with Rust-appropriate pretty-printing.
9289 * The Windows installation of Rust is distributed with the
9290 MinGW components currently required to link binaries on that
9295 * Nullable enum optimizations have been extended to more types so
9296 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9297 space than the inner types themselves.
9298 * Work has begun on supporting AArch64.
9300 [Cargo]: https://crates.io
9301 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9302 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9303 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9304 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9305 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9306 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9307 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9308 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9309 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9310 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9311 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9312 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9313 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9314 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9315 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9316 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9317 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9318 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9319 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9320 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9321 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9322 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9323 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9324 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9325 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9326 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9327 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9328 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9329 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9330 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9331 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9332 [trpl]: https://doc.rust-lang.org/book/index.html
9333 [rbe]: http://rustbyexample.com/
9336 Version 0.12.0 (2014-10-09)
9337 =============================
9339 * ~1900 changes, numerous bugfixes
9343 * The introductory documentation (now called The Rust Guide) has
9344 been completely rewritten, as have a number of supplementary
9346 * Rust's package manager, Cargo, continues to improve and is
9347 sometimes considered to be quite awesome.
9348 * Many API's in `std` have been reviewed and updated for
9349 consistency with the in-development Rust coding
9350 guidelines. The standard library documentation tracks
9351 stabilization progress.
9352 * Minor libraries have been moved out-of-tree to the rust-lang org
9353 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9354 be installed with Cargo.
9355 * Lifetime elision allows lifetime annotations to be left off of
9356 function declarations in many common scenarios.
9357 * Rust now works on 64-bit Windows.
9360 * Indexing can be overloaded with the `Index` and `IndexMut`
9362 * The `if let` construct takes a branch only if the `let` pattern
9363 matches, currently behind the 'if_let' feature gate.
9364 * 'where clauses', a more flexible syntax for specifying trait
9365 bounds that is more aesthetic, have been added for traits and
9366 free functions. Where clauses will in the future make it
9367 possible to constrain associated types, which would be
9368 impossible with the existing syntax.
9369 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9370 the 'slicing_syntax' feature gate, and can be overloaded with
9371 the `Slice` or `SliceMut` traits.
9372 * The syntax for matching of sub-slices has been changed to use a
9373 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9374 consistency with other uses of `..` and to future-proof
9375 potential additional uses of the syntax.
9376 * The syntax for matching inclusive ranges in patterns has changed
9377 from `0..3` to `0...4` to be consistent with the exclusive range
9379 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9380 c]`) has been put behind the 'advanced_slice_patterns' feature
9381 gate and may be removed in the future.
9382 * Components of tuples and tuple structs can be extracted using
9383 the `value.0` syntax, currently behind the `tuple_indexing`
9385 * The `#[crate_id]` attribute is no longer supported; versioning
9386 is handled by the package manager.
9387 * Renaming crate imports are now written `extern crate foo as bar`
9388 instead of `extern crate bar = foo`.
9389 * Renaming use statements are now written `use foo as bar` instead
9391 * `let` and `match` bindings and argument names in macros are now
9393 * The new, more efficient, closure types ('unboxed closures') have
9394 been added under a feature gate, 'unboxed_closures'. These will
9395 soon replace the existing closure types, once higher-ranked
9396 trait lifetimes are added to the language.
9397 * `move` has been added as a keyword, for indicating closures
9398 that capture by value.
9399 * Mutation and assignment is no longer allowed in pattern guards.
9400 * Generic structs and enums can now have trait bounds.
9401 * The `Share` trait is now called `Sync` to free up the term
9402 'shared' to refer to 'shared reference' (the default reference
9404 * Dynamically-sized types have been mostly implemented,
9405 unifying the behavior of fat-pointer types with the rest of the
9407 * As part of dynamically-sized types, the `Sized` trait has been
9408 introduced, which qualifying types implement by default, and
9409 which type parameters expect by default. To specify that a type
9410 parameter does not need to be sized, write `<Sized? T>`. Most
9411 types are `Sized`, notable exceptions being unsized arrays
9412 (`[T]`) and trait types.
9413 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9414 * Lifetime bounds can now be applied to type parameters and object
9416 * The old, reference counted GC type, `Gc<T>` which was once
9417 denoted by the `@` sigil, has finally been removed. GC will be
9418 revisited in the future.
9421 * Library documentation has been improved for a number of modules.
9422 * Bit-vectors, collections::bitv has been modernized.
9423 * The url crate is deprecated in favor of
9424 http://github.com/servo/rust-url, which can be installed with
9426 * Most I/O stream types can be cloned and subsequently closed from
9428 * A `std::time::Duration` type has been added for use in I/O
9429 methods that rely on timers, as well as in the 'time' crate's
9430 `Timespec` arithmetic.
9431 * The runtime I/O abstraction layer that enabled the green thread
9432 scheduler to do non-thread-blocking I/O has been removed, along
9433 with the libuv-based implementation employed by the green thread
9434 scheduler. This will greatly simplify the future I/O work.
9435 * `collections::btree` has been rewritten to have a more
9436 idiomatic and efficient design.
9439 * rustdoc output now indicates the stability levels of API's.
9440 * The `--crate-name` flag can specify the name of the crate
9441 being compiled, like `#[crate_name]`.
9442 * The `-C metadata` specifies additional metadata to hash into
9443 symbol names, and `-C extra-filename` specifies additional
9444 information to put into the output filename, for use by the
9445 package manager for versioning.
9446 * debug info generation has continued to improve and should be
9447 more reliable under both gdb and lldb.
9448 * rustc has experimental support for compiling in parallel
9449 using the `-C codegen-units` flag.
9450 * rustc no longer encodes rpath information into binaries by
9454 * Stack usage has been optimized with LLVM lifetime annotations.
9455 * Official Rust binaries on Linux are more compatible with older
9456 kernels and distributions, built on CentOS 5.10.
9459 Version 0.11.0 (2014-07-02)
9460 ==========================
9462 * ~1700 changes, numerous bugfixes
9465 * ~[T] has been removed from the language. This type is superseded by
9467 * ~str has been removed from the language. This type is superseded by
9469 * ~T has been removed from the language. This type is superseded by the
9471 * @T has been removed from the language. This type is superseded by the
9472 standard library's std::gc::Gc<T> type.
9473 * Struct fields are now all private by default.
9474 * Vector indices and shift amounts are both required to be a `uint`
9475 instead of any integral type.
9476 * Byte character, byte string, and raw byte string literals are now all
9477 supported by prefixing the normal literal with a `b`.
9478 * Multiple ABIs are no longer allowed in an ABI string
9479 * The syntax for lifetimes on closures/procedures has been tweaked
9480 slightly: `<'a>|A, B|: 'b + K -> T`
9481 * Floating point modulus has been removed from the language; however it
9482 is still provided by a library implementation.
9483 * Private enum variants are now disallowed.
9484 * The `priv` keyword has been removed from the language.
9485 * A closure can no longer be invoked through a &-pointer.
9486 * The `use foo, bar, baz;` syntax has been removed from the language.
9487 * The transmute intrinsic no longer works on type parameters.
9488 * Statics now allow blocks/items in their definition.
9489 * Trait bounds are separated from objects with + instead of : now.
9490 * Objects can no longer be read while they are mutably borrowed.
9491 * The address of a static is now marked as insignificant unless the
9492 #[inline(never)] attribute is placed it.
9493 * The #[unsafe_destructor] attribute is now behind a feature gate.
9494 * Struct literals are no longer allowed in ambiguous positions such as
9495 if, while, match, and for..in.
9496 * Declaration of lang items and intrinsics are now feature-gated by
9498 * Integral literals no longer default to `int`, and floating point
9499 literals no longer default to `f64`. Literals must be suffixed with an
9500 appropriate type if inference cannot determine the type of the
9502 * The Box<T> type is no longer implicitly borrowed to &mut T.
9503 * Procedures are now required to not capture borrowed references.
9506 * The standard library is now a "facade" over a number of underlying
9507 libraries. This means that development on the standard library should
9508 be speedier due to smaller crates, as well as a clearer line between
9510 * A new library, libcore, lives under the standard library's facade
9511 which is Rust's "0-assumption" library, suitable for embedded and
9512 kernel development for example.
9513 * A regex crate has been added to the standard distribution. This crate
9514 includes statically compiled regular expressions.
9515 * The unwrap/unwrap_err methods on Result require a Show bound for
9516 better error messages.
9517 * The return types of the std::comm primitives have been centralized
9518 around the Result type.
9519 * A number of I/O primitives have gained the ability to time out their
9521 * A number of I/O primitives have gained the ability to close their
9522 reading/writing halves to cancel pending operations.
9523 * Reverse iterator methods have been removed in favor of `rev()` on
9524 their forward-iteration counterparts.
9525 * A bitflags! macro has been added to enable easy interop with C and
9526 management of bit flags.
9527 * A debug_assert! macro is now provided which is disabled when
9528 `--cfg ndebug` is passed to the compiler.
9529 * A graphviz crate has been added for creating .dot files.
9530 * The std::cast module has been migrated into std::mem.
9531 * The std::local_data api has been migrated from freestanding functions
9532 to being based on methods.
9533 * The Pod trait has been renamed to Copy.
9534 * jemalloc has been added as the default allocator for types.
9535 * The API for allocating memory has been changed to use proper alignment
9536 and sized deallocation
9537 * Connecting a TcpStream or binding a TcpListener is now based on a
9538 string address and a u16 port. This allows connecting to a hostname as
9540 * The Reader trait now contains a core method, read_at_least(), which
9541 correctly handles many repeated 0-length reads.
9542 * The process-spawning API is now centered around a builder-style
9544 * The :? printing qualifier has been moved from the standard library to
9545 an external libdebug crate.
9546 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9547 have been renamed to Eq/Ord.
9548 * The select/plural methods have been removed from format!. The escapes
9549 for { and } have also changed from \{ and \} to {{ and }},
9551 * The TaskBuilder API has been re-worked to be a true builder, and
9552 extension traits for spawning native/green tasks have been added.
9555 * All breaking changes to the language or libraries now have their
9556 commit message annotated with `[breaking-change]` to allow for easy
9557 discovery of breaking changes.
9558 * The compiler will now try to suggest how to annotate lifetimes if a
9559 lifetime-related error occurs.
9560 * Debug info continues to be improved greatly with general bug fixes and
9561 better support for situations like link time optimization (LTO).
9562 * Usage of syntax extensions when cross-compiling has been fixed.
9563 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9564 -fdata-sections and --gc-sections has been enabled by default
9565 * The compiler is now stricter about where it will load module files
9566 from when a module is declared via `mod foo;`.
9567 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9568 Syntax extensions are now discovered via a "plugin registrar" type
9569 which will be extended in the future to other various plugins.
9570 * Lints have been restructured to allow for dynamically loadable lints.
9571 * A number of rustdoc improvements:
9572 * The HTML output has been visually redesigned.
9573 * Markdown is now powered by hoedown instead of sundown.
9574 * Searching heuristics have been greatly improved.
9575 * The search index has been reduced in size by a great amount.
9576 * Cross-crate documentation via `pub use` has been greatly improved.
9577 * Primitive types are now hyperlinked and documented.
9578 * Documentation has been moved from static.rust-lang.org/doc to
9580 * A new sandbox, play.rust-lang.org, is available for running and
9581 sharing rust code examples on-line.
9582 * Unused attributes are now more robustly warned about.
9583 * The dead_code lint now warns about unused struct fields.
9584 * Cross-compiling to iOS is now supported.
9585 * Cross-compiling to mipsel is now supported.
9586 * Stability attributes are now inherited by default and no longer apply
9587 to intra-crate usage, only inter-crate usage.
9588 * Error message related to non-exhaustive match expressions have been
9592 Version 0.10 (2014-04-03)
9593 =========================
9595 * ~1500 changes, numerous bugfixes
9598 * A new RFC process is now in place for modifying the language.
9599 * Patterns with `@`-pointers have been removed from the language.
9600 * Patterns with unique vectors (`~[T]`) have been removed from the
9602 * Patterns with unique strings (`~str`) have been removed from the
9604 * `@str` has been removed from the language.
9605 * `@[T]` has been removed from the language.
9606 * `@self` has been removed from the language.
9607 * `@Trait` has been removed from the language.
9608 * Headers on `~` allocations which contain `@` boxes inside the type for
9609 reference counting have been removed.
9610 * The semantics around the lifetimes of temporary expressions have changed,
9611 see #3511 and #11585 for more information.
9612 * Cross-crate syntax extensions are now possible, but feature gated. See
9613 #11151 for more information. This includes both `macro_rules!` macros as
9614 well as syntax extensions such as `format!`.
9615 * New lint modes have been added, and older ones have been turned on to be
9617 * Unnecessary parentheses
9620 * Uppercase variables
9621 * Publicly visible private types
9622 * `#[deriving]` with raw pointers
9623 * Unsafe functions can no longer be coerced to closures.
9624 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9625 * The `#[simd]` attribute is now behind a feature gate.
9626 * Visibility is no longer allowed on `extern crate` statements, and
9627 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9628 * Trailing commas are now allowed in argument lists and tuple patterns.
9629 * The `do` keyword has been removed, it is now a reserved keyword.
9630 * Default type parameters have been implemented, but are feature gated.
9631 * Borrowed variables through captures in closures are now considered soundly.
9632 * `extern mod` is now `extern crate`
9633 * The `Freeze` trait has been removed.
9634 * The `Share` trait has been added for types that can be shared among
9636 * Labels in macros are now hygienic.
9637 * Expression/statement macro invocations can be delimited with `{}` now.
9638 * Treatment of types allowed in `static mut` locations has been tweaked.
9639 * The `*` and `.` operators are now overloadable through the `Deref` and
9641 * `~Trait` and `proc` no longer have `Send` bounds by default.
9642 * Partial type hints are now supported with the `_` type marker.
9643 * An `Unsafe` type was introduced for interior mutability. It is now
9644 considered undefined to transmute from `&T` to `&mut T` without using the
9646 * The #[linkage] attribute was implemented for extern statics/functions.
9647 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9648 * `Pod` was renamed to `Copy`.
9651 * The `libextra` library has been removed. It has now been decomposed into
9652 component libraries with smaller and more focused nuggets of
9653 functionality. The full list of libraries can be found on the
9654 documentation index page.
9655 * std: `std::condition` has been removed. All I/O errors are now propagated
9656 through the `Result` type. In order to assist with error handling, a
9657 `try!` macro for unwrapping errors with an early return and a lint for
9658 unused results has been added. See #12039 for more information.
9659 * std: The `vec` module has been renamed to `slice`.
9660 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9661 This will become the only growable vector in the future.
9662 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9663 are now found at `std::io::BufferedReader` instead of
9664 `std::io::buffered::BufferedReader`.
9665 * std: `print` and `println` are no longer in the prelude, the `print!` and
9666 `println!` macros are intended to be used instead.
9667 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9668 attempts to statically prevent cycles.
9669 * std: The standard distribution is adopting the policy of pushing failure
9670 to the user rather than failing in libraries. Many functions (such as
9671 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9672 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9673 deriving mode: `#[deriving(Show)]`.
9674 * std: `ToStr` is now implemented for all types implementing `Show`.
9675 * std: The formatting trait methods now take `&self` instead of `&T`
9676 * std: The `invert()` method on iterators has been renamed to `rev()`
9677 * std: `std::num` has seen a reduction in the genericity of its traits,
9678 consolidating functionality into a few core traits.
9679 * std: Backtraces are now printed on task failure if the environment
9680 variable `RUST_BACKTRACE` is present.
9681 * std: Naming conventions for iterators have been standardized. More details
9682 can be found on the wiki's style guide.
9683 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9684 still implement the function.
9685 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9686 * std: `assert_approx_eq!` has been removed
9687 * std: The `e` and `E` formatting specifiers for floats have been added to
9688 print them in exponential notation.
9689 * std: The `Times` trait has been removed
9690 * std: Indications of variance and opting out of builtin bounds is done
9691 through marker types in `std::kinds::marker` now
9692 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9693 `#[deriving(Hash)]` is now possible.
9694 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9695 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9696 * std: `Chan::new` is now `channel()`.
9697 * std: A new synchronous channel type has been implemented.
9698 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9699 * std: `hashmap` and `trie` have been moved to `libcollections`
9700 * std: `run` has been rolled into `io::process`
9701 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9702 * std: The equality and comparison traits have seen some reorganization.
9703 * std: `rand` has moved to `librand`.
9704 * std: `to_{lower,upper}case` has been implemented for `char`.
9705 * std: Logging has been moved to `liblog`.
9706 * collections: `HashMap` has been rewritten for higher performance and less
9708 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9709 it can be booted manually. The runtime guide has more information and
9711 * native: All I/O functionality except signals has been implemented.
9712 * green: Task spawning with `libgreen` has been optimized with stack caching
9713 and various trimming of code.
9714 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9715 * sync: The `extra::sync` module has been updated to modern rust (and moved
9716 to the `sync` library), tweaking and improving various interfaces while
9717 dropping redundant functionality.
9718 * sync: A new `Barrier` type has been added to the `sync` library.
9719 * sync: An efficient mutex for native and green tasks has been implemented.
9720 * serialize: The `base64` module has seen some improvement. It treats
9721 newlines better, has non-string error values, and has seen general
9723 * fourcc: A `fourcc!` macro was introduced
9724 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9725 hexadecimal literal.
9728 * `rustpkg` has been deprecated and removed from the main repository. Its
9729 replacement, `cargo`, is under development.
9730 * Nightly builds of rust are now available
9731 * The memory usage of rustc has been improved many times throughout this
9733 * The build process supports disabling rpath support for the rustc binary
9735 * Code generation has improved in some cases, giving more information to the
9736 LLVM optimization passes to enable more extensive optimizations.
9737 * Debuginfo compatibility with lldb on OSX has been restored.
9738 * The master branch is now gated on an android bot, making building for
9739 android much more reliable.
9740 * Output flags have been centralized into one `--emit` flag.
9741 * Crate type flags have been centralized into one `--crate-type` flag.
9742 * Codegen flags have been consolidated behind a `-C` flag.
9743 * Linking against outdated crates now has improved error messages.
9744 * Error messages with lifetimes will often suggest how to annotate the
9745 function to fix the error.
9746 * Many more types are documented in the standard library, and new guides
9748 * Many `rustdoc` improvements:
9749 * code blocks are syntax highlighted.
9750 * render standalone markdown files.
9751 * the --test flag tests all code blocks by default.
9752 * exported macros are displayed.
9753 * re-exported types have their documentation inlined at the location of the
9755 * search works across crates that have been rendered to the same output
9759 Version 0.9 (2014-01-09)
9760 ==========================
9762 * ~1800 changes, numerous bugfixes
9765 * The `float` type has been removed. Use `f32` or `f64` instead.
9766 * A new facility for enabling experimental features (feature gating) has
9767 been added, using the crate-level `#[feature(foo)]` attribute.
9768 * Managed boxes (@) are now behind a feature gate
9769 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9770 standard library's `Gc` or `Rc` types instead.
9771 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9772 * Jumping back to the top of a loop is now done with `continue` instead of
9774 * Strings can no longer be mutated through index assignment.
9775 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9776 hash delimiters, as in `r###"foo"###`.
9777 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9779 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9780 * `@fn`s have been removed.
9781 * `do` only works with procs in order to make it obvious what the cost
9783 * Single-element tuple-like structs can no longer be dereferenced to
9784 obtain the inner value. A more comprehensive solution for overloading
9785 the dereference operator will be provided in the future.
9786 * The `#[link(...)]` attribute has been replaced with
9787 `#[crate_id = "name#vers"]`.
9788 * Empty `impl`s must be terminated with empty braces and may not be
9789 terminated with a semicolon.
9790 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9791 no longer has any special meaning.
9792 * The old `fmt!` string formatting macro has been removed.
9793 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9794 `print!` and `println!`.
9795 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9796 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9797 `extern mod foo = "bar"` instead.
9798 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9799 * Macros can have attributes.
9800 * Macros can expand to items with attributes.
9801 * Macros can expand to multiple items.
9802 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9803 * Comments may be nested.
9804 * Values automatically coerce to trait objects they implement, without
9806 * Enum discriminants are no longer an entire word but as small as needed to
9807 contain all the variants. The `repr` attribute can be used to override
9808 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9809 `#[repr(C)]` to match C enums.
9810 * Non-string literals are not allowed in attributes (they never worked).
9811 * The FFI now supports variadic functions.
9812 * Octal numeric literals, as in `0o7777`.
9813 * The `concat!` syntax extension performs compile-time string concatenation.
9814 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9815 removed as Rust no longer uses segmented stacks.
9816 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9817 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9818 not `*`; ignoring remaining fields of a struct is also done with `..`,
9819 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9820 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9821 * `rustc` supports the "system" calling convention, which defaults to the
9822 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9824 * The `type_overflow` lint (default: warn) checks literals for overflow.
9825 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9826 * The `attribute_usage` lint (default: warn) warns about unknown
9828 * The `unknown_features` lint (default: warn) warns about unknown
9830 * The `dead_code` lint (default: warn) checks for dead code.
9831 * Rust libraries can be linked statically to one another
9832 * `#[link_args]` is behind the `link_args` feature gate.
9833 * Native libraries are now linked with `#[link(name = "foo")]`
9834 * Native libraries can be statically linked to a rust crate
9835 (`#[link(name = "foo", kind = "static")]`).
9836 * Native OS X frameworks are now officially supported
9837 (`#[link(name = "foo", kind = "framework")]`).
9838 * The `#[thread_local]` attribute creates thread-local (not task-local)
9839 variables. Currently behind the `thread_local` feature gate.
9840 * The `return` keyword may be used in closures.
9841 * Types that can be copied via a memcpy implement the `Pod` kind.
9842 * The `cfg` attribute can now be used on struct fields and enum variants.
9845 * std: The `option` and `result` API's have been overhauled to make them
9846 simpler, more consistent, and more composable.
9847 * std: The entire `std::io` module has been replaced with one that is
9848 more comprehensive and that properly interfaces with the underlying
9849 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9851 * std: `io::util` contains a number of useful implementations of
9852 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9853 `ZeroReader`, `TeeReader`.
9854 * std: The reference counted pointer type `extra::rc` moved into std.
9855 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9856 just a wrapper around it).
9857 * std: The `Either` type has been removed.
9858 * std: `fmt::Default` can be implemented for any type to provide default
9859 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9860 * std: The `rand` API continues to be tweaked.
9861 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9862 on failure in gdb, is now named `rust_fail`.
9863 * std: The `each_key` and `each_value` methods on `HashMap` have been
9864 replaced by the `keys` and `values` iterators.
9865 * std: Functions dealing with type size and alignment have moved from the
9866 `sys` module to the `mem` module.
9867 * std: The `path` module was written and API changed.
9868 * std: `str::from_utf8` has been changed to cast instead of allocate.
9869 * std: `starts_with` and `ends_with` methods added to vectors via the
9870 `ImmutableEqVector` trait, which is in the prelude.
9871 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9872 if the index is out of bounds.
9873 * std: Task failure no longer propagates between tasks, as the model was
9874 complex, expensive, and incompatible with thread-based tasks.
9875 * std: The `Any` type can be used for dynamic typing.
9876 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9878 * std: Methods that produce iterators generally do not have an `_iter`
9880 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9881 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9882 * std: `util::ignore` renamed to `prelude::drop`.
9883 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9885 * std: `vec::raw` has seen a lot of cleanup and API changes.
9886 * std: The standard library no longer includes any C++ code, and very
9887 minimal C, eliminating the dependency on libstdc++.
9888 * std: Runtime scheduling and I/O functionality has been factored out into
9889 extensible interfaces and is now implemented by two different crates:
9890 libnative, for native threading and I/O; and libgreen, for green threading
9891 and I/O. This paves the way for using the standard library in more limited
9892 embedded environments.
9893 * std: The `comm` module has been rewritten to be much faster, have a
9894 simpler, more consistent API, and to work for both native and green
9896 * std: All libuv dependencies have been moved into the rustuv crate.
9897 * native: New implementations of runtime scheduling on top of OS threads.
9898 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9900 * green: The green thread scheduler and message passing types are almost
9902 * extra: The `flatpipes` module had bitrotted and was removed.
9903 * extra: All crypto functions have been removed and Rust now has a policy of
9904 not reimplementing crypto in the standard library. In the future crypto
9905 will be provided by external crates with bindings to established libraries.
9906 * extra: `c_vec` has been modernized.
9907 * extra: The `sort` module has been removed. Use the `sort` method on
9911 * The `rust` and `rusti` commands have been removed, due to lack of
9913 * `rustdoc` was completely rewritten.
9914 * `rustdoc` can test code examples in documentation.
9915 * `rustpkg` can test packages with the argument, 'test'.
9916 * `rustpkg` supports arbitrary dependencies, including C libraries.
9917 * `rustc`'s support for generating debug info is improved again.
9918 * `rustc` has better error reporting for unbalanced delimiters.
9919 * `rustc`'s JIT support was removed due to bitrot.
9920 * Executables and static libraries can be built with LTO (-Z lto)
9921 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9925 Version 0.8 (2013-09-26)
9926 ============================
9928 * ~2200 changes, numerous bugfixes
9931 * The `for` loop syntax has changed to work with the `Iterator` trait.
9932 * At long last, unwinding works on Windows.
9933 * Default methods are ready for use.
9934 * Many trait inheritance bugs fixed.
9935 * Owned and borrowed trait objects work more reliably.
9936 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9937 * rustc can omit emission of code for the `debug!` macro if it is passed
9939 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9940 for foo.rs, then foo/mod.rs, and will generate an error when both are
9942 * Strings no longer contain trailing nulls. The new `std::c_str` module
9943 provides new mechanisms for converting to C strings.
9944 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9945 * The FFI has been overhauled such that foreign functions are called directly,
9946 instead of through a stack-switching wrapper.
9947 * Calling a foreign function must be done through a Rust function with the
9948 `#[fixed_stack_segment]` attribute.
9949 * The `externfn!` macro can be used to declare both a foreign function and
9950 a `#[fixed_stack_segment]` wrapper at once.
9951 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9952 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9953 * `priv` is disallowed everywhere except for struct fields and enum variants.
9954 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9955 * `ref` bindings in irrefutable patterns work correctly now.
9956 * `char` is now prevented from containing invalid code points.
9957 * Casting to `bool` is no longer allowed.
9958 * `\0` is now accepted as an escape in chars and strings.
9959 * `yield` is a reserved keyword.
9960 * `typeof` is a reserved keyword.
9961 * Crates may be imported by URL with `extern mod foo = "url";`.
9962 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9963 * Static vectors can be initialized with repeating elements,
9964 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9965 * Static structs can be initialized with functional record update,
9966 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9967 * `cfg!` can be used to conditionally execute code based on the crate
9968 configuration, similarly to `#[cfg(...)]`.
9969 * The `unnecessary_qualification` lint detects unneeded module
9970 prefixes (default: allow).
9971 * Arithmetic operations have been implemented on the SIMD types in
9972 `std::unstable::simd`.
9973 * Exchange allocation headers were removed, reducing memory usage.
9974 * `format!` implements a completely new, extensible, and higher-performance
9975 string formatting system. It will replace `fmt!`.
9976 * `print!` and `println!` write formatted strings (using the `format!`
9977 extension) to stdout.
9978 * `write!` and `writeln!` write formatted strings (using the `format!`
9979 extension) to the new Writers in `std::rt::io`.
9980 * The library section in which a function or static is placed may
9981 be specified with `#[link_section = "..."]`.
9982 * The `proto!` syntax extension for defining bounded message protocols
9984 * `macro_rules!` is hygienic for `let` declarations.
9985 * The `#[export_name]` attribute specifies the name of a symbol.
9986 * `unreachable!` can be used to indicate unreachable code, and fails
9990 * std: Transitioned to the new runtime, written in Rust.
9991 * std: Added an experimental I/O library, `rt::io`, based on the new
9993 * std: A new generic `range` function was added to the prelude, replacing
9994 `uint::range` and friends.
9995 * std: `range_rev` no longer exists. Since range is an iterator it can be
9996 reversed with `range(lo, hi).invert()`.
9997 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9998 renamed to `unwrap_or`.
9999 * std: The `iterator` module was renamed to `iter`.
10000 * std: Integral types now support the `checked_add`, `checked_sub`, and
10001 `checked_mul` operations for detecting overflow.
10002 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10004 * std: Methods are standardizing on conventions for casting methods:
10005 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10007 * std: The `CString` type in `c_str` provides new ways to convert to and
10009 * std: `DoubleEndedIterator` can yield elements in two directions.
10010 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10012 * std: `str::from_bytes` renamed to `str::from_utf8`.
10013 * std: `pop_opt` and `shift_opt` methods added to vectors.
10014 * std: The task-local data interface no longer uses @, and keys are
10015 no longer function pointers.
10016 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10017 * std: Added `SharedPort` to `comm`.
10018 * std: `Eq` has a default method for `ne`; only `eq` is required
10019 in implementations.
10020 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10021 is required in implementations.
10022 * std: `is_utf8` performance is improved, impacting many string functions.
10023 * std: `os::MemoryMap` provides cross-platform mmap.
10024 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10025 are not 'in-bounds' are considered undefined.
10026 * std: Many freestanding functions in `vec` removed in favor of methods.
10027 * std: Many freestanding functions on scalar types removed in favor of
10029 * std: Many options to task builders were removed since they don't make
10030 sense in the new scheduler design.
10031 * std: More containers implement `FromIterator` so can be created by the
10033 * std: More complete atomic types in `unstable::atomics`.
10034 * std: `comm::PortSet` removed.
10035 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10036 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10037 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10038 default implementations.
10039 * std: Various `from_str` functions were removed in favor of a generic
10040 `from_str` which is available in the prelude.
10041 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10042 * extra: `dlist`, the doubly-linked list was modernized.
10043 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10044 * extra: Added `glob` module, replacing `std::os::glob`.
10045 * extra: `rope` was removed.
10046 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10047 * extra: `net`, and `timer` were removed. The experimental replacements
10048 are `std::rt::io::net` and `std::rt::io::timer`.
10049 * extra: Iterators implemented for `SmallIntMap`.
10050 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10051 * extra: `SmallIntSet` removed. Use `BitvSet`.
10052 * extra: Performance of JSON parsing greatly improved.
10053 * extra: `semver` updated to SemVer 2.0.0.
10054 * extra: `term` handles more terminals correctly.
10055 * extra: `dbg` module removed.
10056 * extra: `par` module removed.
10057 * extra: `future` was cleaned up, with some method renames.
10058 * extra: Most free functions in `getopts` were converted to methods.
10061 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10062 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10063 similarly to gcc's `--march` flag.
10064 * rustc's performance compiling small crates is much better.
10065 * rustpkg has received many improvements.
10066 * rustpkg supports git tags as package IDs.
10067 * rustpkg builds into target-specific directories so it can be used for
10069 * The number of concurrent test tasks is controlled by the environment
10070 variable RUST_TEST_TASKS.
10071 * The test harness can now report metrics for benchmarks.
10072 * All tools have man pages.
10073 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10074 * The runtime uses jemalloc for allocations.
10075 * Segmented stacks are temporarily disabled as part of the transition to
10076 the new runtime. Stack overflows are possible!
10077 * A new documentation backend, rustdoc_ng, is available for use. It is
10078 still invoked through the normal `rustdoc` command.
10081 Version 0.7 (2013-07-03)
10082 =======================
10084 * ~2000 changes, numerous bugfixes
10087 * `impl`s no longer accept a visibility qualifier. Put them on methods
10089 * The borrow checker has been rewritten with flow-sensitivity, fixing
10090 many bugs and inconveniences.
10091 * The `self` parameter no longer implicitly means `&'self self`,
10092 and can be explicitly marked with a lifetime.
10093 * Overloadable compound operators (`+=`, etc.) have been temporarily
10094 removed due to bugs.
10095 * The `for` loop protocol now requires `for`-iterators to return `bool`
10096 so they compose better.
10097 * The `Durable` trait is replaced with the `'static` bounds.
10098 * Trait default methods work more often.
10099 * Structs with the `#[packed]` attribute have byte alignment and
10100 no padding between fields.
10101 * Type parameters bound by `Copy` must now be copied explicitly with
10102 the `copy` keyword.
10103 * It is now illegal to move out of a dereferenced unsafe pointer.
10104 * `Option<~T>` is now represented as a nullable pointer.
10105 * `@mut` does dynamic borrow checks correctly.
10106 * The `main` function is only detected at the topmost level of the crate.
10107 The `#[main]` attribute is still valid anywhere.
10108 * Struct fields may no longer be mutable. Use inherited mutability.
10109 * The `#[no_send]` attribute makes a type that would otherwise be
10111 * The `#[no_freeze]` attribute makes a type that would otherwise be
10113 * Unbounded recursion will abort the process after reaching the limit
10114 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10115 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10116 are never implicitly copyable.
10117 * `#[static_assert]` makes compile-time assertions about static bools.
10118 * At long last, 'argument modes' no longer exist.
10119 * The rarely used `use mod` statement no longer exists.
10121 * Syntax extensions
10122 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10124 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10125 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10126 `#[deriving(...)]`.
10127 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10128 and unsuffixed integer literals.
10131 * The `core` crate was renamed to `std`.
10132 * The `std` crate was renamed to `extra`.
10133 * More and improved documentation.
10134 * std: `iterator` module for external iterator objects.
10135 * Many old-style (internal, higher-order function) iterators replaced by
10136 implementations of `Iterator`.
10137 * std: Many old internal vector and string iterators,
10138 incl. `any`, `all`. removed.
10139 * std: The `finalize` method of `Drop` renamed to `drop`.
10140 * std: The `drop` method now takes `&mut self` instead of `&self`.
10141 * std: The prelude no longer re-exports any modules, only types and traits.
10142 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10143 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10144 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10145 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10146 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10147 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10148 * std: Many types implement `Clone`.
10149 * std: `path` type renamed to `Path`.
10150 * std: `mut` module and `Mut` type removed.
10151 * std: Many standalone functions removed in favor of methods and iterators
10152 in `vec`, `str`. In the future methods will also work as functions.
10153 * std: `reinterpret_cast` removed. Use `transmute`.
10154 * std: ascii string handling in `std::ascii`.
10155 * std: `Rand` is implemented for ~/@.
10156 * std: `run` module for spawning processes overhauled.
10157 * std: Various atomic types added to `unstable::atomic`.
10158 * std: Various types implement `Zero`.
10159 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10160 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10161 * std: Added `os::mkdir_recursive`.
10162 * std: Added `os::glob` function performs filesystems globs.
10163 * std: `FuzzyEq` renamed to `ApproxEq`.
10164 * std: `Map` now defines `pop` and `swap` methods.
10165 * std: `Cell` constructors converted to static methods.
10166 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10167 * extra: `flate` module moved from `std` to `extra`.
10168 * extra: `fileinput` module for iterating over a series of files.
10169 * extra: `Complex` number type and `complex` module.
10170 * extra: `Rational` number type and `rational` module.
10171 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10172 * extra: `term` uses terminfo now, is more correct.
10173 * extra: `arc` functions converted to methods.
10174 * extra: Implementation of fixed output size variations of SHA-2.
10177 * `unused_variables` lint mode for unused variables (default: warn).
10178 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10180 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10182 * `dead_assignment` lint mode for unread variables (default: warn).
10183 * `unnecessary_allocation` lint mode detects some heap allocations that are
10184 immediately borrowed so could be written without allocating (default: warn).
10185 * `missing_doc` lint mode (default: allow).
10186 * `unreachable_code` lint mode (default: warn).
10187 * The `rusti` command has been rewritten and a number of bugs addressed.
10188 * rustc outputs in color on more terminals.
10189 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10190 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10191 * Compiling with `-g` will make the binary record information about
10192 dynamic borrowcheck failures for debugging.
10193 * rustdoc has a nicer stylesheet.
10194 * Various improvements to rustdoc.
10195 * Improvements to rustpkg (see the detailed release notes).
10198 Version 0.6 (2013-04-03)
10199 ========================
10201 * ~2100 changes, numerous bugfixes
10204 * The self type parameter in traits is now spelled `Self`
10205 * The `self` parameter in trait and impl methods must now be explicitly
10206 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10207 * Static methods no longer require the `static` keyword and instead
10208 are distinguished by the lack of a `self` parameter
10209 * Replaced the `Durable` trait with the `'static` lifetime
10210 * The old closure type syntax with the trailing sigil has been
10211 removed in favor of the more consistent leading sigil
10212 * `super` is a keyword, and may be prefixed to paths
10213 * Trait bounds are separated with `+` instead of whitespace
10214 * Traits are implemented with `impl Trait for Type`
10215 instead of `impl Type: Trait`
10216 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10217 * The `export` keyword has finally been removed
10218 * The `move` keyword has been removed (see "Semantic changes")
10219 * The interior mutability qualifier on vectors, `[mut T]`, has been
10220 removed. Use `&mut [T]`, etc.
10221 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10222 * `fail` is no longer a keyword. Use `fail!()`
10223 * `assert` is no longer a keyword. Use `assert!()`
10224 * `log` is no longer a keyword. use `debug!`, etc.
10225 * 1-tuples may be represented as `(T,)`
10226 * Struct fields may no longer be `mut`. Use inherited mutability,
10227 `@mut T`, `core::mut` or `core::cell`
10228 * `extern mod { ... }` is no longer valid syntax for foreign
10229 function modules. Use extern blocks: `extern { ... }`
10230 * Newtype enums removed. Use tuple-structs.
10231 * Trait implementations no longer support visibility modifiers
10232 * Pattern matching over vectors improved and expanded
10233 * `const` renamed to `static` to correspond to lifetime name,
10234 and make room for future `static mut` unsafe mutable globals.
10235 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10236 * `Clone` implementations can be automatically generated with
10237 `#[deriving(Clone)]`
10238 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10239 instead of `foo as Bar`.
10240 * Fixed length vector types are now written as `[int, .. 3]`
10241 instead of `[int * 3]`.
10242 * Fixed length vector types can express the length as a constant
10243 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10246 * Types with owned pointers or custom destructors move by default,
10247 eliminating the `move` keyword
10248 * All foreign functions are considered unsafe
10249 * &mut is now unaliasable
10250 * Writes to borrowed @mut pointers are prevented dynamically
10252 * The name of the main function can be customized using #[main]
10253 * The default type of an inferred closure is &fn instead of @fn
10254 * `use` statements may no longer be "chained" - they cannot import
10255 identifiers imported by previous `use` statements
10256 * `use` statements are crate relative, importing from the "top"
10257 of the crate by default. Paths may be prefixed with `super::`
10258 or `self::` to change the search behavior.
10259 * Method visibility is inherited from the implementation declaration
10260 * Structural records have been removed
10261 * Many more types can be used in static items, including enums
10262 'static-lifetime pointers and vectors
10263 * Pattern matching over vectors improved and expanded
10264 * Typechecking of closure types has been overhauled to
10265 improve inference and eliminate unsoundness
10266 * Macros leave scope at the end of modules, unless that module is
10267 tagged with #[macro_escape]
10270 * Added big integers to `std::bigint`
10271 * Removed `core::oldcomm` module
10272 * Added pipe-based `core::comm` module
10273 * Numeric traits have been reorganized under `core::num`
10274 * `vec::slice` finally returns a slice
10275 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10276 * Containers reorganized around traits in `core::container`
10277 * `core::dvec` removed, `~[T]` is a drop-in replacement
10278 * `core::send_map` renamed to `core::hashmap`
10279 * `std::map` removed; replaced with `core::hashmap`
10280 * `std::treemap` reimplemented as an owned balanced tree
10281 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10282 * `core::trie` added as a fast ordered map for integer keys
10283 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10284 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10285 overload the comparison operators, whereas `TotalOrd` is used
10286 by certain container types
10289 * Replaced the 'cargo' package manager with 'rustpkg'
10290 * Added all-purpose 'rust' tool
10291 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10292 * rustc now *attempts* to offer spelling suggestions
10293 * Improved support for ARM and Android
10294 * Preliminary MIPS backend
10295 * Improved foreign function ABI implementation for x86, x86_64
10296 * Various memory usage improvements
10297 * Rust code may be embedded in foreign code under limited circumstances
10298 * Inline assembler supported by new asm!() syntax extension.
10301 Version 0.5 (2012-12-21)
10302 ===========================
10304 * ~900 changes, numerous bugfixes
10307 * Removed `<-` move operator
10308 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10309 * Removed old fixed length vector syntax - `[T]/N`
10310 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10311 * Macros may now expand to items and statements
10312 * `a.b()` is always parsed as a method call, never as a field projection
10313 * `Eq` and `IterBytes` implementations can be automatically generated
10314 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10315 * Removed the special crate language for `.rc` files
10316 * Function arguments may consist of any irrefutable pattern
10319 * `&` and `~` pointers may point to objects
10320 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10321 * Enum variants may be structs
10322 * Destructors can be added to all nominal types with the Drop trait
10323 * Structs and nullary enum variants may be constants
10324 * Values that cannot be implicitly copied are now automatically moved
10325 without writing `move` explicitly
10326 * `&T` may now be coerced to `*T`
10327 * Coercions happen in `let` statements as well as function calls
10328 * `use` statements now take crate-relative paths
10329 * The module and type namespaces have been merged so that static
10330 method names can be resolved under the trait in which they are
10333 * Improved support for language features
10334 * Trait inheritance works in many scenarios
10335 * More support for explicit self arguments in methods - `self`, `&self`
10336 `@self`, and `~self` all generally work as expected
10337 * Static methods work in more situations
10338 * Experimental: Traits may declare default methods for the implementations
10342 * New condition handling system in `core::condition`
10343 * Timsort added to `std::sort`
10344 * New priority queue, `std::priority_queue`
10345 * Pipes for serializable types, `std::flatpipes'
10346 * Serialization overhauled to be trait-based
10347 * Expanded `getopts` definitions
10348 * Moved futures to `std`
10349 * More functions are pure now
10350 * `core::comm` renamed to `oldcomm`. Still deprecated
10351 * `rustdoc` and `cargo` are libraries now
10354 * Added a preliminary REPL, `rusti`
10355 * License changed from MIT to dual MIT/APL2
10358 Version 0.4 (2012-10-15)
10359 ==========================
10361 * ~2000 changes, numerous bugfixes
10364 * All keywords are now strict and may not be used as identifiers anywhere
10365 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10366 'of', 'with', 'to', 'class'.
10367 * Classes are replaced with simpler structs
10368 * Explicit method self types
10369 * `ret` became `return` and `alt` became `match`
10370 * `import` is now `use`; `use is now `extern mod`
10371 * `extern mod { ... }` is now `extern { ... }`
10372 * `use mod` is the recommended way to import modules
10373 * `pub` and `priv` replace deprecated export lists
10374 * The syntax of `match` pattern arms now uses fat arrow (=>)
10375 * `main` no longer accepts an args vector; use `os::args` instead
10378 * Trait implementations are now coherent, ala Haskell typeclasses
10379 * Trait methods may be static
10380 * Argument modes are deprecated
10381 * Borrowed pointers are much more mature and recommended for use
10382 * Strings and vectors in the static region are stored in constant memory
10383 * Typestate was removed
10384 * Resolution rewritten to be more reliable
10385 * Support for 'dual-mode' data structures (freezing and thawing)
10388 * Most binary operators can now be overloaded via the traits in
10390 * `std::net::url` for representing URLs
10391 * Sendable hash maps in `core::send_map`
10392 * `core::task' gained a (currently unsafe) task-local storage API
10395 * An efficient new intertask communication primitive called the pipe,
10396 along with a number of higher-level channel types, in `core::pipes`
10397 * `std::arc`, an atomically reference counted, immutable, shared memory
10399 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10400 * Futures are now based on pipes and sendable
10401 * More robust linked task failure
10402 * Improved task builder API
10405 * Improved error reporting
10406 * Preliminary JIT support
10407 * Preliminary work on precise GC
10408 * Extensive architectural improvements to rustc
10409 * Begun a transition away from buggy C++-based reflection (shape) code to
10410 Rust-based (visitor) code
10411 * All hash functions and tables converted to secure, randomized SipHash
10414 Version 0.3 (2012-07-12)
10415 ========================
10417 * ~1900 changes, numerous bugfixes
10419 * New coding conveniences
10420 * Integer-literal suffix inference
10421 * Per-item control over warnings, errors
10422 * #[cfg(windows)] and #[cfg(unix)] attributes
10423 * Documentation comments
10424 * More compact closure syntax
10425 * 'do' expressions for treating higher-order functions as
10427 * *-patterns (wildcard extended to all constructor fields)
10430 * Name resolution pass and exhaustiveness checker rewritten
10431 * Region pointers and borrow checking supersede alias
10433 * Init-ness checking is now provided by a region-based liveness
10434 pass instead of the typestate pass; same for last-use analysis
10435 * Extensive work on region pointers
10437 * Experimental new language features
10438 * Slices and fixed-size, interior-allocated vectors
10439 * #!-comments for lang versioning, shell execution
10440 * Destructors and iface implementation for classes;
10441 type-parameterized classes and class methods
10442 * 'const' type kind for types that can be used to implement
10443 shared-memory concurrency patterns
10447 * Removal of various obsolete features
10448 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10449 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10451 * Constructs: do-while loops ('do' repurposed), fn binding,
10452 resources (replaced by destructors)
10454 * Compiler reorganization
10455 * Syntax-layer of compiler split into separate crate
10456 * Clang (from LLVM project) integrated into build
10457 * Typechecker split into sub-modules
10460 * New time functions
10461 * Extension methods for many built-in types
10462 * Arc: atomic-refcount read-only / exclusive-use shared cells
10463 * Par: parallel map and search routines
10464 * Extensive work on libuv interface
10465 * Much vector code moved to libraries
10466 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10467 #include, #include_str, #include_bin
10469 * Tool improvements
10470 * Cargo automatically resolves dependencies
10473 Version 0.2 (2012-03-29)
10474 =========================
10476 * >1500 changes, numerous bugfixes
10478 * New docs and doc tooling
10480 * New port: FreeBSD x86_64
10482 * Compilation model enhancements
10483 * Generics now specialized, multiply instantiated
10484 * Functions now inlined across separate crates
10486 * Scheduling, stack and threading fixes
10487 * Noticeably improved message-passing performance
10488 * Explicit schedulers
10492 * Experimental new language features
10493 * Operator overloading
10497 * Various language extensions
10498 * C-callback function types: 'crust fn ...'
10499 * Infinite-loop construct: 'loop { ... }'
10500 * Shorten 'mutable' to 'mut'
10501 * Required mutable-local qualifier: 'let mut ...'
10502 * Basic glob-exporting: 'export foo::*;'
10503 * Alt now exhaustive, 'alt check' for runtime-checked
10504 * Block-function form of 'for' loop, with 'break' and 'ret'.
10507 * AST quasi-quote syntax extension
10508 * Revived libuv interface
10509 * New modules: core::{future, iter}, std::arena
10510 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10511 * Extensive cleanup, regularization in libstd, libcore
10514 Version 0.1 (2012-01-20)
10515 ===============================
10517 * Most language features work, including:
10518 * Unique pointers, unique closures, move semantics
10519 * Interface-constrained generics
10520 * Static interface dispatch
10522 * Multithread task scheduling
10523 * Typestate predicates
10524 * Failure unwinding, destructors
10525 * Pattern matching and destructuring assignment
10526 * Lightweight block-lambda syntax
10527 * Preliminary macro-by-example
10529 * Compiler works with the following configurations:
10530 * Linux: x86 and x86_64 hosts and targets
10531 * macOS: x86 and x86_64 hosts and targets
10532 * Windows: x86 hosts and targets
10534 * Cross compilation / multi-target configuration supported.
10536 * Preliminary API-documentation and package-management tools included.
10540 * Documentation is incomplete.
10542 * Performance is below intended target.
10544 * Standard library APIs are subject to extensive change, reorganization.
10546 * Language-level versioning is not yet operational - future code will
10547 break unexpectedly.