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]
73 - [Added `{lib}` as formatting option for `cargo tree` to print the "lib_name" of packages.][cargo/9663]
77 - [Added "Go to item on exact match" search option.][85876]
78 - [The "Implementors" section on traits no longer shows redundant
79 method definitions.][85970]
80 - [Trait implementations are toggled open by default.][86260] This should make the
81 implementations more searchable by tools like `CTRL+F` in your browser.
82 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
83 through type aliases.][86334]
84 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
85 "Trait Implementations" section.][86513]
90 - [std functions that return an `io::Error` will no longer use the
91 `ErrorKind::Other` variant.][85746] This is to better reflect that these
92 kinds of errors could be categorised [into newer more specific `ErrorKind`
93 variants][79965], and that they do not represent a user error.
94 - [Using environment variable names with `process::Command` on Windows now
95 behaves as expected.][85270] Previously using envionment variables with
96 `Command` would cause them to be ASCII-uppercased.
97 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
98 with `rustdoc::`][86849]
100 [86849]: https://github.com/rust-lang/rust/pull/86849
101 [86513]: https://github.com/rust-lang/rust/pull/86513
102 [86334]: https://github.com/rust-lang/rust/pull/86334
103 [86260]: https://github.com/rust-lang/rust/pull/86260
104 [85970]: https://github.com/rust-lang/rust/pull/85970
105 [85876]: https://github.com/rust-lang/rust/pull/85876
106 [83572]: https://github.com/rust-lang/rust/pull/83572
107 [86294]: https://github.com/rust-lang/rust/pull/86294
108 [86858]: https://github.com/rust-lang/rust/pull/86858
109 [86761]: https://github.com/rust-lang/rust/pull/86761
110 [85769]: https://github.com/rust-lang/rust/pull/85769
111 [85746]: https://github.com/rust-lang/rust/pull/85746
112 [85305]: https://github.com/rust-lang/rust/pull/85305
113 [85270]: https://github.com/rust-lang/rust/pull/85270
114 [84111]: https://github.com/rust-lang/rust/pull/84111
115 [83918]: https://github.com/rust-lang/rust/pull/83918
116 [79965]: https://github.com/rust-lang/rust/pull/79965
117 [87370]: https://github.com/rust-lang/rust/pull/87370
118 [87298]: https://github.com/rust-lang/rust/pull/87298
119 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
120 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
121 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
122 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
123 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
124 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
125 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
126 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
127 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
128 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
129 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
130 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
131 [`mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
132 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
133 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
134 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
135 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
136 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
137 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
138 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
139 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
140 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
141 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
144 Version 1.54.0 (2021-07-29)
145 ============================
148 -----------------------
150 - [You can now use macros for values in some built-in attributes.][83366]
151 This primarily allows you to call macros within the `#[doc]` attribute. For
152 example, to include external documentation in your crate, you can now write
155 #![doc = include_str!("README.md")]
158 - [You can now cast between unsized slice types (and types which contain
159 unsized slices) in `const fn`.][85078]
160 - [You can now use multiple generic lifetimes with `impl Trait` where the
161 lifetimes don't explicitly outlive another.][84701] In code this means
162 that you can now have `impl Trait<'a, 'b>` where as before you could
163 only have `impl Trait<'a, 'b> where 'b: 'a`.
166 -----------------------
168 - [Rustc will now search for custom JSON targets in
169 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
170 directory.][83800] You can find your sysroot directory by running
171 `rustc --print sysroot`.
172 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
173 - [You can now use `#[target_feature]` on safe functions when targeting
174 WebAssembly platforms.][84988]
175 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
176 - [Added tier 3\* support for `bpfel-unknown-none`
177 and `bpfeb-unknown-none`.][79608]
179 \* Refer to Rust's [platform support page][platform-support-doc] for more
180 information on Rust's tiered platform support.
183 -----------------------
185 - [`panic::panic_any` will now `#[track_caller]`.][85745]
186 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
187 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
188 - [The implementations of vendor intrinsics in core::arch have been
189 significantly refactored.][83278] The main user-visible changes are
190 a 50% reduction in the size of libcore.rlib and stricter validation
191 of constant operands passed to intrinsics. The latter is technically
192 a breaking change, but allows Rust to more closely match the C vendor
198 - [`BTreeMap::into_keys`]
199 - [`BTreeMap::into_values`]
200 - [`HashMap::into_keys`]
201 - [`HashMap::into_values`]
203 - [`VecDeque::binary_search`]
204 - [`VecDeque::binary_search_by`]
205 - [`VecDeque::binary_search_by_key`]
206 - [`VecDeque::partition_point`]
211 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
212 the dependency graph.][cargo/9520]
213 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
214 in the tree ][cargo/9499]
215 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
216 macro dependencies.][cargo/9488]
217 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
218 This variable points to a directory that integration tests and benches
219 can use as a "scratchpad" for testing filesystem operations.
223 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
224 - [Previously unsound code is no longer permitted where different constructors in branches
225 could require different lifetimes.][85574]
226 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
227 than before and may reject some previously accepted code.
228 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
229 when compiled with `codegen-units = 1`.][86063]
231 [85574]: https://github.com/rust-lang/rust/issues/85574
232 [86831]: https://github.com/rust-lang/rust/issues/86831
233 [86063]: https://github.com/rust-lang/rust/issues/86063
234 [86831]: https://github.com/rust-lang/rust/issues/86831
235 [79608]: https://github.com/rust-lang/rust/pull/79608
236 [84988]: https://github.com/rust-lang/rust/pull/84988
237 [84701]: https://github.com/rust-lang/rust/pull/84701
238 [84072]: https://github.com/rust-lang/rust/pull/84072
239 [85745]: https://github.com/rust-lang/rust/pull/85745
240 [84744]: https://github.com/rust-lang/rust/pull/84744
241 [85078]: https://github.com/rust-lang/rust/pull/85078
242 [84717]: https://github.com/rust-lang/rust/pull/84717
243 [83800]: https://github.com/rust-lang/rust/pull/83800
244 [83366]: https://github.com/rust-lang/rust/pull/83366
245 [83278]: https://github.com/rust-lang/rust/pull/83278
246 [85292]: https://github.com/rust-lang/rust/pull/85292
247 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
248 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
249 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
250 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
251 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
252 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
253 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
254 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
255 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
256 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
257 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
259 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
261 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
263 Version 1.53.0 (2021-06-17)
264 ============================
267 -----------------------
268 - [You can now use unicode for identifiers.][83799] This allows multilingual
269 identifiers but still doesn't allow glyphs that are not considered characters
270 such as `◆` or `🦀`. More specifically you can now use any identifier that
271 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
272 is the same standard as languages like Python, however Rust uses NFC
273 normalization which may be different from other languages.
274 - [You can now specify "or patterns" inside pattern matches.][79278]
275 Previously you could only use `|` (OR) on complete patterns. E.g.
279 matches!(x, Some(1) | Some(2));
281 matches!(x, Some(1 | 2));
283 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
284 has the same semantics as the `:pat` matcher. This is to allow `:pat`
285 to change semantics to being a pattern fragment in a future edition.
288 -----------------------
289 - [Updated the minimum external LLVM version to LLVM 10.][83387]
290 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
291 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
293 \* Refer to Rust's [platform support page][platform-support-doc] for more
294 information on Rust's tiered platform support.
297 -----------------------
298 - [Abort messages will now forward to `android_set_abort_message` on
299 Android platforms when available.][81469]
300 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
301 - [Arrays of any length now implement `IntoIterator`.][84147]
302 Currently calling `.into_iter()` as a method on an array will
303 return `impl Iterator<Item=&T>`, but this may change in a
304 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
305 directly on arrays will provide `impl Iterator<Item=T>` as expected.
306 - [`leading_zeros`, and `trailing_zeros` are now available on all
307 `NonZero` integer types.][84082]
308 - [`{f32, f64}::from_str` now parse and print special values
309 (`NaN`, `-0`) according to IEEE 754.][78618]
310 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
311 - [Add the `BITS` associated constant to all numeric types.][82565]
315 - [`AtomicBool::fetch_update`]
316 - [`AtomicPtr::fetch_update`]
317 - [`BTreeMap::retain`]
318 - [`BTreeSet::retain`]
319 - [`BufReader::seek_relative`]
320 - [`DebugStruct::non_exhaustive`]
323 - [`Duration::is_zero`]
324 - [`Duration::saturating_add`]
325 - [`Duration::saturating_mul`]
326 - [`Duration::saturating_sub`]
327 - [`ErrorKind::Unsupported`]
329 - [`Ordering::is_eq`]
330 - [`Ordering::is_ge`]
331 - [`Ordering::is_gt`]
332 - [`Ordering::is_le`]
333 - [`Ordering::is_lt`]
334 - [`Ordering::is_ne`]
335 - [`OsStr::is_ascii`]
336 - [`OsStr::make_ascii_lowercase`]
337 - [`OsStr::make_ascii_uppercase`]
338 - [`OsStr::to_ascii_lowercase`]
339 - [`OsStr::to_ascii_uppercase`]
340 - [`Peekable::peek_mut`]
341 - [`Rc::decrement_strong_count`]
342 - [`Rc::increment_strong_count`]
343 - [`Vec::extend_from_within`]
344 - [`array::from_mut`]
345 - [`array::from_ref`]
346 - [`cmp::max_by_key`]
348 - [`cmp::min_by_key`]
350 - [`f32::is_subnormal`]
351 - [`f64::is_subnormal`]
354 -----------------------
355 - [Cargo now supports git repositories where the default `HEAD` branch is not
356 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
357 which can handle default branches correctly.
358 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
359 - [The `authors` field is no longer included in `Cargo.toml` for new
360 projects.][cargo/9282]
363 -----------------------
364 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
365 without hyperlinks.][81764]
369 - [Implement token-based handling of attributes during expansion][82608]
370 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
371 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
372 to confusion and potential security vulnerabilities and [is no
373 longer recommended][ietf6943].
374 - [The added `BITS` constant may conflict with external definitions.][85667]
375 In particular, this was known to be a problem in the `lexical-core` crate,
376 but they have published fixes for semantic versions 0.4 through 0.7. To
377 update this dependency alone, use `cargo update -p lexical-core`.
378 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
382 These changes provide no direct user facing benefits, but represent significant
383 improvements to the internals and overall performance of rustc and
386 - [Rework the `std::sys::windows::alloc` implementation.][83065]
387 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
388 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
389 - [Rework rustdoc const type][82873]
391 [85667]: https://github.com/rust-lang/rust/pull/85667
392 [83386]: https://github.com/rust-lang/rust/pull/83386
393 [82771]: https://github.com/rust-lang/rust/pull/82771
394 [84147]: https://github.com/rust-lang/rust/pull/84147
395 [84082]: https://github.com/rust-lang/rust/pull/84082
396 [83799]: https://github.com/rust-lang/rust/pull/83799
397 [83681]: https://github.com/rust-lang/rust/pull/83681
398 [83652]: https://github.com/rust-lang/rust/pull/83652
399 [83387]: https://github.com/rust-lang/rust/pull/83387
400 [82873]: https://github.com/rust-lang/rust/pull/82873
401 [82864]: https://github.com/rust-lang/rust/pull/82864
402 [82608]: https://github.com/rust-lang/rust/pull/82608
403 [82565]: https://github.com/rust-lang/rust/pull/82565
404 [80525]: https://github.com/rust-lang/rust/pull/80525
405 [79278]: https://github.com/rust-lang/rust/pull/79278
406 [78618]: https://github.com/rust-lang/rust/pull/78618
407 [77704]: https://github.com/rust-lang/rust/pull/77704
408 [83941]: https://github.com/rust-lang/rust/pull/83941
409 [83065]: https://github.com/rust-lang/rust/pull/83065
410 [81764]: https://github.com/rust-lang/rust/pull/81764
411 [81469]: https://github.com/rust-lang/rust/pull/81469
412 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
413 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
414 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
415 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
416 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
417 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
418 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
419 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
420 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
421 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
422 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
423 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
424 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
425 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
426 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
427 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
428 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
429 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
430 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
431 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
432 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
433 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
434 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
435 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
436 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
437 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
438 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
439 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
440 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
441 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
442 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
443 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
444 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
445 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
446 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
447 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
448 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
449 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
450 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
451 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
452 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
453 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
456 Version 1.52.1 (2021-05-10)
457 ============================
459 This release disables incremental compilation, unless the user has explicitly
460 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
462 This is due to the widespread, and frequently occuring, breakage encountered by
463 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
464 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
465 newly added incremental verification are still present in past stable versions,
466 and are not yet fixed on any channel. These bugs can lead to miscompilation of
469 These problems only affect incremental builds, so release builds with Cargo
470 should not be affected unless the user has explicitly opted into incremental.
471 Debug and check builds are affected.
473 See [84970] for more details.
475 [84970]: https://github.com/rust-lang/rust/issues/84970
477 Version 1.52.0 (2021-05-06)
478 ============================
482 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
483 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
484 is allowed by default, and may become a warning or hard error in a
486 - [You can now cast mutable references to arrays to a pointer of the same type as
491 - [Upgraded the default LLVM to LLVM 12.][81451]
493 Added tier 3\* support for the following targets.
495 - [`s390x-unknown-linux-musl`][82166]
496 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
497 - [`powerpc-unknown-openbsd`][82733]
499 \* Refer to Rust's [platform support page][platform-support-doc] for more
500 information on Rust's tiered platform support.
504 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
505 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
506 - [`Arc<impl Error>` now implements `error::Error`.][80553]
507 - [All integer division and remainder operations are now `const`.][80962]
511 - [`Arguments::as_str`]
513 - [`char::REPLACEMENT_CHARACTER`]
514 - [`char::UNICODE_VERSION`]
515 - [`char::decode_utf16`]
516 - [`char::from_digit`]
517 - [`char::from_u32_unchecked`]
519 - [`slice::partition_point`]
520 - [`str::rsplit_once`]
521 - [`str::split_once`]
523 The following previously stable APIs are now `const`.
526 - [`char::len_utf16`]
527 - [`char::to_ascii_uppercase`]
528 - [`char::to_ascii_lowercase`]
529 - [`char::eq_ignore_ascii_case`]
530 - [`u8::to_ascii_uppercase`]
531 - [`u8::to_ascii_lowercase`]
532 - [`u8::eq_ignore_ascii_case`]
536 - [Rustdoc lints are now treated as a tool lint, meaning that
537 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
538 Using the old style is still allowed, and will become a warning in
540 - [Rustdoc now supports argument files.][82261]
541 - [Rustdoc now generates smart punctuation for documentation.][79423]
542 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
550 - [You can now pass multiple filters to tests.][81356] E.g.
551 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
552 - [Rustup now distributes PDB symbols for the `std` library on Windows,
553 allowing you to see `std` symbols when debugging.][82218]
557 These changes provide no direct user facing benefits, but represent significant
558 improvements to the internals and overall performance of rustc and
561 - [Check the result cache before the DepGraph when ensuring queries][81855]
562 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
563 - [Only store a LocalDefId in some HIR nodes][81611]
564 - [Store HIR attributes in a side table][79519]
568 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
569 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
570 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
571 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
572 languages in code blocks.][78429]
573 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
574 - [Changes in how proc macros handle whitespace may lead to panics when used
575 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
576 - [Turn `#[derive]` into a regular macro attribute][79078]
578 [84136]: https://github.com/rust-lang/rust/issues/84136
579 [80763]: https://github.com/rust-lang/rust/pull/80763
580 [82166]: https://github.com/rust-lang/rust/pull/82166
581 [82121]: https://github.com/rust-lang/rust/pull/82121
582 [81879]: https://github.com/rust-lang/rust/pull/81879
583 [82261]: https://github.com/rust-lang/rust/pull/82261
584 [82218]: https://github.com/rust-lang/rust/pull/82218
585 [82216]: https://github.com/rust-lang/rust/pull/82216
586 [82202]: https://github.com/rust-lang/rust/pull/82202
587 [81855]: https://github.com/rust-lang/rust/pull/81855
588 [81766]: https://github.com/rust-lang/rust/pull/81766
589 [81744]: https://github.com/rust-lang/rust/pull/81744
590 [81611]: https://github.com/rust-lang/rust/pull/81611
591 [81479]: https://github.com/rust-lang/rust/pull/81479
592 [81451]: https://github.com/rust-lang/rust/pull/81451
593 [81356]: https://github.com/rust-lang/rust/pull/81356
594 [80962]: https://github.com/rust-lang/rust/pull/80962
595 [80553]: https://github.com/rust-lang/rust/pull/80553
596 [80527]: https://github.com/rust-lang/rust/pull/80527
597 [79519]: https://github.com/rust-lang/rust/pull/79519
598 [79423]: https://github.com/rust-lang/rust/pull/79423
599 [79208]: https://github.com/rust-lang/rust/pull/79208
600 [78429]: https://github.com/rust-lang/rust/pull/78429
601 [82733]: https://github.com/rust-lang/rust/pull/82733
602 [82594]: https://github.com/rust-lang/rust/pull/82594
603 [79078]: https://github.com/rust-lang/rust/pull/79078
604 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
605 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
606 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
607 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
608 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
609 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
610 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
611 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
612 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
613 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
614 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
615 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
616 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
617 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
618 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
619 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
620 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
621 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
622 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
623 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
624 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
625 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
627 Version 1.51.0 (2021-03-25)
628 ============================
632 - [You can now parameterize items such as functions, traits, and `struct`s by constant
633 values in addition to by types and lifetimes.][79135] Also known as "const generics"
634 E.g. you can now write the following. Note: Only values of primitive integers,
635 `bool`, or `char` types are currently permitted.
637 struct GenericArray<T, const LENGTH: usize> {
641 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
642 const fn last(&self) -> Option<&T> {
646 Some(&self.inner[LENGTH - 1])
656 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
657 This option controls whether debug information is split across multiple files
658 or packed into a single file. **Note** This option is unstable on other platforms.
659 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
660 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
661 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
662 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
664 \* Refer to Rust's [platform support page][platform-support-doc] for more
665 information on Rust's tiered platform support.
670 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
671 - [`str` now implements `AsMut<str>`.][80279]
672 - [`u64` and `u128` now implement `From<char>`.][79502]
673 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
674 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
675 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
676 - [`io::Empty` now implements `io::Seek`.][78044]
677 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
678 `T: ?Sized` types.][80764]
679 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
685 - [`Arc::decrement_strong_count`]
686 - [`Arc::increment_strong_count`]
687 - [`Once::call_once_force`]
688 - [`Peekable::next_if_eq`]
689 - [`Peekable::next_if`]
690 - [`Seek::stream_position`]
691 - [`array::IntoIter`]
692 - [`panic::panic_any`]
694 - [`ptr::addr_of_mut!`]
695 - [`slice::fill_with`]
696 - [`slice::split_inclusive_mut`]
697 - [`slice::split_inclusive`]
698 - [`slice::strip_prefix`]
699 - [`slice::strip_suffix`]
700 - [`str::split_inclusive`]
701 - [`sync::OnceState`]
703 - [`VecDeque::range`]
704 - [`VecDeque::range_mut`]
708 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
709 codegen option.][cargo/9112]
710 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
711 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
712 to avoid unifying features of dependencies where that unification could be unwanted.
713 Such as using the same dependency with a `std` feature in a build scripts and
714 proc-macros, while using the `no-std` feature in the final binary. See the
715 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
720 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
721 - [You can now provide a `--default-theme` flag which sets the default theme to use for
722 documentation.][79642]
724 Various improvements to intra-doc links:
726 - [You can link to non-path primitives such as `slice`.][80181]
727 - [You can link to associated items.][74489]
728 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
732 - [You can now pass `--include-ignored` to tests (e.g. with
733 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
738 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
739 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
741 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
742 for the distributed artifacts.][81521]
743 - `armv5te-unknown-linux-gnueabi`
744 - `sparc64-unknown-linux-gnu`
745 - `thumbv7neon-unknown-linux-gnueabihf`
746 - `armv7-unknown-linux-gnueabi`
747 - `x86_64-unknown-linux-gnux32`
748 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
753 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
755 [79135]: https://github.com/rust-lang/rust/pull/79135
756 [74489]: https://github.com/rust-lang/rust/pull/74489
757 [76934]: https://github.com/rust-lang/rust/pull/76934
758 [79570]: https://github.com/rust-lang/rust/pull/79570
759 [80181]: https://github.com/rust-lang/rust/pull/80181
760 [79642]: https://github.com/rust-lang/rust/pull/79642
761 [80945]: https://github.com/rust-lang/rust/pull/80945
762 [80279]: https://github.com/rust-lang/rust/pull/80279
763 [80053]: https://github.com/rust-lang/rust/pull/80053
764 [79502]: https://github.com/rust-lang/rust/pull/79502
765 [75180]: https://github.com/rust-lang/rust/pull/75180
766 [79135]: https://github.com/rust-lang/rust/pull/79135
767 [81521]: https://github.com/rust-lang/rust/pull/81521
768 [80968]: https://github.com/rust-lang/rust/pull/80968
769 [80959]: https://github.com/rust-lang/rust/pull/80959
770 [80718]: https://github.com/rust-lang/rust/pull/80718
771 [80653]: https://github.com/rust-lang/rust/pull/80653
772 [80579]: https://github.com/rust-lang/rust/pull/80579
773 [79998]: https://github.com/rust-lang/rust/pull/79998
774 [78044]: https://github.com/rust-lang/rust/pull/78044
775 [81455]: https://github.com/rust-lang/rust/pull/81455
776 [80764]: https://github.com/rust-lang/rust/pull/80764
777 [80749]: https://github.com/rust-lang/rust/pull/80749
778 [80662]: https://github.com/rust-lang/rust/pull/80662
779 [79134]: https://github.com/rust-lang/rust/pull/79134
780 [80966]: https://github.com/rust-lang/rust/pull/80966
781 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
782 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
783 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
784 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
785 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
786 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
787 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
788 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
789 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
790 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
791 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
792 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
793 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
794 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
795 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
796 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
797 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
798 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
799 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
800 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
801 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
802 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
803 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
805 Version 1.50.0 (2021-02-11)
806 ============================
809 -----------------------
810 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
811 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
812 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
815 -----------------------
816 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
817 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
818 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
819 - [Dropped support for all cloudabi targets.][78439]
821 \* Refer to Rust's [platform support page][platform-support-doc] for more
822 information on Rust's tiered platform support.
825 -----------------------
827 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
828 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
829 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
830 This value cannot be a valid file descriptor, and now means `Option<File>` takes
831 up the same amount of space as `File`.
837 - [`btree_map::Entry::or_insert_with_key`]
840 - [`hash_map::Entry::or_insert_with_key`]
844 - [`UnsafeCell::get_mut`]
846 The following previously stable methods are now `const`.
848 - [`IpAddr::is_ipv4`]
849 - [`IpAddr::is_ipv6`]
850 - [`IpAddr::is_unspecified`]
851 - [`IpAddr::is_loopback`]
852 - [`IpAddr::is_multicast`]
853 - [`Ipv4Addr::octets`]
854 - [`Ipv4Addr::is_loopback`]
855 - [`Ipv4Addr::is_private`]
856 - [`Ipv4Addr::is_link_local`]
857 - [`Ipv4Addr::is_multicast`]
858 - [`Ipv4Addr::is_broadcast`]
859 - [`Ipv4Addr::is_documentation`]
860 - [`Ipv4Addr::to_ipv6_compatible`]
861 - [`Ipv4Addr::to_ipv6_mapped`]
862 - [`Ipv6Addr::segments`]
863 - [`Ipv6Addr::is_unspecified`]
864 - [`Ipv6Addr::is_loopback`]
865 - [`Ipv6Addr::is_multicast`]
866 - [`Ipv6Addr::to_ipv4`]
869 - [`Layout::from_size_align`]
870 - `pow` for all integer types.
871 - `checked_pow` for all integer types.
872 - `saturating_pow` for all integer types.
873 - `wrapping_pow` for all integer types.
874 - `next_power_of_two` for all unsigned integer types.
875 - `checked_next_power_of_two` for all unsigned integer types.
878 -----------------------
880 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
881 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
882 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
883 contents of that directory for changes.][cargo/8973]
884 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
889 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
890 - [Running tests will now print the total time taken to execute.][75752]
895 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
896 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
897 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
898 unhygenic `macro_rules!` macros.][79472]
899 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
900 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
901 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
902 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
903 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
904 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
906 [74989]: https://github.com/rust-lang/rust/pull/74989
907 [79261]: https://github.com/rust-lang/rust/pull/79261
908 [79896]: https://github.com/rust-lang/rust/pull/79896
909 [79484]: https://github.com/rust-lang/rust/pull/79484
910 [79472]: https://github.com/rust-lang/rust/pull/79472
911 [79270]: https://github.com/rust-lang/rust/pull/79270
912 [79003]: https://github.com/rust-lang/rust/pull/79003
913 [78864]: https://github.com/rust-lang/rust/pull/78864
914 [78636]: https://github.com/rust-lang/rust/pull/78636
915 [78439]: https://github.com/rust-lang/rust/pull/78439
916 [78343]: https://github.com/rust-lang/rust/pull/78343
917 [78296]: https://github.com/rust-lang/rust/pull/78296
918 [78068]: https://github.com/rust-lang/rust/pull/78068
919 [75752]: https://github.com/rust-lang/rust/pull/75752
920 [74699]: https://github.com/rust-lang/rust/pull/74699
921 [78142]: https://github.com/rust-lang/rust/pull/78142
922 [77484]: https://github.com/rust-lang/rust/pull/77484
923 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
924 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
925 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
926 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
927 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
928 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
929 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
930 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
931 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
932 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
933 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
934 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
935 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
936 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
937 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
938 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
939 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
940 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
941 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
942 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
943 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
944 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
945 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
946 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
947 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
948 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
949 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
950 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
951 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
952 [`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
953 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
954 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
955 [`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
956 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
959 Version 1.49.0 (2020-12-31)
960 ============================
963 -----------------------
965 - [Unions can now implement `Drop`, and you can now have a field in a union
966 with `ManuallyDrop<T>`.][77547]
967 - [You can now cast uninhabited enums to integers.][76199]
968 - [You can now bind by reference and by move in patterns.][76119] This
969 allows you to selectively borrow individual components of a type. E.g.
977 let person = Person {
978 name: String::from("Alice"),
982 // `name` is moved out of person, but `age` is referenced.
983 let Person { name, ref age } = person;
984 println!("{} {}", name, age);
988 -----------------------
990 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
991 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
992 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
993 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
994 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
995 - [Output from threads spawned in tests is now captured.][78227]
996 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
998 \* Refer to Rust's [platform support page][platform-support-doc] for more
999 information on Rust's tiered platform support.
1002 -----------------------
1004 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1005 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1010 - [`slice::select_nth_unstable`]
1011 - [`slice::select_nth_unstable_by`]
1012 - [`slice::select_nth_unstable_by_key`]
1014 The following previously stable methods are now `const`.
1016 - [`Poll::is_ready`]
1017 - [`Poll::is_pending`]
1020 -----------------------
1021 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1022 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1023 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1024 variable will be set if the crate being built is one the user selected to build, either
1025 with `-p` or through defaults.
1026 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1032 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1033 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1034 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1035 Previously such invalid or unused attributes could be ignored.
1036 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1037 read [this post about the changes][rustdoc-ws-post] for more details.
1038 - [Trait bounds are no longer inferred for associated types.][79904]
1042 These changes provide no direct user facing benefits, but represent significant
1043 improvements to the internals and overall performance of rustc and
1046 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1047 Local Storage model.][78201]
1048 - [Calculate visibilities once in resolve.][78077]
1049 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1050 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1053 [75991]: https://github.com/rust-lang/rust/pull/75991
1054 [78951]: https://github.com/rust-lang/rust/pull/78951
1055 [78848]: https://github.com/rust-lang/rust/pull/78848
1056 [78746]: https://github.com/rust-lang/rust/pull/78746
1057 [78376]: https://github.com/rust-lang/rust/pull/78376
1058 [78228]: https://github.com/rust-lang/rust/pull/78228
1059 [78227]: https://github.com/rust-lang/rust/pull/78227
1060 [78201]: https://github.com/rust-lang/rust/pull/78201
1061 [78109]: https://github.com/rust-lang/rust/pull/78109
1062 [78077]: https://github.com/rust-lang/rust/pull/78077
1063 [77997]: https://github.com/rust-lang/rust/pull/77997
1064 [77703]: https://github.com/rust-lang/rust/pull/77703
1065 [77547]: https://github.com/rust-lang/rust/pull/77547
1066 [77015]: https://github.com/rust-lang/rust/pull/77015
1067 [76199]: https://github.com/rust-lang/rust/pull/76199
1068 [76119]: https://github.com/rust-lang/rust/pull/76119
1069 [75914]: https://github.com/rust-lang/rust/pull/75914
1070 [79004]: https://github.com/rust-lang/rust/pull/79004
1071 [78676]: https://github.com/rust-lang/rust/pull/78676
1072 [79904]: https://github.com/rust-lang/rust/issues/79904
1073 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1074 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1075 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1076 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1077 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1078 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1079 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1080 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1081 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1082 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1083 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1085 Version 1.48.0 (2020-11-19)
1086 ==========================
1091 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1092 is still rejected *semantically*, but can now be parsed by procedural macros.
1096 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1097 `rustc` whether to link its own C runtime and libraries or to rely on a external
1098 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1099 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1100 Note: If you're using cargo you must explicitly pass the `--target` flag.
1101 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1103 \* Refer to Rust's [platform support page][platform-support-doc] for more
1104 information on Rust's tiered platform support.
1108 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1109 and `&Stderr`.][76275]
1110 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1111 - [The `matches!` macro now supports having a trailing comma.][74880]
1112 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1113 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1117 - [`slice::as_ptr_range`]
1118 - [`slice::as_mut_ptr_range`]
1119 - [`VecDeque::make_contiguous`]
1120 - [`future::pending`]
1123 The following previously stable methods are now `const fn`'s:
1125 - [`Option::is_some`]
1126 - [`Option::is_none`]
1127 - [`Option::as_ref`]
1129 - [`Result::is_err`]
1130 - [`Result::as_ref`]
1131 - [`Ordering::reverse`]
1132 - [`Ordering::then`]
1139 - [You can now link to items in `rustdoc` using the intra-doc link
1140 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1141 a link to `std::future`'s documentation. See ["Linking to items by
1142 name"][intradoc-links] for more information.
1143 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1144 when searching through `rustdoc`'s UI.][75740]
1148 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1149 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1150 promoted to `'static` lifetime any more inside `const fn`s.
1151 - [Associated type bindings on trait objects are now verified to meet the bounds
1152 declared on the trait when checking that they implement the trait.][27675]
1153 - [When trait bounds on associated types or opaque types are ambiguous, the
1154 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1155 - [Fixed recursive nonterminals not being expanded in macros during
1156 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1157 correctly handling recursive nonterminal tokens.
1158 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1159 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1160 in places where they have no effect.][73461]
1161 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1162 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1163 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1164 disallow zero-initialization.][71274]
1165 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1166 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1167 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1168 see the [`catch_unwind`] documentation for further information.
1174 These changes provide no direct user facing benefits, but represent significant
1175 improvements to the internals and overall performance of rustc and
1178 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1179 You can continue building with `make` by setting `ninja=false` in
1181 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1182 - [Made `ensure_sufficient_stack()` non-generic][76680]
1184 [78143]: https://github.com/rust-lang/rust/issues/78143
1185 [76680]: https://github.com/rust-lang/rust/pull/76680/
1186 [76030]: https://github.com/rust-lang/rust/pull/76030/
1187 [70212]: https://github.com/rust-lang/rust/pull/70212/
1188 [27675]: https://github.com/rust-lang/rust/issues/27675/
1189 [54121]: https://github.com/rust-lang/rust/issues/54121/
1190 [71274]: https://github.com/rust-lang/rust/pull/71274/
1191 [77386]: https://github.com/rust-lang/rust/pull/77386/
1192 [77153]: https://github.com/rust-lang/rust/pull/77153/
1193 [77055]: https://github.com/rust-lang/rust/pull/77055/
1194 [76275]: https://github.com/rust-lang/rust/pull/76275/
1195 [76310]: https://github.com/rust-lang/rust/pull/76310/
1196 [76420]: https://github.com/rust-lang/rust/pull/76420/
1197 [76158]: https://github.com/rust-lang/rust/pull/76158/
1198 [75857]: https://github.com/rust-lang/rust/pull/75857/
1199 [75585]: https://github.com/rust-lang/rust/pull/75585/
1200 [75740]: https://github.com/rust-lang/rust/pull/75740/
1201 [75502]: https://github.com/rust-lang/rust/pull/75502/
1202 [74880]: https://github.com/rust-lang/rust/pull/74880/
1203 [74922]: https://github.com/rust-lang/rust/pull/74922/
1204 [74430]: https://github.com/rust-lang/rust/pull/74430/
1205 [74194]: https://github.com/rust-lang/rust/pull/74194/
1206 [73461]: https://github.com/rust-lang/rust/pull/73461/
1207 [73166]: https://github.com/rust-lang/rust/pull/73166/
1208 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1209 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1210 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1211 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1212 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1213 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1214 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1215 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1216 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1217 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1218 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1219 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1220 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1221 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1222 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1225 Version 1.47.0 (2020-10-08)
1226 ==========================
1230 - [Closures will now warn when not used.][74869]
1234 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1235 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1237 - [Upgraded to LLVM 11.][73526]
1238 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1239 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1240 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1242 \* Refer to Rust's [platform support page][platform-support-doc] for more
1243 information on Rust's tiered platform support.
1247 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1248 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1249 those of length less than 33.][74060]
1250 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1251 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1252 `PartialEq`, and `PartialOrd`.][73583]
1256 - [`Ident::new_raw`]
1257 - [`Range::is_empty`]
1258 - [`RangeInclusive::is_empty`]
1259 - [`Result::as_deref`]
1260 - [`Result::as_deref_mut`]
1262 - [`pointer::offset_from`]
1266 The following previously stable APIs have now been made const.
1268 - [The `new` method for all `NonZero` integers.][73858]
1269 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1270 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1271 methods for all integers.][73858]
1272 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1273 signed integers.][73858]
1274 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1275 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1276 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1277 `is_ascii_control` methods for `char` and `u8`.][73858]
1281 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1282 You can override this by setting the following in your `Cargo.toml`.
1284 [profile.release.build-override]
1287 - [`cargo-help` will now display man pages for commands rather just the
1288 `--help` text.][cargo/8456]
1289 - [`cargo-metadata` now emits a `test` field indicating if a target has
1290 tests enabled.][cargo/8478]
1291 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1292 - [`cargo-publish` will now use an alternative registry by default if it's the
1293 only registry specified in `package.publish`.][cargo/8571]
1297 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1298 type based search.][75366]
1299 - [Added the Ayu theme to rustdoc.][71237]
1303 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1304 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1305 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1306 help to preserve more span information.][73084] These changes may cause
1307 compiliation errors if your macro was unhygenic or didn't correctly handle
1309 - [Moved support for the CloudABI target to tier 3.][75568]
1310 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1311 - [Added the `rustc-docs` component.][75560] This allows you to install
1312 and read the documentation for the compiler internal APIs. (Currently only
1313 available for `x86_64-unknown-linux-gnu`.)
1318 - [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.
1320 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1321 [75048]: https://github.com/rust-lang/rust/pull/75048/
1322 [74163]: https://github.com/rust-lang/rust/pull/74163/
1323 [71237]: https://github.com/rust-lang/rust/pull/71237/
1324 [74869]: https://github.com/rust-lang/rust/pull/74869/
1325 [73858]: https://github.com/rust-lang/rust/pull/73858/
1326 [75716]: https://github.com/rust-lang/rust/pull/75716/
1327 [75908]: https://github.com/rust-lang/rust/pull/75908/
1328 [75516]: https://github.com/rust-lang/rust/pull/75516/
1329 [75560]: https://github.com/rust-lang/rust/pull/75560/
1330 [75568]: https://github.com/rust-lang/rust/pull/75568/
1331 [75366]: https://github.com/rust-lang/rust/pull/75366/
1332 [75204]: https://github.com/rust-lang/rust/pull/75204/
1333 [74650]: https://github.com/rust-lang/rust/pull/74650/
1334 [74419]: https://github.com/rust-lang/rust/pull/74419/
1335 [73964]: https://github.com/rust-lang/rust/pull/73964/
1336 [74021]: https://github.com/rust-lang/rust/pull/74021/
1337 [74060]: https://github.com/rust-lang/rust/pull/74060/
1338 [73893]: https://github.com/rust-lang/rust/pull/73893/
1339 [73526]: https://github.com/rust-lang/rust/pull/73526/
1340 [73583]: https://github.com/rust-lang/rust/pull/73583/
1341 [73084]: https://github.com/rust-lang/rust/pull/73084/
1342 [73197]: https://github.com/rust-lang/rust/pull/73197/
1343 [72488]: https://github.com/rust-lang/rust/pull/72488/
1344 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1345 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1346 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1347 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1348 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1349 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1350 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1351 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1352 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1353 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1354 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1355 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1356 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1357 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1358 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1361 Version 1.46.0 (2020-08-27)
1362 ==========================
1366 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1367 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1368 const functions.][73862]
1369 - [The `#[track_caller]` attribute can now be added to functions to use the
1370 function's caller's location information for panic messages.][72445]
1371 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1372 `x.0.0` over `(x.0).0`.
1373 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1374 You currently can't use `mem::transmute` in constant functions.
1378 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1379 - [Enabled static "Position Independent Executables" by default
1380 for `x86_64-unknown-linux-musl`.][70740]
1384 - [`mem::forget` is now a `const fn`.][73887]
1385 - [`String` now implements `From<char>`.][73466]
1386 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1387 integer types.][73032]
1388 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1389 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1390 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1391 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1392 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1393 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1398 - [`vec::Drain::as_slice`]
1402 Added a number of new environment variables that are now available when
1403 compiling your crate.
1405 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1406 the specific binary being compiled and the name of the crate.
1407 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1408 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1412 - [The target configuration option `abi_blacklist` has been renamed
1413 to `unsupported_abis`.][74150] The old name will still continue to work.
1414 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1415 This was previously accepted but will become a hard error in a future release.
1416 - [Rustc will fail to compile if you have a struct with
1417 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1419 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1420 ensure that spans have the correct information, and may cause breakage if you
1421 were relying on receiving spans with dummy information.
1422 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1423 a legacy installer that was replaced by a MSI installer a few years ago but
1424 was still being built.
1425 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1426 - [Rustc will no longer accept overlapping trait implementations that only
1427 differ in how the lifetime was bound.][72493]
1428 - [Rustc now correctly relates the lifetime of an existential associated
1429 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1430 you to pass a shorter lifetime than expected.
1431 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1432 The library will need to be installed for `rustc` to work, even though we
1433 expect it to be already available on most systems.
1434 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1436 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1437 exact output returned by rustc's pretty printing is an unstable
1438 implementation detail: we recommend any macro relying on it to switch to a
1439 more robust parsing system.
1441 [75453]: https://github.com/rust-lang/rust/issues/75453/
1442 [74820]: https://github.com/rust-lang/rust/issues/74820/
1443 [74420]: https://github.com/rust-lang/rust/issues/74420/
1444 [74109]: https://github.com/rust-lang/rust/pull/74109/
1445 [74150]: https://github.com/rust-lang/rust/pull/74150/
1446 [73862]: https://github.com/rust-lang/rust/pull/73862/
1447 [73887]: https://github.com/rust-lang/rust/pull/73887/
1448 [73466]: https://github.com/rust-lang/rust/pull/73466/
1449 [73516]: https://github.com/rust-lang/rust/pull/73516/
1450 [73293]: https://github.com/rust-lang/rust/pull/73293/
1451 [73007]: https://github.com/rust-lang/rust/pull/73007/
1452 [73032]: https://github.com/rust-lang/rust/pull/73032/
1453 [72920]: https://github.com/rust-lang/rust/pull/72920/
1454 [72569]: https://github.com/rust-lang/rust/pull/72569/
1455 [72583]: https://github.com/rust-lang/rust/pull/72583/
1456 [72584]: https://github.com/rust-lang/rust/pull/72584/
1457 [72717]: https://github.com/rust-lang/rust/pull/72717/
1458 [72437]: https://github.com/rust-lang/rust/pull/72437/
1459 [72445]: https://github.com/rust-lang/rust/pull/72445/
1460 [72486]: https://github.com/rust-lang/rust/pull/72486/
1461 [72493]: https://github.com/rust-lang/rust/pull/72493/
1462 [72331]: https://github.com/rust-lang/rust/pull/72331/
1463 [71896]: https://github.com/rust-lang/rust/pull/71896/
1464 [71660]: https://github.com/rust-lang/rust/pull/71660/
1465 [71322]: https://github.com/rust-lang/rust/pull/71322/
1466 [70740]: https://github.com/rust-lang/rust/pull/70740/
1467 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1468 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1469 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1470 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1471 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1474 Version 1.45.2 (2020-08-03)
1475 ==========================
1477 * [Fix bindings in tuple struct patterns][74954]
1478 * [Fix track_caller integration with trait objects][74784]
1480 [74954]: https://github.com/rust-lang/rust/issues/74954
1481 [74784]: https://github.com/rust-lang/rust/issues/74784
1484 Version 1.45.1 (2020-07-30)
1485 ==========================
1487 * [Fix const propagation with references.][73613]
1488 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1489 * [Avoid spurious implicit region bound.][74509]
1490 * [Install clippy on x.py install][74457]
1492 [73613]: https://github.com/rust-lang/rust/pull/73613
1493 [73078]: https://github.com/rust-lang/rust/issues/73078
1494 [74509]: https://github.com/rust-lang/rust/pull/74509
1495 [74457]: https://github.com/rust-lang/rust/pull/74457
1498 Version 1.45.0 (2020-07-16)
1499 ==========================
1503 - [Out of range float to int conversions using `as` has been defined as a saturating
1504 conversion.][71269] This was previously undefined behaviour, but you can use the
1505 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1506 may be desirable in rare performance sensitive situations.
1507 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1508 using `u64`.][70705]
1509 - [Function like procedural macros can now be used in expression, pattern, and statement
1510 positions.][68717] This means you can now use a function-like procedural macro
1511 anywhere you can use a declarative (`macro_rules!`) macro.
1515 - [You can now override individual target features through the `target-feature`
1516 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1517 equivalent to `-C target-feature=+avx2,+fma`.
1518 - [Added the `force-unwind-tables` flag.][69984] This option allows
1519 rustc to always generate unwind tables regardless of panic strategy.
1520 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1521 to include LLVM bitcode into generated `rlib`s (this is on by default).
1522 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1523 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1524 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1525 - [Upgraded to LLVM 10.][67759]
1527 \* Refer to Rust's [platform support page][platform-support-doc] for more
1528 information on Rust's tiered platform support.
1533 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1535 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1536 - [You can now use `char` with
1537 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1538 a range of codepoints.][72413] E.g.
1539 you can now write the following;
1541 for ch in 'a'..='z' {
1545 // Prints "abcdefghijklmnopqrstuvwxyz"
1547 - [`OsString` now implements `FromStr`.][71662]
1548 - [The `saturating_neg` method has been added to all signed integer primitive
1549 types, and the `saturating_abs` method has been added for all integer
1550 primitive types.][71886]
1551 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1552 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1554 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1555 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1556 integer types.][69813]
1557 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1558 integer types.][72324]
1559 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1564 - [`BTreeMap::remove_entry`]
1566 - [`rc::Weak::as_ptr`]
1567 - [`rc::Weak::from_raw`]
1568 - [`rc::Weak::into_raw`]
1569 - [`str::strip_prefix`]
1570 - [`str::strip_suffix`]
1571 - [`sync::Weak::as_ptr`]
1572 - [`sync::Weak::from_raw`]
1573 - [`sync::Weak::into_raw`]
1574 - [`char::UNICODE_VERSION`]
1575 - [`Span::resolved_at`]
1576 - [`Span::located_at`]
1577 - [`Span::mixed_site`]
1578 - [`unix::process::CommandExt::arg0`]
1583 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1588 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1589 `~~outdated information~~` becomes "~~outdated information~~".
1590 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1594 - [Trying to self initialize a static value (that is creating a value using
1595 itself) is unsound and now causes a compile error.][71140]
1596 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1597 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1598 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1599 previously undocumented and not intended for public use. Rustdoc still provides
1600 a non-zero exit code on errors.
1601 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1602 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1603 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1604 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1605 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1609 - [Make clippy a git subtree instead of a git submodule][70655]
1610 - [Unify the undo log of all snapshot types][69464]
1612 [71848]: https://github.com/rust-lang/rust/issues/71848/
1613 [73420]: https://github.com/rust-lang/rust/issues/73420/
1614 [72324]: https://github.com/rust-lang/rust/pull/72324/
1615 [71843]: https://github.com/rust-lang/rust/pull/71843/
1616 [71886]: https://github.com/rust-lang/rust/pull/71886/
1617 [72234]: https://github.com/rust-lang/rust/pull/72234/
1618 [72239]: https://github.com/rust-lang/rust/pull/72239/
1619 [72397]: https://github.com/rust-lang/rust/pull/72397/
1620 [72413]: https://github.com/rust-lang/rust/pull/72413/
1621 [72014]: https://github.com/rust-lang/rust/pull/72014/
1622 [72062]: https://github.com/rust-lang/rust/pull/72062/
1623 [72094]: https://github.com/rust-lang/rust/pull/72094/
1624 [72133]: https://github.com/rust-lang/rust/pull/72133/
1625 [67759]: https://github.com/rust-lang/rust/pull/67759/
1626 [71900]: https://github.com/rust-lang/rust/pull/71900/
1627 [71928]: https://github.com/rust-lang/rust/pull/71928/
1628 [71662]: https://github.com/rust-lang/rust/pull/71662/
1629 [71716]: https://github.com/rust-lang/rust/pull/71716/
1630 [71447]: https://github.com/rust-lang/rust/pull/71447/
1631 [71269]: https://github.com/rust-lang/rust/pull/71269/
1632 [71095]: https://github.com/rust-lang/rust/pull/71095/
1633 [71140]: https://github.com/rust-lang/rust/pull/71140/
1634 [70655]: https://github.com/rust-lang/rust/pull/70655/
1635 [70705]: https://github.com/rust-lang/rust/pull/70705/
1636 [69984]: https://github.com/rust-lang/rust/pull/69984/
1637 [69813]: https://github.com/rust-lang/rust/pull/69813/
1638 [69464]: https://github.com/rust-lang/rust/pull/69464/
1639 [68717]: https://github.com/rust-lang/rust/pull/68717/
1640 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1641 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1642 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1643 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1644 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1645 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1646 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1647 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1648 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1649 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1650 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1651 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1652 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1653 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1654 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1655 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1656 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1659 Version 1.44.1 (2020-06-18)
1660 ===========================
1662 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1663 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1664 * [Fix crashes when finding backtrace on macOS.][71397]
1665 * [Clippy applies lint levels into different files.][clippy/5356]
1667 [71397]: https://github.com/rust-lang/rust/issues/71397
1668 [73078]: https://github.com/rust-lang/rust/issues/73078
1669 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1670 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1673 Version 1.44.0 (2020-06-04)
1674 ==========================
1678 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1679 - [Added the `unused_braces` lint.][70081]
1681 **Syntax-only changes**
1683 - [Expansion-driven outline module parsing][69838]
1688 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1693 These are still rejected semantically, so you will likely receive an error but
1694 these changes can be seen and parsed by macros and conditional compilation.
1698 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1699 Additionally when in incremental mode rustc defaults to 256 codegen units.
1700 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1701 a panic is thrown.][67502]
1702 - [Added tier 3\* support for the `aarch64-unknown-none` and
1703 `aarch64-unknown-none-softfloat` targets.][68334]
1704 - [Added tier 3 support for `arm64-apple-tvos` and
1705 `x86_64-apple-tvos` targets.][68191]
1710 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1711 `vec![]` to be able to be used in `const` contexts.
1712 - [`convert::Infallible` now implements `Hash`.][70281]
1713 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1714 a `&mut OsStr`.][70048]
1715 - [Unicode 13 is now supported.][69929]
1716 - [`String` now implements `From<&mut str>`.][69661]
1717 - [`IoSlice` now implements `Copy`.][69403]
1718 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1719 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1720 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1721 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1722 integer types.][69373]
1726 - [`PathBuf::with_capacity`]
1727 - [`PathBuf::capacity`]
1728 - [`PathBuf::clear`]
1729 - [`PathBuf::reserve`]
1730 - [`PathBuf::reserve_exact`]
1731 - [`PathBuf::shrink_to_fit`]
1732 - [`f32::to_int_unchecked`]
1733 - [`f64::to_int_unchecked`]
1734 - [`Layout::align_to`]
1735 - [`Layout::pad_to_align`]
1737 - [`Layout::extend`]
1741 - [Added the `cargo tree` command which will print a tree graph of
1742 your dependencies.][cargo/8062] E.g.
1744 mdbook v0.3.2 (/Users/src/rust/mdbook)
1746 │ ├── html5ever v0.24.0
1748 │ │ │ └── cfg-if v0.1.9
1750 │ │ └── markup5ever v0.9.0
1751 │ │ ├── log v0.4.8 (*)
1753 │ │ │ └── phf_shared v0.7.24
1754 │ │ │ ├── siphasher v0.2.3
1755 │ │ │ └── unicase v1.4.2
1756 │ │ │ [build-dependencies]
1757 │ │ │ └── version_check v0.1.5
1760 You can also display dependencies on multiple versions of the same crate with
1761 `cargo tree -d` (short for `cargo tree --duplicates`).
1765 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1766 the version in the sidebar.][69494]
1770 - [Rustc now correctly generates static libraries on Windows GNU targets with
1771 the `.a` extension, rather than the previous `.lib`.][70937]
1772 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1773 - [The `file_name` property in JSON output of macro errors now points the actual
1774 source file rather than the previous format of `<NAME macros>`.][70969]
1775 **Note:** this may not point to a file that actually exists on the user's system.
1776 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1777 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1778 not allow zero initialization such as `NonZeroU8`.][66059] This was
1779 previously a warning.
1780 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1781 operator has been defined as a saturating operation.][71269] This was previously
1782 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1783 continue using the current behaviour, which may be desirable in rare performance
1784 sensitive situations.
1788 These changes provide no direct user facing benefits, but represent significant
1789 improvements to the internals and overall performance of rustc and
1792 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1793 - [Replace big JS dict with JSON parsing.][71250]
1795 [69373]: https://github.com/rust-lang/rust/pull/69373/
1796 [66059]: https://github.com/rust-lang/rust/pull/66059/
1797 [68191]: https://github.com/rust-lang/rust/pull/68191/
1798 [68899]: https://github.com/rust-lang/rust/pull/68899/
1799 [71147]: https://github.com/rust-lang/rust/pull/71147/
1800 [71250]: https://github.com/rust-lang/rust/pull/71250/
1801 [70937]: https://github.com/rust-lang/rust/pull/70937/
1802 [70969]: https://github.com/rust-lang/rust/pull/70969/
1803 [70632]: https://github.com/rust-lang/rust/pull/70632/
1804 [70281]: https://github.com/rust-lang/rust/pull/70281/
1805 [70345]: https://github.com/rust-lang/rust/pull/70345/
1806 [70048]: https://github.com/rust-lang/rust/pull/70048/
1807 [70081]: https://github.com/rust-lang/rust/pull/70081/
1808 [70156]: https://github.com/rust-lang/rust/pull/70156/
1809 [71269]: https://github.com/rust-lang/rust/pull/71269/
1810 [69838]: https://github.com/rust-lang/rust/pull/69838/
1811 [69929]: https://github.com/rust-lang/rust/pull/69929/
1812 [69661]: https://github.com/rust-lang/rust/pull/69661/
1813 [69778]: https://github.com/rust-lang/rust/pull/69778/
1814 [69494]: https://github.com/rust-lang/rust/pull/69494/
1815 [69403]: https://github.com/rust-lang/rust/pull/69403/
1816 [69033]: https://github.com/rust-lang/rust/pull/69033/
1817 [68692]: https://github.com/rust-lang/rust/pull/68692/
1818 [68334]: https://github.com/rust-lang/rust/pull/68334/
1819 [67502]: https://github.com/rust-lang/rust/pull/67502/
1820 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1821 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1822 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1823 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1824 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1825 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1826 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1827 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1828 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1829 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1830 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1831 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1832 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1835 Version 1.43.1 (2020-05-07)
1836 ===========================
1838 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1839 * [Fixed the stabilization of AVX-512 features.][71473]
1840 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1842 [71430]: https://github.com/rust-lang/rust/pull/71430
1843 [71473]: https://github.com/rust-lang/rust/issues/71473
1844 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1847 Version 1.43.0 (2020-04-23)
1848 ==========================
1852 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1853 the type inferred correctly.][68129]
1854 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1856 **Syntax only changes**
1857 - [Allow `type Foo: Ord` syntactically.][69361]
1858 - [Fuse associated and extern items up to defaultness.][69194]
1859 - [Syntactically allow `self` in all `fn` contexts.][68764]
1860 - [Merge `fn` syntax + cleanup item parsing.][68728]
1861 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1862 For example, you may now write:
1864 macro_rules! mac_trait {
1874 These are still rejected *semantically*, so you will likely receive an error but
1875 these changes can be seen and parsed by macros and
1876 conditional compilation.
1881 - [You can now pass multiple lint flags to rustc to override the previous
1882 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1883 everything in the `unused` lint group except `unused-variables` which
1884 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1885 everything in the `unused` lint group **including** `unused-variables` since
1886 the allow flag is specified before the deny flag (and therefore overridden).
1887 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1888 if they are available on `windows-gnu`.][67429]
1889 - [rustc now buffers errors/warnings printed in JSON.][69227]
1893 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1894 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1895 respectively.][69538] **Note** These conversions are only available when `N`
1897 - [You can now use associated constants on floats and integers directly, rather
1898 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1899 `f32::NAN` with no imports.
1900 - [`u8::is_ascii` is now `const`.][68984]
1901 - [`String` now implements `AsMut<str>`.][68742]
1902 - [Added the `primitive` module to `std` and `core`.][67637] This module
1903 reexports Rust's primitive types. This is mainly useful in macros
1904 where you want avoid these types being shadowed.
1905 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1906 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1910 - [`Once::is_completed`]
1915 - [`iter::once_with`]
1919 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1920 your environment.][cargo/7823]
1921 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1922 executable path when running integration tests or benchmarks.][cargo/7697]
1923 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1924 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1928 - [Certain checks in the `const_err` lint were deemed unrelated to const
1929 evaluation][69185], and have been moved to the `unconditional_panic` and
1930 `arithmetic_overflow` lints.
1935 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1936 has been a warning since 1.36.0.
1937 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1938 led to some instances being accepted, and now correctly emits a hard error.
1940 [69340]: https://github.com/rust-lang/rust/pull/69340
1944 These changes provide no direct user facing benefits, but represent significant
1945 improvements to the internals and overall performance of `rustc` and
1948 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1949 - [Improved how rustc generates drop code.][67332]
1950 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1951 - [traits: preallocate 2 Vecs of known initial size][69022]
1952 - [Avoid exponential behaviour when relating types][68772]
1953 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1954 - [Improve performance of coherence checks][68966]
1955 - [Deduplicate types in the generator witness][68672]
1956 - [Invert control in struct_lint_level.][68725]
1958 [67332]: https://github.com/rust-lang/rust/pull/67332/
1959 [67429]: https://github.com/rust-lang/rust/pull/67429/
1960 [67637]: https://github.com/rust-lang/rust/pull/67637/
1961 [67642]: https://github.com/rust-lang/rust/pull/67642/
1962 [67878]: https://github.com/rust-lang/rust/pull/67878/
1963 [67885]: https://github.com/rust-lang/rust/pull/67885/
1964 [68129]: https://github.com/rust-lang/rust/pull/68129/
1965 [68672]: https://github.com/rust-lang/rust/pull/68672/
1966 [68725]: https://github.com/rust-lang/rust/pull/68725/
1967 [68728]: https://github.com/rust-lang/rust/pull/68728/
1968 [68738]: https://github.com/rust-lang/rust/pull/68738/
1969 [68742]: https://github.com/rust-lang/rust/pull/68742/
1970 [68764]: https://github.com/rust-lang/rust/pull/68764/
1971 [68772]: https://github.com/rust-lang/rust/pull/68772/
1972 [68943]: https://github.com/rust-lang/rust/pull/68943/
1973 [68952]: https://github.com/rust-lang/rust/pull/68952/
1974 [68966]: https://github.com/rust-lang/rust/pull/68966/
1975 [68984]: https://github.com/rust-lang/rust/pull/68984/
1976 [69022]: https://github.com/rust-lang/rust/pull/69022/
1977 [69185]: https://github.com/rust-lang/rust/pull/69185/
1978 [69194]: https://github.com/rust-lang/rust/pull/69194/
1979 [69201]: https://github.com/rust-lang/rust/pull/69201/
1980 [69227]: https://github.com/rust-lang/rust/pull/69227/
1981 [69548]: https://github.com/rust-lang/rust/pull/69548/
1982 [69256]: https://github.com/rust-lang/rust/pull/69256/
1983 [69361]: https://github.com/rust-lang/rust/pull/69361/
1984 [69366]: https://github.com/rust-lang/rust/pull/69366/
1985 [69538]: https://github.com/rust-lang/rust/pull/69538/
1986 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1987 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1988 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1989 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1990 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1991 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1992 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1993 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1996 Version 1.42.0 (2020-03-12)
1997 ==========================
2001 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2003 fn foo(words: &[&str]) {
2005 ["Hello", "World", "!", ..] => println!("Hello World!"),
2006 ["Foo", "Bar", ..] => println!("Baz"),
2007 rest => println!("{:?}", rest),
2011 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2012 that you can create an enum that has the exact layout and ABI of the type
2014 - [You can now use outer attribute procedural macros on inline modules.][64273]
2015 - [There are some *syntax-only* changes:][67131]
2016 - `default` is syntactically allowed before items in `trait` definitions.
2017 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2018 leave out their bodies in favor of `;`.
2019 - Bounds on associated types in `impl`s are now syntactically allowed
2020 (e.g. `type Foo: Ord;`).
2021 - `...` (the C-variadic type) may occur syntactically directly as the type of
2022 any function parameter.
2024 These are still rejected *semantically*, so you will likely receive an error
2025 but these changes can be seen and parsed by procedural macros and
2026 conditional compilation.
2030 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2031 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2032 - [`Option::{expect,unwrap}` and
2033 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2034 pointing to the location where they were called, rather than
2035 `core`'s internals. ][67887]
2037 \* Refer to Rust's [platform support page][platform-support-doc] for more
2038 information on Rust's tiered platform support.
2042 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2043 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2044 to implement `Sized`.][67935]
2045 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2046 - [`Layout::new` is now `const`.][66254]
2047 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2052 - [`CondVar::wait_while`]
2053 - [`CondVar::wait_timeout_while`]
2055 - [`DebugMap::value`]
2056 - [`ManuallyDrop::take`]
2058 - [`ptr::slice_from_raw_parts_mut`]
2059 - [`ptr::slice_from_raw_parts`]
2063 - [You no longer need to include `extern crate proc_macro;` to be able to
2064 `use proc_macro;` in the `2018` edition.][cargo/7700]
2068 - [`Error::description` has been deprecated, and its use will now produce a
2069 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2071 [68253]: https://github.com/rust-lang/rust/pull/68253/
2072 [68348]: https://github.com/rust-lang/rust/pull/68348/
2073 [67935]: https://github.com/rust-lang/rust/pull/67935/
2074 [68339]: https://github.com/rust-lang/rust/pull/68339/
2075 [68122]: https://github.com/rust-lang/rust/pull/68122/
2076 [64273]: https://github.com/rust-lang/rust/pull/64273/
2077 [67712]: https://github.com/rust-lang/rust/pull/67712/
2078 [67887]: https://github.com/rust-lang/rust/pull/67887/
2079 [67131]: https://github.com/rust-lang/rust/pull/67131/
2080 [67233]: https://github.com/rust-lang/rust/pull/67233/
2081 [66899]: https://github.com/rust-lang/rust/pull/66899/
2082 [66919]: https://github.com/rust-lang/rust/pull/66919/
2083 [66254]: https://github.com/rust-lang/rust/pull/66254/
2084 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2085 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2086 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2087 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2088 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2089 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2090 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2091 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2092 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2095 Version 1.41.1 (2020-02-27)
2096 ===========================
2098 * [Always check types of static items][69145]
2099 * [Always check lifetime bounds of `Copy` impls][69145]
2100 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2102 [69225]: https://github.com/rust-lang/rust/issues/69225
2103 [69145]: https://github.com/rust-lang/rust/pull/69145
2106 Version 1.41.0 (2020-01-30)
2107 ===========================
2112 - [You can now pass type parameters to foreign items when implementing
2113 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2114 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2115 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2116 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2117 - [You can now use any valid identifier in a `format_args` macro.][66847]
2118 Previously identifiers starting with an underscore were not allowed.
2119 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2120 enum variants.][66183] These are still rejected semantically, but
2121 can be seen and parsed by procedural macros and conditional compilation.
2126 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2127 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2128 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2129 - [You can now pass an arguments file passing the `@path` syntax
2130 to rustc.][66172] Note that the format differs somewhat from what is
2131 found in other tooling; please see [the documentation][argfile-docs] for
2133 - [You can now provide `--extern` flag without a path, indicating that it is
2134 available from the search path or specified with an `-L` flag.][64882]
2136 \* Refer to Rust's [platform support page][platform-support-doc] for more
2137 information on Rust's tiered platform support.
2139 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2144 - [The `core::panic` module is now stable.][66771] It was already stable
2146 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2147 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2148 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2153 - [`Result::map_or`]
2154 - [`Result::map_or_else`]
2155 - [`std::rc::Weak::weak_count`]
2156 - [`std::rc::Weak::strong_count`]
2157 - [`std::sync::Weak::weak_count`]
2158 - [`std::sync::Weak::strong_count`]
2163 - [Cargo will now document all the private items for binary crates
2164 by default.][cargo/7593]
2165 - [`cargo-install` will now reinstall the package if it detects that it is out
2166 of date.][cargo/7560]
2167 - [Cargo.lock now uses a more git friendly format that should help to reduce
2168 merge conflicts.][cargo/7579]
2169 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2170 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2171 optimisation level to `2` for debug builds. You can also use
2172 `[profile.<profile>.build-override]` to override build scripts and
2178 - [You can now specify `edition` in documentation code blocks to compile the block
2179 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2180 should be compiled the 2018 edition of Rust.
2181 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2182 current theme with `--check-theme`.][54733]
2183 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2188 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2189 Apple targets.][apple-32bit-drop] This means that the source code is still
2190 available to build, but the targets are no longer being tested and release
2191 binaries for those platforms will no longer be distributed by the Rust project.
2192 Please refer to the linked blog post for more information.
2194 [54733]: https://github.com/rust-lang/rust/pull/54733/
2195 [61351]: https://github.com/rust-lang/rust/pull/61351/
2196 [67255]: https://github.com/rust-lang/rust/pull/67255/
2197 [66661]: https://github.com/rust-lang/rust/pull/66661/
2198 [66771]: https://github.com/rust-lang/rust/pull/66771/
2199 [66847]: https://github.com/rust-lang/rust/pull/66847/
2200 [66238]: https://github.com/rust-lang/rust/pull/66238/
2201 [66277]: https://github.com/rust-lang/rust/pull/66277/
2202 [66325]: https://github.com/rust-lang/rust/pull/66325/
2203 [66172]: https://github.com/rust-lang/rust/pull/66172/
2204 [66183]: https://github.com/rust-lang/rust/pull/66183/
2205 [65879]: https://github.com/rust-lang/rust/pull/65879/
2206 [65013]: https://github.com/rust-lang/rust/pull/65013/
2207 [64882]: https://github.com/rust-lang/rust/pull/64882/
2208 [64325]: https://github.com/rust-lang/rust/pull/64325/
2209 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2210 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2211 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2212 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2213 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2214 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2215 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2216 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2217 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2218 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2219 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2221 Version 1.40.0 (2019-12-19)
2222 ===========================
2226 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2227 `const` contexts.][65188] e.g.
2230 pub struct Point(i32, i32);
2232 const ORIGIN: Point = {
2233 let constructor = Point;
2239 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2240 indicate that there may be variants or fields added in the future.][64639]
2241 For example this requires adding a wild-card branch (`_ => {}`) to any match
2242 statements on a non-exhaustive `enum`. [(RFC 2008)]
2243 - [You can now use function-like procedural macros in `extern` blocks and in
2244 type positions.][63931] e.g. `type Generated = macro!();`
2245 - [Function-like and attribute procedural macros can now emit
2246 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2247 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2248 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2249 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2253 - [Added tier 3 support\* for the
2254 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2255 - [Added tier 3 support for the
2256 `aarch64-unknown-none-softfloat` target.][64589]
2257 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2258 `mips64el-unknown-linux-muslabi64` targets.][65843]
2260 \* Refer to Rust's [platform support page][platform-support-doc] for more
2261 information on Rust's tiered platform support.
2265 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2269 - [`BTreeMap::get_key_value`]
2270 - [`HashMap::get_key_value`]
2271 - [`Option::as_deref_mut`]
2272 - [`Option::as_deref`]
2273 - [`Option::flatten`]
2274 - [`UdpSocket::peer_addr`]
2275 - [`f32::to_be_bytes`]
2276 - [`f32::to_le_bytes`]
2277 - [`f32::to_ne_bytes`]
2278 - [`f64::to_be_bytes`]
2279 - [`f64::to_le_bytes`]
2280 - [`f64::to_ne_bytes`]
2281 - [`f32::from_be_bytes`]
2282 - [`f32::from_le_bytes`]
2283 - [`f32::from_ne_bytes`]
2284 - [`f64::from_be_bytes`]
2285 - [`f64::from_le_bytes`]
2286 - [`f64::from_ne_bytes`]
2293 - [Cargo will now always display warnings, rather than only on
2294 fresh builds.][cargo/7450]
2295 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2296 now produce an error.][cargo/7507] Previously these flags were ignored.
2297 - [You can now publish `dev-dependencies` without including
2298 a `version`.][cargo/7333]
2302 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2303 when running documentation tests with `rustdoc`.][63803]
2307 - [As previously announced, any previous NLL warnings in the 2015 edition are
2308 now hard errors.][64221]
2309 - [The `include!` macro will now warn if it failed to include the
2310 entire file.][64284] The `include!` macro unintentionally only includes the
2311 first _expression_ in a file, and this can be unintuitive. This will become
2312 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2313 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2314 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2315 or `extern` blocks now correctly emits a hard error.
2317 [65294]: https://github.com/rust-lang/rust/pull/65294/
2318 [66103]: https://github.com/rust-lang/rust/pull/66103/
2319 [65843]: https://github.com/rust-lang/rust/pull/65843/
2320 [65188]: https://github.com/rust-lang/rust/pull/65188/
2321 [65092]: https://github.com/rust-lang/rust/pull/65092/
2322 [64589]: https://github.com/rust-lang/rust/pull/64589/
2323 [64639]: https://github.com/rust-lang/rust/pull/64639/
2324 [64221]: https://github.com/rust-lang/rust/pull/64221/
2325 [64284]: https://github.com/rust-lang/rust/pull/64284/
2326 [63931]: https://github.com/rust-lang/rust/pull/63931/
2327 [64035]: https://github.com/rust-lang/rust/pull/64035/
2328 [63674]: https://github.com/rust-lang/rust/pull/63674/
2329 [63803]: https://github.com/rust-lang/rust/pull/63803/
2330 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2331 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2332 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2333 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2334 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2335 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2336 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2337 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2338 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2339 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2340 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2341 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2342 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2343 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2344 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2345 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2346 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2347 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2348 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2349 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2350 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2351 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2352 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2353 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2354 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2355 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2358 Version 1.39.0 (2019-11-07)
2359 ===========================
2363 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2364 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2365 - [You can now use certain attributes on function, closure, and function pointer
2366 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2367 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2368 attributes applied to items. e.g.
2371 #[cfg(windows)] slice: &[u16],
2372 #[cfg(not(windows))] slice: &[u8],
2377 - [You can now take shared references to bind-by-move patterns in the `if` guards
2378 of `match` arms.][63118] e.g.
2381 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2385 // ---- `nums` is bound by move.
2386 if nums.iter().sum::<u8>() == 10
2387 // ^------ `.iter()` implicitly takes a reference to `nums`.
2390 // ----------- Legal as `nums` was bound by move and so we have ownership.
2392 _ => unreachable!(),
2401 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2402 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2403 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2404 **Note** Cargo currently doesn't use this feature. Refer to
2405 [cargo#7315][cargo/7315] to track this feature's progress.
2406 - [You can now pass `--show-output` argument to test binaries to print the
2407 output of successful tests.][62600]
2410 \* Refer to Rust's [platform support page][platform-support-doc] for more
2411 information on Rust's tiered platform support.
2415 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2416 - [`LinkedList::new` is now a `const` function.][63684]
2417 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2418 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2419 now `const`.][63786]
2423 - [`Pin::into_inner`]
2424 - [`Instant::checked_duration_since`]
2425 - [`Instant::saturating_duration_since`]
2429 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2430 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2431 `--all` is now deprecated.
2435 - [You can now pass `-Clinker` to rustdoc to control the linker used
2436 for compiling doctests.][63834]
2440 - [Code that was previously accepted by the old borrow checker, but rejected by
2441 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2442 previously a warning, and will also become a hard error in the Rust 2015
2443 edition in the 1.40.0 release.
2444 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2445 run tests.][63827] This should improve performance when running a large
2447 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2448 recommended to use the `?` operator instead.
2449 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2452 [62600]: https://github.com/rust-lang/rust/pull/62600/
2453 [62672]: https://github.com/rust-lang/rust/pull/62672/
2454 [63118]: https://github.com/rust-lang/rust/pull/63118/
2455 [63209]: https://github.com/rust-lang/rust/pull/63209/
2456 [63402]: https://github.com/rust-lang/rust/pull/63402/
2457 [63565]: https://github.com/rust-lang/rust/pull/63565/
2458 [63595]: https://github.com/rust-lang/rust/pull/63595/
2459 [63684]: https://github.com/rust-lang/rust/pull/63684/
2460 [63698]: https://github.com/rust-lang/rust/pull/63698/
2461 [63770]: https://github.com/rust-lang/rust/pull/63770/
2462 [63786]: https://github.com/rust-lang/rust/pull/63786/
2463 [63827]: https://github.com/rust-lang/rust/pull/63827/
2464 [63834]: https://github.com/rust-lang/rust/pull/63834/
2465 [63927]: https://github.com/rust-lang/rust/pull/63927/
2466 [63933]: https://github.com/rust-lang/rust/pull/63933/
2467 [63934]: https://github.com/rust-lang/rust/pull/63934/
2468 [63938]: https://github.com/rust-lang/rust/pull/63938/
2469 [63940]: https://github.com/rust-lang/rust/pull/63940/
2470 [63941]: https://github.com/rust-lang/rust/pull/63941/
2471 [63945]: https://github.com/rust-lang/rust/pull/63945/
2472 [64010]: https://github.com/rust-lang/rust/pull/64010/
2473 [64028]: https://github.com/rust-lang/rust/pull/64028/
2474 [64334]: https://github.com/rust-lang/rust/pull/64334/
2475 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2476 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2477 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2478 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2479 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2480 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2482 Version 1.38.0 (2019-09-26)
2483 ==========================
2487 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2488 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2492 - [Added pipelined compilation support to `rustc`.][62766] This will
2493 improve compilation times in some cases. For further information please refer
2494 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2495 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2496 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2497 `x86_64-uwp-windows-msvc` targets.][60260]
2498 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2499 `armv7-unknown-linux-musleabi` targets.][63107]
2500 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2501 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2502 - [Upgraded to LLVM 9.][62592]
2504 \* Refer to Rust's [platform support page][platform-support-doc] for more
2505 information on Rust's tiered platform support.
2509 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2510 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2511 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2512 is available at `std::clone::Clone`). This also makes all built-in macros
2513 available in `std`/`core` root. e.g. `std::include_bytes!`.
2514 - [`str::Chars` now implements `Debug`.][63000]
2515 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2516 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2517 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2518 - [Added euclidean remainder and division operations (`div_euclid`,
2519 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2520 `overflowing`, and `wrapping` versions are available for all
2522 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2523 `PartialEq`.][61491]
2524 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2528 - [`<*const T>::cast`]
2529 - [`<*mut T>::cast`]
2530 - [`Duration::as_secs_f32`]
2531 - [`Duration::as_secs_f64`]
2532 - [`Duration::div_f32`]
2533 - [`Duration::div_f64`]
2534 - [`Duration::from_secs_f32`]
2535 - [`Duration::from_secs_f64`]
2536 - [`Duration::mul_f32`]
2537 - [`Duration::mul_f64`]
2538 - [`any::type_name`]
2542 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2543 - [You can now pass the `--features` option multiple times to enable
2544 multiple features.][cargo/7084]
2549 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2553 - [`rustc` will now warn about some incorrect uses of
2554 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2558 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2560 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2561 issues][62896] with certain crates such as libc.
2563 [60260]: https://github.com/rust-lang/rust/pull/60260/
2564 [61457]: https://github.com/rust-lang/rust/pull/61457/
2565 [61491]: https://github.com/rust-lang/rust/pull/61491/
2566 [61884]: https://github.com/rust-lang/rust/pull/61884/
2567 [61953]: https://github.com/rust-lang/rust/pull/61953/
2568 [62042]: https://github.com/rust-lang/rust/pull/62042/
2569 [62528]: https://github.com/rust-lang/rust/pull/62528/
2570 [62583]: https://github.com/rust-lang/rust/pull/62583/
2571 [62735]: https://github.com/rust-lang/rust/pull/62735/
2572 [62766]: https://github.com/rust-lang/rust/pull/62766/
2573 [62784]: https://github.com/rust-lang/rust/pull/62784/
2574 [62592]: https://github.com/rust-lang/rust/pull/62592/
2575 [62785]: https://github.com/rust-lang/rust/issues/62785/
2576 [62814]: https://github.com/rust-lang/rust/pull/62814/
2577 [62896]: https://github.com/rust-lang/rust/issues/62896/
2578 [63000]: https://github.com/rust-lang/rust/pull/63000/
2579 [63056]: https://github.com/rust-lang/rust/pull/63056/
2580 [63107]: https://github.com/rust-lang/rust/pull/63107/
2581 [63346]: https://github.com/rust-lang/rust/pull/63346/
2582 [63421]: https://github.com/rust-lang/rust/pull/63421/
2583 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2584 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2585 [63048]: https://github.com/rust-lang/rust/pull/63048
2586 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2587 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2588 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2589 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2590 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2591 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2592 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2593 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2594 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2595 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2596 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2597 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2598 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2600 Version 1.37.0 (2019-08-15)
2601 ==========================
2605 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2606 [`Box`][62228], or an [array][62235] and unused.
2607 - [You can now use the `cfg` and `cfg_attr` attributes on
2608 generic parameters.][61547]
2609 - [You can now use enum variants through type alias.][61682] e.g. You can
2610 write the following:
2612 type MyOption = Option<u8>;
2614 fn increment_or_zero(x: MyOption) -> u8 {
2616 MyOption::Some(y) => y + 1,
2617 MyOption::None => 0,
2621 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2622 `const _: u32 = 5;`.
2623 - [You can now use `#[repr(align(X)]` on enums.][61229]
2624 - [The `?` Kleene macro operator is now available in the
2625 2015 edition.][60932]
2629 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2630 and `-C profile-use` flags.][61268] For more information on how to use profile
2631 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2632 - [The `rust-lldb` wrapper script should now work again.][61827]
2636 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2640 - [`BufReader::buffer`]
2641 - [`BufWriter::buffer`]
2642 - [`Cell::from_mut`]
2643 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2644 - [`DoubleEndedIterator::nth_back`]
2646 - [`Wrapping::reverse_bits`]
2647 - [`i128::reverse_bits`]
2648 - [`i16::reverse_bits`]
2649 - [`i32::reverse_bits`]
2650 - [`i64::reverse_bits`]
2651 - [`i8::reverse_bits`]
2652 - [`isize::reverse_bits`]
2653 - [`slice::copy_within`]
2654 - [`u128::reverse_bits`]
2655 - [`u16::reverse_bits`]
2656 - [`u32::reverse_bits`]
2657 - [`u64::reverse_bits`]
2658 - [`u8::reverse_bits`]
2659 - [`usize::reverse_bits`]
2663 - [`Cargo.lock` files are now included by default when publishing executable crates
2664 with executables.][cargo/7026]
2665 - [You can now specify `default-run="foo"` in `[package]` to specify the
2666 default executable to use for `cargo run`.][cargo/7056]
2673 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2674 Please transition your code to using the `..=` syntax for inclusive
2676 - [Using a trait object without the `dyn` will now warn by default.][61203]
2677 Please transition your code to use `dyn Trait` for trait objects instead.
2679 [62228]: https://github.com/rust-lang/rust/pull/62228/
2680 [62235]: https://github.com/rust-lang/rust/pull/62235/
2681 [61802]: https://github.com/rust-lang/rust/pull/61802/
2682 [61827]: https://github.com/rust-lang/rust/pull/61827/
2683 [61547]: https://github.com/rust-lang/rust/pull/61547/
2684 [61682]: https://github.com/rust-lang/rust/pull/61682/
2685 [61268]: https://github.com/rust-lang/rust/pull/61268/
2686 [61342]: https://github.com/rust-lang/rust/pull/61342/
2687 [61347]: https://github.com/rust-lang/rust/pull/61347/
2688 [61100]: https://github.com/rust-lang/rust/pull/61100/
2689 [61203]: https://github.com/rust-lang/rust/pull/61203/
2690 [61229]: https://github.com/rust-lang/rust/pull/61229/
2691 [60932]: https://github.com/rust-lang/rust/pull/60932/
2692 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2693 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2694 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2695 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2696 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2697 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2698 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2699 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2700 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2701 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2702 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2703 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2704 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2705 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2706 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2707 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2708 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2709 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2710 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2711 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2712 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2713 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2714 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2715 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2718 Version 1.36.0 (2019-07-04)
2719 ==========================
2723 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2724 - [The order of traits in trait objects no longer affects the semantics of that
2725 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2726 `dyn fmt::Debug + Send`, where this was previously not the case.
2730 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2731 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2732 - [`mem::needs_drop` is now available as a const fn.][60364]
2733 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2734 - [`String` now implements `BorrowMut<str>`.][60404]
2735 - [`io::Cursor` now implements `Default`.][60234]
2736 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2737 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2738 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2739 environment has access to heap memory allocation.
2740 - [`String` now implements `From<&String>`.][59825]
2741 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2742 return a tuple of each argument when there is multiple arguments.
2743 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2748 - [`VecDeque::rotate_left`]
2749 - [`VecDeque::rotate_right`]
2750 - [`Iterator::copied`]
2752 - [`io::IoSliceMut`]
2753 - [`Read::read_vectored`]
2754 - [`Write::write_vectored`]
2755 - [`str::as_mut_ptr`]
2756 - [`mem::MaybeUninit`]
2757 - [`pointer::align_offset`]
2758 - [`future::Future`]
2760 - [`task::RawWaker`]
2761 - [`task::RawWakerVTable`]
2767 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2768 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2770 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2774 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2781 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2782 longer recommended, and will be deprecated in 1.39.0.
2784 [60318]: https://github.com/rust-lang/rust/pull/60318/
2785 [60364]: https://github.com/rust-lang/rust/pull/60364/
2786 [60370]: https://github.com/rust-lang/rust/pull/60370/
2787 [60404]: https://github.com/rust-lang/rust/pull/60404/
2788 [60234]: https://github.com/rust-lang/rust/pull/60234/
2789 [60244]: https://github.com/rust-lang/rust/pull/60244/
2790 [58623]: https://github.com/rust-lang/rust/pull/58623/
2791 [59648]: https://github.com/rust-lang/rust/pull/59648/
2792 [59675]: https://github.com/rust-lang/rust/pull/59675/
2793 [59825]: https://github.com/rust-lang/rust/pull/59825/
2794 [59826]: https://github.com/rust-lang/rust/pull/59826/
2795 [59445]: https://github.com/rust-lang/rust/pull/59445/
2796 [59114]: https://github.com/rust-lang/rust/pull/59114/
2797 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2798 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2799 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2800 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2801 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2802 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2803 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2804 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2805 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2806 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2807 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2808 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2809 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2810 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2811 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2812 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2813 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2814 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2815 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2816 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2819 Version 1.35.0 (2019-05-23)
2820 ==========================
2824 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2825 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2826 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2828 unsafe fn call_unsafe(func: unsafe fn()) {
2833 unsafe { call_unsafe(|| {}); }
2840 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2841 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2842 - [Added the `wasm32-unknown-wasi` target.][59464]
2847 - [`Thread` will now show its ID in `Debug` output.][59460]
2848 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2849 - [`alloc::System` now implements `Default`.][59451]
2850 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2852 - [`char::{ToLowercase, ToUppercase}` now
2853 implement `ExactSizeIterator`.][58778]
2854 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2855 - [Removed the `Read` trait bounds
2856 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2857 - [You can now call the `dbg!` macro without any parameters to print the file
2858 and line where it is called.][57847]
2859 - [In place ASCII case conversions are now up to 4× faster.][59283]
2860 e.g. `str::make_ascii_lowercase`
2861 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2868 - [`RefCell::replace_with`]
2869 - [`RefCell::map_split`]
2871 - [`Range::contains`]
2872 - [`RangeFrom::contains`]
2873 - [`RangeTo::contains`]
2874 - [`RangeInclusive::contains`]
2875 - [`RangeToInclusive::contains`]
2876 - [`Option::copied`]
2880 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2881 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2886 - [The Rust toolchain is now available natively for musl based distros.][58575]
2888 [59460]: https://github.com/rust-lang/rust/pull/59460/
2889 [59464]: https://github.com/rust-lang/rust/pull/59464/
2890 [59500]: https://github.com/rust-lang/rust/pull/59500/
2891 [59512]: https://github.com/rust-lang/rust/pull/59512/
2892 [59580]: https://github.com/rust-lang/rust/pull/59580/
2893 [59283]: https://github.com/rust-lang/rust/pull/59283/
2894 [59451]: https://github.com/rust-lang/rust/pull/59451/
2895 [59076]: https://github.com/rust-lang/rust/pull/59076/
2896 [58778]: https://github.com/rust-lang/rust/pull/58778/
2897 [58717]: https://github.com/rust-lang/rust/pull/58717/
2898 [58369]: https://github.com/rust-lang/rust/pull/58369/
2899 [58423]: https://github.com/rust-lang/rust/pull/58423/
2900 [58080]: https://github.com/rust-lang/rust/pull/58080/
2901 [57847]: https://github.com/rust-lang/rust/pull/57847/
2902 [58575]: https://github.com/rust-lang/rust/pull/58575
2903 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2904 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2905 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2906 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2907 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2908 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2909 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2910 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2911 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2912 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2913 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2914 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2916 Version 1.34.2 (2019-05-14)
2917 ===========================
2919 * [Destabilize the `Error::type_id` function due to a security
2920 vulnerability][60785] ([CVE-2019-12083])
2922 [60785]: https://github.com/rust-lang/rust/pull/60785
2923 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2925 Version 1.34.1 (2019-04-25)
2926 ===========================
2928 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2929 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2930 * [Fix Clippy panic when checking some macros][clippy/3805]
2932 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2933 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2934 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2936 Version 1.34.0 (2019-04-11)
2937 ==========================
2941 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2942 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2944 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2945 `#[attr{}]` procedural macros.][57367]
2946 - [You can now write `extern crate self as foo;`][57407] to import your
2947 crate's root into the extern prelude.
2952 - [You can now target `riscv64imac-unknown-none-elf` and
2953 `riscv64gc-unknown-none-elf`.][58406]
2954 - [You can now enable linker plugin LTO optimisations with
2955 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2956 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2958 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2963 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2964 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2965 the `Hash` trait to create an iterator.
2966 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2967 methods.][58421] Most notably you no longer require the `Ord` trait to create
2969 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2970 for all numeric types.][58044]
2971 - [Indexing a `str` is now generic over all types that
2972 implement `SliceIndex<str>`.][57604]
2973 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2974 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2975 produce a warning if their returning type is unused.
2976 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2977 `overflowing_pow` are now available for all numeric types.][57873] These are
2978 equivalent to methods such as `wrapping_add` for the `pow` operation.
2986 * [`Error::type_id`]
2987 * [`atomic::AtomicI16`]
2988 * [`atomic::AtomicI32`]
2989 * [`atomic::AtomicI64`]
2990 * [`atomic::AtomicI8`]
2991 * [`atomic::AtomicU16`]
2992 * [`atomic::AtomicU32`]
2993 * [`atomic::AtomicU64`]
2994 * [`atomic::AtomicU8`]
2995 * [`convert::Infallible`]
2996 * [`convert::TryFrom`]
2997 * [`convert::TryInto`]
2999 * [`iter::successors`]
3000 * [`num::NonZeroI128`]
3001 * [`num::NonZeroI16`]
3002 * [`num::NonZeroI32`]
3003 * [`num::NonZeroI64`]
3004 * [`num::NonZeroI8`]
3005 * [`num::NonZeroIsize`]
3006 * [`slice::sort_by_cached_key`]
3007 * [`str::escape_debug`]
3008 * [`str::escape_default`]
3009 * [`str::escape_unicode`]
3010 * [`str::split_ascii_whitespace`]
3013 * [`Instant::checked_add`]
3014 * [`Instant::checked_sub`]
3015 * [`SystemTime::checked_add`]
3016 * [`SystemTime::checked_sub`]
3020 - [You can now use alternative registries to crates.io.][cargo/6654]
3024 - [You can now use the `?` operator in your documentation tests without manually
3025 adding `fn main() -> Result<(), _> {}`.][56470]
3029 - [`Command::before_exec` is being replaced by the unsafe method
3030 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3031 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3032 can now use `const` functions in `static` variables.
3034 [58370]: https://github.com/rust-lang/rust/pull/58370/
3035 [58406]: https://github.com/rust-lang/rust/pull/58406/
3036 [58421]: https://github.com/rust-lang/rust/pull/58421/
3037 [58166]: https://github.com/rust-lang/rust/pull/58166/
3038 [58044]: https://github.com/rust-lang/rust/pull/58044/
3039 [58057]: https://github.com/rust-lang/rust/pull/58057/
3040 [58059]: https://github.com/rust-lang/rust/pull/58059/
3041 [57809]: https://github.com/rust-lang/rust/pull/57809/
3042 [57873]: https://github.com/rust-lang/rust/pull/57873/
3043 [57604]: https://github.com/rust-lang/rust/pull/57604/
3044 [57367]: https://github.com/rust-lang/rust/pull/57367/
3045 [57407]: https://github.com/rust-lang/rust/pull/57407/
3046 [57425]: https://github.com/rust-lang/rust/pull/57425/
3047 [57106]: https://github.com/rust-lang/rust/pull/57106/
3048 [56470]: https://github.com/rust-lang/rust/pull/56470/
3049 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3050 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3051 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3052 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3053 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3054 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3055 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3056 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3057 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3058 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3059 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3060 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3061 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3062 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3063 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3064 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3065 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3066 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3067 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3068 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3069 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3070 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3071 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3072 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3073 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3074 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3075 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3076 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3077 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3078 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3079 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3082 Version 1.33.0 (2019-02-28)
3083 ==========================
3087 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3088 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3089 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3090 E.g. You can have match statement on a `u8` that covers `0..=255` and
3091 you would no longer be required to have a `_ => unreachable!()` case.
3092 - [You can now have multiple patterns in `if let` and `while let`
3093 expressions.][57532] You can do this with the same syntax as a `match`
3103 let state = Creature::Crab("Ferris");
3105 if let Creature::Crab(name) | Creature::Person(name) = state {
3106 println!("This creature's name is: {}", name);
3110 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3111 this feature will by default produce a warning as this behaviour can be
3112 unintuitive. E.g. `if let _ = 5 {}`
3113 - [You can now use `let` bindings, assignments, expression statements,
3114 and irrefutable pattern destructuring in const functions.][57175]
3115 - [You can now call unsafe const functions.][57067] E.g.
3117 const unsafe fn foo() -> i32 { 5 }
3118 const fn bar() -> i32 {
3122 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3123 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3124 - [You can now specify a specific alignment with the `#[repr(packed)]`
3125 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3126 with an alignment of 2 bytes and a size of 6 bytes.
3127 - [You can now import an item from a module as an `_`.][56303] This allows you to
3128 import a trait's impls, and not have the name in the namespace. E.g.
3130 use std::io::Read as _;
3132 // Allowed as there is only one `Read` in the module.
3135 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3139 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3140 command line argument.][56351]
3141 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3142 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3143 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3144 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3145 information on Rust's platform support.
3146 - [Added support for the `thumbv7neon-linux-androideabi` and
3147 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3148 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3152 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3153 functions for all numeric types.][57566]
3154 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3155 are now `const` functions for all numeric types.][57105]
3156 - [The methods `is_positive` and `is_negative` are now `const` functions for
3157 all signed numeric types.][57105]
3158 - [The `get` method for all `NonZero` types is now `const`.][57167]
3159 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3160 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3161 numeric types.][57234]
3162 - [`Ipv4Addr::new` is now a `const` function][57234]
3166 - [`unix::FileExt::read_exact_at`]
3167 - [`unix::FileExt::write_all_at`]
3168 - [`Option::transpose`]
3169 - [`Result::transpose`]
3170 - [`convert::identity`]
3173 - [`marker::PhantomPinned`]
3174 - [`Vec::resize_with`]
3175 - [`VecDeque::resize_with`]
3176 - [`Duration::as_millis`]
3177 - [`Duration::as_micros`]
3178 - [`Duration::as_nanos`]
3183 - [You can now publish crates that require a feature flag to compile with
3184 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3185 - [Cargo should now rebuild a crate if a file was modified during the initial
3190 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3191 are now deprecated in the standard library, and their usage will now produce a warning.
3192 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3194 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3196 - [Libtest no longer creates a new thread for each test when
3197 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3199 [55982]: https://github.com/rust-lang/rust/pull/55982/
3200 [56243]: https://github.com/rust-lang/rust/pull/56243
3201 [56303]: https://github.com/rust-lang/rust/pull/56303/
3202 [56351]: https://github.com/rust-lang/rust/pull/56351/
3203 [56362]: https://github.com/rust-lang/rust/pull/56362
3204 [56642]: https://github.com/rust-lang/rust/pull/56642/
3205 [56769]: https://github.com/rust-lang/rust/pull/56769/
3206 [56805]: https://github.com/rust-lang/rust/pull/56805
3207 [56947]: https://github.com/rust-lang/rust/pull/56947/
3208 [57049]: https://github.com/rust-lang/rust/pull/57049/
3209 [57067]: https://github.com/rust-lang/rust/pull/57067/
3210 [57105]: https://github.com/rust-lang/rust/pull/57105
3211 [57130]: https://github.com/rust-lang/rust/pull/57130/
3212 [57167]: https://github.com/rust-lang/rust/pull/57167/
3213 [57175]: https://github.com/rust-lang/rust/pull/57175/
3214 [57234]: https://github.com/rust-lang/rust/pull/57234/
3215 [57332]: https://github.com/rust-lang/rust/pull/57332/
3216 [57465]: https://github.com/rust-lang/rust/pull/57465/
3217 [57532]: https://github.com/rust-lang/rust/pull/57532/
3218 [57535]: https://github.com/rust-lang/rust/pull/57535/
3219 [57566]: https://github.com/rust-lang/rust/pull/57566/
3220 [57615]: https://github.com/rust-lang/rust/pull/57615/
3221 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3222 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3223 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3224 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3225 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3226 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3227 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3228 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3229 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3230 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3231 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3232 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3233 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3234 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3235 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3236 [platform-support]: https://forge.rust-lang.org/platform-support.html
3238 Version 1.32.0 (2019-01-17)
3239 ==========================
3244 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3245 operator allows you to specify zero or one repetitions similar to the `*` and
3247 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3248 now always resolve to the item (`enum`, `struct`, etc.) available in the
3249 module if present, before resolving to a external crate or an item the prelude.][56759]
3252 enum Color { Red, Green, Blue }
3258 - [You can now match against `PhantomData<T>` types.][55837]
3259 - [You can now match against literals in macros with the `literal`
3260 specifier.][56072] This will match against a literal of any type.
3261 E.g. `1`, `'A'`, `"Hello World"`
3262 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3264 struct Point(i32, i32);
3267 pub fn new(x: i32, y: i32) -> Self {
3271 pub fn is_origin(&self) -> bool {
3279 - [Self can also now be used in type definitions.][56366] E.g.
3283 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3286 Cons(T, Box<Self>) // likewise here
3289 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3290 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3294 - [The default allocator has changed from jemalloc to the default allocator on
3295 your system.][55238] The compiler itself on Linux & macOS will still use
3296 jemalloc, but programs compiled with it will use the system allocator.
3297 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3301 - [`PathBuf` now implements `FromStr`.][55148]
3302 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3303 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3304 easily debug expressions in your rust program. E.g.
3307 let b = dbg!(a * 2) + 1;
3308 // ^-- prints: [src/main.rs:4] a * 2 = 4
3312 The following APIs are now `const` functions and can be used in a
3316 - [`UnsafeCell::get`]
3317 - [`char::is_ascii`]
3319 - [`ManuallyDrop::new`]
3320 - [`ManuallyDrop::into_inner`]
3321 - [`RangeInclusive::start`]
3322 - [`RangeInclusive::end`]
3323 - [`NonNull::as_ptr`]
3326 - [`Duration::as_secs`]
3327 - [`Duration::subsec_millis`]
3328 - [`Duration::subsec_micros`]
3329 - [`Duration::subsec_nanos`]
3331 - [`Ipv4Addr::is_unspecified`]
3333 - [`Ipv6Addr::octets`]
3337 - [`i8::to_be_bytes`]
3338 - [`i8::to_le_bytes`]
3339 - [`i8::to_ne_bytes`]
3340 - [`i8::from_be_bytes`]
3341 - [`i8::from_le_bytes`]
3342 - [`i8::from_ne_bytes`]
3343 - [`i16::to_be_bytes`]
3344 - [`i16::to_le_bytes`]
3345 - [`i16::to_ne_bytes`]
3346 - [`i16::from_be_bytes`]
3347 - [`i16::from_le_bytes`]
3348 - [`i16::from_ne_bytes`]
3349 - [`i32::to_be_bytes`]
3350 - [`i32::to_le_bytes`]
3351 - [`i32::to_ne_bytes`]
3352 - [`i32::from_be_bytes`]
3353 - [`i32::from_le_bytes`]
3354 - [`i32::from_ne_bytes`]
3355 - [`i64::to_be_bytes`]
3356 - [`i64::to_le_bytes`]
3357 - [`i64::to_ne_bytes`]
3358 - [`i64::from_be_bytes`]
3359 - [`i64::from_le_bytes`]
3360 - [`i64::from_ne_bytes`]
3361 - [`i128::to_be_bytes`]
3362 - [`i128::to_le_bytes`]
3363 - [`i128::to_ne_bytes`]
3364 - [`i128::from_be_bytes`]
3365 - [`i128::from_le_bytes`]
3366 - [`i128::from_ne_bytes`]
3367 - [`isize::to_be_bytes`]
3368 - [`isize::to_le_bytes`]
3369 - [`isize::to_ne_bytes`]
3370 - [`isize::from_be_bytes`]
3371 - [`isize::from_le_bytes`]
3372 - [`isize::from_ne_bytes`]
3373 - [`u8::to_be_bytes`]
3374 - [`u8::to_le_bytes`]
3375 - [`u8::to_ne_bytes`]
3376 - [`u8::from_be_bytes`]
3377 - [`u8::from_le_bytes`]
3378 - [`u8::from_ne_bytes`]
3379 - [`u16::to_be_bytes`]
3380 - [`u16::to_le_bytes`]
3381 - [`u16::to_ne_bytes`]
3382 - [`u16::from_be_bytes`]
3383 - [`u16::from_le_bytes`]
3384 - [`u16::from_ne_bytes`]
3385 - [`u32::to_be_bytes`]
3386 - [`u32::to_le_bytes`]
3387 - [`u32::to_ne_bytes`]
3388 - [`u32::from_be_bytes`]
3389 - [`u32::from_le_bytes`]
3390 - [`u32::from_ne_bytes`]
3391 - [`u64::to_be_bytes`]
3392 - [`u64::to_le_bytes`]
3393 - [`u64::to_ne_bytes`]
3394 - [`u64::from_be_bytes`]
3395 - [`u64::from_le_bytes`]
3396 - [`u64::from_ne_bytes`]
3397 - [`u128::to_be_bytes`]
3398 - [`u128::to_le_bytes`]
3399 - [`u128::to_ne_bytes`]
3400 - [`u128::from_be_bytes`]
3401 - [`u128::from_le_bytes`]
3402 - [`u128::from_ne_bytes`]
3403 - [`usize::to_be_bytes`]
3404 - [`usize::to_le_bytes`]
3405 - [`usize::to_ne_bytes`]
3406 - [`usize::from_be_bytes`]
3407 - [`usize::from_le_bytes`]
3408 - [`usize::from_ne_bytes`]
3412 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3413 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3417 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3421 - [The argument types for AVX's
3422 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3423 been changed from `*const` to `*mut` as the previous implementation
3427 [55148]: https://github.com/rust-lang/rust/pull/55148/
3428 [55238]: https://github.com/rust-lang/rust/pull/55238/
3429 [55280]: https://github.com/rust-lang/rust/pull/55280/
3430 [55610]: https://github.com/rust-lang/rust/pull/55610/
3431 [55663]: https://github.com/rust-lang/rust/pull/55663/
3432 [55702]: https://github.com/rust-lang/rust/pull/55702/
3433 [55837]: https://github.com/rust-lang/rust/pull/55837/
3434 [55843]: https://github.com/rust-lang/rust/pull/55843/
3435 [56072]: https://github.com/rust-lang/rust/pull/56072/
3436 [56245]: https://github.com/rust-lang/rust/pull/56245/
3437 [56365]: https://github.com/rust-lang/rust/pull/56365/
3438 [56366]: https://github.com/rust-lang/rust/pull/56366/
3439 [56395]: https://github.com/rust-lang/rust/pull/56395/
3440 [56759]: https://github.com/rust-lang/rust/pull/56759/
3441 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3442 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3443 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3444 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3445 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3446 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3447 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3448 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3449 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3450 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3451 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3452 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3453 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3454 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3455 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3456 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3457 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3458 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3459 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3460 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3461 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3462 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3463 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3464 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3465 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3466 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3467 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3468 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3469 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3470 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3471 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3472 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3473 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3474 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3475 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3476 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3477 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3478 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3479 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3480 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3481 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3482 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3483 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3484 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3485 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3486 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3487 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3488 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3489 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3490 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3491 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3492 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3493 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3494 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3495 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3496 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3497 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3498 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3499 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3500 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3501 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3502 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3503 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3504 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3505 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3506 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3507 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3508 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3509 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3510 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3511 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3512 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3513 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3514 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3515 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3516 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3517 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3518 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3519 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3520 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3521 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3522 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3523 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3524 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3525 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3526 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3527 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3528 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3529 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3530 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3531 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3532 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3533 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3536 Version 1.31.1 (2018-12-20)
3537 ===========================
3539 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3540 - [Fix broken go-to-definition in RLS][rls/1171]
3541 - [Fix infinite loop on hover in RLS][rls/1170]
3543 [56562]: https://github.com/rust-lang/rust/pull/56562
3544 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3545 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3547 Version 1.31.0 (2018-12-06)
3548 ==========================
3552 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3553 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3554 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3555 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3557 - [You can now define and use `const` functions.][54835] These are currently
3558 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3559 [language reference][const-reference] for what exactly is available.
3560 - [You can now use tool lints, which allow you to scope lints from external
3561 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3562 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3563 a crate, not just in exported functions.][54451]
3564 - [You can now use parentheses in pattern matches.][54497]
3568 - [Updated musl to 1.1.20][54430]
3572 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3573 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3574 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3575 into `Option<&mut T>` using the `From` trait.][53218]
3576 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3581 - [`slice::align_to`]
3582 - [`slice::align_to_mut`]
3583 - [`slice::chunks_exact`]
3584 - [`slice::chunks_exact_mut`]
3585 - [`slice::rchunks`]
3586 - [`slice::rchunks_mut`]
3587 - [`slice::rchunks_exact`]
3588 - [`slice::rchunks_exact_mut`]
3589 - [`Option::replace`]
3593 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3594 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3595 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3597 [52813]: https://github.com/rust-lang/rust/pull/52813/
3598 [53218]: https://github.com/rust-lang/rust/pull/53218/
3599 [53555]: https://github.com/rust-lang/rust/issues/53555/
3600 [54057]: https://github.com/rust-lang/rust/pull/54057/
3601 [54240]: https://github.com/rust-lang/rust/pull/54240/
3602 [54430]: https://github.com/rust-lang/rust/pull/54430/
3603 [54451]: https://github.com/rust-lang/rust/pull/54451/
3604 [54497]: https://github.com/rust-lang/rust/pull/54497/
3605 [54778]: https://github.com/rust-lang/rust/pull/54778/
3606 [54835]: https://github.com/rust-lang/rust/pull/54835/
3607 [54870]: https://github.com/rust-lang/rust/pull/54870/
3608 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3609 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3610 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3611 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3612 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3613 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3614 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3615 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3616 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3617 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3618 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3619 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3620 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3621 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3623 Version 1.30.1 (2018-11-08)
3624 ===========================
3626 - [Fixed overflow ICE in rustdoc][54199]
3627 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3629 [54199]: https://github.com/rust-lang/rust/pull/54199
3630 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3632 Version 1.30.0 (2018-10-25)
3633 ==========================
3637 - [Procedural macros are now available.][52081] These kinds of macros allow for
3638 more powerful code generation. There is a [new chapter available][proc-macros]
3639 in the Rust Programming Language book that goes further in depth.
3640 - [You can now use keywords as identifiers using the raw identifiers
3641 syntax (`r#`),][53236] e.g. `let r#for = true;`
3642 - [Using anonymous parameters in traits is now deprecated with a warning and
3643 will be a hard error in the 2018 edition.][53272]
3644 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3645 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3646 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3647 Previously, using a external crate in a module without a use statement
3648 required `let json = ::serde_json::from_str(foo);` but can now be written
3649 as `let json = serde_json::from_str(foo);`.
3650 - [You can now apply the `#[used]` attribute to static items to prevent the
3651 compiler from optimising them away, even if they appear to be unused,][51363]
3652 e.g. `#[used] static FOO: u32 = 1;`
3653 - [You can now import and reexport macros from other crates with the `use`
3654 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3655 the root module of the crate. If your macro relies on calling other local
3656 macros, it is recommended to export with the
3657 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3659 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3660 using the `vis` specifier.][53370]
3661 - [Non-macro attributes now allow all forms of literals, not just
3662 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3663 write `#[attr(true)]`.
3664 - [You can now specify a function to handle a panic in the Rust runtime with the
3665 `#[panic_handler]` attribute.][51366]
3669 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3670 - [Added the `aarch64-unknown-netbsd` target][53165]
3671 - [Upgraded to LLVM 8.][53611]
3675 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3679 - [`Ipv4Addr::BROADCAST`]
3680 - [`Ipv4Addr::LOCALHOST`]
3681 - [`Ipv4Addr::UNSPECIFIED`]
3682 - [`Ipv6Addr::LOCALHOST`]
3683 - [`Ipv6Addr::UNSPECIFIED`]
3684 - [`Iterator::find_map`]
3686 The following methods are replacement methods for `trim_left`, `trim_right`,
3687 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3689 - [`str::trim_end_matches`]
3691 - [`str::trim_start_matches`]
3692 - [`str::trim_start`]
3696 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3697 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3698 equivalent to calling `rustdoc --error-format=json`.
3699 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3703 - [`rustdoc` allows you to specify what edition to treat your code as with the
3704 `--edition` option.][54057]
3705 - [`rustdoc` now has the `--color` (specify whether to output color) and
3706 `--error-format` (specify error format, e.g. `json`) options.][53003]
3707 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3708 debug symbols.][53774]
3709 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3710 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3712 [50911]: https://github.com/rust-lang/rust/pull/50911/
3713 [51363]: https://github.com/rust-lang/rust/pull/51363/
3714 [51366]: https://github.com/rust-lang/rust/pull/51366/
3715 [52081]: https://github.com/rust-lang/rust/pull/52081/
3716 [53003]: https://github.com/rust-lang/rust/pull/53003/
3717 [53033]: https://github.com/rust-lang/rust/pull/53033/
3718 [53044]: https://github.com/rust-lang/rust/pull/53044/
3719 [53165]: https://github.com/rust-lang/rust/pull/53165/
3720 [53611]: https://github.com/rust-lang/rust/pull/53611/
3721 [53213]: https://github.com/rust-lang/rust/pull/53213/
3722 [53236]: https://github.com/rust-lang/rust/pull/53236/
3723 [53272]: https://github.com/rust-lang/rust/pull/53272/
3724 [53370]: https://github.com/rust-lang/rust/pull/53370/
3725 [53459]: https://github.com/rust-lang/rust/pull/53459/
3726 [53774]: https://github.com/rust-lang/rust/pull/53774/
3727 [53822]: https://github.com/rust-lang/rust/pull/53822/
3728 [54057]: https://github.com/rust-lang/rust/pull/54057/
3729 [54146]: https://github.com/rust-lang/rust/pull/54146/
3730 [54404]: https://github.com/rust-lang/rust/pull/54404/
3731 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3732 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3733 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3734 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3736 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3737 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3738 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3739 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3740 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3741 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3742 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3743 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3744 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3745 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3748 Version 1.29.2 (2018-10-11)
3749 ===========================
3751 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3752 - The `rls-preview` component on the windows-gnu targets has been restored.
3754 [54639]: https://github.com/rust-lang/rust/pull/54639
3757 Version 1.29.1 (2018-09-25)
3758 ===========================
3763 - The standard library's `str::repeat` function contained an out of bounds write
3764 caused by an integer overflow. This has been fixed by deterministically
3765 panicking when an overflow happens.
3767 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3771 Version 1.29.0 (2018-09-13)
3772 ==========================
3776 - [Bumped minimum LLVM version to 5.0.][51899]
3777 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3778 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3779 - [Upgraded to LLVM 7.][51966]
3783 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3784 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3785 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3786 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3788 - [`Cell<T>` now allows `T` to be unsized.][50494]
3789 - [`SocketAddr` is now stable on Redox.][52656]
3794 - [`Iterator::flatten`]
3799 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3800 `--locked` to disable this behavior.
3801 - [`cargo-install` will now allow you to cross compile an install
3802 using `--target`.][cargo/5614]
3803 - [Added the `cargo-fix` subcommand to automatically move project code from
3804 2015 edition to 2018.][cargo/5723]
3805 - [`cargo doc` can now optionally document private types using the
3806 `--document-private-items` flag.][cargo/5543]
3810 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3811 the specified level to that level.][52354] For example `--cap-lints warn`
3812 will demote `deny` and `forbid` lints to `warn`.
3813 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3814 fails and `101` if there is a panic.][52197]
3815 - [A preview of clippy has been made available through rustup.][51122]
3816 You can install the preview with `rustup component add clippy-preview`.
3820 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3821 Use `str::get_unchecked(begin..end)` instead.
3822 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3823 Consider using the `home_dir` function from
3824 https://crates.io/crates/dirs instead.
3825 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3826 - [`cfg` attributes and `--cfg` command line flags are now more
3827 strictly validated.][53893]
3829 [53893]: https://github.com/rust-lang/rust/pull/53893/
3830 [52861]: https://github.com/rust-lang/rust/pull/52861/
3831 [51966]: https://github.com/rust-lang/rust/pull/51966/
3832 [52656]: https://github.com/rust-lang/rust/pull/52656/
3833 [52239]: https://github.com/rust-lang/rust/pull/52239/
3834 [52330]: https://github.com/rust-lang/rust/pull/52330/
3835 [52354]: https://github.com/rust-lang/rust/pull/52354/
3836 [52402]: https://github.com/rust-lang/rust/pull/52402/
3837 [52103]: https://github.com/rust-lang/rust/pull/52103/
3838 [52197]: https://github.com/rust-lang/rust/pull/52197/
3839 [51807]: https://github.com/rust-lang/rust/pull/51807/
3840 [51899]: https://github.com/rust-lang/rust/pull/51899/
3841 [51912]: https://github.com/rust-lang/rust/pull/51912/
3842 [51511]: https://github.com/rust-lang/rust/pull/51511/
3843 [51619]: https://github.com/rust-lang/rust/pull/51619/
3844 [51656]: https://github.com/rust-lang/rust/pull/51656/
3845 [51178]: https://github.com/rust-lang/rust/pull/51178/
3846 [51122]: https://github.com/rust-lang/rust/pull/51122
3847 [50494]: https://github.com/rust-lang/rust/pull/50494/
3848 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3849 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3850 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3851 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3852 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3853 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3854 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3857 Version 1.28.0 (2018-08-02)
3858 ===========================
3862 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3863 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3864 the inner type across Foreign Function Interface (FFI) boundaries.
3865 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3866 and can now be used as identifiers.][51196]
3867 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3868 stable.][51241] This will allow users to specify a global allocator for
3870 - [Unit test functions marked with the `#[test]` attribute can now return
3871 `Result<(), E: Debug>` in addition to `()`.][51298]
3872 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3873 allows macros to easily target lifetimes.
3877 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3878 prioritise making smaller binary sizes. `z` is the same as `s` with the
3879 exception that it does not vectorise loops, which typically results in an even
3881 - [The short error format is now stable.][49546] Specified with
3882 `--error-format=short` this option will provide a more compressed output of
3883 rust error messages.
3884 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3885 - [Reduced the number of allocations in the macro parser.][50855] This can
3886 improve compile times of macro heavy crates on average by 5%.
3890 - [Implemented `Default` for `&mut str`.][51306]
3891 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3892 - [Implemented `Extend` for `()`.][50234]
3893 - [The `Debug` implementation of `time::Duration` should now be more easily
3894 human readable.][50364] Previously a `Duration` of one second would printed as
3895 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3896 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3897 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3898 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3899 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3900 for `PathBuf`.][50170]
3901 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3902 and `Wrapping<i128>`.][50465]
3903 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3904 possible.][51050] This can provide up to a 40% speed increase.
3905 - [Improved error messages when using `format!`.][50610]
3909 - [`Iterator::step_by`]
3910 - [`Path::ancestors`]
3911 - [`SystemTime::UNIX_EPOCH`]
3912 - [`alloc::GlobalAlloc`]
3914 - [`alloc::LayoutErr`]
3917 - [`alloc::alloc_zeroed`]
3918 - [`alloc::dealloc`]
3919 - [`alloc::realloc`]
3920 - [`alloc::handle_alloc_error`]
3921 - [`btree_map::Entry::or_default`]
3922 - [`fmt::Alignment`]
3923 - [`hash_map::Entry::or_default`]
3924 - [`iter::repeat_with`]
3925 - [`num::NonZeroUsize`]
3926 - [`num::NonZeroU128`]
3927 - [`num::NonZeroU16`]
3928 - [`num::NonZeroU32`]
3929 - [`num::NonZeroU64`]
3930 - [`num::NonZeroU8`]
3931 - [`ops::RangeBounds`]
3932 - [`slice::SliceIndex`]
3933 - [`slice::from_mut`]
3934 - [`slice::from_ref`]
3935 - [`{Any + Send + Sync}::downcast_mut`]
3936 - [`{Any + Send + Sync}::downcast_ref`]
3937 - [`{Any + Send + Sync}::is`]
3941 - [Cargo will now no longer allow you to publish crates with build scripts that
3942 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3943 considered to be immutable.
3947 - [The `suggestion_applicability` field in `rustc`'s json output is now
3948 stable.][50486] This will allow dev tools to check whether a code suggestion
3949 would apply to them.
3953 - [Rust will consider trait objects with duplicated constraints to be the same
3954 type as without the duplicated constraint.][51276] For example the below code will
3955 now fail to compile.
3960 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3963 impl Trait + Send + Send {
3964 fn test(&self) { println!("two"); }
3968 [49546]: https://github.com/rust-lang/rust/pull/49546/
3969 [50143]: https://github.com/rust-lang/rust/pull/50143/
3970 [50170]: https://github.com/rust-lang/rust/pull/50170/
3971 [50234]: https://github.com/rust-lang/rust/pull/50234/
3972 [50265]: https://github.com/rust-lang/rust/pull/50265/
3973 [50364]: https://github.com/rust-lang/rust/pull/50364/
3974 [50385]: https://github.com/rust-lang/rust/pull/50385/
3975 [50465]: https://github.com/rust-lang/rust/pull/50465/
3976 [50486]: https://github.com/rust-lang/rust/pull/50486/
3977 [50554]: https://github.com/rust-lang/rust/pull/50554/
3978 [50610]: https://github.com/rust-lang/rust/pull/50610/
3979 [50855]: https://github.com/rust-lang/rust/pull/50855/
3980 [51050]: https://github.com/rust-lang/rust/pull/51050/
3981 [51196]: https://github.com/rust-lang/rust/pull/51196/
3982 [51200]: https://github.com/rust-lang/rust/pull/51200/
3983 [51241]: https://github.com/rust-lang/rust/pull/51241/
3984 [51276]: https://github.com/rust-lang/rust/pull/51276/
3985 [51298]: https://github.com/rust-lang/rust/pull/51298/
3986 [51306]: https://github.com/rust-lang/rust/pull/51306/
3987 [51562]: https://github.com/rust-lang/rust/pull/51562/
3988 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3989 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3990 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3991 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3992 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3993 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3994 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3995 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3996 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3997 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3998 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3999 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4000 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4001 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4002 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4003 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4004 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4005 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4006 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4007 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4008 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4009 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4010 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4011 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4012 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4013 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4014 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4015 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4016 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4017 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4019 Version 1.27.2 (2018-07-20)
4020 ===========================
4025 - The borrow checker was fixed to avoid potential unsoundness when using
4026 match ergonomics: [#52213][52213].
4028 [52213]: https://github.com/rust-lang/rust/issues/52213
4030 Version 1.27.1 (2018-07-10)
4031 ===========================
4036 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4037 when running, which enabled executing code as some other user on a
4038 given machine. This release fixes that vulnerability; you can read
4039 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4041 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4046 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4047 match ergonomics: [#51415][51415], [#49534][49534].
4049 [51415]: https://github.com/rust-lang/rust/issues/51415
4050 [49534]: https://github.com/rust-lang/rust/issues/49534
4051 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4052 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4054 Version 1.27.0 (2018-06-21)
4055 ==========================
4059 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4060 be used as an identifier.
4061 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4062 bare `Trait` syntax, and should make it clearer when being used in tandem with
4063 `impl Trait` because it is equivalent to the following syntax:
4064 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4065 `Box<Trait> == Box<dyn Trait>`.
4066 - [Attributes on generic parameters such as types and lifetimes are
4067 now stable.][48851] e.g.
4068 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4069 - [The `#[must_use]` attribute can now also be used on functions as well as
4070 types.][48925] It provides a lint that by default warns users when the
4071 value returned by a function has not been used.
4075 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4079 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4080 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4081 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4082 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4083 the `cfg` attribute.
4084 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4085 std are now available in core.][49896]
4086 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4088 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4089 that the operation isn't done in place.
4090 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4091 the `#[must_use]` attribute][49533] to warn about unused potentially
4092 expensive allocations.
4096 - [`DoubleEndedIterator::rfind`]
4097 - [`DoubleEndedIterator::rfold`]
4098 - [`DoubleEndedIterator::try_rfold`]
4099 - [`Duration::from_micros`]
4100 - [`Duration::from_nanos`]
4101 - [`Duration::subsec_micros`]
4102 - [`Duration::subsec_millis`]
4103 - [`HashMap::remove_entry`]
4104 - [`Iterator::try_fold`]
4105 - [`Iterator::try_for_each`]
4107 - [`Option::filter`]
4108 - [`String::replace_range`]
4109 - [`Take::set_limit`]
4110 - [`hint::unreachable_unchecked`]
4111 - [`os::unix::process::parent_id`]
4112 - [`ptr::swap_nonoverlapping`]
4113 - [`slice::rsplit_mut`]
4115 - [`slice::swap_with_slice`]
4119 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4120 `readme`, and `repository` fields.][cargo/5386]
4121 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4122 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4123 a different directory than `target` for placing compilation artifacts.
4124 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4125 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4126 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4127 where cargo would infer a binary, Cargo will produce a warning. You can
4128 disable this feature ahead of time by setting any of the following to false:
4129 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4130 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4131 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4135 - [Added “The Rustc book” into the official documentation.][49707]
4136 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4137 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4141 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4142 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4143 compile, `"".is_empty()` will still compile.
4144 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4145 will only print the inner type.][48553] E.g.
4146 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4147 not `AtomicBool(true)`.
4148 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4149 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4150 alignment should cover all use cases.
4151 - The `.description()` method on the `std::error::Error` trait
4152 [has been soft-deprecated][50163]. It is no longer required to implement it.
4154 [48553]: https://github.com/rust-lang/rust/pull/48553/
4155 [48851]: https://github.com/rust-lang/rust/pull/48851/
4156 [48925]: https://github.com/rust-lang/rust/pull/48925/
4157 [49533]: https://github.com/rust-lang/rust/pull/49533/
4158 [49623]: https://github.com/rust-lang/rust/pull/49623/
4159 [49630]: https://github.com/rust-lang/rust/pull/49630/
4160 [49664]: https://github.com/rust-lang/rust/pull/49664/
4161 [49699]: https://github.com/rust-lang/rust/pull/49699/
4162 [49707]: https://github.com/rust-lang/rust/pull/49707/
4163 [49719]: https://github.com/rust-lang/rust/pull/49719/
4164 [49896]: https://github.com/rust-lang/rust/pull/49896/
4165 [49968]: https://github.com/rust-lang/rust/pull/49968/
4166 [50163]: https://github.com/rust-lang/rust/pull/50163
4167 [50177]: https://github.com/rust-lang/rust/pull/50177/
4168 [50378]: https://github.com/rust-lang/rust/pull/50378/
4169 [50398]: https://github.com/rust-lang/rust/pull/50398/
4170 [50423]: https://github.com/rust-lang/rust/pull/50423/
4171 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4172 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4173 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4174 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4175 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4176 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4177 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4178 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4179 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4180 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4181 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4182 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4183 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4184 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4185 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4186 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4187 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4188 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4189 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4190 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4191 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4192 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4193 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4194 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4195 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4196 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4197 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4198 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4199 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4200 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4203 Version 1.26.2 (2018-06-05)
4204 ==========================
4209 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4211 [51117]: https://github.com/rust-lang/rust/issues/51117
4214 Version 1.26.1 (2018-05-29)
4215 ==========================
4220 - [RLS now works on Windows.][50646]
4221 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4227 - [`fn main() -> impl Trait` no longer works for non-Termination
4229 This reverts an accidental stabilization.
4230 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4231 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4233 [50646]: https://github.com/rust-lang/rust/issues/50646
4234 [50656]: https://github.com/rust-lang/rust/pull/50656
4235 [50812]: https://github.com/rust-lang/rust/pull/50812
4236 [50950]: https://github.com/rust-lang/rust/issues/50950
4237 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4239 Version 1.26.0 (2018-05-10)
4240 ==========================
4244 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4245 implement either or both traits.][49299]
4246 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4247 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4248 lifetime can be elided.][49458]
4249 - [`impl Trait` is now stable allowing you to have abstract types in returns
4250 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4251 `fn open(path: impl AsRef<Path>)`.
4252 - [Pattern matching will now automatically apply dereferences.][49394]
4253 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4254 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4255 - [A lot of operations are now available in a const context.][46882] E.g. You
4256 can now index into constant arrays, reference and dereference into constants,
4257 and use tuple struct constructors.
4258 - [Fixed entry slice patterns are now stable.][48516] E.g.
4260 let points = [1, 2, 3, 4];
4262 [1, 2, 3, 4] => println!("All points were sequential."),
4263 _ => println!("Not all points were sequential."),
4270 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4271 - [Fixed exponential projection complexity on nested types.][48296]
4272 This can provide up to a ~12% reduction in compile times for certain crates.
4273 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4274 to remap path prefixes outputted by the compiler.
4275 - [Added `powerpc-unknown-netbsd` target.][48281]
4279 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4280 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4281 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4282 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4283 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4284 - [`ascii::escape_default` is now available in libcore.][48735]
4285 - [Trailing commas are now supported in std and core macros.][48056]
4286 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4287 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4292 - [`*const T::copy_to_nonoverlapping`]
4293 - [`*const T::copy_to`]
4294 - [`*const T::read_unaligned`]
4295 - [`*const T::read_volatile`]
4296 - [`*const T::read`]
4298 - [`*const T::wrapping_add`]
4299 - [`*const T::wrapping_sub`]
4301 - [`*mut T::copy_to_nonoverlapping`]
4302 - [`*mut T::copy_to`]
4303 - [`*mut T::read_unaligned`]
4304 - [`*mut T::read_volatile`]
4306 - [`*mut T::replace`]
4309 - [`*mut T::wrapping_add`]
4310 - [`*mut T::wrapping_sub`]
4311 - [`*mut T::write_bytes`]
4312 - [`*mut T::write_unaligned`]
4313 - [`*mut T::write_volatile`]
4316 - [`FromUtf8Error::as_bytes`]
4317 - [`LocalKey::try_with`]
4318 - [`Option::cloned`]
4319 - [`btree_map::Entry::and_modify`]
4320 - [`fs::read_to_string`]
4323 - [`hash_map::Entry::and_modify`]
4324 - [`iter::FusedIterator`]
4325 - [`ops::RangeInclusive`]
4326 - [`ops::RangeToInclusive`]
4328 - [`slice::rotate_left`]
4329 - [`slice::rotate_right`]
4330 - [`String::retain`]
4335 - [Cargo will now output path to custom commands when `-v` is
4336 passed with `--list`][cargo/5041]
4337 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4341 - [The second edition of "The Rust Programming Language" book is now recommended
4342 over the first.][48404]
4347 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4348 syntax is now invalid.
4350 use std::ops::Fn as dyn;
4351 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4353 - [The result of dereferences are no longer promoted to `'static`.][47408]
4357 const PAIR: &(i32, i32) = &(0, 1);
4358 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4361 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4362 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4364 - [Removed hoedown from rustdoc.][48274]
4365 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4367 [46882]: https://github.com/rust-lang/rust/pull/46882
4368 [47379]: https://github.com/rust-lang/rust/pull/47379
4369 [47408]: https://github.com/rust-lang/rust/pull/47408
4370 [47813]: https://github.com/rust-lang/rust/pull/47813
4371 [48056]: https://github.com/rust-lang/rust/pull/48056
4372 [48125]: https://github.com/rust-lang/rust/pull/48125
4373 [48166]: https://github.com/rust-lang/rust/pull/48166
4374 [48235]: https://github.com/rust-lang/rust/pull/48235
4375 [48274]: https://github.com/rust-lang/rust/pull/48274
4376 [48281]: https://github.com/rust-lang/rust/pull/48281
4377 [48296]: https://github.com/rust-lang/rust/pull/48296
4378 [48326]: https://github.com/rust-lang/rust/pull/48326
4379 [48359]: https://github.com/rust-lang/rust/pull/48359
4380 [48404]: https://github.com/rust-lang/rust/pull/48404
4381 [48481]: https://github.com/rust-lang/rust/pull/48481
4382 [48516]: https://github.com/rust-lang/rust/pull/48516
4383 [48628]: https://github.com/rust-lang/rust/pull/48628
4384 [48629]: https://github.com/rust-lang/rust/pull/48629
4385 [48657]: https://github.com/rust-lang/rust/pull/48657
4386 [48735]: https://github.com/rust-lang/rust/pull/48735
4387 [48978]: https://github.com/rust-lang/rust/pull/48978
4388 [49101]: https://github.com/rust-lang/rust/pull/49101
4389 [49109]: https://github.com/rust-lang/rust/pull/49109
4390 [49121]: https://github.com/rust-lang/rust/pull/49121
4391 [49162]: https://github.com/rust-lang/rust/pull/49162
4392 [49184]: https://github.com/rust-lang/rust/pull/49184
4393 [49234]: https://github.com/rust-lang/rust/pull/49234
4394 [49255]: https://github.com/rust-lang/rust/pull/49255
4395 [49299]: https://github.com/rust-lang/rust/pull/49299
4396 [49305]: https://github.com/rust-lang/rust/pull/49305
4397 [49394]: https://github.com/rust-lang/rust/pull/49394
4398 [49458]: https://github.com/rust-lang/rust/pull/49458
4399 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4400 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4401 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4402 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4403 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4404 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4405 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4406 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4407 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4408 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4409 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4410 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4411 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4412 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4413 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4414 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4415 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4416 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4417 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4418 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4419 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4420 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4421 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4422 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4423 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4424 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4425 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4426 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4427 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4428 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4429 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4430 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4431 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4432 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4433 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4434 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4435 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4436 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4437 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4438 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4439 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4440 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4443 Version 1.25.0 (2018-03-29)
4444 ==========================
4448 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4449 - [You can now use nested groups of imports.][47948]
4450 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4451 - [You can now have `|` at the start of a match arm.][47947] e.g.
4453 enum Foo { A, B, C }
4459 | Foo::B => println!("AB"),
4460 | Foo::C => println!("C"),
4467 - [Upgraded to LLVM 6.][47828]
4468 - [Added `-C lto=val` option.][47521]
4469 - [Added `i586-unknown-linux-musl` target][47282]
4473 - [Impl Send for `process::Command` on Unix.][47760]
4474 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4475 - [`UnsafeCell::into_inner` is now safe.][47204]
4476 - [Implement libstd for CloudABI.][47268]
4477 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4478 - [Implement `AsRef<Path>` for Component][46985]
4479 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4480 - [Moved `Duration` to libcore.][46666]
4484 - [`Location::column`]
4487 The following functions can now be used in a constant expression.
4488 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4489 - [`Duration::new`][47300]
4490 - [`Duration::from_secs`][47300]
4491 - [`Duration::from_millis`][47300]
4495 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4496 - [`cargo new` now defaults to creating a binary crate, instead of a
4497 library crate.][cargo/5029]
4501 - [Rust by example is now shipped with new releases][46196]
4505 - [Deprecated `net::lookup_host`.][47510]
4506 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4507 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4508 around indexing operations (see [#47349][47349]). This has been fixed (which also
4509 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4510 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4512 [33903]: https://github.com/rust-lang/rust/pull/33903
4513 [47947]: https://github.com/rust-lang/rust/pull/47947
4514 [47948]: https://github.com/rust-lang/rust/pull/47948
4515 [47760]: https://github.com/rust-lang/rust/pull/47760
4516 [47790]: https://github.com/rust-lang/rust/pull/47790
4517 [47828]: https://github.com/rust-lang/rust/pull/47828
4518 [47398]: https://github.com/rust-lang/rust/pull/47398
4519 [47510]: https://github.com/rust-lang/rust/pull/47510
4520 [47521]: https://github.com/rust-lang/rust/pull/47521
4521 [47204]: https://github.com/rust-lang/rust/pull/47204
4522 [47251]: https://github.com/rust-lang/rust/pull/47251
4523 [47268]: https://github.com/rust-lang/rust/pull/47268
4524 [47282]: https://github.com/rust-lang/rust/pull/47282
4525 [47300]: https://github.com/rust-lang/rust/pull/47300
4526 [47349]: https://github.com/rust-lang/rust/pull/47349
4527 [46931]: https://github.com/rust-lang/rust/pull/46931
4528 [46985]: https://github.com/rust-lang/rust/pull/46985
4529 [47006]: https://github.com/rust-lang/rust/pull/47006
4530 [46830]: https://github.com/rust-lang/rust/pull/46830
4531 [46095]: https://github.com/rust-lang/rust/pull/46095
4532 [46666]: https://github.com/rust-lang/rust/pull/46666
4533 [46196]: https://github.com/rust-lang/rust/pull/46196
4534 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4535 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4536 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4537 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4538 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4541 Version 1.24.1 (2018-03-01)
4542 ==========================
4544 - [Do not abort when unwinding through FFI][48251]
4545 - [Emit UTF-16 files for linker arguments on Windows][48318]
4546 - [Make the error index generator work again][48308]
4547 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4549 [48251]: https://github.com/rust-lang/rust/issues/48251
4550 [48308]: https://github.com/rust-lang/rust/issues/48308
4551 [48318]: https://github.com/rust-lang/rust/issues/48318
4552 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4555 Version 1.24.0 (2018-02-15)
4556 ==========================
4560 - [External `sysv64` ffi is now available.][46528]
4561 eg. `extern "sysv64" fn foo () {}`
4565 - [rustc now uses 16 codegen units by default for release builds.][46910]
4566 For the fastest builds, utilize `codegen-units=1`.
4567 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4568 - [Add `aarch64-unknown-openbsd` support][46760]
4572 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4573 improvement in performance in the majority of cases.
4574 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4575 with Windows.][46798]
4576 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4577 - [impl `From<bool>` for `AtomicBool`][46293]
4578 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4579 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4580 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4581 - [float::from_bits now just uses transmute.][46012] This provides
4582 some optimisations from LLVM.
4583 - [Copied `AsciiExt` methods onto `char`][46077]
4584 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4585 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4586 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4587 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4591 - [`RefCell::replace`]
4593 - [`atomic::spin_loop_hint`]
4595 The following functions can now be used in a constant expression.
4596 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4598 - [`AtomicBool::new`][46287]
4599 - [`AtomicUsize::new`][46287]
4600 - [`AtomicIsize::new`][46287]
4601 - [`AtomicPtr::new`][46287]
4602 - [`Cell::new`][46287]
4603 - [`{integer}::min_value`][46287]
4604 - [`{integer}::max_value`][46287]
4605 - [`mem::size_of`][46287]
4606 - [`mem::align_of`][46287]
4607 - [`ptr::null`][46287]
4608 - [`ptr::null_mut`][46287]
4609 - [`RefCell::new`][46287]
4610 - [`UnsafeCell::new`][46287]
4614 - [Added a `workspace.default-members` config that
4615 overrides implied `--all` in virtual workspaces.][cargo/4743]
4616 - [Enable incremental by default on development builds.][cargo/4817] Also added
4617 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4618 per-project or global basis respectively.
4625 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4626 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4627 in accordance with IETF RFC 4291 §2.2.
4628 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4629 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4630 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4631 - [Leading zeros in tuple struct members is now an error][47084]
4632 - [`column!()` macro is one-based instead of zero-based][46977]
4633 - [`fmt::Arguments` can no longer be shared across threads][45198]
4634 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4635 - [Cargo sets a different working directory for the compiler][cargo/4788]
4637 [44884]: https://github.com/rust-lang/rust/pull/44884
4638 [45198]: https://github.com/rust-lang/rust/pull/45198
4639 [45506]: https://github.com/rust-lang/rust/pull/45506
4640 [45904]: https://github.com/rust-lang/rust/pull/45904
4641 [45990]: https://github.com/rust-lang/rust/pull/45990
4642 [46012]: https://github.com/rust-lang/rust/pull/46012
4643 [46077]: https://github.com/rust-lang/rust/pull/46077
4644 [46094]: https://github.com/rust-lang/rust/pull/46094
4645 [46284]: https://github.com/rust-lang/rust/pull/46284
4646 [46287]: https://github.com/rust-lang/rust/pull/46287
4647 [46293]: https://github.com/rust-lang/rust/pull/46293
4648 [46528]: https://github.com/rust-lang/rust/pull/46528
4649 [46671]: https://github.com/rust-lang/rust/pull/46671
4650 [46713]: https://github.com/rust-lang/rust/pull/46713
4651 [46735]: https://github.com/rust-lang/rust/pull/46735
4652 [46749]: https://github.com/rust-lang/rust/pull/46749
4653 [46760]: https://github.com/rust-lang/rust/pull/46760
4654 [46798]: https://github.com/rust-lang/rust/pull/46798
4655 [46828]: https://github.com/rust-lang/rust/pull/46828
4656 [46831]: https://github.com/rust-lang/rust/pull/46831
4657 [46833]: https://github.com/rust-lang/rust/pull/46833
4658 [46910]: https://github.com/rust-lang/rust/pull/46910
4659 [46977]: https://github.com/rust-lang/rust/pull/46977
4660 [47018]: https://github.com/rust-lang/rust/pull/47018
4661 [47080]: https://github.com/rust-lang/rust/pull/47080
4662 [47084]: https://github.com/rust-lang/rust/pull/47084
4663 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4664 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4665 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4666 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4667 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4668 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4671 Version 1.23.0 (2018-01-04)
4672 ==========================
4676 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4677 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4678 Which should fix some confusing errors in some operations.
4682 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4683 undefined behavior.][45920]
4684 - [rustc now suggests renaming import if names clash.][45660]
4685 - [Display errors/warnings correctly when there are zero-width or
4686 wide characters.][45711]
4687 - [rustc now avoids unnecessary copies of arguments that are
4688 simple bindings][45380] This should improve memory usage on average by 5-10%.
4689 - [Updated musl used to build musl rustc to 1.1.17][45393]
4693 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4694 - [Implement Hash for raw pointers to unsized types][45483]
4695 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4696 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4697 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4698 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4699 and `<*mut T>::as_mut`][44932]
4700 - [Optimized `Thread::{park, unpark}` implementation][45524]
4701 - [Improved `SliceExt::binary_search` performance.][45333]
4702 - [impl `FromIterator<()>` for `()`][45379]
4703 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4711 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4712 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4713 - [Added unit test checking to `cargo check`][cargo/4592]
4714 - [Cargo now lets you install a specific version
4715 using `cargo install --version`][cargo/4637]
4719 - [Releases now ship with the Cargo book documentation.][45692]
4720 - [rustdoc now prints rendering warnings on every run.][45324]
4724 - [Changes have been made to type equality to make it more correct,
4725 in rare cases this could break some code.][45853] [Tracking issue for
4726 further information][45852]
4727 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4728 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4729 Android 9, the minimum supported version is Android 14.
4730 - [Bumped the minimum LLVM to 3.9][45326]
4732 [44042]: https://github.com/rust-lang/rust/pull/44042
4733 [44932]: https://github.com/rust-lang/rust/pull/44932
4734 [45267]: https://github.com/rust-lang/rust/pull/45267
4735 [45324]: https://github.com/rust-lang/rust/pull/45324
4736 [45326]: https://github.com/rust-lang/rust/pull/45326
4737 [45333]: https://github.com/rust-lang/rust/pull/45333
4738 [45379]: https://github.com/rust-lang/rust/pull/45379
4739 [45380]: https://github.com/rust-lang/rust/pull/45380
4740 [45393]: https://github.com/rust-lang/rust/pull/45393
4741 [45435]: https://github.com/rust-lang/rust/pull/45435
4742 [45483]: https://github.com/rust-lang/rust/pull/45483
4743 [45524]: https://github.com/rust-lang/rust/pull/45524
4744 [45571]: https://github.com/rust-lang/rust/pull/45571
4745 [45580]: https://github.com/rust-lang/rust/pull/45580
4746 [45610]: https://github.com/rust-lang/rust/pull/45610
4747 [45660]: https://github.com/rust-lang/rust/pull/45660
4748 [45692]: https://github.com/rust-lang/rust/pull/45692
4749 [45711]: https://github.com/rust-lang/rust/pull/45711
4750 [45772]: https://github.com/rust-lang/rust/pull/45772
4751 [45852]: https://github.com/rust-lang/rust/issues/45852
4752 [45853]: https://github.com/rust-lang/rust/pull/45853
4753 [45887]: https://github.com/rust-lang/rust/pull/45887
4754 [45920]: https://github.com/rust-lang/rust/pull/45920
4755 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4756 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4757 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4760 Version 1.22.1 (2017-11-22)
4761 ==========================
4763 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4765 [46183]: https://github.com/rust-lang/rust/pull/46183
4767 Version 1.22.0 (2017-11-22)
4768 ==========================
4772 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4773 - [Now accepts underscores in unicode escapes][43716]
4774 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4775 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4779 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4780 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4781 This should decrease compile times for debug builds.
4782 - [strict memory alignment now enabled on ARMv6][45094]
4783 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4787 - [Allow atomic operations up to 32 bits
4788 on `armv5te_unknown_linux_gnueabi`][44978]
4789 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4790 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4791 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4792 - [Properly detect overflow in `Instant += Duration`.][44220]
4793 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4794 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4795 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4802 - [Cargo will now build multi file examples in subdirectories of the `examples`
4803 folder that have a `main.rs` file.][cargo/4496]
4804 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4805 the old format will continue to work and can be updated with `cargo update`.
4806 - [Now supports vendoring git repositories][cargo/3992]
4810 - [`libbacktrace` is now available on Apple platforms.][44251]
4811 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4812 This now lets you specify that a given code example will fail to compile.
4816 - [The minimum Android version that rustc can build for has been bumped
4817 to `4.0` from `2.3`][45656]
4818 - [Allowing `T op= &T` for numeric types has broken some type
4819 inference cases][45480]
4822 [42526]: https://github.com/rust-lang/rust/pull/42526
4823 [43017]: https://github.com/rust-lang/rust/pull/43017
4824 [43716]: https://github.com/rust-lang/rust/pull/43716
4825 [43949]: https://github.com/rust-lang/rust/pull/43949
4826 [44015]: https://github.com/rust-lang/rust/pull/44015
4827 [44220]: https://github.com/rust-lang/rust/pull/44220
4828 [44251]: https://github.com/rust-lang/rust/pull/44251
4829 [44287]: https://github.com/rust-lang/rust/pull/44287
4830 [44303]: https://github.com/rust-lang/rust/pull/44303
4831 [44456]: https://github.com/rust-lang/rust/pull/44456
4832 [44466]: https://github.com/rust-lang/rust/pull/44466
4833 [44895]: https://github.com/rust-lang/rust/pull/44895
4834 [44966]: https://github.com/rust-lang/rust/pull/44966
4835 [44978]: https://github.com/rust-lang/rust/pull/44978
4836 [45041]: https://github.com/rust-lang/rust/pull/45041
4837 [45064]: https://github.com/rust-lang/rust/pull/45064
4838 [45075]: https://github.com/rust-lang/rust/pull/45075
4839 [45094]: https://github.com/rust-lang/rust/pull/45094
4840 [45095]: https://github.com/rust-lang/rust/pull/45095
4841 [45480]: https://github.com/rust-lang/rust/issues/45480
4842 [45656]: https://github.com/rust-lang/rust/pull/45656
4843 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4844 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4845 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4852 Version 1.21.0 (2017-10-12)
4853 ==========================
4857 - [You can now use static references for literals.][43838]
4861 let x: &'static u32 = &0;
4864 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4867 my_macro!(Vec<i32>::new); // Always worked
4868 my_macro!(Vec::<i32>::new); // Now works
4873 - [Upgraded jemalloc to 4.5.0][43911]
4874 - [Enabled unwinding panics on Redox][43917]
4875 - [Now runs LLVM in parallel during translation phase.][43506]
4876 This should reduce peak memory usage.
4880 - [Generate builtin impls for `Clone` for all arrays and tuples that
4881 are `T: Clone`][43690]
4882 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4883 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4884 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4889 [`std::mem::discriminant`]
4893 - [You can now call `cargo install` with multiple package names][cargo/4216]
4894 - [Cargo commands inside a virtual workspace will now implicitly
4895 pass `--all`][cargo/4335]
4896 - [Added a `[patch]` section to `Cargo.toml` to handle
4897 prepublication dependencies][cargo/4123] [RFC 1969]
4898 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4899 like patterns][cargo/4270]
4900 - [Added the `--all-targets` option][cargo/4400]
4901 - [Using required dependencies as a feature is now deprecated and emits
4902 a warning][cargo/4364]
4907 - [Cargo docs are moving][43916]
4908 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4909 - [The rustdoc book is now available][43863]
4910 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4911 - [Added a preview of RLS has been made available through rustup][44204]
4912 Install with `rustup component add rls-preview`
4913 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4914 Previously only showed `std::os::unix`.
4918 - [Changes in method matching against higher-ranked types][43880] This may cause
4919 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4920 - [rustc's JSON error output's byte position start at top of file.][42973]
4921 Was previously relative to the rustc's internal `CodeMap` struct which
4922 required the unstable library `libsyntax` to correctly use.
4923 - [`unused_results` lint no longer ignores booleans][43728]
4925 [42565]: https://github.com/rust-lang/rust/pull/42565
4926 [42973]: https://github.com/rust-lang/rust/pull/42973
4927 [43348]: https://github.com/rust-lang/rust/pull/43348
4928 [43459]: https://github.com/rust-lang/rust/pull/43459
4929 [43506]: https://github.com/rust-lang/rust/pull/43506
4930 [43540]: https://github.com/rust-lang/rust/pull/43540
4931 [43690]: https://github.com/rust-lang/rust/pull/43690
4932 [43728]: https://github.com/rust-lang/rust/pull/43728
4933 [43838]: https://github.com/rust-lang/rust/pull/43838
4934 [43863]: https://github.com/rust-lang/rust/pull/43863
4935 [43880]: https://github.com/rust-lang/rust/pull/43880
4936 [43911]: https://github.com/rust-lang/rust/pull/43911
4937 [43916]: https://github.com/rust-lang/rust/pull/43916
4938 [43917]: https://github.com/rust-lang/rust/pull/43917
4939 [44204]: https://github.com/rust-lang/rust/pull/44204
4940 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4941 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4942 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4943 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4944 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4945 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4946 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4947 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4948 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4950 Version 1.20.0 (2017-08-31)
4951 ===========================
4955 - [Associated constants are now stabilised.][42809]
4956 - [A lot of macro bugs are now fixed.][42913]
4961 - [Struct fields are now properly coerced to the expected field type.][42807]
4962 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4963 `wasm32-experimental-emscripten` target.
4964 - [Changed some of the error messages to be more helpful.][42033]
4965 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4967 - [rustc now reports the total number of errors on compilation failure][43015]
4968 previously this was only the number of errors in the pass that failed.
4969 - [Expansion in rustc has been sped up 29x.][42533]
4970 - [added `msp430-none-elf` target.][43099]
4971 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4973 - [Fixes backtraces on Redox][43228]
4974 - [rustc now identifies different versions of same crate when absolute paths of
4975 different types match in an error message.][42826]
4981 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4982 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4984 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4985 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4986 - [Impl `Clone` for `DefaultHasher`.][42799]
4987 - [Impl `Sync` for `SyncSender`.][42397]
4988 - [Impl `FromStr` for `char`][42271]
4989 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4991 - [allow messages in the `unimplemented!()` macro.][42155]
4992 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4993 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4994 - [Upgrade to Unicode 10.0.0][42999]
4995 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4996 - [Skip the main thread's manual stack guard on Linux][43072]
4997 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4998 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5000 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5005 - [`CStr::into_c_string`]
5006 - [`CString::as_c_str`]
5007 - [`CString::into_boxed_c_str`]
5008 - [`Chain::get_mut`]
5009 - [`Chain::get_ref`]
5010 - [`Chain::into_inner`]
5011 - [`Option::get_or_insert_with`]
5012 - [`Option::get_or_insert`]
5013 - [`OsStr::into_os_string`]
5014 - [`OsString::into_boxed_os_str`]
5017 - [`Utf8Error::error_len`]
5018 - [`char::EscapeDebug`]
5019 - [`char::escape_debug`]
5020 - [`compile_error!`]
5021 - [`f32::from_bits`]
5023 - [`f64::from_bits`]
5025 - [`mem::ManuallyDrop`]
5026 - [`slice::sort_unstable_by_key`]
5027 - [`slice::sort_unstable_by`]
5028 - [`slice::sort_unstable`]
5029 - [`str::from_boxed_utf8_unchecked`]
5030 - [`str::as_bytes_mut`]
5031 - [`str::as_bytes_mut`]
5032 - [`str::from_utf8_mut`]
5033 - [`str::from_utf8_unchecked_mut`]
5035 - [`str::get_unchecked_mut`]
5036 - [`str::get_unchecked`]
5038 - [`str::into_boxed_bytes`]
5043 - [Cargo API token location moved from `~/.cargo/config` to
5044 `~/.cargo/credentials`.][cargo/3978]
5045 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5046 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5047 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5048 - [You can now specify version of a binary when installed through
5049 `cargo install` using `--vers`.][cargo/4229]
5050 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5051 failure.][cargo/4248]
5052 - [Changed the convention around which file is the crate root.][cargo/4259]
5053 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5054 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5059 - [Functions with `'static` in their return types will now not be as usable as
5060 if they were using lifetime parameters instead.][42417]
5061 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5062 takes the sign of NaN into account where previously didn't.][42430]
5064 [42033]: https://github.com/rust-lang/rust/pull/42033
5065 [42155]: https://github.com/rust-lang/rust/pull/42155
5066 [42271]: https://github.com/rust-lang/rust/pull/42271
5067 [42397]: https://github.com/rust-lang/rust/pull/42397
5068 [42417]: https://github.com/rust-lang/rust/pull/42417
5069 [42430]: https://github.com/rust-lang/rust/pull/42430
5070 [42431]: https://github.com/rust-lang/rust/pull/42431
5071 [42533]: https://github.com/rust-lang/rust/pull/42533
5072 [42571]: https://github.com/rust-lang/rust/pull/42571
5073 [42613]: https://github.com/rust-lang/rust/pull/42613
5074 [42799]: https://github.com/rust-lang/rust/pull/42799
5075 [42807]: https://github.com/rust-lang/rust/pull/42807
5076 [42809]: https://github.com/rust-lang/rust/pull/42809
5077 [42822]: https://github.com/rust-lang/rust/pull/42822
5078 [42826]: https://github.com/rust-lang/rust/pull/42826
5079 [42854]: https://github.com/rust-lang/rust/pull/42854
5080 [42913]: https://github.com/rust-lang/rust/pull/42913
5081 [42999]: https://github.com/rust-lang/rust/pull/42999
5082 [43011]: https://github.com/rust-lang/rust/pull/43011
5083 [43015]: https://github.com/rust-lang/rust/pull/43015
5084 [43072]: https://github.com/rust-lang/rust/pull/43072
5085 [43077]: https://github.com/rust-lang/rust/pull/43077
5086 [43097]: https://github.com/rust-lang/rust/pull/43097
5087 [43099]: https://github.com/rust-lang/rust/pull/43099
5088 [43170]: https://github.com/rust-lang/rust/pull/43170
5089 [43178]: https://github.com/rust-lang/rust/pull/43178
5090 [43185]: https://github.com/rust-lang/rust/pull/43185
5091 [43228]: https://github.com/rust-lang/rust/pull/43228
5092 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5093 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5094 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5095 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5096 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5097 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5098 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5099 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5100 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5101 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5102 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5103 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5104 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5105 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5106 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5107 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5108 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5109 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5110 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5111 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5112 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5113 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5114 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5115 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5116 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5117 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5118 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5119 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5120 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5121 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5122 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5123 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5124 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5125 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5126 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5127 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5128 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5129 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5130 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5133 Version 1.19.0 (2017-07-20)
5134 ===========================
5139 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5140 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5141 - [Macro recursion limit increased to 1024 from 64.][41676]
5142 - [Added lint for detecting unused macros.][41907]
5143 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5144 For example: `let x = loop { break 7; };`
5145 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5146 contain `Copy` types and cannot have a `Drop` implementation.
5147 Example: `union Foo { bar: u8, baz: usize }`
5148 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5149 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5154 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5155 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5156 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5157 you should use `--target armv7-linux-androideabi`.
5158 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5159 - [Minor optimisation of string operations.][42037]
5160 - [Compiler error message is now `aborting due to previous error(s)` instead of
5161 `aborting due to N previous errors`][42150] This was previously inaccurate and
5162 would only count certain kinds of errors.
5163 - [The compiler now supports Visual Studio 2017][42225]
5164 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5165 - [Added a lot][42264] of [new error codes][42302]
5166 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5167 libraries with C Run-time Libraries(CRT) to be statically linked.
5168 - [Fixed various ARM codegen bugs][42740]
5173 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5174 `Extend<Cow<'a, str>>`][41449]
5175 - [`Vec` now implements `From<&mut [T]>`][41530]
5176 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5177 - [`SplitWhitespace` now implements `Clone`][41659]
5178 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5180 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5181 macros, but for printing to stderr.
5186 - [`OsString::shrink_to_fit`]
5189 - [`thread::ThreadId`]
5194 - [Build scripts can now add environment variables to the environment
5195 the crate is being compiled in.
5196 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5197 - [Subcommands now replace the current process rather than spawning a new
5198 child process][cargo/3970]
5199 - [Workspace members can now accept glob file patterns][cargo/3979]
5200 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5201 the members in a given workspace.][cargo/3988]
5202 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5203 - [Target directory path is now in the cargo metadata][cargo/4022]
5204 - [Cargo no longer checks out a local working directory for the
5205 crates.io index][cargo/4026] This should provide smaller file size for the
5206 registry, and improve cloning times, especially on Windows machines.
5207 - [Added an `--exclude` option for excluding certain packages when using the
5208 `--all` option][cargo/4031]
5209 - [Cargo will now automatically retry when receiving a 5xx error
5210 from crates.io][cargo/4032]
5211 - [The `--features` option now accepts multiple comma or space
5212 delimited values.][cargo/4084]
5213 - [Added support for custom target specific runners][cargo/3954]
5218 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5220 - [Rust will now release XZ compressed packages][rust-installer/57]
5221 - [rustup will now prefer to download rust packages with
5222 XZ compression][rustup/1100] over GZip packages.
5223 - [Added the ability to escape `#` in rust documentation][41785] By adding
5224 additional `#`'s ie. `##` is now `#`
5229 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5230 - [`-Z` flags are now no longer allowed to be used on the stable
5231 compiler.][41751] This has been a warning for a year previous to this.
5232 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5233 longer works][42844]. Users should migrate to the built-in `check`
5234 command, which has been available since 1.16.
5235 - [Ending a float literal with `._` is now a hard error.
5236 Example: `42._` .][41946]
5237 - [Any use of a private `extern crate` outside of its module is now a
5238 hard error.][36886] This was previously a warning.
5239 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5240 relative while the `::` prefix makes a path absolute, but was ignored and the
5241 path was relative regardless.
5242 - [Floating point constants in match patterns is now a hard error][36890]
5243 This was previously a warning.
5244 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5245 match patterns is now a hard error][36891] This was previously a warning.
5246 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5248 - [From the pound escape, lines consisting of multiple `#`s are
5250 - [It is an error to re-export private enum variants][42460]. This is
5251 known to break a number of crates that depend on an older version of
5253 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5254 to use it to find the linker, and the build will fail where it did
5255 not previously][42607]
5257 [36886]: https://github.com/rust-lang/rust/issues/36886
5258 [36888]: https://github.com/rust-lang/rust/issues/36888
5259 [36890]: https://github.com/rust-lang/rust/issues/36890
5260 [36891]: https://github.com/rust-lang/rust/issues/36891
5261 [36892]: https://github.com/rust-lang/rust/issues/36892
5262 [37406]: https://github.com/rust-lang/rust/issues/37406
5263 [39983]: https://github.com/rust-lang/rust/pull/39983
5264 [41145]: https://github.com/rust-lang/rust/pull/41145
5265 [41192]: https://github.com/rust-lang/rust/pull/41192
5266 [41258]: https://github.com/rust-lang/rust/pull/41258
5267 [41370]: https://github.com/rust-lang/rust/pull/41370
5268 [41449]: https://github.com/rust-lang/rust/pull/41449
5269 [41530]: https://github.com/rust-lang/rust/pull/41530
5270 [41624]: https://github.com/rust-lang/rust/pull/41624
5271 [41656]: https://github.com/rust-lang/rust/pull/41656
5272 [41659]: https://github.com/rust-lang/rust/pull/41659
5273 [41676]: https://github.com/rust-lang/rust/pull/41676
5274 [41751]: https://github.com/rust-lang/rust/pull/41751
5275 [41764]: https://github.com/rust-lang/rust/pull/41764
5276 [41785]: https://github.com/rust-lang/rust/pull/41785
5277 [41873]: https://github.com/rust-lang/rust/pull/41873
5278 [41907]: https://github.com/rust-lang/rust/pull/41907
5279 [41946]: https://github.com/rust-lang/rust/pull/41946
5280 [42016]: https://github.com/rust-lang/rust/pull/42016
5281 [42037]: https://github.com/rust-lang/rust/pull/42037
5282 [42068]: https://github.com/rust-lang/rust/pull/42068
5283 [42150]: https://github.com/rust-lang/rust/pull/42150
5284 [42162]: https://github.com/rust-lang/rust/pull/42162
5285 [42225]: https://github.com/rust-lang/rust/pull/42225
5286 [42264]: https://github.com/rust-lang/rust/pull/42264
5287 [42302]: https://github.com/rust-lang/rust/pull/42302
5288 [42460]: https://github.com/rust-lang/rust/issues/42460
5289 [42607]: https://github.com/rust-lang/rust/issues/42607
5290 [42740]: https://github.com/rust-lang/rust/pull/42740
5291 [42844]: https://github.com/rust-lang/rust/issues/42844
5292 [42948]: https://github.com/rust-lang/rust/pull/42948
5293 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5294 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5295 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5296 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5297 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5298 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5299 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5300 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5301 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5302 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5303 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5304 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5305 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5306 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5307 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5308 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5309 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5310 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5311 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5312 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5313 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5314 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5317 Version 1.18.0 (2017-06-08)
5318 ===========================
5323 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5324 make the item visible to just that module tree. Also accepts the keyword
5325 `crate` to make something public to the whole crate but not users of the
5326 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5327 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5328 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5329 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5330 types like `Write + Send`, trailing `+` are now supported in trait objects,
5331 and better error reporting for trait objects starting with `?Sized`.
5332 - [0e+10 is now a valid floating point literal][40589]
5333 - [Now warns if you bind a lifetime parameter to 'static][40734]
5334 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5335 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5336 representation in some cases.][40377]
5341 - [rustc can now emit mir with `--emit mir`][39891]
5342 - [Improved LLVM IR for trivial functions][40367]
5343 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5344 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5345 opportunities found through profiling
5346 - [Improved backtrace formatting when panicking][38165]
5351 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5352 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5353 iteration or reallocation.
5354 - [Simplified HashMap Bucket interface][40561] provides performance
5355 improvements for iterating and cloning.
5356 - [Specialize Vec::from_elem to use calloc][40409]
5357 - [Fixed Race condition in fs::create_dir_all][39799]
5358 - [No longer caching stdio on Windows][40516]
5359 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5360 2.50%~ faster and in one case now 12.50% faster.
5361 - [Optimized `AtomicBool::fetch_nand`][41143]
5366 - [`Child::try_wait`]
5367 - [`HashMap::retain`]
5368 - [`HashSet::retain`]
5370 - [`TcpStream::peek`]
5371 - [`UdpSocket::peek`]
5372 - [`UdpSocket::peek_from`]
5377 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5378 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5379 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5380 - [Added Android build support][cargo/3885]
5381 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5382 of a certain type, for example `cargo build --bins` will build all
5384 - [Added support for haiku][cargo/3952]
5389 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5390 - [Added rust-windbg script for better debugging on Windows][39983]
5391 - [Rust now uses the official cross compiler for NetBSD][40612]
5392 - [rustdoc now accepts `#` at the start of files][40828]
5393 - [Fixed jemalloc support for musl][41168]
5398 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5399 always placed after the sign if it exists and before the digits. With the `#`
5400 flag the zeroes are placed after the prefix and before the digits.
5401 - [Due to the struct field optimisation][40377], using `transmute` on structs
5402 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5403 always been undefined behavior, but is now more likely to break in practice.
5404 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5405 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5406 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5407 - [Overlapping inherent `impl`s are now a hard error][40728]
5408 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5409 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5410 `out.asm` and `out.ll` instead of only one of the filetypes.
5411 - [ calling a function that returns `Self` will no longer work][41805] when
5412 the size of `Self` cannot be statically determined.
5413 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5414 this has caused a few regressions namely:
5416 - Changed the link order of local static/dynamic libraries (respecting the
5417 order on given rather than having the compiler reorder).
5418 - Changed how MinGW is linked, native code linked to dynamic libraries
5419 may require manually linking to the gcc support library (for the native
5422 [38165]: https://github.com/rust-lang/rust/pull/38165
5423 [39799]: https://github.com/rust-lang/rust/pull/39799
5424 [39891]: https://github.com/rust-lang/rust/pull/39891
5425 [39983]: https://github.com/rust-lang/rust/pull/39983
5426 [40043]: https://github.com/rust-lang/rust/pull/40043
5427 [40241]: https://github.com/rust-lang/rust/pull/40241
5428 [40338]: https://github.com/rust-lang/rust/pull/40338
5429 [40367]: https://github.com/rust-lang/rust/pull/40367
5430 [40377]: https://github.com/rust-lang/rust/pull/40377
5431 [40409]: https://github.com/rust-lang/rust/pull/40409
5432 [40516]: https://github.com/rust-lang/rust/pull/40516
5433 [40556]: https://github.com/rust-lang/rust/pull/40556
5434 [40561]: https://github.com/rust-lang/rust/pull/40561
5435 [40589]: https://github.com/rust-lang/rust/pull/40589
5436 [40612]: https://github.com/rust-lang/rust/pull/40612
5437 [40723]: https://github.com/rust-lang/rust/pull/40723
5438 [40728]: https://github.com/rust-lang/rust/pull/40728
5439 [40731]: https://github.com/rust-lang/rust/pull/40731
5440 [40734]: https://github.com/rust-lang/rust/pull/40734
5441 [40805]: https://github.com/rust-lang/rust/pull/40805
5442 [40807]: https://github.com/rust-lang/rust/pull/40807
5443 [40828]: https://github.com/rust-lang/rust/pull/40828
5444 [40870]: https://github.com/rust-lang/rust/pull/40870
5445 [41085]: https://github.com/rust-lang/rust/pull/41085
5446 [41143]: https://github.com/rust-lang/rust/pull/41143
5447 [41168]: https://github.com/rust-lang/rust/pull/41168
5448 [41270]: https://github.com/rust-lang/rust/issues/41270
5449 [41469]: https://github.com/rust-lang/rust/pull/41469
5450 [41805]: https://github.com/rust-lang/rust/issues/41805
5451 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5452 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5453 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5454 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5455 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5456 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5457 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5458 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5459 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5460 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5461 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5462 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5463 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5464 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5467 Version 1.17.0 (2017-04-27)
5468 ===========================
5473 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5474 * [Fields of structs may be initialized without duplicating the field/variable
5475 names][39761]. [RFC 1682]
5476 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5477 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5478 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5479 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5480 `'b`. Soundness fix.
5481 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5482 * [Static variables may contain references to other statics][40027]
5487 * [Exit quickly on only `--emit dep-info`][40336]
5488 * [Make `-C relocation-model` more correctly determine whether the linker
5489 creates a position-independent executable][40245]
5490 * [Add `-C overflow-checks` to directly control whether integer overflow
5492 * [The rustc type checker now checks items on demand instead of in a single
5493 in-order pass][40008]. This is mostly an internal refactoring in support of
5494 future work, including incremental type checking, but also resolves [RFC
5495 1647], allowing `Self` to appear in `impl` `where` clauses.
5496 * [Optimize vtable loads][39995]
5497 * [Turn off vectorization for Emscripten targets][39990]
5498 * [Provide suggestions for unknown macros imported with `use`][39953]
5499 * [Fix ICEs in path resolution][39939]
5500 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5501 * [Add clearer error message using `&str + &str`][39116]
5512 * [`Ordering::then`]
5513 * [`Ordering::then_with`]
5514 * [`BTreeMap::range`]
5515 * [`BTreeMap::range_mut`]
5516 * [`collections::Bound`]
5517 * [`process::abort`]
5518 * [`ptr::read_unaligned`]
5519 * [`ptr::write_unaligned`]
5520 * [`Result::expect_err`]
5523 * [`Cell::into_inner`]
5529 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5530 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5531 * [`String` implements `FromIterator<&char>`][40028]
5532 * `Box` [implements][40009] a number of new conversions:
5533 `From<Box<str>> for String`,
5534 `From<Box<[T]>> for Vec<T>`,
5535 `From<Box<CStr>> for CString`,
5536 `From<Box<OsStr>> for OsString`,
5537 `From<Box<Path>> for PathBuf`,
5538 `Into<Box<str>> for String`,
5539 `Into<Box<[T]>> for Vec<T>`,
5540 `Into<Box<CStr>> for CString`,
5541 `Into<Box<OsStr>> for OsString`,
5542 `Into<Box<Path>> for PathBuf`,
5543 `Default for Box<str>`,
5544 `Default for Box<CStr>`,
5545 `Default for Box<OsStr>`,
5546 `From<&CStr> for Box<CStr>`,
5547 `From<&OsStr> for Box<OsStr>`,
5548 `From<&Path> for Box<Path>`
5549 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5550 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5551 * [Slightly optimize `slice::sort`][39538]
5552 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5553 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5554 `Box<str>` implements `From<&str>`][39438]
5555 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5556 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5557 * [`format!` estimates the needed capacity before writing a string][39356]
5558 * [Support unprivileged symlink creation in Windows][38921]
5559 * [`PathBuf` implements `Default`][38764]
5560 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5561 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5562 and poor hash functions.
5567 * [Add `cargo check --all`][cargo/3731]
5568 * [Add an option to ignore SSL revocation checking][cargo/3699]
5569 * [Add `cargo run --package`][cargo/3691]
5570 * [Add `required_features`][cargo/3667]
5571 * [Assume `build.rs` is a build script][cargo/3664]
5572 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5577 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5579 * [The "Unstable Book" documents nightly-only features][ubook]
5580 * [Improve the style of the sidebar in rustdoc output][40265]
5581 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5582 * [Fix MSP430 breakage due to `i128`][40257]
5583 * [Preliminary Solaris/SPARCv9 support][39903]
5584 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5585 run without installing the MSVC runtime.
5586 * [`rustdoc --test` includes file names in test names][39788]
5587 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5588 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5589 * [Initial support for `aarch64-unknown-freebsd`][39491]
5590 * [Initial support for `i686-unknown-netbsd`][39426]
5591 * [This release no longer includes the old makefile build system][39431]. Rust
5592 is built with a custom build system, written in Rust, and with Cargo.
5593 * [Add Debug implementations for libcollection structs][39002]
5594 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5595 * [`--test-threads=0` produces an error][38945]
5596 * [`rustup` installs documentation by default][40526]
5597 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5598 WinDbg and Visual Studio to improve the debugging experience.
5603 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5604 workaround, either use MSVC 2015 or run vcvars.bat.
5605 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5606 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5607 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5609 * [`format!` and `Display::to_string` panic if an underlying formatting
5610 implementation returns an error][40117]. Previously the error was silently
5611 ignored. It is incorrect for `write_fmt` to return an error when writing
5613 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5614 crates were marked stable and could be accessed from the stable toolchain.
5615 * [Rust git source no longer includes vendored crates][39728]. Those that need
5616 to build with vendored crates should build from release tarballs.
5617 * [Fix inert attributes from `proc_macro_derives`][39572]
5618 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5619 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5621 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5622 existing code generally ignores the type of dead-code unless a type-hint is
5623 provided; this can cause surprising inference interactions particularly around
5624 defaulting. The new code uniformly ignores the result type of dead-code.
5625 * [Tuple-struct constructors with private fields are no longer visible][38932]
5626 * [Lifetime parameters that do not appear in the arguments are now considered
5627 early-bound][38897], resolving a soundness bug (#[32330]). The
5628 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5630 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5631 * [Make transmuting from fn item types to pointer-sized types a hard
5634 [27787]: https://github.com/rust-lang/rust/issues/27787
5635 [32330]: https://github.com/rust-lang/rust/issues/32330
5636 [34198]: https://github.com/rust-lang/rust/pull/34198
5637 [38161]: https://github.com/rust-lang/rust/pull/38161
5638 [38368]: https://github.com/rust-lang/rust/pull/38368
5639 [38584]: https://github.com/rust-lang/rust/issues/38584
5640 [38661]: https://github.com/rust-lang/rust/pull/38661
5641 [38764]: https://github.com/rust-lang/rust/pull/38764
5642 [38864]: https://github.com/rust-lang/rust/issues/38864
5643 [38897]: https://github.com/rust-lang/rust/pull/38897
5644 [38921]: https://github.com/rust-lang/rust/pull/38921
5645 [38932]: https://github.com/rust-lang/rust/pull/38932
5646 [38945]: https://github.com/rust-lang/rust/pull/38945
5647 [38981]: https://github.com/rust-lang/rust/pull/38981
5648 [39002]: https://github.com/rust-lang/rust/pull/39002
5649 [39116]: https://github.com/rust-lang/rust/pull/39116
5650 [39193]: https://github.com/rust-lang/rust/pull/39193
5651 [39265]: https://github.com/rust-lang/rust/pull/39265
5652 [39356]: https://github.com/rust-lang/rust/pull/39356
5653 [39372]: https://github.com/rust-lang/rust/pull/39372
5654 [39426]: https://github.com/rust-lang/rust/pull/39426
5655 [39431]: https://github.com/rust-lang/rust/pull/39431
5656 [39438]: https://github.com/rust-lang/rust/pull/39438
5657 [39440]: https://github.com/rust-lang/rust/pull/39440
5658 [39485]: https://github.com/rust-lang/rust/pull/39485
5659 [39491]: https://github.com/rust-lang/rust/pull/39491
5660 [39518]: https://github.com/rust-lang/rust/pull/39518
5661 [39538]: https://github.com/rust-lang/rust/pull/39538
5662 [39572]: https://github.com/rust-lang/rust/pull/39572
5663 [39633]: https://github.com/rust-lang/rust/pull/39633
5664 [39642]: https://github.com/rust-lang/rust/pull/39642
5665 [39728]: https://github.com/rust-lang/rust/pull/39728
5666 [39761]: https://github.com/rust-lang/rust/pull/39761
5667 [39788]: https://github.com/rust-lang/rust/pull/39788
5668 [39793]: https://github.com/rust-lang/rust/pull/39793
5669 [39837]: https://github.com/rust-lang/rust/pull/39837
5670 [39843]: https://github.com/rust-lang/rust/pull/39843
5671 [39851]: https://github.com/rust-lang/rust/pull/39851
5672 [39903]: https://github.com/rust-lang/rust/pull/39903
5673 [39939]: https://github.com/rust-lang/rust/pull/39939
5674 [39953]: https://github.com/rust-lang/rust/pull/39953
5675 [39960]: https://github.com/rust-lang/rust/pull/39960
5676 [39990]: https://github.com/rust-lang/rust/pull/39990
5677 [39995]: https://github.com/rust-lang/rust/pull/39995
5678 [40008]: https://github.com/rust-lang/rust/pull/40008
5679 [40009]: https://github.com/rust-lang/rust/pull/40009
5680 [40027]: https://github.com/rust-lang/rust/pull/40027
5681 [40028]: https://github.com/rust-lang/rust/pull/40028
5682 [40037]: https://github.com/rust-lang/rust/pull/40037
5683 [40117]: https://github.com/rust-lang/rust/pull/40117
5684 [40166]: https://github.com/rust-lang/rust/pull/40166
5685 [40245]: https://github.com/rust-lang/rust/pull/40245
5686 [40257]: https://github.com/rust-lang/rust/pull/40257
5687 [40261]: https://github.com/rust-lang/rust/pull/40261
5688 [40265]: https://github.com/rust-lang/rust/pull/40265
5689 [40319]: https://github.com/rust-lang/rust/pull/40319
5690 [40336]: https://github.com/rust-lang/rust/pull/40336
5691 [40526]: https://github.com/rust-lang/rust/pull/40526
5692 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5693 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5694 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5695 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5696 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5697 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5698 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5699 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5700 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5701 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5702 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5703 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5704 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5705 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5706 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5707 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5708 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5709 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5710 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5711 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5712 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5713 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5714 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5715 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5716 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5717 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5718 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5719 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5720 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5721 [mdbook]: https://crates.io/crates/mdbook
5722 [ubook]: https://doc.rust-lang.org/unstable-book/
5725 Version 1.16.0 (2017-03-16)
5726 ===========================
5731 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5732 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5733 match patterns][38069]
5734 * [Clean up semantics of `self` in an import list][38313]
5735 * [`Self` may appear in `impl` headers][38920]
5736 * [`Self` may appear in struct expressions][39282]
5741 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5742 a `.rmeta` file containing only crate metadata][38571]. This can be
5743 used by tools like the Rust Language Service to perform
5744 metadata-only builds.
5745 * [Levenshtein based typo suggestions now work in most places, while
5746 previously they worked only for fields and sometimes for local
5747 variables][38927]. Together with the overhaul of "no
5748 resolution"/"unexpected resolution" errors (#[38154]) they result in
5749 large and systematic improvement in resolution diagnostics.
5750 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5752 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5753 * [`rustc` no longer attempts to provide "consider using an explicit
5754 lifetime" suggestions][37057]. They were inaccurate.
5759 * [`VecDeque::truncate`]
5760 * [`VecDeque::resize`]
5761 * [`String::insert_str`]
5762 * [`Duration::checked_add`]
5763 * [`Duration::checked_sub`]
5764 * [`Duration::checked_div`]
5765 * [`Duration::checked_mul`]
5768 * [`SocketAddr::is_ipv4`]
5769 * [`SocketAddr::is_ipv6`]
5770 * [`IpAddr::is_ipv4`]
5771 * [`IpAddr::is_ipv6`]
5773 * [`Vec::dedup_by_key`]
5774 * [`Result::unwrap_or_default`]
5775 * [`<*const T>::wrapping_offset`]
5776 * [`<*mut T>::wrapping_offset`]
5777 * `CommandExt::creation_flags`
5778 * [`File::set_permissions`]
5779 * [`String::split_off`]
5784 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5785 their argument by `Borrow` parameter][37761]
5786 * [All public types in std implement `Debug`][38006]
5787 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5788 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5789 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5791 * [std: Fix partial writes in `LineWriter`][38062]
5792 * [std: Clamp max read/write sizes on Unix][38062]
5793 * [Use more specific panic message for `&str` slicing errors][38066]
5794 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5795 functionality cannot be achieved in std currently.
5796 * [`writeln!`, like `println!`, now accepts a form with no string
5797 or formatting arguments, to just print a newline][38469]
5798 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5799 * [Reduce the size of static data in `std_unicode::tables`][38781]
5800 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5801 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5803 * [`Duration` implements `Sum`][38712]
5804 * [`String` implements `ToSocketAddrs`][39048]
5809 * [The `cargo check` command does a type check of a project without
5810 building it][cargo/3296]
5811 * [crates.io will display CI badges from Travis and AppVeyor, if
5812 specified in Cargo.toml][cargo/3546]
5813 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5814 * [Compilation profiles accept integer values for `debug`, in addition
5815 to `true` and `false`. These are passed to `rustc` as the value to
5816 `-C debuginfo`][cargo/3534]
5817 * [Implement `cargo --version --verbose`][cargo/3604]
5818 * [All builds now output 'dep-info' build dependencies compatible with
5819 make and ninja][cargo/3557]
5820 * [Build all workspace members with `build --all`][cargo/3511]
5821 * [Document all workspace members with `doc --all`][cargo/3515]
5822 * [Path deps outside workspace are not members][cargo/3443]
5827 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5828 the path to the Rust implementation][38589]
5829 * [The `armv7-linux-androideabi` target no longer enables NEON
5830 extensions, per Google's ABI guide][38413]
5831 * [The stock standard library can be compiled for Redox OS][38401]
5832 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5834 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5836 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5841 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5842 match patterns][38069]
5843 * In this release, references to uninhabited types can not be
5844 pattern-matched. This was accidentally allowed in 1.15.
5845 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5846 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5848 * [Clean up semantics of `self` in an import list][38313]
5849 * Reimplemented lifetime elision. This change was almost entirely compatible
5850 with existing code, but it did close a number of small bugs and loopholes,
5851 as well as being more accepting in some other [cases][41105].
5853 [37057]: https://github.com/rust-lang/rust/pull/37057
5854 [37761]: https://github.com/rust-lang/rust/pull/37761
5855 [38006]: https://github.com/rust-lang/rust/pull/38006
5856 [38051]: https://github.com/rust-lang/rust/pull/38051
5857 [38062]: https://github.com/rust-lang/rust/pull/38062
5858 [38062]: https://github.com/rust-lang/rust/pull/38622
5859 [38066]: https://github.com/rust-lang/rust/pull/38066
5860 [38069]: https://github.com/rust-lang/rust/pull/38069
5861 [38131]: https://github.com/rust-lang/rust/pull/38131
5862 [38154]: https://github.com/rust-lang/rust/pull/38154
5863 [38274]: https://github.com/rust-lang/rust/pull/38274
5864 [38304]: https://github.com/rust-lang/rust/pull/38304
5865 [38313]: https://github.com/rust-lang/rust/pull/38313
5866 [38314]: https://github.com/rust-lang/rust/pull/38314
5867 [38327]: https://github.com/rust-lang/rust/pull/38327
5868 [38401]: https://github.com/rust-lang/rust/pull/38401
5869 [38413]: https://github.com/rust-lang/rust/pull/38413
5870 [38469]: https://github.com/rust-lang/rust/pull/38469
5871 [38559]: https://github.com/rust-lang/rust/pull/38559
5872 [38571]: https://github.com/rust-lang/rust/pull/38571
5873 [38580]: https://github.com/rust-lang/rust/pull/38580
5874 [38589]: https://github.com/rust-lang/rust/pull/38589
5875 [38670]: https://github.com/rust-lang/rust/pull/38670
5876 [38712]: https://github.com/rust-lang/rust/pull/38712
5877 [38726]: https://github.com/rust-lang/rust/pull/38726
5878 [38781]: https://github.com/rust-lang/rust/pull/38781
5879 [38798]: https://github.com/rust-lang/rust/pull/38798
5880 [38909]: https://github.com/rust-lang/rust/pull/38909
5881 [38920]: https://github.com/rust-lang/rust/pull/38920
5882 [38927]: https://github.com/rust-lang/rust/pull/38927
5883 [39048]: https://github.com/rust-lang/rust/pull/39048
5884 [39282]: https://github.com/rust-lang/rust/pull/39282
5885 [39379]: https://github.com/rust-lang/rust/pull/39379
5886 [41105]: https://github.com/rust-lang/rust/issues/41105
5887 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5888 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5889 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5890 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5891 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5892 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5893 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5894 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5895 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5896 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5897 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5898 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5899 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5900 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5901 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5902 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5903 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5904 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5905 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5906 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5907 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5908 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5909 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5910 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5911 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5912 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5913 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5914 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5915 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5916 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5919 Version 1.15.1 (2017-02-09)
5920 ===========================
5922 * [Fix IntoIter::as_mut_slice's signature][39466]
5923 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5925 [39466]: https://github.com/rust-lang/rust/pull/39466
5926 [39523]: https://github.com/rust-lang/rust/pull/39523
5929 Version 1.15.0 (2017-02-02)
5930 ===========================
5935 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5936 stable. This allows popular code-generating crates like Serde and Diesel to
5937 work ergonomically. [RFC 1681].
5938 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5939 with curly braces][36868]. Part of [RFC 1506].
5940 * [A number of minor changes to name resolution have been activated][37127].
5941 They add up to more consistent semantics, allowing for future evolution of
5942 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5943 details of what is different. The breaking changes here have been transitioned
5944 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5945 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5947 * [`?Sized` can be used in `where` clauses][37791]
5948 * [There is now a limit on the size of monomorphized types and it can be
5949 modified with the `#![type_size_limit]` crate attribute, similarly to
5950 the `#![recursion_limit]` attribute][37789]
5955 * [On Windows, the compiler will apply dllimport attributes when linking to
5956 extern functions][37973]. Additional attributes and flags can control which
5957 library kind is linked and its name. [RFC 1717].
5958 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5959 * [The `--test` flag works with procedural macro crates][38107]
5960 * [Fix `extern "aapcs" fn` ABI][37814]
5961 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5962 * [The `format!` expander recognizes incorrect `printf` and shell-style
5963 formatting directives and suggests the correct format][37613].
5964 * [Only report one error for all unused imports in an import list][37456]
5966 Compiler Performance
5967 --------------------
5969 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5970 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5971 * [Don't clone in `UnificationTable::probe`][37848]
5972 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5973 * [Use small vectors in type walker][37760]
5974 * [Macro expansion performance was improved][37701]
5975 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5976 * [Replace FNV with a faster hash function][37229]
5981 * [`std::iter::Iterator::min_by`]
5982 * [`std::iter::Iterator::max_by`]
5983 * [`std::os::*::fs::FileExt`]
5984 * [`std::sync::atomic::Atomic*::get_mut`]
5985 * [`std::sync::atomic::Atomic*::into_inner`]
5986 * [`std::vec::IntoIter::as_slice`]
5987 * [`std::vec::IntoIter::as_mut_slice`]
5988 * [`std::sync::mpsc::Receiver::try_iter`]
5989 * [`std::os::unix::process::CommandExt::before_exec`]
5990 * [`std::rc::Rc::strong_count`]
5991 * [`std::rc::Rc::weak_count`]
5992 * [`std::sync::Arc::strong_count`]
5993 * [`std::sync::Arc::weak_count`]
5994 * [`std::char::encode_utf8`]
5995 * [`std::char::encode_utf16`]
5996 * [`std::cell::Ref::clone`]
5997 * [`std::io::Take::into_inner`]
6002 * [The standard sorting algorithm has been rewritten for dramatic performance
6003 improvements][38192]. It is a hybrid merge sort, drawing influences from
6004 Timsort. Previously it was a naive merge sort.
6005 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6006 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6008 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6009 and `char_indices().last()`][37882]
6010 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6011 * [Chinese characters display correctly in `fmt::Debug`][37855]
6012 * [Derive `Default` for `Duration`][37699]
6013 * [Support creation of anonymous pipes on WinXP/2k][37677]
6014 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6015 * [Don't pass overlapped handles to processes][38835]
6020 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6021 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6022 should instead check the variable at runtime with `std::env`. That the value
6023 was set at build time was a bug, and incorrect when cross-compiling. This
6024 change is known to cause breakage.
6025 * [Add `--all` flag to `cargo test`][cargo/3221]
6026 * [Compile statically against the MSVC CRT][cargo/3363]
6027 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6028 * [Link OpenSSL statically on OSX][cargo/3311]
6029 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6030 * [Test for bad path overrides with summaries][cargo/3336]
6031 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6032 * [Fix retrying crate downloads for network errors][cargo/3348]
6033 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6034 * [Emit more info on --message-format=json][cargo/3319]
6035 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6036 * [Don't ignore errors in workspace manifest][cargo/3409]
6037 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6042 * [Test runners (binaries built with `--test`) now support a `--list` argument
6043 that lists the tests it contains][38185]
6044 * [Test runners now support a `--exact` argument that makes the test filter
6045 match exactly, instead of matching only a substring of the test name][38181]
6046 * [rustdoc supports a `--playground-url` flag][37763]
6047 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6052 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6053 continue to be used in this release by passing `--disable-rustbuild` to the
6054 configure script, but they will be deleted soon. Note that the new build
6055 system uses a different on-disk layout that will likely affect any scripts
6057 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6059 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6060 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6066 * [A number of minor changes to name resolution have been activated][37127].
6067 They add up to more consistent semantics, allowing for future evolution of
6068 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6069 details of what is different. The breaking changes here have been transitioned
6070 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6071 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6072 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6073 should instead check the variable at runtime with `std::env`. That the value
6074 was set at build time was a bug, and incorrect when cross-compiling. This
6075 change is known to cause breakage.
6076 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6077 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6078 1.10 and is now an error by default. It will become a hard error in the near
6080 * [The semantics relating modules to file system directories are changing in
6081 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6082 lint, which is a warning in this release, and will become a hard error in the
6084 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6085 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6086 the underlying iterator][37834]
6088 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6089 [33685]: https://github.com/rust-lang/rust/issues/33685
6090 [36868]: https://github.com/rust-lang/rust/pull/36868
6091 [37127]: https://github.com/rust-lang/rust/pull/37127
6092 [37229]: https://github.com/rust-lang/rust/pull/37229
6093 [37456]: https://github.com/rust-lang/rust/pull/37456
6094 [37527]: https://github.com/rust-lang/rust/pull/37527
6095 [37602]: https://github.com/rust-lang/rust/pull/37602
6096 [37613]: https://github.com/rust-lang/rust/pull/37613
6097 [37615]: https://github.com/rust-lang/rust/pull/37615
6098 [37636]: https://github.com/rust-lang/rust/pull/37636
6099 [37627]: https://github.com/rust-lang/rust/pull/37627
6100 [37642]: https://github.com/rust-lang/rust/pull/37642
6101 [37677]: https://github.com/rust-lang/rust/pull/37677
6102 [37699]: https://github.com/rust-lang/rust/pull/37699
6103 [37701]: https://github.com/rust-lang/rust/pull/37701
6104 [37705]: https://github.com/rust-lang/rust/pull/37705
6105 [37749]: https://github.com/rust-lang/rust/pull/37749
6106 [37760]: https://github.com/rust-lang/rust/pull/37760
6107 [37763]: https://github.com/rust-lang/rust/pull/37763
6108 [37764]: https://github.com/rust-lang/rust/pull/37764
6109 [37789]: https://github.com/rust-lang/rust/pull/37789
6110 [37791]: https://github.com/rust-lang/rust/pull/37791
6111 [37814]: https://github.com/rust-lang/rust/pull/37814
6112 [37817]: https://github.com/rust-lang/rust/pull/37817
6113 [37834]: https://github.com/rust-lang/rust/pull/37834
6114 [37848]: https://github.com/rust-lang/rust/pull/37848
6115 [37855]: https://github.com/rust-lang/rust/pull/37855
6116 [37882]: https://github.com/rust-lang/rust/pull/37882
6117 [37888]: https://github.com/rust-lang/rust/pull/37888
6118 [37973]: https://github.com/rust-lang/rust/pull/37973
6119 [37979]: https://github.com/rust-lang/rust/pull/37979
6120 [38086]: https://github.com/rust-lang/rust/pull/38086
6121 [38107]: https://github.com/rust-lang/rust/pull/38107
6122 [38117]: https://github.com/rust-lang/rust/pull/38117
6123 [38134]: https://github.com/rust-lang/rust/pull/38134
6124 [38146]: https://github.com/rust-lang/rust/pull/38146
6125 [38181]: https://github.com/rust-lang/rust/pull/38181
6126 [38182]: https://github.com/rust-lang/rust/pull/38182
6127 [38185]: https://github.com/rust-lang/rust/pull/38185
6128 [38192]: https://github.com/rust-lang/rust/pull/38192
6129 [38279]: https://github.com/rust-lang/rust/pull/38279
6130 [38835]: https://github.com/rust-lang/rust/pull/38835
6131 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6132 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6133 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6134 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6135 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6136 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6137 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6138 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6139 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6140 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6141 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6142 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6143 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6144 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6145 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6146 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6147 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6148 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6149 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6150 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6151 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6152 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6153 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6154 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6155 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6156 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6157 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6158 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6159 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6160 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6161 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6162 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6163 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6164 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6165 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6166 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6167 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6168 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6171 Version 1.14.0 (2016-12-22)
6172 ===========================
6177 * [`..` matches multiple tuple fields in enum variants, structs
6178 and tuples][36843]. [RFC 1492].
6179 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6180 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6181 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6182 dereferencing][36822]
6187 * [Mark enums with non-zero discriminant as non-zero][37224]
6188 * [Lower-case `static mut` names are linted like other
6189 statics and consts][37162]
6190 * [Fix ICE on some macros in const integer positions
6191 (e.g. `[u8; m!()]`)][36819]
6192 * [Improve error message and snippet for "did you mean `x`"][36798]
6193 * [Add a panic-strategy field to the target specification][36794]
6194 * [Include LLVM version in `--version --verbose`][37200]
6196 Compile-time Optimizations
6197 --------------------------
6199 * [Improve macro expansion performance][37569]
6200 * [Shrink `Expr_::ExprInlineAsm`][37445]
6201 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6202 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6203 * [Avoid more allocations when compiling html5ever][37373]
6204 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6205 * [Avoid some allocations in the macro parser][37318]
6206 * [Use a faster deflate setting][37298]
6207 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6208 during interning of slices][37270]
6209 * [Optimize `write_metadata`][37267]
6210 * [Don't process obligation forest cycles when stalled][37231]
6211 * [Avoid many `CrateConfig` clones][37161]
6212 * [Optimize `Substs::super_fold_with`][37108]
6213 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6214 * [Speed up `plug_leaks`][36917]
6219 * [`println!()`, with no arguments, prints newline][36825].
6220 Previously, an empty string was required to achieve the same.
6221 * [`Wrapping` impls standard binary and unary operators, as well as
6222 the `Sum` and `Product` iterators][37356]
6223 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6225 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6226 `VecDeque` iterators][37315]
6227 * [Improve `SipHasher` performance on small values][37312]
6228 * [Add Iterator trait TrustedLen to enable better FromIterator /
6230 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6231 * [`ReadDir` implements `Debug`][37221]
6232 * [Implement `RefUnwindSafe` for atomic types][37178]
6233 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6234 * [Avoid allocations in `Decoder::read_str`][37064]
6235 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6236 * [Impl `Debug` for raw pointers to unsized data][36880]
6237 * [Don't reuse `HashMap` random seeds][37470]
6238 * [The internal memory layout of `HashMap` is more cache-friendly, for
6239 significant improvements in some operations][36692]
6240 * [`HashMap` uses less memory on 32-bit architectures][36595]
6241 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6246 * [Expose rustc cfg values to build scripts][cargo/3243]
6247 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6248 * [Fix passing --features when testing multiple packages][cargo/3280]
6249 * [Use a single profile set per workspace][cargo/3249]
6250 * [Load `replace` sections from lock files][cargo/3220]
6251 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6256 * [rustup is the recommended Rust installation method][1.14rustup]
6257 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6258 S390x. These are [tier 2] platforms and may have major defects. Follow the
6259 instructions on the website to install, or add the targets to an existing
6260 installation with `rustup target add`. The new target triples are:
6261 - `mips-unknown-linux-gnu`
6262 - `mipsel-unknown-linux-gnu`
6263 - `mips64-unknown-linux-gnuabi64`
6264 - `mips64el-unknown-linux-gnuabi64 `
6265 - `powerpc-unknown-linux-gnu`
6266 - `powerpc64-unknown-linux-gnu`
6267 - `powerpc64le-unknown-linux-gnu`
6268 - `s390x-unknown-linux-gnu `
6269 * This release includes target (std) builds for ARM Linux running MUSL
6270 libc. These are [tier 2] platforms and may have major defects. Add the
6271 following triples to an existing rustup installation with `rustup target add`:
6272 - `arm-unknown-linux-musleabi`
6273 - `arm-unknown-linux-musleabihf`
6274 - `armv7-unknown-linux-musleabihf`
6275 * This release includes [experimental support for WebAssembly][1.14wasm], via
6276 the `wasm32-unknown-emscripten` target. This target is known to have major
6277 defects. Please test, report, and fix.
6278 * rustup no longer installs documentation by default. Run `rustup
6279 component add rust-docs` to install.
6280 * [Fix line stepping in debugger][37310]
6281 * [Enable line number debuginfo in releases][37280]
6286 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6287 * [Add support for Fuchsia OS][37313]
6288 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6293 * [A number of forward-compatibility lints used by the compiler
6294 to gradually introduce language changes have been converted
6295 to deny by default][36894]:
6296 - ["use of inaccessible extern crate erroneously allowed"][36886]
6297 - ["type parameter default erroneously allowed in invalid location"][36887]
6298 - ["detects super or self keywords at the beginning of global path"][36888]
6299 - ["two overlapping inherent impls define an item with the same name
6300 were erroneously allowed"][36889]
6301 - ["floating-point constants cannot be used in patterns"][36890]
6302 - ["constants of struct or enum type can only be used in a pattern if
6303 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6304 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6305 * [Prohibit patterns in trait methods without bodies][37378]
6306 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6307 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6308 * [The `$crate` macro variable is accepted in fewer locations][37213]
6309 * [Impls specifying extra region requirements beyond the trait
6310 they implement are rejected][37167]
6311 * [Enums may not be unsized][37111]. Unsized enums are intended to
6312 work but never have. For now they are forbidden.
6313 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6315 [tier 2]: https://forge.rust-lang.org/platform-support.html
6316 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6317 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6318 [36430]: https://github.com/rust-lang/rust/pull/36430
6319 [36595]: https://github.com/rust-lang/rust/pull/36595
6320 [36595]: https://github.com/rust-lang/rust/pull/36595
6321 [36692]: https://github.com/rust-lang/rust/pull/36692
6322 [36767]: https://github.com/rust-lang/rust/pull/36767
6323 [36794]: https://github.com/rust-lang/rust/pull/36794
6324 [36798]: https://github.com/rust-lang/rust/pull/36798
6325 [36819]: https://github.com/rust-lang/rust/pull/36819
6326 [36822]: https://github.com/rust-lang/rust/pull/36822
6327 [36825]: https://github.com/rust-lang/rust/pull/36825
6328 [36843]: https://github.com/rust-lang/rust/pull/36843
6329 [36880]: https://github.com/rust-lang/rust/pull/36880
6330 [36886]: https://github.com/rust-lang/rust/issues/36886
6331 [36887]: https://github.com/rust-lang/rust/issues/36887
6332 [36888]: https://github.com/rust-lang/rust/issues/36888
6333 [36889]: https://github.com/rust-lang/rust/issues/36889
6334 [36890]: https://github.com/rust-lang/rust/issues/36890
6335 [36891]: https://github.com/rust-lang/rust/issues/36891
6336 [36892]: https://github.com/rust-lang/rust/issues/36892
6337 [36894]: https://github.com/rust-lang/rust/pull/36894
6338 [36917]: https://github.com/rust-lang/rust/pull/36917
6339 [36993]: https://github.com/rust-lang/rust/pull/36993
6340 [37037]: https://github.com/rust-lang/rust/pull/37037
6341 [37064]: https://github.com/rust-lang/rust/pull/37064
6342 [37094]: https://github.com/rust-lang/rust/pull/37094
6343 [37108]: https://github.com/rust-lang/rust/pull/37108
6344 [37111]: https://github.com/rust-lang/rust/pull/37111
6345 [37161]: https://github.com/rust-lang/rust/pull/37161
6346 [37162]: https://github.com/rust-lang/rust/pull/37162
6347 [37167]: https://github.com/rust-lang/rust/pull/37167
6348 [37178]: https://github.com/rust-lang/rust/pull/37178
6349 [37200]: https://github.com/rust-lang/rust/pull/37200
6350 [37213]: https://github.com/rust-lang/rust/pull/37213
6351 [37221]: https://github.com/rust-lang/rust/pull/37221
6352 [37224]: https://github.com/rust-lang/rust/pull/37224
6353 [37230]: https://github.com/rust-lang/rust/pull/37230
6354 [37231]: https://github.com/rust-lang/rust/pull/37231
6355 [37247]: https://github.com/rust-lang/rust/pull/37247
6356 [37267]: https://github.com/rust-lang/rust/pull/37267
6357 [37270]: https://github.com/rust-lang/rust/pull/37270
6358 [37273]: https://github.com/rust-lang/rust/pull/37273
6359 [37280]: https://github.com/rust-lang/rust/pull/37280
6360 [37298]: https://github.com/rust-lang/rust/pull/37298
6361 [37306]: https://github.com/rust-lang/rust/pull/37306
6362 [37310]: https://github.com/rust-lang/rust/pull/37310
6363 [37312]: https://github.com/rust-lang/rust/pull/37312
6364 [37313]: https://github.com/rust-lang/rust/pull/37313
6365 [37315]: https://github.com/rust-lang/rust/pull/37315
6366 [37318]: https://github.com/rust-lang/rust/pull/37318
6367 [37322]: https://github.com/rust-lang/rust/pull/37322
6368 [37326]: https://github.com/rust-lang/rust/pull/37326
6369 [37351]: https://github.com/rust-lang/rust/pull/37351
6370 [37356]: https://github.com/rust-lang/rust/pull/37356
6371 [37367]: https://github.com/rust-lang/rust/pull/37367
6372 [37373]: https://github.com/rust-lang/rust/pull/37373
6373 [37378]: https://github.com/rust-lang/rust/pull/37378
6374 [37389]: https://github.com/rust-lang/rust/pull/37389
6375 [37392]: https://github.com/rust-lang/rust/pull/37392
6376 [37427]: https://github.com/rust-lang/rust/pull/37427
6377 [37439]: https://github.com/rust-lang/rust/pull/37439
6378 [37445]: https://github.com/rust-lang/rust/pull/37445
6379 [37470]: https://github.com/rust-lang/rust/pull/37470
6380 [37569]: https://github.com/rust-lang/rust/pull/37569
6381 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6382 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6383 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6384 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6385 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6386 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6387 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6390 Version 1.13.0 (2016-11-10)
6391 ===========================
6396 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6397 errors, like the `try!` macro, described in [RFC 0243].
6398 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6399 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6400 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6401 * [Fix lifetime rules for 'if' conditions][36029]
6402 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6407 * [Add the `-C link-arg` argument][36574]
6408 * [Remove the old AST-based backend from rustc_trans][35764]
6409 * [Don't enable NEON by default on armv7 Linux][35814]
6410 * [Fix debug line number info for macro expansions][35238]
6411 * [Do not emit "class method" debuginfo for types that are not
6412 DICompositeType][36008]
6413 * [Warn about multiple conflicting #[repr] hints][34623]
6414 * [When sizing DST, don't double-count nested struct prefixes][36351]
6415 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6416 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6417 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6418 * [Expand macros without recursing to avoid stack overflows][36214]
6423 * [Replace macro backtraces with labeled local uses][35702]
6424 * [Improve error message for misplaced doc comments][33922]
6425 * [Buffer unix and lock windows to prevent message interleaving][35975]
6426 * [Update lifetime errors to specifically note temporaries][36171]
6427 * [Special case a few colors for Windows][36178]
6428 * [Suggest `use self` when such an import resolves][36289]
6429 * [Be more specific when type parameter shadows primitive type][36338]
6430 * Many minor improvements
6432 Compile-time Optimizations
6433 --------------------------
6435 * [Compute and cache HIR hashes at beginning][35854]
6436 * [Don't hash types in loan paths][36004]
6437 * [Cache projections in trans][35761]
6438 * [Optimize the parser's last token handling][36527]
6439 * [Only instantiate #[inline] functions in codegen units referencing
6440 them][36524]. This leads to big improvements in cases where crates export
6441 define many inline functions without using them directly.
6442 * [Lazily allocate TypedArena's first chunk][36592]
6443 * [Don't allocate during default HashSet creation][36734]
6450 * [`overflowing_abs`]
6451 * [`RefCell::try_borrow`]
6452 * [`RefCell::try_borrow_mut`]
6457 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6458 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6460 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6461 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6462 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6463 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6464 * [Use arc4rand on FreeBSD][35884]
6465 * [memrchr: Correct aligned offset computation][35969]
6466 * [Improve Demangling of Rust Symbols][36059]
6467 * [Use monotonic time in condition variables][35048]
6468 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6469 * [Implement conversion traits for `char`][35755]
6470 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6471 * [Zero first byte of CString on drop][36264]
6472 * [Inherit overflow checks for sum and product][36372]
6473 * [Add missing Eq implementations][36423]
6474 * [Implement `Debug` for `DirEntry`][36631]
6475 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6477 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6478 * [Implement more traits for `std::io::ErrorKind`][35911]
6479 * [Optimize BinaryHeap bounds checking][36072]
6480 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6481 `extend_with_element`][36355]
6482 * [Fix overflow checking in unsigned pow()][34942]
6487 * This release includes security fixes to both curl and OpenSSL.
6488 * [Fix transitive doctests when panic=abort][cargo/3021]
6489 * [Add --all-features flag to cargo][cargo/3038]
6490 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6491 * [Don't parse the home directory more than once][cargo/3078]
6492 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6493 * [Update OpenSSL to 1.0.2j][cargo/3121]
6494 * [Add license and license_file to cargo metadata output][cargo/3110]
6495 * [Make crates-io registry URL optional in config; ignore all changes to
6496 source.crates-io][cargo/3089]
6497 * [Don't download dependencies from other platforms][cargo/3123]
6498 * [Build transitive dev-dependencies when needed][cargo/3125]
6499 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6500 * [Avoid updating registry when adding existing deps][cargo/3144]
6501 * [Warn about path overrides that won't work][cargo/3136]
6502 * [Use workspaces during `cargo install`][cargo/3146]
6503 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6504 * [Add --message-format flag][cargo/3000]
6505 * [Pass target environment for rustdoc][cargo/3205]
6506 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6507 * [Update curl and curl-sys][cargo/3241]
6508 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6513 * [rustdoc: Add the `--sysroot` argument][36586]
6514 * [rustdoc: Fix a couple of issues with the search results][35655]
6515 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6516 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6517 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6522 * [Remove unmaintained style guide][35124]
6523 * [Add s390x support][36369]
6524 * [Initial work at Haiku OS support][36727]
6525 * [Add mips-uclibc targets][35734]
6526 * [Crate-ify compiler-rt into compiler-builtins][35021]
6527 * [Add rustc version info (git hash + date) to dist tarball][36213]
6528 * Many documentation improvements
6533 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6534 * [Deny (by default) transmuting from fn item types to pointer-sized
6535 types][34923]. Continuing the long transition to zero-sized fn items,
6537 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6539 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6540 * [Fix lifetime rules for 'if' conditions][36029].
6541 * [Inherit overflow checks for sum and product][36372].
6542 * [Forbid user-defined macros named "macro_rules"][36730].
6544 [33922]: https://github.com/rust-lang/rust/pull/33922
6545 [34623]: https://github.com/rust-lang/rust/pull/34623
6546 [34923]: https://github.com/rust-lang/rust/pull/34923
6547 [34942]: https://github.com/rust-lang/rust/pull/34942
6548 [34982]: https://github.com/rust-lang/rust/pull/34982
6549 [35021]: https://github.com/rust-lang/rust/pull/35021
6550 [35048]: https://github.com/rust-lang/rust/pull/35048
6551 [35074]: https://github.com/rust-lang/rust/pull/35074
6552 [35124]: https://github.com/rust-lang/rust/pull/35124
6553 [35234]: https://github.com/rust-lang/rust/pull/35234
6554 [35238]: https://github.com/rust-lang/rust/pull/35238
6555 [35354]: https://github.com/rust-lang/rust/pull/35354
6556 [35559]: https://github.com/rust-lang/rust/pull/35559
6557 [35585]: https://github.com/rust-lang/rust/pull/35585
6558 [35627]: https://github.com/rust-lang/rust/pull/35627
6559 [35655]: https://github.com/rust-lang/rust/pull/35655
6560 [35702]: https://github.com/rust-lang/rust/pull/35702
6561 [35707]: https://github.com/rust-lang/rust/pull/35707
6562 [35728]: https://github.com/rust-lang/rust/pull/35728
6563 [35734]: https://github.com/rust-lang/rust/pull/35734
6564 [35755]: https://github.com/rust-lang/rust/pull/35755
6565 [35761]: https://github.com/rust-lang/rust/pull/35761
6566 [35764]: https://github.com/rust-lang/rust/pull/35764
6567 [35814]: https://github.com/rust-lang/rust/pull/35814
6568 [35854]: https://github.com/rust-lang/rust/pull/35854
6569 [35871]: https://github.com/rust-lang/rust/pull/35871
6570 [35884]: https://github.com/rust-lang/rust/pull/35884
6571 [35911]: https://github.com/rust-lang/rust/pull/35911
6572 [35969]: https://github.com/rust-lang/rust/pull/35969
6573 [35975]: https://github.com/rust-lang/rust/pull/35975
6574 [36004]: https://github.com/rust-lang/rust/pull/36004
6575 [36008]: https://github.com/rust-lang/rust/pull/36008
6576 [36014]: https://github.com/rust-lang/rust/pull/36014
6577 [36029]: https://github.com/rust-lang/rust/pull/36029
6578 [36059]: https://github.com/rust-lang/rust/pull/36059
6579 [36072]: https://github.com/rust-lang/rust/pull/36072
6580 [36101]: https://github.com/rust-lang/rust/pull/36101
6581 [36104]: https://github.com/rust-lang/rust/pull/36104
6582 [36171]: https://github.com/rust-lang/rust/pull/36171
6583 [36173]: https://github.com/rust-lang/rust/pull/36173
6584 [36178]: https://github.com/rust-lang/rust/pull/36178
6585 [36213]: https://github.com/rust-lang/rust/pull/36213
6586 [36214]: https://github.com/rust-lang/rust/pull/36214
6587 [36264]: https://github.com/rust-lang/rust/pull/36264
6588 [36266]: https://github.com/rust-lang/rust/pull/36266
6589 [36289]: https://github.com/rust-lang/rust/pull/36289
6590 [36338]: https://github.com/rust-lang/rust/pull/36338
6591 [36351]: https://github.com/rust-lang/rust/pull/36351
6592 [36355]: https://github.com/rust-lang/rust/pull/36355
6593 [36369]: https://github.com/rust-lang/rust/pull/36369
6594 [36372]: https://github.com/rust-lang/rust/pull/36372
6595 [36423]: https://github.com/rust-lang/rust/pull/36423
6596 [36482]: https://github.com/rust-lang/rust/pull/36482
6597 [36505]: https://github.com/rust-lang/rust/pull/36505
6598 [36524]: https://github.com/rust-lang/rust/pull/36524
6599 [36527]: https://github.com/rust-lang/rust/pull/36527
6600 [36551]: https://github.com/rust-lang/rust/pull/36551
6601 [36574]: https://github.com/rust-lang/rust/pull/36574
6602 [36586]: https://github.com/rust-lang/rust/pull/36586
6603 [36592]: https://github.com/rust-lang/rust/pull/36592
6604 [36631]: https://github.com/rust-lang/rust/pull/36631
6605 [36639]: https://github.com/rust-lang/rust/pull/36639
6606 [36721]: https://github.com/rust-lang/rust/pull/36721
6607 [36727]: https://github.com/rust-lang/rust/pull/36727
6608 [36730]: https://github.com/rust-lang/rust/pull/36730
6609 [36734]: https://github.com/rust-lang/rust/pull/36734
6610 [36754]: https://github.com/rust-lang/rust/pull/36754
6611 [36995]: https://github.com/rust-lang/rust/pull/36995
6612 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6613 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6614 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6615 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6616 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6617 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6618 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6619 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6620 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6621 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6622 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6623 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6624 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6625 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6626 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6627 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6628 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6629 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6630 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6631 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6632 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6633 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6634 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6635 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6636 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6637 [rustup]: https://www.rustup.rs
6638 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6639 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6640 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6641 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6642 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6643 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6644 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6647 Version 1.12.1 (2016-10-20)
6648 ===========================
6653 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6654 * [Confusion with double negation and booleans][36856]
6655 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6656 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6657 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6658 * [Corrupted memory after updated to 1.12][36936]
6659 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6660 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6661 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6663 [36381]: https://github.com/rust-lang/rust/issues/36381
6664 [36856]: https://github.com/rust-lang/rust/issues/36856
6665 [36875]: https://github.com/rust-lang/rust/issues/36875
6666 [36924]: https://github.com/rust-lang/rust/issues/36924
6667 [36926]: https://github.com/rust-lang/rust/issues/36926
6668 [36936]: https://github.com/rust-lang/rust/issues/36936
6669 [37026]: https://github.com/rust-lang/rust/issues/37026
6670 [37112]: https://github.com/rust-lang/rust/issues/37112
6671 [37153]: https://github.com/rust-lang/rust/issues/37153
6674 Version 1.12.0 (2016-09-29)
6675 ===========================
6680 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6681 This translation pass is far simpler than the previous AST->LLVM pass, and
6682 creates opportunities to perform new optimizations directly on the MIR. It
6683 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6684 * [`rustc` presents a new, more readable error format, along with
6685 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6686 Most common editors supporting Rust have been updated to work with it. It was
6687 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6692 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6693 This translation pass is far simpler than the previous AST->LLVM pass, and
6694 creates opportunities to perform new optimizations directly on the MIR. It
6695 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6696 * [Print the Rust target name, not the LLVM target name, with
6697 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6698 * [The computation of `TypeId` is correct in some cases where it was previously
6699 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6700 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6701 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6702 `--print relocation-models`, and `--print code-models` print the available
6703 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6704 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6705 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6706 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6707 These targets produce statically-linked binaries. There are no binary release
6713 * [`rustc` presents a new, more readable error format, along with
6714 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6715 Most common editors supporting Rust have been updated to work with it. It was
6716 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6717 * [In error descriptions, references are now described in plain English,
6718 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6719 * [In error type descriptions, unknown numeric types are named `{integer}` or
6720 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6721 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6726 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6727 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6728 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6729 useful](https://github.com/rust-lang/rust/pull/34908)
6730 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6731 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6732 * [Semicolons are properly required as statement delimiters inside
6733 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6734 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6739 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6740 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6741 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6742 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6743 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6744 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6745 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6746 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6747 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6748 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6749 Both on Unix and Windows.
6750 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6751 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6752 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6753 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6754 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6755 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6756 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6757 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6762 * [The `format!` macro and friends now allow a single argument to be formatted
6763 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6764 * [The lifetime bounds on `[T]::binary_search_by` and
6765 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6766 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6767 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6768 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6769 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6770 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6771 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6772 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6773 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6774 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6775 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6776 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6777 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6778 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6779 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6780 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6781 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6782 * [`mpsc::sync_channel` `Receiver`s return any available message before
6783 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6784 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6785 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6790 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6791 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6792 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6793 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6794 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6795 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6796 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6797 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6798 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6799 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6800 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6801 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6802 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6803 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6804 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6805 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6810 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6811 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6816 * [Test binaries now support a `--test-threads` argument to specify the number
6817 of threads used to run tests, and which acts the same as the
6818 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6819 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6820 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6821 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6822 * [Rust releases now come with source packages that can be installed by rustup
6823 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6824 The resulting source code can be used by tools and IDES, located in the
6825 sysroot under `lib/rustlib/src`.
6830 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6831 * Many minor improvements to the documentation.
6832 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6837 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6838 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6839 * [When formatting strings, if "precision" is specified, the "fill",
6840 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6841 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6844 Version 1.11.0 (2016-08-18)
6845 ===========================
6850 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6851 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6852 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6853 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6858 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6859 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6860 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6861 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6862 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6863 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6864 (in libcore - previously stabilized in libstd)
6865 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6866 (in libcore - previously stabilized in libstd)
6867 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6868 (in libcore - previously stabilized in libstd)
6869 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6870 (in libcore - previously stabilized in libstd)
6871 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6872 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6873 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6874 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6879 * [The `thread_local!` macro supports multiple definitions in a single
6880 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6881 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6882 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6883 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6884 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6885 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6886 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6887 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6892 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6893 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6894 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6895 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6896 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6897 and `-vv` prints warnings for all crates.
6898 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6899 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6900 This provides room for expansion by arbitrary tools.
6901 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6902 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6903 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6904 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6905 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6906 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6907 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6912 * [Caching projections speeds up type check dramatically for some
6913 workloads](https://github.com/rust-lang/rust/pull/33816)
6914 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6915 This hasher is faster, but is believed to provide sufficient
6916 protection from collision attacks.
6917 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6922 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6923 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6924 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6925 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6926 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6931 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6932 * [When emitting debug info, rustc emits frame pointers for closures,
6933 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6934 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6935 * Many more errors have been given error codes and extended
6937 * API documentation continues to be improved, with many new examples
6942 * [rustc no longer hangs when dependencies recursively re-export
6943 submodules](https://github.com/rust-lang/rust/pull/34542)
6944 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6945 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6946 rewritten](https://github.com/rust-lang/rust/pull/33895)
6947 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6948 No targets use this yet, but it works toward AVR support.
6953 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6954 * [The new follow-set rules that place restrictions on `macro_rules!`
6955 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6956 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6957 and has been a warning since 1.10.
6958 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6959 This causes breakage in some corner cases.
6962 Version 1.10.0 (2016-07-07)
6963 ===========================
6968 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6969 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6970 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6971 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6972 * [`panic!` can be converted to a runtime abort with the
6973 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6974 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6975 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6976 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6977 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6978 Note that Cargo does not yet directly support cdylibs.
6983 * `os::windows::fs::OpenOptionsExt::access_mode`
6984 * `os::windows::fs::OpenOptionsExt::share_mode`
6985 * `os::windows::fs::OpenOptionsExt::custom_flags`
6986 * `os::windows::fs::OpenOptionsExt::attributes`
6987 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6988 * `os::unix::fs::OpenOptionsExt::custom_flags`
6989 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6990 * `Default for sync::Weak`
6991 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6992 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6993 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6994 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6995 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6996 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6997 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6998 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6999 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7000 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7001 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7002 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7003 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7004 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7005 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7006 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7007 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7008 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7009 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7010 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7011 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7012 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7013 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7014 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7015 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7016 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7017 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7018 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7019 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7020 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7021 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7022 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7023 * Read/Write/RawFd impls for `UnixStream`
7024 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7025 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7026 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7027 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7028 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7029 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7030 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7031 * RawFd impls for `UnixListener`
7032 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7033 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7034 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7035 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7036 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7037 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7038 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7039 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7040 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7041 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7042 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7043 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7044 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7045 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7046 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7047 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7048 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7049 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7050 * RawFd impls for `UnixDatagram`
7051 * `{BTree,Hash}Map::values_mut`
7052 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7057 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7058 The semantics of this minor method are subtle and probably not what
7060 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7061 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7062 will fall back to `/dev/urandom` temporarily to avoid blocking
7063 during early boot](https://github.com/rust-lang/rust/pull/33086).
7064 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7065 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7066 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7067 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7068 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7069 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7070 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7074 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7075 This controls the runtime behavior of the `panic!` macro
7076 and can be either "unwind" (the default), or "abort".
7077 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7078 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7079 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7080 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7081 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7082 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7083 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7084 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7085 By default they are retried twice, which can be customized with the
7086 `net.retry` value in `.cargo/config`.
7087 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7088 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7089 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7090 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7091 Makes it possible to install multiple crates in parallel.
7092 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7093 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7094 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7095 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7096 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7097 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7102 * [rustc memory usage was reduced by refactoring the context used for
7103 type checking](https://github.com/rust-lang/rust/pull/33425).
7104 * [Speed up creation of `HashMap`s by caching the random keys used
7105 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7106 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7107 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7108 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7109 10x faster than the previous lookup tables.
7110 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7115 * Many incremental improvements to documentation and rustdoc.
7116 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7117 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7118 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7119 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7120 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7121 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7122 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7127 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7128 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7129 * [`std` no longer prints backtraces on platforms where the running
7130 module must be loaded with `env::current_exe`, which can't be relied
7131 on](https://github.com/rust-lang/rust/pull/33554).
7132 * This release includes std binaries for the i586-unknown-linux-gnu,
7133 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7134 i586 target is for old x86 hardware without SSE2, and the armv7
7135 target is for Android running on modern ARM architectures.
7136 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7137 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7138 * [On Unix the runtime aborts by calling `libc::abort` instead of
7139 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7140 * [Rust is now bootstrapped from the previous release of Rust,
7141 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7146 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7147 * [`target_env` for Linux ARM targets is just `gnu`, not
7148 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7149 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7150 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7151 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7152 Affects how macros are parsed.
7153 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7154 * [Feature-gated attributes on macro-generated macro invocations are
7155 now rejected](https://github.com/rust-lang/rust/pull/32791).
7156 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7157 This caused some minor changes to type inference.
7160 Version 1.9.0 (2016-05-26)
7161 ==========================
7166 * The `#[deprecated]` attribute when applied to an API will generate
7167 warnings when used. The warnings may be suppressed with
7168 `#[allow(deprecated)]`. [RFC 1270].
7169 * [`fn` item types are zero sized, and each `fn` names a unique
7170 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7171 `transmute` on a `fn` type will generate a warning for a few cycles,
7172 then will be converted to an error.
7173 * [Field and method resolution understand visibility, so private
7174 fields and methods cannot prevent the proper use of public fields
7175 and methods][1.9fv].
7176 * [The parser considers unicode codepoints in the
7177 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7183 * [`std::panic::catch_unwind`] (renamed from `recover`)
7184 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7185 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7186 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7187 * [`str::is_char_boundary`]
7188 * [`<*const T>::as_ref`]
7189 * [`<*mut T>::as_ref`]
7190 * [`<*mut T>::as_mut`]
7191 * [`AsciiExt::make_ascii_uppercase`]
7192 * [`AsciiExt::make_ascii_lowercase`]
7193 * [`char::decode_utf16`]
7194 * [`char::DecodeUtf16`]
7195 * [`char::DecodeUtf16Error`]
7196 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7197 * [`BTreeSet::take`]
7198 * [`BTreeSet::replace`]
7201 * [`HashSet::replace`]
7203 * [`OsString::with_capacity`]
7204 * [`OsString::clear`]
7205 * [`OsString::capacity`]
7206 * [`OsString::reserve`]
7207 * [`OsString::reserve_exact`]
7208 * [`OsStr::is_empty`]
7210 * [`std::os::unix::thread`]
7213 * [`JoinHandleExt::as_pthread_t`]
7214 * [`JoinHandleExt::into_pthread_t`]
7215 * [`HashSet::hasher`]
7216 * [`HashMap::hasher`]
7217 * [`CommandExt::exec`]
7218 * [`File::try_clone`]
7219 * [`SocketAddr::set_ip`]
7220 * [`SocketAddr::set_port`]
7221 * [`SocketAddrV4::set_ip`]
7222 * [`SocketAddrV4::set_port`]
7223 * [`SocketAddrV6::set_ip`]
7224 * [`SocketAddrV6::set_port`]
7225 * [`SocketAddrV6::set_flowinfo`]
7226 * [`SocketAddrV6::set_scope_id`]
7227 * [`slice::copy_from_slice`]
7228 * [`ptr::read_volatile`]
7229 * [`ptr::write_volatile`]
7230 * [`OpenOptions::create_new`]
7231 * [`TcpStream::set_nodelay`]
7232 * [`TcpStream::nodelay`]
7233 * [`TcpStream::set_ttl`]
7234 * [`TcpStream::ttl`]
7235 * [`TcpStream::set_only_v6`]
7236 * [`TcpStream::only_v6`]
7237 * [`TcpStream::take_error`]
7238 * [`TcpStream::set_nonblocking`]
7239 * [`TcpListener::set_ttl`]
7240 * [`TcpListener::ttl`]
7241 * [`TcpListener::set_only_v6`]
7242 * [`TcpListener::only_v6`]
7243 * [`TcpListener::take_error`]
7244 * [`TcpListener::set_nonblocking`]
7245 * [`UdpSocket::set_broadcast`]
7246 * [`UdpSocket::broadcast`]
7247 * [`UdpSocket::set_multicast_loop_v4`]
7248 * [`UdpSocket::multicast_loop_v4`]
7249 * [`UdpSocket::set_multicast_ttl_v4`]
7250 * [`UdpSocket::multicast_ttl_v4`]
7251 * [`UdpSocket::set_multicast_loop_v6`]
7252 * [`UdpSocket::multicast_loop_v6`]
7253 * [`UdpSocket::set_multicast_ttl_v6`]
7254 * [`UdpSocket::multicast_ttl_v6`]
7255 * [`UdpSocket::set_ttl`]
7256 * [`UdpSocket::ttl`]
7257 * [`UdpSocket::set_only_v6`]
7258 * [`UdpSocket::only_v6`]
7259 * [`UdpSocket::join_multicast_v4`]
7260 * [`UdpSocket::join_multicast_v6`]
7261 * [`UdpSocket::leave_multicast_v4`]
7262 * [`UdpSocket::leave_multicast_v6`]
7263 * [`UdpSocket::take_error`]
7264 * [`UdpSocket::connect`]
7265 * [`UdpSocket::send`]
7266 * [`UdpSocket::recv`]
7267 * [`UdpSocket::set_nonblocking`]
7272 * [`std::sync::Once` is poisoned if its initialization function
7274 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7275 * [Most types implement `fmt::Debug`][1.9db].
7276 * [The default buffer size used by `BufReader` and `BufWriter` was
7277 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7278 used by other languages.
7279 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7280 `Duration` additionally implements `*=` and `/=`][1.9ta].
7281 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7282 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7283 * [`Chain` implements `BufRead`][1.9ch].
7284 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7289 * [Cargo can now run concurrently][1.9cc].
7290 * [Top-level overrides allow specific revisions of crates to be
7291 overridden through the entire crate graph][1.9ct]. This is intended
7292 to make upgrades easier for large projects, by allowing crates to be
7293 forked temporarily until they've been upgraded and republished.
7294 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7295 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7296 on the commandline][1.9cf]. `rustc` arguments can also be specified
7297 in the `build.rustflags` configuration key.
7302 * [The time complexity of comparing variables for equivalence during type
7303 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7304 to major compilation time improvement in some scenarios.
7305 * [`ToString` is specialized for `str`, giving it the same performance
7306 as `to_owned`][1.9ts].
7307 * [Spawning processes with `Command::output` no longer creates extra
7309 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7310 for C-like enums][1.9cl].
7315 * [Passing the `--quiet` flag to a test runner will produce
7316 much-abbreviated output][1.9q].
7317 * The Rust Project now publishes std binaries for the
7318 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7319 `i586-pc-windows-msvc` targets.
7324 * [`std::sync::Once` is poisoned if its initialization function
7326 * [It is illegal to define methods with the same name in overlapping
7327 inherent `impl` blocks][1.9sn].
7328 * [`fn` item types are zero sized, and each `fn` names a unique
7329 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7330 `transmute` on a `fn` type will generate a warning for a few cycles,
7331 then will be converted to an error.
7332 * [Improvements to const evaluation may trigger new errors when integer
7333 literals are out of range][1.9ce].
7336 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7337 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7338 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7339 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7340 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7341 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7342 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7343 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7344 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7345 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7346 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7347 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7348 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7349 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7350 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7351 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7352 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7353 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7354 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7355 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7356 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7357 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7358 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7359 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7360 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7361 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7362 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7363 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7364 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7365 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7366 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7367 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7368 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7369 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7370 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7371 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7372 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7373 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7374 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7375 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7376 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7377 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7378 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7379 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7380 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7381 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7382 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7383 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7384 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7385 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7386 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7387 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7388 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7389 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7390 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7391 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7392 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7393 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7394 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7395 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7396 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7397 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7398 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7399 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7400 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7401 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7402 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7403 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7404 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7405 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7406 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7407 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7408 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7409 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7410 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7411 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7412 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7413 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7414 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7415 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7416 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7417 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7418 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7419 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7420 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7421 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7422 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7423 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7424 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7425 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7426 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7427 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7428 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7429 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7430 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7431 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7432 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7433 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7434 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7435 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7436 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7437 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7438 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7439 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7440 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7441 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7442 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7443 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7444 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7445 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7448 Version 1.8.0 (2016-04-14)
7449 ==========================
7454 * Rust supports overloading of compound assignment statements like
7455 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7456 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7457 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7459 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7460 addition to the non-braced form, `struct Foo;`. [RFC 218].
7466 * [`str::encode_utf16`] (renamed from `utf16_units`)
7467 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7470 * [`ptr::drop_in_place`]
7472 * [`time::SystemTime`]
7474 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7475 * [`Instant::elapsed`]
7476 * [`SystemTime::now`]
7477 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7478 * [`SystemTime::elapsed`]
7479 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7480 * [`SystemTimeError`]
7481 * [`SystemTimeError::duration`]
7482 * Various impls for `SystemTimeError`
7484 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7485 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7486 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7487 * [The `write!` and `writeln!` macros correctly emit errors if any of
7488 their arguments can't be formatted][1.8w].
7489 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7490 * [The Unix-specific `raw` modules, which contain a number of
7491 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7492 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7493 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7494 across platforms was making it difficult to implement `std`
7495 correctly. Those that need these definitions should use the `libc`
7497 * The Unix-specific `MetadataExt` traits, including
7498 `os::unix::fs::MetadataExt`, which expose values such as inode
7499 numbers [no longer return platform-specific types][1.8r], but
7500 instead return widened integers. [RFC 1415].
7501 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7502 * [Atomic loads and stores are not volatile][1.8a].
7503 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7508 * [Inlining hash functions lead to a 3% compile-time improvement in
7509 some workloads][1.8h].
7510 * When using jemalloc, its symbols are [unprefixed so that it
7511 overrides the libc malloc implementation][1.8h]. This means that for
7512 rustc, LLVM is now using jemalloc, which results in a 6%
7513 compile-time improvement on a specific workload.
7514 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7519 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7520 i686-pc-windows-msvc is now considered a tier-1 platform.
7521 * [The `--print targets` flag prints a list of supported targets][1.8t].
7522 * [The `--print cfg` flag prints the `cfg`s defined for the current
7524 * [`rustc` can be built with an new Cargo-based build system, written
7525 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7526 build system. To enable it configure with `configure --rustbuild`.
7527 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7528 variants while also indicating the total number of missing variants
7529 if more than 3][1.8m].
7530 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7531 * The Rust Project now publishes binary releases of the standard
7532 library for a number of tier-2 targets:
7533 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7534 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7535 `x86_64-rumprun-netbsd`. These can be installed with
7536 tools such as [multirust][1.8mr].
7541 * [`cargo init` creates a new Cargo project in the current
7542 directory][1.8ci]. It is otherwise like `cargo new`.
7543 * [Cargo has configuration keys for `-v` and
7544 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7545 `[term]` section of `.cargo/config`.
7546 * [Configuration keys that evaluate to strings or integers can be set
7547 via environment variables][1.8ce]. For example the `build.jobs` key
7548 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7549 precedence over config files.
7550 * [Target-specific dependencies support Rust `cfg` syntax for
7551 describing targets][1.8cfg] so that dependencies for multiple
7552 targets can be specified together. [RFC 1361].
7553 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7554 `RUSTDOC` take precedence over the `build.target-dir`,
7555 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7556 * [The child process tree is killed on Windows when Cargo is
7558 * [The `build.target` configuration value sets the target platform,
7559 like `--target`][1.8ct].
7564 * [Unstable compiler flags have been further restricted][1.8u]. Since
7565 1.0 `-Z` flags have been considered unstable, and other flags that
7566 were considered unstable additionally required passing `-Z
7567 unstable-options` to access. Unlike unstable language and library
7568 features though, these options have been accessible on the stable
7569 release channel. Going forward, *new unstable flags will not be
7570 available on the stable release channel*, and old unstable flags
7571 will warn about their usage. In the future, all unstable flags will
7572 be unavailable on the stable release channel.
7573 * [It is no longer possible to `match` on empty enum variants using
7574 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7575 * The Unix-specific `MetadataExt` traits, including
7576 `os::unix::fs::MetadataExt`, which expose values such as inode
7577 numbers [no longer return platform-specific types][1.8r], but
7578 instead return widened integers. [RFC 1415].
7579 * [Modules sourced from the filesystem cannot appear within arbitrary
7580 blocks, but only within other modules][1.8mf].
7581 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7582 * On Unix, [stack overflow triggers a runtime abort instead of a
7584 * [`Command::spawn` and its equivalents return an error if any of
7585 its command-line arguments contain interior `NUL`s][1.8n].
7586 * [Tuple and unit enum variants from other crates are in the type
7588 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7589 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7590 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7591 instead of `foo.lib`.
7594 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7595 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7596 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7597 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7598 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7599 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7600 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7601 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7602 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7603 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7604 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7605 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7606 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7607 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7608 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7609 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7610 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7611 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7612 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7613 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7614 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7615 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7616 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7617 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7618 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7619 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7620 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7621 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7622 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7623 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7624 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7625 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7626 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7627 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7628 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7629 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7630 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7631 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7632 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7633 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7634 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7635 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7636 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7637 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7638 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7639 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7640 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7641 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7642 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7643 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7644 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7645 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7646 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7647 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7648 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7649 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7650 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7651 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7652 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7653 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7656 Version 1.7.0 (2016-03-03)
7657 ==========================
7664 * [`Path::strip_prefix`] (renamed from relative_from)
7665 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7667 * [`Ipv4Addr::is_loopback`]
7668 * [`Ipv4Addr::is_private`]
7669 * [`Ipv4Addr::is_link_local`]
7670 * [`Ipv4Addr::is_multicast`]
7671 * [`Ipv4Addr::is_broadcast`]
7672 * [`Ipv4Addr::is_documentation`]
7674 * [`Ipv6Addr::is_unspecified`]
7675 * [`Ipv6Addr::is_loopback`]
7676 * [`Ipv6Addr::is_multicast`]
7679 * [`Vec::as_mut_slice`]
7681 * [`String::as_str`]
7682 * [`String::as_mut_str`]
7684 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7686 * `<[T]>::`[`sort_by_key`]
7687 * checked, saturated, and overflowing operations
7688 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7689 * [`i32::saturating_mul`]
7690 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7691 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7692 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7693 * [`u32::saturating_mul`]
7694 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7695 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7696 * and checked, saturated, and overflowing operations for other primitive types
7698 * [`ffi::IntoStringError`]
7699 * [`CString::into_string`]
7700 * [`CString::into_bytes`]
7701 * [`CString::into_bytes_with_nul`]
7702 * `From<CString> for Vec<u8>`
7704 * [`IntoStringError::into_cstring`]
7705 * [`IntoStringError::utf8_error`]
7706 * `Error for IntoStringError`
7708 * [`std::hash::BuildHasher`]
7709 * [`BuildHasher::Hasher`]
7710 * [`BuildHasher::build_hasher`]
7711 * [`std::hash::BuildHasherDefault`]
7712 * [`HashMap::with_hasher`]
7713 * [`HashMap::with_capacity_and_hasher`]
7714 * [`HashSet::with_hasher`]
7715 * [`HashSet::with_capacity_and_hasher`]
7716 * [`std::collections::hash_map::RandomState`]
7717 * [`RandomState::new`]
7718 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7719 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7720 from bytes is faster.
7721 * [The performance of `LineWriter` (and thus `io::stdout`) was
7722 improved by using `memchr` to search for newlines][1.7m].
7723 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7724 `f64` variants were stabilized previously.
7725 * [`BTreeMap` was rewritten to use less memory and improve the performance
7726 of insertion and iteration, the latter by as much as 5x][1.7bm].
7727 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7728 covariant over their contained type][1.7bt].
7729 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7730 over their contained type][1.7ll].
7731 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7733 * [`Any` is implemented for unsized types][1.7a].
7734 * [`Hash` is implemented for `Duration`][1.7h].
7739 * [When running tests with `--test`, rustdoc will pass `--cfg`
7740 arguments to the compiler][1.7dt].
7741 * [The compiler is built with RPATH information by default][1.7rpa].
7742 This means that it will be possible to run `rustc` when installed in
7743 unusual configurations without configuring the dynamic linker search
7745 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7746 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7747 over `LD_LIBRARY_PATH`.
7752 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7753 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7754 * [The `rerun-if-changed` build script directive no longer causes the
7755 build script to incorrectly run twice in certain scenarios][1.7rr].
7760 * Soundness fixes to the interactions between associated types and
7761 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7762 code that violates the new rules. This is a significant change that
7763 is known to break existing code, so it has emitted warnings for the
7764 new error cases since 1.4 to give crate authors time to adapt. The
7765 details of what is changing are subtle; read the RFC for more.
7766 * [Several bugs in the compiler's visibility calculations were
7767 fixed][1.7v]. Since this was found to break significant amounts of
7768 code, the new errors will be emitted as warnings for several release
7769 cycles, under the `private_in_public` lint.
7770 * Defaulted type parameters were accidentally accepted in positions
7771 that were not intended. In this release, [defaulted type parameters
7772 appearing outside of type definitions will generate a
7773 warning][1.7d], which will become an error in future releases.
7774 * [Parsing "." as a float results in an error instead of 0][1.7p].
7775 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7776 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7778 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7779 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7780 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7781 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7782 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7783 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7784 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7785 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7786 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7787 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7788 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7789 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7790 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7791 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7792 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7793 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7794 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7795 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7796 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7797 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7798 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7799 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7800 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7801 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7802 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7803 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7804 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7805 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7806 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7807 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7808 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7809 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7810 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7811 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7812 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7813 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7814 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7815 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7816 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7817 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7818 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7819 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7820 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7821 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7822 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7823 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7824 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7825 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7826 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7827 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7828 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7829 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7830 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7831 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7832 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7833 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7834 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7835 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7836 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7837 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7838 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7839 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7840 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7841 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7842 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7843 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7844 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7845 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7846 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7847 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7848 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7849 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7850 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7851 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7852 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7853 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7854 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7855 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7856 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7859 Version 1.6.0 (2016-01-21)
7860 ==========================
7865 * The `#![no_std]` attribute causes a crate to not be linked to the
7866 standard library, but only the [core library][1.6co], as described
7867 in [RFC 1184]. The core library defines common types and traits but
7868 has no platform dependencies whatsoever, and is the basis for Rust
7869 software in environments that cannot support a full port of the
7870 standard library, such as operating systems. Most of the core
7871 library is now stable.
7877 [`Read::read_exact`],
7878 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7879 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7880 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7881 [`os::unix::fs::DirBuilderExt`],
7882 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7883 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7884 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7885 [`collections::hash_map::Drain`],
7886 [`collections::hash_map::HashMap::drain`],
7887 [`collections::hash_set::Drain`],
7888 [`collections::hash_set::HashSet::drain`],
7889 [`collections::binary_heap::Drain`],
7890 [`collections::binary_heap::BinaryHeap::drain`],
7891 [`Vec::extend_from_slice`] (renamed from `push_all`),
7892 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7893 [`RwLock::into_inner`],
7894 [`Iterator::min_by_key`] (renamed from `min_by`),
7895 [`Iterator::max_by_key`] (renamed from `max_by`).
7896 * The [core library][1.6co] is stable, as are most of its APIs.
7897 * [The `assert_eq!` macro supports arguments that don't implement
7898 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7900 * Several timer functions that take duration in milliseconds [are
7901 deprecated in favor of those that take `Duration`][1.6ms]. These
7902 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7903 `thread::park_timeout_ms`.
7904 * The algorithm by which `Vec` reserves additional elements was
7905 [tweaked to not allocate excessive space][1.6a] while still growing
7907 * `From` conversions are [implemented from integers to floats][1.6f]
7908 in cases where the conversion is lossless. Thus they are not
7909 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7910 or `f64`. They are also not implemented for `isize` and `usize`
7911 because the implementations would be platform-specific. `From` is
7912 also implemented from `f32` to `f64`.
7913 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7914 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7915 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7916 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7918 * Sorting slices that are already sorted [is 50% faster in some
7924 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7925 * Cargo build scripts can specify their dependencies by emitting the
7926 [`rerun-if-changed`][1.6rr] key.
7927 * crates.io will reject publication of crates with dependencies that
7928 have a wildcard version constraint. Crates with wildcard
7929 dependencies were seen to cause a variety of problems, as described
7930 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7932 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7933 release folder. A variety of artifacts that Cargo failed to clean
7934 are now correctly deleted.
7939 * The `unreachable_code` lint [warns when a function call's argument
7941 * The parser indicates [failures that may be caused by
7942 confusingly-similar Unicode characters][1.6uc]
7943 * Certain macro errors [are reported at definition time][1.6m], not
7949 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7950 environment variable when locating crates. This was a pre-cargo
7951 feature for integrating with the package manager that was
7952 accidentally never removed.
7953 * [A number of bugs were fixed in the privacy checker][1.6p] that
7954 could cause previously-accepted code to break.
7955 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7956 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7957 struct pattern syntax (`Foo(..)`) can no longer be used to match
7958 unit structs. This is a warning now, but will become an error in
7959 future releases. Patterns that share the same name as a const are
7961 * A bug was fixed that causes [rustc not to apply default type
7962 parameters][1.6xc] when resolving certain method implementations of
7963 traits defined in other crates.
7965 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7966 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7967 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7968 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7969 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7970 [1.6co]: http://doc.rust-lang.org/core/index.html
7971 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7972 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7973 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7974 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7975 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7976 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7977 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7978 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7979 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7980 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7981 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7982 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7983 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7984 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7985 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7986 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7987 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7988 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7989 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7990 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7991 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7992 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7993 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7994 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7995 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7996 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7997 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7998 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7999 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8000 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8001 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8002 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8003 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8004 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8005 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8006 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8007 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8008 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8009 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8010 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8011 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8014 Version 1.5.0 (2015-12-10)
8015 ==========================
8017 * ~700 changes, numerous bugfixes
8023 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8024 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8025 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8026 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8027 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8028 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8029 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8030 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8031 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8032 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8033 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8034 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8035 [`Path::read_link`], [`Path::symlink_metadata`],
8036 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8037 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8038 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8039 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8040 [`slice::split_first_mut`], [`slice::split_first`],
8041 [`slice::split_last_mut`], [`slice::split_last`],
8042 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8043 [`str::MatchIndices`], [`str::RMatchIndices`],
8044 [`str::match_indices`], [`str::rmatch_indices`],
8045 [`str::slice_mut_unchecked`], [`string::ParseError`].
8046 * Rust applications hosted on crates.io can be installed locally to
8047 `~/.cargo/bin` with the [`cargo install`] command. Among other
8048 things this makes it easier to augment Cargo with new subcommands:
8049 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8050 invoked as `cargo foo`.
8051 * Crates with wildcard (`*`) dependencies will [emit warnings when
8052 published][1.5w]. In 1.6 it will no longer be possible to publish
8053 crates with wildcard dependencies.
8058 * The rules determining when a particular lifetime must outlive
8059 a particular value (known as '[dropck]') have been [modified
8060 to not rely on parametricity][1.5p].
8061 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8062 and `Arc`][1.5a]. Because these smart pointer types implement
8063 `Deref`, this causes breakage in cases where the interior type
8064 contains methods of the same name.
8065 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8066 that they could drop their content. Soundness fix.
8067 * All method invocations are [properly checked][1.5wf1] for
8068 [well-formedness][1.5wf2]. Soundness fix.
8069 * Traits whose supertraits contain `Self` are [not object
8070 safe][1.5o]. Soundness fix.
8071 * Target specifications support a [`no_default_libraries`][1.5nd]
8072 setting that controls whether `-nodefaultlibs` is passed to the
8073 linker, and in turn the `is_like_windows` setting no longer affects
8074 the `-nodefaultlibs` flag.
8075 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8076 * The `#[inline]` and `#[repr]` attributes [can only appear
8077 in valid locations][1.5at].
8078 * Native libraries linked from the local crate are [passed to
8079 the linker before native libraries from upstream crates][1.5nl].
8080 * Two rarely-used attributes, `#[no_debug]` and
8081 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8082 * Negation of unsigned integers, which has been a warning for
8083 several releases, [is now behind a feature gate and will
8084 generate errors][1.5nu].
8085 * The parser accidentally accepted visibility modifiers on
8086 enum variants, a bug [which has been fixed][1.5ev].
8087 * [A bug was fixed that allowed `use` statements to import unstable
8093 * When evaluating expressions at compile-time that are not
8094 compile-time constants (const-evaluating expressions in non-const
8095 contexts), incorrect code such as overlong bitshifts and arithmetic
8096 overflow will [generate a warning instead of an error][1.5ce],
8097 delaying the error until runtime. This will allow the
8098 const-evaluator to be expanded in the future backwards-compatibly.
8099 * The `improper_ctypes` lint [no longer warns about using `isize` and
8100 `usize` in FFI][1.5ict].
8105 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8107 * `Default` is [implemented for mutable slices][1.5d].
8108 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8109 * There are now `From` conversions [between floating point
8110 types][1.5f] where the conversions are lossless.
8111 * There are now `From` conversions [between integer types][1.5i] where
8112 the conversions are lossless.
8113 * [`fs::Metadata` implements `Clone`][1.5fs].
8114 * The `parse` method [accepts a leading "+" when parsing
8116 * [`AsMut` is implemented for `Vec`][1.5am].
8117 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8118 been optimized][1.5cf] and no longer rely on the default impl.
8119 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8120 `unsafe extern "C"` function types now [implement `Clone`,
8121 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8122 `fmt::Debug` for up to 12 arguments][1.5fp].
8123 * [Dropping `Vec`s is much faster in unoptimized builds when the
8124 element types don't implement `Drop`][1.5dv].
8125 * A bug that caused in incorrect behavior when [combining `VecDeque`
8126 with zero-sized types][1.5vdz] was resolved.
8127 * [`PartialOrd` for slices is faster][1.5po].
8132 * [Crate metadata size was reduced by 20%][1.5md].
8133 * [Improvements to code generation reduced the size of libcore by 3.3
8134 MB and rustc's memory usage by 18MB][1.5m].
8135 * [Improvements to deref translation increased performance in
8136 unoptimized builds][1.5dr].
8137 * Various errors in trait resolution [are deduplicated to only be
8138 reported once][1.5te].
8139 * Rust has preliminary [support for rumprun kernels][1.5rr].
8140 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8142 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8143 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8144 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8145 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8146 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8147 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8148 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8149 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8150 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8151 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8152 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8153 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8154 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8155 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8156 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8157 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8158 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8159 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8160 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8161 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8162 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8163 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8164 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8165 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8166 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8167 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8168 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8169 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8170 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8171 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8172 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8173 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8174 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8175 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8176 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8177 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8178 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8179 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8180 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8181 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8182 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8183 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8184 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8185 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8186 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8187 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8188 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8189 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8190 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8191 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8192 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8193 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8194 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8195 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8196 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8197 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8198 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8199 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8200 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8201 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8202 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8203 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8204 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8205 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8206 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8207 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8208 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8209 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8210 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8211 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8212 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8213 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8214 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8215 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8216 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8217 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8218 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8219 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8220 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8221 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8222 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8223 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8224 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8225 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8226 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8227 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8228 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8229 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8230 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8232 Version 1.4.0 (2015-10-29)
8233 ==========================
8235 * ~1200 changes, numerous bugfixes
8240 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8241 GNU) are now supported and recommended for use.
8246 * [Several changes have been made to fix type soundness and improve
8247 the behavior of associated types][sound]. See [RFC 1214]. Although
8248 we have mostly introduced these changes as warnings this release, to
8249 become errors next release, there are still some scenarios that will
8250 see immediate breakage.
8251 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8252 line breaks in addition to `\n`][crlf].
8253 * [Loans of `'static` lifetime extend to the end of a function][stat].
8254 * [`str::parse` no longer introduces avoidable rounding error when
8255 parsing floating point numbers. Together with earlier changes to
8256 float formatting/output, "round trips" like f.to_string().parse()
8257 now preserve the value of f exactly. Additionally, leading plus
8258 signs are now accepted][fp3].
8264 * `use` statements that import multiple items [can now rename
8265 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8266 * [Binops work correctly on fat pointers][binfat].
8267 * `pub extern crate`, which does not behave as expected, [issues a
8268 warning][pec] until a better solution is found.
8273 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8274 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8275 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8276 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8277 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8278 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8279 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8280 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8281 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8282 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8283 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8284 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8285 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8286 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8287 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8288 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8289 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8290 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8292 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8293 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8294 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8295 `f64::from_str_radix`.
8296 * [Reverse-searching strings is faster with the 'two-way'
8298 * [`std::io::copy` allows `?Sized` arguments][cc].
8299 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8300 [override `count`, `nth` and `last` with an O(1)
8301 implementation][it].
8302 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8303 * [`IntoRawFd` has been added to the Unix-specific prelude,
8304 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8306 * [`Extend<String>` and `FromIterator<String` are both implemented for
8308 * [`IntoIterator` is implemented for references to `Option` and
8310 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8311 Copy`][ext] as part of [RFC 839]. This will cause type inference
8312 breakage in rare situations.
8313 * [`BinaryHeap` implements `Debug`][bh2].
8314 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8316 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8317 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8318 * [String comparison is faster][faststr].
8319 * `&mut T` where `T: std::fmt::Write` [also implements
8320 `std::fmt::Write`][mutw].
8321 * [A stable regression in `VecDeque::push_back` and other
8322 capacity-altering methods that caused panics for zero-sized types
8324 * [Function pointers implement traits for up to 12 parameters][fp2].
8329 * The compiler [no longer uses the 'morestack' feature to prevent
8330 stack overflow][mm]. Instead it uses guard pages and stack
8331 probes (though stack probes are not yet implemented on any platform
8333 * [The compiler matches traits faster when projections are involved][p].
8334 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8336 * [Cargo now displays useful information about what its doing during
8337 `cargo update`][cu].
8339 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8340 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8341 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8342 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8343 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8344 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8345 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8346 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8347 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8348 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8349 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8350 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8351 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8352 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8353 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8354 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8355 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8356 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8357 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8358 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8359 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8360 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8361 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8362 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8363 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8364 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8365 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8366 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8367 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8368 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8369 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8370 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8371 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8372 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8373 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8374 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8375 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8376 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8377 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8378 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8379 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8380 [bh2]: https://github.com/rust-lang/rust/pull/28156
8381 [binfat]: https://github.com/rust-lang/rust/pull/28270
8382 [bm]: https://github.com/rust-lang/rust/pull/28197
8383 [cc]: https://github.com/rust-lang/rust/pull/27531
8384 [crlf]: https://github.com/rust-lang/rust/pull/28034
8385 [cu]: https://github.com/rust-lang/cargo/pull/1931
8386 [d]: https://github.com/rust-lang/rust/pull/27825
8387 [dep]: https://github.com/rust-lang/rust/pull/28339
8388 [es]: https://github.com/rust-lang/rust/pull/27956
8389 [ext]: https://github.com/rust-lang/rust/pull/28094
8390 [faststr]: https://github.com/rust-lang/rust/pull/28338
8391 [ffi]: https://github.com/rust-lang/rust/pull/28779
8392 [fp]: https://github.com/rust-lang/rust/pull/28268
8393 [fp2]: https://github.com/rust-lang/rust/pull/28560
8394 [fp3]: https://github.com/rust-lang/rust/pull/27307
8395 [i]: https://github.com/rust-lang/rust/pull/27451
8396 [into2]: https://github.com/rust-lang/rust/pull/28039
8397 [it]: https://github.com/rust-lang/rust/pull/27652
8398 [mm]: https://github.com/rust-lang/rust/pull/27338
8399 [mutw]: https://github.com/rust-lang/rust/pull/28368
8400 [sound]: https://github.com/rust-lang/rust/pull/27641
8401 [p]: https://github.com/rust-lang/rust/pull/27866
8402 [pec]: https://github.com/rust-lang/rust/pull/28486
8403 [pr]: https://github.com/rust-lang/rust/pull/27896
8404 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8405 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8406 [s]: https://github.com/rust-lang/rust/pull/27474
8407 [stab]: https://github.com/rust-lang/rust/pull/28339
8408 [stat]: https://github.com/rust-lang/rust/pull/28321
8409 [vd]: https://github.com/rust-lang/rust/pull/28494
8411 Version 1.3.0 (2015-09-17)
8412 ==============================
8414 * ~900 changes, numerous bugfixes
8419 * The [new object lifetime defaults][nold] have been [turned
8420 on][nold2] after a cycle of warnings about the change. Now types
8421 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8422 being interpreted as `&'a Box<Trait+'a>` to `&'a
8423 Box<Trait+'static>`.
8424 * [The Rustonomicon][nom] is a new book in the official documentation
8425 that dives into writing unsafe Rust.
8426 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8427 timekeeping is employed by other std APIs, as well as out-of-tree
8433 * The [new object lifetime defaults][nold] have been [turned
8434 on][nold2] after a cycle of warnings about the change.
8435 * There is a known [regression][lr] in how object lifetime elision is
8436 interpreted, the proper solution for which is undetermined.
8437 * The `#[prelude_import]` attribute, an internal implementation
8438 detail, was accidentally stabilized previously. [It has been put
8439 behind the `prelude_import` feature gate][pi]. This change is
8440 believed to break no existing code.
8441 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8442 [more sane for dynamically sized types][dst3]. Code that relied on
8443 the previous behavior is thought to be broken.
8444 * The `dropck` rules, which checks that destructors can't access
8445 destroyed values, [have been updated][dropck] to match the
8446 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8447 cause some previously-compiling code to no longer build.
8452 * The [new object lifetime defaults][nold] have been [turned
8453 on][nold2] after a cycle of warnings about the change.
8454 * Semicolons may [now follow types and paths in
8455 macros](https://github.com/rust-lang/rust/pull/27000).
8456 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8457 [more sane for dynamically sized types][dst3]. Code that relied on
8458 the previous behavior is not known to exist, and suspected to be
8460 * `'static` variables [may now be recursive][st].
8461 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8462 implementations correctly.
8463 * The `dropck` rules, which checks that destructors can't access
8464 destroyed values, [have been updated][dropck] to match the
8470 * The [`Duration`] API, [has been stabilized][ds], as well as the
8471 `std::time` module, which presently contains only `Duration`.
8472 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8473 * The owned C string, [`CString`], implements [`Borrow`] and the
8474 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8475 these allow C strings to be borrowed and cloned in generic code.
8476 * [`CStr`] implements [`Debug`].
8477 * [`AtomicPtr`] implements [`Debug`].
8478 * [`Error`] trait objects [can be downcast to their concrete types][e]
8479 in many common configurations, using the [`is`], [`downcast`],
8480 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8482 * Searching for substrings now [employs the two-way algorithm][search]
8483 instead of doing a naive search. This gives major speedups to a
8484 number of methods, including [`contains`][sc], [`find`][sf],
8485 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8486 [`ends_with`][sew] are also faster.
8487 * The performance of `PartialEq` for slices is [much faster][ps].
8488 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8489 is overridden and optimized by the implementations for scalars.
8490 * The [`Hasher`] trait now has a number of specialized `write_*`
8491 methods for primitive types, for efficiency.
8492 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8493 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8494 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8495 of [`std::error::Error::cause`][iec] also delegates to the inner
8497 * [`process::Child`][pc] gained the [`id`] method, which returns a
8498 `u32` representing the platform-specific process identifier.
8499 * The [`connect`] method on slices is deprecated, replaced by the new
8500 [`join`] method (note that both of these are on the *unstable*
8501 [`SliceConcatExt`] trait, but through the magic of the prelude are
8502 available to stable code anyway).
8503 * The [`Div`] operator is implemented for [`Wrapping`] types.
8504 * [`DerefMut` is implemented for `String`][dms].
8505 * Performance of SipHash (the default hasher for `HashMap`) is
8506 [better for long data][sh].
8507 * [`AtomicPtr`] implements [`Send`].
8508 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8509 are now [specialized to use uninitialized buffers for increased
8511 * Lifetime parameters of foreign functions [are now resolved
8517 * Rust can now, with some coercion, [produce programs that run on
8518 Windows XP][xp], though XP is not considered a supported platform.
8519 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8520 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8521 recommended for use in 1.3, though should be fully-functional
8522 in the [64-bit 1.4 beta][b14].
8523 * On Fedora-based systems installation will [properly configure the
8524 dynamic linker][fl].
8525 * The compiler gained many new extended error descriptions, which can
8526 be accessed with the `--explain` flag.
8527 * The `dropck` pass, which checks that destructors can't access
8528 destroyed values, [has been rewritten][dropck]. This fixes some
8529 soundness holes, and as such will cause some previously-compiling
8530 code to no longer build.
8531 * `rustc` now uses [LLVM to write archive files where possible][ar].
8532 Eventually this will eliminate the compiler's dependency on the ar
8534 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8535 supported FreeBSD on x86_64).
8536 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8537 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8539 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8540 will kill the process instead of leaking][nlp].
8542 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8543 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8544 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8545 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8546 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8547 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8548 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8549 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8550 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8551 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8552 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8553 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8554 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8555 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8556 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8557 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8558 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8559 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8560 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8561 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8562 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8563 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8564 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8565 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8566 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8567 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8568 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8569 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8570 [ar]: https://github.com/rust-lang/rust/pull/26926
8571 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8572 [dms]: https://github.com/rust-lang/rust/pull/26241
8573 [dropck]: https://github.com/rust-lang/rust/pull/27261
8574 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8575 [ds]: https://github.com/rust-lang/rust/pull/26818
8576 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8577 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8578 [dst3]: https://github.com/rust-lang/rust/pull/27351
8579 [e]: https://github.com/rust-lang/rust/pull/24793
8580 [f]: https://github.com/rust-lang/rust/pull/26588
8581 [fb]: https://github.com/rust-lang/rust/pull/26959
8582 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8583 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8584 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8585 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8586 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8587 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8588 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8589 [lic]: https://github.com/rust-lang/rust/pull/26583
8590 [lnu]: https://github.com/rust-lang/rust/pull/27026
8591 [lr]: https://github.com/rust-lang/rust/issues/27248
8592 [lum]: https://github.com/rust-lang/rust/pull/26378
8593 [lur]: https://github.com/rust-lang/rust/pull/26783
8594 [nlp]: https://github.com/rust-lang/rust/pull/27176
8595 [nold2]: https://github.com/rust-lang/rust/pull/27045
8596 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8597 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8598 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8599 [pi]: https://github.com/rust-lang/rust/pull/26699
8600 [ps]: https://github.com/rust-lang/rust/pull/26884
8601 [rte]: https://github.com/rust-lang/rust/pull/26950
8602 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8603 [search]: https://github.com/rust-lang/rust/pull/26327
8604 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8605 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8606 [sh]: https://github.com/rust-lang/rust/pull/27280
8607 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8608 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8609 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8610 [st]: https://github.com/rust-lang/rust/pull/26630
8611 [win1]: https://github.com/rust-lang/rust/pull/26569
8612 [win2]: https://github.com/rust-lang/rust/pull/26741
8613 [win3]: https://github.com/rust-lang/rust/pull/26741
8614 [win4]: https://github.com/rust-lang/rust/pull/27210
8615 [xp]: https://github.com/rust-lang/rust/pull/26569
8617 Version 1.2.0 (2015-08-07)
8618 ==========================
8620 * ~1200 changes, numerous bugfixes
8625 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8626 like `Rc` to contain types without a fixed size, arrays and trait
8627 objects, finally enabling use of `Rc<[T]>` and completing the
8628 implementation of DST.
8629 * [Parallel codegen][parcodegen] is now working again, which can
8630 substantially speed up large builds in debug mode; It also gets
8631 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8632 jobs). It's not enabled by default, but will be "in the near
8633 future". It can be activated with the `-C codegen-units=N` flag to
8635 * This is the first release with [experimental support for linking
8636 with the MSVC linker and lib C on Windows (instead of using the GNU
8637 variants via MinGW)][win]. It is yet recommended only for the most
8638 intrepid Rustaceans.
8639 * Benchmark compilations are showing a 30% improvement in
8640 bootstrapping over 1.1.
8645 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8646 unicode case mapping, which is a previously-planned change in
8647 behavior and considered a bugfix.
8648 * [`mem::align_of`] now specifies [the *minimum alignment* for
8649 T][align], which is usually the alignment programs are interested
8650 in, and the same value reported by clang's
8651 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8653 * [The `#[packed]` attribute is no longer silently accepted by the
8654 compiler][packed]. This attribute did nothing and code that
8655 mentioned it likely did not work as intended.
8656 * Associated type defaults are [now behind the
8657 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8658 defaults *did not work*, but could be mentioned syntactically. As
8659 such this breakage has minimal impact.
8664 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8665 matching against dereferenceable values.
8670 * The [`Extend`] trait, which grows a collection from an iterator, is
8671 implemented over iterators of references, for `String`, `Vec`,
8672 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8673 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8674 * The [`iter::once`] function returns an iterator that yields a single
8675 element, and [`iter::empty`] returns an iterator that yields no
8677 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8678 over substring matches.
8679 * [`Cell`] and [`RefCell`] both implement `Eq`.
8680 * A number of methods for wrapping arithmetic are added to the
8681 integral types, [`wrapping_div`], [`wrapping_rem`],
8682 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8683 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8684 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8685 type.. It is illegal for the default arithmetic operations in Rust
8686 to overflow; the desire to wrap must be explicit.
8687 * The `{:#?}` formatting specifier [displays the alternate,
8688 pretty-printed][debugfmt] form of the `Debug` formatter. This
8689 feature was actually introduced prior to 1.0 with little
8691 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8692 for writing data to formatted strings, similar to [`io::Write`].
8693 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8694 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8695 are used by code generators to emit implementations of [`Debug`].
8696 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8697 methods that convert case, following Unicode case mapping.
8698 * It is now easier to handle poisoned locks. The [`PoisonError`]
8699 type, returned by failing lock operations, exposes `into_inner`,
8700 `get_ref`, and `get_mut`, which all give access to the inner lock
8701 guard, and allow the poisoned lock to continue to operate. The
8702 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8703 poisoned lock without attempting to take the lock.
8704 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8705 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8706 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8707 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8709 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8715 * `rustc` employs smarter heuristics for guessing at [typos].
8716 * `rustc` emits more efficient code for [no-op conversions between
8717 unsafe pointers][nop].
8718 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8719 resulting in faster compile times and smaller code.
8721 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8722 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8723 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8724 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8725 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8726 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8727 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8728 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8729 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8730 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8731 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8732 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8733 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8734 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8735 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8736 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8737 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8738 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8739 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8740 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8741 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8742 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8743 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8744 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8745 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8746 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8747 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8748 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8749 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8750 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8751 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8752 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8753 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8754 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8755 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8756 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8757 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8758 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8759 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8760 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8761 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8762 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8763 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8764 [align]: https://github.com/rust-lang/rust/pull/25646
8765 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8766 [typos]: https://github.com/rust-lang/rust/pull/26087
8767 [nop]: https://github.com/rust-lang/rust/pull/26336
8768 [fat]: https://github.com/rust-lang/rust/pull/26411
8769 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8770 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8771 [packed]: https://github.com/rust-lang/rust/pull/25541
8772 [ad]: https://github.com/rust-lang/rust/pull/27382
8773 [win]: https://github.com/rust-lang/rust/pull/25350
8775 Version 1.1.0 (2015-06-25)
8776 =========================
8778 * ~850 changes, numerous bugfixes
8783 * The [`std::fs` module has been expanded][fs] to expand the set of
8784 functionality exposed:
8785 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8786 don't incur a syscall on some platforms.
8787 * A `symlink_metadata` function has been added.
8788 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8789 access to all underlying information.
8790 * The compiler now contains extended explanations of many errors. When an error
8791 with an explanation occurs the compiler suggests using the `--explain` flag
8792 to read the explanation. Error explanations are also [available online][err-index].
8793 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8794 well as other work, the time to bootstrap the compiler decreased by
8800 * The [`str::split_whitespace`] method splits a string on unicode
8801 whitespace boundaries.
8802 * On both Windows and Unix, new extension traits provide conversion of
8803 I/O types to and from the underlying system handles. On Unix, these
8804 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8805 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8806 `TcpListener`, and `UpdSocket`. Further implementations for
8807 `std::process` will be stabilized later.
8808 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8809 Windows, symlinks can be created with
8810 `std::os::windows::symlink_dir` and
8811 `std::os::windows::symlink_file`.
8812 * The `mpsc::Receiver` type can now be converted into an iterator with
8813 `into_iter` on the [`IntoIterator`] trait.
8814 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8815 implementation of the [`From`] trait.
8816 * The `Debug` implementation for `RangeFull` [creates output that is
8817 more consistent with other implementations][rf].
8818 * [`Debug` is implemented for `File`][file].
8819 * The `Default` implementation for `Arc` [no longer requires `Sync +
8821 * [The `Iterator` methods `count`, `nth`, and `last` have been
8822 overridden for slices to have O(1) performance instead of O(n)][si].
8823 * Incorrect handling of paths on Windows has been improved in both the
8824 compiler and the standard library.
8825 * [`AtomicPtr` gained a `Default` implementation][ap].
8826 * In accordance with Rust's policy on arithmetic overflow `abs` now
8827 [panics on overflow when debug assertions are enabled][abs].
8828 * The [`Cloned`] iterator, which was accidentally left unstable for
8829 1.0 [has been stabilized][c].
8830 * The [`Incoming`] iterator, which iterates over incoming TCP
8831 connections, and which was accidentally unnamable in 1.0, [is now
8832 properly exported][inc].
8833 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8834 `sift_up` or `sift_down` panic][bh].
8835 * The [`split_off`] method of `LinkedList` [no longer corrupts
8836 the list in certain scenarios][ll].
8841 * Type checking performance [has improved notably][sk] with
8842 [multiple improvements][pre].
8843 * The compiler [suggests code changes][ch] for more errors.
8844 * rustc and it's build system have experimental support for [building
8845 toolchains against MUSL][m] instead of glibc on Linux.
8846 * The compiler defines the `target_env` cfg value, which is used for
8847 distinguishing toolchains that are otherwise for the same
8848 platform. Presently this is set to `gnu` for common GNU Linux
8849 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8850 * The [`cargo rustc`][crc] command invokes a build with custom flags
8852 * [Android executables are always position independent][pie].
8853 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8856 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8857 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8858 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8859 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8860 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8861 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8862 [rf]: https://github.com/rust-lang/rust/pull/24491
8863 [err-index]: https://doc.rust-lang.org/error-index.html
8864 [sk]: https://github.com/rust-lang/rust/pull/24615
8865 [pre]: https://github.com/rust-lang/rust/pull/25323
8866 [file]: https://github.com/rust-lang/rust/pull/24598
8867 [ch]: https://github.com/rust-lang/rust/pull/24683
8868 [arc]: https://github.com/rust-lang/rust/pull/24695
8869 [si]: https://github.com/rust-lang/rust/pull/24701
8870 [ap]: https://github.com/rust-lang/rust/pull/24834
8871 [m]: https://github.com/rust-lang/rust/pull/24777
8872 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8873 [crc]: https://github.com/rust-lang/cargo/pull/1568
8874 [pie]: https://github.com/rust-lang/rust/pull/24953
8875 [abs]: https://github.com/rust-lang/rust/pull/25441
8876 [c]: https://github.com/rust-lang/rust/pull/25496
8877 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8878 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8879 [inc]: https://github.com/rust-lang/rust/pull/25522
8880 [bh]: https://github.com/rust-lang/rust/pull/25856
8881 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8882 [ll]: https://github.com/rust-lang/rust/pull/26022
8883 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8884 [drop]: https://github.com/rust-lang/rust/pull/24935
8886 Version 1.0.0 (2015-05-15)
8887 ========================
8889 * ~1500 changes, numerous bugfixes
8894 * The vast majority of the standard library is now `#[stable]`. It is
8895 no longer possible to use unstable features with a stable build of
8897 * Many popular crates on [crates.io] now work on the stable release
8899 * Arithmetic on basic integer types now [checks for overflow in debug
8905 * Several [restrictions have been added to trait coherence][coh] in
8906 order to make it easier for upstream authors to change traits
8907 without breaking downstream code.
8908 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8909 improve error messages and macro behavior. For example, `0b1234` is
8910 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8911 * Trait bounds [are always invariant][inv], eliminating the need for
8912 the `PhantomFn` and `MarkerTrait` lang items, which have been
8914 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8915 "foo" as bar` syntax has been replaced with `extern crate foo as
8916 bar`, and Cargo now automatically translates "-" in *package* names
8917 to underscore for the crate name.
8918 * [Lifetime shadowing is an error][lt].
8919 * [`Send` no longer implies `'static`][send-rfc].
8920 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8921 `MyType::default()`.
8922 * Primitive types [now have inherent methods][prim-inherent],
8923 obviating the need for extension traits like `SliceExt`.
8924 * Methods with `Self: Sized` in their `where` clause are [considered
8925 object-safe][self-sized], allowing many extension traits like
8926 `IteratorExt` to be merged into the traits they extended.
8927 * You can now [refer to associated types][assoc-where] whose
8928 corresponding trait bounds appear only in a `where` clause.
8929 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8930 like `Send` and `Sync` are now library-defined.
8931 * A [Reflect trait][reflect] was introduced, which means that
8932 downcasting via the `Any` trait is effectively limited to concrete
8933 types. This helps retain the potentially-important "parametricity"
8934 property: generic code cannot behave differently for different type
8935 arguments except in minor ways.
8936 * The `unsafe_destructor` feature is now deprecated in favor of the
8937 [new `dropck`][dropck]. This change is a major reduction in unsafe
8943 * The `thread_local` module [has been renamed to `std::thread`][th].
8944 * The methods of `IteratorExt` [have been moved to the `Iterator`
8946 * Several traits that implement Rust's conventions for type
8947 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8948 [centralized in the `std::convert` module][con].
8949 * The `FromError` trait [was removed in favor of `From`][fe].
8950 * The basic sleep function [has moved to
8951 `std::thread::sleep_ms`][slp].
8952 * The `splitn` function now takes an `n` parameter that represents the
8953 number of items yielded by the returned iterator [instead of the
8954 number of 'splits'][spl].
8955 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8956 * [Derived implementations of `PartialOrd` now order enums according
8957 to their explicitly-assigned discriminants][po].
8958 * [Methods for searching strings are generic over `Pattern`s][pat],
8959 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8961 * [In method resolution, object methods are resolved before inherent
8963 * [`String::from_str` has been deprecated in favor of the `From` impl,
8964 `String::from`][sf].
8965 * [`io::Error` implements `Sync`][ios].
8966 * [The `words` method on `&str` has been replaced with
8967 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8969 * The new path and IO modules are complete and `#[stable]`. This
8970 was the major library focus for this cycle.
8971 * The path API was [revised][path-normalize] to normalize `.`,
8972 adjusting the tradeoffs in favor of the most common usage.
8973 * A large number of remaining APIs in `std` were also stabilized
8974 during this cycle; about 75% of the non-deprecated API surface
8976 * The new [string pattern API][string-pattern] landed, which makes
8977 the string slice API much more internally consistent and flexible.
8978 * A new set of [generic conversion traits][conversion] replaced
8979 many existing ad hoc traits.
8980 * Generic numeric traits were [completely removed][num-traits]. This
8981 was made possible thanks to inherent methods for primitive types,
8982 and the removal gives maximal flexibility for designing a numeric
8983 hierarchy in the future.
8984 * The `Fn` traits are now related via [inheritance][fn-inherit]
8985 and provide ergonomic [blanket implementations][fn-blanket].
8986 * The `Index` and `IndexMut` traits were changed to
8987 [take the index by value][index-value], enabling code like
8988 `hash_map["string"]` to work.
8989 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8990 `Copy` data is known to be `Clone` as well.
8995 * Many errors now have extended explanations that can be accessed with
8996 the `--explain` flag to `rustc`.
8997 * Many new examples have been added to the standard library
8999 * rustdoc has received a number of improvements focused on completion
9001 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9002 * Much headway was made on ecosystem-wide CI, making it possible
9003 to [compare builds for breakage][ci-compare].
9006 [crates.io]: http://crates.io
9007 [clo]: https://github.com/rust-lang/rust/pull/24034
9008 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9009 [con]: https://github.com/rust-lang/rust/pull/23875
9010 [cr]: https://github.com/rust-lang/rust/pull/23419
9011 [fe]: https://github.com/rust-lang/rust/pull/23879
9012 [ie]: https://github.com/rust-lang/rust/pull/23300
9013 [inv]: https://github.com/rust-lang/rust/pull/23938
9014 [ios]: https://github.com/rust-lang/rust/pull/24133
9015 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9016 [lt]: https://github.com/rust-lang/rust/pull/24057
9017 [meth]: https://github.com/rust-lang/rust/pull/24056
9018 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9019 [po]: https://github.com/rust-lang/rust/pull/24270
9020 [sf]: https://github.com/rust-lang/rust/pull/24517
9021 [slp]: https://github.com/rust-lang/rust/pull/23949
9022 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9023 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9024 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9025 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9026 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9027 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9028 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9029 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9030 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9031 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9032 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9033 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9034 [reflect]: https://github.com/rust-lang/rust/pull/23712
9035 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9036 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9037 [index-value]: https://github.com/rust-lang/rust/pull/23601
9038 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9039 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9040 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9041 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9042 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9043 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9046 Version 1.0.0-alpha.2 (2015-02-20)
9047 =====================================
9049 * ~1300 changes, numerous bugfixes
9053 * The various I/O modules were [overhauled][io-rfc] to reduce
9054 unnecessary abstractions and provide better interoperation with
9055 the underlying platform. The old `io` module remains temporarily
9057 * The standard library now [participates in feature gating][feat],
9058 so use of unstable libraries now requires a `#![feature(...)]`
9059 attribute. The impact of this change is [described on the
9060 forum][feat-forum]. [RFC][feat-rfc].
9064 * `for` loops [now operate on the `IntoIterator` trait][into],
9065 which eliminates the need to call `.iter()`, etc. to iterate
9066 over collections. There are some new subtleties to remember
9067 though regarding what sort of iterators various types yield, in
9068 particular that `for foo in bar { }` yields values from a move
9069 iterator, destroying the original collection. [RFC][into-rfc].
9070 * Objects now have [default lifetime bounds][obj], so you don't
9071 have to write `Box<Trait+'static>` when you don't care about
9072 storing references. [RFC][obj-rfc].
9073 * In types that implement `Drop`, [lifetimes must outlive the
9074 value][drop]. This will soon make it possible to safely
9075 implement `Drop` for types where `#[unsafe_destructor]` is now
9076 required. Read the [gorgeous RFC][drop-rfc] for details.
9077 * The fully qualified <T as Trait>::X syntax lets you set the Self
9078 type for a trait method or associated type. [RFC][ufcs-rfc].
9079 * References to types that implement `Deref<U>` now [automatically
9080 coerce to references][deref] to the dereferenced type `U`,
9081 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9082 should eliminate many unsightly uses of `&*`, as when converting
9083 from references to vectors into references to
9084 slices. [RFC][deref-rfc].
9085 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9086 `|:|`) is obsolete and closure kind is inferred from context.
9087 * [`Self` is a keyword][Self].
9091 * The `Show` and `String` formatting traits [have been
9092 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9093 their related purposes. Automatically getting a string
9094 conversion to use with `format!("{:?}", something_to_debug)` is
9095 now written `#[derive(Debug)]`.
9096 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9097 OsStr}`, provide strings in platform-specific encodings for easier
9098 interop with system APIs. [RFC][osstr-rfc].
9099 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9100 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9101 creating raw pointers.
9105 * Certain long error messages of the form 'expected foo found bar'
9106 are now [split neatly across multiple
9107 lines][multiline]. Examples in the PR.
9108 * On Unix Rust can be [uninstalled][un] by running
9109 `/usr/local/lib/rustlib/uninstall.sh`.
9110 * The `#[rustc_on_unimplemented]` attribute, requiring the
9111 'on_unimplemented' feature, lets rustc [display custom error
9112 messages when a trait is expected to be implemented for a type
9117 * Rust is tested against a [LALR grammar][lalr], which parses
9118 almost all the Rust files that rustc does.
9120 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9121 [close]: https://github.com/rust-lang/rust/pull/21843
9122 [deref]: https://github.com/rust-lang/rust/pull/21351
9123 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9124 [drop]: https://github.com/rust-lang/rust/pull/21972
9125 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9126 [feat]: https://github.com/rust-lang/rust/pull/21248
9127 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9128 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9129 [fmt]: https://github.com/rust-lang/rust/pull/21457
9130 [into]: https://github.com/rust-lang/rust/pull/20790
9131 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9132 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9133 [lalr]: https://github.com/rust-lang/rust/pull/21452
9134 [multiline]: https://github.com/rust-lang/rust/pull/19870
9135 [obj]: https://github.com/rust-lang/rust/pull/22230
9136 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9137 [onun]: https://github.com/rust-lang/rust/pull/20889
9138 [osstr]: https://github.com/rust-lang/rust/pull/21488
9139 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9140 [Self]: https://github.com/rust-lang/rust/pull/22158
9141 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9142 [un]: https://github.com/rust-lang/rust/pull/22256
9145 Version 1.0.0-alpha (2015-01-09)
9146 ==================================
9148 * ~2400 changes, numerous bugfixes
9152 * The language itself is considered feature complete for 1.0,
9153 though there will be many usability improvements and bugfixes
9154 before the final release.
9155 * Nearly 50% of the public API surface of the standard library has
9156 been declared 'stable'. Those interfaces are unlikely to change
9158 * The long-running debate over integer types has been
9159 [settled][ints]: Rust will ship with types named `isize` and
9160 `usize`, rather than `int` and `uint`, for pointer-sized
9161 integers. Guidelines will be rolled out during the alpha cycle.
9162 * Most crates that are not `std` have been moved out of the Rust
9163 distribution into the Cargo ecosystem so they can evolve
9164 separately and don't need to be stabilized as quickly, including
9165 'time', 'getopts', 'num', 'regex', and 'term'.
9166 * Documentation continues to be expanded with more API coverage, more
9167 examples, and more in-depth explanations. The guides have been
9168 consolidated into [The Rust Programming Language][trpl].
9169 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9170 * All official Rust binary installers now come with [Cargo], the
9171 Rust package manager.
9175 * Closures have been [completely redesigned][unboxed] to be
9176 implemented in terms of traits, can now be used as generic type
9177 bounds and thus monomorphized and inlined, or via an opaque
9178 pointer (boxed) as in the old system. The new system is often
9179 referred to as 'unboxed' closures.
9180 * Traits now support [associated types][assoc], allowing families
9181 of related types to be defined together and used generically in
9183 * Enum variants are [namespaced by their type names][enum].
9184 * [`where` clauses][where] provide a more versatile and attractive
9185 syntax for specifying generic bounds, though the previous syntax
9187 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9189 * Rust [no longer has a runtime][rt] of any description, and only
9190 supports OS threads, not green threads.
9191 * At long last, Rust has been overhauled for 'dynamically-sized
9192 types' ([DST]), which integrates 'fat pointers' (object types,
9193 arrays, and `str`) more deeply into the type system, making it
9195 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9196 `..j` that produce range types and which, when combined with the
9197 `Index` operator and multidispatch, leads to a convenient slice
9199 * The new range syntax revealed an ambiguity in the fixed-length
9200 array syntax, so now fixed length arrays [are written `[T;
9202 * The `Copy` trait is no longer implemented automatically. Unsafe
9203 pointers no longer implement `Sync` and `Send` so types
9204 containing them don't automatically either. `Sync` and `Send`
9205 are now 'unsafe traits' so one can "forcibly" implement them via
9206 `unsafe impl` if a type confirms to the requirements for them
9207 even though the internals do not (e.g. structs containing unsafe
9208 pointers like `Arc`). These changes are intended to prevent some
9209 footguns and are collectively known as [opt-in built-in
9210 traits][oibit] (though `Sync` and `Send` will soon become pure
9211 library types unknown to the compiler).
9212 * Operator traits now take their operands [by value][ops], and
9213 comparison traits can use multidispatch to compare one type
9214 against multiple other types, allowing e.g. `String` to be
9215 compared with `&str`.
9216 * `if let` and `while let` are no longer feature-gated.
9217 * Rust has adopted a more [uniform syntax for escaping unicode
9218 characters][unicode].
9219 * `macro_rules!` [has been declared stable][mac]. Though it is a
9220 flawed system it is sufficiently popular that it must be usable
9221 for 1.0. Effort has gone into [future-proofing][mac-future] it
9222 in ways that will allow other macro systems to be developed in
9223 parallel, and won't otherwise impact the evolution of the
9225 * The prelude has been [pared back significantly][prelude] such
9226 that it is the minimum necessary to support the most pervasive
9227 code patterns, and through [generalized where clauses][where]
9228 many of the prelude extension traits have been consolidated.
9229 * Rust's rudimentary reflection [has been removed][refl], as it
9230 incurred too much code generation for little benefit.
9231 * [Struct variants][structvars] are no longer feature-gated.
9232 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9233 known as 'higher-ranked trait bounds', this crucially allows
9234 unboxed closures to work.
9235 * Macros invocations surrounded by parens or square brackets and
9236 not terminated by a semicolon are [parsed as
9237 expressions][macros], which makes expressions like `vec![1i32,
9238 2, 3].len()` work as expected.
9239 * Trait objects now implement their traits automatically, and
9240 traits that can be coerced to objects now must be [object
9242 * Automatically deriving traits is now done with `#[derive(...)]`
9243 not `#[deriving(...)]` for [consistency with other naming
9244 conventions][derive].
9245 * Importing the containing module or enum at the same time as
9246 items or variants they contain is [now done with `self` instead
9247 of `mod`][self], as in use `foo::{self, bar}`
9248 * Glob imports are no longer feature-gated.
9249 * The `box` operator and `box` patterns have been feature-gated
9250 pending a redesign. For now unique boxes should be allocated
9251 like other containers, with `Box::new`.
9255 * A [series][coll1] of [efforts][coll2] to establish
9256 [conventions][coll3] for collections types has resulted in API
9257 improvements throughout the standard library.
9258 * New [APIs for error handling][err] provide ergonomic interop
9259 between error types, and [new conventions][err-conv] describe
9260 more clearly the recommended error handling strategies in Rust.
9261 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9262 it is easier to discuss failure in the context of error handling
9263 without making clarifications as to whether you are referring to
9264 the 'fail' macro or failure more generally.
9265 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9266 syscall when available.
9267 * The 'serialize' crate has been renamed 'rustc-serialize' and
9268 moved out of the distribution to Cargo. Although it is widely
9269 used now, it is expected to be superseded in the near future.
9270 * The `Show` formatter, typically implemented with
9271 `#[derive(Show)]` is [now requested with the `{:?}`
9272 specifier][show] and is intended for use by all types, for uses
9273 such as `println!` debugging. The new `String` formatter must be
9274 implemented by hand, uses the `{}` specifier, and is intended
9275 for full-fidelity conversions of things that can logically be
9276 represented as strings.
9280 * [Flexible target specification][flex] allows rustc's code
9281 generation to be configured to support otherwise-unsupported
9283 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9284 respective debuggers with Rust-appropriate pretty-printing.
9285 * The Windows installation of Rust is distributed with the
9286 MinGW components currently required to link binaries on that
9291 * Nullable enum optimizations have been extended to more types so
9292 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9293 space than the inner types themselves.
9294 * Work has begun on supporting AArch64.
9296 [Cargo]: https://crates.io
9297 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9298 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9299 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9300 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9301 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9302 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9303 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9304 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9305 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9306 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9307 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9308 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9309 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9310 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9311 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9312 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9313 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9314 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9315 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9316 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9317 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9318 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9319 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9320 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9321 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9322 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9323 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9324 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9325 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9326 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9327 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9328 [trpl]: https://doc.rust-lang.org/book/index.html
9329 [rbe]: http://rustbyexample.com/
9332 Version 0.12.0 (2014-10-09)
9333 =============================
9335 * ~1900 changes, numerous bugfixes
9339 * The introductory documentation (now called The Rust Guide) has
9340 been completely rewritten, as have a number of supplementary
9342 * Rust's package manager, Cargo, continues to improve and is
9343 sometimes considered to be quite awesome.
9344 * Many API's in `std` have been reviewed and updated for
9345 consistency with the in-development Rust coding
9346 guidelines. The standard library documentation tracks
9347 stabilization progress.
9348 * Minor libraries have been moved out-of-tree to the rust-lang org
9349 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9350 be installed with Cargo.
9351 * Lifetime elision allows lifetime annotations to be left off of
9352 function declarations in many common scenarios.
9353 * Rust now works on 64-bit Windows.
9356 * Indexing can be overloaded with the `Index` and `IndexMut`
9358 * The `if let` construct takes a branch only if the `let` pattern
9359 matches, currently behind the 'if_let' feature gate.
9360 * 'where clauses', a more flexible syntax for specifying trait
9361 bounds that is more aesthetic, have been added for traits and
9362 free functions. Where clauses will in the future make it
9363 possible to constrain associated types, which would be
9364 impossible with the existing syntax.
9365 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9366 the 'slicing_syntax' feature gate, and can be overloaded with
9367 the `Slice` or `SliceMut` traits.
9368 * The syntax for matching of sub-slices has been changed to use a
9369 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9370 consistency with other uses of `..` and to future-proof
9371 potential additional uses of the syntax.
9372 * The syntax for matching inclusive ranges in patterns has changed
9373 from `0..3` to `0...4` to be consistent with the exclusive range
9375 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9376 c]`) has been put behind the 'advanced_slice_patterns' feature
9377 gate and may be removed in the future.
9378 * Components of tuples and tuple structs can be extracted using
9379 the `value.0` syntax, currently behind the `tuple_indexing`
9381 * The `#[crate_id]` attribute is no longer supported; versioning
9382 is handled by the package manager.
9383 * Renaming crate imports are now written `extern crate foo as bar`
9384 instead of `extern crate bar = foo`.
9385 * Renaming use statements are now written `use foo as bar` instead
9387 * `let` and `match` bindings and argument names in macros are now
9389 * The new, more efficient, closure types ('unboxed closures') have
9390 been added under a feature gate, 'unboxed_closures'. These will
9391 soon replace the existing closure types, once higher-ranked
9392 trait lifetimes are added to the language.
9393 * `move` has been added as a keyword, for indicating closures
9394 that capture by value.
9395 * Mutation and assignment is no longer allowed in pattern guards.
9396 * Generic structs and enums can now have trait bounds.
9397 * The `Share` trait is now called `Sync` to free up the term
9398 'shared' to refer to 'shared reference' (the default reference
9400 * Dynamically-sized types have been mostly implemented,
9401 unifying the behavior of fat-pointer types with the rest of the
9403 * As part of dynamically-sized types, the `Sized` trait has been
9404 introduced, which qualifying types implement by default, and
9405 which type parameters expect by default. To specify that a type
9406 parameter does not need to be sized, write `<Sized? T>`. Most
9407 types are `Sized`, notable exceptions being unsized arrays
9408 (`[T]`) and trait types.
9409 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9410 * Lifetime bounds can now be applied to type parameters and object
9412 * The old, reference counted GC type, `Gc<T>` which was once
9413 denoted by the `@` sigil, has finally been removed. GC will be
9414 revisited in the future.
9417 * Library documentation has been improved for a number of modules.
9418 * Bit-vectors, collections::bitv has been modernized.
9419 * The url crate is deprecated in favor of
9420 http://github.com/servo/rust-url, which can be installed with
9422 * Most I/O stream types can be cloned and subsequently closed from
9424 * A `std::time::Duration` type has been added for use in I/O
9425 methods that rely on timers, as well as in the 'time' crate's
9426 `Timespec` arithmetic.
9427 * The runtime I/O abstraction layer that enabled the green thread
9428 scheduler to do non-thread-blocking I/O has been removed, along
9429 with the libuv-based implementation employed by the green thread
9430 scheduler. This will greatly simplify the future I/O work.
9431 * `collections::btree` has been rewritten to have a more
9432 idiomatic and efficient design.
9435 * rustdoc output now indicates the stability levels of API's.
9436 * The `--crate-name` flag can specify the name of the crate
9437 being compiled, like `#[crate_name]`.
9438 * The `-C metadata` specifies additional metadata to hash into
9439 symbol names, and `-C extra-filename` specifies additional
9440 information to put into the output filename, for use by the
9441 package manager for versioning.
9442 * debug info generation has continued to improve and should be
9443 more reliable under both gdb and lldb.
9444 * rustc has experimental support for compiling in parallel
9445 using the `-C codegen-units` flag.
9446 * rustc no longer encodes rpath information into binaries by
9450 * Stack usage has been optimized with LLVM lifetime annotations.
9451 * Official Rust binaries on Linux are more compatible with older
9452 kernels and distributions, built on CentOS 5.10.
9455 Version 0.11.0 (2014-07-02)
9456 ==========================
9458 * ~1700 changes, numerous bugfixes
9461 * ~[T] has been removed from the language. This type is superseded by
9463 * ~str has been removed from the language. This type is superseded by
9465 * ~T has been removed from the language. This type is superseded by the
9467 * @T has been removed from the language. This type is superseded by the
9468 standard library's std::gc::Gc<T> type.
9469 * Struct fields are now all private by default.
9470 * Vector indices and shift amounts are both required to be a `uint`
9471 instead of any integral type.
9472 * Byte character, byte string, and raw byte string literals are now all
9473 supported by prefixing the normal literal with a `b`.
9474 * Multiple ABIs are no longer allowed in an ABI string
9475 * The syntax for lifetimes on closures/procedures has been tweaked
9476 slightly: `<'a>|A, B|: 'b + K -> T`
9477 * Floating point modulus has been removed from the language; however it
9478 is still provided by a library implementation.
9479 * Private enum variants are now disallowed.
9480 * The `priv` keyword has been removed from the language.
9481 * A closure can no longer be invoked through a &-pointer.
9482 * The `use foo, bar, baz;` syntax has been removed from the language.
9483 * The transmute intrinsic no longer works on type parameters.
9484 * Statics now allow blocks/items in their definition.
9485 * Trait bounds are separated from objects with + instead of : now.
9486 * Objects can no longer be read while they are mutably borrowed.
9487 * The address of a static is now marked as insignificant unless the
9488 #[inline(never)] attribute is placed it.
9489 * The #[unsafe_destructor] attribute is now behind a feature gate.
9490 * Struct literals are no longer allowed in ambiguous positions such as
9491 if, while, match, and for..in.
9492 * Declaration of lang items and intrinsics are now feature-gated by
9494 * Integral literals no longer default to `int`, and floating point
9495 literals no longer default to `f64`. Literals must be suffixed with an
9496 appropriate type if inference cannot determine the type of the
9498 * The Box<T> type is no longer implicitly borrowed to &mut T.
9499 * Procedures are now required to not capture borrowed references.
9502 * The standard library is now a "facade" over a number of underlying
9503 libraries. This means that development on the standard library should
9504 be speedier due to smaller crates, as well as a clearer line between
9506 * A new library, libcore, lives under the standard library's facade
9507 which is Rust's "0-assumption" library, suitable for embedded and
9508 kernel development for example.
9509 * A regex crate has been added to the standard distribution. This crate
9510 includes statically compiled regular expressions.
9511 * The unwrap/unwrap_err methods on Result require a Show bound for
9512 better error messages.
9513 * The return types of the std::comm primitives have been centralized
9514 around the Result type.
9515 * A number of I/O primitives have gained the ability to time out their
9517 * A number of I/O primitives have gained the ability to close their
9518 reading/writing halves to cancel pending operations.
9519 * Reverse iterator methods have been removed in favor of `rev()` on
9520 their forward-iteration counterparts.
9521 * A bitflags! macro has been added to enable easy interop with C and
9522 management of bit flags.
9523 * A debug_assert! macro is now provided which is disabled when
9524 `--cfg ndebug` is passed to the compiler.
9525 * A graphviz crate has been added for creating .dot files.
9526 * The std::cast module has been migrated into std::mem.
9527 * The std::local_data api has been migrated from freestanding functions
9528 to being based on methods.
9529 * The Pod trait has been renamed to Copy.
9530 * jemalloc has been added as the default allocator for types.
9531 * The API for allocating memory has been changed to use proper alignment
9532 and sized deallocation
9533 * Connecting a TcpStream or binding a TcpListener is now based on a
9534 string address and a u16 port. This allows connecting to a hostname as
9536 * The Reader trait now contains a core method, read_at_least(), which
9537 correctly handles many repeated 0-length reads.
9538 * The process-spawning API is now centered around a builder-style
9540 * The :? printing qualifier has been moved from the standard library to
9541 an external libdebug crate.
9542 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9543 have been renamed to Eq/Ord.
9544 * The select/plural methods have been removed from format!. The escapes
9545 for { and } have also changed from \{ and \} to {{ and }},
9547 * The TaskBuilder API has been re-worked to be a true builder, and
9548 extension traits for spawning native/green tasks have been added.
9551 * All breaking changes to the language or libraries now have their
9552 commit message annotated with `[breaking-change]` to allow for easy
9553 discovery of breaking changes.
9554 * The compiler will now try to suggest how to annotate lifetimes if a
9555 lifetime-related error occurs.
9556 * Debug info continues to be improved greatly with general bug fixes and
9557 better support for situations like link time optimization (LTO).
9558 * Usage of syntax extensions when cross-compiling has been fixed.
9559 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9560 -fdata-sections and --gc-sections has been enabled by default
9561 * The compiler is now stricter about where it will load module files
9562 from when a module is declared via `mod foo;`.
9563 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9564 Syntax extensions are now discovered via a "plugin registrar" type
9565 which will be extended in the future to other various plugins.
9566 * Lints have been restructured to allow for dynamically loadable lints.
9567 * A number of rustdoc improvements:
9568 * The HTML output has been visually redesigned.
9569 * Markdown is now powered by hoedown instead of sundown.
9570 * Searching heuristics have been greatly improved.
9571 * The search index has been reduced in size by a great amount.
9572 * Cross-crate documentation via `pub use` has been greatly improved.
9573 * Primitive types are now hyperlinked and documented.
9574 * Documentation has been moved from static.rust-lang.org/doc to
9576 * A new sandbox, play.rust-lang.org, is available for running and
9577 sharing rust code examples on-line.
9578 * Unused attributes are now more robustly warned about.
9579 * The dead_code lint now warns about unused struct fields.
9580 * Cross-compiling to iOS is now supported.
9581 * Cross-compiling to mipsel is now supported.
9582 * Stability attributes are now inherited by default and no longer apply
9583 to intra-crate usage, only inter-crate usage.
9584 * Error message related to non-exhaustive match expressions have been
9588 Version 0.10 (2014-04-03)
9589 =========================
9591 * ~1500 changes, numerous bugfixes
9594 * A new RFC process is now in place for modifying the language.
9595 * Patterns with `@`-pointers have been removed from the language.
9596 * Patterns with unique vectors (`~[T]`) have been removed from the
9598 * Patterns with unique strings (`~str`) have been removed from the
9600 * `@str` has been removed from the language.
9601 * `@[T]` has been removed from the language.
9602 * `@self` has been removed from the language.
9603 * `@Trait` has been removed from the language.
9604 * Headers on `~` allocations which contain `@` boxes inside the type for
9605 reference counting have been removed.
9606 * The semantics around the lifetimes of temporary expressions have changed,
9607 see #3511 and #11585 for more information.
9608 * Cross-crate syntax extensions are now possible, but feature gated. See
9609 #11151 for more information. This includes both `macro_rules!` macros as
9610 well as syntax extensions such as `format!`.
9611 * New lint modes have been added, and older ones have been turned on to be
9613 * Unnecessary parentheses
9616 * Uppercase variables
9617 * Publicly visible private types
9618 * `#[deriving]` with raw pointers
9619 * Unsafe functions can no longer be coerced to closures.
9620 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9621 * The `#[simd]` attribute is now behind a feature gate.
9622 * Visibility is no longer allowed on `extern crate` statements, and
9623 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9624 * Trailing commas are now allowed in argument lists and tuple patterns.
9625 * The `do` keyword has been removed, it is now a reserved keyword.
9626 * Default type parameters have been implemented, but are feature gated.
9627 * Borrowed variables through captures in closures are now considered soundly.
9628 * `extern mod` is now `extern crate`
9629 * The `Freeze` trait has been removed.
9630 * The `Share` trait has been added for types that can be shared among
9632 * Labels in macros are now hygienic.
9633 * Expression/statement macro invocations can be delimited with `{}` now.
9634 * Treatment of types allowed in `static mut` locations has been tweaked.
9635 * The `*` and `.` operators are now overloadable through the `Deref` and
9637 * `~Trait` and `proc` no longer have `Send` bounds by default.
9638 * Partial type hints are now supported with the `_` type marker.
9639 * An `Unsafe` type was introduced for interior mutability. It is now
9640 considered undefined to transmute from `&T` to `&mut T` without using the
9642 * The #[linkage] attribute was implemented for extern statics/functions.
9643 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9644 * `Pod` was renamed to `Copy`.
9647 * The `libextra` library has been removed. It has now been decomposed into
9648 component libraries with smaller and more focused nuggets of
9649 functionality. The full list of libraries can be found on the
9650 documentation index page.
9651 * std: `std::condition` has been removed. All I/O errors are now propagated
9652 through the `Result` type. In order to assist with error handling, a
9653 `try!` macro for unwrapping errors with an early return and a lint for
9654 unused results has been added. See #12039 for more information.
9655 * std: The `vec` module has been renamed to `slice`.
9656 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9657 This will become the only growable vector in the future.
9658 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9659 are now found at `std::io::BufferedReader` instead of
9660 `std::io::buffered::BufferedReader`.
9661 * std: `print` and `println` are no longer in the prelude, the `print!` and
9662 `println!` macros are intended to be used instead.
9663 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9664 attempts to statically prevent cycles.
9665 * std: The standard distribution is adopting the policy of pushing failure
9666 to the user rather than failing in libraries. Many functions (such as
9667 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9668 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9669 deriving mode: `#[deriving(Show)]`.
9670 * std: `ToStr` is now implemented for all types implementing `Show`.
9671 * std: The formatting trait methods now take `&self` instead of `&T`
9672 * std: The `invert()` method on iterators has been renamed to `rev()`
9673 * std: `std::num` has seen a reduction in the genericity of its traits,
9674 consolidating functionality into a few core traits.
9675 * std: Backtraces are now printed on task failure if the environment
9676 variable `RUST_BACKTRACE` is present.
9677 * std: Naming conventions for iterators have been standardized. More details
9678 can be found on the wiki's style guide.
9679 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9680 still implement the function.
9681 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9682 * std: `assert_approx_eq!` has been removed
9683 * std: The `e` and `E` formatting specifiers for floats have been added to
9684 print them in exponential notation.
9685 * std: The `Times` trait has been removed
9686 * std: Indications of variance and opting out of builtin bounds is done
9687 through marker types in `std::kinds::marker` now
9688 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9689 `#[deriving(Hash)]` is now possible.
9690 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9691 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9692 * std: `Chan::new` is now `channel()`.
9693 * std: A new synchronous channel type has been implemented.
9694 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9695 * std: `hashmap` and `trie` have been moved to `libcollections`
9696 * std: `run` has been rolled into `io::process`
9697 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9698 * std: The equality and comparison traits have seen some reorganization.
9699 * std: `rand` has moved to `librand`.
9700 * std: `to_{lower,upper}case` has been implemented for `char`.
9701 * std: Logging has been moved to `liblog`.
9702 * collections: `HashMap` has been rewritten for higher performance and less
9704 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9705 it can be booted manually. The runtime guide has more information and
9707 * native: All I/O functionality except signals has been implemented.
9708 * green: Task spawning with `libgreen` has been optimized with stack caching
9709 and various trimming of code.
9710 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9711 * sync: The `extra::sync` module has been updated to modern rust (and moved
9712 to the `sync` library), tweaking and improving various interfaces while
9713 dropping redundant functionality.
9714 * sync: A new `Barrier` type has been added to the `sync` library.
9715 * sync: An efficient mutex for native and green tasks has been implemented.
9716 * serialize: The `base64` module has seen some improvement. It treats
9717 newlines better, has non-string error values, and has seen general
9719 * fourcc: A `fourcc!` macro was introduced
9720 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9721 hexadecimal literal.
9724 * `rustpkg` has been deprecated and removed from the main repository. Its
9725 replacement, `cargo`, is under development.
9726 * Nightly builds of rust are now available
9727 * The memory usage of rustc has been improved many times throughout this
9729 * The build process supports disabling rpath support for the rustc binary
9731 * Code generation has improved in some cases, giving more information to the
9732 LLVM optimization passes to enable more extensive optimizations.
9733 * Debuginfo compatibility with lldb on OSX has been restored.
9734 * The master branch is now gated on an android bot, making building for
9735 android much more reliable.
9736 * Output flags have been centralized into one `--emit` flag.
9737 * Crate type flags have been centralized into one `--crate-type` flag.
9738 * Codegen flags have been consolidated behind a `-C` flag.
9739 * Linking against outdated crates now has improved error messages.
9740 * Error messages with lifetimes will often suggest how to annotate the
9741 function to fix the error.
9742 * Many more types are documented in the standard library, and new guides
9744 * Many `rustdoc` improvements:
9745 * code blocks are syntax highlighted.
9746 * render standalone markdown files.
9747 * the --test flag tests all code blocks by default.
9748 * exported macros are displayed.
9749 * re-exported types have their documentation inlined at the location of the
9751 * search works across crates that have been rendered to the same output
9755 Version 0.9 (2014-01-09)
9756 ==========================
9758 * ~1800 changes, numerous bugfixes
9761 * The `float` type has been removed. Use `f32` or `f64` instead.
9762 * A new facility for enabling experimental features (feature gating) has
9763 been added, using the crate-level `#[feature(foo)]` attribute.
9764 * Managed boxes (@) are now behind a feature gate
9765 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9766 standard library's `Gc` or `Rc` types instead.
9767 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9768 * Jumping back to the top of a loop is now done with `continue` instead of
9770 * Strings can no longer be mutated through index assignment.
9771 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9772 hash delimiters, as in `r###"foo"###`.
9773 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9775 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9776 * `@fn`s have been removed.
9777 * `do` only works with procs in order to make it obvious what the cost
9779 * Single-element tuple-like structs can no longer be dereferenced to
9780 obtain the inner value. A more comprehensive solution for overloading
9781 the dereference operator will be provided in the future.
9782 * The `#[link(...)]` attribute has been replaced with
9783 `#[crate_id = "name#vers"]`.
9784 * Empty `impl`s must be terminated with empty braces and may not be
9785 terminated with a semicolon.
9786 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9787 no longer has any special meaning.
9788 * The old `fmt!` string formatting macro has been removed.
9789 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9790 `print!` and `println!`.
9791 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9792 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9793 `extern mod foo = "bar"` instead.
9794 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9795 * Macros can have attributes.
9796 * Macros can expand to items with attributes.
9797 * Macros can expand to multiple items.
9798 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9799 * Comments may be nested.
9800 * Values automatically coerce to trait objects they implement, without
9802 * Enum discriminants are no longer an entire word but as small as needed to
9803 contain all the variants. The `repr` attribute can be used to override
9804 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9805 `#[repr(C)]` to match C enums.
9806 * Non-string literals are not allowed in attributes (they never worked).
9807 * The FFI now supports variadic functions.
9808 * Octal numeric literals, as in `0o7777`.
9809 * The `concat!` syntax extension performs compile-time string concatenation.
9810 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9811 removed as Rust no longer uses segmented stacks.
9812 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9813 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9814 not `*`; ignoring remaining fields of a struct is also done with `..`,
9815 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9816 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9817 * `rustc` supports the "system" calling convention, which defaults to the
9818 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9820 * The `type_overflow` lint (default: warn) checks literals for overflow.
9821 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9822 * The `attribute_usage` lint (default: warn) warns about unknown
9824 * The `unknown_features` lint (default: warn) warns about unknown
9826 * The `dead_code` lint (default: warn) checks for dead code.
9827 * Rust libraries can be linked statically to one another
9828 * `#[link_args]` is behind the `link_args` feature gate.
9829 * Native libraries are now linked with `#[link(name = "foo")]`
9830 * Native libraries can be statically linked to a rust crate
9831 (`#[link(name = "foo", kind = "static")]`).
9832 * Native OS X frameworks are now officially supported
9833 (`#[link(name = "foo", kind = "framework")]`).
9834 * The `#[thread_local]` attribute creates thread-local (not task-local)
9835 variables. Currently behind the `thread_local` feature gate.
9836 * The `return` keyword may be used in closures.
9837 * Types that can be copied via a memcpy implement the `Pod` kind.
9838 * The `cfg` attribute can now be used on struct fields and enum variants.
9841 * std: The `option` and `result` API's have been overhauled to make them
9842 simpler, more consistent, and more composable.
9843 * std: The entire `std::io` module has been replaced with one that is
9844 more comprehensive and that properly interfaces with the underlying
9845 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9847 * std: `io::util` contains a number of useful implementations of
9848 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9849 `ZeroReader`, `TeeReader`.
9850 * std: The reference counted pointer type `extra::rc` moved into std.
9851 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9852 just a wrapper around it).
9853 * std: The `Either` type has been removed.
9854 * std: `fmt::Default` can be implemented for any type to provide default
9855 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9856 * std: The `rand` API continues to be tweaked.
9857 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9858 on failure in gdb, is now named `rust_fail`.
9859 * std: The `each_key` and `each_value` methods on `HashMap` have been
9860 replaced by the `keys` and `values` iterators.
9861 * std: Functions dealing with type size and alignment have moved from the
9862 `sys` module to the `mem` module.
9863 * std: The `path` module was written and API changed.
9864 * std: `str::from_utf8` has been changed to cast instead of allocate.
9865 * std: `starts_with` and `ends_with` methods added to vectors via the
9866 `ImmutableEqVector` trait, which is in the prelude.
9867 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9868 if the index is out of bounds.
9869 * std: Task failure no longer propagates between tasks, as the model was
9870 complex, expensive, and incompatible with thread-based tasks.
9871 * std: The `Any` type can be used for dynamic typing.
9872 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9874 * std: Methods that produce iterators generally do not have an `_iter`
9876 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9877 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9878 * std: `util::ignore` renamed to `prelude::drop`.
9879 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9881 * std: `vec::raw` has seen a lot of cleanup and API changes.
9882 * std: The standard library no longer includes any C++ code, and very
9883 minimal C, eliminating the dependency on libstdc++.
9884 * std: Runtime scheduling and I/O functionality has been factored out into
9885 extensible interfaces and is now implemented by two different crates:
9886 libnative, for native threading and I/O; and libgreen, for green threading
9887 and I/O. This paves the way for using the standard library in more limited
9888 embedded environments.
9889 * std: The `comm` module has been rewritten to be much faster, have a
9890 simpler, more consistent API, and to work for both native and green
9892 * std: All libuv dependencies have been moved into the rustuv crate.
9893 * native: New implementations of runtime scheduling on top of OS threads.
9894 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9896 * green: The green thread scheduler and message passing types are almost
9898 * extra: The `flatpipes` module had bitrotted and was removed.
9899 * extra: All crypto functions have been removed and Rust now has a policy of
9900 not reimplementing crypto in the standard library. In the future crypto
9901 will be provided by external crates with bindings to established libraries.
9902 * extra: `c_vec` has been modernized.
9903 * extra: The `sort` module has been removed. Use the `sort` method on
9907 * The `rust` and `rusti` commands have been removed, due to lack of
9909 * `rustdoc` was completely rewritten.
9910 * `rustdoc` can test code examples in documentation.
9911 * `rustpkg` can test packages with the argument, 'test'.
9912 * `rustpkg` supports arbitrary dependencies, including C libraries.
9913 * `rustc`'s support for generating debug info is improved again.
9914 * `rustc` has better error reporting for unbalanced delimiters.
9915 * `rustc`'s JIT support was removed due to bitrot.
9916 * Executables and static libraries can be built with LTO (-Z lto)
9917 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9921 Version 0.8 (2013-09-26)
9922 ============================
9924 * ~2200 changes, numerous bugfixes
9927 * The `for` loop syntax has changed to work with the `Iterator` trait.
9928 * At long last, unwinding works on Windows.
9929 * Default methods are ready for use.
9930 * Many trait inheritance bugs fixed.
9931 * Owned and borrowed trait objects work more reliably.
9932 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9933 * rustc can omit emission of code for the `debug!` macro if it is passed
9935 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9936 for foo.rs, then foo/mod.rs, and will generate an error when both are
9938 * Strings no longer contain trailing nulls. The new `std::c_str` module
9939 provides new mechanisms for converting to C strings.
9940 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9941 * The FFI has been overhauled such that foreign functions are called directly,
9942 instead of through a stack-switching wrapper.
9943 * Calling a foreign function must be done through a Rust function with the
9944 `#[fixed_stack_segment]` attribute.
9945 * The `externfn!` macro can be used to declare both a foreign function and
9946 a `#[fixed_stack_segment]` wrapper at once.
9947 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9948 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9949 * `priv` is disallowed everywhere except for struct fields and enum variants.
9950 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9951 * `ref` bindings in irrefutable patterns work correctly now.
9952 * `char` is now prevented from containing invalid code points.
9953 * Casting to `bool` is no longer allowed.
9954 * `\0` is now accepted as an escape in chars and strings.
9955 * `yield` is a reserved keyword.
9956 * `typeof` is a reserved keyword.
9957 * Crates may be imported by URL with `extern mod foo = "url";`.
9958 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9959 * Static vectors can be initialized with repeating elements,
9960 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9961 * Static structs can be initialized with functional record update,
9962 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9963 * `cfg!` can be used to conditionally execute code based on the crate
9964 configuration, similarly to `#[cfg(...)]`.
9965 * The `unnecessary_qualification` lint detects unneeded module
9966 prefixes (default: allow).
9967 * Arithmetic operations have been implemented on the SIMD types in
9968 `std::unstable::simd`.
9969 * Exchange allocation headers were removed, reducing memory usage.
9970 * `format!` implements a completely new, extensible, and higher-performance
9971 string formatting system. It will replace `fmt!`.
9972 * `print!` and `println!` write formatted strings (using the `format!`
9973 extension) to stdout.
9974 * `write!` and `writeln!` write formatted strings (using the `format!`
9975 extension) to the new Writers in `std::rt::io`.
9976 * The library section in which a function or static is placed may
9977 be specified with `#[link_section = "..."]`.
9978 * The `proto!` syntax extension for defining bounded message protocols
9980 * `macro_rules!` is hygienic for `let` declarations.
9981 * The `#[export_name]` attribute specifies the name of a symbol.
9982 * `unreachable!` can be used to indicate unreachable code, and fails
9986 * std: Transitioned to the new runtime, written in Rust.
9987 * std: Added an experimental I/O library, `rt::io`, based on the new
9989 * std: A new generic `range` function was added to the prelude, replacing
9990 `uint::range` and friends.
9991 * std: `range_rev` no longer exists. Since range is an iterator it can be
9992 reversed with `range(lo, hi).invert()`.
9993 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9994 renamed to `unwrap_or`.
9995 * std: The `iterator` module was renamed to `iter`.
9996 * std: Integral types now support the `checked_add`, `checked_sub`, and
9997 `checked_mul` operations for detecting overflow.
9998 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10000 * std: Methods are standardizing on conventions for casting methods:
10001 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10003 * std: The `CString` type in `c_str` provides new ways to convert to and
10005 * std: `DoubleEndedIterator` can yield elements in two directions.
10006 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10008 * std: `str::from_bytes` renamed to `str::from_utf8`.
10009 * std: `pop_opt` and `shift_opt` methods added to vectors.
10010 * std: The task-local data interface no longer uses @, and keys are
10011 no longer function pointers.
10012 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10013 * std: Added `SharedPort` to `comm`.
10014 * std: `Eq` has a default method for `ne`; only `eq` is required
10015 in implementations.
10016 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10017 is required in implementations.
10018 * std: `is_utf8` performance is improved, impacting many string functions.
10019 * std: `os::MemoryMap` provides cross-platform mmap.
10020 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10021 are not 'in-bounds' are considered undefined.
10022 * std: Many freestanding functions in `vec` removed in favor of methods.
10023 * std: Many freestanding functions on scalar types removed in favor of
10025 * std: Many options to task builders were removed since they don't make
10026 sense in the new scheduler design.
10027 * std: More containers implement `FromIterator` so can be created by the
10029 * std: More complete atomic types in `unstable::atomics`.
10030 * std: `comm::PortSet` removed.
10031 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10032 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10033 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10034 default implementations.
10035 * std: Various `from_str` functions were removed in favor of a generic
10036 `from_str` which is available in the prelude.
10037 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10038 * extra: `dlist`, the doubly-linked list was modernized.
10039 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10040 * extra: Added `glob` module, replacing `std::os::glob`.
10041 * extra: `rope` was removed.
10042 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10043 * extra: `net`, and `timer` were removed. The experimental replacements
10044 are `std::rt::io::net` and `std::rt::io::timer`.
10045 * extra: Iterators implemented for `SmallIntMap`.
10046 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10047 * extra: `SmallIntSet` removed. Use `BitvSet`.
10048 * extra: Performance of JSON parsing greatly improved.
10049 * extra: `semver` updated to SemVer 2.0.0.
10050 * extra: `term` handles more terminals correctly.
10051 * extra: `dbg` module removed.
10052 * extra: `par` module removed.
10053 * extra: `future` was cleaned up, with some method renames.
10054 * extra: Most free functions in `getopts` were converted to methods.
10057 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10058 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10059 similarly to gcc's `--march` flag.
10060 * rustc's performance compiling small crates is much better.
10061 * rustpkg has received many improvements.
10062 * rustpkg supports git tags as package IDs.
10063 * rustpkg builds into target-specific directories so it can be used for
10065 * The number of concurrent test tasks is controlled by the environment
10066 variable RUST_TEST_TASKS.
10067 * The test harness can now report metrics for benchmarks.
10068 * All tools have man pages.
10069 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10070 * The runtime uses jemalloc for allocations.
10071 * Segmented stacks are temporarily disabled as part of the transition to
10072 the new runtime. Stack overflows are possible!
10073 * A new documentation backend, rustdoc_ng, is available for use. It is
10074 still invoked through the normal `rustdoc` command.
10077 Version 0.7 (2013-07-03)
10078 =======================
10080 * ~2000 changes, numerous bugfixes
10083 * `impl`s no longer accept a visibility qualifier. Put them on methods
10085 * The borrow checker has been rewritten with flow-sensitivity, fixing
10086 many bugs and inconveniences.
10087 * The `self` parameter no longer implicitly means `&'self self`,
10088 and can be explicitly marked with a lifetime.
10089 * Overloadable compound operators (`+=`, etc.) have been temporarily
10090 removed due to bugs.
10091 * The `for` loop protocol now requires `for`-iterators to return `bool`
10092 so they compose better.
10093 * The `Durable` trait is replaced with the `'static` bounds.
10094 * Trait default methods work more often.
10095 * Structs with the `#[packed]` attribute have byte alignment and
10096 no padding between fields.
10097 * Type parameters bound by `Copy` must now be copied explicitly with
10098 the `copy` keyword.
10099 * It is now illegal to move out of a dereferenced unsafe pointer.
10100 * `Option<~T>` is now represented as a nullable pointer.
10101 * `@mut` does dynamic borrow checks correctly.
10102 * The `main` function is only detected at the topmost level of the crate.
10103 The `#[main]` attribute is still valid anywhere.
10104 * Struct fields may no longer be mutable. Use inherited mutability.
10105 * The `#[no_send]` attribute makes a type that would otherwise be
10107 * The `#[no_freeze]` attribute makes a type that would otherwise be
10109 * Unbounded recursion will abort the process after reaching the limit
10110 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10111 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10112 are never implicitly copyable.
10113 * `#[static_assert]` makes compile-time assertions about static bools.
10114 * At long last, 'argument modes' no longer exist.
10115 * The rarely used `use mod` statement no longer exists.
10117 * Syntax extensions
10118 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10120 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10121 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10122 `#[deriving(...)]`.
10123 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10124 and unsuffixed integer literals.
10127 * The `core` crate was renamed to `std`.
10128 * The `std` crate was renamed to `extra`.
10129 * More and improved documentation.
10130 * std: `iterator` module for external iterator objects.
10131 * Many old-style (internal, higher-order function) iterators replaced by
10132 implementations of `Iterator`.
10133 * std: Many old internal vector and string iterators,
10134 incl. `any`, `all`. removed.
10135 * std: The `finalize` method of `Drop` renamed to `drop`.
10136 * std: The `drop` method now takes `&mut self` instead of `&self`.
10137 * std: The prelude no longer re-exports any modules, only types and traits.
10138 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10139 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10140 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10141 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10142 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10143 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10144 * std: Many types implement `Clone`.
10145 * std: `path` type renamed to `Path`.
10146 * std: `mut` module and `Mut` type removed.
10147 * std: Many standalone functions removed in favor of methods and iterators
10148 in `vec`, `str`. In the future methods will also work as functions.
10149 * std: `reinterpret_cast` removed. Use `transmute`.
10150 * std: ascii string handling in `std::ascii`.
10151 * std: `Rand` is implemented for ~/@.
10152 * std: `run` module for spawning processes overhauled.
10153 * std: Various atomic types added to `unstable::atomic`.
10154 * std: Various types implement `Zero`.
10155 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10156 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10157 * std: Added `os::mkdir_recursive`.
10158 * std: Added `os::glob` function performs filesystems globs.
10159 * std: `FuzzyEq` renamed to `ApproxEq`.
10160 * std: `Map` now defines `pop` and `swap` methods.
10161 * std: `Cell` constructors converted to static methods.
10162 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10163 * extra: `flate` module moved from `std` to `extra`.
10164 * extra: `fileinput` module for iterating over a series of files.
10165 * extra: `Complex` number type and `complex` module.
10166 * extra: `Rational` number type and `rational` module.
10167 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10168 * extra: `term` uses terminfo now, is more correct.
10169 * extra: `arc` functions converted to methods.
10170 * extra: Implementation of fixed output size variations of SHA-2.
10173 * `unused_variables` lint mode for unused variables (default: warn).
10174 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10176 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10178 * `dead_assignment` lint mode for unread variables (default: warn).
10179 * `unnecessary_allocation` lint mode detects some heap allocations that are
10180 immediately borrowed so could be written without allocating (default: warn).
10181 * `missing_doc` lint mode (default: allow).
10182 * `unreachable_code` lint mode (default: warn).
10183 * The `rusti` command has been rewritten and a number of bugs addressed.
10184 * rustc outputs in color on more terminals.
10185 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10186 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10187 * Compiling with `-g` will make the binary record information about
10188 dynamic borrowcheck failures for debugging.
10189 * rustdoc has a nicer stylesheet.
10190 * Various improvements to rustdoc.
10191 * Improvements to rustpkg (see the detailed release notes).
10194 Version 0.6 (2013-04-03)
10195 ========================
10197 * ~2100 changes, numerous bugfixes
10200 * The self type parameter in traits is now spelled `Self`
10201 * The `self` parameter in trait and impl methods must now be explicitly
10202 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10203 * Static methods no longer require the `static` keyword and instead
10204 are distinguished by the lack of a `self` parameter
10205 * Replaced the `Durable` trait with the `'static` lifetime
10206 * The old closure type syntax with the trailing sigil has been
10207 removed in favor of the more consistent leading sigil
10208 * `super` is a keyword, and may be prefixed to paths
10209 * Trait bounds are separated with `+` instead of whitespace
10210 * Traits are implemented with `impl Trait for Type`
10211 instead of `impl Type: Trait`
10212 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10213 * The `export` keyword has finally been removed
10214 * The `move` keyword has been removed (see "Semantic changes")
10215 * The interior mutability qualifier on vectors, `[mut T]`, has been
10216 removed. Use `&mut [T]`, etc.
10217 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10218 * `fail` is no longer a keyword. Use `fail!()`
10219 * `assert` is no longer a keyword. Use `assert!()`
10220 * `log` is no longer a keyword. use `debug!`, etc.
10221 * 1-tuples may be represented as `(T,)`
10222 * Struct fields may no longer be `mut`. Use inherited mutability,
10223 `@mut T`, `core::mut` or `core::cell`
10224 * `extern mod { ... }` is no longer valid syntax for foreign
10225 function modules. Use extern blocks: `extern { ... }`
10226 * Newtype enums removed. Use tuple-structs.
10227 * Trait implementations no longer support visibility modifiers
10228 * Pattern matching over vectors improved and expanded
10229 * `const` renamed to `static` to correspond to lifetime name,
10230 and make room for future `static mut` unsafe mutable globals.
10231 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10232 * `Clone` implementations can be automatically generated with
10233 `#[deriving(Clone)]`
10234 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10235 instead of `foo as Bar`.
10236 * Fixed length vector types are now written as `[int, .. 3]`
10237 instead of `[int * 3]`.
10238 * Fixed length vector types can express the length as a constant
10239 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10242 * Types with owned pointers or custom destructors move by default,
10243 eliminating the `move` keyword
10244 * All foreign functions are considered unsafe
10245 * &mut is now unaliasable
10246 * Writes to borrowed @mut pointers are prevented dynamically
10248 * The name of the main function can be customized using #[main]
10249 * The default type of an inferred closure is &fn instead of @fn
10250 * `use` statements may no longer be "chained" - they cannot import
10251 identifiers imported by previous `use` statements
10252 * `use` statements are crate relative, importing from the "top"
10253 of the crate by default. Paths may be prefixed with `super::`
10254 or `self::` to change the search behavior.
10255 * Method visibility is inherited from the implementation declaration
10256 * Structural records have been removed
10257 * Many more types can be used in static items, including enums
10258 'static-lifetime pointers and vectors
10259 * Pattern matching over vectors improved and expanded
10260 * Typechecking of closure types has been overhauled to
10261 improve inference and eliminate unsoundness
10262 * Macros leave scope at the end of modules, unless that module is
10263 tagged with #[macro_escape]
10266 * Added big integers to `std::bigint`
10267 * Removed `core::oldcomm` module
10268 * Added pipe-based `core::comm` module
10269 * Numeric traits have been reorganized under `core::num`
10270 * `vec::slice` finally returns a slice
10271 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10272 * Containers reorganized around traits in `core::container`
10273 * `core::dvec` removed, `~[T]` is a drop-in replacement
10274 * `core::send_map` renamed to `core::hashmap`
10275 * `std::map` removed; replaced with `core::hashmap`
10276 * `std::treemap` reimplemented as an owned balanced tree
10277 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10278 * `core::trie` added as a fast ordered map for integer keys
10279 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10280 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10281 overload the comparison operators, whereas `TotalOrd` is used
10282 by certain container types
10285 * Replaced the 'cargo' package manager with 'rustpkg'
10286 * Added all-purpose 'rust' tool
10287 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10288 * rustc now *attempts* to offer spelling suggestions
10289 * Improved support for ARM and Android
10290 * Preliminary MIPS backend
10291 * Improved foreign function ABI implementation for x86, x86_64
10292 * Various memory usage improvements
10293 * Rust code may be embedded in foreign code under limited circumstances
10294 * Inline assembler supported by new asm!() syntax extension.
10297 Version 0.5 (2012-12-21)
10298 ===========================
10300 * ~900 changes, numerous bugfixes
10303 * Removed `<-` move operator
10304 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10305 * Removed old fixed length vector syntax - `[T]/N`
10306 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10307 * Macros may now expand to items and statements
10308 * `a.b()` is always parsed as a method call, never as a field projection
10309 * `Eq` and `IterBytes` implementations can be automatically generated
10310 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10311 * Removed the special crate language for `.rc` files
10312 * Function arguments may consist of any irrefutable pattern
10315 * `&` and `~` pointers may point to objects
10316 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10317 * Enum variants may be structs
10318 * Destructors can be added to all nominal types with the Drop trait
10319 * Structs and nullary enum variants may be constants
10320 * Values that cannot be implicitly copied are now automatically moved
10321 without writing `move` explicitly
10322 * `&T` may now be coerced to `*T`
10323 * Coercions happen in `let` statements as well as function calls
10324 * `use` statements now take crate-relative paths
10325 * The module and type namespaces have been merged so that static
10326 method names can be resolved under the trait in which they are
10329 * Improved support for language features
10330 * Trait inheritance works in many scenarios
10331 * More support for explicit self arguments in methods - `self`, `&self`
10332 `@self`, and `~self` all generally work as expected
10333 * Static methods work in more situations
10334 * Experimental: Traits may declare default methods for the implementations
10338 * New condition handling system in `core::condition`
10339 * Timsort added to `std::sort`
10340 * New priority queue, `std::priority_queue`
10341 * Pipes for serializable types, `std::flatpipes'
10342 * Serialization overhauled to be trait-based
10343 * Expanded `getopts` definitions
10344 * Moved futures to `std`
10345 * More functions are pure now
10346 * `core::comm` renamed to `oldcomm`. Still deprecated
10347 * `rustdoc` and `cargo` are libraries now
10350 * Added a preliminary REPL, `rusti`
10351 * License changed from MIT to dual MIT/APL2
10354 Version 0.4 (2012-10-15)
10355 ==========================
10357 * ~2000 changes, numerous bugfixes
10360 * All keywords are now strict and may not be used as identifiers anywhere
10361 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10362 'of', 'with', 'to', 'class'.
10363 * Classes are replaced with simpler structs
10364 * Explicit method self types
10365 * `ret` became `return` and `alt` became `match`
10366 * `import` is now `use`; `use is now `extern mod`
10367 * `extern mod { ... }` is now `extern { ... }`
10368 * `use mod` is the recommended way to import modules
10369 * `pub` and `priv` replace deprecated export lists
10370 * The syntax of `match` pattern arms now uses fat arrow (=>)
10371 * `main` no longer accepts an args vector; use `os::args` instead
10374 * Trait implementations are now coherent, ala Haskell typeclasses
10375 * Trait methods may be static
10376 * Argument modes are deprecated
10377 * Borrowed pointers are much more mature and recommended for use
10378 * Strings and vectors in the static region are stored in constant memory
10379 * Typestate was removed
10380 * Resolution rewritten to be more reliable
10381 * Support for 'dual-mode' data structures (freezing and thawing)
10384 * Most binary operators can now be overloaded via the traits in
10386 * `std::net::url` for representing URLs
10387 * Sendable hash maps in `core::send_map`
10388 * `core::task' gained a (currently unsafe) task-local storage API
10391 * An efficient new intertask communication primitive called the pipe,
10392 along with a number of higher-level channel types, in `core::pipes`
10393 * `std::arc`, an atomically reference counted, immutable, shared memory
10395 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10396 * Futures are now based on pipes and sendable
10397 * More robust linked task failure
10398 * Improved task builder API
10401 * Improved error reporting
10402 * Preliminary JIT support
10403 * Preliminary work on precise GC
10404 * Extensive architectural improvements to rustc
10405 * Begun a transition away from buggy C++-based reflection (shape) code to
10406 Rust-based (visitor) code
10407 * All hash functions and tables converted to secure, randomized SipHash
10410 Version 0.3 (2012-07-12)
10411 ========================
10413 * ~1900 changes, numerous bugfixes
10415 * New coding conveniences
10416 * Integer-literal suffix inference
10417 * Per-item control over warnings, errors
10418 * #[cfg(windows)] and #[cfg(unix)] attributes
10419 * Documentation comments
10420 * More compact closure syntax
10421 * 'do' expressions for treating higher-order functions as
10423 * *-patterns (wildcard extended to all constructor fields)
10426 * Name resolution pass and exhaustiveness checker rewritten
10427 * Region pointers and borrow checking supersede alias
10429 * Init-ness checking is now provided by a region-based liveness
10430 pass instead of the typestate pass; same for last-use analysis
10431 * Extensive work on region pointers
10433 * Experimental new language features
10434 * Slices and fixed-size, interior-allocated vectors
10435 * #!-comments for lang versioning, shell execution
10436 * Destructors and iface implementation for classes;
10437 type-parameterized classes and class methods
10438 * 'const' type kind for types that can be used to implement
10439 shared-memory concurrency patterns
10443 * Removal of various obsolete features
10444 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10445 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10447 * Constructs: do-while loops ('do' repurposed), fn binding,
10448 resources (replaced by destructors)
10450 * Compiler reorganization
10451 * Syntax-layer of compiler split into separate crate
10452 * Clang (from LLVM project) integrated into build
10453 * Typechecker split into sub-modules
10456 * New time functions
10457 * Extension methods for many built-in types
10458 * Arc: atomic-refcount read-only / exclusive-use shared cells
10459 * Par: parallel map and search routines
10460 * Extensive work on libuv interface
10461 * Much vector code moved to libraries
10462 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10463 #include, #include_str, #include_bin
10465 * Tool improvements
10466 * Cargo automatically resolves dependencies
10469 Version 0.2 (2012-03-29)
10470 =========================
10472 * >1500 changes, numerous bugfixes
10474 * New docs and doc tooling
10476 * New port: FreeBSD x86_64
10478 * Compilation model enhancements
10479 * Generics now specialized, multiply instantiated
10480 * Functions now inlined across separate crates
10482 * Scheduling, stack and threading fixes
10483 * Noticeably improved message-passing performance
10484 * Explicit schedulers
10488 * Experimental new language features
10489 * Operator overloading
10493 * Various language extensions
10494 * C-callback function types: 'crust fn ...'
10495 * Infinite-loop construct: 'loop { ... }'
10496 * Shorten 'mutable' to 'mut'
10497 * Required mutable-local qualifier: 'let mut ...'
10498 * Basic glob-exporting: 'export foo::*;'
10499 * Alt now exhaustive, 'alt check' for runtime-checked
10500 * Block-function form of 'for' loop, with 'break' and 'ret'.
10503 * AST quasi-quote syntax extension
10504 * Revived libuv interface
10505 * New modules: core::{future, iter}, std::arena
10506 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10507 * Extensive cleanup, regularization in libstd, libcore
10510 Version 0.1 (2012-01-20)
10511 ===============================
10513 * Most language features work, including:
10514 * Unique pointers, unique closures, move semantics
10515 * Interface-constrained generics
10516 * Static interface dispatch
10518 * Multithread task scheduling
10519 * Typestate predicates
10520 * Failure unwinding, destructors
10521 * Pattern matching and destructuring assignment
10522 * Lightweight block-lambda syntax
10523 * Preliminary macro-by-example
10525 * Compiler works with the following configurations:
10526 * Linux: x86 and x86_64 hosts and targets
10527 * macOS: x86 and x86_64 hosts and targets
10528 * Windows: x86 hosts and targets
10530 * Cross compilation / multi-target configuration supported.
10532 * Preliminary API-documentation and package-management tools included.
10536 * Documentation is incomplete.
10538 * Performance is below intended target.
10540 * Standard library APIs are subject to extensive change, reorganization.
10542 * Language-level versioning is not yet operational - future code will
10543 break unexpectedly.