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 `powerpc64le-unknown-freebsd`.][83572]
15 \* Refer to Rust's [platform support page][platform-support-doc] for more
16 information on Rust's tiered platform support.
21 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
22 These improvements should in general provide faster string parsing of floats,
23 no longer reject certain valid floating point values, and reduce
24 the produced code size for non-stripped artifacts.
25 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
32 - [`IntoInnerError::into_error`]
33 - [`IntoInnerError::into_parts`]
34 - [`MaybeUninit::assume_init_mut`]
35 - [`MaybeUninit::assume_init_ref`]
36 - [`MaybeUninit::write`]
38 - [`ops::ControlFlow`]
40 - [`x86::_bittestandcomplement`]
41 - [`x86::_bittestandreset`]
42 - [`x86::_bittestandset`]
43 - [`x86_64::_bittest64`]
44 - [`x86_64::_bittestandcomplement64`]
45 - [`x86_64::_bittestandreset64`]
46 - [`x86_64::_bittestandset64`]
48 The following previously stable functions are now `const`.
50 - [`str::from_utf8_unchecked`]
55 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
56 rustc in parallel such as when using `cargo test`.][cargo/9675]
57 - [The package definition in `cargo metadata` now includes the `"default_run"`
58 field from the manifest.][cargo/9550]
59 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
60 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
61 of packages.][cargo/9663]
65 - [Added "Go to item on exact match" search option.][85876]
66 - [The "Implementors" section on traits no longer shows redundant
67 method definitions.][85970]
68 - [Trait implementations are toggled open by default.][86260] This should make the
69 implementations more searchable by tools like `CTRL+F` in your browser.
70 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
71 through type aliases.][86334]
72 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
73 "Trait Implementations" section.][86513]
78 - [std functions that return an `io::Error` will no longer use the
79 `ErrorKind::Other` variant.][85746] This is to better reflect that these
80 kinds of errors could be categorised [into newer more specific `ErrorKind`
81 variants][79965], and that they do not represent a user error.
82 - [Using environment variable names with `process::Command` on Windows now
83 behaves as expected.][85270] Previously using envionment variables with
84 `Command` would cause them to be ASCII-uppercased.
85 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
86 with `rustdoc::`][86849]
88 [86849]: https://github.com/rust-lang/rust/pull/86849
89 [86513]: https://github.com/rust-lang/rust/pull/86513
90 [86334]: https://github.com/rust-lang/rust/pull/86334
91 [86260]: https://github.com/rust-lang/rust/pull/86260
92 [85970]: https://github.com/rust-lang/rust/pull/85970
93 [85876]: https://github.com/rust-lang/rust/pull/85876
94 [83572]: https://github.com/rust-lang/rust/pull/83572
95 [86294]: https://github.com/rust-lang/rust/pull/86294
96 [86858]: https://github.com/rust-lang/rust/pull/86858
97 [86761]: https://github.com/rust-lang/rust/pull/86761
98 [85769]: https://github.com/rust-lang/rust/pull/85769
99 [85746]: https://github.com/rust-lang/rust/pull/85746
100 [85305]: https://github.com/rust-lang/rust/pull/85305
101 [85270]: https://github.com/rust-lang/rust/pull/85270
102 [84111]: https://github.com/rust-lang/rust/pull/84111
103 [83918]: https://github.com/rust-lang/rust/pull/83918
104 [79965]: https://github.com/rust-lang/rust/pull/79965
105 [87370]: https://github.com/rust-lang/rust/pull/87370
106 [87298]: https://github.com/rust-lang/rust/pull/87298
107 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
108 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
109 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
110 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
111 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
112 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
113 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
114 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
115 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
116 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
117 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
118 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
119 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
120 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
121 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
122 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
123 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
124 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
125 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
126 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
127 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
128 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
129 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
130 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
133 Version 1.54.0 (2021-07-29)
134 ============================
137 -----------------------
139 - [You can now use macros for values in some built-in attributes.][83366]
140 This primarily allows you to call macros within the `#[doc]` attribute. For
141 example, to include external documentation in your crate, you can now write
144 #![doc = include_str!("README.md")]
147 - [You can now cast between unsized slice types (and types which contain
148 unsized slices) in `const fn`.][85078]
149 - [You can now use multiple generic lifetimes with `impl Trait` where the
150 lifetimes don't explicitly outlive another.][84701] In code this means
151 that you can now have `impl Trait<'a, 'b>` where as before you could
152 only have `impl Trait<'a, 'b> where 'b: 'a`.
155 -----------------------
157 - [Rustc will now search for custom JSON targets in
158 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
159 directory.][83800] You can find your sysroot directory by running
160 `rustc --print sysroot`.
161 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
162 - [You can now use `#[target_feature]` on safe functions when targeting
163 WebAssembly platforms.][84988]
164 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
165 - [Added tier 3\* support for `bpfel-unknown-none`
166 and `bpfeb-unknown-none`.][79608]
167 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
169 \* Refer to Rust's [platform support page][platform-support-doc] for more
170 information on Rust's tiered platform support.
173 -----------------------
175 - [`panic::panic_any` will now `#[track_caller]`.][85745]
176 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
177 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
178 - [The implementations of vendor intrinsics in core::arch have been
179 significantly refactored.][83278] The main user-visible changes are
180 a 50% reduction in the size of libcore.rlib and stricter validation
181 of constant operands passed to intrinsics. The latter is technically
182 a breaking change, but allows Rust to more closely match the C vendor
188 - [`BTreeMap::into_keys`]
189 - [`BTreeMap::into_values`]
190 - [`HashMap::into_keys`]
191 - [`HashMap::into_values`]
193 - [`VecDeque::binary_search`]
194 - [`VecDeque::binary_search_by`]
195 - [`VecDeque::binary_search_by_key`]
196 - [`VecDeque::partition_point`]
201 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
202 the dependency graph.][cargo/9520]
203 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
204 in the tree ][cargo/9499]
205 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
206 macro dependencies.][cargo/9488]
207 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
208 This variable points to a directory that integration tests and benches
209 can use as a "scratchpad" for testing filesystem operations.
213 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
214 - [Previously unsound code is no longer permitted where different constructors in branches
215 could require different lifetimes.][85574]
216 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
217 than before and may reject some previously accepted code.
218 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
219 when compiled with `codegen-units = 1`.][86063]
221 [85574]: https://github.com/rust-lang/rust/issues/85574
222 [86831]: https://github.com/rust-lang/rust/issues/86831
223 [86063]: https://github.com/rust-lang/rust/issues/86063
224 [86831]: https://github.com/rust-lang/rust/issues/86831
225 [79608]: https://github.com/rust-lang/rust/pull/79608
226 [84988]: https://github.com/rust-lang/rust/pull/84988
227 [84701]: https://github.com/rust-lang/rust/pull/84701
228 [84072]: https://github.com/rust-lang/rust/pull/84072
229 [85745]: https://github.com/rust-lang/rust/pull/85745
230 [84744]: https://github.com/rust-lang/rust/pull/84744
231 [85078]: https://github.com/rust-lang/rust/pull/85078
232 [84717]: https://github.com/rust-lang/rust/pull/84717
233 [83800]: https://github.com/rust-lang/rust/pull/83800
234 [83366]: https://github.com/rust-lang/rust/pull/83366
235 [83278]: https://github.com/rust-lang/rust/pull/83278
236 [85292]: https://github.com/rust-lang/rust/pull/85292
237 [82834]: https://github.com/rust-lang/rust/pull/82834
238 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
239 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
240 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
241 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
242 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
243 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
244 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
245 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
246 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
247 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
248 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
250 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
252 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
254 Version 1.53.0 (2021-06-17)
255 ============================
258 -----------------------
259 - [You can now use unicode for identifiers.][83799] This allows multilingual
260 identifiers but still doesn't allow glyphs that are not considered characters
261 such as `◆` or `🦀`. More specifically you can now use any identifier that
262 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
263 is the same standard as languages like Python, however Rust uses NFC
264 normalization which may be different from other languages.
265 - [You can now specify "or patterns" inside pattern matches.][79278]
266 Previously you could only use `|` (OR) on complete patterns. E.g.
270 matches!(x, Some(1) | Some(2));
272 matches!(x, Some(1 | 2));
274 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
275 has the same semantics as the `:pat` matcher. This is to allow `:pat`
276 to change semantics to being a pattern fragment in a future edition.
279 -----------------------
280 - [Updated the minimum external LLVM version to LLVM 10.][83387]
281 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
282 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
284 \* Refer to Rust's [platform support page][platform-support-doc] for more
285 information on Rust's tiered platform support.
288 -----------------------
289 - [Abort messages will now forward to `android_set_abort_message` on
290 Android platforms when available.][81469]
291 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
292 - [Arrays of any length now implement `IntoIterator`.][84147]
293 Currently calling `.into_iter()` as a method on an array will
294 return `impl Iterator<Item=&T>`, but this may change in a
295 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
296 directly on arrays will provide `impl Iterator<Item=T>` as expected.
297 - [`leading_zeros`, and `trailing_zeros` are now available on all
298 `NonZero` integer types.][84082]
299 - [`{f32, f64}::from_str` now parse and print special values
300 (`NaN`, `-0`) according to IEEE 754.][78618]
301 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
302 - [Add the `BITS` associated constant to all numeric types.][82565]
306 - [`AtomicBool::fetch_update`]
307 - [`AtomicPtr::fetch_update`]
308 - [`BTreeMap::retain`]
309 - [`BTreeSet::retain`]
310 - [`BufReader::seek_relative`]
311 - [`DebugStruct::non_exhaustive`]
314 - [`Duration::is_zero`]
315 - [`Duration::saturating_add`]
316 - [`Duration::saturating_mul`]
317 - [`Duration::saturating_sub`]
318 - [`ErrorKind::Unsupported`]
320 - [`Ordering::is_eq`]
321 - [`Ordering::is_ge`]
322 - [`Ordering::is_gt`]
323 - [`Ordering::is_le`]
324 - [`Ordering::is_lt`]
325 - [`Ordering::is_ne`]
326 - [`OsStr::is_ascii`]
327 - [`OsStr::make_ascii_lowercase`]
328 - [`OsStr::make_ascii_uppercase`]
329 - [`OsStr::to_ascii_lowercase`]
330 - [`OsStr::to_ascii_uppercase`]
331 - [`Peekable::peek_mut`]
332 - [`Rc::decrement_strong_count`]
333 - [`Rc::increment_strong_count`]
334 - [`Vec::extend_from_within`]
335 - [`array::from_mut`]
336 - [`array::from_ref`]
337 - [`cmp::max_by_key`]
339 - [`cmp::min_by_key`]
341 - [`f32::is_subnormal`]
342 - [`f64::is_subnormal`]
345 -----------------------
346 - [Cargo now supports git repositories where the default `HEAD` branch is not
347 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
348 which can handle default branches correctly.
349 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
350 - [The `authors` field is no longer included in `Cargo.toml` for new
351 projects.][cargo/9282]
354 -----------------------
355 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
356 without hyperlinks.][81764]
360 - [Implement token-based handling of attributes during expansion][82608]
361 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
362 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
363 to confusion and potential security vulnerabilities and [is no
364 longer recommended][ietf6943].
365 - [The added `BITS` constant may conflict with external definitions.][85667]
366 In particular, this was known to be a problem in the `lexical-core` crate,
367 but they have published fixes for semantic versions 0.4 through 0.7. To
368 update this dependency alone, use `cargo update -p lexical-core`.
369 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
373 These changes provide no direct user facing benefits, but represent significant
374 improvements to the internals and overall performance of rustc and
377 - [Rework the `std::sys::windows::alloc` implementation.][83065]
378 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
379 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
380 - [Rework rustdoc const type][82873]
382 [85667]: https://github.com/rust-lang/rust/pull/85667
383 [83386]: https://github.com/rust-lang/rust/pull/83386
384 [82771]: https://github.com/rust-lang/rust/pull/82771
385 [84147]: https://github.com/rust-lang/rust/pull/84147
386 [84082]: https://github.com/rust-lang/rust/pull/84082
387 [83799]: https://github.com/rust-lang/rust/pull/83799
388 [83681]: https://github.com/rust-lang/rust/pull/83681
389 [83652]: https://github.com/rust-lang/rust/pull/83652
390 [83387]: https://github.com/rust-lang/rust/pull/83387
391 [82873]: https://github.com/rust-lang/rust/pull/82873
392 [82864]: https://github.com/rust-lang/rust/pull/82864
393 [82608]: https://github.com/rust-lang/rust/pull/82608
394 [82565]: https://github.com/rust-lang/rust/pull/82565
395 [80525]: https://github.com/rust-lang/rust/pull/80525
396 [79278]: https://github.com/rust-lang/rust/pull/79278
397 [78618]: https://github.com/rust-lang/rust/pull/78618
398 [77704]: https://github.com/rust-lang/rust/pull/77704
399 [83941]: https://github.com/rust-lang/rust/pull/83941
400 [83065]: https://github.com/rust-lang/rust/pull/83065
401 [81764]: https://github.com/rust-lang/rust/pull/81764
402 [81469]: https://github.com/rust-lang/rust/pull/81469
403 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
404 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
405 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
406 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
407 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
408 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
409 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
410 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
411 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
412 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
413 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
414 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
415 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
416 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
417 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
418 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
419 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
420 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
421 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
422 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
423 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
424 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
425 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
426 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
427 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
428 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
429 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
430 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
431 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
432 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
433 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
434 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
435 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
436 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
437 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
438 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
439 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
440 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
441 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
442 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
443 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
444 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
447 Version 1.52.1 (2021-05-10)
448 ============================
450 This release disables incremental compilation, unless the user has explicitly
451 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
453 This is due to the widespread, and frequently occuring, breakage encountered by
454 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
455 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
456 newly added incremental verification are still present in past stable versions,
457 and are not yet fixed on any channel. These bugs can lead to miscompilation of
460 These problems only affect incremental builds, so release builds with Cargo
461 should not be affected unless the user has explicitly opted into incremental.
462 Debug and check builds are affected.
464 See [84970] for more details.
466 [84970]: https://github.com/rust-lang/rust/issues/84970
468 Version 1.52.0 (2021-05-06)
469 ============================
473 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
474 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
475 is allowed by default, and may become a warning or hard error in a
477 - [You can now cast mutable references to arrays to a pointer of the same type as
482 - [Upgraded the default LLVM to LLVM 12.][81451]
484 Added tier 3\* support for the following targets.
486 - [`s390x-unknown-linux-musl`][82166]
487 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
488 - [`powerpc-unknown-openbsd`][82733]
490 \* Refer to Rust's [platform support page][platform-support-doc] for more
491 information on Rust's tiered platform support.
495 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
496 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
497 - [`Arc<impl Error>` now implements `error::Error`.][80553]
498 - [All integer division and remainder operations are now `const`.][80962]
502 - [`Arguments::as_str`]
504 - [`char::REPLACEMENT_CHARACTER`]
505 - [`char::UNICODE_VERSION`]
506 - [`char::decode_utf16`]
507 - [`char::from_digit`]
508 - [`char::from_u32_unchecked`]
510 - [`slice::partition_point`]
511 - [`str::rsplit_once`]
512 - [`str::split_once`]
514 The following previously stable APIs are now `const`.
517 - [`char::len_utf16`]
518 - [`char::to_ascii_uppercase`]
519 - [`char::to_ascii_lowercase`]
520 - [`char::eq_ignore_ascii_case`]
521 - [`u8::to_ascii_uppercase`]
522 - [`u8::to_ascii_lowercase`]
523 - [`u8::eq_ignore_ascii_case`]
527 - [Rustdoc lints are now treated as a tool lint, meaning that
528 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
529 Using the old style is still allowed, and will become a warning in
531 - [Rustdoc now supports argument files.][82261]
532 - [Rustdoc now generates smart punctuation for documentation.][79423]
533 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
541 - [You can now pass multiple filters to tests.][81356] E.g.
542 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
543 - [Rustup now distributes PDB symbols for the `std` library on Windows,
544 allowing you to see `std` symbols when debugging.][82218]
548 These changes provide no direct user facing benefits, but represent significant
549 improvements to the internals and overall performance of rustc and
552 - [Check the result cache before the DepGraph when ensuring queries][81855]
553 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
554 - [Only store a LocalDefId in some HIR nodes][81611]
555 - [Store HIR attributes in a side table][79519]
559 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
560 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
561 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
562 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
563 languages in code blocks.][78429]
564 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
565 - [Changes in how proc macros handle whitespace may lead to panics when used
566 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
567 - [Turn `#[derive]` into a regular macro attribute][79078]
569 [84136]: https://github.com/rust-lang/rust/issues/84136
570 [80763]: https://github.com/rust-lang/rust/pull/80763
571 [82166]: https://github.com/rust-lang/rust/pull/82166
572 [82121]: https://github.com/rust-lang/rust/pull/82121
573 [81879]: https://github.com/rust-lang/rust/pull/81879
574 [82261]: https://github.com/rust-lang/rust/pull/82261
575 [82218]: https://github.com/rust-lang/rust/pull/82218
576 [82216]: https://github.com/rust-lang/rust/pull/82216
577 [82202]: https://github.com/rust-lang/rust/pull/82202
578 [81855]: https://github.com/rust-lang/rust/pull/81855
579 [81766]: https://github.com/rust-lang/rust/pull/81766
580 [81744]: https://github.com/rust-lang/rust/pull/81744
581 [81611]: https://github.com/rust-lang/rust/pull/81611
582 [81479]: https://github.com/rust-lang/rust/pull/81479
583 [81451]: https://github.com/rust-lang/rust/pull/81451
584 [81356]: https://github.com/rust-lang/rust/pull/81356
585 [80962]: https://github.com/rust-lang/rust/pull/80962
586 [80553]: https://github.com/rust-lang/rust/pull/80553
587 [80527]: https://github.com/rust-lang/rust/pull/80527
588 [79519]: https://github.com/rust-lang/rust/pull/79519
589 [79423]: https://github.com/rust-lang/rust/pull/79423
590 [79208]: https://github.com/rust-lang/rust/pull/79208
591 [78429]: https://github.com/rust-lang/rust/pull/78429
592 [82733]: https://github.com/rust-lang/rust/pull/82733
593 [82594]: https://github.com/rust-lang/rust/pull/82594
594 [79078]: https://github.com/rust-lang/rust/pull/79078
595 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
596 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
597 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
598 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
599 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
600 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
601 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
602 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
603 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
604 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
605 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
606 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
607 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
608 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
609 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
610 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
611 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
612 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
613 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
614 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
615 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
616 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
618 Version 1.51.0 (2021-03-25)
619 ============================
623 - [You can now parameterize items such as functions, traits, and `struct`s by constant
624 values in addition to by types and lifetimes.][79135] Also known as "const generics"
625 E.g. you can now write the following. Note: Only values of primitive integers,
626 `bool`, or `char` types are currently permitted.
628 struct GenericArray<T, const LENGTH: usize> {
632 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
633 const fn last(&self) -> Option<&T> {
637 Some(&self.inner[LENGTH - 1])
647 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
648 This option controls whether debug information is split across multiple files
649 or packed into a single file. **Note** This option is unstable on other platforms.
650 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
651 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
652 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
653 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
655 \* Refer to Rust's [platform support page][platform-support-doc] for more
656 information on Rust's tiered platform support.
661 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
662 - [`str` now implements `AsMut<str>`.][80279]
663 - [`u64` and `u128` now implement `From<char>`.][79502]
664 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
665 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
666 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
667 - [`io::Empty` now implements `io::Seek`.][78044]
668 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
669 `T: ?Sized` types.][80764]
670 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
676 - [`Arc::decrement_strong_count`]
677 - [`Arc::increment_strong_count`]
678 - [`Once::call_once_force`]
679 - [`Peekable::next_if_eq`]
680 - [`Peekable::next_if`]
681 - [`Seek::stream_position`]
682 - [`array::IntoIter`]
683 - [`panic::panic_any`]
685 - [`ptr::addr_of_mut!`]
686 - [`slice::fill_with`]
687 - [`slice::split_inclusive_mut`]
688 - [`slice::split_inclusive`]
689 - [`slice::strip_prefix`]
690 - [`slice::strip_suffix`]
691 - [`str::split_inclusive`]
692 - [`sync::OnceState`]
694 - [`VecDeque::range`]
695 - [`VecDeque::range_mut`]
699 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
700 codegen option.][cargo/9112]
701 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
702 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
703 to avoid unifying features of dependencies where that unification could be unwanted.
704 Such as using the same dependency with a `std` feature in a build scripts and
705 proc-macros, while using the `no-std` feature in the final binary. See the
706 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
711 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
712 - [You can now provide a `--default-theme` flag which sets the default theme to use for
713 documentation.][79642]
715 Various improvements to intra-doc links:
717 - [You can link to non-path primitives such as `slice`.][80181]
718 - [You can link to associated items.][74489]
719 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
723 - [You can now pass `--include-ignored` to tests (e.g. with
724 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
729 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
730 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
732 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
733 for the distributed artifacts.][81521]
734 - `armv5te-unknown-linux-gnueabi`
735 - `sparc64-unknown-linux-gnu`
736 - `thumbv7neon-unknown-linux-gnueabihf`
737 - `armv7-unknown-linux-gnueabi`
738 - `x86_64-unknown-linux-gnux32`
739 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
744 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
746 [79135]: https://github.com/rust-lang/rust/pull/79135
747 [74489]: https://github.com/rust-lang/rust/pull/74489
748 [76934]: https://github.com/rust-lang/rust/pull/76934
749 [79570]: https://github.com/rust-lang/rust/pull/79570
750 [80181]: https://github.com/rust-lang/rust/pull/80181
751 [79642]: https://github.com/rust-lang/rust/pull/79642
752 [80945]: https://github.com/rust-lang/rust/pull/80945
753 [80279]: https://github.com/rust-lang/rust/pull/80279
754 [80053]: https://github.com/rust-lang/rust/pull/80053
755 [79502]: https://github.com/rust-lang/rust/pull/79502
756 [75180]: https://github.com/rust-lang/rust/pull/75180
757 [79135]: https://github.com/rust-lang/rust/pull/79135
758 [81521]: https://github.com/rust-lang/rust/pull/81521
759 [80968]: https://github.com/rust-lang/rust/pull/80968
760 [80959]: https://github.com/rust-lang/rust/pull/80959
761 [80718]: https://github.com/rust-lang/rust/pull/80718
762 [80653]: https://github.com/rust-lang/rust/pull/80653
763 [80579]: https://github.com/rust-lang/rust/pull/80579
764 [79998]: https://github.com/rust-lang/rust/pull/79998
765 [78044]: https://github.com/rust-lang/rust/pull/78044
766 [81455]: https://github.com/rust-lang/rust/pull/81455
767 [80764]: https://github.com/rust-lang/rust/pull/80764
768 [80749]: https://github.com/rust-lang/rust/pull/80749
769 [80662]: https://github.com/rust-lang/rust/pull/80662
770 [79134]: https://github.com/rust-lang/rust/pull/79134
771 [80966]: https://github.com/rust-lang/rust/pull/80966
772 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
773 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
774 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
775 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
776 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
777 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
778 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
779 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
780 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
781 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
782 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
783 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
784 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
785 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
786 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
787 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
788 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
789 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
790 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
791 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
792 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
793 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
794 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
796 Version 1.50.0 (2021-02-11)
797 ============================
800 -----------------------
801 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
802 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
803 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
806 -----------------------
807 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
808 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
809 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
810 - [Dropped support for all cloudabi targets.][78439]
812 \* Refer to Rust's [platform support page][platform-support-doc] for more
813 information on Rust's tiered platform support.
816 -----------------------
818 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
819 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
820 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
821 This value cannot be a valid file descriptor, and now means `Option<File>` takes
822 up the same amount of space as `File`.
828 - [`btree_map::Entry::or_insert_with_key`]
831 - [`hash_map::Entry::or_insert_with_key`]
835 - [`UnsafeCell::get_mut`]
837 The following previously stable methods are now `const`.
839 - [`IpAddr::is_ipv4`]
840 - [`IpAddr::is_ipv6`]
841 - [`IpAddr::is_unspecified`]
842 - [`IpAddr::is_loopback`]
843 - [`IpAddr::is_multicast`]
844 - [`Ipv4Addr::octets`]
845 - [`Ipv4Addr::is_loopback`]
846 - [`Ipv4Addr::is_private`]
847 - [`Ipv4Addr::is_link_local`]
848 - [`Ipv4Addr::is_multicast`]
849 - [`Ipv4Addr::is_broadcast`]
850 - [`Ipv4Addr::is_documentation`]
851 - [`Ipv4Addr::to_ipv6_compatible`]
852 - [`Ipv4Addr::to_ipv6_mapped`]
853 - [`Ipv6Addr::segments`]
854 - [`Ipv6Addr::is_unspecified`]
855 - [`Ipv6Addr::is_loopback`]
856 - [`Ipv6Addr::is_multicast`]
857 - [`Ipv6Addr::to_ipv4`]
860 - [`Layout::from_size_align`]
861 - `pow` for all integer types.
862 - `checked_pow` for all integer types.
863 - `saturating_pow` for all integer types.
864 - `wrapping_pow` for all integer types.
865 - `next_power_of_two` for all unsigned integer types.
866 - `checked_next_power_of_two` for all unsigned integer types.
869 -----------------------
871 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
872 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
873 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
874 contents of that directory for changes.][cargo/8973]
875 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
880 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
881 - [Running tests will now print the total time taken to execute.][75752]
886 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
887 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
888 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
889 unhygenic `macro_rules!` macros.][79472]
890 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
891 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
892 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
893 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
894 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
895 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
897 [74989]: https://github.com/rust-lang/rust/pull/74989
898 [79261]: https://github.com/rust-lang/rust/pull/79261
899 [79896]: https://github.com/rust-lang/rust/pull/79896
900 [79484]: https://github.com/rust-lang/rust/pull/79484
901 [79472]: https://github.com/rust-lang/rust/pull/79472
902 [79270]: https://github.com/rust-lang/rust/pull/79270
903 [79003]: https://github.com/rust-lang/rust/pull/79003
904 [78864]: https://github.com/rust-lang/rust/pull/78864
905 [78636]: https://github.com/rust-lang/rust/pull/78636
906 [78439]: https://github.com/rust-lang/rust/pull/78439
907 [78343]: https://github.com/rust-lang/rust/pull/78343
908 [78296]: https://github.com/rust-lang/rust/pull/78296
909 [78068]: https://github.com/rust-lang/rust/pull/78068
910 [75752]: https://github.com/rust-lang/rust/pull/75752
911 [74699]: https://github.com/rust-lang/rust/pull/74699
912 [78142]: https://github.com/rust-lang/rust/pull/78142
913 [77484]: https://github.com/rust-lang/rust/pull/77484
914 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
915 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
916 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
917 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
918 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
919 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
920 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
921 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
922 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
923 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
924 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
925 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
926 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
927 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
928 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
929 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
930 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
931 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
932 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
933 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
934 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
935 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
936 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
937 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
938 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
939 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
940 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
941 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
942 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
943 [`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
944 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
945 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
946 [`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
947 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
950 Version 1.49.0 (2020-12-31)
951 ============================
954 -----------------------
956 - [Unions can now implement `Drop`, and you can now have a field in a union
957 with `ManuallyDrop<T>`.][77547]
958 - [You can now cast uninhabited enums to integers.][76199]
959 - [You can now bind by reference and by move in patterns.][76119] This
960 allows you to selectively borrow individual components of a type. E.g.
968 let person = Person {
969 name: String::from("Alice"),
973 // `name` is moved out of person, but `age` is referenced.
974 let Person { name, ref age } = person;
975 println!("{} {}", name, age);
979 -----------------------
981 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
982 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
983 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
984 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
985 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
986 - [Output from threads spawned in tests is now captured.][78227]
987 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
989 \* Refer to Rust's [platform support page][platform-support-doc] for more
990 information on Rust's tiered platform support.
993 -----------------------
995 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
996 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1001 - [`slice::select_nth_unstable`]
1002 - [`slice::select_nth_unstable_by`]
1003 - [`slice::select_nth_unstable_by_key`]
1005 The following previously stable methods are now `const`.
1007 - [`Poll::is_ready`]
1008 - [`Poll::is_pending`]
1011 -----------------------
1012 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1013 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1014 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1015 variable will be set if the crate being built is one the user selected to build, either
1016 with `-p` or through defaults.
1017 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1023 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1024 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1025 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1026 Previously such invalid or unused attributes could be ignored.
1027 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1028 read [this post about the changes][rustdoc-ws-post] for more details.
1029 - [Trait bounds are no longer inferred for associated types.][79904]
1033 These changes provide no direct user facing benefits, but represent significant
1034 improvements to the internals and overall performance of rustc and
1037 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1038 Local Storage model.][78201]
1039 - [Calculate visibilities once in resolve.][78077]
1040 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1041 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1044 [75991]: https://github.com/rust-lang/rust/pull/75991
1045 [78951]: https://github.com/rust-lang/rust/pull/78951
1046 [78848]: https://github.com/rust-lang/rust/pull/78848
1047 [78746]: https://github.com/rust-lang/rust/pull/78746
1048 [78376]: https://github.com/rust-lang/rust/pull/78376
1049 [78228]: https://github.com/rust-lang/rust/pull/78228
1050 [78227]: https://github.com/rust-lang/rust/pull/78227
1051 [78201]: https://github.com/rust-lang/rust/pull/78201
1052 [78109]: https://github.com/rust-lang/rust/pull/78109
1053 [78077]: https://github.com/rust-lang/rust/pull/78077
1054 [77997]: https://github.com/rust-lang/rust/pull/77997
1055 [77703]: https://github.com/rust-lang/rust/pull/77703
1056 [77547]: https://github.com/rust-lang/rust/pull/77547
1057 [77015]: https://github.com/rust-lang/rust/pull/77015
1058 [76199]: https://github.com/rust-lang/rust/pull/76199
1059 [76119]: https://github.com/rust-lang/rust/pull/76119
1060 [75914]: https://github.com/rust-lang/rust/pull/75914
1061 [79004]: https://github.com/rust-lang/rust/pull/79004
1062 [78676]: https://github.com/rust-lang/rust/pull/78676
1063 [79904]: https://github.com/rust-lang/rust/issues/79904
1064 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1065 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1066 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1067 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1068 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1069 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1070 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1071 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1072 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1073 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1074 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1076 Version 1.48.0 (2020-11-19)
1077 ==========================
1082 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1083 is still rejected *semantically*, but can now be parsed by procedural macros.
1087 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1088 `rustc` whether to link its own C runtime and libraries or to rely on a external
1089 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1090 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1091 Note: If you're using cargo you must explicitly pass the `--target` flag.
1092 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1094 \* Refer to Rust's [platform support page][platform-support-doc] for more
1095 information on Rust's tiered platform support.
1099 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1100 and `&Stderr`.][76275]
1101 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1102 - [The `matches!` macro now supports having a trailing comma.][74880]
1103 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1104 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1108 - [`slice::as_ptr_range`]
1109 - [`slice::as_mut_ptr_range`]
1110 - [`VecDeque::make_contiguous`]
1111 - [`future::pending`]
1114 The following previously stable methods are now `const fn`'s:
1116 - [`Option::is_some`]
1117 - [`Option::is_none`]
1118 - [`Option::as_ref`]
1120 - [`Result::is_err`]
1121 - [`Result::as_ref`]
1122 - [`Ordering::reverse`]
1123 - [`Ordering::then`]
1130 - [You can now link to items in `rustdoc` using the intra-doc link
1131 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1132 a link to `std::future`'s documentation. See ["Linking to items by
1133 name"][intradoc-links] for more information.
1134 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1135 when searching through `rustdoc`'s UI.][75740]
1139 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1140 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1141 promoted to `'static` lifetime any more inside `const fn`s.
1142 - [Associated type bindings on trait objects are now verified to meet the bounds
1143 declared on the trait when checking that they implement the trait.][27675]
1144 - [When trait bounds on associated types or opaque types are ambiguous, the
1145 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1146 - [Fixed recursive nonterminals not being expanded in macros during
1147 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1148 correctly handling recursive nonterminal tokens.
1149 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1150 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1151 in places where they have no effect.][73461]
1152 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1153 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1154 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1155 disallow zero-initialization.][71274]
1156 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1157 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1158 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1159 see the [`catch_unwind`] documentation for further information.
1165 These changes provide no direct user facing benefits, but represent significant
1166 improvements to the internals and overall performance of rustc and
1169 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1170 You can continue building with `make` by setting `ninja=false` in
1172 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1173 - [Made `ensure_sufficient_stack()` non-generic][76680]
1175 [78143]: https://github.com/rust-lang/rust/issues/78143
1176 [76680]: https://github.com/rust-lang/rust/pull/76680/
1177 [76030]: https://github.com/rust-lang/rust/pull/76030/
1178 [70212]: https://github.com/rust-lang/rust/pull/70212/
1179 [27675]: https://github.com/rust-lang/rust/issues/27675/
1180 [54121]: https://github.com/rust-lang/rust/issues/54121/
1181 [71274]: https://github.com/rust-lang/rust/pull/71274/
1182 [77386]: https://github.com/rust-lang/rust/pull/77386/
1183 [77153]: https://github.com/rust-lang/rust/pull/77153/
1184 [77055]: https://github.com/rust-lang/rust/pull/77055/
1185 [76275]: https://github.com/rust-lang/rust/pull/76275/
1186 [76310]: https://github.com/rust-lang/rust/pull/76310/
1187 [76420]: https://github.com/rust-lang/rust/pull/76420/
1188 [76158]: https://github.com/rust-lang/rust/pull/76158/
1189 [75857]: https://github.com/rust-lang/rust/pull/75857/
1190 [75585]: https://github.com/rust-lang/rust/pull/75585/
1191 [75740]: https://github.com/rust-lang/rust/pull/75740/
1192 [75502]: https://github.com/rust-lang/rust/pull/75502/
1193 [74880]: https://github.com/rust-lang/rust/pull/74880/
1194 [74922]: https://github.com/rust-lang/rust/pull/74922/
1195 [74430]: https://github.com/rust-lang/rust/pull/74430/
1196 [74194]: https://github.com/rust-lang/rust/pull/74194/
1197 [73461]: https://github.com/rust-lang/rust/pull/73461/
1198 [73166]: https://github.com/rust-lang/rust/pull/73166/
1199 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1200 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1201 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1202 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1203 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1204 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1205 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1206 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1207 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1208 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1209 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1210 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1211 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1212 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1213 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1216 Version 1.47.0 (2020-10-08)
1217 ==========================
1221 - [Closures will now warn when not used.][74869]
1225 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1226 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1228 - [Upgraded to LLVM 11.][73526]
1229 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1230 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1231 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1233 \* Refer to Rust's [platform support page][platform-support-doc] for more
1234 information on Rust's tiered platform support.
1238 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1239 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1240 those of length less than 33.][74060]
1241 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1242 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1243 `PartialEq`, and `PartialOrd`.][73583]
1247 - [`Ident::new_raw`]
1248 - [`Range::is_empty`]
1249 - [`RangeInclusive::is_empty`]
1250 - [`Result::as_deref`]
1251 - [`Result::as_deref_mut`]
1253 - [`pointer::offset_from`]
1257 The following previously stable APIs have now been made const.
1259 - [The `new` method for all `NonZero` integers.][73858]
1260 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1261 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1262 methods for all integers.][73858]
1263 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1264 signed integers.][73858]
1265 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1266 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1267 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1268 `is_ascii_control` methods for `char` and `u8`.][73858]
1272 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1273 You can override this by setting the following in your `Cargo.toml`.
1275 [profile.release.build-override]
1278 - [`cargo-help` will now display man pages for commands rather just the
1279 `--help` text.][cargo/8456]
1280 - [`cargo-metadata` now emits a `test` field indicating if a target has
1281 tests enabled.][cargo/8478]
1282 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1283 - [`cargo-publish` will now use an alternative registry by default if it's the
1284 only registry specified in `package.publish`.][cargo/8571]
1288 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1289 type based search.][75366]
1290 - [Added the Ayu theme to rustdoc.][71237]
1294 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1295 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1296 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1297 help to preserve more span information.][73084] These changes may cause
1298 compiliation errors if your macro was unhygenic or didn't correctly handle
1300 - [Moved support for the CloudABI target to tier 3.][75568]
1301 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1302 - [Added the `rustc-docs` component.][75560] This allows you to install
1303 and read the documentation for the compiler internal APIs. (Currently only
1304 available for `x86_64-unknown-linux-gnu`.)
1309 - [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.
1311 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1312 [75048]: https://github.com/rust-lang/rust/pull/75048/
1313 [74163]: https://github.com/rust-lang/rust/pull/74163/
1314 [71237]: https://github.com/rust-lang/rust/pull/71237/
1315 [74869]: https://github.com/rust-lang/rust/pull/74869/
1316 [73858]: https://github.com/rust-lang/rust/pull/73858/
1317 [75716]: https://github.com/rust-lang/rust/pull/75716/
1318 [75908]: https://github.com/rust-lang/rust/pull/75908/
1319 [75516]: https://github.com/rust-lang/rust/pull/75516/
1320 [75560]: https://github.com/rust-lang/rust/pull/75560/
1321 [75568]: https://github.com/rust-lang/rust/pull/75568/
1322 [75366]: https://github.com/rust-lang/rust/pull/75366/
1323 [75204]: https://github.com/rust-lang/rust/pull/75204/
1324 [74650]: https://github.com/rust-lang/rust/pull/74650/
1325 [74419]: https://github.com/rust-lang/rust/pull/74419/
1326 [73964]: https://github.com/rust-lang/rust/pull/73964/
1327 [74021]: https://github.com/rust-lang/rust/pull/74021/
1328 [74060]: https://github.com/rust-lang/rust/pull/74060/
1329 [73893]: https://github.com/rust-lang/rust/pull/73893/
1330 [73526]: https://github.com/rust-lang/rust/pull/73526/
1331 [73583]: https://github.com/rust-lang/rust/pull/73583/
1332 [73084]: https://github.com/rust-lang/rust/pull/73084/
1333 [73197]: https://github.com/rust-lang/rust/pull/73197/
1334 [72488]: https://github.com/rust-lang/rust/pull/72488/
1335 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1336 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1337 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1338 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1339 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1340 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1341 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1342 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1343 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1344 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1345 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1346 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1347 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1348 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1349 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1352 Version 1.46.0 (2020-08-27)
1353 ==========================
1357 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1358 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1359 const functions.][73862]
1360 - [The `#[track_caller]` attribute can now be added to functions to use the
1361 function's caller's location information for panic messages.][72445]
1362 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1363 `x.0.0` over `(x.0).0`.
1364 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1365 You currently can't use `mem::transmute` in constant functions.
1369 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1370 - [Enabled static "Position Independent Executables" by default
1371 for `x86_64-unknown-linux-musl`.][70740]
1375 - [`mem::forget` is now a `const fn`.][73887]
1376 - [`String` now implements `From<char>`.][73466]
1377 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1378 integer types.][73032]
1379 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1380 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1381 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1382 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1383 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1384 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1389 - [`vec::Drain::as_slice`]
1393 Added a number of new environment variables that are now available when
1394 compiling your crate.
1396 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1397 the specific binary being compiled and the name of the crate.
1398 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1399 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1403 - [The target configuration option `abi_blacklist` has been renamed
1404 to `unsupported_abis`.][74150] The old name will still continue to work.
1405 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1406 This was previously accepted but will become a hard error in a future release.
1407 - [Rustc will fail to compile if you have a struct with
1408 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1410 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1411 ensure that spans have the correct information, and may cause breakage if you
1412 were relying on receiving spans with dummy information.
1413 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1414 a legacy installer that was replaced by a MSI installer a few years ago but
1415 was still being built.
1416 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1417 - [Rustc will no longer accept overlapping trait implementations that only
1418 differ in how the lifetime was bound.][72493]
1419 - [Rustc now correctly relates the lifetime of an existential associated
1420 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1421 you to pass a shorter lifetime than expected.
1422 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1423 The library will need to be installed for `rustc` to work, even though we
1424 expect it to be already available on most systems.
1425 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1427 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1428 exact output returned by rustc's pretty printing is an unstable
1429 implementation detail: we recommend any macro relying on it to switch to a
1430 more robust parsing system.
1432 [75453]: https://github.com/rust-lang/rust/issues/75453/
1433 [74820]: https://github.com/rust-lang/rust/issues/74820/
1434 [74420]: https://github.com/rust-lang/rust/issues/74420/
1435 [74109]: https://github.com/rust-lang/rust/pull/74109/
1436 [74150]: https://github.com/rust-lang/rust/pull/74150/
1437 [73862]: https://github.com/rust-lang/rust/pull/73862/
1438 [73887]: https://github.com/rust-lang/rust/pull/73887/
1439 [73466]: https://github.com/rust-lang/rust/pull/73466/
1440 [73516]: https://github.com/rust-lang/rust/pull/73516/
1441 [73293]: https://github.com/rust-lang/rust/pull/73293/
1442 [73007]: https://github.com/rust-lang/rust/pull/73007/
1443 [73032]: https://github.com/rust-lang/rust/pull/73032/
1444 [72920]: https://github.com/rust-lang/rust/pull/72920/
1445 [72569]: https://github.com/rust-lang/rust/pull/72569/
1446 [72583]: https://github.com/rust-lang/rust/pull/72583/
1447 [72584]: https://github.com/rust-lang/rust/pull/72584/
1448 [72717]: https://github.com/rust-lang/rust/pull/72717/
1449 [72437]: https://github.com/rust-lang/rust/pull/72437/
1450 [72445]: https://github.com/rust-lang/rust/pull/72445/
1451 [72486]: https://github.com/rust-lang/rust/pull/72486/
1452 [72493]: https://github.com/rust-lang/rust/pull/72493/
1453 [72331]: https://github.com/rust-lang/rust/pull/72331/
1454 [71896]: https://github.com/rust-lang/rust/pull/71896/
1455 [71660]: https://github.com/rust-lang/rust/pull/71660/
1456 [71322]: https://github.com/rust-lang/rust/pull/71322/
1457 [70740]: https://github.com/rust-lang/rust/pull/70740/
1458 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1459 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1460 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1461 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1462 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1465 Version 1.45.2 (2020-08-03)
1466 ==========================
1468 * [Fix bindings in tuple struct patterns][74954]
1469 * [Fix track_caller integration with trait objects][74784]
1471 [74954]: https://github.com/rust-lang/rust/issues/74954
1472 [74784]: https://github.com/rust-lang/rust/issues/74784
1475 Version 1.45.1 (2020-07-30)
1476 ==========================
1478 * [Fix const propagation with references.][73613]
1479 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1480 * [Avoid spurious implicit region bound.][74509]
1481 * [Install clippy on x.py install][74457]
1483 [73613]: https://github.com/rust-lang/rust/pull/73613
1484 [73078]: https://github.com/rust-lang/rust/issues/73078
1485 [74509]: https://github.com/rust-lang/rust/pull/74509
1486 [74457]: https://github.com/rust-lang/rust/pull/74457
1489 Version 1.45.0 (2020-07-16)
1490 ==========================
1494 - [Out of range float to int conversions using `as` has been defined as a saturating
1495 conversion.][71269] This was previously undefined behaviour, but you can use the
1496 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1497 may be desirable in rare performance sensitive situations.
1498 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1499 using `u64`.][70705]
1500 - [Function like procedural macros can now be used in expression, pattern, and statement
1501 positions.][68717] This means you can now use a function-like procedural macro
1502 anywhere you can use a declarative (`macro_rules!`) macro.
1506 - [You can now override individual target features through the `target-feature`
1507 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1508 equivalent to `-C target-feature=+avx2,+fma`.
1509 - [Added the `force-unwind-tables` flag.][69984] This option allows
1510 rustc to always generate unwind tables regardless of panic strategy.
1511 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1512 to include LLVM bitcode into generated `rlib`s (this is on by default).
1513 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1514 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1515 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1516 - [Upgraded to LLVM 10.][67759]
1518 \* Refer to Rust's [platform support page][platform-support-doc] for more
1519 information on Rust's tiered platform support.
1524 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1526 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1527 - [You can now use `char` with
1528 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1529 a range of codepoints.][72413] E.g.
1530 you can now write the following;
1532 for ch in 'a'..='z' {
1536 // Prints "abcdefghijklmnopqrstuvwxyz"
1538 - [`OsString` now implements `FromStr`.][71662]
1539 - [The `saturating_neg` method has been added to all signed integer primitive
1540 types, and the `saturating_abs` method has been added for all integer
1541 primitive types.][71886]
1542 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1543 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1545 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1546 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1547 integer types.][69813]
1548 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1549 integer types.][72324]
1550 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1555 - [`BTreeMap::remove_entry`]
1557 - [`rc::Weak::as_ptr`]
1558 - [`rc::Weak::from_raw`]
1559 - [`rc::Weak::into_raw`]
1560 - [`str::strip_prefix`]
1561 - [`str::strip_suffix`]
1562 - [`sync::Weak::as_ptr`]
1563 - [`sync::Weak::from_raw`]
1564 - [`sync::Weak::into_raw`]
1565 - [`char::UNICODE_VERSION`]
1566 - [`Span::resolved_at`]
1567 - [`Span::located_at`]
1568 - [`Span::mixed_site`]
1569 - [`unix::process::CommandExt::arg0`]
1574 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1579 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1580 `~~outdated information~~` becomes "~~outdated information~~".
1581 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1585 - [Trying to self initialize a static value (that is creating a value using
1586 itself) is unsound and now causes a compile error.][71140]
1587 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1588 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1589 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1590 previously undocumented and not intended for public use. Rustdoc still provides
1591 a non-zero exit code on errors.
1592 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1593 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1594 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1595 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1596 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1600 - [Make clippy a git subtree instead of a git submodule][70655]
1601 - [Unify the undo log of all snapshot types][69464]
1603 [71848]: https://github.com/rust-lang/rust/issues/71848/
1604 [73420]: https://github.com/rust-lang/rust/issues/73420/
1605 [72324]: https://github.com/rust-lang/rust/pull/72324/
1606 [71843]: https://github.com/rust-lang/rust/pull/71843/
1607 [71886]: https://github.com/rust-lang/rust/pull/71886/
1608 [72234]: https://github.com/rust-lang/rust/pull/72234/
1609 [72239]: https://github.com/rust-lang/rust/pull/72239/
1610 [72397]: https://github.com/rust-lang/rust/pull/72397/
1611 [72413]: https://github.com/rust-lang/rust/pull/72413/
1612 [72014]: https://github.com/rust-lang/rust/pull/72014/
1613 [72062]: https://github.com/rust-lang/rust/pull/72062/
1614 [72094]: https://github.com/rust-lang/rust/pull/72094/
1615 [72133]: https://github.com/rust-lang/rust/pull/72133/
1616 [67759]: https://github.com/rust-lang/rust/pull/67759/
1617 [71900]: https://github.com/rust-lang/rust/pull/71900/
1618 [71928]: https://github.com/rust-lang/rust/pull/71928/
1619 [71662]: https://github.com/rust-lang/rust/pull/71662/
1620 [71716]: https://github.com/rust-lang/rust/pull/71716/
1621 [71447]: https://github.com/rust-lang/rust/pull/71447/
1622 [71269]: https://github.com/rust-lang/rust/pull/71269/
1623 [71095]: https://github.com/rust-lang/rust/pull/71095/
1624 [71140]: https://github.com/rust-lang/rust/pull/71140/
1625 [70655]: https://github.com/rust-lang/rust/pull/70655/
1626 [70705]: https://github.com/rust-lang/rust/pull/70705/
1627 [69984]: https://github.com/rust-lang/rust/pull/69984/
1628 [69813]: https://github.com/rust-lang/rust/pull/69813/
1629 [69464]: https://github.com/rust-lang/rust/pull/69464/
1630 [68717]: https://github.com/rust-lang/rust/pull/68717/
1631 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1632 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1633 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1634 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1635 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1636 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1637 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1638 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1639 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1640 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1641 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1642 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1643 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1644 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1645 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1646 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1647 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1650 Version 1.44.1 (2020-06-18)
1651 ===========================
1653 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1654 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1655 * [Fix crashes when finding backtrace on macOS.][71397]
1656 * [Clippy applies lint levels into different files.][clippy/5356]
1658 [71397]: https://github.com/rust-lang/rust/issues/71397
1659 [73078]: https://github.com/rust-lang/rust/issues/73078
1660 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1661 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1664 Version 1.44.0 (2020-06-04)
1665 ==========================
1669 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1670 - [Added the `unused_braces` lint.][70081]
1672 **Syntax-only changes**
1674 - [Expansion-driven outline module parsing][69838]
1679 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1684 These are still rejected semantically, so you will likely receive an error but
1685 these changes can be seen and parsed by macros and conditional compilation.
1689 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1690 Additionally when in incremental mode rustc defaults to 256 codegen units.
1691 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1692 a panic is thrown.][67502]
1693 - [Added tier 3\* support for the `aarch64-unknown-none` and
1694 `aarch64-unknown-none-softfloat` targets.][68334]
1695 - [Added tier 3 support for `arm64-apple-tvos` and
1696 `x86_64-apple-tvos` targets.][68191]
1701 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1702 `vec![]` to be able to be used in `const` contexts.
1703 - [`convert::Infallible` now implements `Hash`.][70281]
1704 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1705 a `&mut OsStr`.][70048]
1706 - [Unicode 13 is now supported.][69929]
1707 - [`String` now implements `From<&mut str>`.][69661]
1708 - [`IoSlice` now implements `Copy`.][69403]
1709 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1710 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1711 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1712 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1713 integer types.][69373]
1717 - [`PathBuf::with_capacity`]
1718 - [`PathBuf::capacity`]
1719 - [`PathBuf::clear`]
1720 - [`PathBuf::reserve`]
1721 - [`PathBuf::reserve_exact`]
1722 - [`PathBuf::shrink_to_fit`]
1723 - [`f32::to_int_unchecked`]
1724 - [`f64::to_int_unchecked`]
1725 - [`Layout::align_to`]
1726 - [`Layout::pad_to_align`]
1728 - [`Layout::extend`]
1732 - [Added the `cargo tree` command which will print a tree graph of
1733 your dependencies.][cargo/8062] E.g.
1735 mdbook v0.3.2 (/Users/src/rust/mdbook)
1737 │ ├── html5ever v0.24.0
1739 │ │ │ └── cfg-if v0.1.9
1741 │ │ └── markup5ever v0.9.0
1742 │ │ ├── log v0.4.8 (*)
1744 │ │ │ └── phf_shared v0.7.24
1745 │ │ │ ├── siphasher v0.2.3
1746 │ │ │ └── unicase v1.4.2
1747 │ │ │ [build-dependencies]
1748 │ │ │ └── version_check v0.1.5
1751 You can also display dependencies on multiple versions of the same crate with
1752 `cargo tree -d` (short for `cargo tree --duplicates`).
1756 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1757 the version in the sidebar.][69494]
1761 - [Rustc now correctly generates static libraries on Windows GNU targets with
1762 the `.a` extension, rather than the previous `.lib`.][70937]
1763 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1764 - [The `file_name` property in JSON output of macro errors now points the actual
1765 source file rather than the previous format of `<NAME macros>`.][70969]
1766 **Note:** this may not point to a file that actually exists on the user's system.
1767 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1768 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1769 not allow zero initialization such as `NonZeroU8`.][66059] This was
1770 previously a warning.
1771 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1772 operator has been defined as a saturating operation.][71269] This was previously
1773 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1774 continue using the current behaviour, which may be desirable in rare performance
1775 sensitive situations.
1779 These changes provide no direct user facing benefits, but represent significant
1780 improvements to the internals and overall performance of rustc and
1783 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1784 - [Replace big JS dict with JSON parsing.][71250]
1786 [69373]: https://github.com/rust-lang/rust/pull/69373/
1787 [66059]: https://github.com/rust-lang/rust/pull/66059/
1788 [68191]: https://github.com/rust-lang/rust/pull/68191/
1789 [68899]: https://github.com/rust-lang/rust/pull/68899/
1790 [71147]: https://github.com/rust-lang/rust/pull/71147/
1791 [71250]: https://github.com/rust-lang/rust/pull/71250/
1792 [70937]: https://github.com/rust-lang/rust/pull/70937/
1793 [70969]: https://github.com/rust-lang/rust/pull/70969/
1794 [70632]: https://github.com/rust-lang/rust/pull/70632/
1795 [70281]: https://github.com/rust-lang/rust/pull/70281/
1796 [70345]: https://github.com/rust-lang/rust/pull/70345/
1797 [70048]: https://github.com/rust-lang/rust/pull/70048/
1798 [70081]: https://github.com/rust-lang/rust/pull/70081/
1799 [70156]: https://github.com/rust-lang/rust/pull/70156/
1800 [71269]: https://github.com/rust-lang/rust/pull/71269/
1801 [69838]: https://github.com/rust-lang/rust/pull/69838/
1802 [69929]: https://github.com/rust-lang/rust/pull/69929/
1803 [69661]: https://github.com/rust-lang/rust/pull/69661/
1804 [69778]: https://github.com/rust-lang/rust/pull/69778/
1805 [69494]: https://github.com/rust-lang/rust/pull/69494/
1806 [69403]: https://github.com/rust-lang/rust/pull/69403/
1807 [69033]: https://github.com/rust-lang/rust/pull/69033/
1808 [68692]: https://github.com/rust-lang/rust/pull/68692/
1809 [68334]: https://github.com/rust-lang/rust/pull/68334/
1810 [67502]: https://github.com/rust-lang/rust/pull/67502/
1811 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1812 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1813 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1814 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1815 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1816 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1817 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1818 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1819 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1820 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1821 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1822 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1823 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1826 Version 1.43.1 (2020-05-07)
1827 ===========================
1829 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1830 * [Fixed the stabilization of AVX-512 features.][71473]
1831 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1833 [71430]: https://github.com/rust-lang/rust/pull/71430
1834 [71473]: https://github.com/rust-lang/rust/issues/71473
1835 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1838 Version 1.43.0 (2020-04-23)
1839 ==========================
1843 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1844 the type inferred correctly.][68129]
1845 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1847 **Syntax only changes**
1848 - [Allow `type Foo: Ord` syntactically.][69361]
1849 - [Fuse associated and extern items up to defaultness.][69194]
1850 - [Syntactically allow `self` in all `fn` contexts.][68764]
1851 - [Merge `fn` syntax + cleanup item parsing.][68728]
1852 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1853 For example, you may now write:
1855 macro_rules! mac_trait {
1865 These are still rejected *semantically*, so you will likely receive an error but
1866 these changes can be seen and parsed by macros and
1867 conditional compilation.
1872 - [You can now pass multiple lint flags to rustc to override the previous
1873 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1874 everything in the `unused` lint group except `unused-variables` which
1875 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1876 everything in the `unused` lint group **including** `unused-variables` since
1877 the allow flag is specified before the deny flag (and therefore overridden).
1878 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1879 if they are available on `windows-gnu`.][67429]
1880 - [rustc now buffers errors/warnings printed in JSON.][69227]
1884 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1885 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1886 respectively.][69538] **Note** These conversions are only available when `N`
1888 - [You can now use associated constants on floats and integers directly, rather
1889 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1890 `f32::NAN` with no imports.
1891 - [`u8::is_ascii` is now `const`.][68984]
1892 - [`String` now implements `AsMut<str>`.][68742]
1893 - [Added the `primitive` module to `std` and `core`.][67637] This module
1894 reexports Rust's primitive types. This is mainly useful in macros
1895 where you want avoid these types being shadowed.
1896 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1897 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1901 - [`Once::is_completed`]
1906 - [`iter::once_with`]
1910 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1911 your environment.][cargo/7823]
1912 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1913 executable path when running integration tests or benchmarks.][cargo/7697]
1914 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1915 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1919 - [Certain checks in the `const_err` lint were deemed unrelated to const
1920 evaluation][69185], and have been moved to the `unconditional_panic` and
1921 `arithmetic_overflow` lints.
1926 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1927 has been a warning since 1.36.0.
1928 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1929 led to some instances being accepted, and now correctly emits a hard error.
1931 [69340]: https://github.com/rust-lang/rust/pull/69340
1935 These changes provide no direct user facing benefits, but represent significant
1936 improvements to the internals and overall performance of `rustc` and
1939 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1940 - [Improved how rustc generates drop code.][67332]
1941 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1942 - [traits: preallocate 2 Vecs of known initial size][69022]
1943 - [Avoid exponential behaviour when relating types][68772]
1944 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1945 - [Improve performance of coherence checks][68966]
1946 - [Deduplicate types in the generator witness][68672]
1947 - [Invert control in struct_lint_level.][68725]
1949 [67332]: https://github.com/rust-lang/rust/pull/67332/
1950 [67429]: https://github.com/rust-lang/rust/pull/67429/
1951 [67637]: https://github.com/rust-lang/rust/pull/67637/
1952 [67642]: https://github.com/rust-lang/rust/pull/67642/
1953 [67878]: https://github.com/rust-lang/rust/pull/67878/
1954 [67885]: https://github.com/rust-lang/rust/pull/67885/
1955 [68129]: https://github.com/rust-lang/rust/pull/68129/
1956 [68672]: https://github.com/rust-lang/rust/pull/68672/
1957 [68725]: https://github.com/rust-lang/rust/pull/68725/
1958 [68728]: https://github.com/rust-lang/rust/pull/68728/
1959 [68738]: https://github.com/rust-lang/rust/pull/68738/
1960 [68742]: https://github.com/rust-lang/rust/pull/68742/
1961 [68764]: https://github.com/rust-lang/rust/pull/68764/
1962 [68772]: https://github.com/rust-lang/rust/pull/68772/
1963 [68943]: https://github.com/rust-lang/rust/pull/68943/
1964 [68952]: https://github.com/rust-lang/rust/pull/68952/
1965 [68966]: https://github.com/rust-lang/rust/pull/68966/
1966 [68984]: https://github.com/rust-lang/rust/pull/68984/
1967 [69022]: https://github.com/rust-lang/rust/pull/69022/
1968 [69185]: https://github.com/rust-lang/rust/pull/69185/
1969 [69194]: https://github.com/rust-lang/rust/pull/69194/
1970 [69201]: https://github.com/rust-lang/rust/pull/69201/
1971 [69227]: https://github.com/rust-lang/rust/pull/69227/
1972 [69548]: https://github.com/rust-lang/rust/pull/69548/
1973 [69256]: https://github.com/rust-lang/rust/pull/69256/
1974 [69361]: https://github.com/rust-lang/rust/pull/69361/
1975 [69366]: https://github.com/rust-lang/rust/pull/69366/
1976 [69538]: https://github.com/rust-lang/rust/pull/69538/
1977 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1978 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1979 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1980 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1981 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1982 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1983 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1984 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1987 Version 1.42.0 (2020-03-12)
1988 ==========================
1992 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1994 fn foo(words: &[&str]) {
1996 ["Hello", "World", "!", ..] => println!("Hello World!"),
1997 ["Foo", "Bar", ..] => println!("Baz"),
1998 rest => println!("{:?}", rest),
2002 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2003 that you can create an enum that has the exact layout and ABI of the type
2005 - [You can now use outer attribute procedural macros on inline modules.][64273]
2006 - [There are some *syntax-only* changes:][67131]
2007 - `default` is syntactically allowed before items in `trait` definitions.
2008 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2009 leave out their bodies in favor of `;`.
2010 - Bounds on associated types in `impl`s are now syntactically allowed
2011 (e.g. `type Foo: Ord;`).
2012 - `...` (the C-variadic type) may occur syntactically directly as the type of
2013 any function parameter.
2015 These are still rejected *semantically*, so you will likely receive an error
2016 but these changes can be seen and parsed by procedural macros and
2017 conditional compilation.
2021 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2022 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2023 - [`Option::{expect,unwrap}` and
2024 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2025 pointing to the location where they were called, rather than
2026 `core`'s internals. ][67887]
2028 \* Refer to Rust's [platform support page][platform-support-doc] for more
2029 information on Rust's tiered platform support.
2033 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2034 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2035 to implement `Sized`.][67935]
2036 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2037 - [`Layout::new` is now `const`.][66254]
2038 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2043 - [`CondVar::wait_while`]
2044 - [`CondVar::wait_timeout_while`]
2046 - [`DebugMap::value`]
2047 - [`ManuallyDrop::take`]
2049 - [`ptr::slice_from_raw_parts_mut`]
2050 - [`ptr::slice_from_raw_parts`]
2054 - [You no longer need to include `extern crate proc_macro;` to be able to
2055 `use proc_macro;` in the `2018` edition.][cargo/7700]
2059 - [`Error::description` has been deprecated, and its use will now produce a
2060 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2062 [68253]: https://github.com/rust-lang/rust/pull/68253/
2063 [68348]: https://github.com/rust-lang/rust/pull/68348/
2064 [67935]: https://github.com/rust-lang/rust/pull/67935/
2065 [68339]: https://github.com/rust-lang/rust/pull/68339/
2066 [68122]: https://github.com/rust-lang/rust/pull/68122/
2067 [64273]: https://github.com/rust-lang/rust/pull/64273/
2068 [67712]: https://github.com/rust-lang/rust/pull/67712/
2069 [67887]: https://github.com/rust-lang/rust/pull/67887/
2070 [67131]: https://github.com/rust-lang/rust/pull/67131/
2071 [67233]: https://github.com/rust-lang/rust/pull/67233/
2072 [66899]: https://github.com/rust-lang/rust/pull/66899/
2073 [66919]: https://github.com/rust-lang/rust/pull/66919/
2074 [66254]: https://github.com/rust-lang/rust/pull/66254/
2075 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2076 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2077 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2078 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2079 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2080 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2081 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2082 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2083 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2086 Version 1.41.1 (2020-02-27)
2087 ===========================
2089 * [Always check types of static items][69145]
2090 * [Always check lifetime bounds of `Copy` impls][69145]
2091 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2093 [69225]: https://github.com/rust-lang/rust/issues/69225
2094 [69145]: https://github.com/rust-lang/rust/pull/69145
2097 Version 1.41.0 (2020-01-30)
2098 ===========================
2103 - [You can now pass type parameters to foreign items when implementing
2104 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2105 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2106 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2107 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2108 - [You can now use any valid identifier in a `format_args` macro.][66847]
2109 Previously identifiers starting with an underscore were not allowed.
2110 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2111 enum variants.][66183] These are still rejected semantically, but
2112 can be seen and parsed by procedural macros and conditional compilation.
2117 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2118 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2119 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2120 - [You can now pass an arguments file passing the `@path` syntax
2121 to rustc.][66172] Note that the format differs somewhat from what is
2122 found in other tooling; please see [the documentation][argfile-docs] for
2124 - [You can now provide `--extern` flag without a path, indicating that it is
2125 available from the search path or specified with an `-L` flag.][64882]
2127 \* Refer to Rust's [platform support page][platform-support-doc] for more
2128 information on Rust's tiered platform support.
2130 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2135 - [The `core::panic` module is now stable.][66771] It was already stable
2137 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2138 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2139 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2144 - [`Result::map_or`]
2145 - [`Result::map_or_else`]
2146 - [`std::rc::Weak::weak_count`]
2147 - [`std::rc::Weak::strong_count`]
2148 - [`std::sync::Weak::weak_count`]
2149 - [`std::sync::Weak::strong_count`]
2154 - [Cargo will now document all the private items for binary crates
2155 by default.][cargo/7593]
2156 - [`cargo-install` will now reinstall the package if it detects that it is out
2157 of date.][cargo/7560]
2158 - [Cargo.lock now uses a more git friendly format that should help to reduce
2159 merge conflicts.][cargo/7579]
2160 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2161 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2162 optimisation level to `2` for debug builds. You can also use
2163 `[profile.<profile>.build-override]` to override build scripts and
2169 - [You can now specify `edition` in documentation code blocks to compile the block
2170 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2171 should be compiled the 2018 edition of Rust.
2172 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2173 current theme with `--check-theme`.][54733]
2174 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2179 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2180 Apple targets.][apple-32bit-drop] This means that the source code is still
2181 available to build, but the targets are no longer being tested and release
2182 binaries for those platforms will no longer be distributed by the Rust project.
2183 Please refer to the linked blog post for more information.
2185 [54733]: https://github.com/rust-lang/rust/pull/54733/
2186 [61351]: https://github.com/rust-lang/rust/pull/61351/
2187 [67255]: https://github.com/rust-lang/rust/pull/67255/
2188 [66661]: https://github.com/rust-lang/rust/pull/66661/
2189 [66771]: https://github.com/rust-lang/rust/pull/66771/
2190 [66847]: https://github.com/rust-lang/rust/pull/66847/
2191 [66238]: https://github.com/rust-lang/rust/pull/66238/
2192 [66277]: https://github.com/rust-lang/rust/pull/66277/
2193 [66325]: https://github.com/rust-lang/rust/pull/66325/
2194 [66172]: https://github.com/rust-lang/rust/pull/66172/
2195 [66183]: https://github.com/rust-lang/rust/pull/66183/
2196 [65879]: https://github.com/rust-lang/rust/pull/65879/
2197 [65013]: https://github.com/rust-lang/rust/pull/65013/
2198 [64882]: https://github.com/rust-lang/rust/pull/64882/
2199 [64325]: https://github.com/rust-lang/rust/pull/64325/
2200 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2201 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2202 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2203 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2204 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2205 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2206 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2207 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2208 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2209 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2210 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2212 Version 1.40.0 (2019-12-19)
2213 ===========================
2217 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2218 `const` contexts.][65188] e.g.
2221 pub struct Point(i32, i32);
2223 const ORIGIN: Point = {
2224 let constructor = Point;
2230 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2231 indicate that there may be variants or fields added in the future.][64639]
2232 For example this requires adding a wild-card branch (`_ => {}`) to any match
2233 statements on a non-exhaustive `enum`. [(RFC 2008)]
2234 - [You can now use function-like procedural macros in `extern` blocks and in
2235 type positions.][63931] e.g. `type Generated = macro!();`
2236 - [Function-like and attribute procedural macros can now emit
2237 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2238 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2239 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2240 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2244 - [Added tier 3 support\* for the
2245 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2246 - [Added tier 3 support for the
2247 `aarch64-unknown-none-softfloat` target.][64589]
2248 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2249 `mips64el-unknown-linux-muslabi64` targets.][65843]
2251 \* Refer to Rust's [platform support page][platform-support-doc] for more
2252 information on Rust's tiered platform support.
2256 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2260 - [`BTreeMap::get_key_value`]
2261 - [`HashMap::get_key_value`]
2262 - [`Option::as_deref_mut`]
2263 - [`Option::as_deref`]
2264 - [`Option::flatten`]
2265 - [`UdpSocket::peer_addr`]
2266 - [`f32::to_be_bytes`]
2267 - [`f32::to_le_bytes`]
2268 - [`f32::to_ne_bytes`]
2269 - [`f64::to_be_bytes`]
2270 - [`f64::to_le_bytes`]
2271 - [`f64::to_ne_bytes`]
2272 - [`f32::from_be_bytes`]
2273 - [`f32::from_le_bytes`]
2274 - [`f32::from_ne_bytes`]
2275 - [`f64::from_be_bytes`]
2276 - [`f64::from_le_bytes`]
2277 - [`f64::from_ne_bytes`]
2284 - [Cargo will now always display warnings, rather than only on
2285 fresh builds.][cargo/7450]
2286 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2287 now produce an error.][cargo/7507] Previously these flags were ignored.
2288 - [You can now publish `dev-dependencies` without including
2289 a `version`.][cargo/7333]
2293 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2294 when running documentation tests with `rustdoc`.][63803]
2298 - [As previously announced, any previous NLL warnings in the 2015 edition are
2299 now hard errors.][64221]
2300 - [The `include!` macro will now warn if it failed to include the
2301 entire file.][64284] The `include!` macro unintentionally only includes the
2302 first _expression_ in a file, and this can be unintuitive. This will become
2303 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2304 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2305 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2306 or `extern` blocks now correctly emits a hard error.
2308 [65294]: https://github.com/rust-lang/rust/pull/65294/
2309 [66103]: https://github.com/rust-lang/rust/pull/66103/
2310 [65843]: https://github.com/rust-lang/rust/pull/65843/
2311 [65188]: https://github.com/rust-lang/rust/pull/65188/
2312 [65092]: https://github.com/rust-lang/rust/pull/65092/
2313 [64589]: https://github.com/rust-lang/rust/pull/64589/
2314 [64639]: https://github.com/rust-lang/rust/pull/64639/
2315 [64221]: https://github.com/rust-lang/rust/pull/64221/
2316 [64284]: https://github.com/rust-lang/rust/pull/64284/
2317 [63931]: https://github.com/rust-lang/rust/pull/63931/
2318 [64035]: https://github.com/rust-lang/rust/pull/64035/
2319 [63674]: https://github.com/rust-lang/rust/pull/63674/
2320 [63803]: https://github.com/rust-lang/rust/pull/63803/
2321 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2322 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2323 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2324 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2325 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2326 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2327 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2328 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2329 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2330 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2331 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2332 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2333 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2334 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2335 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2336 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2337 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2338 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2339 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2340 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2341 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2342 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2343 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2344 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2345 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2346 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2349 Version 1.39.0 (2019-11-07)
2350 ===========================
2354 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2355 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2356 - [You can now use certain attributes on function, closure, and function pointer
2357 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2358 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2359 attributes applied to items. e.g.
2362 #[cfg(windows)] slice: &[u16],
2363 #[cfg(not(windows))] slice: &[u8],
2368 - [You can now take shared references to bind-by-move patterns in the `if` guards
2369 of `match` arms.][63118] e.g.
2372 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2376 // ---- `nums` is bound by move.
2377 if nums.iter().sum::<u8>() == 10
2378 // ^------ `.iter()` implicitly takes a reference to `nums`.
2381 // ----------- Legal as `nums` was bound by move and so we have ownership.
2383 _ => unreachable!(),
2392 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2393 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2394 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2395 **Note** Cargo currently doesn't use this feature. Refer to
2396 [cargo#7315][cargo/7315] to track this feature's progress.
2397 - [You can now pass `--show-output` argument to test binaries to print the
2398 output of successful tests.][62600]
2401 \* Refer to Rust's [platform support page][platform-support-doc] for more
2402 information on Rust's tiered platform support.
2406 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2407 - [`LinkedList::new` is now a `const` function.][63684]
2408 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2409 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2410 now `const`.][63786]
2414 - [`Pin::into_inner`]
2415 - [`Instant::checked_duration_since`]
2416 - [`Instant::saturating_duration_since`]
2420 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2421 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2422 `--all` is now deprecated.
2426 - [You can now pass `-Clinker` to rustdoc to control the linker used
2427 for compiling doctests.][63834]
2431 - [Code that was previously accepted by the old borrow checker, but rejected by
2432 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2433 previously a warning, and will also become a hard error in the Rust 2015
2434 edition in the 1.40.0 release.
2435 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2436 run tests.][63827] This should improve performance when running a large
2438 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2439 recommended to use the `?` operator instead.
2440 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2443 [62600]: https://github.com/rust-lang/rust/pull/62600/
2444 [62672]: https://github.com/rust-lang/rust/pull/62672/
2445 [63118]: https://github.com/rust-lang/rust/pull/63118/
2446 [63209]: https://github.com/rust-lang/rust/pull/63209/
2447 [63402]: https://github.com/rust-lang/rust/pull/63402/
2448 [63565]: https://github.com/rust-lang/rust/pull/63565/
2449 [63595]: https://github.com/rust-lang/rust/pull/63595/
2450 [63684]: https://github.com/rust-lang/rust/pull/63684/
2451 [63698]: https://github.com/rust-lang/rust/pull/63698/
2452 [63770]: https://github.com/rust-lang/rust/pull/63770/
2453 [63786]: https://github.com/rust-lang/rust/pull/63786/
2454 [63827]: https://github.com/rust-lang/rust/pull/63827/
2455 [63834]: https://github.com/rust-lang/rust/pull/63834/
2456 [63927]: https://github.com/rust-lang/rust/pull/63927/
2457 [63933]: https://github.com/rust-lang/rust/pull/63933/
2458 [63934]: https://github.com/rust-lang/rust/pull/63934/
2459 [63938]: https://github.com/rust-lang/rust/pull/63938/
2460 [63940]: https://github.com/rust-lang/rust/pull/63940/
2461 [63941]: https://github.com/rust-lang/rust/pull/63941/
2462 [63945]: https://github.com/rust-lang/rust/pull/63945/
2463 [64010]: https://github.com/rust-lang/rust/pull/64010/
2464 [64028]: https://github.com/rust-lang/rust/pull/64028/
2465 [64334]: https://github.com/rust-lang/rust/pull/64334/
2466 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2467 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2468 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2469 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2470 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2471 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2473 Version 1.38.0 (2019-09-26)
2474 ==========================
2478 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2479 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2483 - [Added pipelined compilation support to `rustc`.][62766] This will
2484 improve compilation times in some cases. For further information please refer
2485 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2486 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2487 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2488 `x86_64-uwp-windows-msvc` targets.][60260]
2489 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2490 `armv7-unknown-linux-musleabi` targets.][63107]
2491 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2492 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2493 - [Upgraded to LLVM 9.][62592]
2495 \* Refer to Rust's [platform support page][platform-support-doc] for more
2496 information on Rust's tiered platform support.
2500 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2501 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2502 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2503 is available at `std::clone::Clone`). This also makes all built-in macros
2504 available in `std`/`core` root. e.g. `std::include_bytes!`.
2505 - [`str::Chars` now implements `Debug`.][63000]
2506 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2507 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2508 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2509 - [Added euclidean remainder and division operations (`div_euclid`,
2510 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2511 `overflowing`, and `wrapping` versions are available for all
2513 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2514 `PartialEq`.][61491]
2515 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2519 - [`<*const T>::cast`]
2520 - [`<*mut T>::cast`]
2521 - [`Duration::as_secs_f32`]
2522 - [`Duration::as_secs_f64`]
2523 - [`Duration::div_f32`]
2524 - [`Duration::div_f64`]
2525 - [`Duration::from_secs_f32`]
2526 - [`Duration::from_secs_f64`]
2527 - [`Duration::mul_f32`]
2528 - [`Duration::mul_f64`]
2529 - [`any::type_name`]
2533 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2534 - [You can now pass the `--features` option multiple times to enable
2535 multiple features.][cargo/7084]
2540 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2544 - [`rustc` will now warn about some incorrect uses of
2545 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2549 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2551 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2552 issues][62896] with certain crates such as libc.
2554 [60260]: https://github.com/rust-lang/rust/pull/60260/
2555 [61457]: https://github.com/rust-lang/rust/pull/61457/
2556 [61491]: https://github.com/rust-lang/rust/pull/61491/
2557 [61884]: https://github.com/rust-lang/rust/pull/61884/
2558 [61953]: https://github.com/rust-lang/rust/pull/61953/
2559 [62042]: https://github.com/rust-lang/rust/pull/62042/
2560 [62528]: https://github.com/rust-lang/rust/pull/62528/
2561 [62583]: https://github.com/rust-lang/rust/pull/62583/
2562 [62735]: https://github.com/rust-lang/rust/pull/62735/
2563 [62766]: https://github.com/rust-lang/rust/pull/62766/
2564 [62784]: https://github.com/rust-lang/rust/pull/62784/
2565 [62592]: https://github.com/rust-lang/rust/pull/62592/
2566 [62785]: https://github.com/rust-lang/rust/issues/62785/
2567 [62814]: https://github.com/rust-lang/rust/pull/62814/
2568 [62896]: https://github.com/rust-lang/rust/issues/62896/
2569 [63000]: https://github.com/rust-lang/rust/pull/63000/
2570 [63056]: https://github.com/rust-lang/rust/pull/63056/
2571 [63107]: https://github.com/rust-lang/rust/pull/63107/
2572 [63346]: https://github.com/rust-lang/rust/pull/63346/
2573 [63421]: https://github.com/rust-lang/rust/pull/63421/
2574 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2575 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2576 [63048]: https://github.com/rust-lang/rust/pull/63048
2577 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2578 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2579 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2580 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2581 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2582 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2583 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2584 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2585 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2586 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2587 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2588 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2589 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2591 Version 1.37.0 (2019-08-15)
2592 ==========================
2596 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2597 [`Box`][62228], or an [array][62235] and unused.
2598 - [You can now use the `cfg` and `cfg_attr` attributes on
2599 generic parameters.][61547]
2600 - [You can now use enum variants through type alias.][61682] e.g. You can
2601 write the following:
2603 type MyOption = Option<u8>;
2605 fn increment_or_zero(x: MyOption) -> u8 {
2607 MyOption::Some(y) => y + 1,
2608 MyOption::None => 0,
2612 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2613 `const _: u32 = 5;`.
2614 - [You can now use `#[repr(align(X)]` on enums.][61229]
2615 - [The `?` Kleene macro operator is now available in the
2616 2015 edition.][60932]
2620 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2621 and `-C profile-use` flags.][61268] For more information on how to use profile
2622 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2623 - [The `rust-lldb` wrapper script should now work again.][61827]
2627 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2631 - [`BufReader::buffer`]
2632 - [`BufWriter::buffer`]
2633 - [`Cell::from_mut`]
2634 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2635 - [`DoubleEndedIterator::nth_back`]
2637 - [`Wrapping::reverse_bits`]
2638 - [`i128::reverse_bits`]
2639 - [`i16::reverse_bits`]
2640 - [`i32::reverse_bits`]
2641 - [`i64::reverse_bits`]
2642 - [`i8::reverse_bits`]
2643 - [`isize::reverse_bits`]
2644 - [`slice::copy_within`]
2645 - [`u128::reverse_bits`]
2646 - [`u16::reverse_bits`]
2647 - [`u32::reverse_bits`]
2648 - [`u64::reverse_bits`]
2649 - [`u8::reverse_bits`]
2650 - [`usize::reverse_bits`]
2654 - [`Cargo.lock` files are now included by default when publishing executable crates
2655 with executables.][cargo/7026]
2656 - [You can now specify `default-run="foo"` in `[package]` to specify the
2657 default executable to use for `cargo run`.][cargo/7056]
2664 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2665 Please transition your code to using the `..=` syntax for inclusive
2667 - [Using a trait object without the `dyn` will now warn by default.][61203]
2668 Please transition your code to use `dyn Trait` for trait objects instead.
2670 [62228]: https://github.com/rust-lang/rust/pull/62228/
2671 [62235]: https://github.com/rust-lang/rust/pull/62235/
2672 [61802]: https://github.com/rust-lang/rust/pull/61802/
2673 [61827]: https://github.com/rust-lang/rust/pull/61827/
2674 [61547]: https://github.com/rust-lang/rust/pull/61547/
2675 [61682]: https://github.com/rust-lang/rust/pull/61682/
2676 [61268]: https://github.com/rust-lang/rust/pull/61268/
2677 [61342]: https://github.com/rust-lang/rust/pull/61342/
2678 [61347]: https://github.com/rust-lang/rust/pull/61347/
2679 [61100]: https://github.com/rust-lang/rust/pull/61100/
2680 [61203]: https://github.com/rust-lang/rust/pull/61203/
2681 [61229]: https://github.com/rust-lang/rust/pull/61229/
2682 [60932]: https://github.com/rust-lang/rust/pull/60932/
2683 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2684 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2685 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2686 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2687 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2688 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2689 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2690 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2691 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2692 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2693 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2694 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2695 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2696 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2697 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2698 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2699 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2700 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2701 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2702 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2703 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2704 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2705 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2706 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2709 Version 1.36.0 (2019-07-04)
2710 ==========================
2714 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2715 - [The order of traits in trait objects no longer affects the semantics of that
2716 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2717 `dyn fmt::Debug + Send`, where this was previously not the case.
2721 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2722 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2723 - [`mem::needs_drop` is now available as a const fn.][60364]
2724 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2725 - [`String` now implements `BorrowMut<str>`.][60404]
2726 - [`io::Cursor` now implements `Default`.][60234]
2727 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2728 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2729 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2730 environment has access to heap memory allocation.
2731 - [`String` now implements `From<&String>`.][59825]
2732 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2733 return a tuple of each argument when there is multiple arguments.
2734 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2739 - [`VecDeque::rotate_left`]
2740 - [`VecDeque::rotate_right`]
2741 - [`Iterator::copied`]
2743 - [`io::IoSliceMut`]
2744 - [`Read::read_vectored`]
2745 - [`Write::write_vectored`]
2746 - [`str::as_mut_ptr`]
2747 - [`mem::MaybeUninit`]
2748 - [`pointer::align_offset`]
2749 - [`future::Future`]
2751 - [`task::RawWaker`]
2752 - [`task::RawWakerVTable`]
2758 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2759 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2761 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2765 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2772 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2773 longer recommended, and will be deprecated in 1.39.0.
2775 [60318]: https://github.com/rust-lang/rust/pull/60318/
2776 [60364]: https://github.com/rust-lang/rust/pull/60364/
2777 [60370]: https://github.com/rust-lang/rust/pull/60370/
2778 [60404]: https://github.com/rust-lang/rust/pull/60404/
2779 [60234]: https://github.com/rust-lang/rust/pull/60234/
2780 [60244]: https://github.com/rust-lang/rust/pull/60244/
2781 [58623]: https://github.com/rust-lang/rust/pull/58623/
2782 [59648]: https://github.com/rust-lang/rust/pull/59648/
2783 [59675]: https://github.com/rust-lang/rust/pull/59675/
2784 [59825]: https://github.com/rust-lang/rust/pull/59825/
2785 [59826]: https://github.com/rust-lang/rust/pull/59826/
2786 [59445]: https://github.com/rust-lang/rust/pull/59445/
2787 [59114]: https://github.com/rust-lang/rust/pull/59114/
2788 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2789 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2790 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2791 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2792 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2793 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2794 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2795 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2796 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2797 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2798 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2799 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2800 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2801 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2802 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2803 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2804 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2805 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2806 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2807 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2810 Version 1.35.0 (2019-05-23)
2811 ==========================
2815 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2816 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2817 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2819 unsafe fn call_unsafe(func: unsafe fn()) {
2824 unsafe { call_unsafe(|| {}); }
2831 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2832 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2833 - [Added the `wasm32-unknown-wasi` target.][59464]
2838 - [`Thread` will now show its ID in `Debug` output.][59460]
2839 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2840 - [`alloc::System` now implements `Default`.][59451]
2841 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2843 - [`char::{ToLowercase, ToUppercase}` now
2844 implement `ExactSizeIterator`.][58778]
2845 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2846 - [Removed the `Read` trait bounds
2847 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2848 - [You can now call the `dbg!` macro without any parameters to print the file
2849 and line where it is called.][57847]
2850 - [In place ASCII case conversions are now up to 4× faster.][59283]
2851 e.g. `str::make_ascii_lowercase`
2852 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2859 - [`RefCell::replace_with`]
2860 - [`RefCell::map_split`]
2862 - [`Range::contains`]
2863 - [`RangeFrom::contains`]
2864 - [`RangeTo::contains`]
2865 - [`RangeInclusive::contains`]
2866 - [`RangeToInclusive::contains`]
2867 - [`Option::copied`]
2871 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2872 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2877 - [The Rust toolchain is now available natively for musl based distros.][58575]
2879 [59460]: https://github.com/rust-lang/rust/pull/59460/
2880 [59464]: https://github.com/rust-lang/rust/pull/59464/
2881 [59500]: https://github.com/rust-lang/rust/pull/59500/
2882 [59512]: https://github.com/rust-lang/rust/pull/59512/
2883 [59580]: https://github.com/rust-lang/rust/pull/59580/
2884 [59283]: https://github.com/rust-lang/rust/pull/59283/
2885 [59451]: https://github.com/rust-lang/rust/pull/59451/
2886 [59076]: https://github.com/rust-lang/rust/pull/59076/
2887 [58778]: https://github.com/rust-lang/rust/pull/58778/
2888 [58717]: https://github.com/rust-lang/rust/pull/58717/
2889 [58369]: https://github.com/rust-lang/rust/pull/58369/
2890 [58423]: https://github.com/rust-lang/rust/pull/58423/
2891 [58080]: https://github.com/rust-lang/rust/pull/58080/
2892 [57847]: https://github.com/rust-lang/rust/pull/57847/
2893 [58575]: https://github.com/rust-lang/rust/pull/58575
2894 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2895 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2896 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2897 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2898 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2899 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2900 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2901 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2902 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2903 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2904 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2905 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2907 Version 1.34.2 (2019-05-14)
2908 ===========================
2910 * [Destabilize the `Error::type_id` function due to a security
2911 vulnerability][60785] ([CVE-2019-12083])
2913 [60785]: https://github.com/rust-lang/rust/pull/60785
2914 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2916 Version 1.34.1 (2019-04-25)
2917 ===========================
2919 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2920 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2921 * [Fix Clippy panic when checking some macros][clippy/3805]
2923 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2924 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2925 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2927 Version 1.34.0 (2019-04-11)
2928 ==========================
2932 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2933 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2935 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2936 `#[attr{}]` procedural macros.][57367]
2937 - [You can now write `extern crate self as foo;`][57407] to import your
2938 crate's root into the extern prelude.
2943 - [You can now target `riscv64imac-unknown-none-elf` and
2944 `riscv64gc-unknown-none-elf`.][58406]
2945 - [You can now enable linker plugin LTO optimisations with
2946 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2947 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2949 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2954 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2955 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2956 the `Hash` trait to create an iterator.
2957 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2958 methods.][58421] Most notably you no longer require the `Ord` trait to create
2960 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2961 for all numeric types.][58044]
2962 - [Indexing a `str` is now generic over all types that
2963 implement `SliceIndex<str>`.][57604]
2964 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2965 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2966 produce a warning if their returning type is unused.
2967 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2968 `overflowing_pow` are now available for all numeric types.][57873] These are
2969 equivalent to methods such as `wrapping_add` for the `pow` operation.
2977 * [`Error::type_id`]
2978 * [`atomic::AtomicI16`]
2979 * [`atomic::AtomicI32`]
2980 * [`atomic::AtomicI64`]
2981 * [`atomic::AtomicI8`]
2982 * [`atomic::AtomicU16`]
2983 * [`atomic::AtomicU32`]
2984 * [`atomic::AtomicU64`]
2985 * [`atomic::AtomicU8`]
2986 * [`convert::Infallible`]
2987 * [`convert::TryFrom`]
2988 * [`convert::TryInto`]
2990 * [`iter::successors`]
2991 * [`num::NonZeroI128`]
2992 * [`num::NonZeroI16`]
2993 * [`num::NonZeroI32`]
2994 * [`num::NonZeroI64`]
2995 * [`num::NonZeroI8`]
2996 * [`num::NonZeroIsize`]
2997 * [`slice::sort_by_cached_key`]
2998 * [`str::escape_debug`]
2999 * [`str::escape_default`]
3000 * [`str::escape_unicode`]
3001 * [`str::split_ascii_whitespace`]
3004 * [`Instant::checked_add`]
3005 * [`Instant::checked_sub`]
3006 * [`SystemTime::checked_add`]
3007 * [`SystemTime::checked_sub`]
3011 - [You can now use alternative registries to crates.io.][cargo/6654]
3015 - [You can now use the `?` operator in your documentation tests without manually
3016 adding `fn main() -> Result<(), _> {}`.][56470]
3020 - [`Command::before_exec` is being replaced by the unsafe method
3021 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3022 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3023 can now use `const` functions in `static` variables.
3025 [58370]: https://github.com/rust-lang/rust/pull/58370/
3026 [58406]: https://github.com/rust-lang/rust/pull/58406/
3027 [58421]: https://github.com/rust-lang/rust/pull/58421/
3028 [58166]: https://github.com/rust-lang/rust/pull/58166/
3029 [58044]: https://github.com/rust-lang/rust/pull/58044/
3030 [58057]: https://github.com/rust-lang/rust/pull/58057/
3031 [58059]: https://github.com/rust-lang/rust/pull/58059/
3032 [57809]: https://github.com/rust-lang/rust/pull/57809/
3033 [57873]: https://github.com/rust-lang/rust/pull/57873/
3034 [57604]: https://github.com/rust-lang/rust/pull/57604/
3035 [57367]: https://github.com/rust-lang/rust/pull/57367/
3036 [57407]: https://github.com/rust-lang/rust/pull/57407/
3037 [57425]: https://github.com/rust-lang/rust/pull/57425/
3038 [57106]: https://github.com/rust-lang/rust/pull/57106/
3039 [56470]: https://github.com/rust-lang/rust/pull/56470/
3040 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3041 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3042 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3043 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3044 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3045 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3046 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3047 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3048 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3049 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3050 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3051 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3052 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3053 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3054 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3055 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3056 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3057 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3058 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3059 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3060 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3061 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3062 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3063 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3064 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3065 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3066 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3067 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3068 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3069 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3070 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3073 Version 1.33.0 (2019-02-28)
3074 ==========================
3078 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3079 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3080 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3081 E.g. You can have match statement on a `u8` that covers `0..=255` and
3082 you would no longer be required to have a `_ => unreachable!()` case.
3083 - [You can now have multiple patterns in `if let` and `while let`
3084 expressions.][57532] You can do this with the same syntax as a `match`
3094 let state = Creature::Crab("Ferris");
3096 if let Creature::Crab(name) | Creature::Person(name) = state {
3097 println!("This creature's name is: {}", name);
3101 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3102 this feature will by default produce a warning as this behaviour can be
3103 unintuitive. E.g. `if let _ = 5 {}`
3104 - [You can now use `let` bindings, assignments, expression statements,
3105 and irrefutable pattern destructuring in const functions.][57175]
3106 - [You can now call unsafe const functions.][57067] E.g.
3108 const unsafe fn foo() -> i32 { 5 }
3109 const fn bar() -> i32 {
3113 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3114 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3115 - [You can now specify a specific alignment with the `#[repr(packed)]`
3116 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3117 with an alignment of 2 bytes and a size of 6 bytes.
3118 - [You can now import an item from a module as an `_`.][56303] This allows you to
3119 import a trait's impls, and not have the name in the namespace. E.g.
3121 use std::io::Read as _;
3123 // Allowed as there is only one `Read` in the module.
3126 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3130 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3131 command line argument.][56351]
3132 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3133 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3134 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3135 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3136 information on Rust's platform support.
3137 - [Added support for the `thumbv7neon-linux-androideabi` and
3138 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3139 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3143 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3144 functions for all numeric types.][57566]
3145 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3146 are now `const` functions for all numeric types.][57105]
3147 - [The methods `is_positive` and `is_negative` are now `const` functions for
3148 all signed numeric types.][57105]
3149 - [The `get` method for all `NonZero` types is now `const`.][57167]
3150 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3151 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3152 numeric types.][57234]
3153 - [`Ipv4Addr::new` is now a `const` function][57234]
3157 - [`unix::FileExt::read_exact_at`]
3158 - [`unix::FileExt::write_all_at`]
3159 - [`Option::transpose`]
3160 - [`Result::transpose`]
3161 - [`convert::identity`]
3164 - [`marker::PhantomPinned`]
3165 - [`Vec::resize_with`]
3166 - [`VecDeque::resize_with`]
3167 - [`Duration::as_millis`]
3168 - [`Duration::as_micros`]
3169 - [`Duration::as_nanos`]
3174 - [You can now publish crates that require a feature flag to compile with
3175 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3176 - [Cargo should now rebuild a crate if a file was modified during the initial
3181 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3182 are now deprecated in the standard library, and their usage will now produce a warning.
3183 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3185 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3187 - [Libtest no longer creates a new thread for each test when
3188 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3190 [55982]: https://github.com/rust-lang/rust/pull/55982/
3191 [56243]: https://github.com/rust-lang/rust/pull/56243
3192 [56303]: https://github.com/rust-lang/rust/pull/56303/
3193 [56351]: https://github.com/rust-lang/rust/pull/56351/
3194 [56362]: https://github.com/rust-lang/rust/pull/56362
3195 [56642]: https://github.com/rust-lang/rust/pull/56642/
3196 [56769]: https://github.com/rust-lang/rust/pull/56769/
3197 [56805]: https://github.com/rust-lang/rust/pull/56805
3198 [56947]: https://github.com/rust-lang/rust/pull/56947/
3199 [57049]: https://github.com/rust-lang/rust/pull/57049/
3200 [57067]: https://github.com/rust-lang/rust/pull/57067/
3201 [57105]: https://github.com/rust-lang/rust/pull/57105
3202 [57130]: https://github.com/rust-lang/rust/pull/57130/
3203 [57167]: https://github.com/rust-lang/rust/pull/57167/
3204 [57175]: https://github.com/rust-lang/rust/pull/57175/
3205 [57234]: https://github.com/rust-lang/rust/pull/57234/
3206 [57332]: https://github.com/rust-lang/rust/pull/57332/
3207 [57465]: https://github.com/rust-lang/rust/pull/57465/
3208 [57532]: https://github.com/rust-lang/rust/pull/57532/
3209 [57535]: https://github.com/rust-lang/rust/pull/57535/
3210 [57566]: https://github.com/rust-lang/rust/pull/57566/
3211 [57615]: https://github.com/rust-lang/rust/pull/57615/
3212 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3213 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3214 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3215 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3216 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3217 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3218 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3219 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3220 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3221 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3222 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3223 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3224 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3225 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3226 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3227 [platform-support]: https://forge.rust-lang.org/platform-support.html
3229 Version 1.32.0 (2019-01-17)
3230 ==========================
3235 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3236 operator allows you to specify zero or one repetitions similar to the `*` and
3238 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3239 now always resolve to the item (`enum`, `struct`, etc.) available in the
3240 module if present, before resolving to a external crate or an item the prelude.][56759]
3243 enum Color { Red, Green, Blue }
3249 - [You can now match against `PhantomData<T>` types.][55837]
3250 - [You can now match against literals in macros with the `literal`
3251 specifier.][56072] This will match against a literal of any type.
3252 E.g. `1`, `'A'`, `"Hello World"`
3253 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3255 struct Point(i32, i32);
3258 pub fn new(x: i32, y: i32) -> Self {
3262 pub fn is_origin(&self) -> bool {
3270 - [Self can also now be used in type definitions.][56366] E.g.
3274 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3277 Cons(T, Box<Self>) // likewise here
3280 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3281 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3285 - [The default allocator has changed from jemalloc to the default allocator on
3286 your system.][55238] The compiler itself on Linux & macOS will still use
3287 jemalloc, but programs compiled with it will use the system allocator.
3288 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3292 - [`PathBuf` now implements `FromStr`.][55148]
3293 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3294 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3295 easily debug expressions in your rust program. E.g.
3298 let b = dbg!(a * 2) + 1;
3299 // ^-- prints: [src/main.rs:4] a * 2 = 4
3303 The following APIs are now `const` functions and can be used in a
3307 - [`UnsafeCell::get`]
3308 - [`char::is_ascii`]
3310 - [`ManuallyDrop::new`]
3311 - [`ManuallyDrop::into_inner`]
3312 - [`RangeInclusive::start`]
3313 - [`RangeInclusive::end`]
3314 - [`NonNull::as_ptr`]
3317 - [`Duration::as_secs`]
3318 - [`Duration::subsec_millis`]
3319 - [`Duration::subsec_micros`]
3320 - [`Duration::subsec_nanos`]
3322 - [`Ipv4Addr::is_unspecified`]
3324 - [`Ipv6Addr::octets`]
3328 - [`i8::to_be_bytes`]
3329 - [`i8::to_le_bytes`]
3330 - [`i8::to_ne_bytes`]
3331 - [`i8::from_be_bytes`]
3332 - [`i8::from_le_bytes`]
3333 - [`i8::from_ne_bytes`]
3334 - [`i16::to_be_bytes`]
3335 - [`i16::to_le_bytes`]
3336 - [`i16::to_ne_bytes`]
3337 - [`i16::from_be_bytes`]
3338 - [`i16::from_le_bytes`]
3339 - [`i16::from_ne_bytes`]
3340 - [`i32::to_be_bytes`]
3341 - [`i32::to_le_bytes`]
3342 - [`i32::to_ne_bytes`]
3343 - [`i32::from_be_bytes`]
3344 - [`i32::from_le_bytes`]
3345 - [`i32::from_ne_bytes`]
3346 - [`i64::to_be_bytes`]
3347 - [`i64::to_le_bytes`]
3348 - [`i64::to_ne_bytes`]
3349 - [`i64::from_be_bytes`]
3350 - [`i64::from_le_bytes`]
3351 - [`i64::from_ne_bytes`]
3352 - [`i128::to_be_bytes`]
3353 - [`i128::to_le_bytes`]
3354 - [`i128::to_ne_bytes`]
3355 - [`i128::from_be_bytes`]
3356 - [`i128::from_le_bytes`]
3357 - [`i128::from_ne_bytes`]
3358 - [`isize::to_be_bytes`]
3359 - [`isize::to_le_bytes`]
3360 - [`isize::to_ne_bytes`]
3361 - [`isize::from_be_bytes`]
3362 - [`isize::from_le_bytes`]
3363 - [`isize::from_ne_bytes`]
3364 - [`u8::to_be_bytes`]
3365 - [`u8::to_le_bytes`]
3366 - [`u8::to_ne_bytes`]
3367 - [`u8::from_be_bytes`]
3368 - [`u8::from_le_bytes`]
3369 - [`u8::from_ne_bytes`]
3370 - [`u16::to_be_bytes`]
3371 - [`u16::to_le_bytes`]
3372 - [`u16::to_ne_bytes`]
3373 - [`u16::from_be_bytes`]
3374 - [`u16::from_le_bytes`]
3375 - [`u16::from_ne_bytes`]
3376 - [`u32::to_be_bytes`]
3377 - [`u32::to_le_bytes`]
3378 - [`u32::to_ne_bytes`]
3379 - [`u32::from_be_bytes`]
3380 - [`u32::from_le_bytes`]
3381 - [`u32::from_ne_bytes`]
3382 - [`u64::to_be_bytes`]
3383 - [`u64::to_le_bytes`]
3384 - [`u64::to_ne_bytes`]
3385 - [`u64::from_be_bytes`]
3386 - [`u64::from_le_bytes`]
3387 - [`u64::from_ne_bytes`]
3388 - [`u128::to_be_bytes`]
3389 - [`u128::to_le_bytes`]
3390 - [`u128::to_ne_bytes`]
3391 - [`u128::from_be_bytes`]
3392 - [`u128::from_le_bytes`]
3393 - [`u128::from_ne_bytes`]
3394 - [`usize::to_be_bytes`]
3395 - [`usize::to_le_bytes`]
3396 - [`usize::to_ne_bytes`]
3397 - [`usize::from_be_bytes`]
3398 - [`usize::from_le_bytes`]
3399 - [`usize::from_ne_bytes`]
3403 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3404 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3408 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3412 - [The argument types for AVX's
3413 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3414 been changed from `*const` to `*mut` as the previous implementation
3418 [55148]: https://github.com/rust-lang/rust/pull/55148/
3419 [55238]: https://github.com/rust-lang/rust/pull/55238/
3420 [55280]: https://github.com/rust-lang/rust/pull/55280/
3421 [55610]: https://github.com/rust-lang/rust/pull/55610/
3422 [55663]: https://github.com/rust-lang/rust/pull/55663/
3423 [55702]: https://github.com/rust-lang/rust/pull/55702/
3424 [55837]: https://github.com/rust-lang/rust/pull/55837/
3425 [55843]: https://github.com/rust-lang/rust/pull/55843/
3426 [56072]: https://github.com/rust-lang/rust/pull/56072/
3427 [56245]: https://github.com/rust-lang/rust/pull/56245/
3428 [56365]: https://github.com/rust-lang/rust/pull/56365/
3429 [56366]: https://github.com/rust-lang/rust/pull/56366/
3430 [56395]: https://github.com/rust-lang/rust/pull/56395/
3431 [56759]: https://github.com/rust-lang/rust/pull/56759/
3432 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3433 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3434 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3435 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3436 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3437 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3438 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3439 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3440 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3441 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3442 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3443 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3444 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3445 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3446 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3447 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3448 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3449 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3450 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3451 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3452 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3453 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3454 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3455 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3456 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3457 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3458 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3459 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3460 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3461 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3462 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3463 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3464 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3465 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3466 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3467 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3468 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3469 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3470 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3471 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3472 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3473 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3474 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3475 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3476 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3477 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3478 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3479 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3480 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3481 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3482 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3483 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3484 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3485 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3486 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3487 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3488 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3489 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3490 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3491 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3492 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3493 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3494 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3495 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3496 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3497 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3498 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3499 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3500 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3501 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3502 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3503 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3504 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3505 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3506 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3507 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3508 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3509 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3510 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3511 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3512 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3513 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3514 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3515 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3516 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3517 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3518 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3519 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3520 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3521 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3522 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3523 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3524 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3527 Version 1.31.1 (2018-12-20)
3528 ===========================
3530 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3531 - [Fix broken go-to-definition in RLS][rls/1171]
3532 - [Fix infinite loop on hover in RLS][rls/1170]
3534 [56562]: https://github.com/rust-lang/rust/pull/56562
3535 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3536 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3538 Version 1.31.0 (2018-12-06)
3539 ==========================
3543 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3544 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3545 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3546 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3548 - [You can now define and use `const` functions.][54835] These are currently
3549 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3550 [language reference][const-reference] for what exactly is available.
3551 - [You can now use tool lints, which allow you to scope lints from external
3552 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3553 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3554 a crate, not just in exported functions.][54451]
3555 - [You can now use parentheses in pattern matches.][54497]
3559 - [Updated musl to 1.1.20][54430]
3563 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3564 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3565 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3566 into `Option<&mut T>` using the `From` trait.][53218]
3567 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3572 - [`slice::align_to`]
3573 - [`slice::align_to_mut`]
3574 - [`slice::chunks_exact`]
3575 - [`slice::chunks_exact_mut`]
3576 - [`slice::rchunks`]
3577 - [`slice::rchunks_mut`]
3578 - [`slice::rchunks_exact`]
3579 - [`slice::rchunks_exact_mut`]
3580 - [`Option::replace`]
3584 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3585 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3586 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3588 [52813]: https://github.com/rust-lang/rust/pull/52813/
3589 [53218]: https://github.com/rust-lang/rust/pull/53218/
3590 [53555]: https://github.com/rust-lang/rust/issues/53555/
3591 [54057]: https://github.com/rust-lang/rust/pull/54057/
3592 [54240]: https://github.com/rust-lang/rust/pull/54240/
3593 [54430]: https://github.com/rust-lang/rust/pull/54430/
3594 [54451]: https://github.com/rust-lang/rust/pull/54451/
3595 [54497]: https://github.com/rust-lang/rust/pull/54497/
3596 [54778]: https://github.com/rust-lang/rust/pull/54778/
3597 [54835]: https://github.com/rust-lang/rust/pull/54835/
3598 [54870]: https://github.com/rust-lang/rust/pull/54870/
3599 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3600 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3601 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3602 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3603 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3604 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3605 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3606 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3607 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3608 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3609 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3610 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3611 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3612 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3614 Version 1.30.1 (2018-11-08)
3615 ===========================
3617 - [Fixed overflow ICE in rustdoc][54199]
3618 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3620 [54199]: https://github.com/rust-lang/rust/pull/54199
3621 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3623 Version 1.30.0 (2018-10-25)
3624 ==========================
3628 - [Procedural macros are now available.][52081] These kinds of macros allow for
3629 more powerful code generation. There is a [new chapter available][proc-macros]
3630 in the Rust Programming Language book that goes further in depth.
3631 - [You can now use keywords as identifiers using the raw identifiers
3632 syntax (`r#`),][53236] e.g. `let r#for = true;`
3633 - [Using anonymous parameters in traits is now deprecated with a warning and
3634 will be a hard error in the 2018 edition.][53272]
3635 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3636 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3637 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3638 Previously, using a external crate in a module without a use statement
3639 required `let json = ::serde_json::from_str(foo);` but can now be written
3640 as `let json = serde_json::from_str(foo);`.
3641 - [You can now apply the `#[used]` attribute to static items to prevent the
3642 compiler from optimising them away, even if they appear to be unused,][51363]
3643 e.g. `#[used] static FOO: u32 = 1;`
3644 - [You can now import and reexport macros from other crates with the `use`
3645 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3646 the root module of the crate. If your macro relies on calling other local
3647 macros, it is recommended to export with the
3648 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3650 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3651 using the `vis` specifier.][53370]
3652 - [Non-macro attributes now allow all forms of literals, not just
3653 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3654 write `#[attr(true)]`.
3655 - [You can now specify a function to handle a panic in the Rust runtime with the
3656 `#[panic_handler]` attribute.][51366]
3660 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3661 - [Added the `aarch64-unknown-netbsd` target][53165]
3662 - [Upgraded to LLVM 8.][53611]
3666 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3670 - [`Ipv4Addr::BROADCAST`]
3671 - [`Ipv4Addr::LOCALHOST`]
3672 - [`Ipv4Addr::UNSPECIFIED`]
3673 - [`Ipv6Addr::LOCALHOST`]
3674 - [`Ipv6Addr::UNSPECIFIED`]
3675 - [`Iterator::find_map`]
3677 The following methods are replacement methods for `trim_left`, `trim_right`,
3678 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3680 - [`str::trim_end_matches`]
3682 - [`str::trim_start_matches`]
3683 - [`str::trim_start`]
3687 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3688 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3689 equivalent to calling `rustdoc --error-format=json`.
3690 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3694 - [`rustdoc` allows you to specify what edition to treat your code as with the
3695 `--edition` option.][54057]
3696 - [`rustdoc` now has the `--color` (specify whether to output color) and
3697 `--error-format` (specify error format, e.g. `json`) options.][53003]
3698 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3699 debug symbols.][53774]
3700 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3701 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3703 [50911]: https://github.com/rust-lang/rust/pull/50911/
3704 [51363]: https://github.com/rust-lang/rust/pull/51363/
3705 [51366]: https://github.com/rust-lang/rust/pull/51366/
3706 [52081]: https://github.com/rust-lang/rust/pull/52081/
3707 [53003]: https://github.com/rust-lang/rust/pull/53003/
3708 [53033]: https://github.com/rust-lang/rust/pull/53033/
3709 [53044]: https://github.com/rust-lang/rust/pull/53044/
3710 [53165]: https://github.com/rust-lang/rust/pull/53165/
3711 [53611]: https://github.com/rust-lang/rust/pull/53611/
3712 [53213]: https://github.com/rust-lang/rust/pull/53213/
3713 [53236]: https://github.com/rust-lang/rust/pull/53236/
3714 [53272]: https://github.com/rust-lang/rust/pull/53272/
3715 [53370]: https://github.com/rust-lang/rust/pull/53370/
3716 [53459]: https://github.com/rust-lang/rust/pull/53459/
3717 [53774]: https://github.com/rust-lang/rust/pull/53774/
3718 [53822]: https://github.com/rust-lang/rust/pull/53822/
3719 [54057]: https://github.com/rust-lang/rust/pull/54057/
3720 [54146]: https://github.com/rust-lang/rust/pull/54146/
3721 [54404]: https://github.com/rust-lang/rust/pull/54404/
3722 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3723 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3724 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3725 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3727 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3728 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3729 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3730 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3731 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3732 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3733 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3734 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3735 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3736 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3739 Version 1.29.2 (2018-10-11)
3740 ===========================
3742 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3743 - The `rls-preview` component on the windows-gnu targets has been restored.
3745 [54639]: https://github.com/rust-lang/rust/pull/54639
3748 Version 1.29.1 (2018-09-25)
3749 ===========================
3754 - The standard library's `str::repeat` function contained an out of bounds write
3755 caused by an integer overflow. This has been fixed by deterministically
3756 panicking when an overflow happens.
3758 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3762 Version 1.29.0 (2018-09-13)
3763 ==========================
3767 - [Bumped minimum LLVM version to 5.0.][51899]
3768 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3769 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3770 - [Upgraded to LLVM 7.][51966]
3774 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3775 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3776 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3777 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3779 - [`Cell<T>` now allows `T` to be unsized.][50494]
3780 - [`SocketAddr` is now stable on Redox.][52656]
3785 - [`Iterator::flatten`]
3790 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3791 `--locked` to disable this behavior.
3792 - [`cargo-install` will now allow you to cross compile an install
3793 using `--target`.][cargo/5614]
3794 - [Added the `cargo-fix` subcommand to automatically move project code from
3795 2015 edition to 2018.][cargo/5723]
3796 - [`cargo doc` can now optionally document private types using the
3797 `--document-private-items` flag.][cargo/5543]
3801 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3802 the specified level to that level.][52354] For example `--cap-lints warn`
3803 will demote `deny` and `forbid` lints to `warn`.
3804 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3805 fails and `101` if there is a panic.][52197]
3806 - [A preview of clippy has been made available through rustup.][51122]
3807 You can install the preview with `rustup component add clippy-preview`.
3811 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3812 Use `str::get_unchecked(begin..end)` instead.
3813 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3814 Consider using the `home_dir` function from
3815 https://crates.io/crates/dirs instead.
3816 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3817 - [`cfg` attributes and `--cfg` command line flags are now more
3818 strictly validated.][53893]
3820 [53893]: https://github.com/rust-lang/rust/pull/53893/
3821 [52861]: https://github.com/rust-lang/rust/pull/52861/
3822 [51966]: https://github.com/rust-lang/rust/pull/51966/
3823 [52656]: https://github.com/rust-lang/rust/pull/52656/
3824 [52239]: https://github.com/rust-lang/rust/pull/52239/
3825 [52330]: https://github.com/rust-lang/rust/pull/52330/
3826 [52354]: https://github.com/rust-lang/rust/pull/52354/
3827 [52402]: https://github.com/rust-lang/rust/pull/52402/
3828 [52103]: https://github.com/rust-lang/rust/pull/52103/
3829 [52197]: https://github.com/rust-lang/rust/pull/52197/
3830 [51807]: https://github.com/rust-lang/rust/pull/51807/
3831 [51899]: https://github.com/rust-lang/rust/pull/51899/
3832 [51912]: https://github.com/rust-lang/rust/pull/51912/
3833 [51511]: https://github.com/rust-lang/rust/pull/51511/
3834 [51619]: https://github.com/rust-lang/rust/pull/51619/
3835 [51656]: https://github.com/rust-lang/rust/pull/51656/
3836 [51178]: https://github.com/rust-lang/rust/pull/51178/
3837 [51122]: https://github.com/rust-lang/rust/pull/51122
3838 [50494]: https://github.com/rust-lang/rust/pull/50494/
3839 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3840 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3841 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3842 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3843 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3844 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3845 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3848 Version 1.28.0 (2018-08-02)
3849 ===========================
3853 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3854 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3855 the inner type across Foreign Function Interface (FFI) boundaries.
3856 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3857 and can now be used as identifiers.][51196]
3858 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3859 stable.][51241] This will allow users to specify a global allocator for
3861 - [Unit test functions marked with the `#[test]` attribute can now return
3862 `Result<(), E: Debug>` in addition to `()`.][51298]
3863 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3864 allows macros to easily target lifetimes.
3868 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3869 prioritise making smaller binary sizes. `z` is the same as `s` with the
3870 exception that it does not vectorise loops, which typically results in an even
3872 - [The short error format is now stable.][49546] Specified with
3873 `--error-format=short` this option will provide a more compressed output of
3874 rust error messages.
3875 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3876 - [Reduced the number of allocations in the macro parser.][50855] This can
3877 improve compile times of macro heavy crates on average by 5%.
3881 - [Implemented `Default` for `&mut str`.][51306]
3882 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3883 - [Implemented `Extend` for `()`.][50234]
3884 - [The `Debug` implementation of `time::Duration` should now be more easily
3885 human readable.][50364] Previously a `Duration` of one second would printed as
3886 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3887 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3888 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3889 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3890 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3891 for `PathBuf`.][50170]
3892 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3893 and `Wrapping<i128>`.][50465]
3894 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3895 possible.][51050] This can provide up to a 40% speed increase.
3896 - [Improved error messages when using `format!`.][50610]
3900 - [`Iterator::step_by`]
3901 - [`Path::ancestors`]
3902 - [`SystemTime::UNIX_EPOCH`]
3903 - [`alloc::GlobalAlloc`]
3905 - [`alloc::LayoutErr`]
3908 - [`alloc::alloc_zeroed`]
3909 - [`alloc::dealloc`]
3910 - [`alloc::realloc`]
3911 - [`alloc::handle_alloc_error`]
3912 - [`btree_map::Entry::or_default`]
3913 - [`fmt::Alignment`]
3914 - [`hash_map::Entry::or_default`]
3915 - [`iter::repeat_with`]
3916 - [`num::NonZeroUsize`]
3917 - [`num::NonZeroU128`]
3918 - [`num::NonZeroU16`]
3919 - [`num::NonZeroU32`]
3920 - [`num::NonZeroU64`]
3921 - [`num::NonZeroU8`]
3922 - [`ops::RangeBounds`]
3923 - [`slice::SliceIndex`]
3924 - [`slice::from_mut`]
3925 - [`slice::from_ref`]
3926 - [`{Any + Send + Sync}::downcast_mut`]
3927 - [`{Any + Send + Sync}::downcast_ref`]
3928 - [`{Any + Send + Sync}::is`]
3932 - [Cargo will now no longer allow you to publish crates with build scripts that
3933 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3934 considered to be immutable.
3938 - [The `suggestion_applicability` field in `rustc`'s json output is now
3939 stable.][50486] This will allow dev tools to check whether a code suggestion
3940 would apply to them.
3944 - [Rust will consider trait objects with duplicated constraints to be the same
3945 type as without the duplicated constraint.][51276] For example the below code will
3946 now fail to compile.
3951 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3954 impl Trait + Send + Send {
3955 fn test(&self) { println!("two"); }
3959 [49546]: https://github.com/rust-lang/rust/pull/49546/
3960 [50143]: https://github.com/rust-lang/rust/pull/50143/
3961 [50170]: https://github.com/rust-lang/rust/pull/50170/
3962 [50234]: https://github.com/rust-lang/rust/pull/50234/
3963 [50265]: https://github.com/rust-lang/rust/pull/50265/
3964 [50364]: https://github.com/rust-lang/rust/pull/50364/
3965 [50385]: https://github.com/rust-lang/rust/pull/50385/
3966 [50465]: https://github.com/rust-lang/rust/pull/50465/
3967 [50486]: https://github.com/rust-lang/rust/pull/50486/
3968 [50554]: https://github.com/rust-lang/rust/pull/50554/
3969 [50610]: https://github.com/rust-lang/rust/pull/50610/
3970 [50855]: https://github.com/rust-lang/rust/pull/50855/
3971 [51050]: https://github.com/rust-lang/rust/pull/51050/
3972 [51196]: https://github.com/rust-lang/rust/pull/51196/
3973 [51200]: https://github.com/rust-lang/rust/pull/51200/
3974 [51241]: https://github.com/rust-lang/rust/pull/51241/
3975 [51276]: https://github.com/rust-lang/rust/pull/51276/
3976 [51298]: https://github.com/rust-lang/rust/pull/51298/
3977 [51306]: https://github.com/rust-lang/rust/pull/51306/
3978 [51562]: https://github.com/rust-lang/rust/pull/51562/
3979 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3980 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3981 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3982 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3983 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3984 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3985 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3986 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3987 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3988 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3989 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3990 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3991 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3992 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3993 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3994 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3995 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3996 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3997 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3998 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3999 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4000 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4001 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4002 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4003 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4004 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4005 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4006 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4007 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4008 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4010 Version 1.27.2 (2018-07-20)
4011 ===========================
4016 - The borrow checker was fixed to avoid potential unsoundness when using
4017 match ergonomics: [#52213][52213].
4019 [52213]: https://github.com/rust-lang/rust/issues/52213
4021 Version 1.27.1 (2018-07-10)
4022 ===========================
4027 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4028 when running, which enabled executing code as some other user on a
4029 given machine. This release fixes that vulnerability; you can read
4030 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4032 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4037 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4038 match ergonomics: [#51415][51415], [#49534][49534].
4040 [51415]: https://github.com/rust-lang/rust/issues/51415
4041 [49534]: https://github.com/rust-lang/rust/issues/49534
4042 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4043 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4045 Version 1.27.0 (2018-06-21)
4046 ==========================
4050 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4051 be used as an identifier.
4052 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4053 bare `Trait` syntax, and should make it clearer when being used in tandem with
4054 `impl Trait` because it is equivalent to the following syntax:
4055 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4056 `Box<Trait> == Box<dyn Trait>`.
4057 - [Attributes on generic parameters such as types and lifetimes are
4058 now stable.][48851] e.g.
4059 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4060 - [The `#[must_use]` attribute can now also be used on functions as well as
4061 types.][48925] It provides a lint that by default warns users when the
4062 value returned by a function has not been used.
4066 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4070 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4071 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4072 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4073 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4074 the `cfg` attribute.
4075 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4076 std are now available in core.][49896]
4077 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4079 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4080 that the operation isn't done in place.
4081 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4082 the `#[must_use]` attribute][49533] to warn about unused potentially
4083 expensive allocations.
4087 - [`DoubleEndedIterator::rfind`]
4088 - [`DoubleEndedIterator::rfold`]
4089 - [`DoubleEndedIterator::try_rfold`]
4090 - [`Duration::from_micros`]
4091 - [`Duration::from_nanos`]
4092 - [`Duration::subsec_micros`]
4093 - [`Duration::subsec_millis`]
4094 - [`HashMap::remove_entry`]
4095 - [`Iterator::try_fold`]
4096 - [`Iterator::try_for_each`]
4098 - [`Option::filter`]
4099 - [`String::replace_range`]
4100 - [`Take::set_limit`]
4101 - [`hint::unreachable_unchecked`]
4102 - [`os::unix::process::parent_id`]
4103 - [`ptr::swap_nonoverlapping`]
4104 - [`slice::rsplit_mut`]
4106 - [`slice::swap_with_slice`]
4110 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4111 `readme`, and `repository` fields.][cargo/5386]
4112 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4113 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4114 a different directory than `target` for placing compilation artifacts.
4115 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4116 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4117 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4118 where cargo would infer a binary, Cargo will produce a warning. You can
4119 disable this feature ahead of time by setting any of the following to false:
4120 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4121 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4122 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4126 - [Added “The Rustc book” into the official documentation.][49707]
4127 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4128 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4132 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4133 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4134 compile, `"".is_empty()` will still compile.
4135 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4136 will only print the inner type.][48553] E.g.
4137 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4138 not `AtomicBool(true)`.
4139 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4140 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4141 alignment should cover all use cases.
4142 - The `.description()` method on the `std::error::Error` trait
4143 [has been soft-deprecated][50163]. It is no longer required to implement it.
4145 [48553]: https://github.com/rust-lang/rust/pull/48553/
4146 [48851]: https://github.com/rust-lang/rust/pull/48851/
4147 [48925]: https://github.com/rust-lang/rust/pull/48925/
4148 [49533]: https://github.com/rust-lang/rust/pull/49533/
4149 [49623]: https://github.com/rust-lang/rust/pull/49623/
4150 [49630]: https://github.com/rust-lang/rust/pull/49630/
4151 [49664]: https://github.com/rust-lang/rust/pull/49664/
4152 [49699]: https://github.com/rust-lang/rust/pull/49699/
4153 [49707]: https://github.com/rust-lang/rust/pull/49707/
4154 [49719]: https://github.com/rust-lang/rust/pull/49719/
4155 [49896]: https://github.com/rust-lang/rust/pull/49896/
4156 [49968]: https://github.com/rust-lang/rust/pull/49968/
4157 [50163]: https://github.com/rust-lang/rust/pull/50163
4158 [50177]: https://github.com/rust-lang/rust/pull/50177/
4159 [50378]: https://github.com/rust-lang/rust/pull/50378/
4160 [50398]: https://github.com/rust-lang/rust/pull/50398/
4161 [50423]: https://github.com/rust-lang/rust/pull/50423/
4162 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4163 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4164 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4165 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4166 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4167 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4168 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4169 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4170 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4171 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4172 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4173 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4174 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4175 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4176 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4177 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4178 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4179 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4180 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4181 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4182 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4183 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4184 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4185 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4186 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4187 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4188 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4189 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4190 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4191 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4194 Version 1.26.2 (2018-06-05)
4195 ==========================
4200 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4202 [51117]: https://github.com/rust-lang/rust/issues/51117
4205 Version 1.26.1 (2018-05-29)
4206 ==========================
4211 - [RLS now works on Windows.][50646]
4212 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4218 - [`fn main() -> impl Trait` no longer works for non-Termination
4220 This reverts an accidental stabilization.
4221 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4222 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4224 [50646]: https://github.com/rust-lang/rust/issues/50646
4225 [50656]: https://github.com/rust-lang/rust/pull/50656
4226 [50812]: https://github.com/rust-lang/rust/pull/50812
4227 [50950]: https://github.com/rust-lang/rust/issues/50950
4228 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4230 Version 1.26.0 (2018-05-10)
4231 ==========================
4235 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4236 implement either or both traits.][49299]
4237 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4238 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4239 lifetime can be elided.][49458]
4240 - [`impl Trait` is now stable allowing you to have abstract types in returns
4241 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4242 `fn open(path: impl AsRef<Path>)`.
4243 - [Pattern matching will now automatically apply dereferences.][49394]
4244 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4245 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4246 - [A lot of operations are now available in a const context.][46882] E.g. You
4247 can now index into constant arrays, reference and dereference into constants,
4248 and use tuple struct constructors.
4249 - [Fixed entry slice patterns are now stable.][48516] E.g.
4251 let points = [1, 2, 3, 4];
4253 [1, 2, 3, 4] => println!("All points were sequential."),
4254 _ => println!("Not all points were sequential."),
4261 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4262 - [Fixed exponential projection complexity on nested types.][48296]
4263 This can provide up to a ~12% reduction in compile times for certain crates.
4264 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4265 to remap path prefixes outputted by the compiler.
4266 - [Added `powerpc-unknown-netbsd` target.][48281]
4270 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4271 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4272 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4273 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4274 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4275 - [`ascii::escape_default` is now available in libcore.][48735]
4276 - [Trailing commas are now supported in std and core macros.][48056]
4277 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4278 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4283 - [`*const T::copy_to_nonoverlapping`]
4284 - [`*const T::copy_to`]
4285 - [`*const T::read_unaligned`]
4286 - [`*const T::read_volatile`]
4287 - [`*const T::read`]
4289 - [`*const T::wrapping_add`]
4290 - [`*const T::wrapping_sub`]
4292 - [`*mut T::copy_to_nonoverlapping`]
4293 - [`*mut T::copy_to`]
4294 - [`*mut T::read_unaligned`]
4295 - [`*mut T::read_volatile`]
4297 - [`*mut T::replace`]
4300 - [`*mut T::wrapping_add`]
4301 - [`*mut T::wrapping_sub`]
4302 - [`*mut T::write_bytes`]
4303 - [`*mut T::write_unaligned`]
4304 - [`*mut T::write_volatile`]
4307 - [`FromUtf8Error::as_bytes`]
4308 - [`LocalKey::try_with`]
4309 - [`Option::cloned`]
4310 - [`btree_map::Entry::and_modify`]
4311 - [`fs::read_to_string`]
4314 - [`hash_map::Entry::and_modify`]
4315 - [`iter::FusedIterator`]
4316 - [`ops::RangeInclusive`]
4317 - [`ops::RangeToInclusive`]
4319 - [`slice::rotate_left`]
4320 - [`slice::rotate_right`]
4321 - [`String::retain`]
4326 - [Cargo will now output path to custom commands when `-v` is
4327 passed with `--list`][cargo/5041]
4328 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4332 - [The second edition of "The Rust Programming Language" book is now recommended
4333 over the first.][48404]
4338 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4339 syntax is now invalid.
4341 use std::ops::Fn as dyn;
4342 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4344 - [The result of dereferences are no longer promoted to `'static`.][47408]
4348 const PAIR: &(i32, i32) = &(0, 1);
4349 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4352 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4353 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4355 - [Removed hoedown from rustdoc.][48274]
4356 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4358 [46882]: https://github.com/rust-lang/rust/pull/46882
4359 [47379]: https://github.com/rust-lang/rust/pull/47379
4360 [47408]: https://github.com/rust-lang/rust/pull/47408
4361 [47813]: https://github.com/rust-lang/rust/pull/47813
4362 [48056]: https://github.com/rust-lang/rust/pull/48056
4363 [48125]: https://github.com/rust-lang/rust/pull/48125
4364 [48166]: https://github.com/rust-lang/rust/pull/48166
4365 [48235]: https://github.com/rust-lang/rust/pull/48235
4366 [48274]: https://github.com/rust-lang/rust/pull/48274
4367 [48281]: https://github.com/rust-lang/rust/pull/48281
4368 [48296]: https://github.com/rust-lang/rust/pull/48296
4369 [48326]: https://github.com/rust-lang/rust/pull/48326
4370 [48359]: https://github.com/rust-lang/rust/pull/48359
4371 [48404]: https://github.com/rust-lang/rust/pull/48404
4372 [48481]: https://github.com/rust-lang/rust/pull/48481
4373 [48516]: https://github.com/rust-lang/rust/pull/48516
4374 [48628]: https://github.com/rust-lang/rust/pull/48628
4375 [48629]: https://github.com/rust-lang/rust/pull/48629
4376 [48657]: https://github.com/rust-lang/rust/pull/48657
4377 [48735]: https://github.com/rust-lang/rust/pull/48735
4378 [48978]: https://github.com/rust-lang/rust/pull/48978
4379 [49101]: https://github.com/rust-lang/rust/pull/49101
4380 [49109]: https://github.com/rust-lang/rust/pull/49109
4381 [49121]: https://github.com/rust-lang/rust/pull/49121
4382 [49162]: https://github.com/rust-lang/rust/pull/49162
4383 [49184]: https://github.com/rust-lang/rust/pull/49184
4384 [49234]: https://github.com/rust-lang/rust/pull/49234
4385 [49255]: https://github.com/rust-lang/rust/pull/49255
4386 [49299]: https://github.com/rust-lang/rust/pull/49299
4387 [49305]: https://github.com/rust-lang/rust/pull/49305
4388 [49394]: https://github.com/rust-lang/rust/pull/49394
4389 [49458]: https://github.com/rust-lang/rust/pull/49458
4390 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4391 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4392 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4393 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4394 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4395 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4396 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4397 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4398 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4399 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4400 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4401 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4402 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4403 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4404 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4405 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4406 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4407 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4408 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4409 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4410 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4411 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4412 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4413 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4414 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4415 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4416 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4417 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4418 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4419 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4420 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4421 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4422 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4423 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4424 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4425 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4426 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4427 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4428 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4429 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4430 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4431 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4434 Version 1.25.0 (2018-03-29)
4435 ==========================
4439 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4440 - [You can now use nested groups of imports.][47948]
4441 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4442 - [You can now have `|` at the start of a match arm.][47947] e.g.
4444 enum Foo { A, B, C }
4450 | Foo::B => println!("AB"),
4451 | Foo::C => println!("C"),
4458 - [Upgraded to LLVM 6.][47828]
4459 - [Added `-C lto=val` option.][47521]
4460 - [Added `i586-unknown-linux-musl` target][47282]
4464 - [Impl Send for `process::Command` on Unix.][47760]
4465 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4466 - [`UnsafeCell::into_inner` is now safe.][47204]
4467 - [Implement libstd for CloudABI.][47268]
4468 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4469 - [Implement `AsRef<Path>` for Component][46985]
4470 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4471 - [Moved `Duration` to libcore.][46666]
4475 - [`Location::column`]
4478 The following functions can now be used in a constant expression.
4479 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4480 - [`Duration::new`][47300]
4481 - [`Duration::from_secs`][47300]
4482 - [`Duration::from_millis`][47300]
4486 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4487 - [`cargo new` now defaults to creating a binary crate, instead of a
4488 library crate.][cargo/5029]
4492 - [Rust by example is now shipped with new releases][46196]
4496 - [Deprecated `net::lookup_host`.][47510]
4497 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4498 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4499 around indexing operations (see [#47349][47349]). This has been fixed (which also
4500 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4501 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4503 [33903]: https://github.com/rust-lang/rust/pull/33903
4504 [47947]: https://github.com/rust-lang/rust/pull/47947
4505 [47948]: https://github.com/rust-lang/rust/pull/47948
4506 [47760]: https://github.com/rust-lang/rust/pull/47760
4507 [47790]: https://github.com/rust-lang/rust/pull/47790
4508 [47828]: https://github.com/rust-lang/rust/pull/47828
4509 [47398]: https://github.com/rust-lang/rust/pull/47398
4510 [47510]: https://github.com/rust-lang/rust/pull/47510
4511 [47521]: https://github.com/rust-lang/rust/pull/47521
4512 [47204]: https://github.com/rust-lang/rust/pull/47204
4513 [47251]: https://github.com/rust-lang/rust/pull/47251
4514 [47268]: https://github.com/rust-lang/rust/pull/47268
4515 [47282]: https://github.com/rust-lang/rust/pull/47282
4516 [47300]: https://github.com/rust-lang/rust/pull/47300
4517 [47349]: https://github.com/rust-lang/rust/pull/47349
4518 [46931]: https://github.com/rust-lang/rust/pull/46931
4519 [46985]: https://github.com/rust-lang/rust/pull/46985
4520 [47006]: https://github.com/rust-lang/rust/pull/47006
4521 [46830]: https://github.com/rust-lang/rust/pull/46830
4522 [46095]: https://github.com/rust-lang/rust/pull/46095
4523 [46666]: https://github.com/rust-lang/rust/pull/46666
4524 [46196]: https://github.com/rust-lang/rust/pull/46196
4525 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4526 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4527 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4528 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4529 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4532 Version 1.24.1 (2018-03-01)
4533 ==========================
4535 - [Do not abort when unwinding through FFI][48251]
4536 - [Emit UTF-16 files for linker arguments on Windows][48318]
4537 - [Make the error index generator work again][48308]
4538 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4540 [48251]: https://github.com/rust-lang/rust/issues/48251
4541 [48308]: https://github.com/rust-lang/rust/issues/48308
4542 [48318]: https://github.com/rust-lang/rust/issues/48318
4543 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4546 Version 1.24.0 (2018-02-15)
4547 ==========================
4551 - [External `sysv64` ffi is now available.][46528]
4552 eg. `extern "sysv64" fn foo () {}`
4556 - [rustc now uses 16 codegen units by default for release builds.][46910]
4557 For the fastest builds, utilize `codegen-units=1`.
4558 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4559 - [Add `aarch64-unknown-openbsd` support][46760]
4563 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4564 improvement in performance in the majority of cases.
4565 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4566 with Windows.][46798]
4567 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4568 - [impl `From<bool>` for `AtomicBool`][46293]
4569 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4570 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4571 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4572 - [float::from_bits now just uses transmute.][46012] This provides
4573 some optimisations from LLVM.
4574 - [Copied `AsciiExt` methods onto `char`][46077]
4575 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4576 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4577 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4578 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4582 - [`RefCell::replace`]
4584 - [`atomic::spin_loop_hint`]
4586 The following functions can now be used in a constant expression.
4587 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4589 - [`AtomicBool::new`][46287]
4590 - [`AtomicUsize::new`][46287]
4591 - [`AtomicIsize::new`][46287]
4592 - [`AtomicPtr::new`][46287]
4593 - [`Cell::new`][46287]
4594 - [`{integer}::min_value`][46287]
4595 - [`{integer}::max_value`][46287]
4596 - [`mem::size_of`][46287]
4597 - [`mem::align_of`][46287]
4598 - [`ptr::null`][46287]
4599 - [`ptr::null_mut`][46287]
4600 - [`RefCell::new`][46287]
4601 - [`UnsafeCell::new`][46287]
4605 - [Added a `workspace.default-members` config that
4606 overrides implied `--all` in virtual workspaces.][cargo/4743]
4607 - [Enable incremental by default on development builds.][cargo/4817] Also added
4608 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4609 per-project or global basis respectively.
4616 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4617 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4618 in accordance with IETF RFC 4291 §2.2.
4619 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4620 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4621 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4622 - [Leading zeros in tuple struct members is now an error][47084]
4623 - [`column!()` macro is one-based instead of zero-based][46977]
4624 - [`fmt::Arguments` can no longer be shared across threads][45198]
4625 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4626 - [Cargo sets a different working directory for the compiler][cargo/4788]
4628 [44884]: https://github.com/rust-lang/rust/pull/44884
4629 [45198]: https://github.com/rust-lang/rust/pull/45198
4630 [45506]: https://github.com/rust-lang/rust/pull/45506
4631 [45904]: https://github.com/rust-lang/rust/pull/45904
4632 [45990]: https://github.com/rust-lang/rust/pull/45990
4633 [46012]: https://github.com/rust-lang/rust/pull/46012
4634 [46077]: https://github.com/rust-lang/rust/pull/46077
4635 [46094]: https://github.com/rust-lang/rust/pull/46094
4636 [46284]: https://github.com/rust-lang/rust/pull/46284
4637 [46287]: https://github.com/rust-lang/rust/pull/46287
4638 [46293]: https://github.com/rust-lang/rust/pull/46293
4639 [46528]: https://github.com/rust-lang/rust/pull/46528
4640 [46671]: https://github.com/rust-lang/rust/pull/46671
4641 [46713]: https://github.com/rust-lang/rust/pull/46713
4642 [46735]: https://github.com/rust-lang/rust/pull/46735
4643 [46749]: https://github.com/rust-lang/rust/pull/46749
4644 [46760]: https://github.com/rust-lang/rust/pull/46760
4645 [46798]: https://github.com/rust-lang/rust/pull/46798
4646 [46828]: https://github.com/rust-lang/rust/pull/46828
4647 [46831]: https://github.com/rust-lang/rust/pull/46831
4648 [46833]: https://github.com/rust-lang/rust/pull/46833
4649 [46910]: https://github.com/rust-lang/rust/pull/46910
4650 [46977]: https://github.com/rust-lang/rust/pull/46977
4651 [47018]: https://github.com/rust-lang/rust/pull/47018
4652 [47080]: https://github.com/rust-lang/rust/pull/47080
4653 [47084]: https://github.com/rust-lang/rust/pull/47084
4654 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4655 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4656 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4657 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4658 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4659 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4662 Version 1.23.0 (2018-01-04)
4663 ==========================
4667 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4668 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4669 Which should fix some confusing errors in some operations.
4673 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4674 undefined behavior.][45920]
4675 - [rustc now suggests renaming import if names clash.][45660]
4676 - [Display errors/warnings correctly when there are zero-width or
4677 wide characters.][45711]
4678 - [rustc now avoids unnecessary copies of arguments that are
4679 simple bindings][45380] This should improve memory usage on average by 5-10%.
4680 - [Updated musl used to build musl rustc to 1.1.17][45393]
4684 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4685 - [Implement Hash for raw pointers to unsized types][45483]
4686 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4687 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4688 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4689 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4690 and `<*mut T>::as_mut`][44932]
4691 - [Optimized `Thread::{park, unpark}` implementation][45524]
4692 - [Improved `SliceExt::binary_search` performance.][45333]
4693 - [impl `FromIterator<()>` for `()`][45379]
4694 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4702 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4703 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4704 - [Added unit test checking to `cargo check`][cargo/4592]
4705 - [Cargo now lets you install a specific version
4706 using `cargo install --version`][cargo/4637]
4710 - [Releases now ship with the Cargo book documentation.][45692]
4711 - [rustdoc now prints rendering warnings on every run.][45324]
4715 - [Changes have been made to type equality to make it more correct,
4716 in rare cases this could break some code.][45853] [Tracking issue for
4717 further information][45852]
4718 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4719 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4720 Android 9, the minimum supported version is Android 14.
4721 - [Bumped the minimum LLVM to 3.9][45326]
4723 [44042]: https://github.com/rust-lang/rust/pull/44042
4724 [44932]: https://github.com/rust-lang/rust/pull/44932
4725 [45267]: https://github.com/rust-lang/rust/pull/45267
4726 [45324]: https://github.com/rust-lang/rust/pull/45324
4727 [45326]: https://github.com/rust-lang/rust/pull/45326
4728 [45333]: https://github.com/rust-lang/rust/pull/45333
4729 [45379]: https://github.com/rust-lang/rust/pull/45379
4730 [45380]: https://github.com/rust-lang/rust/pull/45380
4731 [45393]: https://github.com/rust-lang/rust/pull/45393
4732 [45435]: https://github.com/rust-lang/rust/pull/45435
4733 [45483]: https://github.com/rust-lang/rust/pull/45483
4734 [45524]: https://github.com/rust-lang/rust/pull/45524
4735 [45571]: https://github.com/rust-lang/rust/pull/45571
4736 [45580]: https://github.com/rust-lang/rust/pull/45580
4737 [45610]: https://github.com/rust-lang/rust/pull/45610
4738 [45660]: https://github.com/rust-lang/rust/pull/45660
4739 [45692]: https://github.com/rust-lang/rust/pull/45692
4740 [45711]: https://github.com/rust-lang/rust/pull/45711
4741 [45772]: https://github.com/rust-lang/rust/pull/45772
4742 [45852]: https://github.com/rust-lang/rust/issues/45852
4743 [45853]: https://github.com/rust-lang/rust/pull/45853
4744 [45887]: https://github.com/rust-lang/rust/pull/45887
4745 [45920]: https://github.com/rust-lang/rust/pull/45920
4746 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4747 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4748 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4751 Version 1.22.1 (2017-11-22)
4752 ==========================
4754 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4756 [46183]: https://github.com/rust-lang/rust/pull/46183
4758 Version 1.22.0 (2017-11-22)
4759 ==========================
4763 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4764 - [Now accepts underscores in unicode escapes][43716]
4765 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4766 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4770 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4771 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4772 This should decrease compile times for debug builds.
4773 - [strict memory alignment now enabled on ARMv6][45094]
4774 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4778 - [Allow atomic operations up to 32 bits
4779 on `armv5te_unknown_linux_gnueabi`][44978]
4780 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4781 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4782 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4783 - [Properly detect overflow in `Instant += Duration`.][44220]
4784 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4785 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4786 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4793 - [Cargo will now build multi file examples in subdirectories of the `examples`
4794 folder that have a `main.rs` file.][cargo/4496]
4795 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4796 the old format will continue to work and can be updated with `cargo update`.
4797 - [Now supports vendoring git repositories][cargo/3992]
4801 - [`libbacktrace` is now available on Apple platforms.][44251]
4802 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4803 This now lets you specify that a given code example will fail to compile.
4807 - [The minimum Android version that rustc can build for has been bumped
4808 to `4.0` from `2.3`][45656]
4809 - [Allowing `T op= &T` for numeric types has broken some type
4810 inference cases][45480]
4813 [42526]: https://github.com/rust-lang/rust/pull/42526
4814 [43017]: https://github.com/rust-lang/rust/pull/43017
4815 [43716]: https://github.com/rust-lang/rust/pull/43716
4816 [43949]: https://github.com/rust-lang/rust/pull/43949
4817 [44015]: https://github.com/rust-lang/rust/pull/44015
4818 [44220]: https://github.com/rust-lang/rust/pull/44220
4819 [44251]: https://github.com/rust-lang/rust/pull/44251
4820 [44287]: https://github.com/rust-lang/rust/pull/44287
4821 [44303]: https://github.com/rust-lang/rust/pull/44303
4822 [44456]: https://github.com/rust-lang/rust/pull/44456
4823 [44466]: https://github.com/rust-lang/rust/pull/44466
4824 [44895]: https://github.com/rust-lang/rust/pull/44895
4825 [44966]: https://github.com/rust-lang/rust/pull/44966
4826 [44978]: https://github.com/rust-lang/rust/pull/44978
4827 [45041]: https://github.com/rust-lang/rust/pull/45041
4828 [45064]: https://github.com/rust-lang/rust/pull/45064
4829 [45075]: https://github.com/rust-lang/rust/pull/45075
4830 [45094]: https://github.com/rust-lang/rust/pull/45094
4831 [45095]: https://github.com/rust-lang/rust/pull/45095
4832 [45480]: https://github.com/rust-lang/rust/issues/45480
4833 [45656]: https://github.com/rust-lang/rust/pull/45656
4834 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4835 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4836 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4843 Version 1.21.0 (2017-10-12)
4844 ==========================
4848 - [You can now use static references for literals.][43838]
4852 let x: &'static u32 = &0;
4855 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4858 my_macro!(Vec<i32>::new); // Always worked
4859 my_macro!(Vec::<i32>::new); // Now works
4864 - [Upgraded jemalloc to 4.5.0][43911]
4865 - [Enabled unwinding panics on Redox][43917]
4866 - [Now runs LLVM in parallel during translation phase.][43506]
4867 This should reduce peak memory usage.
4871 - [Generate builtin impls for `Clone` for all arrays and tuples that
4872 are `T: Clone`][43690]
4873 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4874 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4875 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4880 [`std::mem::discriminant`]
4884 - [You can now call `cargo install` with multiple package names][cargo/4216]
4885 - [Cargo commands inside a virtual workspace will now implicitly
4886 pass `--all`][cargo/4335]
4887 - [Added a `[patch]` section to `Cargo.toml` to handle
4888 prepublication dependencies][cargo/4123] [RFC 1969]
4889 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4890 like patterns][cargo/4270]
4891 - [Added the `--all-targets` option][cargo/4400]
4892 - [Using required dependencies as a feature is now deprecated and emits
4893 a warning][cargo/4364]
4898 - [Cargo docs are moving][43916]
4899 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4900 - [The rustdoc book is now available][43863]
4901 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4902 - [Added a preview of RLS has been made available through rustup][44204]
4903 Install with `rustup component add rls-preview`
4904 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4905 Previously only showed `std::os::unix`.
4909 - [Changes in method matching against higher-ranked types][43880] This may cause
4910 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4911 - [rustc's JSON error output's byte position start at top of file.][42973]
4912 Was previously relative to the rustc's internal `CodeMap` struct which
4913 required the unstable library `libsyntax` to correctly use.
4914 - [`unused_results` lint no longer ignores booleans][43728]
4916 [42565]: https://github.com/rust-lang/rust/pull/42565
4917 [42973]: https://github.com/rust-lang/rust/pull/42973
4918 [43348]: https://github.com/rust-lang/rust/pull/43348
4919 [43459]: https://github.com/rust-lang/rust/pull/43459
4920 [43506]: https://github.com/rust-lang/rust/pull/43506
4921 [43540]: https://github.com/rust-lang/rust/pull/43540
4922 [43690]: https://github.com/rust-lang/rust/pull/43690
4923 [43728]: https://github.com/rust-lang/rust/pull/43728
4924 [43838]: https://github.com/rust-lang/rust/pull/43838
4925 [43863]: https://github.com/rust-lang/rust/pull/43863
4926 [43880]: https://github.com/rust-lang/rust/pull/43880
4927 [43911]: https://github.com/rust-lang/rust/pull/43911
4928 [43916]: https://github.com/rust-lang/rust/pull/43916
4929 [43917]: https://github.com/rust-lang/rust/pull/43917
4930 [44204]: https://github.com/rust-lang/rust/pull/44204
4931 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4932 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4933 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4934 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4935 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4936 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4937 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4938 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4939 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4941 Version 1.20.0 (2017-08-31)
4942 ===========================
4946 - [Associated constants are now stabilised.][42809]
4947 - [A lot of macro bugs are now fixed.][42913]
4952 - [Struct fields are now properly coerced to the expected field type.][42807]
4953 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4954 `wasm32-experimental-emscripten` target.
4955 - [Changed some of the error messages to be more helpful.][42033]
4956 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4958 - [rustc now reports the total number of errors on compilation failure][43015]
4959 previously this was only the number of errors in the pass that failed.
4960 - [Expansion in rustc has been sped up 29x.][42533]
4961 - [added `msp430-none-elf` target.][43099]
4962 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4964 - [Fixes backtraces on Redox][43228]
4965 - [rustc now identifies different versions of same crate when absolute paths of
4966 different types match in an error message.][42826]
4972 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4973 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4975 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4976 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4977 - [Impl `Clone` for `DefaultHasher`.][42799]
4978 - [Impl `Sync` for `SyncSender`.][42397]
4979 - [Impl `FromStr` for `char`][42271]
4980 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4982 - [allow messages in the `unimplemented!()` macro.][42155]
4983 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4984 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4985 - [Upgrade to Unicode 10.0.0][42999]
4986 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4987 - [Skip the main thread's manual stack guard on Linux][43072]
4988 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4989 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4991 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4996 - [`CStr::into_c_string`]
4997 - [`CString::as_c_str`]
4998 - [`CString::into_boxed_c_str`]
4999 - [`Chain::get_mut`]
5000 - [`Chain::get_ref`]
5001 - [`Chain::into_inner`]
5002 - [`Option::get_or_insert_with`]
5003 - [`Option::get_or_insert`]
5004 - [`OsStr::into_os_string`]
5005 - [`OsString::into_boxed_os_str`]
5008 - [`Utf8Error::error_len`]
5009 - [`char::EscapeDebug`]
5010 - [`char::escape_debug`]
5011 - [`compile_error!`]
5012 - [`f32::from_bits`]
5014 - [`f64::from_bits`]
5016 - [`mem::ManuallyDrop`]
5017 - [`slice::sort_unstable_by_key`]
5018 - [`slice::sort_unstable_by`]
5019 - [`slice::sort_unstable`]
5020 - [`str::from_boxed_utf8_unchecked`]
5021 - [`str::as_bytes_mut`]
5022 - [`str::as_bytes_mut`]
5023 - [`str::from_utf8_mut`]
5024 - [`str::from_utf8_unchecked_mut`]
5026 - [`str::get_unchecked_mut`]
5027 - [`str::get_unchecked`]
5029 - [`str::into_boxed_bytes`]
5034 - [Cargo API token location moved from `~/.cargo/config` to
5035 `~/.cargo/credentials`.][cargo/3978]
5036 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5037 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5038 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5039 - [You can now specify version of a binary when installed through
5040 `cargo install` using `--vers`.][cargo/4229]
5041 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5042 failure.][cargo/4248]
5043 - [Changed the convention around which file is the crate root.][cargo/4259]
5044 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5045 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5050 - [Functions with `'static` in their return types will now not be as usable as
5051 if they were using lifetime parameters instead.][42417]
5052 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5053 takes the sign of NaN into account where previously didn't.][42430]
5055 [42033]: https://github.com/rust-lang/rust/pull/42033
5056 [42155]: https://github.com/rust-lang/rust/pull/42155
5057 [42271]: https://github.com/rust-lang/rust/pull/42271
5058 [42397]: https://github.com/rust-lang/rust/pull/42397
5059 [42417]: https://github.com/rust-lang/rust/pull/42417
5060 [42430]: https://github.com/rust-lang/rust/pull/42430
5061 [42431]: https://github.com/rust-lang/rust/pull/42431
5062 [42533]: https://github.com/rust-lang/rust/pull/42533
5063 [42571]: https://github.com/rust-lang/rust/pull/42571
5064 [42613]: https://github.com/rust-lang/rust/pull/42613
5065 [42799]: https://github.com/rust-lang/rust/pull/42799
5066 [42807]: https://github.com/rust-lang/rust/pull/42807
5067 [42809]: https://github.com/rust-lang/rust/pull/42809
5068 [42822]: https://github.com/rust-lang/rust/pull/42822
5069 [42826]: https://github.com/rust-lang/rust/pull/42826
5070 [42854]: https://github.com/rust-lang/rust/pull/42854
5071 [42913]: https://github.com/rust-lang/rust/pull/42913
5072 [42999]: https://github.com/rust-lang/rust/pull/42999
5073 [43011]: https://github.com/rust-lang/rust/pull/43011
5074 [43015]: https://github.com/rust-lang/rust/pull/43015
5075 [43072]: https://github.com/rust-lang/rust/pull/43072
5076 [43077]: https://github.com/rust-lang/rust/pull/43077
5077 [43097]: https://github.com/rust-lang/rust/pull/43097
5078 [43099]: https://github.com/rust-lang/rust/pull/43099
5079 [43170]: https://github.com/rust-lang/rust/pull/43170
5080 [43178]: https://github.com/rust-lang/rust/pull/43178
5081 [43185]: https://github.com/rust-lang/rust/pull/43185
5082 [43228]: https://github.com/rust-lang/rust/pull/43228
5083 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5084 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5085 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5086 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5087 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5088 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5089 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5090 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5091 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5092 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5093 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5094 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5095 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5096 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5097 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5098 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5099 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5100 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5101 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5102 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5103 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5104 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5105 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5106 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5107 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5108 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5109 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5110 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5111 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5112 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5113 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5114 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5115 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5116 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5117 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5118 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5119 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5120 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5121 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5124 Version 1.19.0 (2017-07-20)
5125 ===========================
5130 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5131 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5132 - [Macro recursion limit increased to 1024 from 64.][41676]
5133 - [Added lint for detecting unused macros.][41907]
5134 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5135 For example: `let x = loop { break 7; };`
5136 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5137 contain `Copy` types and cannot have a `Drop` implementation.
5138 Example: `union Foo { bar: u8, baz: usize }`
5139 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5140 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5145 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5146 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5147 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5148 you should use `--target armv7-linux-androideabi`.
5149 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5150 - [Minor optimisation of string operations.][42037]
5151 - [Compiler error message is now `aborting due to previous error(s)` instead of
5152 `aborting due to N previous errors`][42150] This was previously inaccurate and
5153 would only count certain kinds of errors.
5154 - [The compiler now supports Visual Studio 2017][42225]
5155 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5156 - [Added a lot][42264] of [new error codes][42302]
5157 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5158 libraries with C Run-time Libraries(CRT) to be statically linked.
5159 - [Fixed various ARM codegen bugs][42740]
5164 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5165 `Extend<Cow<'a, str>>`][41449]
5166 - [`Vec` now implements `From<&mut [T]>`][41530]
5167 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5168 - [`SplitWhitespace` now implements `Clone`][41659]
5169 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5171 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5172 macros, but for printing to stderr.
5177 - [`OsString::shrink_to_fit`]
5180 - [`thread::ThreadId`]
5185 - [Build scripts can now add environment variables to the environment
5186 the crate is being compiled in.
5187 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5188 - [Subcommands now replace the current process rather than spawning a new
5189 child process][cargo/3970]
5190 - [Workspace members can now accept glob file patterns][cargo/3979]
5191 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5192 the members in a given workspace.][cargo/3988]
5193 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5194 - [Target directory path is now in the cargo metadata][cargo/4022]
5195 - [Cargo no longer checks out a local working directory for the
5196 crates.io index][cargo/4026] This should provide smaller file size for the
5197 registry, and improve cloning times, especially on Windows machines.
5198 - [Added an `--exclude` option for excluding certain packages when using the
5199 `--all` option][cargo/4031]
5200 - [Cargo will now automatically retry when receiving a 5xx error
5201 from crates.io][cargo/4032]
5202 - [The `--features` option now accepts multiple comma or space
5203 delimited values.][cargo/4084]
5204 - [Added support for custom target specific runners][cargo/3954]
5209 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5211 - [Rust will now release XZ compressed packages][rust-installer/57]
5212 - [rustup will now prefer to download rust packages with
5213 XZ compression][rustup/1100] over GZip packages.
5214 - [Added the ability to escape `#` in rust documentation][41785] By adding
5215 additional `#`'s ie. `##` is now `#`
5220 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5221 - [`-Z` flags are now no longer allowed to be used on the stable
5222 compiler.][41751] This has been a warning for a year previous to this.
5223 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5224 longer works][42844]. Users should migrate to the built-in `check`
5225 command, which has been available since 1.16.
5226 - [Ending a float literal with `._` is now a hard error.
5227 Example: `42._` .][41946]
5228 - [Any use of a private `extern crate` outside of its module is now a
5229 hard error.][36886] This was previously a warning.
5230 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5231 relative while the `::` prefix makes a path absolute, but was ignored and the
5232 path was relative regardless.
5233 - [Floating point constants in match patterns is now a hard error][36890]
5234 This was previously a warning.
5235 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5236 match patterns is now a hard error][36891] This was previously a warning.
5237 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5239 - [From the pound escape, lines consisting of multiple `#`s are
5241 - [It is an error to re-export private enum variants][42460]. This is
5242 known to break a number of crates that depend on an older version of
5244 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5245 to use it to find the linker, and the build will fail where it did
5246 not previously][42607]
5248 [36886]: https://github.com/rust-lang/rust/issues/36886
5249 [36888]: https://github.com/rust-lang/rust/issues/36888
5250 [36890]: https://github.com/rust-lang/rust/issues/36890
5251 [36891]: https://github.com/rust-lang/rust/issues/36891
5252 [36892]: https://github.com/rust-lang/rust/issues/36892
5253 [37406]: https://github.com/rust-lang/rust/issues/37406
5254 [39983]: https://github.com/rust-lang/rust/pull/39983
5255 [41145]: https://github.com/rust-lang/rust/pull/41145
5256 [41192]: https://github.com/rust-lang/rust/pull/41192
5257 [41258]: https://github.com/rust-lang/rust/pull/41258
5258 [41370]: https://github.com/rust-lang/rust/pull/41370
5259 [41449]: https://github.com/rust-lang/rust/pull/41449
5260 [41530]: https://github.com/rust-lang/rust/pull/41530
5261 [41624]: https://github.com/rust-lang/rust/pull/41624
5262 [41656]: https://github.com/rust-lang/rust/pull/41656
5263 [41659]: https://github.com/rust-lang/rust/pull/41659
5264 [41676]: https://github.com/rust-lang/rust/pull/41676
5265 [41751]: https://github.com/rust-lang/rust/pull/41751
5266 [41764]: https://github.com/rust-lang/rust/pull/41764
5267 [41785]: https://github.com/rust-lang/rust/pull/41785
5268 [41873]: https://github.com/rust-lang/rust/pull/41873
5269 [41907]: https://github.com/rust-lang/rust/pull/41907
5270 [41946]: https://github.com/rust-lang/rust/pull/41946
5271 [42016]: https://github.com/rust-lang/rust/pull/42016
5272 [42037]: https://github.com/rust-lang/rust/pull/42037
5273 [42068]: https://github.com/rust-lang/rust/pull/42068
5274 [42150]: https://github.com/rust-lang/rust/pull/42150
5275 [42162]: https://github.com/rust-lang/rust/pull/42162
5276 [42225]: https://github.com/rust-lang/rust/pull/42225
5277 [42264]: https://github.com/rust-lang/rust/pull/42264
5278 [42302]: https://github.com/rust-lang/rust/pull/42302
5279 [42460]: https://github.com/rust-lang/rust/issues/42460
5280 [42607]: https://github.com/rust-lang/rust/issues/42607
5281 [42740]: https://github.com/rust-lang/rust/pull/42740
5282 [42844]: https://github.com/rust-lang/rust/issues/42844
5283 [42948]: https://github.com/rust-lang/rust/pull/42948
5284 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5285 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5286 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5287 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5288 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5289 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5290 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5291 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5292 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5293 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5294 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5295 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5296 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5297 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5298 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5299 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5300 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5301 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5302 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5303 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5304 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5305 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5308 Version 1.18.0 (2017-06-08)
5309 ===========================
5314 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5315 make the item visible to just that module tree. Also accepts the keyword
5316 `crate` to make something public to the whole crate but not users of the
5317 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5318 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5319 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5320 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5321 types like `Write + Send`, trailing `+` are now supported in trait objects,
5322 and better error reporting for trait objects starting with `?Sized`.
5323 - [0e+10 is now a valid floating point literal][40589]
5324 - [Now warns if you bind a lifetime parameter to 'static][40734]
5325 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5326 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5327 representation in some cases.][40377]
5332 - [rustc can now emit mir with `--emit mir`][39891]
5333 - [Improved LLVM IR for trivial functions][40367]
5334 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5335 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5336 opportunities found through profiling
5337 - [Improved backtrace formatting when panicking][38165]
5342 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5343 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5344 iteration or reallocation.
5345 - [Simplified HashMap Bucket interface][40561] provides performance
5346 improvements for iterating and cloning.
5347 - [Specialize Vec::from_elem to use calloc][40409]
5348 - [Fixed Race condition in fs::create_dir_all][39799]
5349 - [No longer caching stdio on Windows][40516]
5350 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5351 2.50%~ faster and in one case now 12.50% faster.
5352 - [Optimized `AtomicBool::fetch_nand`][41143]
5357 - [`Child::try_wait`]
5358 - [`HashMap::retain`]
5359 - [`HashSet::retain`]
5361 - [`TcpStream::peek`]
5362 - [`UdpSocket::peek`]
5363 - [`UdpSocket::peek_from`]
5368 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5369 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5370 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5371 - [Added Android build support][cargo/3885]
5372 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5373 of a certain type, for example `cargo build --bins` will build all
5375 - [Added support for haiku][cargo/3952]
5380 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5381 - [Added rust-windbg script for better debugging on Windows][39983]
5382 - [Rust now uses the official cross compiler for NetBSD][40612]
5383 - [rustdoc now accepts `#` at the start of files][40828]
5384 - [Fixed jemalloc support for musl][41168]
5389 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5390 always placed after the sign if it exists and before the digits. With the `#`
5391 flag the zeroes are placed after the prefix and before the digits.
5392 - [Due to the struct field optimisation][40377], using `transmute` on structs
5393 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5394 always been undefined behavior, but is now more likely to break in practice.
5395 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5396 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5397 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5398 - [Overlapping inherent `impl`s are now a hard error][40728]
5399 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5400 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5401 `out.asm` and `out.ll` instead of only one of the filetypes.
5402 - [ calling a function that returns `Self` will no longer work][41805] when
5403 the size of `Self` cannot be statically determined.
5404 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5405 this has caused a few regressions namely:
5407 - Changed the link order of local static/dynamic libraries (respecting the
5408 order on given rather than having the compiler reorder).
5409 - Changed how MinGW is linked, native code linked to dynamic libraries
5410 may require manually linking to the gcc support library (for the native
5413 [38165]: https://github.com/rust-lang/rust/pull/38165
5414 [39799]: https://github.com/rust-lang/rust/pull/39799
5415 [39891]: https://github.com/rust-lang/rust/pull/39891
5416 [39983]: https://github.com/rust-lang/rust/pull/39983
5417 [40043]: https://github.com/rust-lang/rust/pull/40043
5418 [40241]: https://github.com/rust-lang/rust/pull/40241
5419 [40338]: https://github.com/rust-lang/rust/pull/40338
5420 [40367]: https://github.com/rust-lang/rust/pull/40367
5421 [40377]: https://github.com/rust-lang/rust/pull/40377
5422 [40409]: https://github.com/rust-lang/rust/pull/40409
5423 [40516]: https://github.com/rust-lang/rust/pull/40516
5424 [40556]: https://github.com/rust-lang/rust/pull/40556
5425 [40561]: https://github.com/rust-lang/rust/pull/40561
5426 [40589]: https://github.com/rust-lang/rust/pull/40589
5427 [40612]: https://github.com/rust-lang/rust/pull/40612
5428 [40723]: https://github.com/rust-lang/rust/pull/40723
5429 [40728]: https://github.com/rust-lang/rust/pull/40728
5430 [40731]: https://github.com/rust-lang/rust/pull/40731
5431 [40734]: https://github.com/rust-lang/rust/pull/40734
5432 [40805]: https://github.com/rust-lang/rust/pull/40805
5433 [40807]: https://github.com/rust-lang/rust/pull/40807
5434 [40828]: https://github.com/rust-lang/rust/pull/40828
5435 [40870]: https://github.com/rust-lang/rust/pull/40870
5436 [41085]: https://github.com/rust-lang/rust/pull/41085
5437 [41143]: https://github.com/rust-lang/rust/pull/41143
5438 [41168]: https://github.com/rust-lang/rust/pull/41168
5439 [41270]: https://github.com/rust-lang/rust/issues/41270
5440 [41469]: https://github.com/rust-lang/rust/pull/41469
5441 [41805]: https://github.com/rust-lang/rust/issues/41805
5442 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5443 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5444 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5445 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5446 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5447 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5448 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5449 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5450 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5451 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5452 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5453 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5454 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5455 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5458 Version 1.17.0 (2017-04-27)
5459 ===========================
5464 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5465 * [Fields of structs may be initialized without duplicating the field/variable
5466 names][39761]. [RFC 1682]
5467 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5468 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5469 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5470 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5471 `'b`. Soundness fix.
5472 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5473 * [Static variables may contain references to other statics][40027]
5478 * [Exit quickly on only `--emit dep-info`][40336]
5479 * [Make `-C relocation-model` more correctly determine whether the linker
5480 creates a position-independent executable][40245]
5481 * [Add `-C overflow-checks` to directly control whether integer overflow
5483 * [The rustc type checker now checks items on demand instead of in a single
5484 in-order pass][40008]. This is mostly an internal refactoring in support of
5485 future work, including incremental type checking, but also resolves [RFC
5486 1647], allowing `Self` to appear in `impl` `where` clauses.
5487 * [Optimize vtable loads][39995]
5488 * [Turn off vectorization for Emscripten targets][39990]
5489 * [Provide suggestions for unknown macros imported with `use`][39953]
5490 * [Fix ICEs in path resolution][39939]
5491 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5492 * [Add clearer error message using `&str + &str`][39116]
5503 * [`Ordering::then`]
5504 * [`Ordering::then_with`]
5505 * [`BTreeMap::range`]
5506 * [`BTreeMap::range_mut`]
5507 * [`collections::Bound`]
5508 * [`process::abort`]
5509 * [`ptr::read_unaligned`]
5510 * [`ptr::write_unaligned`]
5511 * [`Result::expect_err`]
5514 * [`Cell::into_inner`]
5520 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5521 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5522 * [`String` implements `FromIterator<&char>`][40028]
5523 * `Box` [implements][40009] a number of new conversions:
5524 `From<Box<str>> for String`,
5525 `From<Box<[T]>> for Vec<T>`,
5526 `From<Box<CStr>> for CString`,
5527 `From<Box<OsStr>> for OsString`,
5528 `From<Box<Path>> for PathBuf`,
5529 `Into<Box<str>> for String`,
5530 `Into<Box<[T]>> for Vec<T>`,
5531 `Into<Box<CStr>> for CString`,
5532 `Into<Box<OsStr>> for OsString`,
5533 `Into<Box<Path>> for PathBuf`,
5534 `Default for Box<str>`,
5535 `Default for Box<CStr>`,
5536 `Default for Box<OsStr>`,
5537 `From<&CStr> for Box<CStr>`,
5538 `From<&OsStr> for Box<OsStr>`,
5539 `From<&Path> for Box<Path>`
5540 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5541 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5542 * [Slightly optimize `slice::sort`][39538]
5543 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5544 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5545 `Box<str>` implements `From<&str>`][39438]
5546 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5547 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5548 * [`format!` estimates the needed capacity before writing a string][39356]
5549 * [Support unprivileged symlink creation in Windows][38921]
5550 * [`PathBuf` implements `Default`][38764]
5551 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5552 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5553 and poor hash functions.
5558 * [Add `cargo check --all`][cargo/3731]
5559 * [Add an option to ignore SSL revocation checking][cargo/3699]
5560 * [Add `cargo run --package`][cargo/3691]
5561 * [Add `required_features`][cargo/3667]
5562 * [Assume `build.rs` is a build script][cargo/3664]
5563 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5568 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5570 * [The "Unstable Book" documents nightly-only features][ubook]
5571 * [Improve the style of the sidebar in rustdoc output][40265]
5572 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5573 * [Fix MSP430 breakage due to `i128`][40257]
5574 * [Preliminary Solaris/SPARCv9 support][39903]
5575 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5576 run without installing the MSVC runtime.
5577 * [`rustdoc --test` includes file names in test names][39788]
5578 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5579 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5580 * [Initial support for `aarch64-unknown-freebsd`][39491]
5581 * [Initial support for `i686-unknown-netbsd`][39426]
5582 * [This release no longer includes the old makefile build system][39431]. Rust
5583 is built with a custom build system, written in Rust, and with Cargo.
5584 * [Add Debug implementations for libcollection structs][39002]
5585 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5586 * [`--test-threads=0` produces an error][38945]
5587 * [`rustup` installs documentation by default][40526]
5588 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5589 WinDbg and Visual Studio to improve the debugging experience.
5594 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5595 workaround, either use MSVC 2015 or run vcvars.bat.
5596 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5597 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5598 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5600 * [`format!` and `Display::to_string` panic if an underlying formatting
5601 implementation returns an error][40117]. Previously the error was silently
5602 ignored. It is incorrect for `write_fmt` to return an error when writing
5604 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5605 crates were marked stable and could be accessed from the stable toolchain.
5606 * [Rust git source no longer includes vendored crates][39728]. Those that need
5607 to build with vendored crates should build from release tarballs.
5608 * [Fix inert attributes from `proc_macro_derives`][39572]
5609 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5610 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5612 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5613 existing code generally ignores the type of dead-code unless a type-hint is
5614 provided; this can cause surprising inference interactions particularly around
5615 defaulting. The new code uniformly ignores the result type of dead-code.
5616 * [Tuple-struct constructors with private fields are no longer visible][38932]
5617 * [Lifetime parameters that do not appear in the arguments are now considered
5618 early-bound][38897], resolving a soundness bug (#[32330]). The
5619 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5621 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5622 * [Make transmuting from fn item types to pointer-sized types a hard
5625 [27787]: https://github.com/rust-lang/rust/issues/27787
5626 [32330]: https://github.com/rust-lang/rust/issues/32330
5627 [34198]: https://github.com/rust-lang/rust/pull/34198
5628 [38161]: https://github.com/rust-lang/rust/pull/38161
5629 [38368]: https://github.com/rust-lang/rust/pull/38368
5630 [38584]: https://github.com/rust-lang/rust/issues/38584
5631 [38661]: https://github.com/rust-lang/rust/pull/38661
5632 [38764]: https://github.com/rust-lang/rust/pull/38764
5633 [38864]: https://github.com/rust-lang/rust/issues/38864
5634 [38897]: https://github.com/rust-lang/rust/pull/38897
5635 [38921]: https://github.com/rust-lang/rust/pull/38921
5636 [38932]: https://github.com/rust-lang/rust/pull/38932
5637 [38945]: https://github.com/rust-lang/rust/pull/38945
5638 [38981]: https://github.com/rust-lang/rust/pull/38981
5639 [39002]: https://github.com/rust-lang/rust/pull/39002
5640 [39116]: https://github.com/rust-lang/rust/pull/39116
5641 [39193]: https://github.com/rust-lang/rust/pull/39193
5642 [39265]: https://github.com/rust-lang/rust/pull/39265
5643 [39356]: https://github.com/rust-lang/rust/pull/39356
5644 [39372]: https://github.com/rust-lang/rust/pull/39372
5645 [39426]: https://github.com/rust-lang/rust/pull/39426
5646 [39431]: https://github.com/rust-lang/rust/pull/39431
5647 [39438]: https://github.com/rust-lang/rust/pull/39438
5648 [39440]: https://github.com/rust-lang/rust/pull/39440
5649 [39485]: https://github.com/rust-lang/rust/pull/39485
5650 [39491]: https://github.com/rust-lang/rust/pull/39491
5651 [39518]: https://github.com/rust-lang/rust/pull/39518
5652 [39538]: https://github.com/rust-lang/rust/pull/39538
5653 [39572]: https://github.com/rust-lang/rust/pull/39572
5654 [39633]: https://github.com/rust-lang/rust/pull/39633
5655 [39642]: https://github.com/rust-lang/rust/pull/39642
5656 [39728]: https://github.com/rust-lang/rust/pull/39728
5657 [39761]: https://github.com/rust-lang/rust/pull/39761
5658 [39788]: https://github.com/rust-lang/rust/pull/39788
5659 [39793]: https://github.com/rust-lang/rust/pull/39793
5660 [39837]: https://github.com/rust-lang/rust/pull/39837
5661 [39843]: https://github.com/rust-lang/rust/pull/39843
5662 [39851]: https://github.com/rust-lang/rust/pull/39851
5663 [39903]: https://github.com/rust-lang/rust/pull/39903
5664 [39939]: https://github.com/rust-lang/rust/pull/39939
5665 [39953]: https://github.com/rust-lang/rust/pull/39953
5666 [39960]: https://github.com/rust-lang/rust/pull/39960
5667 [39990]: https://github.com/rust-lang/rust/pull/39990
5668 [39995]: https://github.com/rust-lang/rust/pull/39995
5669 [40008]: https://github.com/rust-lang/rust/pull/40008
5670 [40009]: https://github.com/rust-lang/rust/pull/40009
5671 [40027]: https://github.com/rust-lang/rust/pull/40027
5672 [40028]: https://github.com/rust-lang/rust/pull/40028
5673 [40037]: https://github.com/rust-lang/rust/pull/40037
5674 [40117]: https://github.com/rust-lang/rust/pull/40117
5675 [40166]: https://github.com/rust-lang/rust/pull/40166
5676 [40245]: https://github.com/rust-lang/rust/pull/40245
5677 [40257]: https://github.com/rust-lang/rust/pull/40257
5678 [40261]: https://github.com/rust-lang/rust/pull/40261
5679 [40265]: https://github.com/rust-lang/rust/pull/40265
5680 [40319]: https://github.com/rust-lang/rust/pull/40319
5681 [40336]: https://github.com/rust-lang/rust/pull/40336
5682 [40526]: https://github.com/rust-lang/rust/pull/40526
5683 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5684 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5685 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5686 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5687 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5688 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5689 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5690 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5691 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5692 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5693 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5694 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5695 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5696 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5697 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5698 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5699 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5700 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5701 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5702 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5703 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5704 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5705 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5706 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5707 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5708 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5709 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5710 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5711 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5712 [mdbook]: https://crates.io/crates/mdbook
5713 [ubook]: https://doc.rust-lang.org/unstable-book/
5716 Version 1.16.0 (2017-03-16)
5717 ===========================
5722 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5723 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5724 match patterns][38069]
5725 * [Clean up semantics of `self` in an import list][38313]
5726 * [`Self` may appear in `impl` headers][38920]
5727 * [`Self` may appear in struct expressions][39282]
5732 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5733 a `.rmeta` file containing only crate metadata][38571]. This can be
5734 used by tools like the Rust Language Service to perform
5735 metadata-only builds.
5736 * [Levenshtein based typo suggestions now work in most places, while
5737 previously they worked only for fields and sometimes for local
5738 variables][38927]. Together with the overhaul of "no
5739 resolution"/"unexpected resolution" errors (#[38154]) they result in
5740 large and systematic improvement in resolution diagnostics.
5741 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5743 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5744 * [`rustc` no longer attempts to provide "consider using an explicit
5745 lifetime" suggestions][37057]. They were inaccurate.
5750 * [`VecDeque::truncate`]
5751 * [`VecDeque::resize`]
5752 * [`String::insert_str`]
5753 * [`Duration::checked_add`]
5754 * [`Duration::checked_sub`]
5755 * [`Duration::checked_div`]
5756 * [`Duration::checked_mul`]
5759 * [`SocketAddr::is_ipv4`]
5760 * [`SocketAddr::is_ipv6`]
5761 * [`IpAddr::is_ipv4`]
5762 * [`IpAddr::is_ipv6`]
5764 * [`Vec::dedup_by_key`]
5765 * [`Result::unwrap_or_default`]
5766 * [`<*const T>::wrapping_offset`]
5767 * [`<*mut T>::wrapping_offset`]
5768 * `CommandExt::creation_flags`
5769 * [`File::set_permissions`]
5770 * [`String::split_off`]
5775 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5776 their argument by `Borrow` parameter][37761]
5777 * [All public types in std implement `Debug`][38006]
5778 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5779 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5780 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5782 * [std: Fix partial writes in `LineWriter`][38062]
5783 * [std: Clamp max read/write sizes on Unix][38062]
5784 * [Use more specific panic message for `&str` slicing errors][38066]
5785 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5786 functionality cannot be achieved in std currently.
5787 * [`writeln!`, like `println!`, now accepts a form with no string
5788 or formatting arguments, to just print a newline][38469]
5789 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5790 * [Reduce the size of static data in `std_unicode::tables`][38781]
5791 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5792 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5794 * [`Duration` implements `Sum`][38712]
5795 * [`String` implements `ToSocketAddrs`][39048]
5800 * [The `cargo check` command does a type check of a project without
5801 building it][cargo/3296]
5802 * [crates.io will display CI badges from Travis and AppVeyor, if
5803 specified in Cargo.toml][cargo/3546]
5804 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5805 * [Compilation profiles accept integer values for `debug`, in addition
5806 to `true` and `false`. These are passed to `rustc` as the value to
5807 `-C debuginfo`][cargo/3534]
5808 * [Implement `cargo --version --verbose`][cargo/3604]
5809 * [All builds now output 'dep-info' build dependencies compatible with
5810 make and ninja][cargo/3557]
5811 * [Build all workspace members with `build --all`][cargo/3511]
5812 * [Document all workspace members with `doc --all`][cargo/3515]
5813 * [Path deps outside workspace are not members][cargo/3443]
5818 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5819 the path to the Rust implementation][38589]
5820 * [The `armv7-linux-androideabi` target no longer enables NEON
5821 extensions, per Google's ABI guide][38413]
5822 * [The stock standard library can be compiled for Redox OS][38401]
5823 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5825 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5827 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5832 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5833 match patterns][38069]
5834 * In this release, references to uninhabited types can not be
5835 pattern-matched. This was accidentally allowed in 1.15.
5836 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5837 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5839 * [Clean up semantics of `self` in an import list][38313]
5840 * Reimplemented lifetime elision. This change was almost entirely compatible
5841 with existing code, but it did close a number of small bugs and loopholes,
5842 as well as being more accepting in some other [cases][41105].
5844 [37057]: https://github.com/rust-lang/rust/pull/37057
5845 [37761]: https://github.com/rust-lang/rust/pull/37761
5846 [38006]: https://github.com/rust-lang/rust/pull/38006
5847 [38051]: https://github.com/rust-lang/rust/pull/38051
5848 [38062]: https://github.com/rust-lang/rust/pull/38062
5849 [38062]: https://github.com/rust-lang/rust/pull/38622
5850 [38066]: https://github.com/rust-lang/rust/pull/38066
5851 [38069]: https://github.com/rust-lang/rust/pull/38069
5852 [38131]: https://github.com/rust-lang/rust/pull/38131
5853 [38154]: https://github.com/rust-lang/rust/pull/38154
5854 [38274]: https://github.com/rust-lang/rust/pull/38274
5855 [38304]: https://github.com/rust-lang/rust/pull/38304
5856 [38313]: https://github.com/rust-lang/rust/pull/38313
5857 [38314]: https://github.com/rust-lang/rust/pull/38314
5858 [38327]: https://github.com/rust-lang/rust/pull/38327
5859 [38401]: https://github.com/rust-lang/rust/pull/38401
5860 [38413]: https://github.com/rust-lang/rust/pull/38413
5861 [38469]: https://github.com/rust-lang/rust/pull/38469
5862 [38559]: https://github.com/rust-lang/rust/pull/38559
5863 [38571]: https://github.com/rust-lang/rust/pull/38571
5864 [38580]: https://github.com/rust-lang/rust/pull/38580
5865 [38589]: https://github.com/rust-lang/rust/pull/38589
5866 [38670]: https://github.com/rust-lang/rust/pull/38670
5867 [38712]: https://github.com/rust-lang/rust/pull/38712
5868 [38726]: https://github.com/rust-lang/rust/pull/38726
5869 [38781]: https://github.com/rust-lang/rust/pull/38781
5870 [38798]: https://github.com/rust-lang/rust/pull/38798
5871 [38909]: https://github.com/rust-lang/rust/pull/38909
5872 [38920]: https://github.com/rust-lang/rust/pull/38920
5873 [38927]: https://github.com/rust-lang/rust/pull/38927
5874 [39048]: https://github.com/rust-lang/rust/pull/39048
5875 [39282]: https://github.com/rust-lang/rust/pull/39282
5876 [39379]: https://github.com/rust-lang/rust/pull/39379
5877 [41105]: https://github.com/rust-lang/rust/issues/41105
5878 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5879 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5880 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5881 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5882 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5883 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5884 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5885 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5886 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5887 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5888 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5889 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5890 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5891 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5892 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5893 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5894 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5895 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5896 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5897 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5898 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5899 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5900 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5901 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5902 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5903 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5904 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5905 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5906 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5907 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5910 Version 1.15.1 (2017-02-09)
5911 ===========================
5913 * [Fix IntoIter::as_mut_slice's signature][39466]
5914 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5916 [39466]: https://github.com/rust-lang/rust/pull/39466
5917 [39523]: https://github.com/rust-lang/rust/pull/39523
5920 Version 1.15.0 (2017-02-02)
5921 ===========================
5926 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5927 stable. This allows popular code-generating crates like Serde and Diesel to
5928 work ergonomically. [RFC 1681].
5929 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5930 with curly braces][36868]. Part of [RFC 1506].
5931 * [A number of minor changes to name resolution have been activated][37127].
5932 They add up to more consistent semantics, allowing for future evolution of
5933 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5934 details of what is different. The breaking changes here have been transitioned
5935 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5936 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5938 * [`?Sized` can be used in `where` clauses][37791]
5939 * [There is now a limit on the size of monomorphized types and it can be
5940 modified with the `#![type_size_limit]` crate attribute, similarly to
5941 the `#![recursion_limit]` attribute][37789]
5946 * [On Windows, the compiler will apply dllimport attributes when linking to
5947 extern functions][37973]. Additional attributes and flags can control which
5948 library kind is linked and its name. [RFC 1717].
5949 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5950 * [The `--test` flag works with procedural macro crates][38107]
5951 * [Fix `extern "aapcs" fn` ABI][37814]
5952 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5953 * [The `format!` expander recognizes incorrect `printf` and shell-style
5954 formatting directives and suggests the correct format][37613].
5955 * [Only report one error for all unused imports in an import list][37456]
5957 Compiler Performance
5958 --------------------
5960 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5961 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5962 * [Don't clone in `UnificationTable::probe`][37848]
5963 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5964 * [Use small vectors in type walker][37760]
5965 * [Macro expansion performance was improved][37701]
5966 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5967 * [Replace FNV with a faster hash function][37229]
5972 * [`std::iter::Iterator::min_by`]
5973 * [`std::iter::Iterator::max_by`]
5974 * [`std::os::*::fs::FileExt`]
5975 * [`std::sync::atomic::Atomic*::get_mut`]
5976 * [`std::sync::atomic::Atomic*::into_inner`]
5977 * [`std::vec::IntoIter::as_slice`]
5978 * [`std::vec::IntoIter::as_mut_slice`]
5979 * [`std::sync::mpsc::Receiver::try_iter`]
5980 * [`std::os::unix::process::CommandExt::before_exec`]
5981 * [`std::rc::Rc::strong_count`]
5982 * [`std::rc::Rc::weak_count`]
5983 * [`std::sync::Arc::strong_count`]
5984 * [`std::sync::Arc::weak_count`]
5985 * [`std::char::encode_utf8`]
5986 * [`std::char::encode_utf16`]
5987 * [`std::cell::Ref::clone`]
5988 * [`std::io::Take::into_inner`]
5993 * [The standard sorting algorithm has been rewritten for dramatic performance
5994 improvements][38192]. It is a hybrid merge sort, drawing influences from
5995 Timsort. Previously it was a naive merge sort.
5996 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5997 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5999 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6000 and `char_indices().last()`][37882]
6001 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6002 * [Chinese characters display correctly in `fmt::Debug`][37855]
6003 * [Derive `Default` for `Duration`][37699]
6004 * [Support creation of anonymous pipes on WinXP/2k][37677]
6005 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6006 * [Don't pass overlapped handles to processes][38835]
6011 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6012 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6013 should instead check the variable at runtime with `std::env`. That the value
6014 was set at build time was a bug, and incorrect when cross-compiling. This
6015 change is known to cause breakage.
6016 * [Add `--all` flag to `cargo test`][cargo/3221]
6017 * [Compile statically against the MSVC CRT][cargo/3363]
6018 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6019 * [Link OpenSSL statically on OSX][cargo/3311]
6020 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6021 * [Test for bad path overrides with summaries][cargo/3336]
6022 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6023 * [Fix retrying crate downloads for network errors][cargo/3348]
6024 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6025 * [Emit more info on --message-format=json][cargo/3319]
6026 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6027 * [Don't ignore errors in workspace manifest][cargo/3409]
6028 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6033 * [Test runners (binaries built with `--test`) now support a `--list` argument
6034 that lists the tests it contains][38185]
6035 * [Test runners now support a `--exact` argument that makes the test filter
6036 match exactly, instead of matching only a substring of the test name][38181]
6037 * [rustdoc supports a `--playground-url` flag][37763]
6038 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6043 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6044 continue to be used in this release by passing `--disable-rustbuild` to the
6045 configure script, but they will be deleted soon. Note that the new build
6046 system uses a different on-disk layout that will likely affect any scripts
6048 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6050 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6051 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6057 * [A number of minor changes to name resolution have been activated][37127].
6058 They add up to more consistent semantics, allowing for future evolution of
6059 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6060 details of what is different. The breaking changes here have been transitioned
6061 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6062 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6063 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6064 should instead check the variable at runtime with `std::env`. That the value
6065 was set at build time was a bug, and incorrect when cross-compiling. This
6066 change is known to cause breakage.
6067 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6068 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6069 1.10 and is now an error by default. It will become a hard error in the near
6071 * [The semantics relating modules to file system directories are changing in
6072 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6073 lint, which is a warning in this release, and will become a hard error in the
6075 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6076 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6077 the underlying iterator][37834]
6079 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6080 [33685]: https://github.com/rust-lang/rust/issues/33685
6081 [36868]: https://github.com/rust-lang/rust/pull/36868
6082 [37127]: https://github.com/rust-lang/rust/pull/37127
6083 [37229]: https://github.com/rust-lang/rust/pull/37229
6084 [37456]: https://github.com/rust-lang/rust/pull/37456
6085 [37527]: https://github.com/rust-lang/rust/pull/37527
6086 [37602]: https://github.com/rust-lang/rust/pull/37602
6087 [37613]: https://github.com/rust-lang/rust/pull/37613
6088 [37615]: https://github.com/rust-lang/rust/pull/37615
6089 [37636]: https://github.com/rust-lang/rust/pull/37636
6090 [37627]: https://github.com/rust-lang/rust/pull/37627
6091 [37642]: https://github.com/rust-lang/rust/pull/37642
6092 [37677]: https://github.com/rust-lang/rust/pull/37677
6093 [37699]: https://github.com/rust-lang/rust/pull/37699
6094 [37701]: https://github.com/rust-lang/rust/pull/37701
6095 [37705]: https://github.com/rust-lang/rust/pull/37705
6096 [37749]: https://github.com/rust-lang/rust/pull/37749
6097 [37760]: https://github.com/rust-lang/rust/pull/37760
6098 [37763]: https://github.com/rust-lang/rust/pull/37763
6099 [37764]: https://github.com/rust-lang/rust/pull/37764
6100 [37789]: https://github.com/rust-lang/rust/pull/37789
6101 [37791]: https://github.com/rust-lang/rust/pull/37791
6102 [37814]: https://github.com/rust-lang/rust/pull/37814
6103 [37817]: https://github.com/rust-lang/rust/pull/37817
6104 [37834]: https://github.com/rust-lang/rust/pull/37834
6105 [37848]: https://github.com/rust-lang/rust/pull/37848
6106 [37855]: https://github.com/rust-lang/rust/pull/37855
6107 [37882]: https://github.com/rust-lang/rust/pull/37882
6108 [37888]: https://github.com/rust-lang/rust/pull/37888
6109 [37973]: https://github.com/rust-lang/rust/pull/37973
6110 [37979]: https://github.com/rust-lang/rust/pull/37979
6111 [38086]: https://github.com/rust-lang/rust/pull/38086
6112 [38107]: https://github.com/rust-lang/rust/pull/38107
6113 [38117]: https://github.com/rust-lang/rust/pull/38117
6114 [38134]: https://github.com/rust-lang/rust/pull/38134
6115 [38146]: https://github.com/rust-lang/rust/pull/38146
6116 [38181]: https://github.com/rust-lang/rust/pull/38181
6117 [38182]: https://github.com/rust-lang/rust/pull/38182
6118 [38185]: https://github.com/rust-lang/rust/pull/38185
6119 [38192]: https://github.com/rust-lang/rust/pull/38192
6120 [38279]: https://github.com/rust-lang/rust/pull/38279
6121 [38835]: https://github.com/rust-lang/rust/pull/38835
6122 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6123 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6124 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6125 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6126 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6127 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6128 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6129 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6130 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6131 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6132 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6133 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6134 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6135 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6136 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6137 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6138 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6139 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6140 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6141 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6142 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6143 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6144 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6145 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6146 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6147 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6148 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6149 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6150 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6151 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6152 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6153 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6154 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6155 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6156 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6157 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6158 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6159 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6162 Version 1.14.0 (2016-12-22)
6163 ===========================
6168 * [`..` matches multiple tuple fields in enum variants, structs
6169 and tuples][36843]. [RFC 1492].
6170 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6171 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6172 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6173 dereferencing][36822]
6178 * [Mark enums with non-zero discriminant as non-zero][37224]
6179 * [Lower-case `static mut` names are linted like other
6180 statics and consts][37162]
6181 * [Fix ICE on some macros in const integer positions
6182 (e.g. `[u8; m!()]`)][36819]
6183 * [Improve error message and snippet for "did you mean `x`"][36798]
6184 * [Add a panic-strategy field to the target specification][36794]
6185 * [Include LLVM version in `--version --verbose`][37200]
6187 Compile-time Optimizations
6188 --------------------------
6190 * [Improve macro expansion performance][37569]
6191 * [Shrink `Expr_::ExprInlineAsm`][37445]
6192 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6193 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6194 * [Avoid more allocations when compiling html5ever][37373]
6195 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6196 * [Avoid some allocations in the macro parser][37318]
6197 * [Use a faster deflate setting][37298]
6198 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6199 during interning of slices][37270]
6200 * [Optimize `write_metadata`][37267]
6201 * [Don't process obligation forest cycles when stalled][37231]
6202 * [Avoid many `CrateConfig` clones][37161]
6203 * [Optimize `Substs::super_fold_with`][37108]
6204 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6205 * [Speed up `plug_leaks`][36917]
6210 * [`println!()`, with no arguments, prints newline][36825].
6211 Previously, an empty string was required to achieve the same.
6212 * [`Wrapping` impls standard binary and unary operators, as well as
6213 the `Sum` and `Product` iterators][37356]
6214 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6216 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6217 `VecDeque` iterators][37315]
6218 * [Improve `SipHasher` performance on small values][37312]
6219 * [Add Iterator trait TrustedLen to enable better FromIterator /
6221 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6222 * [`ReadDir` implements `Debug`][37221]
6223 * [Implement `RefUnwindSafe` for atomic types][37178]
6224 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6225 * [Avoid allocations in `Decoder::read_str`][37064]
6226 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6227 * [Impl `Debug` for raw pointers to unsized data][36880]
6228 * [Don't reuse `HashMap` random seeds][37470]
6229 * [The internal memory layout of `HashMap` is more cache-friendly, for
6230 significant improvements in some operations][36692]
6231 * [`HashMap` uses less memory on 32-bit architectures][36595]
6232 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6237 * [Expose rustc cfg values to build scripts][cargo/3243]
6238 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6239 * [Fix passing --features when testing multiple packages][cargo/3280]
6240 * [Use a single profile set per workspace][cargo/3249]
6241 * [Load `replace` sections from lock files][cargo/3220]
6242 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6247 * [rustup is the recommended Rust installation method][1.14rustup]
6248 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6249 S390x. These are [tier 2] platforms and may have major defects. Follow the
6250 instructions on the website to install, or add the targets to an existing
6251 installation with `rustup target add`. The new target triples are:
6252 - `mips-unknown-linux-gnu`
6253 - `mipsel-unknown-linux-gnu`
6254 - `mips64-unknown-linux-gnuabi64`
6255 - `mips64el-unknown-linux-gnuabi64 `
6256 - `powerpc-unknown-linux-gnu`
6257 - `powerpc64-unknown-linux-gnu`
6258 - `powerpc64le-unknown-linux-gnu`
6259 - `s390x-unknown-linux-gnu `
6260 * This release includes target (std) builds for ARM Linux running MUSL
6261 libc. These are [tier 2] platforms and may have major defects. Add the
6262 following triples to an existing rustup installation with `rustup target add`:
6263 - `arm-unknown-linux-musleabi`
6264 - `arm-unknown-linux-musleabihf`
6265 - `armv7-unknown-linux-musleabihf`
6266 * This release includes [experimental support for WebAssembly][1.14wasm], via
6267 the `wasm32-unknown-emscripten` target. This target is known to have major
6268 defects. Please test, report, and fix.
6269 * rustup no longer installs documentation by default. Run `rustup
6270 component add rust-docs` to install.
6271 * [Fix line stepping in debugger][37310]
6272 * [Enable line number debuginfo in releases][37280]
6277 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6278 * [Add support for Fuchsia OS][37313]
6279 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6284 * [A number of forward-compatibility lints used by the compiler
6285 to gradually introduce language changes have been converted
6286 to deny by default][36894]:
6287 - ["use of inaccessible extern crate erroneously allowed"][36886]
6288 - ["type parameter default erroneously allowed in invalid location"][36887]
6289 - ["detects super or self keywords at the beginning of global path"][36888]
6290 - ["two overlapping inherent impls define an item with the same name
6291 were erroneously allowed"][36889]
6292 - ["floating-point constants cannot be used in patterns"][36890]
6293 - ["constants of struct or enum type can only be used in a pattern if
6294 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6295 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6296 * [Prohibit patterns in trait methods without bodies][37378]
6297 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6298 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6299 * [The `$crate` macro variable is accepted in fewer locations][37213]
6300 * [Impls specifying extra region requirements beyond the trait
6301 they implement are rejected][37167]
6302 * [Enums may not be unsized][37111]. Unsized enums are intended to
6303 work but never have. For now they are forbidden.
6304 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6306 [tier 2]: https://forge.rust-lang.org/platform-support.html
6307 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6308 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6309 [36430]: https://github.com/rust-lang/rust/pull/36430
6310 [36595]: https://github.com/rust-lang/rust/pull/36595
6311 [36595]: https://github.com/rust-lang/rust/pull/36595
6312 [36692]: https://github.com/rust-lang/rust/pull/36692
6313 [36767]: https://github.com/rust-lang/rust/pull/36767
6314 [36794]: https://github.com/rust-lang/rust/pull/36794
6315 [36798]: https://github.com/rust-lang/rust/pull/36798
6316 [36819]: https://github.com/rust-lang/rust/pull/36819
6317 [36822]: https://github.com/rust-lang/rust/pull/36822
6318 [36825]: https://github.com/rust-lang/rust/pull/36825
6319 [36843]: https://github.com/rust-lang/rust/pull/36843
6320 [36880]: https://github.com/rust-lang/rust/pull/36880
6321 [36886]: https://github.com/rust-lang/rust/issues/36886
6322 [36887]: https://github.com/rust-lang/rust/issues/36887
6323 [36888]: https://github.com/rust-lang/rust/issues/36888
6324 [36889]: https://github.com/rust-lang/rust/issues/36889
6325 [36890]: https://github.com/rust-lang/rust/issues/36890
6326 [36891]: https://github.com/rust-lang/rust/issues/36891
6327 [36892]: https://github.com/rust-lang/rust/issues/36892
6328 [36894]: https://github.com/rust-lang/rust/pull/36894
6329 [36917]: https://github.com/rust-lang/rust/pull/36917
6330 [36993]: https://github.com/rust-lang/rust/pull/36993
6331 [37037]: https://github.com/rust-lang/rust/pull/37037
6332 [37064]: https://github.com/rust-lang/rust/pull/37064
6333 [37094]: https://github.com/rust-lang/rust/pull/37094
6334 [37108]: https://github.com/rust-lang/rust/pull/37108
6335 [37111]: https://github.com/rust-lang/rust/pull/37111
6336 [37161]: https://github.com/rust-lang/rust/pull/37161
6337 [37162]: https://github.com/rust-lang/rust/pull/37162
6338 [37167]: https://github.com/rust-lang/rust/pull/37167
6339 [37178]: https://github.com/rust-lang/rust/pull/37178
6340 [37200]: https://github.com/rust-lang/rust/pull/37200
6341 [37213]: https://github.com/rust-lang/rust/pull/37213
6342 [37221]: https://github.com/rust-lang/rust/pull/37221
6343 [37224]: https://github.com/rust-lang/rust/pull/37224
6344 [37230]: https://github.com/rust-lang/rust/pull/37230
6345 [37231]: https://github.com/rust-lang/rust/pull/37231
6346 [37247]: https://github.com/rust-lang/rust/pull/37247
6347 [37267]: https://github.com/rust-lang/rust/pull/37267
6348 [37270]: https://github.com/rust-lang/rust/pull/37270
6349 [37273]: https://github.com/rust-lang/rust/pull/37273
6350 [37280]: https://github.com/rust-lang/rust/pull/37280
6351 [37298]: https://github.com/rust-lang/rust/pull/37298
6352 [37306]: https://github.com/rust-lang/rust/pull/37306
6353 [37310]: https://github.com/rust-lang/rust/pull/37310
6354 [37312]: https://github.com/rust-lang/rust/pull/37312
6355 [37313]: https://github.com/rust-lang/rust/pull/37313
6356 [37315]: https://github.com/rust-lang/rust/pull/37315
6357 [37318]: https://github.com/rust-lang/rust/pull/37318
6358 [37322]: https://github.com/rust-lang/rust/pull/37322
6359 [37326]: https://github.com/rust-lang/rust/pull/37326
6360 [37351]: https://github.com/rust-lang/rust/pull/37351
6361 [37356]: https://github.com/rust-lang/rust/pull/37356
6362 [37367]: https://github.com/rust-lang/rust/pull/37367
6363 [37373]: https://github.com/rust-lang/rust/pull/37373
6364 [37378]: https://github.com/rust-lang/rust/pull/37378
6365 [37389]: https://github.com/rust-lang/rust/pull/37389
6366 [37392]: https://github.com/rust-lang/rust/pull/37392
6367 [37427]: https://github.com/rust-lang/rust/pull/37427
6368 [37439]: https://github.com/rust-lang/rust/pull/37439
6369 [37445]: https://github.com/rust-lang/rust/pull/37445
6370 [37470]: https://github.com/rust-lang/rust/pull/37470
6371 [37569]: https://github.com/rust-lang/rust/pull/37569
6372 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6373 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6374 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6375 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6376 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6377 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6378 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6381 Version 1.13.0 (2016-11-10)
6382 ===========================
6387 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6388 errors, like the `try!` macro, described in [RFC 0243].
6389 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6390 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6391 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6392 * [Fix lifetime rules for 'if' conditions][36029]
6393 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6398 * [Add the `-C link-arg` argument][36574]
6399 * [Remove the old AST-based backend from rustc_trans][35764]
6400 * [Don't enable NEON by default on armv7 Linux][35814]
6401 * [Fix debug line number info for macro expansions][35238]
6402 * [Do not emit "class method" debuginfo for types that are not
6403 DICompositeType][36008]
6404 * [Warn about multiple conflicting #[repr] hints][34623]
6405 * [When sizing DST, don't double-count nested struct prefixes][36351]
6406 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6407 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6408 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6409 * [Expand macros without recursing to avoid stack overflows][36214]
6414 * [Replace macro backtraces with labeled local uses][35702]
6415 * [Improve error message for misplaced doc comments][33922]
6416 * [Buffer unix and lock windows to prevent message interleaving][35975]
6417 * [Update lifetime errors to specifically note temporaries][36171]
6418 * [Special case a few colors for Windows][36178]
6419 * [Suggest `use self` when such an import resolves][36289]
6420 * [Be more specific when type parameter shadows primitive type][36338]
6421 * Many minor improvements
6423 Compile-time Optimizations
6424 --------------------------
6426 * [Compute and cache HIR hashes at beginning][35854]
6427 * [Don't hash types in loan paths][36004]
6428 * [Cache projections in trans][35761]
6429 * [Optimize the parser's last token handling][36527]
6430 * [Only instantiate #[inline] functions in codegen units referencing
6431 them][36524]. This leads to big improvements in cases where crates export
6432 define many inline functions without using them directly.
6433 * [Lazily allocate TypedArena's first chunk][36592]
6434 * [Don't allocate during default HashSet creation][36734]
6441 * [`overflowing_abs`]
6442 * [`RefCell::try_borrow`]
6443 * [`RefCell::try_borrow_mut`]
6448 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6449 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6451 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6452 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6453 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6454 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6455 * [Use arc4rand on FreeBSD][35884]
6456 * [memrchr: Correct aligned offset computation][35969]
6457 * [Improve Demangling of Rust Symbols][36059]
6458 * [Use monotonic time in condition variables][35048]
6459 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6460 * [Implement conversion traits for `char`][35755]
6461 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6462 * [Zero first byte of CString on drop][36264]
6463 * [Inherit overflow checks for sum and product][36372]
6464 * [Add missing Eq implementations][36423]
6465 * [Implement `Debug` for `DirEntry`][36631]
6466 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6468 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6469 * [Implement more traits for `std::io::ErrorKind`][35911]
6470 * [Optimize BinaryHeap bounds checking][36072]
6471 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6472 `extend_with_element`][36355]
6473 * [Fix overflow checking in unsigned pow()][34942]
6478 * This release includes security fixes to both curl and OpenSSL.
6479 * [Fix transitive doctests when panic=abort][cargo/3021]
6480 * [Add --all-features flag to cargo][cargo/3038]
6481 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6482 * [Don't parse the home directory more than once][cargo/3078]
6483 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6484 * [Update OpenSSL to 1.0.2j][cargo/3121]
6485 * [Add license and license_file to cargo metadata output][cargo/3110]
6486 * [Make crates-io registry URL optional in config; ignore all changes to
6487 source.crates-io][cargo/3089]
6488 * [Don't download dependencies from other platforms][cargo/3123]
6489 * [Build transitive dev-dependencies when needed][cargo/3125]
6490 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6491 * [Avoid updating registry when adding existing deps][cargo/3144]
6492 * [Warn about path overrides that won't work][cargo/3136]
6493 * [Use workspaces during `cargo install`][cargo/3146]
6494 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6495 * [Add --message-format flag][cargo/3000]
6496 * [Pass target environment for rustdoc][cargo/3205]
6497 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6498 * [Update curl and curl-sys][cargo/3241]
6499 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6504 * [rustdoc: Add the `--sysroot` argument][36586]
6505 * [rustdoc: Fix a couple of issues with the search results][35655]
6506 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6507 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6508 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6513 * [Remove unmaintained style guide][35124]
6514 * [Add s390x support][36369]
6515 * [Initial work at Haiku OS support][36727]
6516 * [Add mips-uclibc targets][35734]
6517 * [Crate-ify compiler-rt into compiler-builtins][35021]
6518 * [Add rustc version info (git hash + date) to dist tarball][36213]
6519 * Many documentation improvements
6524 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6525 * [Deny (by default) transmuting from fn item types to pointer-sized
6526 types][34923]. Continuing the long transition to zero-sized fn items,
6528 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6530 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6531 * [Fix lifetime rules for 'if' conditions][36029].
6532 * [Inherit overflow checks for sum and product][36372].
6533 * [Forbid user-defined macros named "macro_rules"][36730].
6535 [33922]: https://github.com/rust-lang/rust/pull/33922
6536 [34623]: https://github.com/rust-lang/rust/pull/34623
6537 [34923]: https://github.com/rust-lang/rust/pull/34923
6538 [34942]: https://github.com/rust-lang/rust/pull/34942
6539 [34982]: https://github.com/rust-lang/rust/pull/34982
6540 [35021]: https://github.com/rust-lang/rust/pull/35021
6541 [35048]: https://github.com/rust-lang/rust/pull/35048
6542 [35074]: https://github.com/rust-lang/rust/pull/35074
6543 [35124]: https://github.com/rust-lang/rust/pull/35124
6544 [35234]: https://github.com/rust-lang/rust/pull/35234
6545 [35238]: https://github.com/rust-lang/rust/pull/35238
6546 [35354]: https://github.com/rust-lang/rust/pull/35354
6547 [35559]: https://github.com/rust-lang/rust/pull/35559
6548 [35585]: https://github.com/rust-lang/rust/pull/35585
6549 [35627]: https://github.com/rust-lang/rust/pull/35627
6550 [35655]: https://github.com/rust-lang/rust/pull/35655
6551 [35702]: https://github.com/rust-lang/rust/pull/35702
6552 [35707]: https://github.com/rust-lang/rust/pull/35707
6553 [35728]: https://github.com/rust-lang/rust/pull/35728
6554 [35734]: https://github.com/rust-lang/rust/pull/35734
6555 [35755]: https://github.com/rust-lang/rust/pull/35755
6556 [35761]: https://github.com/rust-lang/rust/pull/35761
6557 [35764]: https://github.com/rust-lang/rust/pull/35764
6558 [35814]: https://github.com/rust-lang/rust/pull/35814
6559 [35854]: https://github.com/rust-lang/rust/pull/35854
6560 [35871]: https://github.com/rust-lang/rust/pull/35871
6561 [35884]: https://github.com/rust-lang/rust/pull/35884
6562 [35911]: https://github.com/rust-lang/rust/pull/35911
6563 [35969]: https://github.com/rust-lang/rust/pull/35969
6564 [35975]: https://github.com/rust-lang/rust/pull/35975
6565 [36004]: https://github.com/rust-lang/rust/pull/36004
6566 [36008]: https://github.com/rust-lang/rust/pull/36008
6567 [36014]: https://github.com/rust-lang/rust/pull/36014
6568 [36029]: https://github.com/rust-lang/rust/pull/36029
6569 [36059]: https://github.com/rust-lang/rust/pull/36059
6570 [36072]: https://github.com/rust-lang/rust/pull/36072
6571 [36101]: https://github.com/rust-lang/rust/pull/36101
6572 [36104]: https://github.com/rust-lang/rust/pull/36104
6573 [36171]: https://github.com/rust-lang/rust/pull/36171
6574 [36173]: https://github.com/rust-lang/rust/pull/36173
6575 [36178]: https://github.com/rust-lang/rust/pull/36178
6576 [36213]: https://github.com/rust-lang/rust/pull/36213
6577 [36214]: https://github.com/rust-lang/rust/pull/36214
6578 [36264]: https://github.com/rust-lang/rust/pull/36264
6579 [36266]: https://github.com/rust-lang/rust/pull/36266
6580 [36289]: https://github.com/rust-lang/rust/pull/36289
6581 [36338]: https://github.com/rust-lang/rust/pull/36338
6582 [36351]: https://github.com/rust-lang/rust/pull/36351
6583 [36355]: https://github.com/rust-lang/rust/pull/36355
6584 [36369]: https://github.com/rust-lang/rust/pull/36369
6585 [36372]: https://github.com/rust-lang/rust/pull/36372
6586 [36423]: https://github.com/rust-lang/rust/pull/36423
6587 [36482]: https://github.com/rust-lang/rust/pull/36482
6588 [36505]: https://github.com/rust-lang/rust/pull/36505
6589 [36524]: https://github.com/rust-lang/rust/pull/36524
6590 [36527]: https://github.com/rust-lang/rust/pull/36527
6591 [36551]: https://github.com/rust-lang/rust/pull/36551
6592 [36574]: https://github.com/rust-lang/rust/pull/36574
6593 [36586]: https://github.com/rust-lang/rust/pull/36586
6594 [36592]: https://github.com/rust-lang/rust/pull/36592
6595 [36631]: https://github.com/rust-lang/rust/pull/36631
6596 [36639]: https://github.com/rust-lang/rust/pull/36639
6597 [36721]: https://github.com/rust-lang/rust/pull/36721
6598 [36727]: https://github.com/rust-lang/rust/pull/36727
6599 [36730]: https://github.com/rust-lang/rust/pull/36730
6600 [36734]: https://github.com/rust-lang/rust/pull/36734
6601 [36754]: https://github.com/rust-lang/rust/pull/36754
6602 [36995]: https://github.com/rust-lang/rust/pull/36995
6603 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6604 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6605 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6606 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6607 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6608 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6609 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6610 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6611 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6612 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6613 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6614 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6615 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6616 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6617 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6618 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6619 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6620 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6621 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6622 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6623 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6624 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6625 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6626 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6627 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6628 [rustup]: https://www.rustup.rs
6629 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6630 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6631 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6632 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6633 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6634 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6635 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6638 Version 1.12.1 (2016-10-20)
6639 ===========================
6644 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6645 * [Confusion with double negation and booleans][36856]
6646 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6647 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6648 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6649 * [Corrupted memory after updated to 1.12][36936]
6650 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6651 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6652 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6654 [36381]: https://github.com/rust-lang/rust/issues/36381
6655 [36856]: https://github.com/rust-lang/rust/issues/36856
6656 [36875]: https://github.com/rust-lang/rust/issues/36875
6657 [36924]: https://github.com/rust-lang/rust/issues/36924
6658 [36926]: https://github.com/rust-lang/rust/issues/36926
6659 [36936]: https://github.com/rust-lang/rust/issues/36936
6660 [37026]: https://github.com/rust-lang/rust/issues/37026
6661 [37112]: https://github.com/rust-lang/rust/issues/37112
6662 [37153]: https://github.com/rust-lang/rust/issues/37153
6665 Version 1.12.0 (2016-09-29)
6666 ===========================
6671 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6672 This translation pass is far simpler than the previous AST->LLVM pass, and
6673 creates opportunities to perform new optimizations directly on the MIR. It
6674 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6675 * [`rustc` presents a new, more readable error format, along with
6676 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6677 Most common editors supporting Rust have been updated to work with it. It was
6678 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6683 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6684 This translation pass is far simpler than the previous AST->LLVM pass, and
6685 creates opportunities to perform new optimizations directly on the MIR. It
6686 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6687 * [Print the Rust target name, not the LLVM target name, with
6688 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6689 * [The computation of `TypeId` is correct in some cases where it was previously
6690 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6691 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6692 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6693 `--print relocation-models`, and `--print code-models` print the available
6694 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6695 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6696 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6697 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6698 These targets produce statically-linked binaries. There are no binary release
6704 * [`rustc` presents a new, more readable error format, along with
6705 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6706 Most common editors supporting Rust have been updated to work with it. It was
6707 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6708 * [In error descriptions, references are now described in plain English,
6709 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6710 * [In error type descriptions, unknown numeric types are named `{integer}` or
6711 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6712 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6717 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6718 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6719 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6720 useful](https://github.com/rust-lang/rust/pull/34908)
6721 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6722 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6723 * [Semicolons are properly required as statement delimiters inside
6724 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6725 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6730 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6731 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6732 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6733 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6734 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6735 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6736 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6737 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6738 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6739 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6740 Both on Unix and Windows.
6741 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6742 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6743 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6744 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6745 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6746 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6747 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6748 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6753 * [The `format!` macro and friends now allow a single argument to be formatted
6754 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6755 * [The lifetime bounds on `[T]::binary_search_by` and
6756 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6757 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6758 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6759 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6760 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6761 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6762 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6763 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6764 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6765 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6766 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6767 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6768 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6769 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6770 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6771 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6772 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6773 * [`mpsc::sync_channel` `Receiver`s return any available message before
6774 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6775 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6776 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6781 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6782 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6783 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6784 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6785 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6786 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6787 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6788 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6789 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6790 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6791 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6792 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6793 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6794 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6795 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6796 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6801 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6802 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6807 * [Test binaries now support a `--test-threads` argument to specify the number
6808 of threads used to run tests, and which acts the same as the
6809 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6810 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6811 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6812 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6813 * [Rust releases now come with source packages that can be installed by rustup
6814 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6815 The resulting source code can be used by tools and IDES, located in the
6816 sysroot under `lib/rustlib/src`.
6821 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6822 * Many minor improvements to the documentation.
6823 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6828 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6829 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6830 * [When formatting strings, if "precision" is specified, the "fill",
6831 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6832 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6835 Version 1.11.0 (2016-08-18)
6836 ===========================
6841 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6842 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6843 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6844 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6849 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6850 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6851 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6852 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6853 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6854 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6855 (in libcore - previously stabilized in libstd)
6856 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6857 (in libcore - previously stabilized in libstd)
6858 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6859 (in libcore - previously stabilized in libstd)
6860 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6861 (in libcore - previously stabilized in libstd)
6862 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6863 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6864 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6865 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6870 * [The `thread_local!` macro supports multiple definitions in a single
6871 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6872 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6873 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6874 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6875 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6876 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6877 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6878 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6883 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6884 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6885 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6886 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6887 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6888 and `-vv` prints warnings for all crates.
6889 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6890 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6891 This provides room for expansion by arbitrary tools.
6892 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6893 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6894 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6895 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6896 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6897 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6898 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6903 * [Caching projections speeds up type check dramatically for some
6904 workloads](https://github.com/rust-lang/rust/pull/33816)
6905 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6906 This hasher is faster, but is believed to provide sufficient
6907 protection from collision attacks.
6908 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6913 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6914 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6915 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6916 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6917 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6922 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6923 * [When emitting debug info, rustc emits frame pointers for closures,
6924 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6925 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6926 * Many more errors have been given error codes and extended
6928 * API documentation continues to be improved, with many new examples
6933 * [rustc no longer hangs when dependencies recursively re-export
6934 submodules](https://github.com/rust-lang/rust/pull/34542)
6935 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6936 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6937 rewritten](https://github.com/rust-lang/rust/pull/33895)
6938 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6939 No targets use this yet, but it works toward AVR support.
6944 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6945 * [The new follow-set rules that place restrictions on `macro_rules!`
6946 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6947 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6948 and has been a warning since 1.10.
6949 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6950 This causes breakage in some corner cases.
6953 Version 1.10.0 (2016-07-07)
6954 ===========================
6959 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6960 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6961 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6962 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6963 * [`panic!` can be converted to a runtime abort with the
6964 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6965 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6966 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6967 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6968 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6969 Note that Cargo does not yet directly support cdylibs.
6974 * `os::windows::fs::OpenOptionsExt::access_mode`
6975 * `os::windows::fs::OpenOptionsExt::share_mode`
6976 * `os::windows::fs::OpenOptionsExt::custom_flags`
6977 * `os::windows::fs::OpenOptionsExt::attributes`
6978 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6979 * `os::unix::fs::OpenOptionsExt::custom_flags`
6980 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6981 * `Default for sync::Weak`
6982 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6983 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6984 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6985 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6986 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6987 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6988 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6989 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6990 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6991 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6992 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6993 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6994 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6995 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6996 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6997 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6998 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6999 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7000 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7001 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7002 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7003 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7004 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7005 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7006 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7007 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7008 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7009 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7010 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7011 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7012 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7013 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7014 * Read/Write/RawFd impls for `UnixStream`
7015 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7016 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7017 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7018 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7019 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7020 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7021 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7022 * RawFd impls for `UnixListener`
7023 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7024 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7025 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7026 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7027 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7028 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7029 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7030 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7031 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7032 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7033 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7034 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7035 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7036 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7037 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7038 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7039 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7040 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7041 * RawFd impls for `UnixDatagram`
7042 * `{BTree,Hash}Map::values_mut`
7043 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7048 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7049 The semantics of this minor method are subtle and probably not what
7051 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7052 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7053 will fall back to `/dev/urandom` temporarily to avoid blocking
7054 during early boot](https://github.com/rust-lang/rust/pull/33086).
7055 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7056 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7057 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7058 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7059 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7060 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7061 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7065 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7066 This controls the runtime behavior of the `panic!` macro
7067 and can be either "unwind" (the default), or "abort".
7068 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7069 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7070 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7071 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7072 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7073 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7074 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7075 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7076 By default they are retried twice, which can be customized with the
7077 `net.retry` value in `.cargo/config`.
7078 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7079 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7080 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7081 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7082 Makes it possible to install multiple crates in parallel.
7083 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7084 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7085 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7086 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7087 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7088 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7093 * [rustc memory usage was reduced by refactoring the context used for
7094 type checking](https://github.com/rust-lang/rust/pull/33425).
7095 * [Speed up creation of `HashMap`s by caching the random keys used
7096 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7097 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7098 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7099 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7100 10x faster than the previous lookup tables.
7101 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7106 * Many incremental improvements to documentation and rustdoc.
7107 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7108 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7109 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7110 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7111 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7112 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7113 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7118 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7119 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7120 * [`std` no longer prints backtraces on platforms where the running
7121 module must be loaded with `env::current_exe`, which can't be relied
7122 on](https://github.com/rust-lang/rust/pull/33554).
7123 * This release includes std binaries for the i586-unknown-linux-gnu,
7124 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7125 i586 target is for old x86 hardware without SSE2, and the armv7
7126 target is for Android running on modern ARM architectures.
7127 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7128 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7129 * [On Unix the runtime aborts by calling `libc::abort` instead of
7130 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7131 * [Rust is now bootstrapped from the previous release of Rust,
7132 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7137 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7138 * [`target_env` for Linux ARM targets is just `gnu`, not
7139 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7140 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7141 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7142 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7143 Affects how macros are parsed.
7144 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7145 * [Feature-gated attributes on macro-generated macro invocations are
7146 now rejected](https://github.com/rust-lang/rust/pull/32791).
7147 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7148 This caused some minor changes to type inference.
7151 Version 1.9.0 (2016-05-26)
7152 ==========================
7157 * The `#[deprecated]` attribute when applied to an API will generate
7158 warnings when used. The warnings may be suppressed with
7159 `#[allow(deprecated)]`. [RFC 1270].
7160 * [`fn` item types are zero sized, and each `fn` names a unique
7161 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7162 `transmute` on a `fn` type will generate a warning for a few cycles,
7163 then will be converted to an error.
7164 * [Field and method resolution understand visibility, so private
7165 fields and methods cannot prevent the proper use of public fields
7166 and methods][1.9fv].
7167 * [The parser considers unicode codepoints in the
7168 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7174 * [`std::panic::catch_unwind`] (renamed from `recover`)
7175 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7176 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7177 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7178 * [`str::is_char_boundary`]
7179 * [`<*const T>::as_ref`]
7180 * [`<*mut T>::as_ref`]
7181 * [`<*mut T>::as_mut`]
7182 * [`AsciiExt::make_ascii_uppercase`]
7183 * [`AsciiExt::make_ascii_lowercase`]
7184 * [`char::decode_utf16`]
7185 * [`char::DecodeUtf16`]
7186 * [`char::DecodeUtf16Error`]
7187 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7188 * [`BTreeSet::take`]
7189 * [`BTreeSet::replace`]
7192 * [`HashSet::replace`]
7194 * [`OsString::with_capacity`]
7195 * [`OsString::clear`]
7196 * [`OsString::capacity`]
7197 * [`OsString::reserve`]
7198 * [`OsString::reserve_exact`]
7199 * [`OsStr::is_empty`]
7201 * [`std::os::unix::thread`]
7204 * [`JoinHandleExt::as_pthread_t`]
7205 * [`JoinHandleExt::into_pthread_t`]
7206 * [`HashSet::hasher`]
7207 * [`HashMap::hasher`]
7208 * [`CommandExt::exec`]
7209 * [`File::try_clone`]
7210 * [`SocketAddr::set_ip`]
7211 * [`SocketAddr::set_port`]
7212 * [`SocketAddrV4::set_ip`]
7213 * [`SocketAddrV4::set_port`]
7214 * [`SocketAddrV6::set_ip`]
7215 * [`SocketAddrV6::set_port`]
7216 * [`SocketAddrV6::set_flowinfo`]
7217 * [`SocketAddrV6::set_scope_id`]
7218 * [`slice::copy_from_slice`]
7219 * [`ptr::read_volatile`]
7220 * [`ptr::write_volatile`]
7221 * [`OpenOptions::create_new`]
7222 * [`TcpStream::set_nodelay`]
7223 * [`TcpStream::nodelay`]
7224 * [`TcpStream::set_ttl`]
7225 * [`TcpStream::ttl`]
7226 * [`TcpStream::set_only_v6`]
7227 * [`TcpStream::only_v6`]
7228 * [`TcpStream::take_error`]
7229 * [`TcpStream::set_nonblocking`]
7230 * [`TcpListener::set_ttl`]
7231 * [`TcpListener::ttl`]
7232 * [`TcpListener::set_only_v6`]
7233 * [`TcpListener::only_v6`]
7234 * [`TcpListener::take_error`]
7235 * [`TcpListener::set_nonblocking`]
7236 * [`UdpSocket::set_broadcast`]
7237 * [`UdpSocket::broadcast`]
7238 * [`UdpSocket::set_multicast_loop_v4`]
7239 * [`UdpSocket::multicast_loop_v4`]
7240 * [`UdpSocket::set_multicast_ttl_v4`]
7241 * [`UdpSocket::multicast_ttl_v4`]
7242 * [`UdpSocket::set_multicast_loop_v6`]
7243 * [`UdpSocket::multicast_loop_v6`]
7244 * [`UdpSocket::set_multicast_ttl_v6`]
7245 * [`UdpSocket::multicast_ttl_v6`]
7246 * [`UdpSocket::set_ttl`]
7247 * [`UdpSocket::ttl`]
7248 * [`UdpSocket::set_only_v6`]
7249 * [`UdpSocket::only_v6`]
7250 * [`UdpSocket::join_multicast_v4`]
7251 * [`UdpSocket::join_multicast_v6`]
7252 * [`UdpSocket::leave_multicast_v4`]
7253 * [`UdpSocket::leave_multicast_v6`]
7254 * [`UdpSocket::take_error`]
7255 * [`UdpSocket::connect`]
7256 * [`UdpSocket::send`]
7257 * [`UdpSocket::recv`]
7258 * [`UdpSocket::set_nonblocking`]
7263 * [`std::sync::Once` is poisoned if its initialization function
7265 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7266 * [Most types implement `fmt::Debug`][1.9db].
7267 * [The default buffer size used by `BufReader` and `BufWriter` was
7268 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7269 used by other languages.
7270 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7271 `Duration` additionally implements `*=` and `/=`][1.9ta].
7272 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7273 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7274 * [`Chain` implements `BufRead`][1.9ch].
7275 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7280 * [Cargo can now run concurrently][1.9cc].
7281 * [Top-level overrides allow specific revisions of crates to be
7282 overridden through the entire crate graph][1.9ct]. This is intended
7283 to make upgrades easier for large projects, by allowing crates to be
7284 forked temporarily until they've been upgraded and republished.
7285 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7286 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7287 on the commandline][1.9cf]. `rustc` arguments can also be specified
7288 in the `build.rustflags` configuration key.
7293 * [The time complexity of comparing variables for equivalence during type
7294 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7295 to major compilation time improvement in some scenarios.
7296 * [`ToString` is specialized for `str`, giving it the same performance
7297 as `to_owned`][1.9ts].
7298 * [Spawning processes with `Command::output` no longer creates extra
7300 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7301 for C-like enums][1.9cl].
7306 * [Passing the `--quiet` flag to a test runner will produce
7307 much-abbreviated output][1.9q].
7308 * The Rust Project now publishes std binaries for the
7309 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7310 `i586-pc-windows-msvc` targets.
7315 * [`std::sync::Once` is poisoned if its initialization function
7317 * [It is illegal to define methods with the same name in overlapping
7318 inherent `impl` blocks][1.9sn].
7319 * [`fn` item types are zero sized, and each `fn` names a unique
7320 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7321 `transmute` on a `fn` type will generate a warning for a few cycles,
7322 then will be converted to an error.
7323 * [Improvements to const evaluation may trigger new errors when integer
7324 literals are out of range][1.9ce].
7327 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7328 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7329 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7330 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7331 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7332 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7333 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7334 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7335 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7336 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7337 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7338 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7339 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7340 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7341 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7342 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7343 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7344 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7345 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7346 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7347 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7348 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7349 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7350 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7351 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7352 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7353 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7354 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7355 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7356 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7357 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7358 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7359 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7360 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7361 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7362 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7363 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7364 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7365 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7366 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7367 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7368 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7369 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7370 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7371 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7372 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7373 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7374 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7375 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7376 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7377 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7378 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7379 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7380 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7381 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7382 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7383 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7384 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7385 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7386 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7387 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7388 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7389 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7390 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7391 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7392 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7393 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7394 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7395 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7396 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7397 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7398 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7399 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7400 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7401 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7402 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7403 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7404 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7405 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7406 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7407 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7408 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7409 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7410 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7411 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7412 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7413 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7414 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7415 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7416 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7417 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7418 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7419 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7420 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7421 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7422 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7423 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7424 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7425 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7426 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7427 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7428 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7429 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7430 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7431 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7432 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7433 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7434 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7435 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7436 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7439 Version 1.8.0 (2016-04-14)
7440 ==========================
7445 * Rust supports overloading of compound assignment statements like
7446 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7447 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7448 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7450 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7451 addition to the non-braced form, `struct Foo;`. [RFC 218].
7457 * [`str::encode_utf16`] (renamed from `utf16_units`)
7458 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7461 * [`ptr::drop_in_place`]
7463 * [`time::SystemTime`]
7465 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7466 * [`Instant::elapsed`]
7467 * [`SystemTime::now`]
7468 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7469 * [`SystemTime::elapsed`]
7470 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7471 * [`SystemTimeError`]
7472 * [`SystemTimeError::duration`]
7473 * Various impls for `SystemTimeError`
7475 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7476 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7477 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7478 * [The `write!` and `writeln!` macros correctly emit errors if any of
7479 their arguments can't be formatted][1.8w].
7480 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7481 * [The Unix-specific `raw` modules, which contain a number of
7482 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7483 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7484 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7485 across platforms was making it difficult to implement `std`
7486 correctly. Those that need these definitions should use the `libc`
7488 * The Unix-specific `MetadataExt` traits, including
7489 `os::unix::fs::MetadataExt`, which expose values such as inode
7490 numbers [no longer return platform-specific types][1.8r], but
7491 instead return widened integers. [RFC 1415].
7492 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7493 * [Atomic loads and stores are not volatile][1.8a].
7494 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7499 * [Inlining hash functions lead to a 3% compile-time improvement in
7500 some workloads][1.8h].
7501 * When using jemalloc, its symbols are [unprefixed so that it
7502 overrides the libc malloc implementation][1.8h]. This means that for
7503 rustc, LLVM is now using jemalloc, which results in a 6%
7504 compile-time improvement on a specific workload.
7505 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7510 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7511 i686-pc-windows-msvc is now considered a tier-1 platform.
7512 * [The `--print targets` flag prints a list of supported targets][1.8t].
7513 * [The `--print cfg` flag prints the `cfg`s defined for the current
7515 * [`rustc` can be built with an new Cargo-based build system, written
7516 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7517 build system. To enable it configure with `configure --rustbuild`.
7518 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7519 variants while also indicating the total number of missing variants
7520 if more than 3][1.8m].
7521 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7522 * The Rust Project now publishes binary releases of the standard
7523 library for a number of tier-2 targets:
7524 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7525 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7526 `x86_64-rumprun-netbsd`. These can be installed with
7527 tools such as [multirust][1.8mr].
7532 * [`cargo init` creates a new Cargo project in the current
7533 directory][1.8ci]. It is otherwise like `cargo new`.
7534 * [Cargo has configuration keys for `-v` and
7535 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7536 `[term]` section of `.cargo/config`.
7537 * [Configuration keys that evaluate to strings or integers can be set
7538 via environment variables][1.8ce]. For example the `build.jobs` key
7539 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7540 precedence over config files.
7541 * [Target-specific dependencies support Rust `cfg` syntax for
7542 describing targets][1.8cfg] so that dependencies for multiple
7543 targets can be specified together. [RFC 1361].
7544 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7545 `RUSTDOC` take precedence over the `build.target-dir`,
7546 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7547 * [The child process tree is killed on Windows when Cargo is
7549 * [The `build.target` configuration value sets the target platform,
7550 like `--target`][1.8ct].
7555 * [Unstable compiler flags have been further restricted][1.8u]. Since
7556 1.0 `-Z` flags have been considered unstable, and other flags that
7557 were considered unstable additionally required passing `-Z
7558 unstable-options` to access. Unlike unstable language and library
7559 features though, these options have been accessible on the stable
7560 release channel. Going forward, *new unstable flags will not be
7561 available on the stable release channel*, and old unstable flags
7562 will warn about their usage. In the future, all unstable flags will
7563 be unavailable on the stable release channel.
7564 * [It is no longer possible to `match` on empty enum variants using
7565 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7566 * The Unix-specific `MetadataExt` traits, including
7567 `os::unix::fs::MetadataExt`, which expose values such as inode
7568 numbers [no longer return platform-specific types][1.8r], but
7569 instead return widened integers. [RFC 1415].
7570 * [Modules sourced from the filesystem cannot appear within arbitrary
7571 blocks, but only within other modules][1.8mf].
7572 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7573 * On Unix, [stack overflow triggers a runtime abort instead of a
7575 * [`Command::spawn` and its equivalents return an error if any of
7576 its command-line arguments contain interior `NUL`s][1.8n].
7577 * [Tuple and unit enum variants from other crates are in the type
7579 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7580 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7581 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7582 instead of `foo.lib`.
7585 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7586 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7587 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7588 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7589 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7590 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7591 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7592 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7593 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7594 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7595 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7596 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7597 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7598 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7599 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7600 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7601 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7602 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7603 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7604 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7605 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7606 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7607 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7608 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7609 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7610 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7611 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7612 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7613 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7614 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7615 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7616 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7617 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7618 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7619 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7620 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7621 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7622 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7623 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7624 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7625 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7626 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7627 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7628 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7629 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7630 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7631 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7632 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7633 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7634 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7635 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7636 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7637 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7638 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7639 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7640 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7641 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7642 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7643 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7644 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7647 Version 1.7.0 (2016-03-03)
7648 ==========================
7655 * [`Path::strip_prefix`] (renamed from relative_from)
7656 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7658 * [`Ipv4Addr::is_loopback`]
7659 * [`Ipv4Addr::is_private`]
7660 * [`Ipv4Addr::is_link_local`]
7661 * [`Ipv4Addr::is_multicast`]
7662 * [`Ipv4Addr::is_broadcast`]
7663 * [`Ipv4Addr::is_documentation`]
7665 * [`Ipv6Addr::is_unspecified`]
7666 * [`Ipv6Addr::is_loopback`]
7667 * [`Ipv6Addr::is_multicast`]
7670 * [`Vec::as_mut_slice`]
7672 * [`String::as_str`]
7673 * [`String::as_mut_str`]
7675 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7677 * `<[T]>::`[`sort_by_key`]
7678 * checked, saturated, and overflowing operations
7679 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7680 * [`i32::saturating_mul`]
7681 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7682 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7683 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7684 * [`u32::saturating_mul`]
7685 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7686 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7687 * and checked, saturated, and overflowing operations for other primitive types
7689 * [`ffi::IntoStringError`]
7690 * [`CString::into_string`]
7691 * [`CString::into_bytes`]
7692 * [`CString::into_bytes_with_nul`]
7693 * `From<CString> for Vec<u8>`
7695 * [`IntoStringError::into_cstring`]
7696 * [`IntoStringError::utf8_error`]
7697 * `Error for IntoStringError`
7699 * [`std::hash::BuildHasher`]
7700 * [`BuildHasher::Hasher`]
7701 * [`BuildHasher::build_hasher`]
7702 * [`std::hash::BuildHasherDefault`]
7703 * [`HashMap::with_hasher`]
7704 * [`HashMap::with_capacity_and_hasher`]
7705 * [`HashSet::with_hasher`]
7706 * [`HashSet::with_capacity_and_hasher`]
7707 * [`std::collections::hash_map::RandomState`]
7708 * [`RandomState::new`]
7709 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7710 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7711 from bytes is faster.
7712 * [The performance of `LineWriter` (and thus `io::stdout`) was
7713 improved by using `memchr` to search for newlines][1.7m].
7714 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7715 `f64` variants were stabilized previously.
7716 * [`BTreeMap` was rewritten to use less memory and improve the performance
7717 of insertion and iteration, the latter by as much as 5x][1.7bm].
7718 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7719 covariant over their contained type][1.7bt].
7720 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7721 over their contained type][1.7ll].
7722 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7724 * [`Any` is implemented for unsized types][1.7a].
7725 * [`Hash` is implemented for `Duration`][1.7h].
7730 * [When running tests with `--test`, rustdoc will pass `--cfg`
7731 arguments to the compiler][1.7dt].
7732 * [The compiler is built with RPATH information by default][1.7rpa].
7733 This means that it will be possible to run `rustc` when installed in
7734 unusual configurations without configuring the dynamic linker search
7736 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7737 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7738 over `LD_LIBRARY_PATH`.
7743 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7744 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7745 * [The `rerun-if-changed` build script directive no longer causes the
7746 build script to incorrectly run twice in certain scenarios][1.7rr].
7751 * Soundness fixes to the interactions between associated types and
7752 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7753 code that violates the new rules. This is a significant change that
7754 is known to break existing code, so it has emitted warnings for the
7755 new error cases since 1.4 to give crate authors time to adapt. The
7756 details of what is changing are subtle; read the RFC for more.
7757 * [Several bugs in the compiler's visibility calculations were
7758 fixed][1.7v]. Since this was found to break significant amounts of
7759 code, the new errors will be emitted as warnings for several release
7760 cycles, under the `private_in_public` lint.
7761 * Defaulted type parameters were accidentally accepted in positions
7762 that were not intended. In this release, [defaulted type parameters
7763 appearing outside of type definitions will generate a
7764 warning][1.7d], which will become an error in future releases.
7765 * [Parsing "." as a float results in an error instead of 0][1.7p].
7766 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7767 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7769 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7770 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7771 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7772 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7773 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7774 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7775 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7776 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7777 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7778 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7779 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7780 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7781 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7782 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7783 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7784 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7785 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7786 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7787 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7788 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7789 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7790 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7791 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7792 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7793 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7794 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7795 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7796 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7797 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7798 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7799 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7800 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7801 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7802 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7803 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7804 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7805 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7806 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7807 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7808 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7809 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7810 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7811 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7812 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7813 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7814 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7815 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7816 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7817 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7818 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7819 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7820 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7821 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7822 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7823 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7824 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7825 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7826 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7827 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7828 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7829 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7830 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7831 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7832 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7833 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7834 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7835 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7836 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7837 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7838 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7839 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7840 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7841 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7842 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7843 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7844 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7845 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7846 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7847 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7850 Version 1.6.0 (2016-01-21)
7851 ==========================
7856 * The `#![no_std]` attribute causes a crate to not be linked to the
7857 standard library, but only the [core library][1.6co], as described
7858 in [RFC 1184]. The core library defines common types and traits but
7859 has no platform dependencies whatsoever, and is the basis for Rust
7860 software in environments that cannot support a full port of the
7861 standard library, such as operating systems. Most of the core
7862 library is now stable.
7868 [`Read::read_exact`],
7869 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7870 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7871 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7872 [`os::unix::fs::DirBuilderExt`],
7873 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7874 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7875 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7876 [`collections::hash_map::Drain`],
7877 [`collections::hash_map::HashMap::drain`],
7878 [`collections::hash_set::Drain`],
7879 [`collections::hash_set::HashSet::drain`],
7880 [`collections::binary_heap::Drain`],
7881 [`collections::binary_heap::BinaryHeap::drain`],
7882 [`Vec::extend_from_slice`] (renamed from `push_all`),
7883 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7884 [`RwLock::into_inner`],
7885 [`Iterator::min_by_key`] (renamed from `min_by`),
7886 [`Iterator::max_by_key`] (renamed from `max_by`).
7887 * The [core library][1.6co] is stable, as are most of its APIs.
7888 * [The `assert_eq!` macro supports arguments that don't implement
7889 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7891 * Several timer functions that take duration in milliseconds [are
7892 deprecated in favor of those that take `Duration`][1.6ms]. These
7893 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7894 `thread::park_timeout_ms`.
7895 * The algorithm by which `Vec` reserves additional elements was
7896 [tweaked to not allocate excessive space][1.6a] while still growing
7898 * `From` conversions are [implemented from integers to floats][1.6f]
7899 in cases where the conversion is lossless. Thus they are not
7900 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7901 or `f64`. They are also not implemented for `isize` and `usize`
7902 because the implementations would be platform-specific. `From` is
7903 also implemented from `f32` to `f64`.
7904 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7905 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7906 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7907 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7909 * Sorting slices that are already sorted [is 50% faster in some
7915 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7916 * Cargo build scripts can specify their dependencies by emitting the
7917 [`rerun-if-changed`][1.6rr] key.
7918 * crates.io will reject publication of crates with dependencies that
7919 have a wildcard version constraint. Crates with wildcard
7920 dependencies were seen to cause a variety of problems, as described
7921 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7923 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7924 release folder. A variety of artifacts that Cargo failed to clean
7925 are now correctly deleted.
7930 * The `unreachable_code` lint [warns when a function call's argument
7932 * The parser indicates [failures that may be caused by
7933 confusingly-similar Unicode characters][1.6uc]
7934 * Certain macro errors [are reported at definition time][1.6m], not
7940 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7941 environment variable when locating crates. This was a pre-cargo
7942 feature for integrating with the package manager that was
7943 accidentally never removed.
7944 * [A number of bugs were fixed in the privacy checker][1.6p] that
7945 could cause previously-accepted code to break.
7946 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7947 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7948 struct pattern syntax (`Foo(..)`) can no longer be used to match
7949 unit structs. This is a warning now, but will become an error in
7950 future releases. Patterns that share the same name as a const are
7952 * A bug was fixed that causes [rustc not to apply default type
7953 parameters][1.6xc] when resolving certain method implementations of
7954 traits defined in other crates.
7956 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7957 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7958 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7959 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7960 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7961 [1.6co]: http://doc.rust-lang.org/core/index.html
7962 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7963 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7964 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7965 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7966 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7967 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7968 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7969 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7970 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7971 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7972 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7973 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7974 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7975 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7976 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7977 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7978 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7979 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7980 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7981 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7982 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7983 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7984 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7985 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7986 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7987 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7988 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7989 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7990 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7991 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7992 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7993 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7994 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7995 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7996 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7997 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7998 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7999 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8000 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8001 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8002 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8005 Version 1.5.0 (2015-12-10)
8006 ==========================
8008 * ~700 changes, numerous bugfixes
8014 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8015 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8016 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8017 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8018 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8019 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8020 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8021 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8022 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8023 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8024 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8025 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8026 [`Path::read_link`], [`Path::symlink_metadata`],
8027 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8028 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8029 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8030 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8031 [`slice::split_first_mut`], [`slice::split_first`],
8032 [`slice::split_last_mut`], [`slice::split_last`],
8033 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8034 [`str::MatchIndices`], [`str::RMatchIndices`],
8035 [`str::match_indices`], [`str::rmatch_indices`],
8036 [`str::slice_mut_unchecked`], [`string::ParseError`].
8037 * Rust applications hosted on crates.io can be installed locally to
8038 `~/.cargo/bin` with the [`cargo install`] command. Among other
8039 things this makes it easier to augment Cargo with new subcommands:
8040 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8041 invoked as `cargo foo`.
8042 * Crates with wildcard (`*`) dependencies will [emit warnings when
8043 published][1.5w]. In 1.6 it will no longer be possible to publish
8044 crates with wildcard dependencies.
8049 * The rules determining when a particular lifetime must outlive
8050 a particular value (known as '[dropck]') have been [modified
8051 to not rely on parametricity][1.5p].
8052 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8053 and `Arc`][1.5a]. Because these smart pointer types implement
8054 `Deref`, this causes breakage in cases where the interior type
8055 contains methods of the same name.
8056 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8057 that they could drop their content. Soundness fix.
8058 * All method invocations are [properly checked][1.5wf1] for
8059 [well-formedness][1.5wf2]. Soundness fix.
8060 * Traits whose supertraits contain `Self` are [not object
8061 safe][1.5o]. Soundness fix.
8062 * Target specifications support a [`no_default_libraries`][1.5nd]
8063 setting that controls whether `-nodefaultlibs` is passed to the
8064 linker, and in turn the `is_like_windows` setting no longer affects
8065 the `-nodefaultlibs` flag.
8066 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8067 * The `#[inline]` and `#[repr]` attributes [can only appear
8068 in valid locations][1.5at].
8069 * Native libraries linked from the local crate are [passed to
8070 the linker before native libraries from upstream crates][1.5nl].
8071 * Two rarely-used attributes, `#[no_debug]` and
8072 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8073 * Negation of unsigned integers, which has been a warning for
8074 several releases, [is now behind a feature gate and will
8075 generate errors][1.5nu].
8076 * The parser accidentally accepted visibility modifiers on
8077 enum variants, a bug [which has been fixed][1.5ev].
8078 * [A bug was fixed that allowed `use` statements to import unstable
8084 * When evaluating expressions at compile-time that are not
8085 compile-time constants (const-evaluating expressions in non-const
8086 contexts), incorrect code such as overlong bitshifts and arithmetic
8087 overflow will [generate a warning instead of an error][1.5ce],
8088 delaying the error until runtime. This will allow the
8089 const-evaluator to be expanded in the future backwards-compatibly.
8090 * The `improper_ctypes` lint [no longer warns about using `isize` and
8091 `usize` in FFI][1.5ict].
8096 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8098 * `Default` is [implemented for mutable slices][1.5d].
8099 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8100 * There are now `From` conversions [between floating point
8101 types][1.5f] where the conversions are lossless.
8102 * There are now `From` conversions [between integer types][1.5i] where
8103 the conversions are lossless.
8104 * [`fs::Metadata` implements `Clone`][1.5fs].
8105 * The `parse` method [accepts a leading "+" when parsing
8107 * [`AsMut` is implemented for `Vec`][1.5am].
8108 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8109 been optimized][1.5cf] and no longer rely on the default impl.
8110 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8111 `unsafe extern "C"` function types now [implement `Clone`,
8112 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8113 `fmt::Debug` for up to 12 arguments][1.5fp].
8114 * [Dropping `Vec`s is much faster in unoptimized builds when the
8115 element types don't implement `Drop`][1.5dv].
8116 * A bug that caused in incorrect behavior when [combining `VecDeque`
8117 with zero-sized types][1.5vdz] was resolved.
8118 * [`PartialOrd` for slices is faster][1.5po].
8123 * [Crate metadata size was reduced by 20%][1.5md].
8124 * [Improvements to code generation reduced the size of libcore by 3.3
8125 MB and rustc's memory usage by 18MB][1.5m].
8126 * [Improvements to deref translation increased performance in
8127 unoptimized builds][1.5dr].
8128 * Various errors in trait resolution [are deduplicated to only be
8129 reported once][1.5te].
8130 * Rust has preliminary [support for rumprun kernels][1.5rr].
8131 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8133 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8134 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8135 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8136 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8137 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8138 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8139 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8140 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8141 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8142 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8143 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8144 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8145 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8146 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8147 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8148 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8149 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8150 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8151 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8152 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8153 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8154 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8155 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8156 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8157 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8158 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8159 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8160 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8161 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8162 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8163 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8164 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8165 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8166 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8167 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8168 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8169 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8170 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8171 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8172 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8173 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8174 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8175 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8176 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8177 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8178 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8179 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8180 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8181 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8182 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8183 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8184 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8185 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8186 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8187 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8188 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8189 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8190 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8191 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8192 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8193 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8194 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8195 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8196 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8197 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8198 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8199 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8200 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8201 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8202 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8203 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8204 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8205 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8206 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8207 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8208 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8209 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8210 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8211 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8212 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8213 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8214 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8215 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8216 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8217 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8218 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8219 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8220 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8221 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8223 Version 1.4.0 (2015-10-29)
8224 ==========================
8226 * ~1200 changes, numerous bugfixes
8231 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8232 GNU) are now supported and recommended for use.
8237 * [Several changes have been made to fix type soundness and improve
8238 the behavior of associated types][sound]. See [RFC 1214]. Although
8239 we have mostly introduced these changes as warnings this release, to
8240 become errors next release, there are still some scenarios that will
8241 see immediate breakage.
8242 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8243 line breaks in addition to `\n`][crlf].
8244 * [Loans of `'static` lifetime extend to the end of a function][stat].
8245 * [`str::parse` no longer introduces avoidable rounding error when
8246 parsing floating point numbers. Together with earlier changes to
8247 float formatting/output, "round trips" like f.to_string().parse()
8248 now preserve the value of f exactly. Additionally, leading plus
8249 signs are now accepted][fp3].
8255 * `use` statements that import multiple items [can now rename
8256 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8257 * [Binops work correctly on fat pointers][binfat].
8258 * `pub extern crate`, which does not behave as expected, [issues a
8259 warning][pec] until a better solution is found.
8264 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8265 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8266 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8267 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8268 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8269 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8270 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8271 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8272 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8273 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8274 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8275 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8276 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8277 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8278 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8279 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8280 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8281 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8283 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8284 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8285 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8286 `f64::from_str_radix`.
8287 * [Reverse-searching strings is faster with the 'two-way'
8289 * [`std::io::copy` allows `?Sized` arguments][cc].
8290 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8291 [override `count`, `nth` and `last` with an O(1)
8292 implementation][it].
8293 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8294 * [`IntoRawFd` has been added to the Unix-specific prelude,
8295 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8297 * [`Extend<String>` and `FromIterator<String` are both implemented for
8299 * [`IntoIterator` is implemented for references to `Option` and
8301 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8302 Copy`][ext] as part of [RFC 839]. This will cause type inference
8303 breakage in rare situations.
8304 * [`BinaryHeap` implements `Debug`][bh2].
8305 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8307 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8308 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8309 * [String comparison is faster][faststr].
8310 * `&mut T` where `T: std::fmt::Write` [also implements
8311 `std::fmt::Write`][mutw].
8312 * [A stable regression in `VecDeque::push_back` and other
8313 capacity-altering methods that caused panics for zero-sized types
8315 * [Function pointers implement traits for up to 12 parameters][fp2].
8320 * The compiler [no longer uses the 'morestack' feature to prevent
8321 stack overflow][mm]. Instead it uses guard pages and stack
8322 probes (though stack probes are not yet implemented on any platform
8324 * [The compiler matches traits faster when projections are involved][p].
8325 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8327 * [Cargo now displays useful information about what its doing during
8328 `cargo update`][cu].
8330 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8331 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8332 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8333 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8334 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8335 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8336 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8337 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8338 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8339 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8340 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8341 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8342 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8343 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8344 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8345 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8346 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8347 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8348 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8349 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8350 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8351 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8352 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8353 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8354 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8355 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8356 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8357 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8358 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8359 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8360 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8361 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8362 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8363 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8364 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8365 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8366 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8367 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8368 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8369 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8370 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8371 [bh2]: https://github.com/rust-lang/rust/pull/28156
8372 [binfat]: https://github.com/rust-lang/rust/pull/28270
8373 [bm]: https://github.com/rust-lang/rust/pull/28197
8374 [cc]: https://github.com/rust-lang/rust/pull/27531
8375 [crlf]: https://github.com/rust-lang/rust/pull/28034
8376 [cu]: https://github.com/rust-lang/cargo/pull/1931
8377 [d]: https://github.com/rust-lang/rust/pull/27825
8378 [dep]: https://github.com/rust-lang/rust/pull/28339
8379 [es]: https://github.com/rust-lang/rust/pull/27956
8380 [ext]: https://github.com/rust-lang/rust/pull/28094
8381 [faststr]: https://github.com/rust-lang/rust/pull/28338
8382 [ffi]: https://github.com/rust-lang/rust/pull/28779
8383 [fp]: https://github.com/rust-lang/rust/pull/28268
8384 [fp2]: https://github.com/rust-lang/rust/pull/28560
8385 [fp3]: https://github.com/rust-lang/rust/pull/27307
8386 [i]: https://github.com/rust-lang/rust/pull/27451
8387 [into2]: https://github.com/rust-lang/rust/pull/28039
8388 [it]: https://github.com/rust-lang/rust/pull/27652
8389 [mm]: https://github.com/rust-lang/rust/pull/27338
8390 [mutw]: https://github.com/rust-lang/rust/pull/28368
8391 [sound]: https://github.com/rust-lang/rust/pull/27641
8392 [p]: https://github.com/rust-lang/rust/pull/27866
8393 [pec]: https://github.com/rust-lang/rust/pull/28486
8394 [pr]: https://github.com/rust-lang/rust/pull/27896
8395 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8396 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8397 [s]: https://github.com/rust-lang/rust/pull/27474
8398 [stab]: https://github.com/rust-lang/rust/pull/28339
8399 [stat]: https://github.com/rust-lang/rust/pull/28321
8400 [vd]: https://github.com/rust-lang/rust/pull/28494
8402 Version 1.3.0 (2015-09-17)
8403 ==============================
8405 * ~900 changes, numerous bugfixes
8410 * The [new object lifetime defaults][nold] have been [turned
8411 on][nold2] after a cycle of warnings about the change. Now types
8412 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8413 being interpreted as `&'a Box<Trait+'a>` to `&'a
8414 Box<Trait+'static>`.
8415 * [The Rustonomicon][nom] is a new book in the official documentation
8416 that dives into writing unsafe Rust.
8417 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8418 timekeeping is employed by other std APIs, as well as out-of-tree
8424 * The [new object lifetime defaults][nold] have been [turned
8425 on][nold2] after a cycle of warnings about the change.
8426 * There is a known [regression][lr] in how object lifetime elision is
8427 interpreted, the proper solution for which is undetermined.
8428 * The `#[prelude_import]` attribute, an internal implementation
8429 detail, was accidentally stabilized previously. [It has been put
8430 behind the `prelude_import` feature gate][pi]. This change is
8431 believed to break no existing code.
8432 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8433 [more sane for dynamically sized types][dst3]. Code that relied on
8434 the previous behavior is thought to be broken.
8435 * The `dropck` rules, which checks that destructors can't access
8436 destroyed values, [have been updated][dropck] to match the
8437 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8438 cause some previously-compiling code to no longer build.
8443 * The [new object lifetime defaults][nold] have been [turned
8444 on][nold2] after a cycle of warnings about the change.
8445 * Semicolons may [now follow types and paths in
8446 macros](https://github.com/rust-lang/rust/pull/27000).
8447 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8448 [more sane for dynamically sized types][dst3]. Code that relied on
8449 the previous behavior is not known to exist, and suspected to be
8451 * `'static` variables [may now be recursive][st].
8452 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8453 implementations correctly.
8454 * The `dropck` rules, which checks that destructors can't access
8455 destroyed values, [have been updated][dropck] to match the
8461 * The [`Duration`] API, [has been stabilized][ds], as well as the
8462 `std::time` module, which presently contains only `Duration`.
8463 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8464 * The owned C string, [`CString`], implements [`Borrow`] and the
8465 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8466 these allow C strings to be borrowed and cloned in generic code.
8467 * [`CStr`] implements [`Debug`].
8468 * [`AtomicPtr`] implements [`Debug`].
8469 * [`Error`] trait objects [can be downcast to their concrete types][e]
8470 in many common configurations, using the [`is`], [`downcast`],
8471 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8473 * Searching for substrings now [employs the two-way algorithm][search]
8474 instead of doing a naive search. This gives major speedups to a
8475 number of methods, including [`contains`][sc], [`find`][sf],
8476 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8477 [`ends_with`][sew] are also faster.
8478 * The performance of `PartialEq` for slices is [much faster][ps].
8479 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8480 is overridden and optimized by the implementations for scalars.
8481 * The [`Hasher`] trait now has a number of specialized `write_*`
8482 methods for primitive types, for efficiency.
8483 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8484 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8485 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8486 of [`std::error::Error::cause`][iec] also delegates to the inner
8488 * [`process::Child`][pc] gained the [`id`] method, which returns a
8489 `u32` representing the platform-specific process identifier.
8490 * The [`connect`] method on slices is deprecated, replaced by the new
8491 [`join`] method (note that both of these are on the *unstable*
8492 [`SliceConcatExt`] trait, but through the magic of the prelude are
8493 available to stable code anyway).
8494 * The [`Div`] operator is implemented for [`Wrapping`] types.
8495 * [`DerefMut` is implemented for `String`][dms].
8496 * Performance of SipHash (the default hasher for `HashMap`) is
8497 [better for long data][sh].
8498 * [`AtomicPtr`] implements [`Send`].
8499 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8500 are now [specialized to use uninitialized buffers for increased
8502 * Lifetime parameters of foreign functions [are now resolved
8508 * Rust can now, with some coercion, [produce programs that run on
8509 Windows XP][xp], though XP is not considered a supported platform.
8510 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8511 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8512 recommended for use in 1.3, though should be fully-functional
8513 in the [64-bit 1.4 beta][b14].
8514 * On Fedora-based systems installation will [properly configure the
8515 dynamic linker][fl].
8516 * The compiler gained many new extended error descriptions, which can
8517 be accessed with the `--explain` flag.
8518 * The `dropck` pass, which checks that destructors can't access
8519 destroyed values, [has been rewritten][dropck]. This fixes some
8520 soundness holes, and as such will cause some previously-compiling
8521 code to no longer build.
8522 * `rustc` now uses [LLVM to write archive files where possible][ar].
8523 Eventually this will eliminate the compiler's dependency on the ar
8525 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8526 supported FreeBSD on x86_64).
8527 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8528 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8530 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8531 will kill the process instead of leaking][nlp].
8533 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8534 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8535 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8536 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8537 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8538 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8539 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8540 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8541 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8542 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8543 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8544 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8545 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8546 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8547 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8548 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8549 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8550 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8551 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8552 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8553 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8554 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8555 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8556 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8557 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8558 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8559 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8560 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8561 [ar]: https://github.com/rust-lang/rust/pull/26926
8562 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8563 [dms]: https://github.com/rust-lang/rust/pull/26241
8564 [dropck]: https://github.com/rust-lang/rust/pull/27261
8565 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8566 [ds]: https://github.com/rust-lang/rust/pull/26818
8567 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8568 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8569 [dst3]: https://github.com/rust-lang/rust/pull/27351
8570 [e]: https://github.com/rust-lang/rust/pull/24793
8571 [f]: https://github.com/rust-lang/rust/pull/26588
8572 [fb]: https://github.com/rust-lang/rust/pull/26959
8573 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8574 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8575 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8576 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8577 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8578 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8579 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8580 [lic]: https://github.com/rust-lang/rust/pull/26583
8581 [lnu]: https://github.com/rust-lang/rust/pull/27026
8582 [lr]: https://github.com/rust-lang/rust/issues/27248
8583 [lum]: https://github.com/rust-lang/rust/pull/26378
8584 [lur]: https://github.com/rust-lang/rust/pull/26783
8585 [nlp]: https://github.com/rust-lang/rust/pull/27176
8586 [nold2]: https://github.com/rust-lang/rust/pull/27045
8587 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8588 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8589 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8590 [pi]: https://github.com/rust-lang/rust/pull/26699
8591 [ps]: https://github.com/rust-lang/rust/pull/26884
8592 [rte]: https://github.com/rust-lang/rust/pull/26950
8593 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8594 [search]: https://github.com/rust-lang/rust/pull/26327
8595 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8596 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8597 [sh]: https://github.com/rust-lang/rust/pull/27280
8598 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8599 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8600 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8601 [st]: https://github.com/rust-lang/rust/pull/26630
8602 [win1]: https://github.com/rust-lang/rust/pull/26569
8603 [win2]: https://github.com/rust-lang/rust/pull/26741
8604 [win3]: https://github.com/rust-lang/rust/pull/26741
8605 [win4]: https://github.com/rust-lang/rust/pull/27210
8606 [xp]: https://github.com/rust-lang/rust/pull/26569
8608 Version 1.2.0 (2015-08-07)
8609 ==========================
8611 * ~1200 changes, numerous bugfixes
8616 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8617 like `Rc` to contain types without a fixed size, arrays and trait
8618 objects, finally enabling use of `Rc<[T]>` and completing the
8619 implementation of DST.
8620 * [Parallel codegen][parcodegen] is now working again, which can
8621 substantially speed up large builds in debug mode; It also gets
8622 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8623 jobs). It's not enabled by default, but will be "in the near
8624 future". It can be activated with the `-C codegen-units=N` flag to
8626 * This is the first release with [experimental support for linking
8627 with the MSVC linker and lib C on Windows (instead of using the GNU
8628 variants via MinGW)][win]. It is yet recommended only for the most
8629 intrepid Rustaceans.
8630 * Benchmark compilations are showing a 30% improvement in
8631 bootstrapping over 1.1.
8636 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8637 unicode case mapping, which is a previously-planned change in
8638 behavior and considered a bugfix.
8639 * [`mem::align_of`] now specifies [the *minimum alignment* for
8640 T][align], which is usually the alignment programs are interested
8641 in, and the same value reported by clang's
8642 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8644 * [The `#[packed]` attribute is no longer silently accepted by the
8645 compiler][packed]. This attribute did nothing and code that
8646 mentioned it likely did not work as intended.
8647 * Associated type defaults are [now behind the
8648 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8649 defaults *did not work*, but could be mentioned syntactically. As
8650 such this breakage has minimal impact.
8655 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8656 matching against dereferenceable values.
8661 * The [`Extend`] trait, which grows a collection from an iterator, is
8662 implemented over iterators of references, for `String`, `Vec`,
8663 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8664 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8665 * The [`iter::once`] function returns an iterator that yields a single
8666 element, and [`iter::empty`] returns an iterator that yields no
8668 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8669 over substring matches.
8670 * [`Cell`] and [`RefCell`] both implement `Eq`.
8671 * A number of methods for wrapping arithmetic are added to the
8672 integral types, [`wrapping_div`], [`wrapping_rem`],
8673 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8674 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8675 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8676 type.. It is illegal for the default arithmetic operations in Rust
8677 to overflow; the desire to wrap must be explicit.
8678 * The `{:#?}` formatting specifier [displays the alternate,
8679 pretty-printed][debugfmt] form of the `Debug` formatter. This
8680 feature was actually introduced prior to 1.0 with little
8682 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8683 for writing data to formatted strings, similar to [`io::Write`].
8684 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8685 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8686 are used by code generators to emit implementations of [`Debug`].
8687 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8688 methods that convert case, following Unicode case mapping.
8689 * It is now easier to handle poisoned locks. The [`PoisonError`]
8690 type, returned by failing lock operations, exposes `into_inner`,
8691 `get_ref`, and `get_mut`, which all give access to the inner lock
8692 guard, and allow the poisoned lock to continue to operate. The
8693 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8694 poisoned lock without attempting to take the lock.
8695 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8696 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8697 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8698 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8700 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8706 * `rustc` employs smarter heuristics for guessing at [typos].
8707 * `rustc` emits more efficient code for [no-op conversions between
8708 unsafe pointers][nop].
8709 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8710 resulting in faster compile times and smaller code.
8712 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8713 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8714 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8715 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8716 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8717 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8718 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8719 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8720 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8721 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8722 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8723 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8724 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8725 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8726 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8727 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8728 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8729 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8730 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8731 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8732 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8733 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8734 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8735 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8736 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8737 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8738 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8739 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8740 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8741 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8742 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8743 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8744 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8745 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8746 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8747 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8748 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8749 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8750 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8751 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8752 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8753 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8754 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8755 [align]: https://github.com/rust-lang/rust/pull/25646
8756 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8757 [typos]: https://github.com/rust-lang/rust/pull/26087
8758 [nop]: https://github.com/rust-lang/rust/pull/26336
8759 [fat]: https://github.com/rust-lang/rust/pull/26411
8760 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8761 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8762 [packed]: https://github.com/rust-lang/rust/pull/25541
8763 [ad]: https://github.com/rust-lang/rust/pull/27382
8764 [win]: https://github.com/rust-lang/rust/pull/25350
8766 Version 1.1.0 (2015-06-25)
8767 =========================
8769 * ~850 changes, numerous bugfixes
8774 * The [`std::fs` module has been expanded][fs] to expand the set of
8775 functionality exposed:
8776 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8777 don't incur a syscall on some platforms.
8778 * A `symlink_metadata` function has been added.
8779 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8780 access to all underlying information.
8781 * The compiler now contains extended explanations of many errors. When an error
8782 with an explanation occurs the compiler suggests using the `--explain` flag
8783 to read the explanation. Error explanations are also [available online][err-index].
8784 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8785 well as other work, the time to bootstrap the compiler decreased by
8791 * The [`str::split_whitespace`] method splits a string on unicode
8792 whitespace boundaries.
8793 * On both Windows and Unix, new extension traits provide conversion of
8794 I/O types to and from the underlying system handles. On Unix, these
8795 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8796 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8797 `TcpListener`, and `UpdSocket`. Further implementations for
8798 `std::process` will be stabilized later.
8799 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8800 Windows, symlinks can be created with
8801 `std::os::windows::symlink_dir` and
8802 `std::os::windows::symlink_file`.
8803 * The `mpsc::Receiver` type can now be converted into an iterator with
8804 `into_iter` on the [`IntoIterator`] trait.
8805 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8806 implementation of the [`From`] trait.
8807 * The `Debug` implementation for `RangeFull` [creates output that is
8808 more consistent with other implementations][rf].
8809 * [`Debug` is implemented for `File`][file].
8810 * The `Default` implementation for `Arc` [no longer requires `Sync +
8812 * [The `Iterator` methods `count`, `nth`, and `last` have been
8813 overridden for slices to have O(1) performance instead of O(n)][si].
8814 * Incorrect handling of paths on Windows has been improved in both the
8815 compiler and the standard library.
8816 * [`AtomicPtr` gained a `Default` implementation][ap].
8817 * In accordance with Rust's policy on arithmetic overflow `abs` now
8818 [panics on overflow when debug assertions are enabled][abs].
8819 * The [`Cloned`] iterator, which was accidentally left unstable for
8820 1.0 [has been stabilized][c].
8821 * The [`Incoming`] iterator, which iterates over incoming TCP
8822 connections, and which was accidentally unnamable in 1.0, [is now
8823 properly exported][inc].
8824 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8825 `sift_up` or `sift_down` panic][bh].
8826 * The [`split_off`] method of `LinkedList` [no longer corrupts
8827 the list in certain scenarios][ll].
8832 * Type checking performance [has improved notably][sk] with
8833 [multiple improvements][pre].
8834 * The compiler [suggests code changes][ch] for more errors.
8835 * rustc and it's build system have experimental support for [building
8836 toolchains against MUSL][m] instead of glibc on Linux.
8837 * The compiler defines the `target_env` cfg value, which is used for
8838 distinguishing toolchains that are otherwise for the same
8839 platform. Presently this is set to `gnu` for common GNU Linux
8840 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8841 * The [`cargo rustc`][crc] command invokes a build with custom flags
8843 * [Android executables are always position independent][pie].
8844 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8847 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8848 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8849 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8850 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8851 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8852 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8853 [rf]: https://github.com/rust-lang/rust/pull/24491
8854 [err-index]: https://doc.rust-lang.org/error-index.html
8855 [sk]: https://github.com/rust-lang/rust/pull/24615
8856 [pre]: https://github.com/rust-lang/rust/pull/25323
8857 [file]: https://github.com/rust-lang/rust/pull/24598
8858 [ch]: https://github.com/rust-lang/rust/pull/24683
8859 [arc]: https://github.com/rust-lang/rust/pull/24695
8860 [si]: https://github.com/rust-lang/rust/pull/24701
8861 [ap]: https://github.com/rust-lang/rust/pull/24834
8862 [m]: https://github.com/rust-lang/rust/pull/24777
8863 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8864 [crc]: https://github.com/rust-lang/cargo/pull/1568
8865 [pie]: https://github.com/rust-lang/rust/pull/24953
8866 [abs]: https://github.com/rust-lang/rust/pull/25441
8867 [c]: https://github.com/rust-lang/rust/pull/25496
8868 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8869 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8870 [inc]: https://github.com/rust-lang/rust/pull/25522
8871 [bh]: https://github.com/rust-lang/rust/pull/25856
8872 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8873 [ll]: https://github.com/rust-lang/rust/pull/26022
8874 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8875 [drop]: https://github.com/rust-lang/rust/pull/24935
8877 Version 1.0.0 (2015-05-15)
8878 ========================
8880 * ~1500 changes, numerous bugfixes
8885 * The vast majority of the standard library is now `#[stable]`. It is
8886 no longer possible to use unstable features with a stable build of
8888 * Many popular crates on [crates.io] now work on the stable release
8890 * Arithmetic on basic integer types now [checks for overflow in debug
8896 * Several [restrictions have been added to trait coherence][coh] in
8897 order to make it easier for upstream authors to change traits
8898 without breaking downstream code.
8899 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8900 improve error messages and macro behavior. For example, `0b1234` is
8901 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8902 * Trait bounds [are always invariant][inv], eliminating the need for
8903 the `PhantomFn` and `MarkerTrait` lang items, which have been
8905 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8906 "foo" as bar` syntax has been replaced with `extern crate foo as
8907 bar`, and Cargo now automatically translates "-" in *package* names
8908 to underscore for the crate name.
8909 * [Lifetime shadowing is an error][lt].
8910 * [`Send` no longer implies `'static`][send-rfc].
8911 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8912 `MyType::default()`.
8913 * Primitive types [now have inherent methods][prim-inherent],
8914 obviating the need for extension traits like `SliceExt`.
8915 * Methods with `Self: Sized` in their `where` clause are [considered
8916 object-safe][self-sized], allowing many extension traits like
8917 `IteratorExt` to be merged into the traits they extended.
8918 * You can now [refer to associated types][assoc-where] whose
8919 corresponding trait bounds appear only in a `where` clause.
8920 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8921 like `Send` and `Sync` are now library-defined.
8922 * A [Reflect trait][reflect] was introduced, which means that
8923 downcasting via the `Any` trait is effectively limited to concrete
8924 types. This helps retain the potentially-important "parametricity"
8925 property: generic code cannot behave differently for different type
8926 arguments except in minor ways.
8927 * The `unsafe_destructor` feature is now deprecated in favor of the
8928 [new `dropck`][dropck]. This change is a major reduction in unsafe
8934 * The `thread_local` module [has been renamed to `std::thread`][th].
8935 * The methods of `IteratorExt` [have been moved to the `Iterator`
8937 * Several traits that implement Rust's conventions for type
8938 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8939 [centralized in the `std::convert` module][con].
8940 * The `FromError` trait [was removed in favor of `From`][fe].
8941 * The basic sleep function [has moved to
8942 `std::thread::sleep_ms`][slp].
8943 * The `splitn` function now takes an `n` parameter that represents the
8944 number of items yielded by the returned iterator [instead of the
8945 number of 'splits'][spl].
8946 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8947 * [Derived implementations of `PartialOrd` now order enums according
8948 to their explicitly-assigned discriminants][po].
8949 * [Methods for searching strings are generic over `Pattern`s][pat],
8950 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8952 * [In method resolution, object methods are resolved before inherent
8954 * [`String::from_str` has been deprecated in favor of the `From` impl,
8955 `String::from`][sf].
8956 * [`io::Error` implements `Sync`][ios].
8957 * [The `words` method on `&str` has been replaced with
8958 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8960 * The new path and IO modules are complete and `#[stable]`. This
8961 was the major library focus for this cycle.
8962 * The path API was [revised][path-normalize] to normalize `.`,
8963 adjusting the tradeoffs in favor of the most common usage.
8964 * A large number of remaining APIs in `std` were also stabilized
8965 during this cycle; about 75% of the non-deprecated API surface
8967 * The new [string pattern API][string-pattern] landed, which makes
8968 the string slice API much more internally consistent and flexible.
8969 * A new set of [generic conversion traits][conversion] replaced
8970 many existing ad hoc traits.
8971 * Generic numeric traits were [completely removed][num-traits]. This
8972 was made possible thanks to inherent methods for primitive types,
8973 and the removal gives maximal flexibility for designing a numeric
8974 hierarchy in the future.
8975 * The `Fn` traits are now related via [inheritance][fn-inherit]
8976 and provide ergonomic [blanket implementations][fn-blanket].
8977 * The `Index` and `IndexMut` traits were changed to
8978 [take the index by value][index-value], enabling code like
8979 `hash_map["string"]` to work.
8980 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8981 `Copy` data is known to be `Clone` as well.
8986 * Many errors now have extended explanations that can be accessed with
8987 the `--explain` flag to `rustc`.
8988 * Many new examples have been added to the standard library
8990 * rustdoc has received a number of improvements focused on completion
8992 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8993 * Much headway was made on ecosystem-wide CI, making it possible
8994 to [compare builds for breakage][ci-compare].
8997 [crates.io]: http://crates.io
8998 [clo]: https://github.com/rust-lang/rust/pull/24034
8999 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9000 [con]: https://github.com/rust-lang/rust/pull/23875
9001 [cr]: https://github.com/rust-lang/rust/pull/23419
9002 [fe]: https://github.com/rust-lang/rust/pull/23879
9003 [ie]: https://github.com/rust-lang/rust/pull/23300
9004 [inv]: https://github.com/rust-lang/rust/pull/23938
9005 [ios]: https://github.com/rust-lang/rust/pull/24133
9006 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9007 [lt]: https://github.com/rust-lang/rust/pull/24057
9008 [meth]: https://github.com/rust-lang/rust/pull/24056
9009 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9010 [po]: https://github.com/rust-lang/rust/pull/24270
9011 [sf]: https://github.com/rust-lang/rust/pull/24517
9012 [slp]: https://github.com/rust-lang/rust/pull/23949
9013 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9014 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9015 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9016 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9017 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9018 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9019 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9020 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9021 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9022 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9023 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9024 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9025 [reflect]: https://github.com/rust-lang/rust/pull/23712
9026 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9027 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9028 [index-value]: https://github.com/rust-lang/rust/pull/23601
9029 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9030 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9031 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9032 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9033 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9034 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9037 Version 1.0.0-alpha.2 (2015-02-20)
9038 =====================================
9040 * ~1300 changes, numerous bugfixes
9044 * The various I/O modules were [overhauled][io-rfc] to reduce
9045 unnecessary abstractions and provide better interoperation with
9046 the underlying platform. The old `io` module remains temporarily
9048 * The standard library now [participates in feature gating][feat],
9049 so use of unstable libraries now requires a `#![feature(...)]`
9050 attribute. The impact of this change is [described on the
9051 forum][feat-forum]. [RFC][feat-rfc].
9055 * `for` loops [now operate on the `IntoIterator` trait][into],
9056 which eliminates the need to call `.iter()`, etc. to iterate
9057 over collections. There are some new subtleties to remember
9058 though regarding what sort of iterators various types yield, in
9059 particular that `for foo in bar { }` yields values from a move
9060 iterator, destroying the original collection. [RFC][into-rfc].
9061 * Objects now have [default lifetime bounds][obj], so you don't
9062 have to write `Box<Trait+'static>` when you don't care about
9063 storing references. [RFC][obj-rfc].
9064 * In types that implement `Drop`, [lifetimes must outlive the
9065 value][drop]. This will soon make it possible to safely
9066 implement `Drop` for types where `#[unsafe_destructor]` is now
9067 required. Read the [gorgeous RFC][drop-rfc] for details.
9068 * The fully qualified <T as Trait>::X syntax lets you set the Self
9069 type for a trait method or associated type. [RFC][ufcs-rfc].
9070 * References to types that implement `Deref<U>` now [automatically
9071 coerce to references][deref] to the dereferenced type `U`,
9072 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9073 should eliminate many unsightly uses of `&*`, as when converting
9074 from references to vectors into references to
9075 slices. [RFC][deref-rfc].
9076 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9077 `|:|`) is obsolete and closure kind is inferred from context.
9078 * [`Self` is a keyword][Self].
9082 * The `Show` and `String` formatting traits [have been
9083 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9084 their related purposes. Automatically getting a string
9085 conversion to use with `format!("{:?}", something_to_debug)` is
9086 now written `#[derive(Debug)]`.
9087 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9088 OsStr}`, provide strings in platform-specific encodings for easier
9089 interop with system APIs. [RFC][osstr-rfc].
9090 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9091 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9092 creating raw pointers.
9096 * Certain long error messages of the form 'expected foo found bar'
9097 are now [split neatly across multiple
9098 lines][multiline]. Examples in the PR.
9099 * On Unix Rust can be [uninstalled][un] by running
9100 `/usr/local/lib/rustlib/uninstall.sh`.
9101 * The `#[rustc_on_unimplemented]` attribute, requiring the
9102 'on_unimplemented' feature, lets rustc [display custom error
9103 messages when a trait is expected to be implemented for a type
9108 * Rust is tested against a [LALR grammar][lalr], which parses
9109 almost all the Rust files that rustc does.
9111 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9112 [close]: https://github.com/rust-lang/rust/pull/21843
9113 [deref]: https://github.com/rust-lang/rust/pull/21351
9114 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9115 [drop]: https://github.com/rust-lang/rust/pull/21972
9116 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9117 [feat]: https://github.com/rust-lang/rust/pull/21248
9118 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9119 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9120 [fmt]: https://github.com/rust-lang/rust/pull/21457
9121 [into]: https://github.com/rust-lang/rust/pull/20790
9122 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9123 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9124 [lalr]: https://github.com/rust-lang/rust/pull/21452
9125 [multiline]: https://github.com/rust-lang/rust/pull/19870
9126 [obj]: https://github.com/rust-lang/rust/pull/22230
9127 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9128 [onun]: https://github.com/rust-lang/rust/pull/20889
9129 [osstr]: https://github.com/rust-lang/rust/pull/21488
9130 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9131 [Self]: https://github.com/rust-lang/rust/pull/22158
9132 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9133 [un]: https://github.com/rust-lang/rust/pull/22256
9136 Version 1.0.0-alpha (2015-01-09)
9137 ==================================
9139 * ~2400 changes, numerous bugfixes
9143 * The language itself is considered feature complete for 1.0,
9144 though there will be many usability improvements and bugfixes
9145 before the final release.
9146 * Nearly 50% of the public API surface of the standard library has
9147 been declared 'stable'. Those interfaces are unlikely to change
9149 * The long-running debate over integer types has been
9150 [settled][ints]: Rust will ship with types named `isize` and
9151 `usize`, rather than `int` and `uint`, for pointer-sized
9152 integers. Guidelines will be rolled out during the alpha cycle.
9153 * Most crates that are not `std` have been moved out of the Rust
9154 distribution into the Cargo ecosystem so they can evolve
9155 separately and don't need to be stabilized as quickly, including
9156 'time', 'getopts', 'num', 'regex', and 'term'.
9157 * Documentation continues to be expanded with more API coverage, more
9158 examples, and more in-depth explanations. The guides have been
9159 consolidated into [The Rust Programming Language][trpl].
9160 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9161 * All official Rust binary installers now come with [Cargo], the
9162 Rust package manager.
9166 * Closures have been [completely redesigned][unboxed] to be
9167 implemented in terms of traits, can now be used as generic type
9168 bounds and thus monomorphized and inlined, or via an opaque
9169 pointer (boxed) as in the old system. The new system is often
9170 referred to as 'unboxed' closures.
9171 * Traits now support [associated types][assoc], allowing families
9172 of related types to be defined together and used generically in
9174 * Enum variants are [namespaced by their type names][enum].
9175 * [`where` clauses][where] provide a more versatile and attractive
9176 syntax for specifying generic bounds, though the previous syntax
9178 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9180 * Rust [no longer has a runtime][rt] of any description, and only
9181 supports OS threads, not green threads.
9182 * At long last, Rust has been overhauled for 'dynamically-sized
9183 types' ([DST]), which integrates 'fat pointers' (object types,
9184 arrays, and `str`) more deeply into the type system, making it
9186 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9187 `..j` that produce range types and which, when combined with the
9188 `Index` operator and multidispatch, leads to a convenient slice
9190 * The new range syntax revealed an ambiguity in the fixed-length
9191 array syntax, so now fixed length arrays [are written `[T;
9193 * The `Copy` trait is no longer implemented automatically. Unsafe
9194 pointers no longer implement `Sync` and `Send` so types
9195 containing them don't automatically either. `Sync` and `Send`
9196 are now 'unsafe traits' so one can "forcibly" implement them via
9197 `unsafe impl` if a type confirms to the requirements for them
9198 even though the internals do not (e.g. structs containing unsafe
9199 pointers like `Arc`). These changes are intended to prevent some
9200 footguns and are collectively known as [opt-in built-in
9201 traits][oibit] (though `Sync` and `Send` will soon become pure
9202 library types unknown to the compiler).
9203 * Operator traits now take their operands [by value][ops], and
9204 comparison traits can use multidispatch to compare one type
9205 against multiple other types, allowing e.g. `String` to be
9206 compared with `&str`.
9207 * `if let` and `while let` are no longer feature-gated.
9208 * Rust has adopted a more [uniform syntax for escaping unicode
9209 characters][unicode].
9210 * `macro_rules!` [has been declared stable][mac]. Though it is a
9211 flawed system it is sufficiently popular that it must be usable
9212 for 1.0. Effort has gone into [future-proofing][mac-future] it
9213 in ways that will allow other macro systems to be developed in
9214 parallel, and won't otherwise impact the evolution of the
9216 * The prelude has been [pared back significantly][prelude] such
9217 that it is the minimum necessary to support the most pervasive
9218 code patterns, and through [generalized where clauses][where]
9219 many of the prelude extension traits have been consolidated.
9220 * Rust's rudimentary reflection [has been removed][refl], as it
9221 incurred too much code generation for little benefit.
9222 * [Struct variants][structvars] are no longer feature-gated.
9223 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9224 known as 'higher-ranked trait bounds', this crucially allows
9225 unboxed closures to work.
9226 * Macros invocations surrounded by parens or square brackets and
9227 not terminated by a semicolon are [parsed as
9228 expressions][macros], which makes expressions like `vec![1i32,
9229 2, 3].len()` work as expected.
9230 * Trait objects now implement their traits automatically, and
9231 traits that can be coerced to objects now must be [object
9233 * Automatically deriving traits is now done with `#[derive(...)]`
9234 not `#[deriving(...)]` for [consistency with other naming
9235 conventions][derive].
9236 * Importing the containing module or enum at the same time as
9237 items or variants they contain is [now done with `self` instead
9238 of `mod`][self], as in use `foo::{self, bar}`
9239 * Glob imports are no longer feature-gated.
9240 * The `box` operator and `box` patterns have been feature-gated
9241 pending a redesign. For now unique boxes should be allocated
9242 like other containers, with `Box::new`.
9246 * A [series][coll1] of [efforts][coll2] to establish
9247 [conventions][coll3] for collections types has resulted in API
9248 improvements throughout the standard library.
9249 * New [APIs for error handling][err] provide ergonomic interop
9250 between error types, and [new conventions][err-conv] describe
9251 more clearly the recommended error handling strategies in Rust.
9252 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9253 it is easier to discuss failure in the context of error handling
9254 without making clarifications as to whether you are referring to
9255 the 'fail' macro or failure more generally.
9256 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9257 syscall when available.
9258 * The 'serialize' crate has been renamed 'rustc-serialize' and
9259 moved out of the distribution to Cargo. Although it is widely
9260 used now, it is expected to be superseded in the near future.
9261 * The `Show` formatter, typically implemented with
9262 `#[derive(Show)]` is [now requested with the `{:?}`
9263 specifier][show] and is intended for use by all types, for uses
9264 such as `println!` debugging. The new `String` formatter must be
9265 implemented by hand, uses the `{}` specifier, and is intended
9266 for full-fidelity conversions of things that can logically be
9267 represented as strings.
9271 * [Flexible target specification][flex] allows rustc's code
9272 generation to be configured to support otherwise-unsupported
9274 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9275 respective debuggers with Rust-appropriate pretty-printing.
9276 * The Windows installation of Rust is distributed with the
9277 MinGW components currently required to link binaries on that
9282 * Nullable enum optimizations have been extended to more types so
9283 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9284 space than the inner types themselves.
9285 * Work has begun on supporting AArch64.
9287 [Cargo]: https://crates.io
9288 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9289 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9290 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9291 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9292 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9293 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9294 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9295 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9296 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9297 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9298 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9299 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9300 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9301 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9302 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9303 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9304 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9305 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9306 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9307 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9308 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9309 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9310 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9311 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9312 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9313 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9314 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9315 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9316 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9317 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9318 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9319 [trpl]: https://doc.rust-lang.org/book/index.html
9320 [rbe]: http://rustbyexample.com/
9323 Version 0.12.0 (2014-10-09)
9324 =============================
9326 * ~1900 changes, numerous bugfixes
9330 * The introductory documentation (now called The Rust Guide) has
9331 been completely rewritten, as have a number of supplementary
9333 * Rust's package manager, Cargo, continues to improve and is
9334 sometimes considered to be quite awesome.
9335 * Many API's in `std` have been reviewed and updated for
9336 consistency with the in-development Rust coding
9337 guidelines. The standard library documentation tracks
9338 stabilization progress.
9339 * Minor libraries have been moved out-of-tree to the rust-lang org
9340 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9341 be installed with Cargo.
9342 * Lifetime elision allows lifetime annotations to be left off of
9343 function declarations in many common scenarios.
9344 * Rust now works on 64-bit Windows.
9347 * Indexing can be overloaded with the `Index` and `IndexMut`
9349 * The `if let` construct takes a branch only if the `let` pattern
9350 matches, currently behind the 'if_let' feature gate.
9351 * 'where clauses', a more flexible syntax for specifying trait
9352 bounds that is more aesthetic, have been added for traits and
9353 free functions. Where clauses will in the future make it
9354 possible to constrain associated types, which would be
9355 impossible with the existing syntax.
9356 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9357 the 'slicing_syntax' feature gate, and can be overloaded with
9358 the `Slice` or `SliceMut` traits.
9359 * The syntax for matching of sub-slices has been changed to use a
9360 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9361 consistency with other uses of `..` and to future-proof
9362 potential additional uses of the syntax.
9363 * The syntax for matching inclusive ranges in patterns has changed
9364 from `0..3` to `0...4` to be consistent with the exclusive range
9366 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9367 c]`) has been put behind the 'advanced_slice_patterns' feature
9368 gate and may be removed in the future.
9369 * Components of tuples and tuple structs can be extracted using
9370 the `value.0` syntax, currently behind the `tuple_indexing`
9372 * The `#[crate_id]` attribute is no longer supported; versioning
9373 is handled by the package manager.
9374 * Renaming crate imports are now written `extern crate foo as bar`
9375 instead of `extern crate bar = foo`.
9376 * Renaming use statements are now written `use foo as bar` instead
9378 * `let` and `match` bindings and argument names in macros are now
9380 * The new, more efficient, closure types ('unboxed closures') have
9381 been added under a feature gate, 'unboxed_closures'. These will
9382 soon replace the existing closure types, once higher-ranked
9383 trait lifetimes are added to the language.
9384 * `move` has been added as a keyword, for indicating closures
9385 that capture by value.
9386 * Mutation and assignment is no longer allowed in pattern guards.
9387 * Generic structs and enums can now have trait bounds.
9388 * The `Share` trait is now called `Sync` to free up the term
9389 'shared' to refer to 'shared reference' (the default reference
9391 * Dynamically-sized types have been mostly implemented,
9392 unifying the behavior of fat-pointer types with the rest of the
9394 * As part of dynamically-sized types, the `Sized` trait has been
9395 introduced, which qualifying types implement by default, and
9396 which type parameters expect by default. To specify that a type
9397 parameter does not need to be sized, write `<Sized? T>`. Most
9398 types are `Sized`, notable exceptions being unsized arrays
9399 (`[T]`) and trait types.
9400 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9401 * Lifetime bounds can now be applied to type parameters and object
9403 * The old, reference counted GC type, `Gc<T>` which was once
9404 denoted by the `@` sigil, has finally been removed. GC will be
9405 revisited in the future.
9408 * Library documentation has been improved for a number of modules.
9409 * Bit-vectors, collections::bitv has been modernized.
9410 * The url crate is deprecated in favor of
9411 http://github.com/servo/rust-url, which can be installed with
9413 * Most I/O stream types can be cloned and subsequently closed from
9415 * A `std::time::Duration` type has been added for use in I/O
9416 methods that rely on timers, as well as in the 'time' crate's
9417 `Timespec` arithmetic.
9418 * The runtime I/O abstraction layer that enabled the green thread
9419 scheduler to do non-thread-blocking I/O has been removed, along
9420 with the libuv-based implementation employed by the green thread
9421 scheduler. This will greatly simplify the future I/O work.
9422 * `collections::btree` has been rewritten to have a more
9423 idiomatic and efficient design.
9426 * rustdoc output now indicates the stability levels of API's.
9427 * The `--crate-name` flag can specify the name of the crate
9428 being compiled, like `#[crate_name]`.
9429 * The `-C metadata` specifies additional metadata to hash into
9430 symbol names, and `-C extra-filename` specifies additional
9431 information to put into the output filename, for use by the
9432 package manager for versioning.
9433 * debug info generation has continued to improve and should be
9434 more reliable under both gdb and lldb.
9435 * rustc has experimental support for compiling in parallel
9436 using the `-C codegen-units` flag.
9437 * rustc no longer encodes rpath information into binaries by
9441 * Stack usage has been optimized with LLVM lifetime annotations.
9442 * Official Rust binaries on Linux are more compatible with older
9443 kernels and distributions, built on CentOS 5.10.
9446 Version 0.11.0 (2014-07-02)
9447 ==========================
9449 * ~1700 changes, numerous bugfixes
9452 * ~[T] has been removed from the language. This type is superseded by
9454 * ~str has been removed from the language. This type is superseded by
9456 * ~T has been removed from the language. This type is superseded by the
9458 * @T has been removed from the language. This type is superseded by the
9459 standard library's std::gc::Gc<T> type.
9460 * Struct fields are now all private by default.
9461 * Vector indices and shift amounts are both required to be a `uint`
9462 instead of any integral type.
9463 * Byte character, byte string, and raw byte string literals are now all
9464 supported by prefixing the normal literal with a `b`.
9465 * Multiple ABIs are no longer allowed in an ABI string
9466 * The syntax for lifetimes on closures/procedures has been tweaked
9467 slightly: `<'a>|A, B|: 'b + K -> T`
9468 * Floating point modulus has been removed from the language; however it
9469 is still provided by a library implementation.
9470 * Private enum variants are now disallowed.
9471 * The `priv` keyword has been removed from the language.
9472 * A closure can no longer be invoked through a &-pointer.
9473 * The `use foo, bar, baz;` syntax has been removed from the language.
9474 * The transmute intrinsic no longer works on type parameters.
9475 * Statics now allow blocks/items in their definition.
9476 * Trait bounds are separated from objects with + instead of : now.
9477 * Objects can no longer be read while they are mutably borrowed.
9478 * The address of a static is now marked as insignificant unless the
9479 #[inline(never)] attribute is placed it.
9480 * The #[unsafe_destructor] attribute is now behind a feature gate.
9481 * Struct literals are no longer allowed in ambiguous positions such as
9482 if, while, match, and for..in.
9483 * Declaration of lang items and intrinsics are now feature-gated by
9485 * Integral literals no longer default to `int`, and floating point
9486 literals no longer default to `f64`. Literals must be suffixed with an
9487 appropriate type if inference cannot determine the type of the
9489 * The Box<T> type is no longer implicitly borrowed to &mut T.
9490 * Procedures are now required to not capture borrowed references.
9493 * The standard library is now a "facade" over a number of underlying
9494 libraries. This means that development on the standard library should
9495 be speedier due to smaller crates, as well as a clearer line between
9497 * A new library, libcore, lives under the standard library's facade
9498 which is Rust's "0-assumption" library, suitable for embedded and
9499 kernel development for example.
9500 * A regex crate has been added to the standard distribution. This crate
9501 includes statically compiled regular expressions.
9502 * The unwrap/unwrap_err methods on Result require a Show bound for
9503 better error messages.
9504 * The return types of the std::comm primitives have been centralized
9505 around the Result type.
9506 * A number of I/O primitives have gained the ability to time out their
9508 * A number of I/O primitives have gained the ability to close their
9509 reading/writing halves to cancel pending operations.
9510 * Reverse iterator methods have been removed in favor of `rev()` on
9511 their forward-iteration counterparts.
9512 * A bitflags! macro has been added to enable easy interop with C and
9513 management of bit flags.
9514 * A debug_assert! macro is now provided which is disabled when
9515 `--cfg ndebug` is passed to the compiler.
9516 * A graphviz crate has been added for creating .dot files.
9517 * The std::cast module has been migrated into std::mem.
9518 * The std::local_data api has been migrated from freestanding functions
9519 to being based on methods.
9520 * The Pod trait has been renamed to Copy.
9521 * jemalloc has been added as the default allocator for types.
9522 * The API for allocating memory has been changed to use proper alignment
9523 and sized deallocation
9524 * Connecting a TcpStream or binding a TcpListener is now based on a
9525 string address and a u16 port. This allows connecting to a hostname as
9527 * The Reader trait now contains a core method, read_at_least(), which
9528 correctly handles many repeated 0-length reads.
9529 * The process-spawning API is now centered around a builder-style
9531 * The :? printing qualifier has been moved from the standard library to
9532 an external libdebug crate.
9533 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9534 have been renamed to Eq/Ord.
9535 * The select/plural methods have been removed from format!. The escapes
9536 for { and } have also changed from \{ and \} to {{ and }},
9538 * The TaskBuilder API has been re-worked to be a true builder, and
9539 extension traits for spawning native/green tasks have been added.
9542 * All breaking changes to the language or libraries now have their
9543 commit message annotated with `[breaking-change]` to allow for easy
9544 discovery of breaking changes.
9545 * The compiler will now try to suggest how to annotate lifetimes if a
9546 lifetime-related error occurs.
9547 * Debug info continues to be improved greatly with general bug fixes and
9548 better support for situations like link time optimization (LTO).
9549 * Usage of syntax extensions when cross-compiling has been fixed.
9550 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9551 -fdata-sections and --gc-sections has been enabled by default
9552 * The compiler is now stricter about where it will load module files
9553 from when a module is declared via `mod foo;`.
9554 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9555 Syntax extensions are now discovered via a "plugin registrar" type
9556 which will be extended in the future to other various plugins.
9557 * Lints have been restructured to allow for dynamically loadable lints.
9558 * A number of rustdoc improvements:
9559 * The HTML output has been visually redesigned.
9560 * Markdown is now powered by hoedown instead of sundown.
9561 * Searching heuristics have been greatly improved.
9562 * The search index has been reduced in size by a great amount.
9563 * Cross-crate documentation via `pub use` has been greatly improved.
9564 * Primitive types are now hyperlinked and documented.
9565 * Documentation has been moved from static.rust-lang.org/doc to
9567 * A new sandbox, play.rust-lang.org, is available for running and
9568 sharing rust code examples on-line.
9569 * Unused attributes are now more robustly warned about.
9570 * The dead_code lint now warns about unused struct fields.
9571 * Cross-compiling to iOS is now supported.
9572 * Cross-compiling to mipsel is now supported.
9573 * Stability attributes are now inherited by default and no longer apply
9574 to intra-crate usage, only inter-crate usage.
9575 * Error message related to non-exhaustive match expressions have been
9579 Version 0.10 (2014-04-03)
9580 =========================
9582 * ~1500 changes, numerous bugfixes
9585 * A new RFC process is now in place for modifying the language.
9586 * Patterns with `@`-pointers have been removed from the language.
9587 * Patterns with unique vectors (`~[T]`) have been removed from the
9589 * Patterns with unique strings (`~str`) have been removed from the
9591 * `@str` has been removed from the language.
9592 * `@[T]` has been removed from the language.
9593 * `@self` has been removed from the language.
9594 * `@Trait` has been removed from the language.
9595 * Headers on `~` allocations which contain `@` boxes inside the type for
9596 reference counting have been removed.
9597 * The semantics around the lifetimes of temporary expressions have changed,
9598 see #3511 and #11585 for more information.
9599 * Cross-crate syntax extensions are now possible, but feature gated. See
9600 #11151 for more information. This includes both `macro_rules!` macros as
9601 well as syntax extensions such as `format!`.
9602 * New lint modes have been added, and older ones have been turned on to be
9604 * Unnecessary parentheses
9607 * Uppercase variables
9608 * Publicly visible private types
9609 * `#[deriving]` with raw pointers
9610 * Unsafe functions can no longer be coerced to closures.
9611 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9612 * The `#[simd]` attribute is now behind a feature gate.
9613 * Visibility is no longer allowed on `extern crate` statements, and
9614 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9615 * Trailing commas are now allowed in argument lists and tuple patterns.
9616 * The `do` keyword has been removed, it is now a reserved keyword.
9617 * Default type parameters have been implemented, but are feature gated.
9618 * Borrowed variables through captures in closures are now considered soundly.
9619 * `extern mod` is now `extern crate`
9620 * The `Freeze` trait has been removed.
9621 * The `Share` trait has been added for types that can be shared among
9623 * Labels in macros are now hygienic.
9624 * Expression/statement macro invocations can be delimited with `{}` now.
9625 * Treatment of types allowed in `static mut` locations has been tweaked.
9626 * The `*` and `.` operators are now overloadable through the `Deref` and
9628 * `~Trait` and `proc` no longer have `Send` bounds by default.
9629 * Partial type hints are now supported with the `_` type marker.
9630 * An `Unsafe` type was introduced for interior mutability. It is now
9631 considered undefined to transmute from `&T` to `&mut T` without using the
9633 * The #[linkage] attribute was implemented for extern statics/functions.
9634 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9635 * `Pod` was renamed to `Copy`.
9638 * The `libextra` library has been removed. It has now been decomposed into
9639 component libraries with smaller and more focused nuggets of
9640 functionality. The full list of libraries can be found on the
9641 documentation index page.
9642 * std: `std::condition` has been removed. All I/O errors are now propagated
9643 through the `Result` type. In order to assist with error handling, a
9644 `try!` macro for unwrapping errors with an early return and a lint for
9645 unused results has been added. See #12039 for more information.
9646 * std: The `vec` module has been renamed to `slice`.
9647 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9648 This will become the only growable vector in the future.
9649 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9650 are now found at `std::io::BufferedReader` instead of
9651 `std::io::buffered::BufferedReader`.
9652 * std: `print` and `println` are no longer in the prelude, the `print!` and
9653 `println!` macros are intended to be used instead.
9654 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9655 attempts to statically prevent cycles.
9656 * std: The standard distribution is adopting the policy of pushing failure
9657 to the user rather than failing in libraries. Many functions (such as
9658 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9659 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9660 deriving mode: `#[deriving(Show)]`.
9661 * std: `ToStr` is now implemented for all types implementing `Show`.
9662 * std: The formatting trait methods now take `&self` instead of `&T`
9663 * std: The `invert()` method on iterators has been renamed to `rev()`
9664 * std: `std::num` has seen a reduction in the genericity of its traits,
9665 consolidating functionality into a few core traits.
9666 * std: Backtraces are now printed on task failure if the environment
9667 variable `RUST_BACKTRACE` is present.
9668 * std: Naming conventions for iterators have been standardized. More details
9669 can be found on the wiki's style guide.
9670 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9671 still implement the function.
9672 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9673 * std: `assert_approx_eq!` has been removed
9674 * std: The `e` and `E` formatting specifiers for floats have been added to
9675 print them in exponential notation.
9676 * std: The `Times` trait has been removed
9677 * std: Indications of variance and opting out of builtin bounds is done
9678 through marker types in `std::kinds::marker` now
9679 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9680 `#[deriving(Hash)]` is now possible.
9681 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9682 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9683 * std: `Chan::new` is now `channel()`.
9684 * std: A new synchronous channel type has been implemented.
9685 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9686 * std: `hashmap` and `trie` have been moved to `libcollections`
9687 * std: `run` has been rolled into `io::process`
9688 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9689 * std: The equality and comparison traits have seen some reorganization.
9690 * std: `rand` has moved to `librand`.
9691 * std: `to_{lower,upper}case` has been implemented for `char`.
9692 * std: Logging has been moved to `liblog`.
9693 * collections: `HashMap` has been rewritten for higher performance and less
9695 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9696 it can be booted manually. The runtime guide has more information and
9698 * native: All I/O functionality except signals has been implemented.
9699 * green: Task spawning with `libgreen` has been optimized with stack caching
9700 and various trimming of code.
9701 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9702 * sync: The `extra::sync` module has been updated to modern rust (and moved
9703 to the `sync` library), tweaking and improving various interfaces while
9704 dropping redundant functionality.
9705 * sync: A new `Barrier` type has been added to the `sync` library.
9706 * sync: An efficient mutex for native and green tasks has been implemented.
9707 * serialize: The `base64` module has seen some improvement. It treats
9708 newlines better, has non-string error values, and has seen general
9710 * fourcc: A `fourcc!` macro was introduced
9711 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9712 hexadecimal literal.
9715 * `rustpkg` has been deprecated and removed from the main repository. Its
9716 replacement, `cargo`, is under development.
9717 * Nightly builds of rust are now available
9718 * The memory usage of rustc has been improved many times throughout this
9720 * The build process supports disabling rpath support for the rustc binary
9722 * Code generation has improved in some cases, giving more information to the
9723 LLVM optimization passes to enable more extensive optimizations.
9724 * Debuginfo compatibility with lldb on OSX has been restored.
9725 * The master branch is now gated on an android bot, making building for
9726 android much more reliable.
9727 * Output flags have been centralized into one `--emit` flag.
9728 * Crate type flags have been centralized into one `--crate-type` flag.
9729 * Codegen flags have been consolidated behind a `-C` flag.
9730 * Linking against outdated crates now has improved error messages.
9731 * Error messages with lifetimes will often suggest how to annotate the
9732 function to fix the error.
9733 * Many more types are documented in the standard library, and new guides
9735 * Many `rustdoc` improvements:
9736 * code blocks are syntax highlighted.
9737 * render standalone markdown files.
9738 * the --test flag tests all code blocks by default.
9739 * exported macros are displayed.
9740 * re-exported types have their documentation inlined at the location of the
9742 * search works across crates that have been rendered to the same output
9746 Version 0.9 (2014-01-09)
9747 ==========================
9749 * ~1800 changes, numerous bugfixes
9752 * The `float` type has been removed. Use `f32` or `f64` instead.
9753 * A new facility for enabling experimental features (feature gating) has
9754 been added, using the crate-level `#[feature(foo)]` attribute.
9755 * Managed boxes (@) are now behind a feature gate
9756 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9757 standard library's `Gc` or `Rc` types instead.
9758 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9759 * Jumping back to the top of a loop is now done with `continue` instead of
9761 * Strings can no longer be mutated through index assignment.
9762 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9763 hash delimiters, as in `r###"foo"###`.
9764 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9766 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9767 * `@fn`s have been removed.
9768 * `do` only works with procs in order to make it obvious what the cost
9770 * Single-element tuple-like structs can no longer be dereferenced to
9771 obtain the inner value. A more comprehensive solution for overloading
9772 the dereference operator will be provided in the future.
9773 * The `#[link(...)]` attribute has been replaced with
9774 `#[crate_id = "name#vers"]`.
9775 * Empty `impl`s must be terminated with empty braces and may not be
9776 terminated with a semicolon.
9777 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9778 no longer has any special meaning.
9779 * The old `fmt!` string formatting macro has been removed.
9780 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9781 `print!` and `println!`.
9782 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9783 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9784 `extern mod foo = "bar"` instead.
9785 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9786 * Macros can have attributes.
9787 * Macros can expand to items with attributes.
9788 * Macros can expand to multiple items.
9789 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9790 * Comments may be nested.
9791 * Values automatically coerce to trait objects they implement, without
9793 * Enum discriminants are no longer an entire word but as small as needed to
9794 contain all the variants. The `repr` attribute can be used to override
9795 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9796 `#[repr(C)]` to match C enums.
9797 * Non-string literals are not allowed in attributes (they never worked).
9798 * The FFI now supports variadic functions.
9799 * Octal numeric literals, as in `0o7777`.
9800 * The `concat!` syntax extension performs compile-time string concatenation.
9801 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9802 removed as Rust no longer uses segmented stacks.
9803 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9804 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9805 not `*`; ignoring remaining fields of a struct is also done with `..`,
9806 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9807 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9808 * `rustc` supports the "system" calling convention, which defaults to the
9809 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9811 * The `type_overflow` lint (default: warn) checks literals for overflow.
9812 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9813 * The `attribute_usage` lint (default: warn) warns about unknown
9815 * The `unknown_features` lint (default: warn) warns about unknown
9817 * The `dead_code` lint (default: warn) checks for dead code.
9818 * Rust libraries can be linked statically to one another
9819 * `#[link_args]` is behind the `link_args` feature gate.
9820 * Native libraries are now linked with `#[link(name = "foo")]`
9821 * Native libraries can be statically linked to a rust crate
9822 (`#[link(name = "foo", kind = "static")]`).
9823 * Native OS X frameworks are now officially supported
9824 (`#[link(name = "foo", kind = "framework")]`).
9825 * The `#[thread_local]` attribute creates thread-local (not task-local)
9826 variables. Currently behind the `thread_local` feature gate.
9827 * The `return` keyword may be used in closures.
9828 * Types that can be copied via a memcpy implement the `Pod` kind.
9829 * The `cfg` attribute can now be used on struct fields and enum variants.
9832 * std: The `option` and `result` API's have been overhauled to make them
9833 simpler, more consistent, and more composable.
9834 * std: The entire `std::io` module has been replaced with one that is
9835 more comprehensive and that properly interfaces with the underlying
9836 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9838 * std: `io::util` contains a number of useful implementations of
9839 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9840 `ZeroReader`, `TeeReader`.
9841 * std: The reference counted pointer type `extra::rc` moved into std.
9842 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9843 just a wrapper around it).
9844 * std: The `Either` type has been removed.
9845 * std: `fmt::Default` can be implemented for any type to provide default
9846 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9847 * std: The `rand` API continues to be tweaked.
9848 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9849 on failure in gdb, is now named `rust_fail`.
9850 * std: The `each_key` and `each_value` methods on `HashMap` have been
9851 replaced by the `keys` and `values` iterators.
9852 * std: Functions dealing with type size and alignment have moved from the
9853 `sys` module to the `mem` module.
9854 * std: The `path` module was written and API changed.
9855 * std: `str::from_utf8` has been changed to cast instead of allocate.
9856 * std: `starts_with` and `ends_with` methods added to vectors via the
9857 `ImmutableEqVector` trait, which is in the prelude.
9858 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9859 if the index is out of bounds.
9860 * std: Task failure no longer propagates between tasks, as the model was
9861 complex, expensive, and incompatible with thread-based tasks.
9862 * std: The `Any` type can be used for dynamic typing.
9863 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9865 * std: Methods that produce iterators generally do not have an `_iter`
9867 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9868 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9869 * std: `util::ignore` renamed to `prelude::drop`.
9870 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9872 * std: `vec::raw` has seen a lot of cleanup and API changes.
9873 * std: The standard library no longer includes any C++ code, and very
9874 minimal C, eliminating the dependency on libstdc++.
9875 * std: Runtime scheduling and I/O functionality has been factored out into
9876 extensible interfaces and is now implemented by two different crates:
9877 libnative, for native threading and I/O; and libgreen, for green threading
9878 and I/O. This paves the way for using the standard library in more limited
9879 embedded environments.
9880 * std: The `comm` module has been rewritten to be much faster, have a
9881 simpler, more consistent API, and to work for both native and green
9883 * std: All libuv dependencies have been moved into the rustuv crate.
9884 * native: New implementations of runtime scheduling on top of OS threads.
9885 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9887 * green: The green thread scheduler and message passing types are almost
9889 * extra: The `flatpipes` module had bitrotted and was removed.
9890 * extra: All crypto functions have been removed and Rust now has a policy of
9891 not reimplementing crypto in the standard library. In the future crypto
9892 will be provided by external crates with bindings to established libraries.
9893 * extra: `c_vec` has been modernized.
9894 * extra: The `sort` module has been removed. Use the `sort` method on
9898 * The `rust` and `rusti` commands have been removed, due to lack of
9900 * `rustdoc` was completely rewritten.
9901 * `rustdoc` can test code examples in documentation.
9902 * `rustpkg` can test packages with the argument, 'test'.
9903 * `rustpkg` supports arbitrary dependencies, including C libraries.
9904 * `rustc`'s support for generating debug info is improved again.
9905 * `rustc` has better error reporting for unbalanced delimiters.
9906 * `rustc`'s JIT support was removed due to bitrot.
9907 * Executables and static libraries can be built with LTO (-Z lto)
9908 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9912 Version 0.8 (2013-09-26)
9913 ============================
9915 * ~2200 changes, numerous bugfixes
9918 * The `for` loop syntax has changed to work with the `Iterator` trait.
9919 * At long last, unwinding works on Windows.
9920 * Default methods are ready for use.
9921 * Many trait inheritance bugs fixed.
9922 * Owned and borrowed trait objects work more reliably.
9923 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9924 * rustc can omit emission of code for the `debug!` macro if it is passed
9926 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9927 for foo.rs, then foo/mod.rs, and will generate an error when both are
9929 * Strings no longer contain trailing nulls. The new `std::c_str` module
9930 provides new mechanisms for converting to C strings.
9931 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9932 * The FFI has been overhauled such that foreign functions are called directly,
9933 instead of through a stack-switching wrapper.
9934 * Calling a foreign function must be done through a Rust function with the
9935 `#[fixed_stack_segment]` attribute.
9936 * The `externfn!` macro can be used to declare both a foreign function and
9937 a `#[fixed_stack_segment]` wrapper at once.
9938 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9939 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9940 * `priv` is disallowed everywhere except for struct fields and enum variants.
9941 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9942 * `ref` bindings in irrefutable patterns work correctly now.
9943 * `char` is now prevented from containing invalid code points.
9944 * Casting to `bool` is no longer allowed.
9945 * `\0` is now accepted as an escape in chars and strings.
9946 * `yield` is a reserved keyword.
9947 * `typeof` is a reserved keyword.
9948 * Crates may be imported by URL with `extern mod foo = "url";`.
9949 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9950 * Static vectors can be initialized with repeating elements,
9951 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9952 * Static structs can be initialized with functional record update,
9953 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9954 * `cfg!` can be used to conditionally execute code based on the crate
9955 configuration, similarly to `#[cfg(...)]`.
9956 * The `unnecessary_qualification` lint detects unneeded module
9957 prefixes (default: allow).
9958 * Arithmetic operations have been implemented on the SIMD types in
9959 `std::unstable::simd`.
9960 * Exchange allocation headers were removed, reducing memory usage.
9961 * `format!` implements a completely new, extensible, and higher-performance
9962 string formatting system. It will replace `fmt!`.
9963 * `print!` and `println!` write formatted strings (using the `format!`
9964 extension) to stdout.
9965 * `write!` and `writeln!` write formatted strings (using the `format!`
9966 extension) to the new Writers in `std::rt::io`.
9967 * The library section in which a function or static is placed may
9968 be specified with `#[link_section = "..."]`.
9969 * The `proto!` syntax extension for defining bounded message protocols
9971 * `macro_rules!` is hygienic for `let` declarations.
9972 * The `#[export_name]` attribute specifies the name of a symbol.
9973 * `unreachable!` can be used to indicate unreachable code, and fails
9977 * std: Transitioned to the new runtime, written in Rust.
9978 * std: Added an experimental I/O library, `rt::io`, based on the new
9980 * std: A new generic `range` function was added to the prelude, replacing
9981 `uint::range` and friends.
9982 * std: `range_rev` no longer exists. Since range is an iterator it can be
9983 reversed with `range(lo, hi).invert()`.
9984 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9985 renamed to `unwrap_or`.
9986 * std: The `iterator` module was renamed to `iter`.
9987 * std: Integral types now support the `checked_add`, `checked_sub`, and
9988 `checked_mul` operations for detecting overflow.
9989 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9991 * std: Methods are standardizing on conventions for casting methods:
9992 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9994 * std: The `CString` type in `c_str` provides new ways to convert to and
9996 * std: `DoubleEndedIterator` can yield elements in two directions.
9997 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9999 * std: `str::from_bytes` renamed to `str::from_utf8`.
10000 * std: `pop_opt` and `shift_opt` methods added to vectors.
10001 * std: The task-local data interface no longer uses @, and keys are
10002 no longer function pointers.
10003 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10004 * std: Added `SharedPort` to `comm`.
10005 * std: `Eq` has a default method for `ne`; only `eq` is required
10006 in implementations.
10007 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10008 is required in implementations.
10009 * std: `is_utf8` performance is improved, impacting many string functions.
10010 * std: `os::MemoryMap` provides cross-platform mmap.
10011 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10012 are not 'in-bounds' are considered undefined.
10013 * std: Many freestanding functions in `vec` removed in favor of methods.
10014 * std: Many freestanding functions on scalar types removed in favor of
10016 * std: Many options to task builders were removed since they don't make
10017 sense in the new scheduler design.
10018 * std: More containers implement `FromIterator` so can be created by the
10020 * std: More complete atomic types in `unstable::atomics`.
10021 * std: `comm::PortSet` removed.
10022 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10023 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10024 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10025 default implementations.
10026 * std: Various `from_str` functions were removed in favor of a generic
10027 `from_str` which is available in the prelude.
10028 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10029 * extra: `dlist`, the doubly-linked list was modernized.
10030 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10031 * extra: Added `glob` module, replacing `std::os::glob`.
10032 * extra: `rope` was removed.
10033 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10034 * extra: `net`, and `timer` were removed. The experimental replacements
10035 are `std::rt::io::net` and `std::rt::io::timer`.
10036 * extra: Iterators implemented for `SmallIntMap`.
10037 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10038 * extra: `SmallIntSet` removed. Use `BitvSet`.
10039 * extra: Performance of JSON parsing greatly improved.
10040 * extra: `semver` updated to SemVer 2.0.0.
10041 * extra: `term` handles more terminals correctly.
10042 * extra: `dbg` module removed.
10043 * extra: `par` module removed.
10044 * extra: `future` was cleaned up, with some method renames.
10045 * extra: Most free functions in `getopts` were converted to methods.
10048 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10049 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10050 similarly to gcc's `--march` flag.
10051 * rustc's performance compiling small crates is much better.
10052 * rustpkg has received many improvements.
10053 * rustpkg supports git tags as package IDs.
10054 * rustpkg builds into target-specific directories so it can be used for
10056 * The number of concurrent test tasks is controlled by the environment
10057 variable RUST_TEST_TASKS.
10058 * The test harness can now report metrics for benchmarks.
10059 * All tools have man pages.
10060 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10061 * The runtime uses jemalloc for allocations.
10062 * Segmented stacks are temporarily disabled as part of the transition to
10063 the new runtime. Stack overflows are possible!
10064 * A new documentation backend, rustdoc_ng, is available for use. It is
10065 still invoked through the normal `rustdoc` command.
10068 Version 0.7 (2013-07-03)
10069 =======================
10071 * ~2000 changes, numerous bugfixes
10074 * `impl`s no longer accept a visibility qualifier. Put them on methods
10076 * The borrow checker has been rewritten with flow-sensitivity, fixing
10077 many bugs and inconveniences.
10078 * The `self` parameter no longer implicitly means `&'self self`,
10079 and can be explicitly marked with a lifetime.
10080 * Overloadable compound operators (`+=`, etc.) have been temporarily
10081 removed due to bugs.
10082 * The `for` loop protocol now requires `for`-iterators to return `bool`
10083 so they compose better.
10084 * The `Durable` trait is replaced with the `'static` bounds.
10085 * Trait default methods work more often.
10086 * Structs with the `#[packed]` attribute have byte alignment and
10087 no padding between fields.
10088 * Type parameters bound by `Copy` must now be copied explicitly with
10089 the `copy` keyword.
10090 * It is now illegal to move out of a dereferenced unsafe pointer.
10091 * `Option<~T>` is now represented as a nullable pointer.
10092 * `@mut` does dynamic borrow checks correctly.
10093 * The `main` function is only detected at the topmost level of the crate.
10094 The `#[main]` attribute is still valid anywhere.
10095 * Struct fields may no longer be mutable. Use inherited mutability.
10096 * The `#[no_send]` attribute makes a type that would otherwise be
10098 * The `#[no_freeze]` attribute makes a type that would otherwise be
10100 * Unbounded recursion will abort the process after reaching the limit
10101 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10102 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10103 are never implicitly copyable.
10104 * `#[static_assert]` makes compile-time assertions about static bools.
10105 * At long last, 'argument modes' no longer exist.
10106 * The rarely used `use mod` statement no longer exists.
10108 * Syntax extensions
10109 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10111 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10112 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10113 `#[deriving(...)]`.
10114 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10115 and unsuffixed integer literals.
10118 * The `core` crate was renamed to `std`.
10119 * The `std` crate was renamed to `extra`.
10120 * More and improved documentation.
10121 * std: `iterator` module for external iterator objects.
10122 * Many old-style (internal, higher-order function) iterators replaced by
10123 implementations of `Iterator`.
10124 * std: Many old internal vector and string iterators,
10125 incl. `any`, `all`. removed.
10126 * std: The `finalize` method of `Drop` renamed to `drop`.
10127 * std: The `drop` method now takes `&mut self` instead of `&self`.
10128 * std: The prelude no longer re-exports any modules, only types and traits.
10129 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10130 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10131 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10132 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10133 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10134 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10135 * std: Many types implement `Clone`.
10136 * std: `path` type renamed to `Path`.
10137 * std: `mut` module and `Mut` type removed.
10138 * std: Many standalone functions removed in favor of methods and iterators
10139 in `vec`, `str`. In the future methods will also work as functions.
10140 * std: `reinterpret_cast` removed. Use `transmute`.
10141 * std: ascii string handling in `std::ascii`.
10142 * std: `Rand` is implemented for ~/@.
10143 * std: `run` module for spawning processes overhauled.
10144 * std: Various atomic types added to `unstable::atomic`.
10145 * std: Various types implement `Zero`.
10146 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10147 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10148 * std: Added `os::mkdir_recursive`.
10149 * std: Added `os::glob` function performs filesystems globs.
10150 * std: `FuzzyEq` renamed to `ApproxEq`.
10151 * std: `Map` now defines `pop` and `swap` methods.
10152 * std: `Cell` constructors converted to static methods.
10153 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10154 * extra: `flate` module moved from `std` to `extra`.
10155 * extra: `fileinput` module for iterating over a series of files.
10156 * extra: `Complex` number type and `complex` module.
10157 * extra: `Rational` number type and `rational` module.
10158 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10159 * extra: `term` uses terminfo now, is more correct.
10160 * extra: `arc` functions converted to methods.
10161 * extra: Implementation of fixed output size variations of SHA-2.
10164 * `unused_variables` lint mode for unused variables (default: warn).
10165 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10167 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10169 * `dead_assignment` lint mode for unread variables (default: warn).
10170 * `unnecessary_allocation` lint mode detects some heap allocations that are
10171 immediately borrowed so could be written without allocating (default: warn).
10172 * `missing_doc` lint mode (default: allow).
10173 * `unreachable_code` lint mode (default: warn).
10174 * The `rusti` command has been rewritten and a number of bugs addressed.
10175 * rustc outputs in color on more terminals.
10176 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10177 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10178 * Compiling with `-g` will make the binary record information about
10179 dynamic borrowcheck failures for debugging.
10180 * rustdoc has a nicer stylesheet.
10181 * Various improvements to rustdoc.
10182 * Improvements to rustpkg (see the detailed release notes).
10185 Version 0.6 (2013-04-03)
10186 ========================
10188 * ~2100 changes, numerous bugfixes
10191 * The self type parameter in traits is now spelled `Self`
10192 * The `self` parameter in trait and impl methods must now be explicitly
10193 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10194 * Static methods no longer require the `static` keyword and instead
10195 are distinguished by the lack of a `self` parameter
10196 * Replaced the `Durable` trait with the `'static` lifetime
10197 * The old closure type syntax with the trailing sigil has been
10198 removed in favor of the more consistent leading sigil
10199 * `super` is a keyword, and may be prefixed to paths
10200 * Trait bounds are separated with `+` instead of whitespace
10201 * Traits are implemented with `impl Trait for Type`
10202 instead of `impl Type: Trait`
10203 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10204 * The `export` keyword has finally been removed
10205 * The `move` keyword has been removed (see "Semantic changes")
10206 * The interior mutability qualifier on vectors, `[mut T]`, has been
10207 removed. Use `&mut [T]`, etc.
10208 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10209 * `fail` is no longer a keyword. Use `fail!()`
10210 * `assert` is no longer a keyword. Use `assert!()`
10211 * `log` is no longer a keyword. use `debug!`, etc.
10212 * 1-tuples may be represented as `(T,)`
10213 * Struct fields may no longer be `mut`. Use inherited mutability,
10214 `@mut T`, `core::mut` or `core::cell`
10215 * `extern mod { ... }` is no longer valid syntax for foreign
10216 function modules. Use extern blocks: `extern { ... }`
10217 * Newtype enums removed. Use tuple-structs.
10218 * Trait implementations no longer support visibility modifiers
10219 * Pattern matching over vectors improved and expanded
10220 * `const` renamed to `static` to correspond to lifetime name,
10221 and make room for future `static mut` unsafe mutable globals.
10222 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10223 * `Clone` implementations can be automatically generated with
10224 `#[deriving(Clone)]`
10225 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10226 instead of `foo as Bar`.
10227 * Fixed length vector types are now written as `[int, .. 3]`
10228 instead of `[int * 3]`.
10229 * Fixed length vector types can express the length as a constant
10230 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10233 * Types with owned pointers or custom destructors move by default,
10234 eliminating the `move` keyword
10235 * All foreign functions are considered unsafe
10236 * &mut is now unaliasable
10237 * Writes to borrowed @mut pointers are prevented dynamically
10239 * The name of the main function can be customized using #[main]
10240 * The default type of an inferred closure is &fn instead of @fn
10241 * `use` statements may no longer be "chained" - they cannot import
10242 identifiers imported by previous `use` statements
10243 * `use` statements are crate relative, importing from the "top"
10244 of the crate by default. Paths may be prefixed with `super::`
10245 or `self::` to change the search behavior.
10246 * Method visibility is inherited from the implementation declaration
10247 * Structural records have been removed
10248 * Many more types can be used in static items, including enums
10249 'static-lifetime pointers and vectors
10250 * Pattern matching over vectors improved and expanded
10251 * Typechecking of closure types has been overhauled to
10252 improve inference and eliminate unsoundness
10253 * Macros leave scope at the end of modules, unless that module is
10254 tagged with #[macro_escape]
10257 * Added big integers to `std::bigint`
10258 * Removed `core::oldcomm` module
10259 * Added pipe-based `core::comm` module
10260 * Numeric traits have been reorganized under `core::num`
10261 * `vec::slice` finally returns a slice
10262 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10263 * Containers reorganized around traits in `core::container`
10264 * `core::dvec` removed, `~[T]` is a drop-in replacement
10265 * `core::send_map` renamed to `core::hashmap`
10266 * `std::map` removed; replaced with `core::hashmap`
10267 * `std::treemap` reimplemented as an owned balanced tree
10268 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10269 * `core::trie` added as a fast ordered map for integer keys
10270 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10271 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10272 overload the comparison operators, whereas `TotalOrd` is used
10273 by certain container types
10276 * Replaced the 'cargo' package manager with 'rustpkg'
10277 * Added all-purpose 'rust' tool
10278 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10279 * rustc now *attempts* to offer spelling suggestions
10280 * Improved support for ARM and Android
10281 * Preliminary MIPS backend
10282 * Improved foreign function ABI implementation for x86, x86_64
10283 * Various memory usage improvements
10284 * Rust code may be embedded in foreign code under limited circumstances
10285 * Inline assembler supported by new asm!() syntax extension.
10288 Version 0.5 (2012-12-21)
10289 ===========================
10291 * ~900 changes, numerous bugfixes
10294 * Removed `<-` move operator
10295 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10296 * Removed old fixed length vector syntax - `[T]/N`
10297 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10298 * Macros may now expand to items and statements
10299 * `a.b()` is always parsed as a method call, never as a field projection
10300 * `Eq` and `IterBytes` implementations can be automatically generated
10301 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10302 * Removed the special crate language for `.rc` files
10303 * Function arguments may consist of any irrefutable pattern
10306 * `&` and `~` pointers may point to objects
10307 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10308 * Enum variants may be structs
10309 * Destructors can be added to all nominal types with the Drop trait
10310 * Structs and nullary enum variants may be constants
10311 * Values that cannot be implicitly copied are now automatically moved
10312 without writing `move` explicitly
10313 * `&T` may now be coerced to `*T`
10314 * Coercions happen in `let` statements as well as function calls
10315 * `use` statements now take crate-relative paths
10316 * The module and type namespaces have been merged so that static
10317 method names can be resolved under the trait in which they are
10320 * Improved support for language features
10321 * Trait inheritance works in many scenarios
10322 * More support for explicit self arguments in methods - `self`, `&self`
10323 `@self`, and `~self` all generally work as expected
10324 * Static methods work in more situations
10325 * Experimental: Traits may declare default methods for the implementations
10329 * New condition handling system in `core::condition`
10330 * Timsort added to `std::sort`
10331 * New priority queue, `std::priority_queue`
10332 * Pipes for serializable types, `std::flatpipes'
10333 * Serialization overhauled to be trait-based
10334 * Expanded `getopts` definitions
10335 * Moved futures to `std`
10336 * More functions are pure now
10337 * `core::comm` renamed to `oldcomm`. Still deprecated
10338 * `rustdoc` and `cargo` are libraries now
10341 * Added a preliminary REPL, `rusti`
10342 * License changed from MIT to dual MIT/APL2
10345 Version 0.4 (2012-10-15)
10346 ==========================
10348 * ~2000 changes, numerous bugfixes
10351 * All keywords are now strict and may not be used as identifiers anywhere
10352 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10353 'of', 'with', 'to', 'class'.
10354 * Classes are replaced with simpler structs
10355 * Explicit method self types
10356 * `ret` became `return` and `alt` became `match`
10357 * `import` is now `use`; `use is now `extern mod`
10358 * `extern mod { ... }` is now `extern { ... }`
10359 * `use mod` is the recommended way to import modules
10360 * `pub` and `priv` replace deprecated export lists
10361 * The syntax of `match` pattern arms now uses fat arrow (=>)
10362 * `main` no longer accepts an args vector; use `os::args` instead
10365 * Trait implementations are now coherent, ala Haskell typeclasses
10366 * Trait methods may be static
10367 * Argument modes are deprecated
10368 * Borrowed pointers are much more mature and recommended for use
10369 * Strings and vectors in the static region are stored in constant memory
10370 * Typestate was removed
10371 * Resolution rewritten to be more reliable
10372 * Support for 'dual-mode' data structures (freezing and thawing)
10375 * Most binary operators can now be overloaded via the traits in
10377 * `std::net::url` for representing URLs
10378 * Sendable hash maps in `core::send_map`
10379 * `core::task' gained a (currently unsafe) task-local storage API
10382 * An efficient new intertask communication primitive called the pipe,
10383 along with a number of higher-level channel types, in `core::pipes`
10384 * `std::arc`, an atomically reference counted, immutable, shared memory
10386 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10387 * Futures are now based on pipes and sendable
10388 * More robust linked task failure
10389 * Improved task builder API
10392 * Improved error reporting
10393 * Preliminary JIT support
10394 * Preliminary work on precise GC
10395 * Extensive architectural improvements to rustc
10396 * Begun a transition away from buggy C++-based reflection (shape) code to
10397 Rust-based (visitor) code
10398 * All hash functions and tables converted to secure, randomized SipHash
10401 Version 0.3 (2012-07-12)
10402 ========================
10404 * ~1900 changes, numerous bugfixes
10406 * New coding conveniences
10407 * Integer-literal suffix inference
10408 * Per-item control over warnings, errors
10409 * #[cfg(windows)] and #[cfg(unix)] attributes
10410 * Documentation comments
10411 * More compact closure syntax
10412 * 'do' expressions for treating higher-order functions as
10414 * *-patterns (wildcard extended to all constructor fields)
10417 * Name resolution pass and exhaustiveness checker rewritten
10418 * Region pointers and borrow checking supersede alias
10420 * Init-ness checking is now provided by a region-based liveness
10421 pass instead of the typestate pass; same for last-use analysis
10422 * Extensive work on region pointers
10424 * Experimental new language features
10425 * Slices and fixed-size, interior-allocated vectors
10426 * #!-comments for lang versioning, shell execution
10427 * Destructors and iface implementation for classes;
10428 type-parameterized classes and class methods
10429 * 'const' type kind for types that can be used to implement
10430 shared-memory concurrency patterns
10434 * Removal of various obsolete features
10435 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10436 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10438 * Constructs: do-while loops ('do' repurposed), fn binding,
10439 resources (replaced by destructors)
10441 * Compiler reorganization
10442 * Syntax-layer of compiler split into separate crate
10443 * Clang (from LLVM project) integrated into build
10444 * Typechecker split into sub-modules
10447 * New time functions
10448 * Extension methods for many built-in types
10449 * Arc: atomic-refcount read-only / exclusive-use shared cells
10450 * Par: parallel map and search routines
10451 * Extensive work on libuv interface
10452 * Much vector code moved to libraries
10453 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10454 #include, #include_str, #include_bin
10456 * Tool improvements
10457 * Cargo automatically resolves dependencies
10460 Version 0.2 (2012-03-29)
10461 =========================
10463 * >1500 changes, numerous bugfixes
10465 * New docs and doc tooling
10467 * New port: FreeBSD x86_64
10469 * Compilation model enhancements
10470 * Generics now specialized, multiply instantiated
10471 * Functions now inlined across separate crates
10473 * Scheduling, stack and threading fixes
10474 * Noticeably improved message-passing performance
10475 * Explicit schedulers
10479 * Experimental new language features
10480 * Operator overloading
10484 * Various language extensions
10485 * C-callback function types: 'crust fn ...'
10486 * Infinite-loop construct: 'loop { ... }'
10487 * Shorten 'mutable' to 'mut'
10488 * Required mutable-local qualifier: 'let mut ...'
10489 * Basic glob-exporting: 'export foo::*;'
10490 * Alt now exhaustive, 'alt check' for runtime-checked
10491 * Block-function form of 'for' loop, with 'break' and 'ret'.
10494 * AST quasi-quote syntax extension
10495 * Revived libuv interface
10496 * New modules: core::{future, iter}, std::arena
10497 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10498 * Extensive cleanup, regularization in libstd, libcore
10501 Version 0.1 (2012-01-20)
10502 ===============================
10504 * Most language features work, including:
10505 * Unique pointers, unique closures, move semantics
10506 * Interface-constrained generics
10507 * Static interface dispatch
10509 * Multithread task scheduling
10510 * Typestate predicates
10511 * Failure unwinding, destructors
10512 * Pattern matching and destructuring assignment
10513 * Lightweight block-lambda syntax
10514 * Preliminary macro-by-example
10516 * Compiler works with the following configurations:
10517 * Linux: x86 and x86_64 hosts and targets
10518 * macOS: x86 and x86_64 hosts and targets
10519 * Windows: x86 hosts and targets
10521 * Cross compilation / multi-target configuration supported.
10523 * Preliminary API-documentation and package-management tools included.
10527 * Documentation is incomplete.
10529 * Performance is below intended target.
10531 * Standard library APIs are subject to extensive change, reorganization.
10533 * Language-level versioning is not yet operational - future code will
10534 break unexpectedly.