1 Version 1.55.0 (2021-09-09)
2 ============================
6 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
7 will end at the maximum value of the integer.][83918]
8 - [You can now explicitly import the prelude of different editions
9 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
13 - [Added tier 3\* support for `powerpc-unknown-freebsd`.][87370]
14 - [Added tier 3 support for `powerpc64le-unknown-freebsd`.][83572]
16 \* Refer to Rust's [platform support page][platform-support-doc] for more
17 information on Rust's tiered platform support.
22 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
23 These improvements should in general provide faster string parsing of floats,
24 no longer reject certain valid floating point values, and reduce
25 the produced code size for non-stripped artifacts.
26 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
27 - [`collections::{BinaryHeap, BTreeSet, HashSet, LinkedList, VecDeque}` now
28 implement `From<[T; N]>`.][84111]
29 - [`collections::{BTreeMap, HashMap}` now implement `From<[(K, V); N]>`.][84111]
30 This allows you to write the following;
32 let highscores = std::collections::HashMap::from([
44 - [`IntoInnerError::into_error`]
45 - [`IntoInnerError::into_parts`]
46 - [`MaybeUninit::assume_init_mut`]
47 - [`MaybeUninit::assume_init_ref`]
48 - [`MaybeUninit::write`]
50 - [`ops::ControlFlow`]
52 - [`x86::_bittestandcomplement`]
53 - [`x86::_bittestandreset`]
54 - [`x86::_bittestandset`]
55 - [`x86_64::_bittest64`]
56 - [`x86_64::_bittestandcomplement64`]
57 - [`x86_64::_bittestandreset64`]
58 - [`x86_64::_bittestandset64`]
60 The following previously stable functions are now `const`.
62 - [`str::from_utf8_unchecked`]
68 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
69 rustc in parallel such as when using `cargo test`.][cargo/9675]
70 - [The package definition in `cargo metadata` now includes the `"default_run"`
71 field from the manifest.][cargo/9550]
72 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
73 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
74 of packages.][cargo/9663]
78 - [Added "Go to item on exact match" search option.][85876]
79 - [The "Implementors" section on traits no longer shows redundant
80 method definitions.][85970]
81 - [Trait implementations are toggled open by default.][86260] This should make the
82 implementations more searchable by tools like `CTRL+F` in your browser.
83 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
84 through type aliases.][86334]
85 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
86 "Trait Implementations" section.][86513]
91 - [std functions that return an `io::Error` will no longer use the
92 `ErrorKind::Other` variant.][85746] This is to better reflect that these
93 kinds of errors could be categorised [into newer more specific `ErrorKind`
94 variants][79965], and that they do not represent a user error.
95 - [Using environment variable names with `process::Command` on Windows now
96 behaves as expected.][85270] Previously using envionment variables with
97 `Command` would cause them to be ASCII-uppercased.
98 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
99 with `rustdoc::`][86849]
101 [86849]: https://github.com/rust-lang/rust/pull/86849
102 [86513]: https://github.com/rust-lang/rust/pull/86513
103 [86334]: https://github.com/rust-lang/rust/pull/86334
104 [86260]: https://github.com/rust-lang/rust/pull/86260
105 [85970]: https://github.com/rust-lang/rust/pull/85970
106 [85876]: https://github.com/rust-lang/rust/pull/85876
107 [83572]: https://github.com/rust-lang/rust/pull/83572
108 [86294]: https://github.com/rust-lang/rust/pull/86294
109 [86858]: https://github.com/rust-lang/rust/pull/86858
110 [86761]: https://github.com/rust-lang/rust/pull/86761
111 [85769]: https://github.com/rust-lang/rust/pull/85769
112 [85746]: https://github.com/rust-lang/rust/pull/85746
113 [85305]: https://github.com/rust-lang/rust/pull/85305
114 [85270]: https://github.com/rust-lang/rust/pull/85270
115 [84111]: https://github.com/rust-lang/rust/pull/84111
116 [83918]: https://github.com/rust-lang/rust/pull/83918
117 [79965]: https://github.com/rust-lang/rust/pull/79965
118 [87370]: https://github.com/rust-lang/rust/pull/87370
119 [87298]: https://github.com/rust-lang/rust/pull/87298
120 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
121 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
122 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
123 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
124 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
125 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
126 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
127 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
128 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
129 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
130 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
131 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
132 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
133 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
134 [`mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
135 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
136 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
137 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
138 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
139 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
140 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
141 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
142 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
143 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
144 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
147 Version 1.54.0 (2021-07-29)
148 ============================
151 -----------------------
153 - [You can now use macros for values in some built-in attributes.][83366]
154 This primarily allows you to call macros within the `#[doc]` attribute. For
155 example, to include external documentation in your crate, you can now write
158 #![doc = include_str!("README.md")]
161 - [You can now cast between unsized slice types (and types which contain
162 unsized slices) in `const fn`.][85078]
163 - [You can now use multiple generic lifetimes with `impl Trait` where the
164 lifetimes don't explicitly outlive another.][84701] In code this means
165 that you can now have `impl Trait<'a, 'b>` where as before you could
166 only have `impl Trait<'a, 'b> where 'b: 'a`.
169 -----------------------
171 - [Rustc will now search for custom JSON targets in
172 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
173 directory.][83800] You can find your sysroot directory by running
174 `rustc --print sysroot`.
175 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
176 - [You can now use `#[target_feature]` on safe functions when targeting
177 WebAssembly platforms.][84988]
178 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
179 - [Added tier 3\* support for `bpfel-unknown-none`
180 and `bpfeb-unknown-none`.][79608]
181 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
183 \* Refer to Rust's [platform support page][platform-support-doc] for more
184 information on Rust's tiered platform support.
187 -----------------------
189 - [`panic::panic_any` will now `#[track_caller]`.][85745]
190 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
191 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
192 - [The implementations of vendor intrinsics in core::arch have been
193 significantly refactored.][83278] The main user-visible changes are
194 a 50% reduction in the size of libcore.rlib and stricter validation
195 of constant operands passed to intrinsics. The latter is technically
196 a breaking change, but allows Rust to more closely match the C vendor
202 - [`BTreeMap::into_keys`]
203 - [`BTreeMap::into_values`]
204 - [`HashMap::into_keys`]
205 - [`HashMap::into_values`]
207 - [`VecDeque::binary_search`]
208 - [`VecDeque::binary_search_by`]
209 - [`VecDeque::binary_search_by_key`]
210 - [`VecDeque::partition_point`]
215 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
216 the dependency graph.][cargo/9520]
217 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
218 in the tree ][cargo/9499]
219 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
220 macro dependencies.][cargo/9488]
221 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
222 This variable points to a directory that integration tests and benches
223 can use as a "scratchpad" for testing filesystem operations.
227 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
228 - [Previously unsound code is no longer permitted where different constructors in branches
229 could require different lifetimes.][85574]
230 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
231 than before and may reject some previously accepted code.
232 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
233 when compiled with `codegen-units = 1`.][86063]
235 [85574]: https://github.com/rust-lang/rust/issues/85574
236 [86831]: https://github.com/rust-lang/rust/issues/86831
237 [86063]: https://github.com/rust-lang/rust/issues/86063
238 [86831]: https://github.com/rust-lang/rust/issues/86831
239 [79608]: https://github.com/rust-lang/rust/pull/79608
240 [84988]: https://github.com/rust-lang/rust/pull/84988
241 [84701]: https://github.com/rust-lang/rust/pull/84701
242 [84072]: https://github.com/rust-lang/rust/pull/84072
243 [85745]: https://github.com/rust-lang/rust/pull/85745
244 [84744]: https://github.com/rust-lang/rust/pull/84744
245 [85078]: https://github.com/rust-lang/rust/pull/85078
246 [84717]: https://github.com/rust-lang/rust/pull/84717
247 [83800]: https://github.com/rust-lang/rust/pull/83800
248 [83366]: https://github.com/rust-lang/rust/pull/83366
249 [83278]: https://github.com/rust-lang/rust/pull/83278
250 [85292]: https://github.com/rust-lang/rust/pull/85292
251 [82834]: https://github.com/rust-lang/rust/pull/82834
252 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
253 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
254 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
255 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
256 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
257 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
258 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
259 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
260 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
261 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
262 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
264 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
266 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
268 Version 1.53.0 (2021-06-17)
269 ============================
272 -----------------------
273 - [You can now use unicode for identifiers.][83799] This allows multilingual
274 identifiers but still doesn't allow glyphs that are not considered characters
275 such as `◆` or `🦀`. More specifically you can now use any identifier that
276 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
277 is the same standard as languages like Python, however Rust uses NFC
278 normalization which may be different from other languages.
279 - [You can now specify "or patterns" inside pattern matches.][79278]
280 Previously you could only use `|` (OR) on complete patterns. E.g.
284 matches!(x, Some(1) | Some(2));
286 matches!(x, Some(1 | 2));
288 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
289 has the same semantics as the `:pat` matcher. This is to allow `:pat`
290 to change semantics to being a pattern fragment in a future edition.
293 -----------------------
294 - [Updated the minimum external LLVM version to LLVM 10.][83387]
295 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
296 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
298 \* Refer to Rust's [platform support page][platform-support-doc] for more
299 information on Rust's tiered platform support.
302 -----------------------
303 - [Abort messages will now forward to `android_set_abort_message` on
304 Android platforms when available.][81469]
305 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
306 - [Arrays of any length now implement `IntoIterator`.][84147]
307 Currently calling `.into_iter()` as a method on an array will
308 return `impl Iterator<Item=&T>`, but this may change in a
309 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
310 directly on arrays will provide `impl Iterator<Item=T>` as expected.
311 - [`leading_zeros`, and `trailing_zeros` are now available on all
312 `NonZero` integer types.][84082]
313 - [`{f32, f64}::from_str` now parse and print special values
314 (`NaN`, `-0`) according to IEEE 754.][78618]
315 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
316 - [Add the `BITS` associated constant to all numeric types.][82565]
320 - [`AtomicBool::fetch_update`]
321 - [`AtomicPtr::fetch_update`]
322 - [`BTreeMap::retain`]
323 - [`BTreeSet::retain`]
324 - [`BufReader::seek_relative`]
325 - [`DebugStruct::non_exhaustive`]
328 - [`Duration::is_zero`]
329 - [`Duration::saturating_add`]
330 - [`Duration::saturating_mul`]
331 - [`Duration::saturating_sub`]
332 - [`ErrorKind::Unsupported`]
334 - [`Ordering::is_eq`]
335 - [`Ordering::is_ge`]
336 - [`Ordering::is_gt`]
337 - [`Ordering::is_le`]
338 - [`Ordering::is_lt`]
339 - [`Ordering::is_ne`]
340 - [`OsStr::is_ascii`]
341 - [`OsStr::make_ascii_lowercase`]
342 - [`OsStr::make_ascii_uppercase`]
343 - [`OsStr::to_ascii_lowercase`]
344 - [`OsStr::to_ascii_uppercase`]
345 - [`Peekable::peek_mut`]
346 - [`Rc::decrement_strong_count`]
347 - [`Rc::increment_strong_count`]
348 - [`Vec::extend_from_within`]
349 - [`array::from_mut`]
350 - [`array::from_ref`]
351 - [`cmp::max_by_key`]
353 - [`cmp::min_by_key`]
355 - [`f32::is_subnormal`]
356 - [`f64::is_subnormal`]
359 -----------------------
360 - [Cargo now supports git repositories where the default `HEAD` branch is not
361 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
362 which can handle default branches correctly.
363 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
364 - [The `authors` field is no longer included in `Cargo.toml` for new
365 projects.][cargo/9282]
368 -----------------------
369 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
370 without hyperlinks.][81764]
374 - [Implement token-based handling of attributes during expansion][82608]
375 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
376 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
377 to confusion and potential security vulnerabilities and [is no
378 longer recommended][ietf6943].
379 - [The added `BITS` constant may conflict with external definitions.][85667]
380 In particular, this was known to be a problem in the `lexical-core` crate,
381 but they have published fixes for semantic versions 0.4 through 0.7. To
382 update this dependency alone, use `cargo update -p lexical-core`.
383 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
387 These changes provide no direct user facing benefits, but represent significant
388 improvements to the internals and overall performance of rustc and
391 - [Rework the `std::sys::windows::alloc` implementation.][83065]
392 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
393 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
394 - [Rework rustdoc const type][82873]
396 [85667]: https://github.com/rust-lang/rust/pull/85667
397 [83386]: https://github.com/rust-lang/rust/pull/83386
398 [82771]: https://github.com/rust-lang/rust/pull/82771
399 [84147]: https://github.com/rust-lang/rust/pull/84147
400 [84082]: https://github.com/rust-lang/rust/pull/84082
401 [83799]: https://github.com/rust-lang/rust/pull/83799
402 [83681]: https://github.com/rust-lang/rust/pull/83681
403 [83652]: https://github.com/rust-lang/rust/pull/83652
404 [83387]: https://github.com/rust-lang/rust/pull/83387
405 [82873]: https://github.com/rust-lang/rust/pull/82873
406 [82864]: https://github.com/rust-lang/rust/pull/82864
407 [82608]: https://github.com/rust-lang/rust/pull/82608
408 [82565]: https://github.com/rust-lang/rust/pull/82565
409 [80525]: https://github.com/rust-lang/rust/pull/80525
410 [79278]: https://github.com/rust-lang/rust/pull/79278
411 [78618]: https://github.com/rust-lang/rust/pull/78618
412 [77704]: https://github.com/rust-lang/rust/pull/77704
413 [83941]: https://github.com/rust-lang/rust/pull/83941
414 [83065]: https://github.com/rust-lang/rust/pull/83065
415 [81764]: https://github.com/rust-lang/rust/pull/81764
416 [81469]: https://github.com/rust-lang/rust/pull/81469
417 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
418 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
419 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
420 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
421 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
422 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
423 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
424 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
425 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
426 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
427 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
428 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
429 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
430 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
431 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
432 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
433 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
434 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
435 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
436 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
437 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
438 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
439 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
440 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
441 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
442 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
443 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
444 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
445 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
446 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
447 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
448 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
449 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
450 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
451 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
452 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
453 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
454 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
455 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
456 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
457 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
458 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
461 Version 1.52.1 (2021-05-10)
462 ============================
464 This release disables incremental compilation, unless the user has explicitly
465 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
467 This is due to the widespread, and frequently occuring, breakage encountered by
468 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
469 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
470 newly added incremental verification are still present in past stable versions,
471 and are not yet fixed on any channel. These bugs can lead to miscompilation of
474 These problems only affect incremental builds, so release builds with Cargo
475 should not be affected unless the user has explicitly opted into incremental.
476 Debug and check builds are affected.
478 See [84970] for more details.
480 [84970]: https://github.com/rust-lang/rust/issues/84970
482 Version 1.52.0 (2021-05-06)
483 ============================
487 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
488 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
489 is allowed by default, and may become a warning or hard error in a
491 - [You can now cast mutable references to arrays to a pointer of the same type as
496 - [Upgraded the default LLVM to LLVM 12.][81451]
498 Added tier 3\* support for the following targets.
500 - [`s390x-unknown-linux-musl`][82166]
501 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
502 - [`powerpc-unknown-openbsd`][82733]
504 \* Refer to Rust's [platform support page][platform-support-doc] for more
505 information on Rust's tiered platform support.
509 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
510 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
511 - [`Arc<impl Error>` now implements `error::Error`.][80553]
512 - [All integer division and remainder operations are now `const`.][80962]
516 - [`Arguments::as_str`]
518 - [`char::REPLACEMENT_CHARACTER`]
519 - [`char::UNICODE_VERSION`]
520 - [`char::decode_utf16`]
521 - [`char::from_digit`]
522 - [`char::from_u32_unchecked`]
524 - [`slice::partition_point`]
525 - [`str::rsplit_once`]
526 - [`str::split_once`]
528 The following previously stable APIs are now `const`.
531 - [`char::len_utf16`]
532 - [`char::to_ascii_uppercase`]
533 - [`char::to_ascii_lowercase`]
534 - [`char::eq_ignore_ascii_case`]
535 - [`u8::to_ascii_uppercase`]
536 - [`u8::to_ascii_lowercase`]
537 - [`u8::eq_ignore_ascii_case`]
541 - [Rustdoc lints are now treated as a tool lint, meaning that
542 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
543 Using the old style is still allowed, and will become a warning in
545 - [Rustdoc now supports argument files.][82261]
546 - [Rustdoc now generates smart punctuation for documentation.][79423]
547 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
555 - [You can now pass multiple filters to tests.][81356] E.g.
556 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
557 - [Rustup now distributes PDB symbols for the `std` library on Windows,
558 allowing you to see `std` symbols when debugging.][82218]
562 These changes provide no direct user facing benefits, but represent significant
563 improvements to the internals and overall performance of rustc and
566 - [Check the result cache before the DepGraph when ensuring queries][81855]
567 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
568 - [Only store a LocalDefId in some HIR nodes][81611]
569 - [Store HIR attributes in a side table][79519]
573 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
574 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
575 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
576 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
577 languages in code blocks.][78429]
578 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
579 - [Changes in how proc macros handle whitespace may lead to panics when used
580 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
581 - [Turn `#[derive]` into a regular macro attribute][79078]
583 [84136]: https://github.com/rust-lang/rust/issues/84136
584 [80763]: https://github.com/rust-lang/rust/pull/80763
585 [82166]: https://github.com/rust-lang/rust/pull/82166
586 [82121]: https://github.com/rust-lang/rust/pull/82121
587 [81879]: https://github.com/rust-lang/rust/pull/81879
588 [82261]: https://github.com/rust-lang/rust/pull/82261
589 [82218]: https://github.com/rust-lang/rust/pull/82218
590 [82216]: https://github.com/rust-lang/rust/pull/82216
591 [82202]: https://github.com/rust-lang/rust/pull/82202
592 [81855]: https://github.com/rust-lang/rust/pull/81855
593 [81766]: https://github.com/rust-lang/rust/pull/81766
594 [81744]: https://github.com/rust-lang/rust/pull/81744
595 [81611]: https://github.com/rust-lang/rust/pull/81611
596 [81479]: https://github.com/rust-lang/rust/pull/81479
597 [81451]: https://github.com/rust-lang/rust/pull/81451
598 [81356]: https://github.com/rust-lang/rust/pull/81356
599 [80962]: https://github.com/rust-lang/rust/pull/80962
600 [80553]: https://github.com/rust-lang/rust/pull/80553
601 [80527]: https://github.com/rust-lang/rust/pull/80527
602 [79519]: https://github.com/rust-lang/rust/pull/79519
603 [79423]: https://github.com/rust-lang/rust/pull/79423
604 [79208]: https://github.com/rust-lang/rust/pull/79208
605 [78429]: https://github.com/rust-lang/rust/pull/78429
606 [82733]: https://github.com/rust-lang/rust/pull/82733
607 [82594]: https://github.com/rust-lang/rust/pull/82594
608 [79078]: https://github.com/rust-lang/rust/pull/79078
609 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
610 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
611 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
612 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
613 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
614 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
615 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
616 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
617 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
618 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
619 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
620 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
621 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
622 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
623 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
624 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
625 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
626 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
627 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
628 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
629 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
630 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
632 Version 1.51.0 (2021-03-25)
633 ============================
637 - [You can now parameterize items such as functions, traits, and `struct`s by constant
638 values in addition to by types and lifetimes.][79135] Also known as "const generics"
639 E.g. you can now write the following. Note: Only values of primitive integers,
640 `bool`, or `char` types are currently permitted.
642 struct GenericArray<T, const LENGTH: usize> {
646 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
647 const fn last(&self) -> Option<&T> {
651 Some(&self.inner[LENGTH - 1])
661 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
662 This option controls whether debug information is split across multiple files
663 or packed into a single file. **Note** This option is unstable on other platforms.
664 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
665 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
666 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
667 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
669 \* Refer to Rust's [platform support page][platform-support-doc] for more
670 information on Rust's tiered platform support.
675 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
676 - [`str` now implements `AsMut<str>`.][80279]
677 - [`u64` and `u128` now implement `From<char>`.][79502]
678 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
679 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
680 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
681 - [`io::Empty` now implements `io::Seek`.][78044]
682 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
683 `T: ?Sized` types.][80764]
684 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
690 - [`Arc::decrement_strong_count`]
691 - [`Arc::increment_strong_count`]
692 - [`Once::call_once_force`]
693 - [`Peekable::next_if_eq`]
694 - [`Peekable::next_if`]
695 - [`Seek::stream_position`]
696 - [`array::IntoIter`]
697 - [`panic::panic_any`]
699 - [`ptr::addr_of_mut!`]
700 - [`slice::fill_with`]
701 - [`slice::split_inclusive_mut`]
702 - [`slice::split_inclusive`]
703 - [`slice::strip_prefix`]
704 - [`slice::strip_suffix`]
705 - [`str::split_inclusive`]
706 - [`sync::OnceState`]
708 - [`VecDeque::range`]
709 - [`VecDeque::range_mut`]
713 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
714 codegen option.][cargo/9112]
715 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
716 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
717 to avoid unifying features of dependencies where that unification could be unwanted.
718 Such as using the same dependency with a `std` feature in a build scripts and
719 proc-macros, while using the `no-std` feature in the final binary. See the
720 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
725 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
726 - [You can now provide a `--default-theme` flag which sets the default theme to use for
727 documentation.][79642]
729 Various improvements to intra-doc links:
731 - [You can link to non-path primitives such as `slice`.][80181]
732 - [You can link to associated items.][74489]
733 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
737 - [You can now pass `--include-ignored` to tests (e.g. with
738 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
743 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
744 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
746 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
747 for the distributed artifacts.][81521]
748 - `armv5te-unknown-linux-gnueabi`
749 - `sparc64-unknown-linux-gnu`
750 - `thumbv7neon-unknown-linux-gnueabihf`
751 - `armv7-unknown-linux-gnueabi`
752 - `x86_64-unknown-linux-gnux32`
753 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
758 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
760 [79135]: https://github.com/rust-lang/rust/pull/79135
761 [74489]: https://github.com/rust-lang/rust/pull/74489
762 [76934]: https://github.com/rust-lang/rust/pull/76934
763 [79570]: https://github.com/rust-lang/rust/pull/79570
764 [80181]: https://github.com/rust-lang/rust/pull/80181
765 [79642]: https://github.com/rust-lang/rust/pull/79642
766 [80945]: https://github.com/rust-lang/rust/pull/80945
767 [80279]: https://github.com/rust-lang/rust/pull/80279
768 [80053]: https://github.com/rust-lang/rust/pull/80053
769 [79502]: https://github.com/rust-lang/rust/pull/79502
770 [75180]: https://github.com/rust-lang/rust/pull/75180
771 [79135]: https://github.com/rust-lang/rust/pull/79135
772 [81521]: https://github.com/rust-lang/rust/pull/81521
773 [80968]: https://github.com/rust-lang/rust/pull/80968
774 [80959]: https://github.com/rust-lang/rust/pull/80959
775 [80718]: https://github.com/rust-lang/rust/pull/80718
776 [80653]: https://github.com/rust-lang/rust/pull/80653
777 [80579]: https://github.com/rust-lang/rust/pull/80579
778 [79998]: https://github.com/rust-lang/rust/pull/79998
779 [78044]: https://github.com/rust-lang/rust/pull/78044
780 [81455]: https://github.com/rust-lang/rust/pull/81455
781 [80764]: https://github.com/rust-lang/rust/pull/80764
782 [80749]: https://github.com/rust-lang/rust/pull/80749
783 [80662]: https://github.com/rust-lang/rust/pull/80662
784 [79134]: https://github.com/rust-lang/rust/pull/79134
785 [80966]: https://github.com/rust-lang/rust/pull/80966
786 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
787 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
788 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
789 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
790 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
791 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
792 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
793 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
794 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
795 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
796 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
797 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
798 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
799 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
800 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
801 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
802 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
803 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
804 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
805 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
806 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
807 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
808 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
810 Version 1.50.0 (2021-02-11)
811 ============================
814 -----------------------
815 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
816 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
817 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
820 -----------------------
821 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
822 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
823 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
824 - [Dropped support for all cloudabi targets.][78439]
826 \* Refer to Rust's [platform support page][platform-support-doc] for more
827 information on Rust's tiered platform support.
830 -----------------------
832 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
833 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
834 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
835 This value cannot be a valid file descriptor, and now means `Option<File>` takes
836 up the same amount of space as `File`.
842 - [`btree_map::Entry::or_insert_with_key`]
845 - [`hash_map::Entry::or_insert_with_key`]
849 - [`UnsafeCell::get_mut`]
851 The following previously stable methods are now `const`.
853 - [`IpAddr::is_ipv4`]
854 - [`IpAddr::is_ipv6`]
855 - [`IpAddr::is_unspecified`]
856 - [`IpAddr::is_loopback`]
857 - [`IpAddr::is_multicast`]
858 - [`Ipv4Addr::octets`]
859 - [`Ipv4Addr::is_loopback`]
860 - [`Ipv4Addr::is_private`]
861 - [`Ipv4Addr::is_link_local`]
862 - [`Ipv4Addr::is_multicast`]
863 - [`Ipv4Addr::is_broadcast`]
864 - [`Ipv4Addr::is_documentation`]
865 - [`Ipv4Addr::to_ipv6_compatible`]
866 - [`Ipv4Addr::to_ipv6_mapped`]
867 - [`Ipv6Addr::segments`]
868 - [`Ipv6Addr::is_unspecified`]
869 - [`Ipv6Addr::is_loopback`]
870 - [`Ipv6Addr::is_multicast`]
871 - [`Ipv6Addr::to_ipv4`]
874 - [`Layout::from_size_align`]
875 - `pow` for all integer types.
876 - `checked_pow` for all integer types.
877 - `saturating_pow` for all integer types.
878 - `wrapping_pow` for all integer types.
879 - `next_power_of_two` for all unsigned integer types.
880 - `checked_next_power_of_two` for all unsigned integer types.
883 -----------------------
885 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
886 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
887 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
888 contents of that directory for changes.][cargo/8973]
889 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
894 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
895 - [Running tests will now print the total time taken to execute.][75752]
900 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
901 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
902 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
903 unhygenic `macro_rules!` macros.][79472]
904 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
905 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
906 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
907 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
908 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
909 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
911 [74989]: https://github.com/rust-lang/rust/pull/74989
912 [79261]: https://github.com/rust-lang/rust/pull/79261
913 [79896]: https://github.com/rust-lang/rust/pull/79896
914 [79484]: https://github.com/rust-lang/rust/pull/79484
915 [79472]: https://github.com/rust-lang/rust/pull/79472
916 [79270]: https://github.com/rust-lang/rust/pull/79270
917 [79003]: https://github.com/rust-lang/rust/pull/79003
918 [78864]: https://github.com/rust-lang/rust/pull/78864
919 [78636]: https://github.com/rust-lang/rust/pull/78636
920 [78439]: https://github.com/rust-lang/rust/pull/78439
921 [78343]: https://github.com/rust-lang/rust/pull/78343
922 [78296]: https://github.com/rust-lang/rust/pull/78296
923 [78068]: https://github.com/rust-lang/rust/pull/78068
924 [75752]: https://github.com/rust-lang/rust/pull/75752
925 [74699]: https://github.com/rust-lang/rust/pull/74699
926 [78142]: https://github.com/rust-lang/rust/pull/78142
927 [77484]: https://github.com/rust-lang/rust/pull/77484
928 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
929 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
930 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
931 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
932 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
933 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
934 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
935 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
936 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
937 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
938 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
939 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
940 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
941 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
942 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
943 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
944 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
945 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
946 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
947 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
948 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
949 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
950 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
951 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
952 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
953 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
954 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
955 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
956 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
957 [`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
958 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
959 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
960 [`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
961 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
964 Version 1.49.0 (2020-12-31)
965 ============================
968 -----------------------
970 - [Unions can now implement `Drop`, and you can now have a field in a union
971 with `ManuallyDrop<T>`.][77547]
972 - [You can now cast uninhabited enums to integers.][76199]
973 - [You can now bind by reference and by move in patterns.][76119] This
974 allows you to selectively borrow individual components of a type. E.g.
982 let person = Person {
983 name: String::from("Alice"),
987 // `name` is moved out of person, but `age` is referenced.
988 let Person { name, ref age } = person;
989 println!("{} {}", name, age);
993 -----------------------
995 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
996 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
997 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
998 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
999 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1000 - [Output from threads spawned in tests is now captured.][78227]
1001 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1003 \* Refer to Rust's [platform support page][platform-support-doc] for more
1004 information on Rust's tiered platform support.
1007 -----------------------
1009 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1010 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1015 - [`slice::select_nth_unstable`]
1016 - [`slice::select_nth_unstable_by`]
1017 - [`slice::select_nth_unstable_by_key`]
1019 The following previously stable methods are now `const`.
1021 - [`Poll::is_ready`]
1022 - [`Poll::is_pending`]
1025 -----------------------
1026 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1027 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1028 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1029 variable will be set if the crate being built is one the user selected to build, either
1030 with `-p` or through defaults.
1031 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1037 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1038 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1039 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1040 Previously such invalid or unused attributes could be ignored.
1041 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1042 read [this post about the changes][rustdoc-ws-post] for more details.
1043 - [Trait bounds are no longer inferred for associated types.][79904]
1047 These changes provide no direct user facing benefits, but represent significant
1048 improvements to the internals and overall performance of rustc and
1051 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1052 Local Storage model.][78201]
1053 - [Calculate visibilities once in resolve.][78077]
1054 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1055 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1058 [75991]: https://github.com/rust-lang/rust/pull/75991
1059 [78951]: https://github.com/rust-lang/rust/pull/78951
1060 [78848]: https://github.com/rust-lang/rust/pull/78848
1061 [78746]: https://github.com/rust-lang/rust/pull/78746
1062 [78376]: https://github.com/rust-lang/rust/pull/78376
1063 [78228]: https://github.com/rust-lang/rust/pull/78228
1064 [78227]: https://github.com/rust-lang/rust/pull/78227
1065 [78201]: https://github.com/rust-lang/rust/pull/78201
1066 [78109]: https://github.com/rust-lang/rust/pull/78109
1067 [78077]: https://github.com/rust-lang/rust/pull/78077
1068 [77997]: https://github.com/rust-lang/rust/pull/77997
1069 [77703]: https://github.com/rust-lang/rust/pull/77703
1070 [77547]: https://github.com/rust-lang/rust/pull/77547
1071 [77015]: https://github.com/rust-lang/rust/pull/77015
1072 [76199]: https://github.com/rust-lang/rust/pull/76199
1073 [76119]: https://github.com/rust-lang/rust/pull/76119
1074 [75914]: https://github.com/rust-lang/rust/pull/75914
1075 [79004]: https://github.com/rust-lang/rust/pull/79004
1076 [78676]: https://github.com/rust-lang/rust/pull/78676
1077 [79904]: https://github.com/rust-lang/rust/issues/79904
1078 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1079 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1080 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1081 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1082 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1083 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1084 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1085 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1086 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1087 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1088 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1090 Version 1.48.0 (2020-11-19)
1091 ==========================
1096 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1097 is still rejected *semantically*, but can now be parsed by procedural macros.
1101 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1102 `rustc` whether to link its own C runtime and libraries or to rely on a external
1103 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1104 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1105 Note: If you're using cargo you must explicitly pass the `--target` flag.
1106 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1108 \* Refer to Rust's [platform support page][platform-support-doc] for more
1109 information on Rust's tiered platform support.
1113 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1114 and `&Stderr`.][76275]
1115 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1116 - [The `matches!` macro now supports having a trailing comma.][74880]
1117 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1118 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1122 - [`slice::as_ptr_range`]
1123 - [`slice::as_mut_ptr_range`]
1124 - [`VecDeque::make_contiguous`]
1125 - [`future::pending`]
1128 The following previously stable methods are now `const fn`'s:
1130 - [`Option::is_some`]
1131 - [`Option::is_none`]
1132 - [`Option::as_ref`]
1134 - [`Result::is_err`]
1135 - [`Result::as_ref`]
1136 - [`Ordering::reverse`]
1137 - [`Ordering::then`]
1144 - [You can now link to items in `rustdoc` using the intra-doc link
1145 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1146 a link to `std::future`'s documentation. See ["Linking to items by
1147 name"][intradoc-links] for more information.
1148 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1149 when searching through `rustdoc`'s UI.][75740]
1153 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1154 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1155 promoted to `'static` lifetime any more inside `const fn`s.
1156 - [Associated type bindings on trait objects are now verified to meet the bounds
1157 declared on the trait when checking that they implement the trait.][27675]
1158 - [When trait bounds on associated types or opaque types are ambiguous, the
1159 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1160 - [Fixed recursive nonterminals not being expanded in macros during
1161 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1162 correctly handling recursive nonterminal tokens.
1163 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1164 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1165 in places where they have no effect.][73461]
1166 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1167 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1168 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1169 disallow zero-initialization.][71274]
1170 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1171 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1172 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1173 see the [`catch_unwind`] documentation for further information.
1179 These changes provide no direct user facing benefits, but represent significant
1180 improvements to the internals and overall performance of rustc and
1183 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1184 You can continue building with `make` by setting `ninja=false` in
1186 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1187 - [Made `ensure_sufficient_stack()` non-generic][76680]
1189 [78143]: https://github.com/rust-lang/rust/issues/78143
1190 [76680]: https://github.com/rust-lang/rust/pull/76680/
1191 [76030]: https://github.com/rust-lang/rust/pull/76030/
1192 [70212]: https://github.com/rust-lang/rust/pull/70212/
1193 [27675]: https://github.com/rust-lang/rust/issues/27675/
1194 [54121]: https://github.com/rust-lang/rust/issues/54121/
1195 [71274]: https://github.com/rust-lang/rust/pull/71274/
1196 [77386]: https://github.com/rust-lang/rust/pull/77386/
1197 [77153]: https://github.com/rust-lang/rust/pull/77153/
1198 [77055]: https://github.com/rust-lang/rust/pull/77055/
1199 [76275]: https://github.com/rust-lang/rust/pull/76275/
1200 [76310]: https://github.com/rust-lang/rust/pull/76310/
1201 [76420]: https://github.com/rust-lang/rust/pull/76420/
1202 [76158]: https://github.com/rust-lang/rust/pull/76158/
1203 [75857]: https://github.com/rust-lang/rust/pull/75857/
1204 [75585]: https://github.com/rust-lang/rust/pull/75585/
1205 [75740]: https://github.com/rust-lang/rust/pull/75740/
1206 [75502]: https://github.com/rust-lang/rust/pull/75502/
1207 [74880]: https://github.com/rust-lang/rust/pull/74880/
1208 [74922]: https://github.com/rust-lang/rust/pull/74922/
1209 [74430]: https://github.com/rust-lang/rust/pull/74430/
1210 [74194]: https://github.com/rust-lang/rust/pull/74194/
1211 [73461]: https://github.com/rust-lang/rust/pull/73461/
1212 [73166]: https://github.com/rust-lang/rust/pull/73166/
1213 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1214 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1215 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1216 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1217 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1218 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1219 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1220 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1221 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1222 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1223 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1224 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1225 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1226 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1227 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1230 Version 1.47.0 (2020-10-08)
1231 ==========================
1235 - [Closures will now warn when not used.][74869]
1239 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1240 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1242 - [Upgraded to LLVM 11.][73526]
1243 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1244 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1245 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1247 \* Refer to Rust's [platform support page][platform-support-doc] for more
1248 information on Rust's tiered platform support.
1252 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1253 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1254 those of length less than 33.][74060]
1255 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1256 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1257 `PartialEq`, and `PartialOrd`.][73583]
1261 - [`Ident::new_raw`]
1262 - [`Range::is_empty`]
1263 - [`RangeInclusive::is_empty`]
1264 - [`Result::as_deref`]
1265 - [`Result::as_deref_mut`]
1267 - [`pointer::offset_from`]
1271 The following previously stable APIs have now been made const.
1273 - [The `new` method for all `NonZero` integers.][73858]
1274 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1275 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1276 methods for all integers.][73858]
1277 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1278 signed integers.][73858]
1279 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1280 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1281 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1282 `is_ascii_control` methods for `char` and `u8`.][73858]
1286 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1287 You can override this by setting the following in your `Cargo.toml`.
1289 [profile.release.build-override]
1292 - [`cargo-help` will now display man pages for commands rather just the
1293 `--help` text.][cargo/8456]
1294 - [`cargo-metadata` now emits a `test` field indicating if a target has
1295 tests enabled.][cargo/8478]
1296 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1297 - [`cargo-publish` will now use an alternative registry by default if it's the
1298 only registry specified in `package.publish`.][cargo/8571]
1302 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1303 type based search.][75366]
1304 - [Added the Ayu theme to rustdoc.][71237]
1308 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1309 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1310 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1311 help to preserve more span information.][73084] These changes may cause
1312 compiliation errors if your macro was unhygenic or didn't correctly handle
1314 - [Moved support for the CloudABI target to tier 3.][75568]
1315 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1316 - [Added the `rustc-docs` component.][75560] This allows you to install
1317 and read the documentation for the compiler internal APIs. (Currently only
1318 available for `x86_64-unknown-linux-gnu`.)
1323 - [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.
1325 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1326 [75048]: https://github.com/rust-lang/rust/pull/75048/
1327 [74163]: https://github.com/rust-lang/rust/pull/74163/
1328 [71237]: https://github.com/rust-lang/rust/pull/71237/
1329 [74869]: https://github.com/rust-lang/rust/pull/74869/
1330 [73858]: https://github.com/rust-lang/rust/pull/73858/
1331 [75716]: https://github.com/rust-lang/rust/pull/75716/
1332 [75908]: https://github.com/rust-lang/rust/pull/75908/
1333 [75516]: https://github.com/rust-lang/rust/pull/75516/
1334 [75560]: https://github.com/rust-lang/rust/pull/75560/
1335 [75568]: https://github.com/rust-lang/rust/pull/75568/
1336 [75366]: https://github.com/rust-lang/rust/pull/75366/
1337 [75204]: https://github.com/rust-lang/rust/pull/75204/
1338 [74650]: https://github.com/rust-lang/rust/pull/74650/
1339 [74419]: https://github.com/rust-lang/rust/pull/74419/
1340 [73964]: https://github.com/rust-lang/rust/pull/73964/
1341 [74021]: https://github.com/rust-lang/rust/pull/74021/
1342 [74060]: https://github.com/rust-lang/rust/pull/74060/
1343 [73893]: https://github.com/rust-lang/rust/pull/73893/
1344 [73526]: https://github.com/rust-lang/rust/pull/73526/
1345 [73583]: https://github.com/rust-lang/rust/pull/73583/
1346 [73084]: https://github.com/rust-lang/rust/pull/73084/
1347 [73197]: https://github.com/rust-lang/rust/pull/73197/
1348 [72488]: https://github.com/rust-lang/rust/pull/72488/
1349 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1350 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1351 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1352 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1353 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1354 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1355 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1356 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1357 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1358 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1359 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1360 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1361 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1362 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1363 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1366 Version 1.46.0 (2020-08-27)
1367 ==========================
1371 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1372 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1373 const functions.][73862]
1374 - [The `#[track_caller]` attribute can now be added to functions to use the
1375 function's caller's location information for panic messages.][72445]
1376 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1377 `x.0.0` over `(x.0).0`.
1378 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1379 You currently can't use `mem::transmute` in constant functions.
1383 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1384 - [Enabled static "Position Independent Executables" by default
1385 for `x86_64-unknown-linux-musl`.][70740]
1389 - [`mem::forget` is now a `const fn`.][73887]
1390 - [`String` now implements `From<char>`.][73466]
1391 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1392 integer types.][73032]
1393 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1394 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1395 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1396 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1397 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1398 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1403 - [`vec::Drain::as_slice`]
1407 Added a number of new environment variables that are now available when
1408 compiling your crate.
1410 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1411 the specific binary being compiled and the name of the crate.
1412 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1413 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1417 - [The target configuration option `abi_blacklist` has been renamed
1418 to `unsupported_abis`.][74150] The old name will still continue to work.
1419 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1420 This was previously accepted but will become a hard error in a future release.
1421 - [Rustc will fail to compile if you have a struct with
1422 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1424 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1425 ensure that spans have the correct information, and may cause breakage if you
1426 were relying on receiving spans with dummy information.
1427 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1428 a legacy installer that was replaced by a MSI installer a few years ago but
1429 was still being built.
1430 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1431 - [Rustc will no longer accept overlapping trait implementations that only
1432 differ in how the lifetime was bound.][72493]
1433 - [Rustc now correctly relates the lifetime of an existential associated
1434 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1435 you to pass a shorter lifetime than expected.
1436 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1437 The library will need to be installed for `rustc` to work, even though we
1438 expect it to be already available on most systems.
1439 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1441 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1442 exact output returned by rustc's pretty printing is an unstable
1443 implementation detail: we recommend any macro relying on it to switch to a
1444 more robust parsing system.
1446 [75453]: https://github.com/rust-lang/rust/issues/75453/
1447 [74820]: https://github.com/rust-lang/rust/issues/74820/
1448 [74420]: https://github.com/rust-lang/rust/issues/74420/
1449 [74109]: https://github.com/rust-lang/rust/pull/74109/
1450 [74150]: https://github.com/rust-lang/rust/pull/74150/
1451 [73862]: https://github.com/rust-lang/rust/pull/73862/
1452 [73887]: https://github.com/rust-lang/rust/pull/73887/
1453 [73466]: https://github.com/rust-lang/rust/pull/73466/
1454 [73516]: https://github.com/rust-lang/rust/pull/73516/
1455 [73293]: https://github.com/rust-lang/rust/pull/73293/
1456 [73007]: https://github.com/rust-lang/rust/pull/73007/
1457 [73032]: https://github.com/rust-lang/rust/pull/73032/
1458 [72920]: https://github.com/rust-lang/rust/pull/72920/
1459 [72569]: https://github.com/rust-lang/rust/pull/72569/
1460 [72583]: https://github.com/rust-lang/rust/pull/72583/
1461 [72584]: https://github.com/rust-lang/rust/pull/72584/
1462 [72717]: https://github.com/rust-lang/rust/pull/72717/
1463 [72437]: https://github.com/rust-lang/rust/pull/72437/
1464 [72445]: https://github.com/rust-lang/rust/pull/72445/
1465 [72486]: https://github.com/rust-lang/rust/pull/72486/
1466 [72493]: https://github.com/rust-lang/rust/pull/72493/
1467 [72331]: https://github.com/rust-lang/rust/pull/72331/
1468 [71896]: https://github.com/rust-lang/rust/pull/71896/
1469 [71660]: https://github.com/rust-lang/rust/pull/71660/
1470 [71322]: https://github.com/rust-lang/rust/pull/71322/
1471 [70740]: https://github.com/rust-lang/rust/pull/70740/
1472 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1473 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1474 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1475 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1476 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1479 Version 1.45.2 (2020-08-03)
1480 ==========================
1482 * [Fix bindings in tuple struct patterns][74954]
1483 * [Fix track_caller integration with trait objects][74784]
1485 [74954]: https://github.com/rust-lang/rust/issues/74954
1486 [74784]: https://github.com/rust-lang/rust/issues/74784
1489 Version 1.45.1 (2020-07-30)
1490 ==========================
1492 * [Fix const propagation with references.][73613]
1493 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1494 * [Avoid spurious implicit region bound.][74509]
1495 * [Install clippy on x.py install][74457]
1497 [73613]: https://github.com/rust-lang/rust/pull/73613
1498 [73078]: https://github.com/rust-lang/rust/issues/73078
1499 [74509]: https://github.com/rust-lang/rust/pull/74509
1500 [74457]: https://github.com/rust-lang/rust/pull/74457
1503 Version 1.45.0 (2020-07-16)
1504 ==========================
1508 - [Out of range float to int conversions using `as` has been defined as a saturating
1509 conversion.][71269] This was previously undefined behaviour, but you can use the
1510 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1511 may be desirable in rare performance sensitive situations.
1512 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1513 using `u64`.][70705]
1514 - [Function like procedural macros can now be used in expression, pattern, and statement
1515 positions.][68717] This means you can now use a function-like procedural macro
1516 anywhere you can use a declarative (`macro_rules!`) macro.
1520 - [You can now override individual target features through the `target-feature`
1521 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1522 equivalent to `-C target-feature=+avx2,+fma`.
1523 - [Added the `force-unwind-tables` flag.][69984] This option allows
1524 rustc to always generate unwind tables regardless of panic strategy.
1525 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1526 to include LLVM bitcode into generated `rlib`s (this is on by default).
1527 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1528 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1529 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1530 - [Upgraded to LLVM 10.][67759]
1532 \* Refer to Rust's [platform support page][platform-support-doc] for more
1533 information on Rust's tiered platform support.
1538 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1540 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1541 - [You can now use `char` with
1542 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1543 a range of codepoints.][72413] E.g.
1544 you can now write the following;
1546 for ch in 'a'..='z' {
1550 // Prints "abcdefghijklmnopqrstuvwxyz"
1552 - [`OsString` now implements `FromStr`.][71662]
1553 - [The `saturating_neg` method has been added to all signed integer primitive
1554 types, and the `saturating_abs` method has been added for all integer
1555 primitive types.][71886]
1556 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1557 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1559 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1560 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1561 integer types.][69813]
1562 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1563 integer types.][72324]
1564 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1569 - [`BTreeMap::remove_entry`]
1571 - [`rc::Weak::as_ptr`]
1572 - [`rc::Weak::from_raw`]
1573 - [`rc::Weak::into_raw`]
1574 - [`str::strip_prefix`]
1575 - [`str::strip_suffix`]
1576 - [`sync::Weak::as_ptr`]
1577 - [`sync::Weak::from_raw`]
1578 - [`sync::Weak::into_raw`]
1579 - [`char::UNICODE_VERSION`]
1580 - [`Span::resolved_at`]
1581 - [`Span::located_at`]
1582 - [`Span::mixed_site`]
1583 - [`unix::process::CommandExt::arg0`]
1588 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1593 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1594 `~~outdated information~~` becomes "~~outdated information~~".
1595 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1599 - [Trying to self initialize a static value (that is creating a value using
1600 itself) is unsound and now causes a compile error.][71140]
1601 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1602 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1603 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1604 previously undocumented and not intended for public use. Rustdoc still provides
1605 a non-zero exit code on errors.
1606 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1607 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1608 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1609 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1610 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1614 - [Make clippy a git subtree instead of a git submodule][70655]
1615 - [Unify the undo log of all snapshot types][69464]
1617 [71848]: https://github.com/rust-lang/rust/issues/71848/
1618 [73420]: https://github.com/rust-lang/rust/issues/73420/
1619 [72324]: https://github.com/rust-lang/rust/pull/72324/
1620 [71843]: https://github.com/rust-lang/rust/pull/71843/
1621 [71886]: https://github.com/rust-lang/rust/pull/71886/
1622 [72234]: https://github.com/rust-lang/rust/pull/72234/
1623 [72239]: https://github.com/rust-lang/rust/pull/72239/
1624 [72397]: https://github.com/rust-lang/rust/pull/72397/
1625 [72413]: https://github.com/rust-lang/rust/pull/72413/
1626 [72014]: https://github.com/rust-lang/rust/pull/72014/
1627 [72062]: https://github.com/rust-lang/rust/pull/72062/
1628 [72094]: https://github.com/rust-lang/rust/pull/72094/
1629 [72133]: https://github.com/rust-lang/rust/pull/72133/
1630 [67759]: https://github.com/rust-lang/rust/pull/67759/
1631 [71900]: https://github.com/rust-lang/rust/pull/71900/
1632 [71928]: https://github.com/rust-lang/rust/pull/71928/
1633 [71662]: https://github.com/rust-lang/rust/pull/71662/
1634 [71716]: https://github.com/rust-lang/rust/pull/71716/
1635 [71447]: https://github.com/rust-lang/rust/pull/71447/
1636 [71269]: https://github.com/rust-lang/rust/pull/71269/
1637 [71095]: https://github.com/rust-lang/rust/pull/71095/
1638 [71140]: https://github.com/rust-lang/rust/pull/71140/
1639 [70655]: https://github.com/rust-lang/rust/pull/70655/
1640 [70705]: https://github.com/rust-lang/rust/pull/70705/
1641 [69984]: https://github.com/rust-lang/rust/pull/69984/
1642 [69813]: https://github.com/rust-lang/rust/pull/69813/
1643 [69464]: https://github.com/rust-lang/rust/pull/69464/
1644 [68717]: https://github.com/rust-lang/rust/pull/68717/
1645 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1646 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1647 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1648 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1649 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1650 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1651 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1652 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1653 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1654 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1655 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1656 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1657 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1658 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1659 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1660 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1661 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1664 Version 1.44.1 (2020-06-18)
1665 ===========================
1667 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1668 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1669 * [Fix crashes when finding backtrace on macOS.][71397]
1670 * [Clippy applies lint levels into different files.][clippy/5356]
1672 [71397]: https://github.com/rust-lang/rust/issues/71397
1673 [73078]: https://github.com/rust-lang/rust/issues/73078
1674 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1675 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1678 Version 1.44.0 (2020-06-04)
1679 ==========================
1683 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1684 - [Added the `unused_braces` lint.][70081]
1686 **Syntax-only changes**
1688 - [Expansion-driven outline module parsing][69838]
1693 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1698 These are still rejected semantically, so you will likely receive an error but
1699 these changes can be seen and parsed by macros and conditional compilation.
1703 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1704 Additionally when in incremental mode rustc defaults to 256 codegen units.
1705 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1706 a panic is thrown.][67502]
1707 - [Added tier 3\* support for the `aarch64-unknown-none` and
1708 `aarch64-unknown-none-softfloat` targets.][68334]
1709 - [Added tier 3 support for `arm64-apple-tvos` and
1710 `x86_64-apple-tvos` targets.][68191]
1715 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1716 `vec![]` to be able to be used in `const` contexts.
1717 - [`convert::Infallible` now implements `Hash`.][70281]
1718 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1719 a `&mut OsStr`.][70048]
1720 - [Unicode 13 is now supported.][69929]
1721 - [`String` now implements `From<&mut str>`.][69661]
1722 - [`IoSlice` now implements `Copy`.][69403]
1723 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1724 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1725 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1726 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1727 integer types.][69373]
1731 - [`PathBuf::with_capacity`]
1732 - [`PathBuf::capacity`]
1733 - [`PathBuf::clear`]
1734 - [`PathBuf::reserve`]
1735 - [`PathBuf::reserve_exact`]
1736 - [`PathBuf::shrink_to_fit`]
1737 - [`f32::to_int_unchecked`]
1738 - [`f64::to_int_unchecked`]
1739 - [`Layout::align_to`]
1740 - [`Layout::pad_to_align`]
1742 - [`Layout::extend`]
1746 - [Added the `cargo tree` command which will print a tree graph of
1747 your dependencies.][cargo/8062] E.g.
1749 mdbook v0.3.2 (/Users/src/rust/mdbook)
1751 │ ├── html5ever v0.24.0
1753 │ │ │ └── cfg-if v0.1.9
1755 │ │ └── markup5ever v0.9.0
1756 │ │ ├── log v0.4.8 (*)
1758 │ │ │ └── phf_shared v0.7.24
1759 │ │ │ ├── siphasher v0.2.3
1760 │ │ │ └── unicase v1.4.2
1761 │ │ │ [build-dependencies]
1762 │ │ │ └── version_check v0.1.5
1765 You can also display dependencies on multiple versions of the same crate with
1766 `cargo tree -d` (short for `cargo tree --duplicates`).
1770 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1771 the version in the sidebar.][69494]
1775 - [Rustc now correctly generates static libraries on Windows GNU targets with
1776 the `.a` extension, rather than the previous `.lib`.][70937]
1777 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1778 - [The `file_name` property in JSON output of macro errors now points the actual
1779 source file rather than the previous format of `<NAME macros>`.][70969]
1780 **Note:** this may not point to a file that actually exists on the user's system.
1781 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1782 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1783 not allow zero initialization such as `NonZeroU8`.][66059] This was
1784 previously a warning.
1785 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1786 operator has been defined as a saturating operation.][71269] This was previously
1787 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1788 continue using the current behaviour, which may be desirable in rare performance
1789 sensitive situations.
1793 These changes provide no direct user facing benefits, but represent significant
1794 improvements to the internals and overall performance of rustc and
1797 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1798 - [Replace big JS dict with JSON parsing.][71250]
1800 [69373]: https://github.com/rust-lang/rust/pull/69373/
1801 [66059]: https://github.com/rust-lang/rust/pull/66059/
1802 [68191]: https://github.com/rust-lang/rust/pull/68191/
1803 [68899]: https://github.com/rust-lang/rust/pull/68899/
1804 [71147]: https://github.com/rust-lang/rust/pull/71147/
1805 [71250]: https://github.com/rust-lang/rust/pull/71250/
1806 [70937]: https://github.com/rust-lang/rust/pull/70937/
1807 [70969]: https://github.com/rust-lang/rust/pull/70969/
1808 [70632]: https://github.com/rust-lang/rust/pull/70632/
1809 [70281]: https://github.com/rust-lang/rust/pull/70281/
1810 [70345]: https://github.com/rust-lang/rust/pull/70345/
1811 [70048]: https://github.com/rust-lang/rust/pull/70048/
1812 [70081]: https://github.com/rust-lang/rust/pull/70081/
1813 [70156]: https://github.com/rust-lang/rust/pull/70156/
1814 [71269]: https://github.com/rust-lang/rust/pull/71269/
1815 [69838]: https://github.com/rust-lang/rust/pull/69838/
1816 [69929]: https://github.com/rust-lang/rust/pull/69929/
1817 [69661]: https://github.com/rust-lang/rust/pull/69661/
1818 [69778]: https://github.com/rust-lang/rust/pull/69778/
1819 [69494]: https://github.com/rust-lang/rust/pull/69494/
1820 [69403]: https://github.com/rust-lang/rust/pull/69403/
1821 [69033]: https://github.com/rust-lang/rust/pull/69033/
1822 [68692]: https://github.com/rust-lang/rust/pull/68692/
1823 [68334]: https://github.com/rust-lang/rust/pull/68334/
1824 [67502]: https://github.com/rust-lang/rust/pull/67502/
1825 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1826 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1827 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1828 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1829 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1830 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1831 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1832 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1833 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1834 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1835 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1836 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1837 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1840 Version 1.43.1 (2020-05-07)
1841 ===========================
1843 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1844 * [Fixed the stabilization of AVX-512 features.][71473]
1845 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1847 [71430]: https://github.com/rust-lang/rust/pull/71430
1848 [71473]: https://github.com/rust-lang/rust/issues/71473
1849 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1852 Version 1.43.0 (2020-04-23)
1853 ==========================
1857 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1858 the type inferred correctly.][68129]
1859 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1861 **Syntax only changes**
1862 - [Allow `type Foo: Ord` syntactically.][69361]
1863 - [Fuse associated and extern items up to defaultness.][69194]
1864 - [Syntactically allow `self` in all `fn` contexts.][68764]
1865 - [Merge `fn` syntax + cleanup item parsing.][68728]
1866 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1867 For example, you may now write:
1869 macro_rules! mac_trait {
1879 These are still rejected *semantically*, so you will likely receive an error but
1880 these changes can be seen and parsed by macros and
1881 conditional compilation.
1886 - [You can now pass multiple lint flags to rustc to override the previous
1887 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1888 everything in the `unused` lint group except `unused-variables` which
1889 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1890 everything in the `unused` lint group **including** `unused-variables` since
1891 the allow flag is specified before the deny flag (and therefore overridden).
1892 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1893 if they are available on `windows-gnu`.][67429]
1894 - [rustc now buffers errors/warnings printed in JSON.][69227]
1898 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1899 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1900 respectively.][69538] **Note** These conversions are only available when `N`
1902 - [You can now use associated constants on floats and integers directly, rather
1903 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1904 `f32::NAN` with no imports.
1905 - [`u8::is_ascii` is now `const`.][68984]
1906 - [`String` now implements `AsMut<str>`.][68742]
1907 - [Added the `primitive` module to `std` and `core`.][67637] This module
1908 reexports Rust's primitive types. This is mainly useful in macros
1909 where you want avoid these types being shadowed.
1910 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1911 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1915 - [`Once::is_completed`]
1920 - [`iter::once_with`]
1924 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1925 your environment.][cargo/7823]
1926 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1927 executable path when running integration tests or benchmarks.][cargo/7697]
1928 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1929 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1933 - [Certain checks in the `const_err` lint were deemed unrelated to const
1934 evaluation][69185], and have been moved to the `unconditional_panic` and
1935 `arithmetic_overflow` lints.
1940 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1941 has been a warning since 1.36.0.
1942 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1943 led to some instances being accepted, and now correctly emits a hard error.
1945 [69340]: https://github.com/rust-lang/rust/pull/69340
1949 These changes provide no direct user facing benefits, but represent significant
1950 improvements to the internals and overall performance of `rustc` and
1953 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1954 - [Improved how rustc generates drop code.][67332]
1955 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1956 - [traits: preallocate 2 Vecs of known initial size][69022]
1957 - [Avoid exponential behaviour when relating types][68772]
1958 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1959 - [Improve performance of coherence checks][68966]
1960 - [Deduplicate types in the generator witness][68672]
1961 - [Invert control in struct_lint_level.][68725]
1963 [67332]: https://github.com/rust-lang/rust/pull/67332/
1964 [67429]: https://github.com/rust-lang/rust/pull/67429/
1965 [67637]: https://github.com/rust-lang/rust/pull/67637/
1966 [67642]: https://github.com/rust-lang/rust/pull/67642/
1967 [67878]: https://github.com/rust-lang/rust/pull/67878/
1968 [67885]: https://github.com/rust-lang/rust/pull/67885/
1969 [68129]: https://github.com/rust-lang/rust/pull/68129/
1970 [68672]: https://github.com/rust-lang/rust/pull/68672/
1971 [68725]: https://github.com/rust-lang/rust/pull/68725/
1972 [68728]: https://github.com/rust-lang/rust/pull/68728/
1973 [68738]: https://github.com/rust-lang/rust/pull/68738/
1974 [68742]: https://github.com/rust-lang/rust/pull/68742/
1975 [68764]: https://github.com/rust-lang/rust/pull/68764/
1976 [68772]: https://github.com/rust-lang/rust/pull/68772/
1977 [68943]: https://github.com/rust-lang/rust/pull/68943/
1978 [68952]: https://github.com/rust-lang/rust/pull/68952/
1979 [68966]: https://github.com/rust-lang/rust/pull/68966/
1980 [68984]: https://github.com/rust-lang/rust/pull/68984/
1981 [69022]: https://github.com/rust-lang/rust/pull/69022/
1982 [69185]: https://github.com/rust-lang/rust/pull/69185/
1983 [69194]: https://github.com/rust-lang/rust/pull/69194/
1984 [69201]: https://github.com/rust-lang/rust/pull/69201/
1985 [69227]: https://github.com/rust-lang/rust/pull/69227/
1986 [69548]: https://github.com/rust-lang/rust/pull/69548/
1987 [69256]: https://github.com/rust-lang/rust/pull/69256/
1988 [69361]: https://github.com/rust-lang/rust/pull/69361/
1989 [69366]: https://github.com/rust-lang/rust/pull/69366/
1990 [69538]: https://github.com/rust-lang/rust/pull/69538/
1991 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1992 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1993 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1994 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1995 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1996 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1997 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1998 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2001 Version 1.42.0 (2020-03-12)
2002 ==========================
2006 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2008 fn foo(words: &[&str]) {
2010 ["Hello", "World", "!", ..] => println!("Hello World!"),
2011 ["Foo", "Bar", ..] => println!("Baz"),
2012 rest => println!("{:?}", rest),
2016 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2017 that you can create an enum that has the exact layout and ABI of the type
2019 - [You can now use outer attribute procedural macros on inline modules.][64273]
2020 - [There are some *syntax-only* changes:][67131]
2021 - `default` is syntactically allowed before items in `trait` definitions.
2022 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2023 leave out their bodies in favor of `;`.
2024 - Bounds on associated types in `impl`s are now syntactically allowed
2025 (e.g. `type Foo: Ord;`).
2026 - `...` (the C-variadic type) may occur syntactically directly as the type of
2027 any function parameter.
2029 These are still rejected *semantically*, so you will likely receive an error
2030 but these changes can be seen and parsed by procedural macros and
2031 conditional compilation.
2035 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2036 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2037 - [`Option::{expect,unwrap}` and
2038 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2039 pointing to the location where they were called, rather than
2040 `core`'s internals. ][67887]
2042 \* Refer to Rust's [platform support page][platform-support-doc] for more
2043 information on Rust's tiered platform support.
2047 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2048 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2049 to implement `Sized`.][67935]
2050 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2051 - [`Layout::new` is now `const`.][66254]
2052 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2057 - [`CondVar::wait_while`]
2058 - [`CondVar::wait_timeout_while`]
2060 - [`DebugMap::value`]
2061 - [`ManuallyDrop::take`]
2063 - [`ptr::slice_from_raw_parts_mut`]
2064 - [`ptr::slice_from_raw_parts`]
2068 - [You no longer need to include `extern crate proc_macro;` to be able to
2069 `use proc_macro;` in the `2018` edition.][cargo/7700]
2073 - [`Error::description` has been deprecated, and its use will now produce a
2074 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2076 [68253]: https://github.com/rust-lang/rust/pull/68253/
2077 [68348]: https://github.com/rust-lang/rust/pull/68348/
2078 [67935]: https://github.com/rust-lang/rust/pull/67935/
2079 [68339]: https://github.com/rust-lang/rust/pull/68339/
2080 [68122]: https://github.com/rust-lang/rust/pull/68122/
2081 [64273]: https://github.com/rust-lang/rust/pull/64273/
2082 [67712]: https://github.com/rust-lang/rust/pull/67712/
2083 [67887]: https://github.com/rust-lang/rust/pull/67887/
2084 [67131]: https://github.com/rust-lang/rust/pull/67131/
2085 [67233]: https://github.com/rust-lang/rust/pull/67233/
2086 [66899]: https://github.com/rust-lang/rust/pull/66899/
2087 [66919]: https://github.com/rust-lang/rust/pull/66919/
2088 [66254]: https://github.com/rust-lang/rust/pull/66254/
2089 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2090 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2091 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2092 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2093 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2094 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2095 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2096 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2097 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2100 Version 1.41.1 (2020-02-27)
2101 ===========================
2103 * [Always check types of static items][69145]
2104 * [Always check lifetime bounds of `Copy` impls][69145]
2105 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2107 [69225]: https://github.com/rust-lang/rust/issues/69225
2108 [69145]: https://github.com/rust-lang/rust/pull/69145
2111 Version 1.41.0 (2020-01-30)
2112 ===========================
2117 - [You can now pass type parameters to foreign items when implementing
2118 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2119 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2120 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2121 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2122 - [You can now use any valid identifier in a `format_args` macro.][66847]
2123 Previously identifiers starting with an underscore were not allowed.
2124 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2125 enum variants.][66183] These are still rejected semantically, but
2126 can be seen and parsed by procedural macros and conditional compilation.
2131 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2132 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2133 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2134 - [You can now pass an arguments file passing the `@path` syntax
2135 to rustc.][66172] Note that the format differs somewhat from what is
2136 found in other tooling; please see [the documentation][argfile-docs] for
2138 - [You can now provide `--extern` flag without a path, indicating that it is
2139 available from the search path or specified with an `-L` flag.][64882]
2141 \* Refer to Rust's [platform support page][platform-support-doc] for more
2142 information on Rust's tiered platform support.
2144 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2149 - [The `core::panic` module is now stable.][66771] It was already stable
2151 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2152 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2153 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2158 - [`Result::map_or`]
2159 - [`Result::map_or_else`]
2160 - [`std::rc::Weak::weak_count`]
2161 - [`std::rc::Weak::strong_count`]
2162 - [`std::sync::Weak::weak_count`]
2163 - [`std::sync::Weak::strong_count`]
2168 - [Cargo will now document all the private items for binary crates
2169 by default.][cargo/7593]
2170 - [`cargo-install` will now reinstall the package if it detects that it is out
2171 of date.][cargo/7560]
2172 - [Cargo.lock now uses a more git friendly format that should help to reduce
2173 merge conflicts.][cargo/7579]
2174 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2175 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2176 optimisation level to `2` for debug builds. You can also use
2177 `[profile.<profile>.build-override]` to override build scripts and
2183 - [You can now specify `edition` in documentation code blocks to compile the block
2184 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2185 should be compiled the 2018 edition of Rust.
2186 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2187 current theme with `--check-theme`.][54733]
2188 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2193 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2194 Apple targets.][apple-32bit-drop] This means that the source code is still
2195 available to build, but the targets are no longer being tested and release
2196 binaries for those platforms will no longer be distributed by the Rust project.
2197 Please refer to the linked blog post for more information.
2199 [54733]: https://github.com/rust-lang/rust/pull/54733/
2200 [61351]: https://github.com/rust-lang/rust/pull/61351/
2201 [67255]: https://github.com/rust-lang/rust/pull/67255/
2202 [66661]: https://github.com/rust-lang/rust/pull/66661/
2203 [66771]: https://github.com/rust-lang/rust/pull/66771/
2204 [66847]: https://github.com/rust-lang/rust/pull/66847/
2205 [66238]: https://github.com/rust-lang/rust/pull/66238/
2206 [66277]: https://github.com/rust-lang/rust/pull/66277/
2207 [66325]: https://github.com/rust-lang/rust/pull/66325/
2208 [66172]: https://github.com/rust-lang/rust/pull/66172/
2209 [66183]: https://github.com/rust-lang/rust/pull/66183/
2210 [65879]: https://github.com/rust-lang/rust/pull/65879/
2211 [65013]: https://github.com/rust-lang/rust/pull/65013/
2212 [64882]: https://github.com/rust-lang/rust/pull/64882/
2213 [64325]: https://github.com/rust-lang/rust/pull/64325/
2214 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2215 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2216 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2217 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2218 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2219 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2220 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2221 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2222 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2223 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2224 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2226 Version 1.40.0 (2019-12-19)
2227 ===========================
2231 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2232 `const` contexts.][65188] e.g.
2235 pub struct Point(i32, i32);
2237 const ORIGIN: Point = {
2238 let constructor = Point;
2244 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2245 indicate that there may be variants or fields added in the future.][64639]
2246 For example this requires adding a wild-card branch (`_ => {}`) to any match
2247 statements on a non-exhaustive `enum`. [(RFC 2008)]
2248 - [You can now use function-like procedural macros in `extern` blocks and in
2249 type positions.][63931] e.g. `type Generated = macro!();`
2250 - [Function-like and attribute procedural macros can now emit
2251 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2252 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2253 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2254 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2258 - [Added tier 3 support\* for the
2259 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2260 - [Added tier 3 support for the
2261 `aarch64-unknown-none-softfloat` target.][64589]
2262 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2263 `mips64el-unknown-linux-muslabi64` targets.][65843]
2265 \* Refer to Rust's [platform support page][platform-support-doc] for more
2266 information on Rust's tiered platform support.
2270 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2274 - [`BTreeMap::get_key_value`]
2275 - [`HashMap::get_key_value`]
2276 - [`Option::as_deref_mut`]
2277 - [`Option::as_deref`]
2278 - [`Option::flatten`]
2279 - [`UdpSocket::peer_addr`]
2280 - [`f32::to_be_bytes`]
2281 - [`f32::to_le_bytes`]
2282 - [`f32::to_ne_bytes`]
2283 - [`f64::to_be_bytes`]
2284 - [`f64::to_le_bytes`]
2285 - [`f64::to_ne_bytes`]
2286 - [`f32::from_be_bytes`]
2287 - [`f32::from_le_bytes`]
2288 - [`f32::from_ne_bytes`]
2289 - [`f64::from_be_bytes`]
2290 - [`f64::from_le_bytes`]
2291 - [`f64::from_ne_bytes`]
2298 - [Cargo will now always display warnings, rather than only on
2299 fresh builds.][cargo/7450]
2300 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2301 now produce an error.][cargo/7507] Previously these flags were ignored.
2302 - [You can now publish `dev-dependencies` without including
2303 a `version`.][cargo/7333]
2307 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2308 when running documentation tests with `rustdoc`.][63803]
2312 - [As previously announced, any previous NLL warnings in the 2015 edition are
2313 now hard errors.][64221]
2314 - [The `include!` macro will now warn if it failed to include the
2315 entire file.][64284] The `include!` macro unintentionally only includes the
2316 first _expression_ in a file, and this can be unintuitive. This will become
2317 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2318 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2319 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2320 or `extern` blocks now correctly emits a hard error.
2322 [65294]: https://github.com/rust-lang/rust/pull/65294/
2323 [66103]: https://github.com/rust-lang/rust/pull/66103/
2324 [65843]: https://github.com/rust-lang/rust/pull/65843/
2325 [65188]: https://github.com/rust-lang/rust/pull/65188/
2326 [65092]: https://github.com/rust-lang/rust/pull/65092/
2327 [64589]: https://github.com/rust-lang/rust/pull/64589/
2328 [64639]: https://github.com/rust-lang/rust/pull/64639/
2329 [64221]: https://github.com/rust-lang/rust/pull/64221/
2330 [64284]: https://github.com/rust-lang/rust/pull/64284/
2331 [63931]: https://github.com/rust-lang/rust/pull/63931/
2332 [64035]: https://github.com/rust-lang/rust/pull/64035/
2333 [63674]: https://github.com/rust-lang/rust/pull/63674/
2334 [63803]: https://github.com/rust-lang/rust/pull/63803/
2335 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2336 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2337 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2338 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2339 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2340 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2341 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2342 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2343 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2344 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2345 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2346 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2347 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2348 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2349 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2350 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2351 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2352 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2353 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2354 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2355 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2356 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2357 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2358 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2359 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2360 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2363 Version 1.39.0 (2019-11-07)
2364 ===========================
2368 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2369 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2370 - [You can now use certain attributes on function, closure, and function pointer
2371 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2372 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2373 attributes applied to items. e.g.
2376 #[cfg(windows)] slice: &[u16],
2377 #[cfg(not(windows))] slice: &[u8],
2382 - [You can now take shared references to bind-by-move patterns in the `if` guards
2383 of `match` arms.][63118] e.g.
2386 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2390 // ---- `nums` is bound by move.
2391 if nums.iter().sum::<u8>() == 10
2392 // ^------ `.iter()` implicitly takes a reference to `nums`.
2395 // ----------- Legal as `nums` was bound by move and so we have ownership.
2397 _ => unreachable!(),
2406 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2407 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2408 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2409 **Note** Cargo currently doesn't use this feature. Refer to
2410 [cargo#7315][cargo/7315] to track this feature's progress.
2411 - [You can now pass `--show-output` argument to test binaries to print the
2412 output of successful tests.][62600]
2415 \* Refer to Rust's [platform support page][platform-support-doc] for more
2416 information on Rust's tiered platform support.
2420 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2421 - [`LinkedList::new` is now a `const` function.][63684]
2422 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2423 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2424 now `const`.][63786]
2428 - [`Pin::into_inner`]
2429 - [`Instant::checked_duration_since`]
2430 - [`Instant::saturating_duration_since`]
2434 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2435 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2436 `--all` is now deprecated.
2440 - [You can now pass `-Clinker` to rustdoc to control the linker used
2441 for compiling doctests.][63834]
2445 - [Code that was previously accepted by the old borrow checker, but rejected by
2446 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2447 previously a warning, and will also become a hard error in the Rust 2015
2448 edition in the 1.40.0 release.
2449 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2450 run tests.][63827] This should improve performance when running a large
2452 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2453 recommended to use the `?` operator instead.
2454 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2457 [62600]: https://github.com/rust-lang/rust/pull/62600/
2458 [62672]: https://github.com/rust-lang/rust/pull/62672/
2459 [63118]: https://github.com/rust-lang/rust/pull/63118/
2460 [63209]: https://github.com/rust-lang/rust/pull/63209/
2461 [63402]: https://github.com/rust-lang/rust/pull/63402/
2462 [63565]: https://github.com/rust-lang/rust/pull/63565/
2463 [63595]: https://github.com/rust-lang/rust/pull/63595/
2464 [63684]: https://github.com/rust-lang/rust/pull/63684/
2465 [63698]: https://github.com/rust-lang/rust/pull/63698/
2466 [63770]: https://github.com/rust-lang/rust/pull/63770/
2467 [63786]: https://github.com/rust-lang/rust/pull/63786/
2468 [63827]: https://github.com/rust-lang/rust/pull/63827/
2469 [63834]: https://github.com/rust-lang/rust/pull/63834/
2470 [63927]: https://github.com/rust-lang/rust/pull/63927/
2471 [63933]: https://github.com/rust-lang/rust/pull/63933/
2472 [63934]: https://github.com/rust-lang/rust/pull/63934/
2473 [63938]: https://github.com/rust-lang/rust/pull/63938/
2474 [63940]: https://github.com/rust-lang/rust/pull/63940/
2475 [63941]: https://github.com/rust-lang/rust/pull/63941/
2476 [63945]: https://github.com/rust-lang/rust/pull/63945/
2477 [64010]: https://github.com/rust-lang/rust/pull/64010/
2478 [64028]: https://github.com/rust-lang/rust/pull/64028/
2479 [64334]: https://github.com/rust-lang/rust/pull/64334/
2480 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2481 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2482 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2483 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2484 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2485 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2487 Version 1.38.0 (2019-09-26)
2488 ==========================
2492 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2493 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2497 - [Added pipelined compilation support to `rustc`.][62766] This will
2498 improve compilation times in some cases. For further information please refer
2499 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2500 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2501 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2502 `x86_64-uwp-windows-msvc` targets.][60260]
2503 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2504 `armv7-unknown-linux-musleabi` targets.][63107]
2505 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2506 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2507 - [Upgraded to LLVM 9.][62592]
2509 \* Refer to Rust's [platform support page][platform-support-doc] for more
2510 information on Rust's tiered platform support.
2514 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2515 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2516 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2517 is available at `std::clone::Clone`). This also makes all built-in macros
2518 available in `std`/`core` root. e.g. `std::include_bytes!`.
2519 - [`str::Chars` now implements `Debug`.][63000]
2520 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2521 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2522 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2523 - [Added euclidean remainder and division operations (`div_euclid`,
2524 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2525 `overflowing`, and `wrapping` versions are available for all
2527 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2528 `PartialEq`.][61491]
2529 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2533 - [`<*const T>::cast`]
2534 - [`<*mut T>::cast`]
2535 - [`Duration::as_secs_f32`]
2536 - [`Duration::as_secs_f64`]
2537 - [`Duration::div_f32`]
2538 - [`Duration::div_f64`]
2539 - [`Duration::from_secs_f32`]
2540 - [`Duration::from_secs_f64`]
2541 - [`Duration::mul_f32`]
2542 - [`Duration::mul_f64`]
2543 - [`any::type_name`]
2547 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2548 - [You can now pass the `--features` option multiple times to enable
2549 multiple features.][cargo/7084]
2554 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2558 - [`rustc` will now warn about some incorrect uses of
2559 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2563 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2565 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2566 issues][62896] with certain crates such as libc.
2568 [60260]: https://github.com/rust-lang/rust/pull/60260/
2569 [61457]: https://github.com/rust-lang/rust/pull/61457/
2570 [61491]: https://github.com/rust-lang/rust/pull/61491/
2571 [61884]: https://github.com/rust-lang/rust/pull/61884/
2572 [61953]: https://github.com/rust-lang/rust/pull/61953/
2573 [62042]: https://github.com/rust-lang/rust/pull/62042/
2574 [62528]: https://github.com/rust-lang/rust/pull/62528/
2575 [62583]: https://github.com/rust-lang/rust/pull/62583/
2576 [62735]: https://github.com/rust-lang/rust/pull/62735/
2577 [62766]: https://github.com/rust-lang/rust/pull/62766/
2578 [62784]: https://github.com/rust-lang/rust/pull/62784/
2579 [62592]: https://github.com/rust-lang/rust/pull/62592/
2580 [62785]: https://github.com/rust-lang/rust/issues/62785/
2581 [62814]: https://github.com/rust-lang/rust/pull/62814/
2582 [62896]: https://github.com/rust-lang/rust/issues/62896/
2583 [63000]: https://github.com/rust-lang/rust/pull/63000/
2584 [63056]: https://github.com/rust-lang/rust/pull/63056/
2585 [63107]: https://github.com/rust-lang/rust/pull/63107/
2586 [63346]: https://github.com/rust-lang/rust/pull/63346/
2587 [63421]: https://github.com/rust-lang/rust/pull/63421/
2588 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2589 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2590 [63048]: https://github.com/rust-lang/rust/pull/63048
2591 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2592 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2593 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2594 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2595 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2596 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2597 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2598 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2599 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2600 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2601 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2602 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2603 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2605 Version 1.37.0 (2019-08-15)
2606 ==========================
2610 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2611 [`Box`][62228], or an [array][62235] and unused.
2612 - [You can now use the `cfg` and `cfg_attr` attributes on
2613 generic parameters.][61547]
2614 - [You can now use enum variants through type alias.][61682] e.g. You can
2615 write the following:
2617 type MyOption = Option<u8>;
2619 fn increment_or_zero(x: MyOption) -> u8 {
2621 MyOption::Some(y) => y + 1,
2622 MyOption::None => 0,
2626 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2627 `const _: u32 = 5;`.
2628 - [You can now use `#[repr(align(X)]` on enums.][61229]
2629 - [The `?` Kleene macro operator is now available in the
2630 2015 edition.][60932]
2634 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2635 and `-C profile-use` flags.][61268] For more information on how to use profile
2636 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2637 - [The `rust-lldb` wrapper script should now work again.][61827]
2641 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2645 - [`BufReader::buffer`]
2646 - [`BufWriter::buffer`]
2647 - [`Cell::from_mut`]
2648 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2649 - [`DoubleEndedIterator::nth_back`]
2651 - [`Wrapping::reverse_bits`]
2652 - [`i128::reverse_bits`]
2653 - [`i16::reverse_bits`]
2654 - [`i32::reverse_bits`]
2655 - [`i64::reverse_bits`]
2656 - [`i8::reverse_bits`]
2657 - [`isize::reverse_bits`]
2658 - [`slice::copy_within`]
2659 - [`u128::reverse_bits`]
2660 - [`u16::reverse_bits`]
2661 - [`u32::reverse_bits`]
2662 - [`u64::reverse_bits`]
2663 - [`u8::reverse_bits`]
2664 - [`usize::reverse_bits`]
2668 - [`Cargo.lock` files are now included by default when publishing executable crates
2669 with executables.][cargo/7026]
2670 - [You can now specify `default-run="foo"` in `[package]` to specify the
2671 default executable to use for `cargo run`.][cargo/7056]
2678 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2679 Please transition your code to using the `..=` syntax for inclusive
2681 - [Using a trait object without the `dyn` will now warn by default.][61203]
2682 Please transition your code to use `dyn Trait` for trait objects instead.
2684 [62228]: https://github.com/rust-lang/rust/pull/62228/
2685 [62235]: https://github.com/rust-lang/rust/pull/62235/
2686 [61802]: https://github.com/rust-lang/rust/pull/61802/
2687 [61827]: https://github.com/rust-lang/rust/pull/61827/
2688 [61547]: https://github.com/rust-lang/rust/pull/61547/
2689 [61682]: https://github.com/rust-lang/rust/pull/61682/
2690 [61268]: https://github.com/rust-lang/rust/pull/61268/
2691 [61342]: https://github.com/rust-lang/rust/pull/61342/
2692 [61347]: https://github.com/rust-lang/rust/pull/61347/
2693 [61100]: https://github.com/rust-lang/rust/pull/61100/
2694 [61203]: https://github.com/rust-lang/rust/pull/61203/
2695 [61229]: https://github.com/rust-lang/rust/pull/61229/
2696 [60932]: https://github.com/rust-lang/rust/pull/60932/
2697 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2698 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2699 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2700 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2701 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2702 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2703 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2704 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2705 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2706 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2707 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2708 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2709 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2710 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2711 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2712 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2713 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2714 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2715 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2716 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2717 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2718 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2719 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2720 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2723 Version 1.36.0 (2019-07-04)
2724 ==========================
2728 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2729 - [The order of traits in trait objects no longer affects the semantics of that
2730 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2731 `dyn fmt::Debug + Send`, where this was previously not the case.
2735 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2736 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2737 - [`mem::needs_drop` is now available as a const fn.][60364]
2738 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2739 - [`String` now implements `BorrowMut<str>`.][60404]
2740 - [`io::Cursor` now implements `Default`.][60234]
2741 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2742 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2743 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2744 environment has access to heap memory allocation.
2745 - [`String` now implements `From<&String>`.][59825]
2746 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2747 return a tuple of each argument when there is multiple arguments.
2748 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2753 - [`VecDeque::rotate_left`]
2754 - [`VecDeque::rotate_right`]
2755 - [`Iterator::copied`]
2757 - [`io::IoSliceMut`]
2758 - [`Read::read_vectored`]
2759 - [`Write::write_vectored`]
2760 - [`str::as_mut_ptr`]
2761 - [`mem::MaybeUninit`]
2762 - [`pointer::align_offset`]
2763 - [`future::Future`]
2765 - [`task::RawWaker`]
2766 - [`task::RawWakerVTable`]
2772 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2773 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2775 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2779 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2786 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2787 longer recommended, and will be deprecated in 1.39.0.
2789 [60318]: https://github.com/rust-lang/rust/pull/60318/
2790 [60364]: https://github.com/rust-lang/rust/pull/60364/
2791 [60370]: https://github.com/rust-lang/rust/pull/60370/
2792 [60404]: https://github.com/rust-lang/rust/pull/60404/
2793 [60234]: https://github.com/rust-lang/rust/pull/60234/
2794 [60244]: https://github.com/rust-lang/rust/pull/60244/
2795 [58623]: https://github.com/rust-lang/rust/pull/58623/
2796 [59648]: https://github.com/rust-lang/rust/pull/59648/
2797 [59675]: https://github.com/rust-lang/rust/pull/59675/
2798 [59825]: https://github.com/rust-lang/rust/pull/59825/
2799 [59826]: https://github.com/rust-lang/rust/pull/59826/
2800 [59445]: https://github.com/rust-lang/rust/pull/59445/
2801 [59114]: https://github.com/rust-lang/rust/pull/59114/
2802 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2803 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2804 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2805 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2806 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2807 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2808 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2809 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2810 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2811 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2812 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2813 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2814 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2815 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2816 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2817 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2818 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2819 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2820 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2821 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2824 Version 1.35.0 (2019-05-23)
2825 ==========================
2829 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2830 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2831 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2833 unsafe fn call_unsafe(func: unsafe fn()) {
2838 unsafe { call_unsafe(|| {}); }
2845 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2846 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2847 - [Added the `wasm32-unknown-wasi` target.][59464]
2852 - [`Thread` will now show its ID in `Debug` output.][59460]
2853 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2854 - [`alloc::System` now implements `Default`.][59451]
2855 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2857 - [`char::{ToLowercase, ToUppercase}` now
2858 implement `ExactSizeIterator`.][58778]
2859 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2860 - [Removed the `Read` trait bounds
2861 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2862 - [You can now call the `dbg!` macro without any parameters to print the file
2863 and line where it is called.][57847]
2864 - [In place ASCII case conversions are now up to 4× faster.][59283]
2865 e.g. `str::make_ascii_lowercase`
2866 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2873 - [`RefCell::replace_with`]
2874 - [`RefCell::map_split`]
2876 - [`Range::contains`]
2877 - [`RangeFrom::contains`]
2878 - [`RangeTo::contains`]
2879 - [`RangeInclusive::contains`]
2880 - [`RangeToInclusive::contains`]
2881 - [`Option::copied`]
2885 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2886 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2891 - [The Rust toolchain is now available natively for musl based distros.][58575]
2893 [59460]: https://github.com/rust-lang/rust/pull/59460/
2894 [59464]: https://github.com/rust-lang/rust/pull/59464/
2895 [59500]: https://github.com/rust-lang/rust/pull/59500/
2896 [59512]: https://github.com/rust-lang/rust/pull/59512/
2897 [59580]: https://github.com/rust-lang/rust/pull/59580/
2898 [59283]: https://github.com/rust-lang/rust/pull/59283/
2899 [59451]: https://github.com/rust-lang/rust/pull/59451/
2900 [59076]: https://github.com/rust-lang/rust/pull/59076/
2901 [58778]: https://github.com/rust-lang/rust/pull/58778/
2902 [58717]: https://github.com/rust-lang/rust/pull/58717/
2903 [58369]: https://github.com/rust-lang/rust/pull/58369/
2904 [58423]: https://github.com/rust-lang/rust/pull/58423/
2905 [58080]: https://github.com/rust-lang/rust/pull/58080/
2906 [57847]: https://github.com/rust-lang/rust/pull/57847/
2907 [58575]: https://github.com/rust-lang/rust/pull/58575
2908 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2909 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2910 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2911 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2912 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2913 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2914 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2915 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2916 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2917 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2918 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2919 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2921 Version 1.34.2 (2019-05-14)
2922 ===========================
2924 * [Destabilize the `Error::type_id` function due to a security
2925 vulnerability][60785] ([CVE-2019-12083])
2927 [60785]: https://github.com/rust-lang/rust/pull/60785
2928 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2930 Version 1.34.1 (2019-04-25)
2931 ===========================
2933 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2934 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2935 * [Fix Clippy panic when checking some macros][clippy/3805]
2937 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2938 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2939 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2941 Version 1.34.0 (2019-04-11)
2942 ==========================
2946 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2947 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2949 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2950 `#[attr{}]` procedural macros.][57367]
2951 - [You can now write `extern crate self as foo;`][57407] to import your
2952 crate's root into the extern prelude.
2957 - [You can now target `riscv64imac-unknown-none-elf` and
2958 `riscv64gc-unknown-none-elf`.][58406]
2959 - [You can now enable linker plugin LTO optimisations with
2960 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2961 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2963 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2968 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2969 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2970 the `Hash` trait to create an iterator.
2971 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2972 methods.][58421] Most notably you no longer require the `Ord` trait to create
2974 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2975 for all numeric types.][58044]
2976 - [Indexing a `str` is now generic over all types that
2977 implement `SliceIndex<str>`.][57604]
2978 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2979 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2980 produce a warning if their returning type is unused.
2981 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2982 `overflowing_pow` are now available for all numeric types.][57873] These are
2983 equivalent to methods such as `wrapping_add` for the `pow` operation.
2991 * [`Error::type_id`]
2992 * [`atomic::AtomicI16`]
2993 * [`atomic::AtomicI32`]
2994 * [`atomic::AtomicI64`]
2995 * [`atomic::AtomicI8`]
2996 * [`atomic::AtomicU16`]
2997 * [`atomic::AtomicU32`]
2998 * [`atomic::AtomicU64`]
2999 * [`atomic::AtomicU8`]
3000 * [`convert::Infallible`]
3001 * [`convert::TryFrom`]
3002 * [`convert::TryInto`]
3004 * [`iter::successors`]
3005 * [`num::NonZeroI128`]
3006 * [`num::NonZeroI16`]
3007 * [`num::NonZeroI32`]
3008 * [`num::NonZeroI64`]
3009 * [`num::NonZeroI8`]
3010 * [`num::NonZeroIsize`]
3011 * [`slice::sort_by_cached_key`]
3012 * [`str::escape_debug`]
3013 * [`str::escape_default`]
3014 * [`str::escape_unicode`]
3015 * [`str::split_ascii_whitespace`]
3018 * [`Instant::checked_add`]
3019 * [`Instant::checked_sub`]
3020 * [`SystemTime::checked_add`]
3021 * [`SystemTime::checked_sub`]
3025 - [You can now use alternative registries to crates.io.][cargo/6654]
3029 - [You can now use the `?` operator in your documentation tests without manually
3030 adding `fn main() -> Result<(), _> {}`.][56470]
3034 - [`Command::before_exec` is being replaced by the unsafe method
3035 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3036 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3037 can now use `const` functions in `static` variables.
3039 [58370]: https://github.com/rust-lang/rust/pull/58370/
3040 [58406]: https://github.com/rust-lang/rust/pull/58406/
3041 [58421]: https://github.com/rust-lang/rust/pull/58421/
3042 [58166]: https://github.com/rust-lang/rust/pull/58166/
3043 [58044]: https://github.com/rust-lang/rust/pull/58044/
3044 [58057]: https://github.com/rust-lang/rust/pull/58057/
3045 [58059]: https://github.com/rust-lang/rust/pull/58059/
3046 [57809]: https://github.com/rust-lang/rust/pull/57809/
3047 [57873]: https://github.com/rust-lang/rust/pull/57873/
3048 [57604]: https://github.com/rust-lang/rust/pull/57604/
3049 [57367]: https://github.com/rust-lang/rust/pull/57367/
3050 [57407]: https://github.com/rust-lang/rust/pull/57407/
3051 [57425]: https://github.com/rust-lang/rust/pull/57425/
3052 [57106]: https://github.com/rust-lang/rust/pull/57106/
3053 [56470]: https://github.com/rust-lang/rust/pull/56470/
3054 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3055 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3056 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3057 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3058 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3059 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3060 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3061 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3062 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3063 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3064 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3065 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3066 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3067 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3068 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3069 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3070 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3071 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3072 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3073 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3074 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3075 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3076 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3077 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3078 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3079 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3080 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3081 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3082 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3083 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3084 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3087 Version 1.33.0 (2019-02-28)
3088 ==========================
3092 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3093 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3094 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3095 E.g. You can have match statement on a `u8` that covers `0..=255` and
3096 you would no longer be required to have a `_ => unreachable!()` case.
3097 - [You can now have multiple patterns in `if let` and `while let`
3098 expressions.][57532] You can do this with the same syntax as a `match`
3108 let state = Creature::Crab("Ferris");
3110 if let Creature::Crab(name) | Creature::Person(name) = state {
3111 println!("This creature's name is: {}", name);
3115 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3116 this feature will by default produce a warning as this behaviour can be
3117 unintuitive. E.g. `if let _ = 5 {}`
3118 - [You can now use `let` bindings, assignments, expression statements,
3119 and irrefutable pattern destructuring in const functions.][57175]
3120 - [You can now call unsafe const functions.][57067] E.g.
3122 const unsafe fn foo() -> i32 { 5 }
3123 const fn bar() -> i32 {
3127 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3128 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3129 - [You can now specify a specific alignment with the `#[repr(packed)]`
3130 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3131 with an alignment of 2 bytes and a size of 6 bytes.
3132 - [You can now import an item from a module as an `_`.][56303] This allows you to
3133 import a trait's impls, and not have the name in the namespace. E.g.
3135 use std::io::Read as _;
3137 // Allowed as there is only one `Read` in the module.
3140 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3144 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3145 command line argument.][56351]
3146 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3147 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3148 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3149 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3150 information on Rust's platform support.
3151 - [Added support for the `thumbv7neon-linux-androideabi` and
3152 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3153 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3157 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3158 functions for all numeric types.][57566]
3159 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3160 are now `const` functions for all numeric types.][57105]
3161 - [The methods `is_positive` and `is_negative` are now `const` functions for
3162 all signed numeric types.][57105]
3163 - [The `get` method for all `NonZero` types is now `const`.][57167]
3164 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3165 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3166 numeric types.][57234]
3167 - [`Ipv4Addr::new` is now a `const` function][57234]
3171 - [`unix::FileExt::read_exact_at`]
3172 - [`unix::FileExt::write_all_at`]
3173 - [`Option::transpose`]
3174 - [`Result::transpose`]
3175 - [`convert::identity`]
3178 - [`marker::PhantomPinned`]
3179 - [`Vec::resize_with`]
3180 - [`VecDeque::resize_with`]
3181 - [`Duration::as_millis`]
3182 - [`Duration::as_micros`]
3183 - [`Duration::as_nanos`]
3188 - [You can now publish crates that require a feature flag to compile with
3189 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3190 - [Cargo should now rebuild a crate if a file was modified during the initial
3195 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3196 are now deprecated in the standard library, and their usage will now produce a warning.
3197 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3199 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3201 - [Libtest no longer creates a new thread for each test when
3202 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3204 [55982]: https://github.com/rust-lang/rust/pull/55982/
3205 [56243]: https://github.com/rust-lang/rust/pull/56243
3206 [56303]: https://github.com/rust-lang/rust/pull/56303/
3207 [56351]: https://github.com/rust-lang/rust/pull/56351/
3208 [56362]: https://github.com/rust-lang/rust/pull/56362
3209 [56642]: https://github.com/rust-lang/rust/pull/56642/
3210 [56769]: https://github.com/rust-lang/rust/pull/56769/
3211 [56805]: https://github.com/rust-lang/rust/pull/56805
3212 [56947]: https://github.com/rust-lang/rust/pull/56947/
3213 [57049]: https://github.com/rust-lang/rust/pull/57049/
3214 [57067]: https://github.com/rust-lang/rust/pull/57067/
3215 [57105]: https://github.com/rust-lang/rust/pull/57105
3216 [57130]: https://github.com/rust-lang/rust/pull/57130/
3217 [57167]: https://github.com/rust-lang/rust/pull/57167/
3218 [57175]: https://github.com/rust-lang/rust/pull/57175/
3219 [57234]: https://github.com/rust-lang/rust/pull/57234/
3220 [57332]: https://github.com/rust-lang/rust/pull/57332/
3221 [57465]: https://github.com/rust-lang/rust/pull/57465/
3222 [57532]: https://github.com/rust-lang/rust/pull/57532/
3223 [57535]: https://github.com/rust-lang/rust/pull/57535/
3224 [57566]: https://github.com/rust-lang/rust/pull/57566/
3225 [57615]: https://github.com/rust-lang/rust/pull/57615/
3226 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3227 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3228 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3229 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3230 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3231 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3232 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3233 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3234 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3235 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3236 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3237 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3238 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3239 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3240 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3241 [platform-support]: https://forge.rust-lang.org/platform-support.html
3243 Version 1.32.0 (2019-01-17)
3244 ==========================
3249 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3250 operator allows you to specify zero or one repetitions similar to the `*` and
3252 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3253 now always resolve to the item (`enum`, `struct`, etc.) available in the
3254 module if present, before resolving to a external crate or an item the prelude.][56759]
3257 enum Color { Red, Green, Blue }
3263 - [You can now match against `PhantomData<T>` types.][55837]
3264 - [You can now match against literals in macros with the `literal`
3265 specifier.][56072] This will match against a literal of any type.
3266 E.g. `1`, `'A'`, `"Hello World"`
3267 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3269 struct Point(i32, i32);
3272 pub fn new(x: i32, y: i32) -> Self {
3276 pub fn is_origin(&self) -> bool {
3284 - [Self can also now be used in type definitions.][56366] E.g.
3288 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3291 Cons(T, Box<Self>) // likewise here
3294 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3295 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3299 - [The default allocator has changed from jemalloc to the default allocator on
3300 your system.][55238] The compiler itself on Linux & macOS will still use
3301 jemalloc, but programs compiled with it will use the system allocator.
3302 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3306 - [`PathBuf` now implements `FromStr`.][55148]
3307 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3308 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3309 easily debug expressions in your rust program. E.g.
3312 let b = dbg!(a * 2) + 1;
3313 // ^-- prints: [src/main.rs:4] a * 2 = 4
3317 The following APIs are now `const` functions and can be used in a
3321 - [`UnsafeCell::get`]
3322 - [`char::is_ascii`]
3324 - [`ManuallyDrop::new`]
3325 - [`ManuallyDrop::into_inner`]
3326 - [`RangeInclusive::start`]
3327 - [`RangeInclusive::end`]
3328 - [`NonNull::as_ptr`]
3331 - [`Duration::as_secs`]
3332 - [`Duration::subsec_millis`]
3333 - [`Duration::subsec_micros`]
3334 - [`Duration::subsec_nanos`]
3336 - [`Ipv4Addr::is_unspecified`]
3338 - [`Ipv6Addr::octets`]
3342 - [`i8::to_be_bytes`]
3343 - [`i8::to_le_bytes`]
3344 - [`i8::to_ne_bytes`]
3345 - [`i8::from_be_bytes`]
3346 - [`i8::from_le_bytes`]
3347 - [`i8::from_ne_bytes`]
3348 - [`i16::to_be_bytes`]
3349 - [`i16::to_le_bytes`]
3350 - [`i16::to_ne_bytes`]
3351 - [`i16::from_be_bytes`]
3352 - [`i16::from_le_bytes`]
3353 - [`i16::from_ne_bytes`]
3354 - [`i32::to_be_bytes`]
3355 - [`i32::to_le_bytes`]
3356 - [`i32::to_ne_bytes`]
3357 - [`i32::from_be_bytes`]
3358 - [`i32::from_le_bytes`]
3359 - [`i32::from_ne_bytes`]
3360 - [`i64::to_be_bytes`]
3361 - [`i64::to_le_bytes`]
3362 - [`i64::to_ne_bytes`]
3363 - [`i64::from_be_bytes`]
3364 - [`i64::from_le_bytes`]
3365 - [`i64::from_ne_bytes`]
3366 - [`i128::to_be_bytes`]
3367 - [`i128::to_le_bytes`]
3368 - [`i128::to_ne_bytes`]
3369 - [`i128::from_be_bytes`]
3370 - [`i128::from_le_bytes`]
3371 - [`i128::from_ne_bytes`]
3372 - [`isize::to_be_bytes`]
3373 - [`isize::to_le_bytes`]
3374 - [`isize::to_ne_bytes`]
3375 - [`isize::from_be_bytes`]
3376 - [`isize::from_le_bytes`]
3377 - [`isize::from_ne_bytes`]
3378 - [`u8::to_be_bytes`]
3379 - [`u8::to_le_bytes`]
3380 - [`u8::to_ne_bytes`]
3381 - [`u8::from_be_bytes`]
3382 - [`u8::from_le_bytes`]
3383 - [`u8::from_ne_bytes`]
3384 - [`u16::to_be_bytes`]
3385 - [`u16::to_le_bytes`]
3386 - [`u16::to_ne_bytes`]
3387 - [`u16::from_be_bytes`]
3388 - [`u16::from_le_bytes`]
3389 - [`u16::from_ne_bytes`]
3390 - [`u32::to_be_bytes`]
3391 - [`u32::to_le_bytes`]
3392 - [`u32::to_ne_bytes`]
3393 - [`u32::from_be_bytes`]
3394 - [`u32::from_le_bytes`]
3395 - [`u32::from_ne_bytes`]
3396 - [`u64::to_be_bytes`]
3397 - [`u64::to_le_bytes`]
3398 - [`u64::to_ne_bytes`]
3399 - [`u64::from_be_bytes`]
3400 - [`u64::from_le_bytes`]
3401 - [`u64::from_ne_bytes`]
3402 - [`u128::to_be_bytes`]
3403 - [`u128::to_le_bytes`]
3404 - [`u128::to_ne_bytes`]
3405 - [`u128::from_be_bytes`]
3406 - [`u128::from_le_bytes`]
3407 - [`u128::from_ne_bytes`]
3408 - [`usize::to_be_bytes`]
3409 - [`usize::to_le_bytes`]
3410 - [`usize::to_ne_bytes`]
3411 - [`usize::from_be_bytes`]
3412 - [`usize::from_le_bytes`]
3413 - [`usize::from_ne_bytes`]
3417 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3418 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3422 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3426 - [The argument types for AVX's
3427 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3428 been changed from `*const` to `*mut` as the previous implementation
3432 [55148]: https://github.com/rust-lang/rust/pull/55148/
3433 [55238]: https://github.com/rust-lang/rust/pull/55238/
3434 [55280]: https://github.com/rust-lang/rust/pull/55280/
3435 [55610]: https://github.com/rust-lang/rust/pull/55610/
3436 [55663]: https://github.com/rust-lang/rust/pull/55663/
3437 [55702]: https://github.com/rust-lang/rust/pull/55702/
3438 [55837]: https://github.com/rust-lang/rust/pull/55837/
3439 [55843]: https://github.com/rust-lang/rust/pull/55843/
3440 [56072]: https://github.com/rust-lang/rust/pull/56072/
3441 [56245]: https://github.com/rust-lang/rust/pull/56245/
3442 [56365]: https://github.com/rust-lang/rust/pull/56365/
3443 [56366]: https://github.com/rust-lang/rust/pull/56366/
3444 [56395]: https://github.com/rust-lang/rust/pull/56395/
3445 [56759]: https://github.com/rust-lang/rust/pull/56759/
3446 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3447 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3448 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3449 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3450 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3451 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3452 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3453 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3454 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3455 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3456 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3457 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3458 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3459 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3460 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3461 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3462 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3463 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3464 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3465 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3466 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3467 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3468 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3469 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3470 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3471 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3472 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3473 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3474 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3475 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3476 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3477 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3478 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3479 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3480 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3481 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3482 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3483 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3484 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3485 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3486 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3487 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3488 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3489 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3490 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3491 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3492 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3493 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3494 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3495 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3496 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3497 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3498 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3499 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3500 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3501 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3502 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3503 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3504 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3505 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3506 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3507 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3508 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3509 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3510 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3511 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3512 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3513 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3514 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3515 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3516 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3517 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3518 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3519 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3520 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3521 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3522 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3523 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3524 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3525 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3526 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3527 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3528 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3529 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3530 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3531 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3532 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3533 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3534 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3535 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3536 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3537 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3538 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3541 Version 1.31.1 (2018-12-20)
3542 ===========================
3544 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3545 - [Fix broken go-to-definition in RLS][rls/1171]
3546 - [Fix infinite loop on hover in RLS][rls/1170]
3548 [56562]: https://github.com/rust-lang/rust/pull/56562
3549 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3550 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3552 Version 1.31.0 (2018-12-06)
3553 ==========================
3557 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3558 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3559 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3560 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3562 - [You can now define and use `const` functions.][54835] These are currently
3563 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3564 [language reference][const-reference] for what exactly is available.
3565 - [You can now use tool lints, which allow you to scope lints from external
3566 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3567 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3568 a crate, not just in exported functions.][54451]
3569 - [You can now use parentheses in pattern matches.][54497]
3573 - [Updated musl to 1.1.20][54430]
3577 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3578 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3579 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3580 into `Option<&mut T>` using the `From` trait.][53218]
3581 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3586 - [`slice::align_to`]
3587 - [`slice::align_to_mut`]
3588 - [`slice::chunks_exact`]
3589 - [`slice::chunks_exact_mut`]
3590 - [`slice::rchunks`]
3591 - [`slice::rchunks_mut`]
3592 - [`slice::rchunks_exact`]
3593 - [`slice::rchunks_exact_mut`]
3594 - [`Option::replace`]
3598 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3599 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3600 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3602 [52813]: https://github.com/rust-lang/rust/pull/52813/
3603 [53218]: https://github.com/rust-lang/rust/pull/53218/
3604 [53555]: https://github.com/rust-lang/rust/issues/53555/
3605 [54057]: https://github.com/rust-lang/rust/pull/54057/
3606 [54240]: https://github.com/rust-lang/rust/pull/54240/
3607 [54430]: https://github.com/rust-lang/rust/pull/54430/
3608 [54451]: https://github.com/rust-lang/rust/pull/54451/
3609 [54497]: https://github.com/rust-lang/rust/pull/54497/
3610 [54778]: https://github.com/rust-lang/rust/pull/54778/
3611 [54835]: https://github.com/rust-lang/rust/pull/54835/
3612 [54870]: https://github.com/rust-lang/rust/pull/54870/
3613 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3614 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3615 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3616 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3617 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3618 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3619 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3620 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3621 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3622 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3623 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3624 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3625 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3626 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3628 Version 1.30.1 (2018-11-08)
3629 ===========================
3631 - [Fixed overflow ICE in rustdoc][54199]
3632 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3634 [54199]: https://github.com/rust-lang/rust/pull/54199
3635 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3637 Version 1.30.0 (2018-10-25)
3638 ==========================
3642 - [Procedural macros are now available.][52081] These kinds of macros allow for
3643 more powerful code generation. There is a [new chapter available][proc-macros]
3644 in the Rust Programming Language book that goes further in depth.
3645 - [You can now use keywords as identifiers using the raw identifiers
3646 syntax (`r#`),][53236] e.g. `let r#for = true;`
3647 - [Using anonymous parameters in traits is now deprecated with a warning and
3648 will be a hard error in the 2018 edition.][53272]
3649 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3650 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3651 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3652 Previously, using a external crate in a module without a use statement
3653 required `let json = ::serde_json::from_str(foo);` but can now be written
3654 as `let json = serde_json::from_str(foo);`.
3655 - [You can now apply the `#[used]` attribute to static items to prevent the
3656 compiler from optimising them away, even if they appear to be unused,][51363]
3657 e.g. `#[used] static FOO: u32 = 1;`
3658 - [You can now import and reexport macros from other crates with the `use`
3659 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3660 the root module of the crate. If your macro relies on calling other local
3661 macros, it is recommended to export with the
3662 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3664 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3665 using the `vis` specifier.][53370]
3666 - [Non-macro attributes now allow all forms of literals, not just
3667 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3668 write `#[attr(true)]`.
3669 - [You can now specify a function to handle a panic in the Rust runtime with the
3670 `#[panic_handler]` attribute.][51366]
3674 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3675 - [Added the `aarch64-unknown-netbsd` target][53165]
3676 - [Upgraded to LLVM 8.][53611]
3680 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3684 - [`Ipv4Addr::BROADCAST`]
3685 - [`Ipv4Addr::LOCALHOST`]
3686 - [`Ipv4Addr::UNSPECIFIED`]
3687 - [`Ipv6Addr::LOCALHOST`]
3688 - [`Ipv6Addr::UNSPECIFIED`]
3689 - [`Iterator::find_map`]
3691 The following methods are replacement methods for `trim_left`, `trim_right`,
3692 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3694 - [`str::trim_end_matches`]
3696 - [`str::trim_start_matches`]
3697 - [`str::trim_start`]
3701 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3702 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3703 equivalent to calling `rustdoc --error-format=json`.
3704 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3708 - [`rustdoc` allows you to specify what edition to treat your code as with the
3709 `--edition` option.][54057]
3710 - [`rustdoc` now has the `--color` (specify whether to output color) and
3711 `--error-format` (specify error format, e.g. `json`) options.][53003]
3712 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3713 debug symbols.][53774]
3714 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3715 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3717 [50911]: https://github.com/rust-lang/rust/pull/50911/
3718 [51363]: https://github.com/rust-lang/rust/pull/51363/
3719 [51366]: https://github.com/rust-lang/rust/pull/51366/
3720 [52081]: https://github.com/rust-lang/rust/pull/52081/
3721 [53003]: https://github.com/rust-lang/rust/pull/53003/
3722 [53033]: https://github.com/rust-lang/rust/pull/53033/
3723 [53044]: https://github.com/rust-lang/rust/pull/53044/
3724 [53165]: https://github.com/rust-lang/rust/pull/53165/
3725 [53611]: https://github.com/rust-lang/rust/pull/53611/
3726 [53213]: https://github.com/rust-lang/rust/pull/53213/
3727 [53236]: https://github.com/rust-lang/rust/pull/53236/
3728 [53272]: https://github.com/rust-lang/rust/pull/53272/
3729 [53370]: https://github.com/rust-lang/rust/pull/53370/
3730 [53459]: https://github.com/rust-lang/rust/pull/53459/
3731 [53774]: https://github.com/rust-lang/rust/pull/53774/
3732 [53822]: https://github.com/rust-lang/rust/pull/53822/
3733 [54057]: https://github.com/rust-lang/rust/pull/54057/
3734 [54146]: https://github.com/rust-lang/rust/pull/54146/
3735 [54404]: https://github.com/rust-lang/rust/pull/54404/
3736 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3737 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3738 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3739 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3741 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3742 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3743 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3744 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3745 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3746 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3747 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3748 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3749 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3750 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3753 Version 1.29.2 (2018-10-11)
3754 ===========================
3756 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3757 - The `rls-preview` component on the windows-gnu targets has been restored.
3759 [54639]: https://github.com/rust-lang/rust/pull/54639
3762 Version 1.29.1 (2018-09-25)
3763 ===========================
3768 - The standard library's `str::repeat` function contained an out of bounds write
3769 caused by an integer overflow. This has been fixed by deterministically
3770 panicking when an overflow happens.
3772 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3776 Version 1.29.0 (2018-09-13)
3777 ==========================
3781 - [Bumped minimum LLVM version to 5.0.][51899]
3782 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3783 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3784 - [Upgraded to LLVM 7.][51966]
3788 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3789 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3790 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3791 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3793 - [`Cell<T>` now allows `T` to be unsized.][50494]
3794 - [`SocketAddr` is now stable on Redox.][52656]
3799 - [`Iterator::flatten`]
3804 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3805 `--locked` to disable this behavior.
3806 - [`cargo-install` will now allow you to cross compile an install
3807 using `--target`.][cargo/5614]
3808 - [Added the `cargo-fix` subcommand to automatically move project code from
3809 2015 edition to 2018.][cargo/5723]
3810 - [`cargo doc` can now optionally document private types using the
3811 `--document-private-items` flag.][cargo/5543]
3815 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3816 the specified level to that level.][52354] For example `--cap-lints warn`
3817 will demote `deny` and `forbid` lints to `warn`.
3818 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3819 fails and `101` if there is a panic.][52197]
3820 - [A preview of clippy has been made available through rustup.][51122]
3821 You can install the preview with `rustup component add clippy-preview`.
3825 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3826 Use `str::get_unchecked(begin..end)` instead.
3827 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3828 Consider using the `home_dir` function from
3829 https://crates.io/crates/dirs instead.
3830 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3831 - [`cfg` attributes and `--cfg` command line flags are now more
3832 strictly validated.][53893]
3834 [53893]: https://github.com/rust-lang/rust/pull/53893/
3835 [52861]: https://github.com/rust-lang/rust/pull/52861/
3836 [51966]: https://github.com/rust-lang/rust/pull/51966/
3837 [52656]: https://github.com/rust-lang/rust/pull/52656/
3838 [52239]: https://github.com/rust-lang/rust/pull/52239/
3839 [52330]: https://github.com/rust-lang/rust/pull/52330/
3840 [52354]: https://github.com/rust-lang/rust/pull/52354/
3841 [52402]: https://github.com/rust-lang/rust/pull/52402/
3842 [52103]: https://github.com/rust-lang/rust/pull/52103/
3843 [52197]: https://github.com/rust-lang/rust/pull/52197/
3844 [51807]: https://github.com/rust-lang/rust/pull/51807/
3845 [51899]: https://github.com/rust-lang/rust/pull/51899/
3846 [51912]: https://github.com/rust-lang/rust/pull/51912/
3847 [51511]: https://github.com/rust-lang/rust/pull/51511/
3848 [51619]: https://github.com/rust-lang/rust/pull/51619/
3849 [51656]: https://github.com/rust-lang/rust/pull/51656/
3850 [51178]: https://github.com/rust-lang/rust/pull/51178/
3851 [51122]: https://github.com/rust-lang/rust/pull/51122
3852 [50494]: https://github.com/rust-lang/rust/pull/50494/
3853 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3854 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3855 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3856 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3857 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3858 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3859 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3862 Version 1.28.0 (2018-08-02)
3863 ===========================
3867 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3868 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3869 the inner type across Foreign Function Interface (FFI) boundaries.
3870 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3871 and can now be used as identifiers.][51196]
3872 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3873 stable.][51241] This will allow users to specify a global allocator for
3875 - [Unit test functions marked with the `#[test]` attribute can now return
3876 `Result<(), E: Debug>` in addition to `()`.][51298]
3877 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3878 allows macros to easily target lifetimes.
3882 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3883 prioritise making smaller binary sizes. `z` is the same as `s` with the
3884 exception that it does not vectorise loops, which typically results in an even
3886 - [The short error format is now stable.][49546] Specified with
3887 `--error-format=short` this option will provide a more compressed output of
3888 rust error messages.
3889 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3890 - [Reduced the number of allocations in the macro parser.][50855] This can
3891 improve compile times of macro heavy crates on average by 5%.
3895 - [Implemented `Default` for `&mut str`.][51306]
3896 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3897 - [Implemented `Extend` for `()`.][50234]
3898 - [The `Debug` implementation of `time::Duration` should now be more easily
3899 human readable.][50364] Previously a `Duration` of one second would printed as
3900 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3901 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3902 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3903 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3904 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3905 for `PathBuf`.][50170]
3906 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3907 and `Wrapping<i128>`.][50465]
3908 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3909 possible.][51050] This can provide up to a 40% speed increase.
3910 - [Improved error messages when using `format!`.][50610]
3914 - [`Iterator::step_by`]
3915 - [`Path::ancestors`]
3916 - [`SystemTime::UNIX_EPOCH`]
3917 - [`alloc::GlobalAlloc`]
3919 - [`alloc::LayoutErr`]
3922 - [`alloc::alloc_zeroed`]
3923 - [`alloc::dealloc`]
3924 - [`alloc::realloc`]
3925 - [`alloc::handle_alloc_error`]
3926 - [`btree_map::Entry::or_default`]
3927 - [`fmt::Alignment`]
3928 - [`hash_map::Entry::or_default`]
3929 - [`iter::repeat_with`]
3930 - [`num::NonZeroUsize`]
3931 - [`num::NonZeroU128`]
3932 - [`num::NonZeroU16`]
3933 - [`num::NonZeroU32`]
3934 - [`num::NonZeroU64`]
3935 - [`num::NonZeroU8`]
3936 - [`ops::RangeBounds`]
3937 - [`slice::SliceIndex`]
3938 - [`slice::from_mut`]
3939 - [`slice::from_ref`]
3940 - [`{Any + Send + Sync}::downcast_mut`]
3941 - [`{Any + Send + Sync}::downcast_ref`]
3942 - [`{Any + Send + Sync}::is`]
3946 - [Cargo will now no longer allow you to publish crates with build scripts that
3947 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3948 considered to be immutable.
3952 - [The `suggestion_applicability` field in `rustc`'s json output is now
3953 stable.][50486] This will allow dev tools to check whether a code suggestion
3954 would apply to them.
3958 - [Rust will consider trait objects with duplicated constraints to be the same
3959 type as without the duplicated constraint.][51276] For example the below code will
3960 now fail to compile.
3965 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3968 impl Trait + Send + Send {
3969 fn test(&self) { println!("two"); }
3973 [49546]: https://github.com/rust-lang/rust/pull/49546/
3974 [50143]: https://github.com/rust-lang/rust/pull/50143/
3975 [50170]: https://github.com/rust-lang/rust/pull/50170/
3976 [50234]: https://github.com/rust-lang/rust/pull/50234/
3977 [50265]: https://github.com/rust-lang/rust/pull/50265/
3978 [50364]: https://github.com/rust-lang/rust/pull/50364/
3979 [50385]: https://github.com/rust-lang/rust/pull/50385/
3980 [50465]: https://github.com/rust-lang/rust/pull/50465/
3981 [50486]: https://github.com/rust-lang/rust/pull/50486/
3982 [50554]: https://github.com/rust-lang/rust/pull/50554/
3983 [50610]: https://github.com/rust-lang/rust/pull/50610/
3984 [50855]: https://github.com/rust-lang/rust/pull/50855/
3985 [51050]: https://github.com/rust-lang/rust/pull/51050/
3986 [51196]: https://github.com/rust-lang/rust/pull/51196/
3987 [51200]: https://github.com/rust-lang/rust/pull/51200/
3988 [51241]: https://github.com/rust-lang/rust/pull/51241/
3989 [51276]: https://github.com/rust-lang/rust/pull/51276/
3990 [51298]: https://github.com/rust-lang/rust/pull/51298/
3991 [51306]: https://github.com/rust-lang/rust/pull/51306/
3992 [51562]: https://github.com/rust-lang/rust/pull/51562/
3993 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3994 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3995 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3996 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3997 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3998 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3999 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4000 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4001 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4002 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4003 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4004 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4005 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4006 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4007 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4008 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4009 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4010 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4011 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4012 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4013 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4014 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4015 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4016 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4017 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4018 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4019 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4020 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4021 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4022 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4024 Version 1.27.2 (2018-07-20)
4025 ===========================
4030 - The borrow checker was fixed to avoid potential unsoundness when using
4031 match ergonomics: [#52213][52213].
4033 [52213]: https://github.com/rust-lang/rust/issues/52213
4035 Version 1.27.1 (2018-07-10)
4036 ===========================
4041 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4042 when running, which enabled executing code as some other user on a
4043 given machine. This release fixes that vulnerability; you can read
4044 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4046 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4051 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4052 match ergonomics: [#51415][51415], [#49534][49534].
4054 [51415]: https://github.com/rust-lang/rust/issues/51415
4055 [49534]: https://github.com/rust-lang/rust/issues/49534
4056 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4057 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4059 Version 1.27.0 (2018-06-21)
4060 ==========================
4064 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4065 be used as an identifier.
4066 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4067 bare `Trait` syntax, and should make it clearer when being used in tandem with
4068 `impl Trait` because it is equivalent to the following syntax:
4069 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4070 `Box<Trait> == Box<dyn Trait>`.
4071 - [Attributes on generic parameters such as types and lifetimes are
4072 now stable.][48851] e.g.
4073 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4074 - [The `#[must_use]` attribute can now also be used on functions as well as
4075 types.][48925] It provides a lint that by default warns users when the
4076 value returned by a function has not been used.
4080 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4084 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4085 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4086 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4087 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4088 the `cfg` attribute.
4089 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4090 std are now available in core.][49896]
4091 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4093 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4094 that the operation isn't done in place.
4095 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4096 the `#[must_use]` attribute][49533] to warn about unused potentially
4097 expensive allocations.
4101 - [`DoubleEndedIterator::rfind`]
4102 - [`DoubleEndedIterator::rfold`]
4103 - [`DoubleEndedIterator::try_rfold`]
4104 - [`Duration::from_micros`]
4105 - [`Duration::from_nanos`]
4106 - [`Duration::subsec_micros`]
4107 - [`Duration::subsec_millis`]
4108 - [`HashMap::remove_entry`]
4109 - [`Iterator::try_fold`]
4110 - [`Iterator::try_for_each`]
4112 - [`Option::filter`]
4113 - [`String::replace_range`]
4114 - [`Take::set_limit`]
4115 - [`hint::unreachable_unchecked`]
4116 - [`os::unix::process::parent_id`]
4117 - [`ptr::swap_nonoverlapping`]
4118 - [`slice::rsplit_mut`]
4120 - [`slice::swap_with_slice`]
4124 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4125 `readme`, and `repository` fields.][cargo/5386]
4126 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4127 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4128 a different directory than `target` for placing compilation artifacts.
4129 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4130 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4131 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4132 where cargo would infer a binary, Cargo will produce a warning. You can
4133 disable this feature ahead of time by setting any of the following to false:
4134 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4135 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4136 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4140 - [Added “The Rustc book” into the official documentation.][49707]
4141 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4142 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4146 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4147 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4148 compile, `"".is_empty()` will still compile.
4149 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4150 will only print the inner type.][48553] E.g.
4151 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4152 not `AtomicBool(true)`.
4153 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4154 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4155 alignment should cover all use cases.
4156 - The `.description()` method on the `std::error::Error` trait
4157 [has been soft-deprecated][50163]. It is no longer required to implement it.
4159 [48553]: https://github.com/rust-lang/rust/pull/48553/
4160 [48851]: https://github.com/rust-lang/rust/pull/48851/
4161 [48925]: https://github.com/rust-lang/rust/pull/48925/
4162 [49533]: https://github.com/rust-lang/rust/pull/49533/
4163 [49623]: https://github.com/rust-lang/rust/pull/49623/
4164 [49630]: https://github.com/rust-lang/rust/pull/49630/
4165 [49664]: https://github.com/rust-lang/rust/pull/49664/
4166 [49699]: https://github.com/rust-lang/rust/pull/49699/
4167 [49707]: https://github.com/rust-lang/rust/pull/49707/
4168 [49719]: https://github.com/rust-lang/rust/pull/49719/
4169 [49896]: https://github.com/rust-lang/rust/pull/49896/
4170 [49968]: https://github.com/rust-lang/rust/pull/49968/
4171 [50163]: https://github.com/rust-lang/rust/pull/50163
4172 [50177]: https://github.com/rust-lang/rust/pull/50177/
4173 [50378]: https://github.com/rust-lang/rust/pull/50378/
4174 [50398]: https://github.com/rust-lang/rust/pull/50398/
4175 [50423]: https://github.com/rust-lang/rust/pull/50423/
4176 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4177 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4178 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4179 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4180 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4181 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4182 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4183 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4184 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4185 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4186 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4187 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4188 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4189 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4190 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4191 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4192 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4193 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4194 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4195 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4196 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4197 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4198 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4199 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4200 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4201 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4202 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4203 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4204 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4205 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4208 Version 1.26.2 (2018-06-05)
4209 ==========================
4214 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4216 [51117]: https://github.com/rust-lang/rust/issues/51117
4219 Version 1.26.1 (2018-05-29)
4220 ==========================
4225 - [RLS now works on Windows.][50646]
4226 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4232 - [`fn main() -> impl Trait` no longer works for non-Termination
4234 This reverts an accidental stabilization.
4235 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4236 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4238 [50646]: https://github.com/rust-lang/rust/issues/50646
4239 [50656]: https://github.com/rust-lang/rust/pull/50656
4240 [50812]: https://github.com/rust-lang/rust/pull/50812
4241 [50950]: https://github.com/rust-lang/rust/issues/50950
4242 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4244 Version 1.26.0 (2018-05-10)
4245 ==========================
4249 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4250 implement either or both traits.][49299]
4251 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4252 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4253 lifetime can be elided.][49458]
4254 - [`impl Trait` is now stable allowing you to have abstract types in returns
4255 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4256 `fn open(path: impl AsRef<Path>)`.
4257 - [Pattern matching will now automatically apply dereferences.][49394]
4258 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4259 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4260 - [A lot of operations are now available in a const context.][46882] E.g. You
4261 can now index into constant arrays, reference and dereference into constants,
4262 and use tuple struct constructors.
4263 - [Fixed entry slice patterns are now stable.][48516] E.g.
4265 let points = [1, 2, 3, 4];
4267 [1, 2, 3, 4] => println!("All points were sequential."),
4268 _ => println!("Not all points were sequential."),
4275 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4276 - [Fixed exponential projection complexity on nested types.][48296]
4277 This can provide up to a ~12% reduction in compile times for certain crates.
4278 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4279 to remap path prefixes outputted by the compiler.
4280 - [Added `powerpc-unknown-netbsd` target.][48281]
4284 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4285 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4286 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4287 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4288 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4289 - [`ascii::escape_default` is now available in libcore.][48735]
4290 - [Trailing commas are now supported in std and core macros.][48056]
4291 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4292 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4297 - [`*const T::copy_to_nonoverlapping`]
4298 - [`*const T::copy_to`]
4299 - [`*const T::read_unaligned`]
4300 - [`*const T::read_volatile`]
4301 - [`*const T::read`]
4303 - [`*const T::wrapping_add`]
4304 - [`*const T::wrapping_sub`]
4306 - [`*mut T::copy_to_nonoverlapping`]
4307 - [`*mut T::copy_to`]
4308 - [`*mut T::read_unaligned`]
4309 - [`*mut T::read_volatile`]
4311 - [`*mut T::replace`]
4314 - [`*mut T::wrapping_add`]
4315 - [`*mut T::wrapping_sub`]
4316 - [`*mut T::write_bytes`]
4317 - [`*mut T::write_unaligned`]
4318 - [`*mut T::write_volatile`]
4321 - [`FromUtf8Error::as_bytes`]
4322 - [`LocalKey::try_with`]
4323 - [`Option::cloned`]
4324 - [`btree_map::Entry::and_modify`]
4325 - [`fs::read_to_string`]
4328 - [`hash_map::Entry::and_modify`]
4329 - [`iter::FusedIterator`]
4330 - [`ops::RangeInclusive`]
4331 - [`ops::RangeToInclusive`]
4333 - [`slice::rotate_left`]
4334 - [`slice::rotate_right`]
4335 - [`String::retain`]
4340 - [Cargo will now output path to custom commands when `-v` is
4341 passed with `--list`][cargo/5041]
4342 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4346 - [The second edition of "The Rust Programming Language" book is now recommended
4347 over the first.][48404]
4352 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4353 syntax is now invalid.
4355 use std::ops::Fn as dyn;
4356 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4358 - [The result of dereferences are no longer promoted to `'static`.][47408]
4362 const PAIR: &(i32, i32) = &(0, 1);
4363 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4366 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4367 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4369 - [Removed hoedown from rustdoc.][48274]
4370 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4372 [46882]: https://github.com/rust-lang/rust/pull/46882
4373 [47379]: https://github.com/rust-lang/rust/pull/47379
4374 [47408]: https://github.com/rust-lang/rust/pull/47408
4375 [47813]: https://github.com/rust-lang/rust/pull/47813
4376 [48056]: https://github.com/rust-lang/rust/pull/48056
4377 [48125]: https://github.com/rust-lang/rust/pull/48125
4378 [48166]: https://github.com/rust-lang/rust/pull/48166
4379 [48235]: https://github.com/rust-lang/rust/pull/48235
4380 [48274]: https://github.com/rust-lang/rust/pull/48274
4381 [48281]: https://github.com/rust-lang/rust/pull/48281
4382 [48296]: https://github.com/rust-lang/rust/pull/48296
4383 [48326]: https://github.com/rust-lang/rust/pull/48326
4384 [48359]: https://github.com/rust-lang/rust/pull/48359
4385 [48404]: https://github.com/rust-lang/rust/pull/48404
4386 [48481]: https://github.com/rust-lang/rust/pull/48481
4387 [48516]: https://github.com/rust-lang/rust/pull/48516
4388 [48628]: https://github.com/rust-lang/rust/pull/48628
4389 [48629]: https://github.com/rust-lang/rust/pull/48629
4390 [48657]: https://github.com/rust-lang/rust/pull/48657
4391 [48735]: https://github.com/rust-lang/rust/pull/48735
4392 [48978]: https://github.com/rust-lang/rust/pull/48978
4393 [49101]: https://github.com/rust-lang/rust/pull/49101
4394 [49109]: https://github.com/rust-lang/rust/pull/49109
4395 [49121]: https://github.com/rust-lang/rust/pull/49121
4396 [49162]: https://github.com/rust-lang/rust/pull/49162
4397 [49184]: https://github.com/rust-lang/rust/pull/49184
4398 [49234]: https://github.com/rust-lang/rust/pull/49234
4399 [49255]: https://github.com/rust-lang/rust/pull/49255
4400 [49299]: https://github.com/rust-lang/rust/pull/49299
4401 [49305]: https://github.com/rust-lang/rust/pull/49305
4402 [49394]: https://github.com/rust-lang/rust/pull/49394
4403 [49458]: https://github.com/rust-lang/rust/pull/49458
4404 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4405 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4406 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4407 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4408 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4409 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4410 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4411 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4412 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4413 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4414 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4415 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4416 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4417 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4418 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4419 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4420 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4421 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4422 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4423 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4424 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4425 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4426 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4427 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4428 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4429 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4430 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4431 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4432 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4433 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4434 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4435 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4436 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4437 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4438 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4439 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4440 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4441 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4442 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4443 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4444 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4445 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4448 Version 1.25.0 (2018-03-29)
4449 ==========================
4453 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4454 - [You can now use nested groups of imports.][47948]
4455 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4456 - [You can now have `|` at the start of a match arm.][47947] e.g.
4458 enum Foo { A, B, C }
4464 | Foo::B => println!("AB"),
4465 | Foo::C => println!("C"),
4472 - [Upgraded to LLVM 6.][47828]
4473 - [Added `-C lto=val` option.][47521]
4474 - [Added `i586-unknown-linux-musl` target][47282]
4478 - [Impl Send for `process::Command` on Unix.][47760]
4479 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4480 - [`UnsafeCell::into_inner` is now safe.][47204]
4481 - [Implement libstd for CloudABI.][47268]
4482 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4483 - [Implement `AsRef<Path>` for Component][46985]
4484 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4485 - [Moved `Duration` to libcore.][46666]
4489 - [`Location::column`]
4492 The following functions can now be used in a constant expression.
4493 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4494 - [`Duration::new`][47300]
4495 - [`Duration::from_secs`][47300]
4496 - [`Duration::from_millis`][47300]
4500 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4501 - [`cargo new` now defaults to creating a binary crate, instead of a
4502 library crate.][cargo/5029]
4506 - [Rust by example is now shipped with new releases][46196]
4510 - [Deprecated `net::lookup_host`.][47510]
4511 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4512 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4513 around indexing operations (see [#47349][47349]). This has been fixed (which also
4514 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4515 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4517 [33903]: https://github.com/rust-lang/rust/pull/33903
4518 [47947]: https://github.com/rust-lang/rust/pull/47947
4519 [47948]: https://github.com/rust-lang/rust/pull/47948
4520 [47760]: https://github.com/rust-lang/rust/pull/47760
4521 [47790]: https://github.com/rust-lang/rust/pull/47790
4522 [47828]: https://github.com/rust-lang/rust/pull/47828
4523 [47398]: https://github.com/rust-lang/rust/pull/47398
4524 [47510]: https://github.com/rust-lang/rust/pull/47510
4525 [47521]: https://github.com/rust-lang/rust/pull/47521
4526 [47204]: https://github.com/rust-lang/rust/pull/47204
4527 [47251]: https://github.com/rust-lang/rust/pull/47251
4528 [47268]: https://github.com/rust-lang/rust/pull/47268
4529 [47282]: https://github.com/rust-lang/rust/pull/47282
4530 [47300]: https://github.com/rust-lang/rust/pull/47300
4531 [47349]: https://github.com/rust-lang/rust/pull/47349
4532 [46931]: https://github.com/rust-lang/rust/pull/46931
4533 [46985]: https://github.com/rust-lang/rust/pull/46985
4534 [47006]: https://github.com/rust-lang/rust/pull/47006
4535 [46830]: https://github.com/rust-lang/rust/pull/46830
4536 [46095]: https://github.com/rust-lang/rust/pull/46095
4537 [46666]: https://github.com/rust-lang/rust/pull/46666
4538 [46196]: https://github.com/rust-lang/rust/pull/46196
4539 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4540 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4541 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4542 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4543 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4546 Version 1.24.1 (2018-03-01)
4547 ==========================
4549 - [Do not abort when unwinding through FFI][48251]
4550 - [Emit UTF-16 files for linker arguments on Windows][48318]
4551 - [Make the error index generator work again][48308]
4552 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4554 [48251]: https://github.com/rust-lang/rust/issues/48251
4555 [48308]: https://github.com/rust-lang/rust/issues/48308
4556 [48318]: https://github.com/rust-lang/rust/issues/48318
4557 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4560 Version 1.24.0 (2018-02-15)
4561 ==========================
4565 - [External `sysv64` ffi is now available.][46528]
4566 eg. `extern "sysv64" fn foo () {}`
4570 - [rustc now uses 16 codegen units by default for release builds.][46910]
4571 For the fastest builds, utilize `codegen-units=1`.
4572 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4573 - [Add `aarch64-unknown-openbsd` support][46760]
4577 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4578 improvement in performance in the majority of cases.
4579 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4580 with Windows.][46798]
4581 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4582 - [impl `From<bool>` for `AtomicBool`][46293]
4583 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4584 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4585 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4586 - [float::from_bits now just uses transmute.][46012] This provides
4587 some optimisations from LLVM.
4588 - [Copied `AsciiExt` methods onto `char`][46077]
4589 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4590 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4591 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4592 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4596 - [`RefCell::replace`]
4598 - [`atomic::spin_loop_hint`]
4600 The following functions can now be used in a constant expression.
4601 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4603 - [`AtomicBool::new`][46287]
4604 - [`AtomicUsize::new`][46287]
4605 - [`AtomicIsize::new`][46287]
4606 - [`AtomicPtr::new`][46287]
4607 - [`Cell::new`][46287]
4608 - [`{integer}::min_value`][46287]
4609 - [`{integer}::max_value`][46287]
4610 - [`mem::size_of`][46287]
4611 - [`mem::align_of`][46287]
4612 - [`ptr::null`][46287]
4613 - [`ptr::null_mut`][46287]
4614 - [`RefCell::new`][46287]
4615 - [`UnsafeCell::new`][46287]
4619 - [Added a `workspace.default-members` config that
4620 overrides implied `--all` in virtual workspaces.][cargo/4743]
4621 - [Enable incremental by default on development builds.][cargo/4817] Also added
4622 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4623 per-project or global basis respectively.
4630 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4631 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4632 in accordance with IETF RFC 4291 §2.2.
4633 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4634 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4635 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4636 - [Leading zeros in tuple struct members is now an error][47084]
4637 - [`column!()` macro is one-based instead of zero-based][46977]
4638 - [`fmt::Arguments` can no longer be shared across threads][45198]
4639 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4640 - [Cargo sets a different working directory for the compiler][cargo/4788]
4642 [44884]: https://github.com/rust-lang/rust/pull/44884
4643 [45198]: https://github.com/rust-lang/rust/pull/45198
4644 [45506]: https://github.com/rust-lang/rust/pull/45506
4645 [45904]: https://github.com/rust-lang/rust/pull/45904
4646 [45990]: https://github.com/rust-lang/rust/pull/45990
4647 [46012]: https://github.com/rust-lang/rust/pull/46012
4648 [46077]: https://github.com/rust-lang/rust/pull/46077
4649 [46094]: https://github.com/rust-lang/rust/pull/46094
4650 [46284]: https://github.com/rust-lang/rust/pull/46284
4651 [46287]: https://github.com/rust-lang/rust/pull/46287
4652 [46293]: https://github.com/rust-lang/rust/pull/46293
4653 [46528]: https://github.com/rust-lang/rust/pull/46528
4654 [46671]: https://github.com/rust-lang/rust/pull/46671
4655 [46713]: https://github.com/rust-lang/rust/pull/46713
4656 [46735]: https://github.com/rust-lang/rust/pull/46735
4657 [46749]: https://github.com/rust-lang/rust/pull/46749
4658 [46760]: https://github.com/rust-lang/rust/pull/46760
4659 [46798]: https://github.com/rust-lang/rust/pull/46798
4660 [46828]: https://github.com/rust-lang/rust/pull/46828
4661 [46831]: https://github.com/rust-lang/rust/pull/46831
4662 [46833]: https://github.com/rust-lang/rust/pull/46833
4663 [46910]: https://github.com/rust-lang/rust/pull/46910
4664 [46977]: https://github.com/rust-lang/rust/pull/46977
4665 [47018]: https://github.com/rust-lang/rust/pull/47018
4666 [47080]: https://github.com/rust-lang/rust/pull/47080
4667 [47084]: https://github.com/rust-lang/rust/pull/47084
4668 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4669 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4670 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4671 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4672 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4673 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4676 Version 1.23.0 (2018-01-04)
4677 ==========================
4681 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4682 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4683 Which should fix some confusing errors in some operations.
4687 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4688 undefined behavior.][45920]
4689 - [rustc now suggests renaming import if names clash.][45660]
4690 - [Display errors/warnings correctly when there are zero-width or
4691 wide characters.][45711]
4692 - [rustc now avoids unnecessary copies of arguments that are
4693 simple bindings][45380] This should improve memory usage on average by 5-10%.
4694 - [Updated musl used to build musl rustc to 1.1.17][45393]
4698 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4699 - [Implement Hash for raw pointers to unsized types][45483]
4700 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4701 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4702 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4703 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4704 and `<*mut T>::as_mut`][44932]
4705 - [Optimized `Thread::{park, unpark}` implementation][45524]
4706 - [Improved `SliceExt::binary_search` performance.][45333]
4707 - [impl `FromIterator<()>` for `()`][45379]
4708 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4716 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4717 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4718 - [Added unit test checking to `cargo check`][cargo/4592]
4719 - [Cargo now lets you install a specific version
4720 using `cargo install --version`][cargo/4637]
4724 - [Releases now ship with the Cargo book documentation.][45692]
4725 - [rustdoc now prints rendering warnings on every run.][45324]
4729 - [Changes have been made to type equality to make it more correct,
4730 in rare cases this could break some code.][45853] [Tracking issue for
4731 further information][45852]
4732 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4733 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4734 Android 9, the minimum supported version is Android 14.
4735 - [Bumped the minimum LLVM to 3.9][45326]
4737 [44042]: https://github.com/rust-lang/rust/pull/44042
4738 [44932]: https://github.com/rust-lang/rust/pull/44932
4739 [45267]: https://github.com/rust-lang/rust/pull/45267
4740 [45324]: https://github.com/rust-lang/rust/pull/45324
4741 [45326]: https://github.com/rust-lang/rust/pull/45326
4742 [45333]: https://github.com/rust-lang/rust/pull/45333
4743 [45379]: https://github.com/rust-lang/rust/pull/45379
4744 [45380]: https://github.com/rust-lang/rust/pull/45380
4745 [45393]: https://github.com/rust-lang/rust/pull/45393
4746 [45435]: https://github.com/rust-lang/rust/pull/45435
4747 [45483]: https://github.com/rust-lang/rust/pull/45483
4748 [45524]: https://github.com/rust-lang/rust/pull/45524
4749 [45571]: https://github.com/rust-lang/rust/pull/45571
4750 [45580]: https://github.com/rust-lang/rust/pull/45580
4751 [45610]: https://github.com/rust-lang/rust/pull/45610
4752 [45660]: https://github.com/rust-lang/rust/pull/45660
4753 [45692]: https://github.com/rust-lang/rust/pull/45692
4754 [45711]: https://github.com/rust-lang/rust/pull/45711
4755 [45772]: https://github.com/rust-lang/rust/pull/45772
4756 [45852]: https://github.com/rust-lang/rust/issues/45852
4757 [45853]: https://github.com/rust-lang/rust/pull/45853
4758 [45887]: https://github.com/rust-lang/rust/pull/45887
4759 [45920]: https://github.com/rust-lang/rust/pull/45920
4760 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4761 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4762 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4765 Version 1.22.1 (2017-11-22)
4766 ==========================
4768 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4770 [46183]: https://github.com/rust-lang/rust/pull/46183
4772 Version 1.22.0 (2017-11-22)
4773 ==========================
4777 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4778 - [Now accepts underscores in unicode escapes][43716]
4779 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4780 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4784 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4785 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4786 This should decrease compile times for debug builds.
4787 - [strict memory alignment now enabled on ARMv6][45094]
4788 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4792 - [Allow atomic operations up to 32 bits
4793 on `armv5te_unknown_linux_gnueabi`][44978]
4794 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4795 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4796 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4797 - [Properly detect overflow in `Instant += Duration`.][44220]
4798 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4799 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4800 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4807 - [Cargo will now build multi file examples in subdirectories of the `examples`
4808 folder that have a `main.rs` file.][cargo/4496]
4809 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4810 the old format will continue to work and can be updated with `cargo update`.
4811 - [Now supports vendoring git repositories][cargo/3992]
4815 - [`libbacktrace` is now available on Apple platforms.][44251]
4816 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4817 This now lets you specify that a given code example will fail to compile.
4821 - [The minimum Android version that rustc can build for has been bumped
4822 to `4.0` from `2.3`][45656]
4823 - [Allowing `T op= &T` for numeric types has broken some type
4824 inference cases][45480]
4827 [42526]: https://github.com/rust-lang/rust/pull/42526
4828 [43017]: https://github.com/rust-lang/rust/pull/43017
4829 [43716]: https://github.com/rust-lang/rust/pull/43716
4830 [43949]: https://github.com/rust-lang/rust/pull/43949
4831 [44015]: https://github.com/rust-lang/rust/pull/44015
4832 [44220]: https://github.com/rust-lang/rust/pull/44220
4833 [44251]: https://github.com/rust-lang/rust/pull/44251
4834 [44287]: https://github.com/rust-lang/rust/pull/44287
4835 [44303]: https://github.com/rust-lang/rust/pull/44303
4836 [44456]: https://github.com/rust-lang/rust/pull/44456
4837 [44466]: https://github.com/rust-lang/rust/pull/44466
4838 [44895]: https://github.com/rust-lang/rust/pull/44895
4839 [44966]: https://github.com/rust-lang/rust/pull/44966
4840 [44978]: https://github.com/rust-lang/rust/pull/44978
4841 [45041]: https://github.com/rust-lang/rust/pull/45041
4842 [45064]: https://github.com/rust-lang/rust/pull/45064
4843 [45075]: https://github.com/rust-lang/rust/pull/45075
4844 [45094]: https://github.com/rust-lang/rust/pull/45094
4845 [45095]: https://github.com/rust-lang/rust/pull/45095
4846 [45480]: https://github.com/rust-lang/rust/issues/45480
4847 [45656]: https://github.com/rust-lang/rust/pull/45656
4848 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4849 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4850 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4857 Version 1.21.0 (2017-10-12)
4858 ==========================
4862 - [You can now use static references for literals.][43838]
4866 let x: &'static u32 = &0;
4869 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4872 my_macro!(Vec<i32>::new); // Always worked
4873 my_macro!(Vec::<i32>::new); // Now works
4878 - [Upgraded jemalloc to 4.5.0][43911]
4879 - [Enabled unwinding panics on Redox][43917]
4880 - [Now runs LLVM in parallel during translation phase.][43506]
4881 This should reduce peak memory usage.
4885 - [Generate builtin impls for `Clone` for all arrays and tuples that
4886 are `T: Clone`][43690]
4887 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4888 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4889 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4894 [`std::mem::discriminant`]
4898 - [You can now call `cargo install` with multiple package names][cargo/4216]
4899 - [Cargo commands inside a virtual workspace will now implicitly
4900 pass `--all`][cargo/4335]
4901 - [Added a `[patch]` section to `Cargo.toml` to handle
4902 prepublication dependencies][cargo/4123] [RFC 1969]
4903 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4904 like patterns][cargo/4270]
4905 - [Added the `--all-targets` option][cargo/4400]
4906 - [Using required dependencies as a feature is now deprecated and emits
4907 a warning][cargo/4364]
4912 - [Cargo docs are moving][43916]
4913 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4914 - [The rustdoc book is now available][43863]
4915 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4916 - [Added a preview of RLS has been made available through rustup][44204]
4917 Install with `rustup component add rls-preview`
4918 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4919 Previously only showed `std::os::unix`.
4923 - [Changes in method matching against higher-ranked types][43880] This may cause
4924 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4925 - [rustc's JSON error output's byte position start at top of file.][42973]
4926 Was previously relative to the rustc's internal `CodeMap` struct which
4927 required the unstable library `libsyntax` to correctly use.
4928 - [`unused_results` lint no longer ignores booleans][43728]
4930 [42565]: https://github.com/rust-lang/rust/pull/42565
4931 [42973]: https://github.com/rust-lang/rust/pull/42973
4932 [43348]: https://github.com/rust-lang/rust/pull/43348
4933 [43459]: https://github.com/rust-lang/rust/pull/43459
4934 [43506]: https://github.com/rust-lang/rust/pull/43506
4935 [43540]: https://github.com/rust-lang/rust/pull/43540
4936 [43690]: https://github.com/rust-lang/rust/pull/43690
4937 [43728]: https://github.com/rust-lang/rust/pull/43728
4938 [43838]: https://github.com/rust-lang/rust/pull/43838
4939 [43863]: https://github.com/rust-lang/rust/pull/43863
4940 [43880]: https://github.com/rust-lang/rust/pull/43880
4941 [43911]: https://github.com/rust-lang/rust/pull/43911
4942 [43916]: https://github.com/rust-lang/rust/pull/43916
4943 [43917]: https://github.com/rust-lang/rust/pull/43917
4944 [44204]: https://github.com/rust-lang/rust/pull/44204
4945 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4946 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4947 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4948 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4949 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4950 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4951 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4952 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4953 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4955 Version 1.20.0 (2017-08-31)
4956 ===========================
4960 - [Associated constants are now stabilised.][42809]
4961 - [A lot of macro bugs are now fixed.][42913]
4966 - [Struct fields are now properly coerced to the expected field type.][42807]
4967 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4968 `wasm32-experimental-emscripten` target.
4969 - [Changed some of the error messages to be more helpful.][42033]
4970 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4972 - [rustc now reports the total number of errors on compilation failure][43015]
4973 previously this was only the number of errors in the pass that failed.
4974 - [Expansion in rustc has been sped up 29x.][42533]
4975 - [added `msp430-none-elf` target.][43099]
4976 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4978 - [Fixes backtraces on Redox][43228]
4979 - [rustc now identifies different versions of same crate when absolute paths of
4980 different types match in an error message.][42826]
4986 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4987 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4989 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4990 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4991 - [Impl `Clone` for `DefaultHasher`.][42799]
4992 - [Impl `Sync` for `SyncSender`.][42397]
4993 - [Impl `FromStr` for `char`][42271]
4994 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4996 - [allow messages in the `unimplemented!()` macro.][42155]
4997 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4998 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4999 - [Upgrade to Unicode 10.0.0][42999]
5000 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5001 - [Skip the main thread's manual stack guard on Linux][43072]
5002 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
5003 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5005 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5010 - [`CStr::into_c_string`]
5011 - [`CString::as_c_str`]
5012 - [`CString::into_boxed_c_str`]
5013 - [`Chain::get_mut`]
5014 - [`Chain::get_ref`]
5015 - [`Chain::into_inner`]
5016 - [`Option::get_or_insert_with`]
5017 - [`Option::get_or_insert`]
5018 - [`OsStr::into_os_string`]
5019 - [`OsString::into_boxed_os_str`]
5022 - [`Utf8Error::error_len`]
5023 - [`char::EscapeDebug`]
5024 - [`char::escape_debug`]
5025 - [`compile_error!`]
5026 - [`f32::from_bits`]
5028 - [`f64::from_bits`]
5030 - [`mem::ManuallyDrop`]
5031 - [`slice::sort_unstable_by_key`]
5032 - [`slice::sort_unstable_by`]
5033 - [`slice::sort_unstable`]
5034 - [`str::from_boxed_utf8_unchecked`]
5035 - [`str::as_bytes_mut`]
5036 - [`str::as_bytes_mut`]
5037 - [`str::from_utf8_mut`]
5038 - [`str::from_utf8_unchecked_mut`]
5040 - [`str::get_unchecked_mut`]
5041 - [`str::get_unchecked`]
5043 - [`str::into_boxed_bytes`]
5048 - [Cargo API token location moved from `~/.cargo/config` to
5049 `~/.cargo/credentials`.][cargo/3978]
5050 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5051 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5052 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5053 - [You can now specify version of a binary when installed through
5054 `cargo install` using `--vers`.][cargo/4229]
5055 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5056 failure.][cargo/4248]
5057 - [Changed the convention around which file is the crate root.][cargo/4259]
5058 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5059 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5064 - [Functions with `'static` in their return types will now not be as usable as
5065 if they were using lifetime parameters instead.][42417]
5066 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5067 takes the sign of NaN into account where previously didn't.][42430]
5069 [42033]: https://github.com/rust-lang/rust/pull/42033
5070 [42155]: https://github.com/rust-lang/rust/pull/42155
5071 [42271]: https://github.com/rust-lang/rust/pull/42271
5072 [42397]: https://github.com/rust-lang/rust/pull/42397
5073 [42417]: https://github.com/rust-lang/rust/pull/42417
5074 [42430]: https://github.com/rust-lang/rust/pull/42430
5075 [42431]: https://github.com/rust-lang/rust/pull/42431
5076 [42533]: https://github.com/rust-lang/rust/pull/42533
5077 [42571]: https://github.com/rust-lang/rust/pull/42571
5078 [42613]: https://github.com/rust-lang/rust/pull/42613
5079 [42799]: https://github.com/rust-lang/rust/pull/42799
5080 [42807]: https://github.com/rust-lang/rust/pull/42807
5081 [42809]: https://github.com/rust-lang/rust/pull/42809
5082 [42822]: https://github.com/rust-lang/rust/pull/42822
5083 [42826]: https://github.com/rust-lang/rust/pull/42826
5084 [42854]: https://github.com/rust-lang/rust/pull/42854
5085 [42913]: https://github.com/rust-lang/rust/pull/42913
5086 [42999]: https://github.com/rust-lang/rust/pull/42999
5087 [43011]: https://github.com/rust-lang/rust/pull/43011
5088 [43015]: https://github.com/rust-lang/rust/pull/43015
5089 [43072]: https://github.com/rust-lang/rust/pull/43072
5090 [43077]: https://github.com/rust-lang/rust/pull/43077
5091 [43097]: https://github.com/rust-lang/rust/pull/43097
5092 [43099]: https://github.com/rust-lang/rust/pull/43099
5093 [43170]: https://github.com/rust-lang/rust/pull/43170
5094 [43178]: https://github.com/rust-lang/rust/pull/43178
5095 [43185]: https://github.com/rust-lang/rust/pull/43185
5096 [43228]: https://github.com/rust-lang/rust/pull/43228
5097 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5098 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5099 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5100 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5101 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5102 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5103 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5104 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5105 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5106 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5107 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5108 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5109 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5110 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5111 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5112 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5113 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5114 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5115 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5116 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5117 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5118 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5119 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5120 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5121 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5122 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5123 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5124 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5125 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5126 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5127 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5128 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5129 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5130 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5131 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5132 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5133 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5134 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5135 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5138 Version 1.19.0 (2017-07-20)
5139 ===========================
5144 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5145 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5146 - [Macro recursion limit increased to 1024 from 64.][41676]
5147 - [Added lint for detecting unused macros.][41907]
5148 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5149 For example: `let x = loop { break 7; };`
5150 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5151 contain `Copy` types and cannot have a `Drop` implementation.
5152 Example: `union Foo { bar: u8, baz: usize }`
5153 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5154 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5159 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5160 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5161 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5162 you should use `--target armv7-linux-androideabi`.
5163 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5164 - [Minor optimisation of string operations.][42037]
5165 - [Compiler error message is now `aborting due to previous error(s)` instead of
5166 `aborting due to N previous errors`][42150] This was previously inaccurate and
5167 would only count certain kinds of errors.
5168 - [The compiler now supports Visual Studio 2017][42225]
5169 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5170 - [Added a lot][42264] of [new error codes][42302]
5171 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5172 libraries with C Run-time Libraries(CRT) to be statically linked.
5173 - [Fixed various ARM codegen bugs][42740]
5178 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5179 `Extend<Cow<'a, str>>`][41449]
5180 - [`Vec` now implements `From<&mut [T]>`][41530]
5181 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5182 - [`SplitWhitespace` now implements `Clone`][41659]
5183 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5185 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5186 macros, but for printing to stderr.
5191 - [`OsString::shrink_to_fit`]
5194 - [`thread::ThreadId`]
5199 - [Build scripts can now add environment variables to the environment
5200 the crate is being compiled in.
5201 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5202 - [Subcommands now replace the current process rather than spawning a new
5203 child process][cargo/3970]
5204 - [Workspace members can now accept glob file patterns][cargo/3979]
5205 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5206 the members in a given workspace.][cargo/3988]
5207 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5208 - [Target directory path is now in the cargo metadata][cargo/4022]
5209 - [Cargo no longer checks out a local working directory for the
5210 crates.io index][cargo/4026] This should provide smaller file size for the
5211 registry, and improve cloning times, especially on Windows machines.
5212 - [Added an `--exclude` option for excluding certain packages when using the
5213 `--all` option][cargo/4031]
5214 - [Cargo will now automatically retry when receiving a 5xx error
5215 from crates.io][cargo/4032]
5216 - [The `--features` option now accepts multiple comma or space
5217 delimited values.][cargo/4084]
5218 - [Added support for custom target specific runners][cargo/3954]
5223 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5225 - [Rust will now release XZ compressed packages][rust-installer/57]
5226 - [rustup will now prefer to download rust packages with
5227 XZ compression][rustup/1100] over GZip packages.
5228 - [Added the ability to escape `#` in rust documentation][41785] By adding
5229 additional `#`'s ie. `##` is now `#`
5234 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5235 - [`-Z` flags are now no longer allowed to be used on the stable
5236 compiler.][41751] This has been a warning for a year previous to this.
5237 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5238 longer works][42844]. Users should migrate to the built-in `check`
5239 command, which has been available since 1.16.
5240 - [Ending a float literal with `._` is now a hard error.
5241 Example: `42._` .][41946]
5242 - [Any use of a private `extern crate` outside of its module is now a
5243 hard error.][36886] This was previously a warning.
5244 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5245 relative while the `::` prefix makes a path absolute, but was ignored and the
5246 path was relative regardless.
5247 - [Floating point constants in match patterns is now a hard error][36890]
5248 This was previously a warning.
5249 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5250 match patterns is now a hard error][36891] This was previously a warning.
5251 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5253 - [From the pound escape, lines consisting of multiple `#`s are
5255 - [It is an error to re-export private enum variants][42460]. This is
5256 known to break a number of crates that depend on an older version of
5258 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5259 to use it to find the linker, and the build will fail where it did
5260 not previously][42607]
5262 [36886]: https://github.com/rust-lang/rust/issues/36886
5263 [36888]: https://github.com/rust-lang/rust/issues/36888
5264 [36890]: https://github.com/rust-lang/rust/issues/36890
5265 [36891]: https://github.com/rust-lang/rust/issues/36891
5266 [36892]: https://github.com/rust-lang/rust/issues/36892
5267 [37406]: https://github.com/rust-lang/rust/issues/37406
5268 [39983]: https://github.com/rust-lang/rust/pull/39983
5269 [41145]: https://github.com/rust-lang/rust/pull/41145
5270 [41192]: https://github.com/rust-lang/rust/pull/41192
5271 [41258]: https://github.com/rust-lang/rust/pull/41258
5272 [41370]: https://github.com/rust-lang/rust/pull/41370
5273 [41449]: https://github.com/rust-lang/rust/pull/41449
5274 [41530]: https://github.com/rust-lang/rust/pull/41530
5275 [41624]: https://github.com/rust-lang/rust/pull/41624
5276 [41656]: https://github.com/rust-lang/rust/pull/41656
5277 [41659]: https://github.com/rust-lang/rust/pull/41659
5278 [41676]: https://github.com/rust-lang/rust/pull/41676
5279 [41751]: https://github.com/rust-lang/rust/pull/41751
5280 [41764]: https://github.com/rust-lang/rust/pull/41764
5281 [41785]: https://github.com/rust-lang/rust/pull/41785
5282 [41873]: https://github.com/rust-lang/rust/pull/41873
5283 [41907]: https://github.com/rust-lang/rust/pull/41907
5284 [41946]: https://github.com/rust-lang/rust/pull/41946
5285 [42016]: https://github.com/rust-lang/rust/pull/42016
5286 [42037]: https://github.com/rust-lang/rust/pull/42037
5287 [42068]: https://github.com/rust-lang/rust/pull/42068
5288 [42150]: https://github.com/rust-lang/rust/pull/42150
5289 [42162]: https://github.com/rust-lang/rust/pull/42162
5290 [42225]: https://github.com/rust-lang/rust/pull/42225
5291 [42264]: https://github.com/rust-lang/rust/pull/42264
5292 [42302]: https://github.com/rust-lang/rust/pull/42302
5293 [42460]: https://github.com/rust-lang/rust/issues/42460
5294 [42607]: https://github.com/rust-lang/rust/issues/42607
5295 [42740]: https://github.com/rust-lang/rust/pull/42740
5296 [42844]: https://github.com/rust-lang/rust/issues/42844
5297 [42948]: https://github.com/rust-lang/rust/pull/42948
5298 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5299 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5300 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5301 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5302 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5303 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5304 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5305 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5306 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5307 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5308 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5309 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5310 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5311 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5312 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5313 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5314 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5315 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5316 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5317 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5318 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5319 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5322 Version 1.18.0 (2017-06-08)
5323 ===========================
5328 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5329 make the item visible to just that module tree. Also accepts the keyword
5330 `crate` to make something public to the whole crate but not users of the
5331 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5332 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5333 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5334 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5335 types like `Write + Send`, trailing `+` are now supported in trait objects,
5336 and better error reporting for trait objects starting with `?Sized`.
5337 - [0e+10 is now a valid floating point literal][40589]
5338 - [Now warns if you bind a lifetime parameter to 'static][40734]
5339 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5340 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5341 representation in some cases.][40377]
5346 - [rustc can now emit mir with `--emit mir`][39891]
5347 - [Improved LLVM IR for trivial functions][40367]
5348 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5349 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5350 opportunities found through profiling
5351 - [Improved backtrace formatting when panicking][38165]
5356 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5357 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5358 iteration or reallocation.
5359 - [Simplified HashMap Bucket interface][40561] provides performance
5360 improvements for iterating and cloning.
5361 - [Specialize Vec::from_elem to use calloc][40409]
5362 - [Fixed Race condition in fs::create_dir_all][39799]
5363 - [No longer caching stdio on Windows][40516]
5364 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5365 2.50%~ faster and in one case now 12.50% faster.
5366 - [Optimized `AtomicBool::fetch_nand`][41143]
5371 - [`Child::try_wait`]
5372 - [`HashMap::retain`]
5373 - [`HashSet::retain`]
5375 - [`TcpStream::peek`]
5376 - [`UdpSocket::peek`]
5377 - [`UdpSocket::peek_from`]
5382 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5383 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5384 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5385 - [Added Android build support][cargo/3885]
5386 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5387 of a certain type, for example `cargo build --bins` will build all
5389 - [Added support for haiku][cargo/3952]
5394 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5395 - [Added rust-windbg script for better debugging on Windows][39983]
5396 - [Rust now uses the official cross compiler for NetBSD][40612]
5397 - [rustdoc now accepts `#` at the start of files][40828]
5398 - [Fixed jemalloc support for musl][41168]
5403 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5404 always placed after the sign if it exists and before the digits. With the `#`
5405 flag the zeroes are placed after the prefix and before the digits.
5406 - [Due to the struct field optimisation][40377], using `transmute` on structs
5407 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5408 always been undefined behavior, but is now more likely to break in practice.
5409 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5410 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5411 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5412 - [Overlapping inherent `impl`s are now a hard error][40728]
5413 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5414 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5415 `out.asm` and `out.ll` instead of only one of the filetypes.
5416 - [ calling a function that returns `Self` will no longer work][41805] when
5417 the size of `Self` cannot be statically determined.
5418 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5419 this has caused a few regressions namely:
5421 - Changed the link order of local static/dynamic libraries (respecting the
5422 order on given rather than having the compiler reorder).
5423 - Changed how MinGW is linked, native code linked to dynamic libraries
5424 may require manually linking to the gcc support library (for the native
5427 [38165]: https://github.com/rust-lang/rust/pull/38165
5428 [39799]: https://github.com/rust-lang/rust/pull/39799
5429 [39891]: https://github.com/rust-lang/rust/pull/39891
5430 [39983]: https://github.com/rust-lang/rust/pull/39983
5431 [40043]: https://github.com/rust-lang/rust/pull/40043
5432 [40241]: https://github.com/rust-lang/rust/pull/40241
5433 [40338]: https://github.com/rust-lang/rust/pull/40338
5434 [40367]: https://github.com/rust-lang/rust/pull/40367
5435 [40377]: https://github.com/rust-lang/rust/pull/40377
5436 [40409]: https://github.com/rust-lang/rust/pull/40409
5437 [40516]: https://github.com/rust-lang/rust/pull/40516
5438 [40556]: https://github.com/rust-lang/rust/pull/40556
5439 [40561]: https://github.com/rust-lang/rust/pull/40561
5440 [40589]: https://github.com/rust-lang/rust/pull/40589
5441 [40612]: https://github.com/rust-lang/rust/pull/40612
5442 [40723]: https://github.com/rust-lang/rust/pull/40723
5443 [40728]: https://github.com/rust-lang/rust/pull/40728
5444 [40731]: https://github.com/rust-lang/rust/pull/40731
5445 [40734]: https://github.com/rust-lang/rust/pull/40734
5446 [40805]: https://github.com/rust-lang/rust/pull/40805
5447 [40807]: https://github.com/rust-lang/rust/pull/40807
5448 [40828]: https://github.com/rust-lang/rust/pull/40828
5449 [40870]: https://github.com/rust-lang/rust/pull/40870
5450 [41085]: https://github.com/rust-lang/rust/pull/41085
5451 [41143]: https://github.com/rust-lang/rust/pull/41143
5452 [41168]: https://github.com/rust-lang/rust/pull/41168
5453 [41270]: https://github.com/rust-lang/rust/issues/41270
5454 [41469]: https://github.com/rust-lang/rust/pull/41469
5455 [41805]: https://github.com/rust-lang/rust/issues/41805
5456 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5457 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5458 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5459 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5460 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5461 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5462 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5463 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5464 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5465 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5466 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5467 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5468 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5469 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5472 Version 1.17.0 (2017-04-27)
5473 ===========================
5478 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5479 * [Fields of structs may be initialized without duplicating the field/variable
5480 names][39761]. [RFC 1682]
5481 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5482 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5483 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5484 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5485 `'b`. Soundness fix.
5486 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5487 * [Static variables may contain references to other statics][40027]
5492 * [Exit quickly on only `--emit dep-info`][40336]
5493 * [Make `-C relocation-model` more correctly determine whether the linker
5494 creates a position-independent executable][40245]
5495 * [Add `-C overflow-checks` to directly control whether integer overflow
5497 * [The rustc type checker now checks items on demand instead of in a single
5498 in-order pass][40008]. This is mostly an internal refactoring in support of
5499 future work, including incremental type checking, but also resolves [RFC
5500 1647], allowing `Self` to appear in `impl` `where` clauses.
5501 * [Optimize vtable loads][39995]
5502 * [Turn off vectorization for Emscripten targets][39990]
5503 * [Provide suggestions for unknown macros imported with `use`][39953]
5504 * [Fix ICEs in path resolution][39939]
5505 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5506 * [Add clearer error message using `&str + &str`][39116]
5517 * [`Ordering::then`]
5518 * [`Ordering::then_with`]
5519 * [`BTreeMap::range`]
5520 * [`BTreeMap::range_mut`]
5521 * [`collections::Bound`]
5522 * [`process::abort`]
5523 * [`ptr::read_unaligned`]
5524 * [`ptr::write_unaligned`]
5525 * [`Result::expect_err`]
5528 * [`Cell::into_inner`]
5534 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5535 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5536 * [`String` implements `FromIterator<&char>`][40028]
5537 * `Box` [implements][40009] a number of new conversions:
5538 `From<Box<str>> for String`,
5539 `From<Box<[T]>> for Vec<T>`,
5540 `From<Box<CStr>> for CString`,
5541 `From<Box<OsStr>> for OsString`,
5542 `From<Box<Path>> for PathBuf`,
5543 `Into<Box<str>> for String`,
5544 `Into<Box<[T]>> for Vec<T>`,
5545 `Into<Box<CStr>> for CString`,
5546 `Into<Box<OsStr>> for OsString`,
5547 `Into<Box<Path>> for PathBuf`,
5548 `Default for Box<str>`,
5549 `Default for Box<CStr>`,
5550 `Default for Box<OsStr>`,
5551 `From<&CStr> for Box<CStr>`,
5552 `From<&OsStr> for Box<OsStr>`,
5553 `From<&Path> for Box<Path>`
5554 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5555 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5556 * [Slightly optimize `slice::sort`][39538]
5557 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5558 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5559 `Box<str>` implements `From<&str>`][39438]
5560 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5561 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5562 * [`format!` estimates the needed capacity before writing a string][39356]
5563 * [Support unprivileged symlink creation in Windows][38921]
5564 * [`PathBuf` implements `Default`][38764]
5565 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5566 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5567 and poor hash functions.
5572 * [Add `cargo check --all`][cargo/3731]
5573 * [Add an option to ignore SSL revocation checking][cargo/3699]
5574 * [Add `cargo run --package`][cargo/3691]
5575 * [Add `required_features`][cargo/3667]
5576 * [Assume `build.rs` is a build script][cargo/3664]
5577 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5582 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5584 * [The "Unstable Book" documents nightly-only features][ubook]
5585 * [Improve the style of the sidebar in rustdoc output][40265]
5586 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5587 * [Fix MSP430 breakage due to `i128`][40257]
5588 * [Preliminary Solaris/SPARCv9 support][39903]
5589 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5590 run without installing the MSVC runtime.
5591 * [`rustdoc --test` includes file names in test names][39788]
5592 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5593 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5594 * [Initial support for `aarch64-unknown-freebsd`][39491]
5595 * [Initial support for `i686-unknown-netbsd`][39426]
5596 * [This release no longer includes the old makefile build system][39431]. Rust
5597 is built with a custom build system, written in Rust, and with Cargo.
5598 * [Add Debug implementations for libcollection structs][39002]
5599 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5600 * [`--test-threads=0` produces an error][38945]
5601 * [`rustup` installs documentation by default][40526]
5602 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5603 WinDbg and Visual Studio to improve the debugging experience.
5608 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5609 workaround, either use MSVC 2015 or run vcvars.bat.
5610 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5611 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5612 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5614 * [`format!` and `Display::to_string` panic if an underlying formatting
5615 implementation returns an error][40117]. Previously the error was silently
5616 ignored. It is incorrect for `write_fmt` to return an error when writing
5618 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5619 crates were marked stable and could be accessed from the stable toolchain.
5620 * [Rust git source no longer includes vendored crates][39728]. Those that need
5621 to build with vendored crates should build from release tarballs.
5622 * [Fix inert attributes from `proc_macro_derives`][39572]
5623 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5624 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5626 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5627 existing code generally ignores the type of dead-code unless a type-hint is
5628 provided; this can cause surprising inference interactions particularly around
5629 defaulting. The new code uniformly ignores the result type of dead-code.
5630 * [Tuple-struct constructors with private fields are no longer visible][38932]
5631 * [Lifetime parameters that do not appear in the arguments are now considered
5632 early-bound][38897], resolving a soundness bug (#[32330]). The
5633 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5635 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5636 * [Make transmuting from fn item types to pointer-sized types a hard
5639 [27787]: https://github.com/rust-lang/rust/issues/27787
5640 [32330]: https://github.com/rust-lang/rust/issues/32330
5641 [34198]: https://github.com/rust-lang/rust/pull/34198
5642 [38161]: https://github.com/rust-lang/rust/pull/38161
5643 [38368]: https://github.com/rust-lang/rust/pull/38368
5644 [38584]: https://github.com/rust-lang/rust/issues/38584
5645 [38661]: https://github.com/rust-lang/rust/pull/38661
5646 [38764]: https://github.com/rust-lang/rust/pull/38764
5647 [38864]: https://github.com/rust-lang/rust/issues/38864
5648 [38897]: https://github.com/rust-lang/rust/pull/38897
5649 [38921]: https://github.com/rust-lang/rust/pull/38921
5650 [38932]: https://github.com/rust-lang/rust/pull/38932
5651 [38945]: https://github.com/rust-lang/rust/pull/38945
5652 [38981]: https://github.com/rust-lang/rust/pull/38981
5653 [39002]: https://github.com/rust-lang/rust/pull/39002
5654 [39116]: https://github.com/rust-lang/rust/pull/39116
5655 [39193]: https://github.com/rust-lang/rust/pull/39193
5656 [39265]: https://github.com/rust-lang/rust/pull/39265
5657 [39356]: https://github.com/rust-lang/rust/pull/39356
5658 [39372]: https://github.com/rust-lang/rust/pull/39372
5659 [39426]: https://github.com/rust-lang/rust/pull/39426
5660 [39431]: https://github.com/rust-lang/rust/pull/39431
5661 [39438]: https://github.com/rust-lang/rust/pull/39438
5662 [39440]: https://github.com/rust-lang/rust/pull/39440
5663 [39485]: https://github.com/rust-lang/rust/pull/39485
5664 [39491]: https://github.com/rust-lang/rust/pull/39491
5665 [39518]: https://github.com/rust-lang/rust/pull/39518
5666 [39538]: https://github.com/rust-lang/rust/pull/39538
5667 [39572]: https://github.com/rust-lang/rust/pull/39572
5668 [39633]: https://github.com/rust-lang/rust/pull/39633
5669 [39642]: https://github.com/rust-lang/rust/pull/39642
5670 [39728]: https://github.com/rust-lang/rust/pull/39728
5671 [39761]: https://github.com/rust-lang/rust/pull/39761
5672 [39788]: https://github.com/rust-lang/rust/pull/39788
5673 [39793]: https://github.com/rust-lang/rust/pull/39793
5674 [39837]: https://github.com/rust-lang/rust/pull/39837
5675 [39843]: https://github.com/rust-lang/rust/pull/39843
5676 [39851]: https://github.com/rust-lang/rust/pull/39851
5677 [39903]: https://github.com/rust-lang/rust/pull/39903
5678 [39939]: https://github.com/rust-lang/rust/pull/39939
5679 [39953]: https://github.com/rust-lang/rust/pull/39953
5680 [39960]: https://github.com/rust-lang/rust/pull/39960
5681 [39990]: https://github.com/rust-lang/rust/pull/39990
5682 [39995]: https://github.com/rust-lang/rust/pull/39995
5683 [40008]: https://github.com/rust-lang/rust/pull/40008
5684 [40009]: https://github.com/rust-lang/rust/pull/40009
5685 [40027]: https://github.com/rust-lang/rust/pull/40027
5686 [40028]: https://github.com/rust-lang/rust/pull/40028
5687 [40037]: https://github.com/rust-lang/rust/pull/40037
5688 [40117]: https://github.com/rust-lang/rust/pull/40117
5689 [40166]: https://github.com/rust-lang/rust/pull/40166
5690 [40245]: https://github.com/rust-lang/rust/pull/40245
5691 [40257]: https://github.com/rust-lang/rust/pull/40257
5692 [40261]: https://github.com/rust-lang/rust/pull/40261
5693 [40265]: https://github.com/rust-lang/rust/pull/40265
5694 [40319]: https://github.com/rust-lang/rust/pull/40319
5695 [40336]: https://github.com/rust-lang/rust/pull/40336
5696 [40526]: https://github.com/rust-lang/rust/pull/40526
5697 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5698 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5699 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5700 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5701 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5702 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5703 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5704 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5705 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5706 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5707 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5708 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5709 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5710 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5711 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5712 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5713 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5714 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5715 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5716 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5717 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5718 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5719 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5720 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5721 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5722 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5723 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5724 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5725 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5726 [mdbook]: https://crates.io/crates/mdbook
5727 [ubook]: https://doc.rust-lang.org/unstable-book/
5730 Version 1.16.0 (2017-03-16)
5731 ===========================
5736 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5737 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5738 match patterns][38069]
5739 * [Clean up semantics of `self` in an import list][38313]
5740 * [`Self` may appear in `impl` headers][38920]
5741 * [`Self` may appear in struct expressions][39282]
5746 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5747 a `.rmeta` file containing only crate metadata][38571]. This can be
5748 used by tools like the Rust Language Service to perform
5749 metadata-only builds.
5750 * [Levenshtein based typo suggestions now work in most places, while
5751 previously they worked only for fields and sometimes for local
5752 variables][38927]. Together with the overhaul of "no
5753 resolution"/"unexpected resolution" errors (#[38154]) they result in
5754 large and systematic improvement in resolution diagnostics.
5755 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5757 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5758 * [`rustc` no longer attempts to provide "consider using an explicit
5759 lifetime" suggestions][37057]. They were inaccurate.
5764 * [`VecDeque::truncate`]
5765 * [`VecDeque::resize`]
5766 * [`String::insert_str`]
5767 * [`Duration::checked_add`]
5768 * [`Duration::checked_sub`]
5769 * [`Duration::checked_div`]
5770 * [`Duration::checked_mul`]
5773 * [`SocketAddr::is_ipv4`]
5774 * [`SocketAddr::is_ipv6`]
5775 * [`IpAddr::is_ipv4`]
5776 * [`IpAddr::is_ipv6`]
5778 * [`Vec::dedup_by_key`]
5779 * [`Result::unwrap_or_default`]
5780 * [`<*const T>::wrapping_offset`]
5781 * [`<*mut T>::wrapping_offset`]
5782 * `CommandExt::creation_flags`
5783 * [`File::set_permissions`]
5784 * [`String::split_off`]
5789 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5790 their argument by `Borrow` parameter][37761]
5791 * [All public types in std implement `Debug`][38006]
5792 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5793 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5794 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5796 * [std: Fix partial writes in `LineWriter`][38062]
5797 * [std: Clamp max read/write sizes on Unix][38062]
5798 * [Use more specific panic message for `&str` slicing errors][38066]
5799 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5800 functionality cannot be achieved in std currently.
5801 * [`writeln!`, like `println!`, now accepts a form with no string
5802 or formatting arguments, to just print a newline][38469]
5803 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5804 * [Reduce the size of static data in `std_unicode::tables`][38781]
5805 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5806 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5808 * [`Duration` implements `Sum`][38712]
5809 * [`String` implements `ToSocketAddrs`][39048]
5814 * [The `cargo check` command does a type check of a project without
5815 building it][cargo/3296]
5816 * [crates.io will display CI badges from Travis and AppVeyor, if
5817 specified in Cargo.toml][cargo/3546]
5818 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5819 * [Compilation profiles accept integer values for `debug`, in addition
5820 to `true` and `false`. These are passed to `rustc` as the value to
5821 `-C debuginfo`][cargo/3534]
5822 * [Implement `cargo --version --verbose`][cargo/3604]
5823 * [All builds now output 'dep-info' build dependencies compatible with
5824 make and ninja][cargo/3557]
5825 * [Build all workspace members with `build --all`][cargo/3511]
5826 * [Document all workspace members with `doc --all`][cargo/3515]
5827 * [Path deps outside workspace are not members][cargo/3443]
5832 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5833 the path to the Rust implementation][38589]
5834 * [The `armv7-linux-androideabi` target no longer enables NEON
5835 extensions, per Google's ABI guide][38413]
5836 * [The stock standard library can be compiled for Redox OS][38401]
5837 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5839 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5841 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5846 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5847 match patterns][38069]
5848 * In this release, references to uninhabited types can not be
5849 pattern-matched. This was accidentally allowed in 1.15.
5850 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5851 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5853 * [Clean up semantics of `self` in an import list][38313]
5854 * Reimplemented lifetime elision. This change was almost entirely compatible
5855 with existing code, but it did close a number of small bugs and loopholes,
5856 as well as being more accepting in some other [cases][41105].
5858 [37057]: https://github.com/rust-lang/rust/pull/37057
5859 [37761]: https://github.com/rust-lang/rust/pull/37761
5860 [38006]: https://github.com/rust-lang/rust/pull/38006
5861 [38051]: https://github.com/rust-lang/rust/pull/38051
5862 [38062]: https://github.com/rust-lang/rust/pull/38062
5863 [38062]: https://github.com/rust-lang/rust/pull/38622
5864 [38066]: https://github.com/rust-lang/rust/pull/38066
5865 [38069]: https://github.com/rust-lang/rust/pull/38069
5866 [38131]: https://github.com/rust-lang/rust/pull/38131
5867 [38154]: https://github.com/rust-lang/rust/pull/38154
5868 [38274]: https://github.com/rust-lang/rust/pull/38274
5869 [38304]: https://github.com/rust-lang/rust/pull/38304
5870 [38313]: https://github.com/rust-lang/rust/pull/38313
5871 [38314]: https://github.com/rust-lang/rust/pull/38314
5872 [38327]: https://github.com/rust-lang/rust/pull/38327
5873 [38401]: https://github.com/rust-lang/rust/pull/38401
5874 [38413]: https://github.com/rust-lang/rust/pull/38413
5875 [38469]: https://github.com/rust-lang/rust/pull/38469
5876 [38559]: https://github.com/rust-lang/rust/pull/38559
5877 [38571]: https://github.com/rust-lang/rust/pull/38571
5878 [38580]: https://github.com/rust-lang/rust/pull/38580
5879 [38589]: https://github.com/rust-lang/rust/pull/38589
5880 [38670]: https://github.com/rust-lang/rust/pull/38670
5881 [38712]: https://github.com/rust-lang/rust/pull/38712
5882 [38726]: https://github.com/rust-lang/rust/pull/38726
5883 [38781]: https://github.com/rust-lang/rust/pull/38781
5884 [38798]: https://github.com/rust-lang/rust/pull/38798
5885 [38909]: https://github.com/rust-lang/rust/pull/38909
5886 [38920]: https://github.com/rust-lang/rust/pull/38920
5887 [38927]: https://github.com/rust-lang/rust/pull/38927
5888 [39048]: https://github.com/rust-lang/rust/pull/39048
5889 [39282]: https://github.com/rust-lang/rust/pull/39282
5890 [39379]: https://github.com/rust-lang/rust/pull/39379
5891 [41105]: https://github.com/rust-lang/rust/issues/41105
5892 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5893 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5894 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5895 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5896 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5897 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5898 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5899 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5900 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5901 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5902 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5903 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5904 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5905 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5906 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5907 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5908 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5909 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5910 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5911 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5912 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5913 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5914 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5915 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5916 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5917 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5918 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5919 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5920 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5921 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5924 Version 1.15.1 (2017-02-09)
5925 ===========================
5927 * [Fix IntoIter::as_mut_slice's signature][39466]
5928 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5930 [39466]: https://github.com/rust-lang/rust/pull/39466
5931 [39523]: https://github.com/rust-lang/rust/pull/39523
5934 Version 1.15.0 (2017-02-02)
5935 ===========================
5940 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5941 stable. This allows popular code-generating crates like Serde and Diesel to
5942 work ergonomically. [RFC 1681].
5943 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5944 with curly braces][36868]. Part of [RFC 1506].
5945 * [A number of minor changes to name resolution have been activated][37127].
5946 They add up to more consistent semantics, allowing for future evolution of
5947 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5948 details of what is different. The breaking changes here have been transitioned
5949 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5950 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5952 * [`?Sized` can be used in `where` clauses][37791]
5953 * [There is now a limit on the size of monomorphized types and it can be
5954 modified with the `#![type_size_limit]` crate attribute, similarly to
5955 the `#![recursion_limit]` attribute][37789]
5960 * [On Windows, the compiler will apply dllimport attributes when linking to
5961 extern functions][37973]. Additional attributes and flags can control which
5962 library kind is linked and its name. [RFC 1717].
5963 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5964 * [The `--test` flag works with procedural macro crates][38107]
5965 * [Fix `extern "aapcs" fn` ABI][37814]
5966 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5967 * [The `format!` expander recognizes incorrect `printf` and shell-style
5968 formatting directives and suggests the correct format][37613].
5969 * [Only report one error for all unused imports in an import list][37456]
5971 Compiler Performance
5972 --------------------
5974 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5975 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5976 * [Don't clone in `UnificationTable::probe`][37848]
5977 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5978 * [Use small vectors in type walker][37760]
5979 * [Macro expansion performance was improved][37701]
5980 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5981 * [Replace FNV with a faster hash function][37229]
5986 * [`std::iter::Iterator::min_by`]
5987 * [`std::iter::Iterator::max_by`]
5988 * [`std::os::*::fs::FileExt`]
5989 * [`std::sync::atomic::Atomic*::get_mut`]
5990 * [`std::sync::atomic::Atomic*::into_inner`]
5991 * [`std::vec::IntoIter::as_slice`]
5992 * [`std::vec::IntoIter::as_mut_slice`]
5993 * [`std::sync::mpsc::Receiver::try_iter`]
5994 * [`std::os::unix::process::CommandExt::before_exec`]
5995 * [`std::rc::Rc::strong_count`]
5996 * [`std::rc::Rc::weak_count`]
5997 * [`std::sync::Arc::strong_count`]
5998 * [`std::sync::Arc::weak_count`]
5999 * [`std::char::encode_utf8`]
6000 * [`std::char::encode_utf16`]
6001 * [`std::cell::Ref::clone`]
6002 * [`std::io::Take::into_inner`]
6007 * [The standard sorting algorithm has been rewritten for dramatic performance
6008 improvements][38192]. It is a hybrid merge sort, drawing influences from
6009 Timsort. Previously it was a naive merge sort.
6010 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6011 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6013 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6014 and `char_indices().last()`][37882]
6015 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6016 * [Chinese characters display correctly in `fmt::Debug`][37855]
6017 * [Derive `Default` for `Duration`][37699]
6018 * [Support creation of anonymous pipes on WinXP/2k][37677]
6019 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6020 * [Don't pass overlapped handles to processes][38835]
6025 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6026 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6027 should instead check the variable at runtime with `std::env`. That the value
6028 was set at build time was a bug, and incorrect when cross-compiling. This
6029 change is known to cause breakage.
6030 * [Add `--all` flag to `cargo test`][cargo/3221]
6031 * [Compile statically against the MSVC CRT][cargo/3363]
6032 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6033 * [Link OpenSSL statically on OSX][cargo/3311]
6034 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6035 * [Test for bad path overrides with summaries][cargo/3336]
6036 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6037 * [Fix retrying crate downloads for network errors][cargo/3348]
6038 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6039 * [Emit more info on --message-format=json][cargo/3319]
6040 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6041 * [Don't ignore errors in workspace manifest][cargo/3409]
6042 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6047 * [Test runners (binaries built with `--test`) now support a `--list` argument
6048 that lists the tests it contains][38185]
6049 * [Test runners now support a `--exact` argument that makes the test filter
6050 match exactly, instead of matching only a substring of the test name][38181]
6051 * [rustdoc supports a `--playground-url` flag][37763]
6052 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6057 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6058 continue to be used in this release by passing `--disable-rustbuild` to the
6059 configure script, but they will be deleted soon. Note that the new build
6060 system uses a different on-disk layout that will likely affect any scripts
6062 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6064 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6065 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6071 * [A number of minor changes to name resolution have been activated][37127].
6072 They add up to more consistent semantics, allowing for future evolution of
6073 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6074 details of what is different. The breaking changes here have been transitioned
6075 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6076 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6077 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6078 should instead check the variable at runtime with `std::env`. That the value
6079 was set at build time was a bug, and incorrect when cross-compiling. This
6080 change is known to cause breakage.
6081 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6082 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6083 1.10 and is now an error by default. It will become a hard error in the near
6085 * [The semantics relating modules to file system directories are changing in
6086 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6087 lint, which is a warning in this release, and will become a hard error in the
6089 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6090 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6091 the underlying iterator][37834]
6093 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6094 [33685]: https://github.com/rust-lang/rust/issues/33685
6095 [36868]: https://github.com/rust-lang/rust/pull/36868
6096 [37127]: https://github.com/rust-lang/rust/pull/37127
6097 [37229]: https://github.com/rust-lang/rust/pull/37229
6098 [37456]: https://github.com/rust-lang/rust/pull/37456
6099 [37527]: https://github.com/rust-lang/rust/pull/37527
6100 [37602]: https://github.com/rust-lang/rust/pull/37602
6101 [37613]: https://github.com/rust-lang/rust/pull/37613
6102 [37615]: https://github.com/rust-lang/rust/pull/37615
6103 [37636]: https://github.com/rust-lang/rust/pull/37636
6104 [37627]: https://github.com/rust-lang/rust/pull/37627
6105 [37642]: https://github.com/rust-lang/rust/pull/37642
6106 [37677]: https://github.com/rust-lang/rust/pull/37677
6107 [37699]: https://github.com/rust-lang/rust/pull/37699
6108 [37701]: https://github.com/rust-lang/rust/pull/37701
6109 [37705]: https://github.com/rust-lang/rust/pull/37705
6110 [37749]: https://github.com/rust-lang/rust/pull/37749
6111 [37760]: https://github.com/rust-lang/rust/pull/37760
6112 [37763]: https://github.com/rust-lang/rust/pull/37763
6113 [37764]: https://github.com/rust-lang/rust/pull/37764
6114 [37789]: https://github.com/rust-lang/rust/pull/37789
6115 [37791]: https://github.com/rust-lang/rust/pull/37791
6116 [37814]: https://github.com/rust-lang/rust/pull/37814
6117 [37817]: https://github.com/rust-lang/rust/pull/37817
6118 [37834]: https://github.com/rust-lang/rust/pull/37834
6119 [37848]: https://github.com/rust-lang/rust/pull/37848
6120 [37855]: https://github.com/rust-lang/rust/pull/37855
6121 [37882]: https://github.com/rust-lang/rust/pull/37882
6122 [37888]: https://github.com/rust-lang/rust/pull/37888
6123 [37973]: https://github.com/rust-lang/rust/pull/37973
6124 [37979]: https://github.com/rust-lang/rust/pull/37979
6125 [38086]: https://github.com/rust-lang/rust/pull/38086
6126 [38107]: https://github.com/rust-lang/rust/pull/38107
6127 [38117]: https://github.com/rust-lang/rust/pull/38117
6128 [38134]: https://github.com/rust-lang/rust/pull/38134
6129 [38146]: https://github.com/rust-lang/rust/pull/38146
6130 [38181]: https://github.com/rust-lang/rust/pull/38181
6131 [38182]: https://github.com/rust-lang/rust/pull/38182
6132 [38185]: https://github.com/rust-lang/rust/pull/38185
6133 [38192]: https://github.com/rust-lang/rust/pull/38192
6134 [38279]: https://github.com/rust-lang/rust/pull/38279
6135 [38835]: https://github.com/rust-lang/rust/pull/38835
6136 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6137 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6138 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6139 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6140 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6141 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6142 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6143 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6144 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6145 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6146 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6147 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6148 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6149 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6150 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6151 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6152 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6153 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6154 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6155 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6156 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6157 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6158 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6159 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6160 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6161 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6162 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6163 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6164 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6165 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6166 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6167 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6168 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6169 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6170 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6171 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6172 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6173 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6176 Version 1.14.0 (2016-12-22)
6177 ===========================
6182 * [`..` matches multiple tuple fields in enum variants, structs
6183 and tuples][36843]. [RFC 1492].
6184 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6185 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6186 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6187 dereferencing][36822]
6192 * [Mark enums with non-zero discriminant as non-zero][37224]
6193 * [Lower-case `static mut` names are linted like other
6194 statics and consts][37162]
6195 * [Fix ICE on some macros in const integer positions
6196 (e.g. `[u8; m!()]`)][36819]
6197 * [Improve error message and snippet for "did you mean `x`"][36798]
6198 * [Add a panic-strategy field to the target specification][36794]
6199 * [Include LLVM version in `--version --verbose`][37200]
6201 Compile-time Optimizations
6202 --------------------------
6204 * [Improve macro expansion performance][37569]
6205 * [Shrink `Expr_::ExprInlineAsm`][37445]
6206 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6207 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6208 * [Avoid more allocations when compiling html5ever][37373]
6209 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6210 * [Avoid some allocations in the macro parser][37318]
6211 * [Use a faster deflate setting][37298]
6212 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6213 during interning of slices][37270]
6214 * [Optimize `write_metadata`][37267]
6215 * [Don't process obligation forest cycles when stalled][37231]
6216 * [Avoid many `CrateConfig` clones][37161]
6217 * [Optimize `Substs::super_fold_with`][37108]
6218 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6219 * [Speed up `plug_leaks`][36917]
6224 * [`println!()`, with no arguments, prints newline][36825].
6225 Previously, an empty string was required to achieve the same.
6226 * [`Wrapping` impls standard binary and unary operators, as well as
6227 the `Sum` and `Product` iterators][37356]
6228 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6230 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6231 `VecDeque` iterators][37315]
6232 * [Improve `SipHasher` performance on small values][37312]
6233 * [Add Iterator trait TrustedLen to enable better FromIterator /
6235 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6236 * [`ReadDir` implements `Debug`][37221]
6237 * [Implement `RefUnwindSafe` for atomic types][37178]
6238 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6239 * [Avoid allocations in `Decoder::read_str`][37064]
6240 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6241 * [Impl `Debug` for raw pointers to unsized data][36880]
6242 * [Don't reuse `HashMap` random seeds][37470]
6243 * [The internal memory layout of `HashMap` is more cache-friendly, for
6244 significant improvements in some operations][36692]
6245 * [`HashMap` uses less memory on 32-bit architectures][36595]
6246 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6251 * [Expose rustc cfg values to build scripts][cargo/3243]
6252 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6253 * [Fix passing --features when testing multiple packages][cargo/3280]
6254 * [Use a single profile set per workspace][cargo/3249]
6255 * [Load `replace` sections from lock files][cargo/3220]
6256 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6261 * [rustup is the recommended Rust installation method][1.14rustup]
6262 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6263 S390x. These are [tier 2] platforms and may have major defects. Follow the
6264 instructions on the website to install, or add the targets to an existing
6265 installation with `rustup target add`. The new target triples are:
6266 - `mips-unknown-linux-gnu`
6267 - `mipsel-unknown-linux-gnu`
6268 - `mips64-unknown-linux-gnuabi64`
6269 - `mips64el-unknown-linux-gnuabi64 `
6270 - `powerpc-unknown-linux-gnu`
6271 - `powerpc64-unknown-linux-gnu`
6272 - `powerpc64le-unknown-linux-gnu`
6273 - `s390x-unknown-linux-gnu `
6274 * This release includes target (std) builds for ARM Linux running MUSL
6275 libc. These are [tier 2] platforms and may have major defects. Add the
6276 following triples to an existing rustup installation with `rustup target add`:
6277 - `arm-unknown-linux-musleabi`
6278 - `arm-unknown-linux-musleabihf`
6279 - `armv7-unknown-linux-musleabihf`
6280 * This release includes [experimental support for WebAssembly][1.14wasm], via
6281 the `wasm32-unknown-emscripten` target. This target is known to have major
6282 defects. Please test, report, and fix.
6283 * rustup no longer installs documentation by default. Run `rustup
6284 component add rust-docs` to install.
6285 * [Fix line stepping in debugger][37310]
6286 * [Enable line number debuginfo in releases][37280]
6291 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6292 * [Add support for Fuchsia OS][37313]
6293 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6298 * [A number of forward-compatibility lints used by the compiler
6299 to gradually introduce language changes have been converted
6300 to deny by default][36894]:
6301 - ["use of inaccessible extern crate erroneously allowed"][36886]
6302 - ["type parameter default erroneously allowed in invalid location"][36887]
6303 - ["detects super or self keywords at the beginning of global path"][36888]
6304 - ["two overlapping inherent impls define an item with the same name
6305 were erroneously allowed"][36889]
6306 - ["floating-point constants cannot be used in patterns"][36890]
6307 - ["constants of struct or enum type can only be used in a pattern if
6308 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6309 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6310 * [Prohibit patterns in trait methods without bodies][37378]
6311 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6312 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6313 * [The `$crate` macro variable is accepted in fewer locations][37213]
6314 * [Impls specifying extra region requirements beyond the trait
6315 they implement are rejected][37167]
6316 * [Enums may not be unsized][37111]. Unsized enums are intended to
6317 work but never have. For now they are forbidden.
6318 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6320 [tier 2]: https://forge.rust-lang.org/platform-support.html
6321 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6322 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6323 [36430]: https://github.com/rust-lang/rust/pull/36430
6324 [36595]: https://github.com/rust-lang/rust/pull/36595
6325 [36595]: https://github.com/rust-lang/rust/pull/36595
6326 [36692]: https://github.com/rust-lang/rust/pull/36692
6327 [36767]: https://github.com/rust-lang/rust/pull/36767
6328 [36794]: https://github.com/rust-lang/rust/pull/36794
6329 [36798]: https://github.com/rust-lang/rust/pull/36798
6330 [36819]: https://github.com/rust-lang/rust/pull/36819
6331 [36822]: https://github.com/rust-lang/rust/pull/36822
6332 [36825]: https://github.com/rust-lang/rust/pull/36825
6333 [36843]: https://github.com/rust-lang/rust/pull/36843
6334 [36880]: https://github.com/rust-lang/rust/pull/36880
6335 [36886]: https://github.com/rust-lang/rust/issues/36886
6336 [36887]: https://github.com/rust-lang/rust/issues/36887
6337 [36888]: https://github.com/rust-lang/rust/issues/36888
6338 [36889]: https://github.com/rust-lang/rust/issues/36889
6339 [36890]: https://github.com/rust-lang/rust/issues/36890
6340 [36891]: https://github.com/rust-lang/rust/issues/36891
6341 [36892]: https://github.com/rust-lang/rust/issues/36892
6342 [36894]: https://github.com/rust-lang/rust/pull/36894
6343 [36917]: https://github.com/rust-lang/rust/pull/36917
6344 [36993]: https://github.com/rust-lang/rust/pull/36993
6345 [37037]: https://github.com/rust-lang/rust/pull/37037
6346 [37064]: https://github.com/rust-lang/rust/pull/37064
6347 [37094]: https://github.com/rust-lang/rust/pull/37094
6348 [37108]: https://github.com/rust-lang/rust/pull/37108
6349 [37111]: https://github.com/rust-lang/rust/pull/37111
6350 [37161]: https://github.com/rust-lang/rust/pull/37161
6351 [37162]: https://github.com/rust-lang/rust/pull/37162
6352 [37167]: https://github.com/rust-lang/rust/pull/37167
6353 [37178]: https://github.com/rust-lang/rust/pull/37178
6354 [37200]: https://github.com/rust-lang/rust/pull/37200
6355 [37213]: https://github.com/rust-lang/rust/pull/37213
6356 [37221]: https://github.com/rust-lang/rust/pull/37221
6357 [37224]: https://github.com/rust-lang/rust/pull/37224
6358 [37230]: https://github.com/rust-lang/rust/pull/37230
6359 [37231]: https://github.com/rust-lang/rust/pull/37231
6360 [37247]: https://github.com/rust-lang/rust/pull/37247
6361 [37267]: https://github.com/rust-lang/rust/pull/37267
6362 [37270]: https://github.com/rust-lang/rust/pull/37270
6363 [37273]: https://github.com/rust-lang/rust/pull/37273
6364 [37280]: https://github.com/rust-lang/rust/pull/37280
6365 [37298]: https://github.com/rust-lang/rust/pull/37298
6366 [37306]: https://github.com/rust-lang/rust/pull/37306
6367 [37310]: https://github.com/rust-lang/rust/pull/37310
6368 [37312]: https://github.com/rust-lang/rust/pull/37312
6369 [37313]: https://github.com/rust-lang/rust/pull/37313
6370 [37315]: https://github.com/rust-lang/rust/pull/37315
6371 [37318]: https://github.com/rust-lang/rust/pull/37318
6372 [37322]: https://github.com/rust-lang/rust/pull/37322
6373 [37326]: https://github.com/rust-lang/rust/pull/37326
6374 [37351]: https://github.com/rust-lang/rust/pull/37351
6375 [37356]: https://github.com/rust-lang/rust/pull/37356
6376 [37367]: https://github.com/rust-lang/rust/pull/37367
6377 [37373]: https://github.com/rust-lang/rust/pull/37373
6378 [37378]: https://github.com/rust-lang/rust/pull/37378
6379 [37389]: https://github.com/rust-lang/rust/pull/37389
6380 [37392]: https://github.com/rust-lang/rust/pull/37392
6381 [37427]: https://github.com/rust-lang/rust/pull/37427
6382 [37439]: https://github.com/rust-lang/rust/pull/37439
6383 [37445]: https://github.com/rust-lang/rust/pull/37445
6384 [37470]: https://github.com/rust-lang/rust/pull/37470
6385 [37569]: https://github.com/rust-lang/rust/pull/37569
6386 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6387 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6388 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6389 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6390 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6391 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6392 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6395 Version 1.13.0 (2016-11-10)
6396 ===========================
6401 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6402 errors, like the `try!` macro, described in [RFC 0243].
6403 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6404 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6405 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6406 * [Fix lifetime rules for 'if' conditions][36029]
6407 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6412 * [Add the `-C link-arg` argument][36574]
6413 * [Remove the old AST-based backend from rustc_trans][35764]
6414 * [Don't enable NEON by default on armv7 Linux][35814]
6415 * [Fix debug line number info for macro expansions][35238]
6416 * [Do not emit "class method" debuginfo for types that are not
6417 DICompositeType][36008]
6418 * [Warn about multiple conflicting #[repr] hints][34623]
6419 * [When sizing DST, don't double-count nested struct prefixes][36351]
6420 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6421 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6422 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6423 * [Expand macros without recursing to avoid stack overflows][36214]
6428 * [Replace macro backtraces with labeled local uses][35702]
6429 * [Improve error message for misplaced doc comments][33922]
6430 * [Buffer unix and lock windows to prevent message interleaving][35975]
6431 * [Update lifetime errors to specifically note temporaries][36171]
6432 * [Special case a few colors for Windows][36178]
6433 * [Suggest `use self` when such an import resolves][36289]
6434 * [Be more specific when type parameter shadows primitive type][36338]
6435 * Many minor improvements
6437 Compile-time Optimizations
6438 --------------------------
6440 * [Compute and cache HIR hashes at beginning][35854]
6441 * [Don't hash types in loan paths][36004]
6442 * [Cache projections in trans][35761]
6443 * [Optimize the parser's last token handling][36527]
6444 * [Only instantiate #[inline] functions in codegen units referencing
6445 them][36524]. This leads to big improvements in cases where crates export
6446 define many inline functions without using them directly.
6447 * [Lazily allocate TypedArena's first chunk][36592]
6448 * [Don't allocate during default HashSet creation][36734]
6455 * [`overflowing_abs`]
6456 * [`RefCell::try_borrow`]
6457 * [`RefCell::try_borrow_mut`]
6462 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6463 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6465 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6466 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6467 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6468 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6469 * [Use arc4rand on FreeBSD][35884]
6470 * [memrchr: Correct aligned offset computation][35969]
6471 * [Improve Demangling of Rust Symbols][36059]
6472 * [Use monotonic time in condition variables][35048]
6473 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6474 * [Implement conversion traits for `char`][35755]
6475 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6476 * [Zero first byte of CString on drop][36264]
6477 * [Inherit overflow checks for sum and product][36372]
6478 * [Add missing Eq implementations][36423]
6479 * [Implement `Debug` for `DirEntry`][36631]
6480 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6482 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6483 * [Implement more traits for `std::io::ErrorKind`][35911]
6484 * [Optimize BinaryHeap bounds checking][36072]
6485 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6486 `extend_with_element`][36355]
6487 * [Fix overflow checking in unsigned pow()][34942]
6492 * This release includes security fixes to both curl and OpenSSL.
6493 * [Fix transitive doctests when panic=abort][cargo/3021]
6494 * [Add --all-features flag to cargo][cargo/3038]
6495 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6496 * [Don't parse the home directory more than once][cargo/3078]
6497 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6498 * [Update OpenSSL to 1.0.2j][cargo/3121]
6499 * [Add license and license_file to cargo metadata output][cargo/3110]
6500 * [Make crates-io registry URL optional in config; ignore all changes to
6501 source.crates-io][cargo/3089]
6502 * [Don't download dependencies from other platforms][cargo/3123]
6503 * [Build transitive dev-dependencies when needed][cargo/3125]
6504 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6505 * [Avoid updating registry when adding existing deps][cargo/3144]
6506 * [Warn about path overrides that won't work][cargo/3136]
6507 * [Use workspaces during `cargo install`][cargo/3146]
6508 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6509 * [Add --message-format flag][cargo/3000]
6510 * [Pass target environment for rustdoc][cargo/3205]
6511 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6512 * [Update curl and curl-sys][cargo/3241]
6513 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6518 * [rustdoc: Add the `--sysroot` argument][36586]
6519 * [rustdoc: Fix a couple of issues with the search results][35655]
6520 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6521 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6522 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6527 * [Remove unmaintained style guide][35124]
6528 * [Add s390x support][36369]
6529 * [Initial work at Haiku OS support][36727]
6530 * [Add mips-uclibc targets][35734]
6531 * [Crate-ify compiler-rt into compiler-builtins][35021]
6532 * [Add rustc version info (git hash + date) to dist tarball][36213]
6533 * Many documentation improvements
6538 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6539 * [Deny (by default) transmuting from fn item types to pointer-sized
6540 types][34923]. Continuing the long transition to zero-sized fn items,
6542 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6544 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6545 * [Fix lifetime rules for 'if' conditions][36029].
6546 * [Inherit overflow checks for sum and product][36372].
6547 * [Forbid user-defined macros named "macro_rules"][36730].
6549 [33922]: https://github.com/rust-lang/rust/pull/33922
6550 [34623]: https://github.com/rust-lang/rust/pull/34623
6551 [34923]: https://github.com/rust-lang/rust/pull/34923
6552 [34942]: https://github.com/rust-lang/rust/pull/34942
6553 [34982]: https://github.com/rust-lang/rust/pull/34982
6554 [35021]: https://github.com/rust-lang/rust/pull/35021
6555 [35048]: https://github.com/rust-lang/rust/pull/35048
6556 [35074]: https://github.com/rust-lang/rust/pull/35074
6557 [35124]: https://github.com/rust-lang/rust/pull/35124
6558 [35234]: https://github.com/rust-lang/rust/pull/35234
6559 [35238]: https://github.com/rust-lang/rust/pull/35238
6560 [35354]: https://github.com/rust-lang/rust/pull/35354
6561 [35559]: https://github.com/rust-lang/rust/pull/35559
6562 [35585]: https://github.com/rust-lang/rust/pull/35585
6563 [35627]: https://github.com/rust-lang/rust/pull/35627
6564 [35655]: https://github.com/rust-lang/rust/pull/35655
6565 [35702]: https://github.com/rust-lang/rust/pull/35702
6566 [35707]: https://github.com/rust-lang/rust/pull/35707
6567 [35728]: https://github.com/rust-lang/rust/pull/35728
6568 [35734]: https://github.com/rust-lang/rust/pull/35734
6569 [35755]: https://github.com/rust-lang/rust/pull/35755
6570 [35761]: https://github.com/rust-lang/rust/pull/35761
6571 [35764]: https://github.com/rust-lang/rust/pull/35764
6572 [35814]: https://github.com/rust-lang/rust/pull/35814
6573 [35854]: https://github.com/rust-lang/rust/pull/35854
6574 [35871]: https://github.com/rust-lang/rust/pull/35871
6575 [35884]: https://github.com/rust-lang/rust/pull/35884
6576 [35911]: https://github.com/rust-lang/rust/pull/35911
6577 [35969]: https://github.com/rust-lang/rust/pull/35969
6578 [35975]: https://github.com/rust-lang/rust/pull/35975
6579 [36004]: https://github.com/rust-lang/rust/pull/36004
6580 [36008]: https://github.com/rust-lang/rust/pull/36008
6581 [36014]: https://github.com/rust-lang/rust/pull/36014
6582 [36029]: https://github.com/rust-lang/rust/pull/36029
6583 [36059]: https://github.com/rust-lang/rust/pull/36059
6584 [36072]: https://github.com/rust-lang/rust/pull/36072
6585 [36101]: https://github.com/rust-lang/rust/pull/36101
6586 [36104]: https://github.com/rust-lang/rust/pull/36104
6587 [36171]: https://github.com/rust-lang/rust/pull/36171
6588 [36173]: https://github.com/rust-lang/rust/pull/36173
6589 [36178]: https://github.com/rust-lang/rust/pull/36178
6590 [36213]: https://github.com/rust-lang/rust/pull/36213
6591 [36214]: https://github.com/rust-lang/rust/pull/36214
6592 [36264]: https://github.com/rust-lang/rust/pull/36264
6593 [36266]: https://github.com/rust-lang/rust/pull/36266
6594 [36289]: https://github.com/rust-lang/rust/pull/36289
6595 [36338]: https://github.com/rust-lang/rust/pull/36338
6596 [36351]: https://github.com/rust-lang/rust/pull/36351
6597 [36355]: https://github.com/rust-lang/rust/pull/36355
6598 [36369]: https://github.com/rust-lang/rust/pull/36369
6599 [36372]: https://github.com/rust-lang/rust/pull/36372
6600 [36423]: https://github.com/rust-lang/rust/pull/36423
6601 [36482]: https://github.com/rust-lang/rust/pull/36482
6602 [36505]: https://github.com/rust-lang/rust/pull/36505
6603 [36524]: https://github.com/rust-lang/rust/pull/36524
6604 [36527]: https://github.com/rust-lang/rust/pull/36527
6605 [36551]: https://github.com/rust-lang/rust/pull/36551
6606 [36574]: https://github.com/rust-lang/rust/pull/36574
6607 [36586]: https://github.com/rust-lang/rust/pull/36586
6608 [36592]: https://github.com/rust-lang/rust/pull/36592
6609 [36631]: https://github.com/rust-lang/rust/pull/36631
6610 [36639]: https://github.com/rust-lang/rust/pull/36639
6611 [36721]: https://github.com/rust-lang/rust/pull/36721
6612 [36727]: https://github.com/rust-lang/rust/pull/36727
6613 [36730]: https://github.com/rust-lang/rust/pull/36730
6614 [36734]: https://github.com/rust-lang/rust/pull/36734
6615 [36754]: https://github.com/rust-lang/rust/pull/36754
6616 [36995]: https://github.com/rust-lang/rust/pull/36995
6617 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6618 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6619 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6620 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6621 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6622 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6623 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6624 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6625 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6626 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6627 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6628 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6629 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6630 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6631 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6632 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6633 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6634 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6635 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6636 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6637 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6638 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6639 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6640 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6641 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6642 [rustup]: https://www.rustup.rs
6643 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6644 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6645 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6646 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6647 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6648 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6649 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6652 Version 1.12.1 (2016-10-20)
6653 ===========================
6658 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6659 * [Confusion with double negation and booleans][36856]
6660 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6661 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6662 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6663 * [Corrupted memory after updated to 1.12][36936]
6664 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6665 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6666 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6668 [36381]: https://github.com/rust-lang/rust/issues/36381
6669 [36856]: https://github.com/rust-lang/rust/issues/36856
6670 [36875]: https://github.com/rust-lang/rust/issues/36875
6671 [36924]: https://github.com/rust-lang/rust/issues/36924
6672 [36926]: https://github.com/rust-lang/rust/issues/36926
6673 [36936]: https://github.com/rust-lang/rust/issues/36936
6674 [37026]: https://github.com/rust-lang/rust/issues/37026
6675 [37112]: https://github.com/rust-lang/rust/issues/37112
6676 [37153]: https://github.com/rust-lang/rust/issues/37153
6679 Version 1.12.0 (2016-09-29)
6680 ===========================
6685 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6686 This translation pass is far simpler than the previous AST->LLVM pass, and
6687 creates opportunities to perform new optimizations directly on the MIR. It
6688 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6689 * [`rustc` presents a new, more readable error format, along with
6690 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6691 Most common editors supporting Rust have been updated to work with it. It was
6692 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6697 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6698 This translation pass is far simpler than the previous AST->LLVM pass, and
6699 creates opportunities to perform new optimizations directly on the MIR. It
6700 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6701 * [Print the Rust target name, not the LLVM target name, with
6702 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6703 * [The computation of `TypeId` is correct in some cases where it was previously
6704 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6705 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6706 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6707 `--print relocation-models`, and `--print code-models` print the available
6708 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6709 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6710 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6711 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6712 These targets produce statically-linked binaries. There are no binary release
6718 * [`rustc` presents a new, more readable error format, along with
6719 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6720 Most common editors supporting Rust have been updated to work with it. It was
6721 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6722 * [In error descriptions, references are now described in plain English,
6723 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6724 * [In error type descriptions, unknown numeric types are named `{integer}` or
6725 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6726 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6731 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6732 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6733 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6734 useful](https://github.com/rust-lang/rust/pull/34908)
6735 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6736 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6737 * [Semicolons are properly required as statement delimiters inside
6738 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6739 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6744 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6745 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6746 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6747 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6748 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6749 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6750 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6751 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6752 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6753 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6754 Both on Unix and Windows.
6755 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6756 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6757 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6758 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6759 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6760 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6761 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6762 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6767 * [The `format!` macro and friends now allow a single argument to be formatted
6768 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6769 * [The lifetime bounds on `[T]::binary_search_by` and
6770 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6771 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6772 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6773 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6774 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6775 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6776 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6777 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6778 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6779 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6780 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6781 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6782 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6783 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6784 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6785 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6786 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6787 * [`mpsc::sync_channel` `Receiver`s return any available message before
6788 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6789 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6790 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6795 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6796 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6797 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6798 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6799 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6800 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6801 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6802 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6803 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6804 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6805 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6806 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6807 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6808 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6809 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6810 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6815 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6816 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6821 * [Test binaries now support a `--test-threads` argument to specify the number
6822 of threads used to run tests, and which acts the same as the
6823 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6824 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6825 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6826 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6827 * [Rust releases now come with source packages that can be installed by rustup
6828 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6829 The resulting source code can be used by tools and IDES, located in the
6830 sysroot under `lib/rustlib/src`.
6835 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6836 * Many minor improvements to the documentation.
6837 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6842 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6843 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6844 * [When formatting strings, if "precision" is specified, the "fill",
6845 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6846 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6849 Version 1.11.0 (2016-08-18)
6850 ===========================
6855 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6856 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6857 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6858 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6863 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6864 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6865 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6866 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6867 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6868 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6869 (in libcore - previously stabilized in libstd)
6870 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6871 (in libcore - previously stabilized in libstd)
6872 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6873 (in libcore - previously stabilized in libstd)
6874 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6875 (in libcore - previously stabilized in libstd)
6876 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6877 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6878 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6879 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6884 * [The `thread_local!` macro supports multiple definitions in a single
6885 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6886 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6887 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6888 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6889 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6890 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6891 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6892 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6897 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6898 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6899 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6900 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6901 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6902 and `-vv` prints warnings for all crates.
6903 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6904 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6905 This provides room for expansion by arbitrary tools.
6906 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6907 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6908 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6909 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6910 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6911 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6912 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6917 * [Caching projections speeds up type check dramatically for some
6918 workloads](https://github.com/rust-lang/rust/pull/33816)
6919 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6920 This hasher is faster, but is believed to provide sufficient
6921 protection from collision attacks.
6922 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6927 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6928 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6929 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6930 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6931 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6936 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6937 * [When emitting debug info, rustc emits frame pointers for closures,
6938 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6939 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6940 * Many more errors have been given error codes and extended
6942 * API documentation continues to be improved, with many new examples
6947 * [rustc no longer hangs when dependencies recursively re-export
6948 submodules](https://github.com/rust-lang/rust/pull/34542)
6949 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6950 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6951 rewritten](https://github.com/rust-lang/rust/pull/33895)
6952 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6953 No targets use this yet, but it works toward AVR support.
6958 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6959 * [The new follow-set rules that place restrictions on `macro_rules!`
6960 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6961 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6962 and has been a warning since 1.10.
6963 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6964 This causes breakage in some corner cases.
6967 Version 1.10.0 (2016-07-07)
6968 ===========================
6973 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6974 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6975 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6976 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6977 * [`panic!` can be converted to a runtime abort with the
6978 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6979 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6980 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6981 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6982 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6983 Note that Cargo does not yet directly support cdylibs.
6988 * `os::windows::fs::OpenOptionsExt::access_mode`
6989 * `os::windows::fs::OpenOptionsExt::share_mode`
6990 * `os::windows::fs::OpenOptionsExt::custom_flags`
6991 * `os::windows::fs::OpenOptionsExt::attributes`
6992 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6993 * `os::unix::fs::OpenOptionsExt::custom_flags`
6994 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6995 * `Default for sync::Weak`
6996 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6997 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6998 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6999 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7000 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7001 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7002 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7003 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7004 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7005 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7006 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7007 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7008 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7009 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7010 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7011 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7012 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7013 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7014 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7015 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7016 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7017 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7018 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7019 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7020 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7021 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7022 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7023 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7024 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7025 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7026 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7027 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7028 * Read/Write/RawFd impls for `UnixStream`
7029 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7030 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7031 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7032 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7033 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7034 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7035 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7036 * RawFd impls for `UnixListener`
7037 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7038 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7039 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7040 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7041 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7042 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7043 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7044 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7045 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7046 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7047 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7048 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7049 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7050 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7051 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7052 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7053 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7054 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7055 * RawFd impls for `UnixDatagram`
7056 * `{BTree,Hash}Map::values_mut`
7057 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7062 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7063 The semantics of this minor method are subtle and probably not what
7065 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7066 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7067 will fall back to `/dev/urandom` temporarily to avoid blocking
7068 during early boot](https://github.com/rust-lang/rust/pull/33086).
7069 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7070 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7071 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7072 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7073 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7074 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7075 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7079 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7080 This controls the runtime behavior of the `panic!` macro
7081 and can be either "unwind" (the default), or "abort".
7082 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7083 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7084 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7085 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7086 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7087 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7088 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7089 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7090 By default they are retried twice, which can be customized with the
7091 `net.retry` value in `.cargo/config`.
7092 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7093 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7094 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7095 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7096 Makes it possible to install multiple crates in parallel.
7097 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7098 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7099 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7100 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7101 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7102 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7107 * [rustc memory usage was reduced by refactoring the context used for
7108 type checking](https://github.com/rust-lang/rust/pull/33425).
7109 * [Speed up creation of `HashMap`s by caching the random keys used
7110 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7111 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7112 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7113 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7114 10x faster than the previous lookup tables.
7115 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7120 * Many incremental improvements to documentation and rustdoc.
7121 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7122 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7123 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7124 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7125 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7126 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7127 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7132 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7133 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7134 * [`std` no longer prints backtraces on platforms where the running
7135 module must be loaded with `env::current_exe`, which can't be relied
7136 on](https://github.com/rust-lang/rust/pull/33554).
7137 * This release includes std binaries for the i586-unknown-linux-gnu,
7138 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7139 i586 target is for old x86 hardware without SSE2, and the armv7
7140 target is for Android running on modern ARM architectures.
7141 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7142 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7143 * [On Unix the runtime aborts by calling `libc::abort` instead of
7144 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7145 * [Rust is now bootstrapped from the previous release of Rust,
7146 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7151 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7152 * [`target_env` for Linux ARM targets is just `gnu`, not
7153 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7154 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7155 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7156 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7157 Affects how macros are parsed.
7158 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7159 * [Feature-gated attributes on macro-generated macro invocations are
7160 now rejected](https://github.com/rust-lang/rust/pull/32791).
7161 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7162 This caused some minor changes to type inference.
7165 Version 1.9.0 (2016-05-26)
7166 ==========================
7171 * The `#[deprecated]` attribute when applied to an API will generate
7172 warnings when used. The warnings may be suppressed with
7173 `#[allow(deprecated)]`. [RFC 1270].
7174 * [`fn` item types are zero sized, and each `fn` names a unique
7175 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7176 `transmute` on a `fn` type will generate a warning for a few cycles,
7177 then will be converted to an error.
7178 * [Field and method resolution understand visibility, so private
7179 fields and methods cannot prevent the proper use of public fields
7180 and methods][1.9fv].
7181 * [The parser considers unicode codepoints in the
7182 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7188 * [`std::panic::catch_unwind`] (renamed from `recover`)
7189 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7190 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7191 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7192 * [`str::is_char_boundary`]
7193 * [`<*const T>::as_ref`]
7194 * [`<*mut T>::as_ref`]
7195 * [`<*mut T>::as_mut`]
7196 * [`AsciiExt::make_ascii_uppercase`]
7197 * [`AsciiExt::make_ascii_lowercase`]
7198 * [`char::decode_utf16`]
7199 * [`char::DecodeUtf16`]
7200 * [`char::DecodeUtf16Error`]
7201 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7202 * [`BTreeSet::take`]
7203 * [`BTreeSet::replace`]
7206 * [`HashSet::replace`]
7208 * [`OsString::with_capacity`]
7209 * [`OsString::clear`]
7210 * [`OsString::capacity`]
7211 * [`OsString::reserve`]
7212 * [`OsString::reserve_exact`]
7213 * [`OsStr::is_empty`]
7215 * [`std::os::unix::thread`]
7218 * [`JoinHandleExt::as_pthread_t`]
7219 * [`JoinHandleExt::into_pthread_t`]
7220 * [`HashSet::hasher`]
7221 * [`HashMap::hasher`]
7222 * [`CommandExt::exec`]
7223 * [`File::try_clone`]
7224 * [`SocketAddr::set_ip`]
7225 * [`SocketAddr::set_port`]
7226 * [`SocketAddrV4::set_ip`]
7227 * [`SocketAddrV4::set_port`]
7228 * [`SocketAddrV6::set_ip`]
7229 * [`SocketAddrV6::set_port`]
7230 * [`SocketAddrV6::set_flowinfo`]
7231 * [`SocketAddrV6::set_scope_id`]
7232 * [`slice::copy_from_slice`]
7233 * [`ptr::read_volatile`]
7234 * [`ptr::write_volatile`]
7235 * [`OpenOptions::create_new`]
7236 * [`TcpStream::set_nodelay`]
7237 * [`TcpStream::nodelay`]
7238 * [`TcpStream::set_ttl`]
7239 * [`TcpStream::ttl`]
7240 * [`TcpStream::set_only_v6`]
7241 * [`TcpStream::only_v6`]
7242 * [`TcpStream::take_error`]
7243 * [`TcpStream::set_nonblocking`]
7244 * [`TcpListener::set_ttl`]
7245 * [`TcpListener::ttl`]
7246 * [`TcpListener::set_only_v6`]
7247 * [`TcpListener::only_v6`]
7248 * [`TcpListener::take_error`]
7249 * [`TcpListener::set_nonblocking`]
7250 * [`UdpSocket::set_broadcast`]
7251 * [`UdpSocket::broadcast`]
7252 * [`UdpSocket::set_multicast_loop_v4`]
7253 * [`UdpSocket::multicast_loop_v4`]
7254 * [`UdpSocket::set_multicast_ttl_v4`]
7255 * [`UdpSocket::multicast_ttl_v4`]
7256 * [`UdpSocket::set_multicast_loop_v6`]
7257 * [`UdpSocket::multicast_loop_v6`]
7258 * [`UdpSocket::set_multicast_ttl_v6`]
7259 * [`UdpSocket::multicast_ttl_v6`]
7260 * [`UdpSocket::set_ttl`]
7261 * [`UdpSocket::ttl`]
7262 * [`UdpSocket::set_only_v6`]
7263 * [`UdpSocket::only_v6`]
7264 * [`UdpSocket::join_multicast_v4`]
7265 * [`UdpSocket::join_multicast_v6`]
7266 * [`UdpSocket::leave_multicast_v4`]
7267 * [`UdpSocket::leave_multicast_v6`]
7268 * [`UdpSocket::take_error`]
7269 * [`UdpSocket::connect`]
7270 * [`UdpSocket::send`]
7271 * [`UdpSocket::recv`]
7272 * [`UdpSocket::set_nonblocking`]
7277 * [`std::sync::Once` is poisoned if its initialization function
7279 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7280 * [Most types implement `fmt::Debug`][1.9db].
7281 * [The default buffer size used by `BufReader` and `BufWriter` was
7282 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7283 used by other languages.
7284 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7285 `Duration` additionally implements `*=` and `/=`][1.9ta].
7286 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7287 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7288 * [`Chain` implements `BufRead`][1.9ch].
7289 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7294 * [Cargo can now run concurrently][1.9cc].
7295 * [Top-level overrides allow specific revisions of crates to be
7296 overridden through the entire crate graph][1.9ct]. This is intended
7297 to make upgrades easier for large projects, by allowing crates to be
7298 forked temporarily until they've been upgraded and republished.
7299 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7300 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7301 on the commandline][1.9cf]. `rustc` arguments can also be specified
7302 in the `build.rustflags` configuration key.
7307 * [The time complexity of comparing variables for equivalence during type
7308 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7309 to major compilation time improvement in some scenarios.
7310 * [`ToString` is specialized for `str`, giving it the same performance
7311 as `to_owned`][1.9ts].
7312 * [Spawning processes with `Command::output` no longer creates extra
7314 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7315 for C-like enums][1.9cl].
7320 * [Passing the `--quiet` flag to a test runner will produce
7321 much-abbreviated output][1.9q].
7322 * The Rust Project now publishes std binaries for the
7323 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7324 `i586-pc-windows-msvc` targets.
7329 * [`std::sync::Once` is poisoned if its initialization function
7331 * [It is illegal to define methods with the same name in overlapping
7332 inherent `impl` blocks][1.9sn].
7333 * [`fn` item types are zero sized, and each `fn` names a unique
7334 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7335 `transmute` on a `fn` type will generate a warning for a few cycles,
7336 then will be converted to an error.
7337 * [Improvements to const evaluation may trigger new errors when integer
7338 literals are out of range][1.9ce].
7341 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7342 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7343 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7344 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7345 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7346 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7347 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7348 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7349 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7350 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7351 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7352 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7353 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7354 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7355 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7356 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7357 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7358 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7359 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7360 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7361 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7362 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7363 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7364 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7365 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7366 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7367 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7368 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7369 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7370 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7371 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7372 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7373 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7374 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7375 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7376 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7377 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7378 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7379 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7380 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7381 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7382 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7383 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7384 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7385 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7386 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7387 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7388 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7389 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7390 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7391 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7392 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7393 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7394 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7395 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7396 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7397 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7398 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7399 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7400 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7401 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7402 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7403 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7404 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7405 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7406 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7407 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7408 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7409 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7410 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7411 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7412 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7413 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7414 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7415 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7416 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7417 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7418 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7419 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7420 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7421 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7422 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7423 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7424 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7425 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7426 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7427 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7428 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7429 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7430 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7431 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7432 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7433 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7434 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7435 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7436 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7437 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7438 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7439 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7440 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7441 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7442 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7443 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7444 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7445 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7446 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7447 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7448 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7449 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7450 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7453 Version 1.8.0 (2016-04-14)
7454 ==========================
7459 * Rust supports overloading of compound assignment statements like
7460 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7461 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7462 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7464 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7465 addition to the non-braced form, `struct Foo;`. [RFC 218].
7471 * [`str::encode_utf16`] (renamed from `utf16_units`)
7472 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7475 * [`ptr::drop_in_place`]
7477 * [`time::SystemTime`]
7479 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7480 * [`Instant::elapsed`]
7481 * [`SystemTime::now`]
7482 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7483 * [`SystemTime::elapsed`]
7484 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7485 * [`SystemTimeError`]
7486 * [`SystemTimeError::duration`]
7487 * Various impls for `SystemTimeError`
7489 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7490 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7491 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7492 * [The `write!` and `writeln!` macros correctly emit errors if any of
7493 their arguments can't be formatted][1.8w].
7494 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7495 * [The Unix-specific `raw` modules, which contain a number of
7496 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7497 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7498 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7499 across platforms was making it difficult to implement `std`
7500 correctly. Those that need these definitions should use the `libc`
7502 * The Unix-specific `MetadataExt` traits, including
7503 `os::unix::fs::MetadataExt`, which expose values such as inode
7504 numbers [no longer return platform-specific types][1.8r], but
7505 instead return widened integers. [RFC 1415].
7506 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7507 * [Atomic loads and stores are not volatile][1.8a].
7508 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7513 * [Inlining hash functions lead to a 3% compile-time improvement in
7514 some workloads][1.8h].
7515 * When using jemalloc, its symbols are [unprefixed so that it
7516 overrides the libc malloc implementation][1.8h]. This means that for
7517 rustc, LLVM is now using jemalloc, which results in a 6%
7518 compile-time improvement on a specific workload.
7519 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7524 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7525 i686-pc-windows-msvc is now considered a tier-1 platform.
7526 * [The `--print targets` flag prints a list of supported targets][1.8t].
7527 * [The `--print cfg` flag prints the `cfg`s defined for the current
7529 * [`rustc` can be built with an new Cargo-based build system, written
7530 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7531 build system. To enable it configure with `configure --rustbuild`.
7532 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7533 variants while also indicating the total number of missing variants
7534 if more than 3][1.8m].
7535 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7536 * The Rust Project now publishes binary releases of the standard
7537 library for a number of tier-2 targets:
7538 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7539 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7540 `x86_64-rumprun-netbsd`. These can be installed with
7541 tools such as [multirust][1.8mr].
7546 * [`cargo init` creates a new Cargo project in the current
7547 directory][1.8ci]. It is otherwise like `cargo new`.
7548 * [Cargo has configuration keys for `-v` and
7549 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7550 `[term]` section of `.cargo/config`.
7551 * [Configuration keys that evaluate to strings or integers can be set
7552 via environment variables][1.8ce]. For example the `build.jobs` key
7553 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7554 precedence over config files.
7555 * [Target-specific dependencies support Rust `cfg` syntax for
7556 describing targets][1.8cfg] so that dependencies for multiple
7557 targets can be specified together. [RFC 1361].
7558 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7559 `RUSTDOC` take precedence over the `build.target-dir`,
7560 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7561 * [The child process tree is killed on Windows when Cargo is
7563 * [The `build.target` configuration value sets the target platform,
7564 like `--target`][1.8ct].
7569 * [Unstable compiler flags have been further restricted][1.8u]. Since
7570 1.0 `-Z` flags have been considered unstable, and other flags that
7571 were considered unstable additionally required passing `-Z
7572 unstable-options` to access. Unlike unstable language and library
7573 features though, these options have been accessible on the stable
7574 release channel. Going forward, *new unstable flags will not be
7575 available on the stable release channel*, and old unstable flags
7576 will warn about their usage. In the future, all unstable flags will
7577 be unavailable on the stable release channel.
7578 * [It is no longer possible to `match` on empty enum variants using
7579 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7580 * The Unix-specific `MetadataExt` traits, including
7581 `os::unix::fs::MetadataExt`, which expose values such as inode
7582 numbers [no longer return platform-specific types][1.8r], but
7583 instead return widened integers. [RFC 1415].
7584 * [Modules sourced from the filesystem cannot appear within arbitrary
7585 blocks, but only within other modules][1.8mf].
7586 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7587 * On Unix, [stack overflow triggers a runtime abort instead of a
7589 * [`Command::spawn` and its equivalents return an error if any of
7590 its command-line arguments contain interior `NUL`s][1.8n].
7591 * [Tuple and unit enum variants from other crates are in the type
7593 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7594 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7595 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7596 instead of `foo.lib`.
7599 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7600 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7601 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7602 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7603 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7604 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7605 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7606 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7607 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7608 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7609 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7610 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7611 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7612 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7613 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7614 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7615 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7616 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7617 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7618 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7619 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7620 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7621 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7622 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7623 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7624 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7625 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7626 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7627 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7628 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7629 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7630 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7631 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7632 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7633 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7634 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7635 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7636 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7637 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7638 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7639 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7640 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7641 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7642 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7643 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7644 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7645 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7646 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7647 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7648 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7649 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7650 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7651 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7652 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7653 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7654 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7655 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7656 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7657 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7658 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7661 Version 1.7.0 (2016-03-03)
7662 ==========================
7669 * [`Path::strip_prefix`] (renamed from relative_from)
7670 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7672 * [`Ipv4Addr::is_loopback`]
7673 * [`Ipv4Addr::is_private`]
7674 * [`Ipv4Addr::is_link_local`]
7675 * [`Ipv4Addr::is_multicast`]
7676 * [`Ipv4Addr::is_broadcast`]
7677 * [`Ipv4Addr::is_documentation`]
7679 * [`Ipv6Addr::is_unspecified`]
7680 * [`Ipv6Addr::is_loopback`]
7681 * [`Ipv6Addr::is_multicast`]
7684 * [`Vec::as_mut_slice`]
7686 * [`String::as_str`]
7687 * [`String::as_mut_str`]
7689 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7691 * `<[T]>::`[`sort_by_key`]
7692 * checked, saturated, and overflowing operations
7693 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7694 * [`i32::saturating_mul`]
7695 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7696 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7697 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7698 * [`u32::saturating_mul`]
7699 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7700 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7701 * and checked, saturated, and overflowing operations for other primitive types
7703 * [`ffi::IntoStringError`]
7704 * [`CString::into_string`]
7705 * [`CString::into_bytes`]
7706 * [`CString::into_bytes_with_nul`]
7707 * `From<CString> for Vec<u8>`
7709 * [`IntoStringError::into_cstring`]
7710 * [`IntoStringError::utf8_error`]
7711 * `Error for IntoStringError`
7713 * [`std::hash::BuildHasher`]
7714 * [`BuildHasher::Hasher`]
7715 * [`BuildHasher::build_hasher`]
7716 * [`std::hash::BuildHasherDefault`]
7717 * [`HashMap::with_hasher`]
7718 * [`HashMap::with_capacity_and_hasher`]
7719 * [`HashSet::with_hasher`]
7720 * [`HashSet::with_capacity_and_hasher`]
7721 * [`std::collections::hash_map::RandomState`]
7722 * [`RandomState::new`]
7723 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7724 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7725 from bytes is faster.
7726 * [The performance of `LineWriter` (and thus `io::stdout`) was
7727 improved by using `memchr` to search for newlines][1.7m].
7728 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7729 `f64` variants were stabilized previously.
7730 * [`BTreeMap` was rewritten to use less memory and improve the performance
7731 of insertion and iteration, the latter by as much as 5x][1.7bm].
7732 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7733 covariant over their contained type][1.7bt].
7734 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7735 over their contained type][1.7ll].
7736 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7738 * [`Any` is implemented for unsized types][1.7a].
7739 * [`Hash` is implemented for `Duration`][1.7h].
7744 * [When running tests with `--test`, rustdoc will pass `--cfg`
7745 arguments to the compiler][1.7dt].
7746 * [The compiler is built with RPATH information by default][1.7rpa].
7747 This means that it will be possible to run `rustc` when installed in
7748 unusual configurations without configuring the dynamic linker search
7750 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7751 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7752 over `LD_LIBRARY_PATH`.
7757 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7758 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7759 * [The `rerun-if-changed` build script directive no longer causes the
7760 build script to incorrectly run twice in certain scenarios][1.7rr].
7765 * Soundness fixes to the interactions between associated types and
7766 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7767 code that violates the new rules. This is a significant change that
7768 is known to break existing code, so it has emitted warnings for the
7769 new error cases since 1.4 to give crate authors time to adapt. The
7770 details of what is changing are subtle; read the RFC for more.
7771 * [Several bugs in the compiler's visibility calculations were
7772 fixed][1.7v]. Since this was found to break significant amounts of
7773 code, the new errors will be emitted as warnings for several release
7774 cycles, under the `private_in_public` lint.
7775 * Defaulted type parameters were accidentally accepted in positions
7776 that were not intended. In this release, [defaulted type parameters
7777 appearing outside of type definitions will generate a
7778 warning][1.7d], which will become an error in future releases.
7779 * [Parsing "." as a float results in an error instead of 0][1.7p].
7780 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7781 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7783 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7784 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7785 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7786 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7787 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7788 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7789 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7790 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7791 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7792 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7793 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7794 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7795 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7796 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7797 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7798 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7799 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7800 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7801 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7802 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7803 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7804 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7805 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7806 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7807 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7808 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7809 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7810 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7811 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7812 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7813 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7814 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7815 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7816 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7817 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7818 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7819 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7820 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7821 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7822 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7823 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7824 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7825 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7826 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7827 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7828 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7829 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7830 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7831 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7832 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7833 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7834 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7835 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7836 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7837 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7838 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7839 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7840 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7841 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7842 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7843 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7844 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7845 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7846 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7847 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7848 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7849 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7850 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7851 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7852 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7853 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7854 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7855 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7856 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7857 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7858 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7859 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7860 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7861 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7864 Version 1.6.0 (2016-01-21)
7865 ==========================
7870 * The `#![no_std]` attribute causes a crate to not be linked to the
7871 standard library, but only the [core library][1.6co], as described
7872 in [RFC 1184]. The core library defines common types and traits but
7873 has no platform dependencies whatsoever, and is the basis for Rust
7874 software in environments that cannot support a full port of the
7875 standard library, such as operating systems. Most of the core
7876 library is now stable.
7882 [`Read::read_exact`],
7883 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7884 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7885 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7886 [`os::unix::fs::DirBuilderExt`],
7887 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7888 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7889 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7890 [`collections::hash_map::Drain`],
7891 [`collections::hash_map::HashMap::drain`],
7892 [`collections::hash_set::Drain`],
7893 [`collections::hash_set::HashSet::drain`],
7894 [`collections::binary_heap::Drain`],
7895 [`collections::binary_heap::BinaryHeap::drain`],
7896 [`Vec::extend_from_slice`] (renamed from `push_all`),
7897 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7898 [`RwLock::into_inner`],
7899 [`Iterator::min_by_key`] (renamed from `min_by`),
7900 [`Iterator::max_by_key`] (renamed from `max_by`).
7901 * The [core library][1.6co] is stable, as are most of its APIs.
7902 * [The `assert_eq!` macro supports arguments that don't implement
7903 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7905 * Several timer functions that take duration in milliseconds [are
7906 deprecated in favor of those that take `Duration`][1.6ms]. These
7907 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7908 `thread::park_timeout_ms`.
7909 * The algorithm by which `Vec` reserves additional elements was
7910 [tweaked to not allocate excessive space][1.6a] while still growing
7912 * `From` conversions are [implemented from integers to floats][1.6f]
7913 in cases where the conversion is lossless. Thus they are not
7914 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7915 or `f64`. They are also not implemented for `isize` and `usize`
7916 because the implementations would be platform-specific. `From` is
7917 also implemented from `f32` to `f64`.
7918 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7919 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7920 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7921 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7923 * Sorting slices that are already sorted [is 50% faster in some
7929 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7930 * Cargo build scripts can specify their dependencies by emitting the
7931 [`rerun-if-changed`][1.6rr] key.
7932 * crates.io will reject publication of crates with dependencies that
7933 have a wildcard version constraint. Crates with wildcard
7934 dependencies were seen to cause a variety of problems, as described
7935 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7937 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7938 release folder. A variety of artifacts that Cargo failed to clean
7939 are now correctly deleted.
7944 * The `unreachable_code` lint [warns when a function call's argument
7946 * The parser indicates [failures that may be caused by
7947 confusingly-similar Unicode characters][1.6uc]
7948 * Certain macro errors [are reported at definition time][1.6m], not
7954 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7955 environment variable when locating crates. This was a pre-cargo
7956 feature for integrating with the package manager that was
7957 accidentally never removed.
7958 * [A number of bugs were fixed in the privacy checker][1.6p] that
7959 could cause previously-accepted code to break.
7960 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7961 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7962 struct pattern syntax (`Foo(..)`) can no longer be used to match
7963 unit structs. This is a warning now, but will become an error in
7964 future releases. Patterns that share the same name as a const are
7966 * A bug was fixed that causes [rustc not to apply default type
7967 parameters][1.6xc] when resolving certain method implementations of
7968 traits defined in other crates.
7970 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7971 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7972 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7973 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7974 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7975 [1.6co]: http://doc.rust-lang.org/core/index.html
7976 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7977 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7978 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7979 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7980 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7981 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7982 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7983 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7984 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7985 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7986 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7987 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7988 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7989 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7990 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7991 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7992 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7993 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7994 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7995 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7996 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7997 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7998 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7999 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8000 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8001 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8002 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8003 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8004 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8005 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8006 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8007 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8008 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8009 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8010 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8011 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8012 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8013 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8014 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8015 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8016 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8019 Version 1.5.0 (2015-12-10)
8020 ==========================
8022 * ~700 changes, numerous bugfixes
8028 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8029 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8030 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8031 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8032 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8033 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8034 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8035 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8036 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8037 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8038 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8039 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8040 [`Path::read_link`], [`Path::symlink_metadata`],
8041 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8042 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8043 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8044 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8045 [`slice::split_first_mut`], [`slice::split_first`],
8046 [`slice::split_last_mut`], [`slice::split_last`],
8047 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8048 [`str::MatchIndices`], [`str::RMatchIndices`],
8049 [`str::match_indices`], [`str::rmatch_indices`],
8050 [`str::slice_mut_unchecked`], [`string::ParseError`].
8051 * Rust applications hosted on crates.io can be installed locally to
8052 `~/.cargo/bin` with the [`cargo install`] command. Among other
8053 things this makes it easier to augment Cargo with new subcommands:
8054 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8055 invoked as `cargo foo`.
8056 * Crates with wildcard (`*`) dependencies will [emit warnings when
8057 published][1.5w]. In 1.6 it will no longer be possible to publish
8058 crates with wildcard dependencies.
8063 * The rules determining when a particular lifetime must outlive
8064 a particular value (known as '[dropck]') have been [modified
8065 to not rely on parametricity][1.5p].
8066 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8067 and `Arc`][1.5a]. Because these smart pointer types implement
8068 `Deref`, this causes breakage in cases where the interior type
8069 contains methods of the same name.
8070 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8071 that they could drop their content. Soundness fix.
8072 * All method invocations are [properly checked][1.5wf1] for
8073 [well-formedness][1.5wf2]. Soundness fix.
8074 * Traits whose supertraits contain `Self` are [not object
8075 safe][1.5o]. Soundness fix.
8076 * Target specifications support a [`no_default_libraries`][1.5nd]
8077 setting that controls whether `-nodefaultlibs` is passed to the
8078 linker, and in turn the `is_like_windows` setting no longer affects
8079 the `-nodefaultlibs` flag.
8080 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8081 * The `#[inline]` and `#[repr]` attributes [can only appear
8082 in valid locations][1.5at].
8083 * Native libraries linked from the local crate are [passed to
8084 the linker before native libraries from upstream crates][1.5nl].
8085 * Two rarely-used attributes, `#[no_debug]` and
8086 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8087 * Negation of unsigned integers, which has been a warning for
8088 several releases, [is now behind a feature gate and will
8089 generate errors][1.5nu].
8090 * The parser accidentally accepted visibility modifiers on
8091 enum variants, a bug [which has been fixed][1.5ev].
8092 * [A bug was fixed that allowed `use` statements to import unstable
8098 * When evaluating expressions at compile-time that are not
8099 compile-time constants (const-evaluating expressions in non-const
8100 contexts), incorrect code such as overlong bitshifts and arithmetic
8101 overflow will [generate a warning instead of an error][1.5ce],
8102 delaying the error until runtime. This will allow the
8103 const-evaluator to be expanded in the future backwards-compatibly.
8104 * The `improper_ctypes` lint [no longer warns about using `isize` and
8105 `usize` in FFI][1.5ict].
8110 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8112 * `Default` is [implemented for mutable slices][1.5d].
8113 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8114 * There are now `From` conversions [between floating point
8115 types][1.5f] where the conversions are lossless.
8116 * There are now `From` conversions [between integer types][1.5i] where
8117 the conversions are lossless.
8118 * [`fs::Metadata` implements `Clone`][1.5fs].
8119 * The `parse` method [accepts a leading "+" when parsing
8121 * [`AsMut` is implemented for `Vec`][1.5am].
8122 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8123 been optimized][1.5cf] and no longer rely on the default impl.
8124 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8125 `unsafe extern "C"` function types now [implement `Clone`,
8126 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8127 `fmt::Debug` for up to 12 arguments][1.5fp].
8128 * [Dropping `Vec`s is much faster in unoptimized builds when the
8129 element types don't implement `Drop`][1.5dv].
8130 * A bug that caused in incorrect behavior when [combining `VecDeque`
8131 with zero-sized types][1.5vdz] was resolved.
8132 * [`PartialOrd` for slices is faster][1.5po].
8137 * [Crate metadata size was reduced by 20%][1.5md].
8138 * [Improvements to code generation reduced the size of libcore by 3.3
8139 MB and rustc's memory usage by 18MB][1.5m].
8140 * [Improvements to deref translation increased performance in
8141 unoptimized builds][1.5dr].
8142 * Various errors in trait resolution [are deduplicated to only be
8143 reported once][1.5te].
8144 * Rust has preliminary [support for rumprun kernels][1.5rr].
8145 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8147 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8148 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8149 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8150 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8151 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8152 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8153 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8154 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8155 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8156 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8157 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8158 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8159 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8160 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8161 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8162 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8163 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8164 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8165 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8166 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8167 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8168 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8169 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8170 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8171 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8172 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8173 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8174 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8175 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8176 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8177 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8178 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8179 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8180 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8181 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8182 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8183 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8184 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8185 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8186 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8187 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8188 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8189 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8190 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8191 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8192 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8193 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8194 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8195 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8196 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8197 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8198 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8199 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8200 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8201 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8202 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8203 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8204 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8205 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8206 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8207 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8208 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8209 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8210 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8211 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8212 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8213 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8214 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8215 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8216 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8217 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8218 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8219 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8220 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8221 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8222 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8223 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8224 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8225 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8226 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8227 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8228 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8229 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8230 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8231 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8232 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8233 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8234 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8235 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8237 Version 1.4.0 (2015-10-29)
8238 ==========================
8240 * ~1200 changes, numerous bugfixes
8245 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8246 GNU) are now supported and recommended for use.
8251 * [Several changes have been made to fix type soundness and improve
8252 the behavior of associated types][sound]. See [RFC 1214]. Although
8253 we have mostly introduced these changes as warnings this release, to
8254 become errors next release, there are still some scenarios that will
8255 see immediate breakage.
8256 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8257 line breaks in addition to `\n`][crlf].
8258 * [Loans of `'static` lifetime extend to the end of a function][stat].
8259 * [`str::parse` no longer introduces avoidable rounding error when
8260 parsing floating point numbers. Together with earlier changes to
8261 float formatting/output, "round trips" like f.to_string().parse()
8262 now preserve the value of f exactly. Additionally, leading plus
8263 signs are now accepted][fp3].
8269 * `use` statements that import multiple items [can now rename
8270 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8271 * [Binops work correctly on fat pointers][binfat].
8272 * `pub extern crate`, which does not behave as expected, [issues a
8273 warning][pec] until a better solution is found.
8278 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8279 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8280 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8281 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8282 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8283 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8284 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8285 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8286 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8287 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8288 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8289 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8290 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8291 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8292 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8293 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8294 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8295 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8297 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8298 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8299 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8300 `f64::from_str_radix`.
8301 * [Reverse-searching strings is faster with the 'two-way'
8303 * [`std::io::copy` allows `?Sized` arguments][cc].
8304 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8305 [override `count`, `nth` and `last` with an O(1)
8306 implementation][it].
8307 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8308 * [`IntoRawFd` has been added to the Unix-specific prelude,
8309 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8311 * [`Extend<String>` and `FromIterator<String` are both implemented for
8313 * [`IntoIterator` is implemented for references to `Option` and
8315 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8316 Copy`][ext] as part of [RFC 839]. This will cause type inference
8317 breakage in rare situations.
8318 * [`BinaryHeap` implements `Debug`][bh2].
8319 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8321 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8322 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8323 * [String comparison is faster][faststr].
8324 * `&mut T` where `T: std::fmt::Write` [also implements
8325 `std::fmt::Write`][mutw].
8326 * [A stable regression in `VecDeque::push_back` and other
8327 capacity-altering methods that caused panics for zero-sized types
8329 * [Function pointers implement traits for up to 12 parameters][fp2].
8334 * The compiler [no longer uses the 'morestack' feature to prevent
8335 stack overflow][mm]. Instead it uses guard pages and stack
8336 probes (though stack probes are not yet implemented on any platform
8338 * [The compiler matches traits faster when projections are involved][p].
8339 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8341 * [Cargo now displays useful information about what its doing during
8342 `cargo update`][cu].
8344 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8345 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8346 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8347 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8348 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8349 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8350 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8351 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8352 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8353 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8354 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8355 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8356 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8357 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8358 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8359 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8360 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8361 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8362 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8363 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8364 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8365 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8366 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8367 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8368 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8369 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8370 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8371 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8372 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8373 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8374 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8375 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8376 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8377 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8378 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8379 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8380 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8381 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8382 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8383 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8384 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8385 [bh2]: https://github.com/rust-lang/rust/pull/28156
8386 [binfat]: https://github.com/rust-lang/rust/pull/28270
8387 [bm]: https://github.com/rust-lang/rust/pull/28197
8388 [cc]: https://github.com/rust-lang/rust/pull/27531
8389 [crlf]: https://github.com/rust-lang/rust/pull/28034
8390 [cu]: https://github.com/rust-lang/cargo/pull/1931
8391 [d]: https://github.com/rust-lang/rust/pull/27825
8392 [dep]: https://github.com/rust-lang/rust/pull/28339
8393 [es]: https://github.com/rust-lang/rust/pull/27956
8394 [ext]: https://github.com/rust-lang/rust/pull/28094
8395 [faststr]: https://github.com/rust-lang/rust/pull/28338
8396 [ffi]: https://github.com/rust-lang/rust/pull/28779
8397 [fp]: https://github.com/rust-lang/rust/pull/28268
8398 [fp2]: https://github.com/rust-lang/rust/pull/28560
8399 [fp3]: https://github.com/rust-lang/rust/pull/27307
8400 [i]: https://github.com/rust-lang/rust/pull/27451
8401 [into2]: https://github.com/rust-lang/rust/pull/28039
8402 [it]: https://github.com/rust-lang/rust/pull/27652
8403 [mm]: https://github.com/rust-lang/rust/pull/27338
8404 [mutw]: https://github.com/rust-lang/rust/pull/28368
8405 [sound]: https://github.com/rust-lang/rust/pull/27641
8406 [p]: https://github.com/rust-lang/rust/pull/27866
8407 [pec]: https://github.com/rust-lang/rust/pull/28486
8408 [pr]: https://github.com/rust-lang/rust/pull/27896
8409 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8410 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8411 [s]: https://github.com/rust-lang/rust/pull/27474
8412 [stab]: https://github.com/rust-lang/rust/pull/28339
8413 [stat]: https://github.com/rust-lang/rust/pull/28321
8414 [vd]: https://github.com/rust-lang/rust/pull/28494
8416 Version 1.3.0 (2015-09-17)
8417 ==============================
8419 * ~900 changes, numerous bugfixes
8424 * The [new object lifetime defaults][nold] have been [turned
8425 on][nold2] after a cycle of warnings about the change. Now types
8426 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8427 being interpreted as `&'a Box<Trait+'a>` to `&'a
8428 Box<Trait+'static>`.
8429 * [The Rustonomicon][nom] is a new book in the official documentation
8430 that dives into writing unsafe Rust.
8431 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8432 timekeeping is employed by other std APIs, as well as out-of-tree
8438 * The [new object lifetime defaults][nold] have been [turned
8439 on][nold2] after a cycle of warnings about the change.
8440 * There is a known [regression][lr] in how object lifetime elision is
8441 interpreted, the proper solution for which is undetermined.
8442 * The `#[prelude_import]` attribute, an internal implementation
8443 detail, was accidentally stabilized previously. [It has been put
8444 behind the `prelude_import` feature gate][pi]. This change is
8445 believed to break no existing code.
8446 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8447 [more sane for dynamically sized types][dst3]. Code that relied on
8448 the previous behavior is thought to be broken.
8449 * The `dropck` rules, which checks that destructors can't access
8450 destroyed values, [have been updated][dropck] to match the
8451 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8452 cause some previously-compiling code to no longer build.
8457 * The [new object lifetime defaults][nold] have been [turned
8458 on][nold2] after a cycle of warnings about the change.
8459 * Semicolons may [now follow types and paths in
8460 macros](https://github.com/rust-lang/rust/pull/27000).
8461 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8462 [more sane for dynamically sized types][dst3]. Code that relied on
8463 the previous behavior is not known to exist, and suspected to be
8465 * `'static` variables [may now be recursive][st].
8466 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8467 implementations correctly.
8468 * The `dropck` rules, which checks that destructors can't access
8469 destroyed values, [have been updated][dropck] to match the
8475 * The [`Duration`] API, [has been stabilized][ds], as well as the
8476 `std::time` module, which presently contains only `Duration`.
8477 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8478 * The owned C string, [`CString`], implements [`Borrow`] and the
8479 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8480 these allow C strings to be borrowed and cloned in generic code.
8481 * [`CStr`] implements [`Debug`].
8482 * [`AtomicPtr`] implements [`Debug`].
8483 * [`Error`] trait objects [can be downcast to their concrete types][e]
8484 in many common configurations, using the [`is`], [`downcast`],
8485 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8487 * Searching for substrings now [employs the two-way algorithm][search]
8488 instead of doing a naive search. This gives major speedups to a
8489 number of methods, including [`contains`][sc], [`find`][sf],
8490 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8491 [`ends_with`][sew] are also faster.
8492 * The performance of `PartialEq` for slices is [much faster][ps].
8493 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8494 is overridden and optimized by the implementations for scalars.
8495 * The [`Hasher`] trait now has a number of specialized `write_*`
8496 methods for primitive types, for efficiency.
8497 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8498 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8499 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8500 of [`std::error::Error::cause`][iec] also delegates to the inner
8502 * [`process::Child`][pc] gained the [`id`] method, which returns a
8503 `u32` representing the platform-specific process identifier.
8504 * The [`connect`] method on slices is deprecated, replaced by the new
8505 [`join`] method (note that both of these are on the *unstable*
8506 [`SliceConcatExt`] trait, but through the magic of the prelude are
8507 available to stable code anyway).
8508 * The [`Div`] operator is implemented for [`Wrapping`] types.
8509 * [`DerefMut` is implemented for `String`][dms].
8510 * Performance of SipHash (the default hasher for `HashMap`) is
8511 [better for long data][sh].
8512 * [`AtomicPtr`] implements [`Send`].
8513 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8514 are now [specialized to use uninitialized buffers for increased
8516 * Lifetime parameters of foreign functions [are now resolved
8522 * Rust can now, with some coercion, [produce programs that run on
8523 Windows XP][xp], though XP is not considered a supported platform.
8524 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8525 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8526 recommended for use in 1.3, though should be fully-functional
8527 in the [64-bit 1.4 beta][b14].
8528 * On Fedora-based systems installation will [properly configure the
8529 dynamic linker][fl].
8530 * The compiler gained many new extended error descriptions, which can
8531 be accessed with the `--explain` flag.
8532 * The `dropck` pass, which checks that destructors can't access
8533 destroyed values, [has been rewritten][dropck]. This fixes some
8534 soundness holes, and as such will cause some previously-compiling
8535 code to no longer build.
8536 * `rustc` now uses [LLVM to write archive files where possible][ar].
8537 Eventually this will eliminate the compiler's dependency on the ar
8539 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8540 supported FreeBSD on x86_64).
8541 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8542 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8544 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8545 will kill the process instead of leaking][nlp].
8547 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8548 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8549 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8550 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8551 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8552 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8553 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8554 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8555 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8556 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8557 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8558 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8559 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8560 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8561 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8562 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8563 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8564 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8565 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8566 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8567 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8568 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8569 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8570 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8571 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8572 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8573 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8574 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8575 [ar]: https://github.com/rust-lang/rust/pull/26926
8576 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8577 [dms]: https://github.com/rust-lang/rust/pull/26241
8578 [dropck]: https://github.com/rust-lang/rust/pull/27261
8579 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8580 [ds]: https://github.com/rust-lang/rust/pull/26818
8581 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8582 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8583 [dst3]: https://github.com/rust-lang/rust/pull/27351
8584 [e]: https://github.com/rust-lang/rust/pull/24793
8585 [f]: https://github.com/rust-lang/rust/pull/26588
8586 [fb]: https://github.com/rust-lang/rust/pull/26959
8587 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8588 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8589 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8590 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8591 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8592 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8593 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8594 [lic]: https://github.com/rust-lang/rust/pull/26583
8595 [lnu]: https://github.com/rust-lang/rust/pull/27026
8596 [lr]: https://github.com/rust-lang/rust/issues/27248
8597 [lum]: https://github.com/rust-lang/rust/pull/26378
8598 [lur]: https://github.com/rust-lang/rust/pull/26783
8599 [nlp]: https://github.com/rust-lang/rust/pull/27176
8600 [nold2]: https://github.com/rust-lang/rust/pull/27045
8601 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8602 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8603 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8604 [pi]: https://github.com/rust-lang/rust/pull/26699
8605 [ps]: https://github.com/rust-lang/rust/pull/26884
8606 [rte]: https://github.com/rust-lang/rust/pull/26950
8607 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8608 [search]: https://github.com/rust-lang/rust/pull/26327
8609 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8610 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8611 [sh]: https://github.com/rust-lang/rust/pull/27280
8612 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8613 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8614 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8615 [st]: https://github.com/rust-lang/rust/pull/26630
8616 [win1]: https://github.com/rust-lang/rust/pull/26569
8617 [win2]: https://github.com/rust-lang/rust/pull/26741
8618 [win3]: https://github.com/rust-lang/rust/pull/26741
8619 [win4]: https://github.com/rust-lang/rust/pull/27210
8620 [xp]: https://github.com/rust-lang/rust/pull/26569
8622 Version 1.2.0 (2015-08-07)
8623 ==========================
8625 * ~1200 changes, numerous bugfixes
8630 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8631 like `Rc` to contain types without a fixed size, arrays and trait
8632 objects, finally enabling use of `Rc<[T]>` and completing the
8633 implementation of DST.
8634 * [Parallel codegen][parcodegen] is now working again, which can
8635 substantially speed up large builds in debug mode; It also gets
8636 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8637 jobs). It's not enabled by default, but will be "in the near
8638 future". It can be activated with the `-C codegen-units=N` flag to
8640 * This is the first release with [experimental support for linking
8641 with the MSVC linker and lib C on Windows (instead of using the GNU
8642 variants via MinGW)][win]. It is yet recommended only for the most
8643 intrepid Rustaceans.
8644 * Benchmark compilations are showing a 30% improvement in
8645 bootstrapping over 1.1.
8650 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8651 unicode case mapping, which is a previously-planned change in
8652 behavior and considered a bugfix.
8653 * [`mem::align_of`] now specifies [the *minimum alignment* for
8654 T][align], which is usually the alignment programs are interested
8655 in, and the same value reported by clang's
8656 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8658 * [The `#[packed]` attribute is no longer silently accepted by the
8659 compiler][packed]. This attribute did nothing and code that
8660 mentioned it likely did not work as intended.
8661 * Associated type defaults are [now behind the
8662 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8663 defaults *did not work*, but could be mentioned syntactically. As
8664 such this breakage has minimal impact.
8669 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8670 matching against dereferenceable values.
8675 * The [`Extend`] trait, which grows a collection from an iterator, is
8676 implemented over iterators of references, for `String`, `Vec`,
8677 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8678 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8679 * The [`iter::once`] function returns an iterator that yields a single
8680 element, and [`iter::empty`] returns an iterator that yields no
8682 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8683 over substring matches.
8684 * [`Cell`] and [`RefCell`] both implement `Eq`.
8685 * A number of methods for wrapping arithmetic are added to the
8686 integral types, [`wrapping_div`], [`wrapping_rem`],
8687 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8688 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8689 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8690 type.. It is illegal for the default arithmetic operations in Rust
8691 to overflow; the desire to wrap must be explicit.
8692 * The `{:#?}` formatting specifier [displays the alternate,
8693 pretty-printed][debugfmt] form of the `Debug` formatter. This
8694 feature was actually introduced prior to 1.0 with little
8696 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8697 for writing data to formatted strings, similar to [`io::Write`].
8698 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8699 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8700 are used by code generators to emit implementations of [`Debug`].
8701 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8702 methods that convert case, following Unicode case mapping.
8703 * It is now easier to handle poisoned locks. The [`PoisonError`]
8704 type, returned by failing lock operations, exposes `into_inner`,
8705 `get_ref`, and `get_mut`, which all give access to the inner lock
8706 guard, and allow the poisoned lock to continue to operate. The
8707 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8708 poisoned lock without attempting to take the lock.
8709 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8710 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8711 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8712 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8714 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8720 * `rustc` employs smarter heuristics for guessing at [typos].
8721 * `rustc` emits more efficient code for [no-op conversions between
8722 unsafe pointers][nop].
8723 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8724 resulting in faster compile times and smaller code.
8726 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8727 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8728 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8729 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8730 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8731 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8732 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8733 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8734 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8735 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8736 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8737 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8738 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8739 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8740 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8741 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8742 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8743 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8744 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8745 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8746 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8747 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8748 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8749 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8750 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8751 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8752 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8753 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8754 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8755 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8756 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8757 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8758 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8759 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8760 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8761 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8762 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8763 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8764 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8765 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8766 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8767 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8768 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8769 [align]: https://github.com/rust-lang/rust/pull/25646
8770 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8771 [typos]: https://github.com/rust-lang/rust/pull/26087
8772 [nop]: https://github.com/rust-lang/rust/pull/26336
8773 [fat]: https://github.com/rust-lang/rust/pull/26411
8774 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8775 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8776 [packed]: https://github.com/rust-lang/rust/pull/25541
8777 [ad]: https://github.com/rust-lang/rust/pull/27382
8778 [win]: https://github.com/rust-lang/rust/pull/25350
8780 Version 1.1.0 (2015-06-25)
8781 =========================
8783 * ~850 changes, numerous bugfixes
8788 * The [`std::fs` module has been expanded][fs] to expand the set of
8789 functionality exposed:
8790 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8791 don't incur a syscall on some platforms.
8792 * A `symlink_metadata` function has been added.
8793 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8794 access to all underlying information.
8795 * The compiler now contains extended explanations of many errors. When an error
8796 with an explanation occurs the compiler suggests using the `--explain` flag
8797 to read the explanation. Error explanations are also [available online][err-index].
8798 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8799 well as other work, the time to bootstrap the compiler decreased by
8805 * The [`str::split_whitespace`] method splits a string on unicode
8806 whitespace boundaries.
8807 * On both Windows and Unix, new extension traits provide conversion of
8808 I/O types to and from the underlying system handles. On Unix, these
8809 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8810 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8811 `TcpListener`, and `UpdSocket`. Further implementations for
8812 `std::process` will be stabilized later.
8813 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8814 Windows, symlinks can be created with
8815 `std::os::windows::symlink_dir` and
8816 `std::os::windows::symlink_file`.
8817 * The `mpsc::Receiver` type can now be converted into an iterator with
8818 `into_iter` on the [`IntoIterator`] trait.
8819 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8820 implementation of the [`From`] trait.
8821 * The `Debug` implementation for `RangeFull` [creates output that is
8822 more consistent with other implementations][rf].
8823 * [`Debug` is implemented for `File`][file].
8824 * The `Default` implementation for `Arc` [no longer requires `Sync +
8826 * [The `Iterator` methods `count`, `nth`, and `last` have been
8827 overridden for slices to have O(1) performance instead of O(n)][si].
8828 * Incorrect handling of paths on Windows has been improved in both the
8829 compiler and the standard library.
8830 * [`AtomicPtr` gained a `Default` implementation][ap].
8831 * In accordance with Rust's policy on arithmetic overflow `abs` now
8832 [panics on overflow when debug assertions are enabled][abs].
8833 * The [`Cloned`] iterator, which was accidentally left unstable for
8834 1.0 [has been stabilized][c].
8835 * The [`Incoming`] iterator, which iterates over incoming TCP
8836 connections, and which was accidentally unnamable in 1.0, [is now
8837 properly exported][inc].
8838 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8839 `sift_up` or `sift_down` panic][bh].
8840 * The [`split_off`] method of `LinkedList` [no longer corrupts
8841 the list in certain scenarios][ll].
8846 * Type checking performance [has improved notably][sk] with
8847 [multiple improvements][pre].
8848 * The compiler [suggests code changes][ch] for more errors.
8849 * rustc and it's build system have experimental support for [building
8850 toolchains against MUSL][m] instead of glibc on Linux.
8851 * The compiler defines the `target_env` cfg value, which is used for
8852 distinguishing toolchains that are otherwise for the same
8853 platform. Presently this is set to `gnu` for common GNU Linux
8854 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8855 * The [`cargo rustc`][crc] command invokes a build with custom flags
8857 * [Android executables are always position independent][pie].
8858 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8861 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8862 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8863 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8864 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8865 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8866 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8867 [rf]: https://github.com/rust-lang/rust/pull/24491
8868 [err-index]: https://doc.rust-lang.org/error-index.html
8869 [sk]: https://github.com/rust-lang/rust/pull/24615
8870 [pre]: https://github.com/rust-lang/rust/pull/25323
8871 [file]: https://github.com/rust-lang/rust/pull/24598
8872 [ch]: https://github.com/rust-lang/rust/pull/24683
8873 [arc]: https://github.com/rust-lang/rust/pull/24695
8874 [si]: https://github.com/rust-lang/rust/pull/24701
8875 [ap]: https://github.com/rust-lang/rust/pull/24834
8876 [m]: https://github.com/rust-lang/rust/pull/24777
8877 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8878 [crc]: https://github.com/rust-lang/cargo/pull/1568
8879 [pie]: https://github.com/rust-lang/rust/pull/24953
8880 [abs]: https://github.com/rust-lang/rust/pull/25441
8881 [c]: https://github.com/rust-lang/rust/pull/25496
8882 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8883 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8884 [inc]: https://github.com/rust-lang/rust/pull/25522
8885 [bh]: https://github.com/rust-lang/rust/pull/25856
8886 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8887 [ll]: https://github.com/rust-lang/rust/pull/26022
8888 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8889 [drop]: https://github.com/rust-lang/rust/pull/24935
8891 Version 1.0.0 (2015-05-15)
8892 ========================
8894 * ~1500 changes, numerous bugfixes
8899 * The vast majority of the standard library is now `#[stable]`. It is
8900 no longer possible to use unstable features with a stable build of
8902 * Many popular crates on [crates.io] now work on the stable release
8904 * Arithmetic on basic integer types now [checks for overflow in debug
8910 * Several [restrictions have been added to trait coherence][coh] in
8911 order to make it easier for upstream authors to change traits
8912 without breaking downstream code.
8913 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8914 improve error messages and macro behavior. For example, `0b1234` is
8915 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8916 * Trait bounds [are always invariant][inv], eliminating the need for
8917 the `PhantomFn` and `MarkerTrait` lang items, which have been
8919 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8920 "foo" as bar` syntax has been replaced with `extern crate foo as
8921 bar`, and Cargo now automatically translates "-" in *package* names
8922 to underscore for the crate name.
8923 * [Lifetime shadowing is an error][lt].
8924 * [`Send` no longer implies `'static`][send-rfc].
8925 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8926 `MyType::default()`.
8927 * Primitive types [now have inherent methods][prim-inherent],
8928 obviating the need for extension traits like `SliceExt`.
8929 * Methods with `Self: Sized` in their `where` clause are [considered
8930 object-safe][self-sized], allowing many extension traits like
8931 `IteratorExt` to be merged into the traits they extended.
8932 * You can now [refer to associated types][assoc-where] whose
8933 corresponding trait bounds appear only in a `where` clause.
8934 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8935 like `Send` and `Sync` are now library-defined.
8936 * A [Reflect trait][reflect] was introduced, which means that
8937 downcasting via the `Any` trait is effectively limited to concrete
8938 types. This helps retain the potentially-important "parametricity"
8939 property: generic code cannot behave differently for different type
8940 arguments except in minor ways.
8941 * The `unsafe_destructor` feature is now deprecated in favor of the
8942 [new `dropck`][dropck]. This change is a major reduction in unsafe
8948 * The `thread_local` module [has been renamed to `std::thread`][th].
8949 * The methods of `IteratorExt` [have been moved to the `Iterator`
8951 * Several traits that implement Rust's conventions for type
8952 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8953 [centralized in the `std::convert` module][con].
8954 * The `FromError` trait [was removed in favor of `From`][fe].
8955 * The basic sleep function [has moved to
8956 `std::thread::sleep_ms`][slp].
8957 * The `splitn` function now takes an `n` parameter that represents the
8958 number of items yielded by the returned iterator [instead of the
8959 number of 'splits'][spl].
8960 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8961 * [Derived implementations of `PartialOrd` now order enums according
8962 to their explicitly-assigned discriminants][po].
8963 * [Methods for searching strings are generic over `Pattern`s][pat],
8964 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8966 * [In method resolution, object methods are resolved before inherent
8968 * [`String::from_str` has been deprecated in favor of the `From` impl,
8969 `String::from`][sf].
8970 * [`io::Error` implements `Sync`][ios].
8971 * [The `words` method on `&str` has been replaced with
8972 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8974 * The new path and IO modules are complete and `#[stable]`. This
8975 was the major library focus for this cycle.
8976 * The path API was [revised][path-normalize] to normalize `.`,
8977 adjusting the tradeoffs in favor of the most common usage.
8978 * A large number of remaining APIs in `std` were also stabilized
8979 during this cycle; about 75% of the non-deprecated API surface
8981 * The new [string pattern API][string-pattern] landed, which makes
8982 the string slice API much more internally consistent and flexible.
8983 * A new set of [generic conversion traits][conversion] replaced
8984 many existing ad hoc traits.
8985 * Generic numeric traits were [completely removed][num-traits]. This
8986 was made possible thanks to inherent methods for primitive types,
8987 and the removal gives maximal flexibility for designing a numeric
8988 hierarchy in the future.
8989 * The `Fn` traits are now related via [inheritance][fn-inherit]
8990 and provide ergonomic [blanket implementations][fn-blanket].
8991 * The `Index` and `IndexMut` traits were changed to
8992 [take the index by value][index-value], enabling code like
8993 `hash_map["string"]` to work.
8994 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8995 `Copy` data is known to be `Clone` as well.
9000 * Many errors now have extended explanations that can be accessed with
9001 the `--explain` flag to `rustc`.
9002 * Many new examples have been added to the standard library
9004 * rustdoc has received a number of improvements focused on completion
9006 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9007 * Much headway was made on ecosystem-wide CI, making it possible
9008 to [compare builds for breakage][ci-compare].
9011 [crates.io]: http://crates.io
9012 [clo]: https://github.com/rust-lang/rust/pull/24034
9013 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9014 [con]: https://github.com/rust-lang/rust/pull/23875
9015 [cr]: https://github.com/rust-lang/rust/pull/23419
9016 [fe]: https://github.com/rust-lang/rust/pull/23879
9017 [ie]: https://github.com/rust-lang/rust/pull/23300
9018 [inv]: https://github.com/rust-lang/rust/pull/23938
9019 [ios]: https://github.com/rust-lang/rust/pull/24133
9020 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9021 [lt]: https://github.com/rust-lang/rust/pull/24057
9022 [meth]: https://github.com/rust-lang/rust/pull/24056
9023 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9024 [po]: https://github.com/rust-lang/rust/pull/24270
9025 [sf]: https://github.com/rust-lang/rust/pull/24517
9026 [slp]: https://github.com/rust-lang/rust/pull/23949
9027 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9028 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9029 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9030 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9031 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9032 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9033 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9034 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9035 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9036 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9037 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9038 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9039 [reflect]: https://github.com/rust-lang/rust/pull/23712
9040 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9041 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9042 [index-value]: https://github.com/rust-lang/rust/pull/23601
9043 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9044 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9045 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9046 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9047 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9048 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9051 Version 1.0.0-alpha.2 (2015-02-20)
9052 =====================================
9054 * ~1300 changes, numerous bugfixes
9058 * The various I/O modules were [overhauled][io-rfc] to reduce
9059 unnecessary abstractions and provide better interoperation with
9060 the underlying platform. The old `io` module remains temporarily
9062 * The standard library now [participates in feature gating][feat],
9063 so use of unstable libraries now requires a `#![feature(...)]`
9064 attribute. The impact of this change is [described on the
9065 forum][feat-forum]. [RFC][feat-rfc].
9069 * `for` loops [now operate on the `IntoIterator` trait][into],
9070 which eliminates the need to call `.iter()`, etc. to iterate
9071 over collections. There are some new subtleties to remember
9072 though regarding what sort of iterators various types yield, in
9073 particular that `for foo in bar { }` yields values from a move
9074 iterator, destroying the original collection. [RFC][into-rfc].
9075 * Objects now have [default lifetime bounds][obj], so you don't
9076 have to write `Box<Trait+'static>` when you don't care about
9077 storing references. [RFC][obj-rfc].
9078 * In types that implement `Drop`, [lifetimes must outlive the
9079 value][drop]. This will soon make it possible to safely
9080 implement `Drop` for types where `#[unsafe_destructor]` is now
9081 required. Read the [gorgeous RFC][drop-rfc] for details.
9082 * The fully qualified <T as Trait>::X syntax lets you set the Self
9083 type for a trait method or associated type. [RFC][ufcs-rfc].
9084 * References to types that implement `Deref<U>` now [automatically
9085 coerce to references][deref] to the dereferenced type `U`,
9086 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9087 should eliminate many unsightly uses of `&*`, as when converting
9088 from references to vectors into references to
9089 slices. [RFC][deref-rfc].
9090 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9091 `|:|`) is obsolete and closure kind is inferred from context.
9092 * [`Self` is a keyword][Self].
9096 * The `Show` and `String` formatting traits [have been
9097 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9098 their related purposes. Automatically getting a string
9099 conversion to use with `format!("{:?}", something_to_debug)` is
9100 now written `#[derive(Debug)]`.
9101 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9102 OsStr}`, provide strings in platform-specific encodings for easier
9103 interop with system APIs. [RFC][osstr-rfc].
9104 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9105 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9106 creating raw pointers.
9110 * Certain long error messages of the form 'expected foo found bar'
9111 are now [split neatly across multiple
9112 lines][multiline]. Examples in the PR.
9113 * On Unix Rust can be [uninstalled][un] by running
9114 `/usr/local/lib/rustlib/uninstall.sh`.
9115 * The `#[rustc_on_unimplemented]` attribute, requiring the
9116 'on_unimplemented' feature, lets rustc [display custom error
9117 messages when a trait is expected to be implemented for a type
9122 * Rust is tested against a [LALR grammar][lalr], which parses
9123 almost all the Rust files that rustc does.
9125 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9126 [close]: https://github.com/rust-lang/rust/pull/21843
9127 [deref]: https://github.com/rust-lang/rust/pull/21351
9128 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9129 [drop]: https://github.com/rust-lang/rust/pull/21972
9130 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9131 [feat]: https://github.com/rust-lang/rust/pull/21248
9132 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9133 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9134 [fmt]: https://github.com/rust-lang/rust/pull/21457
9135 [into]: https://github.com/rust-lang/rust/pull/20790
9136 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9137 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9138 [lalr]: https://github.com/rust-lang/rust/pull/21452
9139 [multiline]: https://github.com/rust-lang/rust/pull/19870
9140 [obj]: https://github.com/rust-lang/rust/pull/22230
9141 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9142 [onun]: https://github.com/rust-lang/rust/pull/20889
9143 [osstr]: https://github.com/rust-lang/rust/pull/21488
9144 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9145 [Self]: https://github.com/rust-lang/rust/pull/22158
9146 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9147 [un]: https://github.com/rust-lang/rust/pull/22256
9150 Version 1.0.0-alpha (2015-01-09)
9151 ==================================
9153 * ~2400 changes, numerous bugfixes
9157 * The language itself is considered feature complete for 1.0,
9158 though there will be many usability improvements and bugfixes
9159 before the final release.
9160 * Nearly 50% of the public API surface of the standard library has
9161 been declared 'stable'. Those interfaces are unlikely to change
9163 * The long-running debate over integer types has been
9164 [settled][ints]: Rust will ship with types named `isize` and
9165 `usize`, rather than `int` and `uint`, for pointer-sized
9166 integers. Guidelines will be rolled out during the alpha cycle.
9167 * Most crates that are not `std` have been moved out of the Rust
9168 distribution into the Cargo ecosystem so they can evolve
9169 separately and don't need to be stabilized as quickly, including
9170 'time', 'getopts', 'num', 'regex', and 'term'.
9171 * Documentation continues to be expanded with more API coverage, more
9172 examples, and more in-depth explanations. The guides have been
9173 consolidated into [The Rust Programming Language][trpl].
9174 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9175 * All official Rust binary installers now come with [Cargo], the
9176 Rust package manager.
9180 * Closures have been [completely redesigned][unboxed] to be
9181 implemented in terms of traits, can now be used as generic type
9182 bounds and thus monomorphized and inlined, or via an opaque
9183 pointer (boxed) as in the old system. The new system is often
9184 referred to as 'unboxed' closures.
9185 * Traits now support [associated types][assoc], allowing families
9186 of related types to be defined together and used generically in
9188 * Enum variants are [namespaced by their type names][enum].
9189 * [`where` clauses][where] provide a more versatile and attractive
9190 syntax for specifying generic bounds, though the previous syntax
9192 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9194 * Rust [no longer has a runtime][rt] of any description, and only
9195 supports OS threads, not green threads.
9196 * At long last, Rust has been overhauled for 'dynamically-sized
9197 types' ([DST]), which integrates 'fat pointers' (object types,
9198 arrays, and `str`) more deeply into the type system, making it
9200 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9201 `..j` that produce range types and which, when combined with the
9202 `Index` operator and multidispatch, leads to a convenient slice
9204 * The new range syntax revealed an ambiguity in the fixed-length
9205 array syntax, so now fixed length arrays [are written `[T;
9207 * The `Copy` trait is no longer implemented automatically. Unsafe
9208 pointers no longer implement `Sync` and `Send` so types
9209 containing them don't automatically either. `Sync` and `Send`
9210 are now 'unsafe traits' so one can "forcibly" implement them via
9211 `unsafe impl` if a type confirms to the requirements for them
9212 even though the internals do not (e.g. structs containing unsafe
9213 pointers like `Arc`). These changes are intended to prevent some
9214 footguns and are collectively known as [opt-in built-in
9215 traits][oibit] (though `Sync` and `Send` will soon become pure
9216 library types unknown to the compiler).
9217 * Operator traits now take their operands [by value][ops], and
9218 comparison traits can use multidispatch to compare one type
9219 against multiple other types, allowing e.g. `String` to be
9220 compared with `&str`.
9221 * `if let` and `while let` are no longer feature-gated.
9222 * Rust has adopted a more [uniform syntax for escaping unicode
9223 characters][unicode].
9224 * `macro_rules!` [has been declared stable][mac]. Though it is a
9225 flawed system it is sufficiently popular that it must be usable
9226 for 1.0. Effort has gone into [future-proofing][mac-future] it
9227 in ways that will allow other macro systems to be developed in
9228 parallel, and won't otherwise impact the evolution of the
9230 * The prelude has been [pared back significantly][prelude] such
9231 that it is the minimum necessary to support the most pervasive
9232 code patterns, and through [generalized where clauses][where]
9233 many of the prelude extension traits have been consolidated.
9234 * Rust's rudimentary reflection [has been removed][refl], as it
9235 incurred too much code generation for little benefit.
9236 * [Struct variants][structvars] are no longer feature-gated.
9237 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9238 known as 'higher-ranked trait bounds', this crucially allows
9239 unboxed closures to work.
9240 * Macros invocations surrounded by parens or square brackets and
9241 not terminated by a semicolon are [parsed as
9242 expressions][macros], which makes expressions like `vec![1i32,
9243 2, 3].len()` work as expected.
9244 * Trait objects now implement their traits automatically, and
9245 traits that can be coerced to objects now must be [object
9247 * Automatically deriving traits is now done with `#[derive(...)]`
9248 not `#[deriving(...)]` for [consistency with other naming
9249 conventions][derive].
9250 * Importing the containing module or enum at the same time as
9251 items or variants they contain is [now done with `self` instead
9252 of `mod`][self], as in use `foo::{self, bar}`
9253 * Glob imports are no longer feature-gated.
9254 * The `box` operator and `box` patterns have been feature-gated
9255 pending a redesign. For now unique boxes should be allocated
9256 like other containers, with `Box::new`.
9260 * A [series][coll1] of [efforts][coll2] to establish
9261 [conventions][coll3] for collections types has resulted in API
9262 improvements throughout the standard library.
9263 * New [APIs for error handling][err] provide ergonomic interop
9264 between error types, and [new conventions][err-conv] describe
9265 more clearly the recommended error handling strategies in Rust.
9266 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9267 it is easier to discuss failure in the context of error handling
9268 without making clarifications as to whether you are referring to
9269 the 'fail' macro or failure more generally.
9270 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9271 syscall when available.
9272 * The 'serialize' crate has been renamed 'rustc-serialize' and
9273 moved out of the distribution to Cargo. Although it is widely
9274 used now, it is expected to be superseded in the near future.
9275 * The `Show` formatter, typically implemented with
9276 `#[derive(Show)]` is [now requested with the `{:?}`
9277 specifier][show] and is intended for use by all types, for uses
9278 such as `println!` debugging. The new `String` formatter must be
9279 implemented by hand, uses the `{}` specifier, and is intended
9280 for full-fidelity conversions of things that can logically be
9281 represented as strings.
9285 * [Flexible target specification][flex] allows rustc's code
9286 generation to be configured to support otherwise-unsupported
9288 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9289 respective debuggers with Rust-appropriate pretty-printing.
9290 * The Windows installation of Rust is distributed with the
9291 MinGW components currently required to link binaries on that
9296 * Nullable enum optimizations have been extended to more types so
9297 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9298 space than the inner types themselves.
9299 * Work has begun on supporting AArch64.
9301 [Cargo]: https://crates.io
9302 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9303 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9304 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9305 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9306 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9307 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9308 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9309 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9310 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9311 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9312 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9313 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9314 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9315 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9316 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9317 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9318 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9319 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9320 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9321 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9322 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9323 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9324 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9325 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9326 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9327 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9328 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9329 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9330 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9331 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9332 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9333 [trpl]: https://doc.rust-lang.org/book/index.html
9334 [rbe]: http://rustbyexample.com/
9337 Version 0.12.0 (2014-10-09)
9338 =============================
9340 * ~1900 changes, numerous bugfixes
9344 * The introductory documentation (now called The Rust Guide) has
9345 been completely rewritten, as have a number of supplementary
9347 * Rust's package manager, Cargo, continues to improve and is
9348 sometimes considered to be quite awesome.
9349 * Many API's in `std` have been reviewed and updated for
9350 consistency with the in-development Rust coding
9351 guidelines. The standard library documentation tracks
9352 stabilization progress.
9353 * Minor libraries have been moved out-of-tree to the rust-lang org
9354 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9355 be installed with Cargo.
9356 * Lifetime elision allows lifetime annotations to be left off of
9357 function declarations in many common scenarios.
9358 * Rust now works on 64-bit Windows.
9361 * Indexing can be overloaded with the `Index` and `IndexMut`
9363 * The `if let` construct takes a branch only if the `let` pattern
9364 matches, currently behind the 'if_let' feature gate.
9365 * 'where clauses', a more flexible syntax for specifying trait
9366 bounds that is more aesthetic, have been added for traits and
9367 free functions. Where clauses will in the future make it
9368 possible to constrain associated types, which would be
9369 impossible with the existing syntax.
9370 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9371 the 'slicing_syntax' feature gate, and can be overloaded with
9372 the `Slice` or `SliceMut` traits.
9373 * The syntax for matching of sub-slices has been changed to use a
9374 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9375 consistency with other uses of `..` and to future-proof
9376 potential additional uses of the syntax.
9377 * The syntax for matching inclusive ranges in patterns has changed
9378 from `0..3` to `0...4` to be consistent with the exclusive range
9380 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9381 c]`) has been put behind the 'advanced_slice_patterns' feature
9382 gate and may be removed in the future.
9383 * Components of tuples and tuple structs can be extracted using
9384 the `value.0` syntax, currently behind the `tuple_indexing`
9386 * The `#[crate_id]` attribute is no longer supported; versioning
9387 is handled by the package manager.
9388 * Renaming crate imports are now written `extern crate foo as bar`
9389 instead of `extern crate bar = foo`.
9390 * Renaming use statements are now written `use foo as bar` instead
9392 * `let` and `match` bindings and argument names in macros are now
9394 * The new, more efficient, closure types ('unboxed closures') have
9395 been added under a feature gate, 'unboxed_closures'. These will
9396 soon replace the existing closure types, once higher-ranked
9397 trait lifetimes are added to the language.
9398 * `move` has been added as a keyword, for indicating closures
9399 that capture by value.
9400 * Mutation and assignment is no longer allowed in pattern guards.
9401 * Generic structs and enums can now have trait bounds.
9402 * The `Share` trait is now called `Sync` to free up the term
9403 'shared' to refer to 'shared reference' (the default reference
9405 * Dynamically-sized types have been mostly implemented,
9406 unifying the behavior of fat-pointer types with the rest of the
9408 * As part of dynamically-sized types, the `Sized` trait has been
9409 introduced, which qualifying types implement by default, and
9410 which type parameters expect by default. To specify that a type
9411 parameter does not need to be sized, write `<Sized? T>`. Most
9412 types are `Sized`, notable exceptions being unsized arrays
9413 (`[T]`) and trait types.
9414 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9415 * Lifetime bounds can now be applied to type parameters and object
9417 * The old, reference counted GC type, `Gc<T>` which was once
9418 denoted by the `@` sigil, has finally been removed. GC will be
9419 revisited in the future.
9422 * Library documentation has been improved for a number of modules.
9423 * Bit-vectors, collections::bitv has been modernized.
9424 * The url crate is deprecated in favor of
9425 http://github.com/servo/rust-url, which can be installed with
9427 * Most I/O stream types can be cloned and subsequently closed from
9429 * A `std::time::Duration` type has been added for use in I/O
9430 methods that rely on timers, as well as in the 'time' crate's
9431 `Timespec` arithmetic.
9432 * The runtime I/O abstraction layer that enabled the green thread
9433 scheduler to do non-thread-blocking I/O has been removed, along
9434 with the libuv-based implementation employed by the green thread
9435 scheduler. This will greatly simplify the future I/O work.
9436 * `collections::btree` has been rewritten to have a more
9437 idiomatic and efficient design.
9440 * rustdoc output now indicates the stability levels of API's.
9441 * The `--crate-name` flag can specify the name of the crate
9442 being compiled, like `#[crate_name]`.
9443 * The `-C metadata` specifies additional metadata to hash into
9444 symbol names, and `-C extra-filename` specifies additional
9445 information to put into the output filename, for use by the
9446 package manager for versioning.
9447 * debug info generation has continued to improve and should be
9448 more reliable under both gdb and lldb.
9449 * rustc has experimental support for compiling in parallel
9450 using the `-C codegen-units` flag.
9451 * rustc no longer encodes rpath information into binaries by
9455 * Stack usage has been optimized with LLVM lifetime annotations.
9456 * Official Rust binaries on Linux are more compatible with older
9457 kernels and distributions, built on CentOS 5.10.
9460 Version 0.11.0 (2014-07-02)
9461 ==========================
9463 * ~1700 changes, numerous bugfixes
9466 * ~[T] has been removed from the language. This type is superseded by
9468 * ~str has been removed from the language. This type is superseded by
9470 * ~T has been removed from the language. This type is superseded by the
9472 * @T has been removed from the language. This type is superseded by the
9473 standard library's std::gc::Gc<T> type.
9474 * Struct fields are now all private by default.
9475 * Vector indices and shift amounts are both required to be a `uint`
9476 instead of any integral type.
9477 * Byte character, byte string, and raw byte string literals are now all
9478 supported by prefixing the normal literal with a `b`.
9479 * Multiple ABIs are no longer allowed in an ABI string
9480 * The syntax for lifetimes on closures/procedures has been tweaked
9481 slightly: `<'a>|A, B|: 'b + K -> T`
9482 * Floating point modulus has been removed from the language; however it
9483 is still provided by a library implementation.
9484 * Private enum variants are now disallowed.
9485 * The `priv` keyword has been removed from the language.
9486 * A closure can no longer be invoked through a &-pointer.
9487 * The `use foo, bar, baz;` syntax has been removed from the language.
9488 * The transmute intrinsic no longer works on type parameters.
9489 * Statics now allow blocks/items in their definition.
9490 * Trait bounds are separated from objects with + instead of : now.
9491 * Objects can no longer be read while they are mutably borrowed.
9492 * The address of a static is now marked as insignificant unless the
9493 #[inline(never)] attribute is placed it.
9494 * The #[unsafe_destructor] attribute is now behind a feature gate.
9495 * Struct literals are no longer allowed in ambiguous positions such as
9496 if, while, match, and for..in.
9497 * Declaration of lang items and intrinsics are now feature-gated by
9499 * Integral literals no longer default to `int`, and floating point
9500 literals no longer default to `f64`. Literals must be suffixed with an
9501 appropriate type if inference cannot determine the type of the
9503 * The Box<T> type is no longer implicitly borrowed to &mut T.
9504 * Procedures are now required to not capture borrowed references.
9507 * The standard library is now a "facade" over a number of underlying
9508 libraries. This means that development on the standard library should
9509 be speedier due to smaller crates, as well as a clearer line between
9511 * A new library, libcore, lives under the standard library's facade
9512 which is Rust's "0-assumption" library, suitable for embedded and
9513 kernel development for example.
9514 * A regex crate has been added to the standard distribution. This crate
9515 includes statically compiled regular expressions.
9516 * The unwrap/unwrap_err methods on Result require a Show bound for
9517 better error messages.
9518 * The return types of the std::comm primitives have been centralized
9519 around the Result type.
9520 * A number of I/O primitives have gained the ability to time out their
9522 * A number of I/O primitives have gained the ability to close their
9523 reading/writing halves to cancel pending operations.
9524 * Reverse iterator methods have been removed in favor of `rev()` on
9525 their forward-iteration counterparts.
9526 * A bitflags! macro has been added to enable easy interop with C and
9527 management of bit flags.
9528 * A debug_assert! macro is now provided which is disabled when
9529 `--cfg ndebug` is passed to the compiler.
9530 * A graphviz crate has been added for creating .dot files.
9531 * The std::cast module has been migrated into std::mem.
9532 * The std::local_data api has been migrated from freestanding functions
9533 to being based on methods.
9534 * The Pod trait has been renamed to Copy.
9535 * jemalloc has been added as the default allocator for types.
9536 * The API for allocating memory has been changed to use proper alignment
9537 and sized deallocation
9538 * Connecting a TcpStream or binding a TcpListener is now based on a
9539 string address and a u16 port. This allows connecting to a hostname as
9541 * The Reader trait now contains a core method, read_at_least(), which
9542 correctly handles many repeated 0-length reads.
9543 * The process-spawning API is now centered around a builder-style
9545 * The :? printing qualifier has been moved from the standard library to
9546 an external libdebug crate.
9547 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9548 have been renamed to Eq/Ord.
9549 * The select/plural methods have been removed from format!. The escapes
9550 for { and } have also changed from \{ and \} to {{ and }},
9552 * The TaskBuilder API has been re-worked to be a true builder, and
9553 extension traits for spawning native/green tasks have been added.
9556 * All breaking changes to the language or libraries now have their
9557 commit message annotated with `[breaking-change]` to allow for easy
9558 discovery of breaking changes.
9559 * The compiler will now try to suggest how to annotate lifetimes if a
9560 lifetime-related error occurs.
9561 * Debug info continues to be improved greatly with general bug fixes and
9562 better support for situations like link time optimization (LTO).
9563 * Usage of syntax extensions when cross-compiling has been fixed.
9564 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9565 -fdata-sections and --gc-sections has been enabled by default
9566 * The compiler is now stricter about where it will load module files
9567 from when a module is declared via `mod foo;`.
9568 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9569 Syntax extensions are now discovered via a "plugin registrar" type
9570 which will be extended in the future to other various plugins.
9571 * Lints have been restructured to allow for dynamically loadable lints.
9572 * A number of rustdoc improvements:
9573 * The HTML output has been visually redesigned.
9574 * Markdown is now powered by hoedown instead of sundown.
9575 * Searching heuristics have been greatly improved.
9576 * The search index has been reduced in size by a great amount.
9577 * Cross-crate documentation via `pub use` has been greatly improved.
9578 * Primitive types are now hyperlinked and documented.
9579 * Documentation has been moved from static.rust-lang.org/doc to
9581 * A new sandbox, play.rust-lang.org, is available for running and
9582 sharing rust code examples on-line.
9583 * Unused attributes are now more robustly warned about.
9584 * The dead_code lint now warns about unused struct fields.
9585 * Cross-compiling to iOS is now supported.
9586 * Cross-compiling to mipsel is now supported.
9587 * Stability attributes are now inherited by default and no longer apply
9588 to intra-crate usage, only inter-crate usage.
9589 * Error message related to non-exhaustive match expressions have been
9593 Version 0.10 (2014-04-03)
9594 =========================
9596 * ~1500 changes, numerous bugfixes
9599 * A new RFC process is now in place for modifying the language.
9600 * Patterns with `@`-pointers have been removed from the language.
9601 * Patterns with unique vectors (`~[T]`) have been removed from the
9603 * Patterns with unique strings (`~str`) have been removed from the
9605 * `@str` has been removed from the language.
9606 * `@[T]` has been removed from the language.
9607 * `@self` has been removed from the language.
9608 * `@Trait` has been removed from the language.
9609 * Headers on `~` allocations which contain `@` boxes inside the type for
9610 reference counting have been removed.
9611 * The semantics around the lifetimes of temporary expressions have changed,
9612 see #3511 and #11585 for more information.
9613 * Cross-crate syntax extensions are now possible, but feature gated. See
9614 #11151 for more information. This includes both `macro_rules!` macros as
9615 well as syntax extensions such as `format!`.
9616 * New lint modes have been added, and older ones have been turned on to be
9618 * Unnecessary parentheses
9621 * Uppercase variables
9622 * Publicly visible private types
9623 * `#[deriving]` with raw pointers
9624 * Unsafe functions can no longer be coerced to closures.
9625 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9626 * The `#[simd]` attribute is now behind a feature gate.
9627 * Visibility is no longer allowed on `extern crate` statements, and
9628 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9629 * Trailing commas are now allowed in argument lists and tuple patterns.
9630 * The `do` keyword has been removed, it is now a reserved keyword.
9631 * Default type parameters have been implemented, but are feature gated.
9632 * Borrowed variables through captures in closures are now considered soundly.
9633 * `extern mod` is now `extern crate`
9634 * The `Freeze` trait has been removed.
9635 * The `Share` trait has been added for types that can be shared among
9637 * Labels in macros are now hygienic.
9638 * Expression/statement macro invocations can be delimited with `{}` now.
9639 * Treatment of types allowed in `static mut` locations has been tweaked.
9640 * The `*` and `.` operators are now overloadable through the `Deref` and
9642 * `~Trait` and `proc` no longer have `Send` bounds by default.
9643 * Partial type hints are now supported with the `_` type marker.
9644 * An `Unsafe` type was introduced for interior mutability. It is now
9645 considered undefined to transmute from `&T` to `&mut T` without using the
9647 * The #[linkage] attribute was implemented for extern statics/functions.
9648 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9649 * `Pod` was renamed to `Copy`.
9652 * The `libextra` library has been removed. It has now been decomposed into
9653 component libraries with smaller and more focused nuggets of
9654 functionality. The full list of libraries can be found on the
9655 documentation index page.
9656 * std: `std::condition` has been removed. All I/O errors are now propagated
9657 through the `Result` type. In order to assist with error handling, a
9658 `try!` macro for unwrapping errors with an early return and a lint for
9659 unused results has been added. See #12039 for more information.
9660 * std: The `vec` module has been renamed to `slice`.
9661 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9662 This will become the only growable vector in the future.
9663 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9664 are now found at `std::io::BufferedReader` instead of
9665 `std::io::buffered::BufferedReader`.
9666 * std: `print` and `println` are no longer in the prelude, the `print!` and
9667 `println!` macros are intended to be used instead.
9668 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9669 attempts to statically prevent cycles.
9670 * std: The standard distribution is adopting the policy of pushing failure
9671 to the user rather than failing in libraries. Many functions (such as
9672 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9673 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9674 deriving mode: `#[deriving(Show)]`.
9675 * std: `ToStr` is now implemented for all types implementing `Show`.
9676 * std: The formatting trait methods now take `&self` instead of `&T`
9677 * std: The `invert()` method on iterators has been renamed to `rev()`
9678 * std: `std::num` has seen a reduction in the genericity of its traits,
9679 consolidating functionality into a few core traits.
9680 * std: Backtraces are now printed on task failure if the environment
9681 variable `RUST_BACKTRACE` is present.
9682 * std: Naming conventions for iterators have been standardized. More details
9683 can be found on the wiki's style guide.
9684 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9685 still implement the function.
9686 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9687 * std: `assert_approx_eq!` has been removed
9688 * std: The `e` and `E` formatting specifiers for floats have been added to
9689 print them in exponential notation.
9690 * std: The `Times` trait has been removed
9691 * std: Indications of variance and opting out of builtin bounds is done
9692 through marker types in `std::kinds::marker` now
9693 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9694 `#[deriving(Hash)]` is now possible.
9695 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9696 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9697 * std: `Chan::new` is now `channel()`.
9698 * std: A new synchronous channel type has been implemented.
9699 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9700 * std: `hashmap` and `trie` have been moved to `libcollections`
9701 * std: `run` has been rolled into `io::process`
9702 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9703 * std: The equality and comparison traits have seen some reorganization.
9704 * std: `rand` has moved to `librand`.
9705 * std: `to_{lower,upper}case` has been implemented for `char`.
9706 * std: Logging has been moved to `liblog`.
9707 * collections: `HashMap` has been rewritten for higher performance and less
9709 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9710 it can be booted manually. The runtime guide has more information and
9712 * native: All I/O functionality except signals has been implemented.
9713 * green: Task spawning with `libgreen` has been optimized with stack caching
9714 and various trimming of code.
9715 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9716 * sync: The `extra::sync` module has been updated to modern rust (and moved
9717 to the `sync` library), tweaking and improving various interfaces while
9718 dropping redundant functionality.
9719 * sync: A new `Barrier` type has been added to the `sync` library.
9720 * sync: An efficient mutex for native and green tasks has been implemented.
9721 * serialize: The `base64` module has seen some improvement. It treats
9722 newlines better, has non-string error values, and has seen general
9724 * fourcc: A `fourcc!` macro was introduced
9725 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9726 hexadecimal literal.
9729 * `rustpkg` has been deprecated and removed from the main repository. Its
9730 replacement, `cargo`, is under development.
9731 * Nightly builds of rust are now available
9732 * The memory usage of rustc has been improved many times throughout this
9734 * The build process supports disabling rpath support for the rustc binary
9736 * Code generation has improved in some cases, giving more information to the
9737 LLVM optimization passes to enable more extensive optimizations.
9738 * Debuginfo compatibility with lldb on OSX has been restored.
9739 * The master branch is now gated on an android bot, making building for
9740 android much more reliable.
9741 * Output flags have been centralized into one `--emit` flag.
9742 * Crate type flags have been centralized into one `--crate-type` flag.
9743 * Codegen flags have been consolidated behind a `-C` flag.
9744 * Linking against outdated crates now has improved error messages.
9745 * Error messages with lifetimes will often suggest how to annotate the
9746 function to fix the error.
9747 * Many more types are documented in the standard library, and new guides
9749 * Many `rustdoc` improvements:
9750 * code blocks are syntax highlighted.
9751 * render standalone markdown files.
9752 * the --test flag tests all code blocks by default.
9753 * exported macros are displayed.
9754 * re-exported types have their documentation inlined at the location of the
9756 * search works across crates that have been rendered to the same output
9760 Version 0.9 (2014-01-09)
9761 ==========================
9763 * ~1800 changes, numerous bugfixes
9766 * The `float` type has been removed. Use `f32` or `f64` instead.
9767 * A new facility for enabling experimental features (feature gating) has
9768 been added, using the crate-level `#[feature(foo)]` attribute.
9769 * Managed boxes (@) are now behind a feature gate
9770 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9771 standard library's `Gc` or `Rc` types instead.
9772 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9773 * Jumping back to the top of a loop is now done with `continue` instead of
9775 * Strings can no longer be mutated through index assignment.
9776 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9777 hash delimiters, as in `r###"foo"###`.
9778 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9780 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9781 * `@fn`s have been removed.
9782 * `do` only works with procs in order to make it obvious what the cost
9784 * Single-element tuple-like structs can no longer be dereferenced to
9785 obtain the inner value. A more comprehensive solution for overloading
9786 the dereference operator will be provided in the future.
9787 * The `#[link(...)]` attribute has been replaced with
9788 `#[crate_id = "name#vers"]`.
9789 * Empty `impl`s must be terminated with empty braces and may not be
9790 terminated with a semicolon.
9791 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9792 no longer has any special meaning.
9793 * The old `fmt!` string formatting macro has been removed.
9794 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9795 `print!` and `println!`.
9796 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9797 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9798 `extern mod foo = "bar"` instead.
9799 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9800 * Macros can have attributes.
9801 * Macros can expand to items with attributes.
9802 * Macros can expand to multiple items.
9803 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9804 * Comments may be nested.
9805 * Values automatically coerce to trait objects they implement, without
9807 * Enum discriminants are no longer an entire word but as small as needed to
9808 contain all the variants. The `repr` attribute can be used to override
9809 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9810 `#[repr(C)]` to match C enums.
9811 * Non-string literals are not allowed in attributes (they never worked).
9812 * The FFI now supports variadic functions.
9813 * Octal numeric literals, as in `0o7777`.
9814 * The `concat!` syntax extension performs compile-time string concatenation.
9815 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9816 removed as Rust no longer uses segmented stacks.
9817 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9818 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9819 not `*`; ignoring remaining fields of a struct is also done with `..`,
9820 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9821 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9822 * `rustc` supports the "system" calling convention, which defaults to the
9823 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9825 * The `type_overflow` lint (default: warn) checks literals for overflow.
9826 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9827 * The `attribute_usage` lint (default: warn) warns about unknown
9829 * The `unknown_features` lint (default: warn) warns about unknown
9831 * The `dead_code` lint (default: warn) checks for dead code.
9832 * Rust libraries can be linked statically to one another
9833 * `#[link_args]` is behind the `link_args` feature gate.
9834 * Native libraries are now linked with `#[link(name = "foo")]`
9835 * Native libraries can be statically linked to a rust crate
9836 (`#[link(name = "foo", kind = "static")]`).
9837 * Native OS X frameworks are now officially supported
9838 (`#[link(name = "foo", kind = "framework")]`).
9839 * The `#[thread_local]` attribute creates thread-local (not task-local)
9840 variables. Currently behind the `thread_local` feature gate.
9841 * The `return` keyword may be used in closures.
9842 * Types that can be copied via a memcpy implement the `Pod` kind.
9843 * The `cfg` attribute can now be used on struct fields and enum variants.
9846 * std: The `option` and `result` API's have been overhauled to make them
9847 simpler, more consistent, and more composable.
9848 * std: The entire `std::io` module has been replaced with one that is
9849 more comprehensive and that properly interfaces with the underlying
9850 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9852 * std: `io::util` contains a number of useful implementations of
9853 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9854 `ZeroReader`, `TeeReader`.
9855 * std: The reference counted pointer type `extra::rc` moved into std.
9856 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9857 just a wrapper around it).
9858 * std: The `Either` type has been removed.
9859 * std: `fmt::Default` can be implemented for any type to provide default
9860 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9861 * std: The `rand` API continues to be tweaked.
9862 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9863 on failure in gdb, is now named `rust_fail`.
9864 * std: The `each_key` and `each_value` methods on `HashMap` have been
9865 replaced by the `keys` and `values` iterators.
9866 * std: Functions dealing with type size and alignment have moved from the
9867 `sys` module to the `mem` module.
9868 * std: The `path` module was written and API changed.
9869 * std: `str::from_utf8` has been changed to cast instead of allocate.
9870 * std: `starts_with` and `ends_with` methods added to vectors via the
9871 `ImmutableEqVector` trait, which is in the prelude.
9872 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9873 if the index is out of bounds.
9874 * std: Task failure no longer propagates between tasks, as the model was
9875 complex, expensive, and incompatible with thread-based tasks.
9876 * std: The `Any` type can be used for dynamic typing.
9877 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9879 * std: Methods that produce iterators generally do not have an `_iter`
9881 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9882 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9883 * std: `util::ignore` renamed to `prelude::drop`.
9884 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9886 * std: `vec::raw` has seen a lot of cleanup and API changes.
9887 * std: The standard library no longer includes any C++ code, and very
9888 minimal C, eliminating the dependency on libstdc++.
9889 * std: Runtime scheduling and I/O functionality has been factored out into
9890 extensible interfaces and is now implemented by two different crates:
9891 libnative, for native threading and I/O; and libgreen, for green threading
9892 and I/O. This paves the way for using the standard library in more limited
9893 embedded environments.
9894 * std: The `comm` module has been rewritten to be much faster, have a
9895 simpler, more consistent API, and to work for both native and green
9897 * std: All libuv dependencies have been moved into the rustuv crate.
9898 * native: New implementations of runtime scheduling on top of OS threads.
9899 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9901 * green: The green thread scheduler and message passing types are almost
9903 * extra: The `flatpipes` module had bitrotted and was removed.
9904 * extra: All crypto functions have been removed and Rust now has a policy of
9905 not reimplementing crypto in the standard library. In the future crypto
9906 will be provided by external crates with bindings to established libraries.
9907 * extra: `c_vec` has been modernized.
9908 * extra: The `sort` module has been removed. Use the `sort` method on
9912 * The `rust` and `rusti` commands have been removed, due to lack of
9914 * `rustdoc` was completely rewritten.
9915 * `rustdoc` can test code examples in documentation.
9916 * `rustpkg` can test packages with the argument, 'test'.
9917 * `rustpkg` supports arbitrary dependencies, including C libraries.
9918 * `rustc`'s support for generating debug info is improved again.
9919 * `rustc` has better error reporting for unbalanced delimiters.
9920 * `rustc`'s JIT support was removed due to bitrot.
9921 * Executables and static libraries can be built with LTO (-Z lto)
9922 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9926 Version 0.8 (2013-09-26)
9927 ============================
9929 * ~2200 changes, numerous bugfixes
9932 * The `for` loop syntax has changed to work with the `Iterator` trait.
9933 * At long last, unwinding works on Windows.
9934 * Default methods are ready for use.
9935 * Many trait inheritance bugs fixed.
9936 * Owned and borrowed trait objects work more reliably.
9937 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9938 * rustc can omit emission of code for the `debug!` macro if it is passed
9940 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9941 for foo.rs, then foo/mod.rs, and will generate an error when both are
9943 * Strings no longer contain trailing nulls. The new `std::c_str` module
9944 provides new mechanisms for converting to C strings.
9945 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9946 * The FFI has been overhauled such that foreign functions are called directly,
9947 instead of through a stack-switching wrapper.
9948 * Calling a foreign function must be done through a Rust function with the
9949 `#[fixed_stack_segment]` attribute.
9950 * The `externfn!` macro can be used to declare both a foreign function and
9951 a `#[fixed_stack_segment]` wrapper at once.
9952 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9953 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9954 * `priv` is disallowed everywhere except for struct fields and enum variants.
9955 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9956 * `ref` bindings in irrefutable patterns work correctly now.
9957 * `char` is now prevented from containing invalid code points.
9958 * Casting to `bool` is no longer allowed.
9959 * `\0` is now accepted as an escape in chars and strings.
9960 * `yield` is a reserved keyword.
9961 * `typeof` is a reserved keyword.
9962 * Crates may be imported by URL with `extern mod foo = "url";`.
9963 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9964 * Static vectors can be initialized with repeating elements,
9965 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9966 * Static structs can be initialized with functional record update,
9967 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9968 * `cfg!` can be used to conditionally execute code based on the crate
9969 configuration, similarly to `#[cfg(...)]`.
9970 * The `unnecessary_qualification` lint detects unneeded module
9971 prefixes (default: allow).
9972 * Arithmetic operations have been implemented on the SIMD types in
9973 `std::unstable::simd`.
9974 * Exchange allocation headers were removed, reducing memory usage.
9975 * `format!` implements a completely new, extensible, and higher-performance
9976 string formatting system. It will replace `fmt!`.
9977 * `print!` and `println!` write formatted strings (using the `format!`
9978 extension) to stdout.
9979 * `write!` and `writeln!` write formatted strings (using the `format!`
9980 extension) to the new Writers in `std::rt::io`.
9981 * The library section in which a function or static is placed may
9982 be specified with `#[link_section = "..."]`.
9983 * The `proto!` syntax extension for defining bounded message protocols
9985 * `macro_rules!` is hygienic for `let` declarations.
9986 * The `#[export_name]` attribute specifies the name of a symbol.
9987 * `unreachable!` can be used to indicate unreachable code, and fails
9991 * std: Transitioned to the new runtime, written in Rust.
9992 * std: Added an experimental I/O library, `rt::io`, based on the new
9994 * std: A new generic `range` function was added to the prelude, replacing
9995 `uint::range` and friends.
9996 * std: `range_rev` no longer exists. Since range is an iterator it can be
9997 reversed with `range(lo, hi).invert()`.
9998 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9999 renamed to `unwrap_or`.
10000 * std: The `iterator` module was renamed to `iter`.
10001 * std: Integral types now support the `checked_add`, `checked_sub`, and
10002 `checked_mul` operations for detecting overflow.
10003 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10005 * std: Methods are standardizing on conventions for casting methods:
10006 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10008 * std: The `CString` type in `c_str` provides new ways to convert to and
10010 * std: `DoubleEndedIterator` can yield elements in two directions.
10011 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10013 * std: `str::from_bytes` renamed to `str::from_utf8`.
10014 * std: `pop_opt` and `shift_opt` methods added to vectors.
10015 * std: The task-local data interface no longer uses @, and keys are
10016 no longer function pointers.
10017 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10018 * std: Added `SharedPort` to `comm`.
10019 * std: `Eq` has a default method for `ne`; only `eq` is required
10020 in implementations.
10021 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10022 is required in implementations.
10023 * std: `is_utf8` performance is improved, impacting many string functions.
10024 * std: `os::MemoryMap` provides cross-platform mmap.
10025 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10026 are not 'in-bounds' are considered undefined.
10027 * std: Many freestanding functions in `vec` removed in favor of methods.
10028 * std: Many freestanding functions on scalar types removed in favor of
10030 * std: Many options to task builders were removed since they don't make
10031 sense in the new scheduler design.
10032 * std: More containers implement `FromIterator` so can be created by the
10034 * std: More complete atomic types in `unstable::atomics`.
10035 * std: `comm::PortSet` removed.
10036 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10037 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10038 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10039 default implementations.
10040 * std: Various `from_str` functions were removed in favor of a generic
10041 `from_str` which is available in the prelude.
10042 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10043 * extra: `dlist`, the doubly-linked list was modernized.
10044 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10045 * extra: Added `glob` module, replacing `std::os::glob`.
10046 * extra: `rope` was removed.
10047 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10048 * extra: `net`, and `timer` were removed. The experimental replacements
10049 are `std::rt::io::net` and `std::rt::io::timer`.
10050 * extra: Iterators implemented for `SmallIntMap`.
10051 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10052 * extra: `SmallIntSet` removed. Use `BitvSet`.
10053 * extra: Performance of JSON parsing greatly improved.
10054 * extra: `semver` updated to SemVer 2.0.0.
10055 * extra: `term` handles more terminals correctly.
10056 * extra: `dbg` module removed.
10057 * extra: `par` module removed.
10058 * extra: `future` was cleaned up, with some method renames.
10059 * extra: Most free functions in `getopts` were converted to methods.
10062 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10063 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10064 similarly to gcc's `--march` flag.
10065 * rustc's performance compiling small crates is much better.
10066 * rustpkg has received many improvements.
10067 * rustpkg supports git tags as package IDs.
10068 * rustpkg builds into target-specific directories so it can be used for
10070 * The number of concurrent test tasks is controlled by the environment
10071 variable RUST_TEST_TASKS.
10072 * The test harness can now report metrics for benchmarks.
10073 * All tools have man pages.
10074 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10075 * The runtime uses jemalloc for allocations.
10076 * Segmented stacks are temporarily disabled as part of the transition to
10077 the new runtime. Stack overflows are possible!
10078 * A new documentation backend, rustdoc_ng, is available for use. It is
10079 still invoked through the normal `rustdoc` command.
10082 Version 0.7 (2013-07-03)
10083 =======================
10085 * ~2000 changes, numerous bugfixes
10088 * `impl`s no longer accept a visibility qualifier. Put them on methods
10090 * The borrow checker has been rewritten with flow-sensitivity, fixing
10091 many bugs and inconveniences.
10092 * The `self` parameter no longer implicitly means `&'self self`,
10093 and can be explicitly marked with a lifetime.
10094 * Overloadable compound operators (`+=`, etc.) have been temporarily
10095 removed due to bugs.
10096 * The `for` loop protocol now requires `for`-iterators to return `bool`
10097 so they compose better.
10098 * The `Durable` trait is replaced with the `'static` bounds.
10099 * Trait default methods work more often.
10100 * Structs with the `#[packed]` attribute have byte alignment and
10101 no padding between fields.
10102 * Type parameters bound by `Copy` must now be copied explicitly with
10103 the `copy` keyword.
10104 * It is now illegal to move out of a dereferenced unsafe pointer.
10105 * `Option<~T>` is now represented as a nullable pointer.
10106 * `@mut` does dynamic borrow checks correctly.
10107 * The `main` function is only detected at the topmost level of the crate.
10108 The `#[main]` attribute is still valid anywhere.
10109 * Struct fields may no longer be mutable. Use inherited mutability.
10110 * The `#[no_send]` attribute makes a type that would otherwise be
10112 * The `#[no_freeze]` attribute makes a type that would otherwise be
10114 * Unbounded recursion will abort the process after reaching the limit
10115 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10116 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10117 are never implicitly copyable.
10118 * `#[static_assert]` makes compile-time assertions about static bools.
10119 * At long last, 'argument modes' no longer exist.
10120 * The rarely used `use mod` statement no longer exists.
10122 * Syntax extensions
10123 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10125 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10126 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10127 `#[deriving(...)]`.
10128 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10129 and unsuffixed integer literals.
10132 * The `core` crate was renamed to `std`.
10133 * The `std` crate was renamed to `extra`.
10134 * More and improved documentation.
10135 * std: `iterator` module for external iterator objects.
10136 * Many old-style (internal, higher-order function) iterators replaced by
10137 implementations of `Iterator`.
10138 * std: Many old internal vector and string iterators,
10139 incl. `any`, `all`. removed.
10140 * std: The `finalize` method of `Drop` renamed to `drop`.
10141 * std: The `drop` method now takes `&mut self` instead of `&self`.
10142 * std: The prelude no longer re-exports any modules, only types and traits.
10143 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10144 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10145 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10146 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10147 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10148 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10149 * std: Many types implement `Clone`.
10150 * std: `path` type renamed to `Path`.
10151 * std: `mut` module and `Mut` type removed.
10152 * std: Many standalone functions removed in favor of methods and iterators
10153 in `vec`, `str`. In the future methods will also work as functions.
10154 * std: `reinterpret_cast` removed. Use `transmute`.
10155 * std: ascii string handling in `std::ascii`.
10156 * std: `Rand` is implemented for ~/@.
10157 * std: `run` module for spawning processes overhauled.
10158 * std: Various atomic types added to `unstable::atomic`.
10159 * std: Various types implement `Zero`.
10160 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10161 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10162 * std: Added `os::mkdir_recursive`.
10163 * std: Added `os::glob` function performs filesystems globs.
10164 * std: `FuzzyEq` renamed to `ApproxEq`.
10165 * std: `Map` now defines `pop` and `swap` methods.
10166 * std: `Cell` constructors converted to static methods.
10167 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10168 * extra: `flate` module moved from `std` to `extra`.
10169 * extra: `fileinput` module for iterating over a series of files.
10170 * extra: `Complex` number type and `complex` module.
10171 * extra: `Rational` number type and `rational` module.
10172 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10173 * extra: `term` uses terminfo now, is more correct.
10174 * extra: `arc` functions converted to methods.
10175 * extra: Implementation of fixed output size variations of SHA-2.
10178 * `unused_variables` lint mode for unused variables (default: warn).
10179 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10181 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10183 * `dead_assignment` lint mode for unread variables (default: warn).
10184 * `unnecessary_allocation` lint mode detects some heap allocations that are
10185 immediately borrowed so could be written without allocating (default: warn).
10186 * `missing_doc` lint mode (default: allow).
10187 * `unreachable_code` lint mode (default: warn).
10188 * The `rusti` command has been rewritten and a number of bugs addressed.
10189 * rustc outputs in color on more terminals.
10190 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10191 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10192 * Compiling with `-g` will make the binary record information about
10193 dynamic borrowcheck failures for debugging.
10194 * rustdoc has a nicer stylesheet.
10195 * Various improvements to rustdoc.
10196 * Improvements to rustpkg (see the detailed release notes).
10199 Version 0.6 (2013-04-03)
10200 ========================
10202 * ~2100 changes, numerous bugfixes
10205 * The self type parameter in traits is now spelled `Self`
10206 * The `self` parameter in trait and impl methods must now be explicitly
10207 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10208 * Static methods no longer require the `static` keyword and instead
10209 are distinguished by the lack of a `self` parameter
10210 * Replaced the `Durable` trait with the `'static` lifetime
10211 * The old closure type syntax with the trailing sigil has been
10212 removed in favor of the more consistent leading sigil
10213 * `super` is a keyword, and may be prefixed to paths
10214 * Trait bounds are separated with `+` instead of whitespace
10215 * Traits are implemented with `impl Trait for Type`
10216 instead of `impl Type: Trait`
10217 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10218 * The `export` keyword has finally been removed
10219 * The `move` keyword has been removed (see "Semantic changes")
10220 * The interior mutability qualifier on vectors, `[mut T]`, has been
10221 removed. Use `&mut [T]`, etc.
10222 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10223 * `fail` is no longer a keyword. Use `fail!()`
10224 * `assert` is no longer a keyword. Use `assert!()`
10225 * `log` is no longer a keyword. use `debug!`, etc.
10226 * 1-tuples may be represented as `(T,)`
10227 * Struct fields may no longer be `mut`. Use inherited mutability,
10228 `@mut T`, `core::mut` or `core::cell`
10229 * `extern mod { ... }` is no longer valid syntax for foreign
10230 function modules. Use extern blocks: `extern { ... }`
10231 * Newtype enums removed. Use tuple-structs.
10232 * Trait implementations no longer support visibility modifiers
10233 * Pattern matching over vectors improved and expanded
10234 * `const` renamed to `static` to correspond to lifetime name,
10235 and make room for future `static mut` unsafe mutable globals.
10236 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10237 * `Clone` implementations can be automatically generated with
10238 `#[deriving(Clone)]`
10239 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10240 instead of `foo as Bar`.
10241 * Fixed length vector types are now written as `[int, .. 3]`
10242 instead of `[int * 3]`.
10243 * Fixed length vector types can express the length as a constant
10244 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10247 * Types with owned pointers or custom destructors move by default,
10248 eliminating the `move` keyword
10249 * All foreign functions are considered unsafe
10250 * &mut is now unaliasable
10251 * Writes to borrowed @mut pointers are prevented dynamically
10253 * The name of the main function can be customized using #[main]
10254 * The default type of an inferred closure is &fn instead of @fn
10255 * `use` statements may no longer be "chained" - they cannot import
10256 identifiers imported by previous `use` statements
10257 * `use` statements are crate relative, importing from the "top"
10258 of the crate by default. Paths may be prefixed with `super::`
10259 or `self::` to change the search behavior.
10260 * Method visibility is inherited from the implementation declaration
10261 * Structural records have been removed
10262 * Many more types can be used in static items, including enums
10263 'static-lifetime pointers and vectors
10264 * Pattern matching over vectors improved and expanded
10265 * Typechecking of closure types has been overhauled to
10266 improve inference and eliminate unsoundness
10267 * Macros leave scope at the end of modules, unless that module is
10268 tagged with #[macro_escape]
10271 * Added big integers to `std::bigint`
10272 * Removed `core::oldcomm` module
10273 * Added pipe-based `core::comm` module
10274 * Numeric traits have been reorganized under `core::num`
10275 * `vec::slice` finally returns a slice
10276 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10277 * Containers reorganized around traits in `core::container`
10278 * `core::dvec` removed, `~[T]` is a drop-in replacement
10279 * `core::send_map` renamed to `core::hashmap`
10280 * `std::map` removed; replaced with `core::hashmap`
10281 * `std::treemap` reimplemented as an owned balanced tree
10282 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10283 * `core::trie` added as a fast ordered map for integer keys
10284 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10285 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10286 overload the comparison operators, whereas `TotalOrd` is used
10287 by certain container types
10290 * Replaced the 'cargo' package manager with 'rustpkg'
10291 * Added all-purpose 'rust' tool
10292 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10293 * rustc now *attempts* to offer spelling suggestions
10294 * Improved support for ARM and Android
10295 * Preliminary MIPS backend
10296 * Improved foreign function ABI implementation for x86, x86_64
10297 * Various memory usage improvements
10298 * Rust code may be embedded in foreign code under limited circumstances
10299 * Inline assembler supported by new asm!() syntax extension.
10302 Version 0.5 (2012-12-21)
10303 ===========================
10305 * ~900 changes, numerous bugfixes
10308 * Removed `<-` move operator
10309 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10310 * Removed old fixed length vector syntax - `[T]/N`
10311 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10312 * Macros may now expand to items and statements
10313 * `a.b()` is always parsed as a method call, never as a field projection
10314 * `Eq` and `IterBytes` implementations can be automatically generated
10315 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10316 * Removed the special crate language for `.rc` files
10317 * Function arguments may consist of any irrefutable pattern
10320 * `&` and `~` pointers may point to objects
10321 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10322 * Enum variants may be structs
10323 * Destructors can be added to all nominal types with the Drop trait
10324 * Structs and nullary enum variants may be constants
10325 * Values that cannot be implicitly copied are now automatically moved
10326 without writing `move` explicitly
10327 * `&T` may now be coerced to `*T`
10328 * Coercions happen in `let` statements as well as function calls
10329 * `use` statements now take crate-relative paths
10330 * The module and type namespaces have been merged so that static
10331 method names can be resolved under the trait in which they are
10334 * Improved support for language features
10335 * Trait inheritance works in many scenarios
10336 * More support for explicit self arguments in methods - `self`, `&self`
10337 `@self`, and `~self` all generally work as expected
10338 * Static methods work in more situations
10339 * Experimental: Traits may declare default methods for the implementations
10343 * New condition handling system in `core::condition`
10344 * Timsort added to `std::sort`
10345 * New priority queue, `std::priority_queue`
10346 * Pipes for serializable types, `std::flatpipes'
10347 * Serialization overhauled to be trait-based
10348 * Expanded `getopts` definitions
10349 * Moved futures to `std`
10350 * More functions are pure now
10351 * `core::comm` renamed to `oldcomm`. Still deprecated
10352 * `rustdoc` and `cargo` are libraries now
10355 * Added a preliminary REPL, `rusti`
10356 * License changed from MIT to dual MIT/APL2
10359 Version 0.4 (2012-10-15)
10360 ==========================
10362 * ~2000 changes, numerous bugfixes
10365 * All keywords are now strict and may not be used as identifiers anywhere
10366 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10367 'of', 'with', 'to', 'class'.
10368 * Classes are replaced with simpler structs
10369 * Explicit method self types
10370 * `ret` became `return` and `alt` became `match`
10371 * `import` is now `use`; `use is now `extern mod`
10372 * `extern mod { ... }` is now `extern { ... }`
10373 * `use mod` is the recommended way to import modules
10374 * `pub` and `priv` replace deprecated export lists
10375 * The syntax of `match` pattern arms now uses fat arrow (=>)
10376 * `main` no longer accepts an args vector; use `os::args` instead
10379 * Trait implementations are now coherent, ala Haskell typeclasses
10380 * Trait methods may be static
10381 * Argument modes are deprecated
10382 * Borrowed pointers are much more mature and recommended for use
10383 * Strings and vectors in the static region are stored in constant memory
10384 * Typestate was removed
10385 * Resolution rewritten to be more reliable
10386 * Support for 'dual-mode' data structures (freezing and thawing)
10389 * Most binary operators can now be overloaded via the traits in
10391 * `std::net::url` for representing URLs
10392 * Sendable hash maps in `core::send_map`
10393 * `core::task' gained a (currently unsafe) task-local storage API
10396 * An efficient new intertask communication primitive called the pipe,
10397 along with a number of higher-level channel types, in `core::pipes`
10398 * `std::arc`, an atomically reference counted, immutable, shared memory
10400 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10401 * Futures are now based on pipes and sendable
10402 * More robust linked task failure
10403 * Improved task builder API
10406 * Improved error reporting
10407 * Preliminary JIT support
10408 * Preliminary work on precise GC
10409 * Extensive architectural improvements to rustc
10410 * Begun a transition away from buggy C++-based reflection (shape) code to
10411 Rust-based (visitor) code
10412 * All hash functions and tables converted to secure, randomized SipHash
10415 Version 0.3 (2012-07-12)
10416 ========================
10418 * ~1900 changes, numerous bugfixes
10420 * New coding conveniences
10421 * Integer-literal suffix inference
10422 * Per-item control over warnings, errors
10423 * #[cfg(windows)] and #[cfg(unix)] attributes
10424 * Documentation comments
10425 * More compact closure syntax
10426 * 'do' expressions for treating higher-order functions as
10428 * *-patterns (wildcard extended to all constructor fields)
10431 * Name resolution pass and exhaustiveness checker rewritten
10432 * Region pointers and borrow checking supersede alias
10434 * Init-ness checking is now provided by a region-based liveness
10435 pass instead of the typestate pass; same for last-use analysis
10436 * Extensive work on region pointers
10438 * Experimental new language features
10439 * Slices and fixed-size, interior-allocated vectors
10440 * #!-comments for lang versioning, shell execution
10441 * Destructors and iface implementation for classes;
10442 type-parameterized classes and class methods
10443 * 'const' type kind for types that can be used to implement
10444 shared-memory concurrency patterns
10448 * Removal of various obsolete features
10449 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10450 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10452 * Constructs: do-while loops ('do' repurposed), fn binding,
10453 resources (replaced by destructors)
10455 * Compiler reorganization
10456 * Syntax-layer of compiler split into separate crate
10457 * Clang (from LLVM project) integrated into build
10458 * Typechecker split into sub-modules
10461 * New time functions
10462 * Extension methods for many built-in types
10463 * Arc: atomic-refcount read-only / exclusive-use shared cells
10464 * Par: parallel map and search routines
10465 * Extensive work on libuv interface
10466 * Much vector code moved to libraries
10467 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10468 #include, #include_str, #include_bin
10470 * Tool improvements
10471 * Cargo automatically resolves dependencies
10474 Version 0.2 (2012-03-29)
10475 =========================
10477 * >1500 changes, numerous bugfixes
10479 * New docs and doc tooling
10481 * New port: FreeBSD x86_64
10483 * Compilation model enhancements
10484 * Generics now specialized, multiply instantiated
10485 * Functions now inlined across separate crates
10487 * Scheduling, stack and threading fixes
10488 * Noticeably improved message-passing performance
10489 * Explicit schedulers
10493 * Experimental new language features
10494 * Operator overloading
10498 * Various language extensions
10499 * C-callback function types: 'crust fn ...'
10500 * Infinite-loop construct: 'loop { ... }'
10501 * Shorten 'mutable' to 'mut'
10502 * Required mutable-local qualifier: 'let mut ...'
10503 * Basic glob-exporting: 'export foo::*;'
10504 * Alt now exhaustive, 'alt check' for runtime-checked
10505 * Block-function form of 'for' loop, with 'break' and 'ret'.
10508 * AST quasi-quote syntax extension
10509 * Revived libuv interface
10510 * New modules: core::{future, iter}, std::arena
10511 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10512 * Extensive cleanup, regularization in libstd, libcore
10515 Version 0.1 (2012-01-20)
10516 ===============================
10518 * Most language features work, including:
10519 * Unique pointers, unique closures, move semantics
10520 * Interface-constrained generics
10521 * Static interface dispatch
10523 * Multithread task scheduling
10524 * Typestate predicates
10525 * Failure unwinding, destructors
10526 * Pattern matching and destructuring assignment
10527 * Lightweight block-lambda syntax
10528 * Preliminary macro-by-example
10530 * Compiler works with the following configurations:
10531 * Linux: x86 and x86_64 hosts and targets
10532 * macOS: x86 and x86_64 hosts and targets
10533 * Windows: x86 hosts and targets
10535 * Cross compilation / multi-target configuration supported.
10537 * Preliminary API-documentation and package-management tools included.
10541 * Documentation is incomplete.
10543 * Performance is below intended target.
10545 * Standard library APIs are subject to extensive change, reorganization.
10547 * Language-level versioning is not yet operational - future code will
10548 break unexpectedly.