1 Version 1.54.0 (2021-07-29)
2 ============================
5 -----------------------
7 - [You can now use macros for values in key-value attributes.][83366]
8 While a seemingly minor addition on its own, this enables a lot of
9 powerful functionality when combined correctly. Most notably you can
10 now include external documentation in your crate by writing the following.
12 #![doc = include_str!("README.md")]
14 You can also use this to include auto-generated modules:
16 #[path = concat!(env!("OUT_DIR"), "/generated.rs")]
20 - [You can now cast between unsized slice types (and types which contain
21 unsized slices) in `const fn`.][85078]
22 - [TODO: stabilize member constraints][84701]
25 -----------------------
27 - [Rustc will now search for custom JSON targets in
28 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
29 directory.][83800] You can find your sysroot directory by running
30 `rustc --print sysroot`.
31 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
32 - [You can now use `#[target_feature]` on safe functions when targeting
33 WebAssembly platforms.][84988]
34 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
35 - [Added tier 3\* support for `bpfel-unknown-none`
36 and `bpfeb-unknown-none`.][79608]
37 - [Added tier 3 support for `powerpc64le-unknown-freebsd`.][83572]
40 -----------------------
42 - [You can now explicitly import the prelude of different editions
43 through `std::prelude`. (e.g. `use std::prelude::rust_2021::*;`)][86294]
44 - [`panic::panic_any` will now `#[track_caller]`.][85745]
45 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
46 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
47 - [TODO: Bump stdarch submodule][83278]
52 - [`BTreeMap::into_keys`]
53 - [`BTreeMap::into_values`]
54 - [`HashMap::into_keys`]
55 - [`HashMap::into_values`]
56 - [`MaybeUninit::assume_init_mut`]
57 - [`MaybeUninit::assume_init_ref`]
59 - [`arch::x86::_bittest`]
60 - [`arch::x86::_bittestandcomplement`]
61 - [`arch::x86::_bittestandset`]
62 - [`arch::x86_64::_bittest`]
63 - [`arch::x86_64::_bittestandcomplement64`]
64 - [`arch::x86_64::_bittestandcomplement`]
65 - [`arch::x86_64::_bittestandreset64`]
66 - [`arch::x86_64::_bittestandset64`]
67 - [`arch::x86_64::_bittestandset`]
68 - [`ops::ControlFlow`]
69 - [`VecDeque::binary_search`]
70 - [`VecDeque::binary_search_by`]
71 - [`VecDeque::binary_search_by_key`]
72 - [`VecDeque::partition_point`]
75 -----------------------
77 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
78 the dependency graph.][cargo/9520]
79 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
80 in the tree ][cargo/9499]
81 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
82 macro dependencies.][cargo/9488]
83 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
84 This variable points to a directory that integration tests and benches
85 can use as a "scratchpad" for testing filesystem operations.
86 - [Configure hosts separately from targets when --target is specified.][cargo/9322]
87 - [Respect Cargo.toml `[package.exclude]` even not in a git repo.][cargo/9186]
89 [79608]: https://github.com/rust-lang/rust/pull/79608
90 [84988]: https://github.com/rust-lang/rust/pull/84988
91 [84701]: https://github.com/rust-lang/rust/pull/84701
92 [84072]: https://github.com/rust-lang/rust/pull/84072
93 [86294]: https://github.com/rust-lang/rust/pull/86294
94 [85745]: https://github.com/rust-lang/rust/pull/85745
95 [84744]: https://github.com/rust-lang/rust/pull/84744
96 [85078]: https://github.com/rust-lang/rust/pull/85078
97 [84717]: https://github.com/rust-lang/rust/pull/84717
98 [83800]: https://github.com/rust-lang/rust/pull/83800
99 [83366]: https://github.com/rust-lang/rust/pull/83366
100 [83278]: https://github.com/rust-lang/rust/pull/83278
101 [85292]: https://github.com/rust-lang/rust/pull/85292
102 [83572]: https://github.com/rust-lang/rust/pull/83572
103 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
104 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
105 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
106 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
107 [cargo/9322]: https://github.com/rust-lang/cargo/pull/9322
108 [cargo/9186]: https://github.com/rust-lang/cargo/pull/9186
109 [`arch::x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
110 [`arch::x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
111 [`arch::x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
112 [`arch::x86_64::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest.html
113 [`arch::x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
114 [`arch::x86_64::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement.html
115 [`arch::x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
116 [`arch::x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
117 [`arch::x86_64::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset.html
118 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
119 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
120 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
121 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
122 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html#method.assume_init_ref
123 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html#method.assume_init_mut
124 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
125 [`ops::ControlFlow`]: https://doc.rust-lang.org/std/ops/enum.ControlFlow.html
126 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
127 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
129 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
131 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
133 Version 1.53.0 (2021-06-17)
134 ============================
137 -----------------------
138 - [You can now use unicode for identifiers.][83799] This allows multilingual
139 identifiers but still doesn't allow glyphs that are not considered characters
140 such as `◆` or `🦀`. More specifically you can now use any identifier that
141 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
142 is the same standard as languages like Python, however Rust uses NFC
143 normalization which may be different from other languages.
144 - [You can now specify "or patterns" inside pattern matches.][79278]
145 Previously you could only use `|` (OR) on complete patterns. E.g.
149 matches!(x, Some(1) | Some(2));
151 matches!(x, Some(1 | 2));
153 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
154 has the same semantics as the `:pat` matcher. This is to allow `:pat`
155 to change semantics to being a pattern fragment in a future edition.
158 -----------------------
159 - [Updated the minimum external LLVM version to LLVM 10.][83387]
160 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
161 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
163 \* Refer to Rust's [platform support page][platform-support-doc] for more
164 information on Rust's tiered platform support.
167 -----------------------
168 - [Abort messages will now forward to `android_set_abort_message` on
169 Android platforms when available.][81469]
170 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
171 - [Arrays of any length now implement `IntoIterator`.][84147]
172 Currently calling `.into_iter()` as a method on an array will
173 return `impl Iterator<Item=&T>`, but this may change in a
174 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
175 directly on arrays will provide `impl Iterator<Item=T>` as expected.
176 - [`leading_zeros`, and `trailing_zeros` are now available on all
177 `NonZero` integer types.][84082]
178 - [`{f32, f64}::from_str` now parse and print special values
179 (`NaN`, `-0`) according to IEEE RFC 754.][78618]
180 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
181 - [Add the `BITS` associated constant to all numeric types.][82565]
185 - [`AtomicBool::fetch_update`]
186 - [`AtomicPtr::fetch_update`]
187 - [`BTreeMap::retain`]
188 - [`BTreeSet::retain`]
189 - [`BufReader::seek_relative`]
190 - [`DebugStruct::non_exhaustive`]
193 - [`Duration::is_zero`]
194 - [`Duration::saturating_add`]
195 - [`Duration::saturating_mul`]
196 - [`Duration::saturating_sub`]
197 - [`ErrorKind::Unsupported`]
199 - [`Ordering::is_eq`]
200 - [`Ordering::is_ge`]
201 - [`Ordering::is_gt`]
202 - [`Ordering::is_le`]
203 - [`Ordering::is_lt`]
204 - [`Ordering::is_ne`]
205 - [`OsStr::is_ascii`]
206 - [`OsStr::make_ascii_lowercase`]
207 - [`OsStr::make_ascii_uppercase`]
208 - [`OsStr::to_ascii_lowercase`]
209 - [`OsStr::to_ascii_uppercase`]
210 - [`Peekable::peek_mut`]
211 - [`Rc::decrement_strong_count`]
212 - [`Rc::increment_strong_count`]
213 - [`Vec::extend_from_within`]
214 - [`array::from_mut`]
215 - [`array::from_ref`]
216 - [`cmp::max_by_key`]
218 - [`cmp::min_by_key`]
220 - [`f32::is_subnormal`]
221 - [`f64::is_subnormal`]
224 -----------------------
225 - [Cargo now supports git repositories where the default `HEAD` branch is not
226 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
227 which can handle default branches correctly.
228 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
229 - [The `authors` field is no longer included in `Cargo.toml` for new
230 projects.][cargo/9282]
233 -----------------------
234 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
235 without hyperlinks.][81764]
239 - [Implement token-based handling of attributes during expansion][82608]
240 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
241 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
242 to confusion and potential security vulnerabilities and [is no
243 longer recommended][ietf6943].
244 - [The added `BITS` constant may conflict with external definitions.][85667]
245 In particular, this was known to be a problem in the `lexical-core` crate,
246 but they have published fixes for semantic versions 0.4 through 0.7. To
247 update this dependency alone, use `cargo update -p lexical-core`.
248 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
252 These changes provide no direct user facing benefits, but represent significant
253 improvements to the internals and overall performance of rustc and
256 - [Rework the `std::sys::windows::alloc` implementation.][83065]
257 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
258 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
259 - [Rework rustdoc const type][82873]
261 [85667]: https://github.com/rust-lang/rust/pull/85667
262 [83386]: https://github.com/rust-lang/rust/pull/83386
263 [82771]: https://github.com/rust-lang/rust/pull/82771
264 [84147]: https://github.com/rust-lang/rust/pull/84147
265 [84082]: https://github.com/rust-lang/rust/pull/84082
266 [83799]: https://github.com/rust-lang/rust/pull/83799
267 [83681]: https://github.com/rust-lang/rust/pull/83681
268 [83652]: https://github.com/rust-lang/rust/pull/83652
269 [83387]: https://github.com/rust-lang/rust/pull/83387
270 [82873]: https://github.com/rust-lang/rust/pull/82873
271 [82864]: https://github.com/rust-lang/rust/pull/82864
272 [82608]: https://github.com/rust-lang/rust/pull/82608
273 [82565]: https://github.com/rust-lang/rust/pull/82565
274 [80525]: https://github.com/rust-lang/rust/pull/80525
275 [79278]: https://github.com/rust-lang/rust/pull/79278
276 [78618]: https://github.com/rust-lang/rust/pull/78618
277 [77704]: https://github.com/rust-lang/rust/pull/77704
278 [83941]: https://github.com/rust-lang/rust/pull/83941
279 [83065]: https://github.com/rust-lang/rust/pull/83065
280 [81764]: https://github.com/rust-lang/rust/pull/81764
281 [81469]: https://github.com/rust-lang/rust/pull/81469
282 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
283 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
284 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
285 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
286 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
287 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
288 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
289 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
290 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
291 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
292 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
293 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
294 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
295 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
296 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
297 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
298 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
299 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
300 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
301 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
302 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
303 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
304 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
305 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
306 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
307 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
308 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
309 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
310 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
311 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
312 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
313 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
314 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
315 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
316 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
317 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
318 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
319 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
320 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
321 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
322 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
323 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
326 Version 1.52.1 (2021-05-10)
327 ============================
329 This release disables incremental compilation, unless the user has explicitly
330 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
332 This is due to the widespread, and frequently occuring, breakage encountered by
333 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
334 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
335 newly added incremental verification are still present in past stable versions,
336 and are not yet fixed on any channel. These bugs can lead to miscompilation of
339 These problems only affect incremental builds, so release builds with Cargo
340 should not be affected unless the user has explicitly opted into incremental.
341 Debug and check builds are affected.
343 See [84970] for more details.
345 [84970]: https://github.com/rust-lang/rust/issues/84970
347 Version 1.52.0 (2021-05-06)
348 ============================
352 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
353 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
354 is allowed by default, and may become a warning or hard error in a
356 - [You can now cast mutable references to arrays to a pointer of the same type as
361 - [Upgraded the default LLVM to LLVM 12.][81451]
363 Added tier 3\* support for the following targets.
365 - [`s390x-unknown-linux-musl`][82166]
366 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
367 - [`powerpc-unknown-openbsd`][82733]
369 \* Refer to Rust's [platform support page][platform-support-doc] for more
370 information on Rust's tiered platform support.
374 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
375 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
376 - [`Arc<impl Error>` now implements `error::Error`.][80553]
377 - [All integer division and remainder operations are now `const`.][80962]
381 - [`Arguments::as_str`]
383 - [`char::REPLACEMENT_CHARACTER`]
384 - [`char::UNICODE_VERSION`]
385 - [`char::decode_utf16`]
386 - [`char::from_digit`]
387 - [`char::from_u32_unchecked`]
389 - [`slice::partition_point`]
390 - [`str::rsplit_once`]
391 - [`str::split_once`]
393 The following previously stable APIs are now `const`.
396 - [`char::len_utf16`]
397 - [`char::to_ascii_uppercase`]
398 - [`char::to_ascii_lowercase`]
399 - [`char::eq_ignore_ascii_case`]
400 - [`u8::to_ascii_uppercase`]
401 - [`u8::to_ascii_lowercase`]
402 - [`u8::eq_ignore_ascii_case`]
406 - [Rustdoc lints are now treated as a tool lint, meaning that
407 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
408 Using the old style is still allowed, and will become a warning in
410 - [Rustdoc now supports argument files.][82261]
411 - [Rustdoc now generates smart punctuation for documentation.][79423]
412 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
420 - [You can now pass multiple filters to tests.][81356] E.g.
421 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
422 - [Rustup now distributes PDB symbols for the `std` library on Windows,
423 allowing you to see `std` symbols when debugging.][82218]
427 These changes provide no direct user facing benefits, but represent significant
428 improvements to the internals and overall performance of rustc and
431 - [Check the result cache before the DepGraph when ensuring queries][81855]
432 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
433 - [Only store a LocalDefId in some HIR nodes][81611]
434 - [Store HIR attributes in a side table][79519]
438 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
439 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
440 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
441 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
442 languages in code blocks.][78429]
443 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
444 - [Changes in how proc macros handle whitespace may lead to panics when used
445 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
446 - [Turn `#[derive]` into a regular macro attribute][79078]
448 [84136]: https://github.com/rust-lang/rust/issues/84136
449 [80763]: https://github.com/rust-lang/rust/pull/80763
450 [82166]: https://github.com/rust-lang/rust/pull/82166
451 [82121]: https://github.com/rust-lang/rust/pull/82121
452 [81879]: https://github.com/rust-lang/rust/pull/81879
453 [82261]: https://github.com/rust-lang/rust/pull/82261
454 [82218]: https://github.com/rust-lang/rust/pull/82218
455 [82216]: https://github.com/rust-lang/rust/pull/82216
456 [82202]: https://github.com/rust-lang/rust/pull/82202
457 [81855]: https://github.com/rust-lang/rust/pull/81855
458 [81766]: https://github.com/rust-lang/rust/pull/81766
459 [81744]: https://github.com/rust-lang/rust/pull/81744
460 [81611]: https://github.com/rust-lang/rust/pull/81611
461 [81479]: https://github.com/rust-lang/rust/pull/81479
462 [81451]: https://github.com/rust-lang/rust/pull/81451
463 [81356]: https://github.com/rust-lang/rust/pull/81356
464 [80962]: https://github.com/rust-lang/rust/pull/80962
465 [80553]: https://github.com/rust-lang/rust/pull/80553
466 [80527]: https://github.com/rust-lang/rust/pull/80527
467 [79519]: https://github.com/rust-lang/rust/pull/79519
468 [79423]: https://github.com/rust-lang/rust/pull/79423
469 [79208]: https://github.com/rust-lang/rust/pull/79208
470 [78429]: https://github.com/rust-lang/rust/pull/78429
471 [82733]: https://github.com/rust-lang/rust/pull/82733
472 [82594]: https://github.com/rust-lang/rust/pull/82594
473 [79078]: https://github.com/rust-lang/rust/pull/79078
474 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
475 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
476 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
477 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
478 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
479 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
480 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
481 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
482 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
483 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
484 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
485 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
486 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
487 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
488 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
489 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
490 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
491 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
492 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
493 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
494 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
495 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
497 Version 1.51.0 (2021-03-25)
498 ============================
502 - [You can now parameterize items such as functions, traits, and `struct`s by constant
503 values in addition to by types and lifetimes.][79135] Also known as "const generics"
504 E.g. you can now write the following. Note: Only values of primitive integers,
505 `bool`, or `char` types are currently permitted.
507 struct GenericArray<T, const LENGTH: usize> {
511 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
512 const fn last(&self) -> Option<&T> {
516 Some(&self.inner[LENGTH - 1])
526 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
527 This option controls whether debug information is split across multiple files
528 or packed into a single file. **Note** This option is unstable on other platforms.
529 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
530 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
531 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
532 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
534 \* Refer to Rust's [platform support page][platform-support-doc] for more
535 information on Rust's tiered platform support.
540 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
541 - [`str` now implements `AsMut<str>`.][80279]
542 - [`u64` and `u128` now implement `From<char>`.][79502]
543 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
544 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
545 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
546 - [`io::Empty` now implements `io::Seek`.][78044]
547 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
548 `T: ?Sized` types.][80764]
549 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
555 - [`Arc::decrement_strong_count`]
556 - [`Arc::increment_strong_count`]
557 - [`Once::call_once_force`]
558 - [`Peekable::next_if_eq`]
559 - [`Peekable::next_if`]
560 - [`Seek::stream_position`]
561 - [`array::IntoIter`]
562 - [`panic::panic_any`]
564 - [`ptr::addr_of_mut!`]
565 - [`slice::fill_with`]
566 - [`slice::split_inclusive_mut`]
567 - [`slice::split_inclusive`]
568 - [`slice::strip_prefix`]
569 - [`slice::strip_suffix`]
570 - [`str::split_inclusive`]
571 - [`sync::OnceState`]
573 - [`VecDeque::range`]
574 - [`VecDeque::range_mut`]
578 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
579 codegen option.][cargo/9112]
580 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
581 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
582 to avoid unifying features of dependencies where that unification could be unwanted.
583 Such as using the same dependency with a `std` feature in a build scripts and
584 proc-macros, while using the `no-std` feature in the final binary. See the
585 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
590 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
591 - [You can now provide a `--default-theme` flag which sets the default theme to use for
592 documentation.][79642]
594 Various improvements to intra-doc links:
596 - [You can link to non-path primitives such as `slice`.][80181]
597 - [You can link to associated items.][74489]
598 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
602 - [You can now pass `--include-ignored` to tests (e.g. with
603 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
608 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
609 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
611 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
612 for the distributed artifacts.][81521]
613 - `armv5te-unknown-linux-gnueabi`
614 - `sparc64-unknown-linux-gnu`
615 - `thumbv7neon-unknown-linux-gnueabihf`
616 - `armv7-unknown-linux-gnueabi`
617 - `x86_64-unknown-linux-gnux32`
618 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
623 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
625 [79135]: https://github.com/rust-lang/rust/pull/79135
626 [74489]: https://github.com/rust-lang/rust/pull/74489
627 [76934]: https://github.com/rust-lang/rust/pull/76934
628 [79570]: https://github.com/rust-lang/rust/pull/79570
629 [80181]: https://github.com/rust-lang/rust/pull/80181
630 [79642]: https://github.com/rust-lang/rust/pull/79642
631 [80945]: https://github.com/rust-lang/rust/pull/80945
632 [80279]: https://github.com/rust-lang/rust/pull/80279
633 [80053]: https://github.com/rust-lang/rust/pull/80053
634 [79502]: https://github.com/rust-lang/rust/pull/79502
635 [75180]: https://github.com/rust-lang/rust/pull/75180
636 [79135]: https://github.com/rust-lang/rust/pull/79135
637 [81521]: https://github.com/rust-lang/rust/pull/81521
638 [80968]: https://github.com/rust-lang/rust/pull/80968
639 [80959]: https://github.com/rust-lang/rust/pull/80959
640 [80718]: https://github.com/rust-lang/rust/pull/80718
641 [80653]: https://github.com/rust-lang/rust/pull/80653
642 [80579]: https://github.com/rust-lang/rust/pull/80579
643 [79998]: https://github.com/rust-lang/rust/pull/79998
644 [78044]: https://github.com/rust-lang/rust/pull/78044
645 [81455]: https://github.com/rust-lang/rust/pull/81455
646 [80764]: https://github.com/rust-lang/rust/pull/80764
647 [80749]: https://github.com/rust-lang/rust/pull/80749
648 [80662]: https://github.com/rust-lang/rust/pull/80662
649 [79134]: https://github.com/rust-lang/rust/pull/79134
650 [80966]: https://github.com/rust-lang/rust/pull/80966
651 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
652 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
653 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
654 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
655 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
656 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
657 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
658 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
659 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
660 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
661 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
662 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
663 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
664 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
665 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
666 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
667 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
668 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
669 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
670 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
671 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
672 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
673 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
675 Version 1.50.0 (2021-02-11)
676 ============================
679 -----------------------
680 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
681 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
682 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
685 -----------------------
686 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
687 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
688 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
689 - [Dropped support for all cloudabi targets.][78439]
691 \* Refer to Rust's [platform support page][platform-support-doc] for more
692 information on Rust's tiered platform support.
695 -----------------------
697 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
698 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
699 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
700 This value cannot be a valid file descriptor, and now means `Option<File>` takes
701 up the same amount of space as `File`.
707 - [`btree_map::Entry::or_insert_with_key`]
710 - [`hash_map::Entry::or_insert_with_key`]
714 - [`UnsafeCell::get_mut`]
716 The following previously stable methods are now `const`.
718 - [`IpAddr::is_ipv4`]
719 - [`IpAddr::is_ipv6`]
720 - [`IpAddr::is_unspecified`]
721 - [`IpAddr::is_loopback`]
722 - [`IpAddr::is_multicast`]
723 - [`Ipv4Addr::octets`]
724 - [`Ipv4Addr::is_loopback`]
725 - [`Ipv4Addr::is_private`]
726 - [`Ipv4Addr::is_link_local`]
727 - [`Ipv4Addr::is_multicast`]
728 - [`Ipv4Addr::is_broadcast`]
729 - [`Ipv4Addr::is_documentation`]
730 - [`Ipv4Addr::to_ipv6_compatible`]
731 - [`Ipv4Addr::to_ipv6_mapped`]
732 - [`Ipv6Addr::segments`]
733 - [`Ipv6Addr::is_unspecified`]
734 - [`Ipv6Addr::is_loopback`]
735 - [`Ipv6Addr::is_multicast`]
736 - [`Ipv6Addr::to_ipv4`]
739 - [`Layout::from_size_align`]
740 - `pow` for all integer types.
741 - `checked_pow` for all integer types.
742 - `saturating_pow` for all integer types.
743 - `wrapping_pow` for all integer types.
744 - `next_power_of_two` for all unsigned integer types.
745 - `checked_next_power_of_two` for all unsigned integer types.
748 -----------------------
750 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
751 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
752 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
753 contents of that directory for changes.][cargo/8973]
754 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
759 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
760 - [Running tests will now print the total time taken to execute.][75752]
765 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
766 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
767 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
768 unhygenic `macro_rules!` macros.][79472]
769 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
770 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
771 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
772 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
773 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
774 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
776 [74989]: https://github.com/rust-lang/rust/pull/74989
777 [79261]: https://github.com/rust-lang/rust/pull/79261
778 [79896]: https://github.com/rust-lang/rust/pull/79896
779 [79484]: https://github.com/rust-lang/rust/pull/79484
780 [79472]: https://github.com/rust-lang/rust/pull/79472
781 [79270]: https://github.com/rust-lang/rust/pull/79270
782 [79003]: https://github.com/rust-lang/rust/pull/79003
783 [78864]: https://github.com/rust-lang/rust/pull/78864
784 [78636]: https://github.com/rust-lang/rust/pull/78636
785 [78439]: https://github.com/rust-lang/rust/pull/78439
786 [78343]: https://github.com/rust-lang/rust/pull/78343
787 [78296]: https://github.com/rust-lang/rust/pull/78296
788 [78068]: https://github.com/rust-lang/rust/pull/78068
789 [75752]: https://github.com/rust-lang/rust/pull/75752
790 [74699]: https://github.com/rust-lang/rust/pull/74699
791 [78142]: https://github.com/rust-lang/rust/pull/78142
792 [77484]: https://github.com/rust-lang/rust/pull/77484
793 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
794 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
795 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
796 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
797 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
798 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
799 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
800 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
801 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
802 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
803 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
804 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
805 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
806 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
807 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
808 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
809 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
810 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
811 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
812 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
813 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
814 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
815 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
816 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
817 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
818 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
819 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
820 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
821 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
822 [`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
823 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
824 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
825 [`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
826 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
829 Version 1.49.0 (2020-12-31)
830 ============================
833 -----------------------
835 - [Unions can now implement `Drop`, and you can now have a field in a union
836 with `ManuallyDrop<T>`.][77547]
837 - [You can now cast uninhabited enums to integers.][76199]
838 - [You can now bind by reference and by move in patterns.][76119] This
839 allows you to selectively borrow individual components of a type. E.g.
847 let person = Person {
848 name: String::from("Alice"),
852 // `name` is moved out of person, but `age` is referenced.
853 let Person { name, ref age } = person;
854 println!("{} {}", name, age);
858 -----------------------
860 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
861 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
862 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
863 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
864 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
865 - [Output from threads spawned in tests is now captured.][78227]
866 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
868 \* Refer to Rust's [platform support page][platform-support-doc] for more
869 information on Rust's tiered platform support.
872 -----------------------
874 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
875 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
880 - [`slice::select_nth_unstable`]
881 - [`slice::select_nth_unstable_by`]
882 - [`slice::select_nth_unstable_by_key`]
884 The following previously stable methods are now `const`.
887 - [`Poll::is_pending`]
890 -----------------------
891 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
892 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
893 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
894 variable will be set if the crate being built is one the user selected to build, either
895 with `-p` or through defaults.
896 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
902 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
903 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
904 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
905 Previously such invalid or unused attributes could be ignored.
906 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
907 read [this post about the changes][rustdoc-ws-post] for more details.
908 - [Trait bounds are no longer inferred for associated types.][79904]
912 These changes provide no direct user facing benefits, but represent significant
913 improvements to the internals and overall performance of rustc and
916 - [rustc's internal crates are now compiled using the `initial-exec` Thread
917 Local Storage model.][78201]
918 - [Calculate visibilities once in resolve.][78077]
919 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
920 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
923 [75991]: https://github.com/rust-lang/rust/pull/75991
924 [78951]: https://github.com/rust-lang/rust/pull/78951
925 [78848]: https://github.com/rust-lang/rust/pull/78848
926 [78746]: https://github.com/rust-lang/rust/pull/78746
927 [78376]: https://github.com/rust-lang/rust/pull/78376
928 [78228]: https://github.com/rust-lang/rust/pull/78228
929 [78227]: https://github.com/rust-lang/rust/pull/78227
930 [78201]: https://github.com/rust-lang/rust/pull/78201
931 [78109]: https://github.com/rust-lang/rust/pull/78109
932 [78077]: https://github.com/rust-lang/rust/pull/78077
933 [77997]: https://github.com/rust-lang/rust/pull/77997
934 [77703]: https://github.com/rust-lang/rust/pull/77703
935 [77547]: https://github.com/rust-lang/rust/pull/77547
936 [77015]: https://github.com/rust-lang/rust/pull/77015
937 [76199]: https://github.com/rust-lang/rust/pull/76199
938 [76119]: https://github.com/rust-lang/rust/pull/76119
939 [75914]: https://github.com/rust-lang/rust/pull/75914
940 [79004]: https://github.com/rust-lang/rust/pull/79004
941 [78676]: https://github.com/rust-lang/rust/pull/78676
942 [79904]: https://github.com/rust-lang/rust/issues/79904
943 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
944 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
945 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
946 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
947 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
948 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
949 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
950 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
951 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
952 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
953 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
955 Version 1.48.0 (2020-11-19)
956 ==========================
961 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
962 is still rejected *semantically*, but can now be parsed by procedural macros.
966 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
967 `rustc` whether to link its own C runtime and libraries or to rely on a external
968 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
969 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
970 Note: If you're using cargo you must explicitly pass the `--target` flag.
971 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
973 \* Refer to Rust's [platform support page][platform-support-doc] for more
974 information on Rust's tiered platform support.
978 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
979 and `&Stderr`.][76275]
980 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
981 - [The `matches!` macro now supports having a trailing comma.][74880]
982 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
983 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
987 - [`slice::as_ptr_range`]
988 - [`slice::as_mut_ptr_range`]
989 - [`VecDeque::make_contiguous`]
990 - [`future::pending`]
993 The following previously stable methods are now `const fn`'s:
995 - [`Option::is_some`]
996 - [`Option::is_none`]
1000 - [`Result::as_ref`]
1001 - [`Ordering::reverse`]
1002 - [`Ordering::then`]
1009 - [You can now link to items in `rustdoc` using the intra-doc link
1010 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1011 a link to `std::future`'s documentation. See ["Linking to items by
1012 name"][intradoc-links] for more information.
1013 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1014 when searching through `rustdoc`'s UI.][75740]
1018 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1019 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1020 promoted to `'static` lifetime any more inside `const fn`s.
1021 - [Associated type bindings on trait objects are now verified to meet the bounds
1022 declared on the trait when checking that they implement the trait.][27675]
1023 - [When trait bounds on associated types or opaque types are ambiguous, the
1024 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1025 - [Fixed recursive nonterminals not being expanded in macros during
1026 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1027 correctly handling recursive nonterminal tokens.
1028 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1029 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1030 in places where they have no effect.][73461]
1031 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1032 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1033 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1034 disallow zero-initialization.][71274]
1035 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1036 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1037 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1038 see the [`catch_unwind`] documentation for further information.
1044 These changes provide no direct user facing benefits, but represent significant
1045 improvements to the internals and overall performance of rustc and
1048 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1049 You can continue building with `make` by setting `ninja=false` in
1051 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1052 - [Made `ensure_sufficient_stack()` non-generic][76680]
1054 [78143]: https://github.com/rust-lang/rust/issues/78143
1055 [76680]: https://github.com/rust-lang/rust/pull/76680/
1056 [76030]: https://github.com/rust-lang/rust/pull/76030/
1057 [70212]: https://github.com/rust-lang/rust/pull/70212/
1058 [27675]: https://github.com/rust-lang/rust/issues/27675/
1059 [54121]: https://github.com/rust-lang/rust/issues/54121/
1060 [71274]: https://github.com/rust-lang/rust/pull/71274/
1061 [77386]: https://github.com/rust-lang/rust/pull/77386/
1062 [77153]: https://github.com/rust-lang/rust/pull/77153/
1063 [77055]: https://github.com/rust-lang/rust/pull/77055/
1064 [76275]: https://github.com/rust-lang/rust/pull/76275/
1065 [76310]: https://github.com/rust-lang/rust/pull/76310/
1066 [76420]: https://github.com/rust-lang/rust/pull/76420/
1067 [76158]: https://github.com/rust-lang/rust/pull/76158/
1068 [75857]: https://github.com/rust-lang/rust/pull/75857/
1069 [75585]: https://github.com/rust-lang/rust/pull/75585/
1070 [75740]: https://github.com/rust-lang/rust/pull/75740/
1071 [75502]: https://github.com/rust-lang/rust/pull/75502/
1072 [74880]: https://github.com/rust-lang/rust/pull/74880/
1073 [74922]: https://github.com/rust-lang/rust/pull/74922/
1074 [74430]: https://github.com/rust-lang/rust/pull/74430/
1075 [74194]: https://github.com/rust-lang/rust/pull/74194/
1076 [73461]: https://github.com/rust-lang/rust/pull/73461/
1077 [73166]: https://github.com/rust-lang/rust/pull/73166/
1078 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1079 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1080 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1081 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1082 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1083 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1084 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1085 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1086 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1087 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1088 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1089 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1090 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1091 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1092 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1095 Version 1.47.0 (2020-10-08)
1096 ==========================
1100 - [Closures will now warn when not used.][74869]
1104 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1105 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1107 - [Upgraded to LLVM 11.][73526]
1108 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1109 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1110 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1112 \* Refer to Rust's [platform support page][platform-support-doc] for more
1113 information on Rust's tiered platform support.
1117 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1118 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1119 those of length less than 33.][74060]
1120 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1121 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1122 `PartialEq`, and `PartialOrd`.][73583]
1126 - [`Ident::new_raw`]
1127 - [`Range::is_empty`]
1128 - [`RangeInclusive::is_empty`]
1129 - [`Result::as_deref`]
1130 - [`Result::as_deref_mut`]
1132 - [`pointer::offset_from`]
1136 The following previously stable APIs have now been made const.
1138 - [The `new` method for all `NonZero` integers.][73858]
1139 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1140 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1141 methods for all integers.][73858]
1142 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1143 signed integers.][73858]
1144 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1145 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1146 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1147 `is_ascii_control` methods for `char` and `u8`.][73858]
1151 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1152 You can override this by setting the following in your `Cargo.toml`.
1154 [profile.release.build-override]
1157 - [`cargo-help` will now display man pages for commands rather just the
1158 `--help` text.][cargo/8456]
1159 - [`cargo-metadata` now emits a `test` field indicating if a target has
1160 tests enabled.][cargo/8478]
1161 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1162 - [`cargo-publish` will now use an alternative registry by default if it's the
1163 only registry specified in `package.publish`.][cargo/8571]
1167 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1168 type based search.][75366]
1169 - [Added the Ayu theme to rustdoc.][71237]
1173 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1174 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1175 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1176 help to preserve more span information.][73084] These changes may cause
1177 compiliation errors if your macro was unhygenic or didn't correctly handle
1179 - [Moved support for the CloudABI target to tier 3.][75568]
1180 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1181 - [Added the `rustc-docs` component.][75560] This allows you to install
1182 and read the documentation for the compiler internal APIs. (Currently only
1183 available for `x86_64-unknown-linux-gnu`.)
1188 - [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.
1190 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1191 [75048]: https://github.com/rust-lang/rust/pull/75048/
1192 [74163]: https://github.com/rust-lang/rust/pull/74163/
1193 [71237]: https://github.com/rust-lang/rust/pull/71237/
1194 [74869]: https://github.com/rust-lang/rust/pull/74869/
1195 [73858]: https://github.com/rust-lang/rust/pull/73858/
1196 [75716]: https://github.com/rust-lang/rust/pull/75716/
1197 [75908]: https://github.com/rust-lang/rust/pull/75908/
1198 [75516]: https://github.com/rust-lang/rust/pull/75516/
1199 [75560]: https://github.com/rust-lang/rust/pull/75560/
1200 [75568]: https://github.com/rust-lang/rust/pull/75568/
1201 [75366]: https://github.com/rust-lang/rust/pull/75366/
1202 [75204]: https://github.com/rust-lang/rust/pull/75204/
1203 [74650]: https://github.com/rust-lang/rust/pull/74650/
1204 [74419]: https://github.com/rust-lang/rust/pull/74419/
1205 [73964]: https://github.com/rust-lang/rust/pull/73964/
1206 [74021]: https://github.com/rust-lang/rust/pull/74021/
1207 [74060]: https://github.com/rust-lang/rust/pull/74060/
1208 [73893]: https://github.com/rust-lang/rust/pull/73893/
1209 [73526]: https://github.com/rust-lang/rust/pull/73526/
1210 [73583]: https://github.com/rust-lang/rust/pull/73583/
1211 [73084]: https://github.com/rust-lang/rust/pull/73084/
1212 [73197]: https://github.com/rust-lang/rust/pull/73197/
1213 [72488]: https://github.com/rust-lang/rust/pull/72488/
1214 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1215 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1216 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1217 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1218 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1219 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1220 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1221 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1222 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1223 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1224 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1225 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1226 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1227 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1228 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1231 Version 1.46.0 (2020-08-27)
1232 ==========================
1236 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1237 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1238 const functions.][73862]
1239 - [The `#[track_caller]` attribute can now be added to functions to use the
1240 function's caller's location information for panic messages.][72445]
1241 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1242 `x.0.0` over `(x.0).0`.
1243 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1244 You currently can't use `mem::transmute` in constant functions.
1248 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1249 - [Enabled static "Position Independent Executables" by default
1250 for `x86_64-unknown-linux-musl`.][70740]
1254 - [`mem::forget` is now a `const fn`.][73887]
1255 - [`String` now implements `From<char>`.][73466]
1256 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1257 integer types.][73032]
1258 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1259 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1260 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1261 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1262 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1263 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1268 - [`vec::Drain::as_slice`]
1272 Added a number of new environment variables that are now available when
1273 compiling your crate.
1275 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1276 the specific binary being compiled and the name of the crate.
1277 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1278 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1282 - [The target configuration option `abi_blacklist` has been renamed
1283 to `unsupported_abis`.][74150] The old name will still continue to work.
1284 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1285 This was previously accepted but will become a hard error in a future release.
1286 - [Rustc will fail to compile if you have a struct with
1287 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1289 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1290 ensure that spans have the correct information, and may cause breakage if you
1291 were relying on receiving spans with dummy information.
1292 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1293 a legacy installer that was replaced by a MSI installer a few years ago but
1294 was still being built.
1295 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1296 - [Rustc will no longer accept overlapping trait implementations that only
1297 differ in how the lifetime was bound.][72493]
1298 - [Rustc now correctly relates the lifetime of an existential associated
1299 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1300 you to pass a shorter lifetime than expected.
1301 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1302 The library will need to be installed for `rustc` to work, even though we
1303 expect it to be already available on most systems.
1304 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1306 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1307 exact output returned by rustc's pretty printing is an unstable
1308 implementation detail: we recommend any macro relying on it to switch to a
1309 more robust parsing system.
1311 [75453]: https://github.com/rust-lang/rust/issues/75453/
1312 [74820]: https://github.com/rust-lang/rust/issues/74820/
1313 [74420]: https://github.com/rust-lang/rust/issues/74420/
1314 [74109]: https://github.com/rust-lang/rust/pull/74109/
1315 [74150]: https://github.com/rust-lang/rust/pull/74150/
1316 [73862]: https://github.com/rust-lang/rust/pull/73862/
1317 [73887]: https://github.com/rust-lang/rust/pull/73887/
1318 [73466]: https://github.com/rust-lang/rust/pull/73466/
1319 [73516]: https://github.com/rust-lang/rust/pull/73516/
1320 [73293]: https://github.com/rust-lang/rust/pull/73293/
1321 [73007]: https://github.com/rust-lang/rust/pull/73007/
1322 [73032]: https://github.com/rust-lang/rust/pull/73032/
1323 [72920]: https://github.com/rust-lang/rust/pull/72920/
1324 [72569]: https://github.com/rust-lang/rust/pull/72569/
1325 [72583]: https://github.com/rust-lang/rust/pull/72583/
1326 [72584]: https://github.com/rust-lang/rust/pull/72584/
1327 [72717]: https://github.com/rust-lang/rust/pull/72717/
1328 [72437]: https://github.com/rust-lang/rust/pull/72437/
1329 [72445]: https://github.com/rust-lang/rust/pull/72445/
1330 [72486]: https://github.com/rust-lang/rust/pull/72486/
1331 [72493]: https://github.com/rust-lang/rust/pull/72493/
1332 [72331]: https://github.com/rust-lang/rust/pull/72331/
1333 [71896]: https://github.com/rust-lang/rust/pull/71896/
1334 [71660]: https://github.com/rust-lang/rust/pull/71660/
1335 [71322]: https://github.com/rust-lang/rust/pull/71322/
1336 [70740]: https://github.com/rust-lang/rust/pull/70740/
1337 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1338 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1339 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1340 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1341 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1344 Version 1.45.2 (2020-08-03)
1345 ==========================
1347 * [Fix bindings in tuple struct patterns][74954]
1348 * [Fix track_caller integration with trait objects][74784]
1350 [74954]: https://github.com/rust-lang/rust/issues/74954
1351 [74784]: https://github.com/rust-lang/rust/issues/74784
1354 Version 1.45.1 (2020-07-30)
1355 ==========================
1357 * [Fix const propagation with references.][73613]
1358 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1359 * [Avoid spurious implicit region bound.][74509]
1360 * [Install clippy on x.py install][74457]
1362 [73613]: https://github.com/rust-lang/rust/pull/73613
1363 [73078]: https://github.com/rust-lang/rust/issues/73078
1364 [74509]: https://github.com/rust-lang/rust/pull/74509
1365 [74457]: https://github.com/rust-lang/rust/pull/74457
1368 Version 1.45.0 (2020-07-16)
1369 ==========================
1373 - [Out of range float to int conversions using `as` has been defined as a saturating
1374 conversion.][71269] This was previously undefined behaviour, but you can use the
1375 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1376 may be desirable in rare performance sensitive situations.
1377 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1378 using `u64`.][70705]
1379 - [Function like procedural macros can now be used in expression, pattern, and statement
1380 positions.][68717] This means you can now use a function-like procedural macro
1381 anywhere you can use a declarative (`macro_rules!`) macro.
1385 - [You can now override individual target features through the `target-feature`
1386 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1387 equivalent to `-C target-feature=+avx2,+fma`.
1388 - [Added the `force-unwind-tables` flag.][69984] This option allows
1389 rustc to always generate unwind tables regardless of panic strategy.
1390 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1391 to include LLVM bitcode into generated `rlib`s (this is on by default).
1392 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1393 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1394 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1395 - [Upgraded to LLVM 10.][67759]
1397 \* Refer to Rust's [platform support page][platform-support-doc] for more
1398 information on Rust's tiered platform support.
1403 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1405 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1406 - [You can now use `char` with
1407 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1408 a range of codepoints.][72413] E.g.
1409 you can now write the following;
1411 for ch in 'a'..='z' {
1415 // Prints "abcdefghijklmnopqrstuvwxyz"
1417 - [`OsString` now implements `FromStr`.][71662]
1418 - [The `saturating_neg` method has been added to all signed integer primitive
1419 types, and the `saturating_abs` method has been added for all integer
1420 primitive types.][71886]
1421 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1422 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1424 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1425 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1426 integer types.][69813]
1427 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1428 integer types.][72324]
1429 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1434 - [`BTreeMap::remove_entry`]
1436 - [`rc::Weak::as_ptr`]
1437 - [`rc::Weak::from_raw`]
1438 - [`rc::Weak::into_raw`]
1439 - [`str::strip_prefix`]
1440 - [`str::strip_suffix`]
1441 - [`sync::Weak::as_ptr`]
1442 - [`sync::Weak::from_raw`]
1443 - [`sync::Weak::into_raw`]
1444 - [`char::UNICODE_VERSION`]
1445 - [`Span::resolved_at`]
1446 - [`Span::located_at`]
1447 - [`Span::mixed_site`]
1448 - [`unix::process::CommandExt::arg0`]
1453 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1458 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1459 `~~outdated information~~` becomes "~~outdated information~~".
1460 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1464 - [Trying to self initialize a static value (that is creating a value using
1465 itself) is unsound and now causes a compile error.][71140]
1466 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1467 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1468 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1469 previously undocumented and not intended for public use. Rustdoc still provides
1470 a non-zero exit code on errors.
1471 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1472 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1473 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1474 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1475 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1479 - [Make clippy a git subtree instead of a git submodule][70655]
1480 - [Unify the undo log of all snapshot types][69464]
1482 [71848]: https://github.com/rust-lang/rust/issues/71848/
1483 [73420]: https://github.com/rust-lang/rust/issues/73420/
1484 [72324]: https://github.com/rust-lang/rust/pull/72324/
1485 [71843]: https://github.com/rust-lang/rust/pull/71843/
1486 [71886]: https://github.com/rust-lang/rust/pull/71886/
1487 [72234]: https://github.com/rust-lang/rust/pull/72234/
1488 [72239]: https://github.com/rust-lang/rust/pull/72239/
1489 [72397]: https://github.com/rust-lang/rust/pull/72397/
1490 [72413]: https://github.com/rust-lang/rust/pull/72413/
1491 [72014]: https://github.com/rust-lang/rust/pull/72014/
1492 [72062]: https://github.com/rust-lang/rust/pull/72062/
1493 [72094]: https://github.com/rust-lang/rust/pull/72094/
1494 [72133]: https://github.com/rust-lang/rust/pull/72133/
1495 [67759]: https://github.com/rust-lang/rust/pull/67759/
1496 [71900]: https://github.com/rust-lang/rust/pull/71900/
1497 [71928]: https://github.com/rust-lang/rust/pull/71928/
1498 [71662]: https://github.com/rust-lang/rust/pull/71662/
1499 [71716]: https://github.com/rust-lang/rust/pull/71716/
1500 [71447]: https://github.com/rust-lang/rust/pull/71447/
1501 [71269]: https://github.com/rust-lang/rust/pull/71269/
1502 [71095]: https://github.com/rust-lang/rust/pull/71095/
1503 [71140]: https://github.com/rust-lang/rust/pull/71140/
1504 [70655]: https://github.com/rust-lang/rust/pull/70655/
1505 [70705]: https://github.com/rust-lang/rust/pull/70705/
1506 [69984]: https://github.com/rust-lang/rust/pull/69984/
1507 [69813]: https://github.com/rust-lang/rust/pull/69813/
1508 [69464]: https://github.com/rust-lang/rust/pull/69464/
1509 [68717]: https://github.com/rust-lang/rust/pull/68717/
1510 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1511 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1512 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1513 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1514 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1515 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1516 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1517 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1518 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1519 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1520 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1521 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1522 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1523 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1524 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1525 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1526 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1529 Version 1.44.1 (2020-06-18)
1530 ===========================
1532 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1533 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1534 * [Fix crashes when finding backtrace on macOS.][71397]
1535 * [Clippy applies lint levels into different files.][clippy/5356]
1537 [71397]: https://github.com/rust-lang/rust/issues/71397
1538 [73078]: https://github.com/rust-lang/rust/issues/73078
1539 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1540 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1543 Version 1.44.0 (2020-06-04)
1544 ==========================
1548 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1549 - [Added the `unused_braces` lint.][70081]
1551 **Syntax-only changes**
1553 - [Expansion-driven outline module parsing][69838]
1558 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1563 These are still rejected semantically, so you will likely receive an error but
1564 these changes can be seen and parsed by macros and conditional compilation.
1568 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1569 Additionally when in incremental mode rustc defaults to 256 codegen units.
1570 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1571 a panic is thrown.][67502]
1572 - [Added tier 3\* support for the `aarch64-unknown-none` and
1573 `aarch64-unknown-none-softfloat` targets.][68334]
1574 - [Added tier 3 support for `arm64-apple-tvos` and
1575 `x86_64-apple-tvos` targets.][68191]
1580 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1581 `vec![]` to be able to be used in `const` contexts.
1582 - [`convert::Infallible` now implements `Hash`.][70281]
1583 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1584 a `&mut OsStr`.][70048]
1585 - [Unicode 13 is now supported.][69929]
1586 - [`String` now implements `From<&mut str>`.][69661]
1587 - [`IoSlice` now implements `Copy`.][69403]
1588 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1589 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1590 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1591 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1592 integer types.][69373]
1596 - [`PathBuf::with_capacity`]
1597 - [`PathBuf::capacity`]
1598 - [`PathBuf::clear`]
1599 - [`PathBuf::reserve`]
1600 - [`PathBuf::reserve_exact`]
1601 - [`PathBuf::shrink_to_fit`]
1602 - [`f32::to_int_unchecked`]
1603 - [`f64::to_int_unchecked`]
1604 - [`Layout::align_to`]
1605 - [`Layout::pad_to_align`]
1607 - [`Layout::extend`]
1611 - [Added the `cargo tree` command which will print a tree graph of
1612 your dependencies.][cargo/8062] E.g.
1614 mdbook v0.3.2 (/Users/src/rust/mdbook)
1616 │ ├── html5ever v0.24.0
1618 │ │ │ └── cfg-if v0.1.9
1620 │ │ └── markup5ever v0.9.0
1621 │ │ ├── log v0.4.8 (*)
1623 │ │ │ └── phf_shared v0.7.24
1624 │ │ │ ├── siphasher v0.2.3
1625 │ │ │ └── unicase v1.4.2
1626 │ │ │ [build-dependencies]
1627 │ │ │ └── version_check v0.1.5
1630 You can also display dependencies on multiple versions of the same crate with
1631 `cargo tree -d` (short for `cargo tree --duplicates`).
1635 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1636 the version in the sidebar.][69494]
1640 - [Rustc now correctly generates static libraries on Windows GNU targets with
1641 the `.a` extension, rather than the previous `.lib`.][70937]
1642 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1643 - [The `file_name` property in JSON output of macro errors now points the actual
1644 source file rather than the previous format of `<NAME macros>`.][70969]
1645 **Note:** this may not point to a file that actually exists on the user's system.
1646 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1647 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1648 not allow zero initialization such as `NonZeroU8`.][66059] This was
1649 previously a warning.
1650 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1651 operator has been defined as a saturating operation.][71269] This was previously
1652 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1653 continue using the current behaviour, which may be desirable in rare performance
1654 sensitive situations.
1658 These changes provide no direct user facing benefits, but represent significant
1659 improvements to the internals and overall performance of rustc and
1662 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1663 - [Replace big JS dict with JSON parsing.][71250]
1665 [69373]: https://github.com/rust-lang/rust/pull/69373/
1666 [66059]: https://github.com/rust-lang/rust/pull/66059/
1667 [68191]: https://github.com/rust-lang/rust/pull/68191/
1668 [68899]: https://github.com/rust-lang/rust/pull/68899/
1669 [71147]: https://github.com/rust-lang/rust/pull/71147/
1670 [71250]: https://github.com/rust-lang/rust/pull/71250/
1671 [70937]: https://github.com/rust-lang/rust/pull/70937/
1672 [70969]: https://github.com/rust-lang/rust/pull/70969/
1673 [70632]: https://github.com/rust-lang/rust/pull/70632/
1674 [70281]: https://github.com/rust-lang/rust/pull/70281/
1675 [70345]: https://github.com/rust-lang/rust/pull/70345/
1676 [70048]: https://github.com/rust-lang/rust/pull/70048/
1677 [70081]: https://github.com/rust-lang/rust/pull/70081/
1678 [70156]: https://github.com/rust-lang/rust/pull/70156/
1679 [71269]: https://github.com/rust-lang/rust/pull/71269/
1680 [69838]: https://github.com/rust-lang/rust/pull/69838/
1681 [69929]: https://github.com/rust-lang/rust/pull/69929/
1682 [69661]: https://github.com/rust-lang/rust/pull/69661/
1683 [69778]: https://github.com/rust-lang/rust/pull/69778/
1684 [69494]: https://github.com/rust-lang/rust/pull/69494/
1685 [69403]: https://github.com/rust-lang/rust/pull/69403/
1686 [69033]: https://github.com/rust-lang/rust/pull/69033/
1687 [68692]: https://github.com/rust-lang/rust/pull/68692/
1688 [68334]: https://github.com/rust-lang/rust/pull/68334/
1689 [67502]: https://github.com/rust-lang/rust/pull/67502/
1690 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1691 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1692 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1693 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1694 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1695 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1696 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1697 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1698 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1699 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1700 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1701 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1702 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1705 Version 1.43.1 (2020-05-07)
1706 ===========================
1708 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1709 * [Fixed the stabilization of AVX-512 features.][71473]
1710 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1712 [71430]: https://github.com/rust-lang/rust/pull/71430
1713 [71473]: https://github.com/rust-lang/rust/issues/71473
1714 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1717 Version 1.43.0 (2020-04-23)
1718 ==========================
1722 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1723 the type inferred correctly.][68129]
1724 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1726 **Syntax only changes**
1727 - [Allow `type Foo: Ord` syntactically.][69361]
1728 - [Fuse associated and extern items up to defaultness.][69194]
1729 - [Syntactically allow `self` in all `fn` contexts.][68764]
1730 - [Merge `fn` syntax + cleanup item parsing.][68728]
1731 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1732 For example, you may now write:
1734 macro_rules! mac_trait {
1744 These are still rejected *semantically*, so you will likely receive an error but
1745 these changes can be seen and parsed by macros and
1746 conditional compilation.
1751 - [You can now pass multiple lint flags to rustc to override the previous
1752 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1753 everything in the `unused` lint group except `unused-variables` which
1754 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1755 everything in the `unused` lint group **including** `unused-variables` since
1756 the allow flag is specified before the deny flag (and therefore overridden).
1757 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1758 if they are available on `windows-gnu`.][67429]
1759 - [rustc now buffers errors/warnings printed in JSON.][69227]
1763 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1764 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1765 respectively.][69538] **Note** These conversions are only available when `N`
1767 - [You can now use associated constants on floats and integers directly, rather
1768 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1769 `f32::NAN` with no imports.
1770 - [`u8::is_ascii` is now `const`.][68984]
1771 - [`String` now implements `AsMut<str>`.][68742]
1772 - [Added the `primitive` module to `std` and `core`.][67637] This module
1773 reexports Rust's primitive types. This is mainly useful in macros
1774 where you want avoid these types being shadowed.
1775 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1776 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1780 - [`Once::is_completed`]
1785 - [`iter::once_with`]
1789 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1790 your environment.][cargo/7823]
1791 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1792 executable path when running integration tests or benchmarks.][cargo/7697]
1793 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1794 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1798 - [Certain checks in the `const_err` lint were deemed unrelated to const
1799 evaluation][69185], and have been moved to the `unconditional_panic` and
1800 `arithmetic_overflow` lints.
1805 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1806 has been a warning since 1.36.0.
1807 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1808 led to some instances being accepted, and now correctly emits a hard error.
1810 [69340]: https://github.com/rust-lang/rust/pull/69340
1814 These changes provide no direct user facing benefits, but represent significant
1815 improvements to the internals and overall performance of `rustc` and
1818 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1819 - [Improved how rustc generates drop code.][67332]
1820 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1821 - [traits: preallocate 2 Vecs of known initial size][69022]
1822 - [Avoid exponential behaviour when relating types][68772]
1823 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1824 - [Improve performance of coherence checks][68966]
1825 - [Deduplicate types in the generator witness][68672]
1826 - [Invert control in struct_lint_level.][68725]
1828 [67332]: https://github.com/rust-lang/rust/pull/67332/
1829 [67429]: https://github.com/rust-lang/rust/pull/67429/
1830 [67637]: https://github.com/rust-lang/rust/pull/67637/
1831 [67642]: https://github.com/rust-lang/rust/pull/67642/
1832 [67878]: https://github.com/rust-lang/rust/pull/67878/
1833 [67885]: https://github.com/rust-lang/rust/pull/67885/
1834 [68129]: https://github.com/rust-lang/rust/pull/68129/
1835 [68672]: https://github.com/rust-lang/rust/pull/68672/
1836 [68725]: https://github.com/rust-lang/rust/pull/68725/
1837 [68728]: https://github.com/rust-lang/rust/pull/68728/
1838 [68738]: https://github.com/rust-lang/rust/pull/68738/
1839 [68742]: https://github.com/rust-lang/rust/pull/68742/
1840 [68764]: https://github.com/rust-lang/rust/pull/68764/
1841 [68772]: https://github.com/rust-lang/rust/pull/68772/
1842 [68943]: https://github.com/rust-lang/rust/pull/68943/
1843 [68952]: https://github.com/rust-lang/rust/pull/68952/
1844 [68966]: https://github.com/rust-lang/rust/pull/68966/
1845 [68984]: https://github.com/rust-lang/rust/pull/68984/
1846 [69022]: https://github.com/rust-lang/rust/pull/69022/
1847 [69185]: https://github.com/rust-lang/rust/pull/69185/
1848 [69194]: https://github.com/rust-lang/rust/pull/69194/
1849 [69201]: https://github.com/rust-lang/rust/pull/69201/
1850 [69227]: https://github.com/rust-lang/rust/pull/69227/
1851 [69548]: https://github.com/rust-lang/rust/pull/69548/
1852 [69256]: https://github.com/rust-lang/rust/pull/69256/
1853 [69361]: https://github.com/rust-lang/rust/pull/69361/
1854 [69366]: https://github.com/rust-lang/rust/pull/69366/
1855 [69538]: https://github.com/rust-lang/rust/pull/69538/
1856 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1857 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1858 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1859 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1860 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1861 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1862 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1863 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1866 Version 1.42.0 (2020-03-12)
1867 ==========================
1871 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1873 fn foo(words: &[&str]) {
1875 ["Hello", "World", "!", ..] => println!("Hello World!"),
1876 ["Foo", "Bar", ..] => println!("Baz"),
1877 rest => println!("{:?}", rest),
1881 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1882 that you can create an enum that has the exact layout and ABI of the type
1884 - [You can now use outer attribute procedural macros on inline modules.][64273]
1885 - [There are some *syntax-only* changes:][67131]
1886 - `default` is syntactically allowed before items in `trait` definitions.
1887 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1888 leave out their bodies in favor of `;`.
1889 - Bounds on associated types in `impl`s are now syntactically allowed
1890 (e.g. `type Foo: Ord;`).
1891 - `...` (the C-variadic type) may occur syntactically directly as the type of
1892 any function parameter.
1894 These are still rejected *semantically*, so you will likely receive an error
1895 but these changes can be seen and parsed by procedural macros and
1896 conditional compilation.
1900 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1901 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1902 - [`Option::{expect,unwrap}` and
1903 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1904 pointing to the location where they were called, rather than
1905 `core`'s internals. ][67887]
1907 \* Refer to Rust's [platform support page][platform-support-doc] for more
1908 information on Rust's tiered platform support.
1912 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1913 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1914 to implement `Sized`.][67935]
1915 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1916 - [`Layout::new` is now `const`.][66254]
1917 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1922 - [`CondVar::wait_while`]
1923 - [`CondVar::wait_timeout_while`]
1925 - [`DebugMap::value`]
1926 - [`ManuallyDrop::take`]
1928 - [`ptr::slice_from_raw_parts_mut`]
1929 - [`ptr::slice_from_raw_parts`]
1933 - [You no longer need to include `extern crate proc_macro;` to be able to
1934 `use proc_macro;` in the `2018` edition.][cargo/7700]
1938 - [`Error::description` has been deprecated, and its use will now produce a
1939 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1941 [68253]: https://github.com/rust-lang/rust/pull/68253/
1942 [68348]: https://github.com/rust-lang/rust/pull/68348/
1943 [67935]: https://github.com/rust-lang/rust/pull/67935/
1944 [68339]: https://github.com/rust-lang/rust/pull/68339/
1945 [68122]: https://github.com/rust-lang/rust/pull/68122/
1946 [64273]: https://github.com/rust-lang/rust/pull/64273/
1947 [67712]: https://github.com/rust-lang/rust/pull/67712/
1948 [67887]: https://github.com/rust-lang/rust/pull/67887/
1949 [67131]: https://github.com/rust-lang/rust/pull/67131/
1950 [67233]: https://github.com/rust-lang/rust/pull/67233/
1951 [66899]: https://github.com/rust-lang/rust/pull/66899/
1952 [66919]: https://github.com/rust-lang/rust/pull/66919/
1953 [66254]: https://github.com/rust-lang/rust/pull/66254/
1954 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1955 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1956 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1957 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1958 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1959 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1960 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1961 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1962 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1965 Version 1.41.1 (2020-02-27)
1966 ===========================
1968 * [Always check types of static items][69145]
1969 * [Always check lifetime bounds of `Copy` impls][69145]
1970 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1972 [69225]: https://github.com/rust-lang/rust/issues/69225
1973 [69145]: https://github.com/rust-lang/rust/pull/69145
1976 Version 1.41.0 (2020-01-30)
1977 ===========================
1982 - [You can now pass type parameters to foreign items when implementing
1983 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1984 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1985 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1986 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1987 - [You can now use any valid identifier in a `format_args` macro.][66847]
1988 Previously identifiers starting with an underscore were not allowed.
1989 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1990 enum variants.][66183] These are still rejected semantically, but
1991 can be seen and parsed by procedural macros and conditional compilation.
1996 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1997 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1998 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1999 - [You can now pass an arguments file passing the `@path` syntax
2000 to rustc.][66172] Note that the format differs somewhat from what is
2001 found in other tooling; please see [the documentation][argfile-docs] for
2003 - [You can now provide `--extern` flag without a path, indicating that it is
2004 available from the search path or specified with an `-L` flag.][64882]
2006 \* Refer to Rust's [platform support page][platform-support-doc] for more
2007 information on Rust's tiered platform support.
2009 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2014 - [The `core::panic` module is now stable.][66771] It was already stable
2016 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2017 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2018 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2023 - [`Result::map_or`]
2024 - [`Result::map_or_else`]
2025 - [`std::rc::Weak::weak_count`]
2026 - [`std::rc::Weak::strong_count`]
2027 - [`std::sync::Weak::weak_count`]
2028 - [`std::sync::Weak::strong_count`]
2033 - [Cargo will now document all the private items for binary crates
2034 by default.][cargo/7593]
2035 - [`cargo-install` will now reinstall the package if it detects that it is out
2036 of date.][cargo/7560]
2037 - [Cargo.lock now uses a more git friendly format that should help to reduce
2038 merge conflicts.][cargo/7579]
2039 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2040 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2041 optimisation level to `2` for debug builds. You can also use
2042 `[profile.<profile>.build-override]` to override build scripts and
2048 - [You can now specify `edition` in documentation code blocks to compile the block
2049 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2050 should be compiled the 2018 edition of Rust.
2051 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2052 current theme with `--check-theme`.][54733]
2053 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2058 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2059 Apple targets.][apple-32bit-drop] This means that the source code is still
2060 available to build, but the targets are no longer being tested and release
2061 binaries for those platforms will no longer be distributed by the Rust project.
2062 Please refer to the linked blog post for more information.
2064 [54733]: https://github.com/rust-lang/rust/pull/54733/
2065 [61351]: https://github.com/rust-lang/rust/pull/61351/
2066 [67255]: https://github.com/rust-lang/rust/pull/67255/
2067 [66661]: https://github.com/rust-lang/rust/pull/66661/
2068 [66771]: https://github.com/rust-lang/rust/pull/66771/
2069 [66847]: https://github.com/rust-lang/rust/pull/66847/
2070 [66238]: https://github.com/rust-lang/rust/pull/66238/
2071 [66277]: https://github.com/rust-lang/rust/pull/66277/
2072 [66325]: https://github.com/rust-lang/rust/pull/66325/
2073 [66172]: https://github.com/rust-lang/rust/pull/66172/
2074 [66183]: https://github.com/rust-lang/rust/pull/66183/
2075 [65879]: https://github.com/rust-lang/rust/pull/65879/
2076 [65013]: https://github.com/rust-lang/rust/pull/65013/
2077 [64882]: https://github.com/rust-lang/rust/pull/64882/
2078 [64325]: https://github.com/rust-lang/rust/pull/64325/
2079 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2080 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2081 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2082 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2083 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2084 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2085 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2086 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2087 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2088 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2089 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2091 Version 1.40.0 (2019-12-19)
2092 ===========================
2096 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2097 `const` contexts.][65188] e.g.
2100 pub struct Point(i32, i32);
2102 const ORIGIN: Point = {
2103 let constructor = Point;
2109 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2110 indicate that there may be variants or fields added in the future.][64639]
2111 For example this requires adding a wild-card branch (`_ => {}`) to any match
2112 statements on a non-exhaustive `enum`. [(RFC 2008)]
2113 - [You can now use function-like procedural macros in `extern` blocks and in
2114 type positions.][63931] e.g. `type Generated = macro!();`
2115 - [Function-like and attribute procedural macros can now emit
2116 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2117 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2118 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2119 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2123 - [Added tier 3 support\* for the
2124 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2125 - [Added tier 3 support for the
2126 `aarch64-unknown-none-softfloat` target.][64589]
2127 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2128 `mips64el-unknown-linux-muslabi64` targets.][65843]
2130 \* Refer to Rust's [platform support page][platform-support-doc] for more
2131 information on Rust's tiered platform support.
2135 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2139 - [`BTreeMap::get_key_value`]
2140 - [`HashMap::get_key_value`]
2141 - [`Option::as_deref_mut`]
2142 - [`Option::as_deref`]
2143 - [`Option::flatten`]
2144 - [`UdpSocket::peer_addr`]
2145 - [`f32::to_be_bytes`]
2146 - [`f32::to_le_bytes`]
2147 - [`f32::to_ne_bytes`]
2148 - [`f64::to_be_bytes`]
2149 - [`f64::to_le_bytes`]
2150 - [`f64::to_ne_bytes`]
2151 - [`f32::from_be_bytes`]
2152 - [`f32::from_le_bytes`]
2153 - [`f32::from_ne_bytes`]
2154 - [`f64::from_be_bytes`]
2155 - [`f64::from_le_bytes`]
2156 - [`f64::from_ne_bytes`]
2163 - [Cargo will now always display warnings, rather than only on
2164 fresh builds.][cargo/7450]
2165 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2166 now produce an error.][cargo/7507] Previously these flags were ignored.
2167 - [You can now publish `dev-dependencies` without including
2168 a `version`.][cargo/7333]
2172 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2173 when running documentation tests with `rustdoc`.][63803]
2177 - [As previously announced, any previous NLL warnings in the 2015 edition are
2178 now hard errors.][64221]
2179 - [The `include!` macro will now warn if it failed to include the
2180 entire file.][64284] The `include!` macro unintentionally only includes the
2181 first _expression_ in a file, and this can be unintuitive. This will become
2182 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2183 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2184 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2185 or `extern` blocks now correctly emits a hard error.
2187 [65294]: https://github.com/rust-lang/rust/pull/65294/
2188 [66103]: https://github.com/rust-lang/rust/pull/66103/
2189 [65843]: https://github.com/rust-lang/rust/pull/65843/
2190 [65188]: https://github.com/rust-lang/rust/pull/65188/
2191 [65092]: https://github.com/rust-lang/rust/pull/65092/
2192 [64589]: https://github.com/rust-lang/rust/pull/64589/
2193 [64639]: https://github.com/rust-lang/rust/pull/64639/
2194 [64221]: https://github.com/rust-lang/rust/pull/64221/
2195 [64284]: https://github.com/rust-lang/rust/pull/64284/
2196 [63931]: https://github.com/rust-lang/rust/pull/63931/
2197 [64035]: https://github.com/rust-lang/rust/pull/64035/
2198 [63674]: https://github.com/rust-lang/rust/pull/63674/
2199 [63803]: https://github.com/rust-lang/rust/pull/63803/
2200 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2201 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2202 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2203 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2204 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2205 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2206 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2207 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2208 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2209 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2210 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2211 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2212 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2213 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2214 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2215 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2216 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2217 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2218 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2219 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2220 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2221 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2222 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2223 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2224 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2225 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2228 Version 1.39.0 (2019-11-07)
2229 ===========================
2233 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2234 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2235 - [You can now use certain attributes on function, closure, and function pointer
2236 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2237 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2238 attributes applied to items. e.g.
2241 #[cfg(windows)] slice: &[u16],
2242 #[cfg(not(windows))] slice: &[u8],
2247 - [You can now take shared references to bind-by-move patterns in the `if` guards
2248 of `match` arms.][63118] e.g.
2251 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2255 // ---- `nums` is bound by move.
2256 if nums.iter().sum::<u8>() == 10
2257 // ^------ `.iter()` implicitly takes a reference to `nums`.
2260 // ----------- Legal as `nums` was bound by move and so we have ownership.
2262 _ => unreachable!(),
2271 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2272 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2273 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2274 **Note** Cargo currently doesn't use this feature. Refer to
2275 [cargo#7315][cargo/7315] to track this feature's progress.
2276 - [You can now pass `--show-output` argument to test binaries to print the
2277 output of successful tests.][62600]
2280 \* Refer to Rust's [platform support page][platform-support-doc] for more
2281 information on Rust's tiered platform support.
2285 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2286 - [`LinkedList::new` is now a `const` function.][63684]
2287 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2288 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2289 now `const`.][63786]
2293 - [`Pin::into_inner`]
2294 - [`Instant::checked_duration_since`]
2295 - [`Instant::saturating_duration_since`]
2299 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2300 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2301 `--all` is now deprecated.
2305 - [You can now pass `-Clinker` to rustdoc to control the linker used
2306 for compiling doctests.][63834]
2310 - [Code that was previously accepted by the old borrow checker, but rejected by
2311 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2312 previously a warning, and will also become a hard error in the Rust 2015
2313 edition in the 1.40.0 release.
2314 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2315 run tests.][63827] This should improve performance when running a large
2317 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2318 recommended to use the `?` operator instead.
2319 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2322 [62600]: https://github.com/rust-lang/rust/pull/62600/
2323 [62672]: https://github.com/rust-lang/rust/pull/62672/
2324 [63118]: https://github.com/rust-lang/rust/pull/63118/
2325 [63209]: https://github.com/rust-lang/rust/pull/63209/
2326 [63402]: https://github.com/rust-lang/rust/pull/63402/
2327 [63565]: https://github.com/rust-lang/rust/pull/63565/
2328 [63595]: https://github.com/rust-lang/rust/pull/63595/
2329 [63684]: https://github.com/rust-lang/rust/pull/63684/
2330 [63698]: https://github.com/rust-lang/rust/pull/63698/
2331 [63770]: https://github.com/rust-lang/rust/pull/63770/
2332 [63786]: https://github.com/rust-lang/rust/pull/63786/
2333 [63827]: https://github.com/rust-lang/rust/pull/63827/
2334 [63834]: https://github.com/rust-lang/rust/pull/63834/
2335 [63927]: https://github.com/rust-lang/rust/pull/63927/
2336 [63933]: https://github.com/rust-lang/rust/pull/63933/
2337 [63934]: https://github.com/rust-lang/rust/pull/63934/
2338 [63938]: https://github.com/rust-lang/rust/pull/63938/
2339 [63940]: https://github.com/rust-lang/rust/pull/63940/
2340 [63941]: https://github.com/rust-lang/rust/pull/63941/
2341 [63945]: https://github.com/rust-lang/rust/pull/63945/
2342 [64010]: https://github.com/rust-lang/rust/pull/64010/
2343 [64028]: https://github.com/rust-lang/rust/pull/64028/
2344 [64334]: https://github.com/rust-lang/rust/pull/64334/
2345 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2346 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2347 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2348 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2349 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2350 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2352 Version 1.38.0 (2019-09-26)
2353 ==========================
2357 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2358 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2362 - [Added pipelined compilation support to `rustc`.][62766] This will
2363 improve compilation times in some cases. For further information please refer
2364 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2365 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2366 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2367 `x86_64-uwp-windows-msvc` targets.][60260]
2368 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2369 `armv7-unknown-linux-musleabi` targets.][63107]
2370 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2371 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2372 - [Upgraded to LLVM 9.][62592]
2374 \* Refer to Rust's [platform support page][platform-support-doc] for more
2375 information on Rust's tiered platform support.
2379 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2380 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2381 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2382 is available at `std::clone::Clone`). This also makes all built-in macros
2383 available in `std`/`core` root. e.g. `std::include_bytes!`.
2384 - [`str::Chars` now implements `Debug`.][63000]
2385 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2386 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2387 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2388 - [Added euclidean remainder and division operations (`div_euclid`,
2389 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2390 `overflowing`, and `wrapping` versions are available for all
2392 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2393 `PartialEq`.][61491]
2394 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2398 - [`<*const T>::cast`]
2399 - [`<*mut T>::cast`]
2400 - [`Duration::as_secs_f32`]
2401 - [`Duration::as_secs_f64`]
2402 - [`Duration::div_f32`]
2403 - [`Duration::div_f64`]
2404 - [`Duration::from_secs_f32`]
2405 - [`Duration::from_secs_f64`]
2406 - [`Duration::mul_f32`]
2407 - [`Duration::mul_f64`]
2408 - [`any::type_name`]
2412 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2413 - [You can now pass the `--features` option multiple times to enable
2414 multiple features.][cargo/7084]
2419 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2423 - [`rustc` will now warn about some incorrect uses of
2424 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2428 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2430 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2431 issues][62896] with certain crates such as libc.
2433 [60260]: https://github.com/rust-lang/rust/pull/60260/
2434 [61457]: https://github.com/rust-lang/rust/pull/61457/
2435 [61491]: https://github.com/rust-lang/rust/pull/61491/
2436 [61884]: https://github.com/rust-lang/rust/pull/61884/
2437 [61953]: https://github.com/rust-lang/rust/pull/61953/
2438 [62042]: https://github.com/rust-lang/rust/pull/62042/
2439 [62528]: https://github.com/rust-lang/rust/pull/62528/
2440 [62583]: https://github.com/rust-lang/rust/pull/62583/
2441 [62735]: https://github.com/rust-lang/rust/pull/62735/
2442 [62766]: https://github.com/rust-lang/rust/pull/62766/
2443 [62784]: https://github.com/rust-lang/rust/pull/62784/
2444 [62592]: https://github.com/rust-lang/rust/pull/62592/
2445 [62785]: https://github.com/rust-lang/rust/issues/62785/
2446 [62814]: https://github.com/rust-lang/rust/pull/62814/
2447 [62896]: https://github.com/rust-lang/rust/issues/62896/
2448 [63000]: https://github.com/rust-lang/rust/pull/63000/
2449 [63056]: https://github.com/rust-lang/rust/pull/63056/
2450 [63107]: https://github.com/rust-lang/rust/pull/63107/
2451 [63346]: https://github.com/rust-lang/rust/pull/63346/
2452 [63421]: https://github.com/rust-lang/rust/pull/63421/
2453 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2454 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2455 [63048]: https://github.com/rust-lang/rust/pull/63048
2456 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2457 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2458 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2459 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2460 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2461 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2462 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2463 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2464 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2465 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2466 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2467 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2468 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2470 Version 1.37.0 (2019-08-15)
2471 ==========================
2475 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2476 [`Box`][62228], or an [array][62235] and unused.
2477 - [You can now use the `cfg` and `cfg_attr` attributes on
2478 generic parameters.][61547]
2479 - [You can now use enum variants through type alias.][61682] e.g. You can
2480 write the following:
2482 type MyOption = Option<u8>;
2484 fn increment_or_zero(x: MyOption) -> u8 {
2486 MyOption::Some(y) => y + 1,
2487 MyOption::None => 0,
2491 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2492 `const _: u32 = 5;`.
2493 - [You can now use `#[repr(align(X)]` on enums.][61229]
2494 - [The `?` Kleene macro operator is now available in the
2495 2015 edition.][60932]
2499 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2500 and `-C profile-use` flags.][61268] For more information on how to use profile
2501 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2502 - [The `rust-lldb` wrapper script should now work again.][61827]
2506 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2510 - [`BufReader::buffer`]
2511 - [`BufWriter::buffer`]
2512 - [`Cell::from_mut`]
2513 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2514 - [`DoubleEndedIterator::nth_back`]
2516 - [`Wrapping::reverse_bits`]
2517 - [`i128::reverse_bits`]
2518 - [`i16::reverse_bits`]
2519 - [`i32::reverse_bits`]
2520 - [`i64::reverse_bits`]
2521 - [`i8::reverse_bits`]
2522 - [`isize::reverse_bits`]
2523 - [`slice::copy_within`]
2524 - [`u128::reverse_bits`]
2525 - [`u16::reverse_bits`]
2526 - [`u32::reverse_bits`]
2527 - [`u64::reverse_bits`]
2528 - [`u8::reverse_bits`]
2529 - [`usize::reverse_bits`]
2533 - [`Cargo.lock` files are now included by default when publishing executable crates
2534 with executables.][cargo/7026]
2535 - [You can now specify `default-run="foo"` in `[package]` to specify the
2536 default executable to use for `cargo run`.][cargo/7056]
2543 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2544 Please transition your code to using the `..=` syntax for inclusive
2546 - [Using a trait object without the `dyn` will now warn by default.][61203]
2547 Please transition your code to use `dyn Trait` for trait objects instead.
2549 [62228]: https://github.com/rust-lang/rust/pull/62228/
2550 [62235]: https://github.com/rust-lang/rust/pull/62235/
2551 [61802]: https://github.com/rust-lang/rust/pull/61802/
2552 [61827]: https://github.com/rust-lang/rust/pull/61827/
2553 [61547]: https://github.com/rust-lang/rust/pull/61547/
2554 [61682]: https://github.com/rust-lang/rust/pull/61682/
2555 [61268]: https://github.com/rust-lang/rust/pull/61268/
2556 [61342]: https://github.com/rust-lang/rust/pull/61342/
2557 [61347]: https://github.com/rust-lang/rust/pull/61347/
2558 [61100]: https://github.com/rust-lang/rust/pull/61100/
2559 [61203]: https://github.com/rust-lang/rust/pull/61203/
2560 [61229]: https://github.com/rust-lang/rust/pull/61229/
2561 [60932]: https://github.com/rust-lang/rust/pull/60932/
2562 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2563 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2564 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2565 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2566 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2567 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2568 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2569 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2570 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2571 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2572 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2573 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2574 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2575 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2576 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2577 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2578 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2579 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2580 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2581 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2582 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2583 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2584 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2585 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2588 Version 1.36.0 (2019-07-04)
2589 ==========================
2593 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2594 - [The order of traits in trait objects no longer affects the semantics of that
2595 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2596 `dyn fmt::Debug + Send`, where this was previously not the case.
2600 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2601 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2602 - [`mem::needs_drop` is now available as a const fn.][60364]
2603 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2604 - [`String` now implements `BorrowMut<str>`.][60404]
2605 - [`io::Cursor` now implements `Default`.][60234]
2606 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2607 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2608 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2609 environment has access to heap memory allocation.
2610 - [`String` now implements `From<&String>`.][59825]
2611 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2612 return a tuple of each argument when there is multiple arguments.
2613 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2618 - [`VecDeque::rotate_left`]
2619 - [`VecDeque::rotate_right`]
2620 - [`Iterator::copied`]
2622 - [`io::IoSliceMut`]
2623 - [`Read::read_vectored`]
2624 - [`Write::write_vectored`]
2625 - [`str::as_mut_ptr`]
2626 - [`mem::MaybeUninit`]
2627 - [`pointer::align_offset`]
2628 - [`future::Future`]
2630 - [`task::RawWaker`]
2631 - [`task::RawWakerVTable`]
2637 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2638 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2640 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2644 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2651 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2652 longer recommended, and will be deprecated in 1.39.0.
2654 [60318]: https://github.com/rust-lang/rust/pull/60318/
2655 [60364]: https://github.com/rust-lang/rust/pull/60364/
2656 [60370]: https://github.com/rust-lang/rust/pull/60370/
2657 [60404]: https://github.com/rust-lang/rust/pull/60404/
2658 [60234]: https://github.com/rust-lang/rust/pull/60234/
2659 [60244]: https://github.com/rust-lang/rust/pull/60244/
2660 [58623]: https://github.com/rust-lang/rust/pull/58623/
2661 [59648]: https://github.com/rust-lang/rust/pull/59648/
2662 [59675]: https://github.com/rust-lang/rust/pull/59675/
2663 [59825]: https://github.com/rust-lang/rust/pull/59825/
2664 [59826]: https://github.com/rust-lang/rust/pull/59826/
2665 [59445]: https://github.com/rust-lang/rust/pull/59445/
2666 [59114]: https://github.com/rust-lang/rust/pull/59114/
2667 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2668 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2669 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2670 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2671 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2672 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2673 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2674 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2675 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2676 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2677 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2678 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2679 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2680 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2681 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2682 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2683 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2684 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2685 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2686 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2689 Version 1.35.0 (2019-05-23)
2690 ==========================
2694 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2695 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2696 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2698 unsafe fn call_unsafe(func: unsafe fn()) {
2703 unsafe { call_unsafe(|| {}); }
2710 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2711 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2712 - [Added the `wasm32-unknown-wasi` target.][59464]
2717 - [`Thread` will now show its ID in `Debug` output.][59460]
2718 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2719 - [`alloc::System` now implements `Default`.][59451]
2720 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2722 - [`char::{ToLowercase, ToUppercase}` now
2723 implement `ExactSizeIterator`.][58778]
2724 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2725 - [Removed the `Read` trait bounds
2726 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2727 - [You can now call the `dbg!` macro without any parameters to print the file
2728 and line where it is called.][57847]
2729 - [In place ASCII case conversions are now up to 4× faster.][59283]
2730 e.g. `str::make_ascii_lowercase`
2731 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2738 - [`RefCell::replace_with`]
2739 - [`RefCell::map_split`]
2741 - [`Range::contains`]
2742 - [`RangeFrom::contains`]
2743 - [`RangeTo::contains`]
2744 - [`RangeInclusive::contains`]
2745 - [`RangeToInclusive::contains`]
2746 - [`Option::copied`]
2750 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2751 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2756 - [The Rust toolchain is now available natively for musl based distros.][58575]
2758 [59460]: https://github.com/rust-lang/rust/pull/59460/
2759 [59464]: https://github.com/rust-lang/rust/pull/59464/
2760 [59500]: https://github.com/rust-lang/rust/pull/59500/
2761 [59512]: https://github.com/rust-lang/rust/pull/59512/
2762 [59580]: https://github.com/rust-lang/rust/pull/59580/
2763 [59283]: https://github.com/rust-lang/rust/pull/59283/
2764 [59451]: https://github.com/rust-lang/rust/pull/59451/
2765 [59076]: https://github.com/rust-lang/rust/pull/59076/
2766 [58778]: https://github.com/rust-lang/rust/pull/58778/
2767 [58717]: https://github.com/rust-lang/rust/pull/58717/
2768 [58369]: https://github.com/rust-lang/rust/pull/58369/
2769 [58423]: https://github.com/rust-lang/rust/pull/58423/
2770 [58080]: https://github.com/rust-lang/rust/pull/58080/
2771 [57847]: https://github.com/rust-lang/rust/pull/57847/
2772 [58575]: https://github.com/rust-lang/rust/pull/58575
2773 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2774 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2775 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2776 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2777 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2778 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2779 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2780 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2781 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2782 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2783 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2784 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2786 Version 1.34.2 (2019-05-14)
2787 ===========================
2789 * [Destabilize the `Error::type_id` function due to a security
2790 vulnerability][60785] ([CVE-2019-12083])
2792 [60785]: https://github.com/rust-lang/rust/pull/60785
2793 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2795 Version 1.34.1 (2019-04-25)
2796 ===========================
2798 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2799 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2800 * [Fix Clippy panic when checking some macros][clippy/3805]
2802 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2803 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2804 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2806 Version 1.34.0 (2019-04-11)
2807 ==========================
2811 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2812 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2814 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2815 `#[attr{}]` procedural macros.][57367]
2816 - [You can now write `extern crate self as foo;`][57407] to import your
2817 crate's root into the extern prelude.
2822 - [You can now target `riscv64imac-unknown-none-elf` and
2823 `riscv64gc-unknown-none-elf`.][58406]
2824 - [You can now enable linker plugin LTO optimisations with
2825 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2826 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2828 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2833 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2834 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2835 the `Hash` trait to create an iterator.
2836 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2837 methods.][58421] Most notably you no longer require the `Ord` trait to create
2839 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2840 for all numeric types.][58044]
2841 - [Indexing a `str` is now generic over all types that
2842 implement `SliceIndex<str>`.][57604]
2843 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2844 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2845 produce a warning if their returning type is unused.
2846 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2847 `overflowing_pow` are now available for all numeric types.][57873] These are
2848 equivalent to methods such as `wrapping_add` for the `pow` operation.
2856 * [`Error::type_id`]
2857 * [`atomic::AtomicI16`]
2858 * [`atomic::AtomicI32`]
2859 * [`atomic::AtomicI64`]
2860 * [`atomic::AtomicI8`]
2861 * [`atomic::AtomicU16`]
2862 * [`atomic::AtomicU32`]
2863 * [`atomic::AtomicU64`]
2864 * [`atomic::AtomicU8`]
2865 * [`convert::Infallible`]
2866 * [`convert::TryFrom`]
2867 * [`convert::TryInto`]
2869 * [`iter::successors`]
2870 * [`num::NonZeroI128`]
2871 * [`num::NonZeroI16`]
2872 * [`num::NonZeroI32`]
2873 * [`num::NonZeroI64`]
2874 * [`num::NonZeroI8`]
2875 * [`num::NonZeroIsize`]
2876 * [`slice::sort_by_cached_key`]
2877 * [`str::escape_debug`]
2878 * [`str::escape_default`]
2879 * [`str::escape_unicode`]
2880 * [`str::split_ascii_whitespace`]
2883 * [`Instant::checked_add`]
2884 * [`Instant::checked_sub`]
2885 * [`SystemTime::checked_add`]
2886 * [`SystemTime::checked_sub`]
2890 - [You can now use alternative registries to crates.io.][cargo/6654]
2894 - [You can now use the `?` operator in your documentation tests without manually
2895 adding `fn main() -> Result<(), _> {}`.][56470]
2899 - [`Command::before_exec` is being replaced by the unsafe method
2900 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2901 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2902 can now use `const` functions in `static` variables.
2904 [58370]: https://github.com/rust-lang/rust/pull/58370/
2905 [58406]: https://github.com/rust-lang/rust/pull/58406/
2906 [58421]: https://github.com/rust-lang/rust/pull/58421/
2907 [58166]: https://github.com/rust-lang/rust/pull/58166/
2908 [58044]: https://github.com/rust-lang/rust/pull/58044/
2909 [58057]: https://github.com/rust-lang/rust/pull/58057/
2910 [58059]: https://github.com/rust-lang/rust/pull/58059/
2911 [57809]: https://github.com/rust-lang/rust/pull/57809/
2912 [57873]: https://github.com/rust-lang/rust/pull/57873/
2913 [57604]: https://github.com/rust-lang/rust/pull/57604/
2914 [57367]: https://github.com/rust-lang/rust/pull/57367/
2915 [57407]: https://github.com/rust-lang/rust/pull/57407/
2916 [57425]: https://github.com/rust-lang/rust/pull/57425/
2917 [57106]: https://github.com/rust-lang/rust/pull/57106/
2918 [56470]: https://github.com/rust-lang/rust/pull/56470/
2919 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2920 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2921 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2922 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2923 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2924 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2925 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2926 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2927 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2928 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2929 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2930 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2931 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2932 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2933 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2934 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2935 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2936 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2937 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2938 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2939 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2940 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2941 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2942 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2943 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2944 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2945 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2946 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2947 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2948 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2949 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2952 Version 1.33.0 (2019-02-28)
2953 ==========================
2957 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2958 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2959 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2960 E.g. You can have match statement on a `u8` that covers `0..=255` and
2961 you would no longer be required to have a `_ => unreachable!()` case.
2962 - [You can now have multiple patterns in `if let` and `while let`
2963 expressions.][57532] You can do this with the same syntax as a `match`
2973 let state = Creature::Crab("Ferris");
2975 if let Creature::Crab(name) | Creature::Person(name) = state {
2976 println!("This creature's name is: {}", name);
2980 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2981 this feature will by default produce a warning as this behaviour can be
2982 unintuitive. E.g. `if let _ = 5 {}`
2983 - [You can now use `let` bindings, assignments, expression statements,
2984 and irrefutable pattern destructuring in const functions.][57175]
2985 - [You can now call unsafe const functions.][57067] E.g.
2987 const unsafe fn foo() -> i32 { 5 }
2988 const fn bar() -> i32 {
2992 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2993 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2994 - [You can now specify a specific alignment with the `#[repr(packed)]`
2995 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2996 with an alignment of 2 bytes and a size of 6 bytes.
2997 - [You can now import an item from a module as an `_`.][56303] This allows you to
2998 import a trait's impls, and not have the name in the namespace. E.g.
3000 use std::io::Read as _;
3002 // Allowed as there is only one `Read` in the module.
3005 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3009 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3010 command line argument.][56351]
3011 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3012 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3013 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3014 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3015 information on Rust's platform support.
3016 - [Added support for the `thumbv7neon-linux-androideabi` and
3017 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3018 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3022 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3023 functions for all numeric types.][57566]
3024 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3025 are now `const` functions for all numeric types.][57105]
3026 - [The methods `is_positive` and `is_negative` are now `const` functions for
3027 all signed numeric types.][57105]
3028 - [The `get` method for all `NonZero` types is now `const`.][57167]
3029 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3030 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3031 numeric types.][57234]
3032 - [`Ipv4Addr::new` is now a `const` function][57234]
3036 - [`unix::FileExt::read_exact_at`]
3037 - [`unix::FileExt::write_all_at`]
3038 - [`Option::transpose`]
3039 - [`Result::transpose`]
3040 - [`convert::identity`]
3043 - [`marker::PhantomPinned`]
3044 - [`Vec::resize_with`]
3045 - [`VecDeque::resize_with`]
3046 - [`Duration::as_millis`]
3047 - [`Duration::as_micros`]
3048 - [`Duration::as_nanos`]
3053 - [You can now publish crates that require a feature flag to compile with
3054 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3055 - [Cargo should now rebuild a crate if a file was modified during the initial
3060 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3061 are now deprecated in the standard library, and their usage will now produce a warning.
3062 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3064 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3066 - [Libtest no longer creates a new thread for each test when
3067 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3069 [55982]: https://github.com/rust-lang/rust/pull/55982/
3070 [56243]: https://github.com/rust-lang/rust/pull/56243
3071 [56303]: https://github.com/rust-lang/rust/pull/56303/
3072 [56351]: https://github.com/rust-lang/rust/pull/56351/
3073 [56362]: https://github.com/rust-lang/rust/pull/56362
3074 [56642]: https://github.com/rust-lang/rust/pull/56642/
3075 [56769]: https://github.com/rust-lang/rust/pull/56769/
3076 [56805]: https://github.com/rust-lang/rust/pull/56805
3077 [56947]: https://github.com/rust-lang/rust/pull/56947/
3078 [57049]: https://github.com/rust-lang/rust/pull/57049/
3079 [57067]: https://github.com/rust-lang/rust/pull/57067/
3080 [57105]: https://github.com/rust-lang/rust/pull/57105
3081 [57130]: https://github.com/rust-lang/rust/pull/57130/
3082 [57167]: https://github.com/rust-lang/rust/pull/57167/
3083 [57175]: https://github.com/rust-lang/rust/pull/57175/
3084 [57234]: https://github.com/rust-lang/rust/pull/57234/
3085 [57332]: https://github.com/rust-lang/rust/pull/57332/
3086 [57465]: https://github.com/rust-lang/rust/pull/57465/
3087 [57532]: https://github.com/rust-lang/rust/pull/57532/
3088 [57535]: https://github.com/rust-lang/rust/pull/57535/
3089 [57566]: https://github.com/rust-lang/rust/pull/57566/
3090 [57615]: https://github.com/rust-lang/rust/pull/57615/
3091 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3092 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3093 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3094 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3095 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3096 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3097 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3098 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3099 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3100 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3101 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3102 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3103 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3104 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3105 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3106 [platform-support]: https://forge.rust-lang.org/platform-support.html
3108 Version 1.32.0 (2019-01-17)
3109 ==========================
3114 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3115 operator allows you to specify zero or one repetitions similar to the `*` and
3117 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3118 now always resolve to the item (`enum`, `struct`, etc.) available in the
3119 module if present, before resolving to a external crate or an item the prelude.][56759]
3122 enum Color { Red, Green, Blue }
3128 - [You can now match against `PhantomData<T>` types.][55837]
3129 - [You can now match against literals in macros with the `literal`
3130 specifier.][56072] This will match against a literal of any type.
3131 E.g. `1`, `'A'`, `"Hello World"`
3132 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3134 struct Point(i32, i32);
3137 pub fn new(x: i32, y: i32) -> Self {
3141 pub fn is_origin(&self) -> bool {
3149 - [Self can also now be used in type definitions.][56366] E.g.
3153 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3156 Cons(T, Box<Self>) // likewise here
3159 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3160 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3164 - [The default allocator has changed from jemalloc to the default allocator on
3165 your system.][55238] The compiler itself on Linux & macOS will still use
3166 jemalloc, but programs compiled with it will use the system allocator.
3167 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3171 - [`PathBuf` now implements `FromStr`.][55148]
3172 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3173 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3174 easily debug expressions in your rust program. E.g.
3177 let b = dbg!(a * 2) + 1;
3178 // ^-- prints: [src/main.rs:4] a * 2 = 4
3182 The following APIs are now `const` functions and can be used in a
3186 - [`UnsafeCell::get`]
3187 - [`char::is_ascii`]
3189 - [`ManuallyDrop::new`]
3190 - [`ManuallyDrop::into_inner`]
3191 - [`RangeInclusive::start`]
3192 - [`RangeInclusive::end`]
3193 - [`NonNull::as_ptr`]
3196 - [`Duration::as_secs`]
3197 - [`Duration::subsec_millis`]
3198 - [`Duration::subsec_micros`]
3199 - [`Duration::subsec_nanos`]
3201 - [`Ipv4Addr::is_unspecified`]
3203 - [`Ipv6Addr::octets`]
3207 - [`i8::to_be_bytes`]
3208 - [`i8::to_le_bytes`]
3209 - [`i8::to_ne_bytes`]
3210 - [`i8::from_be_bytes`]
3211 - [`i8::from_le_bytes`]
3212 - [`i8::from_ne_bytes`]
3213 - [`i16::to_be_bytes`]
3214 - [`i16::to_le_bytes`]
3215 - [`i16::to_ne_bytes`]
3216 - [`i16::from_be_bytes`]
3217 - [`i16::from_le_bytes`]
3218 - [`i16::from_ne_bytes`]
3219 - [`i32::to_be_bytes`]
3220 - [`i32::to_le_bytes`]
3221 - [`i32::to_ne_bytes`]
3222 - [`i32::from_be_bytes`]
3223 - [`i32::from_le_bytes`]
3224 - [`i32::from_ne_bytes`]
3225 - [`i64::to_be_bytes`]
3226 - [`i64::to_le_bytes`]
3227 - [`i64::to_ne_bytes`]
3228 - [`i64::from_be_bytes`]
3229 - [`i64::from_le_bytes`]
3230 - [`i64::from_ne_bytes`]
3231 - [`i128::to_be_bytes`]
3232 - [`i128::to_le_bytes`]
3233 - [`i128::to_ne_bytes`]
3234 - [`i128::from_be_bytes`]
3235 - [`i128::from_le_bytes`]
3236 - [`i128::from_ne_bytes`]
3237 - [`isize::to_be_bytes`]
3238 - [`isize::to_le_bytes`]
3239 - [`isize::to_ne_bytes`]
3240 - [`isize::from_be_bytes`]
3241 - [`isize::from_le_bytes`]
3242 - [`isize::from_ne_bytes`]
3243 - [`u8::to_be_bytes`]
3244 - [`u8::to_le_bytes`]
3245 - [`u8::to_ne_bytes`]
3246 - [`u8::from_be_bytes`]
3247 - [`u8::from_le_bytes`]
3248 - [`u8::from_ne_bytes`]
3249 - [`u16::to_be_bytes`]
3250 - [`u16::to_le_bytes`]
3251 - [`u16::to_ne_bytes`]
3252 - [`u16::from_be_bytes`]
3253 - [`u16::from_le_bytes`]
3254 - [`u16::from_ne_bytes`]
3255 - [`u32::to_be_bytes`]
3256 - [`u32::to_le_bytes`]
3257 - [`u32::to_ne_bytes`]
3258 - [`u32::from_be_bytes`]
3259 - [`u32::from_le_bytes`]
3260 - [`u32::from_ne_bytes`]
3261 - [`u64::to_be_bytes`]
3262 - [`u64::to_le_bytes`]
3263 - [`u64::to_ne_bytes`]
3264 - [`u64::from_be_bytes`]
3265 - [`u64::from_le_bytes`]
3266 - [`u64::from_ne_bytes`]
3267 - [`u128::to_be_bytes`]
3268 - [`u128::to_le_bytes`]
3269 - [`u128::to_ne_bytes`]
3270 - [`u128::from_be_bytes`]
3271 - [`u128::from_le_bytes`]
3272 - [`u128::from_ne_bytes`]
3273 - [`usize::to_be_bytes`]
3274 - [`usize::to_le_bytes`]
3275 - [`usize::to_ne_bytes`]
3276 - [`usize::from_be_bytes`]
3277 - [`usize::from_le_bytes`]
3278 - [`usize::from_ne_bytes`]
3282 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3283 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3287 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3291 - [The argument types for AVX's
3292 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3293 been changed from `*const` to `*mut` as the previous implementation
3297 [55148]: https://github.com/rust-lang/rust/pull/55148/
3298 [55238]: https://github.com/rust-lang/rust/pull/55238/
3299 [55280]: https://github.com/rust-lang/rust/pull/55280/
3300 [55610]: https://github.com/rust-lang/rust/pull/55610/
3301 [55663]: https://github.com/rust-lang/rust/pull/55663/
3302 [55702]: https://github.com/rust-lang/rust/pull/55702/
3303 [55837]: https://github.com/rust-lang/rust/pull/55837/
3304 [55843]: https://github.com/rust-lang/rust/pull/55843/
3305 [56072]: https://github.com/rust-lang/rust/pull/56072/
3306 [56245]: https://github.com/rust-lang/rust/pull/56245/
3307 [56365]: https://github.com/rust-lang/rust/pull/56365/
3308 [56366]: https://github.com/rust-lang/rust/pull/56366/
3309 [56395]: https://github.com/rust-lang/rust/pull/56395/
3310 [56759]: https://github.com/rust-lang/rust/pull/56759/
3311 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3312 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3313 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3314 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3315 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3316 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3317 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3318 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3319 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3320 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3321 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3322 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3323 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3324 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3325 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3326 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3327 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3328 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3329 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3330 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3331 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3332 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3333 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3334 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3335 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3336 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3337 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3338 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3339 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3340 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3341 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3342 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3343 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3344 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3345 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3346 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3347 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3348 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3349 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3350 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3351 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3352 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3353 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3354 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3355 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3356 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3357 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3358 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3359 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3360 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3361 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3362 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3363 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3364 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3365 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3366 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3367 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3368 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3369 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3370 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3371 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3372 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3373 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3374 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3375 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3376 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3377 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3378 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3379 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3380 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3381 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3382 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3383 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3384 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3385 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3386 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3387 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3388 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3389 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3390 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3391 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3392 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3393 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3394 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3395 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3396 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3397 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3398 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3399 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3400 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3401 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3402 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3403 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3406 Version 1.31.1 (2018-12-20)
3407 ===========================
3409 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3410 - [Fix broken go-to-definition in RLS][rls/1171]
3411 - [Fix infinite loop on hover in RLS][rls/1170]
3413 [56562]: https://github.com/rust-lang/rust/pull/56562
3414 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3415 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3417 Version 1.31.0 (2018-12-06)
3418 ==========================
3422 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3423 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3424 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3425 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3427 - [You can now define and use `const` functions.][54835] These are currently
3428 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3429 [language reference][const-reference] for what exactly is available.
3430 - [You can now use tool lints, which allow you to scope lints from external
3431 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3432 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3433 a crate, not just in exported functions.][54451]
3434 - [You can now use parentheses in pattern matches.][54497]
3438 - [Updated musl to 1.1.20][54430]
3442 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3443 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3444 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3445 into `Option<&mut T>` using the `From` trait.][53218]
3446 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3451 - [`slice::align_to`]
3452 - [`slice::align_to_mut`]
3453 - [`slice::chunks_exact`]
3454 - [`slice::chunks_exact_mut`]
3455 - [`slice::rchunks`]
3456 - [`slice::rchunks_mut`]
3457 - [`slice::rchunks_exact`]
3458 - [`slice::rchunks_exact_mut`]
3459 - [`Option::replace`]
3463 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3464 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3465 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3467 [52813]: https://github.com/rust-lang/rust/pull/52813/
3468 [53218]: https://github.com/rust-lang/rust/pull/53218/
3469 [53555]: https://github.com/rust-lang/rust/issues/53555/
3470 [54057]: https://github.com/rust-lang/rust/pull/54057/
3471 [54240]: https://github.com/rust-lang/rust/pull/54240/
3472 [54430]: https://github.com/rust-lang/rust/pull/54430/
3473 [54451]: https://github.com/rust-lang/rust/pull/54451/
3474 [54497]: https://github.com/rust-lang/rust/pull/54497/
3475 [54778]: https://github.com/rust-lang/rust/pull/54778/
3476 [54835]: https://github.com/rust-lang/rust/pull/54835/
3477 [54870]: https://github.com/rust-lang/rust/pull/54870/
3478 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3479 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3480 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3481 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3482 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3483 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3484 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3485 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3486 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3487 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3488 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3489 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3490 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3491 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3493 Version 1.30.1 (2018-11-08)
3494 ===========================
3496 - [Fixed overflow ICE in rustdoc][54199]
3497 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3499 [54199]: https://github.com/rust-lang/rust/pull/54199
3500 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3502 Version 1.30.0 (2018-10-25)
3503 ==========================
3507 - [Procedural macros are now available.][52081] These kinds of macros allow for
3508 more powerful code generation. There is a [new chapter available][proc-macros]
3509 in the Rust Programming Language book that goes further in depth.
3510 - [You can now use keywords as identifiers using the raw identifiers
3511 syntax (`r#`),][53236] e.g. `let r#for = true;`
3512 - [Using anonymous parameters in traits is now deprecated with a warning and
3513 will be a hard error in the 2018 edition.][53272]
3514 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3515 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3516 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3517 Previously, using a external crate in a module without a use statement
3518 required `let json = ::serde_json::from_str(foo);` but can now be written
3519 as `let json = serde_json::from_str(foo);`.
3520 - [You can now apply the `#[used]` attribute to static items to prevent the
3521 compiler from optimising them away, even if they appear to be unused,][51363]
3522 e.g. `#[used] static FOO: u32 = 1;`
3523 - [You can now import and reexport macros from other crates with the `use`
3524 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3525 the root module of the crate. If your macro relies on calling other local
3526 macros, it is recommended to export with the
3527 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3529 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3530 using the `vis` specifier.][53370]
3531 - [Non-macro attributes now allow all forms of literals, not just
3532 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3533 write `#[attr(true)]`.
3534 - [You can now specify a function to handle a panic in the Rust runtime with the
3535 `#[panic_handler]` attribute.][51366]
3539 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3540 - [Added the `aarch64-unknown-netbsd` target][53165]
3541 - [Upgraded to LLVM 8.][53611]
3545 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3549 - [`Ipv4Addr::BROADCAST`]
3550 - [`Ipv4Addr::LOCALHOST`]
3551 - [`Ipv4Addr::UNSPECIFIED`]
3552 - [`Ipv6Addr::LOCALHOST`]
3553 - [`Ipv6Addr::UNSPECIFIED`]
3554 - [`Iterator::find_map`]
3556 The following methods are replacement methods for `trim_left`, `trim_right`,
3557 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3559 - [`str::trim_end_matches`]
3561 - [`str::trim_start_matches`]
3562 - [`str::trim_start`]
3566 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3567 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3568 equivalent to calling `rustdoc --error-format=json`.
3569 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3573 - [`rustdoc` allows you to specify what edition to treat your code as with the
3574 `--edition` option.][54057]
3575 - [`rustdoc` now has the `--color` (specify whether to output color) and
3576 `--error-format` (specify error format, e.g. `json`) options.][53003]
3577 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3578 debug symbols.][53774]
3579 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3580 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3582 [50911]: https://github.com/rust-lang/rust/pull/50911/
3583 [51363]: https://github.com/rust-lang/rust/pull/51363/
3584 [51366]: https://github.com/rust-lang/rust/pull/51366/
3585 [52081]: https://github.com/rust-lang/rust/pull/52081/
3586 [53003]: https://github.com/rust-lang/rust/pull/53003/
3587 [53033]: https://github.com/rust-lang/rust/pull/53033/
3588 [53044]: https://github.com/rust-lang/rust/pull/53044/
3589 [53165]: https://github.com/rust-lang/rust/pull/53165/
3590 [53611]: https://github.com/rust-lang/rust/pull/53611/
3591 [53213]: https://github.com/rust-lang/rust/pull/53213/
3592 [53236]: https://github.com/rust-lang/rust/pull/53236/
3593 [53272]: https://github.com/rust-lang/rust/pull/53272/
3594 [53370]: https://github.com/rust-lang/rust/pull/53370/
3595 [53459]: https://github.com/rust-lang/rust/pull/53459/
3596 [53774]: https://github.com/rust-lang/rust/pull/53774/
3597 [53822]: https://github.com/rust-lang/rust/pull/53822/
3598 [54057]: https://github.com/rust-lang/rust/pull/54057/
3599 [54146]: https://github.com/rust-lang/rust/pull/54146/
3600 [54404]: https://github.com/rust-lang/rust/pull/54404/
3601 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3602 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3603 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3604 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3606 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3607 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3608 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3609 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3610 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3611 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3612 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3613 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3614 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3615 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3618 Version 1.29.2 (2018-10-11)
3619 ===========================
3621 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3622 - The `rls-preview` component on the windows-gnu targets has been restored.
3624 [54639]: https://github.com/rust-lang/rust/pull/54639
3627 Version 1.29.1 (2018-09-25)
3628 ===========================
3633 - The standard library's `str::repeat` function contained an out of bounds write
3634 caused by an integer overflow. This has been fixed by deterministically
3635 panicking when an overflow happens.
3637 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3641 Version 1.29.0 (2018-09-13)
3642 ==========================
3646 - [Bumped minimum LLVM version to 5.0.][51899]
3647 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3648 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3649 - [Upgraded to LLVM 7.][51966]
3653 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3654 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3655 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3656 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3658 - [`Cell<T>` now allows `T` to be unsized.][50494]
3659 - [`SocketAddr` is now stable on Redox.][52656]
3664 - [`Iterator::flatten`]
3669 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3670 `--locked` to disable this behavior.
3671 - [`cargo-install` will now allow you to cross compile an install
3672 using `--target`.][cargo/5614]
3673 - [Added the `cargo-fix` subcommand to automatically move project code from
3674 2015 edition to 2018.][cargo/5723]
3675 - [`cargo doc` can now optionally document private types using the
3676 `--document-private-items` flag.][cargo/5543]
3680 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3681 the specified level to that level.][52354] For example `--cap-lints warn`
3682 will demote `deny` and `forbid` lints to `warn`.
3683 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3684 fails and `101` if there is a panic.][52197]
3685 - [A preview of clippy has been made available through rustup.][51122]
3686 You can install the preview with `rustup component add clippy-preview`.
3690 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3691 Use `str::get_unchecked(begin..end)` instead.
3692 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3693 Consider using the `home_dir` function from
3694 https://crates.io/crates/dirs instead.
3695 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3696 - [`cfg` attributes and `--cfg` command line flags are now more
3697 strictly validated.][53893]
3699 [53893]: https://github.com/rust-lang/rust/pull/53893/
3700 [52861]: https://github.com/rust-lang/rust/pull/52861/
3701 [51966]: https://github.com/rust-lang/rust/pull/51966/
3702 [52656]: https://github.com/rust-lang/rust/pull/52656/
3703 [52239]: https://github.com/rust-lang/rust/pull/52239/
3704 [52330]: https://github.com/rust-lang/rust/pull/52330/
3705 [52354]: https://github.com/rust-lang/rust/pull/52354/
3706 [52402]: https://github.com/rust-lang/rust/pull/52402/
3707 [52103]: https://github.com/rust-lang/rust/pull/52103/
3708 [52197]: https://github.com/rust-lang/rust/pull/52197/
3709 [51807]: https://github.com/rust-lang/rust/pull/51807/
3710 [51899]: https://github.com/rust-lang/rust/pull/51899/
3711 [51912]: https://github.com/rust-lang/rust/pull/51912/
3712 [51511]: https://github.com/rust-lang/rust/pull/51511/
3713 [51619]: https://github.com/rust-lang/rust/pull/51619/
3714 [51656]: https://github.com/rust-lang/rust/pull/51656/
3715 [51178]: https://github.com/rust-lang/rust/pull/51178/
3716 [51122]: https://github.com/rust-lang/rust/pull/51122
3717 [50494]: https://github.com/rust-lang/rust/pull/50494/
3718 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3719 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3720 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3721 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3722 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3723 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3724 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3727 Version 1.28.0 (2018-08-02)
3728 ===========================
3732 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3733 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3734 the inner type across Foreign Function Interface (FFI) boundaries.
3735 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3736 and can now be used as identifiers.][51196]
3737 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3738 stable.][51241] This will allow users to specify a global allocator for
3740 - [Unit test functions marked with the `#[test]` attribute can now return
3741 `Result<(), E: Debug>` in addition to `()`.][51298]
3742 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3743 allows macros to easily target lifetimes.
3747 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3748 prioritise making smaller binary sizes. `z` is the same as `s` with the
3749 exception that it does not vectorise loops, which typically results in an even
3751 - [The short error format is now stable.][49546] Specified with
3752 `--error-format=short` this option will provide a more compressed output of
3753 rust error messages.
3754 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3755 - [Reduced the number of allocations in the macro parser.][50855] This can
3756 improve compile times of macro heavy crates on average by 5%.
3760 - [Implemented `Default` for `&mut str`.][51306]
3761 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3762 - [Implemented `Extend` for `()`.][50234]
3763 - [The `Debug` implementation of `time::Duration` should now be more easily
3764 human readable.][50364] Previously a `Duration` of one second would printed as
3765 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3766 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3767 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3768 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3769 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3770 for `PathBuf`.][50170]
3771 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3772 and `Wrapping<i128>`.][50465]
3773 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3774 possible.][51050] This can provide up to a 40% speed increase.
3775 - [Improved error messages when using `format!`.][50610]
3779 - [`Iterator::step_by`]
3780 - [`Path::ancestors`]
3781 - [`SystemTime::UNIX_EPOCH`]
3782 - [`alloc::GlobalAlloc`]
3784 - [`alloc::LayoutErr`]
3787 - [`alloc::alloc_zeroed`]
3788 - [`alloc::dealloc`]
3789 - [`alloc::realloc`]
3790 - [`alloc::handle_alloc_error`]
3791 - [`btree_map::Entry::or_default`]
3792 - [`fmt::Alignment`]
3793 - [`hash_map::Entry::or_default`]
3794 - [`iter::repeat_with`]
3795 - [`num::NonZeroUsize`]
3796 - [`num::NonZeroU128`]
3797 - [`num::NonZeroU16`]
3798 - [`num::NonZeroU32`]
3799 - [`num::NonZeroU64`]
3800 - [`num::NonZeroU8`]
3801 - [`ops::RangeBounds`]
3802 - [`slice::SliceIndex`]
3803 - [`slice::from_mut`]
3804 - [`slice::from_ref`]
3805 - [`{Any + Send + Sync}::downcast_mut`]
3806 - [`{Any + Send + Sync}::downcast_ref`]
3807 - [`{Any + Send + Sync}::is`]
3811 - [Cargo will now no longer allow you to publish crates with build scripts that
3812 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3813 considered to be immutable.
3817 - [The `suggestion_applicability` field in `rustc`'s json output is now
3818 stable.][50486] This will allow dev tools to check whether a code suggestion
3819 would apply to them.
3823 - [Rust will consider trait objects with duplicated constraints to be the same
3824 type as without the duplicated constraint.][51276] For example the below code will
3825 now fail to compile.
3830 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3833 impl Trait + Send + Send {
3834 fn test(&self) { println!("two"); }
3838 [49546]: https://github.com/rust-lang/rust/pull/49546/
3839 [50143]: https://github.com/rust-lang/rust/pull/50143/
3840 [50170]: https://github.com/rust-lang/rust/pull/50170/
3841 [50234]: https://github.com/rust-lang/rust/pull/50234/
3842 [50265]: https://github.com/rust-lang/rust/pull/50265/
3843 [50364]: https://github.com/rust-lang/rust/pull/50364/
3844 [50385]: https://github.com/rust-lang/rust/pull/50385/
3845 [50465]: https://github.com/rust-lang/rust/pull/50465/
3846 [50486]: https://github.com/rust-lang/rust/pull/50486/
3847 [50554]: https://github.com/rust-lang/rust/pull/50554/
3848 [50610]: https://github.com/rust-lang/rust/pull/50610/
3849 [50855]: https://github.com/rust-lang/rust/pull/50855/
3850 [51050]: https://github.com/rust-lang/rust/pull/51050/
3851 [51196]: https://github.com/rust-lang/rust/pull/51196/
3852 [51200]: https://github.com/rust-lang/rust/pull/51200/
3853 [51241]: https://github.com/rust-lang/rust/pull/51241/
3854 [51276]: https://github.com/rust-lang/rust/pull/51276/
3855 [51298]: https://github.com/rust-lang/rust/pull/51298/
3856 [51306]: https://github.com/rust-lang/rust/pull/51306/
3857 [51562]: https://github.com/rust-lang/rust/pull/51562/
3858 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3859 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3860 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3861 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3862 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3863 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3864 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3865 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3866 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3867 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3868 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3869 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3870 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3871 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3872 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3873 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3874 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3875 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3876 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3877 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3878 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3879 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3880 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3881 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3882 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3883 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3884 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3885 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3886 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3887 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3889 Version 1.27.2 (2018-07-20)
3890 ===========================
3895 - The borrow checker was fixed to avoid potential unsoundness when using
3896 match ergonomics: [#52213][52213].
3898 [52213]: https://github.com/rust-lang/rust/issues/52213
3900 Version 1.27.1 (2018-07-10)
3901 ===========================
3906 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3907 when running, which enabled executing code as some other user on a
3908 given machine. This release fixes that vulnerability; you can read
3909 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3911 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3916 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3917 match ergonomics: [#51415][51415], [#49534][49534].
3919 [51415]: https://github.com/rust-lang/rust/issues/51415
3920 [49534]: https://github.com/rust-lang/rust/issues/49534
3921 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3922 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3924 Version 1.27.0 (2018-06-21)
3925 ==========================
3929 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3930 be used as an identifier.
3931 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3932 bare `Trait` syntax, and should make it clearer when being used in tandem with
3933 `impl Trait` because it is equivalent to the following syntax:
3934 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3935 `Box<Trait> == Box<dyn Trait>`.
3936 - [Attributes on generic parameters such as types and lifetimes are
3937 now stable.][48851] e.g.
3938 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3939 - [The `#[must_use]` attribute can now also be used on functions as well as
3940 types.][48925] It provides a lint that by default warns users when the
3941 value returned by a function has not been used.
3945 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3949 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3950 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3951 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3952 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3953 the `cfg` attribute.
3954 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3955 std are now available in core.][49896]
3956 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3958 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3959 that the operation isn't done in place.
3960 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3961 the `#[must_use]` attribute][49533] to warn about unused potentially
3962 expensive allocations.
3966 - [`DoubleEndedIterator::rfind`]
3967 - [`DoubleEndedIterator::rfold`]
3968 - [`DoubleEndedIterator::try_rfold`]
3969 - [`Duration::from_micros`]
3970 - [`Duration::from_nanos`]
3971 - [`Duration::subsec_micros`]
3972 - [`Duration::subsec_millis`]
3973 - [`HashMap::remove_entry`]
3974 - [`Iterator::try_fold`]
3975 - [`Iterator::try_for_each`]
3977 - [`Option::filter`]
3978 - [`String::replace_range`]
3979 - [`Take::set_limit`]
3980 - [`hint::unreachable_unchecked`]
3981 - [`os::unix::process::parent_id`]
3982 - [`ptr::swap_nonoverlapping`]
3983 - [`slice::rsplit_mut`]
3985 - [`slice::swap_with_slice`]
3989 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3990 `readme`, and `repository` fields.][cargo/5386]
3991 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3992 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3993 a different directory than `target` for placing compilation artifacts.
3994 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3995 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3996 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3997 where cargo would infer a binary, Cargo will produce a warning. You can
3998 disable this feature ahead of time by setting any of the following to false:
3999 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4000 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4001 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4005 - [Added “The Rustc book” into the official documentation.][49707]
4006 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4007 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4011 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4012 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4013 compile, `"".is_empty()` will still compile.
4014 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4015 will only print the inner type.][48553] E.g.
4016 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4017 not `AtomicBool(true)`.
4018 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4019 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4020 alignment should cover all use cases.
4021 - The `.description()` method on the `std::error::Error` trait
4022 [has been soft-deprecated][50163]. It is no longer required to implement it.
4024 [48553]: https://github.com/rust-lang/rust/pull/48553/
4025 [48851]: https://github.com/rust-lang/rust/pull/48851/
4026 [48925]: https://github.com/rust-lang/rust/pull/48925/
4027 [49533]: https://github.com/rust-lang/rust/pull/49533/
4028 [49623]: https://github.com/rust-lang/rust/pull/49623/
4029 [49630]: https://github.com/rust-lang/rust/pull/49630/
4030 [49664]: https://github.com/rust-lang/rust/pull/49664/
4031 [49699]: https://github.com/rust-lang/rust/pull/49699/
4032 [49707]: https://github.com/rust-lang/rust/pull/49707/
4033 [49719]: https://github.com/rust-lang/rust/pull/49719/
4034 [49896]: https://github.com/rust-lang/rust/pull/49896/
4035 [49968]: https://github.com/rust-lang/rust/pull/49968/
4036 [50163]: https://github.com/rust-lang/rust/pull/50163
4037 [50177]: https://github.com/rust-lang/rust/pull/50177/
4038 [50378]: https://github.com/rust-lang/rust/pull/50378/
4039 [50398]: https://github.com/rust-lang/rust/pull/50398/
4040 [50423]: https://github.com/rust-lang/rust/pull/50423/
4041 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4042 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4043 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4044 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4045 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4046 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4047 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4048 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4049 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4050 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4051 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4052 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4053 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4054 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4055 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4056 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4057 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4058 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4059 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4060 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4061 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4062 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4063 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4064 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4065 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4066 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4067 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4068 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4069 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4070 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4073 Version 1.26.2 (2018-06-05)
4074 ==========================
4079 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4081 [51117]: https://github.com/rust-lang/rust/issues/51117
4084 Version 1.26.1 (2018-05-29)
4085 ==========================
4090 - [RLS now works on Windows.][50646]
4091 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4097 - [`fn main() -> impl Trait` no longer works for non-Termination
4099 This reverts an accidental stabilization.
4100 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4101 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4103 [50646]: https://github.com/rust-lang/rust/issues/50646
4104 [50656]: https://github.com/rust-lang/rust/pull/50656
4105 [50812]: https://github.com/rust-lang/rust/pull/50812
4106 [50950]: https://github.com/rust-lang/rust/issues/50950
4107 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4109 Version 1.26.0 (2018-05-10)
4110 ==========================
4114 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4115 implement either or both traits.][49299]
4116 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4117 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4118 lifetime can be elided.][49458]
4119 - [`impl Trait` is now stable allowing you to have abstract types in returns
4120 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4121 `fn open(path: impl AsRef<Path>)`.
4122 - [Pattern matching will now automatically apply dereferences.][49394]
4123 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4124 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4125 - [A lot of operations are now available in a const context.][46882] E.g. You
4126 can now index into constant arrays, reference and dereference into constants,
4127 and use tuple struct constructors.
4128 - [Fixed entry slice patterns are now stable.][48516] E.g.
4130 let points = [1, 2, 3, 4];
4132 [1, 2, 3, 4] => println!("All points were sequential."),
4133 _ => println!("Not all points were sequential."),
4140 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4141 - [Fixed exponential projection complexity on nested types.][48296]
4142 This can provide up to a ~12% reduction in compile times for certain crates.
4143 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4144 to remap path prefixes outputted by the compiler.
4145 - [Added `powerpc-unknown-netbsd` target.][48281]
4149 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4150 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4151 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4152 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4153 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4154 - [`ascii::escape_default` is now available in libcore.][48735]
4155 - [Trailing commas are now supported in std and core macros.][48056]
4156 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4157 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4162 - [`*const T::copy_to_nonoverlapping`]
4163 - [`*const T::copy_to`]
4164 - [`*const T::read_unaligned`]
4165 - [`*const T::read_volatile`]
4166 - [`*const T::read`]
4168 - [`*const T::wrapping_add`]
4169 - [`*const T::wrapping_sub`]
4171 - [`*mut T::copy_to_nonoverlapping`]
4172 - [`*mut T::copy_to`]
4173 - [`*mut T::read_unaligned`]
4174 - [`*mut T::read_volatile`]
4176 - [`*mut T::replace`]
4179 - [`*mut T::wrapping_add`]
4180 - [`*mut T::wrapping_sub`]
4181 - [`*mut T::write_bytes`]
4182 - [`*mut T::write_unaligned`]
4183 - [`*mut T::write_volatile`]
4186 - [`FromUtf8Error::as_bytes`]
4187 - [`LocalKey::try_with`]
4188 - [`Option::cloned`]
4189 - [`btree_map::Entry::and_modify`]
4190 - [`fs::read_to_string`]
4193 - [`hash_map::Entry::and_modify`]
4194 - [`iter::FusedIterator`]
4195 - [`ops::RangeInclusive`]
4196 - [`ops::RangeToInclusive`]
4198 - [`slice::rotate_left`]
4199 - [`slice::rotate_right`]
4200 - [`String::retain`]
4205 - [Cargo will now output path to custom commands when `-v` is
4206 passed with `--list`][cargo/5041]
4207 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4211 - [The second edition of "The Rust Programming Language" book is now recommended
4212 over the first.][48404]
4217 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4218 syntax is now invalid.
4220 use std::ops::Fn as dyn;
4221 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4223 - [The result of dereferences are no longer promoted to `'static`.][47408]
4227 const PAIR: &(i32, i32) = &(0, 1);
4228 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4231 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4232 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4234 - [Removed hoedown from rustdoc.][48274]
4235 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4237 [46882]: https://github.com/rust-lang/rust/pull/46882
4238 [47379]: https://github.com/rust-lang/rust/pull/47379
4239 [47408]: https://github.com/rust-lang/rust/pull/47408
4240 [47813]: https://github.com/rust-lang/rust/pull/47813
4241 [48056]: https://github.com/rust-lang/rust/pull/48056
4242 [48125]: https://github.com/rust-lang/rust/pull/48125
4243 [48166]: https://github.com/rust-lang/rust/pull/48166
4244 [48235]: https://github.com/rust-lang/rust/pull/48235
4245 [48274]: https://github.com/rust-lang/rust/pull/48274
4246 [48281]: https://github.com/rust-lang/rust/pull/48281
4247 [48296]: https://github.com/rust-lang/rust/pull/48296
4248 [48326]: https://github.com/rust-lang/rust/pull/48326
4249 [48359]: https://github.com/rust-lang/rust/pull/48359
4250 [48404]: https://github.com/rust-lang/rust/pull/48404
4251 [48481]: https://github.com/rust-lang/rust/pull/48481
4252 [48516]: https://github.com/rust-lang/rust/pull/48516
4253 [48628]: https://github.com/rust-lang/rust/pull/48628
4254 [48629]: https://github.com/rust-lang/rust/pull/48629
4255 [48657]: https://github.com/rust-lang/rust/pull/48657
4256 [48735]: https://github.com/rust-lang/rust/pull/48735
4257 [48978]: https://github.com/rust-lang/rust/pull/48978
4258 [49101]: https://github.com/rust-lang/rust/pull/49101
4259 [49109]: https://github.com/rust-lang/rust/pull/49109
4260 [49121]: https://github.com/rust-lang/rust/pull/49121
4261 [49162]: https://github.com/rust-lang/rust/pull/49162
4262 [49184]: https://github.com/rust-lang/rust/pull/49184
4263 [49234]: https://github.com/rust-lang/rust/pull/49234
4264 [49255]: https://github.com/rust-lang/rust/pull/49255
4265 [49299]: https://github.com/rust-lang/rust/pull/49299
4266 [49305]: https://github.com/rust-lang/rust/pull/49305
4267 [49394]: https://github.com/rust-lang/rust/pull/49394
4268 [49458]: https://github.com/rust-lang/rust/pull/49458
4269 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4270 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4271 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4272 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4273 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4274 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4275 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4276 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4277 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4278 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4279 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4280 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4281 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4282 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4283 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4284 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4285 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4286 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4287 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4288 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4289 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4290 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4291 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4292 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4293 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4294 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4295 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4296 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4297 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4298 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4299 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4300 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4301 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4302 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4303 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4304 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4305 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4306 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4307 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4308 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4309 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4310 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4313 Version 1.25.0 (2018-03-29)
4314 ==========================
4318 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4319 - [You can now use nested groups of imports.][47948]
4320 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4321 - [You can now have `|` at the start of a match arm.][47947] e.g.
4323 enum Foo { A, B, C }
4329 | Foo::B => println!("AB"),
4330 | Foo::C => println!("C"),
4337 - [Upgraded to LLVM 6.][47828]
4338 - [Added `-C lto=val` option.][47521]
4339 - [Added `i586-unknown-linux-musl` target][47282]
4343 - [Impl Send for `process::Command` on Unix.][47760]
4344 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4345 - [`UnsafeCell::into_inner` is now safe.][47204]
4346 - [Implement libstd for CloudABI.][47268]
4347 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4348 - [Implement `AsRef<Path>` for Component][46985]
4349 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4350 - [Moved `Duration` to libcore.][46666]
4354 - [`Location::column`]
4357 The following functions can now be used in a constant expression.
4358 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4359 - [`Duration::new`][47300]
4360 - [`Duration::from_secs`][47300]
4361 - [`Duration::from_millis`][47300]
4365 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4366 - [`cargo new` now defaults to creating a binary crate, instead of a
4367 library crate.][cargo/5029]
4371 - [Rust by example is now shipped with new releases][46196]
4375 - [Deprecated `net::lookup_host`.][47510]
4376 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4377 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4378 around indexing operations (see [#47349][47349]). This has been fixed (which also
4379 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4380 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4382 [33903]: https://github.com/rust-lang/rust/pull/33903
4383 [47947]: https://github.com/rust-lang/rust/pull/47947
4384 [47948]: https://github.com/rust-lang/rust/pull/47948
4385 [47760]: https://github.com/rust-lang/rust/pull/47760
4386 [47790]: https://github.com/rust-lang/rust/pull/47790
4387 [47828]: https://github.com/rust-lang/rust/pull/47828
4388 [47398]: https://github.com/rust-lang/rust/pull/47398
4389 [47510]: https://github.com/rust-lang/rust/pull/47510
4390 [47521]: https://github.com/rust-lang/rust/pull/47521
4391 [47204]: https://github.com/rust-lang/rust/pull/47204
4392 [47251]: https://github.com/rust-lang/rust/pull/47251
4393 [47268]: https://github.com/rust-lang/rust/pull/47268
4394 [47282]: https://github.com/rust-lang/rust/pull/47282
4395 [47300]: https://github.com/rust-lang/rust/pull/47300
4396 [47349]: https://github.com/rust-lang/rust/pull/47349
4397 [46931]: https://github.com/rust-lang/rust/pull/46931
4398 [46985]: https://github.com/rust-lang/rust/pull/46985
4399 [47006]: https://github.com/rust-lang/rust/pull/47006
4400 [46830]: https://github.com/rust-lang/rust/pull/46830
4401 [46095]: https://github.com/rust-lang/rust/pull/46095
4402 [46666]: https://github.com/rust-lang/rust/pull/46666
4403 [46196]: https://github.com/rust-lang/rust/pull/46196
4404 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4405 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4406 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4407 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4408 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4411 Version 1.24.1 (2018-03-01)
4412 ==========================
4414 - [Do not abort when unwinding through FFI][48251]
4415 - [Emit UTF-16 files for linker arguments on Windows][48318]
4416 - [Make the error index generator work again][48308]
4417 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4419 [48251]: https://github.com/rust-lang/rust/issues/48251
4420 [48308]: https://github.com/rust-lang/rust/issues/48308
4421 [48318]: https://github.com/rust-lang/rust/issues/48318
4422 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4425 Version 1.24.0 (2018-02-15)
4426 ==========================
4430 - [External `sysv64` ffi is now available.][46528]
4431 eg. `extern "sysv64" fn foo () {}`
4435 - [rustc now uses 16 codegen units by default for release builds.][46910]
4436 For the fastest builds, utilize `codegen-units=1`.
4437 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4438 - [Add `aarch64-unknown-openbsd` support][46760]
4442 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4443 improvement in performance in the majority of cases.
4444 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4445 with Windows.][46798]
4446 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4447 - [impl `From<bool>` for `AtomicBool`][46293]
4448 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4449 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4450 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4451 - [float::from_bits now just uses transmute.][46012] This provides
4452 some optimisations from LLVM.
4453 - [Copied `AsciiExt` methods onto `char`][46077]
4454 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4455 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4456 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4457 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4461 - [`RefCell::replace`]
4463 - [`atomic::spin_loop_hint`]
4465 The following functions can now be used in a constant expression.
4466 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4468 - [`AtomicBool::new`][46287]
4469 - [`AtomicUsize::new`][46287]
4470 - [`AtomicIsize::new`][46287]
4471 - [`AtomicPtr::new`][46287]
4472 - [`Cell::new`][46287]
4473 - [`{integer}::min_value`][46287]
4474 - [`{integer}::max_value`][46287]
4475 - [`mem::size_of`][46287]
4476 - [`mem::align_of`][46287]
4477 - [`ptr::null`][46287]
4478 - [`ptr::null_mut`][46287]
4479 - [`RefCell::new`][46287]
4480 - [`UnsafeCell::new`][46287]
4484 - [Added a `workspace.default-members` config that
4485 overrides implied `--all` in virtual workspaces.][cargo/4743]
4486 - [Enable incremental by default on development builds.][cargo/4817] Also added
4487 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4488 per-project or global basis respectively.
4495 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4496 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4497 in accordance with IETF RFC 4291 §2.2.
4498 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4499 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4500 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4501 - [Leading zeros in tuple struct members is now an error][47084]
4502 - [`column!()` macro is one-based instead of zero-based][46977]
4503 - [`fmt::Arguments` can no longer be shared across threads][45198]
4504 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4505 - [Cargo sets a different working directory for the compiler][cargo/4788]
4507 [44884]: https://github.com/rust-lang/rust/pull/44884
4508 [45198]: https://github.com/rust-lang/rust/pull/45198
4509 [45506]: https://github.com/rust-lang/rust/pull/45506
4510 [45904]: https://github.com/rust-lang/rust/pull/45904
4511 [45990]: https://github.com/rust-lang/rust/pull/45990
4512 [46012]: https://github.com/rust-lang/rust/pull/46012
4513 [46077]: https://github.com/rust-lang/rust/pull/46077
4514 [46094]: https://github.com/rust-lang/rust/pull/46094
4515 [46284]: https://github.com/rust-lang/rust/pull/46284
4516 [46287]: https://github.com/rust-lang/rust/pull/46287
4517 [46293]: https://github.com/rust-lang/rust/pull/46293
4518 [46528]: https://github.com/rust-lang/rust/pull/46528
4519 [46671]: https://github.com/rust-lang/rust/pull/46671
4520 [46713]: https://github.com/rust-lang/rust/pull/46713
4521 [46735]: https://github.com/rust-lang/rust/pull/46735
4522 [46749]: https://github.com/rust-lang/rust/pull/46749
4523 [46760]: https://github.com/rust-lang/rust/pull/46760
4524 [46798]: https://github.com/rust-lang/rust/pull/46798
4525 [46828]: https://github.com/rust-lang/rust/pull/46828
4526 [46831]: https://github.com/rust-lang/rust/pull/46831
4527 [46833]: https://github.com/rust-lang/rust/pull/46833
4528 [46910]: https://github.com/rust-lang/rust/pull/46910
4529 [46977]: https://github.com/rust-lang/rust/pull/46977
4530 [47018]: https://github.com/rust-lang/rust/pull/47018
4531 [47080]: https://github.com/rust-lang/rust/pull/47080
4532 [47084]: https://github.com/rust-lang/rust/pull/47084
4533 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4534 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4535 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4536 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4537 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4538 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4541 Version 1.23.0 (2018-01-04)
4542 ==========================
4546 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4547 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4548 Which should fix some confusing errors in some operations.
4552 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4553 undefined behavior.][45920]
4554 - [rustc now suggests renaming import if names clash.][45660]
4555 - [Display errors/warnings correctly when there are zero-width or
4556 wide characters.][45711]
4557 - [rustc now avoids unnecessary copies of arguments that are
4558 simple bindings][45380] This should improve memory usage on average by 5-10%.
4559 - [Updated musl used to build musl rustc to 1.1.17][45393]
4563 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4564 - [Implement Hash for raw pointers to unsized types][45483]
4565 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4566 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4567 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4568 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4569 and `<*mut T>::as_mut`][44932]
4570 - [Optimized `Thread::{park, unpark}` implementation][45524]
4571 - [Improved `SliceExt::binary_search` performance.][45333]
4572 - [impl `FromIterator<()>` for `()`][45379]
4573 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4581 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4582 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4583 - [Added unit test checking to `cargo check`][cargo/4592]
4584 - [Cargo now lets you install a specific version
4585 using `cargo install --version`][cargo/4637]
4589 - [Releases now ship with the Cargo book documentation.][45692]
4590 - [rustdoc now prints rendering warnings on every run.][45324]
4594 - [Changes have been made to type equality to make it more correct,
4595 in rare cases this could break some code.][45853] [Tracking issue for
4596 further information][45852]
4597 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4598 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4599 Android 9, the minimum supported version is Android 14.
4600 - [Bumped the minimum LLVM to 3.9][45326]
4602 [44042]: https://github.com/rust-lang/rust/pull/44042
4603 [44932]: https://github.com/rust-lang/rust/pull/44932
4604 [45267]: https://github.com/rust-lang/rust/pull/45267
4605 [45324]: https://github.com/rust-lang/rust/pull/45324
4606 [45326]: https://github.com/rust-lang/rust/pull/45326
4607 [45333]: https://github.com/rust-lang/rust/pull/45333
4608 [45379]: https://github.com/rust-lang/rust/pull/45379
4609 [45380]: https://github.com/rust-lang/rust/pull/45380
4610 [45393]: https://github.com/rust-lang/rust/pull/45393
4611 [45435]: https://github.com/rust-lang/rust/pull/45435
4612 [45483]: https://github.com/rust-lang/rust/pull/45483
4613 [45524]: https://github.com/rust-lang/rust/pull/45524
4614 [45571]: https://github.com/rust-lang/rust/pull/45571
4615 [45580]: https://github.com/rust-lang/rust/pull/45580
4616 [45610]: https://github.com/rust-lang/rust/pull/45610
4617 [45660]: https://github.com/rust-lang/rust/pull/45660
4618 [45692]: https://github.com/rust-lang/rust/pull/45692
4619 [45711]: https://github.com/rust-lang/rust/pull/45711
4620 [45772]: https://github.com/rust-lang/rust/pull/45772
4621 [45852]: https://github.com/rust-lang/rust/issues/45852
4622 [45853]: https://github.com/rust-lang/rust/pull/45853
4623 [45887]: https://github.com/rust-lang/rust/pull/45887
4624 [45920]: https://github.com/rust-lang/rust/pull/45920
4625 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4626 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4627 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4630 Version 1.22.1 (2017-11-22)
4631 ==========================
4633 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4635 [46183]: https://github.com/rust-lang/rust/pull/46183
4637 Version 1.22.0 (2017-11-22)
4638 ==========================
4642 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4643 - [Now accepts underscores in unicode escapes][43716]
4644 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4645 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4649 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4650 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4651 This should decrease compile times for debug builds.
4652 - [strict memory alignment now enabled on ARMv6][45094]
4653 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4657 - [Allow atomic operations up to 32 bits
4658 on `armv5te_unknown_linux_gnueabi`][44978]
4659 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4660 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4661 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4662 - [Properly detect overflow in `Instant += Duration`.][44220]
4663 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4664 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4665 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4672 - [Cargo will now build multi file examples in subdirectories of the `examples`
4673 folder that have a `main.rs` file.][cargo/4496]
4674 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4675 the old format will continue to work and can be updated with `cargo update`.
4676 - [Now supports vendoring git repositories][cargo/3992]
4680 - [`libbacktrace` is now available on Apple platforms.][44251]
4681 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4682 This now lets you specify that a given code example will fail to compile.
4686 - [The minimum Android version that rustc can build for has been bumped
4687 to `4.0` from `2.3`][45656]
4688 - [Allowing `T op= &T` for numeric types has broken some type
4689 inference cases][45480]
4692 [42526]: https://github.com/rust-lang/rust/pull/42526
4693 [43017]: https://github.com/rust-lang/rust/pull/43017
4694 [43716]: https://github.com/rust-lang/rust/pull/43716
4695 [43949]: https://github.com/rust-lang/rust/pull/43949
4696 [44015]: https://github.com/rust-lang/rust/pull/44015
4697 [44220]: https://github.com/rust-lang/rust/pull/44220
4698 [44251]: https://github.com/rust-lang/rust/pull/44251
4699 [44287]: https://github.com/rust-lang/rust/pull/44287
4700 [44303]: https://github.com/rust-lang/rust/pull/44303
4701 [44456]: https://github.com/rust-lang/rust/pull/44456
4702 [44466]: https://github.com/rust-lang/rust/pull/44466
4703 [44895]: https://github.com/rust-lang/rust/pull/44895
4704 [44966]: https://github.com/rust-lang/rust/pull/44966
4705 [44978]: https://github.com/rust-lang/rust/pull/44978
4706 [45041]: https://github.com/rust-lang/rust/pull/45041
4707 [45064]: https://github.com/rust-lang/rust/pull/45064
4708 [45075]: https://github.com/rust-lang/rust/pull/45075
4709 [45094]: https://github.com/rust-lang/rust/pull/45094
4710 [45095]: https://github.com/rust-lang/rust/pull/45095
4711 [45480]: https://github.com/rust-lang/rust/issues/45480
4712 [45656]: https://github.com/rust-lang/rust/pull/45656
4713 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4714 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4715 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4722 Version 1.21.0 (2017-10-12)
4723 ==========================
4727 - [You can now use static references for literals.][43838]
4731 let x: &'static u32 = &0;
4734 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4737 my_macro!(Vec<i32>::new); // Always worked
4738 my_macro!(Vec::<i32>::new); // Now works
4743 - [Upgraded jemalloc to 4.5.0][43911]
4744 - [Enabled unwinding panics on Redox][43917]
4745 - [Now runs LLVM in parallel during translation phase.][43506]
4746 This should reduce peak memory usage.
4750 - [Generate builtin impls for `Clone` for all arrays and tuples that
4751 are `T: Clone`][43690]
4752 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4753 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4754 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4759 [`std::mem::discriminant`]
4763 - [You can now call `cargo install` with multiple package names][cargo/4216]
4764 - [Cargo commands inside a virtual workspace will now implicitly
4765 pass `--all`][cargo/4335]
4766 - [Added a `[patch]` section to `Cargo.toml` to handle
4767 prepublication dependencies][cargo/4123] [RFC 1969]
4768 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4769 like patterns][cargo/4270]
4770 - [Added the `--all-targets` option][cargo/4400]
4771 - [Using required dependencies as a feature is now deprecated and emits
4772 a warning][cargo/4364]
4777 - [Cargo docs are moving][43916]
4778 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4779 - [The rustdoc book is now available][43863]
4780 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4781 - [Added a preview of RLS has been made available through rustup][44204]
4782 Install with `rustup component add rls-preview`
4783 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4784 Previously only showed `std::os::unix`.
4788 - [Changes in method matching against higher-ranked types][43880] This may cause
4789 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4790 - [rustc's JSON error output's byte position start at top of file.][42973]
4791 Was previously relative to the rustc's internal `CodeMap` struct which
4792 required the unstable library `libsyntax` to correctly use.
4793 - [`unused_results` lint no longer ignores booleans][43728]
4795 [42565]: https://github.com/rust-lang/rust/pull/42565
4796 [42973]: https://github.com/rust-lang/rust/pull/42973
4797 [43348]: https://github.com/rust-lang/rust/pull/43348
4798 [43459]: https://github.com/rust-lang/rust/pull/43459
4799 [43506]: https://github.com/rust-lang/rust/pull/43506
4800 [43540]: https://github.com/rust-lang/rust/pull/43540
4801 [43690]: https://github.com/rust-lang/rust/pull/43690
4802 [43728]: https://github.com/rust-lang/rust/pull/43728
4803 [43838]: https://github.com/rust-lang/rust/pull/43838
4804 [43863]: https://github.com/rust-lang/rust/pull/43863
4805 [43880]: https://github.com/rust-lang/rust/pull/43880
4806 [43911]: https://github.com/rust-lang/rust/pull/43911
4807 [43916]: https://github.com/rust-lang/rust/pull/43916
4808 [43917]: https://github.com/rust-lang/rust/pull/43917
4809 [44204]: https://github.com/rust-lang/rust/pull/44204
4810 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4811 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4812 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4813 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4814 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4815 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4816 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4817 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4818 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4820 Version 1.20.0 (2017-08-31)
4821 ===========================
4825 - [Associated constants are now stabilised.][42809]
4826 - [A lot of macro bugs are now fixed.][42913]
4831 - [Struct fields are now properly coerced to the expected field type.][42807]
4832 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4833 `wasm32-experimental-emscripten` target.
4834 - [Changed some of the error messages to be more helpful.][42033]
4835 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4837 - [rustc now reports the total number of errors on compilation failure][43015]
4838 previously this was only the number of errors in the pass that failed.
4839 - [Expansion in rustc has been sped up 29x.][42533]
4840 - [added `msp430-none-elf` target.][43099]
4841 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4843 - [Fixes backtraces on Redox][43228]
4844 - [rustc now identifies different versions of same crate when absolute paths of
4845 different types match in an error message.][42826]
4851 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4852 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4854 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4855 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4856 - [Impl `Clone` for `DefaultHasher`.][42799]
4857 - [Impl `Sync` for `SyncSender`.][42397]
4858 - [Impl `FromStr` for `char`][42271]
4859 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4861 - [allow messages in the `unimplemented!()` macro.][42155]
4862 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4863 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4864 - [Upgrade to Unicode 10.0.0][42999]
4865 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4866 - [Skip the main thread's manual stack guard on Linux][43072]
4867 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4868 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4870 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4875 - [`CStr::into_c_string`]
4876 - [`CString::as_c_str`]
4877 - [`CString::into_boxed_c_str`]
4878 - [`Chain::get_mut`]
4879 - [`Chain::get_ref`]
4880 - [`Chain::into_inner`]
4881 - [`Option::get_or_insert_with`]
4882 - [`Option::get_or_insert`]
4883 - [`OsStr::into_os_string`]
4884 - [`OsString::into_boxed_os_str`]
4887 - [`Utf8Error::error_len`]
4888 - [`char::EscapeDebug`]
4889 - [`char::escape_debug`]
4890 - [`compile_error!`]
4891 - [`f32::from_bits`]
4893 - [`f64::from_bits`]
4895 - [`mem::ManuallyDrop`]
4896 - [`slice::sort_unstable_by_key`]
4897 - [`slice::sort_unstable_by`]
4898 - [`slice::sort_unstable`]
4899 - [`str::from_boxed_utf8_unchecked`]
4900 - [`str::as_bytes_mut`]
4901 - [`str::as_bytes_mut`]
4902 - [`str::from_utf8_mut`]
4903 - [`str::from_utf8_unchecked_mut`]
4905 - [`str::get_unchecked_mut`]
4906 - [`str::get_unchecked`]
4908 - [`str::into_boxed_bytes`]
4913 - [Cargo API token location moved from `~/.cargo/config` to
4914 `~/.cargo/credentials`.][cargo/3978]
4915 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4916 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4917 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4918 - [You can now specify version of a binary when installed through
4919 `cargo install` using `--vers`.][cargo/4229]
4920 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4921 failure.][cargo/4248]
4922 - [Changed the convention around which file is the crate root.][cargo/4259]
4923 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4924 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4929 - [Functions with `'static` in their return types will now not be as usable as
4930 if they were using lifetime parameters instead.][42417]
4931 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4932 takes the sign of NaN into account where previously didn't.][42430]
4934 [42033]: https://github.com/rust-lang/rust/pull/42033
4935 [42155]: https://github.com/rust-lang/rust/pull/42155
4936 [42271]: https://github.com/rust-lang/rust/pull/42271
4937 [42397]: https://github.com/rust-lang/rust/pull/42397
4938 [42417]: https://github.com/rust-lang/rust/pull/42417
4939 [42430]: https://github.com/rust-lang/rust/pull/42430
4940 [42431]: https://github.com/rust-lang/rust/pull/42431
4941 [42533]: https://github.com/rust-lang/rust/pull/42533
4942 [42571]: https://github.com/rust-lang/rust/pull/42571
4943 [42613]: https://github.com/rust-lang/rust/pull/42613
4944 [42799]: https://github.com/rust-lang/rust/pull/42799
4945 [42807]: https://github.com/rust-lang/rust/pull/42807
4946 [42809]: https://github.com/rust-lang/rust/pull/42809
4947 [42822]: https://github.com/rust-lang/rust/pull/42822
4948 [42826]: https://github.com/rust-lang/rust/pull/42826
4949 [42854]: https://github.com/rust-lang/rust/pull/42854
4950 [42913]: https://github.com/rust-lang/rust/pull/42913
4951 [42999]: https://github.com/rust-lang/rust/pull/42999
4952 [43011]: https://github.com/rust-lang/rust/pull/43011
4953 [43015]: https://github.com/rust-lang/rust/pull/43015
4954 [43072]: https://github.com/rust-lang/rust/pull/43072
4955 [43077]: https://github.com/rust-lang/rust/pull/43077
4956 [43097]: https://github.com/rust-lang/rust/pull/43097
4957 [43099]: https://github.com/rust-lang/rust/pull/43099
4958 [43170]: https://github.com/rust-lang/rust/pull/43170
4959 [43178]: https://github.com/rust-lang/rust/pull/43178
4960 [43185]: https://github.com/rust-lang/rust/pull/43185
4961 [43228]: https://github.com/rust-lang/rust/pull/43228
4962 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4963 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4964 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4965 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4966 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4967 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4968 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4969 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4970 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4971 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4972 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4973 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4974 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4975 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4976 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4977 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4978 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4979 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4980 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4981 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4982 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4983 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4984 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4985 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4986 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4987 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4988 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4989 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4990 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4991 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4992 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4993 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4994 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4995 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4996 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4997 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4998 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4999 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5000 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5003 Version 1.19.0 (2017-07-20)
5004 ===========================
5009 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5010 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5011 - [Macro recursion limit increased to 1024 from 64.][41676]
5012 - [Added lint for detecting unused macros.][41907]
5013 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5014 For example: `let x = loop { break 7; };`
5015 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5016 contain `Copy` types and cannot have a `Drop` implementation.
5017 Example: `union Foo { bar: u8, baz: usize }`
5018 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5019 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5024 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5025 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5026 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5027 you should use `--target armv7-linux-androideabi`.
5028 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5029 - [Minor optimisation of string operations.][42037]
5030 - [Compiler error message is now `aborting due to previous error(s)` instead of
5031 `aborting due to N previous errors`][42150] This was previously inaccurate and
5032 would only count certain kinds of errors.
5033 - [The compiler now supports Visual Studio 2017][42225]
5034 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5035 - [Added a lot][42264] of [new error codes][42302]
5036 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5037 libraries with C Run-time Libraries(CRT) to be statically linked.
5038 - [Fixed various ARM codegen bugs][42740]
5043 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5044 `Extend<Cow<'a, str>>`][41449]
5045 - [`Vec` now implements `From<&mut [T]>`][41530]
5046 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5047 - [`SplitWhitespace` now implements `Clone`][41659]
5048 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5050 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5051 macros, but for printing to stderr.
5056 - [`OsString::shrink_to_fit`]
5059 - [`thread::ThreadId`]
5064 - [Build scripts can now add environment variables to the environment
5065 the crate is being compiled in.
5066 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5067 - [Subcommands now replace the current process rather than spawning a new
5068 child process][cargo/3970]
5069 - [Workspace members can now accept glob file patterns][cargo/3979]
5070 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5071 the members in a given workspace.][cargo/3988]
5072 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5073 - [Target directory path is now in the cargo metadata][cargo/4022]
5074 - [Cargo no longer checks out a local working directory for the
5075 crates.io index][cargo/4026] This should provide smaller file size for the
5076 registry, and improve cloning times, especially on Windows machines.
5077 - [Added an `--exclude` option for excluding certain packages when using the
5078 `--all` option][cargo/4031]
5079 - [Cargo will now automatically retry when receiving a 5xx error
5080 from crates.io][cargo/4032]
5081 - [The `--features` option now accepts multiple comma or space
5082 delimited values.][cargo/4084]
5083 - [Added support for custom target specific runners][cargo/3954]
5088 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5090 - [Rust will now release XZ compressed packages][rust-installer/57]
5091 - [rustup will now prefer to download rust packages with
5092 XZ compression][rustup/1100] over GZip packages.
5093 - [Added the ability to escape `#` in rust documentation][41785] By adding
5094 additional `#`'s ie. `##` is now `#`
5099 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5100 - [`-Z` flags are now no longer allowed to be used on the stable
5101 compiler.][41751] This has been a warning for a year previous to this.
5102 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5103 longer works][42844]. Users should migrate to the built-in `check`
5104 command, which has been available since 1.16.
5105 - [Ending a float literal with `._` is now a hard error.
5106 Example: `42._` .][41946]
5107 - [Any use of a private `extern crate` outside of its module is now a
5108 hard error.][36886] This was previously a warning.
5109 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5110 relative while the `::` prefix makes a path absolute, but was ignored and the
5111 path was relative regardless.
5112 - [Floating point constants in match patterns is now a hard error][36890]
5113 This was previously a warning.
5114 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5115 match patterns is now a hard error][36891] This was previously a warning.
5116 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5118 - [From the pound escape, lines consisting of multiple `#`s are
5120 - [It is an error to re-export private enum variants][42460]. This is
5121 known to break a number of crates that depend on an older version of
5123 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5124 to use it to find the linker, and the build will fail where it did
5125 not previously][42607]
5127 [36886]: https://github.com/rust-lang/rust/issues/36886
5128 [36888]: https://github.com/rust-lang/rust/issues/36888
5129 [36890]: https://github.com/rust-lang/rust/issues/36890
5130 [36891]: https://github.com/rust-lang/rust/issues/36891
5131 [36892]: https://github.com/rust-lang/rust/issues/36892
5132 [37406]: https://github.com/rust-lang/rust/issues/37406
5133 [39983]: https://github.com/rust-lang/rust/pull/39983
5134 [41145]: https://github.com/rust-lang/rust/pull/41145
5135 [41192]: https://github.com/rust-lang/rust/pull/41192
5136 [41258]: https://github.com/rust-lang/rust/pull/41258
5137 [41370]: https://github.com/rust-lang/rust/pull/41370
5138 [41449]: https://github.com/rust-lang/rust/pull/41449
5139 [41530]: https://github.com/rust-lang/rust/pull/41530
5140 [41624]: https://github.com/rust-lang/rust/pull/41624
5141 [41656]: https://github.com/rust-lang/rust/pull/41656
5142 [41659]: https://github.com/rust-lang/rust/pull/41659
5143 [41676]: https://github.com/rust-lang/rust/pull/41676
5144 [41751]: https://github.com/rust-lang/rust/pull/41751
5145 [41764]: https://github.com/rust-lang/rust/pull/41764
5146 [41785]: https://github.com/rust-lang/rust/pull/41785
5147 [41873]: https://github.com/rust-lang/rust/pull/41873
5148 [41907]: https://github.com/rust-lang/rust/pull/41907
5149 [41946]: https://github.com/rust-lang/rust/pull/41946
5150 [42016]: https://github.com/rust-lang/rust/pull/42016
5151 [42037]: https://github.com/rust-lang/rust/pull/42037
5152 [42068]: https://github.com/rust-lang/rust/pull/42068
5153 [42150]: https://github.com/rust-lang/rust/pull/42150
5154 [42162]: https://github.com/rust-lang/rust/pull/42162
5155 [42225]: https://github.com/rust-lang/rust/pull/42225
5156 [42264]: https://github.com/rust-lang/rust/pull/42264
5157 [42302]: https://github.com/rust-lang/rust/pull/42302
5158 [42460]: https://github.com/rust-lang/rust/issues/42460
5159 [42607]: https://github.com/rust-lang/rust/issues/42607
5160 [42740]: https://github.com/rust-lang/rust/pull/42740
5161 [42844]: https://github.com/rust-lang/rust/issues/42844
5162 [42948]: https://github.com/rust-lang/rust/pull/42948
5163 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5164 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5165 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5166 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5167 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5168 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5169 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5170 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5171 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5172 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5173 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5174 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5175 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5176 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5177 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5178 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5179 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5180 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5181 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5182 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5183 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5184 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5187 Version 1.18.0 (2017-06-08)
5188 ===========================
5193 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5194 make the item visible to just that module tree. Also accepts the keyword
5195 `crate` to make something public to the whole crate but not users of the
5196 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5197 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5198 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5199 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5200 types like `Write + Send`, trailing `+` are now supported in trait objects,
5201 and better error reporting for trait objects starting with `?Sized`.
5202 - [0e+10 is now a valid floating point literal][40589]
5203 - [Now warns if you bind a lifetime parameter to 'static][40734]
5204 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5205 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5206 representation in some cases.][40377]
5211 - [rustc can now emit mir with `--emit mir`][39891]
5212 - [Improved LLVM IR for trivial functions][40367]
5213 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5214 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5215 opportunities found through profiling
5216 - [Improved backtrace formatting when panicking][38165]
5221 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5222 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5223 iteration or reallocation.
5224 - [Simplified HashMap Bucket interface][40561] provides performance
5225 improvements for iterating and cloning.
5226 - [Specialize Vec::from_elem to use calloc][40409]
5227 - [Fixed Race condition in fs::create_dir_all][39799]
5228 - [No longer caching stdio on Windows][40516]
5229 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5230 2.50%~ faster and in one case now 12.50% faster.
5231 - [Optimized `AtomicBool::fetch_nand`][41143]
5236 - [`Child::try_wait`]
5237 - [`HashMap::retain`]
5238 - [`HashSet::retain`]
5240 - [`TcpStream::peek`]
5241 - [`UdpSocket::peek`]
5242 - [`UdpSocket::peek_from`]
5247 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5248 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5249 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5250 - [Added Android build support][cargo/3885]
5251 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5252 of a certain type, for example `cargo build --bins` will build all
5254 - [Added support for haiku][cargo/3952]
5259 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5260 - [Added rust-windbg script for better debugging on Windows][39983]
5261 - [Rust now uses the official cross compiler for NetBSD][40612]
5262 - [rustdoc now accepts `#` at the start of files][40828]
5263 - [Fixed jemalloc support for musl][41168]
5268 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5269 always placed after the sign if it exists and before the digits. With the `#`
5270 flag the zeroes are placed after the prefix and before the digits.
5271 - [Due to the struct field optimisation][40377], using `transmute` on structs
5272 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5273 always been undefined behavior, but is now more likely to break in practice.
5274 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5275 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5276 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5277 - [Overlapping inherent `impl`s are now a hard error][40728]
5278 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5279 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5280 `out.asm` and `out.ll` instead of only one of the filetypes.
5281 - [ calling a function that returns `Self` will no longer work][41805] when
5282 the size of `Self` cannot be statically determined.
5283 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5284 this has caused a few regressions namely:
5286 - Changed the link order of local static/dynamic libraries (respecting the
5287 order on given rather than having the compiler reorder).
5288 - Changed how MinGW is linked, native code linked to dynamic libraries
5289 may require manually linking to the gcc support library (for the native
5292 [38165]: https://github.com/rust-lang/rust/pull/38165
5293 [39799]: https://github.com/rust-lang/rust/pull/39799
5294 [39891]: https://github.com/rust-lang/rust/pull/39891
5295 [39983]: https://github.com/rust-lang/rust/pull/39983
5296 [40043]: https://github.com/rust-lang/rust/pull/40043
5297 [40241]: https://github.com/rust-lang/rust/pull/40241
5298 [40338]: https://github.com/rust-lang/rust/pull/40338
5299 [40367]: https://github.com/rust-lang/rust/pull/40367
5300 [40377]: https://github.com/rust-lang/rust/pull/40377
5301 [40409]: https://github.com/rust-lang/rust/pull/40409
5302 [40516]: https://github.com/rust-lang/rust/pull/40516
5303 [40556]: https://github.com/rust-lang/rust/pull/40556
5304 [40561]: https://github.com/rust-lang/rust/pull/40561
5305 [40589]: https://github.com/rust-lang/rust/pull/40589
5306 [40612]: https://github.com/rust-lang/rust/pull/40612
5307 [40723]: https://github.com/rust-lang/rust/pull/40723
5308 [40728]: https://github.com/rust-lang/rust/pull/40728
5309 [40731]: https://github.com/rust-lang/rust/pull/40731
5310 [40734]: https://github.com/rust-lang/rust/pull/40734
5311 [40805]: https://github.com/rust-lang/rust/pull/40805
5312 [40807]: https://github.com/rust-lang/rust/pull/40807
5313 [40828]: https://github.com/rust-lang/rust/pull/40828
5314 [40870]: https://github.com/rust-lang/rust/pull/40870
5315 [41085]: https://github.com/rust-lang/rust/pull/41085
5316 [41143]: https://github.com/rust-lang/rust/pull/41143
5317 [41168]: https://github.com/rust-lang/rust/pull/41168
5318 [41270]: https://github.com/rust-lang/rust/issues/41270
5319 [41469]: https://github.com/rust-lang/rust/pull/41469
5320 [41805]: https://github.com/rust-lang/rust/issues/41805
5321 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5322 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5323 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5324 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5325 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5326 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5327 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5328 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5329 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5330 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5331 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5332 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5333 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5334 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5337 Version 1.17.0 (2017-04-27)
5338 ===========================
5343 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5344 * [Fields of structs may be initialized without duplicating the field/variable
5345 names][39761]. [RFC 1682]
5346 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5347 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5348 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5349 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5350 `'b`. Soundness fix.
5351 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5352 * [Static variables may contain references to other statics][40027]
5357 * [Exit quickly on only `--emit dep-info`][40336]
5358 * [Make `-C relocation-model` more correctly determine whether the linker
5359 creates a position-independent executable][40245]
5360 * [Add `-C overflow-checks` to directly control whether integer overflow
5362 * [The rustc type checker now checks items on demand instead of in a single
5363 in-order pass][40008]. This is mostly an internal refactoring in support of
5364 future work, including incremental type checking, but also resolves [RFC
5365 1647], allowing `Self` to appear in `impl` `where` clauses.
5366 * [Optimize vtable loads][39995]
5367 * [Turn off vectorization for Emscripten targets][39990]
5368 * [Provide suggestions for unknown macros imported with `use`][39953]
5369 * [Fix ICEs in path resolution][39939]
5370 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5371 * [Add clearer error message using `&str + &str`][39116]
5382 * [`Ordering::then`]
5383 * [`Ordering::then_with`]
5384 * [`BTreeMap::range`]
5385 * [`BTreeMap::range_mut`]
5386 * [`collections::Bound`]
5387 * [`process::abort`]
5388 * [`ptr::read_unaligned`]
5389 * [`ptr::write_unaligned`]
5390 * [`Result::expect_err`]
5393 * [`Cell::into_inner`]
5399 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5400 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5401 * [`String` implements `FromIterator<&char>`][40028]
5402 * `Box` [implements][40009] a number of new conversions:
5403 `From<Box<str>> for String`,
5404 `From<Box<[T]>> for Vec<T>`,
5405 `From<Box<CStr>> for CString`,
5406 `From<Box<OsStr>> for OsString`,
5407 `From<Box<Path>> for PathBuf`,
5408 `Into<Box<str>> for String`,
5409 `Into<Box<[T]>> for Vec<T>`,
5410 `Into<Box<CStr>> for CString`,
5411 `Into<Box<OsStr>> for OsString`,
5412 `Into<Box<Path>> for PathBuf`,
5413 `Default for Box<str>`,
5414 `Default for Box<CStr>`,
5415 `Default for Box<OsStr>`,
5416 `From<&CStr> for Box<CStr>`,
5417 `From<&OsStr> for Box<OsStr>`,
5418 `From<&Path> for Box<Path>`
5419 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5420 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5421 * [Slightly optimize `slice::sort`][39538]
5422 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5423 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5424 `Box<str>` implements `From<&str>`][39438]
5425 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5426 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5427 * [`format!` estimates the needed capacity before writing a string][39356]
5428 * [Support unprivileged symlink creation in Windows][38921]
5429 * [`PathBuf` implements `Default`][38764]
5430 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5431 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5432 and poor hash functions.
5437 * [Add `cargo check --all`][cargo/3731]
5438 * [Add an option to ignore SSL revocation checking][cargo/3699]
5439 * [Add `cargo run --package`][cargo/3691]
5440 * [Add `required_features`][cargo/3667]
5441 * [Assume `build.rs` is a build script][cargo/3664]
5442 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5447 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5449 * [The "Unstable Book" documents nightly-only features][ubook]
5450 * [Improve the style of the sidebar in rustdoc output][40265]
5451 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5452 * [Fix MSP430 breakage due to `i128`][40257]
5453 * [Preliminary Solaris/SPARCv9 support][39903]
5454 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5455 run without installing the MSVC runtime.
5456 * [`rustdoc --test` includes file names in test names][39788]
5457 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5458 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5459 * [Initial support for `aarch64-unknown-freebsd`][39491]
5460 * [Initial support for `i686-unknown-netbsd`][39426]
5461 * [This release no longer includes the old makefile build system][39431]. Rust
5462 is built with a custom build system, written in Rust, and with Cargo.
5463 * [Add Debug implementations for libcollection structs][39002]
5464 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5465 * [`--test-threads=0` produces an error][38945]
5466 * [`rustup` installs documentation by default][40526]
5467 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5468 WinDbg and Visual Studio to improve the debugging experience.
5473 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5474 workaround, either use MSVC 2015 or run vcvars.bat.
5475 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5476 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5477 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5479 * [`format!` and `Display::to_string` panic if an underlying formatting
5480 implementation returns an error][40117]. Previously the error was silently
5481 ignored. It is incorrect for `write_fmt` to return an error when writing
5483 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5484 crates were marked stable and could be accessed from the stable toolchain.
5485 * [Rust git source no longer includes vendored crates][39728]. Those that need
5486 to build with vendored crates should build from release tarballs.
5487 * [Fix inert attributes from `proc_macro_derives`][39572]
5488 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5489 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5491 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5492 existing code generally ignores the type of dead-code unless a type-hint is
5493 provided; this can cause surprising inference interactions particularly around
5494 defaulting. The new code uniformly ignores the result type of dead-code.
5495 * [Tuple-struct constructors with private fields are no longer visible][38932]
5496 * [Lifetime parameters that do not appear in the arguments are now considered
5497 early-bound][38897], resolving a soundness bug (#[32330]). The
5498 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5500 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5501 * [Make transmuting from fn item types to pointer-sized types a hard
5504 [27787]: https://github.com/rust-lang/rust/issues/27787
5505 [32330]: https://github.com/rust-lang/rust/issues/32330
5506 [34198]: https://github.com/rust-lang/rust/pull/34198
5507 [38161]: https://github.com/rust-lang/rust/pull/38161
5508 [38368]: https://github.com/rust-lang/rust/pull/38368
5509 [38584]: https://github.com/rust-lang/rust/issues/38584
5510 [38661]: https://github.com/rust-lang/rust/pull/38661
5511 [38764]: https://github.com/rust-lang/rust/pull/38764
5512 [38864]: https://github.com/rust-lang/rust/issues/38864
5513 [38897]: https://github.com/rust-lang/rust/pull/38897
5514 [38921]: https://github.com/rust-lang/rust/pull/38921
5515 [38932]: https://github.com/rust-lang/rust/pull/38932
5516 [38945]: https://github.com/rust-lang/rust/pull/38945
5517 [38981]: https://github.com/rust-lang/rust/pull/38981
5518 [39002]: https://github.com/rust-lang/rust/pull/39002
5519 [39116]: https://github.com/rust-lang/rust/pull/39116
5520 [39193]: https://github.com/rust-lang/rust/pull/39193
5521 [39265]: https://github.com/rust-lang/rust/pull/39265
5522 [39356]: https://github.com/rust-lang/rust/pull/39356
5523 [39372]: https://github.com/rust-lang/rust/pull/39372
5524 [39426]: https://github.com/rust-lang/rust/pull/39426
5525 [39431]: https://github.com/rust-lang/rust/pull/39431
5526 [39438]: https://github.com/rust-lang/rust/pull/39438
5527 [39440]: https://github.com/rust-lang/rust/pull/39440
5528 [39485]: https://github.com/rust-lang/rust/pull/39485
5529 [39491]: https://github.com/rust-lang/rust/pull/39491
5530 [39518]: https://github.com/rust-lang/rust/pull/39518
5531 [39538]: https://github.com/rust-lang/rust/pull/39538
5532 [39572]: https://github.com/rust-lang/rust/pull/39572
5533 [39633]: https://github.com/rust-lang/rust/pull/39633
5534 [39642]: https://github.com/rust-lang/rust/pull/39642
5535 [39728]: https://github.com/rust-lang/rust/pull/39728
5536 [39761]: https://github.com/rust-lang/rust/pull/39761
5537 [39788]: https://github.com/rust-lang/rust/pull/39788
5538 [39793]: https://github.com/rust-lang/rust/pull/39793
5539 [39837]: https://github.com/rust-lang/rust/pull/39837
5540 [39843]: https://github.com/rust-lang/rust/pull/39843
5541 [39851]: https://github.com/rust-lang/rust/pull/39851
5542 [39903]: https://github.com/rust-lang/rust/pull/39903
5543 [39939]: https://github.com/rust-lang/rust/pull/39939
5544 [39953]: https://github.com/rust-lang/rust/pull/39953
5545 [39960]: https://github.com/rust-lang/rust/pull/39960
5546 [39990]: https://github.com/rust-lang/rust/pull/39990
5547 [39995]: https://github.com/rust-lang/rust/pull/39995
5548 [40008]: https://github.com/rust-lang/rust/pull/40008
5549 [40009]: https://github.com/rust-lang/rust/pull/40009
5550 [40027]: https://github.com/rust-lang/rust/pull/40027
5551 [40028]: https://github.com/rust-lang/rust/pull/40028
5552 [40037]: https://github.com/rust-lang/rust/pull/40037
5553 [40117]: https://github.com/rust-lang/rust/pull/40117
5554 [40166]: https://github.com/rust-lang/rust/pull/40166
5555 [40245]: https://github.com/rust-lang/rust/pull/40245
5556 [40257]: https://github.com/rust-lang/rust/pull/40257
5557 [40261]: https://github.com/rust-lang/rust/pull/40261
5558 [40265]: https://github.com/rust-lang/rust/pull/40265
5559 [40319]: https://github.com/rust-lang/rust/pull/40319
5560 [40336]: https://github.com/rust-lang/rust/pull/40336
5561 [40526]: https://github.com/rust-lang/rust/pull/40526
5562 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5563 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5564 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5565 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5566 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5567 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5568 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5569 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5570 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5571 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5572 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5573 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5574 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5575 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5576 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5577 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5578 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5579 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5580 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5581 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5582 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5583 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5584 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5585 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5586 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5587 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5588 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5589 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5590 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5591 [mdbook]: https://crates.io/crates/mdbook
5592 [ubook]: https://doc.rust-lang.org/unstable-book/
5595 Version 1.16.0 (2017-03-16)
5596 ===========================
5601 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5602 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5603 match patterns][38069]
5604 * [Clean up semantics of `self` in an import list][38313]
5605 * [`Self` may appear in `impl` headers][38920]
5606 * [`Self` may appear in struct expressions][39282]
5611 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5612 a `.rmeta` file containing only crate metadata][38571]. This can be
5613 used by tools like the Rust Language Service to perform
5614 metadata-only builds.
5615 * [Levenshtein based typo suggestions now work in most places, while
5616 previously they worked only for fields and sometimes for local
5617 variables][38927]. Together with the overhaul of "no
5618 resolution"/"unexpected resolution" errors (#[38154]) they result in
5619 large and systematic improvement in resolution diagnostics.
5620 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5622 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5623 * [`rustc` no longer attempts to provide "consider using an explicit
5624 lifetime" suggestions][37057]. They were inaccurate.
5629 * [`VecDeque::truncate`]
5630 * [`VecDeque::resize`]
5631 * [`String::insert_str`]
5632 * [`Duration::checked_add`]
5633 * [`Duration::checked_sub`]
5634 * [`Duration::checked_div`]
5635 * [`Duration::checked_mul`]
5638 * [`SocketAddr::is_ipv4`]
5639 * [`SocketAddr::is_ipv6`]
5640 * [`IpAddr::is_ipv4`]
5641 * [`IpAddr::is_ipv6`]
5643 * [`Vec::dedup_by_key`]
5644 * [`Result::unwrap_or_default`]
5645 * [`<*const T>::wrapping_offset`]
5646 * [`<*mut T>::wrapping_offset`]
5647 * `CommandExt::creation_flags`
5648 * [`File::set_permissions`]
5649 * [`String::split_off`]
5654 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5655 their argument by `Borrow` parameter][37761]
5656 * [All public types in std implement `Debug`][38006]
5657 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5658 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5659 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5661 * [std: Fix partial writes in `LineWriter`][38062]
5662 * [std: Clamp max read/write sizes on Unix][38062]
5663 * [Use more specific panic message for `&str` slicing errors][38066]
5664 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5665 functionality cannot be achieved in std currently.
5666 * [`writeln!`, like `println!`, now accepts a form with no string
5667 or formatting arguments, to just print a newline][38469]
5668 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5669 * [Reduce the size of static data in `std_unicode::tables`][38781]
5670 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5671 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5673 * [`Duration` implements `Sum`][38712]
5674 * [`String` implements `ToSocketAddrs`][39048]
5679 * [The `cargo check` command does a type check of a project without
5680 building it][cargo/3296]
5681 * [crates.io will display CI badges from Travis and AppVeyor, if
5682 specified in Cargo.toml][cargo/3546]
5683 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5684 * [Compilation profiles accept integer values for `debug`, in addition
5685 to `true` and `false`. These are passed to `rustc` as the value to
5686 `-C debuginfo`][cargo/3534]
5687 * [Implement `cargo --version --verbose`][cargo/3604]
5688 * [All builds now output 'dep-info' build dependencies compatible with
5689 make and ninja][cargo/3557]
5690 * [Build all workspace members with `build --all`][cargo/3511]
5691 * [Document all workspace members with `doc --all`][cargo/3515]
5692 * [Path deps outside workspace are not members][cargo/3443]
5697 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5698 the path to the Rust implementation][38589]
5699 * [The `armv7-linux-androideabi` target no longer enables NEON
5700 extensions, per Google's ABI guide][38413]
5701 * [The stock standard library can be compiled for Redox OS][38401]
5702 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5704 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5706 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5711 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5712 match patterns][38069]
5713 * In this release, references to uninhabited types can not be
5714 pattern-matched. This was accidentally allowed in 1.15.
5715 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5716 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5718 * [Clean up semantics of `self` in an import list][38313]
5719 * Reimplemented lifetime elision. This change was almost entirely compatible
5720 with existing code, but it did close a number of small bugs and loopholes,
5721 as well as being more accepting in some other [cases][41105].
5723 [37057]: https://github.com/rust-lang/rust/pull/37057
5724 [37761]: https://github.com/rust-lang/rust/pull/37761
5725 [38006]: https://github.com/rust-lang/rust/pull/38006
5726 [38051]: https://github.com/rust-lang/rust/pull/38051
5727 [38062]: https://github.com/rust-lang/rust/pull/38062
5728 [38062]: https://github.com/rust-lang/rust/pull/38622
5729 [38066]: https://github.com/rust-lang/rust/pull/38066
5730 [38069]: https://github.com/rust-lang/rust/pull/38069
5731 [38131]: https://github.com/rust-lang/rust/pull/38131
5732 [38154]: https://github.com/rust-lang/rust/pull/38154
5733 [38274]: https://github.com/rust-lang/rust/pull/38274
5734 [38304]: https://github.com/rust-lang/rust/pull/38304
5735 [38313]: https://github.com/rust-lang/rust/pull/38313
5736 [38314]: https://github.com/rust-lang/rust/pull/38314
5737 [38327]: https://github.com/rust-lang/rust/pull/38327
5738 [38401]: https://github.com/rust-lang/rust/pull/38401
5739 [38413]: https://github.com/rust-lang/rust/pull/38413
5740 [38469]: https://github.com/rust-lang/rust/pull/38469
5741 [38559]: https://github.com/rust-lang/rust/pull/38559
5742 [38571]: https://github.com/rust-lang/rust/pull/38571
5743 [38580]: https://github.com/rust-lang/rust/pull/38580
5744 [38589]: https://github.com/rust-lang/rust/pull/38589
5745 [38670]: https://github.com/rust-lang/rust/pull/38670
5746 [38712]: https://github.com/rust-lang/rust/pull/38712
5747 [38726]: https://github.com/rust-lang/rust/pull/38726
5748 [38781]: https://github.com/rust-lang/rust/pull/38781
5749 [38798]: https://github.com/rust-lang/rust/pull/38798
5750 [38909]: https://github.com/rust-lang/rust/pull/38909
5751 [38920]: https://github.com/rust-lang/rust/pull/38920
5752 [38927]: https://github.com/rust-lang/rust/pull/38927
5753 [39048]: https://github.com/rust-lang/rust/pull/39048
5754 [39282]: https://github.com/rust-lang/rust/pull/39282
5755 [39379]: https://github.com/rust-lang/rust/pull/39379
5756 [41105]: https://github.com/rust-lang/rust/issues/41105
5757 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5758 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5759 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5760 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5761 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5762 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5763 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5764 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5765 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5766 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5767 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5768 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5769 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5770 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5771 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5772 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5773 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5774 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5775 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5776 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5777 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5778 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5779 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5780 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5781 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5782 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5783 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5784 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5785 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5786 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5789 Version 1.15.1 (2017-02-09)
5790 ===========================
5792 * [Fix IntoIter::as_mut_slice's signature][39466]
5793 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5795 [39466]: https://github.com/rust-lang/rust/pull/39466
5796 [39523]: https://github.com/rust-lang/rust/pull/39523
5799 Version 1.15.0 (2017-02-02)
5800 ===========================
5805 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5806 stable. This allows popular code-generating crates like Serde and Diesel to
5807 work ergonomically. [RFC 1681].
5808 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5809 with curly braces][36868]. Part of [RFC 1506].
5810 * [A number of minor changes to name resolution have been activated][37127].
5811 They add up to more consistent semantics, allowing for future evolution of
5812 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5813 details of what is different. The breaking changes here have been transitioned
5814 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5815 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5817 * [`?Sized` can be used in `where` clauses][37791]
5818 * [There is now a limit on the size of monomorphized types and it can be
5819 modified with the `#![type_size_limit]` crate attribute, similarly to
5820 the `#![recursion_limit]` attribute][37789]
5825 * [On Windows, the compiler will apply dllimport attributes when linking to
5826 extern functions][37973]. Additional attributes and flags can control which
5827 library kind is linked and its name. [RFC 1717].
5828 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5829 * [The `--test` flag works with procedural macro crates][38107]
5830 * [Fix `extern "aapcs" fn` ABI][37814]
5831 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5832 * [The `format!` expander recognizes incorrect `printf` and shell-style
5833 formatting directives and suggests the correct format][37613].
5834 * [Only report one error for all unused imports in an import list][37456]
5836 Compiler Performance
5837 --------------------
5839 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5840 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5841 * [Don't clone in `UnificationTable::probe`][37848]
5842 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5843 * [Use small vectors in type walker][37760]
5844 * [Macro expansion performance was improved][37701]
5845 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5846 * [Replace FNV with a faster hash function][37229]
5851 * [`std::iter::Iterator::min_by`]
5852 * [`std::iter::Iterator::max_by`]
5853 * [`std::os::*::fs::FileExt`]
5854 * [`std::sync::atomic::Atomic*::get_mut`]
5855 * [`std::sync::atomic::Atomic*::into_inner`]
5856 * [`std::vec::IntoIter::as_slice`]
5857 * [`std::vec::IntoIter::as_mut_slice`]
5858 * [`std::sync::mpsc::Receiver::try_iter`]
5859 * [`std::os::unix::process::CommandExt::before_exec`]
5860 * [`std::rc::Rc::strong_count`]
5861 * [`std::rc::Rc::weak_count`]
5862 * [`std::sync::Arc::strong_count`]
5863 * [`std::sync::Arc::weak_count`]
5864 * [`std::char::encode_utf8`]
5865 * [`std::char::encode_utf16`]
5866 * [`std::cell::Ref::clone`]
5867 * [`std::io::Take::into_inner`]
5872 * [The standard sorting algorithm has been rewritten for dramatic performance
5873 improvements][38192]. It is a hybrid merge sort, drawing influences from
5874 Timsort. Previously it was a naive merge sort.
5875 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5876 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5878 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5879 and `char_indices().last()`][37882]
5880 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5881 * [Chinese characters display correctly in `fmt::Debug`][37855]
5882 * [Derive `Default` for `Duration`][37699]
5883 * [Support creation of anonymous pipes on WinXP/2k][37677]
5884 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5885 * [Don't pass overlapped handles to processes][38835]
5890 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5891 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5892 should instead check the variable at runtime with `std::env`. That the value
5893 was set at build time was a bug, and incorrect when cross-compiling. This
5894 change is known to cause breakage.
5895 * [Add `--all` flag to `cargo test`][cargo/3221]
5896 * [Compile statically against the MSVC CRT][cargo/3363]
5897 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5898 * [Link OpenSSL statically on OSX][cargo/3311]
5899 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5900 * [Test for bad path overrides with summaries][cargo/3336]
5901 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5902 * [Fix retrying crate downloads for network errors][cargo/3348]
5903 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5904 * [Emit more info on --message-format=json][cargo/3319]
5905 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5906 * [Don't ignore errors in workspace manifest][cargo/3409]
5907 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5912 * [Test runners (binaries built with `--test`) now support a `--list` argument
5913 that lists the tests it contains][38185]
5914 * [Test runners now support a `--exact` argument that makes the test filter
5915 match exactly, instead of matching only a substring of the test name][38181]
5916 * [rustdoc supports a `--playground-url` flag][37763]
5917 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5922 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5923 continue to be used in this release by passing `--disable-rustbuild` to the
5924 configure script, but they will be deleted soon. Note that the new build
5925 system uses a different on-disk layout that will likely affect any scripts
5927 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5929 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5930 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5936 * [A number of minor changes to name resolution have been activated][37127].
5937 They add up to more consistent semantics, allowing for future evolution of
5938 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5939 details of what is different. The breaking changes here have been transitioned
5940 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5941 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5942 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5943 should instead check the variable at runtime with `std::env`. That the value
5944 was set at build time was a bug, and incorrect when cross-compiling. This
5945 change is known to cause breakage.
5946 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5947 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5948 1.10 and is now an error by default. It will become a hard error in the near
5950 * [The semantics relating modules to file system directories are changing in
5951 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5952 lint, which is a warning in this release, and will become a hard error in the
5954 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5955 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5956 the underlying iterator][37834]
5958 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5959 [33685]: https://github.com/rust-lang/rust/issues/33685
5960 [36868]: https://github.com/rust-lang/rust/pull/36868
5961 [37127]: https://github.com/rust-lang/rust/pull/37127
5962 [37229]: https://github.com/rust-lang/rust/pull/37229
5963 [37456]: https://github.com/rust-lang/rust/pull/37456
5964 [37527]: https://github.com/rust-lang/rust/pull/37527
5965 [37602]: https://github.com/rust-lang/rust/pull/37602
5966 [37613]: https://github.com/rust-lang/rust/pull/37613
5967 [37615]: https://github.com/rust-lang/rust/pull/37615
5968 [37636]: https://github.com/rust-lang/rust/pull/37636
5969 [37627]: https://github.com/rust-lang/rust/pull/37627
5970 [37642]: https://github.com/rust-lang/rust/pull/37642
5971 [37677]: https://github.com/rust-lang/rust/pull/37677
5972 [37699]: https://github.com/rust-lang/rust/pull/37699
5973 [37701]: https://github.com/rust-lang/rust/pull/37701
5974 [37705]: https://github.com/rust-lang/rust/pull/37705
5975 [37749]: https://github.com/rust-lang/rust/pull/37749
5976 [37760]: https://github.com/rust-lang/rust/pull/37760
5977 [37763]: https://github.com/rust-lang/rust/pull/37763
5978 [37764]: https://github.com/rust-lang/rust/pull/37764
5979 [37789]: https://github.com/rust-lang/rust/pull/37789
5980 [37791]: https://github.com/rust-lang/rust/pull/37791
5981 [37814]: https://github.com/rust-lang/rust/pull/37814
5982 [37817]: https://github.com/rust-lang/rust/pull/37817
5983 [37834]: https://github.com/rust-lang/rust/pull/37834
5984 [37848]: https://github.com/rust-lang/rust/pull/37848
5985 [37855]: https://github.com/rust-lang/rust/pull/37855
5986 [37882]: https://github.com/rust-lang/rust/pull/37882
5987 [37888]: https://github.com/rust-lang/rust/pull/37888
5988 [37973]: https://github.com/rust-lang/rust/pull/37973
5989 [37979]: https://github.com/rust-lang/rust/pull/37979
5990 [38086]: https://github.com/rust-lang/rust/pull/38086
5991 [38107]: https://github.com/rust-lang/rust/pull/38107
5992 [38117]: https://github.com/rust-lang/rust/pull/38117
5993 [38134]: https://github.com/rust-lang/rust/pull/38134
5994 [38146]: https://github.com/rust-lang/rust/pull/38146
5995 [38181]: https://github.com/rust-lang/rust/pull/38181
5996 [38182]: https://github.com/rust-lang/rust/pull/38182
5997 [38185]: https://github.com/rust-lang/rust/pull/38185
5998 [38192]: https://github.com/rust-lang/rust/pull/38192
5999 [38279]: https://github.com/rust-lang/rust/pull/38279
6000 [38835]: https://github.com/rust-lang/rust/pull/38835
6001 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6002 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6003 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6004 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6005 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6006 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6007 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6008 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6009 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6010 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6011 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6012 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6013 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6014 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6015 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6016 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6017 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6018 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6019 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6020 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6021 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6022 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6023 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6024 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6025 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6026 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6027 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6028 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6029 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6030 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6031 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6032 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6033 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6034 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6035 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6036 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6037 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6038 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6041 Version 1.14.0 (2016-12-22)
6042 ===========================
6047 * [`..` matches multiple tuple fields in enum variants, structs
6048 and tuples][36843]. [RFC 1492].
6049 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6050 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6051 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6052 dereferencing][36822]
6057 * [Mark enums with non-zero discriminant as non-zero][37224]
6058 * [Lower-case `static mut` names are linted like other
6059 statics and consts][37162]
6060 * [Fix ICE on some macros in const integer positions
6061 (e.g. `[u8; m!()]`)][36819]
6062 * [Improve error message and snippet for "did you mean `x`"][36798]
6063 * [Add a panic-strategy field to the target specification][36794]
6064 * [Include LLVM version in `--version --verbose`][37200]
6066 Compile-time Optimizations
6067 --------------------------
6069 * [Improve macro expansion performance][37569]
6070 * [Shrink `Expr_::ExprInlineAsm`][37445]
6071 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6072 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6073 * [Avoid more allocations when compiling html5ever][37373]
6074 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6075 * [Avoid some allocations in the macro parser][37318]
6076 * [Use a faster deflate setting][37298]
6077 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6078 during interning of slices][37270]
6079 * [Optimize `write_metadata`][37267]
6080 * [Don't process obligation forest cycles when stalled][37231]
6081 * [Avoid many `CrateConfig` clones][37161]
6082 * [Optimize `Substs::super_fold_with`][37108]
6083 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6084 * [Speed up `plug_leaks`][36917]
6089 * [`println!()`, with no arguments, prints newline][36825].
6090 Previously, an empty string was required to achieve the same.
6091 * [`Wrapping` impls standard binary and unary operators, as well as
6092 the `Sum` and `Product` iterators][37356]
6093 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6095 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6096 `VecDeque` iterators][37315]
6097 * [Improve `SipHasher` performance on small values][37312]
6098 * [Add Iterator trait TrustedLen to enable better FromIterator /
6100 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6101 * [`ReadDir` implements `Debug`][37221]
6102 * [Implement `RefUnwindSafe` for atomic types][37178]
6103 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6104 * [Avoid allocations in `Decoder::read_str`][37064]
6105 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6106 * [Impl `Debug` for raw pointers to unsized data][36880]
6107 * [Don't reuse `HashMap` random seeds][37470]
6108 * [The internal memory layout of `HashMap` is more cache-friendly, for
6109 significant improvements in some operations][36692]
6110 * [`HashMap` uses less memory on 32-bit architectures][36595]
6111 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6116 * [Expose rustc cfg values to build scripts][cargo/3243]
6117 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6118 * [Fix passing --features when testing multiple packages][cargo/3280]
6119 * [Use a single profile set per workspace][cargo/3249]
6120 * [Load `replace` sections from lock files][cargo/3220]
6121 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6126 * [rustup is the recommended Rust installation method][1.14rustup]
6127 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6128 S390x. These are [tier 2] platforms and may have major defects. Follow the
6129 instructions on the website to install, or add the targets to an existing
6130 installation with `rustup target add`. The new target triples are:
6131 - `mips-unknown-linux-gnu`
6132 - `mipsel-unknown-linux-gnu`
6133 - `mips64-unknown-linux-gnuabi64`
6134 - `mips64el-unknown-linux-gnuabi64 `
6135 - `powerpc-unknown-linux-gnu`
6136 - `powerpc64-unknown-linux-gnu`
6137 - `powerpc64le-unknown-linux-gnu`
6138 - `s390x-unknown-linux-gnu `
6139 * This release includes target (std) builds for ARM Linux running MUSL
6140 libc. These are [tier 2] platforms and may have major defects. Add the
6141 following triples to an existing rustup installation with `rustup target add`:
6142 - `arm-unknown-linux-musleabi`
6143 - `arm-unknown-linux-musleabihf`
6144 - `armv7-unknown-linux-musleabihf`
6145 * This release includes [experimental support for WebAssembly][1.14wasm], via
6146 the `wasm32-unknown-emscripten` target. This target is known to have major
6147 defects. Please test, report, and fix.
6148 * rustup no longer installs documentation by default. Run `rustup
6149 component add rust-docs` to install.
6150 * [Fix line stepping in debugger][37310]
6151 * [Enable line number debuginfo in releases][37280]
6156 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6157 * [Add support for Fuchsia OS][37313]
6158 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6163 * [A number of forward-compatibility lints used by the compiler
6164 to gradually introduce language changes have been converted
6165 to deny by default][36894]:
6166 - ["use of inaccessible extern crate erroneously allowed"][36886]
6167 - ["type parameter default erroneously allowed in invalid location"][36887]
6168 - ["detects super or self keywords at the beginning of global path"][36888]
6169 - ["two overlapping inherent impls define an item with the same name
6170 were erroneously allowed"][36889]
6171 - ["floating-point constants cannot be used in patterns"][36890]
6172 - ["constants of struct or enum type can only be used in a pattern if
6173 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6174 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6175 * [Prohibit patterns in trait methods without bodies][37378]
6176 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6177 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6178 * [The `$crate` macro variable is accepted in fewer locations][37213]
6179 * [Impls specifying extra region requirements beyond the trait
6180 they implement are rejected][37167]
6181 * [Enums may not be unsized][37111]. Unsized enums are intended to
6182 work but never have. For now they are forbidden.
6183 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6185 [tier 2]: https://forge.rust-lang.org/platform-support.html
6186 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6187 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6188 [36430]: https://github.com/rust-lang/rust/pull/36430
6189 [36595]: https://github.com/rust-lang/rust/pull/36595
6190 [36595]: https://github.com/rust-lang/rust/pull/36595
6191 [36692]: https://github.com/rust-lang/rust/pull/36692
6192 [36767]: https://github.com/rust-lang/rust/pull/36767
6193 [36794]: https://github.com/rust-lang/rust/pull/36794
6194 [36798]: https://github.com/rust-lang/rust/pull/36798
6195 [36819]: https://github.com/rust-lang/rust/pull/36819
6196 [36822]: https://github.com/rust-lang/rust/pull/36822
6197 [36825]: https://github.com/rust-lang/rust/pull/36825
6198 [36843]: https://github.com/rust-lang/rust/pull/36843
6199 [36880]: https://github.com/rust-lang/rust/pull/36880
6200 [36886]: https://github.com/rust-lang/rust/issues/36886
6201 [36887]: https://github.com/rust-lang/rust/issues/36887
6202 [36888]: https://github.com/rust-lang/rust/issues/36888
6203 [36889]: https://github.com/rust-lang/rust/issues/36889
6204 [36890]: https://github.com/rust-lang/rust/issues/36890
6205 [36891]: https://github.com/rust-lang/rust/issues/36891
6206 [36892]: https://github.com/rust-lang/rust/issues/36892
6207 [36894]: https://github.com/rust-lang/rust/pull/36894
6208 [36917]: https://github.com/rust-lang/rust/pull/36917
6209 [36993]: https://github.com/rust-lang/rust/pull/36993
6210 [37037]: https://github.com/rust-lang/rust/pull/37037
6211 [37064]: https://github.com/rust-lang/rust/pull/37064
6212 [37094]: https://github.com/rust-lang/rust/pull/37094
6213 [37108]: https://github.com/rust-lang/rust/pull/37108
6214 [37111]: https://github.com/rust-lang/rust/pull/37111
6215 [37161]: https://github.com/rust-lang/rust/pull/37161
6216 [37162]: https://github.com/rust-lang/rust/pull/37162
6217 [37167]: https://github.com/rust-lang/rust/pull/37167
6218 [37178]: https://github.com/rust-lang/rust/pull/37178
6219 [37200]: https://github.com/rust-lang/rust/pull/37200
6220 [37213]: https://github.com/rust-lang/rust/pull/37213
6221 [37221]: https://github.com/rust-lang/rust/pull/37221
6222 [37224]: https://github.com/rust-lang/rust/pull/37224
6223 [37230]: https://github.com/rust-lang/rust/pull/37230
6224 [37231]: https://github.com/rust-lang/rust/pull/37231
6225 [37247]: https://github.com/rust-lang/rust/pull/37247
6226 [37267]: https://github.com/rust-lang/rust/pull/37267
6227 [37270]: https://github.com/rust-lang/rust/pull/37270
6228 [37273]: https://github.com/rust-lang/rust/pull/37273
6229 [37280]: https://github.com/rust-lang/rust/pull/37280
6230 [37298]: https://github.com/rust-lang/rust/pull/37298
6231 [37306]: https://github.com/rust-lang/rust/pull/37306
6232 [37310]: https://github.com/rust-lang/rust/pull/37310
6233 [37312]: https://github.com/rust-lang/rust/pull/37312
6234 [37313]: https://github.com/rust-lang/rust/pull/37313
6235 [37315]: https://github.com/rust-lang/rust/pull/37315
6236 [37318]: https://github.com/rust-lang/rust/pull/37318
6237 [37322]: https://github.com/rust-lang/rust/pull/37322
6238 [37326]: https://github.com/rust-lang/rust/pull/37326
6239 [37351]: https://github.com/rust-lang/rust/pull/37351
6240 [37356]: https://github.com/rust-lang/rust/pull/37356
6241 [37367]: https://github.com/rust-lang/rust/pull/37367
6242 [37373]: https://github.com/rust-lang/rust/pull/37373
6243 [37378]: https://github.com/rust-lang/rust/pull/37378
6244 [37389]: https://github.com/rust-lang/rust/pull/37389
6245 [37392]: https://github.com/rust-lang/rust/pull/37392
6246 [37427]: https://github.com/rust-lang/rust/pull/37427
6247 [37439]: https://github.com/rust-lang/rust/pull/37439
6248 [37445]: https://github.com/rust-lang/rust/pull/37445
6249 [37470]: https://github.com/rust-lang/rust/pull/37470
6250 [37569]: https://github.com/rust-lang/rust/pull/37569
6251 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6252 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6253 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6254 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6255 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6256 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6257 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6260 Version 1.13.0 (2016-11-10)
6261 ===========================
6266 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6267 errors, like the `try!` macro, described in [RFC 0243].
6268 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6269 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6270 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6271 * [Fix lifetime rules for 'if' conditions][36029]
6272 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6277 * [Add the `-C link-arg` argument][36574]
6278 * [Remove the old AST-based backend from rustc_trans][35764]
6279 * [Don't enable NEON by default on armv7 Linux][35814]
6280 * [Fix debug line number info for macro expansions][35238]
6281 * [Do not emit "class method" debuginfo for types that are not
6282 DICompositeType][36008]
6283 * [Warn about multiple conflicting #[repr] hints][34623]
6284 * [When sizing DST, don't double-count nested struct prefixes][36351]
6285 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6286 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6287 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6288 * [Expand macros without recursing to avoid stack overflows][36214]
6293 * [Replace macro backtraces with labeled local uses][35702]
6294 * [Improve error message for misplaced doc comments][33922]
6295 * [Buffer unix and lock windows to prevent message interleaving][35975]
6296 * [Update lifetime errors to specifically note temporaries][36171]
6297 * [Special case a few colors for Windows][36178]
6298 * [Suggest `use self` when such an import resolves][36289]
6299 * [Be more specific when type parameter shadows primitive type][36338]
6300 * Many minor improvements
6302 Compile-time Optimizations
6303 --------------------------
6305 * [Compute and cache HIR hashes at beginning][35854]
6306 * [Don't hash types in loan paths][36004]
6307 * [Cache projections in trans][35761]
6308 * [Optimize the parser's last token handling][36527]
6309 * [Only instantiate #[inline] functions in codegen units referencing
6310 them][36524]. This leads to big improvements in cases where crates export
6311 define many inline functions without using them directly.
6312 * [Lazily allocate TypedArena's first chunk][36592]
6313 * [Don't allocate during default HashSet creation][36734]
6320 * [`overflowing_abs`]
6321 * [`RefCell::try_borrow`]
6322 * [`RefCell::try_borrow_mut`]
6327 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6328 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6330 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6331 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6332 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6333 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6334 * [Use arc4rand on FreeBSD][35884]
6335 * [memrchr: Correct aligned offset computation][35969]
6336 * [Improve Demangling of Rust Symbols][36059]
6337 * [Use monotonic time in condition variables][35048]
6338 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6339 * [Implement conversion traits for `char`][35755]
6340 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6341 * [Zero first byte of CString on drop][36264]
6342 * [Inherit overflow checks for sum and product][36372]
6343 * [Add missing Eq implementations][36423]
6344 * [Implement `Debug` for `DirEntry`][36631]
6345 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6347 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6348 * [Implement more traits for `std::io::ErrorKind`][35911]
6349 * [Optimize BinaryHeap bounds checking][36072]
6350 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6351 `extend_with_element`][36355]
6352 * [Fix overflow checking in unsigned pow()][34942]
6357 * This release includes security fixes to both curl and OpenSSL.
6358 * [Fix transitive doctests when panic=abort][cargo/3021]
6359 * [Add --all-features flag to cargo][cargo/3038]
6360 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6361 * [Don't parse the home directory more than once][cargo/3078]
6362 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6363 * [Update OpenSSL to 1.0.2j][cargo/3121]
6364 * [Add license and license_file to cargo metadata output][cargo/3110]
6365 * [Make crates-io registry URL optional in config; ignore all changes to
6366 source.crates-io][cargo/3089]
6367 * [Don't download dependencies from other platforms][cargo/3123]
6368 * [Build transitive dev-dependencies when needed][cargo/3125]
6369 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6370 * [Avoid updating registry when adding existing deps][cargo/3144]
6371 * [Warn about path overrides that won't work][cargo/3136]
6372 * [Use workspaces during `cargo install`][cargo/3146]
6373 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6374 * [Add --message-format flag][cargo/3000]
6375 * [Pass target environment for rustdoc][cargo/3205]
6376 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6377 * [Update curl and curl-sys][cargo/3241]
6378 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6383 * [rustdoc: Add the `--sysroot` argument][36586]
6384 * [rustdoc: Fix a couple of issues with the search results][35655]
6385 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6386 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6387 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6392 * [Remove unmaintained style guide][35124]
6393 * [Add s390x support][36369]
6394 * [Initial work at Haiku OS support][36727]
6395 * [Add mips-uclibc targets][35734]
6396 * [Crate-ify compiler-rt into compiler-builtins][35021]
6397 * [Add rustc version info (git hash + date) to dist tarball][36213]
6398 * Many documentation improvements
6403 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6404 * [Deny (by default) transmuting from fn item types to pointer-sized
6405 types][34923]. Continuing the long transition to zero-sized fn items,
6407 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6409 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6410 * [Fix lifetime rules for 'if' conditions][36029].
6411 * [Inherit overflow checks for sum and product][36372].
6412 * [Forbid user-defined macros named "macro_rules"][36730].
6414 [33922]: https://github.com/rust-lang/rust/pull/33922
6415 [34623]: https://github.com/rust-lang/rust/pull/34623
6416 [34923]: https://github.com/rust-lang/rust/pull/34923
6417 [34942]: https://github.com/rust-lang/rust/pull/34942
6418 [34982]: https://github.com/rust-lang/rust/pull/34982
6419 [35021]: https://github.com/rust-lang/rust/pull/35021
6420 [35048]: https://github.com/rust-lang/rust/pull/35048
6421 [35074]: https://github.com/rust-lang/rust/pull/35074
6422 [35124]: https://github.com/rust-lang/rust/pull/35124
6423 [35234]: https://github.com/rust-lang/rust/pull/35234
6424 [35238]: https://github.com/rust-lang/rust/pull/35238
6425 [35354]: https://github.com/rust-lang/rust/pull/35354
6426 [35559]: https://github.com/rust-lang/rust/pull/35559
6427 [35585]: https://github.com/rust-lang/rust/pull/35585
6428 [35627]: https://github.com/rust-lang/rust/pull/35627
6429 [35655]: https://github.com/rust-lang/rust/pull/35655
6430 [35702]: https://github.com/rust-lang/rust/pull/35702
6431 [35707]: https://github.com/rust-lang/rust/pull/35707
6432 [35728]: https://github.com/rust-lang/rust/pull/35728
6433 [35734]: https://github.com/rust-lang/rust/pull/35734
6434 [35755]: https://github.com/rust-lang/rust/pull/35755
6435 [35761]: https://github.com/rust-lang/rust/pull/35761
6436 [35764]: https://github.com/rust-lang/rust/pull/35764
6437 [35814]: https://github.com/rust-lang/rust/pull/35814
6438 [35854]: https://github.com/rust-lang/rust/pull/35854
6439 [35871]: https://github.com/rust-lang/rust/pull/35871
6440 [35884]: https://github.com/rust-lang/rust/pull/35884
6441 [35911]: https://github.com/rust-lang/rust/pull/35911
6442 [35969]: https://github.com/rust-lang/rust/pull/35969
6443 [35975]: https://github.com/rust-lang/rust/pull/35975
6444 [36004]: https://github.com/rust-lang/rust/pull/36004
6445 [36008]: https://github.com/rust-lang/rust/pull/36008
6446 [36014]: https://github.com/rust-lang/rust/pull/36014
6447 [36029]: https://github.com/rust-lang/rust/pull/36029
6448 [36059]: https://github.com/rust-lang/rust/pull/36059
6449 [36072]: https://github.com/rust-lang/rust/pull/36072
6450 [36101]: https://github.com/rust-lang/rust/pull/36101
6451 [36104]: https://github.com/rust-lang/rust/pull/36104
6452 [36171]: https://github.com/rust-lang/rust/pull/36171
6453 [36173]: https://github.com/rust-lang/rust/pull/36173
6454 [36178]: https://github.com/rust-lang/rust/pull/36178
6455 [36213]: https://github.com/rust-lang/rust/pull/36213
6456 [36214]: https://github.com/rust-lang/rust/pull/36214
6457 [36264]: https://github.com/rust-lang/rust/pull/36264
6458 [36266]: https://github.com/rust-lang/rust/pull/36266
6459 [36289]: https://github.com/rust-lang/rust/pull/36289
6460 [36338]: https://github.com/rust-lang/rust/pull/36338
6461 [36351]: https://github.com/rust-lang/rust/pull/36351
6462 [36355]: https://github.com/rust-lang/rust/pull/36355
6463 [36369]: https://github.com/rust-lang/rust/pull/36369
6464 [36372]: https://github.com/rust-lang/rust/pull/36372
6465 [36423]: https://github.com/rust-lang/rust/pull/36423
6466 [36482]: https://github.com/rust-lang/rust/pull/36482
6467 [36505]: https://github.com/rust-lang/rust/pull/36505
6468 [36524]: https://github.com/rust-lang/rust/pull/36524
6469 [36527]: https://github.com/rust-lang/rust/pull/36527
6470 [36551]: https://github.com/rust-lang/rust/pull/36551
6471 [36574]: https://github.com/rust-lang/rust/pull/36574
6472 [36586]: https://github.com/rust-lang/rust/pull/36586
6473 [36592]: https://github.com/rust-lang/rust/pull/36592
6474 [36631]: https://github.com/rust-lang/rust/pull/36631
6475 [36639]: https://github.com/rust-lang/rust/pull/36639
6476 [36721]: https://github.com/rust-lang/rust/pull/36721
6477 [36727]: https://github.com/rust-lang/rust/pull/36727
6478 [36730]: https://github.com/rust-lang/rust/pull/36730
6479 [36734]: https://github.com/rust-lang/rust/pull/36734
6480 [36754]: https://github.com/rust-lang/rust/pull/36754
6481 [36995]: https://github.com/rust-lang/rust/pull/36995
6482 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6483 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6484 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6485 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6486 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6487 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6488 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6489 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6490 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6491 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6492 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6493 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6494 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6495 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6496 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6497 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6498 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6499 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6500 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6501 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6502 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6503 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6504 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6505 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6506 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6507 [rustup]: https://www.rustup.rs
6508 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6509 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6510 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6511 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6512 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6513 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6514 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6517 Version 1.12.1 (2016-10-20)
6518 ===========================
6523 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6524 * [Confusion with double negation and booleans][36856]
6525 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6526 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6527 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6528 * [Corrupted memory after updated to 1.12][36936]
6529 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6530 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6531 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6533 [36381]: https://github.com/rust-lang/rust/issues/36381
6534 [36856]: https://github.com/rust-lang/rust/issues/36856
6535 [36875]: https://github.com/rust-lang/rust/issues/36875
6536 [36924]: https://github.com/rust-lang/rust/issues/36924
6537 [36926]: https://github.com/rust-lang/rust/issues/36926
6538 [36936]: https://github.com/rust-lang/rust/issues/36936
6539 [37026]: https://github.com/rust-lang/rust/issues/37026
6540 [37112]: https://github.com/rust-lang/rust/issues/37112
6541 [37153]: https://github.com/rust-lang/rust/issues/37153
6544 Version 1.12.0 (2016-09-29)
6545 ===========================
6550 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6551 This translation pass is far simpler than the previous AST->LLVM pass, and
6552 creates opportunities to perform new optimizations directly on the MIR. It
6553 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6554 * [`rustc` presents a new, more readable error format, along with
6555 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6556 Most common editors supporting Rust have been updated to work with it. It was
6557 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6562 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6563 This translation pass is far simpler than the previous AST->LLVM pass, and
6564 creates opportunities to perform new optimizations directly on the MIR. It
6565 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6566 * [Print the Rust target name, not the LLVM target name, with
6567 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6568 * [The computation of `TypeId` is correct in some cases where it was previously
6569 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6570 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6571 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6572 `--print relocation-models`, and `--print code-models` print the available
6573 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6574 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6575 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6576 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6577 These targets produce statically-linked binaries. There are no binary release
6583 * [`rustc` presents a new, more readable error format, along with
6584 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6585 Most common editors supporting Rust have been updated to work with it. It was
6586 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6587 * [In error descriptions, references are now described in plain English,
6588 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6589 * [In error type descriptions, unknown numeric types are named `{integer}` or
6590 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6591 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6596 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6597 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6598 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6599 useful](https://github.com/rust-lang/rust/pull/34908)
6600 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6601 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6602 * [Semicolons are properly required as statement delimiters inside
6603 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6604 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6609 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6610 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6611 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6612 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6613 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6614 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6615 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6616 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6617 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6618 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6619 Both on Unix and Windows.
6620 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6621 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6622 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6623 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6624 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6625 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6626 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6627 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6632 * [The `format!` macro and friends now allow a single argument to be formatted
6633 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6634 * [The lifetime bounds on `[T]::binary_search_by` and
6635 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6636 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6637 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6638 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6639 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6640 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6641 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6642 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6643 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6644 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6645 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6646 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6647 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6648 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6649 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6650 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6651 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6652 * [`mpsc::sync_channel` `Receiver`s return any available message before
6653 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6654 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6655 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6660 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6661 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6662 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6663 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6664 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6665 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6666 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6667 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6668 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6669 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6670 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6671 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6672 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6673 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6674 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6675 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6680 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6681 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6686 * [Test binaries now support a `--test-threads` argument to specify the number
6687 of threads used to run tests, and which acts the same as the
6688 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6689 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6690 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6691 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6692 * [Rust releases now come with source packages that can be installed by rustup
6693 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6694 The resulting source code can be used by tools and IDES, located in the
6695 sysroot under `lib/rustlib/src`.
6700 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6701 * Many minor improvements to the documentation.
6702 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6707 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6708 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6709 * [When formatting strings, if "precision" is specified, the "fill",
6710 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6711 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6714 Version 1.11.0 (2016-08-18)
6715 ===========================
6720 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6721 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6722 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6723 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6728 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6729 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6730 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6731 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6732 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6733 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6734 (in libcore - previously stabilized in libstd)
6735 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6736 (in libcore - previously stabilized in libstd)
6737 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6738 (in libcore - previously stabilized in libstd)
6739 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6740 (in libcore - previously stabilized in libstd)
6741 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6742 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6743 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6744 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6749 * [The `thread_local!` macro supports multiple definitions in a single
6750 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6751 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6752 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6753 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6754 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6755 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6756 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6757 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6762 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6763 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6764 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6765 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6766 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6767 and `-vv` prints warnings for all crates.
6768 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6769 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6770 This provides room for expansion by arbitrary tools.
6771 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6772 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6773 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6774 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6775 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6776 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6777 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6782 * [Caching projections speeds up type check dramatically for some
6783 workloads](https://github.com/rust-lang/rust/pull/33816)
6784 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6785 This hasher is faster, but is believed to provide sufficient
6786 protection from collision attacks.
6787 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6792 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6793 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6794 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6795 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6796 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6801 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6802 * [When emitting debug info, rustc emits frame pointers for closures,
6803 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6804 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6805 * Many more errors have been given error codes and extended
6807 * API documentation continues to be improved, with many new examples
6812 * [rustc no longer hangs when dependencies recursively re-export
6813 submodules](https://github.com/rust-lang/rust/pull/34542)
6814 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6815 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6816 rewritten](https://github.com/rust-lang/rust/pull/33895)
6817 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6818 No targets use this yet, but it works toward AVR support.
6823 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6824 * [The new follow-set rules that place restrictions on `macro_rules!`
6825 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6826 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6827 and has been a warning since 1.10.
6828 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6829 This causes breakage in some corner cases.
6832 Version 1.10.0 (2016-07-07)
6833 ===========================
6838 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6839 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6840 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6841 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6842 * [`panic!` can be converted to a runtime abort with the
6843 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6844 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6845 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6846 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6847 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6848 Note that Cargo does not yet directly support cdylibs.
6853 * `os::windows::fs::OpenOptionsExt::access_mode`
6854 * `os::windows::fs::OpenOptionsExt::share_mode`
6855 * `os::windows::fs::OpenOptionsExt::custom_flags`
6856 * `os::windows::fs::OpenOptionsExt::attributes`
6857 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6858 * `os::unix::fs::OpenOptionsExt::custom_flags`
6859 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6860 * `Default for sync::Weak`
6861 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6862 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6863 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6864 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6865 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6866 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6867 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6868 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6869 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6870 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6871 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6872 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6873 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6874 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6875 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6876 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6877 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6878 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6879 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6880 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6881 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6882 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6883 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6884 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6885 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6886 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6887 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6888 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6889 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6890 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6891 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6892 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6893 * Read/Write/RawFd impls for `UnixStream`
6894 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6895 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6896 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6897 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6898 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6899 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6900 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6901 * RawFd impls for `UnixListener`
6902 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6903 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6904 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6905 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6906 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6907 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6908 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6909 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6910 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6911 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6912 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6913 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6914 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6915 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6916 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6917 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6918 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6919 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6920 * RawFd impls for `UnixDatagram`
6921 * `{BTree,Hash}Map::values_mut`
6922 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6927 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6928 The semantics of this minor method are subtle and probably not what
6930 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6931 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6932 will fall back to `/dev/urandom` temporarily to avoid blocking
6933 during early boot](https://github.com/rust-lang/rust/pull/33086).
6934 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6935 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6936 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6937 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6938 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6939 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6940 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6944 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6945 This controls the runtime behavior of the `panic!` macro
6946 and can be either "unwind" (the default), or "abort".
6947 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6948 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6949 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6950 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6951 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6952 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6953 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6954 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6955 By default they are retried twice, which can be customized with the
6956 `net.retry` value in `.cargo/config`.
6957 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6958 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6959 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6960 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6961 Makes it possible to install multiple crates in parallel.
6962 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6963 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6964 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6965 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6966 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6967 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6972 * [rustc memory usage was reduced by refactoring the context used for
6973 type checking](https://github.com/rust-lang/rust/pull/33425).
6974 * [Speed up creation of `HashMap`s by caching the random keys used
6975 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6976 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6977 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6978 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6979 10x faster than the previous lookup tables.
6980 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6985 * Many incremental improvements to documentation and rustdoc.
6986 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6987 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6988 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6989 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6990 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6991 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6992 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6997 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6998 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6999 * [`std` no longer prints backtraces on platforms where the running
7000 module must be loaded with `env::current_exe`, which can't be relied
7001 on](https://github.com/rust-lang/rust/pull/33554).
7002 * This release includes std binaries for the i586-unknown-linux-gnu,
7003 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7004 i586 target is for old x86 hardware without SSE2, and the armv7
7005 target is for Android running on modern ARM architectures.
7006 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7007 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7008 * [On Unix the runtime aborts by calling `libc::abort` instead of
7009 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7010 * [Rust is now bootstrapped from the previous release of Rust,
7011 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7016 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7017 * [`target_env` for Linux ARM targets is just `gnu`, not
7018 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7019 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7020 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7021 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7022 Affects how macros are parsed.
7023 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7024 * [Feature-gated attributes on macro-generated macro invocations are
7025 now rejected](https://github.com/rust-lang/rust/pull/32791).
7026 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7027 This caused some minor changes to type inference.
7030 Version 1.9.0 (2016-05-26)
7031 ==========================
7036 * The `#[deprecated]` attribute when applied to an API will generate
7037 warnings when used. The warnings may be suppressed with
7038 `#[allow(deprecated)]`. [RFC 1270].
7039 * [`fn` item types are zero sized, and each `fn` names a unique
7040 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7041 `transmute` on a `fn` type will generate a warning for a few cycles,
7042 then will be converted to an error.
7043 * [Field and method resolution understand visibility, so private
7044 fields and methods cannot prevent the proper use of public fields
7045 and methods][1.9fv].
7046 * [The parser considers unicode codepoints in the
7047 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7053 * [`std::panic::catch_unwind`] (renamed from `recover`)
7054 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7055 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7056 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7057 * [`str::is_char_boundary`]
7058 * [`<*const T>::as_ref`]
7059 * [`<*mut T>::as_ref`]
7060 * [`<*mut T>::as_mut`]
7061 * [`AsciiExt::make_ascii_uppercase`]
7062 * [`AsciiExt::make_ascii_lowercase`]
7063 * [`char::decode_utf16`]
7064 * [`char::DecodeUtf16`]
7065 * [`char::DecodeUtf16Error`]
7066 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7067 * [`BTreeSet::take`]
7068 * [`BTreeSet::replace`]
7071 * [`HashSet::replace`]
7073 * [`OsString::with_capacity`]
7074 * [`OsString::clear`]
7075 * [`OsString::capacity`]
7076 * [`OsString::reserve`]
7077 * [`OsString::reserve_exact`]
7078 * [`OsStr::is_empty`]
7080 * [`std::os::unix::thread`]
7083 * [`JoinHandleExt::as_pthread_t`]
7084 * [`JoinHandleExt::into_pthread_t`]
7085 * [`HashSet::hasher`]
7086 * [`HashMap::hasher`]
7087 * [`CommandExt::exec`]
7088 * [`File::try_clone`]
7089 * [`SocketAddr::set_ip`]
7090 * [`SocketAddr::set_port`]
7091 * [`SocketAddrV4::set_ip`]
7092 * [`SocketAddrV4::set_port`]
7093 * [`SocketAddrV6::set_ip`]
7094 * [`SocketAddrV6::set_port`]
7095 * [`SocketAddrV6::set_flowinfo`]
7096 * [`SocketAddrV6::set_scope_id`]
7097 * [`slice::copy_from_slice`]
7098 * [`ptr::read_volatile`]
7099 * [`ptr::write_volatile`]
7100 * [`OpenOptions::create_new`]
7101 * [`TcpStream::set_nodelay`]
7102 * [`TcpStream::nodelay`]
7103 * [`TcpStream::set_ttl`]
7104 * [`TcpStream::ttl`]
7105 * [`TcpStream::set_only_v6`]
7106 * [`TcpStream::only_v6`]
7107 * [`TcpStream::take_error`]
7108 * [`TcpStream::set_nonblocking`]
7109 * [`TcpListener::set_ttl`]
7110 * [`TcpListener::ttl`]
7111 * [`TcpListener::set_only_v6`]
7112 * [`TcpListener::only_v6`]
7113 * [`TcpListener::take_error`]
7114 * [`TcpListener::set_nonblocking`]
7115 * [`UdpSocket::set_broadcast`]
7116 * [`UdpSocket::broadcast`]
7117 * [`UdpSocket::set_multicast_loop_v4`]
7118 * [`UdpSocket::multicast_loop_v4`]
7119 * [`UdpSocket::set_multicast_ttl_v4`]
7120 * [`UdpSocket::multicast_ttl_v4`]
7121 * [`UdpSocket::set_multicast_loop_v6`]
7122 * [`UdpSocket::multicast_loop_v6`]
7123 * [`UdpSocket::set_multicast_ttl_v6`]
7124 * [`UdpSocket::multicast_ttl_v6`]
7125 * [`UdpSocket::set_ttl`]
7126 * [`UdpSocket::ttl`]
7127 * [`UdpSocket::set_only_v6`]
7128 * [`UdpSocket::only_v6`]
7129 * [`UdpSocket::join_multicast_v4`]
7130 * [`UdpSocket::join_multicast_v6`]
7131 * [`UdpSocket::leave_multicast_v4`]
7132 * [`UdpSocket::leave_multicast_v6`]
7133 * [`UdpSocket::take_error`]
7134 * [`UdpSocket::connect`]
7135 * [`UdpSocket::send`]
7136 * [`UdpSocket::recv`]
7137 * [`UdpSocket::set_nonblocking`]
7142 * [`std::sync::Once` is poisoned if its initialization function
7144 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7145 * [Most types implement `fmt::Debug`][1.9db].
7146 * [The default buffer size used by `BufReader` and `BufWriter` was
7147 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7148 used by other languages.
7149 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7150 `Duration` additionally implements `*=` and `/=`][1.9ta].
7151 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7152 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7153 * [`Chain` implements `BufRead`][1.9ch].
7154 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7159 * [Cargo can now run concurrently][1.9cc].
7160 * [Top-level overrides allow specific revisions of crates to be
7161 overridden through the entire crate graph][1.9ct]. This is intended
7162 to make upgrades easier for large projects, by allowing crates to be
7163 forked temporarily until they've been upgraded and republished.
7164 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7165 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7166 on the commandline][1.9cf]. `rustc` arguments can also be specified
7167 in the `build.rustflags` configuration key.
7172 * [The time complexity of comparing variables for equivalence during type
7173 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7174 to major compilation time improvement in some scenarios.
7175 * [`ToString` is specialized for `str`, giving it the same performance
7176 as `to_owned`][1.9ts].
7177 * [Spawning processes with `Command::output` no longer creates extra
7179 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7180 for C-like enums][1.9cl].
7185 * [Passing the `--quiet` flag to a test runner will produce
7186 much-abbreviated output][1.9q].
7187 * The Rust Project now publishes std binaries for the
7188 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7189 `i586-pc-windows-msvc` targets.
7194 * [`std::sync::Once` is poisoned if its initialization function
7196 * [It is illegal to define methods with the same name in overlapping
7197 inherent `impl` blocks][1.9sn].
7198 * [`fn` item types are zero sized, and each `fn` names a unique
7199 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7200 `transmute` on a `fn` type will generate a warning for a few cycles,
7201 then will be converted to an error.
7202 * [Improvements to const evaluation may trigger new errors when integer
7203 literals are out of range][1.9ce].
7206 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7207 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7208 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7209 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7210 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7211 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7212 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7213 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7214 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7215 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7216 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7217 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7218 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7219 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7220 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7221 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7222 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7223 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7224 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7225 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7226 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7227 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7228 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7229 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7230 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7231 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7232 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7233 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7234 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7235 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7236 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7237 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7238 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7239 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7240 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7241 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7242 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7243 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7244 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7245 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7246 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7247 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7248 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7249 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7250 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7251 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7252 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7253 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7254 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7255 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7256 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7257 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7258 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7259 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7260 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7261 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7262 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7263 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7264 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7265 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7266 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7267 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7268 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7269 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7270 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7271 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7272 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7273 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7274 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7275 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7276 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7277 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7278 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7279 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7280 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7281 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7282 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7283 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7284 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7285 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7286 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7287 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7288 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7289 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7290 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7291 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7292 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7293 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7294 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7295 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7296 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7297 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7298 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7299 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7300 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7301 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7302 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7303 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7304 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7305 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7306 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7307 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7308 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7309 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7310 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7311 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7312 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7313 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7314 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7315 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7318 Version 1.8.0 (2016-04-14)
7319 ==========================
7324 * Rust supports overloading of compound assignment statements like
7325 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7326 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7327 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7329 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7330 addition to the non-braced form, `struct Foo;`. [RFC 218].
7336 * [`str::encode_utf16`] (renamed from `utf16_units`)
7337 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7340 * [`ptr::drop_in_place`]
7342 * [`time::SystemTime`]
7344 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7345 * [`Instant::elapsed`]
7346 * [`SystemTime::now`]
7347 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7348 * [`SystemTime::elapsed`]
7349 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7350 * [`SystemTimeError`]
7351 * [`SystemTimeError::duration`]
7352 * Various impls for `SystemTimeError`
7354 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7355 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7356 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7357 * [The `write!` and `writeln!` macros correctly emit errors if any of
7358 their arguments can't be formatted][1.8w].
7359 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7360 * [The Unix-specific `raw` modules, which contain a number of
7361 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7362 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7363 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7364 across platforms was making it difficult to implement `std`
7365 correctly. Those that need these definitions should use the `libc`
7367 * The Unix-specific `MetadataExt` traits, including
7368 `os::unix::fs::MetadataExt`, which expose values such as inode
7369 numbers [no longer return platform-specific types][1.8r], but
7370 instead return widened integers. [RFC 1415].
7371 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7372 * [Atomic loads and stores are not volatile][1.8a].
7373 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7378 * [Inlining hash functions lead to a 3% compile-time improvement in
7379 some workloads][1.8h].
7380 * When using jemalloc, its symbols are [unprefixed so that it
7381 overrides the libc malloc implementation][1.8h]. This means that for
7382 rustc, LLVM is now using jemalloc, which results in a 6%
7383 compile-time improvement on a specific workload.
7384 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7389 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7390 i686-pc-windows-msvc is now considered a tier-1 platform.
7391 * [The `--print targets` flag prints a list of supported targets][1.8t].
7392 * [The `--print cfg` flag prints the `cfg`s defined for the current
7394 * [`rustc` can be built with an new Cargo-based build system, written
7395 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7396 build system. To enable it configure with `configure --rustbuild`.
7397 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7398 variants while also indicating the total number of missing variants
7399 if more than 3][1.8m].
7400 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7401 * The Rust Project now publishes binary releases of the standard
7402 library for a number of tier-2 targets:
7403 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7404 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7405 `x86_64-rumprun-netbsd`. These can be installed with
7406 tools such as [multirust][1.8mr].
7411 * [`cargo init` creates a new Cargo project in the current
7412 directory][1.8ci]. It is otherwise like `cargo new`.
7413 * [Cargo has configuration keys for `-v` and
7414 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7415 `[term]` section of `.cargo/config`.
7416 * [Configuration keys that evaluate to strings or integers can be set
7417 via environment variables][1.8ce]. For example the `build.jobs` key
7418 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7419 precedence over config files.
7420 * [Target-specific dependencies support Rust `cfg` syntax for
7421 describing targets][1.8cfg] so that dependencies for multiple
7422 targets can be specified together. [RFC 1361].
7423 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7424 `RUSTDOC` take precedence over the `build.target-dir`,
7425 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7426 * [The child process tree is killed on Windows when Cargo is
7428 * [The `build.target` configuration value sets the target platform,
7429 like `--target`][1.8ct].
7434 * [Unstable compiler flags have been further restricted][1.8u]. Since
7435 1.0 `-Z` flags have been considered unstable, and other flags that
7436 were considered unstable additionally required passing `-Z
7437 unstable-options` to access. Unlike unstable language and library
7438 features though, these options have been accessible on the stable
7439 release channel. Going forward, *new unstable flags will not be
7440 available on the stable release channel*, and old unstable flags
7441 will warn about their usage. In the future, all unstable flags will
7442 be unavailable on the stable release channel.
7443 * [It is no longer possible to `match` on empty enum variants using
7444 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7445 * The Unix-specific `MetadataExt` traits, including
7446 `os::unix::fs::MetadataExt`, which expose values such as inode
7447 numbers [no longer return platform-specific types][1.8r], but
7448 instead return widened integers. [RFC 1415].
7449 * [Modules sourced from the filesystem cannot appear within arbitrary
7450 blocks, but only within other modules][1.8mf].
7451 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7452 * On Unix, [stack overflow triggers a runtime abort instead of a
7454 * [`Command::spawn` and its equivalents return an error if any of
7455 its command-line arguments contain interior `NUL`s][1.8n].
7456 * [Tuple and unit enum variants from other crates are in the type
7458 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7459 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7460 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7461 instead of `foo.lib`.
7464 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7465 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7466 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7467 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7468 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7469 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7470 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7471 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7472 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7473 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7474 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7475 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7476 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7477 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7478 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7479 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7480 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7481 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7482 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7483 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7484 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7485 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7486 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7487 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7488 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7489 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7490 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7491 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7492 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7493 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7494 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7495 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7496 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7497 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7498 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7499 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7500 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7501 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7502 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7503 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7504 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7505 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7506 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7507 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7508 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7509 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7510 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7511 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7512 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7513 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7514 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7515 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7516 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7517 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7518 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7519 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7520 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7521 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7522 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7523 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7526 Version 1.7.0 (2016-03-03)
7527 ==========================
7534 * [`Path::strip_prefix`] (renamed from relative_from)
7535 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7537 * [`Ipv4Addr::is_loopback`]
7538 * [`Ipv4Addr::is_private`]
7539 * [`Ipv4Addr::is_link_local`]
7540 * [`Ipv4Addr::is_multicast`]
7541 * [`Ipv4Addr::is_broadcast`]
7542 * [`Ipv4Addr::is_documentation`]
7544 * [`Ipv6Addr::is_unspecified`]
7545 * [`Ipv6Addr::is_loopback`]
7546 * [`Ipv6Addr::is_multicast`]
7549 * [`Vec::as_mut_slice`]
7551 * [`String::as_str`]
7552 * [`String::as_mut_str`]
7554 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7556 * `<[T]>::`[`sort_by_key`]
7557 * checked, saturated, and overflowing operations
7558 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7559 * [`i32::saturating_mul`]
7560 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7561 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7562 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7563 * [`u32::saturating_mul`]
7564 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7565 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7566 * and checked, saturated, and overflowing operations for other primitive types
7568 * [`ffi::IntoStringError`]
7569 * [`CString::into_string`]
7570 * [`CString::into_bytes`]
7571 * [`CString::into_bytes_with_nul`]
7572 * `From<CString> for Vec<u8>`
7574 * [`IntoStringError::into_cstring`]
7575 * [`IntoStringError::utf8_error`]
7576 * `Error for IntoStringError`
7578 * [`std::hash::BuildHasher`]
7579 * [`BuildHasher::Hasher`]
7580 * [`BuildHasher::build_hasher`]
7581 * [`std::hash::BuildHasherDefault`]
7582 * [`HashMap::with_hasher`]
7583 * [`HashMap::with_capacity_and_hasher`]
7584 * [`HashSet::with_hasher`]
7585 * [`HashSet::with_capacity_and_hasher`]
7586 * [`std::collections::hash_map::RandomState`]
7587 * [`RandomState::new`]
7588 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7589 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7590 from bytes is faster.
7591 * [The performance of `LineWriter` (and thus `io::stdout`) was
7592 improved by using `memchr` to search for newlines][1.7m].
7593 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7594 `f64` variants were stabilized previously.
7595 * [`BTreeMap` was rewritten to use less memory and improve the performance
7596 of insertion and iteration, the latter by as much as 5x][1.7bm].
7597 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7598 covariant over their contained type][1.7bt].
7599 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7600 over their contained type][1.7ll].
7601 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7603 * [`Any` is implemented for unsized types][1.7a].
7604 * [`Hash` is implemented for `Duration`][1.7h].
7609 * [When running tests with `--test`, rustdoc will pass `--cfg`
7610 arguments to the compiler][1.7dt].
7611 * [The compiler is built with RPATH information by default][1.7rpa].
7612 This means that it will be possible to run `rustc` when installed in
7613 unusual configurations without configuring the dynamic linker search
7615 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7616 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7617 over `LD_LIBRARY_PATH`.
7622 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7623 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7624 * [The `rerun-if-changed` build script directive no longer causes the
7625 build script to incorrectly run twice in certain scenarios][1.7rr].
7630 * Soundness fixes to the interactions between associated types and
7631 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7632 code that violates the new rules. This is a significant change that
7633 is known to break existing code, so it has emitted warnings for the
7634 new error cases since 1.4 to give crate authors time to adapt. The
7635 details of what is changing are subtle; read the RFC for more.
7636 * [Several bugs in the compiler's visibility calculations were
7637 fixed][1.7v]. Since this was found to break significant amounts of
7638 code, the new errors will be emitted as warnings for several release
7639 cycles, under the `private_in_public` lint.
7640 * Defaulted type parameters were accidentally accepted in positions
7641 that were not intended. In this release, [defaulted type parameters
7642 appearing outside of type definitions will generate a
7643 warning][1.7d], which will become an error in future releases.
7644 * [Parsing "." as a float results in an error instead of 0][1.7p].
7645 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7646 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7648 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7649 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7650 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7651 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7652 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7653 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7654 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7655 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7656 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7657 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7658 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7659 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7660 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7661 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7662 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7663 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7664 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7665 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7666 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7667 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7668 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7669 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7670 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7671 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7672 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7673 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7674 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7675 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7676 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7677 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7678 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7679 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7680 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7681 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7682 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7683 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7684 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7685 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7686 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7687 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7688 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7689 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7690 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7691 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7692 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7693 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7694 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7695 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7696 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7697 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7698 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7699 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7700 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7701 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7702 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7703 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7704 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7705 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7706 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7707 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7708 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7709 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7710 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7711 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7712 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7713 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7714 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7715 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7716 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7717 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7718 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7719 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7720 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7721 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7722 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7723 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7724 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7725 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7726 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7729 Version 1.6.0 (2016-01-21)
7730 ==========================
7735 * The `#![no_std]` attribute causes a crate to not be linked to the
7736 standard library, but only the [core library][1.6co], as described
7737 in [RFC 1184]. The core library defines common types and traits but
7738 has no platform dependencies whatsoever, and is the basis for Rust
7739 software in environments that cannot support a full port of the
7740 standard library, such as operating systems. Most of the core
7741 library is now stable.
7747 [`Read::read_exact`],
7748 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7749 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7750 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7751 [`os::unix::fs::DirBuilderExt`],
7752 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7753 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7754 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7755 [`collections::hash_map::Drain`],
7756 [`collections::hash_map::HashMap::drain`],
7757 [`collections::hash_set::Drain`],
7758 [`collections::hash_set::HashSet::drain`],
7759 [`collections::binary_heap::Drain`],
7760 [`collections::binary_heap::BinaryHeap::drain`],
7761 [`Vec::extend_from_slice`] (renamed from `push_all`),
7762 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7763 [`RwLock::into_inner`],
7764 [`Iterator::min_by_key`] (renamed from `min_by`),
7765 [`Iterator::max_by_key`] (renamed from `max_by`).
7766 * The [core library][1.6co] is stable, as are most of its APIs.
7767 * [The `assert_eq!` macro supports arguments that don't implement
7768 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7770 * Several timer functions that take duration in milliseconds [are
7771 deprecated in favor of those that take `Duration`][1.6ms]. These
7772 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7773 `thread::park_timeout_ms`.
7774 * The algorithm by which `Vec` reserves additional elements was
7775 [tweaked to not allocate excessive space][1.6a] while still growing
7777 * `From` conversions are [implemented from integers to floats][1.6f]
7778 in cases where the conversion is lossless. Thus they are not
7779 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7780 or `f64`. They are also not implemented for `isize` and `usize`
7781 because the implementations would be platform-specific. `From` is
7782 also implemented from `f32` to `f64`.
7783 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7784 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7785 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7786 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7788 * Sorting slices that are already sorted [is 50% faster in some
7794 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7795 * Cargo build scripts can specify their dependencies by emitting the
7796 [`rerun-if-changed`][1.6rr] key.
7797 * crates.io will reject publication of crates with dependencies that
7798 have a wildcard version constraint. Crates with wildcard
7799 dependencies were seen to cause a variety of problems, as described
7800 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7802 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7803 release folder. A variety of artifacts that Cargo failed to clean
7804 are now correctly deleted.
7809 * The `unreachable_code` lint [warns when a function call's argument
7811 * The parser indicates [failures that may be caused by
7812 confusingly-similar Unicode characters][1.6uc]
7813 * Certain macro errors [are reported at definition time][1.6m], not
7819 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7820 environment variable when locating crates. This was a pre-cargo
7821 feature for integrating with the package manager that was
7822 accidentally never removed.
7823 * [A number of bugs were fixed in the privacy checker][1.6p] that
7824 could cause previously-accepted code to break.
7825 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7826 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7827 struct pattern syntax (`Foo(..)`) can no longer be used to match
7828 unit structs. This is a warning now, but will become an error in
7829 future releases. Patterns that share the same name as a const are
7831 * A bug was fixed that causes [rustc not to apply default type
7832 parameters][1.6xc] when resolving certain method implementations of
7833 traits defined in other crates.
7835 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7836 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7837 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7838 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7839 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7840 [1.6co]: http://doc.rust-lang.org/core/index.html
7841 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7842 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7843 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7844 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7845 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7846 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7847 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7848 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7849 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7850 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7851 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7852 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7853 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7854 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7855 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7856 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7857 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7858 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7859 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7860 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7861 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7862 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7863 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7864 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7865 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7866 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7867 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7868 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7869 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7870 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7871 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7872 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7873 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7874 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7875 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7876 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7877 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7878 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7879 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7880 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7881 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7884 Version 1.5.0 (2015-12-10)
7885 ==========================
7887 * ~700 changes, numerous bugfixes
7893 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7894 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7895 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7896 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7897 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7898 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7899 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7900 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7901 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7902 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7903 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7904 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7905 [`Path::read_link`], [`Path::symlink_metadata`],
7906 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7907 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7908 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7909 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7910 [`slice::split_first_mut`], [`slice::split_first`],
7911 [`slice::split_last_mut`], [`slice::split_last`],
7912 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7913 [`str::MatchIndices`], [`str::RMatchIndices`],
7914 [`str::match_indices`], [`str::rmatch_indices`],
7915 [`str::slice_mut_unchecked`], [`string::ParseError`].
7916 * Rust applications hosted on crates.io can be installed locally to
7917 `~/.cargo/bin` with the [`cargo install`] command. Among other
7918 things this makes it easier to augment Cargo with new subcommands:
7919 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7920 invoked as `cargo foo`.
7921 * Crates with wildcard (`*`) dependencies will [emit warnings when
7922 published][1.5w]. In 1.6 it will no longer be possible to publish
7923 crates with wildcard dependencies.
7928 * The rules determining when a particular lifetime must outlive
7929 a particular value (known as '[dropck]') have been [modified
7930 to not rely on parametricity][1.5p].
7931 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7932 and `Arc`][1.5a]. Because these smart pointer types implement
7933 `Deref`, this causes breakage in cases where the interior type
7934 contains methods of the same name.
7935 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7936 that they could drop their content. Soundness fix.
7937 * All method invocations are [properly checked][1.5wf1] for
7938 [well-formedness][1.5wf2]. Soundness fix.
7939 * Traits whose supertraits contain `Self` are [not object
7940 safe][1.5o]. Soundness fix.
7941 * Target specifications support a [`no_default_libraries`][1.5nd]
7942 setting that controls whether `-nodefaultlibs` is passed to the
7943 linker, and in turn the `is_like_windows` setting no longer affects
7944 the `-nodefaultlibs` flag.
7945 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7946 * The `#[inline]` and `#[repr]` attributes [can only appear
7947 in valid locations][1.5at].
7948 * Native libraries linked from the local crate are [passed to
7949 the linker before native libraries from upstream crates][1.5nl].
7950 * Two rarely-used attributes, `#[no_debug]` and
7951 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7952 * Negation of unsigned integers, which has been a warning for
7953 several releases, [is now behind a feature gate and will
7954 generate errors][1.5nu].
7955 * The parser accidentally accepted visibility modifiers on
7956 enum variants, a bug [which has been fixed][1.5ev].
7957 * [A bug was fixed that allowed `use` statements to import unstable
7963 * When evaluating expressions at compile-time that are not
7964 compile-time constants (const-evaluating expressions in non-const
7965 contexts), incorrect code such as overlong bitshifts and arithmetic
7966 overflow will [generate a warning instead of an error][1.5ce],
7967 delaying the error until runtime. This will allow the
7968 const-evaluator to be expanded in the future backwards-compatibly.
7969 * The `improper_ctypes` lint [no longer warns about using `isize` and
7970 `usize` in FFI][1.5ict].
7975 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7977 * `Default` is [implemented for mutable slices][1.5d].
7978 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7979 * There are now `From` conversions [between floating point
7980 types][1.5f] where the conversions are lossless.
7981 * There are now `From` conversions [between integer types][1.5i] where
7982 the conversions are lossless.
7983 * [`fs::Metadata` implements `Clone`][1.5fs].
7984 * The `parse` method [accepts a leading "+" when parsing
7986 * [`AsMut` is implemented for `Vec`][1.5am].
7987 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7988 been optimized][1.5cf] and no longer rely on the default impl.
7989 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7990 `unsafe extern "C"` function types now [implement `Clone`,
7991 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7992 `fmt::Debug` for up to 12 arguments][1.5fp].
7993 * [Dropping `Vec`s is much faster in unoptimized builds when the
7994 element types don't implement `Drop`][1.5dv].
7995 * A bug that caused in incorrect behavior when [combining `VecDeque`
7996 with zero-sized types][1.5vdz] was resolved.
7997 * [`PartialOrd` for slices is faster][1.5po].
8002 * [Crate metadata size was reduced by 20%][1.5md].
8003 * [Improvements to code generation reduced the size of libcore by 3.3
8004 MB and rustc's memory usage by 18MB][1.5m].
8005 * [Improvements to deref translation increased performance in
8006 unoptimized builds][1.5dr].
8007 * Various errors in trait resolution [are deduplicated to only be
8008 reported once][1.5te].
8009 * Rust has preliminary [support for rumprun kernels][1.5rr].
8010 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8012 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8013 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8014 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8015 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8016 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8017 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8018 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8019 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8020 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8021 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8022 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8023 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8024 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8025 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8026 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8027 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8028 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8029 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8030 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8031 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8032 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8033 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8034 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8035 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8036 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8037 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8038 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8039 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8040 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8041 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8042 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8043 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8044 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8045 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8046 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8047 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8048 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8049 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8050 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8051 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8052 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8053 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8054 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8055 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8056 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8057 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8058 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8059 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8060 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8061 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8062 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8063 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8064 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8065 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8066 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8067 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8068 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8069 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8070 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8071 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8072 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8073 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8074 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8075 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8076 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8077 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8078 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8079 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8080 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8081 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8082 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8083 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8084 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8085 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8086 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8087 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8088 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8089 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8090 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8091 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8092 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8093 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8094 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8095 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8096 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8097 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8098 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8099 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8100 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8102 Version 1.4.0 (2015-10-29)
8103 ==========================
8105 * ~1200 changes, numerous bugfixes
8110 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8111 GNU) are now supported and recommended for use.
8116 * [Several changes have been made to fix type soundness and improve
8117 the behavior of associated types][sound]. See [RFC 1214]. Although
8118 we have mostly introduced these changes as warnings this release, to
8119 become errors next release, there are still some scenarios that will
8120 see immediate breakage.
8121 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8122 line breaks in addition to `\n`][crlf].
8123 * [Loans of `'static` lifetime extend to the end of a function][stat].
8124 * [`str::parse` no longer introduces avoidable rounding error when
8125 parsing floating point numbers. Together with earlier changes to
8126 float formatting/output, "round trips" like f.to_string().parse()
8127 now preserve the value of f exactly. Additionally, leading plus
8128 signs are now accepted][fp3].
8134 * `use` statements that import multiple items [can now rename
8135 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8136 * [Binops work correctly on fat pointers][binfat].
8137 * `pub extern crate`, which does not behave as expected, [issues a
8138 warning][pec] until a better solution is found.
8143 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8144 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8145 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8146 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8147 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8148 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8149 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8150 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8151 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8152 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8153 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8154 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8155 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8156 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8157 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8158 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8159 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8160 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8162 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8163 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8164 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8165 `f64::from_str_radix`.
8166 * [Reverse-searching strings is faster with the 'two-way'
8168 * [`std::io::copy` allows `?Sized` arguments][cc].
8169 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8170 [override `count`, `nth` and `last` with an O(1)
8171 implementation][it].
8172 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8173 * [`IntoRawFd` has been added to the Unix-specific prelude,
8174 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8176 * [`Extend<String>` and `FromIterator<String` are both implemented for
8178 * [`IntoIterator` is implemented for references to `Option` and
8180 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8181 Copy`][ext] as part of [RFC 839]. This will cause type inference
8182 breakage in rare situations.
8183 * [`BinaryHeap` implements `Debug`][bh2].
8184 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8186 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8187 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8188 * [String comparison is faster][faststr].
8189 * `&mut T` where `T: std::fmt::Write` [also implements
8190 `std::fmt::Write`][mutw].
8191 * [A stable regression in `VecDeque::push_back` and other
8192 capacity-altering methods that caused panics for zero-sized types
8194 * [Function pointers implement traits for up to 12 parameters][fp2].
8199 * The compiler [no longer uses the 'morestack' feature to prevent
8200 stack overflow][mm]. Instead it uses guard pages and stack
8201 probes (though stack probes are not yet implemented on any platform
8203 * [The compiler matches traits faster when projections are involved][p].
8204 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8206 * [Cargo now displays useful information about what its doing during
8207 `cargo update`][cu].
8209 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8210 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8211 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8212 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8213 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8214 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8215 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8216 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8217 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8218 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8219 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8220 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8221 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8222 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8223 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8224 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8225 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8226 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8227 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8228 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8229 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8230 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8231 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8232 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8233 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8234 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8235 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8236 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8237 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8238 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8239 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8240 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8241 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8242 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8243 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8244 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8245 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8246 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8247 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8248 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8249 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8250 [bh2]: https://github.com/rust-lang/rust/pull/28156
8251 [binfat]: https://github.com/rust-lang/rust/pull/28270
8252 [bm]: https://github.com/rust-lang/rust/pull/28197
8253 [cc]: https://github.com/rust-lang/rust/pull/27531
8254 [crlf]: https://github.com/rust-lang/rust/pull/28034
8255 [cu]: https://github.com/rust-lang/cargo/pull/1931
8256 [d]: https://github.com/rust-lang/rust/pull/27825
8257 [dep]: https://github.com/rust-lang/rust/pull/28339
8258 [es]: https://github.com/rust-lang/rust/pull/27956
8259 [ext]: https://github.com/rust-lang/rust/pull/28094
8260 [faststr]: https://github.com/rust-lang/rust/pull/28338
8261 [ffi]: https://github.com/rust-lang/rust/pull/28779
8262 [fp]: https://github.com/rust-lang/rust/pull/28268
8263 [fp2]: https://github.com/rust-lang/rust/pull/28560
8264 [fp3]: https://github.com/rust-lang/rust/pull/27307
8265 [i]: https://github.com/rust-lang/rust/pull/27451
8266 [into2]: https://github.com/rust-lang/rust/pull/28039
8267 [it]: https://github.com/rust-lang/rust/pull/27652
8268 [mm]: https://github.com/rust-lang/rust/pull/27338
8269 [mutw]: https://github.com/rust-lang/rust/pull/28368
8270 [sound]: https://github.com/rust-lang/rust/pull/27641
8271 [p]: https://github.com/rust-lang/rust/pull/27866
8272 [pec]: https://github.com/rust-lang/rust/pull/28486
8273 [pr]: https://github.com/rust-lang/rust/pull/27896
8274 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8275 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8276 [s]: https://github.com/rust-lang/rust/pull/27474
8277 [stab]: https://github.com/rust-lang/rust/pull/28339
8278 [stat]: https://github.com/rust-lang/rust/pull/28321
8279 [vd]: https://github.com/rust-lang/rust/pull/28494
8281 Version 1.3.0 (2015-09-17)
8282 ==============================
8284 * ~900 changes, numerous bugfixes
8289 * The [new object lifetime defaults][nold] have been [turned
8290 on][nold2] after a cycle of warnings about the change. Now types
8291 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8292 being interpreted as `&'a Box<Trait+'a>` to `&'a
8293 Box<Trait+'static>`.
8294 * [The Rustonomicon][nom] is a new book in the official documentation
8295 that dives into writing unsafe Rust.
8296 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8297 timekeeping is employed by other std APIs, as well as out-of-tree
8303 * The [new object lifetime defaults][nold] have been [turned
8304 on][nold2] after a cycle of warnings about the change.
8305 * There is a known [regression][lr] in how object lifetime elision is
8306 interpreted, the proper solution for which is undetermined.
8307 * The `#[prelude_import]` attribute, an internal implementation
8308 detail, was accidentally stabilized previously. [It has been put
8309 behind the `prelude_import` feature gate][pi]. This change is
8310 believed to break no existing code.
8311 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8312 [more sane for dynamically sized types][dst3]. Code that relied on
8313 the previous behavior is thought to be broken.
8314 * The `dropck` rules, which checks that destructors can't access
8315 destroyed values, [have been updated][dropck] to match the
8316 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8317 cause some previously-compiling code to no longer build.
8322 * The [new object lifetime defaults][nold] have been [turned
8323 on][nold2] after a cycle of warnings about the change.
8324 * Semicolons may [now follow types and paths in
8325 macros](https://github.com/rust-lang/rust/pull/27000).
8326 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8327 [more sane for dynamically sized types][dst3]. Code that relied on
8328 the previous behavior is not known to exist, and suspected to be
8330 * `'static` variables [may now be recursive][st].
8331 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8332 implementations correctly.
8333 * The `dropck` rules, which checks that destructors can't access
8334 destroyed values, [have been updated][dropck] to match the
8340 * The [`Duration`] API, [has been stabilized][ds], as well as the
8341 `std::time` module, which presently contains only `Duration`.
8342 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8343 * The owned C string, [`CString`], implements [`Borrow`] and the
8344 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8345 these allow C strings to be borrowed and cloned in generic code.
8346 * [`CStr`] implements [`Debug`].
8347 * [`AtomicPtr`] implements [`Debug`].
8348 * [`Error`] trait objects [can be downcast to their concrete types][e]
8349 in many common configurations, using the [`is`], [`downcast`],
8350 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8352 * Searching for substrings now [employs the two-way algorithm][search]
8353 instead of doing a naive search. This gives major speedups to a
8354 number of methods, including [`contains`][sc], [`find`][sf],
8355 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8356 [`ends_with`][sew] are also faster.
8357 * The performance of `PartialEq` for slices is [much faster][ps].
8358 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8359 is overridden and optimized by the implementations for scalars.
8360 * The [`Hasher`] trait now has a number of specialized `write_*`
8361 methods for primitive types, for efficiency.
8362 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8363 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8364 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8365 of [`std::error::Error::cause`][iec] also delegates to the inner
8367 * [`process::Child`][pc] gained the [`id`] method, which returns a
8368 `u32` representing the platform-specific process identifier.
8369 * The [`connect`] method on slices is deprecated, replaced by the new
8370 [`join`] method (note that both of these are on the *unstable*
8371 [`SliceConcatExt`] trait, but through the magic of the prelude are
8372 available to stable code anyway).
8373 * The [`Div`] operator is implemented for [`Wrapping`] types.
8374 * [`DerefMut` is implemented for `String`][dms].
8375 * Performance of SipHash (the default hasher for `HashMap`) is
8376 [better for long data][sh].
8377 * [`AtomicPtr`] implements [`Send`].
8378 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8379 are now [specialized to use uninitialized buffers for increased
8381 * Lifetime parameters of foreign functions [are now resolved
8387 * Rust can now, with some coercion, [produce programs that run on
8388 Windows XP][xp], though XP is not considered a supported platform.
8389 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8390 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8391 recommended for use in 1.3, though should be fully-functional
8392 in the [64-bit 1.4 beta][b14].
8393 * On Fedora-based systems installation will [properly configure the
8394 dynamic linker][fl].
8395 * The compiler gained many new extended error descriptions, which can
8396 be accessed with the `--explain` flag.
8397 * The `dropck` pass, which checks that destructors can't access
8398 destroyed values, [has been rewritten][dropck]. This fixes some
8399 soundness holes, and as such will cause some previously-compiling
8400 code to no longer build.
8401 * `rustc` now uses [LLVM to write archive files where possible][ar].
8402 Eventually this will eliminate the compiler's dependency on the ar
8404 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8405 supported FreeBSD on x86_64).
8406 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8407 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8409 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8410 will kill the process instead of leaking][nlp].
8412 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8413 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8414 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8415 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8416 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8417 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8418 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8419 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8420 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8421 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8422 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8423 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8424 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8425 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8426 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8427 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8428 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8429 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8430 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8431 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8432 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8433 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8434 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8435 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8436 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8437 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8438 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8439 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8440 [ar]: https://github.com/rust-lang/rust/pull/26926
8441 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8442 [dms]: https://github.com/rust-lang/rust/pull/26241
8443 [dropck]: https://github.com/rust-lang/rust/pull/27261
8444 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8445 [ds]: https://github.com/rust-lang/rust/pull/26818
8446 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8447 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8448 [dst3]: https://github.com/rust-lang/rust/pull/27351
8449 [e]: https://github.com/rust-lang/rust/pull/24793
8450 [f]: https://github.com/rust-lang/rust/pull/26588
8451 [fb]: https://github.com/rust-lang/rust/pull/26959
8452 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8453 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8454 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8455 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8456 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8457 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8458 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8459 [lic]: https://github.com/rust-lang/rust/pull/26583
8460 [lnu]: https://github.com/rust-lang/rust/pull/27026
8461 [lr]: https://github.com/rust-lang/rust/issues/27248
8462 [lum]: https://github.com/rust-lang/rust/pull/26378
8463 [lur]: https://github.com/rust-lang/rust/pull/26783
8464 [nlp]: https://github.com/rust-lang/rust/pull/27176
8465 [nold2]: https://github.com/rust-lang/rust/pull/27045
8466 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8467 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8468 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8469 [pi]: https://github.com/rust-lang/rust/pull/26699
8470 [ps]: https://github.com/rust-lang/rust/pull/26884
8471 [rte]: https://github.com/rust-lang/rust/pull/26950
8472 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8473 [search]: https://github.com/rust-lang/rust/pull/26327
8474 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8475 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8476 [sh]: https://github.com/rust-lang/rust/pull/27280
8477 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8478 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8479 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8480 [st]: https://github.com/rust-lang/rust/pull/26630
8481 [win1]: https://github.com/rust-lang/rust/pull/26569
8482 [win2]: https://github.com/rust-lang/rust/pull/26741
8483 [win3]: https://github.com/rust-lang/rust/pull/26741
8484 [win4]: https://github.com/rust-lang/rust/pull/27210
8485 [xp]: https://github.com/rust-lang/rust/pull/26569
8487 Version 1.2.0 (2015-08-07)
8488 ==========================
8490 * ~1200 changes, numerous bugfixes
8495 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8496 like `Rc` to contain types without a fixed size, arrays and trait
8497 objects, finally enabling use of `Rc<[T]>` and completing the
8498 implementation of DST.
8499 * [Parallel codegen][parcodegen] is now working again, which can
8500 substantially speed up large builds in debug mode; It also gets
8501 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8502 jobs). It's not enabled by default, but will be "in the near
8503 future". It can be activated with the `-C codegen-units=N` flag to
8505 * This is the first release with [experimental support for linking
8506 with the MSVC linker and lib C on Windows (instead of using the GNU
8507 variants via MinGW)][win]. It is yet recommended only for the most
8508 intrepid Rustaceans.
8509 * Benchmark compilations are showing a 30% improvement in
8510 bootstrapping over 1.1.
8515 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8516 unicode case mapping, which is a previously-planned change in
8517 behavior and considered a bugfix.
8518 * [`mem::align_of`] now specifies [the *minimum alignment* for
8519 T][align], which is usually the alignment programs are interested
8520 in, and the same value reported by clang's
8521 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8523 * [The `#[packed]` attribute is no longer silently accepted by the
8524 compiler][packed]. This attribute did nothing and code that
8525 mentioned it likely did not work as intended.
8526 * Associated type defaults are [now behind the
8527 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8528 defaults *did not work*, but could be mentioned syntactically. As
8529 such this breakage has minimal impact.
8534 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8535 matching against dereferenceable values.
8540 * The [`Extend`] trait, which grows a collection from an iterator, is
8541 implemented over iterators of references, for `String`, `Vec`,
8542 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8543 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8544 * The [`iter::once`] function returns an iterator that yields a single
8545 element, and [`iter::empty`] returns an iterator that yields no
8547 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8548 over substring matches.
8549 * [`Cell`] and [`RefCell`] both implement `Eq`.
8550 * A number of methods for wrapping arithmetic are added to the
8551 integral types, [`wrapping_div`], [`wrapping_rem`],
8552 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8553 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8554 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8555 type.. It is illegal for the default arithmetic operations in Rust
8556 to overflow; the desire to wrap must be explicit.
8557 * The `{:#?}` formatting specifier [displays the alternate,
8558 pretty-printed][debugfmt] form of the `Debug` formatter. This
8559 feature was actually introduced prior to 1.0 with little
8561 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8562 for writing data to formatted strings, similar to [`io::Write`].
8563 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8564 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8565 are used by code generators to emit implementations of [`Debug`].
8566 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8567 methods that convert case, following Unicode case mapping.
8568 * It is now easier to handle poisoned locks. The [`PoisonError`]
8569 type, returned by failing lock operations, exposes `into_inner`,
8570 `get_ref`, and `get_mut`, which all give access to the inner lock
8571 guard, and allow the poisoned lock to continue to operate. The
8572 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8573 poisoned lock without attempting to take the lock.
8574 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8575 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8576 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8577 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8579 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8585 * `rustc` employs smarter heuristics for guessing at [typos].
8586 * `rustc` emits more efficient code for [no-op conversions between
8587 unsafe pointers][nop].
8588 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8589 resulting in faster compile times and smaller code.
8591 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8592 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8593 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8594 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8595 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8596 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8597 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8598 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8599 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8600 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8601 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8602 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8603 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8604 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8605 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8606 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8607 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8608 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8609 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8610 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8611 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8612 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8613 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8614 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8615 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8616 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8617 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8618 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8619 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8620 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8621 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8622 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8623 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8624 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8625 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8626 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8627 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8628 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8629 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8630 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8631 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8632 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8633 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8634 [align]: https://github.com/rust-lang/rust/pull/25646
8635 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8636 [typos]: https://github.com/rust-lang/rust/pull/26087
8637 [nop]: https://github.com/rust-lang/rust/pull/26336
8638 [fat]: https://github.com/rust-lang/rust/pull/26411
8639 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8640 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8641 [packed]: https://github.com/rust-lang/rust/pull/25541
8642 [ad]: https://github.com/rust-lang/rust/pull/27382
8643 [win]: https://github.com/rust-lang/rust/pull/25350
8645 Version 1.1.0 (2015-06-25)
8646 =========================
8648 * ~850 changes, numerous bugfixes
8653 * The [`std::fs` module has been expanded][fs] to expand the set of
8654 functionality exposed:
8655 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8656 don't incur a syscall on some platforms.
8657 * A `symlink_metadata` function has been added.
8658 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8659 access to all underlying information.
8660 * The compiler now contains extended explanations of many errors. When an error
8661 with an explanation occurs the compiler suggests using the `--explain` flag
8662 to read the explanation. Error explanations are also [available online][err-index].
8663 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8664 well as other work, the time to bootstrap the compiler decreased by
8670 * The [`str::split_whitespace`] method splits a string on unicode
8671 whitespace boundaries.
8672 * On both Windows and Unix, new extension traits provide conversion of
8673 I/O types to and from the underlying system handles. On Unix, these
8674 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8675 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8676 `TcpListener`, and `UpdSocket`. Further implementations for
8677 `std::process` will be stabilized later.
8678 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8679 Windows, symlinks can be created with
8680 `std::os::windows::symlink_dir` and
8681 `std::os::windows::symlink_file`.
8682 * The `mpsc::Receiver` type can now be converted into an iterator with
8683 `into_iter` on the [`IntoIterator`] trait.
8684 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8685 implementation of the [`From`] trait.
8686 * The `Debug` implementation for `RangeFull` [creates output that is
8687 more consistent with other implementations][rf].
8688 * [`Debug` is implemented for `File`][file].
8689 * The `Default` implementation for `Arc` [no longer requires `Sync +
8691 * [The `Iterator` methods `count`, `nth`, and `last` have been
8692 overridden for slices to have O(1) performance instead of O(n)][si].
8693 * Incorrect handling of paths on Windows has been improved in both the
8694 compiler and the standard library.
8695 * [`AtomicPtr` gained a `Default` implementation][ap].
8696 * In accordance with Rust's policy on arithmetic overflow `abs` now
8697 [panics on overflow when debug assertions are enabled][abs].
8698 * The [`Cloned`] iterator, which was accidentally left unstable for
8699 1.0 [has been stabilized][c].
8700 * The [`Incoming`] iterator, which iterates over incoming TCP
8701 connections, and which was accidentally unnamable in 1.0, [is now
8702 properly exported][inc].
8703 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8704 `sift_up` or `sift_down` panic][bh].
8705 * The [`split_off`] method of `LinkedList` [no longer corrupts
8706 the list in certain scenarios][ll].
8711 * Type checking performance [has improved notably][sk] with
8712 [multiple improvements][pre].
8713 * The compiler [suggests code changes][ch] for more errors.
8714 * rustc and it's build system have experimental support for [building
8715 toolchains against MUSL][m] instead of glibc on Linux.
8716 * The compiler defines the `target_env` cfg value, which is used for
8717 distinguishing toolchains that are otherwise for the same
8718 platform. Presently this is set to `gnu` for common GNU Linux
8719 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8720 * The [`cargo rustc`][crc] command invokes a build with custom flags
8722 * [Android executables are always position independent][pie].
8723 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8726 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8727 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8728 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8729 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8730 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8731 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8732 [rf]: https://github.com/rust-lang/rust/pull/24491
8733 [err-index]: https://doc.rust-lang.org/error-index.html
8734 [sk]: https://github.com/rust-lang/rust/pull/24615
8735 [pre]: https://github.com/rust-lang/rust/pull/25323
8736 [file]: https://github.com/rust-lang/rust/pull/24598
8737 [ch]: https://github.com/rust-lang/rust/pull/24683
8738 [arc]: https://github.com/rust-lang/rust/pull/24695
8739 [si]: https://github.com/rust-lang/rust/pull/24701
8740 [ap]: https://github.com/rust-lang/rust/pull/24834
8741 [m]: https://github.com/rust-lang/rust/pull/24777
8742 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8743 [crc]: https://github.com/rust-lang/cargo/pull/1568
8744 [pie]: https://github.com/rust-lang/rust/pull/24953
8745 [abs]: https://github.com/rust-lang/rust/pull/25441
8746 [c]: https://github.com/rust-lang/rust/pull/25496
8747 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8748 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8749 [inc]: https://github.com/rust-lang/rust/pull/25522
8750 [bh]: https://github.com/rust-lang/rust/pull/25856
8751 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8752 [ll]: https://github.com/rust-lang/rust/pull/26022
8753 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8754 [drop]: https://github.com/rust-lang/rust/pull/24935
8756 Version 1.0.0 (2015-05-15)
8757 ========================
8759 * ~1500 changes, numerous bugfixes
8764 * The vast majority of the standard library is now `#[stable]`. It is
8765 no longer possible to use unstable features with a stable build of
8767 * Many popular crates on [crates.io] now work on the stable release
8769 * Arithmetic on basic integer types now [checks for overflow in debug
8775 * Several [restrictions have been added to trait coherence][coh] in
8776 order to make it easier for upstream authors to change traits
8777 without breaking downstream code.
8778 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8779 improve error messages and macro behavior. For example, `0b1234` is
8780 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8781 * Trait bounds [are always invariant][inv], eliminating the need for
8782 the `PhantomFn` and `MarkerTrait` lang items, which have been
8784 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8785 "foo" as bar` syntax has been replaced with `extern crate foo as
8786 bar`, and Cargo now automatically translates "-" in *package* names
8787 to underscore for the crate name.
8788 * [Lifetime shadowing is an error][lt].
8789 * [`Send` no longer implies `'static`][send-rfc].
8790 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8791 `MyType::default()`.
8792 * Primitive types [now have inherent methods][prim-inherent],
8793 obviating the need for extension traits like `SliceExt`.
8794 * Methods with `Self: Sized` in their `where` clause are [considered
8795 object-safe][self-sized], allowing many extension traits like
8796 `IteratorExt` to be merged into the traits they extended.
8797 * You can now [refer to associated types][assoc-where] whose
8798 corresponding trait bounds appear only in a `where` clause.
8799 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8800 like `Send` and `Sync` are now library-defined.
8801 * A [Reflect trait][reflect] was introduced, which means that
8802 downcasting via the `Any` trait is effectively limited to concrete
8803 types. This helps retain the potentially-important "parametricity"
8804 property: generic code cannot behave differently for different type
8805 arguments except in minor ways.
8806 * The `unsafe_destructor` feature is now deprecated in favor of the
8807 [new `dropck`][dropck]. This change is a major reduction in unsafe
8813 * The `thread_local` module [has been renamed to `std::thread`][th].
8814 * The methods of `IteratorExt` [have been moved to the `Iterator`
8816 * Several traits that implement Rust's conventions for type
8817 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8818 [centralized in the `std::convert` module][con].
8819 * The `FromError` trait [was removed in favor of `From`][fe].
8820 * The basic sleep function [has moved to
8821 `std::thread::sleep_ms`][slp].
8822 * The `splitn` function now takes an `n` parameter that represents the
8823 number of items yielded by the returned iterator [instead of the
8824 number of 'splits'][spl].
8825 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8826 * [Derived implementations of `PartialOrd` now order enums according
8827 to their explicitly-assigned discriminants][po].
8828 * [Methods for searching strings are generic over `Pattern`s][pat],
8829 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8831 * [In method resolution, object methods are resolved before inherent
8833 * [`String::from_str` has been deprecated in favor of the `From` impl,
8834 `String::from`][sf].
8835 * [`io::Error` implements `Sync`][ios].
8836 * [The `words` method on `&str` has been replaced with
8837 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8839 * The new path and IO modules are complete and `#[stable]`. This
8840 was the major library focus for this cycle.
8841 * The path API was [revised][path-normalize] to normalize `.`,
8842 adjusting the tradeoffs in favor of the most common usage.
8843 * A large number of remaining APIs in `std` were also stabilized
8844 during this cycle; about 75% of the non-deprecated API surface
8846 * The new [string pattern API][string-pattern] landed, which makes
8847 the string slice API much more internally consistent and flexible.
8848 * A new set of [generic conversion traits][conversion] replaced
8849 many existing ad hoc traits.
8850 * Generic numeric traits were [completely removed][num-traits]. This
8851 was made possible thanks to inherent methods for primitive types,
8852 and the removal gives maximal flexibility for designing a numeric
8853 hierarchy in the future.
8854 * The `Fn` traits are now related via [inheritance][fn-inherit]
8855 and provide ergonomic [blanket implementations][fn-blanket].
8856 * The `Index` and `IndexMut` traits were changed to
8857 [take the index by value][index-value], enabling code like
8858 `hash_map["string"]` to work.
8859 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8860 `Copy` data is known to be `Clone` as well.
8865 * Many errors now have extended explanations that can be accessed with
8866 the `--explain` flag to `rustc`.
8867 * Many new examples have been added to the standard library
8869 * rustdoc has received a number of improvements focused on completion
8871 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8872 * Much headway was made on ecosystem-wide CI, making it possible
8873 to [compare builds for breakage][ci-compare].
8876 [crates.io]: http://crates.io
8877 [clo]: https://github.com/rust-lang/rust/pull/24034
8878 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8879 [con]: https://github.com/rust-lang/rust/pull/23875
8880 [cr]: https://github.com/rust-lang/rust/pull/23419
8881 [fe]: https://github.com/rust-lang/rust/pull/23879
8882 [ie]: https://github.com/rust-lang/rust/pull/23300
8883 [inv]: https://github.com/rust-lang/rust/pull/23938
8884 [ios]: https://github.com/rust-lang/rust/pull/24133
8885 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8886 [lt]: https://github.com/rust-lang/rust/pull/24057
8887 [meth]: https://github.com/rust-lang/rust/pull/24056
8888 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8889 [po]: https://github.com/rust-lang/rust/pull/24270
8890 [sf]: https://github.com/rust-lang/rust/pull/24517
8891 [slp]: https://github.com/rust-lang/rust/pull/23949
8892 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8893 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8894 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8895 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8896 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8897 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8898 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8899 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8900 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8901 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8902 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8903 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8904 [reflect]: https://github.com/rust-lang/rust/pull/23712
8905 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8906 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8907 [index-value]: https://github.com/rust-lang/rust/pull/23601
8908 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8909 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8910 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8911 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8912 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8913 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8916 Version 1.0.0-alpha.2 (2015-02-20)
8917 =====================================
8919 * ~1300 changes, numerous bugfixes
8923 * The various I/O modules were [overhauled][io-rfc] to reduce
8924 unnecessary abstractions and provide better interoperation with
8925 the underlying platform. The old `io` module remains temporarily
8927 * The standard library now [participates in feature gating][feat],
8928 so use of unstable libraries now requires a `#![feature(...)]`
8929 attribute. The impact of this change is [described on the
8930 forum][feat-forum]. [RFC][feat-rfc].
8934 * `for` loops [now operate on the `IntoIterator` trait][into],
8935 which eliminates the need to call `.iter()`, etc. to iterate
8936 over collections. There are some new subtleties to remember
8937 though regarding what sort of iterators various types yield, in
8938 particular that `for foo in bar { }` yields values from a move
8939 iterator, destroying the original collection. [RFC][into-rfc].
8940 * Objects now have [default lifetime bounds][obj], so you don't
8941 have to write `Box<Trait+'static>` when you don't care about
8942 storing references. [RFC][obj-rfc].
8943 * In types that implement `Drop`, [lifetimes must outlive the
8944 value][drop]. This will soon make it possible to safely
8945 implement `Drop` for types where `#[unsafe_destructor]` is now
8946 required. Read the [gorgeous RFC][drop-rfc] for details.
8947 * The fully qualified <T as Trait>::X syntax lets you set the Self
8948 type for a trait method or associated type. [RFC][ufcs-rfc].
8949 * References to types that implement `Deref<U>` now [automatically
8950 coerce to references][deref] to the dereferenced type `U`,
8951 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8952 should eliminate many unsightly uses of `&*`, as when converting
8953 from references to vectors into references to
8954 slices. [RFC][deref-rfc].
8955 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8956 `|:|`) is obsolete and closure kind is inferred from context.
8957 * [`Self` is a keyword][Self].
8961 * The `Show` and `String` formatting traits [have been
8962 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8963 their related purposes. Automatically getting a string
8964 conversion to use with `format!("{:?}", something_to_debug)` is
8965 now written `#[derive(Debug)]`.
8966 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8967 OsStr}`, provide strings in platform-specific encodings for easier
8968 interop with system APIs. [RFC][osstr-rfc].
8969 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8970 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8971 creating raw pointers.
8975 * Certain long error messages of the form 'expected foo found bar'
8976 are now [split neatly across multiple
8977 lines][multiline]. Examples in the PR.
8978 * On Unix Rust can be [uninstalled][un] by running
8979 `/usr/local/lib/rustlib/uninstall.sh`.
8980 * The `#[rustc_on_unimplemented]` attribute, requiring the
8981 'on_unimplemented' feature, lets rustc [display custom error
8982 messages when a trait is expected to be implemented for a type
8987 * Rust is tested against a [LALR grammar][lalr], which parses
8988 almost all the Rust files that rustc does.
8990 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8991 [close]: https://github.com/rust-lang/rust/pull/21843
8992 [deref]: https://github.com/rust-lang/rust/pull/21351
8993 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8994 [drop]: https://github.com/rust-lang/rust/pull/21972
8995 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8996 [feat]: https://github.com/rust-lang/rust/pull/21248
8997 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8998 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8999 [fmt]: https://github.com/rust-lang/rust/pull/21457
9000 [into]: https://github.com/rust-lang/rust/pull/20790
9001 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9002 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9003 [lalr]: https://github.com/rust-lang/rust/pull/21452
9004 [multiline]: https://github.com/rust-lang/rust/pull/19870
9005 [obj]: https://github.com/rust-lang/rust/pull/22230
9006 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9007 [onun]: https://github.com/rust-lang/rust/pull/20889
9008 [osstr]: https://github.com/rust-lang/rust/pull/21488
9009 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9010 [Self]: https://github.com/rust-lang/rust/pull/22158
9011 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9012 [un]: https://github.com/rust-lang/rust/pull/22256
9015 Version 1.0.0-alpha (2015-01-09)
9016 ==================================
9018 * ~2400 changes, numerous bugfixes
9022 * The language itself is considered feature complete for 1.0,
9023 though there will be many usability improvements and bugfixes
9024 before the final release.
9025 * Nearly 50% of the public API surface of the standard library has
9026 been declared 'stable'. Those interfaces are unlikely to change
9028 * The long-running debate over integer types has been
9029 [settled][ints]: Rust will ship with types named `isize` and
9030 `usize`, rather than `int` and `uint`, for pointer-sized
9031 integers. Guidelines will be rolled out during the alpha cycle.
9032 * Most crates that are not `std` have been moved out of the Rust
9033 distribution into the Cargo ecosystem so they can evolve
9034 separately and don't need to be stabilized as quickly, including
9035 'time', 'getopts', 'num', 'regex', and 'term'.
9036 * Documentation continues to be expanded with more API coverage, more
9037 examples, and more in-depth explanations. The guides have been
9038 consolidated into [The Rust Programming Language][trpl].
9039 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9040 * All official Rust binary installers now come with [Cargo], the
9041 Rust package manager.
9045 * Closures have been [completely redesigned][unboxed] to be
9046 implemented in terms of traits, can now be used as generic type
9047 bounds and thus monomorphized and inlined, or via an opaque
9048 pointer (boxed) as in the old system. The new system is often
9049 referred to as 'unboxed' closures.
9050 * Traits now support [associated types][assoc], allowing families
9051 of related types to be defined together and used generically in
9053 * Enum variants are [namespaced by their type names][enum].
9054 * [`where` clauses][where] provide a more versatile and attractive
9055 syntax for specifying generic bounds, though the previous syntax
9057 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9059 * Rust [no longer has a runtime][rt] of any description, and only
9060 supports OS threads, not green threads.
9061 * At long last, Rust has been overhauled for 'dynamically-sized
9062 types' ([DST]), which integrates 'fat pointers' (object types,
9063 arrays, and `str`) more deeply into the type system, making it
9065 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9066 `..j` that produce range types and which, when combined with the
9067 `Index` operator and multidispatch, leads to a convenient slice
9069 * The new range syntax revealed an ambiguity in the fixed-length
9070 array syntax, so now fixed length arrays [are written `[T;
9072 * The `Copy` trait is no longer implemented automatically. Unsafe
9073 pointers no longer implement `Sync` and `Send` so types
9074 containing them don't automatically either. `Sync` and `Send`
9075 are now 'unsafe traits' so one can "forcibly" implement them via
9076 `unsafe impl` if a type confirms to the requirements for them
9077 even though the internals do not (e.g. structs containing unsafe
9078 pointers like `Arc`). These changes are intended to prevent some
9079 footguns and are collectively known as [opt-in built-in
9080 traits][oibit] (though `Sync` and `Send` will soon become pure
9081 library types unknown to the compiler).
9082 * Operator traits now take their operands [by value][ops], and
9083 comparison traits can use multidispatch to compare one type
9084 against multiple other types, allowing e.g. `String` to be
9085 compared with `&str`.
9086 * `if let` and `while let` are no longer feature-gated.
9087 * Rust has adopted a more [uniform syntax for escaping unicode
9088 characters][unicode].
9089 * `macro_rules!` [has been declared stable][mac]. Though it is a
9090 flawed system it is sufficiently popular that it must be usable
9091 for 1.0. Effort has gone into [future-proofing][mac-future] it
9092 in ways that will allow other macro systems to be developed in
9093 parallel, and won't otherwise impact the evolution of the
9095 * The prelude has been [pared back significantly][prelude] such
9096 that it is the minimum necessary to support the most pervasive
9097 code patterns, and through [generalized where clauses][where]
9098 many of the prelude extension traits have been consolidated.
9099 * Rust's rudimentary reflection [has been removed][refl], as it
9100 incurred too much code generation for little benefit.
9101 * [Struct variants][structvars] are no longer feature-gated.
9102 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9103 known as 'higher-ranked trait bounds', this crucially allows
9104 unboxed closures to work.
9105 * Macros invocations surrounded by parens or square brackets and
9106 not terminated by a semicolon are [parsed as
9107 expressions][macros], which makes expressions like `vec![1i32,
9108 2, 3].len()` work as expected.
9109 * Trait objects now implement their traits automatically, and
9110 traits that can be coerced to objects now must be [object
9112 * Automatically deriving traits is now done with `#[derive(...)]`
9113 not `#[deriving(...)]` for [consistency with other naming
9114 conventions][derive].
9115 * Importing the containing module or enum at the same time as
9116 items or variants they contain is [now done with `self` instead
9117 of `mod`][self], as in use `foo::{self, bar}`
9118 * Glob imports are no longer feature-gated.
9119 * The `box` operator and `box` patterns have been feature-gated
9120 pending a redesign. For now unique boxes should be allocated
9121 like other containers, with `Box::new`.
9125 * A [series][coll1] of [efforts][coll2] to establish
9126 [conventions][coll3] for collections types has resulted in API
9127 improvements throughout the standard library.
9128 * New [APIs for error handling][err] provide ergonomic interop
9129 between error types, and [new conventions][err-conv] describe
9130 more clearly the recommended error handling strategies in Rust.
9131 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9132 it is easier to discuss failure in the context of error handling
9133 without making clarifications as to whether you are referring to
9134 the 'fail' macro or failure more generally.
9135 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9136 syscall when available.
9137 * The 'serialize' crate has been renamed 'rustc-serialize' and
9138 moved out of the distribution to Cargo. Although it is widely
9139 used now, it is expected to be superseded in the near future.
9140 * The `Show` formatter, typically implemented with
9141 `#[derive(Show)]` is [now requested with the `{:?}`
9142 specifier][show] and is intended for use by all types, for uses
9143 such as `println!` debugging. The new `String` formatter must be
9144 implemented by hand, uses the `{}` specifier, and is intended
9145 for full-fidelity conversions of things that can logically be
9146 represented as strings.
9150 * [Flexible target specification][flex] allows rustc's code
9151 generation to be configured to support otherwise-unsupported
9153 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9154 respective debuggers with Rust-appropriate pretty-printing.
9155 * The Windows installation of Rust is distributed with the
9156 MinGW components currently required to link binaries on that
9161 * Nullable enum optimizations have been extended to more types so
9162 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9163 space than the inner types themselves.
9164 * Work has begun on supporting AArch64.
9166 [Cargo]: https://crates.io
9167 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9168 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9169 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9170 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9171 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9172 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9173 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9174 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9175 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9176 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9177 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9178 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9179 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9180 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9181 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9182 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9183 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9184 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9185 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9186 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9187 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9188 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9189 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9190 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9191 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9192 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9193 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9194 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9195 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9196 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9197 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9198 [trpl]: https://doc.rust-lang.org/book/index.html
9199 [rbe]: http://rustbyexample.com/
9202 Version 0.12.0 (2014-10-09)
9203 =============================
9205 * ~1900 changes, numerous bugfixes
9209 * The introductory documentation (now called The Rust Guide) has
9210 been completely rewritten, as have a number of supplementary
9212 * Rust's package manager, Cargo, continues to improve and is
9213 sometimes considered to be quite awesome.
9214 * Many API's in `std` have been reviewed and updated for
9215 consistency with the in-development Rust coding
9216 guidelines. The standard library documentation tracks
9217 stabilization progress.
9218 * Minor libraries have been moved out-of-tree to the rust-lang org
9219 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9220 be installed with Cargo.
9221 * Lifetime elision allows lifetime annotations to be left off of
9222 function declarations in many common scenarios.
9223 * Rust now works on 64-bit Windows.
9226 * Indexing can be overloaded with the `Index` and `IndexMut`
9228 * The `if let` construct takes a branch only if the `let` pattern
9229 matches, currently behind the 'if_let' feature gate.
9230 * 'where clauses', a more flexible syntax for specifying trait
9231 bounds that is more aesthetic, have been added for traits and
9232 free functions. Where clauses will in the future make it
9233 possible to constrain associated types, which would be
9234 impossible with the existing syntax.
9235 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9236 the 'slicing_syntax' feature gate, and can be overloaded with
9237 the `Slice` or `SliceMut` traits.
9238 * The syntax for matching of sub-slices has been changed to use a
9239 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9240 consistency with other uses of `..` and to future-proof
9241 potential additional uses of the syntax.
9242 * The syntax for matching inclusive ranges in patterns has changed
9243 from `0..3` to `0...4` to be consistent with the exclusive range
9245 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9246 c]`) has been put behind the 'advanced_slice_patterns' feature
9247 gate and may be removed in the future.
9248 * Components of tuples and tuple structs can be extracted using
9249 the `value.0` syntax, currently behind the `tuple_indexing`
9251 * The `#[crate_id]` attribute is no longer supported; versioning
9252 is handled by the package manager.
9253 * Renaming crate imports are now written `extern crate foo as bar`
9254 instead of `extern crate bar = foo`.
9255 * Renaming use statements are now written `use foo as bar` instead
9257 * `let` and `match` bindings and argument names in macros are now
9259 * The new, more efficient, closure types ('unboxed closures') have
9260 been added under a feature gate, 'unboxed_closures'. These will
9261 soon replace the existing closure types, once higher-ranked
9262 trait lifetimes are added to the language.
9263 * `move` has been added as a keyword, for indicating closures
9264 that capture by value.
9265 * Mutation and assignment is no longer allowed in pattern guards.
9266 * Generic structs and enums can now have trait bounds.
9267 * The `Share` trait is now called `Sync` to free up the term
9268 'shared' to refer to 'shared reference' (the default reference
9270 * Dynamically-sized types have been mostly implemented,
9271 unifying the behavior of fat-pointer types with the rest of the
9273 * As part of dynamically-sized types, the `Sized` trait has been
9274 introduced, which qualifying types implement by default, and
9275 which type parameters expect by default. To specify that a type
9276 parameter does not need to be sized, write `<Sized? T>`. Most
9277 types are `Sized`, notable exceptions being unsized arrays
9278 (`[T]`) and trait types.
9279 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9280 * Lifetime bounds can now be applied to type parameters and object
9282 * The old, reference counted GC type, `Gc<T>` which was once
9283 denoted by the `@` sigil, has finally been removed. GC will be
9284 revisited in the future.
9287 * Library documentation has been improved for a number of modules.
9288 * Bit-vectors, collections::bitv has been modernized.
9289 * The url crate is deprecated in favor of
9290 http://github.com/servo/rust-url, which can be installed with
9292 * Most I/O stream types can be cloned and subsequently closed from
9294 * A `std::time::Duration` type has been added for use in I/O
9295 methods that rely on timers, as well as in the 'time' crate's
9296 `Timespec` arithmetic.
9297 * The runtime I/O abstraction layer that enabled the green thread
9298 scheduler to do non-thread-blocking I/O has been removed, along
9299 with the libuv-based implementation employed by the green thread
9300 scheduler. This will greatly simplify the future I/O work.
9301 * `collections::btree` has been rewritten to have a more
9302 idiomatic and efficient design.
9305 * rustdoc output now indicates the stability levels of API's.
9306 * The `--crate-name` flag can specify the name of the crate
9307 being compiled, like `#[crate_name]`.
9308 * The `-C metadata` specifies additional metadata to hash into
9309 symbol names, and `-C extra-filename` specifies additional
9310 information to put into the output filename, for use by the
9311 package manager for versioning.
9312 * debug info generation has continued to improve and should be
9313 more reliable under both gdb and lldb.
9314 * rustc has experimental support for compiling in parallel
9315 using the `-C codegen-units` flag.
9316 * rustc no longer encodes rpath information into binaries by
9320 * Stack usage has been optimized with LLVM lifetime annotations.
9321 * Official Rust binaries on Linux are more compatible with older
9322 kernels and distributions, built on CentOS 5.10.
9325 Version 0.11.0 (2014-07-02)
9326 ==========================
9328 * ~1700 changes, numerous bugfixes
9331 * ~[T] has been removed from the language. This type is superseded by
9333 * ~str has been removed from the language. This type is superseded by
9335 * ~T has been removed from the language. This type is superseded by the
9337 * @T has been removed from the language. This type is superseded by the
9338 standard library's std::gc::Gc<T> type.
9339 * Struct fields are now all private by default.
9340 * Vector indices and shift amounts are both required to be a `uint`
9341 instead of any integral type.
9342 * Byte character, byte string, and raw byte string literals are now all
9343 supported by prefixing the normal literal with a `b`.
9344 * Multiple ABIs are no longer allowed in an ABI string
9345 * The syntax for lifetimes on closures/procedures has been tweaked
9346 slightly: `<'a>|A, B|: 'b + K -> T`
9347 * Floating point modulus has been removed from the language; however it
9348 is still provided by a library implementation.
9349 * Private enum variants are now disallowed.
9350 * The `priv` keyword has been removed from the language.
9351 * A closure can no longer be invoked through a &-pointer.
9352 * The `use foo, bar, baz;` syntax has been removed from the language.
9353 * The transmute intrinsic no longer works on type parameters.
9354 * Statics now allow blocks/items in their definition.
9355 * Trait bounds are separated from objects with + instead of : now.
9356 * Objects can no longer be read while they are mutably borrowed.
9357 * The address of a static is now marked as insignificant unless the
9358 #[inline(never)] attribute is placed it.
9359 * The #[unsafe_destructor] attribute is now behind a feature gate.
9360 * Struct literals are no longer allowed in ambiguous positions such as
9361 if, while, match, and for..in.
9362 * Declaration of lang items and intrinsics are now feature-gated by
9364 * Integral literals no longer default to `int`, and floating point
9365 literals no longer default to `f64`. Literals must be suffixed with an
9366 appropriate type if inference cannot determine the type of the
9368 * The Box<T> type is no longer implicitly borrowed to &mut T.
9369 * Procedures are now required to not capture borrowed references.
9372 * The standard library is now a "facade" over a number of underlying
9373 libraries. This means that development on the standard library should
9374 be speedier due to smaller crates, as well as a clearer line between
9376 * A new library, libcore, lives under the standard library's facade
9377 which is Rust's "0-assumption" library, suitable for embedded and
9378 kernel development for example.
9379 * A regex crate has been added to the standard distribution. This crate
9380 includes statically compiled regular expressions.
9381 * The unwrap/unwrap_err methods on Result require a Show bound for
9382 better error messages.
9383 * The return types of the std::comm primitives have been centralized
9384 around the Result type.
9385 * A number of I/O primitives have gained the ability to time out their
9387 * A number of I/O primitives have gained the ability to close their
9388 reading/writing halves to cancel pending operations.
9389 * Reverse iterator methods have been removed in favor of `rev()` on
9390 their forward-iteration counterparts.
9391 * A bitflags! macro has been added to enable easy interop with C and
9392 management of bit flags.
9393 * A debug_assert! macro is now provided which is disabled when
9394 `--cfg ndebug` is passed to the compiler.
9395 * A graphviz crate has been added for creating .dot files.
9396 * The std::cast module has been migrated into std::mem.
9397 * The std::local_data api has been migrated from freestanding functions
9398 to being based on methods.
9399 * The Pod trait has been renamed to Copy.
9400 * jemalloc has been added as the default allocator for types.
9401 * The API for allocating memory has been changed to use proper alignment
9402 and sized deallocation
9403 * Connecting a TcpStream or binding a TcpListener is now based on a
9404 string address and a u16 port. This allows connecting to a hostname as
9406 * The Reader trait now contains a core method, read_at_least(), which
9407 correctly handles many repeated 0-length reads.
9408 * The process-spawning API is now centered around a builder-style
9410 * The :? printing qualifier has been moved from the standard library to
9411 an external libdebug crate.
9412 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9413 have been renamed to Eq/Ord.
9414 * The select/plural methods have been removed from format!. The escapes
9415 for { and } have also changed from \{ and \} to {{ and }},
9417 * The TaskBuilder API has been re-worked to be a true builder, and
9418 extension traits for spawning native/green tasks have been added.
9421 * All breaking changes to the language or libraries now have their
9422 commit message annotated with `[breaking-change]` to allow for easy
9423 discovery of breaking changes.
9424 * The compiler will now try to suggest how to annotate lifetimes if a
9425 lifetime-related error occurs.
9426 * Debug info continues to be improved greatly with general bug fixes and
9427 better support for situations like link time optimization (LTO).
9428 * Usage of syntax extensions when cross-compiling has been fixed.
9429 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9430 -fdata-sections and --gc-sections has been enabled by default
9431 * The compiler is now stricter about where it will load module files
9432 from when a module is declared via `mod foo;`.
9433 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9434 Syntax extensions are now discovered via a "plugin registrar" type
9435 which will be extended in the future to other various plugins.
9436 * Lints have been restructured to allow for dynamically loadable lints.
9437 * A number of rustdoc improvements:
9438 * The HTML output has been visually redesigned.
9439 * Markdown is now powered by hoedown instead of sundown.
9440 * Searching heuristics have been greatly improved.
9441 * The search index has been reduced in size by a great amount.
9442 * Cross-crate documentation via `pub use` has been greatly improved.
9443 * Primitive types are now hyperlinked and documented.
9444 * Documentation has been moved from static.rust-lang.org/doc to
9446 * A new sandbox, play.rust-lang.org, is available for running and
9447 sharing rust code examples on-line.
9448 * Unused attributes are now more robustly warned about.
9449 * The dead_code lint now warns about unused struct fields.
9450 * Cross-compiling to iOS is now supported.
9451 * Cross-compiling to mipsel is now supported.
9452 * Stability attributes are now inherited by default and no longer apply
9453 to intra-crate usage, only inter-crate usage.
9454 * Error message related to non-exhaustive match expressions have been
9458 Version 0.10 (2014-04-03)
9459 =========================
9461 * ~1500 changes, numerous bugfixes
9464 * A new RFC process is now in place for modifying the language.
9465 * Patterns with `@`-pointers have been removed from the language.
9466 * Patterns with unique vectors (`~[T]`) have been removed from the
9468 * Patterns with unique strings (`~str`) have been removed from the
9470 * `@str` has been removed from the language.
9471 * `@[T]` has been removed from the language.
9472 * `@self` has been removed from the language.
9473 * `@Trait` has been removed from the language.
9474 * Headers on `~` allocations which contain `@` boxes inside the type for
9475 reference counting have been removed.
9476 * The semantics around the lifetimes of temporary expressions have changed,
9477 see #3511 and #11585 for more information.
9478 * Cross-crate syntax extensions are now possible, but feature gated. See
9479 #11151 for more information. This includes both `macro_rules!` macros as
9480 well as syntax extensions such as `format!`.
9481 * New lint modes have been added, and older ones have been turned on to be
9483 * Unnecessary parentheses
9486 * Uppercase variables
9487 * Publicly visible private types
9488 * `#[deriving]` with raw pointers
9489 * Unsafe functions can no longer be coerced to closures.
9490 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9491 * The `#[simd]` attribute is now behind a feature gate.
9492 * Visibility is no longer allowed on `extern crate` statements, and
9493 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9494 * Trailing commas are now allowed in argument lists and tuple patterns.
9495 * The `do` keyword has been removed, it is now a reserved keyword.
9496 * Default type parameters have been implemented, but are feature gated.
9497 * Borrowed variables through captures in closures are now considered soundly.
9498 * `extern mod` is now `extern crate`
9499 * The `Freeze` trait has been removed.
9500 * The `Share` trait has been added for types that can be shared among
9502 * Labels in macros are now hygienic.
9503 * Expression/statement macro invocations can be delimited with `{}` now.
9504 * Treatment of types allowed in `static mut` locations has been tweaked.
9505 * The `*` and `.` operators are now overloadable through the `Deref` and
9507 * `~Trait` and `proc` no longer have `Send` bounds by default.
9508 * Partial type hints are now supported with the `_` type marker.
9509 * An `Unsafe` type was introduced for interior mutability. It is now
9510 considered undefined to transmute from `&T` to `&mut T` without using the
9512 * The #[linkage] attribute was implemented for extern statics/functions.
9513 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9514 * `Pod` was renamed to `Copy`.
9517 * The `libextra` library has been removed. It has now been decomposed into
9518 component libraries with smaller and more focused nuggets of
9519 functionality. The full list of libraries can be found on the
9520 documentation index page.
9521 * std: `std::condition` has been removed. All I/O errors are now propagated
9522 through the `Result` type. In order to assist with error handling, a
9523 `try!` macro for unwrapping errors with an early return and a lint for
9524 unused results has been added. See #12039 for more information.
9525 * std: The `vec` module has been renamed to `slice`.
9526 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9527 This will become the only growable vector in the future.
9528 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9529 are now found at `std::io::BufferedReader` instead of
9530 `std::io::buffered::BufferedReader`.
9531 * std: `print` and `println` are no longer in the prelude, the `print!` and
9532 `println!` macros are intended to be used instead.
9533 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9534 attempts to statically prevent cycles.
9535 * std: The standard distribution is adopting the policy of pushing failure
9536 to the user rather than failing in libraries. Many functions (such as
9537 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9538 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9539 deriving mode: `#[deriving(Show)]`.
9540 * std: `ToStr` is now implemented for all types implementing `Show`.
9541 * std: The formatting trait methods now take `&self` instead of `&T`
9542 * std: The `invert()` method on iterators has been renamed to `rev()`
9543 * std: `std::num` has seen a reduction in the genericity of its traits,
9544 consolidating functionality into a few core traits.
9545 * std: Backtraces are now printed on task failure if the environment
9546 variable `RUST_BACKTRACE` is present.
9547 * std: Naming conventions for iterators have been standardized. More details
9548 can be found on the wiki's style guide.
9549 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9550 still implement the function.
9551 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9552 * std: `assert_approx_eq!` has been removed
9553 * std: The `e` and `E` formatting specifiers for floats have been added to
9554 print them in exponential notation.
9555 * std: The `Times` trait has been removed
9556 * std: Indications of variance and opting out of builtin bounds is done
9557 through marker types in `std::kinds::marker` now
9558 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9559 `#[deriving(Hash)]` is now possible.
9560 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9561 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9562 * std: `Chan::new` is now `channel()`.
9563 * std: A new synchronous channel type has been implemented.
9564 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9565 * std: `hashmap` and `trie` have been moved to `libcollections`
9566 * std: `run` has been rolled into `io::process`
9567 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9568 * std: The equality and comparison traits have seen some reorganization.
9569 * std: `rand` has moved to `librand`.
9570 * std: `to_{lower,upper}case` has been implemented for `char`.
9571 * std: Logging has been moved to `liblog`.
9572 * collections: `HashMap` has been rewritten for higher performance and less
9574 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9575 it can be booted manually. The runtime guide has more information and
9577 * native: All I/O functionality except signals has been implemented.
9578 * green: Task spawning with `libgreen` has been optimized with stack caching
9579 and various trimming of code.
9580 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9581 * sync: The `extra::sync` module has been updated to modern rust (and moved
9582 to the `sync` library), tweaking and improving various interfaces while
9583 dropping redundant functionality.
9584 * sync: A new `Barrier` type has been added to the `sync` library.
9585 * sync: An efficient mutex for native and green tasks has been implemented.
9586 * serialize: The `base64` module has seen some improvement. It treats
9587 newlines better, has non-string error values, and has seen general
9589 * fourcc: A `fourcc!` macro was introduced
9590 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9591 hexadecimal literal.
9594 * `rustpkg` has been deprecated and removed from the main repository. Its
9595 replacement, `cargo`, is under development.
9596 * Nightly builds of rust are now available
9597 * The memory usage of rustc has been improved many times throughout this
9599 * The build process supports disabling rpath support for the rustc binary
9601 * Code generation has improved in some cases, giving more information to the
9602 LLVM optimization passes to enable more extensive optimizations.
9603 * Debuginfo compatibility with lldb on OSX has been restored.
9604 * The master branch is now gated on an android bot, making building for
9605 android much more reliable.
9606 * Output flags have been centralized into one `--emit` flag.
9607 * Crate type flags have been centralized into one `--crate-type` flag.
9608 * Codegen flags have been consolidated behind a `-C` flag.
9609 * Linking against outdated crates now has improved error messages.
9610 * Error messages with lifetimes will often suggest how to annotate the
9611 function to fix the error.
9612 * Many more types are documented in the standard library, and new guides
9614 * Many `rustdoc` improvements:
9615 * code blocks are syntax highlighted.
9616 * render standalone markdown files.
9617 * the --test flag tests all code blocks by default.
9618 * exported macros are displayed.
9619 * re-exported types have their documentation inlined at the location of the
9621 * search works across crates that have been rendered to the same output
9625 Version 0.9 (2014-01-09)
9626 ==========================
9628 * ~1800 changes, numerous bugfixes
9631 * The `float` type has been removed. Use `f32` or `f64` instead.
9632 * A new facility for enabling experimental features (feature gating) has
9633 been added, using the crate-level `#[feature(foo)]` attribute.
9634 * Managed boxes (@) are now behind a feature gate
9635 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9636 standard library's `Gc` or `Rc` types instead.
9637 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9638 * Jumping back to the top of a loop is now done with `continue` instead of
9640 * Strings can no longer be mutated through index assignment.
9641 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9642 hash delimiters, as in `r###"foo"###`.
9643 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9645 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9646 * `@fn`s have been removed.
9647 * `do` only works with procs in order to make it obvious what the cost
9649 * Single-element tuple-like structs can no longer be dereferenced to
9650 obtain the inner value. A more comprehensive solution for overloading
9651 the dereference operator will be provided in the future.
9652 * The `#[link(...)]` attribute has been replaced with
9653 `#[crate_id = "name#vers"]`.
9654 * Empty `impl`s must be terminated with empty braces and may not be
9655 terminated with a semicolon.
9656 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9657 no longer has any special meaning.
9658 * The old `fmt!` string formatting macro has been removed.
9659 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9660 `print!` and `println!`.
9661 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9662 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9663 `extern mod foo = "bar"` instead.
9664 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9665 * Macros can have attributes.
9666 * Macros can expand to items with attributes.
9667 * Macros can expand to multiple items.
9668 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9669 * Comments may be nested.
9670 * Values automatically coerce to trait objects they implement, without
9672 * Enum discriminants are no longer an entire word but as small as needed to
9673 contain all the variants. The `repr` attribute can be used to override
9674 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9675 `#[repr(C)]` to match C enums.
9676 * Non-string literals are not allowed in attributes (they never worked).
9677 * The FFI now supports variadic functions.
9678 * Octal numeric literals, as in `0o7777`.
9679 * The `concat!` syntax extension performs compile-time string concatenation.
9680 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9681 removed as Rust no longer uses segmented stacks.
9682 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9683 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9684 not `*`; ignoring remaining fields of a struct is also done with `..`,
9685 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9686 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9687 * `rustc` supports the "system" calling convention, which defaults to the
9688 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9690 * The `type_overflow` lint (default: warn) checks literals for overflow.
9691 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9692 * The `attribute_usage` lint (default: warn) warns about unknown
9694 * The `unknown_features` lint (default: warn) warns about unknown
9696 * The `dead_code` lint (default: warn) checks for dead code.
9697 * Rust libraries can be linked statically to one another
9698 * `#[link_args]` is behind the `link_args` feature gate.
9699 * Native libraries are now linked with `#[link(name = "foo")]`
9700 * Native libraries can be statically linked to a rust crate
9701 (`#[link(name = "foo", kind = "static")]`).
9702 * Native OS X frameworks are now officially supported
9703 (`#[link(name = "foo", kind = "framework")]`).
9704 * The `#[thread_local]` attribute creates thread-local (not task-local)
9705 variables. Currently behind the `thread_local` feature gate.
9706 * The `return` keyword may be used in closures.
9707 * Types that can be copied via a memcpy implement the `Pod` kind.
9708 * The `cfg` attribute can now be used on struct fields and enum variants.
9711 * std: The `option` and `result` API's have been overhauled to make them
9712 simpler, more consistent, and more composable.
9713 * std: The entire `std::io` module has been replaced with one that is
9714 more comprehensive and that properly interfaces with the underlying
9715 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9717 * std: `io::util` contains a number of useful implementations of
9718 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9719 `ZeroReader`, `TeeReader`.
9720 * std: The reference counted pointer type `extra::rc` moved into std.
9721 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9722 just a wrapper around it).
9723 * std: The `Either` type has been removed.
9724 * std: `fmt::Default` can be implemented for any type to provide default
9725 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9726 * std: The `rand` API continues to be tweaked.
9727 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9728 on failure in gdb, is now named `rust_fail`.
9729 * std: The `each_key` and `each_value` methods on `HashMap` have been
9730 replaced by the `keys` and `values` iterators.
9731 * std: Functions dealing with type size and alignment have moved from the
9732 `sys` module to the `mem` module.
9733 * std: The `path` module was written and API changed.
9734 * std: `str::from_utf8` has been changed to cast instead of allocate.
9735 * std: `starts_with` and `ends_with` methods added to vectors via the
9736 `ImmutableEqVector` trait, which is in the prelude.
9737 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9738 if the index is out of bounds.
9739 * std: Task failure no longer propagates between tasks, as the model was
9740 complex, expensive, and incompatible with thread-based tasks.
9741 * std: The `Any` type can be used for dynamic typing.
9742 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9744 * std: Methods that produce iterators generally do not have an `_iter`
9746 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9747 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9748 * std: `util::ignore` renamed to `prelude::drop`.
9749 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9751 * std: `vec::raw` has seen a lot of cleanup and API changes.
9752 * std: The standard library no longer includes any C++ code, and very
9753 minimal C, eliminating the dependency on libstdc++.
9754 * std: Runtime scheduling and I/O functionality has been factored out into
9755 extensible interfaces and is now implemented by two different crates:
9756 libnative, for native threading and I/O; and libgreen, for green threading
9757 and I/O. This paves the way for using the standard library in more limited
9758 embedded environments.
9759 * std: The `comm` module has been rewritten to be much faster, have a
9760 simpler, more consistent API, and to work for both native and green
9762 * std: All libuv dependencies have been moved into the rustuv crate.
9763 * native: New implementations of runtime scheduling on top of OS threads.
9764 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9766 * green: The green thread scheduler and message passing types are almost
9768 * extra: The `flatpipes` module had bitrotted and was removed.
9769 * extra: All crypto functions have been removed and Rust now has a policy of
9770 not reimplementing crypto in the standard library. In the future crypto
9771 will be provided by external crates with bindings to established libraries.
9772 * extra: `c_vec` has been modernized.
9773 * extra: The `sort` module has been removed. Use the `sort` method on
9777 * The `rust` and `rusti` commands have been removed, due to lack of
9779 * `rustdoc` was completely rewritten.
9780 * `rustdoc` can test code examples in documentation.
9781 * `rustpkg` can test packages with the argument, 'test'.
9782 * `rustpkg` supports arbitrary dependencies, including C libraries.
9783 * `rustc`'s support for generating debug info is improved again.
9784 * `rustc` has better error reporting for unbalanced delimiters.
9785 * `rustc`'s JIT support was removed due to bitrot.
9786 * Executables and static libraries can be built with LTO (-Z lto)
9787 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9791 Version 0.8 (2013-09-26)
9792 ============================
9794 * ~2200 changes, numerous bugfixes
9797 * The `for` loop syntax has changed to work with the `Iterator` trait.
9798 * At long last, unwinding works on Windows.
9799 * Default methods are ready for use.
9800 * Many trait inheritance bugs fixed.
9801 * Owned and borrowed trait objects work more reliably.
9802 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9803 * rustc can omit emission of code for the `debug!` macro if it is passed
9805 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9806 for foo.rs, then foo/mod.rs, and will generate an error when both are
9808 * Strings no longer contain trailing nulls. The new `std::c_str` module
9809 provides new mechanisms for converting to C strings.
9810 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9811 * The FFI has been overhauled such that foreign functions are called directly,
9812 instead of through a stack-switching wrapper.
9813 * Calling a foreign function must be done through a Rust function with the
9814 `#[fixed_stack_segment]` attribute.
9815 * The `externfn!` macro can be used to declare both a foreign function and
9816 a `#[fixed_stack_segment]` wrapper at once.
9817 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9818 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9819 * `priv` is disallowed everywhere except for struct fields and enum variants.
9820 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9821 * `ref` bindings in irrefutable patterns work correctly now.
9822 * `char` is now prevented from containing invalid code points.
9823 * Casting to `bool` is no longer allowed.
9824 * `\0` is now accepted as an escape in chars and strings.
9825 * `yield` is a reserved keyword.
9826 * `typeof` is a reserved keyword.
9827 * Crates may be imported by URL with `extern mod foo = "url";`.
9828 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9829 * Static vectors can be initialized with repeating elements,
9830 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9831 * Static structs can be initialized with functional record update,
9832 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9833 * `cfg!` can be used to conditionally execute code based on the crate
9834 configuration, similarly to `#[cfg(...)]`.
9835 * The `unnecessary_qualification` lint detects unneeded module
9836 prefixes (default: allow).
9837 * Arithmetic operations have been implemented on the SIMD types in
9838 `std::unstable::simd`.
9839 * Exchange allocation headers were removed, reducing memory usage.
9840 * `format!` implements a completely new, extensible, and higher-performance
9841 string formatting system. It will replace `fmt!`.
9842 * `print!` and `println!` write formatted strings (using the `format!`
9843 extension) to stdout.
9844 * `write!` and `writeln!` write formatted strings (using the `format!`
9845 extension) to the new Writers in `std::rt::io`.
9846 * The library section in which a function or static is placed may
9847 be specified with `#[link_section = "..."]`.
9848 * The `proto!` syntax extension for defining bounded message protocols
9850 * `macro_rules!` is hygienic for `let` declarations.
9851 * The `#[export_name]` attribute specifies the name of a symbol.
9852 * `unreachable!` can be used to indicate unreachable code, and fails
9856 * std: Transitioned to the new runtime, written in Rust.
9857 * std: Added an experimental I/O library, `rt::io`, based on the new
9859 * std: A new generic `range` function was added to the prelude, replacing
9860 `uint::range` and friends.
9861 * std: `range_rev` no longer exists. Since range is an iterator it can be
9862 reversed with `range(lo, hi).invert()`.
9863 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9864 renamed to `unwrap_or`.
9865 * std: The `iterator` module was renamed to `iter`.
9866 * std: Integral types now support the `checked_add`, `checked_sub`, and
9867 `checked_mul` operations for detecting overflow.
9868 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9870 * std: Methods are standardizing on conventions for casting methods:
9871 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9873 * std: The `CString` type in `c_str` provides new ways to convert to and
9875 * std: `DoubleEndedIterator` can yield elements in two directions.
9876 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9878 * std: `str::from_bytes` renamed to `str::from_utf8`.
9879 * std: `pop_opt` and `shift_opt` methods added to vectors.
9880 * std: The task-local data interface no longer uses @, and keys are
9881 no longer function pointers.
9882 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9883 * std: Added `SharedPort` to `comm`.
9884 * std: `Eq` has a default method for `ne`; only `eq` is required
9886 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9887 is required in implementations.
9888 * std: `is_utf8` performance is improved, impacting many string functions.
9889 * std: `os::MemoryMap` provides cross-platform mmap.
9890 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9891 are not 'in-bounds' are considered undefined.
9892 * std: Many freestanding functions in `vec` removed in favor of methods.
9893 * std: Many freestanding functions on scalar types removed in favor of
9895 * std: Many options to task builders were removed since they don't make
9896 sense in the new scheduler design.
9897 * std: More containers implement `FromIterator` so can be created by the
9899 * std: More complete atomic types in `unstable::atomics`.
9900 * std: `comm::PortSet` removed.
9901 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9902 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9903 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9904 default implementations.
9905 * std: Various `from_str` functions were removed in favor of a generic
9906 `from_str` which is available in the prelude.
9907 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9908 * extra: `dlist`, the doubly-linked list was modernized.
9909 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9910 * extra: Added `glob` module, replacing `std::os::glob`.
9911 * extra: `rope` was removed.
9912 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9913 * extra: `net`, and `timer` were removed. The experimental replacements
9914 are `std::rt::io::net` and `std::rt::io::timer`.
9915 * extra: Iterators implemented for `SmallIntMap`.
9916 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9917 * extra: `SmallIntSet` removed. Use `BitvSet`.
9918 * extra: Performance of JSON parsing greatly improved.
9919 * extra: `semver` updated to SemVer 2.0.0.
9920 * extra: `term` handles more terminals correctly.
9921 * extra: `dbg` module removed.
9922 * extra: `par` module removed.
9923 * extra: `future` was cleaned up, with some method renames.
9924 * extra: Most free functions in `getopts` were converted to methods.
9927 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9928 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9929 similarly to gcc's `--march` flag.
9930 * rustc's performance compiling small crates is much better.
9931 * rustpkg has received many improvements.
9932 * rustpkg supports git tags as package IDs.
9933 * rustpkg builds into target-specific directories so it can be used for
9935 * The number of concurrent test tasks is controlled by the environment
9936 variable RUST_TEST_TASKS.
9937 * The test harness can now report metrics for benchmarks.
9938 * All tools have man pages.
9939 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9940 * The runtime uses jemalloc for allocations.
9941 * Segmented stacks are temporarily disabled as part of the transition to
9942 the new runtime. Stack overflows are possible!
9943 * A new documentation backend, rustdoc_ng, is available for use. It is
9944 still invoked through the normal `rustdoc` command.
9947 Version 0.7 (2013-07-03)
9948 =======================
9950 * ~2000 changes, numerous bugfixes
9953 * `impl`s no longer accept a visibility qualifier. Put them on methods
9955 * The borrow checker has been rewritten with flow-sensitivity, fixing
9956 many bugs and inconveniences.
9957 * The `self` parameter no longer implicitly means `&'self self`,
9958 and can be explicitly marked with a lifetime.
9959 * Overloadable compound operators (`+=`, etc.) have been temporarily
9960 removed due to bugs.
9961 * The `for` loop protocol now requires `for`-iterators to return `bool`
9962 so they compose better.
9963 * The `Durable` trait is replaced with the `'static` bounds.
9964 * Trait default methods work more often.
9965 * Structs with the `#[packed]` attribute have byte alignment and
9966 no padding between fields.
9967 * Type parameters bound by `Copy` must now be copied explicitly with
9969 * It is now illegal to move out of a dereferenced unsafe pointer.
9970 * `Option<~T>` is now represented as a nullable pointer.
9971 * `@mut` does dynamic borrow checks correctly.
9972 * The `main` function is only detected at the topmost level of the crate.
9973 The `#[main]` attribute is still valid anywhere.
9974 * Struct fields may no longer be mutable. Use inherited mutability.
9975 * The `#[no_send]` attribute makes a type that would otherwise be
9977 * The `#[no_freeze]` attribute makes a type that would otherwise be
9979 * Unbounded recursion will abort the process after reaching the limit
9980 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9981 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9982 are never implicitly copyable.
9983 * `#[static_assert]` makes compile-time assertions about static bools.
9984 * At long last, 'argument modes' no longer exist.
9985 * The rarely used `use mod` statement no longer exists.
9988 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9990 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9991 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9993 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9994 and unsuffixed integer literals.
9997 * The `core` crate was renamed to `std`.
9998 * The `std` crate was renamed to `extra`.
9999 * More and improved documentation.
10000 * std: `iterator` module for external iterator objects.
10001 * Many old-style (internal, higher-order function) iterators replaced by
10002 implementations of `Iterator`.
10003 * std: Many old internal vector and string iterators,
10004 incl. `any`, `all`. removed.
10005 * std: The `finalize` method of `Drop` renamed to `drop`.
10006 * std: The `drop` method now takes `&mut self` instead of `&self`.
10007 * std: The prelude no longer re-exports any modules, only types and traits.
10008 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10009 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10010 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10011 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10012 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10013 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10014 * std: Many types implement `Clone`.
10015 * std: `path` type renamed to `Path`.
10016 * std: `mut` module and `Mut` type removed.
10017 * std: Many standalone functions removed in favor of methods and iterators
10018 in `vec`, `str`. In the future methods will also work as functions.
10019 * std: `reinterpret_cast` removed. Use `transmute`.
10020 * std: ascii string handling in `std::ascii`.
10021 * std: `Rand` is implemented for ~/@.
10022 * std: `run` module for spawning processes overhauled.
10023 * std: Various atomic types added to `unstable::atomic`.
10024 * std: Various types implement `Zero`.
10025 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10026 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10027 * std: Added `os::mkdir_recursive`.
10028 * std: Added `os::glob` function performs filesystems globs.
10029 * std: `FuzzyEq` renamed to `ApproxEq`.
10030 * std: `Map` now defines `pop` and `swap` methods.
10031 * std: `Cell` constructors converted to static methods.
10032 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10033 * extra: `flate` module moved from `std` to `extra`.
10034 * extra: `fileinput` module for iterating over a series of files.
10035 * extra: `Complex` number type and `complex` module.
10036 * extra: `Rational` number type and `rational` module.
10037 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10038 * extra: `term` uses terminfo now, is more correct.
10039 * extra: `arc` functions converted to methods.
10040 * extra: Implementation of fixed output size variations of SHA-2.
10043 * `unused_variables` lint mode for unused variables (default: warn).
10044 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10046 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10048 * `dead_assignment` lint mode for unread variables (default: warn).
10049 * `unnecessary_allocation` lint mode detects some heap allocations that are
10050 immediately borrowed so could be written without allocating (default: warn).
10051 * `missing_doc` lint mode (default: allow).
10052 * `unreachable_code` lint mode (default: warn).
10053 * The `rusti` command has been rewritten and a number of bugs addressed.
10054 * rustc outputs in color on more terminals.
10055 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10056 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10057 * Compiling with `-g` will make the binary record information about
10058 dynamic borrowcheck failures for debugging.
10059 * rustdoc has a nicer stylesheet.
10060 * Various improvements to rustdoc.
10061 * Improvements to rustpkg (see the detailed release notes).
10064 Version 0.6 (2013-04-03)
10065 ========================
10067 * ~2100 changes, numerous bugfixes
10070 * The self type parameter in traits is now spelled `Self`
10071 * The `self` parameter in trait and impl methods must now be explicitly
10072 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10073 * Static methods no longer require the `static` keyword and instead
10074 are distinguished by the lack of a `self` parameter
10075 * Replaced the `Durable` trait with the `'static` lifetime
10076 * The old closure type syntax with the trailing sigil has been
10077 removed in favor of the more consistent leading sigil
10078 * `super` is a keyword, and may be prefixed to paths
10079 * Trait bounds are separated with `+` instead of whitespace
10080 * Traits are implemented with `impl Trait for Type`
10081 instead of `impl Type: Trait`
10082 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10083 * The `export` keyword has finally been removed
10084 * The `move` keyword has been removed (see "Semantic changes")
10085 * The interior mutability qualifier on vectors, `[mut T]`, has been
10086 removed. Use `&mut [T]`, etc.
10087 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10088 * `fail` is no longer a keyword. Use `fail!()`
10089 * `assert` is no longer a keyword. Use `assert!()`
10090 * `log` is no longer a keyword. use `debug!`, etc.
10091 * 1-tuples may be represented as `(T,)`
10092 * Struct fields may no longer be `mut`. Use inherited mutability,
10093 `@mut T`, `core::mut` or `core::cell`
10094 * `extern mod { ... }` is no longer valid syntax for foreign
10095 function modules. Use extern blocks: `extern { ... }`
10096 * Newtype enums removed. Use tuple-structs.
10097 * Trait implementations no longer support visibility modifiers
10098 * Pattern matching over vectors improved and expanded
10099 * `const` renamed to `static` to correspond to lifetime name,
10100 and make room for future `static mut` unsafe mutable globals.
10101 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10102 * `Clone` implementations can be automatically generated with
10103 `#[deriving(Clone)]`
10104 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10105 instead of `foo as Bar`.
10106 * Fixed length vector types are now written as `[int, .. 3]`
10107 instead of `[int * 3]`.
10108 * Fixed length vector types can express the length as a constant
10109 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10112 * Types with owned pointers or custom destructors move by default,
10113 eliminating the `move` keyword
10114 * All foreign functions are considered unsafe
10115 * &mut is now unaliasable
10116 * Writes to borrowed @mut pointers are prevented dynamically
10118 * The name of the main function can be customized using #[main]
10119 * The default type of an inferred closure is &fn instead of @fn
10120 * `use` statements may no longer be "chained" - they cannot import
10121 identifiers imported by previous `use` statements
10122 * `use` statements are crate relative, importing from the "top"
10123 of the crate by default. Paths may be prefixed with `super::`
10124 or `self::` to change the search behavior.
10125 * Method visibility is inherited from the implementation declaration
10126 * Structural records have been removed
10127 * Many more types can be used in static items, including enums
10128 'static-lifetime pointers and vectors
10129 * Pattern matching over vectors improved and expanded
10130 * Typechecking of closure types has been overhauled to
10131 improve inference and eliminate unsoundness
10132 * Macros leave scope at the end of modules, unless that module is
10133 tagged with #[macro_escape]
10136 * Added big integers to `std::bigint`
10137 * Removed `core::oldcomm` module
10138 * Added pipe-based `core::comm` module
10139 * Numeric traits have been reorganized under `core::num`
10140 * `vec::slice` finally returns a slice
10141 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10142 * Containers reorganized around traits in `core::container`
10143 * `core::dvec` removed, `~[T]` is a drop-in replacement
10144 * `core::send_map` renamed to `core::hashmap`
10145 * `std::map` removed; replaced with `core::hashmap`
10146 * `std::treemap` reimplemented as an owned balanced tree
10147 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10148 * `core::trie` added as a fast ordered map for integer keys
10149 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10150 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10151 overload the comparison operators, whereas `TotalOrd` is used
10152 by certain container types
10155 * Replaced the 'cargo' package manager with 'rustpkg'
10156 * Added all-purpose 'rust' tool
10157 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10158 * rustc now *attempts* to offer spelling suggestions
10159 * Improved support for ARM and Android
10160 * Preliminary MIPS backend
10161 * Improved foreign function ABI implementation for x86, x86_64
10162 * Various memory usage improvements
10163 * Rust code may be embedded in foreign code under limited circumstances
10164 * Inline assembler supported by new asm!() syntax extension.
10167 Version 0.5 (2012-12-21)
10168 ===========================
10170 * ~900 changes, numerous bugfixes
10173 * Removed `<-` move operator
10174 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10175 * Removed old fixed length vector syntax - `[T]/N`
10176 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10177 * Macros may now expand to items and statements
10178 * `a.b()` is always parsed as a method call, never as a field projection
10179 * `Eq` and `IterBytes` implementations can be automatically generated
10180 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10181 * Removed the special crate language for `.rc` files
10182 * Function arguments may consist of any irrefutable pattern
10185 * `&` and `~` pointers may point to objects
10186 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10187 * Enum variants may be structs
10188 * Destructors can be added to all nominal types with the Drop trait
10189 * Structs and nullary enum variants may be constants
10190 * Values that cannot be implicitly copied are now automatically moved
10191 without writing `move` explicitly
10192 * `&T` may now be coerced to `*T`
10193 * Coercions happen in `let` statements as well as function calls
10194 * `use` statements now take crate-relative paths
10195 * The module and type namespaces have been merged so that static
10196 method names can be resolved under the trait in which they are
10199 * Improved support for language features
10200 * Trait inheritance works in many scenarios
10201 * More support for explicit self arguments in methods - `self`, `&self`
10202 `@self`, and `~self` all generally work as expected
10203 * Static methods work in more situations
10204 * Experimental: Traits may declare default methods for the implementations
10208 * New condition handling system in `core::condition`
10209 * Timsort added to `std::sort`
10210 * New priority queue, `std::priority_queue`
10211 * Pipes for serializable types, `std::flatpipes'
10212 * Serialization overhauled to be trait-based
10213 * Expanded `getopts` definitions
10214 * Moved futures to `std`
10215 * More functions are pure now
10216 * `core::comm` renamed to `oldcomm`. Still deprecated
10217 * `rustdoc` and `cargo` are libraries now
10220 * Added a preliminary REPL, `rusti`
10221 * License changed from MIT to dual MIT/APL2
10224 Version 0.4 (2012-10-15)
10225 ==========================
10227 * ~2000 changes, numerous bugfixes
10230 * All keywords are now strict and may not be used as identifiers anywhere
10231 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10232 'of', 'with', 'to', 'class'.
10233 * Classes are replaced with simpler structs
10234 * Explicit method self types
10235 * `ret` became `return` and `alt` became `match`
10236 * `import` is now `use`; `use is now `extern mod`
10237 * `extern mod { ... }` is now `extern { ... }`
10238 * `use mod` is the recommended way to import modules
10239 * `pub` and `priv` replace deprecated export lists
10240 * The syntax of `match` pattern arms now uses fat arrow (=>)
10241 * `main` no longer accepts an args vector; use `os::args` instead
10244 * Trait implementations are now coherent, ala Haskell typeclasses
10245 * Trait methods may be static
10246 * Argument modes are deprecated
10247 * Borrowed pointers are much more mature and recommended for use
10248 * Strings and vectors in the static region are stored in constant memory
10249 * Typestate was removed
10250 * Resolution rewritten to be more reliable
10251 * Support for 'dual-mode' data structures (freezing and thawing)
10254 * Most binary operators can now be overloaded via the traits in
10256 * `std::net::url` for representing URLs
10257 * Sendable hash maps in `core::send_map`
10258 * `core::task' gained a (currently unsafe) task-local storage API
10261 * An efficient new intertask communication primitive called the pipe,
10262 along with a number of higher-level channel types, in `core::pipes`
10263 * `std::arc`, an atomically reference counted, immutable, shared memory
10265 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10266 * Futures are now based on pipes and sendable
10267 * More robust linked task failure
10268 * Improved task builder API
10271 * Improved error reporting
10272 * Preliminary JIT support
10273 * Preliminary work on precise GC
10274 * Extensive architectural improvements to rustc
10275 * Begun a transition away from buggy C++-based reflection (shape) code to
10276 Rust-based (visitor) code
10277 * All hash functions and tables converted to secure, randomized SipHash
10280 Version 0.3 (2012-07-12)
10281 ========================
10283 * ~1900 changes, numerous bugfixes
10285 * New coding conveniences
10286 * Integer-literal suffix inference
10287 * Per-item control over warnings, errors
10288 * #[cfg(windows)] and #[cfg(unix)] attributes
10289 * Documentation comments
10290 * More compact closure syntax
10291 * 'do' expressions for treating higher-order functions as
10293 * *-patterns (wildcard extended to all constructor fields)
10296 * Name resolution pass and exhaustiveness checker rewritten
10297 * Region pointers and borrow checking supersede alias
10299 * Init-ness checking is now provided by a region-based liveness
10300 pass instead of the typestate pass; same for last-use analysis
10301 * Extensive work on region pointers
10303 * Experimental new language features
10304 * Slices and fixed-size, interior-allocated vectors
10305 * #!-comments for lang versioning, shell execution
10306 * Destructors and iface implementation for classes;
10307 type-parameterized classes and class methods
10308 * 'const' type kind for types that can be used to implement
10309 shared-memory concurrency patterns
10313 * Removal of various obsolete features
10314 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10315 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10317 * Constructs: do-while loops ('do' repurposed), fn binding,
10318 resources (replaced by destructors)
10320 * Compiler reorganization
10321 * Syntax-layer of compiler split into separate crate
10322 * Clang (from LLVM project) integrated into build
10323 * Typechecker split into sub-modules
10326 * New time functions
10327 * Extension methods for many built-in types
10328 * Arc: atomic-refcount read-only / exclusive-use shared cells
10329 * Par: parallel map and search routines
10330 * Extensive work on libuv interface
10331 * Much vector code moved to libraries
10332 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10333 #include, #include_str, #include_bin
10335 * Tool improvements
10336 * Cargo automatically resolves dependencies
10339 Version 0.2 (2012-03-29)
10340 =========================
10342 * >1500 changes, numerous bugfixes
10344 * New docs and doc tooling
10346 * New port: FreeBSD x86_64
10348 * Compilation model enhancements
10349 * Generics now specialized, multiply instantiated
10350 * Functions now inlined across separate crates
10352 * Scheduling, stack and threading fixes
10353 * Noticeably improved message-passing performance
10354 * Explicit schedulers
10358 * Experimental new language features
10359 * Operator overloading
10363 * Various language extensions
10364 * C-callback function types: 'crust fn ...'
10365 * Infinite-loop construct: 'loop { ... }'
10366 * Shorten 'mutable' to 'mut'
10367 * Required mutable-local qualifier: 'let mut ...'
10368 * Basic glob-exporting: 'export foo::*;'
10369 * Alt now exhaustive, 'alt check' for runtime-checked
10370 * Block-function form of 'for' loop, with 'break' and 'ret'.
10373 * AST quasi-quote syntax extension
10374 * Revived libuv interface
10375 * New modules: core::{future, iter}, std::arena
10376 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10377 * Extensive cleanup, regularization in libstd, libcore
10380 Version 0.1 (2012-01-20)
10381 ===============================
10383 * Most language features work, including:
10384 * Unique pointers, unique closures, move semantics
10385 * Interface-constrained generics
10386 * Static interface dispatch
10388 * Multithread task scheduling
10389 * Typestate predicates
10390 * Failure unwinding, destructors
10391 * Pattern matching and destructuring assignment
10392 * Lightweight block-lambda syntax
10393 * Preliminary macro-by-example
10395 * Compiler works with the following configurations:
10396 * Linux: x86 and x86_64 hosts and targets
10397 * macOS: x86 and x86_64 hosts and targets
10398 * Windows: x86 hosts and targets
10400 * Cross compilation / multi-target configuration supported.
10402 * Preliminary API-documentation and package-management tools included.
10406 * Documentation is incomplete.
10408 * Performance is below intended target.
10410 * Standard library APIs are subject to extensive change, reorganization.
10412 * Language-level versioning is not yet operational - future code will
10413 break unexpectedly.