1 Version 1.54.0 (2021-07-29)
2 ============================
5 -----------------------
7 - [You can now use macros for values in built-in attribute macros.][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 - [You can now use multiple generic lifetimes with `impl Trait` where the
23 lifetimes don't explicitly outlive another.][84701] In code this means
24 that you can now have `impl Trait<'a, 'b>` where as before you could
25 only have `impl Trait<'a, 'b> where 'b: 'a`.
28 -----------------------
30 - [Rustc will now search for custom JSON targets in
31 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
32 directory.][83800] You can find your sysroot directory by running
33 `rustc --print sysroot`.
34 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
35 - [You can now use `#[target_feature]` on safe functions when targeting
36 WebAssembly platforms.][84988]
37 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
38 - [Added tier 3\* support for `bpfel-unknown-none`
39 and `bpfeb-unknown-none`.][79608]
41 \* Refer to Rust's [platform support page][platform-support-doc] for more
42 information on Rust's tiered platform support.
45 -----------------------
47 - [`panic::panic_any` will now `#[track_caller]`.][85745]
48 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
49 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
50 - [The implementations of vendor intrinsics in core::arch have been
51 significantly refactored.][83278] The main user-visible changes are
52 a 50% reduction in the size of libcore.rlib and stricter validation
53 of constant operands passed to intrinsics. The latter is technically
54 a breaking change, but allows Rust to more closely match the C vendor
60 - [`BTreeMap::into_keys`]
61 - [`BTreeMap::into_values`]
62 - [`HashMap::into_keys`]
63 - [`HashMap::into_values`]
65 - [`VecDeque::binary_search`]
66 - [`VecDeque::binary_search_by`]
67 - [`VecDeque::binary_search_by_key`]
68 - [`VecDeque::partition_point`]
73 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
74 the dependency graph.][cargo/9520]
75 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
76 in the tree ][cargo/9499]
77 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
78 macro dependencies.][cargo/9488]
79 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
80 This variable points to a directory that integration tests and benches
81 can use as a "scratchpad" for testing filesystem operations.
85 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
86 - [Previously unsound code is no longer permitted where different constructors in branches
87 could require different lifetimes.][85574]
88 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
89 than before and may reject some previously accepted code.
90 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
91 when compiled with `codegen-units = 1`.][86063]
93 [85574]: https://github.com/rust-lang/rust/issues/85574
94 [86831]: https://github.com/rust-lang/rust/issues/86831
95 [86063]: https://github.com/rust-lang/rust/issues/86063
96 [86831]: https://github.com/rust-lang/rust/issues/86831
97 [79608]: https://github.com/rust-lang/rust/pull/79608
98 [84988]: https://github.com/rust-lang/rust/pull/84988
99 [84701]: https://github.com/rust-lang/rust/pull/84701
100 [84072]: https://github.com/rust-lang/rust/pull/84072
101 [85745]: https://github.com/rust-lang/rust/pull/85745
102 [84744]: https://github.com/rust-lang/rust/pull/84744
103 [85078]: https://github.com/rust-lang/rust/pull/85078
104 [84717]: https://github.com/rust-lang/rust/pull/84717
105 [83800]: https://github.com/rust-lang/rust/pull/83800
106 [83366]: https://github.com/rust-lang/rust/pull/83366
107 [83278]: https://github.com/rust-lang/rust/pull/83278
108 [85292]: https://github.com/rust-lang/rust/pull/85292
109 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
110 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
111 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
112 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
113 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
114 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
115 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
116 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
117 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
118 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
119 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
121 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
123 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
125 Version 1.53.0 (2021-06-17)
126 ============================
129 -----------------------
130 - [You can now use unicode for identifiers.][83799] This allows multilingual
131 identifiers but still doesn't allow glyphs that are not considered characters
132 such as `◆` or `🦀`. More specifically you can now use any identifier that
133 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
134 is the same standard as languages like Python, however Rust uses NFC
135 normalization which may be different from other languages.
136 - [You can now specify "or patterns" inside pattern matches.][79278]
137 Previously you could only use `|` (OR) on complete patterns. E.g.
141 matches!(x, Some(1) | Some(2));
143 matches!(x, Some(1 | 2));
145 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
146 has the same semantics as the `:pat` matcher. This is to allow `:pat`
147 to change semantics to being a pattern fragment in a future edition.
150 -----------------------
151 - [Updated the minimum external LLVM version to LLVM 10.][83387]
152 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
153 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
155 \* Refer to Rust's [platform support page][platform-support-doc] for more
156 information on Rust's tiered platform support.
159 -----------------------
160 - [Abort messages will now forward to `android_set_abort_message` on
161 Android platforms when available.][81469]
162 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
163 - [Arrays of any length now implement `IntoIterator`.][84147]
164 Currently calling `.into_iter()` as a method on an array will
165 return `impl Iterator<Item=&T>`, but this may change in a
166 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
167 directly on arrays will provide `impl Iterator<Item=T>` as expected.
168 - [`leading_zeros`, and `trailing_zeros` are now available on all
169 `NonZero` integer types.][84082]
170 - [`{f32, f64}::from_str` now parse and print special values
171 (`NaN`, `-0`) according to IEEE 754.][78618]
172 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
173 - [Add the `BITS` associated constant to all numeric types.][82565]
177 - [`AtomicBool::fetch_update`]
178 - [`AtomicPtr::fetch_update`]
179 - [`BTreeMap::retain`]
180 - [`BTreeSet::retain`]
181 - [`BufReader::seek_relative`]
182 - [`DebugStruct::non_exhaustive`]
185 - [`Duration::is_zero`]
186 - [`Duration::saturating_add`]
187 - [`Duration::saturating_mul`]
188 - [`Duration::saturating_sub`]
189 - [`ErrorKind::Unsupported`]
191 - [`Ordering::is_eq`]
192 - [`Ordering::is_ge`]
193 - [`Ordering::is_gt`]
194 - [`Ordering::is_le`]
195 - [`Ordering::is_lt`]
196 - [`Ordering::is_ne`]
197 - [`OsStr::is_ascii`]
198 - [`OsStr::make_ascii_lowercase`]
199 - [`OsStr::make_ascii_uppercase`]
200 - [`OsStr::to_ascii_lowercase`]
201 - [`OsStr::to_ascii_uppercase`]
202 - [`Peekable::peek_mut`]
203 - [`Rc::decrement_strong_count`]
204 - [`Rc::increment_strong_count`]
205 - [`Vec::extend_from_within`]
206 - [`array::from_mut`]
207 - [`array::from_ref`]
208 - [`cmp::max_by_key`]
210 - [`cmp::min_by_key`]
212 - [`f32::is_subnormal`]
213 - [`f64::is_subnormal`]
216 -----------------------
217 - [Cargo now supports git repositories where the default `HEAD` branch is not
218 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
219 which can handle default branches correctly.
220 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
221 - [The `authors` field is no longer included in `Cargo.toml` for new
222 projects.][cargo/9282]
225 -----------------------
226 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
227 without hyperlinks.][81764]
231 - [Implement token-based handling of attributes during expansion][82608]
232 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
233 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
234 to confusion and potential security vulnerabilities and [is no
235 longer recommended][ietf6943].
236 - [The added `BITS` constant may conflict with external definitions.][85667]
237 In particular, this was known to be a problem in the `lexical-core` crate,
238 but they have published fixes for semantic versions 0.4 through 0.7. To
239 update this dependency alone, use `cargo update -p lexical-core`.
240 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
244 These changes provide no direct user facing benefits, but represent significant
245 improvements to the internals and overall performance of rustc and
248 - [Rework the `std::sys::windows::alloc` implementation.][83065]
249 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
250 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
251 - [Rework rustdoc const type][82873]
253 [85667]: https://github.com/rust-lang/rust/pull/85667
254 [83386]: https://github.com/rust-lang/rust/pull/83386
255 [82771]: https://github.com/rust-lang/rust/pull/82771
256 [84147]: https://github.com/rust-lang/rust/pull/84147
257 [84082]: https://github.com/rust-lang/rust/pull/84082
258 [83799]: https://github.com/rust-lang/rust/pull/83799
259 [83681]: https://github.com/rust-lang/rust/pull/83681
260 [83652]: https://github.com/rust-lang/rust/pull/83652
261 [83387]: https://github.com/rust-lang/rust/pull/83387
262 [82873]: https://github.com/rust-lang/rust/pull/82873
263 [82864]: https://github.com/rust-lang/rust/pull/82864
264 [82608]: https://github.com/rust-lang/rust/pull/82608
265 [82565]: https://github.com/rust-lang/rust/pull/82565
266 [80525]: https://github.com/rust-lang/rust/pull/80525
267 [79278]: https://github.com/rust-lang/rust/pull/79278
268 [78618]: https://github.com/rust-lang/rust/pull/78618
269 [77704]: https://github.com/rust-lang/rust/pull/77704
270 [83941]: https://github.com/rust-lang/rust/pull/83941
271 [83065]: https://github.com/rust-lang/rust/pull/83065
272 [81764]: https://github.com/rust-lang/rust/pull/81764
273 [81469]: https://github.com/rust-lang/rust/pull/81469
274 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
275 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
276 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
277 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
278 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
279 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
280 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
281 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
282 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
283 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
284 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
285 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
286 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
287 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
288 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
289 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
290 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
291 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
292 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
293 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
294 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
295 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
296 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
297 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
298 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
299 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
300 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
301 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
302 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
303 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
304 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
305 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
306 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
307 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
308 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
309 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
310 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
311 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
312 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
313 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
314 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
315 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
318 Version 1.52.1 (2021-05-10)
319 ============================
321 This release disables incremental compilation, unless the user has explicitly
322 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
324 This is due to the widespread, and frequently occuring, breakage encountered by
325 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
326 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
327 newly added incremental verification are still present in past stable versions,
328 and are not yet fixed on any channel. These bugs can lead to miscompilation of
331 These problems only affect incremental builds, so release builds with Cargo
332 should not be affected unless the user has explicitly opted into incremental.
333 Debug and check builds are affected.
335 See [84970] for more details.
337 [84970]: https://github.com/rust-lang/rust/issues/84970
339 Version 1.52.0 (2021-05-06)
340 ============================
344 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
345 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
346 is allowed by default, and may become a warning or hard error in a
348 - [You can now cast mutable references to arrays to a pointer of the same type as
353 - [Upgraded the default LLVM to LLVM 12.][81451]
355 Added tier 3\* support for the following targets.
357 - [`s390x-unknown-linux-musl`][82166]
358 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
359 - [`powerpc-unknown-openbsd`][82733]
361 \* Refer to Rust's [platform support page][platform-support-doc] for more
362 information on Rust's tiered platform support.
366 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
367 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
368 - [`Arc<impl Error>` now implements `error::Error`.][80553]
369 - [All integer division and remainder operations are now `const`.][80962]
373 - [`Arguments::as_str`]
375 - [`char::REPLACEMENT_CHARACTER`]
376 - [`char::UNICODE_VERSION`]
377 - [`char::decode_utf16`]
378 - [`char::from_digit`]
379 - [`char::from_u32_unchecked`]
381 - [`slice::partition_point`]
382 - [`str::rsplit_once`]
383 - [`str::split_once`]
385 The following previously stable APIs are now `const`.
388 - [`char::len_utf16`]
389 - [`char::to_ascii_uppercase`]
390 - [`char::to_ascii_lowercase`]
391 - [`char::eq_ignore_ascii_case`]
392 - [`u8::to_ascii_uppercase`]
393 - [`u8::to_ascii_lowercase`]
394 - [`u8::eq_ignore_ascii_case`]
398 - [Rustdoc lints are now treated as a tool lint, meaning that
399 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
400 Using the old style is still allowed, and will become a warning in
402 - [Rustdoc now supports argument files.][82261]
403 - [Rustdoc now generates smart punctuation for documentation.][79423]
404 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
412 - [You can now pass multiple filters to tests.][81356] E.g.
413 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
414 - [Rustup now distributes PDB symbols for the `std` library on Windows,
415 allowing you to see `std` symbols when debugging.][82218]
419 These changes provide no direct user facing benefits, but represent significant
420 improvements to the internals and overall performance of rustc and
423 - [Check the result cache before the DepGraph when ensuring queries][81855]
424 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
425 - [Only store a LocalDefId in some HIR nodes][81611]
426 - [Store HIR attributes in a side table][79519]
430 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
431 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
432 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
433 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
434 languages in code blocks.][78429]
435 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
436 - [Changes in how proc macros handle whitespace may lead to panics when used
437 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
438 - [Turn `#[derive]` into a regular macro attribute][79078]
440 [84136]: https://github.com/rust-lang/rust/issues/84136
441 [80763]: https://github.com/rust-lang/rust/pull/80763
442 [82166]: https://github.com/rust-lang/rust/pull/82166
443 [82121]: https://github.com/rust-lang/rust/pull/82121
444 [81879]: https://github.com/rust-lang/rust/pull/81879
445 [82261]: https://github.com/rust-lang/rust/pull/82261
446 [82218]: https://github.com/rust-lang/rust/pull/82218
447 [82216]: https://github.com/rust-lang/rust/pull/82216
448 [82202]: https://github.com/rust-lang/rust/pull/82202
449 [81855]: https://github.com/rust-lang/rust/pull/81855
450 [81766]: https://github.com/rust-lang/rust/pull/81766
451 [81744]: https://github.com/rust-lang/rust/pull/81744
452 [81611]: https://github.com/rust-lang/rust/pull/81611
453 [81479]: https://github.com/rust-lang/rust/pull/81479
454 [81451]: https://github.com/rust-lang/rust/pull/81451
455 [81356]: https://github.com/rust-lang/rust/pull/81356
456 [80962]: https://github.com/rust-lang/rust/pull/80962
457 [80553]: https://github.com/rust-lang/rust/pull/80553
458 [80527]: https://github.com/rust-lang/rust/pull/80527
459 [79519]: https://github.com/rust-lang/rust/pull/79519
460 [79423]: https://github.com/rust-lang/rust/pull/79423
461 [79208]: https://github.com/rust-lang/rust/pull/79208
462 [78429]: https://github.com/rust-lang/rust/pull/78429
463 [82733]: https://github.com/rust-lang/rust/pull/82733
464 [82594]: https://github.com/rust-lang/rust/pull/82594
465 [79078]: https://github.com/rust-lang/rust/pull/79078
466 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
467 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
468 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
469 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
470 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
471 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
472 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
473 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
474 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
475 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
476 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
477 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
478 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
479 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
480 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
481 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
482 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
483 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
484 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
485 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
486 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
487 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
489 Version 1.51.0 (2021-03-25)
490 ============================
494 - [You can now parameterize items such as functions, traits, and `struct`s by constant
495 values in addition to by types and lifetimes.][79135] Also known as "const generics"
496 E.g. you can now write the following. Note: Only values of primitive integers,
497 `bool`, or `char` types are currently permitted.
499 struct GenericArray<T, const LENGTH: usize> {
503 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
504 const fn last(&self) -> Option<&T> {
508 Some(&self.inner[LENGTH - 1])
518 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
519 This option controls whether debug information is split across multiple files
520 or packed into a single file. **Note** This option is unstable on other platforms.
521 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
522 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
523 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
524 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
526 \* Refer to Rust's [platform support page][platform-support-doc] for more
527 information on Rust's tiered platform support.
532 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
533 - [`str` now implements `AsMut<str>`.][80279]
534 - [`u64` and `u128` now implement `From<char>`.][79502]
535 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
536 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
537 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
538 - [`io::Empty` now implements `io::Seek`.][78044]
539 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
540 `T: ?Sized` types.][80764]
541 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
547 - [`Arc::decrement_strong_count`]
548 - [`Arc::increment_strong_count`]
549 - [`Once::call_once_force`]
550 - [`Peekable::next_if_eq`]
551 - [`Peekable::next_if`]
552 - [`Seek::stream_position`]
553 - [`array::IntoIter`]
554 - [`panic::panic_any`]
556 - [`ptr::addr_of_mut!`]
557 - [`slice::fill_with`]
558 - [`slice::split_inclusive_mut`]
559 - [`slice::split_inclusive`]
560 - [`slice::strip_prefix`]
561 - [`slice::strip_suffix`]
562 - [`str::split_inclusive`]
563 - [`sync::OnceState`]
565 - [`VecDeque::range`]
566 - [`VecDeque::range_mut`]
570 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
571 codegen option.][cargo/9112]
572 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
573 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
574 to avoid unifying features of dependencies where that unification could be unwanted.
575 Such as using the same dependency with a `std` feature in a build scripts and
576 proc-macros, while using the `no-std` feature in the final binary. See the
577 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
582 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
583 - [You can now provide a `--default-theme` flag which sets the default theme to use for
584 documentation.][79642]
586 Various improvements to intra-doc links:
588 - [You can link to non-path primitives such as `slice`.][80181]
589 - [You can link to associated items.][74489]
590 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
594 - [You can now pass `--include-ignored` to tests (e.g. with
595 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
600 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
601 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
603 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
604 for the distributed artifacts.][81521]
605 - `armv5te-unknown-linux-gnueabi`
606 - `sparc64-unknown-linux-gnu`
607 - `thumbv7neon-unknown-linux-gnueabihf`
608 - `armv7-unknown-linux-gnueabi`
609 - `x86_64-unknown-linux-gnux32`
610 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
615 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
617 [79135]: https://github.com/rust-lang/rust/pull/79135
618 [74489]: https://github.com/rust-lang/rust/pull/74489
619 [76934]: https://github.com/rust-lang/rust/pull/76934
620 [79570]: https://github.com/rust-lang/rust/pull/79570
621 [80181]: https://github.com/rust-lang/rust/pull/80181
622 [79642]: https://github.com/rust-lang/rust/pull/79642
623 [80945]: https://github.com/rust-lang/rust/pull/80945
624 [80279]: https://github.com/rust-lang/rust/pull/80279
625 [80053]: https://github.com/rust-lang/rust/pull/80053
626 [79502]: https://github.com/rust-lang/rust/pull/79502
627 [75180]: https://github.com/rust-lang/rust/pull/75180
628 [79135]: https://github.com/rust-lang/rust/pull/79135
629 [81521]: https://github.com/rust-lang/rust/pull/81521
630 [80968]: https://github.com/rust-lang/rust/pull/80968
631 [80959]: https://github.com/rust-lang/rust/pull/80959
632 [80718]: https://github.com/rust-lang/rust/pull/80718
633 [80653]: https://github.com/rust-lang/rust/pull/80653
634 [80579]: https://github.com/rust-lang/rust/pull/80579
635 [79998]: https://github.com/rust-lang/rust/pull/79998
636 [78044]: https://github.com/rust-lang/rust/pull/78044
637 [81455]: https://github.com/rust-lang/rust/pull/81455
638 [80764]: https://github.com/rust-lang/rust/pull/80764
639 [80749]: https://github.com/rust-lang/rust/pull/80749
640 [80662]: https://github.com/rust-lang/rust/pull/80662
641 [79134]: https://github.com/rust-lang/rust/pull/79134
642 [80966]: https://github.com/rust-lang/rust/pull/80966
643 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
644 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
645 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
646 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
647 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
648 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
649 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
650 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
651 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
652 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
653 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
654 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
655 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
656 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
657 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
658 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
659 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
660 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
661 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
662 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
663 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
664 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
665 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
667 Version 1.50.0 (2021-02-11)
668 ============================
671 -----------------------
672 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
673 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
674 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
677 -----------------------
678 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
679 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
680 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
681 - [Dropped support for all cloudabi targets.][78439]
683 \* Refer to Rust's [platform support page][platform-support-doc] for more
684 information on Rust's tiered platform support.
687 -----------------------
689 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
690 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
691 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
692 This value cannot be a valid file descriptor, and now means `Option<File>` takes
693 up the same amount of space as `File`.
699 - [`btree_map::Entry::or_insert_with_key`]
702 - [`hash_map::Entry::or_insert_with_key`]
706 - [`UnsafeCell::get_mut`]
708 The following previously stable methods are now `const`.
710 - [`IpAddr::is_ipv4`]
711 - [`IpAddr::is_ipv6`]
712 - [`IpAddr::is_unspecified`]
713 - [`IpAddr::is_loopback`]
714 - [`IpAddr::is_multicast`]
715 - [`Ipv4Addr::octets`]
716 - [`Ipv4Addr::is_loopback`]
717 - [`Ipv4Addr::is_private`]
718 - [`Ipv4Addr::is_link_local`]
719 - [`Ipv4Addr::is_multicast`]
720 - [`Ipv4Addr::is_broadcast`]
721 - [`Ipv4Addr::is_documentation`]
722 - [`Ipv4Addr::to_ipv6_compatible`]
723 - [`Ipv4Addr::to_ipv6_mapped`]
724 - [`Ipv6Addr::segments`]
725 - [`Ipv6Addr::is_unspecified`]
726 - [`Ipv6Addr::is_loopback`]
727 - [`Ipv6Addr::is_multicast`]
728 - [`Ipv6Addr::to_ipv4`]
731 - [`Layout::from_size_align`]
732 - `pow` for all integer types.
733 - `checked_pow` for all integer types.
734 - `saturating_pow` for all integer types.
735 - `wrapping_pow` for all integer types.
736 - `next_power_of_two` for all unsigned integer types.
737 - `checked_next_power_of_two` for all unsigned integer types.
740 -----------------------
742 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
743 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
744 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
745 contents of that directory for changes.][cargo/8973]
746 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
751 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
752 - [Running tests will now print the total time taken to execute.][75752]
757 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
758 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
759 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
760 unhygenic `macro_rules!` macros.][79472]
761 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
762 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
763 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
764 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
765 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
766 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
768 [74989]: https://github.com/rust-lang/rust/pull/74989
769 [79261]: https://github.com/rust-lang/rust/pull/79261
770 [79896]: https://github.com/rust-lang/rust/pull/79896
771 [79484]: https://github.com/rust-lang/rust/pull/79484
772 [79472]: https://github.com/rust-lang/rust/pull/79472
773 [79270]: https://github.com/rust-lang/rust/pull/79270
774 [79003]: https://github.com/rust-lang/rust/pull/79003
775 [78864]: https://github.com/rust-lang/rust/pull/78864
776 [78636]: https://github.com/rust-lang/rust/pull/78636
777 [78439]: https://github.com/rust-lang/rust/pull/78439
778 [78343]: https://github.com/rust-lang/rust/pull/78343
779 [78296]: https://github.com/rust-lang/rust/pull/78296
780 [78068]: https://github.com/rust-lang/rust/pull/78068
781 [75752]: https://github.com/rust-lang/rust/pull/75752
782 [74699]: https://github.com/rust-lang/rust/pull/74699
783 [78142]: https://github.com/rust-lang/rust/pull/78142
784 [77484]: https://github.com/rust-lang/rust/pull/77484
785 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
786 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
787 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
788 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
789 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
790 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
791 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
792 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
793 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
794 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
795 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
796 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
797 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
798 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
799 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
800 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
801 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
802 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
803 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
804 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
805 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
806 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
807 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
808 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
809 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
810 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
811 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
812 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
813 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
814 [`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
815 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
816 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
817 [`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
818 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
821 Version 1.49.0 (2020-12-31)
822 ============================
825 -----------------------
827 - [Unions can now implement `Drop`, and you can now have a field in a union
828 with `ManuallyDrop<T>`.][77547]
829 - [You can now cast uninhabited enums to integers.][76199]
830 - [You can now bind by reference and by move in patterns.][76119] This
831 allows you to selectively borrow individual components of a type. E.g.
839 let person = Person {
840 name: String::from("Alice"),
844 // `name` is moved out of person, but `age` is referenced.
845 let Person { name, ref age } = person;
846 println!("{} {}", name, age);
850 -----------------------
852 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
853 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
854 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
855 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
856 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
857 - [Output from threads spawned in tests is now captured.][78227]
858 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
860 \* Refer to Rust's [platform support page][platform-support-doc] for more
861 information on Rust's tiered platform support.
864 -----------------------
866 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
867 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
872 - [`slice::select_nth_unstable`]
873 - [`slice::select_nth_unstable_by`]
874 - [`slice::select_nth_unstable_by_key`]
876 The following previously stable methods are now `const`.
879 - [`Poll::is_pending`]
882 -----------------------
883 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
884 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
885 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
886 variable will be set if the crate being built is one the user selected to build, either
887 with `-p` or through defaults.
888 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
894 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
895 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
896 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
897 Previously such invalid or unused attributes could be ignored.
898 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
899 read [this post about the changes][rustdoc-ws-post] for more details.
900 - [Trait bounds are no longer inferred for associated types.][79904]
904 These changes provide no direct user facing benefits, but represent significant
905 improvements to the internals and overall performance of rustc and
908 - [rustc's internal crates are now compiled using the `initial-exec` Thread
909 Local Storage model.][78201]
910 - [Calculate visibilities once in resolve.][78077]
911 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
912 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
915 [75991]: https://github.com/rust-lang/rust/pull/75991
916 [78951]: https://github.com/rust-lang/rust/pull/78951
917 [78848]: https://github.com/rust-lang/rust/pull/78848
918 [78746]: https://github.com/rust-lang/rust/pull/78746
919 [78376]: https://github.com/rust-lang/rust/pull/78376
920 [78228]: https://github.com/rust-lang/rust/pull/78228
921 [78227]: https://github.com/rust-lang/rust/pull/78227
922 [78201]: https://github.com/rust-lang/rust/pull/78201
923 [78109]: https://github.com/rust-lang/rust/pull/78109
924 [78077]: https://github.com/rust-lang/rust/pull/78077
925 [77997]: https://github.com/rust-lang/rust/pull/77997
926 [77703]: https://github.com/rust-lang/rust/pull/77703
927 [77547]: https://github.com/rust-lang/rust/pull/77547
928 [77015]: https://github.com/rust-lang/rust/pull/77015
929 [76199]: https://github.com/rust-lang/rust/pull/76199
930 [76119]: https://github.com/rust-lang/rust/pull/76119
931 [75914]: https://github.com/rust-lang/rust/pull/75914
932 [79004]: https://github.com/rust-lang/rust/pull/79004
933 [78676]: https://github.com/rust-lang/rust/pull/78676
934 [79904]: https://github.com/rust-lang/rust/issues/79904
935 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
936 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
937 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
938 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
939 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
940 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
941 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
942 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
943 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
944 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
945 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
947 Version 1.48.0 (2020-11-19)
948 ==========================
953 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
954 is still rejected *semantically*, but can now be parsed by procedural macros.
958 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
959 `rustc` whether to link its own C runtime and libraries or to rely on a external
960 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
961 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
962 Note: If you're using cargo you must explicitly pass the `--target` flag.
963 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
965 \* Refer to Rust's [platform support page][platform-support-doc] for more
966 information on Rust's tiered platform support.
970 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
971 and `&Stderr`.][76275]
972 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
973 - [The `matches!` macro now supports having a trailing comma.][74880]
974 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
975 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
979 - [`slice::as_ptr_range`]
980 - [`slice::as_mut_ptr_range`]
981 - [`VecDeque::make_contiguous`]
982 - [`future::pending`]
985 The following previously stable methods are now `const fn`'s:
987 - [`Option::is_some`]
988 - [`Option::is_none`]
993 - [`Ordering::reverse`]
1001 - [You can now link to items in `rustdoc` using the intra-doc link
1002 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1003 a link to `std::future`'s documentation. See ["Linking to items by
1004 name"][intradoc-links] for more information.
1005 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1006 when searching through `rustdoc`'s UI.][75740]
1010 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1011 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1012 promoted to `'static` lifetime any more inside `const fn`s.
1013 - [Associated type bindings on trait objects are now verified to meet the bounds
1014 declared on the trait when checking that they implement the trait.][27675]
1015 - [When trait bounds on associated types or opaque types are ambiguous, the
1016 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1017 - [Fixed recursive nonterminals not being expanded in macros during
1018 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1019 correctly handling recursive nonterminal tokens.
1020 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1021 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1022 in places where they have no effect.][73461]
1023 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1024 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1025 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1026 disallow zero-initialization.][71274]
1027 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1028 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1029 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1030 see the [`catch_unwind`] documentation for further information.
1036 These changes provide no direct user facing benefits, but represent significant
1037 improvements to the internals and overall performance of rustc and
1040 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1041 You can continue building with `make` by setting `ninja=false` in
1043 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1044 - [Made `ensure_sufficient_stack()` non-generic][76680]
1046 [78143]: https://github.com/rust-lang/rust/issues/78143
1047 [76680]: https://github.com/rust-lang/rust/pull/76680/
1048 [76030]: https://github.com/rust-lang/rust/pull/76030/
1049 [70212]: https://github.com/rust-lang/rust/pull/70212/
1050 [27675]: https://github.com/rust-lang/rust/issues/27675/
1051 [54121]: https://github.com/rust-lang/rust/issues/54121/
1052 [71274]: https://github.com/rust-lang/rust/pull/71274/
1053 [77386]: https://github.com/rust-lang/rust/pull/77386/
1054 [77153]: https://github.com/rust-lang/rust/pull/77153/
1055 [77055]: https://github.com/rust-lang/rust/pull/77055/
1056 [76275]: https://github.com/rust-lang/rust/pull/76275/
1057 [76310]: https://github.com/rust-lang/rust/pull/76310/
1058 [76420]: https://github.com/rust-lang/rust/pull/76420/
1059 [76158]: https://github.com/rust-lang/rust/pull/76158/
1060 [75857]: https://github.com/rust-lang/rust/pull/75857/
1061 [75585]: https://github.com/rust-lang/rust/pull/75585/
1062 [75740]: https://github.com/rust-lang/rust/pull/75740/
1063 [75502]: https://github.com/rust-lang/rust/pull/75502/
1064 [74880]: https://github.com/rust-lang/rust/pull/74880/
1065 [74922]: https://github.com/rust-lang/rust/pull/74922/
1066 [74430]: https://github.com/rust-lang/rust/pull/74430/
1067 [74194]: https://github.com/rust-lang/rust/pull/74194/
1068 [73461]: https://github.com/rust-lang/rust/pull/73461/
1069 [73166]: https://github.com/rust-lang/rust/pull/73166/
1070 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1071 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1072 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1073 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1074 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1075 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1076 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1077 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1078 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1079 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1080 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1081 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1082 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1083 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1084 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1087 Version 1.47.0 (2020-10-08)
1088 ==========================
1092 - [Closures will now warn when not used.][74869]
1096 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1097 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1099 - [Upgraded to LLVM 11.][73526]
1100 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1101 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1102 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1104 \* Refer to Rust's [platform support page][platform-support-doc] for more
1105 information on Rust's tiered platform support.
1109 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1110 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1111 those of length less than 33.][74060]
1112 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1113 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1114 `PartialEq`, and `PartialOrd`.][73583]
1118 - [`Ident::new_raw`]
1119 - [`Range::is_empty`]
1120 - [`RangeInclusive::is_empty`]
1121 - [`Result::as_deref`]
1122 - [`Result::as_deref_mut`]
1124 - [`pointer::offset_from`]
1128 The following previously stable APIs have now been made const.
1130 - [The `new` method for all `NonZero` integers.][73858]
1131 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1132 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1133 methods for all integers.][73858]
1134 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1135 signed integers.][73858]
1136 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1137 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1138 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1139 `is_ascii_control` methods for `char` and `u8`.][73858]
1143 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1144 You can override this by setting the following in your `Cargo.toml`.
1146 [profile.release.build-override]
1149 - [`cargo-help` will now display man pages for commands rather just the
1150 `--help` text.][cargo/8456]
1151 - [`cargo-metadata` now emits a `test` field indicating if a target has
1152 tests enabled.][cargo/8478]
1153 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1154 - [`cargo-publish` will now use an alternative registry by default if it's the
1155 only registry specified in `package.publish`.][cargo/8571]
1159 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1160 type based search.][75366]
1161 - [Added the Ayu theme to rustdoc.][71237]
1165 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1166 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1167 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1168 help to preserve more span information.][73084] These changes may cause
1169 compiliation errors if your macro was unhygenic or didn't correctly handle
1171 - [Moved support for the CloudABI target to tier 3.][75568]
1172 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1173 - [Added the `rustc-docs` component.][75560] This allows you to install
1174 and read the documentation for the compiler internal APIs. (Currently only
1175 available for `x86_64-unknown-linux-gnu`.)
1180 - [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.
1182 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1183 [75048]: https://github.com/rust-lang/rust/pull/75048/
1184 [74163]: https://github.com/rust-lang/rust/pull/74163/
1185 [71237]: https://github.com/rust-lang/rust/pull/71237/
1186 [74869]: https://github.com/rust-lang/rust/pull/74869/
1187 [73858]: https://github.com/rust-lang/rust/pull/73858/
1188 [75716]: https://github.com/rust-lang/rust/pull/75716/
1189 [75908]: https://github.com/rust-lang/rust/pull/75908/
1190 [75516]: https://github.com/rust-lang/rust/pull/75516/
1191 [75560]: https://github.com/rust-lang/rust/pull/75560/
1192 [75568]: https://github.com/rust-lang/rust/pull/75568/
1193 [75366]: https://github.com/rust-lang/rust/pull/75366/
1194 [75204]: https://github.com/rust-lang/rust/pull/75204/
1195 [74650]: https://github.com/rust-lang/rust/pull/74650/
1196 [74419]: https://github.com/rust-lang/rust/pull/74419/
1197 [73964]: https://github.com/rust-lang/rust/pull/73964/
1198 [74021]: https://github.com/rust-lang/rust/pull/74021/
1199 [74060]: https://github.com/rust-lang/rust/pull/74060/
1200 [73893]: https://github.com/rust-lang/rust/pull/73893/
1201 [73526]: https://github.com/rust-lang/rust/pull/73526/
1202 [73583]: https://github.com/rust-lang/rust/pull/73583/
1203 [73084]: https://github.com/rust-lang/rust/pull/73084/
1204 [73197]: https://github.com/rust-lang/rust/pull/73197/
1205 [72488]: https://github.com/rust-lang/rust/pull/72488/
1206 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1207 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1208 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1209 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1210 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1211 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1212 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1213 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1214 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1215 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1216 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1217 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1218 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1219 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1220 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1223 Version 1.46.0 (2020-08-27)
1224 ==========================
1228 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1229 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1230 const functions.][73862]
1231 - [The `#[track_caller]` attribute can now be added to functions to use the
1232 function's caller's location information for panic messages.][72445]
1233 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1234 `x.0.0` over `(x.0).0`.
1235 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1236 You currently can't use `mem::transmute` in constant functions.
1240 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1241 - [Enabled static "Position Independent Executables" by default
1242 for `x86_64-unknown-linux-musl`.][70740]
1246 - [`mem::forget` is now a `const fn`.][73887]
1247 - [`String` now implements `From<char>`.][73466]
1248 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1249 integer types.][73032]
1250 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1251 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1252 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1253 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1254 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1255 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1260 - [`vec::Drain::as_slice`]
1264 Added a number of new environment variables that are now available when
1265 compiling your crate.
1267 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1268 the specific binary being compiled and the name of the crate.
1269 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1270 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1274 - [The target configuration option `abi_blacklist` has been renamed
1275 to `unsupported_abis`.][74150] The old name will still continue to work.
1276 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1277 This was previously accepted but will become a hard error in a future release.
1278 - [Rustc will fail to compile if you have a struct with
1279 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1281 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1282 ensure that spans have the correct information, and may cause breakage if you
1283 were relying on receiving spans with dummy information.
1284 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1285 a legacy installer that was replaced by a MSI installer a few years ago but
1286 was still being built.
1287 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1288 - [Rustc will no longer accept overlapping trait implementations that only
1289 differ in how the lifetime was bound.][72493]
1290 - [Rustc now correctly relates the lifetime of an existential associated
1291 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1292 you to pass a shorter lifetime than expected.
1293 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1294 The library will need to be installed for `rustc` to work, even though we
1295 expect it to be already available on most systems.
1296 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1298 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1299 exact output returned by rustc's pretty printing is an unstable
1300 implementation detail: we recommend any macro relying on it to switch to a
1301 more robust parsing system.
1303 [75453]: https://github.com/rust-lang/rust/issues/75453/
1304 [74820]: https://github.com/rust-lang/rust/issues/74820/
1305 [74420]: https://github.com/rust-lang/rust/issues/74420/
1306 [74109]: https://github.com/rust-lang/rust/pull/74109/
1307 [74150]: https://github.com/rust-lang/rust/pull/74150/
1308 [73862]: https://github.com/rust-lang/rust/pull/73862/
1309 [73887]: https://github.com/rust-lang/rust/pull/73887/
1310 [73466]: https://github.com/rust-lang/rust/pull/73466/
1311 [73516]: https://github.com/rust-lang/rust/pull/73516/
1312 [73293]: https://github.com/rust-lang/rust/pull/73293/
1313 [73007]: https://github.com/rust-lang/rust/pull/73007/
1314 [73032]: https://github.com/rust-lang/rust/pull/73032/
1315 [72920]: https://github.com/rust-lang/rust/pull/72920/
1316 [72569]: https://github.com/rust-lang/rust/pull/72569/
1317 [72583]: https://github.com/rust-lang/rust/pull/72583/
1318 [72584]: https://github.com/rust-lang/rust/pull/72584/
1319 [72717]: https://github.com/rust-lang/rust/pull/72717/
1320 [72437]: https://github.com/rust-lang/rust/pull/72437/
1321 [72445]: https://github.com/rust-lang/rust/pull/72445/
1322 [72486]: https://github.com/rust-lang/rust/pull/72486/
1323 [72493]: https://github.com/rust-lang/rust/pull/72493/
1324 [72331]: https://github.com/rust-lang/rust/pull/72331/
1325 [71896]: https://github.com/rust-lang/rust/pull/71896/
1326 [71660]: https://github.com/rust-lang/rust/pull/71660/
1327 [71322]: https://github.com/rust-lang/rust/pull/71322/
1328 [70740]: https://github.com/rust-lang/rust/pull/70740/
1329 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1330 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1331 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1332 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1333 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1336 Version 1.45.2 (2020-08-03)
1337 ==========================
1339 * [Fix bindings in tuple struct patterns][74954]
1340 * [Fix track_caller integration with trait objects][74784]
1342 [74954]: https://github.com/rust-lang/rust/issues/74954
1343 [74784]: https://github.com/rust-lang/rust/issues/74784
1346 Version 1.45.1 (2020-07-30)
1347 ==========================
1349 * [Fix const propagation with references.][73613]
1350 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1351 * [Avoid spurious implicit region bound.][74509]
1352 * [Install clippy on x.py install][74457]
1354 [73613]: https://github.com/rust-lang/rust/pull/73613
1355 [73078]: https://github.com/rust-lang/rust/issues/73078
1356 [74509]: https://github.com/rust-lang/rust/pull/74509
1357 [74457]: https://github.com/rust-lang/rust/pull/74457
1360 Version 1.45.0 (2020-07-16)
1361 ==========================
1365 - [Out of range float to int conversions using `as` has been defined as a saturating
1366 conversion.][71269] This was previously undefined behaviour, but you can use the
1367 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1368 may be desirable in rare performance sensitive situations.
1369 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1370 using `u64`.][70705]
1371 - [Function like procedural macros can now be used in expression, pattern, and statement
1372 positions.][68717] This means you can now use a function-like procedural macro
1373 anywhere you can use a declarative (`macro_rules!`) macro.
1377 - [You can now override individual target features through the `target-feature`
1378 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1379 equivalent to `-C target-feature=+avx2,+fma`.
1380 - [Added the `force-unwind-tables` flag.][69984] This option allows
1381 rustc to always generate unwind tables regardless of panic strategy.
1382 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1383 to include LLVM bitcode into generated `rlib`s (this is on by default).
1384 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1385 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1386 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1387 - [Upgraded to LLVM 10.][67759]
1389 \* Refer to Rust's [platform support page][platform-support-doc] for more
1390 information on Rust's tiered platform support.
1395 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1397 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1398 - [You can now use `char` with
1399 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1400 a range of codepoints.][72413] E.g.
1401 you can now write the following;
1403 for ch in 'a'..='z' {
1407 // Prints "abcdefghijklmnopqrstuvwxyz"
1409 - [`OsString` now implements `FromStr`.][71662]
1410 - [The `saturating_neg` method has been added to all signed integer primitive
1411 types, and the `saturating_abs` method has been added for all integer
1412 primitive types.][71886]
1413 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1414 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1416 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1417 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1418 integer types.][69813]
1419 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1420 integer types.][72324]
1421 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1426 - [`BTreeMap::remove_entry`]
1428 - [`rc::Weak::as_ptr`]
1429 - [`rc::Weak::from_raw`]
1430 - [`rc::Weak::into_raw`]
1431 - [`str::strip_prefix`]
1432 - [`str::strip_suffix`]
1433 - [`sync::Weak::as_ptr`]
1434 - [`sync::Weak::from_raw`]
1435 - [`sync::Weak::into_raw`]
1436 - [`char::UNICODE_VERSION`]
1437 - [`Span::resolved_at`]
1438 - [`Span::located_at`]
1439 - [`Span::mixed_site`]
1440 - [`unix::process::CommandExt::arg0`]
1445 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1450 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1451 `~~outdated information~~` becomes "~~outdated information~~".
1452 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1456 - [Trying to self initialize a static value (that is creating a value using
1457 itself) is unsound and now causes a compile error.][71140]
1458 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1459 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1460 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1461 previously undocumented and not intended for public use. Rustdoc still provides
1462 a non-zero exit code on errors.
1463 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1464 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1465 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1466 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1467 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1471 - [Make clippy a git subtree instead of a git submodule][70655]
1472 - [Unify the undo log of all snapshot types][69464]
1474 [71848]: https://github.com/rust-lang/rust/issues/71848/
1475 [73420]: https://github.com/rust-lang/rust/issues/73420/
1476 [72324]: https://github.com/rust-lang/rust/pull/72324/
1477 [71843]: https://github.com/rust-lang/rust/pull/71843/
1478 [71886]: https://github.com/rust-lang/rust/pull/71886/
1479 [72234]: https://github.com/rust-lang/rust/pull/72234/
1480 [72239]: https://github.com/rust-lang/rust/pull/72239/
1481 [72397]: https://github.com/rust-lang/rust/pull/72397/
1482 [72413]: https://github.com/rust-lang/rust/pull/72413/
1483 [72014]: https://github.com/rust-lang/rust/pull/72014/
1484 [72062]: https://github.com/rust-lang/rust/pull/72062/
1485 [72094]: https://github.com/rust-lang/rust/pull/72094/
1486 [72133]: https://github.com/rust-lang/rust/pull/72133/
1487 [67759]: https://github.com/rust-lang/rust/pull/67759/
1488 [71900]: https://github.com/rust-lang/rust/pull/71900/
1489 [71928]: https://github.com/rust-lang/rust/pull/71928/
1490 [71662]: https://github.com/rust-lang/rust/pull/71662/
1491 [71716]: https://github.com/rust-lang/rust/pull/71716/
1492 [71447]: https://github.com/rust-lang/rust/pull/71447/
1493 [71269]: https://github.com/rust-lang/rust/pull/71269/
1494 [71095]: https://github.com/rust-lang/rust/pull/71095/
1495 [71140]: https://github.com/rust-lang/rust/pull/71140/
1496 [70655]: https://github.com/rust-lang/rust/pull/70655/
1497 [70705]: https://github.com/rust-lang/rust/pull/70705/
1498 [69984]: https://github.com/rust-lang/rust/pull/69984/
1499 [69813]: https://github.com/rust-lang/rust/pull/69813/
1500 [69464]: https://github.com/rust-lang/rust/pull/69464/
1501 [68717]: https://github.com/rust-lang/rust/pull/68717/
1502 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1503 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1504 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1505 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1506 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1507 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1508 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1509 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1510 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1511 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1512 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1513 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1514 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1515 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1516 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1517 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1518 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1521 Version 1.44.1 (2020-06-18)
1522 ===========================
1524 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1525 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1526 * [Fix crashes when finding backtrace on macOS.][71397]
1527 * [Clippy applies lint levels into different files.][clippy/5356]
1529 [71397]: https://github.com/rust-lang/rust/issues/71397
1530 [73078]: https://github.com/rust-lang/rust/issues/73078
1531 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1532 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1535 Version 1.44.0 (2020-06-04)
1536 ==========================
1540 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1541 - [Added the `unused_braces` lint.][70081]
1543 **Syntax-only changes**
1545 - [Expansion-driven outline module parsing][69838]
1550 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1555 These are still rejected semantically, so you will likely receive an error but
1556 these changes can be seen and parsed by macros and conditional compilation.
1560 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1561 Additionally when in incremental mode rustc defaults to 256 codegen units.
1562 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1563 a panic is thrown.][67502]
1564 - [Added tier 3\* support for the `aarch64-unknown-none` and
1565 `aarch64-unknown-none-softfloat` targets.][68334]
1566 - [Added tier 3 support for `arm64-apple-tvos` and
1567 `x86_64-apple-tvos` targets.][68191]
1572 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1573 `vec![]` to be able to be used in `const` contexts.
1574 - [`convert::Infallible` now implements `Hash`.][70281]
1575 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1576 a `&mut OsStr`.][70048]
1577 - [Unicode 13 is now supported.][69929]
1578 - [`String` now implements `From<&mut str>`.][69661]
1579 - [`IoSlice` now implements `Copy`.][69403]
1580 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1581 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1582 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1583 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1584 integer types.][69373]
1588 - [`PathBuf::with_capacity`]
1589 - [`PathBuf::capacity`]
1590 - [`PathBuf::clear`]
1591 - [`PathBuf::reserve`]
1592 - [`PathBuf::reserve_exact`]
1593 - [`PathBuf::shrink_to_fit`]
1594 - [`f32::to_int_unchecked`]
1595 - [`f64::to_int_unchecked`]
1596 - [`Layout::align_to`]
1597 - [`Layout::pad_to_align`]
1599 - [`Layout::extend`]
1603 - [Added the `cargo tree` command which will print a tree graph of
1604 your dependencies.][cargo/8062] E.g.
1606 mdbook v0.3.2 (/Users/src/rust/mdbook)
1608 │ ├── html5ever v0.24.0
1610 │ │ │ └── cfg-if v0.1.9
1612 │ │ └── markup5ever v0.9.0
1613 │ │ ├── log v0.4.8 (*)
1615 │ │ │ └── phf_shared v0.7.24
1616 │ │ │ ├── siphasher v0.2.3
1617 │ │ │ └── unicase v1.4.2
1618 │ │ │ [build-dependencies]
1619 │ │ │ └── version_check v0.1.5
1622 You can also display dependencies on multiple versions of the same crate with
1623 `cargo tree -d` (short for `cargo tree --duplicates`).
1627 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1628 the version in the sidebar.][69494]
1632 - [Rustc now correctly generates static libraries on Windows GNU targets with
1633 the `.a` extension, rather than the previous `.lib`.][70937]
1634 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1635 - [The `file_name` property in JSON output of macro errors now points the actual
1636 source file rather than the previous format of `<NAME macros>`.][70969]
1637 **Note:** this may not point to a file that actually exists on the user's system.
1638 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1639 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1640 not allow zero initialization such as `NonZeroU8`.][66059] This was
1641 previously a warning.
1642 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1643 operator has been defined as a saturating operation.][71269] This was previously
1644 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1645 continue using the current behaviour, which may be desirable in rare performance
1646 sensitive situations.
1650 These changes provide no direct user facing benefits, but represent significant
1651 improvements to the internals and overall performance of rustc and
1654 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1655 - [Replace big JS dict with JSON parsing.][71250]
1657 [69373]: https://github.com/rust-lang/rust/pull/69373/
1658 [66059]: https://github.com/rust-lang/rust/pull/66059/
1659 [68191]: https://github.com/rust-lang/rust/pull/68191/
1660 [68899]: https://github.com/rust-lang/rust/pull/68899/
1661 [71147]: https://github.com/rust-lang/rust/pull/71147/
1662 [71250]: https://github.com/rust-lang/rust/pull/71250/
1663 [70937]: https://github.com/rust-lang/rust/pull/70937/
1664 [70969]: https://github.com/rust-lang/rust/pull/70969/
1665 [70632]: https://github.com/rust-lang/rust/pull/70632/
1666 [70281]: https://github.com/rust-lang/rust/pull/70281/
1667 [70345]: https://github.com/rust-lang/rust/pull/70345/
1668 [70048]: https://github.com/rust-lang/rust/pull/70048/
1669 [70081]: https://github.com/rust-lang/rust/pull/70081/
1670 [70156]: https://github.com/rust-lang/rust/pull/70156/
1671 [71269]: https://github.com/rust-lang/rust/pull/71269/
1672 [69838]: https://github.com/rust-lang/rust/pull/69838/
1673 [69929]: https://github.com/rust-lang/rust/pull/69929/
1674 [69661]: https://github.com/rust-lang/rust/pull/69661/
1675 [69778]: https://github.com/rust-lang/rust/pull/69778/
1676 [69494]: https://github.com/rust-lang/rust/pull/69494/
1677 [69403]: https://github.com/rust-lang/rust/pull/69403/
1678 [69033]: https://github.com/rust-lang/rust/pull/69033/
1679 [68692]: https://github.com/rust-lang/rust/pull/68692/
1680 [68334]: https://github.com/rust-lang/rust/pull/68334/
1681 [67502]: https://github.com/rust-lang/rust/pull/67502/
1682 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1683 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1684 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1685 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1686 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1687 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1688 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1689 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1690 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1691 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1692 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1693 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1694 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1697 Version 1.43.1 (2020-05-07)
1698 ===========================
1700 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1701 * [Fixed the stabilization of AVX-512 features.][71473]
1702 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1704 [71430]: https://github.com/rust-lang/rust/pull/71430
1705 [71473]: https://github.com/rust-lang/rust/issues/71473
1706 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1709 Version 1.43.0 (2020-04-23)
1710 ==========================
1714 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1715 the type inferred correctly.][68129]
1716 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1718 **Syntax only changes**
1719 - [Allow `type Foo: Ord` syntactically.][69361]
1720 - [Fuse associated and extern items up to defaultness.][69194]
1721 - [Syntactically allow `self` in all `fn` contexts.][68764]
1722 - [Merge `fn` syntax + cleanup item parsing.][68728]
1723 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1724 For example, you may now write:
1726 macro_rules! mac_trait {
1736 These are still rejected *semantically*, so you will likely receive an error but
1737 these changes can be seen and parsed by macros and
1738 conditional compilation.
1743 - [You can now pass multiple lint flags to rustc to override the previous
1744 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1745 everything in the `unused` lint group except `unused-variables` which
1746 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1747 everything in the `unused` lint group **including** `unused-variables` since
1748 the allow flag is specified before the deny flag (and therefore overridden).
1749 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1750 if they are available on `windows-gnu`.][67429]
1751 - [rustc now buffers errors/warnings printed in JSON.][69227]
1755 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1756 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1757 respectively.][69538] **Note** These conversions are only available when `N`
1759 - [You can now use associated constants on floats and integers directly, rather
1760 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1761 `f32::NAN` with no imports.
1762 - [`u8::is_ascii` is now `const`.][68984]
1763 - [`String` now implements `AsMut<str>`.][68742]
1764 - [Added the `primitive` module to `std` and `core`.][67637] This module
1765 reexports Rust's primitive types. This is mainly useful in macros
1766 where you want avoid these types being shadowed.
1767 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1768 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1772 - [`Once::is_completed`]
1777 - [`iter::once_with`]
1781 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1782 your environment.][cargo/7823]
1783 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1784 executable path when running integration tests or benchmarks.][cargo/7697]
1785 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1786 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1790 - [Certain checks in the `const_err` lint were deemed unrelated to const
1791 evaluation][69185], and have been moved to the `unconditional_panic` and
1792 `arithmetic_overflow` lints.
1797 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1798 has been a warning since 1.36.0.
1799 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1800 led to some instances being accepted, and now correctly emits a hard error.
1802 [69340]: https://github.com/rust-lang/rust/pull/69340
1806 These changes provide no direct user facing benefits, but represent significant
1807 improvements to the internals and overall performance of `rustc` and
1810 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1811 - [Improved how rustc generates drop code.][67332]
1812 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1813 - [traits: preallocate 2 Vecs of known initial size][69022]
1814 - [Avoid exponential behaviour when relating types][68772]
1815 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1816 - [Improve performance of coherence checks][68966]
1817 - [Deduplicate types in the generator witness][68672]
1818 - [Invert control in struct_lint_level.][68725]
1820 [67332]: https://github.com/rust-lang/rust/pull/67332/
1821 [67429]: https://github.com/rust-lang/rust/pull/67429/
1822 [67637]: https://github.com/rust-lang/rust/pull/67637/
1823 [67642]: https://github.com/rust-lang/rust/pull/67642/
1824 [67878]: https://github.com/rust-lang/rust/pull/67878/
1825 [67885]: https://github.com/rust-lang/rust/pull/67885/
1826 [68129]: https://github.com/rust-lang/rust/pull/68129/
1827 [68672]: https://github.com/rust-lang/rust/pull/68672/
1828 [68725]: https://github.com/rust-lang/rust/pull/68725/
1829 [68728]: https://github.com/rust-lang/rust/pull/68728/
1830 [68738]: https://github.com/rust-lang/rust/pull/68738/
1831 [68742]: https://github.com/rust-lang/rust/pull/68742/
1832 [68764]: https://github.com/rust-lang/rust/pull/68764/
1833 [68772]: https://github.com/rust-lang/rust/pull/68772/
1834 [68943]: https://github.com/rust-lang/rust/pull/68943/
1835 [68952]: https://github.com/rust-lang/rust/pull/68952/
1836 [68966]: https://github.com/rust-lang/rust/pull/68966/
1837 [68984]: https://github.com/rust-lang/rust/pull/68984/
1838 [69022]: https://github.com/rust-lang/rust/pull/69022/
1839 [69185]: https://github.com/rust-lang/rust/pull/69185/
1840 [69194]: https://github.com/rust-lang/rust/pull/69194/
1841 [69201]: https://github.com/rust-lang/rust/pull/69201/
1842 [69227]: https://github.com/rust-lang/rust/pull/69227/
1843 [69548]: https://github.com/rust-lang/rust/pull/69548/
1844 [69256]: https://github.com/rust-lang/rust/pull/69256/
1845 [69361]: https://github.com/rust-lang/rust/pull/69361/
1846 [69366]: https://github.com/rust-lang/rust/pull/69366/
1847 [69538]: https://github.com/rust-lang/rust/pull/69538/
1848 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1849 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1850 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1851 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1852 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1853 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1854 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1855 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1858 Version 1.42.0 (2020-03-12)
1859 ==========================
1863 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1865 fn foo(words: &[&str]) {
1867 ["Hello", "World", "!", ..] => println!("Hello World!"),
1868 ["Foo", "Bar", ..] => println!("Baz"),
1869 rest => println!("{:?}", rest),
1873 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1874 that you can create an enum that has the exact layout and ABI of the type
1876 - [You can now use outer attribute procedural macros on inline modules.][64273]
1877 - [There are some *syntax-only* changes:][67131]
1878 - `default` is syntactically allowed before items in `trait` definitions.
1879 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1880 leave out their bodies in favor of `;`.
1881 - Bounds on associated types in `impl`s are now syntactically allowed
1882 (e.g. `type Foo: Ord;`).
1883 - `...` (the C-variadic type) may occur syntactically directly as the type of
1884 any function parameter.
1886 These are still rejected *semantically*, so you will likely receive an error
1887 but these changes can be seen and parsed by procedural macros and
1888 conditional compilation.
1892 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1893 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1894 - [`Option::{expect,unwrap}` and
1895 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1896 pointing to the location where they were called, rather than
1897 `core`'s internals. ][67887]
1899 \* Refer to Rust's [platform support page][platform-support-doc] for more
1900 information on Rust's tiered platform support.
1904 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1905 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1906 to implement `Sized`.][67935]
1907 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1908 - [`Layout::new` is now `const`.][66254]
1909 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1914 - [`CondVar::wait_while`]
1915 - [`CondVar::wait_timeout_while`]
1917 - [`DebugMap::value`]
1918 - [`ManuallyDrop::take`]
1920 - [`ptr::slice_from_raw_parts_mut`]
1921 - [`ptr::slice_from_raw_parts`]
1925 - [You no longer need to include `extern crate proc_macro;` to be able to
1926 `use proc_macro;` in the `2018` edition.][cargo/7700]
1930 - [`Error::description` has been deprecated, and its use will now produce a
1931 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1933 [68253]: https://github.com/rust-lang/rust/pull/68253/
1934 [68348]: https://github.com/rust-lang/rust/pull/68348/
1935 [67935]: https://github.com/rust-lang/rust/pull/67935/
1936 [68339]: https://github.com/rust-lang/rust/pull/68339/
1937 [68122]: https://github.com/rust-lang/rust/pull/68122/
1938 [64273]: https://github.com/rust-lang/rust/pull/64273/
1939 [67712]: https://github.com/rust-lang/rust/pull/67712/
1940 [67887]: https://github.com/rust-lang/rust/pull/67887/
1941 [67131]: https://github.com/rust-lang/rust/pull/67131/
1942 [67233]: https://github.com/rust-lang/rust/pull/67233/
1943 [66899]: https://github.com/rust-lang/rust/pull/66899/
1944 [66919]: https://github.com/rust-lang/rust/pull/66919/
1945 [66254]: https://github.com/rust-lang/rust/pull/66254/
1946 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1947 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1948 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1949 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1950 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1951 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1952 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1953 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1954 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1957 Version 1.41.1 (2020-02-27)
1958 ===========================
1960 * [Always check types of static items][69145]
1961 * [Always check lifetime bounds of `Copy` impls][69145]
1962 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1964 [69225]: https://github.com/rust-lang/rust/issues/69225
1965 [69145]: https://github.com/rust-lang/rust/pull/69145
1968 Version 1.41.0 (2020-01-30)
1969 ===========================
1974 - [You can now pass type parameters to foreign items when implementing
1975 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1976 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1977 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1978 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1979 - [You can now use any valid identifier in a `format_args` macro.][66847]
1980 Previously identifiers starting with an underscore were not allowed.
1981 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1982 enum variants.][66183] These are still rejected semantically, but
1983 can be seen and parsed by procedural macros and conditional compilation.
1988 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1989 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1990 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1991 - [You can now pass an arguments file passing the `@path` syntax
1992 to rustc.][66172] Note that the format differs somewhat from what is
1993 found in other tooling; please see [the documentation][argfile-docs] for
1995 - [You can now provide `--extern` flag without a path, indicating that it is
1996 available from the search path or specified with an `-L` flag.][64882]
1998 \* Refer to Rust's [platform support page][platform-support-doc] for more
1999 information on Rust's tiered platform support.
2001 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2006 - [The `core::panic` module is now stable.][66771] It was already stable
2008 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2009 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2010 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2015 - [`Result::map_or`]
2016 - [`Result::map_or_else`]
2017 - [`std::rc::Weak::weak_count`]
2018 - [`std::rc::Weak::strong_count`]
2019 - [`std::sync::Weak::weak_count`]
2020 - [`std::sync::Weak::strong_count`]
2025 - [Cargo will now document all the private items for binary crates
2026 by default.][cargo/7593]
2027 - [`cargo-install` will now reinstall the package if it detects that it is out
2028 of date.][cargo/7560]
2029 - [Cargo.lock now uses a more git friendly format that should help to reduce
2030 merge conflicts.][cargo/7579]
2031 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2032 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2033 optimisation level to `2` for debug builds. You can also use
2034 `[profile.<profile>.build-override]` to override build scripts and
2040 - [You can now specify `edition` in documentation code blocks to compile the block
2041 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2042 should be compiled the 2018 edition of Rust.
2043 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2044 current theme with `--check-theme`.][54733]
2045 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2050 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2051 Apple targets.][apple-32bit-drop] This means that the source code is still
2052 available to build, but the targets are no longer being tested and release
2053 binaries for those platforms will no longer be distributed by the Rust project.
2054 Please refer to the linked blog post for more information.
2056 [54733]: https://github.com/rust-lang/rust/pull/54733/
2057 [61351]: https://github.com/rust-lang/rust/pull/61351/
2058 [67255]: https://github.com/rust-lang/rust/pull/67255/
2059 [66661]: https://github.com/rust-lang/rust/pull/66661/
2060 [66771]: https://github.com/rust-lang/rust/pull/66771/
2061 [66847]: https://github.com/rust-lang/rust/pull/66847/
2062 [66238]: https://github.com/rust-lang/rust/pull/66238/
2063 [66277]: https://github.com/rust-lang/rust/pull/66277/
2064 [66325]: https://github.com/rust-lang/rust/pull/66325/
2065 [66172]: https://github.com/rust-lang/rust/pull/66172/
2066 [66183]: https://github.com/rust-lang/rust/pull/66183/
2067 [65879]: https://github.com/rust-lang/rust/pull/65879/
2068 [65013]: https://github.com/rust-lang/rust/pull/65013/
2069 [64882]: https://github.com/rust-lang/rust/pull/64882/
2070 [64325]: https://github.com/rust-lang/rust/pull/64325/
2071 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2072 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2073 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2074 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2075 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2076 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2077 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2078 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2079 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2080 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2081 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2083 Version 1.40.0 (2019-12-19)
2084 ===========================
2088 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2089 `const` contexts.][65188] e.g.
2092 pub struct Point(i32, i32);
2094 const ORIGIN: Point = {
2095 let constructor = Point;
2101 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2102 indicate that there may be variants or fields added in the future.][64639]
2103 For example this requires adding a wild-card branch (`_ => {}`) to any match
2104 statements on a non-exhaustive `enum`. [(RFC 2008)]
2105 - [You can now use function-like procedural macros in `extern` blocks and in
2106 type positions.][63931] e.g. `type Generated = macro!();`
2107 - [Function-like and attribute procedural macros can now emit
2108 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2109 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2110 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2111 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2115 - [Added tier 3 support\* for the
2116 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2117 - [Added tier 3 support for the
2118 `aarch64-unknown-none-softfloat` target.][64589]
2119 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2120 `mips64el-unknown-linux-muslabi64` targets.][65843]
2122 \* Refer to Rust's [platform support page][platform-support-doc] for more
2123 information on Rust's tiered platform support.
2127 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2131 - [`BTreeMap::get_key_value`]
2132 - [`HashMap::get_key_value`]
2133 - [`Option::as_deref_mut`]
2134 - [`Option::as_deref`]
2135 - [`Option::flatten`]
2136 - [`UdpSocket::peer_addr`]
2137 - [`f32::to_be_bytes`]
2138 - [`f32::to_le_bytes`]
2139 - [`f32::to_ne_bytes`]
2140 - [`f64::to_be_bytes`]
2141 - [`f64::to_le_bytes`]
2142 - [`f64::to_ne_bytes`]
2143 - [`f32::from_be_bytes`]
2144 - [`f32::from_le_bytes`]
2145 - [`f32::from_ne_bytes`]
2146 - [`f64::from_be_bytes`]
2147 - [`f64::from_le_bytes`]
2148 - [`f64::from_ne_bytes`]
2155 - [Cargo will now always display warnings, rather than only on
2156 fresh builds.][cargo/7450]
2157 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2158 now produce an error.][cargo/7507] Previously these flags were ignored.
2159 - [You can now publish `dev-dependencies` without including
2160 a `version`.][cargo/7333]
2164 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2165 when running documentation tests with `rustdoc`.][63803]
2169 - [As previously announced, any previous NLL warnings in the 2015 edition are
2170 now hard errors.][64221]
2171 - [The `include!` macro will now warn if it failed to include the
2172 entire file.][64284] The `include!` macro unintentionally only includes the
2173 first _expression_ in a file, and this can be unintuitive. This will become
2174 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2175 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2176 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2177 or `extern` blocks now correctly emits a hard error.
2179 [65294]: https://github.com/rust-lang/rust/pull/65294/
2180 [66103]: https://github.com/rust-lang/rust/pull/66103/
2181 [65843]: https://github.com/rust-lang/rust/pull/65843/
2182 [65188]: https://github.com/rust-lang/rust/pull/65188/
2183 [65092]: https://github.com/rust-lang/rust/pull/65092/
2184 [64589]: https://github.com/rust-lang/rust/pull/64589/
2185 [64639]: https://github.com/rust-lang/rust/pull/64639/
2186 [64221]: https://github.com/rust-lang/rust/pull/64221/
2187 [64284]: https://github.com/rust-lang/rust/pull/64284/
2188 [63931]: https://github.com/rust-lang/rust/pull/63931/
2189 [64035]: https://github.com/rust-lang/rust/pull/64035/
2190 [63674]: https://github.com/rust-lang/rust/pull/63674/
2191 [63803]: https://github.com/rust-lang/rust/pull/63803/
2192 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2193 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2194 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2195 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2196 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2197 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2198 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2199 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2200 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2201 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2202 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2203 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2204 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2205 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2206 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2207 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2208 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2209 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2210 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2211 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2212 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2213 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2214 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2215 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2216 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2217 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2220 Version 1.39.0 (2019-11-07)
2221 ===========================
2225 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2226 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2227 - [You can now use certain attributes on function, closure, and function pointer
2228 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2229 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2230 attributes applied to items. e.g.
2233 #[cfg(windows)] slice: &[u16],
2234 #[cfg(not(windows))] slice: &[u8],
2239 - [You can now take shared references to bind-by-move patterns in the `if` guards
2240 of `match` arms.][63118] e.g.
2243 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2247 // ---- `nums` is bound by move.
2248 if nums.iter().sum::<u8>() == 10
2249 // ^------ `.iter()` implicitly takes a reference to `nums`.
2252 // ----------- Legal as `nums` was bound by move and so we have ownership.
2254 _ => unreachable!(),
2263 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2264 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2265 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2266 **Note** Cargo currently doesn't use this feature. Refer to
2267 [cargo#7315][cargo/7315] to track this feature's progress.
2268 - [You can now pass `--show-output` argument to test binaries to print the
2269 output of successful tests.][62600]
2272 \* Refer to Rust's [platform support page][platform-support-doc] for more
2273 information on Rust's tiered platform support.
2277 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2278 - [`LinkedList::new` is now a `const` function.][63684]
2279 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2280 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2281 now `const`.][63786]
2285 - [`Pin::into_inner`]
2286 - [`Instant::checked_duration_since`]
2287 - [`Instant::saturating_duration_since`]
2291 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2292 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2293 `--all` is now deprecated.
2297 - [You can now pass `-Clinker` to rustdoc to control the linker used
2298 for compiling doctests.][63834]
2302 - [Code that was previously accepted by the old borrow checker, but rejected by
2303 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2304 previously a warning, and will also become a hard error in the Rust 2015
2305 edition in the 1.40.0 release.
2306 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2307 run tests.][63827] This should improve performance when running a large
2309 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2310 recommended to use the `?` operator instead.
2311 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2314 [62600]: https://github.com/rust-lang/rust/pull/62600/
2315 [62672]: https://github.com/rust-lang/rust/pull/62672/
2316 [63118]: https://github.com/rust-lang/rust/pull/63118/
2317 [63209]: https://github.com/rust-lang/rust/pull/63209/
2318 [63402]: https://github.com/rust-lang/rust/pull/63402/
2319 [63565]: https://github.com/rust-lang/rust/pull/63565/
2320 [63595]: https://github.com/rust-lang/rust/pull/63595/
2321 [63684]: https://github.com/rust-lang/rust/pull/63684/
2322 [63698]: https://github.com/rust-lang/rust/pull/63698/
2323 [63770]: https://github.com/rust-lang/rust/pull/63770/
2324 [63786]: https://github.com/rust-lang/rust/pull/63786/
2325 [63827]: https://github.com/rust-lang/rust/pull/63827/
2326 [63834]: https://github.com/rust-lang/rust/pull/63834/
2327 [63927]: https://github.com/rust-lang/rust/pull/63927/
2328 [63933]: https://github.com/rust-lang/rust/pull/63933/
2329 [63934]: https://github.com/rust-lang/rust/pull/63934/
2330 [63938]: https://github.com/rust-lang/rust/pull/63938/
2331 [63940]: https://github.com/rust-lang/rust/pull/63940/
2332 [63941]: https://github.com/rust-lang/rust/pull/63941/
2333 [63945]: https://github.com/rust-lang/rust/pull/63945/
2334 [64010]: https://github.com/rust-lang/rust/pull/64010/
2335 [64028]: https://github.com/rust-lang/rust/pull/64028/
2336 [64334]: https://github.com/rust-lang/rust/pull/64334/
2337 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2338 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2339 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2340 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2341 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2342 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2344 Version 1.38.0 (2019-09-26)
2345 ==========================
2349 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2350 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2354 - [Added pipelined compilation support to `rustc`.][62766] This will
2355 improve compilation times in some cases. For further information please refer
2356 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2357 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2358 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2359 `x86_64-uwp-windows-msvc` targets.][60260]
2360 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2361 `armv7-unknown-linux-musleabi` targets.][63107]
2362 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2363 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2364 - [Upgraded to LLVM 9.][62592]
2366 \* Refer to Rust's [platform support page][platform-support-doc] for more
2367 information on Rust's tiered platform support.
2371 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2372 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2373 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2374 is available at `std::clone::Clone`). This also makes all built-in macros
2375 available in `std`/`core` root. e.g. `std::include_bytes!`.
2376 - [`str::Chars` now implements `Debug`.][63000]
2377 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2378 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2379 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2380 - [Added euclidean remainder and division operations (`div_euclid`,
2381 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2382 `overflowing`, and `wrapping` versions are available for all
2384 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2385 `PartialEq`.][61491]
2386 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2390 - [`<*const T>::cast`]
2391 - [`<*mut T>::cast`]
2392 - [`Duration::as_secs_f32`]
2393 - [`Duration::as_secs_f64`]
2394 - [`Duration::div_f32`]
2395 - [`Duration::div_f64`]
2396 - [`Duration::from_secs_f32`]
2397 - [`Duration::from_secs_f64`]
2398 - [`Duration::mul_f32`]
2399 - [`Duration::mul_f64`]
2400 - [`any::type_name`]
2404 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2405 - [You can now pass the `--features` option multiple times to enable
2406 multiple features.][cargo/7084]
2411 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2415 - [`rustc` will now warn about some incorrect uses of
2416 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2420 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2422 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2423 issues][62896] with certain crates such as libc.
2425 [60260]: https://github.com/rust-lang/rust/pull/60260/
2426 [61457]: https://github.com/rust-lang/rust/pull/61457/
2427 [61491]: https://github.com/rust-lang/rust/pull/61491/
2428 [61884]: https://github.com/rust-lang/rust/pull/61884/
2429 [61953]: https://github.com/rust-lang/rust/pull/61953/
2430 [62042]: https://github.com/rust-lang/rust/pull/62042/
2431 [62528]: https://github.com/rust-lang/rust/pull/62528/
2432 [62583]: https://github.com/rust-lang/rust/pull/62583/
2433 [62735]: https://github.com/rust-lang/rust/pull/62735/
2434 [62766]: https://github.com/rust-lang/rust/pull/62766/
2435 [62784]: https://github.com/rust-lang/rust/pull/62784/
2436 [62592]: https://github.com/rust-lang/rust/pull/62592/
2437 [62785]: https://github.com/rust-lang/rust/issues/62785/
2438 [62814]: https://github.com/rust-lang/rust/pull/62814/
2439 [62896]: https://github.com/rust-lang/rust/issues/62896/
2440 [63000]: https://github.com/rust-lang/rust/pull/63000/
2441 [63056]: https://github.com/rust-lang/rust/pull/63056/
2442 [63107]: https://github.com/rust-lang/rust/pull/63107/
2443 [63346]: https://github.com/rust-lang/rust/pull/63346/
2444 [63421]: https://github.com/rust-lang/rust/pull/63421/
2445 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2446 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2447 [63048]: https://github.com/rust-lang/rust/pull/63048
2448 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2449 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2450 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2451 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2452 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2453 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2454 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2455 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2456 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2457 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2458 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2459 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2460 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2462 Version 1.37.0 (2019-08-15)
2463 ==========================
2467 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2468 [`Box`][62228], or an [array][62235] and unused.
2469 - [You can now use the `cfg` and `cfg_attr` attributes on
2470 generic parameters.][61547]
2471 - [You can now use enum variants through type alias.][61682] e.g. You can
2472 write the following:
2474 type MyOption = Option<u8>;
2476 fn increment_or_zero(x: MyOption) -> u8 {
2478 MyOption::Some(y) => y + 1,
2479 MyOption::None => 0,
2483 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2484 `const _: u32 = 5;`.
2485 - [You can now use `#[repr(align(X)]` on enums.][61229]
2486 - [The `?` Kleene macro operator is now available in the
2487 2015 edition.][60932]
2491 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2492 and `-C profile-use` flags.][61268] For more information on how to use profile
2493 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2494 - [The `rust-lldb` wrapper script should now work again.][61827]
2498 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2502 - [`BufReader::buffer`]
2503 - [`BufWriter::buffer`]
2504 - [`Cell::from_mut`]
2505 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2506 - [`DoubleEndedIterator::nth_back`]
2508 - [`Wrapping::reverse_bits`]
2509 - [`i128::reverse_bits`]
2510 - [`i16::reverse_bits`]
2511 - [`i32::reverse_bits`]
2512 - [`i64::reverse_bits`]
2513 - [`i8::reverse_bits`]
2514 - [`isize::reverse_bits`]
2515 - [`slice::copy_within`]
2516 - [`u128::reverse_bits`]
2517 - [`u16::reverse_bits`]
2518 - [`u32::reverse_bits`]
2519 - [`u64::reverse_bits`]
2520 - [`u8::reverse_bits`]
2521 - [`usize::reverse_bits`]
2525 - [`Cargo.lock` files are now included by default when publishing executable crates
2526 with executables.][cargo/7026]
2527 - [You can now specify `default-run="foo"` in `[package]` to specify the
2528 default executable to use for `cargo run`.][cargo/7056]
2535 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2536 Please transition your code to using the `..=` syntax for inclusive
2538 - [Using a trait object without the `dyn` will now warn by default.][61203]
2539 Please transition your code to use `dyn Trait` for trait objects instead.
2541 [62228]: https://github.com/rust-lang/rust/pull/62228/
2542 [62235]: https://github.com/rust-lang/rust/pull/62235/
2543 [61802]: https://github.com/rust-lang/rust/pull/61802/
2544 [61827]: https://github.com/rust-lang/rust/pull/61827/
2545 [61547]: https://github.com/rust-lang/rust/pull/61547/
2546 [61682]: https://github.com/rust-lang/rust/pull/61682/
2547 [61268]: https://github.com/rust-lang/rust/pull/61268/
2548 [61342]: https://github.com/rust-lang/rust/pull/61342/
2549 [61347]: https://github.com/rust-lang/rust/pull/61347/
2550 [61100]: https://github.com/rust-lang/rust/pull/61100/
2551 [61203]: https://github.com/rust-lang/rust/pull/61203/
2552 [61229]: https://github.com/rust-lang/rust/pull/61229/
2553 [60932]: https://github.com/rust-lang/rust/pull/60932/
2554 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2555 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2556 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2557 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2558 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2559 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2560 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2561 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2562 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2563 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2564 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2565 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2566 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2567 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2568 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2569 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2570 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2571 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2572 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2573 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2574 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2575 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2576 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2577 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2580 Version 1.36.0 (2019-07-04)
2581 ==========================
2585 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2586 - [The order of traits in trait objects no longer affects the semantics of that
2587 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2588 `dyn fmt::Debug + Send`, where this was previously not the case.
2592 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2593 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2594 - [`mem::needs_drop` is now available as a const fn.][60364]
2595 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2596 - [`String` now implements `BorrowMut<str>`.][60404]
2597 - [`io::Cursor` now implements `Default`.][60234]
2598 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2599 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2600 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2601 environment has access to heap memory allocation.
2602 - [`String` now implements `From<&String>`.][59825]
2603 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2604 return a tuple of each argument when there is multiple arguments.
2605 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2610 - [`VecDeque::rotate_left`]
2611 - [`VecDeque::rotate_right`]
2612 - [`Iterator::copied`]
2614 - [`io::IoSliceMut`]
2615 - [`Read::read_vectored`]
2616 - [`Write::write_vectored`]
2617 - [`str::as_mut_ptr`]
2618 - [`mem::MaybeUninit`]
2619 - [`pointer::align_offset`]
2620 - [`future::Future`]
2622 - [`task::RawWaker`]
2623 - [`task::RawWakerVTable`]
2629 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2630 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2632 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2636 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2643 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2644 longer recommended, and will be deprecated in 1.39.0.
2646 [60318]: https://github.com/rust-lang/rust/pull/60318/
2647 [60364]: https://github.com/rust-lang/rust/pull/60364/
2648 [60370]: https://github.com/rust-lang/rust/pull/60370/
2649 [60404]: https://github.com/rust-lang/rust/pull/60404/
2650 [60234]: https://github.com/rust-lang/rust/pull/60234/
2651 [60244]: https://github.com/rust-lang/rust/pull/60244/
2652 [58623]: https://github.com/rust-lang/rust/pull/58623/
2653 [59648]: https://github.com/rust-lang/rust/pull/59648/
2654 [59675]: https://github.com/rust-lang/rust/pull/59675/
2655 [59825]: https://github.com/rust-lang/rust/pull/59825/
2656 [59826]: https://github.com/rust-lang/rust/pull/59826/
2657 [59445]: https://github.com/rust-lang/rust/pull/59445/
2658 [59114]: https://github.com/rust-lang/rust/pull/59114/
2659 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2660 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2661 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2662 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2663 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2664 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2665 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2666 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2667 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2668 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2669 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2670 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2671 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2672 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2673 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2674 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2675 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2676 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2677 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2678 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2681 Version 1.35.0 (2019-05-23)
2682 ==========================
2686 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2687 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2688 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2690 unsafe fn call_unsafe(func: unsafe fn()) {
2695 unsafe { call_unsafe(|| {}); }
2702 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2703 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2704 - [Added the `wasm32-unknown-wasi` target.][59464]
2709 - [`Thread` will now show its ID in `Debug` output.][59460]
2710 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2711 - [`alloc::System` now implements `Default`.][59451]
2712 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2714 - [`char::{ToLowercase, ToUppercase}` now
2715 implement `ExactSizeIterator`.][58778]
2716 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2717 - [Removed the `Read` trait bounds
2718 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2719 - [You can now call the `dbg!` macro without any parameters to print the file
2720 and line where it is called.][57847]
2721 - [In place ASCII case conversions are now up to 4× faster.][59283]
2722 e.g. `str::make_ascii_lowercase`
2723 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2730 - [`RefCell::replace_with`]
2731 - [`RefCell::map_split`]
2733 - [`Range::contains`]
2734 - [`RangeFrom::contains`]
2735 - [`RangeTo::contains`]
2736 - [`RangeInclusive::contains`]
2737 - [`RangeToInclusive::contains`]
2738 - [`Option::copied`]
2742 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2743 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2748 - [The Rust toolchain is now available natively for musl based distros.][58575]
2750 [59460]: https://github.com/rust-lang/rust/pull/59460/
2751 [59464]: https://github.com/rust-lang/rust/pull/59464/
2752 [59500]: https://github.com/rust-lang/rust/pull/59500/
2753 [59512]: https://github.com/rust-lang/rust/pull/59512/
2754 [59580]: https://github.com/rust-lang/rust/pull/59580/
2755 [59283]: https://github.com/rust-lang/rust/pull/59283/
2756 [59451]: https://github.com/rust-lang/rust/pull/59451/
2757 [59076]: https://github.com/rust-lang/rust/pull/59076/
2758 [58778]: https://github.com/rust-lang/rust/pull/58778/
2759 [58717]: https://github.com/rust-lang/rust/pull/58717/
2760 [58369]: https://github.com/rust-lang/rust/pull/58369/
2761 [58423]: https://github.com/rust-lang/rust/pull/58423/
2762 [58080]: https://github.com/rust-lang/rust/pull/58080/
2763 [57847]: https://github.com/rust-lang/rust/pull/57847/
2764 [58575]: https://github.com/rust-lang/rust/pull/58575
2765 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2766 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2767 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2768 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2769 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2770 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2771 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2772 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2773 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2774 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2775 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2776 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2778 Version 1.34.2 (2019-05-14)
2779 ===========================
2781 * [Destabilize the `Error::type_id` function due to a security
2782 vulnerability][60785] ([CVE-2019-12083])
2784 [60785]: https://github.com/rust-lang/rust/pull/60785
2785 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2787 Version 1.34.1 (2019-04-25)
2788 ===========================
2790 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2791 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2792 * [Fix Clippy panic when checking some macros][clippy/3805]
2794 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2795 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2796 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2798 Version 1.34.0 (2019-04-11)
2799 ==========================
2803 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2804 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2806 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2807 `#[attr{}]` procedural macros.][57367]
2808 - [You can now write `extern crate self as foo;`][57407] to import your
2809 crate's root into the extern prelude.
2814 - [You can now target `riscv64imac-unknown-none-elf` and
2815 `riscv64gc-unknown-none-elf`.][58406]
2816 - [You can now enable linker plugin LTO optimisations with
2817 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2818 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2820 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2825 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2826 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2827 the `Hash` trait to create an iterator.
2828 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2829 methods.][58421] Most notably you no longer require the `Ord` trait to create
2831 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2832 for all numeric types.][58044]
2833 - [Indexing a `str` is now generic over all types that
2834 implement `SliceIndex<str>`.][57604]
2835 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2836 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2837 produce a warning if their returning type is unused.
2838 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2839 `overflowing_pow` are now available for all numeric types.][57873] These are
2840 equivalent to methods such as `wrapping_add` for the `pow` operation.
2848 * [`Error::type_id`]
2849 * [`atomic::AtomicI16`]
2850 * [`atomic::AtomicI32`]
2851 * [`atomic::AtomicI64`]
2852 * [`atomic::AtomicI8`]
2853 * [`atomic::AtomicU16`]
2854 * [`atomic::AtomicU32`]
2855 * [`atomic::AtomicU64`]
2856 * [`atomic::AtomicU8`]
2857 * [`convert::Infallible`]
2858 * [`convert::TryFrom`]
2859 * [`convert::TryInto`]
2861 * [`iter::successors`]
2862 * [`num::NonZeroI128`]
2863 * [`num::NonZeroI16`]
2864 * [`num::NonZeroI32`]
2865 * [`num::NonZeroI64`]
2866 * [`num::NonZeroI8`]
2867 * [`num::NonZeroIsize`]
2868 * [`slice::sort_by_cached_key`]
2869 * [`str::escape_debug`]
2870 * [`str::escape_default`]
2871 * [`str::escape_unicode`]
2872 * [`str::split_ascii_whitespace`]
2875 * [`Instant::checked_add`]
2876 * [`Instant::checked_sub`]
2877 * [`SystemTime::checked_add`]
2878 * [`SystemTime::checked_sub`]
2882 - [You can now use alternative registries to crates.io.][cargo/6654]
2886 - [You can now use the `?` operator in your documentation tests without manually
2887 adding `fn main() -> Result<(), _> {}`.][56470]
2891 - [`Command::before_exec` is being replaced by the unsafe method
2892 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2893 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2894 can now use `const` functions in `static` variables.
2896 [58370]: https://github.com/rust-lang/rust/pull/58370/
2897 [58406]: https://github.com/rust-lang/rust/pull/58406/
2898 [58421]: https://github.com/rust-lang/rust/pull/58421/
2899 [58166]: https://github.com/rust-lang/rust/pull/58166/
2900 [58044]: https://github.com/rust-lang/rust/pull/58044/
2901 [58057]: https://github.com/rust-lang/rust/pull/58057/
2902 [58059]: https://github.com/rust-lang/rust/pull/58059/
2903 [57809]: https://github.com/rust-lang/rust/pull/57809/
2904 [57873]: https://github.com/rust-lang/rust/pull/57873/
2905 [57604]: https://github.com/rust-lang/rust/pull/57604/
2906 [57367]: https://github.com/rust-lang/rust/pull/57367/
2907 [57407]: https://github.com/rust-lang/rust/pull/57407/
2908 [57425]: https://github.com/rust-lang/rust/pull/57425/
2909 [57106]: https://github.com/rust-lang/rust/pull/57106/
2910 [56470]: https://github.com/rust-lang/rust/pull/56470/
2911 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2912 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2913 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2914 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2915 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2916 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2917 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2918 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2919 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2920 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2921 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2922 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2923 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2924 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2925 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2926 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2927 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2928 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2929 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2930 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2931 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2932 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2933 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2934 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2935 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2936 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2937 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2938 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2939 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2940 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2941 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2944 Version 1.33.0 (2019-02-28)
2945 ==========================
2949 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2950 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2951 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2952 E.g. You can have match statement on a `u8` that covers `0..=255` and
2953 you would no longer be required to have a `_ => unreachable!()` case.
2954 - [You can now have multiple patterns in `if let` and `while let`
2955 expressions.][57532] You can do this with the same syntax as a `match`
2965 let state = Creature::Crab("Ferris");
2967 if let Creature::Crab(name) | Creature::Person(name) = state {
2968 println!("This creature's name is: {}", name);
2972 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2973 this feature will by default produce a warning as this behaviour can be
2974 unintuitive. E.g. `if let _ = 5 {}`
2975 - [You can now use `let` bindings, assignments, expression statements,
2976 and irrefutable pattern destructuring in const functions.][57175]
2977 - [You can now call unsafe const functions.][57067] E.g.
2979 const unsafe fn foo() -> i32 { 5 }
2980 const fn bar() -> i32 {
2984 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2985 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2986 - [You can now specify a specific alignment with the `#[repr(packed)]`
2987 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2988 with an alignment of 2 bytes and a size of 6 bytes.
2989 - [You can now import an item from a module as an `_`.][56303] This allows you to
2990 import a trait's impls, and not have the name in the namespace. E.g.
2992 use std::io::Read as _;
2994 // Allowed as there is only one `Read` in the module.
2997 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3001 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3002 command line argument.][56351]
3003 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3004 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3005 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3006 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3007 information on Rust's platform support.
3008 - [Added support for the `thumbv7neon-linux-androideabi` and
3009 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3010 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3014 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3015 functions for all numeric types.][57566]
3016 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3017 are now `const` functions for all numeric types.][57105]
3018 - [The methods `is_positive` and `is_negative` are now `const` functions for
3019 all signed numeric types.][57105]
3020 - [The `get` method for all `NonZero` types is now `const`.][57167]
3021 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3022 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3023 numeric types.][57234]
3024 - [`Ipv4Addr::new` is now a `const` function][57234]
3028 - [`unix::FileExt::read_exact_at`]
3029 - [`unix::FileExt::write_all_at`]
3030 - [`Option::transpose`]
3031 - [`Result::transpose`]
3032 - [`convert::identity`]
3035 - [`marker::PhantomPinned`]
3036 - [`Vec::resize_with`]
3037 - [`VecDeque::resize_with`]
3038 - [`Duration::as_millis`]
3039 - [`Duration::as_micros`]
3040 - [`Duration::as_nanos`]
3045 - [You can now publish crates that require a feature flag to compile with
3046 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3047 - [Cargo should now rebuild a crate if a file was modified during the initial
3052 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3053 are now deprecated in the standard library, and their usage will now produce a warning.
3054 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3056 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3058 - [Libtest no longer creates a new thread for each test when
3059 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3061 [55982]: https://github.com/rust-lang/rust/pull/55982/
3062 [56243]: https://github.com/rust-lang/rust/pull/56243
3063 [56303]: https://github.com/rust-lang/rust/pull/56303/
3064 [56351]: https://github.com/rust-lang/rust/pull/56351/
3065 [56362]: https://github.com/rust-lang/rust/pull/56362
3066 [56642]: https://github.com/rust-lang/rust/pull/56642/
3067 [56769]: https://github.com/rust-lang/rust/pull/56769/
3068 [56805]: https://github.com/rust-lang/rust/pull/56805
3069 [56947]: https://github.com/rust-lang/rust/pull/56947/
3070 [57049]: https://github.com/rust-lang/rust/pull/57049/
3071 [57067]: https://github.com/rust-lang/rust/pull/57067/
3072 [57105]: https://github.com/rust-lang/rust/pull/57105
3073 [57130]: https://github.com/rust-lang/rust/pull/57130/
3074 [57167]: https://github.com/rust-lang/rust/pull/57167/
3075 [57175]: https://github.com/rust-lang/rust/pull/57175/
3076 [57234]: https://github.com/rust-lang/rust/pull/57234/
3077 [57332]: https://github.com/rust-lang/rust/pull/57332/
3078 [57465]: https://github.com/rust-lang/rust/pull/57465/
3079 [57532]: https://github.com/rust-lang/rust/pull/57532/
3080 [57535]: https://github.com/rust-lang/rust/pull/57535/
3081 [57566]: https://github.com/rust-lang/rust/pull/57566/
3082 [57615]: https://github.com/rust-lang/rust/pull/57615/
3083 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3084 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3085 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3086 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3087 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3088 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3089 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3090 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3091 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3092 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3093 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3094 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3095 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3096 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3097 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3098 [platform-support]: https://forge.rust-lang.org/platform-support.html
3100 Version 1.32.0 (2019-01-17)
3101 ==========================
3106 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3107 operator allows you to specify zero or one repetitions similar to the `*` and
3109 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3110 now always resolve to the item (`enum`, `struct`, etc.) available in the
3111 module if present, before resolving to a external crate or an item the prelude.][56759]
3114 enum Color { Red, Green, Blue }
3120 - [You can now match against `PhantomData<T>` types.][55837]
3121 - [You can now match against literals in macros with the `literal`
3122 specifier.][56072] This will match against a literal of any type.
3123 E.g. `1`, `'A'`, `"Hello World"`
3124 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3126 struct Point(i32, i32);
3129 pub fn new(x: i32, y: i32) -> Self {
3133 pub fn is_origin(&self) -> bool {
3141 - [Self can also now be used in type definitions.][56366] E.g.
3145 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3148 Cons(T, Box<Self>) // likewise here
3151 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3152 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3156 - [The default allocator has changed from jemalloc to the default allocator on
3157 your system.][55238] The compiler itself on Linux & macOS will still use
3158 jemalloc, but programs compiled with it will use the system allocator.
3159 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3163 - [`PathBuf` now implements `FromStr`.][55148]
3164 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3165 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3166 easily debug expressions in your rust program. E.g.
3169 let b = dbg!(a * 2) + 1;
3170 // ^-- prints: [src/main.rs:4] a * 2 = 4
3174 The following APIs are now `const` functions and can be used in a
3178 - [`UnsafeCell::get`]
3179 - [`char::is_ascii`]
3181 - [`ManuallyDrop::new`]
3182 - [`ManuallyDrop::into_inner`]
3183 - [`RangeInclusive::start`]
3184 - [`RangeInclusive::end`]
3185 - [`NonNull::as_ptr`]
3188 - [`Duration::as_secs`]
3189 - [`Duration::subsec_millis`]
3190 - [`Duration::subsec_micros`]
3191 - [`Duration::subsec_nanos`]
3193 - [`Ipv4Addr::is_unspecified`]
3195 - [`Ipv6Addr::octets`]
3199 - [`i8::to_be_bytes`]
3200 - [`i8::to_le_bytes`]
3201 - [`i8::to_ne_bytes`]
3202 - [`i8::from_be_bytes`]
3203 - [`i8::from_le_bytes`]
3204 - [`i8::from_ne_bytes`]
3205 - [`i16::to_be_bytes`]
3206 - [`i16::to_le_bytes`]
3207 - [`i16::to_ne_bytes`]
3208 - [`i16::from_be_bytes`]
3209 - [`i16::from_le_bytes`]
3210 - [`i16::from_ne_bytes`]
3211 - [`i32::to_be_bytes`]
3212 - [`i32::to_le_bytes`]
3213 - [`i32::to_ne_bytes`]
3214 - [`i32::from_be_bytes`]
3215 - [`i32::from_le_bytes`]
3216 - [`i32::from_ne_bytes`]
3217 - [`i64::to_be_bytes`]
3218 - [`i64::to_le_bytes`]
3219 - [`i64::to_ne_bytes`]
3220 - [`i64::from_be_bytes`]
3221 - [`i64::from_le_bytes`]
3222 - [`i64::from_ne_bytes`]
3223 - [`i128::to_be_bytes`]
3224 - [`i128::to_le_bytes`]
3225 - [`i128::to_ne_bytes`]
3226 - [`i128::from_be_bytes`]
3227 - [`i128::from_le_bytes`]
3228 - [`i128::from_ne_bytes`]
3229 - [`isize::to_be_bytes`]
3230 - [`isize::to_le_bytes`]
3231 - [`isize::to_ne_bytes`]
3232 - [`isize::from_be_bytes`]
3233 - [`isize::from_le_bytes`]
3234 - [`isize::from_ne_bytes`]
3235 - [`u8::to_be_bytes`]
3236 - [`u8::to_le_bytes`]
3237 - [`u8::to_ne_bytes`]
3238 - [`u8::from_be_bytes`]
3239 - [`u8::from_le_bytes`]
3240 - [`u8::from_ne_bytes`]
3241 - [`u16::to_be_bytes`]
3242 - [`u16::to_le_bytes`]
3243 - [`u16::to_ne_bytes`]
3244 - [`u16::from_be_bytes`]
3245 - [`u16::from_le_bytes`]
3246 - [`u16::from_ne_bytes`]
3247 - [`u32::to_be_bytes`]
3248 - [`u32::to_le_bytes`]
3249 - [`u32::to_ne_bytes`]
3250 - [`u32::from_be_bytes`]
3251 - [`u32::from_le_bytes`]
3252 - [`u32::from_ne_bytes`]
3253 - [`u64::to_be_bytes`]
3254 - [`u64::to_le_bytes`]
3255 - [`u64::to_ne_bytes`]
3256 - [`u64::from_be_bytes`]
3257 - [`u64::from_le_bytes`]
3258 - [`u64::from_ne_bytes`]
3259 - [`u128::to_be_bytes`]
3260 - [`u128::to_le_bytes`]
3261 - [`u128::to_ne_bytes`]
3262 - [`u128::from_be_bytes`]
3263 - [`u128::from_le_bytes`]
3264 - [`u128::from_ne_bytes`]
3265 - [`usize::to_be_bytes`]
3266 - [`usize::to_le_bytes`]
3267 - [`usize::to_ne_bytes`]
3268 - [`usize::from_be_bytes`]
3269 - [`usize::from_le_bytes`]
3270 - [`usize::from_ne_bytes`]
3274 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3275 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3279 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3283 - [The argument types for AVX's
3284 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3285 been changed from `*const` to `*mut` as the previous implementation
3289 [55148]: https://github.com/rust-lang/rust/pull/55148/
3290 [55238]: https://github.com/rust-lang/rust/pull/55238/
3291 [55280]: https://github.com/rust-lang/rust/pull/55280/
3292 [55610]: https://github.com/rust-lang/rust/pull/55610/
3293 [55663]: https://github.com/rust-lang/rust/pull/55663/
3294 [55702]: https://github.com/rust-lang/rust/pull/55702/
3295 [55837]: https://github.com/rust-lang/rust/pull/55837/
3296 [55843]: https://github.com/rust-lang/rust/pull/55843/
3297 [56072]: https://github.com/rust-lang/rust/pull/56072/
3298 [56245]: https://github.com/rust-lang/rust/pull/56245/
3299 [56365]: https://github.com/rust-lang/rust/pull/56365/
3300 [56366]: https://github.com/rust-lang/rust/pull/56366/
3301 [56395]: https://github.com/rust-lang/rust/pull/56395/
3302 [56759]: https://github.com/rust-lang/rust/pull/56759/
3303 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3304 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3305 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3306 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3307 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3308 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3309 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3310 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3311 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3312 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3313 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3314 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3315 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3316 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3317 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3318 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3319 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3320 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3321 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3322 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3323 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3324 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3325 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3326 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3327 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3328 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3329 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3330 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3331 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3332 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3333 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3334 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3335 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3336 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3337 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3338 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3339 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3340 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3341 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3342 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3343 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3344 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3345 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3346 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3347 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3348 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3349 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3350 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3351 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3352 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3353 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3354 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3355 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3356 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3357 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3358 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3359 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3360 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3361 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3362 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3363 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3364 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3365 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3366 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3367 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3368 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3369 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3370 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3371 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3372 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3373 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3374 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3375 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3376 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3377 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3378 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3379 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3380 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3381 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3382 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3383 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3384 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3385 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3386 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3387 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3388 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3389 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3390 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3391 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3392 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3393 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3394 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3395 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3398 Version 1.31.1 (2018-12-20)
3399 ===========================
3401 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3402 - [Fix broken go-to-definition in RLS][rls/1171]
3403 - [Fix infinite loop on hover in RLS][rls/1170]
3405 [56562]: https://github.com/rust-lang/rust/pull/56562
3406 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3407 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3409 Version 1.31.0 (2018-12-06)
3410 ==========================
3414 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3415 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3416 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3417 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3419 - [You can now define and use `const` functions.][54835] These are currently
3420 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3421 [language reference][const-reference] for what exactly is available.
3422 - [You can now use tool lints, which allow you to scope lints from external
3423 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3424 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3425 a crate, not just in exported functions.][54451]
3426 - [You can now use parentheses in pattern matches.][54497]
3430 - [Updated musl to 1.1.20][54430]
3434 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3435 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3436 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3437 into `Option<&mut T>` using the `From` trait.][53218]
3438 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3443 - [`slice::align_to`]
3444 - [`slice::align_to_mut`]
3445 - [`slice::chunks_exact`]
3446 - [`slice::chunks_exact_mut`]
3447 - [`slice::rchunks`]
3448 - [`slice::rchunks_mut`]
3449 - [`slice::rchunks_exact`]
3450 - [`slice::rchunks_exact_mut`]
3451 - [`Option::replace`]
3455 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3456 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3457 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3459 [52813]: https://github.com/rust-lang/rust/pull/52813/
3460 [53218]: https://github.com/rust-lang/rust/pull/53218/
3461 [53555]: https://github.com/rust-lang/rust/issues/53555/
3462 [54057]: https://github.com/rust-lang/rust/pull/54057/
3463 [54240]: https://github.com/rust-lang/rust/pull/54240/
3464 [54430]: https://github.com/rust-lang/rust/pull/54430/
3465 [54451]: https://github.com/rust-lang/rust/pull/54451/
3466 [54497]: https://github.com/rust-lang/rust/pull/54497/
3467 [54778]: https://github.com/rust-lang/rust/pull/54778/
3468 [54835]: https://github.com/rust-lang/rust/pull/54835/
3469 [54870]: https://github.com/rust-lang/rust/pull/54870/
3470 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3471 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3472 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3473 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3474 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3475 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3476 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3477 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3478 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3479 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3480 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3481 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3482 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3483 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3485 Version 1.30.1 (2018-11-08)
3486 ===========================
3488 - [Fixed overflow ICE in rustdoc][54199]
3489 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3491 [54199]: https://github.com/rust-lang/rust/pull/54199
3492 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3494 Version 1.30.0 (2018-10-25)
3495 ==========================
3499 - [Procedural macros are now available.][52081] These kinds of macros allow for
3500 more powerful code generation. There is a [new chapter available][proc-macros]
3501 in the Rust Programming Language book that goes further in depth.
3502 - [You can now use keywords as identifiers using the raw identifiers
3503 syntax (`r#`),][53236] e.g. `let r#for = true;`
3504 - [Using anonymous parameters in traits is now deprecated with a warning and
3505 will be a hard error in the 2018 edition.][53272]
3506 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3507 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3508 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3509 Previously, using a external crate in a module without a use statement
3510 required `let json = ::serde_json::from_str(foo);` but can now be written
3511 as `let json = serde_json::from_str(foo);`.
3512 - [You can now apply the `#[used]` attribute to static items to prevent the
3513 compiler from optimising them away, even if they appear to be unused,][51363]
3514 e.g. `#[used] static FOO: u32 = 1;`
3515 - [You can now import and reexport macros from other crates with the `use`
3516 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3517 the root module of the crate. If your macro relies on calling other local
3518 macros, it is recommended to export with the
3519 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3521 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3522 using the `vis` specifier.][53370]
3523 - [Non-macro attributes now allow all forms of literals, not just
3524 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3525 write `#[attr(true)]`.
3526 - [You can now specify a function to handle a panic in the Rust runtime with the
3527 `#[panic_handler]` attribute.][51366]
3531 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3532 - [Added the `aarch64-unknown-netbsd` target][53165]
3533 - [Upgraded to LLVM 8.][53611]
3537 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3541 - [`Ipv4Addr::BROADCAST`]
3542 - [`Ipv4Addr::LOCALHOST`]
3543 - [`Ipv4Addr::UNSPECIFIED`]
3544 - [`Ipv6Addr::LOCALHOST`]
3545 - [`Ipv6Addr::UNSPECIFIED`]
3546 - [`Iterator::find_map`]
3548 The following methods are replacement methods for `trim_left`, `trim_right`,
3549 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3551 - [`str::trim_end_matches`]
3553 - [`str::trim_start_matches`]
3554 - [`str::trim_start`]
3558 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3559 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3560 equivalent to calling `rustdoc --error-format=json`.
3561 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3565 - [`rustdoc` allows you to specify what edition to treat your code as with the
3566 `--edition` option.][54057]
3567 - [`rustdoc` now has the `--color` (specify whether to output color) and
3568 `--error-format` (specify error format, e.g. `json`) options.][53003]
3569 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3570 debug symbols.][53774]
3571 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3572 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3574 [50911]: https://github.com/rust-lang/rust/pull/50911/
3575 [51363]: https://github.com/rust-lang/rust/pull/51363/
3576 [51366]: https://github.com/rust-lang/rust/pull/51366/
3577 [52081]: https://github.com/rust-lang/rust/pull/52081/
3578 [53003]: https://github.com/rust-lang/rust/pull/53003/
3579 [53033]: https://github.com/rust-lang/rust/pull/53033/
3580 [53044]: https://github.com/rust-lang/rust/pull/53044/
3581 [53165]: https://github.com/rust-lang/rust/pull/53165/
3582 [53611]: https://github.com/rust-lang/rust/pull/53611/
3583 [53213]: https://github.com/rust-lang/rust/pull/53213/
3584 [53236]: https://github.com/rust-lang/rust/pull/53236/
3585 [53272]: https://github.com/rust-lang/rust/pull/53272/
3586 [53370]: https://github.com/rust-lang/rust/pull/53370/
3587 [53459]: https://github.com/rust-lang/rust/pull/53459/
3588 [53774]: https://github.com/rust-lang/rust/pull/53774/
3589 [53822]: https://github.com/rust-lang/rust/pull/53822/
3590 [54057]: https://github.com/rust-lang/rust/pull/54057/
3591 [54146]: https://github.com/rust-lang/rust/pull/54146/
3592 [54404]: https://github.com/rust-lang/rust/pull/54404/
3593 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3594 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3595 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3596 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3598 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3599 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3600 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3601 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3602 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3603 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3604 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3605 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3606 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3607 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3610 Version 1.29.2 (2018-10-11)
3611 ===========================
3613 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3614 - The `rls-preview` component on the windows-gnu targets has been restored.
3616 [54639]: https://github.com/rust-lang/rust/pull/54639
3619 Version 1.29.1 (2018-09-25)
3620 ===========================
3625 - The standard library's `str::repeat` function contained an out of bounds write
3626 caused by an integer overflow. This has been fixed by deterministically
3627 panicking when an overflow happens.
3629 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3633 Version 1.29.0 (2018-09-13)
3634 ==========================
3638 - [Bumped minimum LLVM version to 5.0.][51899]
3639 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3640 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3641 - [Upgraded to LLVM 7.][51966]
3645 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3646 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3647 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3648 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3650 - [`Cell<T>` now allows `T` to be unsized.][50494]
3651 - [`SocketAddr` is now stable on Redox.][52656]
3656 - [`Iterator::flatten`]
3661 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3662 `--locked` to disable this behavior.
3663 - [`cargo-install` will now allow you to cross compile an install
3664 using `--target`.][cargo/5614]
3665 - [Added the `cargo-fix` subcommand to automatically move project code from
3666 2015 edition to 2018.][cargo/5723]
3667 - [`cargo doc` can now optionally document private types using the
3668 `--document-private-items` flag.][cargo/5543]
3672 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3673 the specified level to that level.][52354] For example `--cap-lints warn`
3674 will demote `deny` and `forbid` lints to `warn`.
3675 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3676 fails and `101` if there is a panic.][52197]
3677 - [A preview of clippy has been made available through rustup.][51122]
3678 You can install the preview with `rustup component add clippy-preview`.
3682 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3683 Use `str::get_unchecked(begin..end)` instead.
3684 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3685 Consider using the `home_dir` function from
3686 https://crates.io/crates/dirs instead.
3687 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3688 - [`cfg` attributes and `--cfg` command line flags are now more
3689 strictly validated.][53893]
3691 [53893]: https://github.com/rust-lang/rust/pull/53893/
3692 [52861]: https://github.com/rust-lang/rust/pull/52861/
3693 [51966]: https://github.com/rust-lang/rust/pull/51966/
3694 [52656]: https://github.com/rust-lang/rust/pull/52656/
3695 [52239]: https://github.com/rust-lang/rust/pull/52239/
3696 [52330]: https://github.com/rust-lang/rust/pull/52330/
3697 [52354]: https://github.com/rust-lang/rust/pull/52354/
3698 [52402]: https://github.com/rust-lang/rust/pull/52402/
3699 [52103]: https://github.com/rust-lang/rust/pull/52103/
3700 [52197]: https://github.com/rust-lang/rust/pull/52197/
3701 [51807]: https://github.com/rust-lang/rust/pull/51807/
3702 [51899]: https://github.com/rust-lang/rust/pull/51899/
3703 [51912]: https://github.com/rust-lang/rust/pull/51912/
3704 [51511]: https://github.com/rust-lang/rust/pull/51511/
3705 [51619]: https://github.com/rust-lang/rust/pull/51619/
3706 [51656]: https://github.com/rust-lang/rust/pull/51656/
3707 [51178]: https://github.com/rust-lang/rust/pull/51178/
3708 [51122]: https://github.com/rust-lang/rust/pull/51122
3709 [50494]: https://github.com/rust-lang/rust/pull/50494/
3710 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3711 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3712 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3713 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3714 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3715 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3716 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3719 Version 1.28.0 (2018-08-02)
3720 ===========================
3724 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3725 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3726 the inner type across Foreign Function Interface (FFI) boundaries.
3727 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3728 and can now be used as identifiers.][51196]
3729 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3730 stable.][51241] This will allow users to specify a global allocator for
3732 - [Unit test functions marked with the `#[test]` attribute can now return
3733 `Result<(), E: Debug>` in addition to `()`.][51298]
3734 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3735 allows macros to easily target lifetimes.
3739 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3740 prioritise making smaller binary sizes. `z` is the same as `s` with the
3741 exception that it does not vectorise loops, which typically results in an even
3743 - [The short error format is now stable.][49546] Specified with
3744 `--error-format=short` this option will provide a more compressed output of
3745 rust error messages.
3746 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3747 - [Reduced the number of allocations in the macro parser.][50855] This can
3748 improve compile times of macro heavy crates on average by 5%.
3752 - [Implemented `Default` for `&mut str`.][51306]
3753 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3754 - [Implemented `Extend` for `()`.][50234]
3755 - [The `Debug` implementation of `time::Duration` should now be more easily
3756 human readable.][50364] Previously a `Duration` of one second would printed as
3757 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3758 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3759 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3760 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3761 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3762 for `PathBuf`.][50170]
3763 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3764 and `Wrapping<i128>`.][50465]
3765 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3766 possible.][51050] This can provide up to a 40% speed increase.
3767 - [Improved error messages when using `format!`.][50610]
3771 - [`Iterator::step_by`]
3772 - [`Path::ancestors`]
3773 - [`SystemTime::UNIX_EPOCH`]
3774 - [`alloc::GlobalAlloc`]
3776 - [`alloc::LayoutErr`]
3779 - [`alloc::alloc_zeroed`]
3780 - [`alloc::dealloc`]
3781 - [`alloc::realloc`]
3782 - [`alloc::handle_alloc_error`]
3783 - [`btree_map::Entry::or_default`]
3784 - [`fmt::Alignment`]
3785 - [`hash_map::Entry::or_default`]
3786 - [`iter::repeat_with`]
3787 - [`num::NonZeroUsize`]
3788 - [`num::NonZeroU128`]
3789 - [`num::NonZeroU16`]
3790 - [`num::NonZeroU32`]
3791 - [`num::NonZeroU64`]
3792 - [`num::NonZeroU8`]
3793 - [`ops::RangeBounds`]
3794 - [`slice::SliceIndex`]
3795 - [`slice::from_mut`]
3796 - [`slice::from_ref`]
3797 - [`{Any + Send + Sync}::downcast_mut`]
3798 - [`{Any + Send + Sync}::downcast_ref`]
3799 - [`{Any + Send + Sync}::is`]
3803 - [Cargo will now no longer allow you to publish crates with build scripts that
3804 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3805 considered to be immutable.
3809 - [The `suggestion_applicability` field in `rustc`'s json output is now
3810 stable.][50486] This will allow dev tools to check whether a code suggestion
3811 would apply to them.
3815 - [Rust will consider trait objects with duplicated constraints to be the same
3816 type as without the duplicated constraint.][51276] For example the below code will
3817 now fail to compile.
3822 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3825 impl Trait + Send + Send {
3826 fn test(&self) { println!("two"); }
3830 [49546]: https://github.com/rust-lang/rust/pull/49546/
3831 [50143]: https://github.com/rust-lang/rust/pull/50143/
3832 [50170]: https://github.com/rust-lang/rust/pull/50170/
3833 [50234]: https://github.com/rust-lang/rust/pull/50234/
3834 [50265]: https://github.com/rust-lang/rust/pull/50265/
3835 [50364]: https://github.com/rust-lang/rust/pull/50364/
3836 [50385]: https://github.com/rust-lang/rust/pull/50385/
3837 [50465]: https://github.com/rust-lang/rust/pull/50465/
3838 [50486]: https://github.com/rust-lang/rust/pull/50486/
3839 [50554]: https://github.com/rust-lang/rust/pull/50554/
3840 [50610]: https://github.com/rust-lang/rust/pull/50610/
3841 [50855]: https://github.com/rust-lang/rust/pull/50855/
3842 [51050]: https://github.com/rust-lang/rust/pull/51050/
3843 [51196]: https://github.com/rust-lang/rust/pull/51196/
3844 [51200]: https://github.com/rust-lang/rust/pull/51200/
3845 [51241]: https://github.com/rust-lang/rust/pull/51241/
3846 [51276]: https://github.com/rust-lang/rust/pull/51276/
3847 [51298]: https://github.com/rust-lang/rust/pull/51298/
3848 [51306]: https://github.com/rust-lang/rust/pull/51306/
3849 [51562]: https://github.com/rust-lang/rust/pull/51562/
3850 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3851 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3852 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3853 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3854 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3855 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3856 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3857 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3858 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3859 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3860 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3861 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3862 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3863 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3864 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3865 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3866 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3867 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3868 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3869 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3870 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3871 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3872 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3873 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3874 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3875 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3876 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3877 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3878 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3879 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3881 Version 1.27.2 (2018-07-20)
3882 ===========================
3887 - The borrow checker was fixed to avoid potential unsoundness when using
3888 match ergonomics: [#52213][52213].
3890 [52213]: https://github.com/rust-lang/rust/issues/52213
3892 Version 1.27.1 (2018-07-10)
3893 ===========================
3898 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3899 when running, which enabled executing code as some other user on a
3900 given machine. This release fixes that vulnerability; you can read
3901 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3903 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3908 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3909 match ergonomics: [#51415][51415], [#49534][49534].
3911 [51415]: https://github.com/rust-lang/rust/issues/51415
3912 [49534]: https://github.com/rust-lang/rust/issues/49534
3913 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3914 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3916 Version 1.27.0 (2018-06-21)
3917 ==========================
3921 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3922 be used as an identifier.
3923 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3924 bare `Trait` syntax, and should make it clearer when being used in tandem with
3925 `impl Trait` because it is equivalent to the following syntax:
3926 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3927 `Box<Trait> == Box<dyn Trait>`.
3928 - [Attributes on generic parameters such as types and lifetimes are
3929 now stable.][48851] e.g.
3930 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3931 - [The `#[must_use]` attribute can now also be used on functions as well as
3932 types.][48925] It provides a lint that by default warns users when the
3933 value returned by a function has not been used.
3937 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3941 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3942 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3943 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3944 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3945 the `cfg` attribute.
3946 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3947 std are now available in core.][49896]
3948 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3950 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3951 that the operation isn't done in place.
3952 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3953 the `#[must_use]` attribute][49533] to warn about unused potentially
3954 expensive allocations.
3958 - [`DoubleEndedIterator::rfind`]
3959 - [`DoubleEndedIterator::rfold`]
3960 - [`DoubleEndedIterator::try_rfold`]
3961 - [`Duration::from_micros`]
3962 - [`Duration::from_nanos`]
3963 - [`Duration::subsec_micros`]
3964 - [`Duration::subsec_millis`]
3965 - [`HashMap::remove_entry`]
3966 - [`Iterator::try_fold`]
3967 - [`Iterator::try_for_each`]
3969 - [`Option::filter`]
3970 - [`String::replace_range`]
3971 - [`Take::set_limit`]
3972 - [`hint::unreachable_unchecked`]
3973 - [`os::unix::process::parent_id`]
3974 - [`ptr::swap_nonoverlapping`]
3975 - [`slice::rsplit_mut`]
3977 - [`slice::swap_with_slice`]
3981 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3982 `readme`, and `repository` fields.][cargo/5386]
3983 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3984 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3985 a different directory than `target` for placing compilation artifacts.
3986 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3987 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3988 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3989 where cargo would infer a binary, Cargo will produce a warning. You can
3990 disable this feature ahead of time by setting any of the following to false:
3991 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3992 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3993 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3997 - [Added “The Rustc book” into the official documentation.][49707]
3998 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3999 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4003 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4004 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4005 compile, `"".is_empty()` will still compile.
4006 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4007 will only print the inner type.][48553] E.g.
4008 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4009 not `AtomicBool(true)`.
4010 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4011 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4012 alignment should cover all use cases.
4013 - The `.description()` method on the `std::error::Error` trait
4014 [has been soft-deprecated][50163]. It is no longer required to implement it.
4016 [48553]: https://github.com/rust-lang/rust/pull/48553/
4017 [48851]: https://github.com/rust-lang/rust/pull/48851/
4018 [48925]: https://github.com/rust-lang/rust/pull/48925/
4019 [49533]: https://github.com/rust-lang/rust/pull/49533/
4020 [49623]: https://github.com/rust-lang/rust/pull/49623/
4021 [49630]: https://github.com/rust-lang/rust/pull/49630/
4022 [49664]: https://github.com/rust-lang/rust/pull/49664/
4023 [49699]: https://github.com/rust-lang/rust/pull/49699/
4024 [49707]: https://github.com/rust-lang/rust/pull/49707/
4025 [49719]: https://github.com/rust-lang/rust/pull/49719/
4026 [49896]: https://github.com/rust-lang/rust/pull/49896/
4027 [49968]: https://github.com/rust-lang/rust/pull/49968/
4028 [50163]: https://github.com/rust-lang/rust/pull/50163
4029 [50177]: https://github.com/rust-lang/rust/pull/50177/
4030 [50378]: https://github.com/rust-lang/rust/pull/50378/
4031 [50398]: https://github.com/rust-lang/rust/pull/50398/
4032 [50423]: https://github.com/rust-lang/rust/pull/50423/
4033 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4034 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4035 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4036 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4037 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4038 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4039 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4040 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4041 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4042 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4043 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4044 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4045 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4046 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4047 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4048 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4049 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4050 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4051 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4052 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4053 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4054 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4055 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4056 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4057 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4058 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4059 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4060 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4061 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4062 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4065 Version 1.26.2 (2018-06-05)
4066 ==========================
4071 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4073 [51117]: https://github.com/rust-lang/rust/issues/51117
4076 Version 1.26.1 (2018-05-29)
4077 ==========================
4082 - [RLS now works on Windows.][50646]
4083 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4089 - [`fn main() -> impl Trait` no longer works for non-Termination
4091 This reverts an accidental stabilization.
4092 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4093 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4095 [50646]: https://github.com/rust-lang/rust/issues/50646
4096 [50656]: https://github.com/rust-lang/rust/pull/50656
4097 [50812]: https://github.com/rust-lang/rust/pull/50812
4098 [50950]: https://github.com/rust-lang/rust/issues/50950
4099 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4101 Version 1.26.0 (2018-05-10)
4102 ==========================
4106 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4107 implement either or both traits.][49299]
4108 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4109 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4110 lifetime can be elided.][49458]
4111 - [`impl Trait` is now stable allowing you to have abstract types in returns
4112 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4113 `fn open(path: impl AsRef<Path>)`.
4114 - [Pattern matching will now automatically apply dereferences.][49394]
4115 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4116 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4117 - [A lot of operations are now available in a const context.][46882] E.g. You
4118 can now index into constant arrays, reference and dereference into constants,
4119 and use tuple struct constructors.
4120 - [Fixed entry slice patterns are now stable.][48516] E.g.
4122 let points = [1, 2, 3, 4];
4124 [1, 2, 3, 4] => println!("All points were sequential."),
4125 _ => println!("Not all points were sequential."),
4132 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4133 - [Fixed exponential projection complexity on nested types.][48296]
4134 This can provide up to a ~12% reduction in compile times for certain crates.
4135 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4136 to remap path prefixes outputted by the compiler.
4137 - [Added `powerpc-unknown-netbsd` target.][48281]
4141 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4142 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4143 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4144 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4145 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4146 - [`ascii::escape_default` is now available in libcore.][48735]
4147 - [Trailing commas are now supported in std and core macros.][48056]
4148 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4149 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4154 - [`*const T::copy_to_nonoverlapping`]
4155 - [`*const T::copy_to`]
4156 - [`*const T::read_unaligned`]
4157 - [`*const T::read_volatile`]
4158 - [`*const T::read`]
4160 - [`*const T::wrapping_add`]
4161 - [`*const T::wrapping_sub`]
4163 - [`*mut T::copy_to_nonoverlapping`]
4164 - [`*mut T::copy_to`]
4165 - [`*mut T::read_unaligned`]
4166 - [`*mut T::read_volatile`]
4168 - [`*mut T::replace`]
4171 - [`*mut T::wrapping_add`]
4172 - [`*mut T::wrapping_sub`]
4173 - [`*mut T::write_bytes`]
4174 - [`*mut T::write_unaligned`]
4175 - [`*mut T::write_volatile`]
4178 - [`FromUtf8Error::as_bytes`]
4179 - [`LocalKey::try_with`]
4180 - [`Option::cloned`]
4181 - [`btree_map::Entry::and_modify`]
4182 - [`fs::read_to_string`]
4185 - [`hash_map::Entry::and_modify`]
4186 - [`iter::FusedIterator`]
4187 - [`ops::RangeInclusive`]
4188 - [`ops::RangeToInclusive`]
4190 - [`slice::rotate_left`]
4191 - [`slice::rotate_right`]
4192 - [`String::retain`]
4197 - [Cargo will now output path to custom commands when `-v` is
4198 passed with `--list`][cargo/5041]
4199 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4203 - [The second edition of "The Rust Programming Language" book is now recommended
4204 over the first.][48404]
4209 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4210 syntax is now invalid.
4212 use std::ops::Fn as dyn;
4213 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4215 - [The result of dereferences are no longer promoted to `'static`.][47408]
4219 const PAIR: &(i32, i32) = &(0, 1);
4220 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4223 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4224 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4226 - [Removed hoedown from rustdoc.][48274]
4227 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4229 [46882]: https://github.com/rust-lang/rust/pull/46882
4230 [47379]: https://github.com/rust-lang/rust/pull/47379
4231 [47408]: https://github.com/rust-lang/rust/pull/47408
4232 [47813]: https://github.com/rust-lang/rust/pull/47813
4233 [48056]: https://github.com/rust-lang/rust/pull/48056
4234 [48125]: https://github.com/rust-lang/rust/pull/48125
4235 [48166]: https://github.com/rust-lang/rust/pull/48166
4236 [48235]: https://github.com/rust-lang/rust/pull/48235
4237 [48274]: https://github.com/rust-lang/rust/pull/48274
4238 [48281]: https://github.com/rust-lang/rust/pull/48281
4239 [48296]: https://github.com/rust-lang/rust/pull/48296
4240 [48326]: https://github.com/rust-lang/rust/pull/48326
4241 [48359]: https://github.com/rust-lang/rust/pull/48359
4242 [48404]: https://github.com/rust-lang/rust/pull/48404
4243 [48481]: https://github.com/rust-lang/rust/pull/48481
4244 [48516]: https://github.com/rust-lang/rust/pull/48516
4245 [48628]: https://github.com/rust-lang/rust/pull/48628
4246 [48629]: https://github.com/rust-lang/rust/pull/48629
4247 [48657]: https://github.com/rust-lang/rust/pull/48657
4248 [48735]: https://github.com/rust-lang/rust/pull/48735
4249 [48978]: https://github.com/rust-lang/rust/pull/48978
4250 [49101]: https://github.com/rust-lang/rust/pull/49101
4251 [49109]: https://github.com/rust-lang/rust/pull/49109
4252 [49121]: https://github.com/rust-lang/rust/pull/49121
4253 [49162]: https://github.com/rust-lang/rust/pull/49162
4254 [49184]: https://github.com/rust-lang/rust/pull/49184
4255 [49234]: https://github.com/rust-lang/rust/pull/49234
4256 [49255]: https://github.com/rust-lang/rust/pull/49255
4257 [49299]: https://github.com/rust-lang/rust/pull/49299
4258 [49305]: https://github.com/rust-lang/rust/pull/49305
4259 [49394]: https://github.com/rust-lang/rust/pull/49394
4260 [49458]: https://github.com/rust-lang/rust/pull/49458
4261 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4262 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4263 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4264 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4265 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4266 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4267 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4268 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4269 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4270 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4271 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4272 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4273 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4274 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4275 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4276 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4277 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4278 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4279 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4280 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4281 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4282 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4283 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4284 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4285 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4286 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4287 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4288 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4289 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4290 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4291 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4292 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4293 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4294 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4295 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4296 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4297 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4298 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4299 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4300 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4301 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4302 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4305 Version 1.25.0 (2018-03-29)
4306 ==========================
4310 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4311 - [You can now use nested groups of imports.][47948]
4312 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4313 - [You can now have `|` at the start of a match arm.][47947] e.g.
4315 enum Foo { A, B, C }
4321 | Foo::B => println!("AB"),
4322 | Foo::C => println!("C"),
4329 - [Upgraded to LLVM 6.][47828]
4330 - [Added `-C lto=val` option.][47521]
4331 - [Added `i586-unknown-linux-musl` target][47282]
4335 - [Impl Send for `process::Command` on Unix.][47760]
4336 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4337 - [`UnsafeCell::into_inner` is now safe.][47204]
4338 - [Implement libstd for CloudABI.][47268]
4339 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4340 - [Implement `AsRef<Path>` for Component][46985]
4341 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4342 - [Moved `Duration` to libcore.][46666]
4346 - [`Location::column`]
4349 The following functions can now be used in a constant expression.
4350 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4351 - [`Duration::new`][47300]
4352 - [`Duration::from_secs`][47300]
4353 - [`Duration::from_millis`][47300]
4357 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4358 - [`cargo new` now defaults to creating a binary crate, instead of a
4359 library crate.][cargo/5029]
4363 - [Rust by example is now shipped with new releases][46196]
4367 - [Deprecated `net::lookup_host`.][47510]
4368 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4369 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4370 around indexing operations (see [#47349][47349]). This has been fixed (which also
4371 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4372 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4374 [33903]: https://github.com/rust-lang/rust/pull/33903
4375 [47947]: https://github.com/rust-lang/rust/pull/47947
4376 [47948]: https://github.com/rust-lang/rust/pull/47948
4377 [47760]: https://github.com/rust-lang/rust/pull/47760
4378 [47790]: https://github.com/rust-lang/rust/pull/47790
4379 [47828]: https://github.com/rust-lang/rust/pull/47828
4380 [47398]: https://github.com/rust-lang/rust/pull/47398
4381 [47510]: https://github.com/rust-lang/rust/pull/47510
4382 [47521]: https://github.com/rust-lang/rust/pull/47521
4383 [47204]: https://github.com/rust-lang/rust/pull/47204
4384 [47251]: https://github.com/rust-lang/rust/pull/47251
4385 [47268]: https://github.com/rust-lang/rust/pull/47268
4386 [47282]: https://github.com/rust-lang/rust/pull/47282
4387 [47300]: https://github.com/rust-lang/rust/pull/47300
4388 [47349]: https://github.com/rust-lang/rust/pull/47349
4389 [46931]: https://github.com/rust-lang/rust/pull/46931
4390 [46985]: https://github.com/rust-lang/rust/pull/46985
4391 [47006]: https://github.com/rust-lang/rust/pull/47006
4392 [46830]: https://github.com/rust-lang/rust/pull/46830
4393 [46095]: https://github.com/rust-lang/rust/pull/46095
4394 [46666]: https://github.com/rust-lang/rust/pull/46666
4395 [46196]: https://github.com/rust-lang/rust/pull/46196
4396 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4397 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4398 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4399 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4400 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4403 Version 1.24.1 (2018-03-01)
4404 ==========================
4406 - [Do not abort when unwinding through FFI][48251]
4407 - [Emit UTF-16 files for linker arguments on Windows][48318]
4408 - [Make the error index generator work again][48308]
4409 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4411 [48251]: https://github.com/rust-lang/rust/issues/48251
4412 [48308]: https://github.com/rust-lang/rust/issues/48308
4413 [48318]: https://github.com/rust-lang/rust/issues/48318
4414 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4417 Version 1.24.0 (2018-02-15)
4418 ==========================
4422 - [External `sysv64` ffi is now available.][46528]
4423 eg. `extern "sysv64" fn foo () {}`
4427 - [rustc now uses 16 codegen units by default for release builds.][46910]
4428 For the fastest builds, utilize `codegen-units=1`.
4429 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4430 - [Add `aarch64-unknown-openbsd` support][46760]
4434 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4435 improvement in performance in the majority of cases.
4436 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4437 with Windows.][46798]
4438 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4439 - [impl `From<bool>` for `AtomicBool`][46293]
4440 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4441 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4442 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4443 - [float::from_bits now just uses transmute.][46012] This provides
4444 some optimisations from LLVM.
4445 - [Copied `AsciiExt` methods onto `char`][46077]
4446 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4447 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4448 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4449 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4453 - [`RefCell::replace`]
4455 - [`atomic::spin_loop_hint`]
4457 The following functions can now be used in a constant expression.
4458 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4460 - [`AtomicBool::new`][46287]
4461 - [`AtomicUsize::new`][46287]
4462 - [`AtomicIsize::new`][46287]
4463 - [`AtomicPtr::new`][46287]
4464 - [`Cell::new`][46287]
4465 - [`{integer}::min_value`][46287]
4466 - [`{integer}::max_value`][46287]
4467 - [`mem::size_of`][46287]
4468 - [`mem::align_of`][46287]
4469 - [`ptr::null`][46287]
4470 - [`ptr::null_mut`][46287]
4471 - [`RefCell::new`][46287]
4472 - [`UnsafeCell::new`][46287]
4476 - [Added a `workspace.default-members` config that
4477 overrides implied `--all` in virtual workspaces.][cargo/4743]
4478 - [Enable incremental by default on development builds.][cargo/4817] Also added
4479 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4480 per-project or global basis respectively.
4487 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4488 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4489 in accordance with IETF RFC 4291 §2.2.
4490 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4491 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4492 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4493 - [Leading zeros in tuple struct members is now an error][47084]
4494 - [`column!()` macro is one-based instead of zero-based][46977]
4495 - [`fmt::Arguments` can no longer be shared across threads][45198]
4496 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4497 - [Cargo sets a different working directory for the compiler][cargo/4788]
4499 [44884]: https://github.com/rust-lang/rust/pull/44884
4500 [45198]: https://github.com/rust-lang/rust/pull/45198
4501 [45506]: https://github.com/rust-lang/rust/pull/45506
4502 [45904]: https://github.com/rust-lang/rust/pull/45904
4503 [45990]: https://github.com/rust-lang/rust/pull/45990
4504 [46012]: https://github.com/rust-lang/rust/pull/46012
4505 [46077]: https://github.com/rust-lang/rust/pull/46077
4506 [46094]: https://github.com/rust-lang/rust/pull/46094
4507 [46284]: https://github.com/rust-lang/rust/pull/46284
4508 [46287]: https://github.com/rust-lang/rust/pull/46287
4509 [46293]: https://github.com/rust-lang/rust/pull/46293
4510 [46528]: https://github.com/rust-lang/rust/pull/46528
4511 [46671]: https://github.com/rust-lang/rust/pull/46671
4512 [46713]: https://github.com/rust-lang/rust/pull/46713
4513 [46735]: https://github.com/rust-lang/rust/pull/46735
4514 [46749]: https://github.com/rust-lang/rust/pull/46749
4515 [46760]: https://github.com/rust-lang/rust/pull/46760
4516 [46798]: https://github.com/rust-lang/rust/pull/46798
4517 [46828]: https://github.com/rust-lang/rust/pull/46828
4518 [46831]: https://github.com/rust-lang/rust/pull/46831
4519 [46833]: https://github.com/rust-lang/rust/pull/46833
4520 [46910]: https://github.com/rust-lang/rust/pull/46910
4521 [46977]: https://github.com/rust-lang/rust/pull/46977
4522 [47018]: https://github.com/rust-lang/rust/pull/47018
4523 [47080]: https://github.com/rust-lang/rust/pull/47080
4524 [47084]: https://github.com/rust-lang/rust/pull/47084
4525 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4526 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4527 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4528 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4529 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4530 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4533 Version 1.23.0 (2018-01-04)
4534 ==========================
4538 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4539 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4540 Which should fix some confusing errors in some operations.
4544 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4545 undefined behavior.][45920]
4546 - [rustc now suggests renaming import if names clash.][45660]
4547 - [Display errors/warnings correctly when there are zero-width or
4548 wide characters.][45711]
4549 - [rustc now avoids unnecessary copies of arguments that are
4550 simple bindings][45380] This should improve memory usage on average by 5-10%.
4551 - [Updated musl used to build musl rustc to 1.1.17][45393]
4555 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4556 - [Implement Hash for raw pointers to unsized types][45483]
4557 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4558 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4559 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4560 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4561 and `<*mut T>::as_mut`][44932]
4562 - [Optimized `Thread::{park, unpark}` implementation][45524]
4563 - [Improved `SliceExt::binary_search` performance.][45333]
4564 - [impl `FromIterator<()>` for `()`][45379]
4565 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4573 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4574 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4575 - [Added unit test checking to `cargo check`][cargo/4592]
4576 - [Cargo now lets you install a specific version
4577 using `cargo install --version`][cargo/4637]
4581 - [Releases now ship with the Cargo book documentation.][45692]
4582 - [rustdoc now prints rendering warnings on every run.][45324]
4586 - [Changes have been made to type equality to make it more correct,
4587 in rare cases this could break some code.][45853] [Tracking issue for
4588 further information][45852]
4589 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4590 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4591 Android 9, the minimum supported version is Android 14.
4592 - [Bumped the minimum LLVM to 3.9][45326]
4594 [44042]: https://github.com/rust-lang/rust/pull/44042
4595 [44932]: https://github.com/rust-lang/rust/pull/44932
4596 [45267]: https://github.com/rust-lang/rust/pull/45267
4597 [45324]: https://github.com/rust-lang/rust/pull/45324
4598 [45326]: https://github.com/rust-lang/rust/pull/45326
4599 [45333]: https://github.com/rust-lang/rust/pull/45333
4600 [45379]: https://github.com/rust-lang/rust/pull/45379
4601 [45380]: https://github.com/rust-lang/rust/pull/45380
4602 [45393]: https://github.com/rust-lang/rust/pull/45393
4603 [45435]: https://github.com/rust-lang/rust/pull/45435
4604 [45483]: https://github.com/rust-lang/rust/pull/45483
4605 [45524]: https://github.com/rust-lang/rust/pull/45524
4606 [45571]: https://github.com/rust-lang/rust/pull/45571
4607 [45580]: https://github.com/rust-lang/rust/pull/45580
4608 [45610]: https://github.com/rust-lang/rust/pull/45610
4609 [45660]: https://github.com/rust-lang/rust/pull/45660
4610 [45692]: https://github.com/rust-lang/rust/pull/45692
4611 [45711]: https://github.com/rust-lang/rust/pull/45711
4612 [45772]: https://github.com/rust-lang/rust/pull/45772
4613 [45852]: https://github.com/rust-lang/rust/issues/45852
4614 [45853]: https://github.com/rust-lang/rust/pull/45853
4615 [45887]: https://github.com/rust-lang/rust/pull/45887
4616 [45920]: https://github.com/rust-lang/rust/pull/45920
4617 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4618 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4619 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4622 Version 1.22.1 (2017-11-22)
4623 ==========================
4625 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4627 [46183]: https://github.com/rust-lang/rust/pull/46183
4629 Version 1.22.0 (2017-11-22)
4630 ==========================
4634 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4635 - [Now accepts underscores in unicode escapes][43716]
4636 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4637 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4641 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4642 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4643 This should decrease compile times for debug builds.
4644 - [strict memory alignment now enabled on ARMv6][45094]
4645 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4649 - [Allow atomic operations up to 32 bits
4650 on `armv5te_unknown_linux_gnueabi`][44978]
4651 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4652 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4653 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4654 - [Properly detect overflow in `Instant += Duration`.][44220]
4655 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4656 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4657 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4664 - [Cargo will now build multi file examples in subdirectories of the `examples`
4665 folder that have a `main.rs` file.][cargo/4496]
4666 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4667 the old format will continue to work and can be updated with `cargo update`.
4668 - [Now supports vendoring git repositories][cargo/3992]
4672 - [`libbacktrace` is now available on Apple platforms.][44251]
4673 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4674 This now lets you specify that a given code example will fail to compile.
4678 - [The minimum Android version that rustc can build for has been bumped
4679 to `4.0` from `2.3`][45656]
4680 - [Allowing `T op= &T` for numeric types has broken some type
4681 inference cases][45480]
4684 [42526]: https://github.com/rust-lang/rust/pull/42526
4685 [43017]: https://github.com/rust-lang/rust/pull/43017
4686 [43716]: https://github.com/rust-lang/rust/pull/43716
4687 [43949]: https://github.com/rust-lang/rust/pull/43949
4688 [44015]: https://github.com/rust-lang/rust/pull/44015
4689 [44220]: https://github.com/rust-lang/rust/pull/44220
4690 [44251]: https://github.com/rust-lang/rust/pull/44251
4691 [44287]: https://github.com/rust-lang/rust/pull/44287
4692 [44303]: https://github.com/rust-lang/rust/pull/44303
4693 [44456]: https://github.com/rust-lang/rust/pull/44456
4694 [44466]: https://github.com/rust-lang/rust/pull/44466
4695 [44895]: https://github.com/rust-lang/rust/pull/44895
4696 [44966]: https://github.com/rust-lang/rust/pull/44966
4697 [44978]: https://github.com/rust-lang/rust/pull/44978
4698 [45041]: https://github.com/rust-lang/rust/pull/45041
4699 [45064]: https://github.com/rust-lang/rust/pull/45064
4700 [45075]: https://github.com/rust-lang/rust/pull/45075
4701 [45094]: https://github.com/rust-lang/rust/pull/45094
4702 [45095]: https://github.com/rust-lang/rust/pull/45095
4703 [45480]: https://github.com/rust-lang/rust/issues/45480
4704 [45656]: https://github.com/rust-lang/rust/pull/45656
4705 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4706 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4707 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4714 Version 1.21.0 (2017-10-12)
4715 ==========================
4719 - [You can now use static references for literals.][43838]
4723 let x: &'static u32 = &0;
4726 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4729 my_macro!(Vec<i32>::new); // Always worked
4730 my_macro!(Vec::<i32>::new); // Now works
4735 - [Upgraded jemalloc to 4.5.0][43911]
4736 - [Enabled unwinding panics on Redox][43917]
4737 - [Now runs LLVM in parallel during translation phase.][43506]
4738 This should reduce peak memory usage.
4742 - [Generate builtin impls for `Clone` for all arrays and tuples that
4743 are `T: Clone`][43690]
4744 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4745 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4746 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4751 [`std::mem::discriminant`]
4755 - [You can now call `cargo install` with multiple package names][cargo/4216]
4756 - [Cargo commands inside a virtual workspace will now implicitly
4757 pass `--all`][cargo/4335]
4758 - [Added a `[patch]` section to `Cargo.toml` to handle
4759 prepublication dependencies][cargo/4123] [RFC 1969]
4760 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4761 like patterns][cargo/4270]
4762 - [Added the `--all-targets` option][cargo/4400]
4763 - [Using required dependencies as a feature is now deprecated and emits
4764 a warning][cargo/4364]
4769 - [Cargo docs are moving][43916]
4770 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4771 - [The rustdoc book is now available][43863]
4772 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4773 - [Added a preview of RLS has been made available through rustup][44204]
4774 Install with `rustup component add rls-preview`
4775 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4776 Previously only showed `std::os::unix`.
4780 - [Changes in method matching against higher-ranked types][43880] This may cause
4781 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4782 - [rustc's JSON error output's byte position start at top of file.][42973]
4783 Was previously relative to the rustc's internal `CodeMap` struct which
4784 required the unstable library `libsyntax` to correctly use.
4785 - [`unused_results` lint no longer ignores booleans][43728]
4787 [42565]: https://github.com/rust-lang/rust/pull/42565
4788 [42973]: https://github.com/rust-lang/rust/pull/42973
4789 [43348]: https://github.com/rust-lang/rust/pull/43348
4790 [43459]: https://github.com/rust-lang/rust/pull/43459
4791 [43506]: https://github.com/rust-lang/rust/pull/43506
4792 [43540]: https://github.com/rust-lang/rust/pull/43540
4793 [43690]: https://github.com/rust-lang/rust/pull/43690
4794 [43728]: https://github.com/rust-lang/rust/pull/43728
4795 [43838]: https://github.com/rust-lang/rust/pull/43838
4796 [43863]: https://github.com/rust-lang/rust/pull/43863
4797 [43880]: https://github.com/rust-lang/rust/pull/43880
4798 [43911]: https://github.com/rust-lang/rust/pull/43911
4799 [43916]: https://github.com/rust-lang/rust/pull/43916
4800 [43917]: https://github.com/rust-lang/rust/pull/43917
4801 [44204]: https://github.com/rust-lang/rust/pull/44204
4802 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4803 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4804 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4805 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4806 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4807 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4808 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4809 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4810 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4812 Version 1.20.0 (2017-08-31)
4813 ===========================
4817 - [Associated constants are now stabilised.][42809]
4818 - [A lot of macro bugs are now fixed.][42913]
4823 - [Struct fields are now properly coerced to the expected field type.][42807]
4824 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4825 `wasm32-experimental-emscripten` target.
4826 - [Changed some of the error messages to be more helpful.][42033]
4827 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4829 - [rustc now reports the total number of errors on compilation failure][43015]
4830 previously this was only the number of errors in the pass that failed.
4831 - [Expansion in rustc has been sped up 29x.][42533]
4832 - [added `msp430-none-elf` target.][43099]
4833 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4835 - [Fixes backtraces on Redox][43228]
4836 - [rustc now identifies different versions of same crate when absolute paths of
4837 different types match in an error message.][42826]
4843 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4844 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4846 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4847 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4848 - [Impl `Clone` for `DefaultHasher`.][42799]
4849 - [Impl `Sync` for `SyncSender`.][42397]
4850 - [Impl `FromStr` for `char`][42271]
4851 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4853 - [allow messages in the `unimplemented!()` macro.][42155]
4854 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4855 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4856 - [Upgrade to Unicode 10.0.0][42999]
4857 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4858 - [Skip the main thread's manual stack guard on Linux][43072]
4859 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4860 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4862 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4867 - [`CStr::into_c_string`]
4868 - [`CString::as_c_str`]
4869 - [`CString::into_boxed_c_str`]
4870 - [`Chain::get_mut`]
4871 - [`Chain::get_ref`]
4872 - [`Chain::into_inner`]
4873 - [`Option::get_or_insert_with`]
4874 - [`Option::get_or_insert`]
4875 - [`OsStr::into_os_string`]
4876 - [`OsString::into_boxed_os_str`]
4879 - [`Utf8Error::error_len`]
4880 - [`char::EscapeDebug`]
4881 - [`char::escape_debug`]
4882 - [`compile_error!`]
4883 - [`f32::from_bits`]
4885 - [`f64::from_bits`]
4887 - [`mem::ManuallyDrop`]
4888 - [`slice::sort_unstable_by_key`]
4889 - [`slice::sort_unstable_by`]
4890 - [`slice::sort_unstable`]
4891 - [`str::from_boxed_utf8_unchecked`]
4892 - [`str::as_bytes_mut`]
4893 - [`str::as_bytes_mut`]
4894 - [`str::from_utf8_mut`]
4895 - [`str::from_utf8_unchecked_mut`]
4897 - [`str::get_unchecked_mut`]
4898 - [`str::get_unchecked`]
4900 - [`str::into_boxed_bytes`]
4905 - [Cargo API token location moved from `~/.cargo/config` to
4906 `~/.cargo/credentials`.][cargo/3978]
4907 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4908 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4909 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4910 - [You can now specify version of a binary when installed through
4911 `cargo install` using `--vers`.][cargo/4229]
4912 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4913 failure.][cargo/4248]
4914 - [Changed the convention around which file is the crate root.][cargo/4259]
4915 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4916 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4921 - [Functions with `'static` in their return types will now not be as usable as
4922 if they were using lifetime parameters instead.][42417]
4923 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4924 takes the sign of NaN into account where previously didn't.][42430]
4926 [42033]: https://github.com/rust-lang/rust/pull/42033
4927 [42155]: https://github.com/rust-lang/rust/pull/42155
4928 [42271]: https://github.com/rust-lang/rust/pull/42271
4929 [42397]: https://github.com/rust-lang/rust/pull/42397
4930 [42417]: https://github.com/rust-lang/rust/pull/42417
4931 [42430]: https://github.com/rust-lang/rust/pull/42430
4932 [42431]: https://github.com/rust-lang/rust/pull/42431
4933 [42533]: https://github.com/rust-lang/rust/pull/42533
4934 [42571]: https://github.com/rust-lang/rust/pull/42571
4935 [42613]: https://github.com/rust-lang/rust/pull/42613
4936 [42799]: https://github.com/rust-lang/rust/pull/42799
4937 [42807]: https://github.com/rust-lang/rust/pull/42807
4938 [42809]: https://github.com/rust-lang/rust/pull/42809
4939 [42822]: https://github.com/rust-lang/rust/pull/42822
4940 [42826]: https://github.com/rust-lang/rust/pull/42826
4941 [42854]: https://github.com/rust-lang/rust/pull/42854
4942 [42913]: https://github.com/rust-lang/rust/pull/42913
4943 [42999]: https://github.com/rust-lang/rust/pull/42999
4944 [43011]: https://github.com/rust-lang/rust/pull/43011
4945 [43015]: https://github.com/rust-lang/rust/pull/43015
4946 [43072]: https://github.com/rust-lang/rust/pull/43072
4947 [43077]: https://github.com/rust-lang/rust/pull/43077
4948 [43097]: https://github.com/rust-lang/rust/pull/43097
4949 [43099]: https://github.com/rust-lang/rust/pull/43099
4950 [43170]: https://github.com/rust-lang/rust/pull/43170
4951 [43178]: https://github.com/rust-lang/rust/pull/43178
4952 [43185]: https://github.com/rust-lang/rust/pull/43185
4953 [43228]: https://github.com/rust-lang/rust/pull/43228
4954 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4955 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4956 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4957 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4958 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4959 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4960 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4961 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4962 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4963 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4964 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4965 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4966 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4967 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4968 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4969 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4970 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4971 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4972 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4973 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4974 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4975 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4976 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4977 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4978 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4979 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4980 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4981 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4982 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4983 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4984 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4985 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4986 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4987 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4988 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4989 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4990 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4991 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4992 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4995 Version 1.19.0 (2017-07-20)
4996 ===========================
5001 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5002 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5003 - [Macro recursion limit increased to 1024 from 64.][41676]
5004 - [Added lint for detecting unused macros.][41907]
5005 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5006 For example: `let x = loop { break 7; };`
5007 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5008 contain `Copy` types and cannot have a `Drop` implementation.
5009 Example: `union Foo { bar: u8, baz: usize }`
5010 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5011 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5016 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5017 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5018 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5019 you should use `--target armv7-linux-androideabi`.
5020 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5021 - [Minor optimisation of string operations.][42037]
5022 - [Compiler error message is now `aborting due to previous error(s)` instead of
5023 `aborting due to N previous errors`][42150] This was previously inaccurate and
5024 would only count certain kinds of errors.
5025 - [The compiler now supports Visual Studio 2017][42225]
5026 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5027 - [Added a lot][42264] of [new error codes][42302]
5028 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5029 libraries with C Run-time Libraries(CRT) to be statically linked.
5030 - [Fixed various ARM codegen bugs][42740]
5035 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5036 `Extend<Cow<'a, str>>`][41449]
5037 - [`Vec` now implements `From<&mut [T]>`][41530]
5038 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5039 - [`SplitWhitespace` now implements `Clone`][41659]
5040 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5042 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5043 macros, but for printing to stderr.
5048 - [`OsString::shrink_to_fit`]
5051 - [`thread::ThreadId`]
5056 - [Build scripts can now add environment variables to the environment
5057 the crate is being compiled in.
5058 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5059 - [Subcommands now replace the current process rather than spawning a new
5060 child process][cargo/3970]
5061 - [Workspace members can now accept glob file patterns][cargo/3979]
5062 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5063 the members in a given workspace.][cargo/3988]
5064 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5065 - [Target directory path is now in the cargo metadata][cargo/4022]
5066 - [Cargo no longer checks out a local working directory for the
5067 crates.io index][cargo/4026] This should provide smaller file size for the
5068 registry, and improve cloning times, especially on Windows machines.
5069 - [Added an `--exclude` option for excluding certain packages when using the
5070 `--all` option][cargo/4031]
5071 - [Cargo will now automatically retry when receiving a 5xx error
5072 from crates.io][cargo/4032]
5073 - [The `--features` option now accepts multiple comma or space
5074 delimited values.][cargo/4084]
5075 - [Added support for custom target specific runners][cargo/3954]
5080 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5082 - [Rust will now release XZ compressed packages][rust-installer/57]
5083 - [rustup will now prefer to download rust packages with
5084 XZ compression][rustup/1100] over GZip packages.
5085 - [Added the ability to escape `#` in rust documentation][41785] By adding
5086 additional `#`'s ie. `##` is now `#`
5091 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5092 - [`-Z` flags are now no longer allowed to be used on the stable
5093 compiler.][41751] This has been a warning for a year previous to this.
5094 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5095 longer works][42844]. Users should migrate to the built-in `check`
5096 command, which has been available since 1.16.
5097 - [Ending a float literal with `._` is now a hard error.
5098 Example: `42._` .][41946]
5099 - [Any use of a private `extern crate` outside of its module is now a
5100 hard error.][36886] This was previously a warning.
5101 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5102 relative while the `::` prefix makes a path absolute, but was ignored and the
5103 path was relative regardless.
5104 - [Floating point constants in match patterns is now a hard error][36890]
5105 This was previously a warning.
5106 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5107 match patterns is now a hard error][36891] This was previously a warning.
5108 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5110 - [From the pound escape, lines consisting of multiple `#`s are
5112 - [It is an error to re-export private enum variants][42460]. This is
5113 known to break a number of crates that depend on an older version of
5115 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5116 to use it to find the linker, and the build will fail where it did
5117 not previously][42607]
5119 [36886]: https://github.com/rust-lang/rust/issues/36886
5120 [36888]: https://github.com/rust-lang/rust/issues/36888
5121 [36890]: https://github.com/rust-lang/rust/issues/36890
5122 [36891]: https://github.com/rust-lang/rust/issues/36891
5123 [36892]: https://github.com/rust-lang/rust/issues/36892
5124 [37406]: https://github.com/rust-lang/rust/issues/37406
5125 [39983]: https://github.com/rust-lang/rust/pull/39983
5126 [41145]: https://github.com/rust-lang/rust/pull/41145
5127 [41192]: https://github.com/rust-lang/rust/pull/41192
5128 [41258]: https://github.com/rust-lang/rust/pull/41258
5129 [41370]: https://github.com/rust-lang/rust/pull/41370
5130 [41449]: https://github.com/rust-lang/rust/pull/41449
5131 [41530]: https://github.com/rust-lang/rust/pull/41530
5132 [41624]: https://github.com/rust-lang/rust/pull/41624
5133 [41656]: https://github.com/rust-lang/rust/pull/41656
5134 [41659]: https://github.com/rust-lang/rust/pull/41659
5135 [41676]: https://github.com/rust-lang/rust/pull/41676
5136 [41751]: https://github.com/rust-lang/rust/pull/41751
5137 [41764]: https://github.com/rust-lang/rust/pull/41764
5138 [41785]: https://github.com/rust-lang/rust/pull/41785
5139 [41873]: https://github.com/rust-lang/rust/pull/41873
5140 [41907]: https://github.com/rust-lang/rust/pull/41907
5141 [41946]: https://github.com/rust-lang/rust/pull/41946
5142 [42016]: https://github.com/rust-lang/rust/pull/42016
5143 [42037]: https://github.com/rust-lang/rust/pull/42037
5144 [42068]: https://github.com/rust-lang/rust/pull/42068
5145 [42150]: https://github.com/rust-lang/rust/pull/42150
5146 [42162]: https://github.com/rust-lang/rust/pull/42162
5147 [42225]: https://github.com/rust-lang/rust/pull/42225
5148 [42264]: https://github.com/rust-lang/rust/pull/42264
5149 [42302]: https://github.com/rust-lang/rust/pull/42302
5150 [42460]: https://github.com/rust-lang/rust/issues/42460
5151 [42607]: https://github.com/rust-lang/rust/issues/42607
5152 [42740]: https://github.com/rust-lang/rust/pull/42740
5153 [42844]: https://github.com/rust-lang/rust/issues/42844
5154 [42948]: https://github.com/rust-lang/rust/pull/42948
5155 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5156 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5157 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5158 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5159 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5160 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5161 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5162 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5163 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5164 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5165 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5166 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5167 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5168 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5169 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5170 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5171 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5172 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5173 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5174 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5175 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5176 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5179 Version 1.18.0 (2017-06-08)
5180 ===========================
5185 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5186 make the item visible to just that module tree. Also accepts the keyword
5187 `crate` to make something public to the whole crate but not users of the
5188 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5189 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5190 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5191 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5192 types like `Write + Send`, trailing `+` are now supported in trait objects,
5193 and better error reporting for trait objects starting with `?Sized`.
5194 - [0e+10 is now a valid floating point literal][40589]
5195 - [Now warns if you bind a lifetime parameter to 'static][40734]
5196 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5197 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5198 representation in some cases.][40377]
5203 - [rustc can now emit mir with `--emit mir`][39891]
5204 - [Improved LLVM IR for trivial functions][40367]
5205 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5206 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5207 opportunities found through profiling
5208 - [Improved backtrace formatting when panicking][38165]
5213 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5214 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5215 iteration or reallocation.
5216 - [Simplified HashMap Bucket interface][40561] provides performance
5217 improvements for iterating and cloning.
5218 - [Specialize Vec::from_elem to use calloc][40409]
5219 - [Fixed Race condition in fs::create_dir_all][39799]
5220 - [No longer caching stdio on Windows][40516]
5221 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5222 2.50%~ faster and in one case now 12.50% faster.
5223 - [Optimized `AtomicBool::fetch_nand`][41143]
5228 - [`Child::try_wait`]
5229 - [`HashMap::retain`]
5230 - [`HashSet::retain`]
5232 - [`TcpStream::peek`]
5233 - [`UdpSocket::peek`]
5234 - [`UdpSocket::peek_from`]
5239 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5240 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5241 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5242 - [Added Android build support][cargo/3885]
5243 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5244 of a certain type, for example `cargo build --bins` will build all
5246 - [Added support for haiku][cargo/3952]
5251 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5252 - [Added rust-windbg script for better debugging on Windows][39983]
5253 - [Rust now uses the official cross compiler for NetBSD][40612]
5254 - [rustdoc now accepts `#` at the start of files][40828]
5255 - [Fixed jemalloc support for musl][41168]
5260 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5261 always placed after the sign if it exists and before the digits. With the `#`
5262 flag the zeroes are placed after the prefix and before the digits.
5263 - [Due to the struct field optimisation][40377], using `transmute` on structs
5264 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5265 always been undefined behavior, but is now more likely to break in practice.
5266 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5267 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5268 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5269 - [Overlapping inherent `impl`s are now a hard error][40728]
5270 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5271 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5272 `out.asm` and `out.ll` instead of only one of the filetypes.
5273 - [ calling a function that returns `Self` will no longer work][41805] when
5274 the size of `Self` cannot be statically determined.
5275 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5276 this has caused a few regressions namely:
5278 - Changed the link order of local static/dynamic libraries (respecting the
5279 order on given rather than having the compiler reorder).
5280 - Changed how MinGW is linked, native code linked to dynamic libraries
5281 may require manually linking to the gcc support library (for the native
5284 [38165]: https://github.com/rust-lang/rust/pull/38165
5285 [39799]: https://github.com/rust-lang/rust/pull/39799
5286 [39891]: https://github.com/rust-lang/rust/pull/39891
5287 [39983]: https://github.com/rust-lang/rust/pull/39983
5288 [40043]: https://github.com/rust-lang/rust/pull/40043
5289 [40241]: https://github.com/rust-lang/rust/pull/40241
5290 [40338]: https://github.com/rust-lang/rust/pull/40338
5291 [40367]: https://github.com/rust-lang/rust/pull/40367
5292 [40377]: https://github.com/rust-lang/rust/pull/40377
5293 [40409]: https://github.com/rust-lang/rust/pull/40409
5294 [40516]: https://github.com/rust-lang/rust/pull/40516
5295 [40556]: https://github.com/rust-lang/rust/pull/40556
5296 [40561]: https://github.com/rust-lang/rust/pull/40561
5297 [40589]: https://github.com/rust-lang/rust/pull/40589
5298 [40612]: https://github.com/rust-lang/rust/pull/40612
5299 [40723]: https://github.com/rust-lang/rust/pull/40723
5300 [40728]: https://github.com/rust-lang/rust/pull/40728
5301 [40731]: https://github.com/rust-lang/rust/pull/40731
5302 [40734]: https://github.com/rust-lang/rust/pull/40734
5303 [40805]: https://github.com/rust-lang/rust/pull/40805
5304 [40807]: https://github.com/rust-lang/rust/pull/40807
5305 [40828]: https://github.com/rust-lang/rust/pull/40828
5306 [40870]: https://github.com/rust-lang/rust/pull/40870
5307 [41085]: https://github.com/rust-lang/rust/pull/41085
5308 [41143]: https://github.com/rust-lang/rust/pull/41143
5309 [41168]: https://github.com/rust-lang/rust/pull/41168
5310 [41270]: https://github.com/rust-lang/rust/issues/41270
5311 [41469]: https://github.com/rust-lang/rust/pull/41469
5312 [41805]: https://github.com/rust-lang/rust/issues/41805
5313 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5314 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5315 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5316 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5317 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5318 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5319 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5320 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5321 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5322 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5323 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5324 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5325 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5326 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5329 Version 1.17.0 (2017-04-27)
5330 ===========================
5335 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5336 * [Fields of structs may be initialized without duplicating the field/variable
5337 names][39761]. [RFC 1682]
5338 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5339 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5340 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5341 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5342 `'b`. Soundness fix.
5343 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5344 * [Static variables may contain references to other statics][40027]
5349 * [Exit quickly on only `--emit dep-info`][40336]
5350 * [Make `-C relocation-model` more correctly determine whether the linker
5351 creates a position-independent executable][40245]
5352 * [Add `-C overflow-checks` to directly control whether integer overflow
5354 * [The rustc type checker now checks items on demand instead of in a single
5355 in-order pass][40008]. This is mostly an internal refactoring in support of
5356 future work, including incremental type checking, but also resolves [RFC
5357 1647], allowing `Self` to appear in `impl` `where` clauses.
5358 * [Optimize vtable loads][39995]
5359 * [Turn off vectorization for Emscripten targets][39990]
5360 * [Provide suggestions for unknown macros imported with `use`][39953]
5361 * [Fix ICEs in path resolution][39939]
5362 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5363 * [Add clearer error message using `&str + &str`][39116]
5374 * [`Ordering::then`]
5375 * [`Ordering::then_with`]
5376 * [`BTreeMap::range`]
5377 * [`BTreeMap::range_mut`]
5378 * [`collections::Bound`]
5379 * [`process::abort`]
5380 * [`ptr::read_unaligned`]
5381 * [`ptr::write_unaligned`]
5382 * [`Result::expect_err`]
5385 * [`Cell::into_inner`]
5391 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5392 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5393 * [`String` implements `FromIterator<&char>`][40028]
5394 * `Box` [implements][40009] a number of new conversions:
5395 `From<Box<str>> for String`,
5396 `From<Box<[T]>> for Vec<T>`,
5397 `From<Box<CStr>> for CString`,
5398 `From<Box<OsStr>> for OsString`,
5399 `From<Box<Path>> for PathBuf`,
5400 `Into<Box<str>> for String`,
5401 `Into<Box<[T]>> for Vec<T>`,
5402 `Into<Box<CStr>> for CString`,
5403 `Into<Box<OsStr>> for OsString`,
5404 `Into<Box<Path>> for PathBuf`,
5405 `Default for Box<str>`,
5406 `Default for Box<CStr>`,
5407 `Default for Box<OsStr>`,
5408 `From<&CStr> for Box<CStr>`,
5409 `From<&OsStr> for Box<OsStr>`,
5410 `From<&Path> for Box<Path>`
5411 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5412 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5413 * [Slightly optimize `slice::sort`][39538]
5414 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5415 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5416 `Box<str>` implements `From<&str>`][39438]
5417 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5418 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5419 * [`format!` estimates the needed capacity before writing a string][39356]
5420 * [Support unprivileged symlink creation in Windows][38921]
5421 * [`PathBuf` implements `Default`][38764]
5422 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5423 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5424 and poor hash functions.
5429 * [Add `cargo check --all`][cargo/3731]
5430 * [Add an option to ignore SSL revocation checking][cargo/3699]
5431 * [Add `cargo run --package`][cargo/3691]
5432 * [Add `required_features`][cargo/3667]
5433 * [Assume `build.rs` is a build script][cargo/3664]
5434 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5439 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5441 * [The "Unstable Book" documents nightly-only features][ubook]
5442 * [Improve the style of the sidebar in rustdoc output][40265]
5443 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5444 * [Fix MSP430 breakage due to `i128`][40257]
5445 * [Preliminary Solaris/SPARCv9 support][39903]
5446 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5447 run without installing the MSVC runtime.
5448 * [`rustdoc --test` includes file names in test names][39788]
5449 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5450 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5451 * [Initial support for `aarch64-unknown-freebsd`][39491]
5452 * [Initial support for `i686-unknown-netbsd`][39426]
5453 * [This release no longer includes the old makefile build system][39431]. Rust
5454 is built with a custom build system, written in Rust, and with Cargo.
5455 * [Add Debug implementations for libcollection structs][39002]
5456 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5457 * [`--test-threads=0` produces an error][38945]
5458 * [`rustup` installs documentation by default][40526]
5459 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5460 WinDbg and Visual Studio to improve the debugging experience.
5465 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5466 workaround, either use MSVC 2015 or run vcvars.bat.
5467 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5468 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5469 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5471 * [`format!` and `Display::to_string` panic if an underlying formatting
5472 implementation returns an error][40117]. Previously the error was silently
5473 ignored. It is incorrect for `write_fmt` to return an error when writing
5475 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5476 crates were marked stable and could be accessed from the stable toolchain.
5477 * [Rust git source no longer includes vendored crates][39728]. Those that need
5478 to build with vendored crates should build from release tarballs.
5479 * [Fix inert attributes from `proc_macro_derives`][39572]
5480 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5481 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5483 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5484 existing code generally ignores the type of dead-code unless a type-hint is
5485 provided; this can cause surprising inference interactions particularly around
5486 defaulting. The new code uniformly ignores the result type of dead-code.
5487 * [Tuple-struct constructors with private fields are no longer visible][38932]
5488 * [Lifetime parameters that do not appear in the arguments are now considered
5489 early-bound][38897], resolving a soundness bug (#[32330]). The
5490 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5492 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5493 * [Make transmuting from fn item types to pointer-sized types a hard
5496 [27787]: https://github.com/rust-lang/rust/issues/27787
5497 [32330]: https://github.com/rust-lang/rust/issues/32330
5498 [34198]: https://github.com/rust-lang/rust/pull/34198
5499 [38161]: https://github.com/rust-lang/rust/pull/38161
5500 [38368]: https://github.com/rust-lang/rust/pull/38368
5501 [38584]: https://github.com/rust-lang/rust/issues/38584
5502 [38661]: https://github.com/rust-lang/rust/pull/38661
5503 [38764]: https://github.com/rust-lang/rust/pull/38764
5504 [38864]: https://github.com/rust-lang/rust/issues/38864
5505 [38897]: https://github.com/rust-lang/rust/pull/38897
5506 [38921]: https://github.com/rust-lang/rust/pull/38921
5507 [38932]: https://github.com/rust-lang/rust/pull/38932
5508 [38945]: https://github.com/rust-lang/rust/pull/38945
5509 [38981]: https://github.com/rust-lang/rust/pull/38981
5510 [39002]: https://github.com/rust-lang/rust/pull/39002
5511 [39116]: https://github.com/rust-lang/rust/pull/39116
5512 [39193]: https://github.com/rust-lang/rust/pull/39193
5513 [39265]: https://github.com/rust-lang/rust/pull/39265
5514 [39356]: https://github.com/rust-lang/rust/pull/39356
5515 [39372]: https://github.com/rust-lang/rust/pull/39372
5516 [39426]: https://github.com/rust-lang/rust/pull/39426
5517 [39431]: https://github.com/rust-lang/rust/pull/39431
5518 [39438]: https://github.com/rust-lang/rust/pull/39438
5519 [39440]: https://github.com/rust-lang/rust/pull/39440
5520 [39485]: https://github.com/rust-lang/rust/pull/39485
5521 [39491]: https://github.com/rust-lang/rust/pull/39491
5522 [39518]: https://github.com/rust-lang/rust/pull/39518
5523 [39538]: https://github.com/rust-lang/rust/pull/39538
5524 [39572]: https://github.com/rust-lang/rust/pull/39572
5525 [39633]: https://github.com/rust-lang/rust/pull/39633
5526 [39642]: https://github.com/rust-lang/rust/pull/39642
5527 [39728]: https://github.com/rust-lang/rust/pull/39728
5528 [39761]: https://github.com/rust-lang/rust/pull/39761
5529 [39788]: https://github.com/rust-lang/rust/pull/39788
5530 [39793]: https://github.com/rust-lang/rust/pull/39793
5531 [39837]: https://github.com/rust-lang/rust/pull/39837
5532 [39843]: https://github.com/rust-lang/rust/pull/39843
5533 [39851]: https://github.com/rust-lang/rust/pull/39851
5534 [39903]: https://github.com/rust-lang/rust/pull/39903
5535 [39939]: https://github.com/rust-lang/rust/pull/39939
5536 [39953]: https://github.com/rust-lang/rust/pull/39953
5537 [39960]: https://github.com/rust-lang/rust/pull/39960
5538 [39990]: https://github.com/rust-lang/rust/pull/39990
5539 [39995]: https://github.com/rust-lang/rust/pull/39995
5540 [40008]: https://github.com/rust-lang/rust/pull/40008
5541 [40009]: https://github.com/rust-lang/rust/pull/40009
5542 [40027]: https://github.com/rust-lang/rust/pull/40027
5543 [40028]: https://github.com/rust-lang/rust/pull/40028
5544 [40037]: https://github.com/rust-lang/rust/pull/40037
5545 [40117]: https://github.com/rust-lang/rust/pull/40117
5546 [40166]: https://github.com/rust-lang/rust/pull/40166
5547 [40245]: https://github.com/rust-lang/rust/pull/40245
5548 [40257]: https://github.com/rust-lang/rust/pull/40257
5549 [40261]: https://github.com/rust-lang/rust/pull/40261
5550 [40265]: https://github.com/rust-lang/rust/pull/40265
5551 [40319]: https://github.com/rust-lang/rust/pull/40319
5552 [40336]: https://github.com/rust-lang/rust/pull/40336
5553 [40526]: https://github.com/rust-lang/rust/pull/40526
5554 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5555 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5556 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5557 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5558 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5559 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5560 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5561 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5562 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5563 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5564 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5565 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5566 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5567 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5568 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5569 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5570 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5571 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5572 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5573 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5574 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5575 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5576 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5577 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5578 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5579 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5580 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5581 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5582 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5583 [mdbook]: https://crates.io/crates/mdbook
5584 [ubook]: https://doc.rust-lang.org/unstable-book/
5587 Version 1.16.0 (2017-03-16)
5588 ===========================
5593 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5594 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5595 match patterns][38069]
5596 * [Clean up semantics of `self` in an import list][38313]
5597 * [`Self` may appear in `impl` headers][38920]
5598 * [`Self` may appear in struct expressions][39282]
5603 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5604 a `.rmeta` file containing only crate metadata][38571]. This can be
5605 used by tools like the Rust Language Service to perform
5606 metadata-only builds.
5607 * [Levenshtein based typo suggestions now work in most places, while
5608 previously they worked only for fields and sometimes for local
5609 variables][38927]. Together with the overhaul of "no
5610 resolution"/"unexpected resolution" errors (#[38154]) they result in
5611 large and systematic improvement in resolution diagnostics.
5612 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5614 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5615 * [`rustc` no longer attempts to provide "consider using an explicit
5616 lifetime" suggestions][37057]. They were inaccurate.
5621 * [`VecDeque::truncate`]
5622 * [`VecDeque::resize`]
5623 * [`String::insert_str`]
5624 * [`Duration::checked_add`]
5625 * [`Duration::checked_sub`]
5626 * [`Duration::checked_div`]
5627 * [`Duration::checked_mul`]
5630 * [`SocketAddr::is_ipv4`]
5631 * [`SocketAddr::is_ipv6`]
5632 * [`IpAddr::is_ipv4`]
5633 * [`IpAddr::is_ipv6`]
5635 * [`Vec::dedup_by_key`]
5636 * [`Result::unwrap_or_default`]
5637 * [`<*const T>::wrapping_offset`]
5638 * [`<*mut T>::wrapping_offset`]
5639 * `CommandExt::creation_flags`
5640 * [`File::set_permissions`]
5641 * [`String::split_off`]
5646 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5647 their argument by `Borrow` parameter][37761]
5648 * [All public types in std implement `Debug`][38006]
5649 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5650 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5651 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5653 * [std: Fix partial writes in `LineWriter`][38062]
5654 * [std: Clamp max read/write sizes on Unix][38062]
5655 * [Use more specific panic message for `&str` slicing errors][38066]
5656 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5657 functionality cannot be achieved in std currently.
5658 * [`writeln!`, like `println!`, now accepts a form with no string
5659 or formatting arguments, to just print a newline][38469]
5660 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5661 * [Reduce the size of static data in `std_unicode::tables`][38781]
5662 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5663 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5665 * [`Duration` implements `Sum`][38712]
5666 * [`String` implements `ToSocketAddrs`][39048]
5671 * [The `cargo check` command does a type check of a project without
5672 building it][cargo/3296]
5673 * [crates.io will display CI badges from Travis and AppVeyor, if
5674 specified in Cargo.toml][cargo/3546]
5675 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5676 * [Compilation profiles accept integer values for `debug`, in addition
5677 to `true` and `false`. These are passed to `rustc` as the value to
5678 `-C debuginfo`][cargo/3534]
5679 * [Implement `cargo --version --verbose`][cargo/3604]
5680 * [All builds now output 'dep-info' build dependencies compatible with
5681 make and ninja][cargo/3557]
5682 * [Build all workspace members with `build --all`][cargo/3511]
5683 * [Document all workspace members with `doc --all`][cargo/3515]
5684 * [Path deps outside workspace are not members][cargo/3443]
5689 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5690 the path to the Rust implementation][38589]
5691 * [The `armv7-linux-androideabi` target no longer enables NEON
5692 extensions, per Google's ABI guide][38413]
5693 * [The stock standard library can be compiled for Redox OS][38401]
5694 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5696 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5698 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5703 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5704 match patterns][38069]
5705 * In this release, references to uninhabited types can not be
5706 pattern-matched. This was accidentally allowed in 1.15.
5707 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5708 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5710 * [Clean up semantics of `self` in an import list][38313]
5711 * Reimplemented lifetime elision. This change was almost entirely compatible
5712 with existing code, but it did close a number of small bugs and loopholes,
5713 as well as being more accepting in some other [cases][41105].
5715 [37057]: https://github.com/rust-lang/rust/pull/37057
5716 [37761]: https://github.com/rust-lang/rust/pull/37761
5717 [38006]: https://github.com/rust-lang/rust/pull/38006
5718 [38051]: https://github.com/rust-lang/rust/pull/38051
5719 [38062]: https://github.com/rust-lang/rust/pull/38062
5720 [38062]: https://github.com/rust-lang/rust/pull/38622
5721 [38066]: https://github.com/rust-lang/rust/pull/38066
5722 [38069]: https://github.com/rust-lang/rust/pull/38069
5723 [38131]: https://github.com/rust-lang/rust/pull/38131
5724 [38154]: https://github.com/rust-lang/rust/pull/38154
5725 [38274]: https://github.com/rust-lang/rust/pull/38274
5726 [38304]: https://github.com/rust-lang/rust/pull/38304
5727 [38313]: https://github.com/rust-lang/rust/pull/38313
5728 [38314]: https://github.com/rust-lang/rust/pull/38314
5729 [38327]: https://github.com/rust-lang/rust/pull/38327
5730 [38401]: https://github.com/rust-lang/rust/pull/38401
5731 [38413]: https://github.com/rust-lang/rust/pull/38413
5732 [38469]: https://github.com/rust-lang/rust/pull/38469
5733 [38559]: https://github.com/rust-lang/rust/pull/38559
5734 [38571]: https://github.com/rust-lang/rust/pull/38571
5735 [38580]: https://github.com/rust-lang/rust/pull/38580
5736 [38589]: https://github.com/rust-lang/rust/pull/38589
5737 [38670]: https://github.com/rust-lang/rust/pull/38670
5738 [38712]: https://github.com/rust-lang/rust/pull/38712
5739 [38726]: https://github.com/rust-lang/rust/pull/38726
5740 [38781]: https://github.com/rust-lang/rust/pull/38781
5741 [38798]: https://github.com/rust-lang/rust/pull/38798
5742 [38909]: https://github.com/rust-lang/rust/pull/38909
5743 [38920]: https://github.com/rust-lang/rust/pull/38920
5744 [38927]: https://github.com/rust-lang/rust/pull/38927
5745 [39048]: https://github.com/rust-lang/rust/pull/39048
5746 [39282]: https://github.com/rust-lang/rust/pull/39282
5747 [39379]: https://github.com/rust-lang/rust/pull/39379
5748 [41105]: https://github.com/rust-lang/rust/issues/41105
5749 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5750 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5751 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5752 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5753 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5754 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5755 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5756 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5757 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5758 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5759 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5760 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5761 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5762 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5763 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5764 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5765 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5766 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5767 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5768 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5769 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5770 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5771 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5772 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5773 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5774 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5775 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5776 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5777 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5778 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5781 Version 1.15.1 (2017-02-09)
5782 ===========================
5784 * [Fix IntoIter::as_mut_slice's signature][39466]
5785 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5787 [39466]: https://github.com/rust-lang/rust/pull/39466
5788 [39523]: https://github.com/rust-lang/rust/pull/39523
5791 Version 1.15.0 (2017-02-02)
5792 ===========================
5797 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5798 stable. This allows popular code-generating crates like Serde and Diesel to
5799 work ergonomically. [RFC 1681].
5800 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5801 with curly braces][36868]. Part of [RFC 1506].
5802 * [A number of minor changes to name resolution have been activated][37127].
5803 They add up to more consistent semantics, allowing for future evolution of
5804 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5805 details of what is different. The breaking changes here have been transitioned
5806 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5807 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5809 * [`?Sized` can be used in `where` clauses][37791]
5810 * [There is now a limit on the size of monomorphized types and it can be
5811 modified with the `#![type_size_limit]` crate attribute, similarly to
5812 the `#![recursion_limit]` attribute][37789]
5817 * [On Windows, the compiler will apply dllimport attributes when linking to
5818 extern functions][37973]. Additional attributes and flags can control which
5819 library kind is linked and its name. [RFC 1717].
5820 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5821 * [The `--test` flag works with procedural macro crates][38107]
5822 * [Fix `extern "aapcs" fn` ABI][37814]
5823 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5824 * [The `format!` expander recognizes incorrect `printf` and shell-style
5825 formatting directives and suggests the correct format][37613].
5826 * [Only report one error for all unused imports in an import list][37456]
5828 Compiler Performance
5829 --------------------
5831 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5832 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5833 * [Don't clone in `UnificationTable::probe`][37848]
5834 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5835 * [Use small vectors in type walker][37760]
5836 * [Macro expansion performance was improved][37701]
5837 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5838 * [Replace FNV with a faster hash function][37229]
5843 * [`std::iter::Iterator::min_by`]
5844 * [`std::iter::Iterator::max_by`]
5845 * [`std::os::*::fs::FileExt`]
5846 * [`std::sync::atomic::Atomic*::get_mut`]
5847 * [`std::sync::atomic::Atomic*::into_inner`]
5848 * [`std::vec::IntoIter::as_slice`]
5849 * [`std::vec::IntoIter::as_mut_slice`]
5850 * [`std::sync::mpsc::Receiver::try_iter`]
5851 * [`std::os::unix::process::CommandExt::before_exec`]
5852 * [`std::rc::Rc::strong_count`]
5853 * [`std::rc::Rc::weak_count`]
5854 * [`std::sync::Arc::strong_count`]
5855 * [`std::sync::Arc::weak_count`]
5856 * [`std::char::encode_utf8`]
5857 * [`std::char::encode_utf16`]
5858 * [`std::cell::Ref::clone`]
5859 * [`std::io::Take::into_inner`]
5864 * [The standard sorting algorithm has been rewritten for dramatic performance
5865 improvements][38192]. It is a hybrid merge sort, drawing influences from
5866 Timsort. Previously it was a naive merge sort.
5867 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5868 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5870 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5871 and `char_indices().last()`][37882]
5872 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5873 * [Chinese characters display correctly in `fmt::Debug`][37855]
5874 * [Derive `Default` for `Duration`][37699]
5875 * [Support creation of anonymous pipes on WinXP/2k][37677]
5876 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5877 * [Don't pass overlapped handles to processes][38835]
5882 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5883 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5884 should instead check the variable at runtime with `std::env`. That the value
5885 was set at build time was a bug, and incorrect when cross-compiling. This
5886 change is known to cause breakage.
5887 * [Add `--all` flag to `cargo test`][cargo/3221]
5888 * [Compile statically against the MSVC CRT][cargo/3363]
5889 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5890 * [Link OpenSSL statically on OSX][cargo/3311]
5891 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5892 * [Test for bad path overrides with summaries][cargo/3336]
5893 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5894 * [Fix retrying crate downloads for network errors][cargo/3348]
5895 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5896 * [Emit more info on --message-format=json][cargo/3319]
5897 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5898 * [Don't ignore errors in workspace manifest][cargo/3409]
5899 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5904 * [Test runners (binaries built with `--test`) now support a `--list` argument
5905 that lists the tests it contains][38185]
5906 * [Test runners now support a `--exact` argument that makes the test filter
5907 match exactly, instead of matching only a substring of the test name][38181]
5908 * [rustdoc supports a `--playground-url` flag][37763]
5909 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5914 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5915 continue to be used in this release by passing `--disable-rustbuild` to the
5916 configure script, but they will be deleted soon. Note that the new build
5917 system uses a different on-disk layout that will likely affect any scripts
5919 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5921 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5922 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5928 * [A number of minor changes to name resolution have been activated][37127].
5929 They add up to more consistent semantics, allowing for future evolution of
5930 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5931 details of what is different. The breaking changes here have been transitioned
5932 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5933 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5934 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5935 should instead check the variable at runtime with `std::env`. That the value
5936 was set at build time was a bug, and incorrect when cross-compiling. This
5937 change is known to cause breakage.
5938 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5939 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5940 1.10 and is now an error by default. It will become a hard error in the near
5942 * [The semantics relating modules to file system directories are changing in
5943 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5944 lint, which is a warning in this release, and will become a hard error in the
5946 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5947 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5948 the underlying iterator][37834]
5950 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5951 [33685]: https://github.com/rust-lang/rust/issues/33685
5952 [36868]: https://github.com/rust-lang/rust/pull/36868
5953 [37127]: https://github.com/rust-lang/rust/pull/37127
5954 [37229]: https://github.com/rust-lang/rust/pull/37229
5955 [37456]: https://github.com/rust-lang/rust/pull/37456
5956 [37527]: https://github.com/rust-lang/rust/pull/37527
5957 [37602]: https://github.com/rust-lang/rust/pull/37602
5958 [37613]: https://github.com/rust-lang/rust/pull/37613
5959 [37615]: https://github.com/rust-lang/rust/pull/37615
5960 [37636]: https://github.com/rust-lang/rust/pull/37636
5961 [37627]: https://github.com/rust-lang/rust/pull/37627
5962 [37642]: https://github.com/rust-lang/rust/pull/37642
5963 [37677]: https://github.com/rust-lang/rust/pull/37677
5964 [37699]: https://github.com/rust-lang/rust/pull/37699
5965 [37701]: https://github.com/rust-lang/rust/pull/37701
5966 [37705]: https://github.com/rust-lang/rust/pull/37705
5967 [37749]: https://github.com/rust-lang/rust/pull/37749
5968 [37760]: https://github.com/rust-lang/rust/pull/37760
5969 [37763]: https://github.com/rust-lang/rust/pull/37763
5970 [37764]: https://github.com/rust-lang/rust/pull/37764
5971 [37789]: https://github.com/rust-lang/rust/pull/37789
5972 [37791]: https://github.com/rust-lang/rust/pull/37791
5973 [37814]: https://github.com/rust-lang/rust/pull/37814
5974 [37817]: https://github.com/rust-lang/rust/pull/37817
5975 [37834]: https://github.com/rust-lang/rust/pull/37834
5976 [37848]: https://github.com/rust-lang/rust/pull/37848
5977 [37855]: https://github.com/rust-lang/rust/pull/37855
5978 [37882]: https://github.com/rust-lang/rust/pull/37882
5979 [37888]: https://github.com/rust-lang/rust/pull/37888
5980 [37973]: https://github.com/rust-lang/rust/pull/37973
5981 [37979]: https://github.com/rust-lang/rust/pull/37979
5982 [38086]: https://github.com/rust-lang/rust/pull/38086
5983 [38107]: https://github.com/rust-lang/rust/pull/38107
5984 [38117]: https://github.com/rust-lang/rust/pull/38117
5985 [38134]: https://github.com/rust-lang/rust/pull/38134
5986 [38146]: https://github.com/rust-lang/rust/pull/38146
5987 [38181]: https://github.com/rust-lang/rust/pull/38181
5988 [38182]: https://github.com/rust-lang/rust/pull/38182
5989 [38185]: https://github.com/rust-lang/rust/pull/38185
5990 [38192]: https://github.com/rust-lang/rust/pull/38192
5991 [38279]: https://github.com/rust-lang/rust/pull/38279
5992 [38835]: https://github.com/rust-lang/rust/pull/38835
5993 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5994 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5995 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5996 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5997 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5998 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5999 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6000 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6001 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6002 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6003 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6004 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6005 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6006 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6007 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6008 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6009 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6010 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6011 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6012 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6013 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6014 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6015 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6016 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6017 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6018 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6019 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6020 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6021 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6022 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6023 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6024 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6025 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6026 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6027 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6028 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6029 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6030 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6033 Version 1.14.0 (2016-12-22)
6034 ===========================
6039 * [`..` matches multiple tuple fields in enum variants, structs
6040 and tuples][36843]. [RFC 1492].
6041 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6042 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6043 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6044 dereferencing][36822]
6049 * [Mark enums with non-zero discriminant as non-zero][37224]
6050 * [Lower-case `static mut` names are linted like other
6051 statics and consts][37162]
6052 * [Fix ICE on some macros in const integer positions
6053 (e.g. `[u8; m!()]`)][36819]
6054 * [Improve error message and snippet for "did you mean `x`"][36798]
6055 * [Add a panic-strategy field to the target specification][36794]
6056 * [Include LLVM version in `--version --verbose`][37200]
6058 Compile-time Optimizations
6059 --------------------------
6061 * [Improve macro expansion performance][37569]
6062 * [Shrink `Expr_::ExprInlineAsm`][37445]
6063 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6064 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6065 * [Avoid more allocations when compiling html5ever][37373]
6066 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6067 * [Avoid some allocations in the macro parser][37318]
6068 * [Use a faster deflate setting][37298]
6069 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6070 during interning of slices][37270]
6071 * [Optimize `write_metadata`][37267]
6072 * [Don't process obligation forest cycles when stalled][37231]
6073 * [Avoid many `CrateConfig` clones][37161]
6074 * [Optimize `Substs::super_fold_with`][37108]
6075 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6076 * [Speed up `plug_leaks`][36917]
6081 * [`println!()`, with no arguments, prints newline][36825].
6082 Previously, an empty string was required to achieve the same.
6083 * [`Wrapping` impls standard binary and unary operators, as well as
6084 the `Sum` and `Product` iterators][37356]
6085 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6087 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6088 `VecDeque` iterators][37315]
6089 * [Improve `SipHasher` performance on small values][37312]
6090 * [Add Iterator trait TrustedLen to enable better FromIterator /
6092 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6093 * [`ReadDir` implements `Debug`][37221]
6094 * [Implement `RefUnwindSafe` for atomic types][37178]
6095 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6096 * [Avoid allocations in `Decoder::read_str`][37064]
6097 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6098 * [Impl `Debug` for raw pointers to unsized data][36880]
6099 * [Don't reuse `HashMap` random seeds][37470]
6100 * [The internal memory layout of `HashMap` is more cache-friendly, for
6101 significant improvements in some operations][36692]
6102 * [`HashMap` uses less memory on 32-bit architectures][36595]
6103 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6108 * [Expose rustc cfg values to build scripts][cargo/3243]
6109 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6110 * [Fix passing --features when testing multiple packages][cargo/3280]
6111 * [Use a single profile set per workspace][cargo/3249]
6112 * [Load `replace` sections from lock files][cargo/3220]
6113 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6118 * [rustup is the recommended Rust installation method][1.14rustup]
6119 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6120 S390x. These are [tier 2] platforms and may have major defects. Follow the
6121 instructions on the website to install, or add the targets to an existing
6122 installation with `rustup target add`. The new target triples are:
6123 - `mips-unknown-linux-gnu`
6124 - `mipsel-unknown-linux-gnu`
6125 - `mips64-unknown-linux-gnuabi64`
6126 - `mips64el-unknown-linux-gnuabi64 `
6127 - `powerpc-unknown-linux-gnu`
6128 - `powerpc64-unknown-linux-gnu`
6129 - `powerpc64le-unknown-linux-gnu`
6130 - `s390x-unknown-linux-gnu `
6131 * This release includes target (std) builds for ARM Linux running MUSL
6132 libc. These are [tier 2] platforms and may have major defects. Add the
6133 following triples to an existing rustup installation with `rustup target add`:
6134 - `arm-unknown-linux-musleabi`
6135 - `arm-unknown-linux-musleabihf`
6136 - `armv7-unknown-linux-musleabihf`
6137 * This release includes [experimental support for WebAssembly][1.14wasm], via
6138 the `wasm32-unknown-emscripten` target. This target is known to have major
6139 defects. Please test, report, and fix.
6140 * rustup no longer installs documentation by default. Run `rustup
6141 component add rust-docs` to install.
6142 * [Fix line stepping in debugger][37310]
6143 * [Enable line number debuginfo in releases][37280]
6148 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6149 * [Add support for Fuchsia OS][37313]
6150 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6155 * [A number of forward-compatibility lints used by the compiler
6156 to gradually introduce language changes have been converted
6157 to deny by default][36894]:
6158 - ["use of inaccessible extern crate erroneously allowed"][36886]
6159 - ["type parameter default erroneously allowed in invalid location"][36887]
6160 - ["detects super or self keywords at the beginning of global path"][36888]
6161 - ["two overlapping inherent impls define an item with the same name
6162 were erroneously allowed"][36889]
6163 - ["floating-point constants cannot be used in patterns"][36890]
6164 - ["constants of struct or enum type can only be used in a pattern if
6165 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6166 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6167 * [Prohibit patterns in trait methods without bodies][37378]
6168 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6169 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6170 * [The `$crate` macro variable is accepted in fewer locations][37213]
6171 * [Impls specifying extra region requirements beyond the trait
6172 they implement are rejected][37167]
6173 * [Enums may not be unsized][37111]. Unsized enums are intended to
6174 work but never have. For now they are forbidden.
6175 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6177 [tier 2]: https://forge.rust-lang.org/platform-support.html
6178 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6179 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6180 [36430]: https://github.com/rust-lang/rust/pull/36430
6181 [36595]: https://github.com/rust-lang/rust/pull/36595
6182 [36595]: https://github.com/rust-lang/rust/pull/36595
6183 [36692]: https://github.com/rust-lang/rust/pull/36692
6184 [36767]: https://github.com/rust-lang/rust/pull/36767
6185 [36794]: https://github.com/rust-lang/rust/pull/36794
6186 [36798]: https://github.com/rust-lang/rust/pull/36798
6187 [36819]: https://github.com/rust-lang/rust/pull/36819
6188 [36822]: https://github.com/rust-lang/rust/pull/36822
6189 [36825]: https://github.com/rust-lang/rust/pull/36825
6190 [36843]: https://github.com/rust-lang/rust/pull/36843
6191 [36880]: https://github.com/rust-lang/rust/pull/36880
6192 [36886]: https://github.com/rust-lang/rust/issues/36886
6193 [36887]: https://github.com/rust-lang/rust/issues/36887
6194 [36888]: https://github.com/rust-lang/rust/issues/36888
6195 [36889]: https://github.com/rust-lang/rust/issues/36889
6196 [36890]: https://github.com/rust-lang/rust/issues/36890
6197 [36891]: https://github.com/rust-lang/rust/issues/36891
6198 [36892]: https://github.com/rust-lang/rust/issues/36892
6199 [36894]: https://github.com/rust-lang/rust/pull/36894
6200 [36917]: https://github.com/rust-lang/rust/pull/36917
6201 [36993]: https://github.com/rust-lang/rust/pull/36993
6202 [37037]: https://github.com/rust-lang/rust/pull/37037
6203 [37064]: https://github.com/rust-lang/rust/pull/37064
6204 [37094]: https://github.com/rust-lang/rust/pull/37094
6205 [37108]: https://github.com/rust-lang/rust/pull/37108
6206 [37111]: https://github.com/rust-lang/rust/pull/37111
6207 [37161]: https://github.com/rust-lang/rust/pull/37161
6208 [37162]: https://github.com/rust-lang/rust/pull/37162
6209 [37167]: https://github.com/rust-lang/rust/pull/37167
6210 [37178]: https://github.com/rust-lang/rust/pull/37178
6211 [37200]: https://github.com/rust-lang/rust/pull/37200
6212 [37213]: https://github.com/rust-lang/rust/pull/37213
6213 [37221]: https://github.com/rust-lang/rust/pull/37221
6214 [37224]: https://github.com/rust-lang/rust/pull/37224
6215 [37230]: https://github.com/rust-lang/rust/pull/37230
6216 [37231]: https://github.com/rust-lang/rust/pull/37231
6217 [37247]: https://github.com/rust-lang/rust/pull/37247
6218 [37267]: https://github.com/rust-lang/rust/pull/37267
6219 [37270]: https://github.com/rust-lang/rust/pull/37270
6220 [37273]: https://github.com/rust-lang/rust/pull/37273
6221 [37280]: https://github.com/rust-lang/rust/pull/37280
6222 [37298]: https://github.com/rust-lang/rust/pull/37298
6223 [37306]: https://github.com/rust-lang/rust/pull/37306
6224 [37310]: https://github.com/rust-lang/rust/pull/37310
6225 [37312]: https://github.com/rust-lang/rust/pull/37312
6226 [37313]: https://github.com/rust-lang/rust/pull/37313
6227 [37315]: https://github.com/rust-lang/rust/pull/37315
6228 [37318]: https://github.com/rust-lang/rust/pull/37318
6229 [37322]: https://github.com/rust-lang/rust/pull/37322
6230 [37326]: https://github.com/rust-lang/rust/pull/37326
6231 [37351]: https://github.com/rust-lang/rust/pull/37351
6232 [37356]: https://github.com/rust-lang/rust/pull/37356
6233 [37367]: https://github.com/rust-lang/rust/pull/37367
6234 [37373]: https://github.com/rust-lang/rust/pull/37373
6235 [37378]: https://github.com/rust-lang/rust/pull/37378
6236 [37389]: https://github.com/rust-lang/rust/pull/37389
6237 [37392]: https://github.com/rust-lang/rust/pull/37392
6238 [37427]: https://github.com/rust-lang/rust/pull/37427
6239 [37439]: https://github.com/rust-lang/rust/pull/37439
6240 [37445]: https://github.com/rust-lang/rust/pull/37445
6241 [37470]: https://github.com/rust-lang/rust/pull/37470
6242 [37569]: https://github.com/rust-lang/rust/pull/37569
6243 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6244 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6245 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6246 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6247 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6248 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6249 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6252 Version 1.13.0 (2016-11-10)
6253 ===========================
6258 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6259 errors, like the `try!` macro, described in [RFC 0243].
6260 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6261 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6262 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6263 * [Fix lifetime rules for 'if' conditions][36029]
6264 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6269 * [Add the `-C link-arg` argument][36574]
6270 * [Remove the old AST-based backend from rustc_trans][35764]
6271 * [Don't enable NEON by default on armv7 Linux][35814]
6272 * [Fix debug line number info for macro expansions][35238]
6273 * [Do not emit "class method" debuginfo for types that are not
6274 DICompositeType][36008]
6275 * [Warn about multiple conflicting #[repr] hints][34623]
6276 * [When sizing DST, don't double-count nested struct prefixes][36351]
6277 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6278 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6279 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6280 * [Expand macros without recursing to avoid stack overflows][36214]
6285 * [Replace macro backtraces with labeled local uses][35702]
6286 * [Improve error message for misplaced doc comments][33922]
6287 * [Buffer unix and lock windows to prevent message interleaving][35975]
6288 * [Update lifetime errors to specifically note temporaries][36171]
6289 * [Special case a few colors for Windows][36178]
6290 * [Suggest `use self` when such an import resolves][36289]
6291 * [Be more specific when type parameter shadows primitive type][36338]
6292 * Many minor improvements
6294 Compile-time Optimizations
6295 --------------------------
6297 * [Compute and cache HIR hashes at beginning][35854]
6298 * [Don't hash types in loan paths][36004]
6299 * [Cache projections in trans][35761]
6300 * [Optimize the parser's last token handling][36527]
6301 * [Only instantiate #[inline] functions in codegen units referencing
6302 them][36524]. This leads to big improvements in cases where crates export
6303 define many inline functions without using them directly.
6304 * [Lazily allocate TypedArena's first chunk][36592]
6305 * [Don't allocate during default HashSet creation][36734]
6312 * [`overflowing_abs`]
6313 * [`RefCell::try_borrow`]
6314 * [`RefCell::try_borrow_mut`]
6319 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6320 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6322 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6323 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6324 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6325 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6326 * [Use arc4rand on FreeBSD][35884]
6327 * [memrchr: Correct aligned offset computation][35969]
6328 * [Improve Demangling of Rust Symbols][36059]
6329 * [Use monotonic time in condition variables][35048]
6330 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6331 * [Implement conversion traits for `char`][35755]
6332 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6333 * [Zero first byte of CString on drop][36264]
6334 * [Inherit overflow checks for sum and product][36372]
6335 * [Add missing Eq implementations][36423]
6336 * [Implement `Debug` for `DirEntry`][36631]
6337 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6339 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6340 * [Implement more traits for `std::io::ErrorKind`][35911]
6341 * [Optimize BinaryHeap bounds checking][36072]
6342 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6343 `extend_with_element`][36355]
6344 * [Fix overflow checking in unsigned pow()][34942]
6349 * This release includes security fixes to both curl and OpenSSL.
6350 * [Fix transitive doctests when panic=abort][cargo/3021]
6351 * [Add --all-features flag to cargo][cargo/3038]
6352 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6353 * [Don't parse the home directory more than once][cargo/3078]
6354 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6355 * [Update OpenSSL to 1.0.2j][cargo/3121]
6356 * [Add license and license_file to cargo metadata output][cargo/3110]
6357 * [Make crates-io registry URL optional in config; ignore all changes to
6358 source.crates-io][cargo/3089]
6359 * [Don't download dependencies from other platforms][cargo/3123]
6360 * [Build transitive dev-dependencies when needed][cargo/3125]
6361 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6362 * [Avoid updating registry when adding existing deps][cargo/3144]
6363 * [Warn about path overrides that won't work][cargo/3136]
6364 * [Use workspaces during `cargo install`][cargo/3146]
6365 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6366 * [Add --message-format flag][cargo/3000]
6367 * [Pass target environment for rustdoc][cargo/3205]
6368 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6369 * [Update curl and curl-sys][cargo/3241]
6370 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6375 * [rustdoc: Add the `--sysroot` argument][36586]
6376 * [rustdoc: Fix a couple of issues with the search results][35655]
6377 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6378 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6379 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6384 * [Remove unmaintained style guide][35124]
6385 * [Add s390x support][36369]
6386 * [Initial work at Haiku OS support][36727]
6387 * [Add mips-uclibc targets][35734]
6388 * [Crate-ify compiler-rt into compiler-builtins][35021]
6389 * [Add rustc version info (git hash + date) to dist tarball][36213]
6390 * Many documentation improvements
6395 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6396 * [Deny (by default) transmuting from fn item types to pointer-sized
6397 types][34923]. Continuing the long transition to zero-sized fn items,
6399 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6401 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6402 * [Fix lifetime rules for 'if' conditions][36029].
6403 * [Inherit overflow checks for sum and product][36372].
6404 * [Forbid user-defined macros named "macro_rules"][36730].
6406 [33922]: https://github.com/rust-lang/rust/pull/33922
6407 [34623]: https://github.com/rust-lang/rust/pull/34623
6408 [34923]: https://github.com/rust-lang/rust/pull/34923
6409 [34942]: https://github.com/rust-lang/rust/pull/34942
6410 [34982]: https://github.com/rust-lang/rust/pull/34982
6411 [35021]: https://github.com/rust-lang/rust/pull/35021
6412 [35048]: https://github.com/rust-lang/rust/pull/35048
6413 [35074]: https://github.com/rust-lang/rust/pull/35074
6414 [35124]: https://github.com/rust-lang/rust/pull/35124
6415 [35234]: https://github.com/rust-lang/rust/pull/35234
6416 [35238]: https://github.com/rust-lang/rust/pull/35238
6417 [35354]: https://github.com/rust-lang/rust/pull/35354
6418 [35559]: https://github.com/rust-lang/rust/pull/35559
6419 [35585]: https://github.com/rust-lang/rust/pull/35585
6420 [35627]: https://github.com/rust-lang/rust/pull/35627
6421 [35655]: https://github.com/rust-lang/rust/pull/35655
6422 [35702]: https://github.com/rust-lang/rust/pull/35702
6423 [35707]: https://github.com/rust-lang/rust/pull/35707
6424 [35728]: https://github.com/rust-lang/rust/pull/35728
6425 [35734]: https://github.com/rust-lang/rust/pull/35734
6426 [35755]: https://github.com/rust-lang/rust/pull/35755
6427 [35761]: https://github.com/rust-lang/rust/pull/35761
6428 [35764]: https://github.com/rust-lang/rust/pull/35764
6429 [35814]: https://github.com/rust-lang/rust/pull/35814
6430 [35854]: https://github.com/rust-lang/rust/pull/35854
6431 [35871]: https://github.com/rust-lang/rust/pull/35871
6432 [35884]: https://github.com/rust-lang/rust/pull/35884
6433 [35911]: https://github.com/rust-lang/rust/pull/35911
6434 [35969]: https://github.com/rust-lang/rust/pull/35969
6435 [35975]: https://github.com/rust-lang/rust/pull/35975
6436 [36004]: https://github.com/rust-lang/rust/pull/36004
6437 [36008]: https://github.com/rust-lang/rust/pull/36008
6438 [36014]: https://github.com/rust-lang/rust/pull/36014
6439 [36029]: https://github.com/rust-lang/rust/pull/36029
6440 [36059]: https://github.com/rust-lang/rust/pull/36059
6441 [36072]: https://github.com/rust-lang/rust/pull/36072
6442 [36101]: https://github.com/rust-lang/rust/pull/36101
6443 [36104]: https://github.com/rust-lang/rust/pull/36104
6444 [36171]: https://github.com/rust-lang/rust/pull/36171
6445 [36173]: https://github.com/rust-lang/rust/pull/36173
6446 [36178]: https://github.com/rust-lang/rust/pull/36178
6447 [36213]: https://github.com/rust-lang/rust/pull/36213
6448 [36214]: https://github.com/rust-lang/rust/pull/36214
6449 [36264]: https://github.com/rust-lang/rust/pull/36264
6450 [36266]: https://github.com/rust-lang/rust/pull/36266
6451 [36289]: https://github.com/rust-lang/rust/pull/36289
6452 [36338]: https://github.com/rust-lang/rust/pull/36338
6453 [36351]: https://github.com/rust-lang/rust/pull/36351
6454 [36355]: https://github.com/rust-lang/rust/pull/36355
6455 [36369]: https://github.com/rust-lang/rust/pull/36369
6456 [36372]: https://github.com/rust-lang/rust/pull/36372
6457 [36423]: https://github.com/rust-lang/rust/pull/36423
6458 [36482]: https://github.com/rust-lang/rust/pull/36482
6459 [36505]: https://github.com/rust-lang/rust/pull/36505
6460 [36524]: https://github.com/rust-lang/rust/pull/36524
6461 [36527]: https://github.com/rust-lang/rust/pull/36527
6462 [36551]: https://github.com/rust-lang/rust/pull/36551
6463 [36574]: https://github.com/rust-lang/rust/pull/36574
6464 [36586]: https://github.com/rust-lang/rust/pull/36586
6465 [36592]: https://github.com/rust-lang/rust/pull/36592
6466 [36631]: https://github.com/rust-lang/rust/pull/36631
6467 [36639]: https://github.com/rust-lang/rust/pull/36639
6468 [36721]: https://github.com/rust-lang/rust/pull/36721
6469 [36727]: https://github.com/rust-lang/rust/pull/36727
6470 [36730]: https://github.com/rust-lang/rust/pull/36730
6471 [36734]: https://github.com/rust-lang/rust/pull/36734
6472 [36754]: https://github.com/rust-lang/rust/pull/36754
6473 [36995]: https://github.com/rust-lang/rust/pull/36995
6474 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6475 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6476 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6477 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6478 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6479 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6480 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6481 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6482 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6483 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6484 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6485 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6486 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6487 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6488 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6489 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6490 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6491 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6492 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6493 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6494 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6495 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6496 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6497 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6498 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6499 [rustup]: https://www.rustup.rs
6500 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6501 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6502 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6503 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6504 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6505 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6506 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6509 Version 1.12.1 (2016-10-20)
6510 ===========================
6515 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6516 * [Confusion with double negation and booleans][36856]
6517 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6518 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6519 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6520 * [Corrupted memory after updated to 1.12][36936]
6521 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6522 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6523 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6525 [36381]: https://github.com/rust-lang/rust/issues/36381
6526 [36856]: https://github.com/rust-lang/rust/issues/36856
6527 [36875]: https://github.com/rust-lang/rust/issues/36875
6528 [36924]: https://github.com/rust-lang/rust/issues/36924
6529 [36926]: https://github.com/rust-lang/rust/issues/36926
6530 [36936]: https://github.com/rust-lang/rust/issues/36936
6531 [37026]: https://github.com/rust-lang/rust/issues/37026
6532 [37112]: https://github.com/rust-lang/rust/issues/37112
6533 [37153]: https://github.com/rust-lang/rust/issues/37153
6536 Version 1.12.0 (2016-09-29)
6537 ===========================
6542 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6543 This translation pass is far simpler than the previous AST->LLVM pass, and
6544 creates opportunities to perform new optimizations directly on the MIR. It
6545 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6546 * [`rustc` presents a new, more readable error format, along with
6547 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6548 Most common editors supporting Rust have been updated to work with it. It was
6549 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6554 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6555 This translation pass is far simpler than the previous AST->LLVM pass, and
6556 creates opportunities to perform new optimizations directly on the MIR. It
6557 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6558 * [Print the Rust target name, not the LLVM target name, with
6559 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6560 * [The computation of `TypeId` is correct in some cases where it was previously
6561 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6562 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6563 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6564 `--print relocation-models`, and `--print code-models` print the available
6565 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6566 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6567 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6568 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6569 These targets produce statically-linked binaries. There are no binary release
6575 * [`rustc` presents a new, more readable error format, along with
6576 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6577 Most common editors supporting Rust have been updated to work with it. It was
6578 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6579 * [In error descriptions, references are now described in plain English,
6580 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6581 * [In error type descriptions, unknown numeric types are named `{integer}` or
6582 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6583 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6588 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6589 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6590 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6591 useful](https://github.com/rust-lang/rust/pull/34908)
6592 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6593 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6594 * [Semicolons are properly required as statement delimiters inside
6595 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6596 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6601 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6602 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6603 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6604 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6605 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6606 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6607 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6608 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6609 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6610 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6611 Both on Unix and Windows.
6612 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6613 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6614 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6615 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6616 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6617 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6618 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6619 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6624 * [The `format!` macro and friends now allow a single argument to be formatted
6625 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6626 * [The lifetime bounds on `[T]::binary_search_by` and
6627 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6628 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6629 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6630 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6631 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6632 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6633 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6634 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6635 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6636 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6637 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6638 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6639 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6640 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6641 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6642 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6643 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6644 * [`mpsc::sync_channel` `Receiver`s return any available message before
6645 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6646 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6647 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6652 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6653 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6654 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6655 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6656 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6657 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6658 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6659 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6660 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6661 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6662 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6663 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6664 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6665 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6666 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6667 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6672 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6673 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6678 * [Test binaries now support a `--test-threads` argument to specify the number
6679 of threads used to run tests, and which acts the same as the
6680 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6681 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6682 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6683 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6684 * [Rust releases now come with source packages that can be installed by rustup
6685 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6686 The resulting source code can be used by tools and IDES, located in the
6687 sysroot under `lib/rustlib/src`.
6692 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6693 * Many minor improvements to the documentation.
6694 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6699 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6700 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6701 * [When formatting strings, if "precision" is specified, the "fill",
6702 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6703 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6706 Version 1.11.0 (2016-08-18)
6707 ===========================
6712 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6713 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6714 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6715 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6720 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6721 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6722 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6723 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6724 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6725 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6726 (in libcore - previously stabilized in libstd)
6727 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6728 (in libcore - previously stabilized in libstd)
6729 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6730 (in libcore - previously stabilized in libstd)
6731 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6732 (in libcore - previously stabilized in libstd)
6733 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6734 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6735 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6736 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6741 * [The `thread_local!` macro supports multiple definitions in a single
6742 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6743 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6744 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6745 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6746 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6747 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6748 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6749 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6754 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6755 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6756 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6757 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6758 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6759 and `-vv` prints warnings for all crates.
6760 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6761 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6762 This provides room for expansion by arbitrary tools.
6763 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6764 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6765 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6766 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6767 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6768 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6769 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6774 * [Caching projections speeds up type check dramatically for some
6775 workloads](https://github.com/rust-lang/rust/pull/33816)
6776 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6777 This hasher is faster, but is believed to provide sufficient
6778 protection from collision attacks.
6779 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6784 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6785 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6786 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6787 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6788 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6793 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6794 * [When emitting debug info, rustc emits frame pointers for closures,
6795 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6796 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6797 * Many more errors have been given error codes and extended
6799 * API documentation continues to be improved, with many new examples
6804 * [rustc no longer hangs when dependencies recursively re-export
6805 submodules](https://github.com/rust-lang/rust/pull/34542)
6806 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6807 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6808 rewritten](https://github.com/rust-lang/rust/pull/33895)
6809 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6810 No targets use this yet, but it works toward AVR support.
6815 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6816 * [The new follow-set rules that place restrictions on `macro_rules!`
6817 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6818 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6819 and has been a warning since 1.10.
6820 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6821 This causes breakage in some corner cases.
6824 Version 1.10.0 (2016-07-07)
6825 ===========================
6830 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6831 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6832 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6833 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6834 * [`panic!` can be converted to a runtime abort with the
6835 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6836 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6837 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6838 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6839 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6840 Note that Cargo does not yet directly support cdylibs.
6845 * `os::windows::fs::OpenOptionsExt::access_mode`
6846 * `os::windows::fs::OpenOptionsExt::share_mode`
6847 * `os::windows::fs::OpenOptionsExt::custom_flags`
6848 * `os::windows::fs::OpenOptionsExt::attributes`
6849 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6850 * `os::unix::fs::OpenOptionsExt::custom_flags`
6851 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6852 * `Default for sync::Weak`
6853 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6854 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6855 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6856 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6857 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6858 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6859 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6860 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6861 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6862 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6863 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6864 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6865 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6866 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6867 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6868 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6869 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6870 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6871 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6872 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6873 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6874 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6875 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6876 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6877 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6878 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6879 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6880 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6881 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6882 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6883 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6884 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6885 * Read/Write/RawFd impls for `UnixStream`
6886 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6887 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6888 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6889 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6890 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6891 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6892 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6893 * RawFd impls for `UnixListener`
6894 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6895 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6896 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6897 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6898 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6899 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6900 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6901 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6902 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6903 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6904 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6905 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6906 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6907 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6908 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6909 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6910 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6911 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6912 * RawFd impls for `UnixDatagram`
6913 * `{BTree,Hash}Map::values_mut`
6914 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6919 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6920 The semantics of this minor method are subtle and probably not what
6922 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6923 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6924 will fall back to `/dev/urandom` temporarily to avoid blocking
6925 during early boot](https://github.com/rust-lang/rust/pull/33086).
6926 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6927 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6928 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6929 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6930 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6931 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6932 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6936 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6937 This controls the runtime behavior of the `panic!` macro
6938 and can be either "unwind" (the default), or "abort".
6939 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6940 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6941 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6942 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6943 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6944 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6945 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6946 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6947 By default they are retried twice, which can be customized with the
6948 `net.retry` value in `.cargo/config`.
6949 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6950 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6951 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6952 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6953 Makes it possible to install multiple crates in parallel.
6954 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6955 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6956 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6957 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6958 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6959 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6964 * [rustc memory usage was reduced by refactoring the context used for
6965 type checking](https://github.com/rust-lang/rust/pull/33425).
6966 * [Speed up creation of `HashMap`s by caching the random keys used
6967 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6968 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6969 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6970 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6971 10x faster than the previous lookup tables.
6972 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6977 * Many incremental improvements to documentation and rustdoc.
6978 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6979 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6980 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6981 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6982 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6983 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6984 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6989 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6990 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6991 * [`std` no longer prints backtraces on platforms where the running
6992 module must be loaded with `env::current_exe`, which can't be relied
6993 on](https://github.com/rust-lang/rust/pull/33554).
6994 * This release includes std binaries for the i586-unknown-linux-gnu,
6995 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6996 i586 target is for old x86 hardware without SSE2, and the armv7
6997 target is for Android running on modern ARM architectures.
6998 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6999 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7000 * [On Unix the runtime aborts by calling `libc::abort` instead of
7001 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7002 * [Rust is now bootstrapped from the previous release of Rust,
7003 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7008 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7009 * [`target_env` for Linux ARM targets is just `gnu`, not
7010 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7011 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7012 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7013 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7014 Affects how macros are parsed.
7015 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7016 * [Feature-gated attributes on macro-generated macro invocations are
7017 now rejected](https://github.com/rust-lang/rust/pull/32791).
7018 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7019 This caused some minor changes to type inference.
7022 Version 1.9.0 (2016-05-26)
7023 ==========================
7028 * The `#[deprecated]` attribute when applied to an API will generate
7029 warnings when used. The warnings may be suppressed with
7030 `#[allow(deprecated)]`. [RFC 1270].
7031 * [`fn` item types are zero sized, and each `fn` names a unique
7032 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7033 `transmute` on a `fn` type will generate a warning for a few cycles,
7034 then will be converted to an error.
7035 * [Field and method resolution understand visibility, so private
7036 fields and methods cannot prevent the proper use of public fields
7037 and methods][1.9fv].
7038 * [The parser considers unicode codepoints in the
7039 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7045 * [`std::panic::catch_unwind`] (renamed from `recover`)
7046 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7047 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7048 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7049 * [`str::is_char_boundary`]
7050 * [`<*const T>::as_ref`]
7051 * [`<*mut T>::as_ref`]
7052 * [`<*mut T>::as_mut`]
7053 * [`AsciiExt::make_ascii_uppercase`]
7054 * [`AsciiExt::make_ascii_lowercase`]
7055 * [`char::decode_utf16`]
7056 * [`char::DecodeUtf16`]
7057 * [`char::DecodeUtf16Error`]
7058 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7059 * [`BTreeSet::take`]
7060 * [`BTreeSet::replace`]
7063 * [`HashSet::replace`]
7065 * [`OsString::with_capacity`]
7066 * [`OsString::clear`]
7067 * [`OsString::capacity`]
7068 * [`OsString::reserve`]
7069 * [`OsString::reserve_exact`]
7070 * [`OsStr::is_empty`]
7072 * [`std::os::unix::thread`]
7075 * [`JoinHandleExt::as_pthread_t`]
7076 * [`JoinHandleExt::into_pthread_t`]
7077 * [`HashSet::hasher`]
7078 * [`HashMap::hasher`]
7079 * [`CommandExt::exec`]
7080 * [`File::try_clone`]
7081 * [`SocketAddr::set_ip`]
7082 * [`SocketAddr::set_port`]
7083 * [`SocketAddrV4::set_ip`]
7084 * [`SocketAddrV4::set_port`]
7085 * [`SocketAddrV6::set_ip`]
7086 * [`SocketAddrV6::set_port`]
7087 * [`SocketAddrV6::set_flowinfo`]
7088 * [`SocketAddrV6::set_scope_id`]
7089 * [`slice::copy_from_slice`]
7090 * [`ptr::read_volatile`]
7091 * [`ptr::write_volatile`]
7092 * [`OpenOptions::create_new`]
7093 * [`TcpStream::set_nodelay`]
7094 * [`TcpStream::nodelay`]
7095 * [`TcpStream::set_ttl`]
7096 * [`TcpStream::ttl`]
7097 * [`TcpStream::set_only_v6`]
7098 * [`TcpStream::only_v6`]
7099 * [`TcpStream::take_error`]
7100 * [`TcpStream::set_nonblocking`]
7101 * [`TcpListener::set_ttl`]
7102 * [`TcpListener::ttl`]
7103 * [`TcpListener::set_only_v6`]
7104 * [`TcpListener::only_v6`]
7105 * [`TcpListener::take_error`]
7106 * [`TcpListener::set_nonblocking`]
7107 * [`UdpSocket::set_broadcast`]
7108 * [`UdpSocket::broadcast`]
7109 * [`UdpSocket::set_multicast_loop_v4`]
7110 * [`UdpSocket::multicast_loop_v4`]
7111 * [`UdpSocket::set_multicast_ttl_v4`]
7112 * [`UdpSocket::multicast_ttl_v4`]
7113 * [`UdpSocket::set_multicast_loop_v6`]
7114 * [`UdpSocket::multicast_loop_v6`]
7115 * [`UdpSocket::set_multicast_ttl_v6`]
7116 * [`UdpSocket::multicast_ttl_v6`]
7117 * [`UdpSocket::set_ttl`]
7118 * [`UdpSocket::ttl`]
7119 * [`UdpSocket::set_only_v6`]
7120 * [`UdpSocket::only_v6`]
7121 * [`UdpSocket::join_multicast_v4`]
7122 * [`UdpSocket::join_multicast_v6`]
7123 * [`UdpSocket::leave_multicast_v4`]
7124 * [`UdpSocket::leave_multicast_v6`]
7125 * [`UdpSocket::take_error`]
7126 * [`UdpSocket::connect`]
7127 * [`UdpSocket::send`]
7128 * [`UdpSocket::recv`]
7129 * [`UdpSocket::set_nonblocking`]
7134 * [`std::sync::Once` is poisoned if its initialization function
7136 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7137 * [Most types implement `fmt::Debug`][1.9db].
7138 * [The default buffer size used by `BufReader` and `BufWriter` was
7139 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7140 used by other languages.
7141 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7142 `Duration` additionally implements `*=` and `/=`][1.9ta].
7143 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7144 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7145 * [`Chain` implements `BufRead`][1.9ch].
7146 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7151 * [Cargo can now run concurrently][1.9cc].
7152 * [Top-level overrides allow specific revisions of crates to be
7153 overridden through the entire crate graph][1.9ct]. This is intended
7154 to make upgrades easier for large projects, by allowing crates to be
7155 forked temporarily until they've been upgraded and republished.
7156 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7157 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7158 on the commandline][1.9cf]. `rustc` arguments can also be specified
7159 in the `build.rustflags` configuration key.
7164 * [The time complexity of comparing variables for equivalence during type
7165 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7166 to major compilation time improvement in some scenarios.
7167 * [`ToString` is specialized for `str`, giving it the same performance
7168 as `to_owned`][1.9ts].
7169 * [Spawning processes with `Command::output` no longer creates extra
7171 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7172 for C-like enums][1.9cl].
7177 * [Passing the `--quiet` flag to a test runner will produce
7178 much-abbreviated output][1.9q].
7179 * The Rust Project now publishes std binaries for the
7180 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7181 `i586-pc-windows-msvc` targets.
7186 * [`std::sync::Once` is poisoned if its initialization function
7188 * [It is illegal to define methods with the same name in overlapping
7189 inherent `impl` blocks][1.9sn].
7190 * [`fn` item types are zero sized, and each `fn` names a unique
7191 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7192 `transmute` on a `fn` type will generate a warning for a few cycles,
7193 then will be converted to an error.
7194 * [Improvements to const evaluation may trigger new errors when integer
7195 literals are out of range][1.9ce].
7198 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7199 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7200 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7201 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7202 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7203 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7204 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7205 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7206 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7207 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7208 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7209 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7210 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7211 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7212 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7213 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7214 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7215 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7216 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7217 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7218 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7219 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7220 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7221 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7222 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7223 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7224 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7225 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7226 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7227 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7228 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7229 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7230 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7231 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7232 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7233 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7234 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7235 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7236 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7237 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7238 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7239 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7240 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7241 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7242 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7243 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7244 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7245 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7246 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7247 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7248 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7249 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7250 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7251 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7252 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7253 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7254 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7255 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7256 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7257 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7258 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7259 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7260 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7261 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7262 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7263 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7264 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7265 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7266 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7267 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7268 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7269 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7270 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7271 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7272 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7273 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7274 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7275 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7276 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7277 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7278 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7279 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7280 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7281 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7282 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7283 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7284 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7285 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7286 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7287 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7288 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7289 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7290 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7291 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7292 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7293 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7294 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7295 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7296 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7297 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7298 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7299 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7300 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7301 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7302 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7303 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7304 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7305 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7306 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7307 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7310 Version 1.8.0 (2016-04-14)
7311 ==========================
7316 * Rust supports overloading of compound assignment statements like
7317 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7318 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7319 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7321 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7322 addition to the non-braced form, `struct Foo;`. [RFC 218].
7328 * [`str::encode_utf16`] (renamed from `utf16_units`)
7329 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7332 * [`ptr::drop_in_place`]
7334 * [`time::SystemTime`]
7336 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7337 * [`Instant::elapsed`]
7338 * [`SystemTime::now`]
7339 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7340 * [`SystemTime::elapsed`]
7341 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7342 * [`SystemTimeError`]
7343 * [`SystemTimeError::duration`]
7344 * Various impls for `SystemTimeError`
7346 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7347 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7348 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7349 * [The `write!` and `writeln!` macros correctly emit errors if any of
7350 their arguments can't be formatted][1.8w].
7351 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7352 * [The Unix-specific `raw` modules, which contain a number of
7353 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7354 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7355 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7356 across platforms was making it difficult to implement `std`
7357 correctly. Those that need these definitions should use the `libc`
7359 * The Unix-specific `MetadataExt` traits, including
7360 `os::unix::fs::MetadataExt`, which expose values such as inode
7361 numbers [no longer return platform-specific types][1.8r], but
7362 instead return widened integers. [RFC 1415].
7363 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7364 * [Atomic loads and stores are not volatile][1.8a].
7365 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7370 * [Inlining hash functions lead to a 3% compile-time improvement in
7371 some workloads][1.8h].
7372 * When using jemalloc, its symbols are [unprefixed so that it
7373 overrides the libc malloc implementation][1.8h]. This means that for
7374 rustc, LLVM is now using jemalloc, which results in a 6%
7375 compile-time improvement on a specific workload.
7376 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7381 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7382 i686-pc-windows-msvc is now considered a tier-1 platform.
7383 * [The `--print targets` flag prints a list of supported targets][1.8t].
7384 * [The `--print cfg` flag prints the `cfg`s defined for the current
7386 * [`rustc` can be built with an new Cargo-based build system, written
7387 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7388 build system. To enable it configure with `configure --rustbuild`.
7389 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7390 variants while also indicating the total number of missing variants
7391 if more than 3][1.8m].
7392 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7393 * The Rust Project now publishes binary releases of the standard
7394 library for a number of tier-2 targets:
7395 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7396 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7397 `x86_64-rumprun-netbsd`. These can be installed with
7398 tools such as [multirust][1.8mr].
7403 * [`cargo init` creates a new Cargo project in the current
7404 directory][1.8ci]. It is otherwise like `cargo new`.
7405 * [Cargo has configuration keys for `-v` and
7406 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7407 `[term]` section of `.cargo/config`.
7408 * [Configuration keys that evaluate to strings or integers can be set
7409 via environment variables][1.8ce]. For example the `build.jobs` key
7410 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7411 precedence over config files.
7412 * [Target-specific dependencies support Rust `cfg` syntax for
7413 describing targets][1.8cfg] so that dependencies for multiple
7414 targets can be specified together. [RFC 1361].
7415 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7416 `RUSTDOC` take precedence over the `build.target-dir`,
7417 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7418 * [The child process tree is killed on Windows when Cargo is
7420 * [The `build.target` configuration value sets the target platform,
7421 like `--target`][1.8ct].
7426 * [Unstable compiler flags have been further restricted][1.8u]. Since
7427 1.0 `-Z` flags have been considered unstable, and other flags that
7428 were considered unstable additionally required passing `-Z
7429 unstable-options` to access. Unlike unstable language and library
7430 features though, these options have been accessible on the stable
7431 release channel. Going forward, *new unstable flags will not be
7432 available on the stable release channel*, and old unstable flags
7433 will warn about their usage. In the future, all unstable flags will
7434 be unavailable on the stable release channel.
7435 * [It is no longer possible to `match` on empty enum variants using
7436 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7437 * The Unix-specific `MetadataExt` traits, including
7438 `os::unix::fs::MetadataExt`, which expose values such as inode
7439 numbers [no longer return platform-specific types][1.8r], but
7440 instead return widened integers. [RFC 1415].
7441 * [Modules sourced from the filesystem cannot appear within arbitrary
7442 blocks, but only within other modules][1.8mf].
7443 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7444 * On Unix, [stack overflow triggers a runtime abort instead of a
7446 * [`Command::spawn` and its equivalents return an error if any of
7447 its command-line arguments contain interior `NUL`s][1.8n].
7448 * [Tuple and unit enum variants from other crates are in the type
7450 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7451 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7452 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7453 instead of `foo.lib`.
7456 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7457 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7458 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7459 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7460 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7461 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7462 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7463 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7464 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7465 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7466 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7467 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7468 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7469 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7470 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7471 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7472 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7473 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7474 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7475 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7476 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7477 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7478 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7479 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7480 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7481 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7482 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7483 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7484 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7485 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7486 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7487 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7488 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7489 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7490 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7491 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7492 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7493 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7494 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7495 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7496 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7497 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7498 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7499 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7500 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7501 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7502 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7503 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7504 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7505 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7506 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7507 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7508 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7509 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7510 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7511 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7512 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7513 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7514 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7515 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7518 Version 1.7.0 (2016-03-03)
7519 ==========================
7526 * [`Path::strip_prefix`] (renamed from relative_from)
7527 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7529 * [`Ipv4Addr::is_loopback`]
7530 * [`Ipv4Addr::is_private`]
7531 * [`Ipv4Addr::is_link_local`]
7532 * [`Ipv4Addr::is_multicast`]
7533 * [`Ipv4Addr::is_broadcast`]
7534 * [`Ipv4Addr::is_documentation`]
7536 * [`Ipv6Addr::is_unspecified`]
7537 * [`Ipv6Addr::is_loopback`]
7538 * [`Ipv6Addr::is_multicast`]
7541 * [`Vec::as_mut_slice`]
7543 * [`String::as_str`]
7544 * [`String::as_mut_str`]
7546 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7548 * `<[T]>::`[`sort_by_key`]
7549 * checked, saturated, and overflowing operations
7550 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7551 * [`i32::saturating_mul`]
7552 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7553 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7554 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7555 * [`u32::saturating_mul`]
7556 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7557 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7558 * and checked, saturated, and overflowing operations for other primitive types
7560 * [`ffi::IntoStringError`]
7561 * [`CString::into_string`]
7562 * [`CString::into_bytes`]
7563 * [`CString::into_bytes_with_nul`]
7564 * `From<CString> for Vec<u8>`
7566 * [`IntoStringError::into_cstring`]
7567 * [`IntoStringError::utf8_error`]
7568 * `Error for IntoStringError`
7570 * [`std::hash::BuildHasher`]
7571 * [`BuildHasher::Hasher`]
7572 * [`BuildHasher::build_hasher`]
7573 * [`std::hash::BuildHasherDefault`]
7574 * [`HashMap::with_hasher`]
7575 * [`HashMap::with_capacity_and_hasher`]
7576 * [`HashSet::with_hasher`]
7577 * [`HashSet::with_capacity_and_hasher`]
7578 * [`std::collections::hash_map::RandomState`]
7579 * [`RandomState::new`]
7580 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7581 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7582 from bytes is faster.
7583 * [The performance of `LineWriter` (and thus `io::stdout`) was
7584 improved by using `memchr` to search for newlines][1.7m].
7585 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7586 `f64` variants were stabilized previously.
7587 * [`BTreeMap` was rewritten to use less memory and improve the performance
7588 of insertion and iteration, the latter by as much as 5x][1.7bm].
7589 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7590 covariant over their contained type][1.7bt].
7591 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7592 over their contained type][1.7ll].
7593 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7595 * [`Any` is implemented for unsized types][1.7a].
7596 * [`Hash` is implemented for `Duration`][1.7h].
7601 * [When running tests with `--test`, rustdoc will pass `--cfg`
7602 arguments to the compiler][1.7dt].
7603 * [The compiler is built with RPATH information by default][1.7rpa].
7604 This means that it will be possible to run `rustc` when installed in
7605 unusual configurations without configuring the dynamic linker search
7607 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7608 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7609 over `LD_LIBRARY_PATH`.
7614 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7615 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7616 * [The `rerun-if-changed` build script directive no longer causes the
7617 build script to incorrectly run twice in certain scenarios][1.7rr].
7622 * Soundness fixes to the interactions between associated types and
7623 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7624 code that violates the new rules. This is a significant change that
7625 is known to break existing code, so it has emitted warnings for the
7626 new error cases since 1.4 to give crate authors time to adapt. The
7627 details of what is changing are subtle; read the RFC for more.
7628 * [Several bugs in the compiler's visibility calculations were
7629 fixed][1.7v]. Since this was found to break significant amounts of
7630 code, the new errors will be emitted as warnings for several release
7631 cycles, under the `private_in_public` lint.
7632 * Defaulted type parameters were accidentally accepted in positions
7633 that were not intended. In this release, [defaulted type parameters
7634 appearing outside of type definitions will generate a
7635 warning][1.7d], which will become an error in future releases.
7636 * [Parsing "." as a float results in an error instead of 0][1.7p].
7637 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7638 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7640 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7641 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7642 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7643 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7644 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7645 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7646 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7647 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7648 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7649 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7650 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7651 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7652 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7653 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7654 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7655 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7656 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7657 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7658 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7659 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7660 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7661 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7662 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7663 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7664 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7665 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7666 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7667 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7668 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7669 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7670 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7671 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7672 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7673 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7674 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7675 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7676 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7677 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7678 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7679 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7680 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7681 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7682 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7683 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7684 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7685 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7686 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7687 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7688 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7689 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7690 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7691 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7692 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7693 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7694 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7695 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7696 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7697 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7698 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7699 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7700 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7701 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7702 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7703 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7704 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7705 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7706 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7707 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7708 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7709 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7710 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7711 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7712 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7713 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7714 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7715 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7716 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7717 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7718 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7721 Version 1.6.0 (2016-01-21)
7722 ==========================
7727 * The `#![no_std]` attribute causes a crate to not be linked to the
7728 standard library, but only the [core library][1.6co], as described
7729 in [RFC 1184]. The core library defines common types and traits but
7730 has no platform dependencies whatsoever, and is the basis for Rust
7731 software in environments that cannot support a full port of the
7732 standard library, such as operating systems. Most of the core
7733 library is now stable.
7739 [`Read::read_exact`],
7740 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7741 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7742 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7743 [`os::unix::fs::DirBuilderExt`],
7744 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7745 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7746 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7747 [`collections::hash_map::Drain`],
7748 [`collections::hash_map::HashMap::drain`],
7749 [`collections::hash_set::Drain`],
7750 [`collections::hash_set::HashSet::drain`],
7751 [`collections::binary_heap::Drain`],
7752 [`collections::binary_heap::BinaryHeap::drain`],
7753 [`Vec::extend_from_slice`] (renamed from `push_all`),
7754 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7755 [`RwLock::into_inner`],
7756 [`Iterator::min_by_key`] (renamed from `min_by`),
7757 [`Iterator::max_by_key`] (renamed from `max_by`).
7758 * The [core library][1.6co] is stable, as are most of its APIs.
7759 * [The `assert_eq!` macro supports arguments that don't implement
7760 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7762 * Several timer functions that take duration in milliseconds [are
7763 deprecated in favor of those that take `Duration`][1.6ms]. These
7764 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7765 `thread::park_timeout_ms`.
7766 * The algorithm by which `Vec` reserves additional elements was
7767 [tweaked to not allocate excessive space][1.6a] while still growing
7769 * `From` conversions are [implemented from integers to floats][1.6f]
7770 in cases where the conversion is lossless. Thus they are not
7771 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7772 or `f64`. They are also not implemented for `isize` and `usize`
7773 because the implementations would be platform-specific. `From` is
7774 also implemented from `f32` to `f64`.
7775 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7776 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7777 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7778 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7780 * Sorting slices that are already sorted [is 50% faster in some
7786 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7787 * Cargo build scripts can specify their dependencies by emitting the
7788 [`rerun-if-changed`][1.6rr] key.
7789 * crates.io will reject publication of crates with dependencies that
7790 have a wildcard version constraint. Crates with wildcard
7791 dependencies were seen to cause a variety of problems, as described
7792 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7794 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7795 release folder. A variety of artifacts that Cargo failed to clean
7796 are now correctly deleted.
7801 * The `unreachable_code` lint [warns when a function call's argument
7803 * The parser indicates [failures that may be caused by
7804 confusingly-similar Unicode characters][1.6uc]
7805 * Certain macro errors [are reported at definition time][1.6m], not
7811 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7812 environment variable when locating crates. This was a pre-cargo
7813 feature for integrating with the package manager that was
7814 accidentally never removed.
7815 * [A number of bugs were fixed in the privacy checker][1.6p] that
7816 could cause previously-accepted code to break.
7817 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7818 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7819 struct pattern syntax (`Foo(..)`) can no longer be used to match
7820 unit structs. This is a warning now, but will become an error in
7821 future releases. Patterns that share the same name as a const are
7823 * A bug was fixed that causes [rustc not to apply default type
7824 parameters][1.6xc] when resolving certain method implementations of
7825 traits defined in other crates.
7827 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7828 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7829 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7830 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7831 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7832 [1.6co]: http://doc.rust-lang.org/core/index.html
7833 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7834 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7835 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7836 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7837 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7838 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7839 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7840 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7841 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7842 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7843 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7844 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7845 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7846 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7847 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7848 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7849 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7850 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7851 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7852 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7853 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7854 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7855 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7856 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7857 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7858 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7859 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7860 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7861 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7862 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7863 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7864 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7865 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7866 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7867 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7868 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7869 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7870 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7871 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7872 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7873 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7876 Version 1.5.0 (2015-12-10)
7877 ==========================
7879 * ~700 changes, numerous bugfixes
7885 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7886 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7887 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7888 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7889 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7890 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7891 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7892 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7893 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7894 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7895 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7896 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7897 [`Path::read_link`], [`Path::symlink_metadata`],
7898 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7899 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7900 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7901 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7902 [`slice::split_first_mut`], [`slice::split_first`],
7903 [`slice::split_last_mut`], [`slice::split_last`],
7904 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7905 [`str::MatchIndices`], [`str::RMatchIndices`],
7906 [`str::match_indices`], [`str::rmatch_indices`],
7907 [`str::slice_mut_unchecked`], [`string::ParseError`].
7908 * Rust applications hosted on crates.io can be installed locally to
7909 `~/.cargo/bin` with the [`cargo install`] command. Among other
7910 things this makes it easier to augment Cargo with new subcommands:
7911 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7912 invoked as `cargo foo`.
7913 * Crates with wildcard (`*`) dependencies will [emit warnings when
7914 published][1.5w]. In 1.6 it will no longer be possible to publish
7915 crates with wildcard dependencies.
7920 * The rules determining when a particular lifetime must outlive
7921 a particular value (known as '[dropck]') have been [modified
7922 to not rely on parametricity][1.5p].
7923 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7924 and `Arc`][1.5a]. Because these smart pointer types implement
7925 `Deref`, this causes breakage in cases where the interior type
7926 contains methods of the same name.
7927 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7928 that they could drop their content. Soundness fix.
7929 * All method invocations are [properly checked][1.5wf1] for
7930 [well-formedness][1.5wf2]. Soundness fix.
7931 * Traits whose supertraits contain `Self` are [not object
7932 safe][1.5o]. Soundness fix.
7933 * Target specifications support a [`no_default_libraries`][1.5nd]
7934 setting that controls whether `-nodefaultlibs` is passed to the
7935 linker, and in turn the `is_like_windows` setting no longer affects
7936 the `-nodefaultlibs` flag.
7937 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7938 * The `#[inline]` and `#[repr]` attributes [can only appear
7939 in valid locations][1.5at].
7940 * Native libraries linked from the local crate are [passed to
7941 the linker before native libraries from upstream crates][1.5nl].
7942 * Two rarely-used attributes, `#[no_debug]` and
7943 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7944 * Negation of unsigned integers, which has been a warning for
7945 several releases, [is now behind a feature gate and will
7946 generate errors][1.5nu].
7947 * The parser accidentally accepted visibility modifiers on
7948 enum variants, a bug [which has been fixed][1.5ev].
7949 * [A bug was fixed that allowed `use` statements to import unstable
7955 * When evaluating expressions at compile-time that are not
7956 compile-time constants (const-evaluating expressions in non-const
7957 contexts), incorrect code such as overlong bitshifts and arithmetic
7958 overflow will [generate a warning instead of an error][1.5ce],
7959 delaying the error until runtime. This will allow the
7960 const-evaluator to be expanded in the future backwards-compatibly.
7961 * The `improper_ctypes` lint [no longer warns about using `isize` and
7962 `usize` in FFI][1.5ict].
7967 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7969 * `Default` is [implemented for mutable slices][1.5d].
7970 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7971 * There are now `From` conversions [between floating point
7972 types][1.5f] where the conversions are lossless.
7973 * There are now `From` conversions [between integer types][1.5i] where
7974 the conversions are lossless.
7975 * [`fs::Metadata` implements `Clone`][1.5fs].
7976 * The `parse` method [accepts a leading "+" when parsing
7978 * [`AsMut` is implemented for `Vec`][1.5am].
7979 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7980 been optimized][1.5cf] and no longer rely on the default impl.
7981 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7982 `unsafe extern "C"` function types now [implement `Clone`,
7983 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7984 `fmt::Debug` for up to 12 arguments][1.5fp].
7985 * [Dropping `Vec`s is much faster in unoptimized builds when the
7986 element types don't implement `Drop`][1.5dv].
7987 * A bug that caused in incorrect behavior when [combining `VecDeque`
7988 with zero-sized types][1.5vdz] was resolved.
7989 * [`PartialOrd` for slices is faster][1.5po].
7994 * [Crate metadata size was reduced by 20%][1.5md].
7995 * [Improvements to code generation reduced the size of libcore by 3.3
7996 MB and rustc's memory usage by 18MB][1.5m].
7997 * [Improvements to deref translation increased performance in
7998 unoptimized builds][1.5dr].
7999 * Various errors in trait resolution [are deduplicated to only be
8000 reported once][1.5te].
8001 * Rust has preliminary [support for rumprun kernels][1.5rr].
8002 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8004 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8005 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8006 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8007 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8008 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8009 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8010 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8011 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8012 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8013 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8014 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8015 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8016 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8017 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8018 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8019 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8020 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8021 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8022 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8023 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8024 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8025 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8026 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8027 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8028 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8029 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8030 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8031 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8032 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8033 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8034 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8035 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8036 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8037 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8038 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8039 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8040 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8041 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8042 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8043 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8044 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8045 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8046 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8047 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8048 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8049 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8050 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8051 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8052 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8053 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8054 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8055 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8056 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8057 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8058 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8059 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8060 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8061 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8062 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8063 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8064 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8065 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8066 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8067 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8068 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8069 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8070 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8071 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8072 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8073 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8074 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8075 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8076 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8077 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8078 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8079 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8080 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8081 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8082 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8083 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8084 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8085 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8086 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8087 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8088 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8089 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8090 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8091 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8092 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8094 Version 1.4.0 (2015-10-29)
8095 ==========================
8097 * ~1200 changes, numerous bugfixes
8102 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8103 GNU) are now supported and recommended for use.
8108 * [Several changes have been made to fix type soundness and improve
8109 the behavior of associated types][sound]. See [RFC 1214]. Although
8110 we have mostly introduced these changes as warnings this release, to
8111 become errors next release, there are still some scenarios that will
8112 see immediate breakage.
8113 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8114 line breaks in addition to `\n`][crlf].
8115 * [Loans of `'static` lifetime extend to the end of a function][stat].
8116 * [`str::parse` no longer introduces avoidable rounding error when
8117 parsing floating point numbers. Together with earlier changes to
8118 float formatting/output, "round trips" like f.to_string().parse()
8119 now preserve the value of f exactly. Additionally, leading plus
8120 signs are now accepted][fp3].
8126 * `use` statements that import multiple items [can now rename
8127 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8128 * [Binops work correctly on fat pointers][binfat].
8129 * `pub extern crate`, which does not behave as expected, [issues a
8130 warning][pec] until a better solution is found.
8135 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8136 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8137 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8138 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8139 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8140 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8141 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8142 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8143 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8144 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8145 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8146 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8147 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8148 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8149 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8150 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8151 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8152 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8154 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8155 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8156 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8157 `f64::from_str_radix`.
8158 * [Reverse-searching strings is faster with the 'two-way'
8160 * [`std::io::copy` allows `?Sized` arguments][cc].
8161 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8162 [override `count`, `nth` and `last` with an O(1)
8163 implementation][it].
8164 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8165 * [`IntoRawFd` has been added to the Unix-specific prelude,
8166 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8168 * [`Extend<String>` and `FromIterator<String` are both implemented for
8170 * [`IntoIterator` is implemented for references to `Option` and
8172 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8173 Copy`][ext] as part of [RFC 839]. This will cause type inference
8174 breakage in rare situations.
8175 * [`BinaryHeap` implements `Debug`][bh2].
8176 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8178 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8179 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8180 * [String comparison is faster][faststr].
8181 * `&mut T` where `T: std::fmt::Write` [also implements
8182 `std::fmt::Write`][mutw].
8183 * [A stable regression in `VecDeque::push_back` and other
8184 capacity-altering methods that caused panics for zero-sized types
8186 * [Function pointers implement traits for up to 12 parameters][fp2].
8191 * The compiler [no longer uses the 'morestack' feature to prevent
8192 stack overflow][mm]. Instead it uses guard pages and stack
8193 probes (though stack probes are not yet implemented on any platform
8195 * [The compiler matches traits faster when projections are involved][p].
8196 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8198 * [Cargo now displays useful information about what its doing during
8199 `cargo update`][cu].
8201 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8202 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8203 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8204 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8205 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8206 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8207 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8208 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8209 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8210 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8211 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8212 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8213 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8214 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8215 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8216 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8217 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8218 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8219 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8220 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8221 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8222 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8223 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8224 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8225 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8226 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8227 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8228 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8229 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8230 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8231 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8232 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8233 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8234 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8235 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8236 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8237 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8238 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8239 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8240 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8241 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8242 [bh2]: https://github.com/rust-lang/rust/pull/28156
8243 [binfat]: https://github.com/rust-lang/rust/pull/28270
8244 [bm]: https://github.com/rust-lang/rust/pull/28197
8245 [cc]: https://github.com/rust-lang/rust/pull/27531
8246 [crlf]: https://github.com/rust-lang/rust/pull/28034
8247 [cu]: https://github.com/rust-lang/cargo/pull/1931
8248 [d]: https://github.com/rust-lang/rust/pull/27825
8249 [dep]: https://github.com/rust-lang/rust/pull/28339
8250 [es]: https://github.com/rust-lang/rust/pull/27956
8251 [ext]: https://github.com/rust-lang/rust/pull/28094
8252 [faststr]: https://github.com/rust-lang/rust/pull/28338
8253 [ffi]: https://github.com/rust-lang/rust/pull/28779
8254 [fp]: https://github.com/rust-lang/rust/pull/28268
8255 [fp2]: https://github.com/rust-lang/rust/pull/28560
8256 [fp3]: https://github.com/rust-lang/rust/pull/27307
8257 [i]: https://github.com/rust-lang/rust/pull/27451
8258 [into2]: https://github.com/rust-lang/rust/pull/28039
8259 [it]: https://github.com/rust-lang/rust/pull/27652
8260 [mm]: https://github.com/rust-lang/rust/pull/27338
8261 [mutw]: https://github.com/rust-lang/rust/pull/28368
8262 [sound]: https://github.com/rust-lang/rust/pull/27641
8263 [p]: https://github.com/rust-lang/rust/pull/27866
8264 [pec]: https://github.com/rust-lang/rust/pull/28486
8265 [pr]: https://github.com/rust-lang/rust/pull/27896
8266 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8267 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8268 [s]: https://github.com/rust-lang/rust/pull/27474
8269 [stab]: https://github.com/rust-lang/rust/pull/28339
8270 [stat]: https://github.com/rust-lang/rust/pull/28321
8271 [vd]: https://github.com/rust-lang/rust/pull/28494
8273 Version 1.3.0 (2015-09-17)
8274 ==============================
8276 * ~900 changes, numerous bugfixes
8281 * The [new object lifetime defaults][nold] have been [turned
8282 on][nold2] after a cycle of warnings about the change. Now types
8283 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8284 being interpreted as `&'a Box<Trait+'a>` to `&'a
8285 Box<Trait+'static>`.
8286 * [The Rustonomicon][nom] is a new book in the official documentation
8287 that dives into writing unsafe Rust.
8288 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8289 timekeeping is employed by other std APIs, as well as out-of-tree
8295 * The [new object lifetime defaults][nold] have been [turned
8296 on][nold2] after a cycle of warnings about the change.
8297 * There is a known [regression][lr] in how object lifetime elision is
8298 interpreted, the proper solution for which is undetermined.
8299 * The `#[prelude_import]` attribute, an internal implementation
8300 detail, was accidentally stabilized previously. [It has been put
8301 behind the `prelude_import` feature gate][pi]. This change is
8302 believed to break no existing code.
8303 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8304 [more sane for dynamically sized types][dst3]. Code that relied on
8305 the previous behavior is thought to be broken.
8306 * The `dropck` rules, which checks that destructors can't access
8307 destroyed values, [have been updated][dropck] to match the
8308 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8309 cause some previously-compiling code to no longer build.
8314 * The [new object lifetime defaults][nold] have been [turned
8315 on][nold2] after a cycle of warnings about the change.
8316 * Semicolons may [now follow types and paths in
8317 macros](https://github.com/rust-lang/rust/pull/27000).
8318 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8319 [more sane for dynamically sized types][dst3]. Code that relied on
8320 the previous behavior is not known to exist, and suspected to be
8322 * `'static` variables [may now be recursive][st].
8323 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8324 implementations correctly.
8325 * The `dropck` rules, which checks that destructors can't access
8326 destroyed values, [have been updated][dropck] to match the
8332 * The [`Duration`] API, [has been stabilized][ds], as well as the
8333 `std::time` module, which presently contains only `Duration`.
8334 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8335 * The owned C string, [`CString`], implements [`Borrow`] and the
8336 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8337 these allow C strings to be borrowed and cloned in generic code.
8338 * [`CStr`] implements [`Debug`].
8339 * [`AtomicPtr`] implements [`Debug`].
8340 * [`Error`] trait objects [can be downcast to their concrete types][e]
8341 in many common configurations, using the [`is`], [`downcast`],
8342 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8344 * Searching for substrings now [employs the two-way algorithm][search]
8345 instead of doing a naive search. This gives major speedups to a
8346 number of methods, including [`contains`][sc], [`find`][sf],
8347 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8348 [`ends_with`][sew] are also faster.
8349 * The performance of `PartialEq` for slices is [much faster][ps].
8350 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8351 is overridden and optimized by the implementations for scalars.
8352 * The [`Hasher`] trait now has a number of specialized `write_*`
8353 methods for primitive types, for efficiency.
8354 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8355 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8356 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8357 of [`std::error::Error::cause`][iec] also delegates to the inner
8359 * [`process::Child`][pc] gained the [`id`] method, which returns a
8360 `u32` representing the platform-specific process identifier.
8361 * The [`connect`] method on slices is deprecated, replaced by the new
8362 [`join`] method (note that both of these are on the *unstable*
8363 [`SliceConcatExt`] trait, but through the magic of the prelude are
8364 available to stable code anyway).
8365 * The [`Div`] operator is implemented for [`Wrapping`] types.
8366 * [`DerefMut` is implemented for `String`][dms].
8367 * Performance of SipHash (the default hasher for `HashMap`) is
8368 [better for long data][sh].
8369 * [`AtomicPtr`] implements [`Send`].
8370 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8371 are now [specialized to use uninitialized buffers for increased
8373 * Lifetime parameters of foreign functions [are now resolved
8379 * Rust can now, with some coercion, [produce programs that run on
8380 Windows XP][xp], though XP is not considered a supported platform.
8381 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8382 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8383 recommended for use in 1.3, though should be fully-functional
8384 in the [64-bit 1.4 beta][b14].
8385 * On Fedora-based systems installation will [properly configure the
8386 dynamic linker][fl].
8387 * The compiler gained many new extended error descriptions, which can
8388 be accessed with the `--explain` flag.
8389 * The `dropck` pass, which checks that destructors can't access
8390 destroyed values, [has been rewritten][dropck]. This fixes some
8391 soundness holes, and as such will cause some previously-compiling
8392 code to no longer build.
8393 * `rustc` now uses [LLVM to write archive files where possible][ar].
8394 Eventually this will eliminate the compiler's dependency on the ar
8396 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8397 supported FreeBSD on x86_64).
8398 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8399 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8401 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8402 will kill the process instead of leaking][nlp].
8404 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8405 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8406 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8407 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8408 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8409 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8410 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8411 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8412 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8413 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8414 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8415 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8416 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8417 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8418 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8419 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8420 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8421 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8422 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8423 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8424 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8425 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8426 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8427 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8428 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8429 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8430 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8431 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8432 [ar]: https://github.com/rust-lang/rust/pull/26926
8433 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8434 [dms]: https://github.com/rust-lang/rust/pull/26241
8435 [dropck]: https://github.com/rust-lang/rust/pull/27261
8436 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8437 [ds]: https://github.com/rust-lang/rust/pull/26818
8438 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8439 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8440 [dst3]: https://github.com/rust-lang/rust/pull/27351
8441 [e]: https://github.com/rust-lang/rust/pull/24793
8442 [f]: https://github.com/rust-lang/rust/pull/26588
8443 [fb]: https://github.com/rust-lang/rust/pull/26959
8444 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8445 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8446 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8447 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8448 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8449 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8450 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8451 [lic]: https://github.com/rust-lang/rust/pull/26583
8452 [lnu]: https://github.com/rust-lang/rust/pull/27026
8453 [lr]: https://github.com/rust-lang/rust/issues/27248
8454 [lum]: https://github.com/rust-lang/rust/pull/26378
8455 [lur]: https://github.com/rust-lang/rust/pull/26783
8456 [nlp]: https://github.com/rust-lang/rust/pull/27176
8457 [nold2]: https://github.com/rust-lang/rust/pull/27045
8458 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8459 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8460 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8461 [pi]: https://github.com/rust-lang/rust/pull/26699
8462 [ps]: https://github.com/rust-lang/rust/pull/26884
8463 [rte]: https://github.com/rust-lang/rust/pull/26950
8464 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8465 [search]: https://github.com/rust-lang/rust/pull/26327
8466 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8467 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8468 [sh]: https://github.com/rust-lang/rust/pull/27280
8469 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8470 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8471 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8472 [st]: https://github.com/rust-lang/rust/pull/26630
8473 [win1]: https://github.com/rust-lang/rust/pull/26569
8474 [win2]: https://github.com/rust-lang/rust/pull/26741
8475 [win3]: https://github.com/rust-lang/rust/pull/26741
8476 [win4]: https://github.com/rust-lang/rust/pull/27210
8477 [xp]: https://github.com/rust-lang/rust/pull/26569
8479 Version 1.2.0 (2015-08-07)
8480 ==========================
8482 * ~1200 changes, numerous bugfixes
8487 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8488 like `Rc` to contain types without a fixed size, arrays and trait
8489 objects, finally enabling use of `Rc<[T]>` and completing the
8490 implementation of DST.
8491 * [Parallel codegen][parcodegen] is now working again, which can
8492 substantially speed up large builds in debug mode; It also gets
8493 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8494 jobs). It's not enabled by default, but will be "in the near
8495 future". It can be activated with the `-C codegen-units=N` flag to
8497 * This is the first release with [experimental support for linking
8498 with the MSVC linker and lib C on Windows (instead of using the GNU
8499 variants via MinGW)][win]. It is yet recommended only for the most
8500 intrepid Rustaceans.
8501 * Benchmark compilations are showing a 30% improvement in
8502 bootstrapping over 1.1.
8507 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8508 unicode case mapping, which is a previously-planned change in
8509 behavior and considered a bugfix.
8510 * [`mem::align_of`] now specifies [the *minimum alignment* for
8511 T][align], which is usually the alignment programs are interested
8512 in, and the same value reported by clang's
8513 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8515 * [The `#[packed]` attribute is no longer silently accepted by the
8516 compiler][packed]. This attribute did nothing and code that
8517 mentioned it likely did not work as intended.
8518 * Associated type defaults are [now behind the
8519 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8520 defaults *did not work*, but could be mentioned syntactically. As
8521 such this breakage has minimal impact.
8526 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8527 matching against dereferenceable values.
8532 * The [`Extend`] trait, which grows a collection from an iterator, is
8533 implemented over iterators of references, for `String`, `Vec`,
8534 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8535 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8536 * The [`iter::once`] function returns an iterator that yields a single
8537 element, and [`iter::empty`] returns an iterator that yields no
8539 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8540 over substring matches.
8541 * [`Cell`] and [`RefCell`] both implement `Eq`.
8542 * A number of methods for wrapping arithmetic are added to the
8543 integral types, [`wrapping_div`], [`wrapping_rem`],
8544 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8545 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8546 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8547 type.. It is illegal for the default arithmetic operations in Rust
8548 to overflow; the desire to wrap must be explicit.
8549 * The `{:#?}` formatting specifier [displays the alternate,
8550 pretty-printed][debugfmt] form of the `Debug` formatter. This
8551 feature was actually introduced prior to 1.0 with little
8553 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8554 for writing data to formatted strings, similar to [`io::Write`].
8555 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8556 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8557 are used by code generators to emit implementations of [`Debug`].
8558 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8559 methods that convert case, following Unicode case mapping.
8560 * It is now easier to handle poisoned locks. The [`PoisonError`]
8561 type, returned by failing lock operations, exposes `into_inner`,
8562 `get_ref`, and `get_mut`, which all give access to the inner lock
8563 guard, and allow the poisoned lock to continue to operate. The
8564 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8565 poisoned lock without attempting to take the lock.
8566 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8567 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8568 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8569 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8571 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8577 * `rustc` employs smarter heuristics for guessing at [typos].
8578 * `rustc` emits more efficient code for [no-op conversions between
8579 unsafe pointers][nop].
8580 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8581 resulting in faster compile times and smaller code.
8583 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8584 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8585 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8586 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8587 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8588 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8589 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8590 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8591 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8592 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8593 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8594 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8595 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8596 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8597 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8598 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8599 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8600 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8601 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8602 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8603 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8604 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8605 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8606 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8607 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8608 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8609 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8610 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8611 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8612 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8613 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8614 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8615 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8616 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8617 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8618 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8619 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8620 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8621 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8622 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8623 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8624 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8625 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8626 [align]: https://github.com/rust-lang/rust/pull/25646
8627 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8628 [typos]: https://github.com/rust-lang/rust/pull/26087
8629 [nop]: https://github.com/rust-lang/rust/pull/26336
8630 [fat]: https://github.com/rust-lang/rust/pull/26411
8631 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8632 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8633 [packed]: https://github.com/rust-lang/rust/pull/25541
8634 [ad]: https://github.com/rust-lang/rust/pull/27382
8635 [win]: https://github.com/rust-lang/rust/pull/25350
8637 Version 1.1.0 (2015-06-25)
8638 =========================
8640 * ~850 changes, numerous bugfixes
8645 * The [`std::fs` module has been expanded][fs] to expand the set of
8646 functionality exposed:
8647 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8648 don't incur a syscall on some platforms.
8649 * A `symlink_metadata` function has been added.
8650 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8651 access to all underlying information.
8652 * The compiler now contains extended explanations of many errors. When an error
8653 with an explanation occurs the compiler suggests using the `--explain` flag
8654 to read the explanation. Error explanations are also [available online][err-index].
8655 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8656 well as other work, the time to bootstrap the compiler decreased by
8662 * The [`str::split_whitespace`] method splits a string on unicode
8663 whitespace boundaries.
8664 * On both Windows and Unix, new extension traits provide conversion of
8665 I/O types to and from the underlying system handles. On Unix, these
8666 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8667 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8668 `TcpListener`, and `UpdSocket`. Further implementations for
8669 `std::process` will be stabilized later.
8670 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8671 Windows, symlinks can be created with
8672 `std::os::windows::symlink_dir` and
8673 `std::os::windows::symlink_file`.
8674 * The `mpsc::Receiver` type can now be converted into an iterator with
8675 `into_iter` on the [`IntoIterator`] trait.
8676 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8677 implementation of the [`From`] trait.
8678 * The `Debug` implementation for `RangeFull` [creates output that is
8679 more consistent with other implementations][rf].
8680 * [`Debug` is implemented for `File`][file].
8681 * The `Default` implementation for `Arc` [no longer requires `Sync +
8683 * [The `Iterator` methods `count`, `nth`, and `last` have been
8684 overridden for slices to have O(1) performance instead of O(n)][si].
8685 * Incorrect handling of paths on Windows has been improved in both the
8686 compiler and the standard library.
8687 * [`AtomicPtr` gained a `Default` implementation][ap].
8688 * In accordance with Rust's policy on arithmetic overflow `abs` now
8689 [panics on overflow when debug assertions are enabled][abs].
8690 * The [`Cloned`] iterator, which was accidentally left unstable for
8691 1.0 [has been stabilized][c].
8692 * The [`Incoming`] iterator, which iterates over incoming TCP
8693 connections, and which was accidentally unnamable in 1.0, [is now
8694 properly exported][inc].
8695 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8696 `sift_up` or `sift_down` panic][bh].
8697 * The [`split_off`] method of `LinkedList` [no longer corrupts
8698 the list in certain scenarios][ll].
8703 * Type checking performance [has improved notably][sk] with
8704 [multiple improvements][pre].
8705 * The compiler [suggests code changes][ch] for more errors.
8706 * rustc and it's build system have experimental support for [building
8707 toolchains against MUSL][m] instead of glibc on Linux.
8708 * The compiler defines the `target_env` cfg value, which is used for
8709 distinguishing toolchains that are otherwise for the same
8710 platform. Presently this is set to `gnu` for common GNU Linux
8711 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8712 * The [`cargo rustc`][crc] command invokes a build with custom flags
8714 * [Android executables are always position independent][pie].
8715 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8718 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8719 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8720 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8721 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8722 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8723 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8724 [rf]: https://github.com/rust-lang/rust/pull/24491
8725 [err-index]: https://doc.rust-lang.org/error-index.html
8726 [sk]: https://github.com/rust-lang/rust/pull/24615
8727 [pre]: https://github.com/rust-lang/rust/pull/25323
8728 [file]: https://github.com/rust-lang/rust/pull/24598
8729 [ch]: https://github.com/rust-lang/rust/pull/24683
8730 [arc]: https://github.com/rust-lang/rust/pull/24695
8731 [si]: https://github.com/rust-lang/rust/pull/24701
8732 [ap]: https://github.com/rust-lang/rust/pull/24834
8733 [m]: https://github.com/rust-lang/rust/pull/24777
8734 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8735 [crc]: https://github.com/rust-lang/cargo/pull/1568
8736 [pie]: https://github.com/rust-lang/rust/pull/24953
8737 [abs]: https://github.com/rust-lang/rust/pull/25441
8738 [c]: https://github.com/rust-lang/rust/pull/25496
8739 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8740 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8741 [inc]: https://github.com/rust-lang/rust/pull/25522
8742 [bh]: https://github.com/rust-lang/rust/pull/25856
8743 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8744 [ll]: https://github.com/rust-lang/rust/pull/26022
8745 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8746 [drop]: https://github.com/rust-lang/rust/pull/24935
8748 Version 1.0.0 (2015-05-15)
8749 ========================
8751 * ~1500 changes, numerous bugfixes
8756 * The vast majority of the standard library is now `#[stable]`. It is
8757 no longer possible to use unstable features with a stable build of
8759 * Many popular crates on [crates.io] now work on the stable release
8761 * Arithmetic on basic integer types now [checks for overflow in debug
8767 * Several [restrictions have been added to trait coherence][coh] in
8768 order to make it easier for upstream authors to change traits
8769 without breaking downstream code.
8770 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8771 improve error messages and macro behavior. For example, `0b1234` is
8772 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8773 * Trait bounds [are always invariant][inv], eliminating the need for
8774 the `PhantomFn` and `MarkerTrait` lang items, which have been
8776 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8777 "foo" as bar` syntax has been replaced with `extern crate foo as
8778 bar`, and Cargo now automatically translates "-" in *package* names
8779 to underscore for the crate name.
8780 * [Lifetime shadowing is an error][lt].
8781 * [`Send` no longer implies `'static`][send-rfc].
8782 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8783 `MyType::default()`.
8784 * Primitive types [now have inherent methods][prim-inherent],
8785 obviating the need for extension traits like `SliceExt`.
8786 * Methods with `Self: Sized` in their `where` clause are [considered
8787 object-safe][self-sized], allowing many extension traits like
8788 `IteratorExt` to be merged into the traits they extended.
8789 * You can now [refer to associated types][assoc-where] whose
8790 corresponding trait bounds appear only in a `where` clause.
8791 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8792 like `Send` and `Sync` are now library-defined.
8793 * A [Reflect trait][reflect] was introduced, which means that
8794 downcasting via the `Any` trait is effectively limited to concrete
8795 types. This helps retain the potentially-important "parametricity"
8796 property: generic code cannot behave differently for different type
8797 arguments except in minor ways.
8798 * The `unsafe_destructor` feature is now deprecated in favor of the
8799 [new `dropck`][dropck]. This change is a major reduction in unsafe
8805 * The `thread_local` module [has been renamed to `std::thread`][th].
8806 * The methods of `IteratorExt` [have been moved to the `Iterator`
8808 * Several traits that implement Rust's conventions for type
8809 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8810 [centralized in the `std::convert` module][con].
8811 * The `FromError` trait [was removed in favor of `From`][fe].
8812 * The basic sleep function [has moved to
8813 `std::thread::sleep_ms`][slp].
8814 * The `splitn` function now takes an `n` parameter that represents the
8815 number of items yielded by the returned iterator [instead of the
8816 number of 'splits'][spl].
8817 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8818 * [Derived implementations of `PartialOrd` now order enums according
8819 to their explicitly-assigned discriminants][po].
8820 * [Methods for searching strings are generic over `Pattern`s][pat],
8821 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8823 * [In method resolution, object methods are resolved before inherent
8825 * [`String::from_str` has been deprecated in favor of the `From` impl,
8826 `String::from`][sf].
8827 * [`io::Error` implements `Sync`][ios].
8828 * [The `words` method on `&str` has been replaced with
8829 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8831 * The new path and IO modules are complete and `#[stable]`. This
8832 was the major library focus for this cycle.
8833 * The path API was [revised][path-normalize] to normalize `.`,
8834 adjusting the tradeoffs in favor of the most common usage.
8835 * A large number of remaining APIs in `std` were also stabilized
8836 during this cycle; about 75% of the non-deprecated API surface
8838 * The new [string pattern API][string-pattern] landed, which makes
8839 the string slice API much more internally consistent and flexible.
8840 * A new set of [generic conversion traits][conversion] replaced
8841 many existing ad hoc traits.
8842 * Generic numeric traits were [completely removed][num-traits]. This
8843 was made possible thanks to inherent methods for primitive types,
8844 and the removal gives maximal flexibility for designing a numeric
8845 hierarchy in the future.
8846 * The `Fn` traits are now related via [inheritance][fn-inherit]
8847 and provide ergonomic [blanket implementations][fn-blanket].
8848 * The `Index` and `IndexMut` traits were changed to
8849 [take the index by value][index-value], enabling code like
8850 `hash_map["string"]` to work.
8851 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8852 `Copy` data is known to be `Clone` as well.
8857 * Many errors now have extended explanations that can be accessed with
8858 the `--explain` flag to `rustc`.
8859 * Many new examples have been added to the standard library
8861 * rustdoc has received a number of improvements focused on completion
8863 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8864 * Much headway was made on ecosystem-wide CI, making it possible
8865 to [compare builds for breakage][ci-compare].
8868 [crates.io]: http://crates.io
8869 [clo]: https://github.com/rust-lang/rust/pull/24034
8870 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8871 [con]: https://github.com/rust-lang/rust/pull/23875
8872 [cr]: https://github.com/rust-lang/rust/pull/23419
8873 [fe]: https://github.com/rust-lang/rust/pull/23879
8874 [ie]: https://github.com/rust-lang/rust/pull/23300
8875 [inv]: https://github.com/rust-lang/rust/pull/23938
8876 [ios]: https://github.com/rust-lang/rust/pull/24133
8877 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8878 [lt]: https://github.com/rust-lang/rust/pull/24057
8879 [meth]: https://github.com/rust-lang/rust/pull/24056
8880 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8881 [po]: https://github.com/rust-lang/rust/pull/24270
8882 [sf]: https://github.com/rust-lang/rust/pull/24517
8883 [slp]: https://github.com/rust-lang/rust/pull/23949
8884 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8885 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8886 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8887 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8888 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8889 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8890 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8891 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8892 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8893 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8894 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8895 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8896 [reflect]: https://github.com/rust-lang/rust/pull/23712
8897 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8898 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8899 [index-value]: https://github.com/rust-lang/rust/pull/23601
8900 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8901 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8902 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8903 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8904 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8905 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8908 Version 1.0.0-alpha.2 (2015-02-20)
8909 =====================================
8911 * ~1300 changes, numerous bugfixes
8915 * The various I/O modules were [overhauled][io-rfc] to reduce
8916 unnecessary abstractions and provide better interoperation with
8917 the underlying platform. The old `io` module remains temporarily
8919 * The standard library now [participates in feature gating][feat],
8920 so use of unstable libraries now requires a `#![feature(...)]`
8921 attribute. The impact of this change is [described on the
8922 forum][feat-forum]. [RFC][feat-rfc].
8926 * `for` loops [now operate on the `IntoIterator` trait][into],
8927 which eliminates the need to call `.iter()`, etc. to iterate
8928 over collections. There are some new subtleties to remember
8929 though regarding what sort of iterators various types yield, in
8930 particular that `for foo in bar { }` yields values from a move
8931 iterator, destroying the original collection. [RFC][into-rfc].
8932 * Objects now have [default lifetime bounds][obj], so you don't
8933 have to write `Box<Trait+'static>` when you don't care about
8934 storing references. [RFC][obj-rfc].
8935 * In types that implement `Drop`, [lifetimes must outlive the
8936 value][drop]. This will soon make it possible to safely
8937 implement `Drop` for types where `#[unsafe_destructor]` is now
8938 required. Read the [gorgeous RFC][drop-rfc] for details.
8939 * The fully qualified <T as Trait>::X syntax lets you set the Self
8940 type for a trait method or associated type. [RFC][ufcs-rfc].
8941 * References to types that implement `Deref<U>` now [automatically
8942 coerce to references][deref] to the dereferenced type `U`,
8943 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8944 should eliminate many unsightly uses of `&*`, as when converting
8945 from references to vectors into references to
8946 slices. [RFC][deref-rfc].
8947 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8948 `|:|`) is obsolete and closure kind is inferred from context.
8949 * [`Self` is a keyword][Self].
8953 * The `Show` and `String` formatting traits [have been
8954 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8955 their related purposes. Automatically getting a string
8956 conversion to use with `format!("{:?}", something_to_debug)` is
8957 now written `#[derive(Debug)]`.
8958 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8959 OsStr}`, provide strings in platform-specific encodings for easier
8960 interop with system APIs. [RFC][osstr-rfc].
8961 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8962 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8963 creating raw pointers.
8967 * Certain long error messages of the form 'expected foo found bar'
8968 are now [split neatly across multiple
8969 lines][multiline]. Examples in the PR.
8970 * On Unix Rust can be [uninstalled][un] by running
8971 `/usr/local/lib/rustlib/uninstall.sh`.
8972 * The `#[rustc_on_unimplemented]` attribute, requiring the
8973 'on_unimplemented' feature, lets rustc [display custom error
8974 messages when a trait is expected to be implemented for a type
8979 * Rust is tested against a [LALR grammar][lalr], which parses
8980 almost all the Rust files that rustc does.
8982 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8983 [close]: https://github.com/rust-lang/rust/pull/21843
8984 [deref]: https://github.com/rust-lang/rust/pull/21351
8985 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8986 [drop]: https://github.com/rust-lang/rust/pull/21972
8987 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8988 [feat]: https://github.com/rust-lang/rust/pull/21248
8989 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8990 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8991 [fmt]: https://github.com/rust-lang/rust/pull/21457
8992 [into]: https://github.com/rust-lang/rust/pull/20790
8993 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8994 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8995 [lalr]: https://github.com/rust-lang/rust/pull/21452
8996 [multiline]: https://github.com/rust-lang/rust/pull/19870
8997 [obj]: https://github.com/rust-lang/rust/pull/22230
8998 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8999 [onun]: https://github.com/rust-lang/rust/pull/20889
9000 [osstr]: https://github.com/rust-lang/rust/pull/21488
9001 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9002 [Self]: https://github.com/rust-lang/rust/pull/22158
9003 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9004 [un]: https://github.com/rust-lang/rust/pull/22256
9007 Version 1.0.0-alpha (2015-01-09)
9008 ==================================
9010 * ~2400 changes, numerous bugfixes
9014 * The language itself is considered feature complete for 1.0,
9015 though there will be many usability improvements and bugfixes
9016 before the final release.
9017 * Nearly 50% of the public API surface of the standard library has
9018 been declared 'stable'. Those interfaces are unlikely to change
9020 * The long-running debate over integer types has been
9021 [settled][ints]: Rust will ship with types named `isize` and
9022 `usize`, rather than `int` and `uint`, for pointer-sized
9023 integers. Guidelines will be rolled out during the alpha cycle.
9024 * Most crates that are not `std` have been moved out of the Rust
9025 distribution into the Cargo ecosystem so they can evolve
9026 separately and don't need to be stabilized as quickly, including
9027 'time', 'getopts', 'num', 'regex', and 'term'.
9028 * Documentation continues to be expanded with more API coverage, more
9029 examples, and more in-depth explanations. The guides have been
9030 consolidated into [The Rust Programming Language][trpl].
9031 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9032 * All official Rust binary installers now come with [Cargo], the
9033 Rust package manager.
9037 * Closures have been [completely redesigned][unboxed] to be
9038 implemented in terms of traits, can now be used as generic type
9039 bounds and thus monomorphized and inlined, or via an opaque
9040 pointer (boxed) as in the old system. The new system is often
9041 referred to as 'unboxed' closures.
9042 * Traits now support [associated types][assoc], allowing families
9043 of related types to be defined together and used generically in
9045 * Enum variants are [namespaced by their type names][enum].
9046 * [`where` clauses][where] provide a more versatile and attractive
9047 syntax for specifying generic bounds, though the previous syntax
9049 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9051 * Rust [no longer has a runtime][rt] of any description, and only
9052 supports OS threads, not green threads.
9053 * At long last, Rust has been overhauled for 'dynamically-sized
9054 types' ([DST]), which integrates 'fat pointers' (object types,
9055 arrays, and `str`) more deeply into the type system, making it
9057 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9058 `..j` that produce range types and which, when combined with the
9059 `Index` operator and multidispatch, leads to a convenient slice
9061 * The new range syntax revealed an ambiguity in the fixed-length
9062 array syntax, so now fixed length arrays [are written `[T;
9064 * The `Copy` trait is no longer implemented automatically. Unsafe
9065 pointers no longer implement `Sync` and `Send` so types
9066 containing them don't automatically either. `Sync` and `Send`
9067 are now 'unsafe traits' so one can "forcibly" implement them via
9068 `unsafe impl` if a type confirms to the requirements for them
9069 even though the internals do not (e.g. structs containing unsafe
9070 pointers like `Arc`). These changes are intended to prevent some
9071 footguns and are collectively known as [opt-in built-in
9072 traits][oibit] (though `Sync` and `Send` will soon become pure
9073 library types unknown to the compiler).
9074 * Operator traits now take their operands [by value][ops], and
9075 comparison traits can use multidispatch to compare one type
9076 against multiple other types, allowing e.g. `String` to be
9077 compared with `&str`.
9078 * `if let` and `while let` are no longer feature-gated.
9079 * Rust has adopted a more [uniform syntax for escaping unicode
9080 characters][unicode].
9081 * `macro_rules!` [has been declared stable][mac]. Though it is a
9082 flawed system it is sufficiently popular that it must be usable
9083 for 1.0. Effort has gone into [future-proofing][mac-future] it
9084 in ways that will allow other macro systems to be developed in
9085 parallel, and won't otherwise impact the evolution of the
9087 * The prelude has been [pared back significantly][prelude] such
9088 that it is the minimum necessary to support the most pervasive
9089 code patterns, and through [generalized where clauses][where]
9090 many of the prelude extension traits have been consolidated.
9091 * Rust's rudimentary reflection [has been removed][refl], as it
9092 incurred too much code generation for little benefit.
9093 * [Struct variants][structvars] are no longer feature-gated.
9094 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9095 known as 'higher-ranked trait bounds', this crucially allows
9096 unboxed closures to work.
9097 * Macros invocations surrounded by parens or square brackets and
9098 not terminated by a semicolon are [parsed as
9099 expressions][macros], which makes expressions like `vec![1i32,
9100 2, 3].len()` work as expected.
9101 * Trait objects now implement their traits automatically, and
9102 traits that can be coerced to objects now must be [object
9104 * Automatically deriving traits is now done with `#[derive(...)]`
9105 not `#[deriving(...)]` for [consistency with other naming
9106 conventions][derive].
9107 * Importing the containing module or enum at the same time as
9108 items or variants they contain is [now done with `self` instead
9109 of `mod`][self], as in use `foo::{self, bar}`
9110 * Glob imports are no longer feature-gated.
9111 * The `box` operator and `box` patterns have been feature-gated
9112 pending a redesign. For now unique boxes should be allocated
9113 like other containers, with `Box::new`.
9117 * A [series][coll1] of [efforts][coll2] to establish
9118 [conventions][coll3] for collections types has resulted in API
9119 improvements throughout the standard library.
9120 * New [APIs for error handling][err] provide ergonomic interop
9121 between error types, and [new conventions][err-conv] describe
9122 more clearly the recommended error handling strategies in Rust.
9123 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9124 it is easier to discuss failure in the context of error handling
9125 without making clarifications as to whether you are referring to
9126 the 'fail' macro or failure more generally.
9127 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9128 syscall when available.
9129 * The 'serialize' crate has been renamed 'rustc-serialize' and
9130 moved out of the distribution to Cargo. Although it is widely
9131 used now, it is expected to be superseded in the near future.
9132 * The `Show` formatter, typically implemented with
9133 `#[derive(Show)]` is [now requested with the `{:?}`
9134 specifier][show] and is intended for use by all types, for uses
9135 such as `println!` debugging. The new `String` formatter must be
9136 implemented by hand, uses the `{}` specifier, and is intended
9137 for full-fidelity conversions of things that can logically be
9138 represented as strings.
9142 * [Flexible target specification][flex] allows rustc's code
9143 generation to be configured to support otherwise-unsupported
9145 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9146 respective debuggers with Rust-appropriate pretty-printing.
9147 * The Windows installation of Rust is distributed with the
9148 MinGW components currently required to link binaries on that
9153 * Nullable enum optimizations have been extended to more types so
9154 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9155 space than the inner types themselves.
9156 * Work has begun on supporting AArch64.
9158 [Cargo]: https://crates.io
9159 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9160 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9161 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9162 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9163 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9164 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9165 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9166 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9167 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9168 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9169 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9170 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9171 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9172 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9173 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9174 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9175 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9176 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9177 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9178 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9179 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9180 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9181 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9182 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9183 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9184 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9185 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9186 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9187 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9188 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9189 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9190 [trpl]: https://doc.rust-lang.org/book/index.html
9191 [rbe]: http://rustbyexample.com/
9194 Version 0.12.0 (2014-10-09)
9195 =============================
9197 * ~1900 changes, numerous bugfixes
9201 * The introductory documentation (now called The Rust Guide) has
9202 been completely rewritten, as have a number of supplementary
9204 * Rust's package manager, Cargo, continues to improve and is
9205 sometimes considered to be quite awesome.
9206 * Many API's in `std` have been reviewed and updated for
9207 consistency with the in-development Rust coding
9208 guidelines. The standard library documentation tracks
9209 stabilization progress.
9210 * Minor libraries have been moved out-of-tree to the rust-lang org
9211 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9212 be installed with Cargo.
9213 * Lifetime elision allows lifetime annotations to be left off of
9214 function declarations in many common scenarios.
9215 * Rust now works on 64-bit Windows.
9218 * Indexing can be overloaded with the `Index` and `IndexMut`
9220 * The `if let` construct takes a branch only if the `let` pattern
9221 matches, currently behind the 'if_let' feature gate.
9222 * 'where clauses', a more flexible syntax for specifying trait
9223 bounds that is more aesthetic, have been added for traits and
9224 free functions. Where clauses will in the future make it
9225 possible to constrain associated types, which would be
9226 impossible with the existing syntax.
9227 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9228 the 'slicing_syntax' feature gate, and can be overloaded with
9229 the `Slice` or `SliceMut` traits.
9230 * The syntax for matching of sub-slices has been changed to use a
9231 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9232 consistency with other uses of `..` and to future-proof
9233 potential additional uses of the syntax.
9234 * The syntax for matching inclusive ranges in patterns has changed
9235 from `0..3` to `0...4` to be consistent with the exclusive range
9237 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9238 c]`) has been put behind the 'advanced_slice_patterns' feature
9239 gate and may be removed in the future.
9240 * Components of tuples and tuple structs can be extracted using
9241 the `value.0` syntax, currently behind the `tuple_indexing`
9243 * The `#[crate_id]` attribute is no longer supported; versioning
9244 is handled by the package manager.
9245 * Renaming crate imports are now written `extern crate foo as bar`
9246 instead of `extern crate bar = foo`.
9247 * Renaming use statements are now written `use foo as bar` instead
9249 * `let` and `match` bindings and argument names in macros are now
9251 * The new, more efficient, closure types ('unboxed closures') have
9252 been added under a feature gate, 'unboxed_closures'. These will
9253 soon replace the existing closure types, once higher-ranked
9254 trait lifetimes are added to the language.
9255 * `move` has been added as a keyword, for indicating closures
9256 that capture by value.
9257 * Mutation and assignment is no longer allowed in pattern guards.
9258 * Generic structs and enums can now have trait bounds.
9259 * The `Share` trait is now called `Sync` to free up the term
9260 'shared' to refer to 'shared reference' (the default reference
9262 * Dynamically-sized types have been mostly implemented,
9263 unifying the behavior of fat-pointer types with the rest of the
9265 * As part of dynamically-sized types, the `Sized` trait has been
9266 introduced, which qualifying types implement by default, and
9267 which type parameters expect by default. To specify that a type
9268 parameter does not need to be sized, write `<Sized? T>`. Most
9269 types are `Sized`, notable exceptions being unsized arrays
9270 (`[T]`) and trait types.
9271 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9272 * Lifetime bounds can now be applied to type parameters and object
9274 * The old, reference counted GC type, `Gc<T>` which was once
9275 denoted by the `@` sigil, has finally been removed. GC will be
9276 revisited in the future.
9279 * Library documentation has been improved for a number of modules.
9280 * Bit-vectors, collections::bitv has been modernized.
9281 * The url crate is deprecated in favor of
9282 http://github.com/servo/rust-url, which can be installed with
9284 * Most I/O stream types can be cloned and subsequently closed from
9286 * A `std::time::Duration` type has been added for use in I/O
9287 methods that rely on timers, as well as in the 'time' crate's
9288 `Timespec` arithmetic.
9289 * The runtime I/O abstraction layer that enabled the green thread
9290 scheduler to do non-thread-blocking I/O has been removed, along
9291 with the libuv-based implementation employed by the green thread
9292 scheduler. This will greatly simplify the future I/O work.
9293 * `collections::btree` has been rewritten to have a more
9294 idiomatic and efficient design.
9297 * rustdoc output now indicates the stability levels of API's.
9298 * The `--crate-name` flag can specify the name of the crate
9299 being compiled, like `#[crate_name]`.
9300 * The `-C metadata` specifies additional metadata to hash into
9301 symbol names, and `-C extra-filename` specifies additional
9302 information to put into the output filename, for use by the
9303 package manager for versioning.
9304 * debug info generation has continued to improve and should be
9305 more reliable under both gdb and lldb.
9306 * rustc has experimental support for compiling in parallel
9307 using the `-C codegen-units` flag.
9308 * rustc no longer encodes rpath information into binaries by
9312 * Stack usage has been optimized with LLVM lifetime annotations.
9313 * Official Rust binaries on Linux are more compatible with older
9314 kernels and distributions, built on CentOS 5.10.
9317 Version 0.11.0 (2014-07-02)
9318 ==========================
9320 * ~1700 changes, numerous bugfixes
9323 * ~[T] has been removed from the language. This type is superseded by
9325 * ~str has been removed from the language. This type is superseded by
9327 * ~T has been removed from the language. This type is superseded by the
9329 * @T has been removed from the language. This type is superseded by the
9330 standard library's std::gc::Gc<T> type.
9331 * Struct fields are now all private by default.
9332 * Vector indices and shift amounts are both required to be a `uint`
9333 instead of any integral type.
9334 * Byte character, byte string, and raw byte string literals are now all
9335 supported by prefixing the normal literal with a `b`.
9336 * Multiple ABIs are no longer allowed in an ABI string
9337 * The syntax for lifetimes on closures/procedures has been tweaked
9338 slightly: `<'a>|A, B|: 'b + K -> T`
9339 * Floating point modulus has been removed from the language; however it
9340 is still provided by a library implementation.
9341 * Private enum variants are now disallowed.
9342 * The `priv` keyword has been removed from the language.
9343 * A closure can no longer be invoked through a &-pointer.
9344 * The `use foo, bar, baz;` syntax has been removed from the language.
9345 * The transmute intrinsic no longer works on type parameters.
9346 * Statics now allow blocks/items in their definition.
9347 * Trait bounds are separated from objects with + instead of : now.
9348 * Objects can no longer be read while they are mutably borrowed.
9349 * The address of a static is now marked as insignificant unless the
9350 #[inline(never)] attribute is placed it.
9351 * The #[unsafe_destructor] attribute is now behind a feature gate.
9352 * Struct literals are no longer allowed in ambiguous positions such as
9353 if, while, match, and for..in.
9354 * Declaration of lang items and intrinsics are now feature-gated by
9356 * Integral literals no longer default to `int`, and floating point
9357 literals no longer default to `f64`. Literals must be suffixed with an
9358 appropriate type if inference cannot determine the type of the
9360 * The Box<T> type is no longer implicitly borrowed to &mut T.
9361 * Procedures are now required to not capture borrowed references.
9364 * The standard library is now a "facade" over a number of underlying
9365 libraries. This means that development on the standard library should
9366 be speedier due to smaller crates, as well as a clearer line between
9368 * A new library, libcore, lives under the standard library's facade
9369 which is Rust's "0-assumption" library, suitable for embedded and
9370 kernel development for example.
9371 * A regex crate has been added to the standard distribution. This crate
9372 includes statically compiled regular expressions.
9373 * The unwrap/unwrap_err methods on Result require a Show bound for
9374 better error messages.
9375 * The return types of the std::comm primitives have been centralized
9376 around the Result type.
9377 * A number of I/O primitives have gained the ability to time out their
9379 * A number of I/O primitives have gained the ability to close their
9380 reading/writing halves to cancel pending operations.
9381 * Reverse iterator methods have been removed in favor of `rev()` on
9382 their forward-iteration counterparts.
9383 * A bitflags! macro has been added to enable easy interop with C and
9384 management of bit flags.
9385 * A debug_assert! macro is now provided which is disabled when
9386 `--cfg ndebug` is passed to the compiler.
9387 * A graphviz crate has been added for creating .dot files.
9388 * The std::cast module has been migrated into std::mem.
9389 * The std::local_data api has been migrated from freestanding functions
9390 to being based on methods.
9391 * The Pod trait has been renamed to Copy.
9392 * jemalloc has been added as the default allocator for types.
9393 * The API for allocating memory has been changed to use proper alignment
9394 and sized deallocation
9395 * Connecting a TcpStream or binding a TcpListener is now based on a
9396 string address and a u16 port. This allows connecting to a hostname as
9398 * The Reader trait now contains a core method, read_at_least(), which
9399 correctly handles many repeated 0-length reads.
9400 * The process-spawning API is now centered around a builder-style
9402 * The :? printing qualifier has been moved from the standard library to
9403 an external libdebug crate.
9404 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9405 have been renamed to Eq/Ord.
9406 * The select/plural methods have been removed from format!. The escapes
9407 for { and } have also changed from \{ and \} to {{ and }},
9409 * The TaskBuilder API has been re-worked to be a true builder, and
9410 extension traits for spawning native/green tasks have been added.
9413 * All breaking changes to the language or libraries now have their
9414 commit message annotated with `[breaking-change]` to allow for easy
9415 discovery of breaking changes.
9416 * The compiler will now try to suggest how to annotate lifetimes if a
9417 lifetime-related error occurs.
9418 * Debug info continues to be improved greatly with general bug fixes and
9419 better support for situations like link time optimization (LTO).
9420 * Usage of syntax extensions when cross-compiling has been fixed.
9421 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9422 -fdata-sections and --gc-sections has been enabled by default
9423 * The compiler is now stricter about where it will load module files
9424 from when a module is declared via `mod foo;`.
9425 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9426 Syntax extensions are now discovered via a "plugin registrar" type
9427 which will be extended in the future to other various plugins.
9428 * Lints have been restructured to allow for dynamically loadable lints.
9429 * A number of rustdoc improvements:
9430 * The HTML output has been visually redesigned.
9431 * Markdown is now powered by hoedown instead of sundown.
9432 * Searching heuristics have been greatly improved.
9433 * The search index has been reduced in size by a great amount.
9434 * Cross-crate documentation via `pub use` has been greatly improved.
9435 * Primitive types are now hyperlinked and documented.
9436 * Documentation has been moved from static.rust-lang.org/doc to
9438 * A new sandbox, play.rust-lang.org, is available for running and
9439 sharing rust code examples on-line.
9440 * Unused attributes are now more robustly warned about.
9441 * The dead_code lint now warns about unused struct fields.
9442 * Cross-compiling to iOS is now supported.
9443 * Cross-compiling to mipsel is now supported.
9444 * Stability attributes are now inherited by default and no longer apply
9445 to intra-crate usage, only inter-crate usage.
9446 * Error message related to non-exhaustive match expressions have been
9450 Version 0.10 (2014-04-03)
9451 =========================
9453 * ~1500 changes, numerous bugfixes
9456 * A new RFC process is now in place for modifying the language.
9457 * Patterns with `@`-pointers have been removed from the language.
9458 * Patterns with unique vectors (`~[T]`) have been removed from the
9460 * Patterns with unique strings (`~str`) have been removed from the
9462 * `@str` has been removed from the language.
9463 * `@[T]` has been removed from the language.
9464 * `@self` has been removed from the language.
9465 * `@Trait` has been removed from the language.
9466 * Headers on `~` allocations which contain `@` boxes inside the type for
9467 reference counting have been removed.
9468 * The semantics around the lifetimes of temporary expressions have changed,
9469 see #3511 and #11585 for more information.
9470 * Cross-crate syntax extensions are now possible, but feature gated. See
9471 #11151 for more information. This includes both `macro_rules!` macros as
9472 well as syntax extensions such as `format!`.
9473 * New lint modes have been added, and older ones have been turned on to be
9475 * Unnecessary parentheses
9478 * Uppercase variables
9479 * Publicly visible private types
9480 * `#[deriving]` with raw pointers
9481 * Unsafe functions can no longer be coerced to closures.
9482 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9483 * The `#[simd]` attribute is now behind a feature gate.
9484 * Visibility is no longer allowed on `extern crate` statements, and
9485 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9486 * Trailing commas are now allowed in argument lists and tuple patterns.
9487 * The `do` keyword has been removed, it is now a reserved keyword.
9488 * Default type parameters have been implemented, but are feature gated.
9489 * Borrowed variables through captures in closures are now considered soundly.
9490 * `extern mod` is now `extern crate`
9491 * The `Freeze` trait has been removed.
9492 * The `Share` trait has been added for types that can be shared among
9494 * Labels in macros are now hygienic.
9495 * Expression/statement macro invocations can be delimited with `{}` now.
9496 * Treatment of types allowed in `static mut` locations has been tweaked.
9497 * The `*` and `.` operators are now overloadable through the `Deref` and
9499 * `~Trait` and `proc` no longer have `Send` bounds by default.
9500 * Partial type hints are now supported with the `_` type marker.
9501 * An `Unsafe` type was introduced for interior mutability. It is now
9502 considered undefined to transmute from `&T` to `&mut T` without using the
9504 * The #[linkage] attribute was implemented for extern statics/functions.
9505 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9506 * `Pod` was renamed to `Copy`.
9509 * The `libextra` library has been removed. It has now been decomposed into
9510 component libraries with smaller and more focused nuggets of
9511 functionality. The full list of libraries can be found on the
9512 documentation index page.
9513 * std: `std::condition` has been removed. All I/O errors are now propagated
9514 through the `Result` type. In order to assist with error handling, a
9515 `try!` macro for unwrapping errors with an early return and a lint for
9516 unused results has been added. See #12039 for more information.
9517 * std: The `vec` module has been renamed to `slice`.
9518 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9519 This will become the only growable vector in the future.
9520 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9521 are now found at `std::io::BufferedReader` instead of
9522 `std::io::buffered::BufferedReader`.
9523 * std: `print` and `println` are no longer in the prelude, the `print!` and
9524 `println!` macros are intended to be used instead.
9525 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9526 attempts to statically prevent cycles.
9527 * std: The standard distribution is adopting the policy of pushing failure
9528 to the user rather than failing in libraries. Many functions (such as
9529 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9530 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9531 deriving mode: `#[deriving(Show)]`.
9532 * std: `ToStr` is now implemented for all types implementing `Show`.
9533 * std: The formatting trait methods now take `&self` instead of `&T`
9534 * std: The `invert()` method on iterators has been renamed to `rev()`
9535 * std: `std::num` has seen a reduction in the genericity of its traits,
9536 consolidating functionality into a few core traits.
9537 * std: Backtraces are now printed on task failure if the environment
9538 variable `RUST_BACKTRACE` is present.
9539 * std: Naming conventions for iterators have been standardized. More details
9540 can be found on the wiki's style guide.
9541 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9542 still implement the function.
9543 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9544 * std: `assert_approx_eq!` has been removed
9545 * std: The `e` and `E` formatting specifiers for floats have been added to
9546 print them in exponential notation.
9547 * std: The `Times` trait has been removed
9548 * std: Indications of variance and opting out of builtin bounds is done
9549 through marker types in `std::kinds::marker` now
9550 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9551 `#[deriving(Hash)]` is now possible.
9552 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9553 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9554 * std: `Chan::new` is now `channel()`.
9555 * std: A new synchronous channel type has been implemented.
9556 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9557 * std: `hashmap` and `trie` have been moved to `libcollections`
9558 * std: `run` has been rolled into `io::process`
9559 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9560 * std: The equality and comparison traits have seen some reorganization.
9561 * std: `rand` has moved to `librand`.
9562 * std: `to_{lower,upper}case` has been implemented for `char`.
9563 * std: Logging has been moved to `liblog`.
9564 * collections: `HashMap` has been rewritten for higher performance and less
9566 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9567 it can be booted manually. The runtime guide has more information and
9569 * native: All I/O functionality except signals has been implemented.
9570 * green: Task spawning with `libgreen` has been optimized with stack caching
9571 and various trimming of code.
9572 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9573 * sync: The `extra::sync` module has been updated to modern rust (and moved
9574 to the `sync` library), tweaking and improving various interfaces while
9575 dropping redundant functionality.
9576 * sync: A new `Barrier` type has been added to the `sync` library.
9577 * sync: An efficient mutex for native and green tasks has been implemented.
9578 * serialize: The `base64` module has seen some improvement. It treats
9579 newlines better, has non-string error values, and has seen general
9581 * fourcc: A `fourcc!` macro was introduced
9582 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9583 hexadecimal literal.
9586 * `rustpkg` has been deprecated and removed from the main repository. Its
9587 replacement, `cargo`, is under development.
9588 * Nightly builds of rust are now available
9589 * The memory usage of rustc has been improved many times throughout this
9591 * The build process supports disabling rpath support for the rustc binary
9593 * Code generation has improved in some cases, giving more information to the
9594 LLVM optimization passes to enable more extensive optimizations.
9595 * Debuginfo compatibility with lldb on OSX has been restored.
9596 * The master branch is now gated on an android bot, making building for
9597 android much more reliable.
9598 * Output flags have been centralized into one `--emit` flag.
9599 * Crate type flags have been centralized into one `--crate-type` flag.
9600 * Codegen flags have been consolidated behind a `-C` flag.
9601 * Linking against outdated crates now has improved error messages.
9602 * Error messages with lifetimes will often suggest how to annotate the
9603 function to fix the error.
9604 * Many more types are documented in the standard library, and new guides
9606 * Many `rustdoc` improvements:
9607 * code blocks are syntax highlighted.
9608 * render standalone markdown files.
9609 * the --test flag tests all code blocks by default.
9610 * exported macros are displayed.
9611 * re-exported types have their documentation inlined at the location of the
9613 * search works across crates that have been rendered to the same output
9617 Version 0.9 (2014-01-09)
9618 ==========================
9620 * ~1800 changes, numerous bugfixes
9623 * The `float` type has been removed. Use `f32` or `f64` instead.
9624 * A new facility for enabling experimental features (feature gating) has
9625 been added, using the crate-level `#[feature(foo)]` attribute.
9626 * Managed boxes (@) are now behind a feature gate
9627 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9628 standard library's `Gc` or `Rc` types instead.
9629 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9630 * Jumping back to the top of a loop is now done with `continue` instead of
9632 * Strings can no longer be mutated through index assignment.
9633 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9634 hash delimiters, as in `r###"foo"###`.
9635 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9637 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9638 * `@fn`s have been removed.
9639 * `do` only works with procs in order to make it obvious what the cost
9641 * Single-element tuple-like structs can no longer be dereferenced to
9642 obtain the inner value. A more comprehensive solution for overloading
9643 the dereference operator will be provided in the future.
9644 * The `#[link(...)]` attribute has been replaced with
9645 `#[crate_id = "name#vers"]`.
9646 * Empty `impl`s must be terminated with empty braces and may not be
9647 terminated with a semicolon.
9648 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9649 no longer has any special meaning.
9650 * The old `fmt!` string formatting macro has been removed.
9651 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9652 `print!` and `println!`.
9653 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9654 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9655 `extern mod foo = "bar"` instead.
9656 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9657 * Macros can have attributes.
9658 * Macros can expand to items with attributes.
9659 * Macros can expand to multiple items.
9660 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9661 * Comments may be nested.
9662 * Values automatically coerce to trait objects they implement, without
9664 * Enum discriminants are no longer an entire word but as small as needed to
9665 contain all the variants. The `repr` attribute can be used to override
9666 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9667 `#[repr(C)]` to match C enums.
9668 * Non-string literals are not allowed in attributes (they never worked).
9669 * The FFI now supports variadic functions.
9670 * Octal numeric literals, as in `0o7777`.
9671 * The `concat!` syntax extension performs compile-time string concatenation.
9672 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9673 removed as Rust no longer uses segmented stacks.
9674 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9675 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9676 not `*`; ignoring remaining fields of a struct is also done with `..`,
9677 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9678 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9679 * `rustc` supports the "system" calling convention, which defaults to the
9680 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9682 * The `type_overflow` lint (default: warn) checks literals for overflow.
9683 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9684 * The `attribute_usage` lint (default: warn) warns about unknown
9686 * The `unknown_features` lint (default: warn) warns about unknown
9688 * The `dead_code` lint (default: warn) checks for dead code.
9689 * Rust libraries can be linked statically to one another
9690 * `#[link_args]` is behind the `link_args` feature gate.
9691 * Native libraries are now linked with `#[link(name = "foo")]`
9692 * Native libraries can be statically linked to a rust crate
9693 (`#[link(name = "foo", kind = "static")]`).
9694 * Native OS X frameworks are now officially supported
9695 (`#[link(name = "foo", kind = "framework")]`).
9696 * The `#[thread_local]` attribute creates thread-local (not task-local)
9697 variables. Currently behind the `thread_local` feature gate.
9698 * The `return` keyword may be used in closures.
9699 * Types that can be copied via a memcpy implement the `Pod` kind.
9700 * The `cfg` attribute can now be used on struct fields and enum variants.
9703 * std: The `option` and `result` API's have been overhauled to make them
9704 simpler, more consistent, and more composable.
9705 * std: The entire `std::io` module has been replaced with one that is
9706 more comprehensive and that properly interfaces with the underlying
9707 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9709 * std: `io::util` contains a number of useful implementations of
9710 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9711 `ZeroReader`, `TeeReader`.
9712 * std: The reference counted pointer type `extra::rc` moved into std.
9713 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9714 just a wrapper around it).
9715 * std: The `Either` type has been removed.
9716 * std: `fmt::Default` can be implemented for any type to provide default
9717 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9718 * std: The `rand` API continues to be tweaked.
9719 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9720 on failure in gdb, is now named `rust_fail`.
9721 * std: The `each_key` and `each_value` methods on `HashMap` have been
9722 replaced by the `keys` and `values` iterators.
9723 * std: Functions dealing with type size and alignment have moved from the
9724 `sys` module to the `mem` module.
9725 * std: The `path` module was written and API changed.
9726 * std: `str::from_utf8` has been changed to cast instead of allocate.
9727 * std: `starts_with` and `ends_with` methods added to vectors via the
9728 `ImmutableEqVector` trait, which is in the prelude.
9729 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9730 if the index is out of bounds.
9731 * std: Task failure no longer propagates between tasks, as the model was
9732 complex, expensive, and incompatible with thread-based tasks.
9733 * std: The `Any` type can be used for dynamic typing.
9734 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9736 * std: Methods that produce iterators generally do not have an `_iter`
9738 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9739 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9740 * std: `util::ignore` renamed to `prelude::drop`.
9741 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9743 * std: `vec::raw` has seen a lot of cleanup and API changes.
9744 * std: The standard library no longer includes any C++ code, and very
9745 minimal C, eliminating the dependency on libstdc++.
9746 * std: Runtime scheduling and I/O functionality has been factored out into
9747 extensible interfaces and is now implemented by two different crates:
9748 libnative, for native threading and I/O; and libgreen, for green threading
9749 and I/O. This paves the way for using the standard library in more limited
9750 embedded environments.
9751 * std: The `comm` module has been rewritten to be much faster, have a
9752 simpler, more consistent API, and to work for both native and green
9754 * std: All libuv dependencies have been moved into the rustuv crate.
9755 * native: New implementations of runtime scheduling on top of OS threads.
9756 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9758 * green: The green thread scheduler and message passing types are almost
9760 * extra: The `flatpipes` module had bitrotted and was removed.
9761 * extra: All crypto functions have been removed and Rust now has a policy of
9762 not reimplementing crypto in the standard library. In the future crypto
9763 will be provided by external crates with bindings to established libraries.
9764 * extra: `c_vec` has been modernized.
9765 * extra: The `sort` module has been removed. Use the `sort` method on
9769 * The `rust` and `rusti` commands have been removed, due to lack of
9771 * `rustdoc` was completely rewritten.
9772 * `rustdoc` can test code examples in documentation.
9773 * `rustpkg` can test packages with the argument, 'test'.
9774 * `rustpkg` supports arbitrary dependencies, including C libraries.
9775 * `rustc`'s support for generating debug info is improved again.
9776 * `rustc` has better error reporting for unbalanced delimiters.
9777 * `rustc`'s JIT support was removed due to bitrot.
9778 * Executables and static libraries can be built with LTO (-Z lto)
9779 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9783 Version 0.8 (2013-09-26)
9784 ============================
9786 * ~2200 changes, numerous bugfixes
9789 * The `for` loop syntax has changed to work with the `Iterator` trait.
9790 * At long last, unwinding works on Windows.
9791 * Default methods are ready for use.
9792 * Many trait inheritance bugs fixed.
9793 * Owned and borrowed trait objects work more reliably.
9794 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9795 * rustc can omit emission of code for the `debug!` macro if it is passed
9797 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9798 for foo.rs, then foo/mod.rs, and will generate an error when both are
9800 * Strings no longer contain trailing nulls. The new `std::c_str` module
9801 provides new mechanisms for converting to C strings.
9802 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9803 * The FFI has been overhauled such that foreign functions are called directly,
9804 instead of through a stack-switching wrapper.
9805 * Calling a foreign function must be done through a Rust function with the
9806 `#[fixed_stack_segment]` attribute.
9807 * The `externfn!` macro can be used to declare both a foreign function and
9808 a `#[fixed_stack_segment]` wrapper at once.
9809 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9810 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9811 * `priv` is disallowed everywhere except for struct fields and enum variants.
9812 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9813 * `ref` bindings in irrefutable patterns work correctly now.
9814 * `char` is now prevented from containing invalid code points.
9815 * Casting to `bool` is no longer allowed.
9816 * `\0` is now accepted as an escape in chars and strings.
9817 * `yield` is a reserved keyword.
9818 * `typeof` is a reserved keyword.
9819 * Crates may be imported by URL with `extern mod foo = "url";`.
9820 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9821 * Static vectors can be initialized with repeating elements,
9822 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9823 * Static structs can be initialized with functional record update,
9824 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9825 * `cfg!` can be used to conditionally execute code based on the crate
9826 configuration, similarly to `#[cfg(...)]`.
9827 * The `unnecessary_qualification` lint detects unneeded module
9828 prefixes (default: allow).
9829 * Arithmetic operations have been implemented on the SIMD types in
9830 `std::unstable::simd`.
9831 * Exchange allocation headers were removed, reducing memory usage.
9832 * `format!` implements a completely new, extensible, and higher-performance
9833 string formatting system. It will replace `fmt!`.
9834 * `print!` and `println!` write formatted strings (using the `format!`
9835 extension) to stdout.
9836 * `write!` and `writeln!` write formatted strings (using the `format!`
9837 extension) to the new Writers in `std::rt::io`.
9838 * The library section in which a function or static is placed may
9839 be specified with `#[link_section = "..."]`.
9840 * The `proto!` syntax extension for defining bounded message protocols
9842 * `macro_rules!` is hygienic for `let` declarations.
9843 * The `#[export_name]` attribute specifies the name of a symbol.
9844 * `unreachable!` can be used to indicate unreachable code, and fails
9848 * std: Transitioned to the new runtime, written in Rust.
9849 * std: Added an experimental I/O library, `rt::io`, based on the new
9851 * std: A new generic `range` function was added to the prelude, replacing
9852 `uint::range` and friends.
9853 * std: `range_rev` no longer exists. Since range is an iterator it can be
9854 reversed with `range(lo, hi).invert()`.
9855 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9856 renamed to `unwrap_or`.
9857 * std: The `iterator` module was renamed to `iter`.
9858 * std: Integral types now support the `checked_add`, `checked_sub`, and
9859 `checked_mul` operations for detecting overflow.
9860 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9862 * std: Methods are standardizing on conventions for casting methods:
9863 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9865 * std: The `CString` type in `c_str` provides new ways to convert to and
9867 * std: `DoubleEndedIterator` can yield elements in two directions.
9868 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9870 * std: `str::from_bytes` renamed to `str::from_utf8`.
9871 * std: `pop_opt` and `shift_opt` methods added to vectors.
9872 * std: The task-local data interface no longer uses @, and keys are
9873 no longer function pointers.
9874 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9875 * std: Added `SharedPort` to `comm`.
9876 * std: `Eq` has a default method for `ne`; only `eq` is required
9878 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9879 is required in implementations.
9880 * std: `is_utf8` performance is improved, impacting many string functions.
9881 * std: `os::MemoryMap` provides cross-platform mmap.
9882 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9883 are not 'in-bounds' are considered undefined.
9884 * std: Many freestanding functions in `vec` removed in favor of methods.
9885 * std: Many freestanding functions on scalar types removed in favor of
9887 * std: Many options to task builders were removed since they don't make
9888 sense in the new scheduler design.
9889 * std: More containers implement `FromIterator` so can be created by the
9891 * std: More complete atomic types in `unstable::atomics`.
9892 * std: `comm::PortSet` removed.
9893 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9894 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9895 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9896 default implementations.
9897 * std: Various `from_str` functions were removed in favor of a generic
9898 `from_str` which is available in the prelude.
9899 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9900 * extra: `dlist`, the doubly-linked list was modernized.
9901 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9902 * extra: Added `glob` module, replacing `std::os::glob`.
9903 * extra: `rope` was removed.
9904 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9905 * extra: `net`, and `timer` were removed. The experimental replacements
9906 are `std::rt::io::net` and `std::rt::io::timer`.
9907 * extra: Iterators implemented for `SmallIntMap`.
9908 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9909 * extra: `SmallIntSet` removed. Use `BitvSet`.
9910 * extra: Performance of JSON parsing greatly improved.
9911 * extra: `semver` updated to SemVer 2.0.0.
9912 * extra: `term` handles more terminals correctly.
9913 * extra: `dbg` module removed.
9914 * extra: `par` module removed.
9915 * extra: `future` was cleaned up, with some method renames.
9916 * extra: Most free functions in `getopts` were converted to methods.
9919 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9920 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9921 similarly to gcc's `--march` flag.
9922 * rustc's performance compiling small crates is much better.
9923 * rustpkg has received many improvements.
9924 * rustpkg supports git tags as package IDs.
9925 * rustpkg builds into target-specific directories so it can be used for
9927 * The number of concurrent test tasks is controlled by the environment
9928 variable RUST_TEST_TASKS.
9929 * The test harness can now report metrics for benchmarks.
9930 * All tools have man pages.
9931 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9932 * The runtime uses jemalloc for allocations.
9933 * Segmented stacks are temporarily disabled as part of the transition to
9934 the new runtime. Stack overflows are possible!
9935 * A new documentation backend, rustdoc_ng, is available for use. It is
9936 still invoked through the normal `rustdoc` command.
9939 Version 0.7 (2013-07-03)
9940 =======================
9942 * ~2000 changes, numerous bugfixes
9945 * `impl`s no longer accept a visibility qualifier. Put them on methods
9947 * The borrow checker has been rewritten with flow-sensitivity, fixing
9948 many bugs and inconveniences.
9949 * The `self` parameter no longer implicitly means `&'self self`,
9950 and can be explicitly marked with a lifetime.
9951 * Overloadable compound operators (`+=`, etc.) have been temporarily
9952 removed due to bugs.
9953 * The `for` loop protocol now requires `for`-iterators to return `bool`
9954 so they compose better.
9955 * The `Durable` trait is replaced with the `'static` bounds.
9956 * Trait default methods work more often.
9957 * Structs with the `#[packed]` attribute have byte alignment and
9958 no padding between fields.
9959 * Type parameters bound by `Copy` must now be copied explicitly with
9961 * It is now illegal to move out of a dereferenced unsafe pointer.
9962 * `Option<~T>` is now represented as a nullable pointer.
9963 * `@mut` does dynamic borrow checks correctly.
9964 * The `main` function is only detected at the topmost level of the crate.
9965 The `#[main]` attribute is still valid anywhere.
9966 * Struct fields may no longer be mutable. Use inherited mutability.
9967 * The `#[no_send]` attribute makes a type that would otherwise be
9969 * The `#[no_freeze]` attribute makes a type that would otherwise be
9971 * Unbounded recursion will abort the process after reaching the limit
9972 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9973 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9974 are never implicitly copyable.
9975 * `#[static_assert]` makes compile-time assertions about static bools.
9976 * At long last, 'argument modes' no longer exist.
9977 * The rarely used `use mod` statement no longer exists.
9980 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9982 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9983 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9985 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9986 and unsuffixed integer literals.
9989 * The `core` crate was renamed to `std`.
9990 * The `std` crate was renamed to `extra`.
9991 * More and improved documentation.
9992 * std: `iterator` module for external iterator objects.
9993 * Many old-style (internal, higher-order function) iterators replaced by
9994 implementations of `Iterator`.
9995 * std: Many old internal vector and string iterators,
9996 incl. `any`, `all`. removed.
9997 * std: The `finalize` method of `Drop` renamed to `drop`.
9998 * std: The `drop` method now takes `&mut self` instead of `&self`.
9999 * std: The prelude no longer re-exports any modules, only types and traits.
10000 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10001 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10002 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10003 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10004 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10005 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10006 * std: Many types implement `Clone`.
10007 * std: `path` type renamed to `Path`.
10008 * std: `mut` module and `Mut` type removed.
10009 * std: Many standalone functions removed in favor of methods and iterators
10010 in `vec`, `str`. In the future methods will also work as functions.
10011 * std: `reinterpret_cast` removed. Use `transmute`.
10012 * std: ascii string handling in `std::ascii`.
10013 * std: `Rand` is implemented for ~/@.
10014 * std: `run` module for spawning processes overhauled.
10015 * std: Various atomic types added to `unstable::atomic`.
10016 * std: Various types implement `Zero`.
10017 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10018 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10019 * std: Added `os::mkdir_recursive`.
10020 * std: Added `os::glob` function performs filesystems globs.
10021 * std: `FuzzyEq` renamed to `ApproxEq`.
10022 * std: `Map` now defines `pop` and `swap` methods.
10023 * std: `Cell` constructors converted to static methods.
10024 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10025 * extra: `flate` module moved from `std` to `extra`.
10026 * extra: `fileinput` module for iterating over a series of files.
10027 * extra: `Complex` number type and `complex` module.
10028 * extra: `Rational` number type and `rational` module.
10029 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10030 * extra: `term` uses terminfo now, is more correct.
10031 * extra: `arc` functions converted to methods.
10032 * extra: Implementation of fixed output size variations of SHA-2.
10035 * `unused_variables` lint mode for unused variables (default: warn).
10036 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10038 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10040 * `dead_assignment` lint mode for unread variables (default: warn).
10041 * `unnecessary_allocation` lint mode detects some heap allocations that are
10042 immediately borrowed so could be written without allocating (default: warn).
10043 * `missing_doc` lint mode (default: allow).
10044 * `unreachable_code` lint mode (default: warn).
10045 * The `rusti` command has been rewritten and a number of bugs addressed.
10046 * rustc outputs in color on more terminals.
10047 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10048 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10049 * Compiling with `-g` will make the binary record information about
10050 dynamic borrowcheck failures for debugging.
10051 * rustdoc has a nicer stylesheet.
10052 * Various improvements to rustdoc.
10053 * Improvements to rustpkg (see the detailed release notes).
10056 Version 0.6 (2013-04-03)
10057 ========================
10059 * ~2100 changes, numerous bugfixes
10062 * The self type parameter in traits is now spelled `Self`
10063 * The `self` parameter in trait and impl methods must now be explicitly
10064 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10065 * Static methods no longer require the `static` keyword and instead
10066 are distinguished by the lack of a `self` parameter
10067 * Replaced the `Durable` trait with the `'static` lifetime
10068 * The old closure type syntax with the trailing sigil has been
10069 removed in favor of the more consistent leading sigil
10070 * `super` is a keyword, and may be prefixed to paths
10071 * Trait bounds are separated with `+` instead of whitespace
10072 * Traits are implemented with `impl Trait for Type`
10073 instead of `impl Type: Trait`
10074 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10075 * The `export` keyword has finally been removed
10076 * The `move` keyword has been removed (see "Semantic changes")
10077 * The interior mutability qualifier on vectors, `[mut T]`, has been
10078 removed. Use `&mut [T]`, etc.
10079 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10080 * `fail` is no longer a keyword. Use `fail!()`
10081 * `assert` is no longer a keyword. Use `assert!()`
10082 * `log` is no longer a keyword. use `debug!`, etc.
10083 * 1-tuples may be represented as `(T,)`
10084 * Struct fields may no longer be `mut`. Use inherited mutability,
10085 `@mut T`, `core::mut` or `core::cell`
10086 * `extern mod { ... }` is no longer valid syntax for foreign
10087 function modules. Use extern blocks: `extern { ... }`
10088 * Newtype enums removed. Use tuple-structs.
10089 * Trait implementations no longer support visibility modifiers
10090 * Pattern matching over vectors improved and expanded
10091 * `const` renamed to `static` to correspond to lifetime name,
10092 and make room for future `static mut` unsafe mutable globals.
10093 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10094 * `Clone` implementations can be automatically generated with
10095 `#[deriving(Clone)]`
10096 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10097 instead of `foo as Bar`.
10098 * Fixed length vector types are now written as `[int, .. 3]`
10099 instead of `[int * 3]`.
10100 * Fixed length vector types can express the length as a constant
10101 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10104 * Types with owned pointers or custom destructors move by default,
10105 eliminating the `move` keyword
10106 * All foreign functions are considered unsafe
10107 * &mut is now unaliasable
10108 * Writes to borrowed @mut pointers are prevented dynamically
10110 * The name of the main function can be customized using #[main]
10111 * The default type of an inferred closure is &fn instead of @fn
10112 * `use` statements may no longer be "chained" - they cannot import
10113 identifiers imported by previous `use` statements
10114 * `use` statements are crate relative, importing from the "top"
10115 of the crate by default. Paths may be prefixed with `super::`
10116 or `self::` to change the search behavior.
10117 * Method visibility is inherited from the implementation declaration
10118 * Structural records have been removed
10119 * Many more types can be used in static items, including enums
10120 'static-lifetime pointers and vectors
10121 * Pattern matching over vectors improved and expanded
10122 * Typechecking of closure types has been overhauled to
10123 improve inference and eliminate unsoundness
10124 * Macros leave scope at the end of modules, unless that module is
10125 tagged with #[macro_escape]
10128 * Added big integers to `std::bigint`
10129 * Removed `core::oldcomm` module
10130 * Added pipe-based `core::comm` module
10131 * Numeric traits have been reorganized under `core::num`
10132 * `vec::slice` finally returns a slice
10133 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10134 * Containers reorganized around traits in `core::container`
10135 * `core::dvec` removed, `~[T]` is a drop-in replacement
10136 * `core::send_map` renamed to `core::hashmap`
10137 * `std::map` removed; replaced with `core::hashmap`
10138 * `std::treemap` reimplemented as an owned balanced tree
10139 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10140 * `core::trie` added as a fast ordered map for integer keys
10141 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10142 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10143 overload the comparison operators, whereas `TotalOrd` is used
10144 by certain container types
10147 * Replaced the 'cargo' package manager with 'rustpkg'
10148 * Added all-purpose 'rust' tool
10149 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10150 * rustc now *attempts* to offer spelling suggestions
10151 * Improved support for ARM and Android
10152 * Preliminary MIPS backend
10153 * Improved foreign function ABI implementation for x86, x86_64
10154 * Various memory usage improvements
10155 * Rust code may be embedded in foreign code under limited circumstances
10156 * Inline assembler supported by new asm!() syntax extension.
10159 Version 0.5 (2012-12-21)
10160 ===========================
10162 * ~900 changes, numerous bugfixes
10165 * Removed `<-` move operator
10166 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10167 * Removed old fixed length vector syntax - `[T]/N`
10168 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10169 * Macros may now expand to items and statements
10170 * `a.b()` is always parsed as a method call, never as a field projection
10171 * `Eq` and `IterBytes` implementations can be automatically generated
10172 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10173 * Removed the special crate language for `.rc` files
10174 * Function arguments may consist of any irrefutable pattern
10177 * `&` and `~` pointers may point to objects
10178 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10179 * Enum variants may be structs
10180 * Destructors can be added to all nominal types with the Drop trait
10181 * Structs and nullary enum variants may be constants
10182 * Values that cannot be implicitly copied are now automatically moved
10183 without writing `move` explicitly
10184 * `&T` may now be coerced to `*T`
10185 * Coercions happen in `let` statements as well as function calls
10186 * `use` statements now take crate-relative paths
10187 * The module and type namespaces have been merged so that static
10188 method names can be resolved under the trait in which they are
10191 * Improved support for language features
10192 * Trait inheritance works in many scenarios
10193 * More support for explicit self arguments in methods - `self`, `&self`
10194 `@self`, and `~self` all generally work as expected
10195 * Static methods work in more situations
10196 * Experimental: Traits may declare default methods for the implementations
10200 * New condition handling system in `core::condition`
10201 * Timsort added to `std::sort`
10202 * New priority queue, `std::priority_queue`
10203 * Pipes for serializable types, `std::flatpipes'
10204 * Serialization overhauled to be trait-based
10205 * Expanded `getopts` definitions
10206 * Moved futures to `std`
10207 * More functions are pure now
10208 * `core::comm` renamed to `oldcomm`. Still deprecated
10209 * `rustdoc` and `cargo` are libraries now
10212 * Added a preliminary REPL, `rusti`
10213 * License changed from MIT to dual MIT/APL2
10216 Version 0.4 (2012-10-15)
10217 ==========================
10219 * ~2000 changes, numerous bugfixes
10222 * All keywords are now strict and may not be used as identifiers anywhere
10223 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10224 'of', 'with', 'to', 'class'.
10225 * Classes are replaced with simpler structs
10226 * Explicit method self types
10227 * `ret` became `return` and `alt` became `match`
10228 * `import` is now `use`; `use is now `extern mod`
10229 * `extern mod { ... }` is now `extern { ... }`
10230 * `use mod` is the recommended way to import modules
10231 * `pub` and `priv` replace deprecated export lists
10232 * The syntax of `match` pattern arms now uses fat arrow (=>)
10233 * `main` no longer accepts an args vector; use `os::args` instead
10236 * Trait implementations are now coherent, ala Haskell typeclasses
10237 * Trait methods may be static
10238 * Argument modes are deprecated
10239 * Borrowed pointers are much more mature and recommended for use
10240 * Strings and vectors in the static region are stored in constant memory
10241 * Typestate was removed
10242 * Resolution rewritten to be more reliable
10243 * Support for 'dual-mode' data structures (freezing and thawing)
10246 * Most binary operators can now be overloaded via the traits in
10248 * `std::net::url` for representing URLs
10249 * Sendable hash maps in `core::send_map`
10250 * `core::task' gained a (currently unsafe) task-local storage API
10253 * An efficient new intertask communication primitive called the pipe,
10254 along with a number of higher-level channel types, in `core::pipes`
10255 * `std::arc`, an atomically reference counted, immutable, shared memory
10257 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10258 * Futures are now based on pipes and sendable
10259 * More robust linked task failure
10260 * Improved task builder API
10263 * Improved error reporting
10264 * Preliminary JIT support
10265 * Preliminary work on precise GC
10266 * Extensive architectural improvements to rustc
10267 * Begun a transition away from buggy C++-based reflection (shape) code to
10268 Rust-based (visitor) code
10269 * All hash functions and tables converted to secure, randomized SipHash
10272 Version 0.3 (2012-07-12)
10273 ========================
10275 * ~1900 changes, numerous bugfixes
10277 * New coding conveniences
10278 * Integer-literal suffix inference
10279 * Per-item control over warnings, errors
10280 * #[cfg(windows)] and #[cfg(unix)] attributes
10281 * Documentation comments
10282 * More compact closure syntax
10283 * 'do' expressions for treating higher-order functions as
10285 * *-patterns (wildcard extended to all constructor fields)
10288 * Name resolution pass and exhaustiveness checker rewritten
10289 * Region pointers and borrow checking supersede alias
10291 * Init-ness checking is now provided by a region-based liveness
10292 pass instead of the typestate pass; same for last-use analysis
10293 * Extensive work on region pointers
10295 * Experimental new language features
10296 * Slices and fixed-size, interior-allocated vectors
10297 * #!-comments for lang versioning, shell execution
10298 * Destructors and iface implementation for classes;
10299 type-parameterized classes and class methods
10300 * 'const' type kind for types that can be used to implement
10301 shared-memory concurrency patterns
10305 * Removal of various obsolete features
10306 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10307 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10309 * Constructs: do-while loops ('do' repurposed), fn binding,
10310 resources (replaced by destructors)
10312 * Compiler reorganization
10313 * Syntax-layer of compiler split into separate crate
10314 * Clang (from LLVM project) integrated into build
10315 * Typechecker split into sub-modules
10318 * New time functions
10319 * Extension methods for many built-in types
10320 * Arc: atomic-refcount read-only / exclusive-use shared cells
10321 * Par: parallel map and search routines
10322 * Extensive work on libuv interface
10323 * Much vector code moved to libraries
10324 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10325 #include, #include_str, #include_bin
10327 * Tool improvements
10328 * Cargo automatically resolves dependencies
10331 Version 0.2 (2012-03-29)
10332 =========================
10334 * >1500 changes, numerous bugfixes
10336 * New docs and doc tooling
10338 * New port: FreeBSD x86_64
10340 * Compilation model enhancements
10341 * Generics now specialized, multiply instantiated
10342 * Functions now inlined across separate crates
10344 * Scheduling, stack and threading fixes
10345 * Noticeably improved message-passing performance
10346 * Explicit schedulers
10350 * Experimental new language features
10351 * Operator overloading
10355 * Various language extensions
10356 * C-callback function types: 'crust fn ...'
10357 * Infinite-loop construct: 'loop { ... }'
10358 * Shorten 'mutable' to 'mut'
10359 * Required mutable-local qualifier: 'let mut ...'
10360 * Basic glob-exporting: 'export foo::*;'
10361 * Alt now exhaustive, 'alt check' for runtime-checked
10362 * Block-function form of 'for' loop, with 'break' and 'ret'.
10365 * AST quasi-quote syntax extension
10366 * Revived libuv interface
10367 * New modules: core::{future, iter}, std::arena
10368 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10369 * Extensive cleanup, regularization in libstd, libcore
10372 Version 0.1 (2012-01-20)
10373 ===============================
10375 * Most language features work, including:
10376 * Unique pointers, unique closures, move semantics
10377 * Interface-constrained generics
10378 * Static interface dispatch
10380 * Multithread task scheduling
10381 * Typestate predicates
10382 * Failure unwinding, destructors
10383 * Pattern matching and destructuring assignment
10384 * Lightweight block-lambda syntax
10385 * Preliminary macro-by-example
10387 * Compiler works with the following configurations:
10388 * Linux: x86 and x86_64 hosts and targets
10389 * macOS: x86 and x86_64 hosts and targets
10390 * Windows: x86 hosts and targets
10392 * Cross compilation / multi-target configuration supported.
10394 * Preliminary API-documentation and package-management tools included.
10398 * Documentation is incomplete.
10400 * Performance is below intended target.
10402 * Standard library APIs are subject to extensive change, reorganization.
10404 * Language-level versioning is not yet operational - future code will
10405 break unexpectedly.