1 Rust 1.56.0 (2021-10-21)
2 ========================
7 - [The 2021 Edition is now stable.][rust#88100]
8 See [the edition guide][rust-2021-edition-guide] for more details.
9 - [You can now specify explicit discriminant values on any Rust enum.][rust#86860]
10 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
11 - [Union field access is permitted in `const fn`.][rust#85769]
13 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
18 - [Upgrade to LLVM 13.][rust#87570]
19 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
20 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
21 - [Warnings can be forced on with `--force-warn`.][rust#87472]
22 This feature is primarily intended for usage by `cargo fix`, rather than end users.
23 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
24 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
26 \* Refer to Rust's [platform support page][platform-support-doc] for more
27 information on Rust's tiered platform support.
32 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
33 The Windows console still requires valid Unicode, but this change allows
34 splitting a UTF-8 character across multiple write calls. This allows, for
35 instance, programs that just read and write data buffers (e.g. copying a file
36 to stdout) without regard for Unicode or character boundaries.
37 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
38 For this use case, atomics scale much better under contention.
39 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
40 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
41 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
42 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
43 - [Treat invalid environment variable names as non-existent.][rust#86183]
44 Previously, the environment functions would panic if given a variable name
45 with an internal null character or equal sign (`=`). Now, these functions will
46 just treat such names as non-existent variables, since the OS cannot represent
47 the existence of a variable with such a name.
52 - [`std::os::unix::fs::chroot`]
53 - [`Iterator::intersperse`]
54 - [`Iterator::intersperse_with`]
55 - [`UnsafeCell::raw_get`]
56 - [`BufWriter::into_parts`]
57 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
58 These APIs were previously stable in `std`, but are now also available in `core`.
60 - [`String::shrink_to`]
61 - [`OsString::shrink_to`]
62 - [`PathBuf::shrink_to`]
63 - [`BinaryHeap::shrink_to`]
64 - [`VecDeque::shrink_to`]
65 - [`HashMap::shrink_to`]
66 - [`HashSet::shrink_to`]
69 These APIs are now usable in const contexts:
71 - [`std::mem::transmute`]
72 - [`[T]::first`][`slice::first`]
73 - [`[T]::split_first`][`slice::split_first`]
74 - [`[T]::last`][`slice::last`]
75 - [`[T]::split_last`][`slice::split_last`]
80 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
81 This has no effect at present on dependency version selection.
82 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
83 that support Rust code to include a crate's specified minimum version in the text matrix for that
89 - [Update to new argument parsing rules on Windows.][rust#87580]
90 This adjusts Rust's standard library to match the behavior of the standard
91 libraries for C/C++. The rules have changed slightly over time, and this PR
92 brings us to the latest set of rules (changed in 2008).
93 - [Disallow the aapcs calling convention on aarch64][rust#88399]
94 This was already not supported by LLVM; this change surfaces this lack of
95 support with a better error message.
96 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
97 - [Warn when an escaped newline skips multiple lines.][rust#87671]
98 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
99 may return different values on glibc <= 2.24.][rust#81825]
100 Rust now invokes the `clone3` system call directly, when available, to use new functionality
101 available via that system call. Older versions of glibc cache the result of `getpid`, and only
102 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
103 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
107 These changes provide no direct user facing benefits, but represent significant
108 improvements to the internals and overall performance of rustc
111 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
112 This improves the performance of most Rust builds.
113 - [Unify representation of macros in internal data structures.][rust#88019]
114 This change fixes a host of bugs with the handling of macros by the compiler,
117 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
118 [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
119 [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
120 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
121 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
122 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
123 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
124 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
125 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
126 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
127 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
128 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
129 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
130 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
131 [`task::ready!`]: https://doc.rust-lang.org/stable/std/task/macro.ready.html
132 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
133 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
134 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
135 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
136 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
137 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
138 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
139 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
140 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
141 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
142 [rust#86860]: https://github.com/rust-lang/rust/pull/86860
143 [rust#84039]: https://github.com/rust-lang/rust/pull/84039
144 [rust#86492]: https://github.com/rust-lang/rust/pull/86492
145 [rust#88363]: https://github.com/rust-lang/rust/pull/88363
146 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
147 [rust#87832]: https://github.com/rust-lang/rust/pull/87832
148 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
149 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
150 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
151 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
152 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
153 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
154 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
155 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
156 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
157 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
158 [rust#88177]: https://github.com/rust-lang/rust/pull/88177
159 [rust#88548]: https://github.com/rust-lang/rust/pull/88548
160 [rust#88551]: https://github.com/rust-lang/rust/pull/88551
161 [rust#88299]: https://github.com/rust-lang/rust/pull/88299
162 [rust#88220]: https://github.com/rust-lang/rust/pull/88220
163 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
164 [rust#86879]: https://github.com/rust-lang/rust/pull/86879
165 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
166 [rust#84662]: https://github.com/rust-lang/rust/pull/84662
167 [rust#86593]: https://github.com/rust-lang/rust/pull/86593
168 [rust#81050]: https://github.com/rust-lang/rust/pull/81050
169 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
170 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
171 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
172 [rust#88490]: https://github.com/rust-lang/rust/pull/88490
173 [rust#88269]: https://github.com/rust-lang/rust/pull/88269
174 [rust#84176]: https://github.com/rust-lang/rust/pull/84176
175 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
176 [rust#88227]: https://github.com/rust-lang/rust/pull/88227
177 [rust#88200]: https://github.com/rust-lang/rust/pull/88200
178 [rust#82776]: https://github.com/rust-lang/rust/pull/82776
179 [rust#88077]: https://github.com/rust-lang/rust/pull/88077
180 [rust#87728]: https://github.com/rust-lang/rust/pull/87728
181 [rust#87050]: https://github.com/rust-lang/rust/pull/87050
182 [rust#87619]: https://github.com/rust-lang/rust/pull/87619
183 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
184 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
186 Version 1.55.0 (2021-09-09)
187 ============================
191 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
192 will end at the maximum value of the integer.][83918]
193 - [You can now explicitly import the prelude of different editions
194 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
198 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
200 \* Refer to Rust's [platform support page][platform-support-doc] for more
201 information on Rust's tiered platform support.
206 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
207 These improvements should in general provide faster string parsing of floats,
208 no longer reject certain valid floating point values, and reduce
209 the produced code size for non-stripped artifacts.
210 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
217 - [`IntoInnerError::into_error`]
218 - [`IntoInnerError::into_parts`]
219 - [`MaybeUninit::assume_init_mut`]
220 - [`MaybeUninit::assume_init_ref`]
221 - [`MaybeUninit::write`]
223 - [`ops::ControlFlow`]
225 - [`x86::_bittestandcomplement`]
226 - [`x86::_bittestandreset`]
227 - [`x86::_bittestandset`]
228 - [`x86_64::_bittest64`]
229 - [`x86_64::_bittestandcomplement64`]
230 - [`x86_64::_bittestandreset64`]
231 - [`x86_64::_bittestandset64`]
233 The following previously stable functions are now `const`.
235 - [`str::from_utf8_unchecked`]
240 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
241 rustc in parallel such as when using `cargo test`.][cargo/9675]
242 - [The package definition in `cargo metadata` now includes the `"default_run"`
243 field from the manifest.][cargo/9550]
244 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
245 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
246 of packages.][cargo/9663]
250 - [Added "Go to item on exact match" search option.][85876]
251 - [The "Implementors" section on traits no longer shows redundant
252 method definitions.][85970]
253 - [Trait implementations are toggled open by default.][86260] This should make the
254 implementations more searchable by tools like `CTRL+F` in your browser.
255 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
256 through type aliases.][86334]
257 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
258 "Trait Implementations" section.][86513]
263 - [std functions that return an `io::Error` will no longer use the
264 `ErrorKind::Other` variant.][85746] This is to better reflect that these
265 kinds of errors could be categorised [into newer more specific `ErrorKind`
266 variants][79965], and that they do not represent a user error.
267 - [Using environment variable names with `process::Command` on Windows now
268 behaves as expected.][85270] Previously using envionment variables with
269 `Command` would cause them to be ASCII-uppercased.
270 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
271 with `rustdoc::`][86849]
273 [86849]: https://github.com/rust-lang/rust/pull/86849
274 [86513]: https://github.com/rust-lang/rust/pull/86513
275 [86334]: https://github.com/rust-lang/rust/pull/86334
276 [86260]: https://github.com/rust-lang/rust/pull/86260
277 [85970]: https://github.com/rust-lang/rust/pull/85970
278 [85876]: https://github.com/rust-lang/rust/pull/85876
279 [83572]: https://github.com/rust-lang/rust/pull/83572
280 [86294]: https://github.com/rust-lang/rust/pull/86294
281 [86858]: https://github.com/rust-lang/rust/pull/86858
282 [86761]: https://github.com/rust-lang/rust/pull/86761
283 [85769]: https://github.com/rust-lang/rust/pull/85769
284 [85746]: https://github.com/rust-lang/rust/pull/85746
285 [85305]: https://github.com/rust-lang/rust/pull/85305
286 [85270]: https://github.com/rust-lang/rust/pull/85270
287 [84111]: https://github.com/rust-lang/rust/pull/84111
288 [83918]: https://github.com/rust-lang/rust/pull/83918
289 [79965]: https://github.com/rust-lang/rust/pull/79965
290 [87370]: https://github.com/rust-lang/rust/pull/87370
291 [87298]: https://github.com/rust-lang/rust/pull/87298
292 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
293 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
294 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
295 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
296 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
297 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
298 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
299 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
300 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
301 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
302 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
303 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
304 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
305 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
306 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
307 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
308 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
309 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
310 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
311 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
312 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
313 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
314 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
315 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
318 Version 1.54.0 (2021-07-29)
319 ============================
322 -----------------------
324 - [You can now use macros for values in some built-in attributes.][83366]
325 This primarily allows you to call macros within the `#[doc]` attribute. For
326 example, to include external documentation in your crate, you can now write
329 #![doc = include_str!("README.md")]
332 - [You can now cast between unsized slice types (and types which contain
333 unsized slices) in `const fn`.][85078]
334 - [You can now use multiple generic lifetimes with `impl Trait` where the
335 lifetimes don't explicitly outlive another.][84701] In code this means
336 that you can now have `impl Trait<'a, 'b>` where as before you could
337 only have `impl Trait<'a, 'b> where 'b: 'a`.
340 -----------------------
342 - [Rustc will now search for custom JSON targets in
343 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
344 directory.][83800] You can find your sysroot directory by running
345 `rustc --print sysroot`.
346 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
347 - [You can now use `#[target_feature]` on safe functions when targeting
348 WebAssembly platforms.][84988]
349 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
350 - [Added tier 3\* support for `bpfel-unknown-none`
351 and `bpfeb-unknown-none`.][79608]
352 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
354 \* Refer to Rust's [platform support page][platform-support-doc] for more
355 information on Rust's tiered platform support.
358 -----------------------
360 - [`panic::panic_any` will now `#[track_caller]`.][85745]
361 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
362 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
363 - [The implementations of vendor intrinsics in core::arch have been
364 significantly refactored.][83278] The main user-visible changes are
365 a 50% reduction in the size of libcore.rlib and stricter validation
366 of constant operands passed to intrinsics. The latter is technically
367 a breaking change, but allows Rust to more closely match the C vendor
373 - [`BTreeMap::into_keys`]
374 - [`BTreeMap::into_values`]
375 - [`HashMap::into_keys`]
376 - [`HashMap::into_values`]
378 - [`VecDeque::binary_search`]
379 - [`VecDeque::binary_search_by`]
380 - [`VecDeque::binary_search_by_key`]
381 - [`VecDeque::partition_point`]
386 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
387 the dependency graph.][cargo/9520]
388 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
389 in the tree ][cargo/9499]
390 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
391 macro dependencies.][cargo/9488]
392 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
393 This variable points to a directory that integration tests and benches
394 can use as a "scratchpad" for testing filesystem operations.
398 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
399 - [Previously unsound code is no longer permitted where different constructors in branches
400 could require different lifetimes.][85574]
401 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
402 than before and may reject some previously accepted code.
403 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
404 when compiled with `codegen-units = 1`.][86063]
406 [85574]: https://github.com/rust-lang/rust/issues/85574
407 [86831]: https://github.com/rust-lang/rust/issues/86831
408 [86063]: https://github.com/rust-lang/rust/issues/86063
409 [86831]: https://github.com/rust-lang/rust/issues/86831
410 [79608]: https://github.com/rust-lang/rust/pull/79608
411 [84988]: https://github.com/rust-lang/rust/pull/84988
412 [84701]: https://github.com/rust-lang/rust/pull/84701
413 [84072]: https://github.com/rust-lang/rust/pull/84072
414 [85745]: https://github.com/rust-lang/rust/pull/85745
415 [84744]: https://github.com/rust-lang/rust/pull/84744
416 [85078]: https://github.com/rust-lang/rust/pull/85078
417 [84717]: https://github.com/rust-lang/rust/pull/84717
418 [83800]: https://github.com/rust-lang/rust/pull/83800
419 [83366]: https://github.com/rust-lang/rust/pull/83366
420 [83278]: https://github.com/rust-lang/rust/pull/83278
421 [85292]: https://github.com/rust-lang/rust/pull/85292
422 [82834]: https://github.com/rust-lang/rust/pull/82834
423 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
424 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
425 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
426 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
427 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
428 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
429 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
430 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
431 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
432 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
433 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
435 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
437 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
439 Version 1.53.0 (2021-06-17)
440 ============================
443 -----------------------
444 - [You can now use unicode for identifiers.][83799] This allows multilingual
445 identifiers but still doesn't allow glyphs that are not considered characters
446 such as `◆` or `🦀`. More specifically you can now use any identifier that
447 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
448 is the same standard as languages like Python, however Rust uses NFC
449 normalization which may be different from other languages.
450 - [You can now specify "or patterns" inside pattern matches.][79278]
451 Previously you could only use `|` (OR) on complete patterns. E.g.
455 matches!(x, Some(1) | Some(2));
457 matches!(x, Some(1 | 2));
459 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
460 has the same semantics as the `:pat` matcher. This is to allow `:pat`
461 to change semantics to being a pattern fragment in a future edition.
464 -----------------------
465 - [Updated the minimum external LLVM version to LLVM 10.][83387]
466 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
467 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
469 \* Refer to Rust's [platform support page][platform-support-doc] for more
470 information on Rust's tiered platform support.
473 -----------------------
474 - [Abort messages will now forward to `android_set_abort_message` on
475 Android platforms when available.][81469]
476 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
477 - [Arrays of any length now implement `IntoIterator`.][84147]
478 Currently calling `.into_iter()` as a method on an array will
479 return `impl Iterator<Item=&T>`, but this may change in a
480 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
481 directly on arrays will provide `impl Iterator<Item=T>` as expected.
482 - [`leading_zeros`, and `trailing_zeros` are now available on all
483 `NonZero` integer types.][84082]
484 - [`{f32, f64}::from_str` now parse and print special values
485 (`NaN`, `-0`) according to IEEE 754.][78618]
486 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
487 - [Add the `BITS` associated constant to all numeric types.][82565]
491 - [`AtomicBool::fetch_update`]
492 - [`AtomicPtr::fetch_update`]
493 - [`BTreeMap::retain`]
494 - [`BTreeSet::retain`]
495 - [`BufReader::seek_relative`]
496 - [`DebugStruct::non_exhaustive`]
499 - [`Duration::is_zero`]
500 - [`Duration::saturating_add`]
501 - [`Duration::saturating_mul`]
502 - [`Duration::saturating_sub`]
503 - [`ErrorKind::Unsupported`]
505 - [`Ordering::is_eq`]
506 - [`Ordering::is_ge`]
507 - [`Ordering::is_gt`]
508 - [`Ordering::is_le`]
509 - [`Ordering::is_lt`]
510 - [`Ordering::is_ne`]
511 - [`OsStr::is_ascii`]
512 - [`OsStr::make_ascii_lowercase`]
513 - [`OsStr::make_ascii_uppercase`]
514 - [`OsStr::to_ascii_lowercase`]
515 - [`OsStr::to_ascii_uppercase`]
516 - [`Peekable::peek_mut`]
517 - [`Rc::decrement_strong_count`]
518 - [`Rc::increment_strong_count`]
519 - [`Vec::extend_from_within`]
520 - [`array::from_mut`]
521 - [`array::from_ref`]
522 - [`cmp::max_by_key`]
524 - [`cmp::min_by_key`]
526 - [`f32::is_subnormal`]
527 - [`f64::is_subnormal`]
530 -----------------------
531 - [Cargo now supports git repositories where the default `HEAD` branch is not
532 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
533 which can handle default branches correctly.
534 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
535 - [The `authors` field is no longer included in `Cargo.toml` for new
536 projects.][cargo/9282]
539 -----------------------
540 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
541 without hyperlinks.][81764]
545 - [Implement token-based handling of attributes during expansion][82608]
546 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
547 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
548 to confusion and potential security vulnerabilities and [is no
549 longer recommended][ietf6943].
550 - [The added `BITS` constant may conflict with external definitions.][85667]
551 In particular, this was known to be a problem in the `lexical-core` crate,
552 but they have published fixes for semantic versions 0.4 through 0.7. To
553 update this dependency alone, use `cargo update -p lexical-core`.
554 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
558 These changes provide no direct user facing benefits, but represent significant
559 improvements to the internals and overall performance of rustc and
562 - [Rework the `std::sys::windows::alloc` implementation.][83065]
563 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
564 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
565 - [Rework rustdoc const type][82873]
567 [85667]: https://github.com/rust-lang/rust/pull/85667
568 [83386]: https://github.com/rust-lang/rust/pull/83386
569 [82771]: https://github.com/rust-lang/rust/pull/82771
570 [84147]: https://github.com/rust-lang/rust/pull/84147
571 [84082]: https://github.com/rust-lang/rust/pull/84082
572 [83799]: https://github.com/rust-lang/rust/pull/83799
573 [83681]: https://github.com/rust-lang/rust/pull/83681
574 [83652]: https://github.com/rust-lang/rust/pull/83652
575 [83387]: https://github.com/rust-lang/rust/pull/83387
576 [82873]: https://github.com/rust-lang/rust/pull/82873
577 [82864]: https://github.com/rust-lang/rust/pull/82864
578 [82608]: https://github.com/rust-lang/rust/pull/82608
579 [82565]: https://github.com/rust-lang/rust/pull/82565
580 [80525]: https://github.com/rust-lang/rust/pull/80525
581 [79278]: https://github.com/rust-lang/rust/pull/79278
582 [78618]: https://github.com/rust-lang/rust/pull/78618
583 [77704]: https://github.com/rust-lang/rust/pull/77704
584 [83941]: https://github.com/rust-lang/rust/pull/83941
585 [83065]: https://github.com/rust-lang/rust/pull/83065
586 [81764]: https://github.com/rust-lang/rust/pull/81764
587 [81469]: https://github.com/rust-lang/rust/pull/81469
588 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
589 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
590 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
591 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
592 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
593 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
594 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
595 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
596 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
597 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
598 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
599 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
600 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
601 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
602 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
603 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
604 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
605 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
606 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
607 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
608 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
609 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
610 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
611 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
612 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
613 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
614 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
615 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
616 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
617 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
618 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
619 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
620 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
621 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
622 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
623 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
624 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
625 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
626 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
627 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
628 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
629 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
632 Version 1.52.1 (2021-05-10)
633 ============================
635 This release disables incremental compilation, unless the user has explicitly
636 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
638 This is due to the widespread, and frequently occuring, breakage encountered by
639 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
640 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
641 newly added incremental verification are still present in past stable versions,
642 and are not yet fixed on any channel. These bugs can lead to miscompilation of
645 These problems only affect incremental builds, so release builds with Cargo
646 should not be affected unless the user has explicitly opted into incremental.
647 Debug and check builds are affected.
649 See [84970] for more details.
651 [84970]: https://github.com/rust-lang/rust/issues/84970
653 Version 1.52.0 (2021-05-06)
654 ============================
658 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
659 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
660 is allowed by default, and may become a warning or hard error in a
662 - [You can now cast mutable references to arrays to a pointer of the same type as
667 - [Upgraded the default LLVM to LLVM 12.][81451]
669 Added tier 3\* support for the following targets.
671 - [`s390x-unknown-linux-musl`][82166]
672 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
673 - [`powerpc-unknown-openbsd`][82733]
675 \* Refer to Rust's [platform support page][platform-support-doc] for more
676 information on Rust's tiered platform support.
680 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
681 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
682 - [`Arc<impl Error>` now implements `error::Error`.][80553]
683 - [All integer division and remainder operations are now `const`.][80962]
687 - [`Arguments::as_str`]
689 - [`char::REPLACEMENT_CHARACTER`]
690 - [`char::UNICODE_VERSION`]
691 - [`char::decode_utf16`]
692 - [`char::from_digit`]
693 - [`char::from_u32_unchecked`]
695 - [`slice::partition_point`]
696 - [`str::rsplit_once`]
697 - [`str::split_once`]
699 The following previously stable APIs are now `const`.
702 - [`char::len_utf16`]
703 - [`char::to_ascii_uppercase`]
704 - [`char::to_ascii_lowercase`]
705 - [`char::eq_ignore_ascii_case`]
706 - [`u8::to_ascii_uppercase`]
707 - [`u8::to_ascii_lowercase`]
708 - [`u8::eq_ignore_ascii_case`]
712 - [Rustdoc lints are now treated as a tool lint, meaning that
713 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
714 Using the old style is still allowed, and will become a warning in
716 - [Rustdoc now supports argument files.][82261]
717 - [Rustdoc now generates smart punctuation for documentation.][79423]
718 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
726 - [You can now pass multiple filters to tests.][81356] E.g.
727 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
728 - [Rustup now distributes PDB symbols for the `std` library on Windows,
729 allowing you to see `std` symbols when debugging.][82218]
733 These changes provide no direct user facing benefits, but represent significant
734 improvements to the internals and overall performance of rustc and
737 - [Check the result cache before the DepGraph when ensuring queries][81855]
738 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
739 - [Only store a LocalDefId in some HIR nodes][81611]
740 - [Store HIR attributes in a side table][79519]
744 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
745 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
746 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
747 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
748 languages in code blocks.][78429]
749 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
750 - [Changes in how proc macros handle whitespace may lead to panics when used
751 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
752 - [Turn `#[derive]` into a regular macro attribute][79078]
754 [84136]: https://github.com/rust-lang/rust/issues/84136
755 [80763]: https://github.com/rust-lang/rust/pull/80763
756 [82166]: https://github.com/rust-lang/rust/pull/82166
757 [82121]: https://github.com/rust-lang/rust/pull/82121
758 [81879]: https://github.com/rust-lang/rust/pull/81879
759 [82261]: https://github.com/rust-lang/rust/pull/82261
760 [82218]: https://github.com/rust-lang/rust/pull/82218
761 [82216]: https://github.com/rust-lang/rust/pull/82216
762 [82202]: https://github.com/rust-lang/rust/pull/82202
763 [81855]: https://github.com/rust-lang/rust/pull/81855
764 [81766]: https://github.com/rust-lang/rust/pull/81766
765 [81744]: https://github.com/rust-lang/rust/pull/81744
766 [81611]: https://github.com/rust-lang/rust/pull/81611
767 [81479]: https://github.com/rust-lang/rust/pull/81479
768 [81451]: https://github.com/rust-lang/rust/pull/81451
769 [81356]: https://github.com/rust-lang/rust/pull/81356
770 [80962]: https://github.com/rust-lang/rust/pull/80962
771 [80553]: https://github.com/rust-lang/rust/pull/80553
772 [80527]: https://github.com/rust-lang/rust/pull/80527
773 [79519]: https://github.com/rust-lang/rust/pull/79519
774 [79423]: https://github.com/rust-lang/rust/pull/79423
775 [79208]: https://github.com/rust-lang/rust/pull/79208
776 [78429]: https://github.com/rust-lang/rust/pull/78429
777 [82733]: https://github.com/rust-lang/rust/pull/82733
778 [82594]: https://github.com/rust-lang/rust/pull/82594
779 [79078]: https://github.com/rust-lang/rust/pull/79078
780 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
781 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
782 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
783 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
784 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
785 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
786 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
787 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
788 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
789 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
790 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
791 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
792 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
793 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
794 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
795 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
796 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
797 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
798 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
799 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
800 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
801 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
803 Version 1.51.0 (2021-03-25)
804 ============================
808 - [You can now parameterize items such as functions, traits, and `struct`s by constant
809 values in addition to by types and lifetimes.][79135] Also known as "const generics"
810 E.g. you can now write the following. Note: Only values of primitive integers,
811 `bool`, or `char` types are currently permitted.
813 struct GenericArray<T, const LENGTH: usize> {
817 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
818 const fn last(&self) -> Option<&T> {
822 Some(&self.inner[LENGTH - 1])
832 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
833 This option controls whether debug information is split across multiple files
834 or packed into a single file. **Note** This option is unstable on other platforms.
835 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
836 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
837 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
838 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
840 \* Refer to Rust's [platform support page][platform-support-doc] for more
841 information on Rust's tiered platform support.
846 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
847 - [`str` now implements `AsMut<str>`.][80279]
848 - [`u64` and `u128` now implement `From<char>`.][79502]
849 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
850 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
851 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
852 - [`io::Empty` now implements `io::Seek`.][78044]
853 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
854 `T: ?Sized` types.][80764]
855 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
861 - [`Arc::decrement_strong_count`]
862 - [`Arc::increment_strong_count`]
863 - [`Once::call_once_force`]
864 - [`Peekable::next_if_eq`]
865 - [`Peekable::next_if`]
866 - [`Seek::stream_position`]
867 - [`array::IntoIter`]
868 - [`panic::panic_any`]
870 - [`ptr::addr_of_mut!`]
871 - [`slice::fill_with`]
872 - [`slice::split_inclusive_mut`]
873 - [`slice::split_inclusive`]
874 - [`slice::strip_prefix`]
875 - [`slice::strip_suffix`]
876 - [`str::split_inclusive`]
877 - [`sync::OnceState`]
879 - [`VecDeque::range`]
880 - [`VecDeque::range_mut`]
884 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
885 codegen option.][cargo/9112]
886 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
887 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
888 to avoid unifying features of dependencies where that unification could be unwanted.
889 Such as using the same dependency with a `std` feature in a build scripts and
890 proc-macros, while using the `no-std` feature in the final binary. See the
891 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
896 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
897 - [You can now provide a `--default-theme` flag which sets the default theme to use for
898 documentation.][79642]
900 Various improvements to intra-doc links:
902 - [You can link to non-path primitives such as `slice`.][80181]
903 - [You can link to associated items.][74489]
904 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
908 - [You can now pass `--include-ignored` to tests (e.g. with
909 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
914 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
915 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
917 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
918 for the distributed artifacts.][81521]
919 - `armv5te-unknown-linux-gnueabi`
920 - `sparc64-unknown-linux-gnu`
921 - `thumbv7neon-unknown-linux-gnueabihf`
922 - `armv7-unknown-linux-gnueabi`
923 - `x86_64-unknown-linux-gnux32`
924 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
929 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
931 [79135]: https://github.com/rust-lang/rust/pull/79135
932 [74489]: https://github.com/rust-lang/rust/pull/74489
933 [76934]: https://github.com/rust-lang/rust/pull/76934
934 [79570]: https://github.com/rust-lang/rust/pull/79570
935 [80181]: https://github.com/rust-lang/rust/pull/80181
936 [79642]: https://github.com/rust-lang/rust/pull/79642
937 [80945]: https://github.com/rust-lang/rust/pull/80945
938 [80279]: https://github.com/rust-lang/rust/pull/80279
939 [80053]: https://github.com/rust-lang/rust/pull/80053
940 [79502]: https://github.com/rust-lang/rust/pull/79502
941 [75180]: https://github.com/rust-lang/rust/pull/75180
942 [79135]: https://github.com/rust-lang/rust/pull/79135
943 [81521]: https://github.com/rust-lang/rust/pull/81521
944 [80968]: https://github.com/rust-lang/rust/pull/80968
945 [80959]: https://github.com/rust-lang/rust/pull/80959
946 [80718]: https://github.com/rust-lang/rust/pull/80718
947 [80653]: https://github.com/rust-lang/rust/pull/80653
948 [80579]: https://github.com/rust-lang/rust/pull/80579
949 [79998]: https://github.com/rust-lang/rust/pull/79998
950 [78044]: https://github.com/rust-lang/rust/pull/78044
951 [81455]: https://github.com/rust-lang/rust/pull/81455
952 [80764]: https://github.com/rust-lang/rust/pull/80764
953 [80749]: https://github.com/rust-lang/rust/pull/80749
954 [80662]: https://github.com/rust-lang/rust/pull/80662
955 [79134]: https://github.com/rust-lang/rust/pull/79134
956 [80966]: https://github.com/rust-lang/rust/pull/80966
957 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
958 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
959 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
960 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
961 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
962 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
963 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
964 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
965 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
966 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
967 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
968 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
969 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
970 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
971 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
972 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
973 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
974 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
975 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
976 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
977 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
978 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
979 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
981 Version 1.50.0 (2021-02-11)
982 ============================
985 -----------------------
986 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
987 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
988 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
991 -----------------------
992 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
993 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
994 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
995 - [Dropped support for all cloudabi targets.][78439]
997 \* Refer to Rust's [platform support page][platform-support-doc] for more
998 information on Rust's tiered platform support.
1001 -----------------------
1003 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1004 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1005 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1006 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1007 up the same amount of space as `File`.
1013 - [`btree_map::Entry::or_insert_with_key`]
1016 - [`hash_map::Entry::or_insert_with_key`]
1020 - [`UnsafeCell::get_mut`]
1022 The following previously stable methods are now `const`.
1024 - [`IpAddr::is_ipv4`]
1025 - [`IpAddr::is_ipv6`]
1026 - [`IpAddr::is_unspecified`]
1027 - [`IpAddr::is_loopback`]
1028 - [`IpAddr::is_multicast`]
1029 - [`Ipv4Addr::octets`]
1030 - [`Ipv4Addr::is_loopback`]
1031 - [`Ipv4Addr::is_private`]
1032 - [`Ipv4Addr::is_link_local`]
1033 - [`Ipv4Addr::is_multicast`]
1034 - [`Ipv4Addr::is_broadcast`]
1035 - [`Ipv4Addr::is_documentation`]
1036 - [`Ipv4Addr::to_ipv6_compatible`]
1037 - [`Ipv4Addr::to_ipv6_mapped`]
1038 - [`Ipv6Addr::segments`]
1039 - [`Ipv6Addr::is_unspecified`]
1040 - [`Ipv6Addr::is_loopback`]
1041 - [`Ipv6Addr::is_multicast`]
1042 - [`Ipv6Addr::to_ipv4`]
1045 - [`Layout::from_size_align`]
1046 - `pow` for all integer types.
1047 - `checked_pow` for all integer types.
1048 - `saturating_pow` for all integer types.
1049 - `wrapping_pow` for all integer types.
1050 - `next_power_of_two` for all unsigned integer types.
1051 - `checked_next_power_of_two` for all unsigned integer types.
1054 -----------------------
1056 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1057 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1058 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1059 contents of that directory for changes.][cargo/8973]
1060 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1065 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1066 - [Running tests will now print the total time taken to execute.][75752]
1071 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1072 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1073 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1074 unhygenic `macro_rules!` macros.][79472]
1075 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1076 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1077 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1078 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1079 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1080 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1082 [74989]: https://github.com/rust-lang/rust/pull/74989
1083 [79261]: https://github.com/rust-lang/rust/pull/79261
1084 [79896]: https://github.com/rust-lang/rust/pull/79896
1085 [79484]: https://github.com/rust-lang/rust/pull/79484
1086 [79472]: https://github.com/rust-lang/rust/pull/79472
1087 [79270]: https://github.com/rust-lang/rust/pull/79270
1088 [79003]: https://github.com/rust-lang/rust/pull/79003
1089 [78864]: https://github.com/rust-lang/rust/pull/78864
1090 [78636]: https://github.com/rust-lang/rust/pull/78636
1091 [78439]: https://github.com/rust-lang/rust/pull/78439
1092 [78343]: https://github.com/rust-lang/rust/pull/78343
1093 [78296]: https://github.com/rust-lang/rust/pull/78296
1094 [78068]: https://github.com/rust-lang/rust/pull/78068
1095 [75752]: https://github.com/rust-lang/rust/pull/75752
1096 [74699]: https://github.com/rust-lang/rust/pull/74699
1097 [78142]: https://github.com/rust-lang/rust/pull/78142
1098 [77484]: https://github.com/rust-lang/rust/pull/77484
1099 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1100 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1101 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1102 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1103 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1104 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1105 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1106 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1107 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1108 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1109 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1110 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1111 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1112 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1113 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1114 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1115 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1116 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1117 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1118 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1119 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1120 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1121 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1122 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1123 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1124 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1125 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1126 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1127 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1128 [`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
1129 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1130 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1131 [`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
1132 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1135 Version 1.49.0 (2020-12-31)
1136 ============================
1139 -----------------------
1141 - [Unions can now implement `Drop`, and you can now have a field in a union
1142 with `ManuallyDrop<T>`.][77547]
1143 - [You can now cast uninhabited enums to integers.][76199]
1144 - [You can now bind by reference and by move in patterns.][76119] This
1145 allows you to selectively borrow individual components of a type. E.g.
1153 let person = Person {
1154 name: String::from("Alice"),
1158 // `name` is moved out of person, but `age` is referenced.
1159 let Person { name, ref age } = person;
1160 println!("{} {}", name, age);
1164 -----------------------
1166 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1167 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1168 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1169 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1170 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1171 - [Output from threads spawned in tests is now captured.][78227]
1172 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1174 \* Refer to Rust's [platform support page][platform-support-doc] for more
1175 information on Rust's tiered platform support.
1178 -----------------------
1180 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1181 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1186 - [`slice::select_nth_unstable`]
1187 - [`slice::select_nth_unstable_by`]
1188 - [`slice::select_nth_unstable_by_key`]
1190 The following previously stable methods are now `const`.
1192 - [`Poll::is_ready`]
1193 - [`Poll::is_pending`]
1196 -----------------------
1197 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1198 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1199 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1200 variable will be set if the crate being built is one the user selected to build, either
1201 with `-p` or through defaults.
1202 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1208 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1209 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1210 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1211 Previously such invalid or unused attributes could be ignored.
1212 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1213 read [this post about the changes][rustdoc-ws-post] for more details.
1214 - [Trait bounds are no longer inferred for associated types.][79904]
1218 These changes provide no direct user facing benefits, but represent significant
1219 improvements to the internals and overall performance of rustc and
1222 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1223 Local Storage model.][78201]
1224 - [Calculate visibilities once in resolve.][78077]
1225 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1226 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1229 [75991]: https://github.com/rust-lang/rust/pull/75991
1230 [78951]: https://github.com/rust-lang/rust/pull/78951
1231 [78848]: https://github.com/rust-lang/rust/pull/78848
1232 [78746]: https://github.com/rust-lang/rust/pull/78746
1233 [78376]: https://github.com/rust-lang/rust/pull/78376
1234 [78228]: https://github.com/rust-lang/rust/pull/78228
1235 [78227]: https://github.com/rust-lang/rust/pull/78227
1236 [78201]: https://github.com/rust-lang/rust/pull/78201
1237 [78109]: https://github.com/rust-lang/rust/pull/78109
1238 [78077]: https://github.com/rust-lang/rust/pull/78077
1239 [77997]: https://github.com/rust-lang/rust/pull/77997
1240 [77703]: https://github.com/rust-lang/rust/pull/77703
1241 [77547]: https://github.com/rust-lang/rust/pull/77547
1242 [77015]: https://github.com/rust-lang/rust/pull/77015
1243 [76199]: https://github.com/rust-lang/rust/pull/76199
1244 [76119]: https://github.com/rust-lang/rust/pull/76119
1245 [75914]: https://github.com/rust-lang/rust/pull/75914
1246 [79004]: https://github.com/rust-lang/rust/pull/79004
1247 [78676]: https://github.com/rust-lang/rust/pull/78676
1248 [79904]: https://github.com/rust-lang/rust/issues/79904
1249 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1250 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1251 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1252 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1253 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1254 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1255 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1256 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1257 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1258 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1259 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1261 Version 1.48.0 (2020-11-19)
1262 ==========================
1267 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1268 is still rejected *semantically*, but can now be parsed by procedural macros.
1272 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1273 `rustc` whether to link its own C runtime and libraries or to rely on a external
1274 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1275 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1276 Note: If you're using cargo you must explicitly pass the `--target` flag.
1277 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1279 \* Refer to Rust's [platform support page][platform-support-doc] for more
1280 information on Rust's tiered platform support.
1284 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1285 and `&Stderr`.][76275]
1286 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1287 - [The `matches!` macro now supports having a trailing comma.][74880]
1288 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1289 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1293 - [`slice::as_ptr_range`]
1294 - [`slice::as_mut_ptr_range`]
1295 - [`VecDeque::make_contiguous`]
1296 - [`future::pending`]
1299 The following previously stable methods are now `const fn`'s:
1301 - [`Option::is_some`]
1302 - [`Option::is_none`]
1303 - [`Option::as_ref`]
1305 - [`Result::is_err`]
1306 - [`Result::as_ref`]
1307 - [`Ordering::reverse`]
1308 - [`Ordering::then`]
1315 - [You can now link to items in `rustdoc` using the intra-doc link
1316 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1317 a link to `std::future`'s documentation. See ["Linking to items by
1318 name"][intradoc-links] for more information.
1319 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1320 when searching through `rustdoc`'s UI.][75740]
1324 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1325 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1326 promoted to `'static` lifetime any more inside `const fn`s.
1327 - [Associated type bindings on trait objects are now verified to meet the bounds
1328 declared on the trait when checking that they implement the trait.][27675]
1329 - [When trait bounds on associated types or opaque types are ambiguous, the
1330 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1331 - [Fixed recursive nonterminals not being expanded in macros during
1332 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1333 correctly handling recursive nonterminal tokens.
1334 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1335 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1336 in places where they have no effect.][73461]
1337 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1338 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1339 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1340 disallow zero-initialization.][71274]
1341 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1342 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1343 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1344 see the [`catch_unwind`] documentation for further information.
1350 These changes provide no direct user facing benefits, but represent significant
1351 improvements to the internals and overall performance of rustc and
1354 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1355 You can continue building with `make` by setting `ninja=false` in
1357 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1358 - [Made `ensure_sufficient_stack()` non-generic][76680]
1360 [78143]: https://github.com/rust-lang/rust/issues/78143
1361 [76680]: https://github.com/rust-lang/rust/pull/76680/
1362 [76030]: https://github.com/rust-lang/rust/pull/76030/
1363 [70212]: https://github.com/rust-lang/rust/pull/70212/
1364 [27675]: https://github.com/rust-lang/rust/issues/27675/
1365 [54121]: https://github.com/rust-lang/rust/issues/54121/
1366 [71274]: https://github.com/rust-lang/rust/pull/71274/
1367 [77386]: https://github.com/rust-lang/rust/pull/77386/
1368 [77153]: https://github.com/rust-lang/rust/pull/77153/
1369 [77055]: https://github.com/rust-lang/rust/pull/77055/
1370 [76275]: https://github.com/rust-lang/rust/pull/76275/
1371 [76310]: https://github.com/rust-lang/rust/pull/76310/
1372 [76420]: https://github.com/rust-lang/rust/pull/76420/
1373 [76158]: https://github.com/rust-lang/rust/pull/76158/
1374 [75857]: https://github.com/rust-lang/rust/pull/75857/
1375 [75585]: https://github.com/rust-lang/rust/pull/75585/
1376 [75740]: https://github.com/rust-lang/rust/pull/75740/
1377 [75502]: https://github.com/rust-lang/rust/pull/75502/
1378 [74880]: https://github.com/rust-lang/rust/pull/74880/
1379 [74922]: https://github.com/rust-lang/rust/pull/74922/
1380 [74430]: https://github.com/rust-lang/rust/pull/74430/
1381 [74194]: https://github.com/rust-lang/rust/pull/74194/
1382 [73461]: https://github.com/rust-lang/rust/pull/73461/
1383 [73166]: https://github.com/rust-lang/rust/pull/73166/
1384 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1385 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1386 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1387 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1388 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1389 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1390 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1391 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1392 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1393 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1394 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1395 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1396 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1397 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1398 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1401 Version 1.47.0 (2020-10-08)
1402 ==========================
1406 - [Closures will now warn when not used.][74869]
1410 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1411 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1413 - [Upgraded to LLVM 11.][73526]
1414 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1415 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1416 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1418 \* Refer to Rust's [platform support page][platform-support-doc] for more
1419 information on Rust's tiered platform support.
1423 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1424 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1425 those of length less than 33.][74060]
1426 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1427 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1428 `PartialEq`, and `PartialOrd`.][73583]
1432 - [`Ident::new_raw`]
1433 - [`Range::is_empty`]
1434 - [`RangeInclusive::is_empty`]
1435 - [`Result::as_deref`]
1436 - [`Result::as_deref_mut`]
1438 - [`pointer::offset_from`]
1442 The following previously stable APIs have now been made const.
1444 - [The `new` method for all `NonZero` integers.][73858]
1445 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1446 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1447 methods for all integers.][73858]
1448 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1449 signed integers.][73858]
1450 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1451 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1452 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1453 `is_ascii_control` methods for `char` and `u8`.][73858]
1457 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1458 You can override this by setting the following in your `Cargo.toml`.
1460 [profile.release.build-override]
1463 - [`cargo-help` will now display man pages for commands rather just the
1464 `--help` text.][cargo/8456]
1465 - [`cargo-metadata` now emits a `test` field indicating if a target has
1466 tests enabled.][cargo/8478]
1467 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1468 - [`cargo-publish` will now use an alternative registry by default if it's the
1469 only registry specified in `package.publish`.][cargo/8571]
1473 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1474 type based search.][75366]
1475 - [Added the Ayu theme to rustdoc.][71237]
1479 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1480 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1481 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1482 help to preserve more span information.][73084] These changes may cause
1483 compiliation errors if your macro was unhygenic or didn't correctly handle
1485 - [Moved support for the CloudABI target to tier 3.][75568]
1486 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1487 - [Added the `rustc-docs` component.][75560] This allows you to install
1488 and read the documentation for the compiler internal APIs. (Currently only
1489 available for `x86_64-unknown-linux-gnu`.)
1494 - [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.
1496 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1497 [75048]: https://github.com/rust-lang/rust/pull/75048/
1498 [74163]: https://github.com/rust-lang/rust/pull/74163/
1499 [71237]: https://github.com/rust-lang/rust/pull/71237/
1500 [74869]: https://github.com/rust-lang/rust/pull/74869/
1501 [73858]: https://github.com/rust-lang/rust/pull/73858/
1502 [75716]: https://github.com/rust-lang/rust/pull/75716/
1503 [75908]: https://github.com/rust-lang/rust/pull/75908/
1504 [75516]: https://github.com/rust-lang/rust/pull/75516/
1505 [75560]: https://github.com/rust-lang/rust/pull/75560/
1506 [75568]: https://github.com/rust-lang/rust/pull/75568/
1507 [75366]: https://github.com/rust-lang/rust/pull/75366/
1508 [75204]: https://github.com/rust-lang/rust/pull/75204/
1509 [74650]: https://github.com/rust-lang/rust/pull/74650/
1510 [74419]: https://github.com/rust-lang/rust/pull/74419/
1511 [73964]: https://github.com/rust-lang/rust/pull/73964/
1512 [74021]: https://github.com/rust-lang/rust/pull/74021/
1513 [74060]: https://github.com/rust-lang/rust/pull/74060/
1514 [73893]: https://github.com/rust-lang/rust/pull/73893/
1515 [73526]: https://github.com/rust-lang/rust/pull/73526/
1516 [73583]: https://github.com/rust-lang/rust/pull/73583/
1517 [73084]: https://github.com/rust-lang/rust/pull/73084/
1518 [73197]: https://github.com/rust-lang/rust/pull/73197/
1519 [72488]: https://github.com/rust-lang/rust/pull/72488/
1520 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1521 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1522 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1523 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1524 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1525 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1526 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1527 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1528 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1529 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1530 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1531 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1532 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1533 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1534 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1537 Version 1.46.0 (2020-08-27)
1538 ==========================
1542 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1543 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1544 const functions.][73862]
1545 - [The `#[track_caller]` attribute can now be added to functions to use the
1546 function's caller's location information for panic messages.][72445]
1547 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1548 `x.0.0` over `(x.0).0`.
1549 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1550 You currently can't use `mem::transmute` in constant functions.
1554 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1555 - [Enabled static "Position Independent Executables" by default
1556 for `x86_64-unknown-linux-musl`.][70740]
1560 - [`mem::forget` is now a `const fn`.][73887]
1561 - [`String` now implements `From<char>`.][73466]
1562 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1563 integer types.][73032]
1564 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1565 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1566 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1567 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1568 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1569 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1574 - [`vec::Drain::as_slice`]
1578 Added a number of new environment variables that are now available when
1579 compiling your crate.
1581 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1582 the specific binary being compiled and the name of the crate.
1583 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1584 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1588 - [The target configuration option `abi_blacklist` has been renamed
1589 to `unsupported_abis`.][74150] The old name will still continue to work.
1590 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1591 This was previously accepted but will become a hard error in a future release.
1592 - [Rustc will fail to compile if you have a struct with
1593 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1595 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1596 ensure that spans have the correct information, and may cause breakage if you
1597 were relying on receiving spans with dummy information.
1598 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1599 a legacy installer that was replaced by a MSI installer a few years ago but
1600 was still being built.
1601 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1602 - [Rustc will no longer accept overlapping trait implementations that only
1603 differ in how the lifetime was bound.][72493]
1604 - [Rustc now correctly relates the lifetime of an existential associated
1605 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1606 you to pass a shorter lifetime than expected.
1607 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1608 The library will need to be installed for `rustc` to work, even though we
1609 expect it to be already available on most systems.
1610 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1612 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1613 exact output returned by rustc's pretty printing is an unstable
1614 implementation detail: we recommend any macro relying on it to switch to a
1615 more robust parsing system.
1617 [75453]: https://github.com/rust-lang/rust/issues/75453/
1618 [74820]: https://github.com/rust-lang/rust/issues/74820/
1619 [74420]: https://github.com/rust-lang/rust/issues/74420/
1620 [74109]: https://github.com/rust-lang/rust/pull/74109/
1621 [74150]: https://github.com/rust-lang/rust/pull/74150/
1622 [73862]: https://github.com/rust-lang/rust/pull/73862/
1623 [73887]: https://github.com/rust-lang/rust/pull/73887/
1624 [73466]: https://github.com/rust-lang/rust/pull/73466/
1625 [73516]: https://github.com/rust-lang/rust/pull/73516/
1626 [73293]: https://github.com/rust-lang/rust/pull/73293/
1627 [73007]: https://github.com/rust-lang/rust/pull/73007/
1628 [73032]: https://github.com/rust-lang/rust/pull/73032/
1629 [72920]: https://github.com/rust-lang/rust/pull/72920/
1630 [72569]: https://github.com/rust-lang/rust/pull/72569/
1631 [72583]: https://github.com/rust-lang/rust/pull/72583/
1632 [72584]: https://github.com/rust-lang/rust/pull/72584/
1633 [72717]: https://github.com/rust-lang/rust/pull/72717/
1634 [72437]: https://github.com/rust-lang/rust/pull/72437/
1635 [72445]: https://github.com/rust-lang/rust/pull/72445/
1636 [72486]: https://github.com/rust-lang/rust/pull/72486/
1637 [72493]: https://github.com/rust-lang/rust/pull/72493/
1638 [72331]: https://github.com/rust-lang/rust/pull/72331/
1639 [71896]: https://github.com/rust-lang/rust/pull/71896/
1640 [71660]: https://github.com/rust-lang/rust/pull/71660/
1641 [71322]: https://github.com/rust-lang/rust/pull/71322/
1642 [70740]: https://github.com/rust-lang/rust/pull/70740/
1643 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1644 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1645 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1646 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1647 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1650 Version 1.45.2 (2020-08-03)
1651 ==========================
1653 * [Fix bindings in tuple struct patterns][74954]
1654 * [Fix track_caller integration with trait objects][74784]
1656 [74954]: https://github.com/rust-lang/rust/issues/74954
1657 [74784]: https://github.com/rust-lang/rust/issues/74784
1660 Version 1.45.1 (2020-07-30)
1661 ==========================
1663 * [Fix const propagation with references.][73613]
1664 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1665 * [Avoid spurious implicit region bound.][74509]
1666 * [Install clippy on x.py install][74457]
1668 [73613]: https://github.com/rust-lang/rust/pull/73613
1669 [73078]: https://github.com/rust-lang/rust/issues/73078
1670 [74509]: https://github.com/rust-lang/rust/pull/74509
1671 [74457]: https://github.com/rust-lang/rust/pull/74457
1674 Version 1.45.0 (2020-07-16)
1675 ==========================
1679 - [Out of range float to int conversions using `as` has been defined as a saturating
1680 conversion.][71269] This was previously undefined behaviour, but you can use the
1681 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1682 may be desirable in rare performance sensitive situations.
1683 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1684 using `u64`.][70705]
1685 - [Function like procedural macros can now be used in expression, pattern, and statement
1686 positions.][68717] This means you can now use a function-like procedural macro
1687 anywhere you can use a declarative (`macro_rules!`) macro.
1691 - [You can now override individual target features through the `target-feature`
1692 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1693 equivalent to `-C target-feature=+avx2,+fma`.
1694 - [Added the `force-unwind-tables` flag.][69984] This option allows
1695 rustc to always generate unwind tables regardless of panic strategy.
1696 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1697 to include LLVM bitcode into generated `rlib`s (this is on by default).
1698 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1699 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1700 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1701 - [Upgraded to LLVM 10.][67759]
1703 \* Refer to Rust's [platform support page][platform-support-doc] for more
1704 information on Rust's tiered platform support.
1709 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1711 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1712 - [You can now use `char` with
1713 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1714 a range of codepoints.][72413] E.g.
1715 you can now write the following;
1717 for ch in 'a'..='z' {
1721 // Prints "abcdefghijklmnopqrstuvwxyz"
1723 - [`OsString` now implements `FromStr`.][71662]
1724 - [The `saturating_neg` method has been added to all signed integer primitive
1725 types, and the `saturating_abs` method has been added for all integer
1726 primitive types.][71886]
1727 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1728 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1730 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1731 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1732 integer types.][69813]
1733 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1734 integer types.][72324]
1735 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1740 - [`BTreeMap::remove_entry`]
1742 - [`rc::Weak::as_ptr`]
1743 - [`rc::Weak::from_raw`]
1744 - [`rc::Weak::into_raw`]
1745 - [`str::strip_prefix`]
1746 - [`str::strip_suffix`]
1747 - [`sync::Weak::as_ptr`]
1748 - [`sync::Weak::from_raw`]
1749 - [`sync::Weak::into_raw`]
1750 - [`char::UNICODE_VERSION`]
1751 - [`Span::resolved_at`]
1752 - [`Span::located_at`]
1753 - [`Span::mixed_site`]
1754 - [`unix::process::CommandExt::arg0`]
1759 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1764 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1765 `~~outdated information~~` becomes "~~outdated information~~".
1766 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1770 - [Trying to self initialize a static value (that is creating a value using
1771 itself) is unsound and now causes a compile error.][71140]
1772 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1773 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1774 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1775 previously undocumented and not intended for public use. Rustdoc still provides
1776 a non-zero exit code on errors.
1777 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1778 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1779 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1780 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1781 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1785 - [Make clippy a git subtree instead of a git submodule][70655]
1786 - [Unify the undo log of all snapshot types][69464]
1788 [71848]: https://github.com/rust-lang/rust/issues/71848/
1789 [73420]: https://github.com/rust-lang/rust/issues/73420/
1790 [72324]: https://github.com/rust-lang/rust/pull/72324/
1791 [71843]: https://github.com/rust-lang/rust/pull/71843/
1792 [71886]: https://github.com/rust-lang/rust/pull/71886/
1793 [72234]: https://github.com/rust-lang/rust/pull/72234/
1794 [72239]: https://github.com/rust-lang/rust/pull/72239/
1795 [72397]: https://github.com/rust-lang/rust/pull/72397/
1796 [72413]: https://github.com/rust-lang/rust/pull/72413/
1797 [72014]: https://github.com/rust-lang/rust/pull/72014/
1798 [72062]: https://github.com/rust-lang/rust/pull/72062/
1799 [72094]: https://github.com/rust-lang/rust/pull/72094/
1800 [72133]: https://github.com/rust-lang/rust/pull/72133/
1801 [67759]: https://github.com/rust-lang/rust/pull/67759/
1802 [71900]: https://github.com/rust-lang/rust/pull/71900/
1803 [71928]: https://github.com/rust-lang/rust/pull/71928/
1804 [71662]: https://github.com/rust-lang/rust/pull/71662/
1805 [71716]: https://github.com/rust-lang/rust/pull/71716/
1806 [71447]: https://github.com/rust-lang/rust/pull/71447/
1807 [71269]: https://github.com/rust-lang/rust/pull/71269/
1808 [71095]: https://github.com/rust-lang/rust/pull/71095/
1809 [71140]: https://github.com/rust-lang/rust/pull/71140/
1810 [70655]: https://github.com/rust-lang/rust/pull/70655/
1811 [70705]: https://github.com/rust-lang/rust/pull/70705/
1812 [69984]: https://github.com/rust-lang/rust/pull/69984/
1813 [69813]: https://github.com/rust-lang/rust/pull/69813/
1814 [69464]: https://github.com/rust-lang/rust/pull/69464/
1815 [68717]: https://github.com/rust-lang/rust/pull/68717/
1816 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1817 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1818 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1819 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1820 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1821 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1822 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1823 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1824 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1825 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1826 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1827 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1828 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1829 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1830 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1831 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1832 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1835 Version 1.44.1 (2020-06-18)
1836 ===========================
1838 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1839 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1840 * [Fix crashes when finding backtrace on macOS.][71397]
1841 * [Clippy applies lint levels into different files.][clippy/5356]
1843 [71397]: https://github.com/rust-lang/rust/issues/71397
1844 [73078]: https://github.com/rust-lang/rust/issues/73078
1845 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1846 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1849 Version 1.44.0 (2020-06-04)
1850 ==========================
1854 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1855 - [Added the `unused_braces` lint.][70081]
1857 **Syntax-only changes**
1859 - [Expansion-driven outline module parsing][69838]
1864 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1869 These are still rejected semantically, so you will likely receive an error but
1870 these changes can be seen and parsed by macros and conditional compilation.
1874 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1875 Additionally when in incremental mode rustc defaults to 256 codegen units.
1876 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1877 a panic is thrown.][67502]
1878 - [Added tier 3\* support for the `aarch64-unknown-none` and
1879 `aarch64-unknown-none-softfloat` targets.][68334]
1880 - [Added tier 3 support for `arm64-apple-tvos` and
1881 `x86_64-apple-tvos` targets.][68191]
1886 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1887 `vec![]` to be able to be used in `const` contexts.
1888 - [`convert::Infallible` now implements `Hash`.][70281]
1889 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1890 a `&mut OsStr`.][70048]
1891 - [Unicode 13 is now supported.][69929]
1892 - [`String` now implements `From<&mut str>`.][69661]
1893 - [`IoSlice` now implements `Copy`.][69403]
1894 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1895 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1896 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1897 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1898 integer types.][69373]
1902 - [`PathBuf::with_capacity`]
1903 - [`PathBuf::capacity`]
1904 - [`PathBuf::clear`]
1905 - [`PathBuf::reserve`]
1906 - [`PathBuf::reserve_exact`]
1907 - [`PathBuf::shrink_to_fit`]
1908 - [`f32::to_int_unchecked`]
1909 - [`f64::to_int_unchecked`]
1910 - [`Layout::align_to`]
1911 - [`Layout::pad_to_align`]
1913 - [`Layout::extend`]
1917 - [Added the `cargo tree` command which will print a tree graph of
1918 your dependencies.][cargo/8062] E.g.
1920 mdbook v0.3.2 (/Users/src/rust/mdbook)
1922 │ ├── html5ever v0.24.0
1924 │ │ │ └── cfg-if v0.1.9
1926 │ │ └── markup5ever v0.9.0
1927 │ │ ├── log v0.4.8 (*)
1929 │ │ │ └── phf_shared v0.7.24
1930 │ │ │ ├── siphasher v0.2.3
1931 │ │ │ └── unicase v1.4.2
1932 │ │ │ [build-dependencies]
1933 │ │ │ └── version_check v0.1.5
1936 You can also display dependencies on multiple versions of the same crate with
1937 `cargo tree -d` (short for `cargo tree --duplicates`).
1941 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1942 the version in the sidebar.][69494]
1946 - [Rustc now correctly generates static libraries on Windows GNU targets with
1947 the `.a` extension, rather than the previous `.lib`.][70937]
1948 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1949 - [The `file_name` property in JSON output of macro errors now points the actual
1950 source file rather than the previous format of `<NAME macros>`.][70969]
1951 **Note:** this may not point to a file that actually exists on the user's system.
1952 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1953 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1954 not allow zero initialization such as `NonZeroU8`.][66059] This was
1955 previously a warning.
1956 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1957 operator has been defined as a saturating operation.][71269] This was previously
1958 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1959 continue using the current behaviour, which may be desirable in rare performance
1960 sensitive situations.
1964 These changes provide no direct user facing benefits, but represent significant
1965 improvements to the internals and overall performance of rustc and
1968 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1969 - [Replace big JS dict with JSON parsing.][71250]
1971 [69373]: https://github.com/rust-lang/rust/pull/69373/
1972 [66059]: https://github.com/rust-lang/rust/pull/66059/
1973 [68191]: https://github.com/rust-lang/rust/pull/68191/
1974 [68899]: https://github.com/rust-lang/rust/pull/68899/
1975 [71147]: https://github.com/rust-lang/rust/pull/71147/
1976 [71250]: https://github.com/rust-lang/rust/pull/71250/
1977 [70937]: https://github.com/rust-lang/rust/pull/70937/
1978 [70969]: https://github.com/rust-lang/rust/pull/70969/
1979 [70632]: https://github.com/rust-lang/rust/pull/70632/
1980 [70281]: https://github.com/rust-lang/rust/pull/70281/
1981 [70345]: https://github.com/rust-lang/rust/pull/70345/
1982 [70048]: https://github.com/rust-lang/rust/pull/70048/
1983 [70081]: https://github.com/rust-lang/rust/pull/70081/
1984 [70156]: https://github.com/rust-lang/rust/pull/70156/
1985 [71269]: https://github.com/rust-lang/rust/pull/71269/
1986 [69838]: https://github.com/rust-lang/rust/pull/69838/
1987 [69929]: https://github.com/rust-lang/rust/pull/69929/
1988 [69661]: https://github.com/rust-lang/rust/pull/69661/
1989 [69778]: https://github.com/rust-lang/rust/pull/69778/
1990 [69494]: https://github.com/rust-lang/rust/pull/69494/
1991 [69403]: https://github.com/rust-lang/rust/pull/69403/
1992 [69033]: https://github.com/rust-lang/rust/pull/69033/
1993 [68692]: https://github.com/rust-lang/rust/pull/68692/
1994 [68334]: https://github.com/rust-lang/rust/pull/68334/
1995 [67502]: https://github.com/rust-lang/rust/pull/67502/
1996 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1997 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1998 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1999 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2000 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2001 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2002 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2003 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2004 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2005 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2006 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2007 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2008 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2011 Version 1.43.1 (2020-05-07)
2012 ===========================
2014 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2015 * [Fixed the stabilization of AVX-512 features.][71473]
2016 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2018 [71430]: https://github.com/rust-lang/rust/pull/71430
2019 [71473]: https://github.com/rust-lang/rust/issues/71473
2020 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2023 Version 1.43.0 (2020-04-23)
2024 ==========================
2028 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2029 the type inferred correctly.][68129]
2030 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2032 **Syntax only changes**
2033 - [Allow `type Foo: Ord` syntactically.][69361]
2034 - [Fuse associated and extern items up to defaultness.][69194]
2035 - [Syntactically allow `self` in all `fn` contexts.][68764]
2036 - [Merge `fn` syntax + cleanup item parsing.][68728]
2037 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2038 For example, you may now write:
2040 macro_rules! mac_trait {
2050 These are still rejected *semantically*, so you will likely receive an error but
2051 these changes can be seen and parsed by macros and
2052 conditional compilation.
2057 - [You can now pass multiple lint flags to rustc to override the previous
2058 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2059 everything in the `unused` lint group except `unused-variables` which
2060 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2061 everything in the `unused` lint group **including** `unused-variables` since
2062 the allow flag is specified before the deny flag (and therefore overridden).
2063 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2064 if they are available on `windows-gnu`.][67429]
2065 - [rustc now buffers errors/warnings printed in JSON.][69227]
2069 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2070 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2071 respectively.][69538] **Note** These conversions are only available when `N`
2073 - [You can now use associated constants on floats and integers directly, rather
2074 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2075 `f32::NAN` with no imports.
2076 - [`u8::is_ascii` is now `const`.][68984]
2077 - [`String` now implements `AsMut<str>`.][68742]
2078 - [Added the `primitive` module to `std` and `core`.][67637] This module
2079 reexports Rust's primitive types. This is mainly useful in macros
2080 where you want avoid these types being shadowed.
2081 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2082 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2086 - [`Once::is_completed`]
2091 - [`iter::once_with`]
2095 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2096 your environment.][cargo/7823]
2097 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2098 executable path when running integration tests or benchmarks.][cargo/7697]
2099 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2100 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2104 - [Certain checks in the `const_err` lint were deemed unrelated to const
2105 evaluation][69185], and have been moved to the `unconditional_panic` and
2106 `arithmetic_overflow` lints.
2111 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2112 has been a warning since 1.36.0.
2113 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2114 led to some instances being accepted, and now correctly emits a hard error.
2116 [69340]: https://github.com/rust-lang/rust/pull/69340
2120 These changes provide no direct user facing benefits, but represent significant
2121 improvements to the internals and overall performance of `rustc` and
2124 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2125 - [Improved how rustc generates drop code.][67332]
2126 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2127 - [traits: preallocate 2 Vecs of known initial size][69022]
2128 - [Avoid exponential behaviour when relating types][68772]
2129 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2130 - [Improve performance of coherence checks][68966]
2131 - [Deduplicate types in the generator witness][68672]
2132 - [Invert control in struct_lint_level.][68725]
2134 [67332]: https://github.com/rust-lang/rust/pull/67332/
2135 [67429]: https://github.com/rust-lang/rust/pull/67429/
2136 [67637]: https://github.com/rust-lang/rust/pull/67637/
2137 [67642]: https://github.com/rust-lang/rust/pull/67642/
2138 [67878]: https://github.com/rust-lang/rust/pull/67878/
2139 [67885]: https://github.com/rust-lang/rust/pull/67885/
2140 [68129]: https://github.com/rust-lang/rust/pull/68129/
2141 [68672]: https://github.com/rust-lang/rust/pull/68672/
2142 [68725]: https://github.com/rust-lang/rust/pull/68725/
2143 [68728]: https://github.com/rust-lang/rust/pull/68728/
2144 [68738]: https://github.com/rust-lang/rust/pull/68738/
2145 [68742]: https://github.com/rust-lang/rust/pull/68742/
2146 [68764]: https://github.com/rust-lang/rust/pull/68764/
2147 [68772]: https://github.com/rust-lang/rust/pull/68772/
2148 [68943]: https://github.com/rust-lang/rust/pull/68943/
2149 [68952]: https://github.com/rust-lang/rust/pull/68952/
2150 [68966]: https://github.com/rust-lang/rust/pull/68966/
2151 [68984]: https://github.com/rust-lang/rust/pull/68984/
2152 [69022]: https://github.com/rust-lang/rust/pull/69022/
2153 [69185]: https://github.com/rust-lang/rust/pull/69185/
2154 [69194]: https://github.com/rust-lang/rust/pull/69194/
2155 [69201]: https://github.com/rust-lang/rust/pull/69201/
2156 [69227]: https://github.com/rust-lang/rust/pull/69227/
2157 [69548]: https://github.com/rust-lang/rust/pull/69548/
2158 [69256]: https://github.com/rust-lang/rust/pull/69256/
2159 [69361]: https://github.com/rust-lang/rust/pull/69361/
2160 [69366]: https://github.com/rust-lang/rust/pull/69366/
2161 [69538]: https://github.com/rust-lang/rust/pull/69538/
2162 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2163 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2164 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2165 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2166 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2167 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2168 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2169 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2172 Version 1.42.0 (2020-03-12)
2173 ==========================
2177 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2179 fn foo(words: &[&str]) {
2181 ["Hello", "World", "!", ..] => println!("Hello World!"),
2182 ["Foo", "Bar", ..] => println!("Baz"),
2183 rest => println!("{:?}", rest),
2187 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2188 that you can create an enum that has the exact layout and ABI of the type
2190 - [You can now use outer attribute procedural macros on inline modules.][64273]
2191 - [There are some *syntax-only* changes:][67131]
2192 - `default` is syntactically allowed before items in `trait` definitions.
2193 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2194 leave out their bodies in favor of `;`.
2195 - Bounds on associated types in `impl`s are now syntactically allowed
2196 (e.g. `type Foo: Ord;`).
2197 - `...` (the C-variadic type) may occur syntactically directly as the type of
2198 any function parameter.
2200 These are still rejected *semantically*, so you will likely receive an error
2201 but these changes can be seen and parsed by procedural macros and
2202 conditional compilation.
2206 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2207 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2208 - [`Option::{expect,unwrap}` and
2209 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2210 pointing to the location where they were called, rather than
2211 `core`'s internals. ][67887]
2213 \* Refer to Rust's [platform support page][platform-support-doc] for more
2214 information on Rust's tiered platform support.
2218 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2219 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2220 to implement `Sized`.][67935]
2221 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2222 - [`Layout::new` is now `const`.][66254]
2223 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2228 - [`CondVar::wait_while`]
2229 - [`CondVar::wait_timeout_while`]
2231 - [`DebugMap::value`]
2232 - [`ManuallyDrop::take`]
2234 - [`ptr::slice_from_raw_parts_mut`]
2235 - [`ptr::slice_from_raw_parts`]
2239 - [You no longer need to include `extern crate proc_macro;` to be able to
2240 `use proc_macro;` in the `2018` edition.][cargo/7700]
2244 - [`Error::description` has been deprecated, and its use will now produce a
2245 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2247 [68253]: https://github.com/rust-lang/rust/pull/68253/
2248 [68348]: https://github.com/rust-lang/rust/pull/68348/
2249 [67935]: https://github.com/rust-lang/rust/pull/67935/
2250 [68339]: https://github.com/rust-lang/rust/pull/68339/
2251 [68122]: https://github.com/rust-lang/rust/pull/68122/
2252 [64273]: https://github.com/rust-lang/rust/pull/64273/
2253 [67712]: https://github.com/rust-lang/rust/pull/67712/
2254 [67887]: https://github.com/rust-lang/rust/pull/67887/
2255 [67131]: https://github.com/rust-lang/rust/pull/67131/
2256 [67233]: https://github.com/rust-lang/rust/pull/67233/
2257 [66899]: https://github.com/rust-lang/rust/pull/66899/
2258 [66919]: https://github.com/rust-lang/rust/pull/66919/
2259 [66254]: https://github.com/rust-lang/rust/pull/66254/
2260 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2261 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2262 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2263 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2264 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2265 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2266 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2267 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2268 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2271 Version 1.41.1 (2020-02-27)
2272 ===========================
2274 * [Always check types of static items][69145]
2275 * [Always check lifetime bounds of `Copy` impls][69145]
2276 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2278 [69225]: https://github.com/rust-lang/rust/issues/69225
2279 [69145]: https://github.com/rust-lang/rust/pull/69145
2282 Version 1.41.0 (2020-01-30)
2283 ===========================
2288 - [You can now pass type parameters to foreign items when implementing
2289 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2290 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2291 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2292 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2293 - [You can now use any valid identifier in a `format_args` macro.][66847]
2294 Previously identifiers starting with an underscore were not allowed.
2295 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2296 enum variants.][66183] These are still rejected semantically, but
2297 can be seen and parsed by procedural macros and conditional compilation.
2302 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2303 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2304 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2305 - [You can now pass an arguments file passing the `@path` syntax
2306 to rustc.][66172] Note that the format differs somewhat from what is
2307 found in other tooling; please see [the documentation][argfile-docs] for
2309 - [You can now provide `--extern` flag without a path, indicating that it is
2310 available from the search path or specified with an `-L` flag.][64882]
2312 \* Refer to Rust's [platform support page][platform-support-doc] for more
2313 information on Rust's tiered platform support.
2315 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2320 - [The `core::panic` module is now stable.][66771] It was already stable
2322 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2323 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2324 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2329 - [`Result::map_or`]
2330 - [`Result::map_or_else`]
2331 - [`std::rc::Weak::weak_count`]
2332 - [`std::rc::Weak::strong_count`]
2333 - [`std::sync::Weak::weak_count`]
2334 - [`std::sync::Weak::strong_count`]
2339 - [Cargo will now document all the private items for binary crates
2340 by default.][cargo/7593]
2341 - [`cargo-install` will now reinstall the package if it detects that it is out
2342 of date.][cargo/7560]
2343 - [Cargo.lock now uses a more git friendly format that should help to reduce
2344 merge conflicts.][cargo/7579]
2345 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2346 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2347 optimisation level to `2` for debug builds. You can also use
2348 `[profile.<profile>.build-override]` to override build scripts and
2354 - [You can now specify `edition` in documentation code blocks to compile the block
2355 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2356 should be compiled the 2018 edition of Rust.
2357 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2358 current theme with `--check-theme`.][54733]
2359 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2364 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2365 Apple targets.][apple-32bit-drop] This means that the source code is still
2366 available to build, but the targets are no longer being tested and release
2367 binaries for those platforms will no longer be distributed by the Rust project.
2368 Please refer to the linked blog post for more information.
2370 [54733]: https://github.com/rust-lang/rust/pull/54733/
2371 [61351]: https://github.com/rust-lang/rust/pull/61351/
2372 [67255]: https://github.com/rust-lang/rust/pull/67255/
2373 [66661]: https://github.com/rust-lang/rust/pull/66661/
2374 [66771]: https://github.com/rust-lang/rust/pull/66771/
2375 [66847]: https://github.com/rust-lang/rust/pull/66847/
2376 [66238]: https://github.com/rust-lang/rust/pull/66238/
2377 [66277]: https://github.com/rust-lang/rust/pull/66277/
2378 [66325]: https://github.com/rust-lang/rust/pull/66325/
2379 [66172]: https://github.com/rust-lang/rust/pull/66172/
2380 [66183]: https://github.com/rust-lang/rust/pull/66183/
2381 [65879]: https://github.com/rust-lang/rust/pull/65879/
2382 [65013]: https://github.com/rust-lang/rust/pull/65013/
2383 [64882]: https://github.com/rust-lang/rust/pull/64882/
2384 [64325]: https://github.com/rust-lang/rust/pull/64325/
2385 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2386 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2387 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2388 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2389 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2390 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2391 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2392 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2393 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2394 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2395 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2397 Version 1.40.0 (2019-12-19)
2398 ===========================
2402 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2403 `const` contexts.][65188] e.g.
2406 pub struct Point(i32, i32);
2408 const ORIGIN: Point = {
2409 let constructor = Point;
2415 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2416 indicate that there may be variants or fields added in the future.][64639]
2417 For example this requires adding a wild-card branch (`_ => {}`) to any match
2418 statements on a non-exhaustive `enum`. [(RFC 2008)]
2419 - [You can now use function-like procedural macros in `extern` blocks and in
2420 type positions.][63931] e.g. `type Generated = macro!();`
2421 - [Function-like and attribute procedural macros can now emit
2422 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2423 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2424 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2425 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2429 - [Added tier 3 support\* for the
2430 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2431 - [Added tier 3 support for the
2432 `aarch64-unknown-none-softfloat` target.][64589]
2433 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2434 `mips64el-unknown-linux-muslabi64` targets.][65843]
2436 \* Refer to Rust's [platform support page][platform-support-doc] for more
2437 information on Rust's tiered platform support.
2441 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2445 - [`BTreeMap::get_key_value`]
2446 - [`HashMap::get_key_value`]
2447 - [`Option::as_deref_mut`]
2448 - [`Option::as_deref`]
2449 - [`Option::flatten`]
2450 - [`UdpSocket::peer_addr`]
2451 - [`f32::to_be_bytes`]
2452 - [`f32::to_le_bytes`]
2453 - [`f32::to_ne_bytes`]
2454 - [`f64::to_be_bytes`]
2455 - [`f64::to_le_bytes`]
2456 - [`f64::to_ne_bytes`]
2457 - [`f32::from_be_bytes`]
2458 - [`f32::from_le_bytes`]
2459 - [`f32::from_ne_bytes`]
2460 - [`f64::from_be_bytes`]
2461 - [`f64::from_le_bytes`]
2462 - [`f64::from_ne_bytes`]
2469 - [Cargo will now always display warnings, rather than only on
2470 fresh builds.][cargo/7450]
2471 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2472 now produce an error.][cargo/7507] Previously these flags were ignored.
2473 - [You can now publish `dev-dependencies` without including
2474 a `version`.][cargo/7333]
2478 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2479 when running documentation tests with `rustdoc`.][63803]
2483 - [As previously announced, any previous NLL warnings in the 2015 edition are
2484 now hard errors.][64221]
2485 - [The `include!` macro will now warn if it failed to include the
2486 entire file.][64284] The `include!` macro unintentionally only includes the
2487 first _expression_ in a file, and this can be unintuitive. This will become
2488 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2489 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2490 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2491 or `extern` blocks now correctly emits a hard error.
2493 [65294]: https://github.com/rust-lang/rust/pull/65294/
2494 [66103]: https://github.com/rust-lang/rust/pull/66103/
2495 [65843]: https://github.com/rust-lang/rust/pull/65843/
2496 [65188]: https://github.com/rust-lang/rust/pull/65188/
2497 [65092]: https://github.com/rust-lang/rust/pull/65092/
2498 [64589]: https://github.com/rust-lang/rust/pull/64589/
2499 [64639]: https://github.com/rust-lang/rust/pull/64639/
2500 [64221]: https://github.com/rust-lang/rust/pull/64221/
2501 [64284]: https://github.com/rust-lang/rust/pull/64284/
2502 [63931]: https://github.com/rust-lang/rust/pull/63931/
2503 [64035]: https://github.com/rust-lang/rust/pull/64035/
2504 [63674]: https://github.com/rust-lang/rust/pull/63674/
2505 [63803]: https://github.com/rust-lang/rust/pull/63803/
2506 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2507 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2508 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2509 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2510 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2511 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2512 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2513 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2514 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2515 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2516 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2517 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2518 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2519 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2520 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2521 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2522 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2523 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2524 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2525 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2526 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2527 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2528 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2529 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2530 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2531 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2534 Version 1.39.0 (2019-11-07)
2535 ===========================
2539 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2540 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2541 - [You can now use certain attributes on function, closure, and function pointer
2542 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2543 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2544 attributes applied to items. e.g.
2547 #[cfg(windows)] slice: &[u16],
2548 #[cfg(not(windows))] slice: &[u8],
2553 - [You can now take shared references to bind-by-move patterns in the `if` guards
2554 of `match` arms.][63118] e.g.
2557 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2561 // ---- `nums` is bound by move.
2562 if nums.iter().sum::<u8>() == 10
2563 // ^------ `.iter()` implicitly takes a reference to `nums`.
2566 // ----------- Legal as `nums` was bound by move and so we have ownership.
2568 _ => unreachable!(),
2577 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2578 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2579 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2580 **Note** Cargo currently doesn't use this feature. Refer to
2581 [cargo#7315][cargo/7315] to track this feature's progress.
2582 - [You can now pass `--show-output` argument to test binaries to print the
2583 output of successful tests.][62600]
2586 \* Refer to Rust's [platform support page][platform-support-doc] for more
2587 information on Rust's tiered platform support.
2591 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2592 - [`LinkedList::new` is now a `const` function.][63684]
2593 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2594 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2595 now `const`.][63786]
2599 - [`Pin::into_inner`]
2600 - [`Instant::checked_duration_since`]
2601 - [`Instant::saturating_duration_since`]
2605 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2606 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2607 `--all` is now deprecated.
2611 - [You can now pass `-Clinker` to rustdoc to control the linker used
2612 for compiling doctests.][63834]
2616 - [Code that was previously accepted by the old borrow checker, but rejected by
2617 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2618 previously a warning, and will also become a hard error in the Rust 2015
2619 edition in the 1.40.0 release.
2620 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2621 run tests.][63827] This should improve performance when running a large
2623 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2624 recommended to use the `?` operator instead.
2625 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2628 [62600]: https://github.com/rust-lang/rust/pull/62600/
2629 [62672]: https://github.com/rust-lang/rust/pull/62672/
2630 [63118]: https://github.com/rust-lang/rust/pull/63118/
2631 [63209]: https://github.com/rust-lang/rust/pull/63209/
2632 [63402]: https://github.com/rust-lang/rust/pull/63402/
2633 [63565]: https://github.com/rust-lang/rust/pull/63565/
2634 [63595]: https://github.com/rust-lang/rust/pull/63595/
2635 [63684]: https://github.com/rust-lang/rust/pull/63684/
2636 [63698]: https://github.com/rust-lang/rust/pull/63698/
2637 [63770]: https://github.com/rust-lang/rust/pull/63770/
2638 [63786]: https://github.com/rust-lang/rust/pull/63786/
2639 [63827]: https://github.com/rust-lang/rust/pull/63827/
2640 [63834]: https://github.com/rust-lang/rust/pull/63834/
2641 [63927]: https://github.com/rust-lang/rust/pull/63927/
2642 [63933]: https://github.com/rust-lang/rust/pull/63933/
2643 [63934]: https://github.com/rust-lang/rust/pull/63934/
2644 [63938]: https://github.com/rust-lang/rust/pull/63938/
2645 [63940]: https://github.com/rust-lang/rust/pull/63940/
2646 [63941]: https://github.com/rust-lang/rust/pull/63941/
2647 [63945]: https://github.com/rust-lang/rust/pull/63945/
2648 [64010]: https://github.com/rust-lang/rust/pull/64010/
2649 [64028]: https://github.com/rust-lang/rust/pull/64028/
2650 [64334]: https://github.com/rust-lang/rust/pull/64334/
2651 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2652 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2653 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2654 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2655 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2656 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2658 Version 1.38.0 (2019-09-26)
2659 ==========================
2663 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2664 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2668 - [Added pipelined compilation support to `rustc`.][62766] This will
2669 improve compilation times in some cases. For further information please refer
2670 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2671 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2672 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2673 `x86_64-uwp-windows-msvc` targets.][60260]
2674 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2675 `armv7-unknown-linux-musleabi` targets.][63107]
2676 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2677 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2678 - [Upgraded to LLVM 9.][62592]
2680 \* Refer to Rust's [platform support page][platform-support-doc] for more
2681 information on Rust's tiered platform support.
2685 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2686 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2687 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2688 is available at `std::clone::Clone`). This also makes all built-in macros
2689 available in `std`/`core` root. e.g. `std::include_bytes!`.
2690 - [`str::Chars` now implements `Debug`.][63000]
2691 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2692 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2693 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2694 - [Added euclidean remainder and division operations (`div_euclid`,
2695 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2696 `overflowing`, and `wrapping` versions are available for all
2698 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2699 `PartialEq`.][61491]
2700 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2704 - [`<*const T>::cast`]
2705 - [`<*mut T>::cast`]
2706 - [`Duration::as_secs_f32`]
2707 - [`Duration::as_secs_f64`]
2708 - [`Duration::div_f32`]
2709 - [`Duration::div_f64`]
2710 - [`Duration::from_secs_f32`]
2711 - [`Duration::from_secs_f64`]
2712 - [`Duration::mul_f32`]
2713 - [`Duration::mul_f64`]
2714 - [`any::type_name`]
2718 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2719 - [You can now pass the `--features` option multiple times to enable
2720 multiple features.][cargo/7084]
2725 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2729 - [`rustc` will now warn about some incorrect uses of
2730 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2734 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2736 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2737 issues][62896] with certain crates such as libc.
2739 [60260]: https://github.com/rust-lang/rust/pull/60260/
2740 [61457]: https://github.com/rust-lang/rust/pull/61457/
2741 [61491]: https://github.com/rust-lang/rust/pull/61491/
2742 [61884]: https://github.com/rust-lang/rust/pull/61884/
2743 [61953]: https://github.com/rust-lang/rust/pull/61953/
2744 [62042]: https://github.com/rust-lang/rust/pull/62042/
2745 [62528]: https://github.com/rust-lang/rust/pull/62528/
2746 [62583]: https://github.com/rust-lang/rust/pull/62583/
2747 [62735]: https://github.com/rust-lang/rust/pull/62735/
2748 [62766]: https://github.com/rust-lang/rust/pull/62766/
2749 [62784]: https://github.com/rust-lang/rust/pull/62784/
2750 [62592]: https://github.com/rust-lang/rust/pull/62592/
2751 [62785]: https://github.com/rust-lang/rust/issues/62785/
2752 [62814]: https://github.com/rust-lang/rust/pull/62814/
2753 [62896]: https://github.com/rust-lang/rust/issues/62896/
2754 [63000]: https://github.com/rust-lang/rust/pull/63000/
2755 [63056]: https://github.com/rust-lang/rust/pull/63056/
2756 [63107]: https://github.com/rust-lang/rust/pull/63107/
2757 [63346]: https://github.com/rust-lang/rust/pull/63346/
2758 [63421]: https://github.com/rust-lang/rust/pull/63421/
2759 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2760 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2761 [63048]: https://github.com/rust-lang/rust/pull/63048
2762 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2763 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2764 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2765 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2766 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2767 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2768 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2769 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2770 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2771 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2772 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2773 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2774 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2776 Version 1.37.0 (2019-08-15)
2777 ==========================
2781 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2782 [`Box`][62228], or an [array][62235] and unused.
2783 - [You can now use the `cfg` and `cfg_attr` attributes on
2784 generic parameters.][61547]
2785 - [You can now use enum variants through type alias.][61682] e.g. You can
2786 write the following:
2788 type MyOption = Option<u8>;
2790 fn increment_or_zero(x: MyOption) -> u8 {
2792 MyOption::Some(y) => y + 1,
2793 MyOption::None => 0,
2797 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2798 `const _: u32 = 5;`.
2799 - [You can now use `#[repr(align(X)]` on enums.][61229]
2800 - [The `?` Kleene macro operator is now available in the
2801 2015 edition.][60932]
2805 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2806 and `-C profile-use` flags.][61268] For more information on how to use profile
2807 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2808 - [The `rust-lldb` wrapper script should now work again.][61827]
2812 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2816 - [`BufReader::buffer`]
2817 - [`BufWriter::buffer`]
2818 - [`Cell::from_mut`]
2819 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2820 - [`DoubleEndedIterator::nth_back`]
2822 - [`Wrapping::reverse_bits`]
2823 - [`i128::reverse_bits`]
2824 - [`i16::reverse_bits`]
2825 - [`i32::reverse_bits`]
2826 - [`i64::reverse_bits`]
2827 - [`i8::reverse_bits`]
2828 - [`isize::reverse_bits`]
2829 - [`slice::copy_within`]
2830 - [`u128::reverse_bits`]
2831 - [`u16::reverse_bits`]
2832 - [`u32::reverse_bits`]
2833 - [`u64::reverse_bits`]
2834 - [`u8::reverse_bits`]
2835 - [`usize::reverse_bits`]
2839 - [`Cargo.lock` files are now included by default when publishing executable crates
2840 with executables.][cargo/7026]
2841 - [You can now specify `default-run="foo"` in `[package]` to specify the
2842 default executable to use for `cargo run`.][cargo/7056]
2849 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2850 Please transition your code to using the `..=` syntax for inclusive
2852 - [Using a trait object without the `dyn` will now warn by default.][61203]
2853 Please transition your code to use `dyn Trait` for trait objects instead.
2855 [62228]: https://github.com/rust-lang/rust/pull/62228/
2856 [62235]: https://github.com/rust-lang/rust/pull/62235/
2857 [61802]: https://github.com/rust-lang/rust/pull/61802/
2858 [61827]: https://github.com/rust-lang/rust/pull/61827/
2859 [61547]: https://github.com/rust-lang/rust/pull/61547/
2860 [61682]: https://github.com/rust-lang/rust/pull/61682/
2861 [61268]: https://github.com/rust-lang/rust/pull/61268/
2862 [61342]: https://github.com/rust-lang/rust/pull/61342/
2863 [61347]: https://github.com/rust-lang/rust/pull/61347/
2864 [61100]: https://github.com/rust-lang/rust/pull/61100/
2865 [61203]: https://github.com/rust-lang/rust/pull/61203/
2866 [61229]: https://github.com/rust-lang/rust/pull/61229/
2867 [60932]: https://github.com/rust-lang/rust/pull/60932/
2868 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2869 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2870 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2871 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2872 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2873 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2874 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2875 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2876 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2877 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2878 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2879 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2880 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2881 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2882 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2883 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2884 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2885 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2886 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2887 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2888 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2889 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2890 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2891 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2894 Version 1.36.0 (2019-07-04)
2895 ==========================
2899 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2900 - [The order of traits in trait objects no longer affects the semantics of that
2901 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2902 `dyn fmt::Debug + Send`, where this was previously not the case.
2906 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2907 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2908 - [`mem::needs_drop` is now available as a const fn.][60364]
2909 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2910 - [`String` now implements `BorrowMut<str>`.][60404]
2911 - [`io::Cursor` now implements `Default`.][60234]
2912 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2913 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2914 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2915 environment has access to heap memory allocation.
2916 - [`String` now implements `From<&String>`.][59825]
2917 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2918 return a tuple of each argument when there is multiple arguments.
2919 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2924 - [`VecDeque::rotate_left`]
2925 - [`VecDeque::rotate_right`]
2926 - [`Iterator::copied`]
2928 - [`io::IoSliceMut`]
2929 - [`Read::read_vectored`]
2930 - [`Write::write_vectored`]
2931 - [`str::as_mut_ptr`]
2932 - [`mem::MaybeUninit`]
2933 - [`pointer::align_offset`]
2934 - [`future::Future`]
2936 - [`task::RawWaker`]
2937 - [`task::RawWakerVTable`]
2943 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2944 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2946 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2950 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2957 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2958 longer recommended, and will be deprecated in 1.39.0.
2960 [60318]: https://github.com/rust-lang/rust/pull/60318/
2961 [60364]: https://github.com/rust-lang/rust/pull/60364/
2962 [60370]: https://github.com/rust-lang/rust/pull/60370/
2963 [60404]: https://github.com/rust-lang/rust/pull/60404/
2964 [60234]: https://github.com/rust-lang/rust/pull/60234/
2965 [60244]: https://github.com/rust-lang/rust/pull/60244/
2966 [58623]: https://github.com/rust-lang/rust/pull/58623/
2967 [59648]: https://github.com/rust-lang/rust/pull/59648/
2968 [59675]: https://github.com/rust-lang/rust/pull/59675/
2969 [59825]: https://github.com/rust-lang/rust/pull/59825/
2970 [59826]: https://github.com/rust-lang/rust/pull/59826/
2971 [59445]: https://github.com/rust-lang/rust/pull/59445/
2972 [59114]: https://github.com/rust-lang/rust/pull/59114/
2973 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2974 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2975 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2976 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2977 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2978 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2979 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2980 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2981 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2982 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2983 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2984 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2985 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2986 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2987 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2988 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2989 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2990 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2991 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2992 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2995 Version 1.35.0 (2019-05-23)
2996 ==========================
3000 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3001 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3002 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3004 unsafe fn call_unsafe(func: unsafe fn()) {
3009 unsafe { call_unsafe(|| {}); }
3016 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3017 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3018 - [Added the `wasm32-unknown-wasi` target.][59464]
3023 - [`Thread` will now show its ID in `Debug` output.][59460]
3024 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3025 - [`alloc::System` now implements `Default`.][59451]
3026 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3028 - [`char::{ToLowercase, ToUppercase}` now
3029 implement `ExactSizeIterator`.][58778]
3030 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3031 - [Removed the `Read` trait bounds
3032 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3033 - [You can now call the `dbg!` macro without any parameters to print the file
3034 and line where it is called.][57847]
3035 - [In place ASCII case conversions are now up to 4× faster.][59283]
3036 e.g. `str::make_ascii_lowercase`
3037 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3044 - [`RefCell::replace_with`]
3045 - [`RefCell::map_split`]
3047 - [`Range::contains`]
3048 - [`RangeFrom::contains`]
3049 - [`RangeTo::contains`]
3050 - [`RangeInclusive::contains`]
3051 - [`RangeToInclusive::contains`]
3052 - [`Option::copied`]
3056 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3057 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3062 - [The Rust toolchain is now available natively for musl based distros.][58575]
3064 [59460]: https://github.com/rust-lang/rust/pull/59460/
3065 [59464]: https://github.com/rust-lang/rust/pull/59464/
3066 [59500]: https://github.com/rust-lang/rust/pull/59500/
3067 [59512]: https://github.com/rust-lang/rust/pull/59512/
3068 [59580]: https://github.com/rust-lang/rust/pull/59580/
3069 [59283]: https://github.com/rust-lang/rust/pull/59283/
3070 [59451]: https://github.com/rust-lang/rust/pull/59451/
3071 [59076]: https://github.com/rust-lang/rust/pull/59076/
3072 [58778]: https://github.com/rust-lang/rust/pull/58778/
3073 [58717]: https://github.com/rust-lang/rust/pull/58717/
3074 [58369]: https://github.com/rust-lang/rust/pull/58369/
3075 [58423]: https://github.com/rust-lang/rust/pull/58423/
3076 [58080]: https://github.com/rust-lang/rust/pull/58080/
3077 [57847]: https://github.com/rust-lang/rust/pull/57847/
3078 [58575]: https://github.com/rust-lang/rust/pull/58575
3079 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3080 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3081 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3082 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3083 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3084 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3085 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3086 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3087 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3088 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3089 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3090 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3092 Version 1.34.2 (2019-05-14)
3093 ===========================
3095 * [Destabilize the `Error::type_id` function due to a security
3096 vulnerability][60785] ([CVE-2019-12083])
3098 [60785]: https://github.com/rust-lang/rust/pull/60785
3099 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3101 Version 1.34.1 (2019-04-25)
3102 ===========================
3104 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3105 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3106 * [Fix Clippy panic when checking some macros][clippy/3805]
3108 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3109 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3110 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3112 Version 1.34.0 (2019-04-11)
3113 ==========================
3117 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3118 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3120 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3121 `#[attr{}]` procedural macros.][57367]
3122 - [You can now write `extern crate self as foo;`][57407] to import your
3123 crate's root into the extern prelude.
3128 - [You can now target `riscv64imac-unknown-none-elf` and
3129 `riscv64gc-unknown-none-elf`.][58406]
3130 - [You can now enable linker plugin LTO optimisations with
3131 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3132 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3134 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3139 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3140 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3141 the `Hash` trait to create an iterator.
3142 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3143 methods.][58421] Most notably you no longer require the `Ord` trait to create
3145 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3146 for all numeric types.][58044]
3147 - [Indexing a `str` is now generic over all types that
3148 implement `SliceIndex<str>`.][57604]
3149 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3150 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3151 produce a warning if their returning type is unused.
3152 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3153 `overflowing_pow` are now available for all numeric types.][57873] These are
3154 equivalent to methods such as `wrapping_add` for the `pow` operation.
3162 * [`Error::type_id`]
3163 * [`atomic::AtomicI16`]
3164 * [`atomic::AtomicI32`]
3165 * [`atomic::AtomicI64`]
3166 * [`atomic::AtomicI8`]
3167 * [`atomic::AtomicU16`]
3168 * [`atomic::AtomicU32`]
3169 * [`atomic::AtomicU64`]
3170 * [`atomic::AtomicU8`]
3171 * [`convert::Infallible`]
3172 * [`convert::TryFrom`]
3173 * [`convert::TryInto`]
3175 * [`iter::successors`]
3176 * [`num::NonZeroI128`]
3177 * [`num::NonZeroI16`]
3178 * [`num::NonZeroI32`]
3179 * [`num::NonZeroI64`]
3180 * [`num::NonZeroI8`]
3181 * [`num::NonZeroIsize`]
3182 * [`slice::sort_by_cached_key`]
3183 * [`str::escape_debug`]
3184 * [`str::escape_default`]
3185 * [`str::escape_unicode`]
3186 * [`str::split_ascii_whitespace`]
3189 * [`Instant::checked_add`]
3190 * [`Instant::checked_sub`]
3191 * [`SystemTime::checked_add`]
3192 * [`SystemTime::checked_sub`]
3196 - [You can now use alternative registries to crates.io.][cargo/6654]
3200 - [You can now use the `?` operator in your documentation tests without manually
3201 adding `fn main() -> Result<(), _> {}`.][56470]
3205 - [`Command::before_exec` is being replaced by the unsafe method
3206 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3207 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3208 can now use `const` functions in `static` variables.
3210 [58370]: https://github.com/rust-lang/rust/pull/58370/
3211 [58406]: https://github.com/rust-lang/rust/pull/58406/
3212 [58421]: https://github.com/rust-lang/rust/pull/58421/
3213 [58166]: https://github.com/rust-lang/rust/pull/58166/
3214 [58044]: https://github.com/rust-lang/rust/pull/58044/
3215 [58057]: https://github.com/rust-lang/rust/pull/58057/
3216 [58059]: https://github.com/rust-lang/rust/pull/58059/
3217 [57809]: https://github.com/rust-lang/rust/pull/57809/
3218 [57873]: https://github.com/rust-lang/rust/pull/57873/
3219 [57604]: https://github.com/rust-lang/rust/pull/57604/
3220 [57367]: https://github.com/rust-lang/rust/pull/57367/
3221 [57407]: https://github.com/rust-lang/rust/pull/57407/
3222 [57425]: https://github.com/rust-lang/rust/pull/57425/
3223 [57106]: https://github.com/rust-lang/rust/pull/57106/
3224 [56470]: https://github.com/rust-lang/rust/pull/56470/
3225 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3226 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3227 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3228 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3229 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3230 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3231 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3232 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3233 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3234 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3235 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3236 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3237 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3238 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3239 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3240 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3241 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3242 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3243 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3244 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3245 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3246 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3247 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3248 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3249 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3250 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3251 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3252 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3253 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3254 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3255 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3258 Version 1.33.0 (2019-02-28)
3259 ==========================
3263 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3264 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3265 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3266 E.g. You can have match statement on a `u8` that covers `0..=255` and
3267 you would no longer be required to have a `_ => unreachable!()` case.
3268 - [You can now have multiple patterns in `if let` and `while let`
3269 expressions.][57532] You can do this with the same syntax as a `match`
3279 let state = Creature::Crab("Ferris");
3281 if let Creature::Crab(name) | Creature::Person(name) = state {
3282 println!("This creature's name is: {}", name);
3286 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3287 this feature will by default produce a warning as this behaviour can be
3288 unintuitive. E.g. `if let _ = 5 {}`
3289 - [You can now use `let` bindings, assignments, expression statements,
3290 and irrefutable pattern destructuring in const functions.][57175]
3291 - [You can now call unsafe const functions.][57067] E.g.
3293 const unsafe fn foo() -> i32 { 5 }
3294 const fn bar() -> i32 {
3298 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3299 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3300 - [You can now specify a specific alignment with the `#[repr(packed)]`
3301 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3302 with an alignment of 2 bytes and a size of 6 bytes.
3303 - [You can now import an item from a module as an `_`.][56303] This allows you to
3304 import a trait's impls, and not have the name in the namespace. E.g.
3306 use std::io::Read as _;
3308 // Allowed as there is only one `Read` in the module.
3311 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3315 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3316 command line argument.][56351]
3317 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3318 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3319 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3320 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3321 information on Rust's platform support.
3322 - [Added support for the `thumbv7neon-linux-androideabi` and
3323 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3324 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3328 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3329 functions for all numeric types.][57566]
3330 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3331 are now `const` functions for all numeric types.][57105]
3332 - [The methods `is_positive` and `is_negative` are now `const` functions for
3333 all signed numeric types.][57105]
3334 - [The `get` method for all `NonZero` types is now `const`.][57167]
3335 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3336 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3337 numeric types.][57234]
3338 - [`Ipv4Addr::new` is now a `const` function][57234]
3342 - [`unix::FileExt::read_exact_at`]
3343 - [`unix::FileExt::write_all_at`]
3344 - [`Option::transpose`]
3345 - [`Result::transpose`]
3346 - [`convert::identity`]
3349 - [`marker::PhantomPinned`]
3350 - [`Vec::resize_with`]
3351 - [`VecDeque::resize_with`]
3352 - [`Duration::as_millis`]
3353 - [`Duration::as_micros`]
3354 - [`Duration::as_nanos`]
3359 - [You can now publish crates that require a feature flag to compile with
3360 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3361 - [Cargo should now rebuild a crate if a file was modified during the initial
3366 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3367 are now deprecated in the standard library, and their usage will now produce a warning.
3368 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3370 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3372 - [Libtest no longer creates a new thread for each test when
3373 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3375 [55982]: https://github.com/rust-lang/rust/pull/55982/
3376 [56243]: https://github.com/rust-lang/rust/pull/56243
3377 [56303]: https://github.com/rust-lang/rust/pull/56303/
3378 [56351]: https://github.com/rust-lang/rust/pull/56351/
3379 [56362]: https://github.com/rust-lang/rust/pull/56362
3380 [56642]: https://github.com/rust-lang/rust/pull/56642/
3381 [56769]: https://github.com/rust-lang/rust/pull/56769/
3382 [56805]: https://github.com/rust-lang/rust/pull/56805
3383 [56947]: https://github.com/rust-lang/rust/pull/56947/
3384 [57049]: https://github.com/rust-lang/rust/pull/57049/
3385 [57067]: https://github.com/rust-lang/rust/pull/57067/
3386 [57105]: https://github.com/rust-lang/rust/pull/57105
3387 [57130]: https://github.com/rust-lang/rust/pull/57130/
3388 [57167]: https://github.com/rust-lang/rust/pull/57167/
3389 [57175]: https://github.com/rust-lang/rust/pull/57175/
3390 [57234]: https://github.com/rust-lang/rust/pull/57234/
3391 [57332]: https://github.com/rust-lang/rust/pull/57332/
3392 [57465]: https://github.com/rust-lang/rust/pull/57465/
3393 [57532]: https://github.com/rust-lang/rust/pull/57532/
3394 [57535]: https://github.com/rust-lang/rust/pull/57535/
3395 [57566]: https://github.com/rust-lang/rust/pull/57566/
3396 [57615]: https://github.com/rust-lang/rust/pull/57615/
3397 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3398 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3399 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3400 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3401 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3402 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3403 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3404 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3405 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3406 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3407 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3408 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3409 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3410 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3411 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3412 [platform-support]: https://forge.rust-lang.org/platform-support.html
3414 Version 1.32.0 (2019-01-17)
3415 ==========================
3420 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3421 operator allows you to specify zero or one repetitions similar to the `*` and
3423 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3424 now always resolve to the item (`enum`, `struct`, etc.) available in the
3425 module if present, before resolving to a external crate or an item the prelude.][56759]
3428 enum Color { Red, Green, Blue }
3434 - [You can now match against `PhantomData<T>` types.][55837]
3435 - [You can now match against literals in macros with the `literal`
3436 specifier.][56072] This will match against a literal of any type.
3437 E.g. `1`, `'A'`, `"Hello World"`
3438 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3440 struct Point(i32, i32);
3443 pub fn new(x: i32, y: i32) -> Self {
3447 pub fn is_origin(&self) -> bool {
3455 - [Self can also now be used in type definitions.][56366] E.g.
3459 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3462 Cons(T, Box<Self>) // likewise here
3465 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3466 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3470 - [The default allocator has changed from jemalloc to the default allocator on
3471 your system.][55238] The compiler itself on Linux & macOS will still use
3472 jemalloc, but programs compiled with it will use the system allocator.
3473 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3477 - [`PathBuf` now implements `FromStr`.][55148]
3478 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3479 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3480 easily debug expressions in your rust program. E.g.
3483 let b = dbg!(a * 2) + 1;
3484 // ^-- prints: [src/main.rs:4] a * 2 = 4
3488 The following APIs are now `const` functions and can be used in a
3492 - [`UnsafeCell::get`]
3493 - [`char::is_ascii`]
3495 - [`ManuallyDrop::new`]
3496 - [`ManuallyDrop::into_inner`]
3497 - [`RangeInclusive::start`]
3498 - [`RangeInclusive::end`]
3499 - [`NonNull::as_ptr`]
3502 - [`Duration::as_secs`]
3503 - [`Duration::subsec_millis`]
3504 - [`Duration::subsec_micros`]
3505 - [`Duration::subsec_nanos`]
3507 - [`Ipv4Addr::is_unspecified`]
3509 - [`Ipv6Addr::octets`]
3513 - [`i8::to_be_bytes`]
3514 - [`i8::to_le_bytes`]
3515 - [`i8::to_ne_bytes`]
3516 - [`i8::from_be_bytes`]
3517 - [`i8::from_le_bytes`]
3518 - [`i8::from_ne_bytes`]
3519 - [`i16::to_be_bytes`]
3520 - [`i16::to_le_bytes`]
3521 - [`i16::to_ne_bytes`]
3522 - [`i16::from_be_bytes`]
3523 - [`i16::from_le_bytes`]
3524 - [`i16::from_ne_bytes`]
3525 - [`i32::to_be_bytes`]
3526 - [`i32::to_le_bytes`]
3527 - [`i32::to_ne_bytes`]
3528 - [`i32::from_be_bytes`]
3529 - [`i32::from_le_bytes`]
3530 - [`i32::from_ne_bytes`]
3531 - [`i64::to_be_bytes`]
3532 - [`i64::to_le_bytes`]
3533 - [`i64::to_ne_bytes`]
3534 - [`i64::from_be_bytes`]
3535 - [`i64::from_le_bytes`]
3536 - [`i64::from_ne_bytes`]
3537 - [`i128::to_be_bytes`]
3538 - [`i128::to_le_bytes`]
3539 - [`i128::to_ne_bytes`]
3540 - [`i128::from_be_bytes`]
3541 - [`i128::from_le_bytes`]
3542 - [`i128::from_ne_bytes`]
3543 - [`isize::to_be_bytes`]
3544 - [`isize::to_le_bytes`]
3545 - [`isize::to_ne_bytes`]
3546 - [`isize::from_be_bytes`]
3547 - [`isize::from_le_bytes`]
3548 - [`isize::from_ne_bytes`]
3549 - [`u8::to_be_bytes`]
3550 - [`u8::to_le_bytes`]
3551 - [`u8::to_ne_bytes`]
3552 - [`u8::from_be_bytes`]
3553 - [`u8::from_le_bytes`]
3554 - [`u8::from_ne_bytes`]
3555 - [`u16::to_be_bytes`]
3556 - [`u16::to_le_bytes`]
3557 - [`u16::to_ne_bytes`]
3558 - [`u16::from_be_bytes`]
3559 - [`u16::from_le_bytes`]
3560 - [`u16::from_ne_bytes`]
3561 - [`u32::to_be_bytes`]
3562 - [`u32::to_le_bytes`]
3563 - [`u32::to_ne_bytes`]
3564 - [`u32::from_be_bytes`]
3565 - [`u32::from_le_bytes`]
3566 - [`u32::from_ne_bytes`]
3567 - [`u64::to_be_bytes`]
3568 - [`u64::to_le_bytes`]
3569 - [`u64::to_ne_bytes`]
3570 - [`u64::from_be_bytes`]
3571 - [`u64::from_le_bytes`]
3572 - [`u64::from_ne_bytes`]
3573 - [`u128::to_be_bytes`]
3574 - [`u128::to_le_bytes`]
3575 - [`u128::to_ne_bytes`]
3576 - [`u128::from_be_bytes`]
3577 - [`u128::from_le_bytes`]
3578 - [`u128::from_ne_bytes`]
3579 - [`usize::to_be_bytes`]
3580 - [`usize::to_le_bytes`]
3581 - [`usize::to_ne_bytes`]
3582 - [`usize::from_be_bytes`]
3583 - [`usize::from_le_bytes`]
3584 - [`usize::from_ne_bytes`]
3588 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3589 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3593 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3597 - [The argument types for AVX's
3598 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3599 been changed from `*const` to `*mut` as the previous implementation
3603 [55148]: https://github.com/rust-lang/rust/pull/55148/
3604 [55238]: https://github.com/rust-lang/rust/pull/55238/
3605 [55280]: https://github.com/rust-lang/rust/pull/55280/
3606 [55610]: https://github.com/rust-lang/rust/pull/55610/
3607 [55663]: https://github.com/rust-lang/rust/pull/55663/
3608 [55702]: https://github.com/rust-lang/rust/pull/55702/
3609 [55837]: https://github.com/rust-lang/rust/pull/55837/
3610 [55843]: https://github.com/rust-lang/rust/pull/55843/
3611 [56072]: https://github.com/rust-lang/rust/pull/56072/
3612 [56245]: https://github.com/rust-lang/rust/pull/56245/
3613 [56365]: https://github.com/rust-lang/rust/pull/56365/
3614 [56366]: https://github.com/rust-lang/rust/pull/56366/
3615 [56395]: https://github.com/rust-lang/rust/pull/56395/
3616 [56759]: https://github.com/rust-lang/rust/pull/56759/
3617 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3618 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3619 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3620 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3621 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3622 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3623 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3624 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3625 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3626 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3627 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3628 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3629 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3630 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3631 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3632 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3633 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3634 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3635 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3636 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3637 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3638 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3639 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3640 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3641 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3642 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3643 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3644 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3645 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3646 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3647 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3648 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3649 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3650 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3651 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3652 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3653 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3654 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3655 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3656 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3657 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3658 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3659 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3660 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3661 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3662 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3663 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3664 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3665 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3666 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3667 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3668 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3669 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3670 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3671 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3672 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3673 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3674 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3675 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3676 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3677 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3678 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3679 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3680 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3681 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3682 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3683 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3684 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3685 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3686 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3687 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3688 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3689 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3690 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3691 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3692 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3693 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3694 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3695 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3696 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3697 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3698 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3699 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3700 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3701 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3702 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3703 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3704 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3705 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3706 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3707 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3708 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3709 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3712 Version 1.31.1 (2018-12-20)
3713 ===========================
3715 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3716 - [Fix broken go-to-definition in RLS][rls/1171]
3717 - [Fix infinite loop on hover in RLS][rls/1170]
3719 [56562]: https://github.com/rust-lang/rust/pull/56562
3720 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3721 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3723 Version 1.31.0 (2018-12-06)
3724 ==========================
3728 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3729 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3730 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3731 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3733 - [You can now define and use `const` functions.][54835] These are currently
3734 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3735 [language reference][const-reference] for what exactly is available.
3736 - [You can now use tool lints, which allow you to scope lints from external
3737 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3738 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3739 a crate, not just in exported functions.][54451]
3740 - [You can now use parentheses in pattern matches.][54497]
3744 - [Updated musl to 1.1.20][54430]
3748 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3749 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3750 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3751 into `Option<&mut T>` using the `From` trait.][53218]
3752 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3757 - [`slice::align_to`]
3758 - [`slice::align_to_mut`]
3759 - [`slice::chunks_exact`]
3760 - [`slice::chunks_exact_mut`]
3761 - [`slice::rchunks`]
3762 - [`slice::rchunks_mut`]
3763 - [`slice::rchunks_exact`]
3764 - [`slice::rchunks_exact_mut`]
3765 - [`Option::replace`]
3769 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3770 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3771 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3773 [52813]: https://github.com/rust-lang/rust/pull/52813/
3774 [53218]: https://github.com/rust-lang/rust/pull/53218/
3775 [53555]: https://github.com/rust-lang/rust/issues/53555/
3776 [54057]: https://github.com/rust-lang/rust/pull/54057/
3777 [54240]: https://github.com/rust-lang/rust/pull/54240/
3778 [54430]: https://github.com/rust-lang/rust/pull/54430/
3779 [54451]: https://github.com/rust-lang/rust/pull/54451/
3780 [54497]: https://github.com/rust-lang/rust/pull/54497/
3781 [54778]: https://github.com/rust-lang/rust/pull/54778/
3782 [54835]: https://github.com/rust-lang/rust/pull/54835/
3783 [54870]: https://github.com/rust-lang/rust/pull/54870/
3784 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3785 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3786 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3787 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3788 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3789 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3790 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3791 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3792 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3793 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3794 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3795 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3796 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3797 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3799 Version 1.30.1 (2018-11-08)
3800 ===========================
3802 - [Fixed overflow ICE in rustdoc][54199]
3803 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3805 [54199]: https://github.com/rust-lang/rust/pull/54199
3806 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3808 Version 1.30.0 (2018-10-25)
3809 ==========================
3813 - [Procedural macros are now available.][52081] These kinds of macros allow for
3814 more powerful code generation. There is a [new chapter available][proc-macros]
3815 in the Rust Programming Language book that goes further in depth.
3816 - [You can now use keywords as identifiers using the raw identifiers
3817 syntax (`r#`),][53236] e.g. `let r#for = true;`
3818 - [Using anonymous parameters in traits is now deprecated with a warning and
3819 will be a hard error in the 2018 edition.][53272]
3820 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3821 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3822 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3823 Previously, using a external crate in a module without a use statement
3824 required `let json = ::serde_json::from_str(foo);` but can now be written
3825 as `let json = serde_json::from_str(foo);`.
3826 - [You can now apply the `#[used]` attribute to static items to prevent the
3827 compiler from optimising them away, even if they appear to be unused,][51363]
3828 e.g. `#[used] static FOO: u32 = 1;`
3829 - [You can now import and reexport macros from other crates with the `use`
3830 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3831 the root module of the crate. If your macro relies on calling other local
3832 macros, it is recommended to export with the
3833 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3835 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3836 using the `vis` specifier.][53370]
3837 - [Non-macro attributes now allow all forms of literals, not just
3838 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3839 write `#[attr(true)]`.
3840 - [You can now specify a function to handle a panic in the Rust runtime with the
3841 `#[panic_handler]` attribute.][51366]
3845 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3846 - [Added the `aarch64-unknown-netbsd` target][53165]
3847 - [Upgraded to LLVM 8.][53611]
3851 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3855 - [`Ipv4Addr::BROADCAST`]
3856 - [`Ipv4Addr::LOCALHOST`]
3857 - [`Ipv4Addr::UNSPECIFIED`]
3858 - [`Ipv6Addr::LOCALHOST`]
3859 - [`Ipv6Addr::UNSPECIFIED`]
3860 - [`Iterator::find_map`]
3862 The following methods are replacement methods for `trim_left`, `trim_right`,
3863 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3865 - [`str::trim_end_matches`]
3867 - [`str::trim_start_matches`]
3868 - [`str::trim_start`]
3872 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3873 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3874 equivalent to calling `rustdoc --error-format=json`.
3875 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3879 - [`rustdoc` allows you to specify what edition to treat your code as with the
3880 `--edition` option.][54057]
3881 - [`rustdoc` now has the `--color` (specify whether to output color) and
3882 `--error-format` (specify error format, e.g. `json`) options.][53003]
3883 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3884 debug symbols.][53774]
3885 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3886 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3888 [50911]: https://github.com/rust-lang/rust/pull/50911/
3889 [51363]: https://github.com/rust-lang/rust/pull/51363/
3890 [51366]: https://github.com/rust-lang/rust/pull/51366/
3891 [52081]: https://github.com/rust-lang/rust/pull/52081/
3892 [53003]: https://github.com/rust-lang/rust/pull/53003/
3893 [53033]: https://github.com/rust-lang/rust/pull/53033/
3894 [53044]: https://github.com/rust-lang/rust/pull/53044/
3895 [53165]: https://github.com/rust-lang/rust/pull/53165/
3896 [53611]: https://github.com/rust-lang/rust/pull/53611/
3897 [53213]: https://github.com/rust-lang/rust/pull/53213/
3898 [53236]: https://github.com/rust-lang/rust/pull/53236/
3899 [53272]: https://github.com/rust-lang/rust/pull/53272/
3900 [53370]: https://github.com/rust-lang/rust/pull/53370/
3901 [53459]: https://github.com/rust-lang/rust/pull/53459/
3902 [53774]: https://github.com/rust-lang/rust/pull/53774/
3903 [53822]: https://github.com/rust-lang/rust/pull/53822/
3904 [54057]: https://github.com/rust-lang/rust/pull/54057/
3905 [54146]: https://github.com/rust-lang/rust/pull/54146/
3906 [54404]: https://github.com/rust-lang/rust/pull/54404/
3907 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3908 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3909 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3910 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3912 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3913 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3914 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3915 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3916 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3917 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3918 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3919 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3920 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3921 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3924 Version 1.29.2 (2018-10-11)
3925 ===========================
3927 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3928 - The `rls-preview` component on the windows-gnu targets has been restored.
3930 [54639]: https://github.com/rust-lang/rust/pull/54639
3933 Version 1.29.1 (2018-09-25)
3934 ===========================
3939 - The standard library's `str::repeat` function contained an out of bounds write
3940 caused by an integer overflow. This has been fixed by deterministically
3941 panicking when an overflow happens.
3943 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3947 Version 1.29.0 (2018-09-13)
3948 ==========================
3952 - [Bumped minimum LLVM version to 5.0.][51899]
3953 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3954 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3955 - [Upgraded to LLVM 7.][51966]
3959 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3960 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3961 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3962 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3964 - [`Cell<T>` now allows `T` to be unsized.][50494]
3965 - [`SocketAddr` is now stable on Redox.][52656]
3970 - [`Iterator::flatten`]
3975 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3976 `--locked` to disable this behavior.
3977 - [`cargo-install` will now allow you to cross compile an install
3978 using `--target`.][cargo/5614]
3979 - [Added the `cargo-fix` subcommand to automatically move project code from
3980 2015 edition to 2018.][cargo/5723]
3981 - [`cargo doc` can now optionally document private types using the
3982 `--document-private-items` flag.][cargo/5543]
3986 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3987 the specified level to that level.][52354] For example `--cap-lints warn`
3988 will demote `deny` and `forbid` lints to `warn`.
3989 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3990 fails and `101` if there is a panic.][52197]
3991 - [A preview of clippy has been made available through rustup.][51122]
3992 You can install the preview with `rustup component add clippy-preview`.
3996 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3997 Use `str::get_unchecked(begin..end)` instead.
3998 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3999 Consider using the `home_dir` function from
4000 https://crates.io/crates/dirs instead.
4001 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4002 - [`cfg` attributes and `--cfg` command line flags are now more
4003 strictly validated.][53893]
4005 [53893]: https://github.com/rust-lang/rust/pull/53893/
4006 [52861]: https://github.com/rust-lang/rust/pull/52861/
4007 [51966]: https://github.com/rust-lang/rust/pull/51966/
4008 [52656]: https://github.com/rust-lang/rust/pull/52656/
4009 [52239]: https://github.com/rust-lang/rust/pull/52239/
4010 [52330]: https://github.com/rust-lang/rust/pull/52330/
4011 [52354]: https://github.com/rust-lang/rust/pull/52354/
4012 [52402]: https://github.com/rust-lang/rust/pull/52402/
4013 [52103]: https://github.com/rust-lang/rust/pull/52103/
4014 [52197]: https://github.com/rust-lang/rust/pull/52197/
4015 [51807]: https://github.com/rust-lang/rust/pull/51807/
4016 [51899]: https://github.com/rust-lang/rust/pull/51899/
4017 [51912]: https://github.com/rust-lang/rust/pull/51912/
4018 [51511]: https://github.com/rust-lang/rust/pull/51511/
4019 [51619]: https://github.com/rust-lang/rust/pull/51619/
4020 [51656]: https://github.com/rust-lang/rust/pull/51656/
4021 [51178]: https://github.com/rust-lang/rust/pull/51178/
4022 [51122]: https://github.com/rust-lang/rust/pull/51122
4023 [50494]: https://github.com/rust-lang/rust/pull/50494/
4024 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4025 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4026 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4027 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4028 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4029 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4030 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4033 Version 1.28.0 (2018-08-02)
4034 ===========================
4038 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4039 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4040 the inner type across Foreign Function Interface (FFI) boundaries.
4041 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4042 and can now be used as identifiers.][51196]
4043 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4044 stable.][51241] This will allow users to specify a global allocator for
4046 - [Unit test functions marked with the `#[test]` attribute can now return
4047 `Result<(), E: Debug>` in addition to `()`.][51298]
4048 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4049 allows macros to easily target lifetimes.
4053 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4054 prioritise making smaller binary sizes. `z` is the same as `s` with the
4055 exception that it does not vectorise loops, which typically results in an even
4057 - [The short error format is now stable.][49546] Specified with
4058 `--error-format=short` this option will provide a more compressed output of
4059 rust error messages.
4060 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4061 - [Reduced the number of allocations in the macro parser.][50855] This can
4062 improve compile times of macro heavy crates on average by 5%.
4066 - [Implemented `Default` for `&mut str`.][51306]
4067 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4068 - [Implemented `Extend` for `()`.][50234]
4069 - [The `Debug` implementation of `time::Duration` should now be more easily
4070 human readable.][50364] Previously a `Duration` of one second would printed as
4071 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4072 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4073 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4074 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4075 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4076 for `PathBuf`.][50170]
4077 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4078 and `Wrapping<i128>`.][50465]
4079 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4080 possible.][51050] This can provide up to a 40% speed increase.
4081 - [Improved error messages when using `format!`.][50610]
4085 - [`Iterator::step_by`]
4086 - [`Path::ancestors`]
4087 - [`SystemTime::UNIX_EPOCH`]
4088 - [`alloc::GlobalAlloc`]
4090 - [`alloc::LayoutErr`]
4093 - [`alloc::alloc_zeroed`]
4094 - [`alloc::dealloc`]
4095 - [`alloc::realloc`]
4096 - [`alloc::handle_alloc_error`]
4097 - [`btree_map::Entry::or_default`]
4098 - [`fmt::Alignment`]
4099 - [`hash_map::Entry::or_default`]
4100 - [`iter::repeat_with`]
4101 - [`num::NonZeroUsize`]
4102 - [`num::NonZeroU128`]
4103 - [`num::NonZeroU16`]
4104 - [`num::NonZeroU32`]
4105 - [`num::NonZeroU64`]
4106 - [`num::NonZeroU8`]
4107 - [`ops::RangeBounds`]
4108 - [`slice::SliceIndex`]
4109 - [`slice::from_mut`]
4110 - [`slice::from_ref`]
4111 - [`{Any + Send + Sync}::downcast_mut`]
4112 - [`{Any + Send + Sync}::downcast_ref`]
4113 - [`{Any + Send + Sync}::is`]
4117 - [Cargo will now no longer allow you to publish crates with build scripts that
4118 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4119 considered to be immutable.
4123 - [The `suggestion_applicability` field in `rustc`'s json output is now
4124 stable.][50486] This will allow dev tools to check whether a code suggestion
4125 would apply to them.
4129 - [Rust will consider trait objects with duplicated constraints to be the same
4130 type as without the duplicated constraint.][51276] For example the below code will
4131 now fail to compile.
4136 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4139 impl Trait + Send + Send {
4140 fn test(&self) { println!("two"); }
4144 [49546]: https://github.com/rust-lang/rust/pull/49546/
4145 [50143]: https://github.com/rust-lang/rust/pull/50143/
4146 [50170]: https://github.com/rust-lang/rust/pull/50170/
4147 [50234]: https://github.com/rust-lang/rust/pull/50234/
4148 [50265]: https://github.com/rust-lang/rust/pull/50265/
4149 [50364]: https://github.com/rust-lang/rust/pull/50364/
4150 [50385]: https://github.com/rust-lang/rust/pull/50385/
4151 [50465]: https://github.com/rust-lang/rust/pull/50465/
4152 [50486]: https://github.com/rust-lang/rust/pull/50486/
4153 [50554]: https://github.com/rust-lang/rust/pull/50554/
4154 [50610]: https://github.com/rust-lang/rust/pull/50610/
4155 [50855]: https://github.com/rust-lang/rust/pull/50855/
4156 [51050]: https://github.com/rust-lang/rust/pull/51050/
4157 [51196]: https://github.com/rust-lang/rust/pull/51196/
4158 [51200]: https://github.com/rust-lang/rust/pull/51200/
4159 [51241]: https://github.com/rust-lang/rust/pull/51241/
4160 [51276]: https://github.com/rust-lang/rust/pull/51276/
4161 [51298]: https://github.com/rust-lang/rust/pull/51298/
4162 [51306]: https://github.com/rust-lang/rust/pull/51306/
4163 [51562]: https://github.com/rust-lang/rust/pull/51562/
4164 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4165 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4166 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4167 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4168 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4169 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4170 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4171 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4172 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4173 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4174 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4175 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4176 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4177 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4178 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4179 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4180 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4181 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4182 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4183 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4184 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4185 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4186 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4187 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4188 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4189 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4190 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4191 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4192 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4193 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4195 Version 1.27.2 (2018-07-20)
4196 ===========================
4201 - The borrow checker was fixed to avoid potential unsoundness when using
4202 match ergonomics: [#52213][52213].
4204 [52213]: https://github.com/rust-lang/rust/issues/52213
4206 Version 1.27.1 (2018-07-10)
4207 ===========================
4212 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4213 when running, which enabled executing code as some other user on a
4214 given machine. This release fixes that vulnerability; you can read
4215 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4217 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4222 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4223 match ergonomics: [#51415][51415], [#49534][49534].
4225 [51415]: https://github.com/rust-lang/rust/issues/51415
4226 [49534]: https://github.com/rust-lang/rust/issues/49534
4227 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4228 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4230 Version 1.27.0 (2018-06-21)
4231 ==========================
4235 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4236 be used as an identifier.
4237 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4238 bare `Trait` syntax, and should make it clearer when being used in tandem with
4239 `impl Trait` because it is equivalent to the following syntax:
4240 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4241 `Box<Trait> == Box<dyn Trait>`.
4242 - [Attributes on generic parameters such as types and lifetimes are
4243 now stable.][48851] e.g.
4244 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4245 - [The `#[must_use]` attribute can now also be used on functions as well as
4246 types.][48925] It provides a lint that by default warns users when the
4247 value returned by a function has not been used.
4251 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4255 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4256 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4257 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4258 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4259 the `cfg` attribute.
4260 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4261 std are now available in core.][49896]
4262 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4264 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4265 that the operation isn't done in place.
4266 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4267 the `#[must_use]` attribute][49533] to warn about unused potentially
4268 expensive allocations.
4272 - [`DoubleEndedIterator::rfind`]
4273 - [`DoubleEndedIterator::rfold`]
4274 - [`DoubleEndedIterator::try_rfold`]
4275 - [`Duration::from_micros`]
4276 - [`Duration::from_nanos`]
4277 - [`Duration::subsec_micros`]
4278 - [`Duration::subsec_millis`]
4279 - [`HashMap::remove_entry`]
4280 - [`Iterator::try_fold`]
4281 - [`Iterator::try_for_each`]
4283 - [`Option::filter`]
4284 - [`String::replace_range`]
4285 - [`Take::set_limit`]
4286 - [`hint::unreachable_unchecked`]
4287 - [`os::unix::process::parent_id`]
4288 - [`ptr::swap_nonoverlapping`]
4289 - [`slice::rsplit_mut`]
4291 - [`slice::swap_with_slice`]
4295 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4296 `readme`, and `repository` fields.][cargo/5386]
4297 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4298 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4299 a different directory than `target` for placing compilation artifacts.
4300 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4301 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4302 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4303 where cargo would infer a binary, Cargo will produce a warning. You can
4304 disable this feature ahead of time by setting any of the following to false:
4305 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4306 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4307 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4311 - [Added “The Rustc book” into the official documentation.][49707]
4312 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4313 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4317 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4318 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4319 compile, `"".is_empty()` will still compile.
4320 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4321 will only print the inner type.][48553] E.g.
4322 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4323 not `AtomicBool(true)`.
4324 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4325 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4326 alignment should cover all use cases.
4327 - The `.description()` method on the `std::error::Error` trait
4328 [has been soft-deprecated][50163]. It is no longer required to implement it.
4330 [48553]: https://github.com/rust-lang/rust/pull/48553/
4331 [48851]: https://github.com/rust-lang/rust/pull/48851/
4332 [48925]: https://github.com/rust-lang/rust/pull/48925/
4333 [49533]: https://github.com/rust-lang/rust/pull/49533/
4334 [49623]: https://github.com/rust-lang/rust/pull/49623/
4335 [49630]: https://github.com/rust-lang/rust/pull/49630/
4336 [49664]: https://github.com/rust-lang/rust/pull/49664/
4337 [49699]: https://github.com/rust-lang/rust/pull/49699/
4338 [49707]: https://github.com/rust-lang/rust/pull/49707/
4339 [49719]: https://github.com/rust-lang/rust/pull/49719/
4340 [49896]: https://github.com/rust-lang/rust/pull/49896/
4341 [49968]: https://github.com/rust-lang/rust/pull/49968/
4342 [50163]: https://github.com/rust-lang/rust/pull/50163
4343 [50177]: https://github.com/rust-lang/rust/pull/50177/
4344 [50378]: https://github.com/rust-lang/rust/pull/50378/
4345 [50398]: https://github.com/rust-lang/rust/pull/50398/
4346 [50423]: https://github.com/rust-lang/rust/pull/50423/
4347 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4348 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4349 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4350 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4351 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4352 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4353 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4354 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4355 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4356 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4357 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4358 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4359 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4360 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4361 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4362 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4363 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4364 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4365 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4366 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4367 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4368 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4369 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4370 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4371 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4372 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4373 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4374 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4375 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4376 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4379 Version 1.26.2 (2018-06-05)
4380 ==========================
4385 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4387 [51117]: https://github.com/rust-lang/rust/issues/51117
4390 Version 1.26.1 (2018-05-29)
4391 ==========================
4396 - [RLS now works on Windows.][50646]
4397 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4403 - [`fn main() -> impl Trait` no longer works for non-Termination
4405 This reverts an accidental stabilization.
4406 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4407 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4409 [50646]: https://github.com/rust-lang/rust/issues/50646
4410 [50656]: https://github.com/rust-lang/rust/pull/50656
4411 [50812]: https://github.com/rust-lang/rust/pull/50812
4412 [50950]: https://github.com/rust-lang/rust/issues/50950
4413 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4415 Version 1.26.0 (2018-05-10)
4416 ==========================
4420 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4421 implement either or both traits.][49299]
4422 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4423 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4424 lifetime can be elided.][49458]
4425 - [`impl Trait` is now stable allowing you to have abstract types in returns
4426 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4427 `fn open(path: impl AsRef<Path>)`.
4428 - [Pattern matching will now automatically apply dereferences.][49394]
4429 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4430 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4431 - [A lot of operations are now available in a const context.][46882] E.g. You
4432 can now index into constant arrays, reference and dereference into constants,
4433 and use tuple struct constructors.
4434 - [Fixed entry slice patterns are now stable.][48516] E.g.
4436 let points = [1, 2, 3, 4];
4438 [1, 2, 3, 4] => println!("All points were sequential."),
4439 _ => println!("Not all points were sequential."),
4446 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4447 - [Fixed exponential projection complexity on nested types.][48296]
4448 This can provide up to a ~12% reduction in compile times for certain crates.
4449 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4450 to remap path prefixes outputted by the compiler.
4451 - [Added `powerpc-unknown-netbsd` target.][48281]
4455 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4456 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4457 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4458 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4459 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4460 - [`ascii::escape_default` is now available in libcore.][48735]
4461 - [Trailing commas are now supported in std and core macros.][48056]
4462 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4463 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4468 - [`*const T::copy_to_nonoverlapping`]
4469 - [`*const T::copy_to`]
4470 - [`*const T::read_unaligned`]
4471 - [`*const T::read_volatile`]
4472 - [`*const T::read`]
4474 - [`*const T::wrapping_add`]
4475 - [`*const T::wrapping_sub`]
4477 - [`*mut T::copy_to_nonoverlapping`]
4478 - [`*mut T::copy_to`]
4479 - [`*mut T::read_unaligned`]
4480 - [`*mut T::read_volatile`]
4482 - [`*mut T::replace`]
4485 - [`*mut T::wrapping_add`]
4486 - [`*mut T::wrapping_sub`]
4487 - [`*mut T::write_bytes`]
4488 - [`*mut T::write_unaligned`]
4489 - [`*mut T::write_volatile`]
4492 - [`FromUtf8Error::as_bytes`]
4493 - [`LocalKey::try_with`]
4494 - [`Option::cloned`]
4495 - [`btree_map::Entry::and_modify`]
4496 - [`fs::read_to_string`]
4499 - [`hash_map::Entry::and_modify`]
4500 - [`iter::FusedIterator`]
4501 - [`ops::RangeInclusive`]
4502 - [`ops::RangeToInclusive`]
4504 - [`slice::rotate_left`]
4505 - [`slice::rotate_right`]
4506 - [`String::retain`]
4511 - [Cargo will now output path to custom commands when `-v` is
4512 passed with `--list`][cargo/5041]
4513 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4517 - [The second edition of "The Rust Programming Language" book is now recommended
4518 over the first.][48404]
4523 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4524 syntax is now invalid.
4526 use std::ops::Fn as dyn;
4527 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4529 - [The result of dereferences are no longer promoted to `'static`.][47408]
4533 const PAIR: &(i32, i32) = &(0, 1);
4534 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4537 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4538 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4540 - [Removed hoedown from rustdoc.][48274]
4541 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4543 [46882]: https://github.com/rust-lang/rust/pull/46882
4544 [47379]: https://github.com/rust-lang/rust/pull/47379
4545 [47408]: https://github.com/rust-lang/rust/pull/47408
4546 [47813]: https://github.com/rust-lang/rust/pull/47813
4547 [48056]: https://github.com/rust-lang/rust/pull/48056
4548 [48125]: https://github.com/rust-lang/rust/pull/48125
4549 [48166]: https://github.com/rust-lang/rust/pull/48166
4550 [48235]: https://github.com/rust-lang/rust/pull/48235
4551 [48274]: https://github.com/rust-lang/rust/pull/48274
4552 [48281]: https://github.com/rust-lang/rust/pull/48281
4553 [48296]: https://github.com/rust-lang/rust/pull/48296
4554 [48326]: https://github.com/rust-lang/rust/pull/48326
4555 [48359]: https://github.com/rust-lang/rust/pull/48359
4556 [48404]: https://github.com/rust-lang/rust/pull/48404
4557 [48481]: https://github.com/rust-lang/rust/pull/48481
4558 [48516]: https://github.com/rust-lang/rust/pull/48516
4559 [48628]: https://github.com/rust-lang/rust/pull/48628
4560 [48629]: https://github.com/rust-lang/rust/pull/48629
4561 [48657]: https://github.com/rust-lang/rust/pull/48657
4562 [48735]: https://github.com/rust-lang/rust/pull/48735
4563 [48978]: https://github.com/rust-lang/rust/pull/48978
4564 [49101]: https://github.com/rust-lang/rust/pull/49101
4565 [49109]: https://github.com/rust-lang/rust/pull/49109
4566 [49121]: https://github.com/rust-lang/rust/pull/49121
4567 [49162]: https://github.com/rust-lang/rust/pull/49162
4568 [49184]: https://github.com/rust-lang/rust/pull/49184
4569 [49234]: https://github.com/rust-lang/rust/pull/49234
4570 [49255]: https://github.com/rust-lang/rust/pull/49255
4571 [49299]: https://github.com/rust-lang/rust/pull/49299
4572 [49305]: https://github.com/rust-lang/rust/pull/49305
4573 [49394]: https://github.com/rust-lang/rust/pull/49394
4574 [49458]: https://github.com/rust-lang/rust/pull/49458
4575 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4576 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4577 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4578 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4579 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4580 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4581 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4582 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4583 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4584 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4585 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4586 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4587 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4588 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4589 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4590 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4591 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4592 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4593 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4594 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4595 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4596 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4597 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4598 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4599 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4600 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4601 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4602 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4603 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4604 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4605 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4606 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4607 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4608 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4609 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4610 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4611 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4612 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4613 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4614 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4615 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4616 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4619 Version 1.25.0 (2018-03-29)
4620 ==========================
4624 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4625 - [You can now use nested groups of imports.][47948]
4626 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4627 - [You can now have `|` at the start of a match arm.][47947] e.g.
4629 enum Foo { A, B, C }
4635 | Foo::B => println!("AB"),
4636 | Foo::C => println!("C"),
4643 - [Upgraded to LLVM 6.][47828]
4644 - [Added `-C lto=val` option.][47521]
4645 - [Added `i586-unknown-linux-musl` target][47282]
4649 - [Impl Send for `process::Command` on Unix.][47760]
4650 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4651 - [`UnsafeCell::into_inner` is now safe.][47204]
4652 - [Implement libstd for CloudABI.][47268]
4653 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4654 - [Implement `AsRef<Path>` for Component][46985]
4655 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4656 - [Moved `Duration` to libcore.][46666]
4660 - [`Location::column`]
4663 The following functions can now be used in a constant expression.
4664 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4665 - [`Duration::new`][47300]
4666 - [`Duration::from_secs`][47300]
4667 - [`Duration::from_millis`][47300]
4671 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4672 - [`cargo new` now defaults to creating a binary crate, instead of a
4673 library crate.][cargo/5029]
4677 - [Rust by example is now shipped with new releases][46196]
4681 - [Deprecated `net::lookup_host`.][47510]
4682 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4683 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4684 around indexing operations (see [#47349][47349]). This has been fixed (which also
4685 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4686 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4688 [33903]: https://github.com/rust-lang/rust/pull/33903
4689 [47947]: https://github.com/rust-lang/rust/pull/47947
4690 [47948]: https://github.com/rust-lang/rust/pull/47948
4691 [47760]: https://github.com/rust-lang/rust/pull/47760
4692 [47790]: https://github.com/rust-lang/rust/pull/47790
4693 [47828]: https://github.com/rust-lang/rust/pull/47828
4694 [47398]: https://github.com/rust-lang/rust/pull/47398
4695 [47510]: https://github.com/rust-lang/rust/pull/47510
4696 [47521]: https://github.com/rust-lang/rust/pull/47521
4697 [47204]: https://github.com/rust-lang/rust/pull/47204
4698 [47251]: https://github.com/rust-lang/rust/pull/47251
4699 [47268]: https://github.com/rust-lang/rust/pull/47268
4700 [47282]: https://github.com/rust-lang/rust/pull/47282
4701 [47300]: https://github.com/rust-lang/rust/pull/47300
4702 [47349]: https://github.com/rust-lang/rust/pull/47349
4703 [46931]: https://github.com/rust-lang/rust/pull/46931
4704 [46985]: https://github.com/rust-lang/rust/pull/46985
4705 [47006]: https://github.com/rust-lang/rust/pull/47006
4706 [46830]: https://github.com/rust-lang/rust/pull/46830
4707 [46095]: https://github.com/rust-lang/rust/pull/46095
4708 [46666]: https://github.com/rust-lang/rust/pull/46666
4709 [46196]: https://github.com/rust-lang/rust/pull/46196
4710 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4711 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4712 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4713 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4714 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4717 Version 1.24.1 (2018-03-01)
4718 ==========================
4720 - [Do not abort when unwinding through FFI][48251]
4721 - [Emit UTF-16 files for linker arguments on Windows][48318]
4722 - [Make the error index generator work again][48308]
4723 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4725 [48251]: https://github.com/rust-lang/rust/issues/48251
4726 [48308]: https://github.com/rust-lang/rust/issues/48308
4727 [48318]: https://github.com/rust-lang/rust/issues/48318
4728 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4731 Version 1.24.0 (2018-02-15)
4732 ==========================
4736 - [External `sysv64` ffi is now available.][46528]
4737 eg. `extern "sysv64" fn foo () {}`
4741 - [rustc now uses 16 codegen units by default for release builds.][46910]
4742 For the fastest builds, utilize `codegen-units=1`.
4743 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4744 - [Add `aarch64-unknown-openbsd` support][46760]
4748 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4749 improvement in performance in the majority of cases.
4750 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4751 with Windows.][46798]
4752 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4753 - [impl `From<bool>` for `AtomicBool`][46293]
4754 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4755 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4756 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4757 - [float::from_bits now just uses transmute.][46012] This provides
4758 some optimisations from LLVM.
4759 - [Copied `AsciiExt` methods onto `char`][46077]
4760 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4761 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4762 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4763 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4767 - [`RefCell::replace`]
4769 - [`atomic::spin_loop_hint`]
4771 The following functions can now be used in a constant expression.
4772 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4774 - [`AtomicBool::new`][46287]
4775 - [`AtomicUsize::new`][46287]
4776 - [`AtomicIsize::new`][46287]
4777 - [`AtomicPtr::new`][46287]
4778 - [`Cell::new`][46287]
4779 - [`{integer}::min_value`][46287]
4780 - [`{integer}::max_value`][46287]
4781 - [`mem::size_of`][46287]
4782 - [`mem::align_of`][46287]
4783 - [`ptr::null`][46287]
4784 - [`ptr::null_mut`][46287]
4785 - [`RefCell::new`][46287]
4786 - [`UnsafeCell::new`][46287]
4790 - [Added a `workspace.default-members` config that
4791 overrides implied `--all` in virtual workspaces.][cargo/4743]
4792 - [Enable incremental by default on development builds.][cargo/4817] Also added
4793 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4794 per-project or global basis respectively.
4801 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4802 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4803 in accordance with IETF RFC 4291 §2.2.
4804 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4805 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4806 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4807 - [Leading zeros in tuple struct members is now an error][47084]
4808 - [`column!()` macro is one-based instead of zero-based][46977]
4809 - [`fmt::Arguments` can no longer be shared across threads][45198]
4810 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4811 - [Cargo sets a different working directory for the compiler][cargo/4788]
4813 [44884]: https://github.com/rust-lang/rust/pull/44884
4814 [45198]: https://github.com/rust-lang/rust/pull/45198
4815 [45506]: https://github.com/rust-lang/rust/pull/45506
4816 [45904]: https://github.com/rust-lang/rust/pull/45904
4817 [45990]: https://github.com/rust-lang/rust/pull/45990
4818 [46012]: https://github.com/rust-lang/rust/pull/46012
4819 [46077]: https://github.com/rust-lang/rust/pull/46077
4820 [46094]: https://github.com/rust-lang/rust/pull/46094
4821 [46284]: https://github.com/rust-lang/rust/pull/46284
4822 [46287]: https://github.com/rust-lang/rust/pull/46287
4823 [46293]: https://github.com/rust-lang/rust/pull/46293
4824 [46528]: https://github.com/rust-lang/rust/pull/46528
4825 [46671]: https://github.com/rust-lang/rust/pull/46671
4826 [46713]: https://github.com/rust-lang/rust/pull/46713
4827 [46735]: https://github.com/rust-lang/rust/pull/46735
4828 [46749]: https://github.com/rust-lang/rust/pull/46749
4829 [46760]: https://github.com/rust-lang/rust/pull/46760
4830 [46798]: https://github.com/rust-lang/rust/pull/46798
4831 [46828]: https://github.com/rust-lang/rust/pull/46828
4832 [46831]: https://github.com/rust-lang/rust/pull/46831
4833 [46833]: https://github.com/rust-lang/rust/pull/46833
4834 [46910]: https://github.com/rust-lang/rust/pull/46910
4835 [46977]: https://github.com/rust-lang/rust/pull/46977
4836 [47018]: https://github.com/rust-lang/rust/pull/47018
4837 [47080]: https://github.com/rust-lang/rust/pull/47080
4838 [47084]: https://github.com/rust-lang/rust/pull/47084
4839 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4840 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4841 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4842 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4843 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4844 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4847 Version 1.23.0 (2018-01-04)
4848 ==========================
4852 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4853 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4854 Which should fix some confusing errors in some operations.
4858 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4859 undefined behavior.][45920]
4860 - [rustc now suggests renaming import if names clash.][45660]
4861 - [Display errors/warnings correctly when there are zero-width or
4862 wide characters.][45711]
4863 - [rustc now avoids unnecessary copies of arguments that are
4864 simple bindings][45380] This should improve memory usage on average by 5-10%.
4865 - [Updated musl used to build musl rustc to 1.1.17][45393]
4869 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4870 - [Implement Hash for raw pointers to unsized types][45483]
4871 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4872 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4873 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4874 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4875 and `<*mut T>::as_mut`][44932]
4876 - [Optimized `Thread::{park, unpark}` implementation][45524]
4877 - [Improved `SliceExt::binary_search` performance.][45333]
4878 - [impl `FromIterator<()>` for `()`][45379]
4879 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4887 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4888 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4889 - [Added unit test checking to `cargo check`][cargo/4592]
4890 - [Cargo now lets you install a specific version
4891 using `cargo install --version`][cargo/4637]
4895 - [Releases now ship with the Cargo book documentation.][45692]
4896 - [rustdoc now prints rendering warnings on every run.][45324]
4900 - [Changes have been made to type equality to make it more correct,
4901 in rare cases this could break some code.][45853] [Tracking issue for
4902 further information][45852]
4903 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4904 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4905 Android 9, the minimum supported version is Android 14.
4906 - [Bumped the minimum LLVM to 3.9][45326]
4908 [44042]: https://github.com/rust-lang/rust/pull/44042
4909 [44932]: https://github.com/rust-lang/rust/pull/44932
4910 [45267]: https://github.com/rust-lang/rust/pull/45267
4911 [45324]: https://github.com/rust-lang/rust/pull/45324
4912 [45326]: https://github.com/rust-lang/rust/pull/45326
4913 [45333]: https://github.com/rust-lang/rust/pull/45333
4914 [45379]: https://github.com/rust-lang/rust/pull/45379
4915 [45380]: https://github.com/rust-lang/rust/pull/45380
4916 [45393]: https://github.com/rust-lang/rust/pull/45393
4917 [45435]: https://github.com/rust-lang/rust/pull/45435
4918 [45483]: https://github.com/rust-lang/rust/pull/45483
4919 [45524]: https://github.com/rust-lang/rust/pull/45524
4920 [45571]: https://github.com/rust-lang/rust/pull/45571
4921 [45580]: https://github.com/rust-lang/rust/pull/45580
4922 [45610]: https://github.com/rust-lang/rust/pull/45610
4923 [45660]: https://github.com/rust-lang/rust/pull/45660
4924 [45692]: https://github.com/rust-lang/rust/pull/45692
4925 [45711]: https://github.com/rust-lang/rust/pull/45711
4926 [45772]: https://github.com/rust-lang/rust/pull/45772
4927 [45852]: https://github.com/rust-lang/rust/issues/45852
4928 [45853]: https://github.com/rust-lang/rust/pull/45853
4929 [45887]: https://github.com/rust-lang/rust/pull/45887
4930 [45920]: https://github.com/rust-lang/rust/pull/45920
4931 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4932 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4933 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4936 Version 1.22.1 (2017-11-22)
4937 ==========================
4939 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4941 [46183]: https://github.com/rust-lang/rust/pull/46183
4943 Version 1.22.0 (2017-11-22)
4944 ==========================
4948 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4949 - [Now accepts underscores in unicode escapes][43716]
4950 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4951 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4955 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4956 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4957 This should decrease compile times for debug builds.
4958 - [strict memory alignment now enabled on ARMv6][45094]
4959 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4963 - [Allow atomic operations up to 32 bits
4964 on `armv5te_unknown_linux_gnueabi`][44978]
4965 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4966 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4967 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4968 - [Properly detect overflow in `Instant += Duration`.][44220]
4969 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4970 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4971 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4978 - [Cargo will now build multi file examples in subdirectories of the `examples`
4979 folder that have a `main.rs` file.][cargo/4496]
4980 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4981 the old format will continue to work and can be updated with `cargo update`.
4982 - [Now supports vendoring git repositories][cargo/3992]
4986 - [`libbacktrace` is now available on Apple platforms.][44251]
4987 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4988 This now lets you specify that a given code example will fail to compile.
4992 - [The minimum Android version that rustc can build for has been bumped
4993 to `4.0` from `2.3`][45656]
4994 - [Allowing `T op= &T` for numeric types has broken some type
4995 inference cases][45480]
4998 [42526]: https://github.com/rust-lang/rust/pull/42526
4999 [43017]: https://github.com/rust-lang/rust/pull/43017
5000 [43716]: https://github.com/rust-lang/rust/pull/43716
5001 [43949]: https://github.com/rust-lang/rust/pull/43949
5002 [44015]: https://github.com/rust-lang/rust/pull/44015
5003 [44220]: https://github.com/rust-lang/rust/pull/44220
5004 [44251]: https://github.com/rust-lang/rust/pull/44251
5005 [44287]: https://github.com/rust-lang/rust/pull/44287
5006 [44303]: https://github.com/rust-lang/rust/pull/44303
5007 [44456]: https://github.com/rust-lang/rust/pull/44456
5008 [44466]: https://github.com/rust-lang/rust/pull/44466
5009 [44895]: https://github.com/rust-lang/rust/pull/44895
5010 [44966]: https://github.com/rust-lang/rust/pull/44966
5011 [44978]: https://github.com/rust-lang/rust/pull/44978
5012 [45041]: https://github.com/rust-lang/rust/pull/45041
5013 [45064]: https://github.com/rust-lang/rust/pull/45064
5014 [45075]: https://github.com/rust-lang/rust/pull/45075
5015 [45094]: https://github.com/rust-lang/rust/pull/45094
5016 [45095]: https://github.com/rust-lang/rust/pull/45095
5017 [45480]: https://github.com/rust-lang/rust/issues/45480
5018 [45656]: https://github.com/rust-lang/rust/pull/45656
5019 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5020 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5021 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5028 Version 1.21.0 (2017-10-12)
5029 ==========================
5033 - [You can now use static references for literals.][43838]
5037 let x: &'static u32 = &0;
5040 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5043 my_macro!(Vec<i32>::new); // Always worked
5044 my_macro!(Vec::<i32>::new); // Now works
5049 - [Upgraded jemalloc to 4.5.0][43911]
5050 - [Enabled unwinding panics on Redox][43917]
5051 - [Now runs LLVM in parallel during translation phase.][43506]
5052 This should reduce peak memory usage.
5056 - [Generate builtin impls for `Clone` for all arrays and tuples that
5057 are `T: Clone`][43690]
5058 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5059 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5060 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5065 [`std::mem::discriminant`]
5069 - [You can now call `cargo install` with multiple package names][cargo/4216]
5070 - [Cargo commands inside a virtual workspace will now implicitly
5071 pass `--all`][cargo/4335]
5072 - [Added a `[patch]` section to `Cargo.toml` to handle
5073 prepublication dependencies][cargo/4123] [RFC 1969]
5074 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5075 like patterns][cargo/4270]
5076 - [Added the `--all-targets` option][cargo/4400]
5077 - [Using required dependencies as a feature is now deprecated and emits
5078 a warning][cargo/4364]
5083 - [Cargo docs are moving][43916]
5084 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5085 - [The rustdoc book is now available][43863]
5086 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5087 - [Added a preview of RLS has been made available through rustup][44204]
5088 Install with `rustup component add rls-preview`
5089 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5090 Previously only showed `std::os::unix`.
5094 - [Changes in method matching against higher-ranked types][43880] This may cause
5095 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5096 - [rustc's JSON error output's byte position start at top of file.][42973]
5097 Was previously relative to the rustc's internal `CodeMap` struct which
5098 required the unstable library `libsyntax` to correctly use.
5099 - [`unused_results` lint no longer ignores booleans][43728]
5101 [42565]: https://github.com/rust-lang/rust/pull/42565
5102 [42973]: https://github.com/rust-lang/rust/pull/42973
5103 [43348]: https://github.com/rust-lang/rust/pull/43348
5104 [43459]: https://github.com/rust-lang/rust/pull/43459
5105 [43506]: https://github.com/rust-lang/rust/pull/43506
5106 [43540]: https://github.com/rust-lang/rust/pull/43540
5107 [43690]: https://github.com/rust-lang/rust/pull/43690
5108 [43728]: https://github.com/rust-lang/rust/pull/43728
5109 [43838]: https://github.com/rust-lang/rust/pull/43838
5110 [43863]: https://github.com/rust-lang/rust/pull/43863
5111 [43880]: https://github.com/rust-lang/rust/pull/43880
5112 [43911]: https://github.com/rust-lang/rust/pull/43911
5113 [43916]: https://github.com/rust-lang/rust/pull/43916
5114 [43917]: https://github.com/rust-lang/rust/pull/43917
5115 [44204]: https://github.com/rust-lang/rust/pull/44204
5116 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5117 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5118 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5119 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5120 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5121 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5122 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5123 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5124 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5126 Version 1.20.0 (2017-08-31)
5127 ===========================
5131 - [Associated constants are now stabilised.][42809]
5132 - [A lot of macro bugs are now fixed.][42913]
5137 - [Struct fields are now properly coerced to the expected field type.][42807]
5138 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5139 `wasm32-experimental-emscripten` target.
5140 - [Changed some of the error messages to be more helpful.][42033]
5141 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5143 - [rustc now reports the total number of errors on compilation failure][43015]
5144 previously this was only the number of errors in the pass that failed.
5145 - [Expansion in rustc has been sped up 29x.][42533]
5146 - [added `msp430-none-elf` target.][43099]
5147 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5149 - [Fixes backtraces on Redox][43228]
5150 - [rustc now identifies different versions of same crate when absolute paths of
5151 different types match in an error message.][42826]
5157 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5158 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5160 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5161 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5162 - [Impl `Clone` for `DefaultHasher`.][42799]
5163 - [Impl `Sync` for `SyncSender`.][42397]
5164 - [Impl `FromStr` for `char`][42271]
5165 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5167 - [allow messages in the `unimplemented!()` macro.][42155]
5168 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5169 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5170 - [Upgrade to Unicode 10.0.0][42999]
5171 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5172 - [Skip the main thread's manual stack guard on Linux][43072]
5173 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5174 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5176 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5181 - [`CStr::into_c_string`]
5182 - [`CString::as_c_str`]
5183 - [`CString::into_boxed_c_str`]
5184 - [`Chain::get_mut`]
5185 - [`Chain::get_ref`]
5186 - [`Chain::into_inner`]
5187 - [`Option::get_or_insert_with`]
5188 - [`Option::get_or_insert`]
5189 - [`OsStr::into_os_string`]
5190 - [`OsString::into_boxed_os_str`]
5193 - [`Utf8Error::error_len`]
5194 - [`char::EscapeDebug`]
5195 - [`char::escape_debug`]
5196 - [`compile_error!`]
5197 - [`f32::from_bits`]
5199 - [`f64::from_bits`]
5201 - [`mem::ManuallyDrop`]
5202 - [`slice::sort_unstable_by_key`]
5203 - [`slice::sort_unstable_by`]
5204 - [`slice::sort_unstable`]
5205 - [`str::from_boxed_utf8_unchecked`]
5206 - [`str::as_bytes_mut`]
5207 - [`str::as_bytes_mut`]
5208 - [`str::from_utf8_mut`]
5209 - [`str::from_utf8_unchecked_mut`]
5211 - [`str::get_unchecked_mut`]
5212 - [`str::get_unchecked`]
5214 - [`str::into_boxed_bytes`]
5219 - [Cargo API token location moved from `~/.cargo/config` to
5220 `~/.cargo/credentials`.][cargo/3978]
5221 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5222 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5223 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5224 - [You can now specify version of a binary when installed through
5225 `cargo install` using `--vers`.][cargo/4229]
5226 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5227 failure.][cargo/4248]
5228 - [Changed the convention around which file is the crate root.][cargo/4259]
5229 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5230 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5235 - [Functions with `'static` in their return types will now not be as usable as
5236 if they were using lifetime parameters instead.][42417]
5237 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5238 takes the sign of NaN into account where previously didn't.][42430]
5240 [42033]: https://github.com/rust-lang/rust/pull/42033
5241 [42155]: https://github.com/rust-lang/rust/pull/42155
5242 [42271]: https://github.com/rust-lang/rust/pull/42271
5243 [42397]: https://github.com/rust-lang/rust/pull/42397
5244 [42417]: https://github.com/rust-lang/rust/pull/42417
5245 [42430]: https://github.com/rust-lang/rust/pull/42430
5246 [42431]: https://github.com/rust-lang/rust/pull/42431
5247 [42533]: https://github.com/rust-lang/rust/pull/42533
5248 [42571]: https://github.com/rust-lang/rust/pull/42571
5249 [42613]: https://github.com/rust-lang/rust/pull/42613
5250 [42799]: https://github.com/rust-lang/rust/pull/42799
5251 [42807]: https://github.com/rust-lang/rust/pull/42807
5252 [42809]: https://github.com/rust-lang/rust/pull/42809
5253 [42822]: https://github.com/rust-lang/rust/pull/42822
5254 [42826]: https://github.com/rust-lang/rust/pull/42826
5255 [42854]: https://github.com/rust-lang/rust/pull/42854
5256 [42913]: https://github.com/rust-lang/rust/pull/42913
5257 [42999]: https://github.com/rust-lang/rust/pull/42999
5258 [43011]: https://github.com/rust-lang/rust/pull/43011
5259 [43015]: https://github.com/rust-lang/rust/pull/43015
5260 [43072]: https://github.com/rust-lang/rust/pull/43072
5261 [43077]: https://github.com/rust-lang/rust/pull/43077
5262 [43097]: https://github.com/rust-lang/rust/pull/43097
5263 [43099]: https://github.com/rust-lang/rust/pull/43099
5264 [43170]: https://github.com/rust-lang/rust/pull/43170
5265 [43178]: https://github.com/rust-lang/rust/pull/43178
5266 [43185]: https://github.com/rust-lang/rust/pull/43185
5267 [43228]: https://github.com/rust-lang/rust/pull/43228
5268 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5269 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5270 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5271 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5272 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5273 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5274 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5275 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5276 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5277 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5278 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5279 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5280 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5281 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5282 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5283 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5284 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5285 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5286 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5287 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5288 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5289 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5290 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5291 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5292 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5293 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5294 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5295 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5296 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5297 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5298 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5299 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5300 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5301 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5302 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5303 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5304 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5305 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5306 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5309 Version 1.19.0 (2017-07-20)
5310 ===========================
5315 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5316 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5317 - [Macro recursion limit increased to 1024 from 64.][41676]
5318 - [Added lint for detecting unused macros.][41907]
5319 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5320 For example: `let x = loop { break 7; };`
5321 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5322 contain `Copy` types and cannot have a `Drop` implementation.
5323 Example: `union Foo { bar: u8, baz: usize }`
5324 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5325 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5330 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5331 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5332 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5333 you should use `--target armv7-linux-androideabi`.
5334 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5335 - [Minor optimisation of string operations.][42037]
5336 - [Compiler error message is now `aborting due to previous error(s)` instead of
5337 `aborting due to N previous errors`][42150] This was previously inaccurate and
5338 would only count certain kinds of errors.
5339 - [The compiler now supports Visual Studio 2017][42225]
5340 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5341 - [Added a lot][42264] of [new error codes][42302]
5342 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5343 libraries with C Run-time Libraries(CRT) to be statically linked.
5344 - [Fixed various ARM codegen bugs][42740]
5349 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5350 `Extend<Cow<'a, str>>`][41449]
5351 - [`Vec` now implements `From<&mut [T]>`][41530]
5352 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5353 - [`SplitWhitespace` now implements `Clone`][41659]
5354 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5356 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5357 macros, but for printing to stderr.
5362 - [`OsString::shrink_to_fit`]
5365 - [`thread::ThreadId`]
5370 - [Build scripts can now add environment variables to the environment
5371 the crate is being compiled in.
5372 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5373 - [Subcommands now replace the current process rather than spawning a new
5374 child process][cargo/3970]
5375 - [Workspace members can now accept glob file patterns][cargo/3979]
5376 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5377 the members in a given workspace.][cargo/3988]
5378 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5379 - [Target directory path is now in the cargo metadata][cargo/4022]
5380 - [Cargo no longer checks out a local working directory for the
5381 crates.io index][cargo/4026] This should provide smaller file size for the
5382 registry, and improve cloning times, especially on Windows machines.
5383 - [Added an `--exclude` option for excluding certain packages when using the
5384 `--all` option][cargo/4031]
5385 - [Cargo will now automatically retry when receiving a 5xx error
5386 from crates.io][cargo/4032]
5387 - [The `--features` option now accepts multiple comma or space
5388 delimited values.][cargo/4084]
5389 - [Added support for custom target specific runners][cargo/3954]
5394 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5396 - [Rust will now release XZ compressed packages][rust-installer/57]
5397 - [rustup will now prefer to download rust packages with
5398 XZ compression][rustup/1100] over GZip packages.
5399 - [Added the ability to escape `#` in rust documentation][41785] By adding
5400 additional `#`'s ie. `##` is now `#`
5405 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5406 - [`-Z` flags are now no longer allowed to be used on the stable
5407 compiler.][41751] This has been a warning for a year previous to this.
5408 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5409 longer works][42844]. Users should migrate to the built-in `check`
5410 command, which has been available since 1.16.
5411 - [Ending a float literal with `._` is now a hard error.
5412 Example: `42._` .][41946]
5413 - [Any use of a private `extern crate` outside of its module is now a
5414 hard error.][36886] This was previously a warning.
5415 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5416 relative while the `::` prefix makes a path absolute, but was ignored and the
5417 path was relative regardless.
5418 - [Floating point constants in match patterns is now a hard error][36890]
5419 This was previously a warning.
5420 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5421 match patterns is now a hard error][36891] This was previously a warning.
5422 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5424 - [From the pound escape, lines consisting of multiple `#`s are
5426 - [It is an error to re-export private enum variants][42460]. This is
5427 known to break a number of crates that depend on an older version of
5429 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5430 to use it to find the linker, and the build will fail where it did
5431 not previously][42607]
5433 [36886]: https://github.com/rust-lang/rust/issues/36886
5434 [36888]: https://github.com/rust-lang/rust/issues/36888
5435 [36890]: https://github.com/rust-lang/rust/issues/36890
5436 [36891]: https://github.com/rust-lang/rust/issues/36891
5437 [36892]: https://github.com/rust-lang/rust/issues/36892
5438 [37406]: https://github.com/rust-lang/rust/issues/37406
5439 [39983]: https://github.com/rust-lang/rust/pull/39983
5440 [41145]: https://github.com/rust-lang/rust/pull/41145
5441 [41192]: https://github.com/rust-lang/rust/pull/41192
5442 [41258]: https://github.com/rust-lang/rust/pull/41258
5443 [41370]: https://github.com/rust-lang/rust/pull/41370
5444 [41449]: https://github.com/rust-lang/rust/pull/41449
5445 [41530]: https://github.com/rust-lang/rust/pull/41530
5446 [41624]: https://github.com/rust-lang/rust/pull/41624
5447 [41656]: https://github.com/rust-lang/rust/pull/41656
5448 [41659]: https://github.com/rust-lang/rust/pull/41659
5449 [41676]: https://github.com/rust-lang/rust/pull/41676
5450 [41751]: https://github.com/rust-lang/rust/pull/41751
5451 [41764]: https://github.com/rust-lang/rust/pull/41764
5452 [41785]: https://github.com/rust-lang/rust/pull/41785
5453 [41873]: https://github.com/rust-lang/rust/pull/41873
5454 [41907]: https://github.com/rust-lang/rust/pull/41907
5455 [41946]: https://github.com/rust-lang/rust/pull/41946
5456 [42016]: https://github.com/rust-lang/rust/pull/42016
5457 [42037]: https://github.com/rust-lang/rust/pull/42037
5458 [42068]: https://github.com/rust-lang/rust/pull/42068
5459 [42150]: https://github.com/rust-lang/rust/pull/42150
5460 [42162]: https://github.com/rust-lang/rust/pull/42162
5461 [42225]: https://github.com/rust-lang/rust/pull/42225
5462 [42264]: https://github.com/rust-lang/rust/pull/42264
5463 [42302]: https://github.com/rust-lang/rust/pull/42302
5464 [42460]: https://github.com/rust-lang/rust/issues/42460
5465 [42607]: https://github.com/rust-lang/rust/issues/42607
5466 [42740]: https://github.com/rust-lang/rust/pull/42740
5467 [42844]: https://github.com/rust-lang/rust/issues/42844
5468 [42948]: https://github.com/rust-lang/rust/pull/42948
5469 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5470 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5471 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5472 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5473 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5474 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5475 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5476 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5477 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5478 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5479 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5480 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5481 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5482 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5483 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5484 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5485 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5486 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5487 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5488 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5489 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5490 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5493 Version 1.18.0 (2017-06-08)
5494 ===========================
5499 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5500 make the item visible to just that module tree. Also accepts the keyword
5501 `crate` to make something public to the whole crate but not users of the
5502 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5503 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5504 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5505 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5506 types like `Write + Send`, trailing `+` are now supported in trait objects,
5507 and better error reporting for trait objects starting with `?Sized`.
5508 - [0e+10 is now a valid floating point literal][40589]
5509 - [Now warns if you bind a lifetime parameter to 'static][40734]
5510 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5511 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5512 representation in some cases.][40377]
5517 - [rustc can now emit mir with `--emit mir`][39891]
5518 - [Improved LLVM IR for trivial functions][40367]
5519 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5520 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5521 opportunities found through profiling
5522 - [Improved backtrace formatting when panicking][38165]
5527 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5528 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5529 iteration or reallocation.
5530 - [Simplified HashMap Bucket interface][40561] provides performance
5531 improvements for iterating and cloning.
5532 - [Specialize Vec::from_elem to use calloc][40409]
5533 - [Fixed Race condition in fs::create_dir_all][39799]
5534 - [No longer caching stdio on Windows][40516]
5535 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5536 2.50%~ faster and in one case now 12.50% faster.
5537 - [Optimized `AtomicBool::fetch_nand`][41143]
5542 - [`Child::try_wait`]
5543 - [`HashMap::retain`]
5544 - [`HashSet::retain`]
5546 - [`TcpStream::peek`]
5547 - [`UdpSocket::peek`]
5548 - [`UdpSocket::peek_from`]
5553 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5554 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5555 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5556 - [Added Android build support][cargo/3885]
5557 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5558 of a certain type, for example `cargo build --bins` will build all
5560 - [Added support for haiku][cargo/3952]
5565 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5566 - [Added rust-windbg script for better debugging on Windows][39983]
5567 - [Rust now uses the official cross compiler for NetBSD][40612]
5568 - [rustdoc now accepts `#` at the start of files][40828]
5569 - [Fixed jemalloc support for musl][41168]
5574 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5575 always placed after the sign if it exists and before the digits. With the `#`
5576 flag the zeroes are placed after the prefix and before the digits.
5577 - [Due to the struct field optimisation][40377], using `transmute` on structs
5578 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5579 always been undefined behavior, but is now more likely to break in practice.
5580 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5581 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5582 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5583 - [Overlapping inherent `impl`s are now a hard error][40728]
5584 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5585 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5586 `out.asm` and `out.ll` instead of only one of the filetypes.
5587 - [ calling a function that returns `Self` will no longer work][41805] when
5588 the size of `Self` cannot be statically determined.
5589 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5590 this has caused a few regressions namely:
5592 - Changed the link order of local static/dynamic libraries (respecting the
5593 order on given rather than having the compiler reorder).
5594 - Changed how MinGW is linked, native code linked to dynamic libraries
5595 may require manually linking to the gcc support library (for the native
5598 [38165]: https://github.com/rust-lang/rust/pull/38165
5599 [39799]: https://github.com/rust-lang/rust/pull/39799
5600 [39891]: https://github.com/rust-lang/rust/pull/39891
5601 [39983]: https://github.com/rust-lang/rust/pull/39983
5602 [40043]: https://github.com/rust-lang/rust/pull/40043
5603 [40241]: https://github.com/rust-lang/rust/pull/40241
5604 [40338]: https://github.com/rust-lang/rust/pull/40338
5605 [40367]: https://github.com/rust-lang/rust/pull/40367
5606 [40377]: https://github.com/rust-lang/rust/pull/40377
5607 [40409]: https://github.com/rust-lang/rust/pull/40409
5608 [40516]: https://github.com/rust-lang/rust/pull/40516
5609 [40556]: https://github.com/rust-lang/rust/pull/40556
5610 [40561]: https://github.com/rust-lang/rust/pull/40561
5611 [40589]: https://github.com/rust-lang/rust/pull/40589
5612 [40612]: https://github.com/rust-lang/rust/pull/40612
5613 [40723]: https://github.com/rust-lang/rust/pull/40723
5614 [40728]: https://github.com/rust-lang/rust/pull/40728
5615 [40731]: https://github.com/rust-lang/rust/pull/40731
5616 [40734]: https://github.com/rust-lang/rust/pull/40734
5617 [40805]: https://github.com/rust-lang/rust/pull/40805
5618 [40807]: https://github.com/rust-lang/rust/pull/40807
5619 [40828]: https://github.com/rust-lang/rust/pull/40828
5620 [40870]: https://github.com/rust-lang/rust/pull/40870
5621 [41085]: https://github.com/rust-lang/rust/pull/41085
5622 [41143]: https://github.com/rust-lang/rust/pull/41143
5623 [41168]: https://github.com/rust-lang/rust/pull/41168
5624 [41270]: https://github.com/rust-lang/rust/issues/41270
5625 [41469]: https://github.com/rust-lang/rust/pull/41469
5626 [41805]: https://github.com/rust-lang/rust/issues/41805
5627 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5628 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5629 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5630 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5631 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5632 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5633 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5634 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5635 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5636 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5637 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5638 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5639 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5640 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5643 Version 1.17.0 (2017-04-27)
5644 ===========================
5649 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5650 * [Fields of structs may be initialized without duplicating the field/variable
5651 names][39761]. [RFC 1682]
5652 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5653 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5654 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5655 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5656 `'b`. Soundness fix.
5657 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5658 * [Static variables may contain references to other statics][40027]
5663 * [Exit quickly on only `--emit dep-info`][40336]
5664 * [Make `-C relocation-model` more correctly determine whether the linker
5665 creates a position-independent executable][40245]
5666 * [Add `-C overflow-checks` to directly control whether integer overflow
5668 * [The rustc type checker now checks items on demand instead of in a single
5669 in-order pass][40008]. This is mostly an internal refactoring in support of
5670 future work, including incremental type checking, but also resolves [RFC
5671 1647], allowing `Self` to appear in `impl` `where` clauses.
5672 * [Optimize vtable loads][39995]
5673 * [Turn off vectorization for Emscripten targets][39990]
5674 * [Provide suggestions for unknown macros imported with `use`][39953]
5675 * [Fix ICEs in path resolution][39939]
5676 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5677 * [Add clearer error message using `&str + &str`][39116]
5688 * [`Ordering::then`]
5689 * [`Ordering::then_with`]
5690 * [`BTreeMap::range`]
5691 * [`BTreeMap::range_mut`]
5692 * [`collections::Bound`]
5693 * [`process::abort`]
5694 * [`ptr::read_unaligned`]
5695 * [`ptr::write_unaligned`]
5696 * [`Result::expect_err`]
5699 * [`Cell::into_inner`]
5705 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5706 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5707 * [`String` implements `FromIterator<&char>`][40028]
5708 * `Box` [implements][40009] a number of new conversions:
5709 `From<Box<str>> for String`,
5710 `From<Box<[T]>> for Vec<T>`,
5711 `From<Box<CStr>> for CString`,
5712 `From<Box<OsStr>> for OsString`,
5713 `From<Box<Path>> for PathBuf`,
5714 `Into<Box<str>> for String`,
5715 `Into<Box<[T]>> for Vec<T>`,
5716 `Into<Box<CStr>> for CString`,
5717 `Into<Box<OsStr>> for OsString`,
5718 `Into<Box<Path>> for PathBuf`,
5719 `Default for Box<str>`,
5720 `Default for Box<CStr>`,
5721 `Default for Box<OsStr>`,
5722 `From<&CStr> for Box<CStr>`,
5723 `From<&OsStr> for Box<OsStr>`,
5724 `From<&Path> for Box<Path>`
5725 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5726 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5727 * [Slightly optimize `slice::sort`][39538]
5728 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5729 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5730 `Box<str>` implements `From<&str>`][39438]
5731 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5732 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5733 * [`format!` estimates the needed capacity before writing a string][39356]
5734 * [Support unprivileged symlink creation in Windows][38921]
5735 * [`PathBuf` implements `Default`][38764]
5736 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5737 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5738 and poor hash functions.
5743 * [Add `cargo check --all`][cargo/3731]
5744 * [Add an option to ignore SSL revocation checking][cargo/3699]
5745 * [Add `cargo run --package`][cargo/3691]
5746 * [Add `required_features`][cargo/3667]
5747 * [Assume `build.rs` is a build script][cargo/3664]
5748 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5753 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5755 * [The "Unstable Book" documents nightly-only features][ubook]
5756 * [Improve the style of the sidebar in rustdoc output][40265]
5757 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5758 * [Fix MSP430 breakage due to `i128`][40257]
5759 * [Preliminary Solaris/SPARCv9 support][39903]
5760 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5761 run without installing the MSVC runtime.
5762 * [`rustdoc --test` includes file names in test names][39788]
5763 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5764 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5765 * [Initial support for `aarch64-unknown-freebsd`][39491]
5766 * [Initial support for `i686-unknown-netbsd`][39426]
5767 * [This release no longer includes the old makefile build system][39431]. Rust
5768 is built with a custom build system, written in Rust, and with Cargo.
5769 * [Add Debug implementations for libcollection structs][39002]
5770 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5771 * [`--test-threads=0` produces an error][38945]
5772 * [`rustup` installs documentation by default][40526]
5773 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5774 WinDbg and Visual Studio to improve the debugging experience.
5779 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5780 workaround, either use MSVC 2015 or run vcvars.bat.
5781 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5782 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5783 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5785 * [`format!` and `Display::to_string` panic if an underlying formatting
5786 implementation returns an error][40117]. Previously the error was silently
5787 ignored. It is incorrect for `write_fmt` to return an error when writing
5789 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5790 crates were marked stable and could be accessed from the stable toolchain.
5791 * [Rust git source no longer includes vendored crates][39728]. Those that need
5792 to build with vendored crates should build from release tarballs.
5793 * [Fix inert attributes from `proc_macro_derives`][39572]
5794 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5795 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5797 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5798 existing code generally ignores the type of dead-code unless a type-hint is
5799 provided; this can cause surprising inference interactions particularly around
5800 defaulting. The new code uniformly ignores the result type of dead-code.
5801 * [Tuple-struct constructors with private fields are no longer visible][38932]
5802 * [Lifetime parameters that do not appear in the arguments are now considered
5803 early-bound][38897], resolving a soundness bug (#[32330]). The
5804 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5806 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5807 * [Make transmuting from fn item types to pointer-sized types a hard
5810 [27787]: https://github.com/rust-lang/rust/issues/27787
5811 [32330]: https://github.com/rust-lang/rust/issues/32330
5812 [34198]: https://github.com/rust-lang/rust/pull/34198
5813 [38161]: https://github.com/rust-lang/rust/pull/38161
5814 [38368]: https://github.com/rust-lang/rust/pull/38368
5815 [38584]: https://github.com/rust-lang/rust/issues/38584
5816 [38661]: https://github.com/rust-lang/rust/pull/38661
5817 [38764]: https://github.com/rust-lang/rust/pull/38764
5818 [38864]: https://github.com/rust-lang/rust/issues/38864
5819 [38897]: https://github.com/rust-lang/rust/pull/38897
5820 [38921]: https://github.com/rust-lang/rust/pull/38921
5821 [38932]: https://github.com/rust-lang/rust/pull/38932
5822 [38945]: https://github.com/rust-lang/rust/pull/38945
5823 [38981]: https://github.com/rust-lang/rust/pull/38981
5824 [39002]: https://github.com/rust-lang/rust/pull/39002
5825 [39116]: https://github.com/rust-lang/rust/pull/39116
5826 [39193]: https://github.com/rust-lang/rust/pull/39193
5827 [39265]: https://github.com/rust-lang/rust/pull/39265
5828 [39356]: https://github.com/rust-lang/rust/pull/39356
5829 [39372]: https://github.com/rust-lang/rust/pull/39372
5830 [39426]: https://github.com/rust-lang/rust/pull/39426
5831 [39431]: https://github.com/rust-lang/rust/pull/39431
5832 [39438]: https://github.com/rust-lang/rust/pull/39438
5833 [39440]: https://github.com/rust-lang/rust/pull/39440
5834 [39485]: https://github.com/rust-lang/rust/pull/39485
5835 [39491]: https://github.com/rust-lang/rust/pull/39491
5836 [39518]: https://github.com/rust-lang/rust/pull/39518
5837 [39538]: https://github.com/rust-lang/rust/pull/39538
5838 [39572]: https://github.com/rust-lang/rust/pull/39572
5839 [39633]: https://github.com/rust-lang/rust/pull/39633
5840 [39642]: https://github.com/rust-lang/rust/pull/39642
5841 [39728]: https://github.com/rust-lang/rust/pull/39728
5842 [39761]: https://github.com/rust-lang/rust/pull/39761
5843 [39788]: https://github.com/rust-lang/rust/pull/39788
5844 [39793]: https://github.com/rust-lang/rust/pull/39793
5845 [39837]: https://github.com/rust-lang/rust/pull/39837
5846 [39843]: https://github.com/rust-lang/rust/pull/39843
5847 [39851]: https://github.com/rust-lang/rust/pull/39851
5848 [39903]: https://github.com/rust-lang/rust/pull/39903
5849 [39939]: https://github.com/rust-lang/rust/pull/39939
5850 [39953]: https://github.com/rust-lang/rust/pull/39953
5851 [39960]: https://github.com/rust-lang/rust/pull/39960
5852 [39990]: https://github.com/rust-lang/rust/pull/39990
5853 [39995]: https://github.com/rust-lang/rust/pull/39995
5854 [40008]: https://github.com/rust-lang/rust/pull/40008
5855 [40009]: https://github.com/rust-lang/rust/pull/40009
5856 [40027]: https://github.com/rust-lang/rust/pull/40027
5857 [40028]: https://github.com/rust-lang/rust/pull/40028
5858 [40037]: https://github.com/rust-lang/rust/pull/40037
5859 [40117]: https://github.com/rust-lang/rust/pull/40117
5860 [40166]: https://github.com/rust-lang/rust/pull/40166
5861 [40245]: https://github.com/rust-lang/rust/pull/40245
5862 [40257]: https://github.com/rust-lang/rust/pull/40257
5863 [40261]: https://github.com/rust-lang/rust/pull/40261
5864 [40265]: https://github.com/rust-lang/rust/pull/40265
5865 [40319]: https://github.com/rust-lang/rust/pull/40319
5866 [40336]: https://github.com/rust-lang/rust/pull/40336
5867 [40526]: https://github.com/rust-lang/rust/pull/40526
5868 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5869 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5870 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5871 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5872 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5873 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5874 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5875 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5876 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5877 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5878 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5879 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5880 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5881 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5882 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5883 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5884 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5885 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5886 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5887 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5888 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5889 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5890 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5891 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5892 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5893 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5894 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5895 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5896 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5897 [mdbook]: https://crates.io/crates/mdbook
5898 [ubook]: https://doc.rust-lang.org/unstable-book/
5901 Version 1.16.0 (2017-03-16)
5902 ===========================
5907 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5908 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5909 match patterns][38069]
5910 * [Clean up semantics of `self` in an import list][38313]
5911 * [`Self` may appear in `impl` headers][38920]
5912 * [`Self` may appear in struct expressions][39282]
5917 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5918 a `.rmeta` file containing only crate metadata][38571]. This can be
5919 used by tools like the Rust Language Service to perform
5920 metadata-only builds.
5921 * [Levenshtein based typo suggestions now work in most places, while
5922 previously they worked only for fields and sometimes for local
5923 variables][38927]. Together with the overhaul of "no
5924 resolution"/"unexpected resolution" errors (#[38154]) they result in
5925 large and systematic improvement in resolution diagnostics.
5926 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5928 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5929 * [`rustc` no longer attempts to provide "consider using an explicit
5930 lifetime" suggestions][37057]. They were inaccurate.
5935 * [`VecDeque::truncate`]
5936 * [`VecDeque::resize`]
5937 * [`String::insert_str`]
5938 * [`Duration::checked_add`]
5939 * [`Duration::checked_sub`]
5940 * [`Duration::checked_div`]
5941 * [`Duration::checked_mul`]
5944 * [`SocketAddr::is_ipv4`]
5945 * [`SocketAddr::is_ipv6`]
5946 * [`IpAddr::is_ipv4`]
5947 * [`IpAddr::is_ipv6`]
5949 * [`Vec::dedup_by_key`]
5950 * [`Result::unwrap_or_default`]
5951 * [`<*const T>::wrapping_offset`]
5952 * [`<*mut T>::wrapping_offset`]
5953 * `CommandExt::creation_flags`
5954 * [`File::set_permissions`]
5955 * [`String::split_off`]
5960 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5961 their argument by `Borrow` parameter][37761]
5962 * [All public types in std implement `Debug`][38006]
5963 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5964 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5965 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5967 * [std: Fix partial writes in `LineWriter`][38062]
5968 * [std: Clamp max read/write sizes on Unix][38062]
5969 * [Use more specific panic message for `&str` slicing errors][38066]
5970 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5971 functionality cannot be achieved in std currently.
5972 * [`writeln!`, like `println!`, now accepts a form with no string
5973 or formatting arguments, to just print a newline][38469]
5974 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5975 * [Reduce the size of static data in `std_unicode::tables`][38781]
5976 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5977 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5979 * [`Duration` implements `Sum`][38712]
5980 * [`String` implements `ToSocketAddrs`][39048]
5985 * [The `cargo check` command does a type check of a project without
5986 building it][cargo/3296]
5987 * [crates.io will display CI badges from Travis and AppVeyor, if
5988 specified in Cargo.toml][cargo/3546]
5989 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5990 * [Compilation profiles accept integer values for `debug`, in addition
5991 to `true` and `false`. These are passed to `rustc` as the value to
5992 `-C debuginfo`][cargo/3534]
5993 * [Implement `cargo --version --verbose`][cargo/3604]
5994 * [All builds now output 'dep-info' build dependencies compatible with
5995 make and ninja][cargo/3557]
5996 * [Build all workspace members with `build --all`][cargo/3511]
5997 * [Document all workspace members with `doc --all`][cargo/3515]
5998 * [Path deps outside workspace are not members][cargo/3443]
6003 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6004 the path to the Rust implementation][38589]
6005 * [The `armv7-linux-androideabi` target no longer enables NEON
6006 extensions, per Google's ABI guide][38413]
6007 * [The stock standard library can be compiled for Redox OS][38401]
6008 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6010 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6012 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6017 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6018 match patterns][38069]
6019 * In this release, references to uninhabited types can not be
6020 pattern-matched. This was accidentally allowed in 1.15.
6021 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6022 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6024 * [Clean up semantics of `self` in an import list][38313]
6025 * Reimplemented lifetime elision. This change was almost entirely compatible
6026 with existing code, but it did close a number of small bugs and loopholes,
6027 as well as being more accepting in some other [cases][41105].
6029 [37057]: https://github.com/rust-lang/rust/pull/37057
6030 [37761]: https://github.com/rust-lang/rust/pull/37761
6031 [38006]: https://github.com/rust-lang/rust/pull/38006
6032 [38051]: https://github.com/rust-lang/rust/pull/38051
6033 [38062]: https://github.com/rust-lang/rust/pull/38062
6034 [38062]: https://github.com/rust-lang/rust/pull/38622
6035 [38066]: https://github.com/rust-lang/rust/pull/38066
6036 [38069]: https://github.com/rust-lang/rust/pull/38069
6037 [38131]: https://github.com/rust-lang/rust/pull/38131
6038 [38154]: https://github.com/rust-lang/rust/pull/38154
6039 [38274]: https://github.com/rust-lang/rust/pull/38274
6040 [38304]: https://github.com/rust-lang/rust/pull/38304
6041 [38313]: https://github.com/rust-lang/rust/pull/38313
6042 [38314]: https://github.com/rust-lang/rust/pull/38314
6043 [38327]: https://github.com/rust-lang/rust/pull/38327
6044 [38401]: https://github.com/rust-lang/rust/pull/38401
6045 [38413]: https://github.com/rust-lang/rust/pull/38413
6046 [38469]: https://github.com/rust-lang/rust/pull/38469
6047 [38559]: https://github.com/rust-lang/rust/pull/38559
6048 [38571]: https://github.com/rust-lang/rust/pull/38571
6049 [38580]: https://github.com/rust-lang/rust/pull/38580
6050 [38589]: https://github.com/rust-lang/rust/pull/38589
6051 [38670]: https://github.com/rust-lang/rust/pull/38670
6052 [38712]: https://github.com/rust-lang/rust/pull/38712
6053 [38726]: https://github.com/rust-lang/rust/pull/38726
6054 [38781]: https://github.com/rust-lang/rust/pull/38781
6055 [38798]: https://github.com/rust-lang/rust/pull/38798
6056 [38909]: https://github.com/rust-lang/rust/pull/38909
6057 [38920]: https://github.com/rust-lang/rust/pull/38920
6058 [38927]: https://github.com/rust-lang/rust/pull/38927
6059 [39048]: https://github.com/rust-lang/rust/pull/39048
6060 [39282]: https://github.com/rust-lang/rust/pull/39282
6061 [39379]: https://github.com/rust-lang/rust/pull/39379
6062 [41105]: https://github.com/rust-lang/rust/issues/41105
6063 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6064 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6065 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6066 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6067 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6068 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6069 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6070 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6071 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6072 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6073 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6074 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6075 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6076 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6077 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6078 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6079 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6080 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6081 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6082 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6083 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6084 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6085 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6086 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6087 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6088 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6089 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6090 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6091 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6092 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6095 Version 1.15.1 (2017-02-09)
6096 ===========================
6098 * [Fix IntoIter::as_mut_slice's signature][39466]
6099 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6101 [39466]: https://github.com/rust-lang/rust/pull/39466
6102 [39523]: https://github.com/rust-lang/rust/pull/39523
6105 Version 1.15.0 (2017-02-02)
6106 ===========================
6111 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6112 stable. This allows popular code-generating crates like Serde and Diesel to
6113 work ergonomically. [RFC 1681].
6114 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6115 with curly braces][36868]. Part of [RFC 1506].
6116 * [A number of minor changes to name resolution have been activated][37127].
6117 They add up to more consistent semantics, allowing for future evolution of
6118 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6119 details of what is different. The breaking changes here have been transitioned
6120 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6121 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6123 * [`?Sized` can be used in `where` clauses][37791]
6124 * [There is now a limit on the size of monomorphized types and it can be
6125 modified with the `#![type_size_limit]` crate attribute, similarly to
6126 the `#![recursion_limit]` attribute][37789]
6131 * [On Windows, the compiler will apply dllimport attributes when linking to
6132 extern functions][37973]. Additional attributes and flags can control which
6133 library kind is linked and its name. [RFC 1717].
6134 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6135 * [The `--test` flag works with procedural macro crates][38107]
6136 * [Fix `extern "aapcs" fn` ABI][37814]
6137 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6138 * [The `format!` expander recognizes incorrect `printf` and shell-style
6139 formatting directives and suggests the correct format][37613].
6140 * [Only report one error for all unused imports in an import list][37456]
6142 Compiler Performance
6143 --------------------
6145 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6146 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6147 * [Don't clone in `UnificationTable::probe`][37848]
6148 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6149 * [Use small vectors in type walker][37760]
6150 * [Macro expansion performance was improved][37701]
6151 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6152 * [Replace FNV with a faster hash function][37229]
6157 * [`std::iter::Iterator::min_by`]
6158 * [`std::iter::Iterator::max_by`]
6159 * [`std::os::*::fs::FileExt`]
6160 * [`std::sync::atomic::Atomic*::get_mut`]
6161 * [`std::sync::atomic::Atomic*::into_inner`]
6162 * [`std::vec::IntoIter::as_slice`]
6163 * [`std::vec::IntoIter::as_mut_slice`]
6164 * [`std::sync::mpsc::Receiver::try_iter`]
6165 * [`std::os::unix::process::CommandExt::before_exec`]
6166 * [`std::rc::Rc::strong_count`]
6167 * [`std::rc::Rc::weak_count`]
6168 * [`std::sync::Arc::strong_count`]
6169 * [`std::sync::Arc::weak_count`]
6170 * [`std::char::encode_utf8`]
6171 * [`std::char::encode_utf16`]
6172 * [`std::cell::Ref::clone`]
6173 * [`std::io::Take::into_inner`]
6178 * [The standard sorting algorithm has been rewritten for dramatic performance
6179 improvements][38192]. It is a hybrid merge sort, drawing influences from
6180 Timsort. Previously it was a naive merge sort.
6181 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6182 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6184 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6185 and `char_indices().last()`][37882]
6186 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6187 * [Chinese characters display correctly in `fmt::Debug`][37855]
6188 * [Derive `Default` for `Duration`][37699]
6189 * [Support creation of anonymous pipes on WinXP/2k][37677]
6190 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6191 * [Don't pass overlapped handles to processes][38835]
6196 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6197 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6198 should instead check the variable at runtime with `std::env`. That the value
6199 was set at build time was a bug, and incorrect when cross-compiling. This
6200 change is known to cause breakage.
6201 * [Add `--all` flag to `cargo test`][cargo/3221]
6202 * [Compile statically against the MSVC CRT][cargo/3363]
6203 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6204 * [Link OpenSSL statically on OSX][cargo/3311]
6205 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6206 * [Test for bad path overrides with summaries][cargo/3336]
6207 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6208 * [Fix retrying crate downloads for network errors][cargo/3348]
6209 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6210 * [Emit more info on --message-format=json][cargo/3319]
6211 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6212 * [Don't ignore errors in workspace manifest][cargo/3409]
6213 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6218 * [Test runners (binaries built with `--test`) now support a `--list` argument
6219 that lists the tests it contains][38185]
6220 * [Test runners now support a `--exact` argument that makes the test filter
6221 match exactly, instead of matching only a substring of the test name][38181]
6222 * [rustdoc supports a `--playground-url` flag][37763]
6223 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6228 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6229 continue to be used in this release by passing `--disable-rustbuild` to the
6230 configure script, but they will be deleted soon. Note that the new build
6231 system uses a different on-disk layout that will likely affect any scripts
6233 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6235 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6236 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6242 * [A number of minor changes to name resolution have been activated][37127].
6243 They add up to more consistent semantics, allowing for future evolution of
6244 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6245 details of what is different. The breaking changes here have been transitioned
6246 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6247 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6248 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6249 should instead check the variable at runtime with `std::env`. That the value
6250 was set at build time was a bug, and incorrect when cross-compiling. This
6251 change is known to cause breakage.
6252 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6253 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6254 1.10 and is now an error by default. It will become a hard error in the near
6256 * [The semantics relating modules to file system directories are changing in
6257 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6258 lint, which is a warning in this release, and will become a hard error in the
6260 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6261 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6262 the underlying iterator][37834]
6264 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6265 [33685]: https://github.com/rust-lang/rust/issues/33685
6266 [36868]: https://github.com/rust-lang/rust/pull/36868
6267 [37127]: https://github.com/rust-lang/rust/pull/37127
6268 [37229]: https://github.com/rust-lang/rust/pull/37229
6269 [37456]: https://github.com/rust-lang/rust/pull/37456
6270 [37527]: https://github.com/rust-lang/rust/pull/37527
6271 [37602]: https://github.com/rust-lang/rust/pull/37602
6272 [37613]: https://github.com/rust-lang/rust/pull/37613
6273 [37615]: https://github.com/rust-lang/rust/pull/37615
6274 [37636]: https://github.com/rust-lang/rust/pull/37636
6275 [37627]: https://github.com/rust-lang/rust/pull/37627
6276 [37642]: https://github.com/rust-lang/rust/pull/37642
6277 [37677]: https://github.com/rust-lang/rust/pull/37677
6278 [37699]: https://github.com/rust-lang/rust/pull/37699
6279 [37701]: https://github.com/rust-lang/rust/pull/37701
6280 [37705]: https://github.com/rust-lang/rust/pull/37705
6281 [37749]: https://github.com/rust-lang/rust/pull/37749
6282 [37760]: https://github.com/rust-lang/rust/pull/37760
6283 [37763]: https://github.com/rust-lang/rust/pull/37763
6284 [37764]: https://github.com/rust-lang/rust/pull/37764
6285 [37789]: https://github.com/rust-lang/rust/pull/37789
6286 [37791]: https://github.com/rust-lang/rust/pull/37791
6287 [37814]: https://github.com/rust-lang/rust/pull/37814
6288 [37817]: https://github.com/rust-lang/rust/pull/37817
6289 [37834]: https://github.com/rust-lang/rust/pull/37834
6290 [37848]: https://github.com/rust-lang/rust/pull/37848
6291 [37855]: https://github.com/rust-lang/rust/pull/37855
6292 [37882]: https://github.com/rust-lang/rust/pull/37882
6293 [37888]: https://github.com/rust-lang/rust/pull/37888
6294 [37973]: https://github.com/rust-lang/rust/pull/37973
6295 [37979]: https://github.com/rust-lang/rust/pull/37979
6296 [38086]: https://github.com/rust-lang/rust/pull/38086
6297 [38107]: https://github.com/rust-lang/rust/pull/38107
6298 [38117]: https://github.com/rust-lang/rust/pull/38117
6299 [38134]: https://github.com/rust-lang/rust/pull/38134
6300 [38146]: https://github.com/rust-lang/rust/pull/38146
6301 [38181]: https://github.com/rust-lang/rust/pull/38181
6302 [38182]: https://github.com/rust-lang/rust/pull/38182
6303 [38185]: https://github.com/rust-lang/rust/pull/38185
6304 [38192]: https://github.com/rust-lang/rust/pull/38192
6305 [38279]: https://github.com/rust-lang/rust/pull/38279
6306 [38835]: https://github.com/rust-lang/rust/pull/38835
6307 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6308 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6309 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6310 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6311 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6312 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6313 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6314 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6315 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6316 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6317 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6318 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6319 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6320 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6321 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6322 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6323 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6324 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6325 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6326 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6327 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6328 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6329 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6330 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6331 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6332 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6333 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6334 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6335 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6336 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6337 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6338 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6339 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6340 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6341 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6342 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6343 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6344 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6347 Version 1.14.0 (2016-12-22)
6348 ===========================
6353 * [`..` matches multiple tuple fields in enum variants, structs
6354 and tuples][36843]. [RFC 1492].
6355 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6356 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6357 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6358 dereferencing][36822]
6363 * [Mark enums with non-zero discriminant as non-zero][37224]
6364 * [Lower-case `static mut` names are linted like other
6365 statics and consts][37162]
6366 * [Fix ICE on some macros in const integer positions
6367 (e.g. `[u8; m!()]`)][36819]
6368 * [Improve error message and snippet for "did you mean `x`"][36798]
6369 * [Add a panic-strategy field to the target specification][36794]
6370 * [Include LLVM version in `--version --verbose`][37200]
6372 Compile-time Optimizations
6373 --------------------------
6375 * [Improve macro expansion performance][37569]
6376 * [Shrink `Expr_::ExprInlineAsm`][37445]
6377 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6378 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6379 * [Avoid more allocations when compiling html5ever][37373]
6380 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6381 * [Avoid some allocations in the macro parser][37318]
6382 * [Use a faster deflate setting][37298]
6383 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6384 during interning of slices][37270]
6385 * [Optimize `write_metadata`][37267]
6386 * [Don't process obligation forest cycles when stalled][37231]
6387 * [Avoid many `CrateConfig` clones][37161]
6388 * [Optimize `Substs::super_fold_with`][37108]
6389 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6390 * [Speed up `plug_leaks`][36917]
6395 * [`println!()`, with no arguments, prints newline][36825].
6396 Previously, an empty string was required to achieve the same.
6397 * [`Wrapping` impls standard binary and unary operators, as well as
6398 the `Sum` and `Product` iterators][37356]
6399 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6401 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6402 `VecDeque` iterators][37315]
6403 * [Improve `SipHasher` performance on small values][37312]
6404 * [Add Iterator trait TrustedLen to enable better FromIterator /
6406 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6407 * [`ReadDir` implements `Debug`][37221]
6408 * [Implement `RefUnwindSafe` for atomic types][37178]
6409 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6410 * [Avoid allocations in `Decoder::read_str`][37064]
6411 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6412 * [Impl `Debug` for raw pointers to unsized data][36880]
6413 * [Don't reuse `HashMap` random seeds][37470]
6414 * [The internal memory layout of `HashMap` is more cache-friendly, for
6415 significant improvements in some operations][36692]
6416 * [`HashMap` uses less memory on 32-bit architectures][36595]
6417 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6422 * [Expose rustc cfg values to build scripts][cargo/3243]
6423 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6424 * [Fix passing --features when testing multiple packages][cargo/3280]
6425 * [Use a single profile set per workspace][cargo/3249]
6426 * [Load `replace` sections from lock files][cargo/3220]
6427 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6432 * [rustup is the recommended Rust installation method][1.14rustup]
6433 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6434 S390x. These are [tier 2] platforms and may have major defects. Follow the
6435 instructions on the website to install, or add the targets to an existing
6436 installation with `rustup target add`. The new target triples are:
6437 - `mips-unknown-linux-gnu`
6438 - `mipsel-unknown-linux-gnu`
6439 - `mips64-unknown-linux-gnuabi64`
6440 - `mips64el-unknown-linux-gnuabi64 `
6441 - `powerpc-unknown-linux-gnu`
6442 - `powerpc64-unknown-linux-gnu`
6443 - `powerpc64le-unknown-linux-gnu`
6444 - `s390x-unknown-linux-gnu `
6445 * This release includes target (std) builds for ARM Linux running MUSL
6446 libc. These are [tier 2] platforms and may have major defects. Add the
6447 following triples to an existing rustup installation with `rustup target add`:
6448 - `arm-unknown-linux-musleabi`
6449 - `arm-unknown-linux-musleabihf`
6450 - `armv7-unknown-linux-musleabihf`
6451 * This release includes [experimental support for WebAssembly][1.14wasm], via
6452 the `wasm32-unknown-emscripten` target. This target is known to have major
6453 defects. Please test, report, and fix.
6454 * rustup no longer installs documentation by default. Run `rustup
6455 component add rust-docs` to install.
6456 * [Fix line stepping in debugger][37310]
6457 * [Enable line number debuginfo in releases][37280]
6462 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6463 * [Add support for Fuchsia OS][37313]
6464 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6469 * [A number of forward-compatibility lints used by the compiler
6470 to gradually introduce language changes have been converted
6471 to deny by default][36894]:
6472 - ["use of inaccessible extern crate erroneously allowed"][36886]
6473 - ["type parameter default erroneously allowed in invalid location"][36887]
6474 - ["detects super or self keywords at the beginning of global path"][36888]
6475 - ["two overlapping inherent impls define an item with the same name
6476 were erroneously allowed"][36889]
6477 - ["floating-point constants cannot be used in patterns"][36890]
6478 - ["constants of struct or enum type can only be used in a pattern if
6479 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6480 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6481 * [Prohibit patterns in trait methods without bodies][37378]
6482 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6483 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6484 * [The `$crate` macro variable is accepted in fewer locations][37213]
6485 * [Impls specifying extra region requirements beyond the trait
6486 they implement are rejected][37167]
6487 * [Enums may not be unsized][37111]. Unsized enums are intended to
6488 work but never have. For now they are forbidden.
6489 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6491 [tier 2]: https://forge.rust-lang.org/platform-support.html
6492 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6493 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6494 [36430]: https://github.com/rust-lang/rust/pull/36430
6495 [36595]: https://github.com/rust-lang/rust/pull/36595
6496 [36595]: https://github.com/rust-lang/rust/pull/36595
6497 [36692]: https://github.com/rust-lang/rust/pull/36692
6498 [36767]: https://github.com/rust-lang/rust/pull/36767
6499 [36794]: https://github.com/rust-lang/rust/pull/36794
6500 [36798]: https://github.com/rust-lang/rust/pull/36798
6501 [36819]: https://github.com/rust-lang/rust/pull/36819
6502 [36822]: https://github.com/rust-lang/rust/pull/36822
6503 [36825]: https://github.com/rust-lang/rust/pull/36825
6504 [36843]: https://github.com/rust-lang/rust/pull/36843
6505 [36880]: https://github.com/rust-lang/rust/pull/36880
6506 [36886]: https://github.com/rust-lang/rust/issues/36886
6507 [36887]: https://github.com/rust-lang/rust/issues/36887
6508 [36888]: https://github.com/rust-lang/rust/issues/36888
6509 [36889]: https://github.com/rust-lang/rust/issues/36889
6510 [36890]: https://github.com/rust-lang/rust/issues/36890
6511 [36891]: https://github.com/rust-lang/rust/issues/36891
6512 [36892]: https://github.com/rust-lang/rust/issues/36892
6513 [36894]: https://github.com/rust-lang/rust/pull/36894
6514 [36917]: https://github.com/rust-lang/rust/pull/36917
6515 [36993]: https://github.com/rust-lang/rust/pull/36993
6516 [37037]: https://github.com/rust-lang/rust/pull/37037
6517 [37064]: https://github.com/rust-lang/rust/pull/37064
6518 [37094]: https://github.com/rust-lang/rust/pull/37094
6519 [37108]: https://github.com/rust-lang/rust/pull/37108
6520 [37111]: https://github.com/rust-lang/rust/pull/37111
6521 [37161]: https://github.com/rust-lang/rust/pull/37161
6522 [37162]: https://github.com/rust-lang/rust/pull/37162
6523 [37167]: https://github.com/rust-lang/rust/pull/37167
6524 [37178]: https://github.com/rust-lang/rust/pull/37178
6525 [37200]: https://github.com/rust-lang/rust/pull/37200
6526 [37213]: https://github.com/rust-lang/rust/pull/37213
6527 [37221]: https://github.com/rust-lang/rust/pull/37221
6528 [37224]: https://github.com/rust-lang/rust/pull/37224
6529 [37230]: https://github.com/rust-lang/rust/pull/37230
6530 [37231]: https://github.com/rust-lang/rust/pull/37231
6531 [37247]: https://github.com/rust-lang/rust/pull/37247
6532 [37267]: https://github.com/rust-lang/rust/pull/37267
6533 [37270]: https://github.com/rust-lang/rust/pull/37270
6534 [37273]: https://github.com/rust-lang/rust/pull/37273
6535 [37280]: https://github.com/rust-lang/rust/pull/37280
6536 [37298]: https://github.com/rust-lang/rust/pull/37298
6537 [37306]: https://github.com/rust-lang/rust/pull/37306
6538 [37310]: https://github.com/rust-lang/rust/pull/37310
6539 [37312]: https://github.com/rust-lang/rust/pull/37312
6540 [37313]: https://github.com/rust-lang/rust/pull/37313
6541 [37315]: https://github.com/rust-lang/rust/pull/37315
6542 [37318]: https://github.com/rust-lang/rust/pull/37318
6543 [37322]: https://github.com/rust-lang/rust/pull/37322
6544 [37326]: https://github.com/rust-lang/rust/pull/37326
6545 [37351]: https://github.com/rust-lang/rust/pull/37351
6546 [37356]: https://github.com/rust-lang/rust/pull/37356
6547 [37367]: https://github.com/rust-lang/rust/pull/37367
6548 [37373]: https://github.com/rust-lang/rust/pull/37373
6549 [37378]: https://github.com/rust-lang/rust/pull/37378
6550 [37389]: https://github.com/rust-lang/rust/pull/37389
6551 [37392]: https://github.com/rust-lang/rust/pull/37392
6552 [37427]: https://github.com/rust-lang/rust/pull/37427
6553 [37439]: https://github.com/rust-lang/rust/pull/37439
6554 [37445]: https://github.com/rust-lang/rust/pull/37445
6555 [37470]: https://github.com/rust-lang/rust/pull/37470
6556 [37569]: https://github.com/rust-lang/rust/pull/37569
6557 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6558 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6559 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6560 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6561 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6562 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6563 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6566 Version 1.13.0 (2016-11-10)
6567 ===========================
6572 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6573 errors, like the `try!` macro, described in [RFC 0243].
6574 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6575 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6576 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6577 * [Fix lifetime rules for 'if' conditions][36029]
6578 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6583 * [Add the `-C link-arg` argument][36574]
6584 * [Remove the old AST-based backend from rustc_trans][35764]
6585 * [Don't enable NEON by default on armv7 Linux][35814]
6586 * [Fix debug line number info for macro expansions][35238]
6587 * [Do not emit "class method" debuginfo for types that are not
6588 DICompositeType][36008]
6589 * [Warn about multiple conflicting #[repr] hints][34623]
6590 * [When sizing DST, don't double-count nested struct prefixes][36351]
6591 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6592 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6593 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6594 * [Expand macros without recursing to avoid stack overflows][36214]
6599 * [Replace macro backtraces with labeled local uses][35702]
6600 * [Improve error message for misplaced doc comments][33922]
6601 * [Buffer unix and lock windows to prevent message interleaving][35975]
6602 * [Update lifetime errors to specifically note temporaries][36171]
6603 * [Special case a few colors for Windows][36178]
6604 * [Suggest `use self` when such an import resolves][36289]
6605 * [Be more specific when type parameter shadows primitive type][36338]
6606 * Many minor improvements
6608 Compile-time Optimizations
6609 --------------------------
6611 * [Compute and cache HIR hashes at beginning][35854]
6612 * [Don't hash types in loan paths][36004]
6613 * [Cache projections in trans][35761]
6614 * [Optimize the parser's last token handling][36527]
6615 * [Only instantiate #[inline] functions in codegen units referencing
6616 them][36524]. This leads to big improvements in cases where crates export
6617 define many inline functions without using them directly.
6618 * [Lazily allocate TypedArena's first chunk][36592]
6619 * [Don't allocate during default HashSet creation][36734]
6626 * [`overflowing_abs`]
6627 * [`RefCell::try_borrow`]
6628 * [`RefCell::try_borrow_mut`]
6633 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6634 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6636 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6637 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6638 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6639 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6640 * [Use arc4rand on FreeBSD][35884]
6641 * [memrchr: Correct aligned offset computation][35969]
6642 * [Improve Demangling of Rust Symbols][36059]
6643 * [Use monotonic time in condition variables][35048]
6644 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6645 * [Implement conversion traits for `char`][35755]
6646 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6647 * [Zero first byte of CString on drop][36264]
6648 * [Inherit overflow checks for sum and product][36372]
6649 * [Add missing Eq implementations][36423]
6650 * [Implement `Debug` for `DirEntry`][36631]
6651 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6653 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6654 * [Implement more traits for `std::io::ErrorKind`][35911]
6655 * [Optimize BinaryHeap bounds checking][36072]
6656 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6657 `extend_with_element`][36355]
6658 * [Fix overflow checking in unsigned pow()][34942]
6663 * This release includes security fixes to both curl and OpenSSL.
6664 * [Fix transitive doctests when panic=abort][cargo/3021]
6665 * [Add --all-features flag to cargo][cargo/3038]
6666 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6667 * [Don't parse the home directory more than once][cargo/3078]
6668 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6669 * [Update OpenSSL to 1.0.2j][cargo/3121]
6670 * [Add license and license_file to cargo metadata output][cargo/3110]
6671 * [Make crates-io registry URL optional in config; ignore all changes to
6672 source.crates-io][cargo/3089]
6673 * [Don't download dependencies from other platforms][cargo/3123]
6674 * [Build transitive dev-dependencies when needed][cargo/3125]
6675 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6676 * [Avoid updating registry when adding existing deps][cargo/3144]
6677 * [Warn about path overrides that won't work][cargo/3136]
6678 * [Use workspaces during `cargo install`][cargo/3146]
6679 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6680 * [Add --message-format flag][cargo/3000]
6681 * [Pass target environment for rustdoc][cargo/3205]
6682 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6683 * [Update curl and curl-sys][cargo/3241]
6684 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6689 * [rustdoc: Add the `--sysroot` argument][36586]
6690 * [rustdoc: Fix a couple of issues with the search results][35655]
6691 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6692 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6693 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6698 * [Remove unmaintained style guide][35124]
6699 * [Add s390x support][36369]
6700 * [Initial work at Haiku OS support][36727]
6701 * [Add mips-uclibc targets][35734]
6702 * [Crate-ify compiler-rt into compiler-builtins][35021]
6703 * [Add rustc version info (git hash + date) to dist tarball][36213]
6704 * Many documentation improvements
6709 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6710 * [Deny (by default) transmuting from fn item types to pointer-sized
6711 types][34923]. Continuing the long transition to zero-sized fn items,
6713 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6715 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6716 * [Fix lifetime rules for 'if' conditions][36029].
6717 * [Inherit overflow checks for sum and product][36372].
6718 * [Forbid user-defined macros named "macro_rules"][36730].
6720 [33922]: https://github.com/rust-lang/rust/pull/33922
6721 [34623]: https://github.com/rust-lang/rust/pull/34623
6722 [34923]: https://github.com/rust-lang/rust/pull/34923
6723 [34942]: https://github.com/rust-lang/rust/pull/34942
6724 [34982]: https://github.com/rust-lang/rust/pull/34982
6725 [35021]: https://github.com/rust-lang/rust/pull/35021
6726 [35048]: https://github.com/rust-lang/rust/pull/35048
6727 [35074]: https://github.com/rust-lang/rust/pull/35074
6728 [35124]: https://github.com/rust-lang/rust/pull/35124
6729 [35234]: https://github.com/rust-lang/rust/pull/35234
6730 [35238]: https://github.com/rust-lang/rust/pull/35238
6731 [35354]: https://github.com/rust-lang/rust/pull/35354
6732 [35559]: https://github.com/rust-lang/rust/pull/35559
6733 [35585]: https://github.com/rust-lang/rust/pull/35585
6734 [35627]: https://github.com/rust-lang/rust/pull/35627
6735 [35655]: https://github.com/rust-lang/rust/pull/35655
6736 [35702]: https://github.com/rust-lang/rust/pull/35702
6737 [35707]: https://github.com/rust-lang/rust/pull/35707
6738 [35728]: https://github.com/rust-lang/rust/pull/35728
6739 [35734]: https://github.com/rust-lang/rust/pull/35734
6740 [35755]: https://github.com/rust-lang/rust/pull/35755
6741 [35761]: https://github.com/rust-lang/rust/pull/35761
6742 [35764]: https://github.com/rust-lang/rust/pull/35764
6743 [35814]: https://github.com/rust-lang/rust/pull/35814
6744 [35854]: https://github.com/rust-lang/rust/pull/35854
6745 [35871]: https://github.com/rust-lang/rust/pull/35871
6746 [35884]: https://github.com/rust-lang/rust/pull/35884
6747 [35911]: https://github.com/rust-lang/rust/pull/35911
6748 [35969]: https://github.com/rust-lang/rust/pull/35969
6749 [35975]: https://github.com/rust-lang/rust/pull/35975
6750 [36004]: https://github.com/rust-lang/rust/pull/36004
6751 [36008]: https://github.com/rust-lang/rust/pull/36008
6752 [36014]: https://github.com/rust-lang/rust/pull/36014
6753 [36029]: https://github.com/rust-lang/rust/pull/36029
6754 [36059]: https://github.com/rust-lang/rust/pull/36059
6755 [36072]: https://github.com/rust-lang/rust/pull/36072
6756 [36101]: https://github.com/rust-lang/rust/pull/36101
6757 [36104]: https://github.com/rust-lang/rust/pull/36104
6758 [36171]: https://github.com/rust-lang/rust/pull/36171
6759 [36173]: https://github.com/rust-lang/rust/pull/36173
6760 [36178]: https://github.com/rust-lang/rust/pull/36178
6761 [36213]: https://github.com/rust-lang/rust/pull/36213
6762 [36214]: https://github.com/rust-lang/rust/pull/36214
6763 [36264]: https://github.com/rust-lang/rust/pull/36264
6764 [36266]: https://github.com/rust-lang/rust/pull/36266
6765 [36289]: https://github.com/rust-lang/rust/pull/36289
6766 [36338]: https://github.com/rust-lang/rust/pull/36338
6767 [36351]: https://github.com/rust-lang/rust/pull/36351
6768 [36355]: https://github.com/rust-lang/rust/pull/36355
6769 [36369]: https://github.com/rust-lang/rust/pull/36369
6770 [36372]: https://github.com/rust-lang/rust/pull/36372
6771 [36423]: https://github.com/rust-lang/rust/pull/36423
6772 [36482]: https://github.com/rust-lang/rust/pull/36482
6773 [36505]: https://github.com/rust-lang/rust/pull/36505
6774 [36524]: https://github.com/rust-lang/rust/pull/36524
6775 [36527]: https://github.com/rust-lang/rust/pull/36527
6776 [36551]: https://github.com/rust-lang/rust/pull/36551
6777 [36574]: https://github.com/rust-lang/rust/pull/36574
6778 [36586]: https://github.com/rust-lang/rust/pull/36586
6779 [36592]: https://github.com/rust-lang/rust/pull/36592
6780 [36631]: https://github.com/rust-lang/rust/pull/36631
6781 [36639]: https://github.com/rust-lang/rust/pull/36639
6782 [36721]: https://github.com/rust-lang/rust/pull/36721
6783 [36727]: https://github.com/rust-lang/rust/pull/36727
6784 [36730]: https://github.com/rust-lang/rust/pull/36730
6785 [36734]: https://github.com/rust-lang/rust/pull/36734
6786 [36754]: https://github.com/rust-lang/rust/pull/36754
6787 [36995]: https://github.com/rust-lang/rust/pull/36995
6788 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6789 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6790 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6791 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6792 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6793 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6794 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6795 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6796 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6797 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6798 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6799 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6800 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6801 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6802 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6803 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6804 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6805 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6806 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6807 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6808 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6809 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6810 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6811 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6812 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6813 [rustup]: https://www.rustup.rs
6814 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6815 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6816 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6817 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6818 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6819 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6820 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6823 Version 1.12.1 (2016-10-20)
6824 ===========================
6829 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6830 * [Confusion with double negation and booleans][36856]
6831 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6832 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6833 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6834 * [Corrupted memory after updated to 1.12][36936]
6835 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6836 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6837 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6839 [36381]: https://github.com/rust-lang/rust/issues/36381
6840 [36856]: https://github.com/rust-lang/rust/issues/36856
6841 [36875]: https://github.com/rust-lang/rust/issues/36875
6842 [36924]: https://github.com/rust-lang/rust/issues/36924
6843 [36926]: https://github.com/rust-lang/rust/issues/36926
6844 [36936]: https://github.com/rust-lang/rust/issues/36936
6845 [37026]: https://github.com/rust-lang/rust/issues/37026
6846 [37112]: https://github.com/rust-lang/rust/issues/37112
6847 [37153]: https://github.com/rust-lang/rust/issues/37153
6850 Version 1.12.0 (2016-09-29)
6851 ===========================
6856 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6857 This translation pass is far simpler than the previous AST->LLVM pass, and
6858 creates opportunities to perform new optimizations directly on the MIR. It
6859 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6860 * [`rustc` presents a new, more readable error format, along with
6861 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6862 Most common editors supporting Rust have been updated to work with it. It was
6863 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6868 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6869 This translation pass is far simpler than the previous AST->LLVM pass, and
6870 creates opportunities to perform new optimizations directly on the MIR. It
6871 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6872 * [Print the Rust target name, not the LLVM target name, with
6873 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6874 * [The computation of `TypeId` is correct in some cases where it was previously
6875 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6876 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6877 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6878 `--print relocation-models`, and `--print code-models` print the available
6879 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6880 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6881 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6882 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6883 These targets produce statically-linked binaries. There are no binary release
6889 * [`rustc` presents a new, more readable error format, along with
6890 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6891 Most common editors supporting Rust have been updated to work with it. It was
6892 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6893 * [In error descriptions, references are now described in plain English,
6894 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6895 * [In error type descriptions, unknown numeric types are named `{integer}` or
6896 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6897 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6902 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6903 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6904 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6905 useful](https://github.com/rust-lang/rust/pull/34908)
6906 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6907 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6908 * [Semicolons are properly required as statement delimiters inside
6909 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6910 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6915 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6916 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6917 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6918 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6919 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6920 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6921 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6922 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6923 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6924 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6925 Both on Unix and Windows.
6926 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6927 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6928 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6929 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6930 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6931 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6932 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6933 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6938 * [The `format!` macro and friends now allow a single argument to be formatted
6939 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6940 * [The lifetime bounds on `[T]::binary_search_by` and
6941 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6942 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6943 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6944 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6945 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6946 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6947 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6948 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6949 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6950 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6951 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6952 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6953 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6954 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6955 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6956 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6957 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6958 * [`mpsc::sync_channel` `Receiver`s return any available message before
6959 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6960 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6961 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6966 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6967 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6968 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6969 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6970 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6971 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6972 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6973 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6974 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6975 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6976 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6977 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6978 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6979 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6980 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6981 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6986 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6987 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6992 * [Test binaries now support a `--test-threads` argument to specify the number
6993 of threads used to run tests, and which acts the same as the
6994 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6995 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6996 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6997 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6998 * [Rust releases now come with source packages that can be installed by rustup
6999 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7000 The resulting source code can be used by tools and IDES, located in the
7001 sysroot under `lib/rustlib/src`.
7006 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7007 * Many minor improvements to the documentation.
7008 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7013 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7014 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7015 * [When formatting strings, if "precision" is specified, the "fill",
7016 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7017 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7020 Version 1.11.0 (2016-08-18)
7021 ===========================
7026 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7027 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7028 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7029 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7034 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7035 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7036 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7037 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7038 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7039 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7040 (in libcore - previously stabilized in libstd)
7041 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7042 (in libcore - previously stabilized in libstd)
7043 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7044 (in libcore - previously stabilized in libstd)
7045 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7046 (in libcore - previously stabilized in libstd)
7047 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7048 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7049 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7050 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7055 * [The `thread_local!` macro supports multiple definitions in a single
7056 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7057 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7058 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7059 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7060 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7061 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7062 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7063 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7068 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7069 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7070 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7071 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7072 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7073 and `-vv` prints warnings for all crates.
7074 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7075 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7076 This provides room for expansion by arbitrary tools.
7077 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7078 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7079 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7080 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7081 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7082 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7083 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7088 * [Caching projections speeds up type check dramatically for some
7089 workloads](https://github.com/rust-lang/rust/pull/33816)
7090 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7091 This hasher is faster, but is believed to provide sufficient
7092 protection from collision attacks.
7093 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7098 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7099 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7100 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7101 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7102 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7107 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7108 * [When emitting debug info, rustc emits frame pointers for closures,
7109 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7110 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7111 * Many more errors have been given error codes and extended
7113 * API documentation continues to be improved, with many new examples
7118 * [rustc no longer hangs when dependencies recursively re-export
7119 submodules](https://github.com/rust-lang/rust/pull/34542)
7120 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7121 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7122 rewritten](https://github.com/rust-lang/rust/pull/33895)
7123 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7124 No targets use this yet, but it works toward AVR support.
7129 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7130 * [The new follow-set rules that place restrictions on `macro_rules!`
7131 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7132 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7133 and has been a warning since 1.10.
7134 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7135 This causes breakage in some corner cases.
7138 Version 1.10.0 (2016-07-07)
7139 ===========================
7144 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7145 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7146 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7147 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7148 * [`panic!` can be converted to a runtime abort with the
7149 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7150 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7151 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7152 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7153 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7154 Note that Cargo does not yet directly support cdylibs.
7159 * `os::windows::fs::OpenOptionsExt::access_mode`
7160 * `os::windows::fs::OpenOptionsExt::share_mode`
7161 * `os::windows::fs::OpenOptionsExt::custom_flags`
7162 * `os::windows::fs::OpenOptionsExt::attributes`
7163 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7164 * `os::unix::fs::OpenOptionsExt::custom_flags`
7165 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7166 * `Default for sync::Weak`
7167 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7168 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7169 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7170 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7171 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7172 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7173 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7174 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7175 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7176 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7177 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7178 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7179 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7180 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7181 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7182 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7183 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7184 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7185 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7186 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7187 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7188 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7189 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7190 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7191 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7192 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7193 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7194 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7195 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7196 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7197 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7198 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7199 * Read/Write/RawFd impls for `UnixStream`
7200 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7201 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7202 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7203 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7204 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7205 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7206 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7207 * RawFd impls for `UnixListener`
7208 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7209 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7210 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7211 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7212 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7213 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7214 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7215 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7216 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7217 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7218 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7219 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7220 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7221 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7222 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7223 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7224 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7225 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7226 * RawFd impls for `UnixDatagram`
7227 * `{BTree,Hash}Map::values_mut`
7228 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7233 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7234 The semantics of this minor method are subtle and probably not what
7236 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7237 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7238 will fall back to `/dev/urandom` temporarily to avoid blocking
7239 during early boot](https://github.com/rust-lang/rust/pull/33086).
7240 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7241 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7242 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7243 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7244 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7245 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7246 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7250 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7251 This controls the runtime behavior of the `panic!` macro
7252 and can be either "unwind" (the default), or "abort".
7253 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7254 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7255 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7256 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7257 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7258 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7259 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7260 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7261 By default they are retried twice, which can be customized with the
7262 `net.retry` value in `.cargo/config`.
7263 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7264 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7265 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7266 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7267 Makes it possible to install multiple crates in parallel.
7268 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7269 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7270 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7271 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7272 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7273 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7278 * [rustc memory usage was reduced by refactoring the context used for
7279 type checking](https://github.com/rust-lang/rust/pull/33425).
7280 * [Speed up creation of `HashMap`s by caching the random keys used
7281 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7282 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7283 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7284 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7285 10x faster than the previous lookup tables.
7286 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7291 * Many incremental improvements to documentation and rustdoc.
7292 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7293 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7294 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7295 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7296 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7297 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7298 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7303 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7304 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7305 * [`std` no longer prints backtraces on platforms where the running
7306 module must be loaded with `env::current_exe`, which can't be relied
7307 on](https://github.com/rust-lang/rust/pull/33554).
7308 * This release includes std binaries for the i586-unknown-linux-gnu,
7309 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7310 i586 target is for old x86 hardware without SSE2, and the armv7
7311 target is for Android running on modern ARM architectures.
7312 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7313 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7314 * [On Unix the runtime aborts by calling `libc::abort` instead of
7315 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7316 * [Rust is now bootstrapped from the previous release of Rust,
7317 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7322 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7323 * [`target_env` for Linux ARM targets is just `gnu`, not
7324 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7325 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7326 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7327 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7328 Affects how macros are parsed.
7329 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7330 * [Feature-gated attributes on macro-generated macro invocations are
7331 now rejected](https://github.com/rust-lang/rust/pull/32791).
7332 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7333 This caused some minor changes to type inference.
7336 Version 1.9.0 (2016-05-26)
7337 ==========================
7342 * The `#[deprecated]` attribute when applied to an API will generate
7343 warnings when used. The warnings may be suppressed with
7344 `#[allow(deprecated)]`. [RFC 1270].
7345 * [`fn` item types are zero sized, and each `fn` names a unique
7346 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7347 `transmute` on a `fn` type will generate a warning for a few cycles,
7348 then will be converted to an error.
7349 * [Field and method resolution understand visibility, so private
7350 fields and methods cannot prevent the proper use of public fields
7351 and methods][1.9fv].
7352 * [The parser considers unicode codepoints in the
7353 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7359 * [`std::panic::catch_unwind`] (renamed from `recover`)
7360 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7361 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7362 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7363 * [`str::is_char_boundary`]
7364 * [`<*const T>::as_ref`]
7365 * [`<*mut T>::as_ref`]
7366 * [`<*mut T>::as_mut`]
7367 * [`AsciiExt::make_ascii_uppercase`]
7368 * [`AsciiExt::make_ascii_lowercase`]
7369 * [`char::decode_utf16`]
7370 * [`char::DecodeUtf16`]
7371 * [`char::DecodeUtf16Error`]
7372 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7373 * [`BTreeSet::take`]
7374 * [`BTreeSet::replace`]
7377 * [`HashSet::replace`]
7379 * [`OsString::with_capacity`]
7380 * [`OsString::clear`]
7381 * [`OsString::capacity`]
7382 * [`OsString::reserve`]
7383 * [`OsString::reserve_exact`]
7384 * [`OsStr::is_empty`]
7386 * [`std::os::unix::thread`]
7389 * [`JoinHandleExt::as_pthread_t`]
7390 * [`JoinHandleExt::into_pthread_t`]
7391 * [`HashSet::hasher`]
7392 * [`HashMap::hasher`]
7393 * [`CommandExt::exec`]
7394 * [`File::try_clone`]
7395 * [`SocketAddr::set_ip`]
7396 * [`SocketAddr::set_port`]
7397 * [`SocketAddrV4::set_ip`]
7398 * [`SocketAddrV4::set_port`]
7399 * [`SocketAddrV6::set_ip`]
7400 * [`SocketAddrV6::set_port`]
7401 * [`SocketAddrV6::set_flowinfo`]
7402 * [`SocketAddrV6::set_scope_id`]
7403 * [`slice::copy_from_slice`]
7404 * [`ptr::read_volatile`]
7405 * [`ptr::write_volatile`]
7406 * [`OpenOptions::create_new`]
7407 * [`TcpStream::set_nodelay`]
7408 * [`TcpStream::nodelay`]
7409 * [`TcpStream::set_ttl`]
7410 * [`TcpStream::ttl`]
7411 * [`TcpStream::set_only_v6`]
7412 * [`TcpStream::only_v6`]
7413 * [`TcpStream::take_error`]
7414 * [`TcpStream::set_nonblocking`]
7415 * [`TcpListener::set_ttl`]
7416 * [`TcpListener::ttl`]
7417 * [`TcpListener::set_only_v6`]
7418 * [`TcpListener::only_v6`]
7419 * [`TcpListener::take_error`]
7420 * [`TcpListener::set_nonblocking`]
7421 * [`UdpSocket::set_broadcast`]
7422 * [`UdpSocket::broadcast`]
7423 * [`UdpSocket::set_multicast_loop_v4`]
7424 * [`UdpSocket::multicast_loop_v4`]
7425 * [`UdpSocket::set_multicast_ttl_v4`]
7426 * [`UdpSocket::multicast_ttl_v4`]
7427 * [`UdpSocket::set_multicast_loop_v6`]
7428 * [`UdpSocket::multicast_loop_v6`]
7429 * [`UdpSocket::set_multicast_ttl_v6`]
7430 * [`UdpSocket::multicast_ttl_v6`]
7431 * [`UdpSocket::set_ttl`]
7432 * [`UdpSocket::ttl`]
7433 * [`UdpSocket::set_only_v6`]
7434 * [`UdpSocket::only_v6`]
7435 * [`UdpSocket::join_multicast_v4`]
7436 * [`UdpSocket::join_multicast_v6`]
7437 * [`UdpSocket::leave_multicast_v4`]
7438 * [`UdpSocket::leave_multicast_v6`]
7439 * [`UdpSocket::take_error`]
7440 * [`UdpSocket::connect`]
7441 * [`UdpSocket::send`]
7442 * [`UdpSocket::recv`]
7443 * [`UdpSocket::set_nonblocking`]
7448 * [`std::sync::Once` is poisoned if its initialization function
7450 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7451 * [Most types implement `fmt::Debug`][1.9db].
7452 * [The default buffer size used by `BufReader` and `BufWriter` was
7453 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7454 used by other languages.
7455 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7456 `Duration` additionally implements `*=` and `/=`][1.9ta].
7457 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7458 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7459 * [`Chain` implements `BufRead`][1.9ch].
7460 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7465 * [Cargo can now run concurrently][1.9cc].
7466 * [Top-level overrides allow specific revisions of crates to be
7467 overridden through the entire crate graph][1.9ct]. This is intended
7468 to make upgrades easier for large projects, by allowing crates to be
7469 forked temporarily until they've been upgraded and republished.
7470 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7471 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7472 on the commandline][1.9cf]. `rustc` arguments can also be specified
7473 in the `build.rustflags` configuration key.
7478 * [The time complexity of comparing variables for equivalence during type
7479 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7480 to major compilation time improvement in some scenarios.
7481 * [`ToString` is specialized for `str`, giving it the same performance
7482 as `to_owned`][1.9ts].
7483 * [Spawning processes with `Command::output` no longer creates extra
7485 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7486 for C-like enums][1.9cl].
7491 * [Passing the `--quiet` flag to a test runner will produce
7492 much-abbreviated output][1.9q].
7493 * The Rust Project now publishes std binaries for the
7494 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7495 `i586-pc-windows-msvc` targets.
7500 * [`std::sync::Once` is poisoned if its initialization function
7502 * [It is illegal to define methods with the same name in overlapping
7503 inherent `impl` blocks][1.9sn].
7504 * [`fn` item types are zero sized, and each `fn` names a unique
7505 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7506 `transmute` on a `fn` type will generate a warning for a few cycles,
7507 then will be converted to an error.
7508 * [Improvements to const evaluation may trigger new errors when integer
7509 literals are out of range][1.9ce].
7512 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7513 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7514 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7515 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7516 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7517 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7518 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7519 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7520 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7521 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7522 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7523 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7524 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7525 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7526 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7527 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7528 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7529 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7530 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7531 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7532 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7533 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7534 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7535 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7536 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7537 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7538 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7539 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7540 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7541 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7542 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7543 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7544 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7545 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7546 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7547 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7548 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7549 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7550 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7551 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7552 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7553 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7554 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7555 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7556 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7557 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7558 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7559 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7560 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7561 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7562 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7563 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7564 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7565 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7566 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7567 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7568 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7569 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7570 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7571 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7572 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7573 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7574 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7575 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7576 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7577 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7578 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7579 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7580 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7581 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7582 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7583 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7584 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7585 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7586 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7587 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7588 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7589 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7590 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7591 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7592 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7593 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7594 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7595 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7596 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7597 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7598 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7599 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7600 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7601 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7602 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7603 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7604 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7605 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7606 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7607 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7608 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7609 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7610 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7611 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7612 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7613 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7614 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7615 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7616 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7617 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7618 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7619 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7620 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7621 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7624 Version 1.8.0 (2016-04-14)
7625 ==========================
7630 * Rust supports overloading of compound assignment statements like
7631 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7632 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7633 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7635 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7636 addition to the non-braced form, `struct Foo;`. [RFC 218].
7642 * [`str::encode_utf16`] (renamed from `utf16_units`)
7643 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7646 * [`ptr::drop_in_place`]
7648 * [`time::SystemTime`]
7650 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7651 * [`Instant::elapsed`]
7652 * [`SystemTime::now`]
7653 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7654 * [`SystemTime::elapsed`]
7655 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7656 * [`SystemTimeError`]
7657 * [`SystemTimeError::duration`]
7658 * Various impls for `SystemTimeError`
7660 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7661 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7662 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7663 * [The `write!` and `writeln!` macros correctly emit errors if any of
7664 their arguments can't be formatted][1.8w].
7665 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7666 * [The Unix-specific `raw` modules, which contain a number of
7667 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7668 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7669 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7670 across platforms was making it difficult to implement `std`
7671 correctly. Those that need these definitions should use the `libc`
7673 * The Unix-specific `MetadataExt` traits, including
7674 `os::unix::fs::MetadataExt`, which expose values such as inode
7675 numbers [no longer return platform-specific types][1.8r], but
7676 instead return widened integers. [RFC 1415].
7677 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7678 * [Atomic loads and stores are not volatile][1.8a].
7679 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7684 * [Inlining hash functions lead to a 3% compile-time improvement in
7685 some workloads][1.8h].
7686 * When using jemalloc, its symbols are [unprefixed so that it
7687 overrides the libc malloc implementation][1.8h]. This means that for
7688 rustc, LLVM is now using jemalloc, which results in a 6%
7689 compile-time improvement on a specific workload.
7690 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7695 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7696 i686-pc-windows-msvc is now considered a tier-1 platform.
7697 * [The `--print targets` flag prints a list of supported targets][1.8t].
7698 * [The `--print cfg` flag prints the `cfg`s defined for the current
7700 * [`rustc` can be built with an new Cargo-based build system, written
7701 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7702 build system. To enable it configure with `configure --rustbuild`.
7703 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7704 variants while also indicating the total number of missing variants
7705 if more than 3][1.8m].
7706 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7707 * The Rust Project now publishes binary releases of the standard
7708 library for a number of tier-2 targets:
7709 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7710 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7711 `x86_64-rumprun-netbsd`. These can be installed with
7712 tools such as [multirust][1.8mr].
7717 * [`cargo init` creates a new Cargo project in the current
7718 directory][1.8ci]. It is otherwise like `cargo new`.
7719 * [Cargo has configuration keys for `-v` and
7720 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7721 `[term]` section of `.cargo/config`.
7722 * [Configuration keys that evaluate to strings or integers can be set
7723 via environment variables][1.8ce]. For example the `build.jobs` key
7724 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7725 precedence over config files.
7726 * [Target-specific dependencies support Rust `cfg` syntax for
7727 describing targets][1.8cfg] so that dependencies for multiple
7728 targets can be specified together. [RFC 1361].
7729 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7730 `RUSTDOC` take precedence over the `build.target-dir`,
7731 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7732 * [The child process tree is killed on Windows when Cargo is
7734 * [The `build.target` configuration value sets the target platform,
7735 like `--target`][1.8ct].
7740 * [Unstable compiler flags have been further restricted][1.8u]. Since
7741 1.0 `-Z` flags have been considered unstable, and other flags that
7742 were considered unstable additionally required passing `-Z
7743 unstable-options` to access. Unlike unstable language and library
7744 features though, these options have been accessible on the stable
7745 release channel. Going forward, *new unstable flags will not be
7746 available on the stable release channel*, and old unstable flags
7747 will warn about their usage. In the future, all unstable flags will
7748 be unavailable on the stable release channel.
7749 * [It is no longer possible to `match` on empty enum variants using
7750 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7751 * The Unix-specific `MetadataExt` traits, including
7752 `os::unix::fs::MetadataExt`, which expose values such as inode
7753 numbers [no longer return platform-specific types][1.8r], but
7754 instead return widened integers. [RFC 1415].
7755 * [Modules sourced from the filesystem cannot appear within arbitrary
7756 blocks, but only within other modules][1.8mf].
7757 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7758 * On Unix, [stack overflow triggers a runtime abort instead of a
7760 * [`Command::spawn` and its equivalents return an error if any of
7761 its command-line arguments contain interior `NUL`s][1.8n].
7762 * [Tuple and unit enum variants from other crates are in the type
7764 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7765 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7766 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7767 instead of `foo.lib`.
7770 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7771 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7772 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7773 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7774 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7775 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7776 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7777 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7778 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7779 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7780 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7781 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7782 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7783 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7784 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7785 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7786 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7787 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7788 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7789 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7790 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7791 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7792 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7793 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7794 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7795 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7796 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7797 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7798 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7799 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7800 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7801 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7802 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7803 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7804 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7805 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7806 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7807 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7808 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7809 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7810 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7811 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7812 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7813 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7814 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7815 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7816 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7817 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7818 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7819 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7820 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7821 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7822 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7823 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7824 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7825 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7826 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7827 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7828 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7829 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7832 Version 1.7.0 (2016-03-03)
7833 ==========================
7840 * [`Path::strip_prefix`] (renamed from relative_from)
7841 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7843 * [`Ipv4Addr::is_loopback`]
7844 * [`Ipv4Addr::is_private`]
7845 * [`Ipv4Addr::is_link_local`]
7846 * [`Ipv4Addr::is_multicast`]
7847 * [`Ipv4Addr::is_broadcast`]
7848 * [`Ipv4Addr::is_documentation`]
7850 * [`Ipv6Addr::is_unspecified`]
7851 * [`Ipv6Addr::is_loopback`]
7852 * [`Ipv6Addr::is_multicast`]
7855 * [`Vec::as_mut_slice`]
7857 * [`String::as_str`]
7858 * [`String::as_mut_str`]
7860 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7862 * `<[T]>::`[`sort_by_key`]
7863 * checked, saturated, and overflowing operations
7864 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7865 * [`i32::saturating_mul`]
7866 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7867 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7868 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7869 * [`u32::saturating_mul`]
7870 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7871 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7872 * and checked, saturated, and overflowing operations for other primitive types
7874 * [`ffi::IntoStringError`]
7875 * [`CString::into_string`]
7876 * [`CString::into_bytes`]
7877 * [`CString::into_bytes_with_nul`]
7878 * `From<CString> for Vec<u8>`
7880 * [`IntoStringError::into_cstring`]
7881 * [`IntoStringError::utf8_error`]
7882 * `Error for IntoStringError`
7884 * [`std::hash::BuildHasher`]
7885 * [`BuildHasher::Hasher`]
7886 * [`BuildHasher::build_hasher`]
7887 * [`std::hash::BuildHasherDefault`]
7888 * [`HashMap::with_hasher`]
7889 * [`HashMap::with_capacity_and_hasher`]
7890 * [`HashSet::with_hasher`]
7891 * [`HashSet::with_capacity_and_hasher`]
7892 * [`std::collections::hash_map::RandomState`]
7893 * [`RandomState::new`]
7894 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7895 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7896 from bytes is faster.
7897 * [The performance of `LineWriter` (and thus `io::stdout`) was
7898 improved by using `memchr` to search for newlines][1.7m].
7899 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7900 `f64` variants were stabilized previously.
7901 * [`BTreeMap` was rewritten to use less memory and improve the performance
7902 of insertion and iteration, the latter by as much as 5x][1.7bm].
7903 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7904 covariant over their contained type][1.7bt].
7905 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7906 over their contained type][1.7ll].
7907 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7909 * [`Any` is implemented for unsized types][1.7a].
7910 * [`Hash` is implemented for `Duration`][1.7h].
7915 * [When running tests with `--test`, rustdoc will pass `--cfg`
7916 arguments to the compiler][1.7dt].
7917 * [The compiler is built with RPATH information by default][1.7rpa].
7918 This means that it will be possible to run `rustc` when installed in
7919 unusual configurations without configuring the dynamic linker search
7921 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7922 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7923 over `LD_LIBRARY_PATH`.
7928 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7929 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7930 * [The `rerun-if-changed` build script directive no longer causes the
7931 build script to incorrectly run twice in certain scenarios][1.7rr].
7936 * Soundness fixes to the interactions between associated types and
7937 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7938 code that violates the new rules. This is a significant change that
7939 is known to break existing code, so it has emitted warnings for the
7940 new error cases since 1.4 to give crate authors time to adapt. The
7941 details of what is changing are subtle; read the RFC for more.
7942 * [Several bugs in the compiler's visibility calculations were
7943 fixed][1.7v]. Since this was found to break significant amounts of
7944 code, the new errors will be emitted as warnings for several release
7945 cycles, under the `private_in_public` lint.
7946 * Defaulted type parameters were accidentally accepted in positions
7947 that were not intended. In this release, [defaulted type parameters
7948 appearing outside of type definitions will generate a
7949 warning][1.7d], which will become an error in future releases.
7950 * [Parsing "." as a float results in an error instead of 0][1.7p].
7951 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7952 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7954 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7955 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7956 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7957 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7958 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7959 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7960 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7961 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7962 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7963 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7964 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7965 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7966 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7967 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7968 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7969 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7970 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7971 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7972 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7973 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7974 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7975 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7976 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7977 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7978 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7979 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7980 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7981 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7982 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7983 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7984 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7985 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7986 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7987 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7988 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7989 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7990 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7991 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7992 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7993 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7994 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7995 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7996 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7997 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7998 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7999 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8000 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8001 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8002 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8003 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8004 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8005 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8006 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8007 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8008 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8009 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8010 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8011 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8012 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8013 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8014 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8015 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8016 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8017 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8018 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8019 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8020 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8021 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8022 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8023 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8024 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8025 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8026 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8027 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8028 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8029 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8030 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8031 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8032 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8035 Version 1.6.0 (2016-01-21)
8036 ==========================
8041 * The `#![no_std]` attribute causes a crate to not be linked to the
8042 standard library, but only the [core library][1.6co], as described
8043 in [RFC 1184]. The core library defines common types and traits but
8044 has no platform dependencies whatsoever, and is the basis for Rust
8045 software in environments that cannot support a full port of the
8046 standard library, such as operating systems. Most of the core
8047 library is now stable.
8053 [`Read::read_exact`],
8054 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8055 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8056 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8057 [`os::unix::fs::DirBuilderExt`],
8058 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8059 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8060 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8061 [`collections::hash_map::Drain`],
8062 [`collections::hash_map::HashMap::drain`],
8063 [`collections::hash_set::Drain`],
8064 [`collections::hash_set::HashSet::drain`],
8065 [`collections::binary_heap::Drain`],
8066 [`collections::binary_heap::BinaryHeap::drain`],
8067 [`Vec::extend_from_slice`] (renamed from `push_all`),
8068 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8069 [`RwLock::into_inner`],
8070 [`Iterator::min_by_key`] (renamed from `min_by`),
8071 [`Iterator::max_by_key`] (renamed from `max_by`).
8072 * The [core library][1.6co] is stable, as are most of its APIs.
8073 * [The `assert_eq!` macro supports arguments that don't implement
8074 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8076 * Several timer functions that take duration in milliseconds [are
8077 deprecated in favor of those that take `Duration`][1.6ms]. These
8078 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8079 `thread::park_timeout_ms`.
8080 * The algorithm by which `Vec` reserves additional elements was
8081 [tweaked to not allocate excessive space][1.6a] while still growing
8083 * `From` conversions are [implemented from integers to floats][1.6f]
8084 in cases where the conversion is lossless. Thus they are not
8085 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8086 or `f64`. They are also not implemented for `isize` and `usize`
8087 because the implementations would be platform-specific. `From` is
8088 also implemented from `f32` to `f64`.
8089 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8090 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8091 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8092 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8094 * Sorting slices that are already sorted [is 50% faster in some
8100 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8101 * Cargo build scripts can specify their dependencies by emitting the
8102 [`rerun-if-changed`][1.6rr] key.
8103 * crates.io will reject publication of crates with dependencies that
8104 have a wildcard version constraint. Crates with wildcard
8105 dependencies were seen to cause a variety of problems, as described
8106 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8108 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8109 release folder. A variety of artifacts that Cargo failed to clean
8110 are now correctly deleted.
8115 * The `unreachable_code` lint [warns when a function call's argument
8117 * The parser indicates [failures that may be caused by
8118 confusingly-similar Unicode characters][1.6uc]
8119 * Certain macro errors [are reported at definition time][1.6m], not
8125 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8126 environment variable when locating crates. This was a pre-cargo
8127 feature for integrating with the package manager that was
8128 accidentally never removed.
8129 * [A number of bugs were fixed in the privacy checker][1.6p] that
8130 could cause previously-accepted code to break.
8131 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8132 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8133 struct pattern syntax (`Foo(..)`) can no longer be used to match
8134 unit structs. This is a warning now, but will become an error in
8135 future releases. Patterns that share the same name as a const are
8137 * A bug was fixed that causes [rustc not to apply default type
8138 parameters][1.6xc] when resolving certain method implementations of
8139 traits defined in other crates.
8141 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8142 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8143 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8144 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8145 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8146 [1.6co]: http://doc.rust-lang.org/core/index.html
8147 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8148 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8149 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8150 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8151 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8152 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8153 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8154 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8155 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8156 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8157 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8158 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8159 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8160 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8161 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8162 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8163 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8164 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8165 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8166 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8167 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8168 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8169 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8170 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8171 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8172 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8173 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8174 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8175 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8176 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8177 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8178 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8179 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8180 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8181 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8182 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8183 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8184 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8185 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8186 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8187 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8190 Version 1.5.0 (2015-12-10)
8191 ==========================
8193 * ~700 changes, numerous bugfixes
8199 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8200 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8201 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8202 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8203 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8204 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8205 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8206 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8207 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8208 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8209 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8210 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8211 [`Path::read_link`], [`Path::symlink_metadata`],
8212 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8213 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8214 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8215 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8216 [`slice::split_first_mut`], [`slice::split_first`],
8217 [`slice::split_last_mut`], [`slice::split_last`],
8218 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8219 [`str::MatchIndices`], [`str::RMatchIndices`],
8220 [`str::match_indices`], [`str::rmatch_indices`],
8221 [`str::slice_mut_unchecked`], [`string::ParseError`].
8222 * Rust applications hosted on crates.io can be installed locally to
8223 `~/.cargo/bin` with the [`cargo install`] command. Among other
8224 things this makes it easier to augment Cargo with new subcommands:
8225 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8226 invoked as `cargo foo`.
8227 * Crates with wildcard (`*`) dependencies will [emit warnings when
8228 published][1.5w]. In 1.6 it will no longer be possible to publish
8229 crates with wildcard dependencies.
8234 * The rules determining when a particular lifetime must outlive
8235 a particular value (known as '[dropck]') have been [modified
8236 to not rely on parametricity][1.5p].
8237 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8238 and `Arc`][1.5a]. Because these smart pointer types implement
8239 `Deref`, this causes breakage in cases where the interior type
8240 contains methods of the same name.
8241 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8242 that they could drop their content. Soundness fix.
8243 * All method invocations are [properly checked][1.5wf1] for
8244 [well-formedness][1.5wf2]. Soundness fix.
8245 * Traits whose supertraits contain `Self` are [not object
8246 safe][1.5o]. Soundness fix.
8247 * Target specifications support a [`no_default_libraries`][1.5nd]
8248 setting that controls whether `-nodefaultlibs` is passed to the
8249 linker, and in turn the `is_like_windows` setting no longer affects
8250 the `-nodefaultlibs` flag.
8251 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8252 * The `#[inline]` and `#[repr]` attributes [can only appear
8253 in valid locations][1.5at].
8254 * Native libraries linked from the local crate are [passed to
8255 the linker before native libraries from upstream crates][1.5nl].
8256 * Two rarely-used attributes, `#[no_debug]` and
8257 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8258 * Negation of unsigned integers, which has been a warning for
8259 several releases, [is now behind a feature gate and will
8260 generate errors][1.5nu].
8261 * The parser accidentally accepted visibility modifiers on
8262 enum variants, a bug [which has been fixed][1.5ev].
8263 * [A bug was fixed that allowed `use` statements to import unstable
8269 * When evaluating expressions at compile-time that are not
8270 compile-time constants (const-evaluating expressions in non-const
8271 contexts), incorrect code such as overlong bitshifts and arithmetic
8272 overflow will [generate a warning instead of an error][1.5ce],
8273 delaying the error until runtime. This will allow the
8274 const-evaluator to be expanded in the future backwards-compatibly.
8275 * The `improper_ctypes` lint [no longer warns about using `isize` and
8276 `usize` in FFI][1.5ict].
8281 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8283 * `Default` is [implemented for mutable slices][1.5d].
8284 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8285 * There are now `From` conversions [between floating point
8286 types][1.5f] where the conversions are lossless.
8287 * There are now `From` conversions [between integer types][1.5i] where
8288 the conversions are lossless.
8289 * [`fs::Metadata` implements `Clone`][1.5fs].
8290 * The `parse` method [accepts a leading "+" when parsing
8292 * [`AsMut` is implemented for `Vec`][1.5am].
8293 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8294 been optimized][1.5cf] and no longer rely on the default impl.
8295 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8296 `unsafe extern "C"` function types now [implement `Clone`,
8297 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8298 `fmt::Debug` for up to 12 arguments][1.5fp].
8299 * [Dropping `Vec`s is much faster in unoptimized builds when the
8300 element types don't implement `Drop`][1.5dv].
8301 * A bug that caused in incorrect behavior when [combining `VecDeque`
8302 with zero-sized types][1.5vdz] was resolved.
8303 * [`PartialOrd` for slices is faster][1.5po].
8308 * [Crate metadata size was reduced by 20%][1.5md].
8309 * [Improvements to code generation reduced the size of libcore by 3.3
8310 MB and rustc's memory usage by 18MB][1.5m].
8311 * [Improvements to deref translation increased performance in
8312 unoptimized builds][1.5dr].
8313 * Various errors in trait resolution [are deduplicated to only be
8314 reported once][1.5te].
8315 * Rust has preliminary [support for rumprun kernels][1.5rr].
8316 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8318 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8319 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8320 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8321 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8322 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8323 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8324 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8325 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8326 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8327 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8328 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8329 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8330 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8331 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8332 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8333 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8334 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8335 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8336 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8337 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8338 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8339 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8340 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8341 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8342 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8343 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8344 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8345 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8346 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8347 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8348 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8349 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8350 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8351 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8352 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8353 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8354 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8355 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8356 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8357 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8358 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8359 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8360 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8361 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8362 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8363 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8364 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8365 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8366 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8367 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8368 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8369 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8370 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8371 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8372 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8373 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8374 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8375 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8376 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8377 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8378 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8379 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8380 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8381 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8382 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8383 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8384 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8385 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8386 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8387 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8388 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8389 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8390 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8391 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8392 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8393 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8394 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8395 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8396 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8397 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8398 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8399 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8400 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8401 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8402 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8403 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8404 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8405 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8406 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8408 Version 1.4.0 (2015-10-29)
8409 ==========================
8411 * ~1200 changes, numerous bugfixes
8416 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8417 GNU) are now supported and recommended for use.
8422 * [Several changes have been made to fix type soundness and improve
8423 the behavior of associated types][sound]. See [RFC 1214]. Although
8424 we have mostly introduced these changes as warnings this release, to
8425 become errors next release, there are still some scenarios that will
8426 see immediate breakage.
8427 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8428 line breaks in addition to `\n`][crlf].
8429 * [Loans of `'static` lifetime extend to the end of a function][stat].
8430 * [`str::parse` no longer introduces avoidable rounding error when
8431 parsing floating point numbers. Together with earlier changes to
8432 float formatting/output, "round trips" like f.to_string().parse()
8433 now preserve the value of f exactly. Additionally, leading plus
8434 signs are now accepted][fp3].
8440 * `use` statements that import multiple items [can now rename
8441 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8442 * [Binops work correctly on fat pointers][binfat].
8443 * `pub extern crate`, which does not behave as expected, [issues a
8444 warning][pec] until a better solution is found.
8449 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8450 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8451 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8452 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8453 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8454 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8455 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8456 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8457 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8458 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8459 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8460 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8461 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8462 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8463 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8464 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8465 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8466 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8468 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8469 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8470 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8471 `f64::from_str_radix`.
8472 * [Reverse-searching strings is faster with the 'two-way'
8474 * [`std::io::copy` allows `?Sized` arguments][cc].
8475 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8476 [override `count`, `nth` and `last` with an *O*(1)
8477 implementation][it].
8478 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8479 * [`IntoRawFd` has been added to the Unix-specific prelude,
8480 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8482 * [`Extend<String>` and `FromIterator<String` are both implemented for
8484 * [`IntoIterator` is implemented for references to `Option` and
8486 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8487 Copy`][ext] as part of [RFC 839]. This will cause type inference
8488 breakage in rare situations.
8489 * [`BinaryHeap` implements `Debug`][bh2].
8490 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8492 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8493 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8494 * [String comparison is faster][faststr].
8495 * `&mut T` where `T: std::fmt::Write` [also implements
8496 `std::fmt::Write`][mutw].
8497 * [A stable regression in `VecDeque::push_back` and other
8498 capacity-altering methods that caused panics for zero-sized types
8500 * [Function pointers implement traits for up to 12 parameters][fp2].
8505 * The compiler [no longer uses the 'morestack' feature to prevent
8506 stack overflow][mm]. Instead it uses guard pages and stack
8507 probes (though stack probes are not yet implemented on any platform
8509 * [The compiler matches traits faster when projections are involved][p].
8510 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8512 * [Cargo now displays useful information about what its doing during
8513 `cargo update`][cu].
8515 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8516 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8517 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8518 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8519 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8520 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8521 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8522 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8523 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8524 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8525 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8526 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8527 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8528 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8529 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8530 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8531 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8532 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8533 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8534 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8535 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8536 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8537 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8538 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8539 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8540 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8541 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8542 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8543 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8544 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8545 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8546 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8547 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8548 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8549 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8550 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8551 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8552 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8553 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8554 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8555 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8556 [bh2]: https://github.com/rust-lang/rust/pull/28156
8557 [binfat]: https://github.com/rust-lang/rust/pull/28270
8558 [bm]: https://github.com/rust-lang/rust/pull/28197
8559 [cc]: https://github.com/rust-lang/rust/pull/27531
8560 [crlf]: https://github.com/rust-lang/rust/pull/28034
8561 [cu]: https://github.com/rust-lang/cargo/pull/1931
8562 [d]: https://github.com/rust-lang/rust/pull/27825
8563 [dep]: https://github.com/rust-lang/rust/pull/28339
8564 [es]: https://github.com/rust-lang/rust/pull/27956
8565 [ext]: https://github.com/rust-lang/rust/pull/28094
8566 [faststr]: https://github.com/rust-lang/rust/pull/28338
8567 [ffi]: https://github.com/rust-lang/rust/pull/28779
8568 [fp]: https://github.com/rust-lang/rust/pull/28268
8569 [fp2]: https://github.com/rust-lang/rust/pull/28560
8570 [fp3]: https://github.com/rust-lang/rust/pull/27307
8571 [i]: https://github.com/rust-lang/rust/pull/27451
8572 [into2]: https://github.com/rust-lang/rust/pull/28039
8573 [it]: https://github.com/rust-lang/rust/pull/27652
8574 [mm]: https://github.com/rust-lang/rust/pull/27338
8575 [mutw]: https://github.com/rust-lang/rust/pull/28368
8576 [sound]: https://github.com/rust-lang/rust/pull/27641
8577 [p]: https://github.com/rust-lang/rust/pull/27866
8578 [pec]: https://github.com/rust-lang/rust/pull/28486
8579 [pr]: https://github.com/rust-lang/rust/pull/27896
8580 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8581 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8582 [s]: https://github.com/rust-lang/rust/pull/27474
8583 [stab]: https://github.com/rust-lang/rust/pull/28339
8584 [stat]: https://github.com/rust-lang/rust/pull/28321
8585 [vd]: https://github.com/rust-lang/rust/pull/28494
8587 Version 1.3.0 (2015-09-17)
8588 ==============================
8590 * ~900 changes, numerous bugfixes
8595 * The [new object lifetime defaults][nold] have been [turned
8596 on][nold2] after a cycle of warnings about the change. Now types
8597 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8598 being interpreted as `&'a Box<Trait+'a>` to `&'a
8599 Box<Trait+'static>`.
8600 * [The Rustonomicon][nom] is a new book in the official documentation
8601 that dives into writing unsafe Rust.
8602 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8603 timekeeping is employed by other std APIs, as well as out-of-tree
8609 * The [new object lifetime defaults][nold] have been [turned
8610 on][nold2] after a cycle of warnings about the change.
8611 * There is a known [regression][lr] in how object lifetime elision is
8612 interpreted, the proper solution for which is undetermined.
8613 * The `#[prelude_import]` attribute, an internal implementation
8614 detail, was accidentally stabilized previously. [It has been put
8615 behind the `prelude_import` feature gate][pi]. This change is
8616 believed to break no existing code.
8617 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8618 [more sane for dynamically sized types][dst3]. Code that relied on
8619 the previous behavior is thought to be broken.
8620 * The `dropck` rules, which checks that destructors can't access
8621 destroyed values, [have been updated][dropck] to match the
8622 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8623 cause some previously-compiling code to no longer build.
8628 * The [new object lifetime defaults][nold] have been [turned
8629 on][nold2] after a cycle of warnings about the change.
8630 * Semicolons may [now follow types and paths in
8631 macros](https://github.com/rust-lang/rust/pull/27000).
8632 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8633 [more sane for dynamically sized types][dst3]. Code that relied on
8634 the previous behavior is not known to exist, and suspected to be
8636 * `'static` variables [may now be recursive][st].
8637 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8638 implementations correctly.
8639 * The `dropck` rules, which checks that destructors can't access
8640 destroyed values, [have been updated][dropck] to match the
8646 * The [`Duration`] API, [has been stabilized][ds], as well as the
8647 `std::time` module, which presently contains only `Duration`.
8648 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8649 * The owned C string, [`CString`], implements [`Borrow`] and the
8650 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8651 these allow C strings to be borrowed and cloned in generic code.
8652 * [`CStr`] implements [`Debug`].
8653 * [`AtomicPtr`] implements [`Debug`].
8654 * [`Error`] trait objects [can be downcast to their concrete types][e]
8655 in many common configurations, using the [`is`], [`downcast`],
8656 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8658 * Searching for substrings now [employs the two-way algorithm][search]
8659 instead of doing a naive search. This gives major speedups to a
8660 number of methods, including [`contains`][sc], [`find`][sf],
8661 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8662 [`ends_with`][sew] are also faster.
8663 * The performance of `PartialEq` for slices is [much faster][ps].
8664 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8665 is overridden and optimized by the implementations for scalars.
8666 * The [`Hasher`] trait now has a number of specialized `write_*`
8667 methods for primitive types, for efficiency.
8668 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8669 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8670 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8671 of [`std::error::Error::cause`][iec] also delegates to the inner
8673 * [`process::Child`][pc] gained the [`id`] method, which returns a
8674 `u32` representing the platform-specific process identifier.
8675 * The [`connect`] method on slices is deprecated, replaced by the new
8676 [`join`] method (note that both of these are on the *unstable*
8677 [`SliceConcatExt`] trait, but through the magic of the prelude are
8678 available to stable code anyway).
8679 * The [`Div`] operator is implemented for [`Wrapping`] types.
8680 * [`DerefMut` is implemented for `String`][dms].
8681 * Performance of SipHash (the default hasher for `HashMap`) is
8682 [better for long data][sh].
8683 * [`AtomicPtr`] implements [`Send`].
8684 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8685 are now [specialized to use uninitialized buffers for increased
8687 * Lifetime parameters of foreign functions [are now resolved
8693 * Rust can now, with some coercion, [produce programs that run on
8694 Windows XP][xp], though XP is not considered a supported platform.
8695 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8696 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8697 recommended for use in 1.3, though should be fully-functional
8698 in the [64-bit 1.4 beta][b14].
8699 * On Fedora-based systems installation will [properly configure the
8700 dynamic linker][fl].
8701 * The compiler gained many new extended error descriptions, which can
8702 be accessed with the `--explain` flag.
8703 * The `dropck` pass, which checks that destructors can't access
8704 destroyed values, [has been rewritten][dropck]. This fixes some
8705 soundness holes, and as such will cause some previously-compiling
8706 code to no longer build.
8707 * `rustc` now uses [LLVM to write archive files where possible][ar].
8708 Eventually this will eliminate the compiler's dependency on the ar
8710 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8711 supported FreeBSD on x86_64).
8712 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8713 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8715 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8716 will kill the process instead of leaking][nlp].
8718 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8719 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8720 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8721 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8722 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8723 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8724 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8725 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8726 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8727 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8728 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8729 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8730 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8731 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8732 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8733 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8734 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8735 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8736 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8737 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8738 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8739 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8740 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8741 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8742 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8743 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8744 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8745 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8746 [ar]: https://github.com/rust-lang/rust/pull/26926
8747 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8748 [dms]: https://github.com/rust-lang/rust/pull/26241
8749 [dropck]: https://github.com/rust-lang/rust/pull/27261
8750 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8751 [ds]: https://github.com/rust-lang/rust/pull/26818
8752 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8753 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8754 [dst3]: https://github.com/rust-lang/rust/pull/27351
8755 [e]: https://github.com/rust-lang/rust/pull/24793
8756 [f]: https://github.com/rust-lang/rust/pull/26588
8757 [fb]: https://github.com/rust-lang/rust/pull/26959
8758 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8759 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8760 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8761 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8762 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8763 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8764 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8765 [lic]: https://github.com/rust-lang/rust/pull/26583
8766 [lnu]: https://github.com/rust-lang/rust/pull/27026
8767 [lr]: https://github.com/rust-lang/rust/issues/27248
8768 [lum]: https://github.com/rust-lang/rust/pull/26378
8769 [lur]: https://github.com/rust-lang/rust/pull/26783
8770 [nlp]: https://github.com/rust-lang/rust/pull/27176
8771 [nold2]: https://github.com/rust-lang/rust/pull/27045
8772 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8773 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8774 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8775 [pi]: https://github.com/rust-lang/rust/pull/26699
8776 [ps]: https://github.com/rust-lang/rust/pull/26884
8777 [rte]: https://github.com/rust-lang/rust/pull/26950
8778 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8779 [search]: https://github.com/rust-lang/rust/pull/26327
8780 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8781 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8782 [sh]: https://github.com/rust-lang/rust/pull/27280
8783 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8784 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8785 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8786 [st]: https://github.com/rust-lang/rust/pull/26630
8787 [win1]: https://github.com/rust-lang/rust/pull/26569
8788 [win2]: https://github.com/rust-lang/rust/pull/26741
8789 [win3]: https://github.com/rust-lang/rust/pull/26741
8790 [win4]: https://github.com/rust-lang/rust/pull/27210
8791 [xp]: https://github.com/rust-lang/rust/pull/26569
8793 Version 1.2.0 (2015-08-07)
8794 ==========================
8796 * ~1200 changes, numerous bugfixes
8801 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8802 like `Rc` to contain types without a fixed size, arrays and trait
8803 objects, finally enabling use of `Rc<[T]>` and completing the
8804 implementation of DST.
8805 * [Parallel codegen][parcodegen] is now working again, which can
8806 substantially speed up large builds in debug mode; It also gets
8807 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8808 jobs). It's not enabled by default, but will be "in the near
8809 future". It can be activated with the `-C codegen-units=N` flag to
8811 * This is the first release with [experimental support for linking
8812 with the MSVC linker and lib C on Windows (instead of using the GNU
8813 variants via MinGW)][win]. It is yet recommended only for the most
8814 intrepid Rustaceans.
8815 * Benchmark compilations are showing a 30% improvement in
8816 bootstrapping over 1.1.
8821 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8822 unicode case mapping, which is a previously-planned change in
8823 behavior and considered a bugfix.
8824 * [`mem::align_of`] now specifies [the *minimum alignment* for
8825 T][align], which is usually the alignment programs are interested
8826 in, and the same value reported by clang's
8827 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8829 * [The `#[packed]` attribute is no longer silently accepted by the
8830 compiler][packed]. This attribute did nothing and code that
8831 mentioned it likely did not work as intended.
8832 * Associated type defaults are [now behind the
8833 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8834 defaults *did not work*, but could be mentioned syntactically. As
8835 such this breakage has minimal impact.
8840 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8841 matching against dereferenceable values.
8846 * The [`Extend`] trait, which grows a collection from an iterator, is
8847 implemented over iterators of references, for `String`, `Vec`,
8848 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8849 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8850 * The [`iter::once`] function returns an iterator that yields a single
8851 element, and [`iter::empty`] returns an iterator that yields no
8853 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8854 over substring matches.
8855 * [`Cell`] and [`RefCell`] both implement `Eq`.
8856 * A number of methods for wrapping arithmetic are added to the
8857 integral types, [`wrapping_div`], [`wrapping_rem`],
8858 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8859 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8860 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8861 type.. It is illegal for the default arithmetic operations in Rust
8862 to overflow; the desire to wrap must be explicit.
8863 * The `{:#?}` formatting specifier [displays the alternate,
8864 pretty-printed][debugfmt] form of the `Debug` formatter. This
8865 feature was actually introduced prior to 1.0 with little
8867 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8868 for writing data to formatted strings, similar to [`io::Write`].
8869 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8870 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8871 are used by code generators to emit implementations of [`Debug`].
8872 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8873 methods that convert case, following Unicode case mapping.
8874 * It is now easier to handle poisoned locks. The [`PoisonError`]
8875 type, returned by failing lock operations, exposes `into_inner`,
8876 `get_ref`, and `get_mut`, which all give access to the inner lock
8877 guard, and allow the poisoned lock to continue to operate. The
8878 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8879 poisoned lock without attempting to take the lock.
8880 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8881 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8882 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8883 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8885 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8891 * `rustc` employs smarter heuristics for guessing at [typos].
8892 * `rustc` emits more efficient code for [no-op conversions between
8893 unsafe pointers][nop].
8894 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8895 resulting in faster compile times and smaller code.
8897 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8898 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8899 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8900 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8901 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8902 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8903 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8904 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8905 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8906 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8907 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8908 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8909 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8910 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8911 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8912 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8913 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8914 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8915 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8916 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8917 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8918 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8919 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8920 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8921 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8922 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8923 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8924 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8925 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8926 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8927 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8928 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8929 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8930 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8931 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8932 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8933 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8934 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8935 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8936 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8937 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8938 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8939 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8940 [align]: https://github.com/rust-lang/rust/pull/25646
8941 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8942 [typos]: https://github.com/rust-lang/rust/pull/26087
8943 [nop]: https://github.com/rust-lang/rust/pull/26336
8944 [fat]: https://github.com/rust-lang/rust/pull/26411
8945 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8946 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8947 [packed]: https://github.com/rust-lang/rust/pull/25541
8948 [ad]: https://github.com/rust-lang/rust/pull/27382
8949 [win]: https://github.com/rust-lang/rust/pull/25350
8951 Version 1.1.0 (2015-06-25)
8952 =========================
8954 * ~850 changes, numerous bugfixes
8959 * The [`std::fs` module has been expanded][fs] to expand the set of
8960 functionality exposed:
8961 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8962 don't incur a syscall on some platforms.
8963 * A `symlink_metadata` function has been added.
8964 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8965 access to all underlying information.
8966 * The compiler now contains extended explanations of many errors. When an error
8967 with an explanation occurs the compiler suggests using the `--explain` flag
8968 to read the explanation. Error explanations are also [available online][err-index].
8969 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8970 well as other work, the time to bootstrap the compiler decreased by
8976 * The [`str::split_whitespace`] method splits a string on unicode
8977 whitespace boundaries.
8978 * On both Windows and Unix, new extension traits provide conversion of
8979 I/O types to and from the underlying system handles. On Unix, these
8980 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8981 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8982 `TcpListener`, and `UpdSocket`. Further implementations for
8983 `std::process` will be stabilized later.
8984 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8985 Windows, symlinks can be created with
8986 `std::os::windows::symlink_dir` and
8987 `std::os::windows::symlink_file`.
8988 * The `mpsc::Receiver` type can now be converted into an iterator with
8989 `into_iter` on the [`IntoIterator`] trait.
8990 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8991 implementation of the [`From`] trait.
8992 * The `Debug` implementation for `RangeFull` [creates output that is
8993 more consistent with other implementations][rf].
8994 * [`Debug` is implemented for `File`][file].
8995 * The `Default` implementation for `Arc` [no longer requires `Sync +
8997 * [The `Iterator` methods `count`, `nth`, and `last` have been
8998 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
8999 * Incorrect handling of paths on Windows has been improved in both the
9000 compiler and the standard library.
9001 * [`AtomicPtr` gained a `Default` implementation][ap].
9002 * In accordance with Rust's policy on arithmetic overflow `abs` now
9003 [panics on overflow when debug assertions are enabled][abs].
9004 * The [`Cloned`] iterator, which was accidentally left unstable for
9005 1.0 [has been stabilized][c].
9006 * The [`Incoming`] iterator, which iterates over incoming TCP
9007 connections, and which was accidentally unnamable in 1.0, [is now
9008 properly exported][inc].
9009 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9010 `sift_up` or `sift_down` panic][bh].
9011 * The [`split_off`] method of `LinkedList` [no longer corrupts
9012 the list in certain scenarios][ll].
9017 * Type checking performance [has improved notably][sk] with
9018 [multiple improvements][pre].
9019 * The compiler [suggests code changes][ch] for more errors.
9020 * rustc and it's build system have experimental support for [building
9021 toolchains against MUSL][m] instead of glibc on Linux.
9022 * The compiler defines the `target_env` cfg value, which is used for
9023 distinguishing toolchains that are otherwise for the same
9024 platform. Presently this is set to `gnu` for common GNU Linux
9025 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9026 * The [`cargo rustc`][crc] command invokes a build with custom flags
9028 * [Android executables are always position independent][pie].
9029 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9032 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9033 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9034 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9035 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9036 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9037 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9038 [rf]: https://github.com/rust-lang/rust/pull/24491
9039 [err-index]: https://doc.rust-lang.org/error-index.html
9040 [sk]: https://github.com/rust-lang/rust/pull/24615
9041 [pre]: https://github.com/rust-lang/rust/pull/25323
9042 [file]: https://github.com/rust-lang/rust/pull/24598
9043 [ch]: https://github.com/rust-lang/rust/pull/24683
9044 [arc]: https://github.com/rust-lang/rust/pull/24695
9045 [si]: https://github.com/rust-lang/rust/pull/24701
9046 [ap]: https://github.com/rust-lang/rust/pull/24834
9047 [m]: https://github.com/rust-lang/rust/pull/24777
9048 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9049 [crc]: https://github.com/rust-lang/cargo/pull/1568
9050 [pie]: https://github.com/rust-lang/rust/pull/24953
9051 [abs]: https://github.com/rust-lang/rust/pull/25441
9052 [c]: https://github.com/rust-lang/rust/pull/25496
9053 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9054 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9055 [inc]: https://github.com/rust-lang/rust/pull/25522
9056 [bh]: https://github.com/rust-lang/rust/pull/25856
9057 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9058 [ll]: https://github.com/rust-lang/rust/pull/26022
9059 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9060 [drop]: https://github.com/rust-lang/rust/pull/24935
9062 Version 1.0.0 (2015-05-15)
9063 ========================
9065 * ~1500 changes, numerous bugfixes
9070 * The vast majority of the standard library is now `#[stable]`. It is
9071 no longer possible to use unstable features with a stable build of
9073 * Many popular crates on [crates.io] now work on the stable release
9075 * Arithmetic on basic integer types now [checks for overflow in debug
9081 * Several [restrictions have been added to trait coherence][coh] in
9082 order to make it easier for upstream authors to change traits
9083 without breaking downstream code.
9084 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9085 improve error messages and macro behavior. For example, `0b1234` is
9086 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9087 * Trait bounds [are always invariant][inv], eliminating the need for
9088 the `PhantomFn` and `MarkerTrait` lang items, which have been
9090 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9091 "foo" as bar` syntax has been replaced with `extern crate foo as
9092 bar`, and Cargo now automatically translates "-" in *package* names
9093 to underscore for the crate name.
9094 * [Lifetime shadowing is an error][lt].
9095 * [`Send` no longer implies `'static`][send-rfc].
9096 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9097 `MyType::default()`.
9098 * Primitive types [now have inherent methods][prim-inherent],
9099 obviating the need for extension traits like `SliceExt`.
9100 * Methods with `Self: Sized` in their `where` clause are [considered
9101 object-safe][self-sized], allowing many extension traits like
9102 `IteratorExt` to be merged into the traits they extended.
9103 * You can now [refer to associated types][assoc-where] whose
9104 corresponding trait bounds appear only in a `where` clause.
9105 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9106 like `Send` and `Sync` are now library-defined.
9107 * A [Reflect trait][reflect] was introduced, which means that
9108 downcasting via the `Any` trait is effectively limited to concrete
9109 types. This helps retain the potentially-important "parametricity"
9110 property: generic code cannot behave differently for different type
9111 arguments except in minor ways.
9112 * The `unsafe_destructor` feature is now deprecated in favor of the
9113 [new `dropck`][dropck]. This change is a major reduction in unsafe
9119 * The `thread_local` module [has been renamed to `std::thread`][th].
9120 * The methods of `IteratorExt` [have been moved to the `Iterator`
9122 * Several traits that implement Rust's conventions for type
9123 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9124 [centralized in the `std::convert` module][con].
9125 * The `FromError` trait [was removed in favor of `From`][fe].
9126 * The basic sleep function [has moved to
9127 `std::thread::sleep_ms`][slp].
9128 * The `splitn` function now takes an `n` parameter that represents the
9129 number of items yielded by the returned iterator [instead of the
9130 number of 'splits'][spl].
9131 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9132 * [Derived implementations of `PartialOrd` now order enums according
9133 to their explicitly-assigned discriminants][po].
9134 * [Methods for searching strings are generic over `Pattern`s][pat],
9135 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9137 * [In method resolution, object methods are resolved before inherent
9139 * [`String::from_str` has been deprecated in favor of the `From` impl,
9140 `String::from`][sf].
9141 * [`io::Error` implements `Sync`][ios].
9142 * [The `words` method on `&str` has been replaced with
9143 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9145 * The new path and IO modules are complete and `#[stable]`. This
9146 was the major library focus for this cycle.
9147 * The path API was [revised][path-normalize] to normalize `.`,
9148 adjusting the tradeoffs in favor of the most common usage.
9149 * A large number of remaining APIs in `std` were also stabilized
9150 during this cycle; about 75% of the non-deprecated API surface
9152 * The new [string pattern API][string-pattern] landed, which makes
9153 the string slice API much more internally consistent and flexible.
9154 * A new set of [generic conversion traits][conversion] replaced
9155 many existing ad hoc traits.
9156 * Generic numeric traits were [completely removed][num-traits]. This
9157 was made possible thanks to inherent methods for primitive types,
9158 and the removal gives maximal flexibility for designing a numeric
9159 hierarchy in the future.
9160 * The `Fn` traits are now related via [inheritance][fn-inherit]
9161 and provide ergonomic [blanket implementations][fn-blanket].
9162 * The `Index` and `IndexMut` traits were changed to
9163 [take the index by value][index-value], enabling code like
9164 `hash_map["string"]` to work.
9165 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9166 `Copy` data is known to be `Clone` as well.
9171 * Many errors now have extended explanations that can be accessed with
9172 the `--explain` flag to `rustc`.
9173 * Many new examples have been added to the standard library
9175 * rustdoc has received a number of improvements focused on completion
9177 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9178 * Much headway was made on ecosystem-wide CI, making it possible
9179 to [compare builds for breakage][ci-compare].
9182 [crates.io]: http://crates.io
9183 [clo]: https://github.com/rust-lang/rust/pull/24034
9184 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9185 [con]: https://github.com/rust-lang/rust/pull/23875
9186 [cr]: https://github.com/rust-lang/rust/pull/23419
9187 [fe]: https://github.com/rust-lang/rust/pull/23879
9188 [ie]: https://github.com/rust-lang/rust/pull/23300
9189 [inv]: https://github.com/rust-lang/rust/pull/23938
9190 [ios]: https://github.com/rust-lang/rust/pull/24133
9191 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9192 [lt]: https://github.com/rust-lang/rust/pull/24057
9193 [meth]: https://github.com/rust-lang/rust/pull/24056
9194 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9195 [po]: https://github.com/rust-lang/rust/pull/24270
9196 [sf]: https://github.com/rust-lang/rust/pull/24517
9197 [slp]: https://github.com/rust-lang/rust/pull/23949
9198 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9199 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9200 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9201 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9202 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9203 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9204 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9205 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9206 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9207 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9208 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9209 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9210 [reflect]: https://github.com/rust-lang/rust/pull/23712
9211 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9212 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9213 [index-value]: https://github.com/rust-lang/rust/pull/23601
9214 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9215 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9216 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9217 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9218 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9219 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9222 Version 1.0.0-alpha.2 (2015-02-20)
9223 =====================================
9225 * ~1300 changes, numerous bugfixes
9229 * The various I/O modules were [overhauled][io-rfc] to reduce
9230 unnecessary abstractions and provide better interoperation with
9231 the underlying platform. The old `io` module remains temporarily
9233 * The standard library now [participates in feature gating][feat],
9234 so use of unstable libraries now requires a `#![feature(...)]`
9235 attribute. The impact of this change is [described on the
9236 forum][feat-forum]. [RFC][feat-rfc].
9240 * `for` loops [now operate on the `IntoIterator` trait][into],
9241 which eliminates the need to call `.iter()`, etc. to iterate
9242 over collections. There are some new subtleties to remember
9243 though regarding what sort of iterators various types yield, in
9244 particular that `for foo in bar { }` yields values from a move
9245 iterator, destroying the original collection. [RFC][into-rfc].
9246 * Objects now have [default lifetime bounds][obj], so you don't
9247 have to write `Box<Trait+'static>` when you don't care about
9248 storing references. [RFC][obj-rfc].
9249 * In types that implement `Drop`, [lifetimes must outlive the
9250 value][drop]. This will soon make it possible to safely
9251 implement `Drop` for types where `#[unsafe_destructor]` is now
9252 required. Read the [gorgeous RFC][drop-rfc] for details.
9253 * The fully qualified <T as Trait>::X syntax lets you set the Self
9254 type for a trait method or associated type. [RFC][ufcs-rfc].
9255 * References to types that implement `Deref<U>` now [automatically
9256 coerce to references][deref] to the dereferenced type `U`,
9257 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9258 should eliminate many unsightly uses of `&*`, as when converting
9259 from references to vectors into references to
9260 slices. [RFC][deref-rfc].
9261 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9262 `|:|`) is obsolete and closure kind is inferred from context.
9263 * [`Self` is a keyword][Self].
9267 * The `Show` and `String` formatting traits [have been
9268 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9269 their related purposes. Automatically getting a string
9270 conversion to use with `format!("{:?}", something_to_debug)` is
9271 now written `#[derive(Debug)]`.
9272 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9273 OsStr}`, provide strings in platform-specific encodings for easier
9274 interop with system APIs. [RFC][osstr-rfc].
9275 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9276 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9277 creating raw pointers.
9281 * Certain long error messages of the form 'expected foo found bar'
9282 are now [split neatly across multiple
9283 lines][multiline]. Examples in the PR.
9284 * On Unix Rust can be [uninstalled][un] by running
9285 `/usr/local/lib/rustlib/uninstall.sh`.
9286 * The `#[rustc_on_unimplemented]` attribute, requiring the
9287 'on_unimplemented' feature, lets rustc [display custom error
9288 messages when a trait is expected to be implemented for a type
9293 * Rust is tested against a [LALR grammar][lalr], which parses
9294 almost all the Rust files that rustc does.
9296 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9297 [close]: https://github.com/rust-lang/rust/pull/21843
9298 [deref]: https://github.com/rust-lang/rust/pull/21351
9299 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9300 [drop]: https://github.com/rust-lang/rust/pull/21972
9301 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9302 [feat]: https://github.com/rust-lang/rust/pull/21248
9303 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9304 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9305 [fmt]: https://github.com/rust-lang/rust/pull/21457
9306 [into]: https://github.com/rust-lang/rust/pull/20790
9307 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9308 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9309 [lalr]: https://github.com/rust-lang/rust/pull/21452
9310 [multiline]: https://github.com/rust-lang/rust/pull/19870
9311 [obj]: https://github.com/rust-lang/rust/pull/22230
9312 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9313 [onun]: https://github.com/rust-lang/rust/pull/20889
9314 [osstr]: https://github.com/rust-lang/rust/pull/21488
9315 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9316 [Self]: https://github.com/rust-lang/rust/pull/22158
9317 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9318 [un]: https://github.com/rust-lang/rust/pull/22256
9321 Version 1.0.0-alpha (2015-01-09)
9322 ==================================
9324 * ~2400 changes, numerous bugfixes
9328 * The language itself is considered feature complete for 1.0,
9329 though there will be many usability improvements and bugfixes
9330 before the final release.
9331 * Nearly 50% of the public API surface of the standard library has
9332 been declared 'stable'. Those interfaces are unlikely to change
9334 * The long-running debate over integer types has been
9335 [settled][ints]: Rust will ship with types named `isize` and
9336 `usize`, rather than `int` and `uint`, for pointer-sized
9337 integers. Guidelines will be rolled out during the alpha cycle.
9338 * Most crates that are not `std` have been moved out of the Rust
9339 distribution into the Cargo ecosystem so they can evolve
9340 separately and don't need to be stabilized as quickly, including
9341 'time', 'getopts', 'num', 'regex', and 'term'.
9342 * Documentation continues to be expanded with more API coverage, more
9343 examples, and more in-depth explanations. The guides have been
9344 consolidated into [The Rust Programming Language][trpl].
9345 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9346 * All official Rust binary installers now come with [Cargo], the
9347 Rust package manager.
9351 * Closures have been [completely redesigned][unboxed] to be
9352 implemented in terms of traits, can now be used as generic type
9353 bounds and thus monomorphized and inlined, or via an opaque
9354 pointer (boxed) as in the old system. The new system is often
9355 referred to as 'unboxed' closures.
9356 * Traits now support [associated types][assoc], allowing families
9357 of related types to be defined together and used generically in
9359 * Enum variants are [namespaced by their type names][enum].
9360 * [`where` clauses][where] provide a more versatile and attractive
9361 syntax for specifying generic bounds, though the previous syntax
9363 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9365 * Rust [no longer has a runtime][rt] of any description, and only
9366 supports OS threads, not green threads.
9367 * At long last, Rust has been overhauled for 'dynamically-sized
9368 types' ([DST]), which integrates 'fat pointers' (object types,
9369 arrays, and `str`) more deeply into the type system, making it
9371 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9372 `..j` that produce range types and which, when combined with the
9373 `Index` operator and multidispatch, leads to a convenient slice
9375 * The new range syntax revealed an ambiguity in the fixed-length
9376 array syntax, so now fixed length arrays [are written `[T;
9378 * The `Copy` trait is no longer implemented automatically. Unsafe
9379 pointers no longer implement `Sync` and `Send` so types
9380 containing them don't automatically either. `Sync` and `Send`
9381 are now 'unsafe traits' so one can "forcibly" implement them via
9382 `unsafe impl` if a type confirms to the requirements for them
9383 even though the internals do not (e.g. structs containing unsafe
9384 pointers like `Arc`). These changes are intended to prevent some
9385 footguns and are collectively known as [opt-in built-in
9386 traits][oibit] (though `Sync` and `Send` will soon become pure
9387 library types unknown to the compiler).
9388 * Operator traits now take their operands [by value][ops], and
9389 comparison traits can use multidispatch to compare one type
9390 against multiple other types, allowing e.g. `String` to be
9391 compared with `&str`.
9392 * `if let` and `while let` are no longer feature-gated.
9393 * Rust has adopted a more [uniform syntax for escaping unicode
9394 characters][unicode].
9395 * `macro_rules!` [has been declared stable][mac]. Though it is a
9396 flawed system it is sufficiently popular that it must be usable
9397 for 1.0. Effort has gone into [future-proofing][mac-future] it
9398 in ways that will allow other macro systems to be developed in
9399 parallel, and won't otherwise impact the evolution of the
9401 * The prelude has been [pared back significantly][prelude] such
9402 that it is the minimum necessary to support the most pervasive
9403 code patterns, and through [generalized where clauses][where]
9404 many of the prelude extension traits have been consolidated.
9405 * Rust's rudimentary reflection [has been removed][refl], as it
9406 incurred too much code generation for little benefit.
9407 * [Struct variants][structvars] are no longer feature-gated.
9408 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9409 known as 'higher-ranked trait bounds', this crucially allows
9410 unboxed closures to work.
9411 * Macros invocations surrounded by parens or square brackets and
9412 not terminated by a semicolon are [parsed as
9413 expressions][macros], which makes expressions like `vec![1i32,
9414 2, 3].len()` work as expected.
9415 * Trait objects now implement their traits automatically, and
9416 traits that can be coerced to objects now must be [object
9418 * Automatically deriving traits is now done with `#[derive(...)]`
9419 not `#[deriving(...)]` for [consistency with other naming
9420 conventions][derive].
9421 * Importing the containing module or enum at the same time as
9422 items or variants they contain is [now done with `self` instead
9423 of `mod`][self], as in use `foo::{self, bar}`
9424 * Glob imports are no longer feature-gated.
9425 * The `box` operator and `box` patterns have been feature-gated
9426 pending a redesign. For now unique boxes should be allocated
9427 like other containers, with `Box::new`.
9431 * A [series][coll1] of [efforts][coll2] to establish
9432 [conventions][coll3] for collections types has resulted in API
9433 improvements throughout the standard library.
9434 * New [APIs for error handling][err] provide ergonomic interop
9435 between error types, and [new conventions][err-conv] describe
9436 more clearly the recommended error handling strategies in Rust.
9437 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9438 it is easier to discuss failure in the context of error handling
9439 without making clarifications as to whether you are referring to
9440 the 'fail' macro or failure more generally.
9441 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9442 syscall when available.
9443 * The 'serialize' crate has been renamed 'rustc-serialize' and
9444 moved out of the distribution to Cargo. Although it is widely
9445 used now, it is expected to be superseded in the near future.
9446 * The `Show` formatter, typically implemented with
9447 `#[derive(Show)]` is [now requested with the `{:?}`
9448 specifier][show] and is intended for use by all types, for uses
9449 such as `println!` debugging. The new `String` formatter must be
9450 implemented by hand, uses the `{}` specifier, and is intended
9451 for full-fidelity conversions of things that can logically be
9452 represented as strings.
9456 * [Flexible target specification][flex] allows rustc's code
9457 generation to be configured to support otherwise-unsupported
9459 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9460 respective debuggers with Rust-appropriate pretty-printing.
9461 * The Windows installation of Rust is distributed with the
9462 MinGW components currently required to link binaries on that
9467 * Nullable enum optimizations have been extended to more types so
9468 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9469 space than the inner types themselves.
9470 * Work has begun on supporting AArch64.
9472 [Cargo]: https://crates.io
9473 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9474 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9475 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9476 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9477 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9478 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9479 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9480 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9481 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9482 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9483 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9484 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9485 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9486 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9487 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9488 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9489 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9490 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9491 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9492 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9493 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9494 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9495 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9496 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9497 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9498 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9499 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9500 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9501 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9502 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9503 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9504 [trpl]: https://doc.rust-lang.org/book/index.html
9505 [rbe]: http://rustbyexample.com/
9508 Version 0.12.0 (2014-10-09)
9509 =============================
9511 * ~1900 changes, numerous bugfixes
9515 * The introductory documentation (now called The Rust Guide) has
9516 been completely rewritten, as have a number of supplementary
9518 * Rust's package manager, Cargo, continues to improve and is
9519 sometimes considered to be quite awesome.
9520 * Many API's in `std` have been reviewed and updated for
9521 consistency with the in-development Rust coding
9522 guidelines. The standard library documentation tracks
9523 stabilization progress.
9524 * Minor libraries have been moved out-of-tree to the rust-lang org
9525 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9526 be installed with Cargo.
9527 * Lifetime elision allows lifetime annotations to be left off of
9528 function declarations in many common scenarios.
9529 * Rust now works on 64-bit Windows.
9532 * Indexing can be overloaded with the `Index` and `IndexMut`
9534 * The `if let` construct takes a branch only if the `let` pattern
9535 matches, currently behind the 'if_let' feature gate.
9536 * 'where clauses', a more flexible syntax for specifying trait
9537 bounds that is more aesthetic, have been added for traits and
9538 free functions. Where clauses will in the future make it
9539 possible to constrain associated types, which would be
9540 impossible with the existing syntax.
9541 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9542 the 'slicing_syntax' feature gate, and can be overloaded with
9543 the `Slice` or `SliceMut` traits.
9544 * The syntax for matching of sub-slices has been changed to use a
9545 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9546 consistency with other uses of `..` and to future-proof
9547 potential additional uses of the syntax.
9548 * The syntax for matching inclusive ranges in patterns has changed
9549 from `0..3` to `0...4` to be consistent with the exclusive range
9551 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9552 c]`) has been put behind the 'advanced_slice_patterns' feature
9553 gate and may be removed in the future.
9554 * Components of tuples and tuple structs can be extracted using
9555 the `value.0` syntax, currently behind the `tuple_indexing`
9557 * The `#[crate_id]` attribute is no longer supported; versioning
9558 is handled by the package manager.
9559 * Renaming crate imports are now written `extern crate foo as bar`
9560 instead of `extern crate bar = foo`.
9561 * Renaming use statements are now written `use foo as bar` instead
9563 * `let` and `match` bindings and argument names in macros are now
9565 * The new, more efficient, closure types ('unboxed closures') have
9566 been added under a feature gate, 'unboxed_closures'. These will
9567 soon replace the existing closure types, once higher-ranked
9568 trait lifetimes are added to the language.
9569 * `move` has been added as a keyword, for indicating closures
9570 that capture by value.
9571 * Mutation and assignment is no longer allowed in pattern guards.
9572 * Generic structs and enums can now have trait bounds.
9573 * The `Share` trait is now called `Sync` to free up the term
9574 'shared' to refer to 'shared reference' (the default reference
9576 * Dynamically-sized types have been mostly implemented,
9577 unifying the behavior of fat-pointer types with the rest of the
9579 * As part of dynamically-sized types, the `Sized` trait has been
9580 introduced, which qualifying types implement by default, and
9581 which type parameters expect by default. To specify that a type
9582 parameter does not need to be sized, write `<Sized? T>`. Most
9583 types are `Sized`, notable exceptions being unsized arrays
9584 (`[T]`) and trait types.
9585 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9586 * Lifetime bounds can now be applied to type parameters and object
9588 * The old, reference counted GC type, `Gc<T>` which was once
9589 denoted by the `@` sigil, has finally been removed. GC will be
9590 revisited in the future.
9593 * Library documentation has been improved for a number of modules.
9594 * Bit-vectors, collections::bitv has been modernized.
9595 * The url crate is deprecated in favor of
9596 http://github.com/servo/rust-url, which can be installed with
9598 * Most I/O stream types can be cloned and subsequently closed from
9600 * A `std::time::Duration` type has been added for use in I/O
9601 methods that rely on timers, as well as in the 'time' crate's
9602 `Timespec` arithmetic.
9603 * The runtime I/O abstraction layer that enabled the green thread
9604 scheduler to do non-thread-blocking I/O has been removed, along
9605 with the libuv-based implementation employed by the green thread
9606 scheduler. This will greatly simplify the future I/O work.
9607 * `collections::btree` has been rewritten to have a more
9608 idiomatic and efficient design.
9611 * rustdoc output now indicates the stability levels of API's.
9612 * The `--crate-name` flag can specify the name of the crate
9613 being compiled, like `#[crate_name]`.
9614 * The `-C metadata` specifies additional metadata to hash into
9615 symbol names, and `-C extra-filename` specifies additional
9616 information to put into the output filename, for use by the
9617 package manager for versioning.
9618 * debug info generation has continued to improve and should be
9619 more reliable under both gdb and lldb.
9620 * rustc has experimental support for compiling in parallel
9621 using the `-C codegen-units` flag.
9622 * rustc no longer encodes rpath information into binaries by
9626 * Stack usage has been optimized with LLVM lifetime annotations.
9627 * Official Rust binaries on Linux are more compatible with older
9628 kernels and distributions, built on CentOS 5.10.
9631 Version 0.11.0 (2014-07-02)
9632 ==========================
9634 * ~1700 changes, numerous bugfixes
9637 * ~[T] has been removed from the language. This type is superseded by
9639 * ~str has been removed from the language. This type is superseded by
9641 * ~T has been removed from the language. This type is superseded by the
9643 * @T has been removed from the language. This type is superseded by the
9644 standard library's std::gc::Gc<T> type.
9645 * Struct fields are now all private by default.
9646 * Vector indices and shift amounts are both required to be a `uint`
9647 instead of any integral type.
9648 * Byte character, byte string, and raw byte string literals are now all
9649 supported by prefixing the normal literal with a `b`.
9650 * Multiple ABIs are no longer allowed in an ABI string
9651 * The syntax for lifetimes on closures/procedures has been tweaked
9652 slightly: `<'a>|A, B|: 'b + K -> T`
9653 * Floating point modulus has been removed from the language; however it
9654 is still provided by a library implementation.
9655 * Private enum variants are now disallowed.
9656 * The `priv` keyword has been removed from the language.
9657 * A closure can no longer be invoked through a &-pointer.
9658 * The `use foo, bar, baz;` syntax has been removed from the language.
9659 * The transmute intrinsic no longer works on type parameters.
9660 * Statics now allow blocks/items in their definition.
9661 * Trait bounds are separated from objects with + instead of : now.
9662 * Objects can no longer be read while they are mutably borrowed.
9663 * The address of a static is now marked as insignificant unless the
9664 #[inline(never)] attribute is placed it.
9665 * The #[unsafe_destructor] attribute is now behind a feature gate.
9666 * Struct literals are no longer allowed in ambiguous positions such as
9667 if, while, match, and for..in.
9668 * Declaration of lang items and intrinsics are now feature-gated by
9670 * Integral literals no longer default to `int`, and floating point
9671 literals no longer default to `f64`. Literals must be suffixed with an
9672 appropriate type if inference cannot determine the type of the
9674 * The Box<T> type is no longer implicitly borrowed to &mut T.
9675 * Procedures are now required to not capture borrowed references.
9678 * The standard library is now a "facade" over a number of underlying
9679 libraries. This means that development on the standard library should
9680 be speedier due to smaller crates, as well as a clearer line between
9682 * A new library, libcore, lives under the standard library's facade
9683 which is Rust's "0-assumption" library, suitable for embedded and
9684 kernel development for example.
9685 * A regex crate has been added to the standard distribution. This crate
9686 includes statically compiled regular expressions.
9687 * The unwrap/unwrap_err methods on Result require a Show bound for
9688 better error messages.
9689 * The return types of the std::comm primitives have been centralized
9690 around the Result type.
9691 * A number of I/O primitives have gained the ability to time out their
9693 * A number of I/O primitives have gained the ability to close their
9694 reading/writing halves to cancel pending operations.
9695 * Reverse iterator methods have been removed in favor of `rev()` on
9696 their forward-iteration counterparts.
9697 * A bitflags! macro has been added to enable easy interop with C and
9698 management of bit flags.
9699 * A debug_assert! macro is now provided which is disabled when
9700 `--cfg ndebug` is passed to the compiler.
9701 * A graphviz crate has been added for creating .dot files.
9702 * The std::cast module has been migrated into std::mem.
9703 * The std::local_data api has been migrated from freestanding functions
9704 to being based on methods.
9705 * The Pod trait has been renamed to Copy.
9706 * jemalloc has been added as the default allocator for types.
9707 * The API for allocating memory has been changed to use proper alignment
9708 and sized deallocation
9709 * Connecting a TcpStream or binding a TcpListener is now based on a
9710 string address and a u16 port. This allows connecting to a hostname as
9712 * The Reader trait now contains a core method, read_at_least(), which
9713 correctly handles many repeated 0-length reads.
9714 * The process-spawning API is now centered around a builder-style
9716 * The :? printing qualifier has been moved from the standard library to
9717 an external libdebug crate.
9718 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9719 have been renamed to Eq/Ord.
9720 * The select/plural methods have been removed from format!. The escapes
9721 for { and } have also changed from \{ and \} to {{ and }},
9723 * The TaskBuilder API has been re-worked to be a true builder, and
9724 extension traits for spawning native/green tasks have been added.
9727 * All breaking changes to the language or libraries now have their
9728 commit message annotated with `[breaking-change]` to allow for easy
9729 discovery of breaking changes.
9730 * The compiler will now try to suggest how to annotate lifetimes if a
9731 lifetime-related error occurs.
9732 * Debug info continues to be improved greatly with general bug fixes and
9733 better support for situations like link time optimization (LTO).
9734 * Usage of syntax extensions when cross-compiling has been fixed.
9735 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9736 -fdata-sections and --gc-sections has been enabled by default
9737 * The compiler is now stricter about where it will load module files
9738 from when a module is declared via `mod foo;`.
9739 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9740 Syntax extensions are now discovered via a "plugin registrar" type
9741 which will be extended in the future to other various plugins.
9742 * Lints have been restructured to allow for dynamically loadable lints.
9743 * A number of rustdoc improvements:
9744 * The HTML output has been visually redesigned.
9745 * Markdown is now powered by hoedown instead of sundown.
9746 * Searching heuristics have been greatly improved.
9747 * The search index has been reduced in size by a great amount.
9748 * Cross-crate documentation via `pub use` has been greatly improved.
9749 * Primitive types are now hyperlinked and documented.
9750 * Documentation has been moved from static.rust-lang.org/doc to
9752 * A new sandbox, play.rust-lang.org, is available for running and
9753 sharing rust code examples on-line.
9754 * Unused attributes are now more robustly warned about.
9755 * The dead_code lint now warns about unused struct fields.
9756 * Cross-compiling to iOS is now supported.
9757 * Cross-compiling to mipsel is now supported.
9758 * Stability attributes are now inherited by default and no longer apply
9759 to intra-crate usage, only inter-crate usage.
9760 * Error message related to non-exhaustive match expressions have been
9764 Version 0.10 (2014-04-03)
9765 =========================
9767 * ~1500 changes, numerous bugfixes
9770 * A new RFC process is now in place for modifying the language.
9771 * Patterns with `@`-pointers have been removed from the language.
9772 * Patterns with unique vectors (`~[T]`) have been removed from the
9774 * Patterns with unique strings (`~str`) have been removed from the
9776 * `@str` has been removed from the language.
9777 * `@[T]` has been removed from the language.
9778 * `@self` has been removed from the language.
9779 * `@Trait` has been removed from the language.
9780 * Headers on `~` allocations which contain `@` boxes inside the type for
9781 reference counting have been removed.
9782 * The semantics around the lifetimes of temporary expressions have changed,
9783 see #3511 and #11585 for more information.
9784 * Cross-crate syntax extensions are now possible, but feature gated. See
9785 #11151 for more information. This includes both `macro_rules!` macros as
9786 well as syntax extensions such as `format!`.
9787 * New lint modes have been added, and older ones have been turned on to be
9789 * Unnecessary parentheses
9792 * Uppercase variables
9793 * Publicly visible private types
9794 * `#[deriving]` with raw pointers
9795 * Unsafe functions can no longer be coerced to closures.
9796 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9797 * The `#[simd]` attribute is now behind a feature gate.
9798 * Visibility is no longer allowed on `extern crate` statements, and
9799 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9800 * Trailing commas are now allowed in argument lists and tuple patterns.
9801 * The `do` keyword has been removed, it is now a reserved keyword.
9802 * Default type parameters have been implemented, but are feature gated.
9803 * Borrowed variables through captures in closures are now considered soundly.
9804 * `extern mod` is now `extern crate`
9805 * The `Freeze` trait has been removed.
9806 * The `Share` trait has been added for types that can be shared among
9808 * Labels in macros are now hygienic.
9809 * Expression/statement macro invocations can be delimited with `{}` now.
9810 * Treatment of types allowed in `static mut` locations has been tweaked.
9811 * The `*` and `.` operators are now overloadable through the `Deref` and
9813 * `~Trait` and `proc` no longer have `Send` bounds by default.
9814 * Partial type hints are now supported with the `_` type marker.
9815 * An `Unsafe` type was introduced for interior mutability. It is now
9816 considered undefined to transmute from `&T` to `&mut T` without using the
9818 * The #[linkage] attribute was implemented for extern statics/functions.
9819 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9820 * `Pod` was renamed to `Copy`.
9823 * The `libextra` library has been removed. It has now been decomposed into
9824 component libraries with smaller and more focused nuggets of
9825 functionality. The full list of libraries can be found on the
9826 documentation index page.
9827 * std: `std::condition` has been removed. All I/O errors are now propagated
9828 through the `Result` type. In order to assist with error handling, a
9829 `try!` macro for unwrapping errors with an early return and a lint for
9830 unused results has been added. See #12039 for more information.
9831 * std: The `vec` module has been renamed to `slice`.
9832 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9833 This will become the only growable vector in the future.
9834 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9835 are now found at `std::io::BufferedReader` instead of
9836 `std::io::buffered::BufferedReader`.
9837 * std: `print` and `println` are no longer in the prelude, the `print!` and
9838 `println!` macros are intended to be used instead.
9839 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9840 attempts to statically prevent cycles.
9841 * std: The standard distribution is adopting the policy of pushing failure
9842 to the user rather than failing in libraries. Many functions (such as
9843 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9844 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9845 deriving mode: `#[deriving(Show)]`.
9846 * std: `ToStr` is now implemented for all types implementing `Show`.
9847 * std: The formatting trait methods now take `&self` instead of `&T`
9848 * std: The `invert()` method on iterators has been renamed to `rev()`
9849 * std: `std::num` has seen a reduction in the genericity of its traits,
9850 consolidating functionality into a few core traits.
9851 * std: Backtraces are now printed on task failure if the environment
9852 variable `RUST_BACKTRACE` is present.
9853 * std: Naming conventions for iterators have been standardized. More details
9854 can be found on the wiki's style guide.
9855 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9856 still implement the function.
9857 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9858 * std: `assert_approx_eq!` has been removed
9859 * std: The `e` and `E` formatting specifiers for floats have been added to
9860 print them in exponential notation.
9861 * std: The `Times` trait has been removed
9862 * std: Indications of variance and opting out of builtin bounds is done
9863 through marker types in `std::kinds::marker` now
9864 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9865 `#[deriving(Hash)]` is now possible.
9866 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9867 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9868 * std: `Chan::new` is now `channel()`.
9869 * std: A new synchronous channel type has been implemented.
9870 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9871 * std: `hashmap` and `trie` have been moved to `libcollections`
9872 * std: `run` has been rolled into `io::process`
9873 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9874 * std: The equality and comparison traits have seen some reorganization.
9875 * std: `rand` has moved to `librand`.
9876 * std: `to_{lower,upper}case` has been implemented for `char`.
9877 * std: Logging has been moved to `liblog`.
9878 * collections: `HashMap` has been rewritten for higher performance and less
9880 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9881 it can be booted manually. The runtime guide has more information and
9883 * native: All I/O functionality except signals has been implemented.
9884 * green: Task spawning with `libgreen` has been optimized with stack caching
9885 and various trimming of code.
9886 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9887 * sync: The `extra::sync` module has been updated to modern rust (and moved
9888 to the `sync` library), tweaking and improving various interfaces while
9889 dropping redundant functionality.
9890 * sync: A new `Barrier` type has been added to the `sync` library.
9891 * sync: An efficient mutex for native and green tasks has been implemented.
9892 * serialize: The `base64` module has seen some improvement. It treats
9893 newlines better, has non-string error values, and has seen general
9895 * fourcc: A `fourcc!` macro was introduced
9896 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9897 hexadecimal literal.
9900 * `rustpkg` has been deprecated and removed from the main repository. Its
9901 replacement, `cargo`, is under development.
9902 * Nightly builds of rust are now available
9903 * The memory usage of rustc has been improved many times throughout this
9905 * The build process supports disabling rpath support for the rustc binary
9907 * Code generation has improved in some cases, giving more information to the
9908 LLVM optimization passes to enable more extensive optimizations.
9909 * Debuginfo compatibility with lldb on OSX has been restored.
9910 * The master branch is now gated on an android bot, making building for
9911 android much more reliable.
9912 * Output flags have been centralized into one `--emit` flag.
9913 * Crate type flags have been centralized into one `--crate-type` flag.
9914 * Codegen flags have been consolidated behind a `-C` flag.
9915 * Linking against outdated crates now has improved error messages.
9916 * Error messages with lifetimes will often suggest how to annotate the
9917 function to fix the error.
9918 * Many more types are documented in the standard library, and new guides
9920 * Many `rustdoc` improvements:
9921 * code blocks are syntax highlighted.
9922 * render standalone markdown files.
9923 * the --test flag tests all code blocks by default.
9924 * exported macros are displayed.
9925 * re-exported types have their documentation inlined at the location of the
9927 * search works across crates that have been rendered to the same output
9931 Version 0.9 (2014-01-09)
9932 ==========================
9934 * ~1800 changes, numerous bugfixes
9937 * The `float` type has been removed. Use `f32` or `f64` instead.
9938 * A new facility for enabling experimental features (feature gating) has
9939 been added, using the crate-level `#[feature(foo)]` attribute.
9940 * Managed boxes (@) are now behind a feature gate
9941 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9942 standard library's `Gc` or `Rc` types instead.
9943 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9944 * Jumping back to the top of a loop is now done with `continue` instead of
9946 * Strings can no longer be mutated through index assignment.
9947 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9948 hash delimiters, as in `r###"foo"###`.
9949 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9951 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9952 * `@fn`s have been removed.
9953 * `do` only works with procs in order to make it obvious what the cost
9955 * Single-element tuple-like structs can no longer be dereferenced to
9956 obtain the inner value. A more comprehensive solution for overloading
9957 the dereference operator will be provided in the future.
9958 * The `#[link(...)]` attribute has been replaced with
9959 `#[crate_id = "name#vers"]`.
9960 * Empty `impl`s must be terminated with empty braces and may not be
9961 terminated with a semicolon.
9962 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9963 no longer has any special meaning.
9964 * The old `fmt!` string formatting macro has been removed.
9965 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9966 `print!` and `println!`.
9967 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9968 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9969 `extern mod foo = "bar"` instead.
9970 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9971 * Macros can have attributes.
9972 * Macros can expand to items with attributes.
9973 * Macros can expand to multiple items.
9974 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9975 * Comments may be nested.
9976 * Values automatically coerce to trait objects they implement, without
9978 * Enum discriminants are no longer an entire word but as small as needed to
9979 contain all the variants. The `repr` attribute can be used to override
9980 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9981 `#[repr(C)]` to match C enums.
9982 * Non-string literals are not allowed in attributes (they never worked).
9983 * The FFI now supports variadic functions.
9984 * Octal numeric literals, as in `0o7777`.
9985 * The `concat!` syntax extension performs compile-time string concatenation.
9986 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9987 removed as Rust no longer uses segmented stacks.
9988 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9989 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9990 not `*`; ignoring remaining fields of a struct is also done with `..`,
9991 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9992 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9993 * `rustc` supports the "system" calling convention, which defaults to the
9994 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9996 * The `type_overflow` lint (default: warn) checks literals for overflow.
9997 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9998 * The `attribute_usage` lint (default: warn) warns about unknown
10000 * The `unknown_features` lint (default: warn) warns about unknown
10002 * The `dead_code` lint (default: warn) checks for dead code.
10003 * Rust libraries can be linked statically to one another
10004 * `#[link_args]` is behind the `link_args` feature gate.
10005 * Native libraries are now linked with `#[link(name = "foo")]`
10006 * Native libraries can be statically linked to a rust crate
10007 (`#[link(name = "foo", kind = "static")]`).
10008 * Native OS X frameworks are now officially supported
10009 (`#[link(name = "foo", kind = "framework")]`).
10010 * The `#[thread_local]` attribute creates thread-local (not task-local)
10011 variables. Currently behind the `thread_local` feature gate.
10012 * The `return` keyword may be used in closures.
10013 * Types that can be copied via a memcpy implement the `Pod` kind.
10014 * The `cfg` attribute can now be used on struct fields and enum variants.
10017 * std: The `option` and `result` API's have been overhauled to make them
10018 simpler, more consistent, and more composable.
10019 * std: The entire `std::io` module has been replaced with one that is
10020 more comprehensive and that properly interfaces with the underlying
10021 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10023 * std: `io::util` contains a number of useful implementations of
10024 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10025 `ZeroReader`, `TeeReader`.
10026 * std: The reference counted pointer type `extra::rc` moved into std.
10027 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10028 just a wrapper around it).
10029 * std: The `Either` type has been removed.
10030 * std: `fmt::Default` can be implemented for any type to provide default
10031 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10032 * std: The `rand` API continues to be tweaked.
10033 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10034 on failure in gdb, is now named `rust_fail`.
10035 * std: The `each_key` and `each_value` methods on `HashMap` have been
10036 replaced by the `keys` and `values` iterators.
10037 * std: Functions dealing with type size and alignment have moved from the
10038 `sys` module to the `mem` module.
10039 * std: The `path` module was written and API changed.
10040 * std: `str::from_utf8` has been changed to cast instead of allocate.
10041 * std: `starts_with` and `ends_with` methods added to vectors via the
10042 `ImmutableEqVector` trait, which is in the prelude.
10043 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10044 if the index is out of bounds.
10045 * std: Task failure no longer propagates between tasks, as the model was
10046 complex, expensive, and incompatible with thread-based tasks.
10047 * std: The `Any` type can be used for dynamic typing.
10048 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10050 * std: Methods that produce iterators generally do not have an `_iter`
10052 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10053 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10054 * std: `util::ignore` renamed to `prelude::drop`.
10055 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10057 * std: `vec::raw` has seen a lot of cleanup and API changes.
10058 * std: The standard library no longer includes any C++ code, and very
10059 minimal C, eliminating the dependency on libstdc++.
10060 * std: Runtime scheduling and I/O functionality has been factored out into
10061 extensible interfaces and is now implemented by two different crates:
10062 libnative, for native threading and I/O; and libgreen, for green threading
10063 and I/O. This paves the way for using the standard library in more limited
10064 embedded environments.
10065 * std: The `comm` module has been rewritten to be much faster, have a
10066 simpler, more consistent API, and to work for both native and green
10068 * std: All libuv dependencies have been moved into the rustuv crate.
10069 * native: New implementations of runtime scheduling on top of OS threads.
10070 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10072 * green: The green thread scheduler and message passing types are almost
10073 entirely lock-free.
10074 * extra: The `flatpipes` module had bitrotted and was removed.
10075 * extra: All crypto functions have been removed and Rust now has a policy of
10076 not reimplementing crypto in the standard library. In the future crypto
10077 will be provided by external crates with bindings to established libraries.
10078 * extra: `c_vec` has been modernized.
10079 * extra: The `sort` module has been removed. Use the `sort` method on
10083 * The `rust` and `rusti` commands have been removed, due to lack of
10085 * `rustdoc` was completely rewritten.
10086 * `rustdoc` can test code examples in documentation.
10087 * `rustpkg` can test packages with the argument, 'test'.
10088 * `rustpkg` supports arbitrary dependencies, including C libraries.
10089 * `rustc`'s support for generating debug info is improved again.
10090 * `rustc` has better error reporting for unbalanced delimiters.
10091 * `rustc`'s JIT support was removed due to bitrot.
10092 * Executables and static libraries can be built with LTO (-Z lto)
10093 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10097 Version 0.8 (2013-09-26)
10098 ============================
10100 * ~2200 changes, numerous bugfixes
10103 * The `for` loop syntax has changed to work with the `Iterator` trait.
10104 * At long last, unwinding works on Windows.
10105 * Default methods are ready for use.
10106 * Many trait inheritance bugs fixed.
10107 * Owned and borrowed trait objects work more reliably.
10108 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10109 * rustc can omit emission of code for the `debug!` macro if it is passed
10111 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10112 for foo.rs, then foo/mod.rs, and will generate an error when both are
10114 * Strings no longer contain trailing nulls. The new `std::c_str` module
10115 provides new mechanisms for converting to C strings.
10116 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10117 * The FFI has been overhauled such that foreign functions are called directly,
10118 instead of through a stack-switching wrapper.
10119 * Calling a foreign function must be done through a Rust function with the
10120 `#[fixed_stack_segment]` attribute.
10121 * The `externfn!` macro can be used to declare both a foreign function and
10122 a `#[fixed_stack_segment]` wrapper at once.
10123 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10124 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10125 * `priv` is disallowed everywhere except for struct fields and enum variants.
10126 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10127 * `ref` bindings in irrefutable patterns work correctly now.
10128 * `char` is now prevented from containing invalid code points.
10129 * Casting to `bool` is no longer allowed.
10130 * `\0` is now accepted as an escape in chars and strings.
10131 * `yield` is a reserved keyword.
10132 * `typeof` is a reserved keyword.
10133 * Crates may be imported by URL with `extern mod foo = "url";`.
10134 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10135 * Static vectors can be initialized with repeating elements,
10136 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10137 * Static structs can be initialized with functional record update,
10138 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10139 * `cfg!` can be used to conditionally execute code based on the crate
10140 configuration, similarly to `#[cfg(...)]`.
10141 * The `unnecessary_qualification` lint detects unneeded module
10142 prefixes (default: allow).
10143 * Arithmetic operations have been implemented on the SIMD types in
10144 `std::unstable::simd`.
10145 * Exchange allocation headers were removed, reducing memory usage.
10146 * `format!` implements a completely new, extensible, and higher-performance
10147 string formatting system. It will replace `fmt!`.
10148 * `print!` and `println!` write formatted strings (using the `format!`
10149 extension) to stdout.
10150 * `write!` and `writeln!` write formatted strings (using the `format!`
10151 extension) to the new Writers in `std::rt::io`.
10152 * The library section in which a function or static is placed may
10153 be specified with `#[link_section = "..."]`.
10154 * The `proto!` syntax extension for defining bounded message protocols
10156 * `macro_rules!` is hygienic for `let` declarations.
10157 * The `#[export_name]` attribute specifies the name of a symbol.
10158 * `unreachable!` can be used to indicate unreachable code, and fails
10162 * std: Transitioned to the new runtime, written in Rust.
10163 * std: Added an experimental I/O library, `rt::io`, based on the new
10165 * std: A new generic `range` function was added to the prelude, replacing
10166 `uint::range` and friends.
10167 * std: `range_rev` no longer exists. Since range is an iterator it can be
10168 reversed with `range(lo, hi).invert()`.
10169 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10170 renamed to `unwrap_or`.
10171 * std: The `iterator` module was renamed to `iter`.
10172 * std: Integral types now support the `checked_add`, `checked_sub`, and
10173 `checked_mul` operations for detecting overflow.
10174 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10176 * std: Methods are standardizing on conventions for casting methods:
10177 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10179 * std: The `CString` type in `c_str` provides new ways to convert to and
10181 * std: `DoubleEndedIterator` can yield elements in two directions.
10182 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10184 * std: `str::from_bytes` renamed to `str::from_utf8`.
10185 * std: `pop_opt` and `shift_opt` methods added to vectors.
10186 * std: The task-local data interface no longer uses @, and keys are
10187 no longer function pointers.
10188 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10189 * std: Added `SharedPort` to `comm`.
10190 * std: `Eq` has a default method for `ne`; only `eq` is required
10191 in implementations.
10192 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10193 is required in implementations.
10194 * std: `is_utf8` performance is improved, impacting many string functions.
10195 * std: `os::MemoryMap` provides cross-platform mmap.
10196 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10197 are not 'in-bounds' are considered undefined.
10198 * std: Many freestanding functions in `vec` removed in favor of methods.
10199 * std: Many freestanding functions on scalar types removed in favor of
10201 * std: Many options to task builders were removed since they don't make
10202 sense in the new scheduler design.
10203 * std: More containers implement `FromIterator` so can be created by the
10205 * std: More complete atomic types in `unstable::atomics`.
10206 * std: `comm::PortSet` removed.
10207 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10208 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10209 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10210 default implementations.
10211 * std: Various `from_str` functions were removed in favor of a generic
10212 `from_str` which is available in the prelude.
10213 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10214 * extra: `dlist`, the doubly-linked list was modernized.
10215 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10216 * extra: Added `glob` module, replacing `std::os::glob`.
10217 * extra: `rope` was removed.
10218 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10219 * extra: `net`, and `timer` were removed. The experimental replacements
10220 are `std::rt::io::net` and `std::rt::io::timer`.
10221 * extra: Iterators implemented for `SmallIntMap`.
10222 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10223 * extra: `SmallIntSet` removed. Use `BitvSet`.
10224 * extra: Performance of JSON parsing greatly improved.
10225 * extra: `semver` updated to SemVer 2.0.0.
10226 * extra: `term` handles more terminals correctly.
10227 * extra: `dbg` module removed.
10228 * extra: `par` module removed.
10229 * extra: `future` was cleaned up, with some method renames.
10230 * extra: Most free functions in `getopts` were converted to methods.
10233 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10234 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10235 similarly to gcc's `--march` flag.
10236 * rustc's performance compiling small crates is much better.
10237 * rustpkg has received many improvements.
10238 * rustpkg supports git tags as package IDs.
10239 * rustpkg builds into target-specific directories so it can be used for
10241 * The number of concurrent test tasks is controlled by the environment
10242 variable RUST_TEST_TASKS.
10243 * The test harness can now report metrics for benchmarks.
10244 * All tools have man pages.
10245 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10246 * The runtime uses jemalloc for allocations.
10247 * Segmented stacks are temporarily disabled as part of the transition to
10248 the new runtime. Stack overflows are possible!
10249 * A new documentation backend, rustdoc_ng, is available for use. It is
10250 still invoked through the normal `rustdoc` command.
10253 Version 0.7 (2013-07-03)
10254 =======================
10256 * ~2000 changes, numerous bugfixes
10259 * `impl`s no longer accept a visibility qualifier. Put them on methods
10261 * The borrow checker has been rewritten with flow-sensitivity, fixing
10262 many bugs and inconveniences.
10263 * The `self` parameter no longer implicitly means `&'self self`,
10264 and can be explicitly marked with a lifetime.
10265 * Overloadable compound operators (`+=`, etc.) have been temporarily
10266 removed due to bugs.
10267 * The `for` loop protocol now requires `for`-iterators to return `bool`
10268 so they compose better.
10269 * The `Durable` trait is replaced with the `'static` bounds.
10270 * Trait default methods work more often.
10271 * Structs with the `#[packed]` attribute have byte alignment and
10272 no padding between fields.
10273 * Type parameters bound by `Copy` must now be copied explicitly with
10274 the `copy` keyword.
10275 * It is now illegal to move out of a dereferenced unsafe pointer.
10276 * `Option<~T>` is now represented as a nullable pointer.
10277 * `@mut` does dynamic borrow checks correctly.
10278 * The `main` function is only detected at the topmost level of the crate.
10279 The `#[main]` attribute is still valid anywhere.
10280 * Struct fields may no longer be mutable. Use inherited mutability.
10281 * The `#[no_send]` attribute makes a type that would otherwise be
10283 * The `#[no_freeze]` attribute makes a type that would otherwise be
10285 * Unbounded recursion will abort the process after reaching the limit
10286 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10287 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10288 are never implicitly copyable.
10289 * `#[static_assert]` makes compile-time assertions about static bools.
10290 * At long last, 'argument modes' no longer exist.
10291 * The rarely used `use mod` statement no longer exists.
10293 * Syntax extensions
10294 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10296 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10297 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10298 `#[deriving(...)]`.
10299 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10300 and unsuffixed integer literals.
10303 * The `core` crate was renamed to `std`.
10304 * The `std` crate was renamed to `extra`.
10305 * More and improved documentation.
10306 * std: `iterator` module for external iterator objects.
10307 * Many old-style (internal, higher-order function) iterators replaced by
10308 implementations of `Iterator`.
10309 * std: Many old internal vector and string iterators,
10310 incl. `any`, `all`. removed.
10311 * std: The `finalize` method of `Drop` renamed to `drop`.
10312 * std: The `drop` method now takes `&mut self` instead of `&self`.
10313 * std: The prelude no longer re-exports any modules, only types and traits.
10314 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10315 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10316 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10317 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10318 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10319 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10320 * std: Many types implement `Clone`.
10321 * std: `path` type renamed to `Path`.
10322 * std: `mut` module and `Mut` type removed.
10323 * std: Many standalone functions removed in favor of methods and iterators
10324 in `vec`, `str`. In the future methods will also work as functions.
10325 * std: `reinterpret_cast` removed. Use `transmute`.
10326 * std: ascii string handling in `std::ascii`.
10327 * std: `Rand` is implemented for ~/@.
10328 * std: `run` module for spawning processes overhauled.
10329 * std: Various atomic types added to `unstable::atomic`.
10330 * std: Various types implement `Zero`.
10331 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10332 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10333 * std: Added `os::mkdir_recursive`.
10334 * std: Added `os::glob` function performs filesystems globs.
10335 * std: `FuzzyEq` renamed to `ApproxEq`.
10336 * std: `Map` now defines `pop` and `swap` methods.
10337 * std: `Cell` constructors converted to static methods.
10338 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10339 * extra: `flate` module moved from `std` to `extra`.
10340 * extra: `fileinput` module for iterating over a series of files.
10341 * extra: `Complex` number type and `complex` module.
10342 * extra: `Rational` number type and `rational` module.
10343 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10344 * extra: `term` uses terminfo now, is more correct.
10345 * extra: `arc` functions converted to methods.
10346 * extra: Implementation of fixed output size variations of SHA-2.
10349 * `unused_variables` lint mode for unused variables (default: warn).
10350 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10352 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10354 * `dead_assignment` lint mode for unread variables (default: warn).
10355 * `unnecessary_allocation` lint mode detects some heap allocations that are
10356 immediately borrowed so could be written without allocating (default: warn).
10357 * `missing_doc` lint mode (default: allow).
10358 * `unreachable_code` lint mode (default: warn).
10359 * The `rusti` command has been rewritten and a number of bugs addressed.
10360 * rustc outputs in color on more terminals.
10361 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10362 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10363 * Compiling with `-g` will make the binary record information about
10364 dynamic borrowcheck failures for debugging.
10365 * rustdoc has a nicer stylesheet.
10366 * Various improvements to rustdoc.
10367 * Improvements to rustpkg (see the detailed release notes).
10370 Version 0.6 (2013-04-03)
10371 ========================
10373 * ~2100 changes, numerous bugfixes
10376 * The self type parameter in traits is now spelled `Self`
10377 * The `self` parameter in trait and impl methods must now be explicitly
10378 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10379 * Static methods no longer require the `static` keyword and instead
10380 are distinguished by the lack of a `self` parameter
10381 * Replaced the `Durable` trait with the `'static` lifetime
10382 * The old closure type syntax with the trailing sigil has been
10383 removed in favor of the more consistent leading sigil
10384 * `super` is a keyword, and may be prefixed to paths
10385 * Trait bounds are separated with `+` instead of whitespace
10386 * Traits are implemented with `impl Trait for Type`
10387 instead of `impl Type: Trait`
10388 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10389 * The `export` keyword has finally been removed
10390 * The `move` keyword has been removed (see "Semantic changes")
10391 * The interior mutability qualifier on vectors, `[mut T]`, has been
10392 removed. Use `&mut [T]`, etc.
10393 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10394 * `fail` is no longer a keyword. Use `fail!()`
10395 * `assert` is no longer a keyword. Use `assert!()`
10396 * `log` is no longer a keyword. use `debug!`, etc.
10397 * 1-tuples may be represented as `(T,)`
10398 * Struct fields may no longer be `mut`. Use inherited mutability,
10399 `@mut T`, `core::mut` or `core::cell`
10400 * `extern mod { ... }` is no longer valid syntax for foreign
10401 function modules. Use extern blocks: `extern { ... }`
10402 * Newtype enums removed. Use tuple-structs.
10403 * Trait implementations no longer support visibility modifiers
10404 * Pattern matching over vectors improved and expanded
10405 * `const` renamed to `static` to correspond to lifetime name,
10406 and make room for future `static mut` unsafe mutable globals.
10407 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10408 * `Clone` implementations can be automatically generated with
10409 `#[deriving(Clone)]`
10410 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10411 instead of `foo as Bar`.
10412 * Fixed length vector types are now written as `[int, .. 3]`
10413 instead of `[int * 3]`.
10414 * Fixed length vector types can express the length as a constant
10415 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10418 * Types with owned pointers or custom destructors move by default,
10419 eliminating the `move` keyword
10420 * All foreign functions are considered unsafe
10421 * &mut is now unaliasable
10422 * Writes to borrowed @mut pointers are prevented dynamically
10424 * The name of the main function can be customized using #[main]
10425 * The default type of an inferred closure is &fn instead of @fn
10426 * `use` statements may no longer be "chained" - they cannot import
10427 identifiers imported by previous `use` statements
10428 * `use` statements are crate relative, importing from the "top"
10429 of the crate by default. Paths may be prefixed with `super::`
10430 or `self::` to change the search behavior.
10431 * Method visibility is inherited from the implementation declaration
10432 * Structural records have been removed
10433 * Many more types can be used in static items, including enums
10434 'static-lifetime pointers and vectors
10435 * Pattern matching over vectors improved and expanded
10436 * Typechecking of closure types has been overhauled to
10437 improve inference and eliminate unsoundness
10438 * Macros leave scope at the end of modules, unless that module is
10439 tagged with #[macro_escape]
10442 * Added big integers to `std::bigint`
10443 * Removed `core::oldcomm` module
10444 * Added pipe-based `core::comm` module
10445 * Numeric traits have been reorganized under `core::num`
10446 * `vec::slice` finally returns a slice
10447 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10448 * Containers reorganized around traits in `core::container`
10449 * `core::dvec` removed, `~[T]` is a drop-in replacement
10450 * `core::send_map` renamed to `core::hashmap`
10451 * `std::map` removed; replaced with `core::hashmap`
10452 * `std::treemap` reimplemented as an owned balanced tree
10453 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10454 * `core::trie` added as a fast ordered map for integer keys
10455 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10456 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10457 overload the comparison operators, whereas `TotalOrd` is used
10458 by certain container types
10461 * Replaced the 'cargo' package manager with 'rustpkg'
10462 * Added all-purpose 'rust' tool
10463 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10464 * rustc now *attempts* to offer spelling suggestions
10465 * Improved support for ARM and Android
10466 * Preliminary MIPS backend
10467 * Improved foreign function ABI implementation for x86, x86_64
10468 * Various memory usage improvements
10469 * Rust code may be embedded in foreign code under limited circumstances
10470 * Inline assembler supported by new asm!() syntax extension.
10473 Version 0.5 (2012-12-21)
10474 ===========================
10476 * ~900 changes, numerous bugfixes
10479 * Removed `<-` move operator
10480 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10481 * Removed old fixed length vector syntax - `[T]/N`
10482 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10483 * Macros may now expand to items and statements
10484 * `a.b()` is always parsed as a method call, never as a field projection
10485 * `Eq` and `IterBytes` implementations can be automatically generated
10486 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10487 * Removed the special crate language for `.rc` files
10488 * Function arguments may consist of any irrefutable pattern
10491 * `&` and `~` pointers may point to objects
10492 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10493 * Enum variants may be structs
10494 * Destructors can be added to all nominal types with the Drop trait
10495 * Structs and nullary enum variants may be constants
10496 * Values that cannot be implicitly copied are now automatically moved
10497 without writing `move` explicitly
10498 * `&T` may now be coerced to `*T`
10499 * Coercions happen in `let` statements as well as function calls
10500 * `use` statements now take crate-relative paths
10501 * The module and type namespaces have been merged so that static
10502 method names can be resolved under the trait in which they are
10505 * Improved support for language features
10506 * Trait inheritance works in many scenarios
10507 * More support for explicit self arguments in methods - `self`, `&self`
10508 `@self`, and `~self` all generally work as expected
10509 * Static methods work in more situations
10510 * Experimental: Traits may declare default methods for the implementations
10514 * New condition handling system in `core::condition`
10515 * Timsort added to `std::sort`
10516 * New priority queue, `std::priority_queue`
10517 * Pipes for serializable types, `std::flatpipes'
10518 * Serialization overhauled to be trait-based
10519 * Expanded `getopts` definitions
10520 * Moved futures to `std`
10521 * More functions are pure now
10522 * `core::comm` renamed to `oldcomm`. Still deprecated
10523 * `rustdoc` and `cargo` are libraries now
10526 * Added a preliminary REPL, `rusti`
10527 * License changed from MIT to dual MIT/APL2
10530 Version 0.4 (2012-10-15)
10531 ==========================
10533 * ~2000 changes, numerous bugfixes
10536 * All keywords are now strict and may not be used as identifiers anywhere
10537 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10538 'of', 'with', 'to', 'class'.
10539 * Classes are replaced with simpler structs
10540 * Explicit method self types
10541 * `ret` became `return` and `alt` became `match`
10542 * `import` is now `use`; `use is now `extern mod`
10543 * `extern mod { ... }` is now `extern { ... }`
10544 * `use mod` is the recommended way to import modules
10545 * `pub` and `priv` replace deprecated export lists
10546 * The syntax of `match` pattern arms now uses fat arrow (=>)
10547 * `main` no longer accepts an args vector; use `os::args` instead
10550 * Trait implementations are now coherent, ala Haskell typeclasses
10551 * Trait methods may be static
10552 * Argument modes are deprecated
10553 * Borrowed pointers are much more mature and recommended for use
10554 * Strings and vectors in the static region are stored in constant memory
10555 * Typestate was removed
10556 * Resolution rewritten to be more reliable
10557 * Support for 'dual-mode' data structures (freezing and thawing)
10560 * Most binary operators can now be overloaded via the traits in
10562 * `std::net::url` for representing URLs
10563 * Sendable hash maps in `core::send_map`
10564 * `core::task' gained a (currently unsafe) task-local storage API
10567 * An efficient new intertask communication primitive called the pipe,
10568 along with a number of higher-level channel types, in `core::pipes`
10569 * `std::arc`, an atomically reference counted, immutable, shared memory
10571 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10572 * Futures are now based on pipes and sendable
10573 * More robust linked task failure
10574 * Improved task builder API
10577 * Improved error reporting
10578 * Preliminary JIT support
10579 * Preliminary work on precise GC
10580 * Extensive architectural improvements to rustc
10581 * Begun a transition away from buggy C++-based reflection (shape) code to
10582 Rust-based (visitor) code
10583 * All hash functions and tables converted to secure, randomized SipHash
10586 Version 0.3 (2012-07-12)
10587 ========================
10589 * ~1900 changes, numerous bugfixes
10591 * New coding conveniences
10592 * Integer-literal suffix inference
10593 * Per-item control over warnings, errors
10594 * #[cfg(windows)] and #[cfg(unix)] attributes
10595 * Documentation comments
10596 * More compact closure syntax
10597 * 'do' expressions for treating higher-order functions as
10599 * *-patterns (wildcard extended to all constructor fields)
10602 * Name resolution pass and exhaustiveness checker rewritten
10603 * Region pointers and borrow checking supersede alias
10605 * Init-ness checking is now provided by a region-based liveness
10606 pass instead of the typestate pass; same for last-use analysis
10607 * Extensive work on region pointers
10609 * Experimental new language features
10610 * Slices and fixed-size, interior-allocated vectors
10611 * #!-comments for lang versioning, shell execution
10612 * Destructors and iface implementation for classes;
10613 type-parameterized classes and class methods
10614 * 'const' type kind for types that can be used to implement
10615 shared-memory concurrency patterns
10619 * Removal of various obsolete features
10620 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10621 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10623 * Constructs: do-while loops ('do' repurposed), fn binding,
10624 resources (replaced by destructors)
10626 * Compiler reorganization
10627 * Syntax-layer of compiler split into separate crate
10628 * Clang (from LLVM project) integrated into build
10629 * Typechecker split into sub-modules
10632 * New time functions
10633 * Extension methods for many built-in types
10634 * Arc: atomic-refcount read-only / exclusive-use shared cells
10635 * Par: parallel map and search routines
10636 * Extensive work on libuv interface
10637 * Much vector code moved to libraries
10638 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10639 #include, #include_str, #include_bin
10641 * Tool improvements
10642 * Cargo automatically resolves dependencies
10645 Version 0.2 (2012-03-29)
10646 =========================
10648 * >1500 changes, numerous bugfixes
10650 * New docs and doc tooling
10652 * New port: FreeBSD x86_64
10654 * Compilation model enhancements
10655 * Generics now specialized, multiply instantiated
10656 * Functions now inlined across separate crates
10658 * Scheduling, stack and threading fixes
10659 * Noticeably improved message-passing performance
10660 * Explicit schedulers
10664 * Experimental new language features
10665 * Operator overloading
10669 * Various language extensions
10670 * C-callback function types: 'crust fn ...'
10671 * Infinite-loop construct: 'loop { ... }'
10672 * Shorten 'mutable' to 'mut'
10673 * Required mutable-local qualifier: 'let mut ...'
10674 * Basic glob-exporting: 'export foo::*;'
10675 * Alt now exhaustive, 'alt check' for runtime-checked
10676 * Block-function form of 'for' loop, with 'break' and 'ret'.
10679 * AST quasi-quote syntax extension
10680 * Revived libuv interface
10681 * New modules: core::{future, iter}, std::arena
10682 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10683 * Extensive cleanup, regularization in libstd, libcore
10686 Version 0.1 (2012-01-20)
10687 ===============================
10689 * Most language features work, including:
10690 * Unique pointers, unique closures, move semantics
10691 * Interface-constrained generics
10692 * Static interface dispatch
10694 * Multithread task scheduling
10695 * Typestate predicates
10696 * Failure unwinding, destructors
10697 * Pattern matching and destructuring assignment
10698 * Lightweight block-lambda syntax
10699 * Preliminary macro-by-example
10701 * Compiler works with the following configurations:
10702 * Linux: x86 and x86_64 hosts and targets
10703 * macOS: x86 and x86_64 hosts and targets
10704 * Windows: x86 hosts and targets
10706 * Cross compilation / multi-target configuration supported.
10708 * Preliminary API-documentation and package-management tools included.
10712 * Documentation is incomplete.
10714 * Performance is below intended target.
10716 * Standard library APIs are subject to extensive change, reorganization.
10718 * Language-level versioning is not yet operational - future code will
10719 break unexpectedly.