1 Version 1.57.0 (2021-12-02)
2 ==========================
7 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
8 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
9 - [Allow panicking in constant evaluation.][89508]
14 - [Create more accurate debuginfo for vtables.][89597]
15 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
16 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
17 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
18 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
20 \* Refer to Rust's [platform support page][platform-support-doc] for more
21 information on Rust's tiered platform support.
26 - [Avoid allocations and copying in `Vec::leak`][89337]
27 - [Add `#[repr(i8)]` to `Ordering`][89507]
28 - [Optimize `File::read_to_end` and `read_to_string`][89582]
29 - [Update to Unicode 14.0][89614]
30 - [Many more functions are marked `#[must_use]`][89692], producing a warning
31 when ignoring their return value. This helps catch mistakes such as expecting
32 a function to mutate a value in place rather than return a new value.
37 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
38 - [`[T; N]::as_slice`][`array::as_slice`]
39 - [`collections::TryReserveError`]
40 - [`HashMap::try_reserve`]
41 - [`HashSet::try_reserve`]
42 - [`String::try_reserve`]
43 - [`String::try_reserve_exact`]
44 - [`Vec::try_reserve`]
45 - [`Vec::try_reserve_exact`]
46 - [`VecDeque::try_reserve`]
47 - [`VecDeque::try_reserve_exact`]
48 - [`Iterator::map_while`]
50 - [`proc_macro::is_available`]
51 - [`Command::get_program`]
52 - [`Command::get_args`]
53 - [`Command::get_envs`]
54 - [`Command::get_current_dir`]
58 These APIs are now usable in const contexts:
60 - [`hint::unreachable_unchecked`]
65 - [Stabilize custom profiles][cargo/9943]
72 These changes provide no direct user facing benefits, but represent significant
73 improvements to the internals and overall performance of rustc
76 - [Added an experimental backend for codegen with `libgccjit`.][87260]
78 [86191]: https://github.com/rust-lang/rust/pull/86191/
79 [87220]: https://github.com/rust-lang/rust/pull/87220/
80 [87260]: https://github.com/rust-lang/rust/pull/87260/
81 [88243]: https://github.com/rust-lang/rust/pull/88243/
82 [88321]: https://github.com/rust-lang/rust/pull/88321/
83 [88529]: https://github.com/rust-lang/rust/pull/88529/
84 [88690]: https://github.com/rust-lang/rust/pull/88690/
85 [88952]: https://github.com/rust-lang/rust/pull/88952/
86 [89337]: https://github.com/rust-lang/rust/pull/89337/
87 [89507]: https://github.com/rust-lang/rust/pull/89507/
88 [89508]: https://github.com/rust-lang/rust/pull/89508/
89 [89582]: https://github.com/rust-lang/rust/pull/89582/
90 [89597]: https://github.com/rust-lang/rust/pull/89597/
91 [89614]: https://github.com/rust-lang/rust/pull/89614/
92 [89692]: https://github.com/rust-lang/rust/issues/89692/
93 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
94 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
95 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
96 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
97 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
98 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
99 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
100 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
101 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
102 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
103 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
104 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
105 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
106 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
107 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
108 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
109 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
110 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
111 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
112 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
113 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
115 Version 1.56.1 (2021-11-01)
116 ===========================
118 - New lints to detect the presence of bidirectional-override Unicode
119 codepoints in the compiled source code ([CVE-2021-42574])
121 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
123 Version 1.56.0 (2021-10-21)
124 ========================
129 - [The 2021 Edition is now stable.][rust#88100]
130 See [the edition guide][rust-2021-edition-guide] for more details.
131 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
132 - [Union field access is permitted in `const fn`.][rust#85769]
134 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
139 - [Upgrade to LLVM 13.][rust#87570]
140 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
141 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
142 - [Warnings can be forced on with `--force-warn`.][rust#87472]
143 This feature is primarily intended for usage by `cargo fix`, rather than end users.
144 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
145 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
146 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
148 \* Refer to Rust's [platform support page][platform-support-doc] for more
149 information on Rust's tiered platform support.
154 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
155 The Windows console still requires valid Unicode, but this change allows
156 splitting a UTF-8 character across multiple write calls. This allows, for
157 instance, programs that just read and write data buffers (e.g. copying a file
158 to stdout) without regard for Unicode or character boundaries.
159 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
160 For this use case, atomics scale much better under contention.
161 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
162 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
163 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
164 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
165 - [Treat invalid environment variable names as non-existent.][rust#86183]
166 Previously, the environment functions would panic if given a variable name
167 with an internal null character or equal sign (`=`). Now, these functions will
168 just treat such names as non-existent variables, since the OS cannot represent
169 the existence of a variable with such a name.
174 - [`std::os::unix::fs::chroot`]
175 - [`UnsafeCell::raw_get`]
176 - [`BufWriter::into_parts`]
177 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
178 These APIs were previously stable in `std`, but are now also available in `core`.
180 - [`String::shrink_to`]
181 - [`OsString::shrink_to`]
182 - [`PathBuf::shrink_to`]
183 - [`BinaryHeap::shrink_to`]
184 - [`VecDeque::shrink_to`]
185 - [`HashMap::shrink_to`]
186 - [`HashSet::shrink_to`]
188 These APIs are now usable in const contexts:
190 - [`std::mem::transmute`]
191 - [`[T]::first`][`slice::first`]
192 - [`[T]::split_first`][`slice::split_first`]
193 - [`[T]::last`][`slice::last`]
194 - [`[T]::split_last`][`slice::split_last`]
199 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
200 This has no effect at present on dependency version selection.
201 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
202 that support Rust code to include a crate's specified minimum version in the test matrix for that
208 - [Update to new argument parsing rules on Windows.][rust#87580]
209 This adjusts Rust's standard library to match the behavior of the standard
210 libraries for C/C++. The rules have changed slightly over time, and this PR
211 brings us to the latest set of rules (changed in 2008).
212 - [Disallow the aapcs calling convention on aarch64][rust#88399]
213 This was already not supported by LLVM; this change surfaces this lack of
214 support with a better error message.
215 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
216 - [Warn when an escaped newline skips multiple lines.][rust#87671]
217 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
218 may return different values on glibc <= 2.24.][rust#81825]
219 Rust now invokes the `clone3` system call directly, when available, to use new functionality
220 available via that system call. Older versions of glibc cache the result of `getpid`, and only
221 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
222 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
226 These changes provide no direct user facing benefits, but represent significant
227 improvements to the internals and overall performance of rustc
230 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
231 This improves the performance of most Rust builds.
232 - [Unify representation of macros in internal data structures.][rust#88019]
233 This change fixes a host of bugs with the handling of macros by the compiler,
236 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
237 [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
238 [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
239 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
240 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
241 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
242 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
243 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
244 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
245 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
246 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
247 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
248 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
249 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
250 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
251 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
252 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
253 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
254 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
255 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
256 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
257 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
258 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
259 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
260 [rust#86860]: https://github.com/rust-lang/rust/pull/86860
261 [rust#84039]: https://github.com/rust-lang/rust/pull/84039
262 [rust#86492]: https://github.com/rust-lang/rust/pull/86492
263 [rust#88363]: https://github.com/rust-lang/rust/pull/88363
264 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
265 [rust#87832]: https://github.com/rust-lang/rust/pull/87832
266 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
267 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
268 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
269 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
270 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
271 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
272 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
273 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
274 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
275 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
276 [rust#88177]: https://github.com/rust-lang/rust/pull/88177
277 [rust#88548]: https://github.com/rust-lang/rust/pull/88548
278 [rust#88551]: https://github.com/rust-lang/rust/pull/88551
279 [rust#88299]: https://github.com/rust-lang/rust/pull/88299
280 [rust#88220]: https://github.com/rust-lang/rust/pull/88220
281 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
282 [rust#86879]: https://github.com/rust-lang/rust/pull/86879
283 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
284 [rust#84662]: https://github.com/rust-lang/rust/pull/84662
285 [rust#86593]: https://github.com/rust-lang/rust/pull/86593
286 [rust#81050]: https://github.com/rust-lang/rust/pull/81050
287 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
288 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
289 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
290 [rust#88490]: https://github.com/rust-lang/rust/pull/88490
291 [rust#88269]: https://github.com/rust-lang/rust/pull/88269
292 [rust#84176]: https://github.com/rust-lang/rust/pull/84176
293 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
294 [rust#88227]: https://github.com/rust-lang/rust/pull/88227
295 [rust#88200]: https://github.com/rust-lang/rust/pull/88200
296 [rust#82776]: https://github.com/rust-lang/rust/pull/82776
297 [rust#88077]: https://github.com/rust-lang/rust/pull/88077
298 [rust#87728]: https://github.com/rust-lang/rust/pull/87728
299 [rust#87050]: https://github.com/rust-lang/rust/pull/87050
300 [rust#87619]: https://github.com/rust-lang/rust/pull/87619
301 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
302 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
303 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
305 Version 1.55.0 (2021-09-09)
306 ============================
310 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
311 will end at the maximum value of the integer.][83918]
312 - [You can now explicitly import the prelude of different editions
313 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
317 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
319 \* Refer to Rust's [platform support page][platform-support-doc] for more
320 information on Rust's tiered platform support.
325 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
326 These improvements should in general provide faster string parsing of floats,
327 no longer reject certain valid floating point values, and reduce
328 the produced code size for non-stripped artifacts.
329 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
336 - [`IntoInnerError::into_error`]
337 - [`IntoInnerError::into_parts`]
338 - [`MaybeUninit::assume_init_mut`]
339 - [`MaybeUninit::assume_init_ref`]
340 - [`MaybeUninit::write`]
342 - [`ops::ControlFlow`]
344 - [`x86::_bittestandcomplement`]
345 - [`x86::_bittestandreset`]
346 - [`x86::_bittestandset`]
347 - [`x86_64::_bittest64`]
348 - [`x86_64::_bittestandcomplement64`]
349 - [`x86_64::_bittestandreset64`]
350 - [`x86_64::_bittestandset64`]
352 The following previously stable functions are now `const`.
354 - [`str::from_utf8_unchecked`]
359 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
360 rustc in parallel such as when using `cargo test`.][cargo/9675]
361 - [The package definition in `cargo metadata` now includes the `"default_run"`
362 field from the manifest.][cargo/9550]
363 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
364 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
365 of packages.][cargo/9663]
369 - [Added "Go to item on exact match" search option.][85876]
370 - [The "Implementors" section on traits no longer shows redundant
371 method definitions.][85970]
372 - [Trait implementations are toggled open by default.][86260] This should make the
373 implementations more searchable by tools like `CTRL+F` in your browser.
374 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
375 through type aliases.][86334]
376 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
377 "Trait Implementations" section.][86513]
382 - [std functions that return an `io::Error` will no longer use the
383 `ErrorKind::Other` variant.][85746] This is to better reflect that these
384 kinds of errors could be categorised [into newer more specific `ErrorKind`
385 variants][79965], and that they do not represent a user error.
386 - [Using environment variable names with `process::Command` on Windows now
387 behaves as expected.][85270] Previously using envionment variables with
388 `Command` would cause them to be ASCII-uppercased.
389 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
390 with `rustdoc::`][86849]
392 [86849]: https://github.com/rust-lang/rust/pull/86849
393 [86513]: https://github.com/rust-lang/rust/pull/86513
394 [86334]: https://github.com/rust-lang/rust/pull/86334
395 [86260]: https://github.com/rust-lang/rust/pull/86260
396 [85970]: https://github.com/rust-lang/rust/pull/85970
397 [85876]: https://github.com/rust-lang/rust/pull/85876
398 [83572]: https://github.com/rust-lang/rust/pull/83572
399 [86294]: https://github.com/rust-lang/rust/pull/86294
400 [86858]: https://github.com/rust-lang/rust/pull/86858
401 [86761]: https://github.com/rust-lang/rust/pull/86761
402 [85769]: https://github.com/rust-lang/rust/pull/85769
403 [85746]: https://github.com/rust-lang/rust/pull/85746
404 [85305]: https://github.com/rust-lang/rust/pull/85305
405 [85270]: https://github.com/rust-lang/rust/pull/85270
406 [84111]: https://github.com/rust-lang/rust/pull/84111
407 [83918]: https://github.com/rust-lang/rust/pull/83918
408 [79965]: https://github.com/rust-lang/rust/pull/79965
409 [87370]: https://github.com/rust-lang/rust/pull/87370
410 [87298]: https://github.com/rust-lang/rust/pull/87298
411 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
412 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
413 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
414 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
415 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
416 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
417 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
418 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
419 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
420 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
421 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
422 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
423 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
424 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
425 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
426 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
427 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
428 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
429 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
430 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
431 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
432 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
433 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
434 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
437 Version 1.54.0 (2021-07-29)
438 ============================
441 -----------------------
443 - [You can now use macros for values in some built-in attributes.][83366]
444 This primarily allows you to call macros within the `#[doc]` attribute. For
445 example, to include external documentation in your crate, you can now write
448 #![doc = include_str!("README.md")]
451 - [You can now cast between unsized slice types (and types which contain
452 unsized slices) in `const fn`.][85078]
453 - [You can now use multiple generic lifetimes with `impl Trait` where the
454 lifetimes don't explicitly outlive another.][84701] In code this means
455 that you can now have `impl Trait<'a, 'b>` where as before you could
456 only have `impl Trait<'a, 'b> where 'b: 'a`.
459 -----------------------
461 - [Rustc will now search for custom JSON targets in
462 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
463 directory.][83800] You can find your sysroot directory by running
464 `rustc --print sysroot`.
465 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
466 - [You can now use `#[target_feature]` on safe functions when targeting
467 WebAssembly platforms.][84988]
468 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
469 - [Added tier 3\* support for `bpfel-unknown-none`
470 and `bpfeb-unknown-none`.][79608]
471 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
473 \* Refer to Rust's [platform support page][platform-support-doc] for more
474 information on Rust's tiered platform support.
477 -----------------------
479 - [`panic::panic_any` will now `#[track_caller]`.][85745]
480 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
481 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
482 - [The implementations of vendor intrinsics in core::arch have been
483 significantly refactored.][83278] The main user-visible changes are
484 a 50% reduction in the size of libcore.rlib and stricter validation
485 of constant operands passed to intrinsics. The latter is technically
486 a breaking change, but allows Rust to more closely match the C vendor
492 - [`BTreeMap::into_keys`]
493 - [`BTreeMap::into_values`]
494 - [`HashMap::into_keys`]
495 - [`HashMap::into_values`]
497 - [`VecDeque::binary_search`]
498 - [`VecDeque::binary_search_by`]
499 - [`VecDeque::binary_search_by_key`]
500 - [`VecDeque::partition_point`]
505 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
506 the dependency graph.][cargo/9520]
507 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
508 in the tree ][cargo/9499]
509 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
510 macro dependencies.][cargo/9488]
511 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
512 This variable points to a directory that integration tests and benches
513 can use as a "scratchpad" for testing filesystem operations.
517 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
518 - [Previously unsound code is no longer permitted where different constructors in branches
519 could require different lifetimes.][85574]
520 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
521 than before and may reject some previously accepted code.
522 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
523 when compiled with `codegen-units = 1`.][86063]
525 [85574]: https://github.com/rust-lang/rust/issues/85574
526 [86831]: https://github.com/rust-lang/rust/issues/86831
527 [86063]: https://github.com/rust-lang/rust/issues/86063
528 [86831]: https://github.com/rust-lang/rust/issues/86831
529 [79608]: https://github.com/rust-lang/rust/pull/79608
530 [84988]: https://github.com/rust-lang/rust/pull/84988
531 [84701]: https://github.com/rust-lang/rust/pull/84701
532 [84072]: https://github.com/rust-lang/rust/pull/84072
533 [85745]: https://github.com/rust-lang/rust/pull/85745
534 [84744]: https://github.com/rust-lang/rust/pull/84744
535 [85078]: https://github.com/rust-lang/rust/pull/85078
536 [84717]: https://github.com/rust-lang/rust/pull/84717
537 [83800]: https://github.com/rust-lang/rust/pull/83800
538 [83366]: https://github.com/rust-lang/rust/pull/83366
539 [83278]: https://github.com/rust-lang/rust/pull/83278
540 [85292]: https://github.com/rust-lang/rust/pull/85292
541 [82834]: https://github.com/rust-lang/rust/pull/82834
542 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
543 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
544 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
545 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
546 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
547 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
548 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
549 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
550 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
551 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
552 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
554 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
556 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
558 Version 1.53.0 (2021-06-17)
559 ============================
562 -----------------------
563 - [You can now use unicode for identifiers.][83799] This allows multilingual
564 identifiers but still doesn't allow glyphs that are not considered characters
565 such as `◆` or `🦀`. More specifically you can now use any identifier that
566 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
567 is the same standard as languages like Python, however Rust uses NFC
568 normalization which may be different from other languages.
569 - [You can now specify "or patterns" inside pattern matches.][79278]
570 Previously you could only use `|` (OR) on complete patterns. E.g.
574 matches!(x, Some(1) | Some(2));
576 matches!(x, Some(1 | 2));
578 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
579 has the same semantics as the `:pat` matcher. This is to allow `:pat`
580 to change semantics to being a pattern fragment in a future edition.
583 -----------------------
584 - [Updated the minimum external LLVM version to LLVM 10.][83387]
585 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
586 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
588 \* Refer to Rust's [platform support page][platform-support-doc] for more
589 information on Rust's tiered platform support.
592 -----------------------
593 - [Abort messages will now forward to `android_set_abort_message` on
594 Android platforms when available.][81469]
595 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
596 - [Arrays of any length now implement `IntoIterator`.][84147]
597 Currently calling `.into_iter()` as a method on an array will
598 return `impl Iterator<Item=&T>`, but this may change in a
599 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
600 directly on arrays will provide `impl Iterator<Item=T>` as expected.
601 - [`leading_zeros`, and `trailing_zeros` are now available on all
602 `NonZero` integer types.][84082]
603 - [`{f32, f64}::from_str` now parse and print special values
604 (`NaN`, `-0`) according to IEEE 754.][78618]
605 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
606 - [Add the `BITS` associated constant to all numeric types.][82565]
610 - [`AtomicBool::fetch_update`]
611 - [`AtomicPtr::fetch_update`]
612 - [`BTreeMap::retain`]
613 - [`BTreeSet::retain`]
614 - [`BufReader::seek_relative`]
615 - [`DebugStruct::non_exhaustive`]
618 - [`Duration::is_zero`]
619 - [`Duration::saturating_add`]
620 - [`Duration::saturating_mul`]
621 - [`Duration::saturating_sub`]
622 - [`ErrorKind::Unsupported`]
624 - [`Ordering::is_eq`]
625 - [`Ordering::is_ge`]
626 - [`Ordering::is_gt`]
627 - [`Ordering::is_le`]
628 - [`Ordering::is_lt`]
629 - [`Ordering::is_ne`]
630 - [`OsStr::is_ascii`]
631 - [`OsStr::make_ascii_lowercase`]
632 - [`OsStr::make_ascii_uppercase`]
633 - [`OsStr::to_ascii_lowercase`]
634 - [`OsStr::to_ascii_uppercase`]
635 - [`Peekable::peek_mut`]
636 - [`Rc::decrement_strong_count`]
637 - [`Rc::increment_strong_count`]
638 - [`Vec::extend_from_within`]
639 - [`array::from_mut`]
640 - [`array::from_ref`]
641 - [`cmp::max_by_key`]
643 - [`cmp::min_by_key`]
645 - [`f32::is_subnormal`]
646 - [`f64::is_subnormal`]
649 -----------------------
650 - [Cargo now supports git repositories where the default `HEAD` branch is not
651 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
652 which can handle default branches correctly.
653 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
654 - [The `authors` field is no longer included in `Cargo.toml` for new
655 projects.][cargo/9282]
658 -----------------------
659 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
660 without hyperlinks.][81764]
664 - [Implement token-based handling of attributes during expansion][82608]
665 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
666 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
667 to confusion and potential security vulnerabilities and [is no
668 longer recommended][ietf6943].
669 - [The added `BITS` constant may conflict with external definitions.][85667]
670 In particular, this was known to be a problem in the `lexical-core` crate,
671 but they have published fixes for semantic versions 0.4 through 0.7. To
672 update this dependency alone, use `cargo update -p lexical-core`.
673 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
677 These changes provide no direct user facing benefits, but represent significant
678 improvements to the internals and overall performance of rustc and
681 - [Rework the `std::sys::windows::alloc` implementation.][83065]
682 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
683 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
684 - [Rework rustdoc const type][82873]
686 [85667]: https://github.com/rust-lang/rust/pull/85667
687 [83386]: https://github.com/rust-lang/rust/pull/83386
688 [82771]: https://github.com/rust-lang/rust/pull/82771
689 [84147]: https://github.com/rust-lang/rust/pull/84147
690 [84082]: https://github.com/rust-lang/rust/pull/84082
691 [83799]: https://github.com/rust-lang/rust/pull/83799
692 [83681]: https://github.com/rust-lang/rust/pull/83681
693 [83652]: https://github.com/rust-lang/rust/pull/83652
694 [83387]: https://github.com/rust-lang/rust/pull/83387
695 [82873]: https://github.com/rust-lang/rust/pull/82873
696 [82864]: https://github.com/rust-lang/rust/pull/82864
697 [82608]: https://github.com/rust-lang/rust/pull/82608
698 [82565]: https://github.com/rust-lang/rust/pull/82565
699 [80525]: https://github.com/rust-lang/rust/pull/80525
700 [79278]: https://github.com/rust-lang/rust/pull/79278
701 [78618]: https://github.com/rust-lang/rust/pull/78618
702 [77704]: https://github.com/rust-lang/rust/pull/77704
703 [83941]: https://github.com/rust-lang/rust/pull/83941
704 [83065]: https://github.com/rust-lang/rust/pull/83065
705 [81764]: https://github.com/rust-lang/rust/pull/81764
706 [81469]: https://github.com/rust-lang/rust/pull/81469
707 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
708 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
709 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
710 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
711 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
712 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
713 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
714 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
715 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
716 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
717 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
718 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
719 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
720 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
721 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
722 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
723 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
724 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
725 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
726 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
727 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
728 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
729 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
730 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
731 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
732 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
733 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
734 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
735 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
736 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
737 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
738 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
739 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
740 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
741 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
742 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
743 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
744 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
745 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
746 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
747 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
748 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
751 Version 1.52.1 (2021-05-10)
752 ============================
754 This release disables incremental compilation, unless the user has explicitly
755 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
757 This is due to the widespread, and frequently occuring, breakage encountered by
758 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
759 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
760 newly added incremental verification are still present in past stable versions,
761 and are not yet fixed on any channel. These bugs can lead to miscompilation of
764 These problems only affect incremental builds, so release builds with Cargo
765 should not be affected unless the user has explicitly opted into incremental.
766 Debug and check builds are affected.
768 See [84970] for more details.
770 [84970]: https://github.com/rust-lang/rust/issues/84970
772 Version 1.52.0 (2021-05-06)
773 ============================
777 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
778 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
779 is allowed by default, and may become a warning or hard error in a
781 - [You can now cast mutable references to arrays to a pointer of the same type as
786 - [Upgraded the default LLVM to LLVM 12.][81451]
788 Added tier 3\* support for the following targets.
790 - [`s390x-unknown-linux-musl`][82166]
791 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
792 - [`powerpc-unknown-openbsd`][82733]
794 \* Refer to Rust's [platform support page][platform-support-doc] for more
795 information on Rust's tiered platform support.
799 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
800 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
801 - [`Arc<impl Error>` now implements `error::Error`.][80553]
802 - [All integer division and remainder operations are now `const`.][80962]
806 - [`Arguments::as_str`]
808 - [`char::REPLACEMENT_CHARACTER`]
809 - [`char::UNICODE_VERSION`]
810 - [`char::decode_utf16`]
811 - [`char::from_digit`]
812 - [`char::from_u32_unchecked`]
814 - [`slice::partition_point`]
815 - [`str::rsplit_once`]
816 - [`str::split_once`]
818 The following previously stable APIs are now `const`.
821 - [`char::len_utf16`]
822 - [`char::to_ascii_uppercase`]
823 - [`char::to_ascii_lowercase`]
824 - [`char::eq_ignore_ascii_case`]
825 - [`u8::to_ascii_uppercase`]
826 - [`u8::to_ascii_lowercase`]
827 - [`u8::eq_ignore_ascii_case`]
831 - [Rustdoc lints are now treated as a tool lint, meaning that
832 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
833 Using the old style is still allowed, and will become a warning in
835 - [Rustdoc now supports argument files.][82261]
836 - [Rustdoc now generates smart punctuation for documentation.][79423]
837 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
845 - [You can now pass multiple filters to tests.][81356] E.g.
846 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
847 - [Rustup now distributes PDB symbols for the `std` library on Windows,
848 allowing you to see `std` symbols when debugging.][82218]
852 These changes provide no direct user facing benefits, but represent significant
853 improvements to the internals and overall performance of rustc and
856 - [Check the result cache before the DepGraph when ensuring queries][81855]
857 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
858 - [Only store a LocalDefId in some HIR nodes][81611]
859 - [Store HIR attributes in a side table][79519]
863 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
864 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
865 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
866 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
867 languages in code blocks.][78429]
868 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
869 - [Changes in how proc macros handle whitespace may lead to panics when used
870 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
871 - [Turn `#[derive]` into a regular macro attribute][79078]
873 [84136]: https://github.com/rust-lang/rust/issues/84136
874 [80763]: https://github.com/rust-lang/rust/pull/80763
875 [82166]: https://github.com/rust-lang/rust/pull/82166
876 [82121]: https://github.com/rust-lang/rust/pull/82121
877 [81879]: https://github.com/rust-lang/rust/pull/81879
878 [82261]: https://github.com/rust-lang/rust/pull/82261
879 [82218]: https://github.com/rust-lang/rust/pull/82218
880 [82216]: https://github.com/rust-lang/rust/pull/82216
881 [82202]: https://github.com/rust-lang/rust/pull/82202
882 [81855]: https://github.com/rust-lang/rust/pull/81855
883 [81766]: https://github.com/rust-lang/rust/pull/81766
884 [81744]: https://github.com/rust-lang/rust/pull/81744
885 [81611]: https://github.com/rust-lang/rust/pull/81611
886 [81479]: https://github.com/rust-lang/rust/pull/81479
887 [81451]: https://github.com/rust-lang/rust/pull/81451
888 [81356]: https://github.com/rust-lang/rust/pull/81356
889 [80962]: https://github.com/rust-lang/rust/pull/80962
890 [80553]: https://github.com/rust-lang/rust/pull/80553
891 [80527]: https://github.com/rust-lang/rust/pull/80527
892 [79519]: https://github.com/rust-lang/rust/pull/79519
893 [79423]: https://github.com/rust-lang/rust/pull/79423
894 [79208]: https://github.com/rust-lang/rust/pull/79208
895 [78429]: https://github.com/rust-lang/rust/pull/78429
896 [82733]: https://github.com/rust-lang/rust/pull/82733
897 [82594]: https://github.com/rust-lang/rust/pull/82594
898 [79078]: https://github.com/rust-lang/rust/pull/79078
899 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
900 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
901 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
902 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
903 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
904 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
905 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
906 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
907 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
908 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
909 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
910 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
911 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
912 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
913 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
914 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
915 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
916 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
917 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
918 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
919 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
920 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
922 Version 1.51.0 (2021-03-25)
923 ============================
927 - [You can now parameterize items such as functions, traits, and `struct`s by constant
928 values in addition to by types and lifetimes.][79135] Also known as "const generics"
929 E.g. you can now write the following. Note: Only values of primitive integers,
930 `bool`, or `char` types are currently permitted.
932 struct GenericArray<T, const LENGTH: usize> {
936 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
937 const fn last(&self) -> Option<&T> {
941 Some(&self.inner[LENGTH - 1])
951 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
952 This option controls whether debug information is split across multiple files
953 or packed into a single file. **Note** This option is unstable on other platforms.
954 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
955 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
956 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
957 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
959 \* Refer to Rust's [platform support page][platform-support-doc] for more
960 information on Rust's tiered platform support.
965 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
966 - [`str` now implements `AsMut<str>`.][80279]
967 - [`u64` and `u128` now implement `From<char>`.][79502]
968 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
969 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
970 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
971 - [`io::Empty` now implements `io::Seek`.][78044]
972 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
973 `T: ?Sized` types.][80764]
974 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
980 - [`Arc::decrement_strong_count`]
981 - [`Arc::increment_strong_count`]
982 - [`Once::call_once_force`]
983 - [`Peekable::next_if_eq`]
984 - [`Peekable::next_if`]
985 - [`Seek::stream_position`]
986 - [`array::IntoIter`]
987 - [`panic::panic_any`]
989 - [`ptr::addr_of_mut!`]
990 - [`slice::fill_with`]
991 - [`slice::split_inclusive_mut`]
992 - [`slice::split_inclusive`]
993 - [`slice::strip_prefix`]
994 - [`slice::strip_suffix`]
995 - [`str::split_inclusive`]
996 - [`sync::OnceState`]
998 - [`VecDeque::range`]
999 - [`VecDeque::range_mut`]
1003 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1004 codegen option.][cargo/9112]
1005 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1006 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1007 to avoid unifying features of dependencies where that unification could be unwanted.
1008 Such as using the same dependency with a `std` feature in a build scripts and
1009 proc-macros, while using the `no-std` feature in the final binary. See the
1010 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1015 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1016 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1017 documentation.][79642]
1019 Various improvements to intra-doc links:
1021 - [You can link to non-path primitives such as `slice`.][80181]
1022 - [You can link to associated items.][74489]
1023 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1027 - [You can now pass `--include-ignored` to tests (e.g. with
1028 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1033 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1034 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1036 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1037 for the distributed artifacts.][81521]
1038 - `armv5te-unknown-linux-gnueabi`
1039 - `sparc64-unknown-linux-gnu`
1040 - `thumbv7neon-unknown-linux-gnueabihf`
1041 - `armv7-unknown-linux-gnueabi`
1042 - `x86_64-unknown-linux-gnux32`
1043 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1048 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1050 [79135]: https://github.com/rust-lang/rust/pull/79135
1051 [74489]: https://github.com/rust-lang/rust/pull/74489
1052 [76934]: https://github.com/rust-lang/rust/pull/76934
1053 [79570]: https://github.com/rust-lang/rust/pull/79570
1054 [80181]: https://github.com/rust-lang/rust/pull/80181
1055 [79642]: https://github.com/rust-lang/rust/pull/79642
1056 [80945]: https://github.com/rust-lang/rust/pull/80945
1057 [80279]: https://github.com/rust-lang/rust/pull/80279
1058 [80053]: https://github.com/rust-lang/rust/pull/80053
1059 [79502]: https://github.com/rust-lang/rust/pull/79502
1060 [75180]: https://github.com/rust-lang/rust/pull/75180
1061 [79135]: https://github.com/rust-lang/rust/pull/79135
1062 [81521]: https://github.com/rust-lang/rust/pull/81521
1063 [80968]: https://github.com/rust-lang/rust/pull/80968
1064 [80959]: https://github.com/rust-lang/rust/pull/80959
1065 [80718]: https://github.com/rust-lang/rust/pull/80718
1066 [80653]: https://github.com/rust-lang/rust/pull/80653
1067 [80579]: https://github.com/rust-lang/rust/pull/80579
1068 [79998]: https://github.com/rust-lang/rust/pull/79998
1069 [78044]: https://github.com/rust-lang/rust/pull/78044
1070 [81455]: https://github.com/rust-lang/rust/pull/81455
1071 [80764]: https://github.com/rust-lang/rust/pull/80764
1072 [80749]: https://github.com/rust-lang/rust/pull/80749
1073 [80662]: https://github.com/rust-lang/rust/pull/80662
1074 [79134]: https://github.com/rust-lang/rust/pull/79134
1075 [80966]: https://github.com/rust-lang/rust/pull/80966
1076 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1077 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1078 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1079 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1080 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1081 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1082 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1083 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1084 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1085 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1086 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1087 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1088 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1089 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1090 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1091 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1092 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1093 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1094 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1095 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1096 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1097 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1098 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1100 Version 1.50.0 (2021-02-11)
1101 ============================
1104 -----------------------
1105 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1106 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1107 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1110 -----------------------
1111 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1112 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1113 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1114 - [Dropped support for all cloudabi targets.][78439]
1116 \* Refer to Rust's [platform support page][platform-support-doc] for more
1117 information on Rust's tiered platform support.
1120 -----------------------
1122 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1123 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1124 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1125 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1126 up the same amount of space as `File`.
1132 - [`btree_map::Entry::or_insert_with_key`]
1135 - [`hash_map::Entry::or_insert_with_key`]
1139 - [`UnsafeCell::get_mut`]
1141 The following previously stable methods are now `const`.
1143 - [`IpAddr::is_ipv4`]
1144 - [`IpAddr::is_ipv6`]
1145 - [`IpAddr::is_unspecified`]
1146 - [`IpAddr::is_loopback`]
1147 - [`IpAddr::is_multicast`]
1148 - [`Ipv4Addr::octets`]
1149 - [`Ipv4Addr::is_loopback`]
1150 - [`Ipv4Addr::is_private`]
1151 - [`Ipv4Addr::is_link_local`]
1152 - [`Ipv4Addr::is_multicast`]
1153 - [`Ipv4Addr::is_broadcast`]
1154 - [`Ipv4Addr::is_documentation`]
1155 - [`Ipv4Addr::to_ipv6_compatible`]
1156 - [`Ipv4Addr::to_ipv6_mapped`]
1157 - [`Ipv6Addr::segments`]
1158 - [`Ipv6Addr::is_unspecified`]
1159 - [`Ipv6Addr::is_loopback`]
1160 - [`Ipv6Addr::is_multicast`]
1161 - [`Ipv6Addr::to_ipv4`]
1164 - [`Layout::from_size_align`]
1165 - `pow` for all integer types.
1166 - `checked_pow` for all integer types.
1167 - `saturating_pow` for all integer types.
1168 - `wrapping_pow` for all integer types.
1169 - `next_power_of_two` for all unsigned integer types.
1170 - `checked_next_power_of_two` for all unsigned integer types.
1173 -----------------------
1175 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1176 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1177 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1178 contents of that directory for changes.][cargo/8973]
1179 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1184 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1185 - [Running tests will now print the total time taken to execute.][75752]
1190 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1191 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1192 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1193 unhygenic `macro_rules!` macros.][79472]
1194 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1195 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1196 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1197 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1198 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1199 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1201 [74989]: https://github.com/rust-lang/rust/pull/74989
1202 [79261]: https://github.com/rust-lang/rust/pull/79261
1203 [79896]: https://github.com/rust-lang/rust/pull/79896
1204 [79484]: https://github.com/rust-lang/rust/pull/79484
1205 [79472]: https://github.com/rust-lang/rust/pull/79472
1206 [79270]: https://github.com/rust-lang/rust/pull/79270
1207 [79003]: https://github.com/rust-lang/rust/pull/79003
1208 [78864]: https://github.com/rust-lang/rust/pull/78864
1209 [78636]: https://github.com/rust-lang/rust/pull/78636
1210 [78439]: https://github.com/rust-lang/rust/pull/78439
1211 [78343]: https://github.com/rust-lang/rust/pull/78343
1212 [78296]: https://github.com/rust-lang/rust/pull/78296
1213 [78068]: https://github.com/rust-lang/rust/pull/78068
1214 [75752]: https://github.com/rust-lang/rust/pull/75752
1215 [74699]: https://github.com/rust-lang/rust/pull/74699
1216 [78142]: https://github.com/rust-lang/rust/pull/78142
1217 [77484]: https://github.com/rust-lang/rust/pull/77484
1218 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1219 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1220 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1221 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1222 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1223 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1224 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1225 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1226 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1227 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1228 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1229 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1230 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1231 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1232 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1233 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1234 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1235 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1236 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1237 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1238 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1239 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1240 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1241 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1242 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1243 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1244 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1245 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1246 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1247 [`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
1248 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1249 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1250 [`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
1251 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1254 Version 1.49.0 (2020-12-31)
1255 ============================
1258 -----------------------
1260 - [Unions can now implement `Drop`, and you can now have a field in a union
1261 with `ManuallyDrop<T>`.][77547]
1262 - [You can now cast uninhabited enums to integers.][76199]
1263 - [You can now bind by reference and by move in patterns.][76119] This
1264 allows you to selectively borrow individual components of a type. E.g.
1272 let person = Person {
1273 name: String::from("Alice"),
1277 // `name` is moved out of person, but `age` is referenced.
1278 let Person { name, ref age } = person;
1279 println!("{} {}", name, age);
1283 -----------------------
1285 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1286 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1287 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1288 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1289 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1290 - [Output from threads spawned in tests is now captured.][78227]
1291 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1293 \* Refer to Rust's [platform support page][platform-support-doc] for more
1294 information on Rust's tiered platform support.
1297 -----------------------
1299 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1300 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1305 - [`slice::select_nth_unstable`]
1306 - [`slice::select_nth_unstable_by`]
1307 - [`slice::select_nth_unstable_by_key`]
1309 The following previously stable methods are now `const`.
1311 - [`Poll::is_ready`]
1312 - [`Poll::is_pending`]
1315 -----------------------
1316 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1317 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1318 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1319 variable will be set if the crate being built is one the user selected to build, either
1320 with `-p` or through defaults.
1321 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1327 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1328 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1329 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1330 Previously such invalid or unused attributes could be ignored.
1331 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1332 read [this post about the changes][rustdoc-ws-post] for more details.
1333 - [Trait bounds are no longer inferred for associated types.][79904]
1337 These changes provide no direct user facing benefits, but represent significant
1338 improvements to the internals and overall performance of rustc and
1341 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1342 Local Storage model.][78201]
1343 - [Calculate visibilities once in resolve.][78077]
1344 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1345 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1348 [75991]: https://github.com/rust-lang/rust/pull/75991
1349 [78951]: https://github.com/rust-lang/rust/pull/78951
1350 [78848]: https://github.com/rust-lang/rust/pull/78848
1351 [78746]: https://github.com/rust-lang/rust/pull/78746
1352 [78376]: https://github.com/rust-lang/rust/pull/78376
1353 [78228]: https://github.com/rust-lang/rust/pull/78228
1354 [78227]: https://github.com/rust-lang/rust/pull/78227
1355 [78201]: https://github.com/rust-lang/rust/pull/78201
1356 [78109]: https://github.com/rust-lang/rust/pull/78109
1357 [78077]: https://github.com/rust-lang/rust/pull/78077
1358 [77997]: https://github.com/rust-lang/rust/pull/77997
1359 [77703]: https://github.com/rust-lang/rust/pull/77703
1360 [77547]: https://github.com/rust-lang/rust/pull/77547
1361 [77015]: https://github.com/rust-lang/rust/pull/77015
1362 [76199]: https://github.com/rust-lang/rust/pull/76199
1363 [76119]: https://github.com/rust-lang/rust/pull/76119
1364 [75914]: https://github.com/rust-lang/rust/pull/75914
1365 [79004]: https://github.com/rust-lang/rust/pull/79004
1366 [78676]: https://github.com/rust-lang/rust/pull/78676
1367 [79904]: https://github.com/rust-lang/rust/issues/79904
1368 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1369 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1370 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1371 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1372 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1373 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1374 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1375 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1376 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1377 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1378 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1380 Version 1.48.0 (2020-11-19)
1381 ==========================
1386 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1387 is still rejected *semantically*, but can now be parsed by procedural macros.
1391 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1392 `rustc` whether to link its own C runtime and libraries or to rely on a external
1393 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1394 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1395 Note: If you're using cargo you must explicitly pass the `--target` flag.
1396 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1398 \* Refer to Rust's [platform support page][platform-support-doc] for more
1399 information on Rust's tiered platform support.
1403 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1404 and `&Stderr`.][76275]
1405 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1406 - [The `matches!` macro now supports having a trailing comma.][74880]
1407 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1408 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1412 - [`slice::as_ptr_range`]
1413 - [`slice::as_mut_ptr_range`]
1414 - [`VecDeque::make_contiguous`]
1415 - [`future::pending`]
1418 The following previously stable methods are now `const fn`'s:
1420 - [`Option::is_some`]
1421 - [`Option::is_none`]
1422 - [`Option::as_ref`]
1424 - [`Result::is_err`]
1425 - [`Result::as_ref`]
1426 - [`Ordering::reverse`]
1427 - [`Ordering::then`]
1434 - [You can now link to items in `rustdoc` using the intra-doc link
1435 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1436 a link to `std::future`'s documentation. See ["Linking to items by
1437 name"][intradoc-links] for more information.
1438 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1439 when searching through `rustdoc`'s UI.][75740]
1443 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1444 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1445 promoted to `'static` lifetime any more inside `const fn`s.
1446 - [Associated type bindings on trait objects are now verified to meet the bounds
1447 declared on the trait when checking that they implement the trait.][27675]
1448 - [When trait bounds on associated types or opaque types are ambiguous, the
1449 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1450 - [Fixed recursive nonterminals not being expanded in macros during
1451 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1452 correctly handling recursive nonterminal tokens.
1453 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1454 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1455 in places where they have no effect.][73461]
1456 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1457 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1458 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1459 disallow zero-initialization.][71274]
1460 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1461 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1462 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1463 see the [`catch_unwind`] documentation for further information.
1469 These changes provide no direct user facing benefits, but represent significant
1470 improvements to the internals and overall performance of rustc and
1473 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1474 You can continue building with `make` by setting `ninja=false` in
1476 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1477 - [Made `ensure_sufficient_stack()` non-generic][76680]
1479 [78143]: https://github.com/rust-lang/rust/issues/78143
1480 [76680]: https://github.com/rust-lang/rust/pull/76680/
1481 [76030]: https://github.com/rust-lang/rust/pull/76030/
1482 [70212]: https://github.com/rust-lang/rust/pull/70212/
1483 [27675]: https://github.com/rust-lang/rust/issues/27675/
1484 [54121]: https://github.com/rust-lang/rust/issues/54121/
1485 [71274]: https://github.com/rust-lang/rust/pull/71274/
1486 [77386]: https://github.com/rust-lang/rust/pull/77386/
1487 [77153]: https://github.com/rust-lang/rust/pull/77153/
1488 [77055]: https://github.com/rust-lang/rust/pull/77055/
1489 [76275]: https://github.com/rust-lang/rust/pull/76275/
1490 [76310]: https://github.com/rust-lang/rust/pull/76310/
1491 [76420]: https://github.com/rust-lang/rust/pull/76420/
1492 [76158]: https://github.com/rust-lang/rust/pull/76158/
1493 [75857]: https://github.com/rust-lang/rust/pull/75857/
1494 [75585]: https://github.com/rust-lang/rust/pull/75585/
1495 [75740]: https://github.com/rust-lang/rust/pull/75740/
1496 [75502]: https://github.com/rust-lang/rust/pull/75502/
1497 [74880]: https://github.com/rust-lang/rust/pull/74880/
1498 [74922]: https://github.com/rust-lang/rust/pull/74922/
1499 [74430]: https://github.com/rust-lang/rust/pull/74430/
1500 [74194]: https://github.com/rust-lang/rust/pull/74194/
1501 [73461]: https://github.com/rust-lang/rust/pull/73461/
1502 [73166]: https://github.com/rust-lang/rust/pull/73166/
1503 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1504 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1505 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1506 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1507 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1508 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1509 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1510 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1511 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1512 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1513 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1514 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1515 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1516 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1517 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1520 Version 1.47.0 (2020-10-08)
1521 ==========================
1525 - [Closures will now warn when not used.][74869]
1529 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1530 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1532 - [Upgraded to LLVM 11.][73526]
1533 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1534 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1535 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1537 \* Refer to Rust's [platform support page][platform-support-doc] for more
1538 information on Rust's tiered platform support.
1542 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1543 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1544 those of length less than 33.][74060]
1545 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1546 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1547 `PartialEq`, and `PartialOrd`.][73583]
1551 - [`Ident::new_raw`]
1552 - [`Range::is_empty`]
1553 - [`RangeInclusive::is_empty`]
1554 - [`Result::as_deref`]
1555 - [`Result::as_deref_mut`]
1557 - [`pointer::offset_from`]
1561 The following previously stable APIs have now been made const.
1563 - [The `new` method for all `NonZero` integers.][73858]
1564 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1565 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1566 methods for all integers.][73858]
1567 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1568 signed integers.][73858]
1569 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1570 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1571 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1572 `is_ascii_control` methods for `char` and `u8`.][73858]
1576 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1577 You can override this by setting the following in your `Cargo.toml`.
1579 [profile.release.build-override]
1582 - [`cargo-help` will now display man pages for commands rather just the
1583 `--help` text.][cargo/8456]
1584 - [`cargo-metadata` now emits a `test` field indicating if a target has
1585 tests enabled.][cargo/8478]
1586 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1587 - [`cargo-publish` will now use an alternative registry by default if it's the
1588 only registry specified in `package.publish`.][cargo/8571]
1592 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1593 type based search.][75366]
1594 - [Added the Ayu theme to rustdoc.][71237]
1598 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1599 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1600 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1601 help to preserve more span information.][73084] These changes may cause
1602 compiliation errors if your macro was unhygenic or didn't correctly handle
1604 - [Moved support for the CloudABI target to tier 3.][75568]
1605 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1606 - [Added the `rustc-docs` component.][75560] This allows you to install
1607 and read the documentation for the compiler internal APIs. (Currently only
1608 available for `x86_64-unknown-linux-gnu`.)
1613 - [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.
1615 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1616 [75048]: https://github.com/rust-lang/rust/pull/75048/
1617 [74163]: https://github.com/rust-lang/rust/pull/74163/
1618 [71237]: https://github.com/rust-lang/rust/pull/71237/
1619 [74869]: https://github.com/rust-lang/rust/pull/74869/
1620 [73858]: https://github.com/rust-lang/rust/pull/73858/
1621 [75716]: https://github.com/rust-lang/rust/pull/75716/
1622 [75908]: https://github.com/rust-lang/rust/pull/75908/
1623 [75516]: https://github.com/rust-lang/rust/pull/75516/
1624 [75560]: https://github.com/rust-lang/rust/pull/75560/
1625 [75568]: https://github.com/rust-lang/rust/pull/75568/
1626 [75366]: https://github.com/rust-lang/rust/pull/75366/
1627 [75204]: https://github.com/rust-lang/rust/pull/75204/
1628 [74650]: https://github.com/rust-lang/rust/pull/74650/
1629 [74419]: https://github.com/rust-lang/rust/pull/74419/
1630 [73964]: https://github.com/rust-lang/rust/pull/73964/
1631 [74021]: https://github.com/rust-lang/rust/pull/74021/
1632 [74060]: https://github.com/rust-lang/rust/pull/74060/
1633 [73893]: https://github.com/rust-lang/rust/pull/73893/
1634 [73526]: https://github.com/rust-lang/rust/pull/73526/
1635 [73583]: https://github.com/rust-lang/rust/pull/73583/
1636 [73084]: https://github.com/rust-lang/rust/pull/73084/
1637 [73197]: https://github.com/rust-lang/rust/pull/73197/
1638 [72488]: https://github.com/rust-lang/rust/pull/72488/
1639 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1640 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1641 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1642 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1643 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1644 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1645 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1646 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1647 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1648 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1649 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1650 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1651 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1652 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1653 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1656 Version 1.46.0 (2020-08-27)
1657 ==========================
1661 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1662 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1663 const functions.][73862]
1664 - [The `#[track_caller]` attribute can now be added to functions to use the
1665 function's caller's location information for panic messages.][72445]
1666 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1667 `x.0.0` over `(x.0).0`.
1668 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1669 You currently can't use `mem::transmute` in constant functions.
1673 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1674 - [Enabled static "Position Independent Executables" by default
1675 for `x86_64-unknown-linux-musl`.][70740]
1679 - [`mem::forget` is now a `const fn`.][73887]
1680 - [`String` now implements `From<char>`.][73466]
1681 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1682 integer types.][73032]
1683 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1684 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1685 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1686 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1687 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1688 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1693 - [`vec::Drain::as_slice`]
1697 Added a number of new environment variables that are now available when
1698 compiling your crate.
1700 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1701 the specific binary being compiled and the name of the crate.
1702 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1703 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1707 - [The target configuration option `abi_blacklist` has been renamed
1708 to `unsupported_abis`.][74150] The old name will still continue to work.
1709 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1710 This was previously accepted but will become a hard error in a future release.
1711 - [Rustc will fail to compile if you have a struct with
1712 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1714 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1715 ensure that spans have the correct information, and may cause breakage if you
1716 were relying on receiving spans with dummy information.
1717 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1718 a legacy installer that was replaced by a MSI installer a few years ago but
1719 was still being built.
1720 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1721 - [Rustc will no longer accept overlapping trait implementations that only
1722 differ in how the lifetime was bound.][72493]
1723 - [Rustc now correctly relates the lifetime of an existential associated
1724 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1725 you to pass a shorter lifetime than expected.
1726 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1727 The library will need to be installed for `rustc` to work, even though we
1728 expect it to be already available on most systems.
1729 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1731 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1732 exact output returned by rustc's pretty printing is an unstable
1733 implementation detail: we recommend any macro relying on it to switch to a
1734 more robust parsing system.
1736 [75453]: https://github.com/rust-lang/rust/issues/75453/
1737 [74820]: https://github.com/rust-lang/rust/issues/74820/
1738 [74420]: https://github.com/rust-lang/rust/issues/74420/
1739 [74109]: https://github.com/rust-lang/rust/pull/74109/
1740 [74150]: https://github.com/rust-lang/rust/pull/74150/
1741 [73862]: https://github.com/rust-lang/rust/pull/73862/
1742 [73887]: https://github.com/rust-lang/rust/pull/73887/
1743 [73466]: https://github.com/rust-lang/rust/pull/73466/
1744 [73516]: https://github.com/rust-lang/rust/pull/73516/
1745 [73293]: https://github.com/rust-lang/rust/pull/73293/
1746 [73007]: https://github.com/rust-lang/rust/pull/73007/
1747 [73032]: https://github.com/rust-lang/rust/pull/73032/
1748 [72920]: https://github.com/rust-lang/rust/pull/72920/
1749 [72569]: https://github.com/rust-lang/rust/pull/72569/
1750 [72583]: https://github.com/rust-lang/rust/pull/72583/
1751 [72584]: https://github.com/rust-lang/rust/pull/72584/
1752 [72717]: https://github.com/rust-lang/rust/pull/72717/
1753 [72437]: https://github.com/rust-lang/rust/pull/72437/
1754 [72445]: https://github.com/rust-lang/rust/pull/72445/
1755 [72486]: https://github.com/rust-lang/rust/pull/72486/
1756 [72493]: https://github.com/rust-lang/rust/pull/72493/
1757 [72331]: https://github.com/rust-lang/rust/pull/72331/
1758 [71896]: https://github.com/rust-lang/rust/pull/71896/
1759 [71660]: https://github.com/rust-lang/rust/pull/71660/
1760 [71322]: https://github.com/rust-lang/rust/pull/71322/
1761 [70740]: https://github.com/rust-lang/rust/pull/70740/
1762 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1763 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1764 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1765 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1766 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1769 Version 1.45.2 (2020-08-03)
1770 ==========================
1772 * [Fix bindings in tuple struct patterns][74954]
1773 * [Fix track_caller integration with trait objects][74784]
1775 [74954]: https://github.com/rust-lang/rust/issues/74954
1776 [74784]: https://github.com/rust-lang/rust/issues/74784
1779 Version 1.45.1 (2020-07-30)
1780 ==========================
1782 * [Fix const propagation with references.][73613]
1783 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1784 * [Avoid spurious implicit region bound.][74509]
1785 * [Install clippy on x.py install][74457]
1787 [73613]: https://github.com/rust-lang/rust/pull/73613
1788 [73078]: https://github.com/rust-lang/rust/issues/73078
1789 [74509]: https://github.com/rust-lang/rust/pull/74509
1790 [74457]: https://github.com/rust-lang/rust/pull/74457
1793 Version 1.45.0 (2020-07-16)
1794 ==========================
1798 - [Out of range float to int conversions using `as` has been defined as a saturating
1799 conversion.][71269] This was previously undefined behaviour, but you can use the
1800 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1801 may be desirable in rare performance sensitive situations.
1802 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1803 using `u64`.][70705]
1804 - [Function like procedural macros can now be used in expression, pattern, and statement
1805 positions.][68717] This means you can now use a function-like procedural macro
1806 anywhere you can use a declarative (`macro_rules!`) macro.
1810 - [You can now override individual target features through the `target-feature`
1811 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1812 equivalent to `-C target-feature=+avx2,+fma`.
1813 - [Added the `force-unwind-tables` flag.][69984] This option allows
1814 rustc to always generate unwind tables regardless of panic strategy.
1815 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1816 to include LLVM bitcode into generated `rlib`s (this is on by default).
1817 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1818 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1819 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1820 - [Upgraded to LLVM 10.][67759]
1822 \* Refer to Rust's [platform support page][platform-support-doc] for more
1823 information on Rust's tiered platform support.
1828 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1830 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1831 - [You can now use `char` with
1832 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1833 a range of codepoints.][72413] E.g.
1834 you can now write the following;
1836 for ch in 'a'..='z' {
1840 // Prints "abcdefghijklmnopqrstuvwxyz"
1842 - [`OsString` now implements `FromStr`.][71662]
1843 - [The `saturating_neg` method has been added to all signed integer primitive
1844 types, and the `saturating_abs` method has been added for all integer
1845 primitive types.][71886]
1846 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1847 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1849 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1850 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1851 integer types.][69813]
1852 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1853 integer types.][72324]
1854 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1859 - [`BTreeMap::remove_entry`]
1861 - [`rc::Weak::as_ptr`]
1862 - [`rc::Weak::from_raw`]
1863 - [`rc::Weak::into_raw`]
1864 - [`str::strip_prefix`]
1865 - [`str::strip_suffix`]
1866 - [`sync::Weak::as_ptr`]
1867 - [`sync::Weak::from_raw`]
1868 - [`sync::Weak::into_raw`]
1869 - [`char::UNICODE_VERSION`]
1870 - [`Span::resolved_at`]
1871 - [`Span::located_at`]
1872 - [`Span::mixed_site`]
1873 - [`unix::process::CommandExt::arg0`]
1878 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1883 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1884 `~~outdated information~~` becomes "~~outdated information~~".
1885 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1889 - [Trying to self initialize a static value (that is creating a value using
1890 itself) is unsound and now causes a compile error.][71140]
1891 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1892 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1893 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1894 previously undocumented and not intended for public use. Rustdoc still provides
1895 a non-zero exit code on errors.
1896 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1897 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1898 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1899 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1900 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1904 - [Make clippy a git subtree instead of a git submodule][70655]
1905 - [Unify the undo log of all snapshot types][69464]
1907 [71848]: https://github.com/rust-lang/rust/issues/71848/
1908 [73420]: https://github.com/rust-lang/rust/issues/73420/
1909 [72324]: https://github.com/rust-lang/rust/pull/72324/
1910 [71843]: https://github.com/rust-lang/rust/pull/71843/
1911 [71886]: https://github.com/rust-lang/rust/pull/71886/
1912 [72234]: https://github.com/rust-lang/rust/pull/72234/
1913 [72239]: https://github.com/rust-lang/rust/pull/72239/
1914 [72397]: https://github.com/rust-lang/rust/pull/72397/
1915 [72413]: https://github.com/rust-lang/rust/pull/72413/
1916 [72014]: https://github.com/rust-lang/rust/pull/72014/
1917 [72062]: https://github.com/rust-lang/rust/pull/72062/
1918 [72094]: https://github.com/rust-lang/rust/pull/72094/
1919 [72133]: https://github.com/rust-lang/rust/pull/72133/
1920 [67759]: https://github.com/rust-lang/rust/pull/67759/
1921 [71900]: https://github.com/rust-lang/rust/pull/71900/
1922 [71928]: https://github.com/rust-lang/rust/pull/71928/
1923 [71662]: https://github.com/rust-lang/rust/pull/71662/
1924 [71716]: https://github.com/rust-lang/rust/pull/71716/
1925 [71447]: https://github.com/rust-lang/rust/pull/71447/
1926 [71269]: https://github.com/rust-lang/rust/pull/71269/
1927 [71095]: https://github.com/rust-lang/rust/pull/71095/
1928 [71140]: https://github.com/rust-lang/rust/pull/71140/
1929 [70655]: https://github.com/rust-lang/rust/pull/70655/
1930 [70705]: https://github.com/rust-lang/rust/pull/70705/
1931 [69984]: https://github.com/rust-lang/rust/pull/69984/
1932 [69813]: https://github.com/rust-lang/rust/pull/69813/
1933 [69464]: https://github.com/rust-lang/rust/pull/69464/
1934 [68717]: https://github.com/rust-lang/rust/pull/68717/
1935 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1936 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1937 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1938 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1939 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1940 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1941 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1942 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1943 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1944 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1945 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1946 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1947 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1948 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1949 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1950 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1951 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1954 Version 1.44.1 (2020-06-18)
1955 ===========================
1957 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1958 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1959 * [Fix crashes when finding backtrace on macOS.][71397]
1960 * [Clippy applies lint levels into different files.][clippy/5356]
1962 [71397]: https://github.com/rust-lang/rust/issues/71397
1963 [73078]: https://github.com/rust-lang/rust/issues/73078
1964 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1965 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1968 Version 1.44.0 (2020-06-04)
1969 ==========================
1973 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1974 - [Added the `unused_braces` lint.][70081]
1976 **Syntax-only changes**
1978 - [Expansion-driven outline module parsing][69838]
1983 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1988 These are still rejected semantically, so you will likely receive an error but
1989 these changes can be seen and parsed by macros and conditional compilation.
1993 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1994 Additionally when in incremental mode rustc defaults to 256 codegen units.
1995 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1996 a panic is thrown.][67502]
1997 - [Added tier 3\* support for the `aarch64-unknown-none` and
1998 `aarch64-unknown-none-softfloat` targets.][68334]
1999 - [Added tier 3 support for `arm64-apple-tvos` and
2000 `x86_64-apple-tvos` targets.][68191]
2005 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2006 `vec![]` to be able to be used in `const` contexts.
2007 - [`convert::Infallible` now implements `Hash`.][70281]
2008 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2009 a `&mut OsStr`.][70048]
2010 - [Unicode 13 is now supported.][69929]
2011 - [`String` now implements `From<&mut str>`.][69661]
2012 - [`IoSlice` now implements `Copy`.][69403]
2013 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2014 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2015 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2016 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2017 integer types.][69373]
2021 - [`PathBuf::with_capacity`]
2022 - [`PathBuf::capacity`]
2023 - [`PathBuf::clear`]
2024 - [`PathBuf::reserve`]
2025 - [`PathBuf::reserve_exact`]
2026 - [`PathBuf::shrink_to_fit`]
2027 - [`f32::to_int_unchecked`]
2028 - [`f64::to_int_unchecked`]
2029 - [`Layout::align_to`]
2030 - [`Layout::pad_to_align`]
2032 - [`Layout::extend`]
2036 - [Added the `cargo tree` command which will print a tree graph of
2037 your dependencies.][cargo/8062] E.g.
2039 mdbook v0.3.2 (/Users/src/rust/mdbook)
2041 │ ├── html5ever v0.24.0
2043 │ │ │ └── cfg-if v0.1.9
2045 │ │ └── markup5ever v0.9.0
2046 │ │ ├── log v0.4.8 (*)
2048 │ │ │ └── phf_shared v0.7.24
2049 │ │ │ ├── siphasher v0.2.3
2050 │ │ │ └── unicase v1.4.2
2051 │ │ │ [build-dependencies]
2052 │ │ │ └── version_check v0.1.5
2055 You can also display dependencies on multiple versions of the same crate with
2056 `cargo tree -d` (short for `cargo tree --duplicates`).
2060 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2061 the version in the sidebar.][69494]
2065 - [Rustc now correctly generates static libraries on Windows GNU targets with
2066 the `.a` extension, rather than the previous `.lib`.][70937]
2067 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2068 - [The `file_name` property in JSON output of macro errors now points the actual
2069 source file rather than the previous format of `<NAME macros>`.][70969]
2070 **Note:** this may not point to a file that actually exists on the user's system.
2071 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2072 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2073 not allow zero initialization such as `NonZeroU8`.][66059] This was
2074 previously a warning.
2075 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2076 operator has been defined as a saturating operation.][71269] This was previously
2077 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2078 continue using the current behaviour, which may be desirable in rare performance
2079 sensitive situations.
2083 These changes provide no direct user facing benefits, but represent significant
2084 improvements to the internals and overall performance of rustc and
2087 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2088 - [Replace big JS dict with JSON parsing.][71250]
2090 [69373]: https://github.com/rust-lang/rust/pull/69373/
2091 [66059]: https://github.com/rust-lang/rust/pull/66059/
2092 [68191]: https://github.com/rust-lang/rust/pull/68191/
2093 [68899]: https://github.com/rust-lang/rust/pull/68899/
2094 [71147]: https://github.com/rust-lang/rust/pull/71147/
2095 [71250]: https://github.com/rust-lang/rust/pull/71250/
2096 [70937]: https://github.com/rust-lang/rust/pull/70937/
2097 [70969]: https://github.com/rust-lang/rust/pull/70969/
2098 [70632]: https://github.com/rust-lang/rust/pull/70632/
2099 [70281]: https://github.com/rust-lang/rust/pull/70281/
2100 [70345]: https://github.com/rust-lang/rust/pull/70345/
2101 [70048]: https://github.com/rust-lang/rust/pull/70048/
2102 [70081]: https://github.com/rust-lang/rust/pull/70081/
2103 [70156]: https://github.com/rust-lang/rust/pull/70156/
2104 [71269]: https://github.com/rust-lang/rust/pull/71269/
2105 [69838]: https://github.com/rust-lang/rust/pull/69838/
2106 [69929]: https://github.com/rust-lang/rust/pull/69929/
2107 [69661]: https://github.com/rust-lang/rust/pull/69661/
2108 [69778]: https://github.com/rust-lang/rust/pull/69778/
2109 [69494]: https://github.com/rust-lang/rust/pull/69494/
2110 [69403]: https://github.com/rust-lang/rust/pull/69403/
2111 [69033]: https://github.com/rust-lang/rust/pull/69033/
2112 [68692]: https://github.com/rust-lang/rust/pull/68692/
2113 [68334]: https://github.com/rust-lang/rust/pull/68334/
2114 [67502]: https://github.com/rust-lang/rust/pull/67502/
2115 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2116 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2117 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2118 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2119 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2120 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2121 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2122 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2123 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2124 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2125 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2126 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2127 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2130 Version 1.43.1 (2020-05-07)
2131 ===========================
2133 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2134 * [Fixed the stabilization of AVX-512 features.][71473]
2135 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2137 [71430]: https://github.com/rust-lang/rust/pull/71430
2138 [71473]: https://github.com/rust-lang/rust/issues/71473
2139 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2142 Version 1.43.0 (2020-04-23)
2143 ==========================
2147 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2148 the type inferred correctly.][68129]
2149 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2151 **Syntax only changes**
2152 - [Allow `type Foo: Ord` syntactically.][69361]
2153 - [Fuse associated and extern items up to defaultness.][69194]
2154 - [Syntactically allow `self` in all `fn` contexts.][68764]
2155 - [Merge `fn` syntax + cleanup item parsing.][68728]
2156 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2157 For example, you may now write:
2159 macro_rules! mac_trait {
2169 These are still rejected *semantically*, so you will likely receive an error but
2170 these changes can be seen and parsed by macros and
2171 conditional compilation.
2176 - [You can now pass multiple lint flags to rustc to override the previous
2177 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2178 everything in the `unused` lint group except `unused-variables` which
2179 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2180 everything in the `unused` lint group **including** `unused-variables` since
2181 the allow flag is specified before the deny flag (and therefore overridden).
2182 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2183 if they are available on `windows-gnu`.][67429]
2184 - [rustc now buffers errors/warnings printed in JSON.][69227]
2188 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2189 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2190 respectively.][69538] **Note** These conversions are only available when `N`
2192 - [You can now use associated constants on floats and integers directly, rather
2193 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2194 `f32::NAN` with no imports.
2195 - [`u8::is_ascii` is now `const`.][68984]
2196 - [`String` now implements `AsMut<str>`.][68742]
2197 - [Added the `primitive` module to `std` and `core`.][67637] This module
2198 reexports Rust's primitive types. This is mainly useful in macros
2199 where you want avoid these types being shadowed.
2200 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2201 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2205 - [`Once::is_completed`]
2210 - [`iter::once_with`]
2214 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2215 your environment.][cargo/7823]
2216 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2217 executable path when running integration tests or benchmarks.][cargo/7697]
2218 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2219 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2223 - [Certain checks in the `const_err` lint were deemed unrelated to const
2224 evaluation][69185], and have been moved to the `unconditional_panic` and
2225 `arithmetic_overflow` lints.
2230 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2231 has been a warning since 1.36.0.
2232 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2233 led to some instances being accepted, and now correctly emits a hard error.
2235 [69340]: https://github.com/rust-lang/rust/pull/69340
2239 These changes provide no direct user facing benefits, but represent significant
2240 improvements to the internals and overall performance of `rustc` and
2243 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2244 - [Improved how rustc generates drop code.][67332]
2245 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2246 - [traits: preallocate 2 Vecs of known initial size][69022]
2247 - [Avoid exponential behaviour when relating types][68772]
2248 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2249 - [Improve performance of coherence checks][68966]
2250 - [Deduplicate types in the generator witness][68672]
2251 - [Invert control in struct_lint_level.][68725]
2253 [67332]: https://github.com/rust-lang/rust/pull/67332/
2254 [67429]: https://github.com/rust-lang/rust/pull/67429/
2255 [67637]: https://github.com/rust-lang/rust/pull/67637/
2256 [67642]: https://github.com/rust-lang/rust/pull/67642/
2257 [67878]: https://github.com/rust-lang/rust/pull/67878/
2258 [67885]: https://github.com/rust-lang/rust/pull/67885/
2259 [68129]: https://github.com/rust-lang/rust/pull/68129/
2260 [68672]: https://github.com/rust-lang/rust/pull/68672/
2261 [68725]: https://github.com/rust-lang/rust/pull/68725/
2262 [68728]: https://github.com/rust-lang/rust/pull/68728/
2263 [68738]: https://github.com/rust-lang/rust/pull/68738/
2264 [68742]: https://github.com/rust-lang/rust/pull/68742/
2265 [68764]: https://github.com/rust-lang/rust/pull/68764/
2266 [68772]: https://github.com/rust-lang/rust/pull/68772/
2267 [68943]: https://github.com/rust-lang/rust/pull/68943/
2268 [68952]: https://github.com/rust-lang/rust/pull/68952/
2269 [68966]: https://github.com/rust-lang/rust/pull/68966/
2270 [68984]: https://github.com/rust-lang/rust/pull/68984/
2271 [69022]: https://github.com/rust-lang/rust/pull/69022/
2272 [69185]: https://github.com/rust-lang/rust/pull/69185/
2273 [69194]: https://github.com/rust-lang/rust/pull/69194/
2274 [69201]: https://github.com/rust-lang/rust/pull/69201/
2275 [69227]: https://github.com/rust-lang/rust/pull/69227/
2276 [69548]: https://github.com/rust-lang/rust/pull/69548/
2277 [69256]: https://github.com/rust-lang/rust/pull/69256/
2278 [69361]: https://github.com/rust-lang/rust/pull/69361/
2279 [69366]: https://github.com/rust-lang/rust/pull/69366/
2280 [69538]: https://github.com/rust-lang/rust/pull/69538/
2281 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2282 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2283 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2284 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2285 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2286 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2287 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2288 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2291 Version 1.42.0 (2020-03-12)
2292 ==========================
2296 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2298 fn foo(words: &[&str]) {
2300 ["Hello", "World", "!", ..] => println!("Hello World!"),
2301 ["Foo", "Bar", ..] => println!("Baz"),
2302 rest => println!("{:?}", rest),
2306 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2307 that you can create an enum that has the exact layout and ABI of the type
2309 - [You can now use outer attribute procedural macros on inline modules.][64273]
2310 - [There are some *syntax-only* changes:][67131]
2311 - `default` is syntactically allowed before items in `trait` definitions.
2312 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2313 leave out their bodies in favor of `;`.
2314 - Bounds on associated types in `impl`s are now syntactically allowed
2315 (e.g. `type Foo: Ord;`).
2316 - `...` (the C-variadic type) may occur syntactically directly as the type of
2317 any function parameter.
2319 These are still rejected *semantically*, so you will likely receive an error
2320 but these changes can be seen and parsed by procedural macros and
2321 conditional compilation.
2325 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2326 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2327 - [`Option::{expect,unwrap}` and
2328 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2329 pointing to the location where they were called, rather than
2330 `core`'s internals. ][67887]
2332 \* Refer to Rust's [platform support page][platform-support-doc] for more
2333 information on Rust's tiered platform support.
2337 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2338 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2339 to implement `Sized`.][67935]
2340 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2341 - [`Layout::new` is now `const`.][66254]
2342 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2347 - [`CondVar::wait_while`]
2348 - [`CondVar::wait_timeout_while`]
2350 - [`DebugMap::value`]
2351 - [`ManuallyDrop::take`]
2353 - [`ptr::slice_from_raw_parts_mut`]
2354 - [`ptr::slice_from_raw_parts`]
2358 - [You no longer need to include `extern crate proc_macro;` to be able to
2359 `use proc_macro;` in the `2018` edition.][cargo/7700]
2363 - [`Error::description` has been deprecated, and its use will now produce a
2364 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2366 [68253]: https://github.com/rust-lang/rust/pull/68253/
2367 [68348]: https://github.com/rust-lang/rust/pull/68348/
2368 [67935]: https://github.com/rust-lang/rust/pull/67935/
2369 [68339]: https://github.com/rust-lang/rust/pull/68339/
2370 [68122]: https://github.com/rust-lang/rust/pull/68122/
2371 [64273]: https://github.com/rust-lang/rust/pull/64273/
2372 [67712]: https://github.com/rust-lang/rust/pull/67712/
2373 [67887]: https://github.com/rust-lang/rust/pull/67887/
2374 [67131]: https://github.com/rust-lang/rust/pull/67131/
2375 [67233]: https://github.com/rust-lang/rust/pull/67233/
2376 [66899]: https://github.com/rust-lang/rust/pull/66899/
2377 [66919]: https://github.com/rust-lang/rust/pull/66919/
2378 [66254]: https://github.com/rust-lang/rust/pull/66254/
2379 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2380 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2381 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2382 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2383 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2384 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2385 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2386 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2387 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2390 Version 1.41.1 (2020-02-27)
2391 ===========================
2393 * [Always check types of static items][69145]
2394 * [Always check lifetime bounds of `Copy` impls][69145]
2395 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2397 [69225]: https://github.com/rust-lang/rust/issues/69225
2398 [69145]: https://github.com/rust-lang/rust/pull/69145
2401 Version 1.41.0 (2020-01-30)
2402 ===========================
2407 - [You can now pass type parameters to foreign items when implementing
2408 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2409 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2410 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2411 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2412 - [You can now use any valid identifier in a `format_args` macro.][66847]
2413 Previously identifiers starting with an underscore were not allowed.
2414 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2415 enum variants.][66183] These are still rejected semantically, but
2416 can be seen and parsed by procedural macros and conditional compilation.
2421 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2422 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2423 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2424 - [You can now pass an arguments file passing the `@path` syntax
2425 to rustc.][66172] Note that the format differs somewhat from what is
2426 found in other tooling; please see [the documentation][argfile-docs] for
2428 - [You can now provide `--extern` flag without a path, indicating that it is
2429 available from the search path or specified with an `-L` flag.][64882]
2431 \* Refer to Rust's [platform support page][platform-support-doc] for more
2432 information on Rust's tiered platform support.
2434 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2439 - [The `core::panic` module is now stable.][66771] It was already stable
2441 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2442 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2443 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2448 - [`Result::map_or`]
2449 - [`Result::map_or_else`]
2450 - [`std::rc::Weak::weak_count`]
2451 - [`std::rc::Weak::strong_count`]
2452 - [`std::sync::Weak::weak_count`]
2453 - [`std::sync::Weak::strong_count`]
2458 - [Cargo will now document all the private items for binary crates
2459 by default.][cargo/7593]
2460 - [`cargo-install` will now reinstall the package if it detects that it is out
2461 of date.][cargo/7560]
2462 - [Cargo.lock now uses a more git friendly format that should help to reduce
2463 merge conflicts.][cargo/7579]
2464 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2465 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2466 optimisation level to `2` for debug builds. You can also use
2467 `[profile.<profile>.build-override]` to override build scripts and
2473 - [You can now specify `edition` in documentation code blocks to compile the block
2474 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2475 should be compiled the 2018 edition of Rust.
2476 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2477 current theme with `--check-theme`.][54733]
2478 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2483 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2484 Apple targets.][apple-32bit-drop] This means that the source code is still
2485 available to build, but the targets are no longer being tested and release
2486 binaries for those platforms will no longer be distributed by the Rust project.
2487 Please refer to the linked blog post for more information.
2489 [54733]: https://github.com/rust-lang/rust/pull/54733/
2490 [61351]: https://github.com/rust-lang/rust/pull/61351/
2491 [67255]: https://github.com/rust-lang/rust/pull/67255/
2492 [66661]: https://github.com/rust-lang/rust/pull/66661/
2493 [66771]: https://github.com/rust-lang/rust/pull/66771/
2494 [66847]: https://github.com/rust-lang/rust/pull/66847/
2495 [66238]: https://github.com/rust-lang/rust/pull/66238/
2496 [66277]: https://github.com/rust-lang/rust/pull/66277/
2497 [66325]: https://github.com/rust-lang/rust/pull/66325/
2498 [66172]: https://github.com/rust-lang/rust/pull/66172/
2499 [66183]: https://github.com/rust-lang/rust/pull/66183/
2500 [65879]: https://github.com/rust-lang/rust/pull/65879/
2501 [65013]: https://github.com/rust-lang/rust/pull/65013/
2502 [64882]: https://github.com/rust-lang/rust/pull/64882/
2503 [64325]: https://github.com/rust-lang/rust/pull/64325/
2504 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2505 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2506 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2507 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2508 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2509 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2510 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2511 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2512 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2513 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2514 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2516 Version 1.40.0 (2019-12-19)
2517 ===========================
2521 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2522 `const` contexts.][65188] e.g.
2525 pub struct Point(i32, i32);
2527 const ORIGIN: Point = {
2528 let constructor = Point;
2534 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2535 indicate that there may be variants or fields added in the future.][64639]
2536 For example this requires adding a wild-card branch (`_ => {}`) to any match
2537 statements on a non-exhaustive `enum`. [(RFC 2008)]
2538 - [You can now use function-like procedural macros in `extern` blocks and in
2539 type positions.][63931] e.g. `type Generated = macro!();`
2540 - [Function-like and attribute procedural macros can now emit
2541 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2542 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2543 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2544 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2548 - [Added tier 3 support\* for the
2549 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2550 - [Added tier 3 support for the
2551 `aarch64-unknown-none-softfloat` target.][64589]
2552 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2553 `mips64el-unknown-linux-muslabi64` targets.][65843]
2555 \* Refer to Rust's [platform support page][platform-support-doc] for more
2556 information on Rust's tiered platform support.
2560 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2564 - [`BTreeMap::get_key_value`]
2565 - [`HashMap::get_key_value`]
2566 - [`Option::as_deref_mut`]
2567 - [`Option::as_deref`]
2568 - [`Option::flatten`]
2569 - [`UdpSocket::peer_addr`]
2570 - [`f32::to_be_bytes`]
2571 - [`f32::to_le_bytes`]
2572 - [`f32::to_ne_bytes`]
2573 - [`f64::to_be_bytes`]
2574 - [`f64::to_le_bytes`]
2575 - [`f64::to_ne_bytes`]
2576 - [`f32::from_be_bytes`]
2577 - [`f32::from_le_bytes`]
2578 - [`f32::from_ne_bytes`]
2579 - [`f64::from_be_bytes`]
2580 - [`f64::from_le_bytes`]
2581 - [`f64::from_ne_bytes`]
2588 - [Cargo will now always display warnings, rather than only on
2589 fresh builds.][cargo/7450]
2590 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2591 now produce an error.][cargo/7507] Previously these flags were ignored.
2592 - [You can now publish `dev-dependencies` without including
2593 a `version`.][cargo/7333]
2597 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2598 when running documentation tests with `rustdoc`.][63803]
2602 - [As previously announced, any previous NLL warnings in the 2015 edition are
2603 now hard errors.][64221]
2604 - [The `include!` macro will now warn if it failed to include the
2605 entire file.][64284] The `include!` macro unintentionally only includes the
2606 first _expression_ in a file, and this can be unintuitive. This will become
2607 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2608 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2609 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2610 or `extern` blocks now correctly emits a hard error.
2612 [65294]: https://github.com/rust-lang/rust/pull/65294/
2613 [66103]: https://github.com/rust-lang/rust/pull/66103/
2614 [65843]: https://github.com/rust-lang/rust/pull/65843/
2615 [65188]: https://github.com/rust-lang/rust/pull/65188/
2616 [65092]: https://github.com/rust-lang/rust/pull/65092/
2617 [64589]: https://github.com/rust-lang/rust/pull/64589/
2618 [64639]: https://github.com/rust-lang/rust/pull/64639/
2619 [64221]: https://github.com/rust-lang/rust/pull/64221/
2620 [64284]: https://github.com/rust-lang/rust/pull/64284/
2621 [63931]: https://github.com/rust-lang/rust/pull/63931/
2622 [64035]: https://github.com/rust-lang/rust/pull/64035/
2623 [63674]: https://github.com/rust-lang/rust/pull/63674/
2624 [63803]: https://github.com/rust-lang/rust/pull/63803/
2625 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2626 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2627 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2628 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2629 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2630 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2631 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2632 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2633 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2634 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2635 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2636 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2637 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2638 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2639 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2640 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2641 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2642 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2643 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2644 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2645 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2646 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2647 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2648 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2649 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2650 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2653 Version 1.39.0 (2019-11-07)
2654 ===========================
2658 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2659 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2660 - [You can now use certain attributes on function, closure, and function pointer
2661 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2662 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2663 attributes applied to items. e.g.
2666 #[cfg(windows)] slice: &[u16],
2667 #[cfg(not(windows))] slice: &[u8],
2672 - [You can now take shared references to bind-by-move patterns in the `if` guards
2673 of `match` arms.][63118] e.g.
2676 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2680 // ---- `nums` is bound by move.
2681 if nums.iter().sum::<u8>() == 10
2682 // ^------ `.iter()` implicitly takes a reference to `nums`.
2685 // ----------- Legal as `nums` was bound by move and so we have ownership.
2687 _ => unreachable!(),
2696 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2697 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2698 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2699 **Note** Cargo currently doesn't use this feature. Refer to
2700 [cargo#7315][cargo/7315] to track this feature's progress.
2701 - [You can now pass `--show-output` argument to test binaries to print the
2702 output of successful tests.][62600]
2705 \* Refer to Rust's [platform support page][platform-support-doc] for more
2706 information on Rust's tiered platform support.
2710 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2711 - [`LinkedList::new` is now a `const` function.][63684]
2712 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2713 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2714 now `const`.][63786]
2718 - [`Pin::into_inner`]
2719 - [`Instant::checked_duration_since`]
2720 - [`Instant::saturating_duration_since`]
2724 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2725 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2726 `--all` is now deprecated.
2730 - [You can now pass `-Clinker` to rustdoc to control the linker used
2731 for compiling doctests.][63834]
2735 - [Code that was previously accepted by the old borrow checker, but rejected by
2736 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2737 previously a warning, and will also become a hard error in the Rust 2015
2738 edition in the 1.40.0 release.
2739 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2740 run tests.][63827] This should improve performance when running a large
2742 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2743 recommended to use the `?` operator instead.
2744 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2747 [62600]: https://github.com/rust-lang/rust/pull/62600/
2748 [62672]: https://github.com/rust-lang/rust/pull/62672/
2749 [63118]: https://github.com/rust-lang/rust/pull/63118/
2750 [63209]: https://github.com/rust-lang/rust/pull/63209/
2751 [63402]: https://github.com/rust-lang/rust/pull/63402/
2752 [63565]: https://github.com/rust-lang/rust/pull/63565/
2753 [63595]: https://github.com/rust-lang/rust/pull/63595/
2754 [63684]: https://github.com/rust-lang/rust/pull/63684/
2755 [63698]: https://github.com/rust-lang/rust/pull/63698/
2756 [63770]: https://github.com/rust-lang/rust/pull/63770/
2757 [63786]: https://github.com/rust-lang/rust/pull/63786/
2758 [63827]: https://github.com/rust-lang/rust/pull/63827/
2759 [63834]: https://github.com/rust-lang/rust/pull/63834/
2760 [63927]: https://github.com/rust-lang/rust/pull/63927/
2761 [63933]: https://github.com/rust-lang/rust/pull/63933/
2762 [63934]: https://github.com/rust-lang/rust/pull/63934/
2763 [63938]: https://github.com/rust-lang/rust/pull/63938/
2764 [63940]: https://github.com/rust-lang/rust/pull/63940/
2765 [63941]: https://github.com/rust-lang/rust/pull/63941/
2766 [63945]: https://github.com/rust-lang/rust/pull/63945/
2767 [64010]: https://github.com/rust-lang/rust/pull/64010/
2768 [64028]: https://github.com/rust-lang/rust/pull/64028/
2769 [64334]: https://github.com/rust-lang/rust/pull/64334/
2770 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2771 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2772 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2773 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2774 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2775 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2777 Version 1.38.0 (2019-09-26)
2778 ==========================
2782 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2783 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2787 - [Added pipelined compilation support to `rustc`.][62766] This will
2788 improve compilation times in some cases. For further information please refer
2789 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2790 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2791 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2792 `x86_64-uwp-windows-msvc` targets.][60260]
2793 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2794 `armv7-unknown-linux-musleabi` targets.][63107]
2795 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2796 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2797 - [Upgraded to LLVM 9.][62592]
2799 \* Refer to Rust's [platform support page][platform-support-doc] for more
2800 information on Rust's tiered platform support.
2804 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2805 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2806 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2807 is available at `std::clone::Clone`). This also makes all built-in macros
2808 available in `std`/`core` root. e.g. `std::include_bytes!`.
2809 - [`str::Chars` now implements `Debug`.][63000]
2810 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2811 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2812 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2813 - [Added euclidean remainder and division operations (`div_euclid`,
2814 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2815 `overflowing`, and `wrapping` versions are available for all
2817 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2818 `PartialEq`.][61491]
2819 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2823 - [`<*const T>::cast`]
2824 - [`<*mut T>::cast`]
2825 - [`Duration::as_secs_f32`]
2826 - [`Duration::as_secs_f64`]
2827 - [`Duration::div_f32`]
2828 - [`Duration::div_f64`]
2829 - [`Duration::from_secs_f32`]
2830 - [`Duration::from_secs_f64`]
2831 - [`Duration::mul_f32`]
2832 - [`Duration::mul_f64`]
2833 - [`any::type_name`]
2837 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2838 - [You can now pass the `--features` option multiple times to enable
2839 multiple features.][cargo/7084]
2844 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2848 - [`rustc` will now warn about some incorrect uses of
2849 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2853 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2855 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2856 issues][62896] with certain crates such as libc.
2858 [60260]: https://github.com/rust-lang/rust/pull/60260/
2859 [61457]: https://github.com/rust-lang/rust/pull/61457/
2860 [61491]: https://github.com/rust-lang/rust/pull/61491/
2861 [61884]: https://github.com/rust-lang/rust/pull/61884/
2862 [61953]: https://github.com/rust-lang/rust/pull/61953/
2863 [62042]: https://github.com/rust-lang/rust/pull/62042/
2864 [62528]: https://github.com/rust-lang/rust/pull/62528/
2865 [62583]: https://github.com/rust-lang/rust/pull/62583/
2866 [62735]: https://github.com/rust-lang/rust/pull/62735/
2867 [62766]: https://github.com/rust-lang/rust/pull/62766/
2868 [62784]: https://github.com/rust-lang/rust/pull/62784/
2869 [62592]: https://github.com/rust-lang/rust/pull/62592/
2870 [62785]: https://github.com/rust-lang/rust/issues/62785/
2871 [62814]: https://github.com/rust-lang/rust/pull/62814/
2872 [62896]: https://github.com/rust-lang/rust/issues/62896/
2873 [63000]: https://github.com/rust-lang/rust/pull/63000/
2874 [63056]: https://github.com/rust-lang/rust/pull/63056/
2875 [63107]: https://github.com/rust-lang/rust/pull/63107/
2876 [63346]: https://github.com/rust-lang/rust/pull/63346/
2877 [63421]: https://github.com/rust-lang/rust/pull/63421/
2878 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2879 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2880 [63048]: https://github.com/rust-lang/rust/pull/63048
2881 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2882 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2883 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2884 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2885 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2886 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2887 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2888 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2889 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2890 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2891 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2892 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2893 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2895 Version 1.37.0 (2019-08-15)
2896 ==========================
2900 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2901 [`Box`][62228], or an [array][62235] and unused.
2902 - [You can now use the `cfg` and `cfg_attr` attributes on
2903 generic parameters.][61547]
2904 - [You can now use enum variants through type alias.][61682] e.g. You can
2905 write the following:
2907 type MyOption = Option<u8>;
2909 fn increment_or_zero(x: MyOption) -> u8 {
2911 MyOption::Some(y) => y + 1,
2912 MyOption::None => 0,
2916 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2917 `const _: u32 = 5;`.
2918 - [You can now use `#[repr(align(X)]` on enums.][61229]
2919 - [The `?` Kleene macro operator is now available in the
2920 2015 edition.][60932]
2924 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2925 and `-C profile-use` flags.][61268] For more information on how to use profile
2926 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2927 - [The `rust-lldb` wrapper script should now work again.][61827]
2931 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2935 - [`BufReader::buffer`]
2936 - [`BufWriter::buffer`]
2937 - [`Cell::from_mut`]
2938 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2939 - [`DoubleEndedIterator::nth_back`]
2941 - [`Wrapping::reverse_bits`]
2942 - [`i128::reverse_bits`]
2943 - [`i16::reverse_bits`]
2944 - [`i32::reverse_bits`]
2945 - [`i64::reverse_bits`]
2946 - [`i8::reverse_bits`]
2947 - [`isize::reverse_bits`]
2948 - [`slice::copy_within`]
2949 - [`u128::reverse_bits`]
2950 - [`u16::reverse_bits`]
2951 - [`u32::reverse_bits`]
2952 - [`u64::reverse_bits`]
2953 - [`u8::reverse_bits`]
2954 - [`usize::reverse_bits`]
2958 - [`Cargo.lock` files are now included by default when publishing executable crates
2959 with executables.][cargo/7026]
2960 - [You can now specify `default-run="foo"` in `[package]` to specify the
2961 default executable to use for `cargo run`.][cargo/7056]
2968 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2969 Please transition your code to using the `..=` syntax for inclusive
2971 - [Using a trait object without the `dyn` will now warn by default.][61203]
2972 Please transition your code to use `dyn Trait` for trait objects instead.
2974 [62228]: https://github.com/rust-lang/rust/pull/62228/
2975 [62235]: https://github.com/rust-lang/rust/pull/62235/
2976 [61802]: https://github.com/rust-lang/rust/pull/61802/
2977 [61827]: https://github.com/rust-lang/rust/pull/61827/
2978 [61547]: https://github.com/rust-lang/rust/pull/61547/
2979 [61682]: https://github.com/rust-lang/rust/pull/61682/
2980 [61268]: https://github.com/rust-lang/rust/pull/61268/
2981 [61342]: https://github.com/rust-lang/rust/pull/61342/
2982 [61347]: https://github.com/rust-lang/rust/pull/61347/
2983 [61100]: https://github.com/rust-lang/rust/pull/61100/
2984 [61203]: https://github.com/rust-lang/rust/pull/61203/
2985 [61229]: https://github.com/rust-lang/rust/pull/61229/
2986 [60932]: https://github.com/rust-lang/rust/pull/60932/
2987 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2988 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2989 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2990 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2991 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2992 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2993 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2994 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2995 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2996 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2997 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2998 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2999 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3000 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3001 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3002 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3003 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3004 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3005 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3006 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3007 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3008 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3009 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3010 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3013 Version 1.36.0 (2019-07-04)
3014 ==========================
3018 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3019 - [The order of traits in trait objects no longer affects the semantics of that
3020 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3021 `dyn fmt::Debug + Send`, where this was previously not the case.
3025 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3026 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3027 - [`mem::needs_drop` is now available as a const fn.][60364]
3028 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3029 - [`String` now implements `BorrowMut<str>`.][60404]
3030 - [`io::Cursor` now implements `Default`.][60234]
3031 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3032 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3033 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3034 environment has access to heap memory allocation.
3035 - [`String` now implements `From<&String>`.][59825]
3036 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3037 return a tuple of each argument when there is multiple arguments.
3038 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3043 - [`VecDeque::rotate_left`]
3044 - [`VecDeque::rotate_right`]
3045 - [`Iterator::copied`]
3047 - [`io::IoSliceMut`]
3048 - [`Read::read_vectored`]
3049 - [`Write::write_vectored`]
3050 - [`str::as_mut_ptr`]
3051 - [`mem::MaybeUninit`]
3052 - [`pointer::align_offset`]
3053 - [`future::Future`]
3055 - [`task::RawWaker`]
3056 - [`task::RawWakerVTable`]
3062 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3063 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3065 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3069 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3076 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3077 longer recommended, and will be deprecated in 1.39.0.
3079 [60318]: https://github.com/rust-lang/rust/pull/60318/
3080 [60364]: https://github.com/rust-lang/rust/pull/60364/
3081 [60370]: https://github.com/rust-lang/rust/pull/60370/
3082 [60404]: https://github.com/rust-lang/rust/pull/60404/
3083 [60234]: https://github.com/rust-lang/rust/pull/60234/
3084 [60244]: https://github.com/rust-lang/rust/pull/60244/
3085 [58623]: https://github.com/rust-lang/rust/pull/58623/
3086 [59648]: https://github.com/rust-lang/rust/pull/59648/
3087 [59675]: https://github.com/rust-lang/rust/pull/59675/
3088 [59825]: https://github.com/rust-lang/rust/pull/59825/
3089 [59826]: https://github.com/rust-lang/rust/pull/59826/
3090 [59445]: https://github.com/rust-lang/rust/pull/59445/
3091 [59114]: https://github.com/rust-lang/rust/pull/59114/
3092 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3093 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3094 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3095 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3096 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3097 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3098 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3099 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3100 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3101 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3102 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3103 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3104 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3105 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3106 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3107 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3108 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3109 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3110 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3111 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3114 Version 1.35.0 (2019-05-23)
3115 ==========================
3119 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3120 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3121 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3123 unsafe fn call_unsafe(func: unsafe fn()) {
3128 unsafe { call_unsafe(|| {}); }
3135 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3136 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3137 - [Added the `wasm32-unknown-wasi` target.][59464]
3142 - [`Thread` will now show its ID in `Debug` output.][59460]
3143 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3144 - [`alloc::System` now implements `Default`.][59451]
3145 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3147 - [`char::{ToLowercase, ToUppercase}` now
3148 implement `ExactSizeIterator`.][58778]
3149 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3150 - [Removed the `Read` trait bounds
3151 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3152 - [You can now call the `dbg!` macro without any parameters to print the file
3153 and line where it is called.][57847]
3154 - [In place ASCII case conversions are now up to 4× faster.][59283]
3155 e.g. `str::make_ascii_lowercase`
3156 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3163 - [`RefCell::replace_with`]
3164 - [`RefCell::map_split`]
3166 - [`Range::contains`]
3167 - [`RangeFrom::contains`]
3168 - [`RangeTo::contains`]
3169 - [`RangeInclusive::contains`]
3170 - [`RangeToInclusive::contains`]
3171 - [`Option::copied`]
3175 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3176 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3181 - [The Rust toolchain is now available natively for musl based distros.][58575]
3183 [59460]: https://github.com/rust-lang/rust/pull/59460/
3184 [59464]: https://github.com/rust-lang/rust/pull/59464/
3185 [59500]: https://github.com/rust-lang/rust/pull/59500/
3186 [59512]: https://github.com/rust-lang/rust/pull/59512/
3187 [59580]: https://github.com/rust-lang/rust/pull/59580/
3188 [59283]: https://github.com/rust-lang/rust/pull/59283/
3189 [59451]: https://github.com/rust-lang/rust/pull/59451/
3190 [59076]: https://github.com/rust-lang/rust/pull/59076/
3191 [58778]: https://github.com/rust-lang/rust/pull/58778/
3192 [58717]: https://github.com/rust-lang/rust/pull/58717/
3193 [58369]: https://github.com/rust-lang/rust/pull/58369/
3194 [58423]: https://github.com/rust-lang/rust/pull/58423/
3195 [58080]: https://github.com/rust-lang/rust/pull/58080/
3196 [57847]: https://github.com/rust-lang/rust/pull/57847/
3197 [58575]: https://github.com/rust-lang/rust/pull/58575
3198 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3199 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3200 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3201 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3202 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3203 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3204 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3205 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3206 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3207 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3208 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3209 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3211 Version 1.34.2 (2019-05-14)
3212 ===========================
3214 * [Destabilize the `Error::type_id` function due to a security
3215 vulnerability][60785] ([CVE-2019-12083])
3217 [60785]: https://github.com/rust-lang/rust/pull/60785
3218 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3220 Version 1.34.1 (2019-04-25)
3221 ===========================
3223 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3224 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3225 * [Fix Clippy panic when checking some macros][clippy/3805]
3227 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3228 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3229 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3231 Version 1.34.0 (2019-04-11)
3232 ==========================
3236 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3237 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3239 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3240 `#[attr{}]` procedural macros.][57367]
3241 - [You can now write `extern crate self as foo;`][57407] to import your
3242 crate's root into the extern prelude.
3247 - [You can now target `riscv64imac-unknown-none-elf` and
3248 `riscv64gc-unknown-none-elf`.][58406]
3249 - [You can now enable linker plugin LTO optimisations with
3250 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3251 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3253 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3258 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3259 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3260 the `Hash` trait to create an iterator.
3261 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3262 methods.][58421] Most notably you no longer require the `Ord` trait to create
3264 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3265 for all numeric types.][58044]
3266 - [Indexing a `str` is now generic over all types that
3267 implement `SliceIndex<str>`.][57604]
3268 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3269 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3270 produce a warning if their returning type is unused.
3271 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3272 `overflowing_pow` are now available for all numeric types.][57873] These are
3273 equivalent to methods such as `wrapping_add` for the `pow` operation.
3281 * [`Error::type_id`]
3282 * [`atomic::AtomicI16`]
3283 * [`atomic::AtomicI32`]
3284 * [`atomic::AtomicI64`]
3285 * [`atomic::AtomicI8`]
3286 * [`atomic::AtomicU16`]
3287 * [`atomic::AtomicU32`]
3288 * [`atomic::AtomicU64`]
3289 * [`atomic::AtomicU8`]
3290 * [`convert::Infallible`]
3291 * [`convert::TryFrom`]
3292 * [`convert::TryInto`]
3294 * [`iter::successors`]
3295 * [`num::NonZeroI128`]
3296 * [`num::NonZeroI16`]
3297 * [`num::NonZeroI32`]
3298 * [`num::NonZeroI64`]
3299 * [`num::NonZeroI8`]
3300 * [`num::NonZeroIsize`]
3301 * [`slice::sort_by_cached_key`]
3302 * [`str::escape_debug`]
3303 * [`str::escape_default`]
3304 * [`str::escape_unicode`]
3305 * [`str::split_ascii_whitespace`]
3308 * [`Instant::checked_add`]
3309 * [`Instant::checked_sub`]
3310 * [`SystemTime::checked_add`]
3311 * [`SystemTime::checked_sub`]
3315 - [You can now use alternative registries to crates.io.][cargo/6654]
3319 - [You can now use the `?` operator in your documentation tests without manually
3320 adding `fn main() -> Result<(), _> {}`.][56470]
3324 - [`Command::before_exec` is being replaced by the unsafe method
3325 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3326 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3327 can now use `const` functions in `static` variables.
3329 [58370]: https://github.com/rust-lang/rust/pull/58370/
3330 [58406]: https://github.com/rust-lang/rust/pull/58406/
3331 [58421]: https://github.com/rust-lang/rust/pull/58421/
3332 [58166]: https://github.com/rust-lang/rust/pull/58166/
3333 [58044]: https://github.com/rust-lang/rust/pull/58044/
3334 [58057]: https://github.com/rust-lang/rust/pull/58057/
3335 [58059]: https://github.com/rust-lang/rust/pull/58059/
3336 [57809]: https://github.com/rust-lang/rust/pull/57809/
3337 [57873]: https://github.com/rust-lang/rust/pull/57873/
3338 [57604]: https://github.com/rust-lang/rust/pull/57604/
3339 [57367]: https://github.com/rust-lang/rust/pull/57367/
3340 [57407]: https://github.com/rust-lang/rust/pull/57407/
3341 [57425]: https://github.com/rust-lang/rust/pull/57425/
3342 [57106]: https://github.com/rust-lang/rust/pull/57106/
3343 [56470]: https://github.com/rust-lang/rust/pull/56470/
3344 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3345 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3346 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3347 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3348 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3349 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3350 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3351 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3352 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3353 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3354 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3355 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3356 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3357 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3358 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3359 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3360 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3361 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3362 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3363 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3364 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3365 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3366 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3367 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3368 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3369 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3370 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3371 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3372 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3373 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3374 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3377 Version 1.33.0 (2019-02-28)
3378 ==========================
3382 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3383 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3384 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3385 E.g. You can have match statement on a `u8` that covers `0..=255` and
3386 you would no longer be required to have a `_ => unreachable!()` case.
3387 - [You can now have multiple patterns in `if let` and `while let`
3388 expressions.][57532] You can do this with the same syntax as a `match`
3398 let state = Creature::Crab("Ferris");
3400 if let Creature::Crab(name) | Creature::Person(name) = state {
3401 println!("This creature's name is: {}", name);
3405 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3406 this feature will by default produce a warning as this behaviour can be
3407 unintuitive. E.g. `if let _ = 5 {}`
3408 - [You can now use `let` bindings, assignments, expression statements,
3409 and irrefutable pattern destructuring in const functions.][57175]
3410 - [You can now call unsafe const functions.][57067] E.g.
3412 const unsafe fn foo() -> i32 { 5 }
3413 const fn bar() -> i32 {
3417 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3418 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3419 - [You can now specify a specific alignment with the `#[repr(packed)]`
3420 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3421 with an alignment of 2 bytes and a size of 6 bytes.
3422 - [You can now import an item from a module as an `_`.][56303] This allows you to
3423 import a trait's impls, and not have the name in the namespace. E.g.
3425 use std::io::Read as _;
3427 // Allowed as there is only one `Read` in the module.
3430 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3434 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3435 command line argument.][56351]
3436 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3437 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3438 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3439 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3440 information on Rust's platform support.
3441 - [Added support for the `thumbv7neon-linux-androideabi` and
3442 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3443 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3447 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3448 functions for all numeric types.][57566]
3449 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3450 are now `const` functions for all numeric types.][57105]
3451 - [The methods `is_positive` and `is_negative` are now `const` functions for
3452 all signed numeric types.][57105]
3453 - [The `get` method for all `NonZero` types is now `const`.][57167]
3454 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3455 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3456 numeric types.][57234]
3457 - [`Ipv4Addr::new` is now a `const` function][57234]
3461 - [`unix::FileExt::read_exact_at`]
3462 - [`unix::FileExt::write_all_at`]
3463 - [`Option::transpose`]
3464 - [`Result::transpose`]
3465 - [`convert::identity`]
3468 - [`marker::PhantomPinned`]
3469 - [`Vec::resize_with`]
3470 - [`VecDeque::resize_with`]
3471 - [`Duration::as_millis`]
3472 - [`Duration::as_micros`]
3473 - [`Duration::as_nanos`]
3478 - [You can now publish crates that require a feature flag to compile with
3479 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3480 - [Cargo should now rebuild a crate if a file was modified during the initial
3485 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3486 are now deprecated in the standard library, and their usage will now produce a warning.
3487 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3489 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3491 - [Libtest no longer creates a new thread for each test when
3492 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3494 [55982]: https://github.com/rust-lang/rust/pull/55982/
3495 [56243]: https://github.com/rust-lang/rust/pull/56243
3496 [56303]: https://github.com/rust-lang/rust/pull/56303/
3497 [56351]: https://github.com/rust-lang/rust/pull/56351/
3498 [56362]: https://github.com/rust-lang/rust/pull/56362
3499 [56642]: https://github.com/rust-lang/rust/pull/56642/
3500 [56769]: https://github.com/rust-lang/rust/pull/56769/
3501 [56805]: https://github.com/rust-lang/rust/pull/56805
3502 [56947]: https://github.com/rust-lang/rust/pull/56947/
3503 [57049]: https://github.com/rust-lang/rust/pull/57049/
3504 [57067]: https://github.com/rust-lang/rust/pull/57067/
3505 [57105]: https://github.com/rust-lang/rust/pull/57105
3506 [57130]: https://github.com/rust-lang/rust/pull/57130/
3507 [57167]: https://github.com/rust-lang/rust/pull/57167/
3508 [57175]: https://github.com/rust-lang/rust/pull/57175/
3509 [57234]: https://github.com/rust-lang/rust/pull/57234/
3510 [57332]: https://github.com/rust-lang/rust/pull/57332/
3511 [57465]: https://github.com/rust-lang/rust/pull/57465/
3512 [57532]: https://github.com/rust-lang/rust/pull/57532/
3513 [57535]: https://github.com/rust-lang/rust/pull/57535/
3514 [57566]: https://github.com/rust-lang/rust/pull/57566/
3515 [57615]: https://github.com/rust-lang/rust/pull/57615/
3516 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3517 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3518 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3519 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3520 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3521 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3522 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3523 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3524 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3525 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3526 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3527 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3528 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3529 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3530 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3531 [platform-support]: https://forge.rust-lang.org/platform-support.html
3533 Version 1.32.0 (2019-01-17)
3534 ==========================
3539 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3540 operator allows you to specify zero or one repetitions similar to the `*` and
3542 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3543 now always resolve to the item (`enum`, `struct`, etc.) available in the
3544 module if present, before resolving to a external crate or an item the prelude.][56759]
3547 enum Color { Red, Green, Blue }
3553 - [You can now match against `PhantomData<T>` types.][55837]
3554 - [You can now match against literals in macros with the `literal`
3555 specifier.][56072] This will match against a literal of any type.
3556 E.g. `1`, `'A'`, `"Hello World"`
3557 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3559 struct Point(i32, i32);
3562 pub fn new(x: i32, y: i32) -> Self {
3566 pub fn is_origin(&self) -> bool {
3574 - [Self can also now be used in type definitions.][56366] E.g.
3578 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3581 Cons(T, Box<Self>) // likewise here
3584 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3585 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3589 - [The default allocator has changed from jemalloc to the default allocator on
3590 your system.][55238] The compiler itself on Linux & macOS will still use
3591 jemalloc, but programs compiled with it will use the system allocator.
3592 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3596 - [`PathBuf` now implements `FromStr`.][55148]
3597 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3598 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3599 easily debug expressions in your rust program. E.g.
3602 let b = dbg!(a * 2) + 1;
3603 // ^-- prints: [src/main.rs:4] a * 2 = 4
3607 The following APIs are now `const` functions and can be used in a
3611 - [`UnsafeCell::get`]
3612 - [`char::is_ascii`]
3614 - [`ManuallyDrop::new`]
3615 - [`ManuallyDrop::into_inner`]
3616 - [`RangeInclusive::start`]
3617 - [`RangeInclusive::end`]
3618 - [`NonNull::as_ptr`]
3621 - [`Duration::as_secs`]
3622 - [`Duration::subsec_millis`]
3623 - [`Duration::subsec_micros`]
3624 - [`Duration::subsec_nanos`]
3626 - [`Ipv4Addr::is_unspecified`]
3628 - [`Ipv6Addr::octets`]
3632 - [`i8::to_be_bytes`]
3633 - [`i8::to_le_bytes`]
3634 - [`i8::to_ne_bytes`]
3635 - [`i8::from_be_bytes`]
3636 - [`i8::from_le_bytes`]
3637 - [`i8::from_ne_bytes`]
3638 - [`i16::to_be_bytes`]
3639 - [`i16::to_le_bytes`]
3640 - [`i16::to_ne_bytes`]
3641 - [`i16::from_be_bytes`]
3642 - [`i16::from_le_bytes`]
3643 - [`i16::from_ne_bytes`]
3644 - [`i32::to_be_bytes`]
3645 - [`i32::to_le_bytes`]
3646 - [`i32::to_ne_bytes`]
3647 - [`i32::from_be_bytes`]
3648 - [`i32::from_le_bytes`]
3649 - [`i32::from_ne_bytes`]
3650 - [`i64::to_be_bytes`]
3651 - [`i64::to_le_bytes`]
3652 - [`i64::to_ne_bytes`]
3653 - [`i64::from_be_bytes`]
3654 - [`i64::from_le_bytes`]
3655 - [`i64::from_ne_bytes`]
3656 - [`i128::to_be_bytes`]
3657 - [`i128::to_le_bytes`]
3658 - [`i128::to_ne_bytes`]
3659 - [`i128::from_be_bytes`]
3660 - [`i128::from_le_bytes`]
3661 - [`i128::from_ne_bytes`]
3662 - [`isize::to_be_bytes`]
3663 - [`isize::to_le_bytes`]
3664 - [`isize::to_ne_bytes`]
3665 - [`isize::from_be_bytes`]
3666 - [`isize::from_le_bytes`]
3667 - [`isize::from_ne_bytes`]
3668 - [`u8::to_be_bytes`]
3669 - [`u8::to_le_bytes`]
3670 - [`u8::to_ne_bytes`]
3671 - [`u8::from_be_bytes`]
3672 - [`u8::from_le_bytes`]
3673 - [`u8::from_ne_bytes`]
3674 - [`u16::to_be_bytes`]
3675 - [`u16::to_le_bytes`]
3676 - [`u16::to_ne_bytes`]
3677 - [`u16::from_be_bytes`]
3678 - [`u16::from_le_bytes`]
3679 - [`u16::from_ne_bytes`]
3680 - [`u32::to_be_bytes`]
3681 - [`u32::to_le_bytes`]
3682 - [`u32::to_ne_bytes`]
3683 - [`u32::from_be_bytes`]
3684 - [`u32::from_le_bytes`]
3685 - [`u32::from_ne_bytes`]
3686 - [`u64::to_be_bytes`]
3687 - [`u64::to_le_bytes`]
3688 - [`u64::to_ne_bytes`]
3689 - [`u64::from_be_bytes`]
3690 - [`u64::from_le_bytes`]
3691 - [`u64::from_ne_bytes`]
3692 - [`u128::to_be_bytes`]
3693 - [`u128::to_le_bytes`]
3694 - [`u128::to_ne_bytes`]
3695 - [`u128::from_be_bytes`]
3696 - [`u128::from_le_bytes`]
3697 - [`u128::from_ne_bytes`]
3698 - [`usize::to_be_bytes`]
3699 - [`usize::to_le_bytes`]
3700 - [`usize::to_ne_bytes`]
3701 - [`usize::from_be_bytes`]
3702 - [`usize::from_le_bytes`]
3703 - [`usize::from_ne_bytes`]
3707 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3708 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3712 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3716 - [The argument types for AVX's
3717 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3718 been changed from `*const` to `*mut` as the previous implementation
3722 [55148]: https://github.com/rust-lang/rust/pull/55148/
3723 [55238]: https://github.com/rust-lang/rust/pull/55238/
3724 [55280]: https://github.com/rust-lang/rust/pull/55280/
3725 [55610]: https://github.com/rust-lang/rust/pull/55610/
3726 [55663]: https://github.com/rust-lang/rust/pull/55663/
3727 [55702]: https://github.com/rust-lang/rust/pull/55702/
3728 [55837]: https://github.com/rust-lang/rust/pull/55837/
3729 [55843]: https://github.com/rust-lang/rust/pull/55843/
3730 [56072]: https://github.com/rust-lang/rust/pull/56072/
3731 [56245]: https://github.com/rust-lang/rust/pull/56245/
3732 [56365]: https://github.com/rust-lang/rust/pull/56365/
3733 [56366]: https://github.com/rust-lang/rust/pull/56366/
3734 [56395]: https://github.com/rust-lang/rust/pull/56395/
3735 [56759]: https://github.com/rust-lang/rust/pull/56759/
3736 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3737 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3738 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3739 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3740 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3741 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3742 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3743 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3744 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3745 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3746 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3747 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3748 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3749 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3750 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3751 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3752 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3753 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3754 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3755 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3756 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3757 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3758 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3759 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3760 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3761 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3762 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3763 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3764 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3765 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3766 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3767 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3768 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3769 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3770 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3771 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3772 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3773 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3774 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3775 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3776 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3777 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3778 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3779 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3780 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3781 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3782 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3783 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3784 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3785 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3786 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3787 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3788 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3789 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3790 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3791 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3792 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3793 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3794 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3795 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3796 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3797 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3798 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3799 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3800 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3801 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3802 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3803 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3804 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3805 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3806 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3807 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3808 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3809 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3810 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3811 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3812 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3813 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3814 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3815 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3816 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3817 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3818 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3819 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3820 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3821 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3822 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3823 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3824 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3825 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3826 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3827 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3828 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3831 Version 1.31.1 (2018-12-20)
3832 ===========================
3834 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3835 - [Fix broken go-to-definition in RLS][rls/1171]
3836 - [Fix infinite loop on hover in RLS][rls/1170]
3838 [56562]: https://github.com/rust-lang/rust/pull/56562
3839 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3840 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3842 Version 1.31.0 (2018-12-06)
3843 ==========================
3847 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3848 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3849 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3850 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3852 - [You can now define and use `const` functions.][54835] These are currently
3853 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3854 [language reference][const-reference] for what exactly is available.
3855 - [You can now use tool lints, which allow you to scope lints from external
3856 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3857 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3858 a crate, not just in exported functions.][54451]
3859 - [You can now use parentheses in pattern matches.][54497]
3863 - [Updated musl to 1.1.20][54430]
3867 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3868 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3869 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3870 into `Option<&mut T>` using the `From` trait.][53218]
3871 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3876 - [`slice::align_to`]
3877 - [`slice::align_to_mut`]
3878 - [`slice::chunks_exact`]
3879 - [`slice::chunks_exact_mut`]
3880 - [`slice::rchunks`]
3881 - [`slice::rchunks_mut`]
3882 - [`slice::rchunks_exact`]
3883 - [`slice::rchunks_exact_mut`]
3884 - [`Option::replace`]
3888 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3889 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3890 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3892 [52813]: https://github.com/rust-lang/rust/pull/52813/
3893 [53218]: https://github.com/rust-lang/rust/pull/53218/
3894 [53555]: https://github.com/rust-lang/rust/issues/53555/
3895 [54057]: https://github.com/rust-lang/rust/pull/54057/
3896 [54240]: https://github.com/rust-lang/rust/pull/54240/
3897 [54430]: https://github.com/rust-lang/rust/pull/54430/
3898 [54451]: https://github.com/rust-lang/rust/pull/54451/
3899 [54497]: https://github.com/rust-lang/rust/pull/54497/
3900 [54778]: https://github.com/rust-lang/rust/pull/54778/
3901 [54835]: https://github.com/rust-lang/rust/pull/54835/
3902 [54870]: https://github.com/rust-lang/rust/pull/54870/
3903 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3904 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3905 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3906 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3907 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3908 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3909 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3910 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3911 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3912 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3913 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3914 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3915 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3916 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3918 Version 1.30.1 (2018-11-08)
3919 ===========================
3921 - [Fixed overflow ICE in rustdoc][54199]
3922 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3924 [54199]: https://github.com/rust-lang/rust/pull/54199
3925 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3927 Version 1.30.0 (2018-10-25)
3928 ==========================
3932 - [Procedural macros are now available.][52081] These kinds of macros allow for
3933 more powerful code generation. There is a [new chapter available][proc-macros]
3934 in the Rust Programming Language book that goes further in depth.
3935 - [You can now use keywords as identifiers using the raw identifiers
3936 syntax (`r#`),][53236] e.g. `let r#for = true;`
3937 - [Using anonymous parameters in traits is now deprecated with a warning and
3938 will be a hard error in the 2018 edition.][53272]
3939 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3940 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3941 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3942 Previously, using a external crate in a module without a use statement
3943 required `let json = ::serde_json::from_str(foo);` but can now be written
3944 as `let json = serde_json::from_str(foo);`.
3945 - [You can now apply the `#[used]` attribute to static items to prevent the
3946 compiler from optimising them away, even if they appear to be unused,][51363]
3947 e.g. `#[used] static FOO: u32 = 1;`
3948 - [You can now import and reexport macros from other crates with the `use`
3949 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3950 the root module of the crate. If your macro relies on calling other local
3951 macros, it is recommended to export with the
3952 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3954 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3955 using the `vis` specifier.][53370]
3956 - [Non-macro attributes now allow all forms of literals, not just
3957 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3958 write `#[attr(true)]`.
3959 - [You can now specify a function to handle a panic in the Rust runtime with the
3960 `#[panic_handler]` attribute.][51366]
3964 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3965 - [Added the `aarch64-unknown-netbsd` target][53165]
3966 - [Upgraded to LLVM 8.][53611]
3970 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3974 - [`Ipv4Addr::BROADCAST`]
3975 - [`Ipv4Addr::LOCALHOST`]
3976 - [`Ipv4Addr::UNSPECIFIED`]
3977 - [`Ipv6Addr::LOCALHOST`]
3978 - [`Ipv6Addr::UNSPECIFIED`]
3979 - [`Iterator::find_map`]
3981 The following methods are replacement methods for `trim_left`, `trim_right`,
3982 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3984 - [`str::trim_end_matches`]
3986 - [`str::trim_start_matches`]
3987 - [`str::trim_start`]
3991 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3992 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3993 equivalent to calling `rustdoc --error-format=json`.
3994 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3998 - [`rustdoc` allows you to specify what edition to treat your code as with the
3999 `--edition` option.][54057]
4000 - [`rustdoc` now has the `--color` (specify whether to output color) and
4001 `--error-format` (specify error format, e.g. `json`) options.][53003]
4002 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4003 debug symbols.][53774]
4004 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4005 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4007 [50911]: https://github.com/rust-lang/rust/pull/50911/
4008 [51363]: https://github.com/rust-lang/rust/pull/51363/
4009 [51366]: https://github.com/rust-lang/rust/pull/51366/
4010 [52081]: https://github.com/rust-lang/rust/pull/52081/
4011 [53003]: https://github.com/rust-lang/rust/pull/53003/
4012 [53033]: https://github.com/rust-lang/rust/pull/53033/
4013 [53044]: https://github.com/rust-lang/rust/pull/53044/
4014 [53165]: https://github.com/rust-lang/rust/pull/53165/
4015 [53611]: https://github.com/rust-lang/rust/pull/53611/
4016 [53213]: https://github.com/rust-lang/rust/pull/53213/
4017 [53236]: https://github.com/rust-lang/rust/pull/53236/
4018 [53272]: https://github.com/rust-lang/rust/pull/53272/
4019 [53370]: https://github.com/rust-lang/rust/pull/53370/
4020 [53459]: https://github.com/rust-lang/rust/pull/53459/
4021 [53774]: https://github.com/rust-lang/rust/pull/53774/
4022 [53822]: https://github.com/rust-lang/rust/pull/53822/
4023 [54057]: https://github.com/rust-lang/rust/pull/54057/
4024 [54146]: https://github.com/rust-lang/rust/pull/54146/
4025 [54404]: https://github.com/rust-lang/rust/pull/54404/
4026 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4027 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4028 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4029 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4031 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4032 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4033 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4034 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4035 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4036 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4037 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4038 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4039 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4040 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4043 Version 1.29.2 (2018-10-11)
4044 ===========================
4046 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4047 - The `rls-preview` component on the windows-gnu targets has been restored.
4049 [54639]: https://github.com/rust-lang/rust/pull/54639
4052 Version 1.29.1 (2018-09-25)
4053 ===========================
4058 - The standard library's `str::repeat` function contained an out of bounds write
4059 caused by an integer overflow. This has been fixed by deterministically
4060 panicking when an overflow happens.
4062 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4066 Version 1.29.0 (2018-09-13)
4067 ==========================
4071 - [Bumped minimum LLVM version to 5.0.][51899]
4072 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4073 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4074 - [Upgraded to LLVM 7.][51966]
4078 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4079 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4080 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4081 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4083 - [`Cell<T>` now allows `T` to be unsized.][50494]
4084 - [`SocketAddr` is now stable on Redox.][52656]
4089 - [`Iterator::flatten`]
4094 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4095 `--locked` to disable this behavior.
4096 - [`cargo-install` will now allow you to cross compile an install
4097 using `--target`.][cargo/5614]
4098 - [Added the `cargo-fix` subcommand to automatically move project code from
4099 2015 edition to 2018.][cargo/5723]
4100 - [`cargo doc` can now optionally document private types using the
4101 `--document-private-items` flag.][cargo/5543]
4105 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4106 the specified level to that level.][52354] For example `--cap-lints warn`
4107 will demote `deny` and `forbid` lints to `warn`.
4108 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4109 fails and `101` if there is a panic.][52197]
4110 - [A preview of clippy has been made available through rustup.][51122]
4111 You can install the preview with `rustup component add clippy-preview`.
4115 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4116 Use `str::get_unchecked(begin..end)` instead.
4117 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4118 Consider using the `home_dir` function from
4119 https://crates.io/crates/dirs instead.
4120 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4121 - [`cfg` attributes and `--cfg` command line flags are now more
4122 strictly validated.][53893]
4124 [53893]: https://github.com/rust-lang/rust/pull/53893/
4125 [52861]: https://github.com/rust-lang/rust/pull/52861/
4126 [51966]: https://github.com/rust-lang/rust/pull/51966/
4127 [52656]: https://github.com/rust-lang/rust/pull/52656/
4128 [52239]: https://github.com/rust-lang/rust/pull/52239/
4129 [52330]: https://github.com/rust-lang/rust/pull/52330/
4130 [52354]: https://github.com/rust-lang/rust/pull/52354/
4131 [52402]: https://github.com/rust-lang/rust/pull/52402/
4132 [52103]: https://github.com/rust-lang/rust/pull/52103/
4133 [52197]: https://github.com/rust-lang/rust/pull/52197/
4134 [51807]: https://github.com/rust-lang/rust/pull/51807/
4135 [51899]: https://github.com/rust-lang/rust/pull/51899/
4136 [51912]: https://github.com/rust-lang/rust/pull/51912/
4137 [51511]: https://github.com/rust-lang/rust/pull/51511/
4138 [51619]: https://github.com/rust-lang/rust/pull/51619/
4139 [51656]: https://github.com/rust-lang/rust/pull/51656/
4140 [51178]: https://github.com/rust-lang/rust/pull/51178/
4141 [51122]: https://github.com/rust-lang/rust/pull/51122
4142 [50494]: https://github.com/rust-lang/rust/pull/50494/
4143 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4144 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4145 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4146 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4147 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4148 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4149 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4152 Version 1.28.0 (2018-08-02)
4153 ===========================
4157 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4158 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4159 the inner type across Foreign Function Interface (FFI) boundaries.
4160 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4161 and can now be used as identifiers.][51196]
4162 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4163 stable.][51241] This will allow users to specify a global allocator for
4165 - [Unit test functions marked with the `#[test]` attribute can now return
4166 `Result<(), E: Debug>` in addition to `()`.][51298]
4167 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4168 allows macros to easily target lifetimes.
4172 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4173 prioritise making smaller binary sizes. `z` is the same as `s` with the
4174 exception that it does not vectorise loops, which typically results in an even
4176 - [The short error format is now stable.][49546] Specified with
4177 `--error-format=short` this option will provide a more compressed output of
4178 rust error messages.
4179 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4180 - [Reduced the number of allocations in the macro parser.][50855] This can
4181 improve compile times of macro heavy crates on average by 5%.
4185 - [Implemented `Default` for `&mut str`.][51306]
4186 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4187 - [Implemented `Extend` for `()`.][50234]
4188 - [The `Debug` implementation of `time::Duration` should now be more easily
4189 human readable.][50364] Previously a `Duration` of one second would printed as
4190 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4191 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4192 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4193 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4194 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4195 for `PathBuf`.][50170]
4196 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4197 and `Wrapping<i128>`.][50465]
4198 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4199 possible.][51050] This can provide up to a 40% speed increase.
4200 - [Improved error messages when using `format!`.][50610]
4204 - [`Iterator::step_by`]
4205 - [`Path::ancestors`]
4206 - [`SystemTime::UNIX_EPOCH`]
4207 - [`alloc::GlobalAlloc`]
4209 - [`alloc::LayoutErr`]
4212 - [`alloc::alloc_zeroed`]
4213 - [`alloc::dealloc`]
4214 - [`alloc::realloc`]
4215 - [`alloc::handle_alloc_error`]
4216 - [`btree_map::Entry::or_default`]
4217 - [`fmt::Alignment`]
4218 - [`hash_map::Entry::or_default`]
4219 - [`iter::repeat_with`]
4220 - [`num::NonZeroUsize`]
4221 - [`num::NonZeroU128`]
4222 - [`num::NonZeroU16`]
4223 - [`num::NonZeroU32`]
4224 - [`num::NonZeroU64`]
4225 - [`num::NonZeroU8`]
4226 - [`ops::RangeBounds`]
4227 - [`slice::SliceIndex`]
4228 - [`slice::from_mut`]
4229 - [`slice::from_ref`]
4230 - [`{Any + Send + Sync}::downcast_mut`]
4231 - [`{Any + Send + Sync}::downcast_ref`]
4232 - [`{Any + Send + Sync}::is`]
4236 - [Cargo will now no longer allow you to publish crates with build scripts that
4237 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4238 considered to be immutable.
4242 - [The `suggestion_applicability` field in `rustc`'s json output is now
4243 stable.][50486] This will allow dev tools to check whether a code suggestion
4244 would apply to them.
4248 - [Rust will consider trait objects with duplicated constraints to be the same
4249 type as without the duplicated constraint.][51276] For example the below code will
4250 now fail to compile.
4255 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4258 impl Trait + Send + Send {
4259 fn test(&self) { println!("two"); }
4263 [49546]: https://github.com/rust-lang/rust/pull/49546/
4264 [50143]: https://github.com/rust-lang/rust/pull/50143/
4265 [50170]: https://github.com/rust-lang/rust/pull/50170/
4266 [50234]: https://github.com/rust-lang/rust/pull/50234/
4267 [50265]: https://github.com/rust-lang/rust/pull/50265/
4268 [50364]: https://github.com/rust-lang/rust/pull/50364/
4269 [50385]: https://github.com/rust-lang/rust/pull/50385/
4270 [50465]: https://github.com/rust-lang/rust/pull/50465/
4271 [50486]: https://github.com/rust-lang/rust/pull/50486/
4272 [50554]: https://github.com/rust-lang/rust/pull/50554/
4273 [50610]: https://github.com/rust-lang/rust/pull/50610/
4274 [50855]: https://github.com/rust-lang/rust/pull/50855/
4275 [51050]: https://github.com/rust-lang/rust/pull/51050/
4276 [51196]: https://github.com/rust-lang/rust/pull/51196/
4277 [51200]: https://github.com/rust-lang/rust/pull/51200/
4278 [51241]: https://github.com/rust-lang/rust/pull/51241/
4279 [51276]: https://github.com/rust-lang/rust/pull/51276/
4280 [51298]: https://github.com/rust-lang/rust/pull/51298/
4281 [51306]: https://github.com/rust-lang/rust/pull/51306/
4282 [51562]: https://github.com/rust-lang/rust/pull/51562/
4283 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4284 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4285 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4286 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4287 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4288 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4289 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4290 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4291 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4292 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4293 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4294 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4295 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4296 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4297 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4298 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4299 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4300 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4301 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4302 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4303 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4304 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4305 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4306 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4307 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4308 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4309 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4310 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4311 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4312 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4314 Version 1.27.2 (2018-07-20)
4315 ===========================
4320 - The borrow checker was fixed to avoid potential unsoundness when using
4321 match ergonomics: [#52213][52213].
4323 [52213]: https://github.com/rust-lang/rust/issues/52213
4325 Version 1.27.1 (2018-07-10)
4326 ===========================
4331 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4332 when running, which enabled executing code as some other user on a
4333 given machine. This release fixes that vulnerability; you can read
4334 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4336 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4341 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4342 match ergonomics: [#51415][51415], [#49534][49534].
4344 [51415]: https://github.com/rust-lang/rust/issues/51415
4345 [49534]: https://github.com/rust-lang/rust/issues/49534
4346 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4347 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4349 Version 1.27.0 (2018-06-21)
4350 ==========================
4354 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4355 be used as an identifier.
4356 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4357 bare `Trait` syntax, and should make it clearer when being used in tandem with
4358 `impl Trait` because it is equivalent to the following syntax:
4359 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4360 `Box<Trait> == Box<dyn Trait>`.
4361 - [Attributes on generic parameters such as types and lifetimes are
4362 now stable.][48851] e.g.
4363 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4364 - [The `#[must_use]` attribute can now also be used on functions as well as
4365 types.][48925] It provides a lint that by default warns users when the
4366 value returned by a function has not been used.
4370 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4374 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4375 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4376 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4377 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4378 the `cfg` attribute.
4379 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4380 std are now available in core.][49896]
4381 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4383 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4384 that the operation isn't done in place.
4385 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4386 the `#[must_use]` attribute][49533] to warn about unused potentially
4387 expensive allocations.
4391 - [`DoubleEndedIterator::rfind`]
4392 - [`DoubleEndedIterator::rfold`]
4393 - [`DoubleEndedIterator::try_rfold`]
4394 - [`Duration::from_micros`]
4395 - [`Duration::from_nanos`]
4396 - [`Duration::subsec_micros`]
4397 - [`Duration::subsec_millis`]
4398 - [`HashMap::remove_entry`]
4399 - [`Iterator::try_fold`]
4400 - [`Iterator::try_for_each`]
4402 - [`Option::filter`]
4403 - [`String::replace_range`]
4404 - [`Take::set_limit`]
4405 - [`hint::unreachable_unchecked`]
4406 - [`os::unix::process::parent_id`]
4407 - [`ptr::swap_nonoverlapping`]
4408 - [`slice::rsplit_mut`]
4410 - [`slice::swap_with_slice`]
4414 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4415 `readme`, and `repository` fields.][cargo/5386]
4416 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4417 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4418 a different directory than `target` for placing compilation artifacts.
4419 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4420 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4421 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4422 where cargo would infer a binary, Cargo will produce a warning. You can
4423 disable this feature ahead of time by setting any of the following to false:
4424 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4425 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4426 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4430 - [Added “The Rustc book” into the official documentation.][49707]
4431 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4432 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4436 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4437 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4438 compile, `"".is_empty()` will still compile.
4439 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4440 will only print the inner type.][48553] E.g.
4441 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4442 not `AtomicBool(true)`.
4443 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4444 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4445 alignment should cover all use cases.
4446 - The `.description()` method on the `std::error::Error` trait
4447 [has been soft-deprecated][50163]. It is no longer required to implement it.
4449 [48553]: https://github.com/rust-lang/rust/pull/48553/
4450 [48851]: https://github.com/rust-lang/rust/pull/48851/
4451 [48925]: https://github.com/rust-lang/rust/pull/48925/
4452 [49533]: https://github.com/rust-lang/rust/pull/49533/
4453 [49623]: https://github.com/rust-lang/rust/pull/49623/
4454 [49630]: https://github.com/rust-lang/rust/pull/49630/
4455 [49664]: https://github.com/rust-lang/rust/pull/49664/
4456 [49699]: https://github.com/rust-lang/rust/pull/49699/
4457 [49707]: https://github.com/rust-lang/rust/pull/49707/
4458 [49719]: https://github.com/rust-lang/rust/pull/49719/
4459 [49896]: https://github.com/rust-lang/rust/pull/49896/
4460 [49968]: https://github.com/rust-lang/rust/pull/49968/
4461 [50163]: https://github.com/rust-lang/rust/pull/50163
4462 [50177]: https://github.com/rust-lang/rust/pull/50177/
4463 [50378]: https://github.com/rust-lang/rust/pull/50378/
4464 [50398]: https://github.com/rust-lang/rust/pull/50398/
4465 [50423]: https://github.com/rust-lang/rust/pull/50423/
4466 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4467 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4468 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4469 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4470 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4471 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4472 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4473 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4474 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4475 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4476 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4477 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4478 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4479 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4480 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4481 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4482 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4483 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4484 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4485 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4486 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4487 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4488 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4489 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4490 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4491 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4492 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4493 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4494 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4495 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4498 Version 1.26.2 (2018-06-05)
4499 ==========================
4504 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4506 [51117]: https://github.com/rust-lang/rust/issues/51117
4509 Version 1.26.1 (2018-05-29)
4510 ==========================
4515 - [RLS now works on Windows.][50646]
4516 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4522 - [`fn main() -> impl Trait` no longer works for non-Termination
4524 This reverts an accidental stabilization.
4525 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4526 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4528 [50646]: https://github.com/rust-lang/rust/issues/50646
4529 [50656]: https://github.com/rust-lang/rust/pull/50656
4530 [50812]: https://github.com/rust-lang/rust/pull/50812
4531 [50950]: https://github.com/rust-lang/rust/issues/50950
4532 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4534 Version 1.26.0 (2018-05-10)
4535 ==========================
4539 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4540 implement either or both traits.][49299]
4541 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4542 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4543 lifetime can be elided.][49458]
4544 - [`impl Trait` is now stable allowing you to have abstract types in returns
4545 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4546 `fn open(path: impl AsRef<Path>)`.
4547 - [Pattern matching will now automatically apply dereferences.][49394]
4548 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4549 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4550 - [A lot of operations are now available in a const context.][46882] E.g. You
4551 can now index into constant arrays, reference and dereference into constants,
4552 and use tuple struct constructors.
4553 - [Fixed entry slice patterns are now stable.][48516] E.g.
4555 let points = [1, 2, 3, 4];
4557 [1, 2, 3, 4] => println!("All points were sequential."),
4558 _ => println!("Not all points were sequential."),
4565 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4566 - [Fixed exponential projection complexity on nested types.][48296]
4567 This can provide up to a ~12% reduction in compile times for certain crates.
4568 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4569 to remap path prefixes outputted by the compiler.
4570 - [Added `powerpc-unknown-netbsd` target.][48281]
4574 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4575 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4576 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4577 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4578 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4579 - [`ascii::escape_default` is now available in libcore.][48735]
4580 - [Trailing commas are now supported in std and core macros.][48056]
4581 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4582 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4587 - [`*const T::copy_to_nonoverlapping`]
4588 - [`*const T::copy_to`]
4589 - [`*const T::read_unaligned`]
4590 - [`*const T::read_volatile`]
4591 - [`*const T::read`]
4593 - [`*const T::wrapping_add`]
4594 - [`*const T::wrapping_sub`]
4596 - [`*mut T::copy_to_nonoverlapping`]
4597 - [`*mut T::copy_to`]
4598 - [`*mut T::read_unaligned`]
4599 - [`*mut T::read_volatile`]
4601 - [`*mut T::replace`]
4604 - [`*mut T::wrapping_add`]
4605 - [`*mut T::wrapping_sub`]
4606 - [`*mut T::write_bytes`]
4607 - [`*mut T::write_unaligned`]
4608 - [`*mut T::write_volatile`]
4611 - [`FromUtf8Error::as_bytes`]
4612 - [`LocalKey::try_with`]
4613 - [`Option::cloned`]
4614 - [`btree_map::Entry::and_modify`]
4615 - [`fs::read_to_string`]
4618 - [`hash_map::Entry::and_modify`]
4619 - [`iter::FusedIterator`]
4620 - [`ops::RangeInclusive`]
4621 - [`ops::RangeToInclusive`]
4623 - [`slice::rotate_left`]
4624 - [`slice::rotate_right`]
4625 - [`String::retain`]
4630 - [Cargo will now output path to custom commands when `-v` is
4631 passed with `--list`][cargo/5041]
4632 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4636 - [The second edition of "The Rust Programming Language" book is now recommended
4637 over the first.][48404]
4642 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4643 syntax is now invalid.
4645 use std::ops::Fn as dyn;
4646 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4648 - [The result of dereferences are no longer promoted to `'static`.][47408]
4652 const PAIR: &(i32, i32) = &(0, 1);
4653 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4656 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4657 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4659 - [Removed hoedown from rustdoc.][48274]
4660 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4662 [46882]: https://github.com/rust-lang/rust/pull/46882
4663 [47379]: https://github.com/rust-lang/rust/pull/47379
4664 [47408]: https://github.com/rust-lang/rust/pull/47408
4665 [47813]: https://github.com/rust-lang/rust/pull/47813
4666 [48056]: https://github.com/rust-lang/rust/pull/48056
4667 [48125]: https://github.com/rust-lang/rust/pull/48125
4668 [48166]: https://github.com/rust-lang/rust/pull/48166
4669 [48235]: https://github.com/rust-lang/rust/pull/48235
4670 [48274]: https://github.com/rust-lang/rust/pull/48274
4671 [48281]: https://github.com/rust-lang/rust/pull/48281
4672 [48296]: https://github.com/rust-lang/rust/pull/48296
4673 [48326]: https://github.com/rust-lang/rust/pull/48326
4674 [48359]: https://github.com/rust-lang/rust/pull/48359
4675 [48404]: https://github.com/rust-lang/rust/pull/48404
4676 [48481]: https://github.com/rust-lang/rust/pull/48481
4677 [48516]: https://github.com/rust-lang/rust/pull/48516
4678 [48628]: https://github.com/rust-lang/rust/pull/48628
4679 [48629]: https://github.com/rust-lang/rust/pull/48629
4680 [48657]: https://github.com/rust-lang/rust/pull/48657
4681 [48735]: https://github.com/rust-lang/rust/pull/48735
4682 [48978]: https://github.com/rust-lang/rust/pull/48978
4683 [49101]: https://github.com/rust-lang/rust/pull/49101
4684 [49109]: https://github.com/rust-lang/rust/pull/49109
4685 [49121]: https://github.com/rust-lang/rust/pull/49121
4686 [49162]: https://github.com/rust-lang/rust/pull/49162
4687 [49184]: https://github.com/rust-lang/rust/pull/49184
4688 [49234]: https://github.com/rust-lang/rust/pull/49234
4689 [49255]: https://github.com/rust-lang/rust/pull/49255
4690 [49299]: https://github.com/rust-lang/rust/pull/49299
4691 [49305]: https://github.com/rust-lang/rust/pull/49305
4692 [49394]: https://github.com/rust-lang/rust/pull/49394
4693 [49458]: https://github.com/rust-lang/rust/pull/49458
4694 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4695 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4696 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4697 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4698 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4699 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4700 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4701 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4702 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4703 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4704 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4705 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4706 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4707 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4708 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4709 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4710 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4711 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4712 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4713 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4714 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4715 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4716 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4717 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4718 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4719 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4720 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4721 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4722 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4723 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4724 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4725 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4726 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4727 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4728 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4729 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4730 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4731 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4732 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4733 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4734 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4735 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4738 Version 1.25.0 (2018-03-29)
4739 ==========================
4743 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4744 - [You can now use nested groups of imports.][47948]
4745 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4746 - [You can now have `|` at the start of a match arm.][47947] e.g.
4748 enum Foo { A, B, C }
4754 | Foo::B => println!("AB"),
4755 | Foo::C => println!("C"),
4762 - [Upgraded to LLVM 6.][47828]
4763 - [Added `-C lto=val` option.][47521]
4764 - [Added `i586-unknown-linux-musl` target][47282]
4768 - [Impl Send for `process::Command` on Unix.][47760]
4769 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4770 - [`UnsafeCell::into_inner` is now safe.][47204]
4771 - [Implement libstd for CloudABI.][47268]
4772 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4773 - [Implement `AsRef<Path>` for Component][46985]
4774 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4775 - [Moved `Duration` to libcore.][46666]
4779 - [`Location::column`]
4782 The following functions can now be used in a constant expression.
4783 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4784 - [`Duration::new`][47300]
4785 - [`Duration::from_secs`][47300]
4786 - [`Duration::from_millis`][47300]
4790 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4791 - [`cargo new` now defaults to creating a binary crate, instead of a
4792 library crate.][cargo/5029]
4796 - [Rust by example is now shipped with new releases][46196]
4800 - [Deprecated `net::lookup_host`.][47510]
4801 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4802 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4803 around indexing operations (see [#47349][47349]). This has been fixed (which also
4804 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4805 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4807 [33903]: https://github.com/rust-lang/rust/pull/33903
4808 [47947]: https://github.com/rust-lang/rust/pull/47947
4809 [47948]: https://github.com/rust-lang/rust/pull/47948
4810 [47760]: https://github.com/rust-lang/rust/pull/47760
4811 [47790]: https://github.com/rust-lang/rust/pull/47790
4812 [47828]: https://github.com/rust-lang/rust/pull/47828
4813 [47398]: https://github.com/rust-lang/rust/pull/47398
4814 [47510]: https://github.com/rust-lang/rust/pull/47510
4815 [47521]: https://github.com/rust-lang/rust/pull/47521
4816 [47204]: https://github.com/rust-lang/rust/pull/47204
4817 [47251]: https://github.com/rust-lang/rust/pull/47251
4818 [47268]: https://github.com/rust-lang/rust/pull/47268
4819 [47282]: https://github.com/rust-lang/rust/pull/47282
4820 [47300]: https://github.com/rust-lang/rust/pull/47300
4821 [47349]: https://github.com/rust-lang/rust/pull/47349
4822 [46931]: https://github.com/rust-lang/rust/pull/46931
4823 [46985]: https://github.com/rust-lang/rust/pull/46985
4824 [47006]: https://github.com/rust-lang/rust/pull/47006
4825 [46830]: https://github.com/rust-lang/rust/pull/46830
4826 [46095]: https://github.com/rust-lang/rust/pull/46095
4827 [46666]: https://github.com/rust-lang/rust/pull/46666
4828 [46196]: https://github.com/rust-lang/rust/pull/46196
4829 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4830 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4831 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4832 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4833 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4836 Version 1.24.1 (2018-03-01)
4837 ==========================
4839 - [Do not abort when unwinding through FFI][48251]
4840 - [Emit UTF-16 files for linker arguments on Windows][48318]
4841 - [Make the error index generator work again][48308]
4842 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4844 [48251]: https://github.com/rust-lang/rust/issues/48251
4845 [48308]: https://github.com/rust-lang/rust/issues/48308
4846 [48318]: https://github.com/rust-lang/rust/issues/48318
4847 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4850 Version 1.24.0 (2018-02-15)
4851 ==========================
4855 - [External `sysv64` ffi is now available.][46528]
4856 eg. `extern "sysv64" fn foo () {}`
4860 - [rustc now uses 16 codegen units by default for release builds.][46910]
4861 For the fastest builds, utilize `codegen-units=1`.
4862 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4863 - [Add `aarch64-unknown-openbsd` support][46760]
4867 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4868 improvement in performance in the majority of cases.
4869 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4870 with Windows.][46798]
4871 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4872 - [impl `From<bool>` for `AtomicBool`][46293]
4873 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4874 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4875 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4876 - [float::from_bits now just uses transmute.][46012] This provides
4877 some optimisations from LLVM.
4878 - [Copied `AsciiExt` methods onto `char`][46077]
4879 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4880 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4881 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4882 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4886 - [`RefCell::replace`]
4888 - [`atomic::spin_loop_hint`]
4890 The following functions can now be used in a constant expression.
4891 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4893 - [`AtomicBool::new`][46287]
4894 - [`AtomicUsize::new`][46287]
4895 - [`AtomicIsize::new`][46287]
4896 - [`AtomicPtr::new`][46287]
4897 - [`Cell::new`][46287]
4898 - [`{integer}::min_value`][46287]
4899 - [`{integer}::max_value`][46287]
4900 - [`mem::size_of`][46287]
4901 - [`mem::align_of`][46287]
4902 - [`ptr::null`][46287]
4903 - [`ptr::null_mut`][46287]
4904 - [`RefCell::new`][46287]
4905 - [`UnsafeCell::new`][46287]
4909 - [Added a `workspace.default-members` config that
4910 overrides implied `--all` in virtual workspaces.][cargo/4743]
4911 - [Enable incremental by default on development builds.][cargo/4817] Also added
4912 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4913 per-project or global basis respectively.
4920 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4921 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4922 in accordance with IETF RFC 4291 §2.2.
4923 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4924 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4925 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4926 - [Leading zeros in tuple struct members is now an error][47084]
4927 - [`column!()` macro is one-based instead of zero-based][46977]
4928 - [`fmt::Arguments` can no longer be shared across threads][45198]
4929 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4930 - [Cargo sets a different working directory for the compiler][cargo/4788]
4932 [44884]: https://github.com/rust-lang/rust/pull/44884
4933 [45198]: https://github.com/rust-lang/rust/pull/45198
4934 [45506]: https://github.com/rust-lang/rust/pull/45506
4935 [45904]: https://github.com/rust-lang/rust/pull/45904
4936 [45990]: https://github.com/rust-lang/rust/pull/45990
4937 [46012]: https://github.com/rust-lang/rust/pull/46012
4938 [46077]: https://github.com/rust-lang/rust/pull/46077
4939 [46094]: https://github.com/rust-lang/rust/pull/46094
4940 [46284]: https://github.com/rust-lang/rust/pull/46284
4941 [46287]: https://github.com/rust-lang/rust/pull/46287
4942 [46293]: https://github.com/rust-lang/rust/pull/46293
4943 [46528]: https://github.com/rust-lang/rust/pull/46528
4944 [46671]: https://github.com/rust-lang/rust/pull/46671
4945 [46713]: https://github.com/rust-lang/rust/pull/46713
4946 [46735]: https://github.com/rust-lang/rust/pull/46735
4947 [46749]: https://github.com/rust-lang/rust/pull/46749
4948 [46760]: https://github.com/rust-lang/rust/pull/46760
4949 [46798]: https://github.com/rust-lang/rust/pull/46798
4950 [46828]: https://github.com/rust-lang/rust/pull/46828
4951 [46831]: https://github.com/rust-lang/rust/pull/46831
4952 [46833]: https://github.com/rust-lang/rust/pull/46833
4953 [46910]: https://github.com/rust-lang/rust/pull/46910
4954 [46977]: https://github.com/rust-lang/rust/pull/46977
4955 [47018]: https://github.com/rust-lang/rust/pull/47018
4956 [47080]: https://github.com/rust-lang/rust/pull/47080
4957 [47084]: https://github.com/rust-lang/rust/pull/47084
4958 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4959 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4960 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4961 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4962 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4963 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4966 Version 1.23.0 (2018-01-04)
4967 ==========================
4971 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4972 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4973 Which should fix some confusing errors in some operations.
4977 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4978 undefined behavior.][45920]
4979 - [rustc now suggests renaming import if names clash.][45660]
4980 - [Display errors/warnings correctly when there are zero-width or
4981 wide characters.][45711]
4982 - [rustc now avoids unnecessary copies of arguments that are
4983 simple bindings][45380] This should improve memory usage on average by 5-10%.
4984 - [Updated musl used to build musl rustc to 1.1.17][45393]
4988 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4989 - [Implement Hash for raw pointers to unsized types][45483]
4990 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4991 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4992 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4993 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4994 and `<*mut T>::as_mut`][44932]
4995 - [Optimized `Thread::{park, unpark}` implementation][45524]
4996 - [Improved `SliceExt::binary_search` performance.][45333]
4997 - [impl `FromIterator<()>` for `()`][45379]
4998 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5006 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5007 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5008 - [Added unit test checking to `cargo check`][cargo/4592]
5009 - [Cargo now lets you install a specific version
5010 using `cargo install --version`][cargo/4637]
5014 - [Releases now ship with the Cargo book documentation.][45692]
5015 - [rustdoc now prints rendering warnings on every run.][45324]
5019 - [Changes have been made to type equality to make it more correct,
5020 in rare cases this could break some code.][45853] [Tracking issue for
5021 further information][45852]
5022 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5023 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5024 Android 9, the minimum supported version is Android 14.
5025 - [Bumped the minimum LLVM to 3.9][45326]
5027 [44042]: https://github.com/rust-lang/rust/pull/44042
5028 [44932]: https://github.com/rust-lang/rust/pull/44932
5029 [45267]: https://github.com/rust-lang/rust/pull/45267
5030 [45324]: https://github.com/rust-lang/rust/pull/45324
5031 [45326]: https://github.com/rust-lang/rust/pull/45326
5032 [45333]: https://github.com/rust-lang/rust/pull/45333
5033 [45379]: https://github.com/rust-lang/rust/pull/45379
5034 [45380]: https://github.com/rust-lang/rust/pull/45380
5035 [45393]: https://github.com/rust-lang/rust/pull/45393
5036 [45435]: https://github.com/rust-lang/rust/pull/45435
5037 [45483]: https://github.com/rust-lang/rust/pull/45483
5038 [45524]: https://github.com/rust-lang/rust/pull/45524
5039 [45571]: https://github.com/rust-lang/rust/pull/45571
5040 [45580]: https://github.com/rust-lang/rust/pull/45580
5041 [45610]: https://github.com/rust-lang/rust/pull/45610
5042 [45660]: https://github.com/rust-lang/rust/pull/45660
5043 [45692]: https://github.com/rust-lang/rust/pull/45692
5044 [45711]: https://github.com/rust-lang/rust/pull/45711
5045 [45772]: https://github.com/rust-lang/rust/pull/45772
5046 [45852]: https://github.com/rust-lang/rust/issues/45852
5047 [45853]: https://github.com/rust-lang/rust/pull/45853
5048 [45887]: https://github.com/rust-lang/rust/pull/45887
5049 [45920]: https://github.com/rust-lang/rust/pull/45920
5050 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5051 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5052 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5055 Version 1.22.1 (2017-11-22)
5056 ==========================
5058 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5060 [46183]: https://github.com/rust-lang/rust/pull/46183
5062 Version 1.22.0 (2017-11-22)
5063 ==========================
5067 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5068 - [Now accepts underscores in unicode escapes][43716]
5069 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5070 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5074 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5075 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5076 This should decrease compile times for debug builds.
5077 - [strict memory alignment now enabled on ARMv6][45094]
5078 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5082 - [Allow atomic operations up to 32 bits
5083 on `armv5te_unknown_linux_gnueabi`][44978]
5084 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5085 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5086 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5087 - [Properly detect overflow in `Instant += Duration`.][44220]
5088 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5089 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5090 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5097 - [Cargo will now build multi file examples in subdirectories of the `examples`
5098 folder that have a `main.rs` file.][cargo/4496]
5099 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5100 the old format will continue to work and can be updated with `cargo update`.
5101 - [Now supports vendoring git repositories][cargo/3992]
5105 - [`libbacktrace` is now available on Apple platforms.][44251]
5106 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5107 This now lets you specify that a given code example will fail to compile.
5111 - [The minimum Android version that rustc can build for has been bumped
5112 to `4.0` from `2.3`][45656]
5113 - [Allowing `T op= &T` for numeric types has broken some type
5114 inference cases][45480]
5117 [42526]: https://github.com/rust-lang/rust/pull/42526
5118 [43017]: https://github.com/rust-lang/rust/pull/43017
5119 [43716]: https://github.com/rust-lang/rust/pull/43716
5120 [43949]: https://github.com/rust-lang/rust/pull/43949
5121 [44015]: https://github.com/rust-lang/rust/pull/44015
5122 [44220]: https://github.com/rust-lang/rust/pull/44220
5123 [44251]: https://github.com/rust-lang/rust/pull/44251
5124 [44287]: https://github.com/rust-lang/rust/pull/44287
5125 [44303]: https://github.com/rust-lang/rust/pull/44303
5126 [44456]: https://github.com/rust-lang/rust/pull/44456
5127 [44466]: https://github.com/rust-lang/rust/pull/44466
5128 [44895]: https://github.com/rust-lang/rust/pull/44895
5129 [44966]: https://github.com/rust-lang/rust/pull/44966
5130 [44978]: https://github.com/rust-lang/rust/pull/44978
5131 [45041]: https://github.com/rust-lang/rust/pull/45041
5132 [45064]: https://github.com/rust-lang/rust/pull/45064
5133 [45075]: https://github.com/rust-lang/rust/pull/45075
5134 [45094]: https://github.com/rust-lang/rust/pull/45094
5135 [45095]: https://github.com/rust-lang/rust/pull/45095
5136 [45480]: https://github.com/rust-lang/rust/issues/45480
5137 [45656]: https://github.com/rust-lang/rust/pull/45656
5138 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5139 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5140 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5147 Version 1.21.0 (2017-10-12)
5148 ==========================
5152 - [You can now use static references for literals.][43838]
5156 let x: &'static u32 = &0;
5159 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5162 my_macro!(Vec<i32>::new); // Always worked
5163 my_macro!(Vec::<i32>::new); // Now works
5168 - [Upgraded jemalloc to 4.5.0][43911]
5169 - [Enabled unwinding panics on Redox][43917]
5170 - [Now runs LLVM in parallel during translation phase.][43506]
5171 This should reduce peak memory usage.
5175 - [Generate builtin impls for `Clone` for all arrays and tuples that
5176 are `T: Clone`][43690]
5177 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5178 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5179 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5184 [`std::mem::discriminant`]
5188 - [You can now call `cargo install` with multiple package names][cargo/4216]
5189 - [Cargo commands inside a virtual workspace will now implicitly
5190 pass `--all`][cargo/4335]
5191 - [Added a `[patch]` section to `Cargo.toml` to handle
5192 prepublication dependencies][cargo/4123] [RFC 1969]
5193 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5194 like patterns][cargo/4270]
5195 - [Added the `--all-targets` option][cargo/4400]
5196 - [Using required dependencies as a feature is now deprecated and emits
5197 a warning][cargo/4364]
5202 - [Cargo docs are moving][43916]
5203 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5204 - [The rustdoc book is now available][43863]
5205 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5206 - [Added a preview of RLS has been made available through rustup][44204]
5207 Install with `rustup component add rls-preview`
5208 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5209 Previously only showed `std::os::unix`.
5213 - [Changes in method matching against higher-ranked types][43880] This may cause
5214 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5215 - [rustc's JSON error output's byte position start at top of file.][42973]
5216 Was previously relative to the rustc's internal `CodeMap` struct which
5217 required the unstable library `libsyntax` to correctly use.
5218 - [`unused_results` lint no longer ignores booleans][43728]
5220 [42565]: https://github.com/rust-lang/rust/pull/42565
5221 [42973]: https://github.com/rust-lang/rust/pull/42973
5222 [43348]: https://github.com/rust-lang/rust/pull/43348
5223 [43459]: https://github.com/rust-lang/rust/pull/43459
5224 [43506]: https://github.com/rust-lang/rust/pull/43506
5225 [43540]: https://github.com/rust-lang/rust/pull/43540
5226 [43690]: https://github.com/rust-lang/rust/pull/43690
5227 [43728]: https://github.com/rust-lang/rust/pull/43728
5228 [43838]: https://github.com/rust-lang/rust/pull/43838
5229 [43863]: https://github.com/rust-lang/rust/pull/43863
5230 [43880]: https://github.com/rust-lang/rust/pull/43880
5231 [43911]: https://github.com/rust-lang/rust/pull/43911
5232 [43916]: https://github.com/rust-lang/rust/pull/43916
5233 [43917]: https://github.com/rust-lang/rust/pull/43917
5234 [44204]: https://github.com/rust-lang/rust/pull/44204
5235 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5236 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5237 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5238 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5239 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5240 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5241 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5242 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5243 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5245 Version 1.20.0 (2017-08-31)
5246 ===========================
5250 - [Associated constants are now stabilised.][42809]
5251 - [A lot of macro bugs are now fixed.][42913]
5256 - [Struct fields are now properly coerced to the expected field type.][42807]
5257 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5258 `wasm32-experimental-emscripten` target.
5259 - [Changed some of the error messages to be more helpful.][42033]
5260 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5262 - [rustc now reports the total number of errors on compilation failure][43015]
5263 previously this was only the number of errors in the pass that failed.
5264 - [Expansion in rustc has been sped up 29x.][42533]
5265 - [added `msp430-none-elf` target.][43099]
5266 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5268 - [Fixes backtraces on Redox][43228]
5269 - [rustc now identifies different versions of same crate when absolute paths of
5270 different types match in an error message.][42826]
5276 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5277 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5279 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5280 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5281 - [Impl `Clone` for `DefaultHasher`.][42799]
5282 - [Impl `Sync` for `SyncSender`.][42397]
5283 - [Impl `FromStr` for `char`][42271]
5284 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5286 - [allow messages in the `unimplemented!()` macro.][42155]
5287 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5288 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5289 - [Upgrade to Unicode 10.0.0][42999]
5290 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5291 - [Skip the main thread's manual stack guard on Linux][43072]
5292 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5293 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5295 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5300 - [`CStr::into_c_string`]
5301 - [`CString::as_c_str`]
5302 - [`CString::into_boxed_c_str`]
5303 - [`Chain::get_mut`]
5304 - [`Chain::get_ref`]
5305 - [`Chain::into_inner`]
5306 - [`Option::get_or_insert_with`]
5307 - [`Option::get_or_insert`]
5308 - [`OsStr::into_os_string`]
5309 - [`OsString::into_boxed_os_str`]
5312 - [`Utf8Error::error_len`]
5313 - [`char::EscapeDebug`]
5314 - [`char::escape_debug`]
5315 - [`compile_error!`]
5316 - [`f32::from_bits`]
5318 - [`f64::from_bits`]
5320 - [`mem::ManuallyDrop`]
5321 - [`slice::sort_unstable_by_key`]
5322 - [`slice::sort_unstable_by`]
5323 - [`slice::sort_unstable`]
5324 - [`str::from_boxed_utf8_unchecked`]
5325 - [`str::as_bytes_mut`]
5326 - [`str::as_bytes_mut`]
5327 - [`str::from_utf8_mut`]
5328 - [`str::from_utf8_unchecked_mut`]
5330 - [`str::get_unchecked_mut`]
5331 - [`str::get_unchecked`]
5333 - [`str::into_boxed_bytes`]
5338 - [Cargo API token location moved from `~/.cargo/config` to
5339 `~/.cargo/credentials`.][cargo/3978]
5340 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5341 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5342 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5343 - [You can now specify version of a binary when installed through
5344 `cargo install` using `--vers`.][cargo/4229]
5345 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5346 failure.][cargo/4248]
5347 - [Changed the convention around which file is the crate root.][cargo/4259]
5348 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5349 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5354 - [Functions with `'static` in their return types will now not be as usable as
5355 if they were using lifetime parameters instead.][42417]
5356 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5357 takes the sign of NaN into account where previously didn't.][42430]
5359 [42033]: https://github.com/rust-lang/rust/pull/42033
5360 [42155]: https://github.com/rust-lang/rust/pull/42155
5361 [42271]: https://github.com/rust-lang/rust/pull/42271
5362 [42397]: https://github.com/rust-lang/rust/pull/42397
5363 [42417]: https://github.com/rust-lang/rust/pull/42417
5364 [42430]: https://github.com/rust-lang/rust/pull/42430
5365 [42431]: https://github.com/rust-lang/rust/pull/42431
5366 [42533]: https://github.com/rust-lang/rust/pull/42533
5367 [42571]: https://github.com/rust-lang/rust/pull/42571
5368 [42613]: https://github.com/rust-lang/rust/pull/42613
5369 [42799]: https://github.com/rust-lang/rust/pull/42799
5370 [42807]: https://github.com/rust-lang/rust/pull/42807
5371 [42809]: https://github.com/rust-lang/rust/pull/42809
5372 [42822]: https://github.com/rust-lang/rust/pull/42822
5373 [42826]: https://github.com/rust-lang/rust/pull/42826
5374 [42854]: https://github.com/rust-lang/rust/pull/42854
5375 [42913]: https://github.com/rust-lang/rust/pull/42913
5376 [42999]: https://github.com/rust-lang/rust/pull/42999
5377 [43011]: https://github.com/rust-lang/rust/pull/43011
5378 [43015]: https://github.com/rust-lang/rust/pull/43015
5379 [43072]: https://github.com/rust-lang/rust/pull/43072
5380 [43077]: https://github.com/rust-lang/rust/pull/43077
5381 [43097]: https://github.com/rust-lang/rust/pull/43097
5382 [43099]: https://github.com/rust-lang/rust/pull/43099
5383 [43170]: https://github.com/rust-lang/rust/pull/43170
5384 [43178]: https://github.com/rust-lang/rust/pull/43178
5385 [43185]: https://github.com/rust-lang/rust/pull/43185
5386 [43228]: https://github.com/rust-lang/rust/pull/43228
5387 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5388 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5389 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5390 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5391 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5392 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5393 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5394 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5395 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5396 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5397 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5398 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5399 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5400 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5401 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5402 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5403 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5404 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5405 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5406 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5407 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5408 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5409 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5410 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5411 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5412 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5413 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5414 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5415 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5416 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5417 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5418 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5419 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5420 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5421 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5422 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5423 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5424 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5425 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5428 Version 1.19.0 (2017-07-20)
5429 ===========================
5434 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5435 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5436 - [Macro recursion limit increased to 1024 from 64.][41676]
5437 - [Added lint for detecting unused macros.][41907]
5438 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5439 For example: `let x = loop { break 7; };`
5440 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5441 contain `Copy` types and cannot have a `Drop` implementation.
5442 Example: `union Foo { bar: u8, baz: usize }`
5443 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5444 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5449 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5450 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5451 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5452 you should use `--target armv7-linux-androideabi`.
5453 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5454 - [Minor optimisation of string operations.][42037]
5455 - [Compiler error message is now `aborting due to previous error(s)` instead of
5456 `aborting due to N previous errors`][42150] This was previously inaccurate and
5457 would only count certain kinds of errors.
5458 - [The compiler now supports Visual Studio 2017][42225]
5459 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5460 - [Added a lot][42264] of [new error codes][42302]
5461 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5462 libraries with C Run-time Libraries(CRT) to be statically linked.
5463 - [Fixed various ARM codegen bugs][42740]
5468 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5469 `Extend<Cow<'a, str>>`][41449]
5470 - [`Vec` now implements `From<&mut [T]>`][41530]
5471 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5472 - [`SplitWhitespace` now implements `Clone`][41659]
5473 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5475 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5476 macros, but for printing to stderr.
5481 - [`OsString::shrink_to_fit`]
5484 - [`thread::ThreadId`]
5489 - [Build scripts can now add environment variables to the environment
5490 the crate is being compiled in.
5491 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5492 - [Subcommands now replace the current process rather than spawning a new
5493 child process][cargo/3970]
5494 - [Workspace members can now accept glob file patterns][cargo/3979]
5495 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5496 the members in a given workspace.][cargo/3988]
5497 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5498 - [Target directory path is now in the cargo metadata][cargo/4022]
5499 - [Cargo no longer checks out a local working directory for the
5500 crates.io index][cargo/4026] This should provide smaller file size for the
5501 registry, and improve cloning times, especially on Windows machines.
5502 - [Added an `--exclude` option for excluding certain packages when using the
5503 `--all` option][cargo/4031]
5504 - [Cargo will now automatically retry when receiving a 5xx error
5505 from crates.io][cargo/4032]
5506 - [The `--features` option now accepts multiple comma or space
5507 delimited values.][cargo/4084]
5508 - [Added support for custom target specific runners][cargo/3954]
5513 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5515 - [Rust will now release XZ compressed packages][rust-installer/57]
5516 - [rustup will now prefer to download rust packages with
5517 XZ compression][rustup/1100] over GZip packages.
5518 - [Added the ability to escape `#` in rust documentation][41785] By adding
5519 additional `#`'s ie. `##` is now `#`
5524 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5525 - [`-Z` flags are now no longer allowed to be used on the stable
5526 compiler.][41751] This has been a warning for a year previous to this.
5527 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5528 longer works][42844]. Users should migrate to the built-in `check`
5529 command, which has been available since 1.16.
5530 - [Ending a float literal with `._` is now a hard error.
5531 Example: `42._` .][41946]
5532 - [Any use of a private `extern crate` outside of its module is now a
5533 hard error.][36886] This was previously a warning.
5534 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5535 relative while the `::` prefix makes a path absolute, but was ignored and the
5536 path was relative regardless.
5537 - [Floating point constants in match patterns is now a hard error][36890]
5538 This was previously a warning.
5539 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5540 match patterns is now a hard error][36891] This was previously a warning.
5541 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5543 - [From the pound escape, lines consisting of multiple `#`s are
5545 - [It is an error to re-export private enum variants][42460]. This is
5546 known to break a number of crates that depend on an older version of
5548 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5549 to use it to find the linker, and the build will fail where it did
5550 not previously][42607]
5552 [36886]: https://github.com/rust-lang/rust/issues/36886
5553 [36888]: https://github.com/rust-lang/rust/issues/36888
5554 [36890]: https://github.com/rust-lang/rust/issues/36890
5555 [36891]: https://github.com/rust-lang/rust/issues/36891
5556 [36892]: https://github.com/rust-lang/rust/issues/36892
5557 [37406]: https://github.com/rust-lang/rust/issues/37406
5558 [39983]: https://github.com/rust-lang/rust/pull/39983
5559 [41145]: https://github.com/rust-lang/rust/pull/41145
5560 [41192]: https://github.com/rust-lang/rust/pull/41192
5561 [41258]: https://github.com/rust-lang/rust/pull/41258
5562 [41370]: https://github.com/rust-lang/rust/pull/41370
5563 [41449]: https://github.com/rust-lang/rust/pull/41449
5564 [41530]: https://github.com/rust-lang/rust/pull/41530
5565 [41624]: https://github.com/rust-lang/rust/pull/41624
5566 [41656]: https://github.com/rust-lang/rust/pull/41656
5567 [41659]: https://github.com/rust-lang/rust/pull/41659
5568 [41676]: https://github.com/rust-lang/rust/pull/41676
5569 [41751]: https://github.com/rust-lang/rust/pull/41751
5570 [41764]: https://github.com/rust-lang/rust/pull/41764
5571 [41785]: https://github.com/rust-lang/rust/pull/41785
5572 [41873]: https://github.com/rust-lang/rust/pull/41873
5573 [41907]: https://github.com/rust-lang/rust/pull/41907
5574 [41946]: https://github.com/rust-lang/rust/pull/41946
5575 [42016]: https://github.com/rust-lang/rust/pull/42016
5576 [42037]: https://github.com/rust-lang/rust/pull/42037
5577 [42068]: https://github.com/rust-lang/rust/pull/42068
5578 [42150]: https://github.com/rust-lang/rust/pull/42150
5579 [42162]: https://github.com/rust-lang/rust/pull/42162
5580 [42225]: https://github.com/rust-lang/rust/pull/42225
5581 [42264]: https://github.com/rust-lang/rust/pull/42264
5582 [42302]: https://github.com/rust-lang/rust/pull/42302
5583 [42460]: https://github.com/rust-lang/rust/issues/42460
5584 [42607]: https://github.com/rust-lang/rust/issues/42607
5585 [42740]: https://github.com/rust-lang/rust/pull/42740
5586 [42844]: https://github.com/rust-lang/rust/issues/42844
5587 [42948]: https://github.com/rust-lang/rust/pull/42948
5588 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5589 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5590 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5591 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5592 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5593 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5594 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5595 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5596 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5597 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5598 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5599 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5600 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5601 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5602 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5603 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5604 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5605 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5606 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5607 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5608 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5609 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5612 Version 1.18.0 (2017-06-08)
5613 ===========================
5618 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5619 make the item visible to just that module tree. Also accepts the keyword
5620 `crate` to make something public to the whole crate but not users of the
5621 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5622 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5623 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5624 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5625 types like `Write + Send`, trailing `+` are now supported in trait objects,
5626 and better error reporting for trait objects starting with `?Sized`.
5627 - [0e+10 is now a valid floating point literal][40589]
5628 - [Now warns if you bind a lifetime parameter to 'static][40734]
5629 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5630 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5631 representation in some cases.][40377]
5636 - [rustc can now emit mir with `--emit mir`][39891]
5637 - [Improved LLVM IR for trivial functions][40367]
5638 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5639 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5640 opportunities found through profiling
5641 - [Improved backtrace formatting when panicking][38165]
5646 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5647 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5648 iteration or reallocation.
5649 - [Simplified HashMap Bucket interface][40561] provides performance
5650 improvements for iterating and cloning.
5651 - [Specialize Vec::from_elem to use calloc][40409]
5652 - [Fixed Race condition in fs::create_dir_all][39799]
5653 - [No longer caching stdio on Windows][40516]
5654 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5655 2.50%~ faster and in one case now 12.50% faster.
5656 - [Optimized `AtomicBool::fetch_nand`][41143]
5661 - [`Child::try_wait`]
5662 - [`HashMap::retain`]
5663 - [`HashSet::retain`]
5665 - [`TcpStream::peek`]
5666 - [`UdpSocket::peek`]
5667 - [`UdpSocket::peek_from`]
5672 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5673 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5674 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5675 - [Added Android build support][cargo/3885]
5676 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5677 of a certain type, for example `cargo build --bins` will build all
5679 - [Added support for haiku][cargo/3952]
5684 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5685 - [Added rust-windbg script for better debugging on Windows][39983]
5686 - [Rust now uses the official cross compiler for NetBSD][40612]
5687 - [rustdoc now accepts `#` at the start of files][40828]
5688 - [Fixed jemalloc support for musl][41168]
5693 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5694 always placed after the sign if it exists and before the digits. With the `#`
5695 flag the zeroes are placed after the prefix and before the digits.
5696 - [Due to the struct field optimisation][40377], using `transmute` on structs
5697 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5698 always been undefined behavior, but is now more likely to break in practice.
5699 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5700 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5701 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5702 - [Overlapping inherent `impl`s are now a hard error][40728]
5703 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5704 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5705 `out.asm` and `out.ll` instead of only one of the filetypes.
5706 - [ calling a function that returns `Self` will no longer work][41805] when
5707 the size of `Self` cannot be statically determined.
5708 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5709 this has caused a few regressions namely:
5711 - Changed the link order of local static/dynamic libraries (respecting the
5712 order on given rather than having the compiler reorder).
5713 - Changed how MinGW is linked, native code linked to dynamic libraries
5714 may require manually linking to the gcc support library (for the native
5717 [38165]: https://github.com/rust-lang/rust/pull/38165
5718 [39799]: https://github.com/rust-lang/rust/pull/39799
5719 [39891]: https://github.com/rust-lang/rust/pull/39891
5720 [39983]: https://github.com/rust-lang/rust/pull/39983
5721 [40043]: https://github.com/rust-lang/rust/pull/40043
5722 [40241]: https://github.com/rust-lang/rust/pull/40241
5723 [40338]: https://github.com/rust-lang/rust/pull/40338
5724 [40367]: https://github.com/rust-lang/rust/pull/40367
5725 [40377]: https://github.com/rust-lang/rust/pull/40377
5726 [40409]: https://github.com/rust-lang/rust/pull/40409
5727 [40516]: https://github.com/rust-lang/rust/pull/40516
5728 [40556]: https://github.com/rust-lang/rust/pull/40556
5729 [40561]: https://github.com/rust-lang/rust/pull/40561
5730 [40589]: https://github.com/rust-lang/rust/pull/40589
5731 [40612]: https://github.com/rust-lang/rust/pull/40612
5732 [40723]: https://github.com/rust-lang/rust/pull/40723
5733 [40728]: https://github.com/rust-lang/rust/pull/40728
5734 [40731]: https://github.com/rust-lang/rust/pull/40731
5735 [40734]: https://github.com/rust-lang/rust/pull/40734
5736 [40805]: https://github.com/rust-lang/rust/pull/40805
5737 [40807]: https://github.com/rust-lang/rust/pull/40807
5738 [40828]: https://github.com/rust-lang/rust/pull/40828
5739 [40870]: https://github.com/rust-lang/rust/pull/40870
5740 [41085]: https://github.com/rust-lang/rust/pull/41085
5741 [41143]: https://github.com/rust-lang/rust/pull/41143
5742 [41168]: https://github.com/rust-lang/rust/pull/41168
5743 [41270]: https://github.com/rust-lang/rust/issues/41270
5744 [41469]: https://github.com/rust-lang/rust/pull/41469
5745 [41805]: https://github.com/rust-lang/rust/issues/41805
5746 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5747 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5748 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5749 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5750 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5751 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5752 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5753 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5754 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5755 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5756 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5757 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5758 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5759 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5762 Version 1.17.0 (2017-04-27)
5763 ===========================
5768 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5769 * [Fields of structs may be initialized without duplicating the field/variable
5770 names][39761]. [RFC 1682]
5771 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5772 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5773 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5774 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5775 `'b`. Soundness fix.
5776 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5777 * [Static variables may contain references to other statics][40027]
5782 * [Exit quickly on only `--emit dep-info`][40336]
5783 * [Make `-C relocation-model` more correctly determine whether the linker
5784 creates a position-independent executable][40245]
5785 * [Add `-C overflow-checks` to directly control whether integer overflow
5787 * [The rustc type checker now checks items on demand instead of in a single
5788 in-order pass][40008]. This is mostly an internal refactoring in support of
5789 future work, including incremental type checking, but also resolves [RFC
5790 1647], allowing `Self` to appear in `impl` `where` clauses.
5791 * [Optimize vtable loads][39995]
5792 * [Turn off vectorization for Emscripten targets][39990]
5793 * [Provide suggestions for unknown macros imported with `use`][39953]
5794 * [Fix ICEs in path resolution][39939]
5795 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5796 * [Add clearer error message using `&str + &str`][39116]
5807 * [`Ordering::then`]
5808 * [`Ordering::then_with`]
5809 * [`BTreeMap::range`]
5810 * [`BTreeMap::range_mut`]
5811 * [`collections::Bound`]
5812 * [`process::abort`]
5813 * [`ptr::read_unaligned`]
5814 * [`ptr::write_unaligned`]
5815 * [`Result::expect_err`]
5818 * [`Cell::into_inner`]
5824 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5825 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5826 * [`String` implements `FromIterator<&char>`][40028]
5827 * `Box` [implements][40009] a number of new conversions:
5828 `From<Box<str>> for String`,
5829 `From<Box<[T]>> for Vec<T>`,
5830 `From<Box<CStr>> for CString`,
5831 `From<Box<OsStr>> for OsString`,
5832 `From<Box<Path>> for PathBuf`,
5833 `Into<Box<str>> for String`,
5834 `Into<Box<[T]>> for Vec<T>`,
5835 `Into<Box<CStr>> for CString`,
5836 `Into<Box<OsStr>> for OsString`,
5837 `Into<Box<Path>> for PathBuf`,
5838 `Default for Box<str>`,
5839 `Default for Box<CStr>`,
5840 `Default for Box<OsStr>`,
5841 `From<&CStr> for Box<CStr>`,
5842 `From<&OsStr> for Box<OsStr>`,
5843 `From<&Path> for Box<Path>`
5844 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5845 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5846 * [Slightly optimize `slice::sort`][39538]
5847 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5848 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5849 `Box<str>` implements `From<&str>`][39438]
5850 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5851 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5852 * [`format!` estimates the needed capacity before writing a string][39356]
5853 * [Support unprivileged symlink creation in Windows][38921]
5854 * [`PathBuf` implements `Default`][38764]
5855 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5856 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5857 and poor hash functions.
5862 * [Add `cargo check --all`][cargo/3731]
5863 * [Add an option to ignore SSL revocation checking][cargo/3699]
5864 * [Add `cargo run --package`][cargo/3691]
5865 * [Add `required_features`][cargo/3667]
5866 * [Assume `build.rs` is a build script][cargo/3664]
5867 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5872 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5874 * [The "Unstable Book" documents nightly-only features][ubook]
5875 * [Improve the style of the sidebar in rustdoc output][40265]
5876 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5877 * [Fix MSP430 breakage due to `i128`][40257]
5878 * [Preliminary Solaris/SPARCv9 support][39903]
5879 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5880 run without installing the MSVC runtime.
5881 * [`rustdoc --test` includes file names in test names][39788]
5882 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5883 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5884 * [Initial support for `aarch64-unknown-freebsd`][39491]
5885 * [Initial support for `i686-unknown-netbsd`][39426]
5886 * [This release no longer includes the old makefile build system][39431]. Rust
5887 is built with a custom build system, written in Rust, and with Cargo.
5888 * [Add Debug implementations for libcollection structs][39002]
5889 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5890 * [`--test-threads=0` produces an error][38945]
5891 * [`rustup` installs documentation by default][40526]
5892 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5893 WinDbg and Visual Studio to improve the debugging experience.
5898 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5899 workaround, either use MSVC 2015 or run vcvars.bat.
5900 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5901 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5902 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5904 * [`format!` and `Display::to_string` panic if an underlying formatting
5905 implementation returns an error][40117]. Previously the error was silently
5906 ignored. It is incorrect for `write_fmt` to return an error when writing
5908 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5909 crates were marked stable and could be accessed from the stable toolchain.
5910 * [Rust git source no longer includes vendored crates][39728]. Those that need
5911 to build with vendored crates should build from release tarballs.
5912 * [Fix inert attributes from `proc_macro_derives`][39572]
5913 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5914 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5916 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5917 existing code generally ignores the type of dead-code unless a type-hint is
5918 provided; this can cause surprising inference interactions particularly around
5919 defaulting. The new code uniformly ignores the result type of dead-code.
5920 * [Tuple-struct constructors with private fields are no longer visible][38932]
5921 * [Lifetime parameters that do not appear in the arguments are now considered
5922 early-bound][38897], resolving a soundness bug (#[32330]). The
5923 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5925 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5926 * [Make transmuting from fn item types to pointer-sized types a hard
5929 [27787]: https://github.com/rust-lang/rust/issues/27787
5930 [32330]: https://github.com/rust-lang/rust/issues/32330
5931 [34198]: https://github.com/rust-lang/rust/pull/34198
5932 [38161]: https://github.com/rust-lang/rust/pull/38161
5933 [38368]: https://github.com/rust-lang/rust/pull/38368
5934 [38584]: https://github.com/rust-lang/rust/issues/38584
5935 [38661]: https://github.com/rust-lang/rust/pull/38661
5936 [38764]: https://github.com/rust-lang/rust/pull/38764
5937 [38864]: https://github.com/rust-lang/rust/issues/38864
5938 [38897]: https://github.com/rust-lang/rust/pull/38897
5939 [38921]: https://github.com/rust-lang/rust/pull/38921
5940 [38932]: https://github.com/rust-lang/rust/pull/38932
5941 [38945]: https://github.com/rust-lang/rust/pull/38945
5942 [38981]: https://github.com/rust-lang/rust/pull/38981
5943 [39002]: https://github.com/rust-lang/rust/pull/39002
5944 [39116]: https://github.com/rust-lang/rust/pull/39116
5945 [39193]: https://github.com/rust-lang/rust/pull/39193
5946 [39265]: https://github.com/rust-lang/rust/pull/39265
5947 [39356]: https://github.com/rust-lang/rust/pull/39356
5948 [39372]: https://github.com/rust-lang/rust/pull/39372
5949 [39426]: https://github.com/rust-lang/rust/pull/39426
5950 [39431]: https://github.com/rust-lang/rust/pull/39431
5951 [39438]: https://github.com/rust-lang/rust/pull/39438
5952 [39440]: https://github.com/rust-lang/rust/pull/39440
5953 [39485]: https://github.com/rust-lang/rust/pull/39485
5954 [39491]: https://github.com/rust-lang/rust/pull/39491
5955 [39518]: https://github.com/rust-lang/rust/pull/39518
5956 [39538]: https://github.com/rust-lang/rust/pull/39538
5957 [39572]: https://github.com/rust-lang/rust/pull/39572
5958 [39633]: https://github.com/rust-lang/rust/pull/39633
5959 [39642]: https://github.com/rust-lang/rust/pull/39642
5960 [39728]: https://github.com/rust-lang/rust/pull/39728
5961 [39761]: https://github.com/rust-lang/rust/pull/39761
5962 [39788]: https://github.com/rust-lang/rust/pull/39788
5963 [39793]: https://github.com/rust-lang/rust/pull/39793
5964 [39837]: https://github.com/rust-lang/rust/pull/39837
5965 [39843]: https://github.com/rust-lang/rust/pull/39843
5966 [39851]: https://github.com/rust-lang/rust/pull/39851
5967 [39903]: https://github.com/rust-lang/rust/pull/39903
5968 [39939]: https://github.com/rust-lang/rust/pull/39939
5969 [39953]: https://github.com/rust-lang/rust/pull/39953
5970 [39960]: https://github.com/rust-lang/rust/pull/39960
5971 [39990]: https://github.com/rust-lang/rust/pull/39990
5972 [39995]: https://github.com/rust-lang/rust/pull/39995
5973 [40008]: https://github.com/rust-lang/rust/pull/40008
5974 [40009]: https://github.com/rust-lang/rust/pull/40009
5975 [40027]: https://github.com/rust-lang/rust/pull/40027
5976 [40028]: https://github.com/rust-lang/rust/pull/40028
5977 [40037]: https://github.com/rust-lang/rust/pull/40037
5978 [40117]: https://github.com/rust-lang/rust/pull/40117
5979 [40166]: https://github.com/rust-lang/rust/pull/40166
5980 [40245]: https://github.com/rust-lang/rust/pull/40245
5981 [40257]: https://github.com/rust-lang/rust/pull/40257
5982 [40261]: https://github.com/rust-lang/rust/pull/40261
5983 [40265]: https://github.com/rust-lang/rust/pull/40265
5984 [40319]: https://github.com/rust-lang/rust/pull/40319
5985 [40336]: https://github.com/rust-lang/rust/pull/40336
5986 [40526]: https://github.com/rust-lang/rust/pull/40526
5987 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5988 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5989 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5990 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5991 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5992 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5993 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5994 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5995 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5996 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5997 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5998 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5999 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6000 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6001 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6002 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6003 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6004 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6005 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6006 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6007 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6008 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6009 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6010 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6011 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6012 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6013 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6014 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6015 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6016 [mdbook]: https://crates.io/crates/mdbook
6017 [ubook]: https://doc.rust-lang.org/unstable-book/
6020 Version 1.16.0 (2017-03-16)
6021 ===========================
6026 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6027 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6028 match patterns][38069]
6029 * [Clean up semantics of `self` in an import list][38313]
6030 * [`Self` may appear in `impl` headers][38920]
6031 * [`Self` may appear in struct expressions][39282]
6036 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6037 a `.rmeta` file containing only crate metadata][38571]. This can be
6038 used by tools like the Rust Language Service to perform
6039 metadata-only builds.
6040 * [Levenshtein based typo suggestions now work in most places, while
6041 previously they worked only for fields and sometimes for local
6042 variables][38927]. Together with the overhaul of "no
6043 resolution"/"unexpected resolution" errors (#[38154]) they result in
6044 large and systematic improvement in resolution diagnostics.
6045 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6047 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6048 * [`rustc` no longer attempts to provide "consider using an explicit
6049 lifetime" suggestions][37057]. They were inaccurate.
6054 * [`VecDeque::truncate`]
6055 * [`VecDeque::resize`]
6056 * [`String::insert_str`]
6057 * [`Duration::checked_add`]
6058 * [`Duration::checked_sub`]
6059 * [`Duration::checked_div`]
6060 * [`Duration::checked_mul`]
6063 * [`SocketAddr::is_ipv4`]
6064 * [`SocketAddr::is_ipv6`]
6065 * [`IpAddr::is_ipv4`]
6066 * [`IpAddr::is_ipv6`]
6068 * [`Vec::dedup_by_key`]
6069 * [`Result::unwrap_or_default`]
6070 * [`<*const T>::wrapping_offset`]
6071 * [`<*mut T>::wrapping_offset`]
6072 * `CommandExt::creation_flags`
6073 * [`File::set_permissions`]
6074 * [`String::split_off`]
6079 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6080 their argument by `Borrow` parameter][37761]
6081 * [All public types in std implement `Debug`][38006]
6082 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6083 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6084 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6086 * [std: Fix partial writes in `LineWriter`][38062]
6087 * [std: Clamp max read/write sizes on Unix][38062]
6088 * [Use more specific panic message for `&str` slicing errors][38066]
6089 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6090 functionality cannot be achieved in std currently.
6091 * [`writeln!`, like `println!`, now accepts a form with no string
6092 or formatting arguments, to just print a newline][38469]
6093 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6094 * [Reduce the size of static data in `std_unicode::tables`][38781]
6095 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6096 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6098 * [`Duration` implements `Sum`][38712]
6099 * [`String` implements `ToSocketAddrs`][39048]
6104 * [The `cargo check` command does a type check of a project without
6105 building it][cargo/3296]
6106 * [crates.io will display CI badges from Travis and AppVeyor, if
6107 specified in Cargo.toml][cargo/3546]
6108 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6109 * [Compilation profiles accept integer values for `debug`, in addition
6110 to `true` and `false`. These are passed to `rustc` as the value to
6111 `-C debuginfo`][cargo/3534]
6112 * [Implement `cargo --version --verbose`][cargo/3604]
6113 * [All builds now output 'dep-info' build dependencies compatible with
6114 make and ninja][cargo/3557]
6115 * [Build all workspace members with `build --all`][cargo/3511]
6116 * [Document all workspace members with `doc --all`][cargo/3515]
6117 * [Path deps outside workspace are not members][cargo/3443]
6122 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6123 the path to the Rust implementation][38589]
6124 * [The `armv7-linux-androideabi` target no longer enables NEON
6125 extensions, per Google's ABI guide][38413]
6126 * [The stock standard library can be compiled for Redox OS][38401]
6127 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6129 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6131 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6136 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6137 match patterns][38069]
6138 * In this release, references to uninhabited types can not be
6139 pattern-matched. This was accidentally allowed in 1.15.
6140 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6141 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6143 * [Clean up semantics of `self` in an import list][38313]
6144 * Reimplemented lifetime elision. This change was almost entirely compatible
6145 with existing code, but it did close a number of small bugs and loopholes,
6146 as well as being more accepting in some other [cases][41105].
6148 [37057]: https://github.com/rust-lang/rust/pull/37057
6149 [37761]: https://github.com/rust-lang/rust/pull/37761
6150 [38006]: https://github.com/rust-lang/rust/pull/38006
6151 [38051]: https://github.com/rust-lang/rust/pull/38051
6152 [38062]: https://github.com/rust-lang/rust/pull/38062
6153 [38062]: https://github.com/rust-lang/rust/pull/38622
6154 [38066]: https://github.com/rust-lang/rust/pull/38066
6155 [38069]: https://github.com/rust-lang/rust/pull/38069
6156 [38131]: https://github.com/rust-lang/rust/pull/38131
6157 [38154]: https://github.com/rust-lang/rust/pull/38154
6158 [38274]: https://github.com/rust-lang/rust/pull/38274
6159 [38304]: https://github.com/rust-lang/rust/pull/38304
6160 [38313]: https://github.com/rust-lang/rust/pull/38313
6161 [38314]: https://github.com/rust-lang/rust/pull/38314
6162 [38327]: https://github.com/rust-lang/rust/pull/38327
6163 [38401]: https://github.com/rust-lang/rust/pull/38401
6164 [38413]: https://github.com/rust-lang/rust/pull/38413
6165 [38469]: https://github.com/rust-lang/rust/pull/38469
6166 [38559]: https://github.com/rust-lang/rust/pull/38559
6167 [38571]: https://github.com/rust-lang/rust/pull/38571
6168 [38580]: https://github.com/rust-lang/rust/pull/38580
6169 [38589]: https://github.com/rust-lang/rust/pull/38589
6170 [38670]: https://github.com/rust-lang/rust/pull/38670
6171 [38712]: https://github.com/rust-lang/rust/pull/38712
6172 [38726]: https://github.com/rust-lang/rust/pull/38726
6173 [38781]: https://github.com/rust-lang/rust/pull/38781
6174 [38798]: https://github.com/rust-lang/rust/pull/38798
6175 [38909]: https://github.com/rust-lang/rust/pull/38909
6176 [38920]: https://github.com/rust-lang/rust/pull/38920
6177 [38927]: https://github.com/rust-lang/rust/pull/38927
6178 [39048]: https://github.com/rust-lang/rust/pull/39048
6179 [39282]: https://github.com/rust-lang/rust/pull/39282
6180 [39379]: https://github.com/rust-lang/rust/pull/39379
6181 [41105]: https://github.com/rust-lang/rust/issues/41105
6182 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6183 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6184 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6185 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6186 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6187 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6188 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6189 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6190 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6191 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6192 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6193 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6194 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6195 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6196 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6197 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6198 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6199 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6200 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6201 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6202 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6203 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6204 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6205 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6206 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6207 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6208 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6209 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6210 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6211 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6214 Version 1.15.1 (2017-02-09)
6215 ===========================
6217 * [Fix IntoIter::as_mut_slice's signature][39466]
6218 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6220 [39466]: https://github.com/rust-lang/rust/pull/39466
6221 [39523]: https://github.com/rust-lang/rust/pull/39523
6224 Version 1.15.0 (2017-02-02)
6225 ===========================
6230 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6231 stable. This allows popular code-generating crates like Serde and Diesel to
6232 work ergonomically. [RFC 1681].
6233 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6234 with curly braces][36868]. Part of [RFC 1506].
6235 * [A number of minor changes to name resolution have been activated][37127].
6236 They add up to more consistent semantics, allowing for future evolution of
6237 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6238 details of what is different. The breaking changes here have been transitioned
6239 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6240 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6242 * [`?Sized` can be used in `where` clauses][37791]
6243 * [There is now a limit on the size of monomorphized types and it can be
6244 modified with the `#![type_size_limit]` crate attribute, similarly to
6245 the `#![recursion_limit]` attribute][37789]
6250 * [On Windows, the compiler will apply dllimport attributes when linking to
6251 extern functions][37973]. Additional attributes and flags can control which
6252 library kind is linked and its name. [RFC 1717].
6253 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6254 * [The `--test` flag works with procedural macro crates][38107]
6255 * [Fix `extern "aapcs" fn` ABI][37814]
6256 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6257 * [The `format!` expander recognizes incorrect `printf` and shell-style
6258 formatting directives and suggests the correct format][37613].
6259 * [Only report one error for all unused imports in an import list][37456]
6261 Compiler Performance
6262 --------------------
6264 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6265 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6266 * [Don't clone in `UnificationTable::probe`][37848]
6267 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6268 * [Use small vectors in type walker][37760]
6269 * [Macro expansion performance was improved][37701]
6270 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6271 * [Replace FNV with a faster hash function][37229]
6276 * [`std::iter::Iterator::min_by`]
6277 * [`std::iter::Iterator::max_by`]
6278 * [`std::os::*::fs::FileExt`]
6279 * [`std::sync::atomic::Atomic*::get_mut`]
6280 * [`std::sync::atomic::Atomic*::into_inner`]
6281 * [`std::vec::IntoIter::as_slice`]
6282 * [`std::vec::IntoIter::as_mut_slice`]
6283 * [`std::sync::mpsc::Receiver::try_iter`]
6284 * [`std::os::unix::process::CommandExt::before_exec`]
6285 * [`std::rc::Rc::strong_count`]
6286 * [`std::rc::Rc::weak_count`]
6287 * [`std::sync::Arc::strong_count`]
6288 * [`std::sync::Arc::weak_count`]
6289 * [`std::char::encode_utf8`]
6290 * [`std::char::encode_utf16`]
6291 * [`std::cell::Ref::clone`]
6292 * [`std::io::Take::into_inner`]
6297 * [The standard sorting algorithm has been rewritten for dramatic performance
6298 improvements][38192]. It is a hybrid merge sort, drawing influences from
6299 Timsort. Previously it was a naive merge sort.
6300 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6301 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6303 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6304 and `char_indices().last()`][37882]
6305 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6306 * [Chinese characters display correctly in `fmt::Debug`][37855]
6307 * [Derive `Default` for `Duration`][37699]
6308 * [Support creation of anonymous pipes on WinXP/2k][37677]
6309 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6310 * [Don't pass overlapped handles to processes][38835]
6315 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6316 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6317 should instead check the variable at runtime with `std::env`. That the value
6318 was set at build time was a bug, and incorrect when cross-compiling. This
6319 change is known to cause breakage.
6320 * [Add `--all` flag to `cargo test`][cargo/3221]
6321 * [Compile statically against the MSVC CRT][cargo/3363]
6322 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6323 * [Link OpenSSL statically on OSX][cargo/3311]
6324 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6325 * [Test for bad path overrides with summaries][cargo/3336]
6326 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6327 * [Fix retrying crate downloads for network errors][cargo/3348]
6328 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6329 * [Emit more info on --message-format=json][cargo/3319]
6330 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6331 * [Don't ignore errors in workspace manifest][cargo/3409]
6332 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6337 * [Test runners (binaries built with `--test`) now support a `--list` argument
6338 that lists the tests it contains][38185]
6339 * [Test runners now support a `--exact` argument that makes the test filter
6340 match exactly, instead of matching only a substring of the test name][38181]
6341 * [rustdoc supports a `--playground-url` flag][37763]
6342 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6347 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6348 continue to be used in this release by passing `--disable-rustbuild` to the
6349 configure script, but they will be deleted soon. Note that the new build
6350 system uses a different on-disk layout that will likely affect any scripts
6352 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6354 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6355 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6361 * [A number of minor changes to name resolution have been activated][37127].
6362 They add up to more consistent semantics, allowing for future evolution of
6363 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6364 details of what is different. The breaking changes here have been transitioned
6365 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6366 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6367 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6368 should instead check the variable at runtime with `std::env`. That the value
6369 was set at build time was a bug, and incorrect when cross-compiling. This
6370 change is known to cause breakage.
6371 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6372 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6373 1.10 and is now an error by default. It will become a hard error in the near
6375 * [The semantics relating modules to file system directories are changing in
6376 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6377 lint, which is a warning in this release, and will become a hard error in the
6379 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6380 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6381 the underlying iterator][37834]
6383 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6384 [33685]: https://github.com/rust-lang/rust/issues/33685
6385 [36868]: https://github.com/rust-lang/rust/pull/36868
6386 [37127]: https://github.com/rust-lang/rust/pull/37127
6387 [37229]: https://github.com/rust-lang/rust/pull/37229
6388 [37456]: https://github.com/rust-lang/rust/pull/37456
6389 [37527]: https://github.com/rust-lang/rust/pull/37527
6390 [37602]: https://github.com/rust-lang/rust/pull/37602
6391 [37613]: https://github.com/rust-lang/rust/pull/37613
6392 [37615]: https://github.com/rust-lang/rust/pull/37615
6393 [37636]: https://github.com/rust-lang/rust/pull/37636
6394 [37627]: https://github.com/rust-lang/rust/pull/37627
6395 [37642]: https://github.com/rust-lang/rust/pull/37642
6396 [37677]: https://github.com/rust-lang/rust/pull/37677
6397 [37699]: https://github.com/rust-lang/rust/pull/37699
6398 [37701]: https://github.com/rust-lang/rust/pull/37701
6399 [37705]: https://github.com/rust-lang/rust/pull/37705
6400 [37749]: https://github.com/rust-lang/rust/pull/37749
6401 [37760]: https://github.com/rust-lang/rust/pull/37760
6402 [37763]: https://github.com/rust-lang/rust/pull/37763
6403 [37764]: https://github.com/rust-lang/rust/pull/37764
6404 [37789]: https://github.com/rust-lang/rust/pull/37789
6405 [37791]: https://github.com/rust-lang/rust/pull/37791
6406 [37814]: https://github.com/rust-lang/rust/pull/37814
6407 [37817]: https://github.com/rust-lang/rust/pull/37817
6408 [37834]: https://github.com/rust-lang/rust/pull/37834
6409 [37848]: https://github.com/rust-lang/rust/pull/37848
6410 [37855]: https://github.com/rust-lang/rust/pull/37855
6411 [37882]: https://github.com/rust-lang/rust/pull/37882
6412 [37888]: https://github.com/rust-lang/rust/pull/37888
6413 [37973]: https://github.com/rust-lang/rust/pull/37973
6414 [37979]: https://github.com/rust-lang/rust/pull/37979
6415 [38086]: https://github.com/rust-lang/rust/pull/38086
6416 [38107]: https://github.com/rust-lang/rust/pull/38107
6417 [38117]: https://github.com/rust-lang/rust/pull/38117
6418 [38134]: https://github.com/rust-lang/rust/pull/38134
6419 [38146]: https://github.com/rust-lang/rust/pull/38146
6420 [38181]: https://github.com/rust-lang/rust/pull/38181
6421 [38182]: https://github.com/rust-lang/rust/pull/38182
6422 [38185]: https://github.com/rust-lang/rust/pull/38185
6423 [38192]: https://github.com/rust-lang/rust/pull/38192
6424 [38279]: https://github.com/rust-lang/rust/pull/38279
6425 [38835]: https://github.com/rust-lang/rust/pull/38835
6426 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6427 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6428 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6429 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6430 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6431 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6432 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6433 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6434 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6435 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6436 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6437 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6438 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6439 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6440 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6441 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6442 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6443 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6444 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6445 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6446 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6447 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6448 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6449 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6450 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6451 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6452 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6453 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6454 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6455 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6456 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6457 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6458 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6459 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6460 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6461 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6462 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6463 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6466 Version 1.14.0 (2016-12-22)
6467 ===========================
6472 * [`..` matches multiple tuple fields in enum variants, structs
6473 and tuples][36843]. [RFC 1492].
6474 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6475 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6476 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6477 dereferencing][36822]
6482 * [Mark enums with non-zero discriminant as non-zero][37224]
6483 * [Lower-case `static mut` names are linted like other
6484 statics and consts][37162]
6485 * [Fix ICE on some macros in const integer positions
6486 (e.g. `[u8; m!()]`)][36819]
6487 * [Improve error message and snippet for "did you mean `x`"][36798]
6488 * [Add a panic-strategy field to the target specification][36794]
6489 * [Include LLVM version in `--version --verbose`][37200]
6491 Compile-time Optimizations
6492 --------------------------
6494 * [Improve macro expansion performance][37569]
6495 * [Shrink `Expr_::ExprInlineAsm`][37445]
6496 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6497 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6498 * [Avoid more allocations when compiling html5ever][37373]
6499 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6500 * [Avoid some allocations in the macro parser][37318]
6501 * [Use a faster deflate setting][37298]
6502 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6503 during interning of slices][37270]
6504 * [Optimize `write_metadata`][37267]
6505 * [Don't process obligation forest cycles when stalled][37231]
6506 * [Avoid many `CrateConfig` clones][37161]
6507 * [Optimize `Substs::super_fold_with`][37108]
6508 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6509 * [Speed up `plug_leaks`][36917]
6514 * [`println!()`, with no arguments, prints newline][36825].
6515 Previously, an empty string was required to achieve the same.
6516 * [`Wrapping` impls standard binary and unary operators, as well as
6517 the `Sum` and `Product` iterators][37356]
6518 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6520 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6521 `VecDeque` iterators][37315]
6522 * [Improve `SipHasher` performance on small values][37312]
6523 * [Add Iterator trait TrustedLen to enable better FromIterator /
6525 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6526 * [`ReadDir` implements `Debug`][37221]
6527 * [Implement `RefUnwindSafe` for atomic types][37178]
6528 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6529 * [Avoid allocations in `Decoder::read_str`][37064]
6530 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6531 * [Impl `Debug` for raw pointers to unsized data][36880]
6532 * [Don't reuse `HashMap` random seeds][37470]
6533 * [The internal memory layout of `HashMap` is more cache-friendly, for
6534 significant improvements in some operations][36692]
6535 * [`HashMap` uses less memory on 32-bit architectures][36595]
6536 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6541 * [Expose rustc cfg values to build scripts][cargo/3243]
6542 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6543 * [Fix passing --features when testing multiple packages][cargo/3280]
6544 * [Use a single profile set per workspace][cargo/3249]
6545 * [Load `replace` sections from lock files][cargo/3220]
6546 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6551 * [rustup is the recommended Rust installation method][1.14rustup]
6552 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6553 S390x. These are [tier 2] platforms and may have major defects. Follow the
6554 instructions on the website to install, or add the targets to an existing
6555 installation with `rustup target add`. The new target triples are:
6556 - `mips-unknown-linux-gnu`
6557 - `mipsel-unknown-linux-gnu`
6558 - `mips64-unknown-linux-gnuabi64`
6559 - `mips64el-unknown-linux-gnuabi64 `
6560 - `powerpc-unknown-linux-gnu`
6561 - `powerpc64-unknown-linux-gnu`
6562 - `powerpc64le-unknown-linux-gnu`
6563 - `s390x-unknown-linux-gnu `
6564 * This release includes target (std) builds for ARM Linux running MUSL
6565 libc. These are [tier 2] platforms and may have major defects. Add the
6566 following triples to an existing rustup installation with `rustup target add`:
6567 - `arm-unknown-linux-musleabi`
6568 - `arm-unknown-linux-musleabihf`
6569 - `armv7-unknown-linux-musleabihf`
6570 * This release includes [experimental support for WebAssembly][1.14wasm], via
6571 the `wasm32-unknown-emscripten` target. This target is known to have major
6572 defects. Please test, report, and fix.
6573 * rustup no longer installs documentation by default. Run `rustup
6574 component add rust-docs` to install.
6575 * [Fix line stepping in debugger][37310]
6576 * [Enable line number debuginfo in releases][37280]
6581 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6582 * [Add support for Fuchsia OS][37313]
6583 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6588 * [A number of forward-compatibility lints used by the compiler
6589 to gradually introduce language changes have been converted
6590 to deny by default][36894]:
6591 - ["use of inaccessible extern crate erroneously allowed"][36886]
6592 - ["type parameter default erroneously allowed in invalid location"][36887]
6593 - ["detects super or self keywords at the beginning of global path"][36888]
6594 - ["two overlapping inherent impls define an item with the same name
6595 were erroneously allowed"][36889]
6596 - ["floating-point constants cannot be used in patterns"][36890]
6597 - ["constants of struct or enum type can only be used in a pattern if
6598 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6599 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6600 * [Prohibit patterns in trait methods without bodies][37378]
6601 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6602 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6603 * [The `$crate` macro variable is accepted in fewer locations][37213]
6604 * [Impls specifying extra region requirements beyond the trait
6605 they implement are rejected][37167]
6606 * [Enums may not be unsized][37111]. Unsized enums are intended to
6607 work but never have. For now they are forbidden.
6608 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6610 [tier 2]: https://forge.rust-lang.org/platform-support.html
6611 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6612 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6613 [36430]: https://github.com/rust-lang/rust/pull/36430
6614 [36595]: https://github.com/rust-lang/rust/pull/36595
6615 [36595]: https://github.com/rust-lang/rust/pull/36595
6616 [36692]: https://github.com/rust-lang/rust/pull/36692
6617 [36767]: https://github.com/rust-lang/rust/pull/36767
6618 [36794]: https://github.com/rust-lang/rust/pull/36794
6619 [36798]: https://github.com/rust-lang/rust/pull/36798
6620 [36819]: https://github.com/rust-lang/rust/pull/36819
6621 [36822]: https://github.com/rust-lang/rust/pull/36822
6622 [36825]: https://github.com/rust-lang/rust/pull/36825
6623 [36843]: https://github.com/rust-lang/rust/pull/36843
6624 [36880]: https://github.com/rust-lang/rust/pull/36880
6625 [36886]: https://github.com/rust-lang/rust/issues/36886
6626 [36887]: https://github.com/rust-lang/rust/issues/36887
6627 [36888]: https://github.com/rust-lang/rust/issues/36888
6628 [36889]: https://github.com/rust-lang/rust/issues/36889
6629 [36890]: https://github.com/rust-lang/rust/issues/36890
6630 [36891]: https://github.com/rust-lang/rust/issues/36891
6631 [36892]: https://github.com/rust-lang/rust/issues/36892
6632 [36894]: https://github.com/rust-lang/rust/pull/36894
6633 [36917]: https://github.com/rust-lang/rust/pull/36917
6634 [36993]: https://github.com/rust-lang/rust/pull/36993
6635 [37037]: https://github.com/rust-lang/rust/pull/37037
6636 [37064]: https://github.com/rust-lang/rust/pull/37064
6637 [37094]: https://github.com/rust-lang/rust/pull/37094
6638 [37108]: https://github.com/rust-lang/rust/pull/37108
6639 [37111]: https://github.com/rust-lang/rust/pull/37111
6640 [37161]: https://github.com/rust-lang/rust/pull/37161
6641 [37162]: https://github.com/rust-lang/rust/pull/37162
6642 [37167]: https://github.com/rust-lang/rust/pull/37167
6643 [37178]: https://github.com/rust-lang/rust/pull/37178
6644 [37200]: https://github.com/rust-lang/rust/pull/37200
6645 [37213]: https://github.com/rust-lang/rust/pull/37213
6646 [37221]: https://github.com/rust-lang/rust/pull/37221
6647 [37224]: https://github.com/rust-lang/rust/pull/37224
6648 [37230]: https://github.com/rust-lang/rust/pull/37230
6649 [37231]: https://github.com/rust-lang/rust/pull/37231
6650 [37247]: https://github.com/rust-lang/rust/pull/37247
6651 [37267]: https://github.com/rust-lang/rust/pull/37267
6652 [37270]: https://github.com/rust-lang/rust/pull/37270
6653 [37273]: https://github.com/rust-lang/rust/pull/37273
6654 [37280]: https://github.com/rust-lang/rust/pull/37280
6655 [37298]: https://github.com/rust-lang/rust/pull/37298
6656 [37306]: https://github.com/rust-lang/rust/pull/37306
6657 [37310]: https://github.com/rust-lang/rust/pull/37310
6658 [37312]: https://github.com/rust-lang/rust/pull/37312
6659 [37313]: https://github.com/rust-lang/rust/pull/37313
6660 [37315]: https://github.com/rust-lang/rust/pull/37315
6661 [37318]: https://github.com/rust-lang/rust/pull/37318
6662 [37322]: https://github.com/rust-lang/rust/pull/37322
6663 [37326]: https://github.com/rust-lang/rust/pull/37326
6664 [37351]: https://github.com/rust-lang/rust/pull/37351
6665 [37356]: https://github.com/rust-lang/rust/pull/37356
6666 [37367]: https://github.com/rust-lang/rust/pull/37367
6667 [37373]: https://github.com/rust-lang/rust/pull/37373
6668 [37378]: https://github.com/rust-lang/rust/pull/37378
6669 [37389]: https://github.com/rust-lang/rust/pull/37389
6670 [37392]: https://github.com/rust-lang/rust/pull/37392
6671 [37427]: https://github.com/rust-lang/rust/pull/37427
6672 [37439]: https://github.com/rust-lang/rust/pull/37439
6673 [37445]: https://github.com/rust-lang/rust/pull/37445
6674 [37470]: https://github.com/rust-lang/rust/pull/37470
6675 [37569]: https://github.com/rust-lang/rust/pull/37569
6676 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6677 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6678 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6679 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6680 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6681 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6682 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6685 Version 1.13.0 (2016-11-10)
6686 ===========================
6691 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6692 errors, like the `try!` macro, described in [RFC 0243].
6693 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6694 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6695 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6696 * [Fix lifetime rules for 'if' conditions][36029]
6697 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6702 * [Add the `-C link-arg` argument][36574]
6703 * [Remove the old AST-based backend from rustc_trans][35764]
6704 * [Don't enable NEON by default on armv7 Linux][35814]
6705 * [Fix debug line number info for macro expansions][35238]
6706 * [Do not emit "class method" debuginfo for types that are not
6707 DICompositeType][36008]
6708 * [Warn about multiple conflicting #[repr] hints][34623]
6709 * [When sizing DST, don't double-count nested struct prefixes][36351]
6710 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6711 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6712 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6713 * [Expand macros without recursing to avoid stack overflows][36214]
6718 * [Replace macro backtraces with labeled local uses][35702]
6719 * [Improve error message for misplaced doc comments][33922]
6720 * [Buffer unix and lock windows to prevent message interleaving][35975]
6721 * [Update lifetime errors to specifically note temporaries][36171]
6722 * [Special case a few colors for Windows][36178]
6723 * [Suggest `use self` when such an import resolves][36289]
6724 * [Be more specific when type parameter shadows primitive type][36338]
6725 * Many minor improvements
6727 Compile-time Optimizations
6728 --------------------------
6730 * [Compute and cache HIR hashes at beginning][35854]
6731 * [Don't hash types in loan paths][36004]
6732 * [Cache projections in trans][35761]
6733 * [Optimize the parser's last token handling][36527]
6734 * [Only instantiate #[inline] functions in codegen units referencing
6735 them][36524]. This leads to big improvements in cases where crates export
6736 define many inline functions without using them directly.
6737 * [Lazily allocate TypedArena's first chunk][36592]
6738 * [Don't allocate during default HashSet creation][36734]
6745 * [`overflowing_abs`]
6746 * [`RefCell::try_borrow`]
6747 * [`RefCell::try_borrow_mut`]
6752 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6753 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6755 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6756 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6757 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6758 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6759 * [Use arc4rand on FreeBSD][35884]
6760 * [memrchr: Correct aligned offset computation][35969]
6761 * [Improve Demangling of Rust Symbols][36059]
6762 * [Use monotonic time in condition variables][35048]
6763 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6764 * [Implement conversion traits for `char`][35755]
6765 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6766 * [Zero first byte of CString on drop][36264]
6767 * [Inherit overflow checks for sum and product][36372]
6768 * [Add missing Eq implementations][36423]
6769 * [Implement `Debug` for `DirEntry`][36631]
6770 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6772 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6773 * [Implement more traits for `std::io::ErrorKind`][35911]
6774 * [Optimize BinaryHeap bounds checking][36072]
6775 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6776 `extend_with_element`][36355]
6777 * [Fix overflow checking in unsigned pow()][34942]
6782 * This release includes security fixes to both curl and OpenSSL.
6783 * [Fix transitive doctests when panic=abort][cargo/3021]
6784 * [Add --all-features flag to cargo][cargo/3038]
6785 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6786 * [Don't parse the home directory more than once][cargo/3078]
6787 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6788 * [Update OpenSSL to 1.0.2j][cargo/3121]
6789 * [Add license and license_file to cargo metadata output][cargo/3110]
6790 * [Make crates-io registry URL optional in config; ignore all changes to
6791 source.crates-io][cargo/3089]
6792 * [Don't download dependencies from other platforms][cargo/3123]
6793 * [Build transitive dev-dependencies when needed][cargo/3125]
6794 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6795 * [Avoid updating registry when adding existing deps][cargo/3144]
6796 * [Warn about path overrides that won't work][cargo/3136]
6797 * [Use workspaces during `cargo install`][cargo/3146]
6798 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6799 * [Add --message-format flag][cargo/3000]
6800 * [Pass target environment for rustdoc][cargo/3205]
6801 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6802 * [Update curl and curl-sys][cargo/3241]
6803 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6808 * [rustdoc: Add the `--sysroot` argument][36586]
6809 * [rustdoc: Fix a couple of issues with the search results][35655]
6810 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6811 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6812 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6817 * [Remove unmaintained style guide][35124]
6818 * [Add s390x support][36369]
6819 * [Initial work at Haiku OS support][36727]
6820 * [Add mips-uclibc targets][35734]
6821 * [Crate-ify compiler-rt into compiler-builtins][35021]
6822 * [Add rustc version info (git hash + date) to dist tarball][36213]
6823 * Many documentation improvements
6828 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6829 * [Deny (by default) transmuting from fn item types to pointer-sized
6830 types][34923]. Continuing the long transition to zero-sized fn items,
6832 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6834 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6835 * [Fix lifetime rules for 'if' conditions][36029].
6836 * [Inherit overflow checks for sum and product][36372].
6837 * [Forbid user-defined macros named "macro_rules"][36730].
6839 [33922]: https://github.com/rust-lang/rust/pull/33922
6840 [34623]: https://github.com/rust-lang/rust/pull/34623
6841 [34923]: https://github.com/rust-lang/rust/pull/34923
6842 [34942]: https://github.com/rust-lang/rust/pull/34942
6843 [34982]: https://github.com/rust-lang/rust/pull/34982
6844 [35021]: https://github.com/rust-lang/rust/pull/35021
6845 [35048]: https://github.com/rust-lang/rust/pull/35048
6846 [35074]: https://github.com/rust-lang/rust/pull/35074
6847 [35124]: https://github.com/rust-lang/rust/pull/35124
6848 [35234]: https://github.com/rust-lang/rust/pull/35234
6849 [35238]: https://github.com/rust-lang/rust/pull/35238
6850 [35354]: https://github.com/rust-lang/rust/pull/35354
6851 [35559]: https://github.com/rust-lang/rust/pull/35559
6852 [35585]: https://github.com/rust-lang/rust/pull/35585
6853 [35627]: https://github.com/rust-lang/rust/pull/35627
6854 [35655]: https://github.com/rust-lang/rust/pull/35655
6855 [35702]: https://github.com/rust-lang/rust/pull/35702
6856 [35707]: https://github.com/rust-lang/rust/pull/35707
6857 [35728]: https://github.com/rust-lang/rust/pull/35728
6858 [35734]: https://github.com/rust-lang/rust/pull/35734
6859 [35755]: https://github.com/rust-lang/rust/pull/35755
6860 [35761]: https://github.com/rust-lang/rust/pull/35761
6861 [35764]: https://github.com/rust-lang/rust/pull/35764
6862 [35814]: https://github.com/rust-lang/rust/pull/35814
6863 [35854]: https://github.com/rust-lang/rust/pull/35854
6864 [35871]: https://github.com/rust-lang/rust/pull/35871
6865 [35884]: https://github.com/rust-lang/rust/pull/35884
6866 [35911]: https://github.com/rust-lang/rust/pull/35911
6867 [35969]: https://github.com/rust-lang/rust/pull/35969
6868 [35975]: https://github.com/rust-lang/rust/pull/35975
6869 [36004]: https://github.com/rust-lang/rust/pull/36004
6870 [36008]: https://github.com/rust-lang/rust/pull/36008
6871 [36014]: https://github.com/rust-lang/rust/pull/36014
6872 [36029]: https://github.com/rust-lang/rust/pull/36029
6873 [36059]: https://github.com/rust-lang/rust/pull/36059
6874 [36072]: https://github.com/rust-lang/rust/pull/36072
6875 [36101]: https://github.com/rust-lang/rust/pull/36101
6876 [36104]: https://github.com/rust-lang/rust/pull/36104
6877 [36171]: https://github.com/rust-lang/rust/pull/36171
6878 [36173]: https://github.com/rust-lang/rust/pull/36173
6879 [36178]: https://github.com/rust-lang/rust/pull/36178
6880 [36213]: https://github.com/rust-lang/rust/pull/36213
6881 [36214]: https://github.com/rust-lang/rust/pull/36214
6882 [36264]: https://github.com/rust-lang/rust/pull/36264
6883 [36266]: https://github.com/rust-lang/rust/pull/36266
6884 [36289]: https://github.com/rust-lang/rust/pull/36289
6885 [36338]: https://github.com/rust-lang/rust/pull/36338
6886 [36351]: https://github.com/rust-lang/rust/pull/36351
6887 [36355]: https://github.com/rust-lang/rust/pull/36355
6888 [36369]: https://github.com/rust-lang/rust/pull/36369
6889 [36372]: https://github.com/rust-lang/rust/pull/36372
6890 [36423]: https://github.com/rust-lang/rust/pull/36423
6891 [36482]: https://github.com/rust-lang/rust/pull/36482
6892 [36505]: https://github.com/rust-lang/rust/pull/36505
6893 [36524]: https://github.com/rust-lang/rust/pull/36524
6894 [36527]: https://github.com/rust-lang/rust/pull/36527
6895 [36551]: https://github.com/rust-lang/rust/pull/36551
6896 [36574]: https://github.com/rust-lang/rust/pull/36574
6897 [36586]: https://github.com/rust-lang/rust/pull/36586
6898 [36592]: https://github.com/rust-lang/rust/pull/36592
6899 [36631]: https://github.com/rust-lang/rust/pull/36631
6900 [36639]: https://github.com/rust-lang/rust/pull/36639
6901 [36721]: https://github.com/rust-lang/rust/pull/36721
6902 [36727]: https://github.com/rust-lang/rust/pull/36727
6903 [36730]: https://github.com/rust-lang/rust/pull/36730
6904 [36734]: https://github.com/rust-lang/rust/pull/36734
6905 [36754]: https://github.com/rust-lang/rust/pull/36754
6906 [36995]: https://github.com/rust-lang/rust/pull/36995
6907 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6908 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6909 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6910 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6911 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6912 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6913 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6914 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6915 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6916 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6917 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6918 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6919 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6920 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6921 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6922 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6923 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6924 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6925 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6926 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6927 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6928 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6929 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6930 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6931 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6932 [rustup]: https://www.rustup.rs
6933 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6934 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6935 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6936 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6937 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6938 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6939 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6942 Version 1.12.1 (2016-10-20)
6943 ===========================
6948 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6949 * [Confusion with double negation and booleans][36856]
6950 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6951 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6952 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6953 * [Corrupted memory after updated to 1.12][36936]
6954 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6955 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6956 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6958 [36381]: https://github.com/rust-lang/rust/issues/36381
6959 [36856]: https://github.com/rust-lang/rust/issues/36856
6960 [36875]: https://github.com/rust-lang/rust/issues/36875
6961 [36924]: https://github.com/rust-lang/rust/issues/36924
6962 [36926]: https://github.com/rust-lang/rust/issues/36926
6963 [36936]: https://github.com/rust-lang/rust/issues/36936
6964 [37026]: https://github.com/rust-lang/rust/issues/37026
6965 [37112]: https://github.com/rust-lang/rust/issues/37112
6966 [37153]: https://github.com/rust-lang/rust/issues/37153
6969 Version 1.12.0 (2016-09-29)
6970 ===========================
6975 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6976 This translation pass is far simpler than the previous AST->LLVM pass, and
6977 creates opportunities to perform new optimizations directly on the MIR. It
6978 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6979 * [`rustc` presents a new, more readable error format, along with
6980 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6981 Most common editors supporting Rust have been updated to work with it. It was
6982 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6987 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6988 This translation pass is far simpler than the previous AST->LLVM pass, and
6989 creates opportunities to perform new optimizations directly on the MIR. It
6990 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6991 * [Print the Rust target name, not the LLVM target name, with
6992 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6993 * [The computation of `TypeId` is correct in some cases where it was previously
6994 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6995 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6996 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6997 `--print relocation-models`, and `--print code-models` print the available
6998 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6999 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7000 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7001 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7002 These targets produce statically-linked binaries. There are no binary release
7008 * [`rustc` presents a new, more readable error format, along with
7009 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7010 Most common editors supporting Rust have been updated to work with it. It was
7011 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7012 * [In error descriptions, references are now described in plain English,
7013 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7014 * [In error type descriptions, unknown numeric types are named `{integer}` or
7015 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7016 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7021 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7022 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7023 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7024 useful](https://github.com/rust-lang/rust/pull/34908)
7025 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7026 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7027 * [Semicolons are properly required as statement delimiters inside
7028 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7029 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7034 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7035 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7036 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7037 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7038 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7039 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7040 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7041 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7042 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7043 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7044 Both on Unix and Windows.
7045 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7046 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7047 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7048 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7049 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7050 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7051 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7052 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7057 * [The `format!` macro and friends now allow a single argument to be formatted
7058 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7059 * [The lifetime bounds on `[T]::binary_search_by` and
7060 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7061 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7062 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7063 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7064 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7065 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7066 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7067 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7068 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7069 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7070 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7071 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7072 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7073 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7074 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7075 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7076 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7077 * [`mpsc::sync_channel` `Receiver`s return any available message before
7078 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7079 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7080 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7085 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7086 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7087 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7088 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7089 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7090 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7091 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7092 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7093 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7094 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7095 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7096 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7097 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7098 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7099 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7100 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7105 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7106 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7111 * [Test binaries now support a `--test-threads` argument to specify the number
7112 of threads used to run tests, and which acts the same as the
7113 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7114 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7115 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7116 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7117 * [Rust releases now come with source packages that can be installed by rustup
7118 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7119 The resulting source code can be used by tools and IDES, located in the
7120 sysroot under `lib/rustlib/src`.
7125 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7126 * Many minor improvements to the documentation.
7127 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7132 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7133 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7134 * [When formatting strings, if "precision" is specified, the "fill",
7135 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7136 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7139 Version 1.11.0 (2016-08-18)
7140 ===========================
7145 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7146 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7147 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7148 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7153 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7154 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7155 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7156 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7157 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7158 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7159 (in libcore - previously stabilized in libstd)
7160 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7161 (in libcore - previously stabilized in libstd)
7162 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7163 (in libcore - previously stabilized in libstd)
7164 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7165 (in libcore - previously stabilized in libstd)
7166 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7167 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7168 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7169 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7174 * [The `thread_local!` macro supports multiple definitions in a single
7175 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7176 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7177 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7178 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7179 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7180 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7181 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7182 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7187 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7188 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7189 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7190 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7191 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7192 and `-vv` prints warnings for all crates.
7193 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7194 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7195 This provides room for expansion by arbitrary tools.
7196 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7197 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7198 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7199 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7200 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7201 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7202 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7207 * [Caching projections speeds up type check dramatically for some
7208 workloads](https://github.com/rust-lang/rust/pull/33816)
7209 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7210 This hasher is faster, but is believed to provide sufficient
7211 protection from collision attacks.
7212 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7217 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7218 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7219 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7220 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7221 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7226 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7227 * [When emitting debug info, rustc emits frame pointers for closures,
7228 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7229 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7230 * Many more errors have been given error codes and extended
7232 * API documentation continues to be improved, with many new examples
7237 * [rustc no longer hangs when dependencies recursively re-export
7238 submodules](https://github.com/rust-lang/rust/pull/34542)
7239 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7240 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7241 rewritten](https://github.com/rust-lang/rust/pull/33895)
7242 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7243 No targets use this yet, but it works toward AVR support.
7248 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7249 * [The new follow-set rules that place restrictions on `macro_rules!`
7250 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7251 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7252 and has been a warning since 1.10.
7253 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7254 This causes breakage in some corner cases.
7257 Version 1.10.0 (2016-07-07)
7258 ===========================
7263 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7264 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7265 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7266 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7267 * [`panic!` can be converted to a runtime abort with the
7268 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7269 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7270 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7271 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7272 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7273 Note that Cargo does not yet directly support cdylibs.
7278 * `os::windows::fs::OpenOptionsExt::access_mode`
7279 * `os::windows::fs::OpenOptionsExt::share_mode`
7280 * `os::windows::fs::OpenOptionsExt::custom_flags`
7281 * `os::windows::fs::OpenOptionsExt::attributes`
7282 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7283 * `os::unix::fs::OpenOptionsExt::custom_flags`
7284 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7285 * `Default for sync::Weak`
7286 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7287 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7288 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7289 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7290 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7291 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7292 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7293 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7294 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7295 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7296 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7297 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7298 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7299 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7300 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7301 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7302 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7303 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7304 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7305 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7306 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7307 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7308 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7309 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7310 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7311 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7312 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7313 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7314 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7315 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7316 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7317 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7318 * Read/Write/RawFd impls for `UnixStream`
7319 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7320 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7321 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7322 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7323 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7324 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7325 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7326 * RawFd impls for `UnixListener`
7327 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7328 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7329 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7330 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7331 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7332 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7333 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7334 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7335 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7336 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7337 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7338 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7339 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7340 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7341 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7342 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7343 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7344 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7345 * RawFd impls for `UnixDatagram`
7346 * `{BTree,Hash}Map::values_mut`
7347 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7352 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7353 The semantics of this minor method are subtle and probably not what
7355 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7356 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7357 will fall back to `/dev/urandom` temporarily to avoid blocking
7358 during early boot](https://github.com/rust-lang/rust/pull/33086).
7359 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7360 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7361 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7362 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7363 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7364 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7365 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7369 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7370 This controls the runtime behavior of the `panic!` macro
7371 and can be either "unwind" (the default), or "abort".
7372 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7373 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7374 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7375 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7376 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7377 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7378 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7379 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7380 By default they are retried twice, which can be customized with the
7381 `net.retry` value in `.cargo/config`.
7382 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7383 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7384 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7385 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7386 Makes it possible to install multiple crates in parallel.
7387 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7388 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7389 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7390 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7391 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7392 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7397 * [rustc memory usage was reduced by refactoring the context used for
7398 type checking](https://github.com/rust-lang/rust/pull/33425).
7399 * [Speed up creation of `HashMap`s by caching the random keys used
7400 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7401 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7402 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7403 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7404 10x faster than the previous lookup tables.
7405 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7410 * Many incremental improvements to documentation and rustdoc.
7411 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7412 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7413 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7414 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7415 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7416 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7417 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7422 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7423 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7424 * [`std` no longer prints backtraces on platforms where the running
7425 module must be loaded with `env::current_exe`, which can't be relied
7426 on](https://github.com/rust-lang/rust/pull/33554).
7427 * This release includes std binaries for the i586-unknown-linux-gnu,
7428 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7429 i586 target is for old x86 hardware without SSE2, and the armv7
7430 target is for Android running on modern ARM architectures.
7431 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7432 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7433 * [On Unix the runtime aborts by calling `libc::abort` instead of
7434 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7435 * [Rust is now bootstrapped from the previous release of Rust,
7436 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7441 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7442 * [`target_env` for Linux ARM targets is just `gnu`, not
7443 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7444 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7445 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7446 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7447 Affects how macros are parsed.
7448 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7449 * [Feature-gated attributes on macro-generated macro invocations are
7450 now rejected](https://github.com/rust-lang/rust/pull/32791).
7451 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7452 This caused some minor changes to type inference.
7455 Version 1.9.0 (2016-05-26)
7456 ==========================
7461 * The `#[deprecated]` attribute when applied to an API will generate
7462 warnings when used. The warnings may be suppressed with
7463 `#[allow(deprecated)]`. [RFC 1270].
7464 * [`fn` item types are zero sized, and each `fn` names a unique
7465 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7466 `transmute` on a `fn` type will generate a warning for a few cycles,
7467 then will be converted to an error.
7468 * [Field and method resolution understand visibility, so private
7469 fields and methods cannot prevent the proper use of public fields
7470 and methods][1.9fv].
7471 * [The parser considers unicode codepoints in the
7472 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7478 * [`std::panic::catch_unwind`] (renamed from `recover`)
7479 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7480 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7481 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7482 * [`str::is_char_boundary`]
7483 * [`<*const T>::as_ref`]
7484 * [`<*mut T>::as_ref`]
7485 * [`<*mut T>::as_mut`]
7486 * [`AsciiExt::make_ascii_uppercase`]
7487 * [`AsciiExt::make_ascii_lowercase`]
7488 * [`char::decode_utf16`]
7489 * [`char::DecodeUtf16`]
7490 * [`char::DecodeUtf16Error`]
7491 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7492 * [`BTreeSet::take`]
7493 * [`BTreeSet::replace`]
7496 * [`HashSet::replace`]
7498 * [`OsString::with_capacity`]
7499 * [`OsString::clear`]
7500 * [`OsString::capacity`]
7501 * [`OsString::reserve`]
7502 * [`OsString::reserve_exact`]
7503 * [`OsStr::is_empty`]
7505 * [`std::os::unix::thread`]
7508 * [`JoinHandleExt::as_pthread_t`]
7509 * [`JoinHandleExt::into_pthread_t`]
7510 * [`HashSet::hasher`]
7511 * [`HashMap::hasher`]
7512 * [`CommandExt::exec`]
7513 * [`File::try_clone`]
7514 * [`SocketAddr::set_ip`]
7515 * [`SocketAddr::set_port`]
7516 * [`SocketAddrV4::set_ip`]
7517 * [`SocketAddrV4::set_port`]
7518 * [`SocketAddrV6::set_ip`]
7519 * [`SocketAddrV6::set_port`]
7520 * [`SocketAddrV6::set_flowinfo`]
7521 * [`SocketAddrV6::set_scope_id`]
7522 * [`slice::copy_from_slice`]
7523 * [`ptr::read_volatile`]
7524 * [`ptr::write_volatile`]
7525 * [`OpenOptions::create_new`]
7526 * [`TcpStream::set_nodelay`]
7527 * [`TcpStream::nodelay`]
7528 * [`TcpStream::set_ttl`]
7529 * [`TcpStream::ttl`]
7530 * [`TcpStream::set_only_v6`]
7531 * [`TcpStream::only_v6`]
7532 * [`TcpStream::take_error`]
7533 * [`TcpStream::set_nonblocking`]
7534 * [`TcpListener::set_ttl`]
7535 * [`TcpListener::ttl`]
7536 * [`TcpListener::set_only_v6`]
7537 * [`TcpListener::only_v6`]
7538 * [`TcpListener::take_error`]
7539 * [`TcpListener::set_nonblocking`]
7540 * [`UdpSocket::set_broadcast`]
7541 * [`UdpSocket::broadcast`]
7542 * [`UdpSocket::set_multicast_loop_v4`]
7543 * [`UdpSocket::multicast_loop_v4`]
7544 * [`UdpSocket::set_multicast_ttl_v4`]
7545 * [`UdpSocket::multicast_ttl_v4`]
7546 * [`UdpSocket::set_multicast_loop_v6`]
7547 * [`UdpSocket::multicast_loop_v6`]
7548 * [`UdpSocket::set_multicast_ttl_v6`]
7549 * [`UdpSocket::multicast_ttl_v6`]
7550 * [`UdpSocket::set_ttl`]
7551 * [`UdpSocket::ttl`]
7552 * [`UdpSocket::set_only_v6`]
7553 * [`UdpSocket::only_v6`]
7554 * [`UdpSocket::join_multicast_v4`]
7555 * [`UdpSocket::join_multicast_v6`]
7556 * [`UdpSocket::leave_multicast_v4`]
7557 * [`UdpSocket::leave_multicast_v6`]
7558 * [`UdpSocket::take_error`]
7559 * [`UdpSocket::connect`]
7560 * [`UdpSocket::send`]
7561 * [`UdpSocket::recv`]
7562 * [`UdpSocket::set_nonblocking`]
7567 * [`std::sync::Once` is poisoned if its initialization function
7569 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7570 * [Most types implement `fmt::Debug`][1.9db].
7571 * [The default buffer size used by `BufReader` and `BufWriter` was
7572 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7573 used by other languages.
7574 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7575 `Duration` additionally implements `*=` and `/=`][1.9ta].
7576 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7577 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7578 * [`Chain` implements `BufRead`][1.9ch].
7579 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7584 * [Cargo can now run concurrently][1.9cc].
7585 * [Top-level overrides allow specific revisions of crates to be
7586 overridden through the entire crate graph][1.9ct]. This is intended
7587 to make upgrades easier for large projects, by allowing crates to be
7588 forked temporarily until they've been upgraded and republished.
7589 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7590 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7591 on the commandline][1.9cf]. `rustc` arguments can also be specified
7592 in the `build.rustflags` configuration key.
7597 * [The time complexity of comparing variables for equivalence during type
7598 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7599 to major compilation time improvement in some scenarios.
7600 * [`ToString` is specialized for `str`, giving it the same performance
7601 as `to_owned`][1.9ts].
7602 * [Spawning processes with `Command::output` no longer creates extra
7604 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7605 for C-like enums][1.9cl].
7610 * [Passing the `--quiet` flag to a test runner will produce
7611 much-abbreviated output][1.9q].
7612 * The Rust Project now publishes std binaries for the
7613 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7614 `i586-pc-windows-msvc` targets.
7619 * [`std::sync::Once` is poisoned if its initialization function
7621 * [It is illegal to define methods with the same name in overlapping
7622 inherent `impl` blocks][1.9sn].
7623 * [`fn` item types are zero sized, and each `fn` names a unique
7624 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7625 `transmute` on a `fn` type will generate a warning for a few cycles,
7626 then will be converted to an error.
7627 * [Improvements to const evaluation may trigger new errors when integer
7628 literals are out of range][1.9ce].
7631 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7632 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7633 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7634 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7635 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7636 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7637 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7638 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7639 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7640 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7641 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7642 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7643 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7644 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7645 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7646 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7647 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7648 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7649 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7650 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7651 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7652 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7653 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7654 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7655 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7656 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7657 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7658 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7659 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7660 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7661 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7662 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7663 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7664 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7665 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7666 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7667 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7668 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7669 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7670 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7671 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7672 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7673 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7674 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7675 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7676 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7677 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7678 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7679 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7680 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7681 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7682 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7683 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7684 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7685 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7686 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7687 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7688 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7689 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7690 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7691 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7692 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7693 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7694 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7695 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7696 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7697 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7698 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7699 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7700 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7701 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7702 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7703 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7704 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7705 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7706 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7707 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7708 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7709 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7710 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7711 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7712 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7713 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7714 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7715 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7716 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7717 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7718 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7719 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7720 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7721 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7722 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7723 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7724 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7725 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7726 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7727 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7728 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7729 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7730 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7731 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7732 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7733 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7734 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7735 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7736 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7737 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7738 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7739 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7740 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7743 Version 1.8.0 (2016-04-14)
7744 ==========================
7749 * Rust supports overloading of compound assignment statements like
7750 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7751 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7752 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7754 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7755 addition to the non-braced form, `struct Foo;`. [RFC 218].
7761 * [`str::encode_utf16`] (renamed from `utf16_units`)
7762 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7765 * [`ptr::drop_in_place`]
7767 * [`time::SystemTime`]
7769 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7770 * [`Instant::elapsed`]
7771 * [`SystemTime::now`]
7772 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7773 * [`SystemTime::elapsed`]
7774 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7775 * [`SystemTimeError`]
7776 * [`SystemTimeError::duration`]
7777 * Various impls for `SystemTimeError`
7779 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7780 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7781 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7782 * [The `write!` and `writeln!` macros correctly emit errors if any of
7783 their arguments can't be formatted][1.8w].
7784 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7785 * [The Unix-specific `raw` modules, which contain a number of
7786 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7787 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7788 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7789 across platforms was making it difficult to implement `std`
7790 correctly. Those that need these definitions should use the `libc`
7792 * The Unix-specific `MetadataExt` traits, including
7793 `os::unix::fs::MetadataExt`, which expose values such as inode
7794 numbers [no longer return platform-specific types][1.8r], but
7795 instead return widened integers. [RFC 1415].
7796 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7797 * [Atomic loads and stores are not volatile][1.8a].
7798 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7803 * [Inlining hash functions lead to a 3% compile-time improvement in
7804 some workloads][1.8h].
7805 * When using jemalloc, its symbols are [unprefixed so that it
7806 overrides the libc malloc implementation][1.8h]. This means that for
7807 rustc, LLVM is now using jemalloc, which results in a 6%
7808 compile-time improvement on a specific workload.
7809 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7814 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7815 i686-pc-windows-msvc is now considered a tier-1 platform.
7816 * [The `--print targets` flag prints a list of supported targets][1.8t].
7817 * [The `--print cfg` flag prints the `cfg`s defined for the current
7819 * [`rustc` can be built with an new Cargo-based build system, written
7820 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7821 build system. To enable it configure with `configure --rustbuild`.
7822 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7823 variants while also indicating the total number of missing variants
7824 if more than 3][1.8m].
7825 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7826 * The Rust Project now publishes binary releases of the standard
7827 library for a number of tier-2 targets:
7828 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7829 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7830 `x86_64-rumprun-netbsd`. These can be installed with
7831 tools such as [multirust][1.8mr].
7836 * [`cargo init` creates a new Cargo project in the current
7837 directory][1.8ci]. It is otherwise like `cargo new`.
7838 * [Cargo has configuration keys for `-v` and
7839 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7840 `[term]` section of `.cargo/config`.
7841 * [Configuration keys that evaluate to strings or integers can be set
7842 via environment variables][1.8ce]. For example the `build.jobs` key
7843 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7844 precedence over config files.
7845 * [Target-specific dependencies support Rust `cfg` syntax for
7846 describing targets][1.8cfg] so that dependencies for multiple
7847 targets can be specified together. [RFC 1361].
7848 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7849 `RUSTDOC` take precedence over the `build.target-dir`,
7850 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7851 * [The child process tree is killed on Windows when Cargo is
7853 * [The `build.target` configuration value sets the target platform,
7854 like `--target`][1.8ct].
7859 * [Unstable compiler flags have been further restricted][1.8u]. Since
7860 1.0 `-Z` flags have been considered unstable, and other flags that
7861 were considered unstable additionally required passing `-Z
7862 unstable-options` to access. Unlike unstable language and library
7863 features though, these options have been accessible on the stable
7864 release channel. Going forward, *new unstable flags will not be
7865 available on the stable release channel*, and old unstable flags
7866 will warn about their usage. In the future, all unstable flags will
7867 be unavailable on the stable release channel.
7868 * [It is no longer possible to `match` on empty enum variants using
7869 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7870 * The Unix-specific `MetadataExt` traits, including
7871 `os::unix::fs::MetadataExt`, which expose values such as inode
7872 numbers [no longer return platform-specific types][1.8r], but
7873 instead return widened integers. [RFC 1415].
7874 * [Modules sourced from the filesystem cannot appear within arbitrary
7875 blocks, but only within other modules][1.8mf].
7876 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7877 * On Unix, [stack overflow triggers a runtime abort instead of a
7879 * [`Command::spawn` and its equivalents return an error if any of
7880 its command-line arguments contain interior `NUL`s][1.8n].
7881 * [Tuple and unit enum variants from other crates are in the type
7883 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7884 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7885 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7886 instead of `foo.lib`.
7889 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7890 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7891 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7892 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7893 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7894 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7895 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7896 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7897 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7898 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7899 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7900 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7901 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7902 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7903 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7904 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7905 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7906 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7907 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7908 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7909 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7910 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7911 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7912 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7913 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7914 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7915 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7916 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7917 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7918 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7919 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7920 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7921 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7922 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7923 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7924 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7925 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7926 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7927 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7928 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7929 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7930 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7931 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7932 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7933 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7934 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7935 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7936 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7937 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7938 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7939 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7940 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7941 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7942 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7943 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7944 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7945 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7946 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7947 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7948 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7951 Version 1.7.0 (2016-03-03)
7952 ==========================
7959 * [`Path::strip_prefix`] (renamed from relative_from)
7960 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7962 * [`Ipv4Addr::is_loopback`]
7963 * [`Ipv4Addr::is_private`]
7964 * [`Ipv4Addr::is_link_local`]
7965 * [`Ipv4Addr::is_multicast`]
7966 * [`Ipv4Addr::is_broadcast`]
7967 * [`Ipv4Addr::is_documentation`]
7969 * [`Ipv6Addr::is_unspecified`]
7970 * [`Ipv6Addr::is_loopback`]
7971 * [`Ipv6Addr::is_multicast`]
7974 * [`Vec::as_mut_slice`]
7976 * [`String::as_str`]
7977 * [`String::as_mut_str`]
7979 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7981 * `<[T]>::`[`sort_by_key`]
7982 * checked, saturated, and overflowing operations
7983 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7984 * [`i32::saturating_mul`]
7985 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7986 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7987 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7988 * [`u32::saturating_mul`]
7989 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7990 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7991 * and checked, saturated, and overflowing operations for other primitive types
7993 * [`ffi::IntoStringError`]
7994 * [`CString::into_string`]
7995 * [`CString::into_bytes`]
7996 * [`CString::into_bytes_with_nul`]
7997 * `From<CString> for Vec<u8>`
7999 * [`IntoStringError::into_cstring`]
8000 * [`IntoStringError::utf8_error`]
8001 * `Error for IntoStringError`
8003 * [`std::hash::BuildHasher`]
8004 * [`BuildHasher::Hasher`]
8005 * [`BuildHasher::build_hasher`]
8006 * [`std::hash::BuildHasherDefault`]
8007 * [`HashMap::with_hasher`]
8008 * [`HashMap::with_capacity_and_hasher`]
8009 * [`HashSet::with_hasher`]
8010 * [`HashSet::with_capacity_and_hasher`]
8011 * [`std::collections::hash_map::RandomState`]
8012 * [`RandomState::new`]
8013 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8014 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8015 from bytes is faster.
8016 * [The performance of `LineWriter` (and thus `io::stdout`) was
8017 improved by using `memchr` to search for newlines][1.7m].
8018 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8019 `f64` variants were stabilized previously.
8020 * [`BTreeMap` was rewritten to use less memory and improve the performance
8021 of insertion and iteration, the latter by as much as 5x][1.7bm].
8022 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8023 covariant over their contained type][1.7bt].
8024 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8025 over their contained type][1.7ll].
8026 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8028 * [`Any` is implemented for unsized types][1.7a].
8029 * [`Hash` is implemented for `Duration`][1.7h].
8034 * [When running tests with `--test`, rustdoc will pass `--cfg`
8035 arguments to the compiler][1.7dt].
8036 * [The compiler is built with RPATH information by default][1.7rpa].
8037 This means that it will be possible to run `rustc` when installed in
8038 unusual configurations without configuring the dynamic linker search
8040 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8041 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8042 over `LD_LIBRARY_PATH`.
8047 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8048 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8049 * [The `rerun-if-changed` build script directive no longer causes the
8050 build script to incorrectly run twice in certain scenarios][1.7rr].
8055 * Soundness fixes to the interactions between associated types and
8056 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8057 code that violates the new rules. This is a significant change that
8058 is known to break existing code, so it has emitted warnings for the
8059 new error cases since 1.4 to give crate authors time to adapt. The
8060 details of what is changing are subtle; read the RFC for more.
8061 * [Several bugs in the compiler's visibility calculations were
8062 fixed][1.7v]. Since this was found to break significant amounts of
8063 code, the new errors will be emitted as warnings for several release
8064 cycles, under the `private_in_public` lint.
8065 * Defaulted type parameters were accidentally accepted in positions
8066 that were not intended. In this release, [defaulted type parameters
8067 appearing outside of type definitions will generate a
8068 warning][1.7d], which will become an error in future releases.
8069 * [Parsing "." as a float results in an error instead of 0][1.7p].
8070 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8071 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8073 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8074 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8075 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8076 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8077 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8078 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8079 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8080 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8081 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8082 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8083 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8084 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8085 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8086 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8087 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8088 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8089 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8090 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8091 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8092 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8093 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8094 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8095 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8096 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8097 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8098 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8099 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8100 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8101 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8102 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8103 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8104 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8105 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8106 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8107 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8108 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8109 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8110 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8111 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8112 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8113 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8114 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8115 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8116 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8117 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8118 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8119 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8120 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8121 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8122 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8123 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8124 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8125 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8126 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8127 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8128 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8129 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8130 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8131 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8132 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8133 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8134 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8135 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8136 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8137 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8138 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8139 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8140 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8141 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8142 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8143 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8144 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8145 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8146 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8147 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8148 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8149 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8150 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8151 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8154 Version 1.6.0 (2016-01-21)
8155 ==========================
8160 * The `#![no_std]` attribute causes a crate to not be linked to the
8161 standard library, but only the [core library][1.6co], as described
8162 in [RFC 1184]. The core library defines common types and traits but
8163 has no platform dependencies whatsoever, and is the basis for Rust
8164 software in environments that cannot support a full port of the
8165 standard library, such as operating systems. Most of the core
8166 library is now stable.
8172 [`Read::read_exact`],
8173 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8174 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8175 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8176 [`os::unix::fs::DirBuilderExt`],
8177 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8178 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8179 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8180 [`collections::hash_map::Drain`],
8181 [`collections::hash_map::HashMap::drain`],
8182 [`collections::hash_set::Drain`],
8183 [`collections::hash_set::HashSet::drain`],
8184 [`collections::binary_heap::Drain`],
8185 [`collections::binary_heap::BinaryHeap::drain`],
8186 [`Vec::extend_from_slice`] (renamed from `push_all`),
8187 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8188 [`RwLock::into_inner`],
8189 [`Iterator::min_by_key`] (renamed from `min_by`),
8190 [`Iterator::max_by_key`] (renamed from `max_by`).
8191 * The [core library][1.6co] is stable, as are most of its APIs.
8192 * [The `assert_eq!` macro supports arguments that don't implement
8193 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8195 * Several timer functions that take duration in milliseconds [are
8196 deprecated in favor of those that take `Duration`][1.6ms]. These
8197 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8198 `thread::park_timeout_ms`.
8199 * The algorithm by which `Vec` reserves additional elements was
8200 [tweaked to not allocate excessive space][1.6a] while still growing
8202 * `From` conversions are [implemented from integers to floats][1.6f]
8203 in cases where the conversion is lossless. Thus they are not
8204 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8205 or `f64`. They are also not implemented for `isize` and `usize`
8206 because the implementations would be platform-specific. `From` is
8207 also implemented from `f32` to `f64`.
8208 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8209 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8210 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8211 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8213 * Sorting slices that are already sorted [is 50% faster in some
8219 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8220 * Cargo build scripts can specify their dependencies by emitting the
8221 [`rerun-if-changed`][1.6rr] key.
8222 * crates.io will reject publication of crates with dependencies that
8223 have a wildcard version constraint. Crates with wildcard
8224 dependencies were seen to cause a variety of problems, as described
8225 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8227 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8228 release folder. A variety of artifacts that Cargo failed to clean
8229 are now correctly deleted.
8234 * The `unreachable_code` lint [warns when a function call's argument
8236 * The parser indicates [failures that may be caused by
8237 confusingly-similar Unicode characters][1.6uc]
8238 * Certain macro errors [are reported at definition time][1.6m], not
8244 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8245 environment variable when locating crates. This was a pre-cargo
8246 feature for integrating with the package manager that was
8247 accidentally never removed.
8248 * [A number of bugs were fixed in the privacy checker][1.6p] that
8249 could cause previously-accepted code to break.
8250 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8251 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8252 struct pattern syntax (`Foo(..)`) can no longer be used to match
8253 unit structs. This is a warning now, but will become an error in
8254 future releases. Patterns that share the same name as a const are
8256 * A bug was fixed that causes [rustc not to apply default type
8257 parameters][1.6xc] when resolving certain method implementations of
8258 traits defined in other crates.
8260 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8261 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8262 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8263 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8264 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8265 [1.6co]: http://doc.rust-lang.org/core/index.html
8266 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8267 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8268 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8269 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8270 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8271 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8272 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8273 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8274 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8275 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8276 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8277 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8278 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8279 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8280 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8281 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8282 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8283 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8284 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8285 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8286 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8287 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8288 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8289 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8290 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8291 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8292 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8293 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8294 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8295 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8296 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8297 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8298 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8299 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8300 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8301 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8302 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8303 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8304 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8305 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8306 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8309 Version 1.5.0 (2015-12-10)
8310 ==========================
8312 * ~700 changes, numerous bugfixes
8318 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8319 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8320 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8321 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8322 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8323 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8324 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8325 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8326 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8327 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8328 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8329 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8330 [`Path::read_link`], [`Path::symlink_metadata`],
8331 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8332 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8333 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8334 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8335 [`slice::split_first_mut`], [`slice::split_first`],
8336 [`slice::split_last_mut`], [`slice::split_last`],
8337 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8338 [`str::MatchIndices`], [`str::RMatchIndices`],
8339 [`str::match_indices`], [`str::rmatch_indices`],
8340 [`str::slice_mut_unchecked`], [`string::ParseError`].
8341 * Rust applications hosted on crates.io can be installed locally to
8342 `~/.cargo/bin` with the [`cargo install`] command. Among other
8343 things this makes it easier to augment Cargo with new subcommands:
8344 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8345 invoked as `cargo foo`.
8346 * Crates with wildcard (`*`) dependencies will [emit warnings when
8347 published][1.5w]. In 1.6 it will no longer be possible to publish
8348 crates with wildcard dependencies.
8353 * The rules determining when a particular lifetime must outlive
8354 a particular value (known as '[dropck]') have been [modified
8355 to not rely on parametricity][1.5p].
8356 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8357 and `Arc`][1.5a]. Because these smart pointer types implement
8358 `Deref`, this causes breakage in cases where the interior type
8359 contains methods of the same name.
8360 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8361 that they could drop their content. Soundness fix.
8362 * All method invocations are [properly checked][1.5wf1] for
8363 [well-formedness][1.5wf2]. Soundness fix.
8364 * Traits whose supertraits contain `Self` are [not object
8365 safe][1.5o]. Soundness fix.
8366 * Target specifications support a [`no_default_libraries`][1.5nd]
8367 setting that controls whether `-nodefaultlibs` is passed to the
8368 linker, and in turn the `is_like_windows` setting no longer affects
8369 the `-nodefaultlibs` flag.
8370 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8371 * The `#[inline]` and `#[repr]` attributes [can only appear
8372 in valid locations][1.5at].
8373 * Native libraries linked from the local crate are [passed to
8374 the linker before native libraries from upstream crates][1.5nl].
8375 * Two rarely-used attributes, `#[no_debug]` and
8376 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8377 * Negation of unsigned integers, which has been a warning for
8378 several releases, [is now behind a feature gate and will
8379 generate errors][1.5nu].
8380 * The parser accidentally accepted visibility modifiers on
8381 enum variants, a bug [which has been fixed][1.5ev].
8382 * [A bug was fixed that allowed `use` statements to import unstable
8388 * When evaluating expressions at compile-time that are not
8389 compile-time constants (const-evaluating expressions in non-const
8390 contexts), incorrect code such as overlong bitshifts and arithmetic
8391 overflow will [generate a warning instead of an error][1.5ce],
8392 delaying the error until runtime. This will allow the
8393 const-evaluator to be expanded in the future backwards-compatibly.
8394 * The `improper_ctypes` lint [no longer warns about using `isize` and
8395 `usize` in FFI][1.5ict].
8400 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8402 * `Default` is [implemented for mutable slices][1.5d].
8403 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8404 * There are now `From` conversions [between floating point
8405 types][1.5f] where the conversions are lossless.
8406 * There are now `From` conversions [between integer types][1.5i] where
8407 the conversions are lossless.
8408 * [`fs::Metadata` implements `Clone`][1.5fs].
8409 * The `parse` method [accepts a leading "+" when parsing
8411 * [`AsMut` is implemented for `Vec`][1.5am].
8412 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8413 been optimized][1.5cf] and no longer rely on the default impl.
8414 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8415 `unsafe extern "C"` function types now [implement `Clone`,
8416 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8417 `fmt::Debug` for up to 12 arguments][1.5fp].
8418 * [Dropping `Vec`s is much faster in unoptimized builds when the
8419 element types don't implement `Drop`][1.5dv].
8420 * A bug that caused in incorrect behavior when [combining `VecDeque`
8421 with zero-sized types][1.5vdz] was resolved.
8422 * [`PartialOrd` for slices is faster][1.5po].
8427 * [Crate metadata size was reduced by 20%][1.5md].
8428 * [Improvements to code generation reduced the size of libcore by 3.3
8429 MB and rustc's memory usage by 18MB][1.5m].
8430 * [Improvements to deref translation increased performance in
8431 unoptimized builds][1.5dr].
8432 * Various errors in trait resolution [are deduplicated to only be
8433 reported once][1.5te].
8434 * Rust has preliminary [support for rumprun kernels][1.5rr].
8435 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8437 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8438 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8439 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8440 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8441 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8442 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8443 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8444 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8445 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8446 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8447 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8448 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8449 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8450 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8451 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8452 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8453 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8454 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8455 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8456 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8457 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8458 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8459 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8460 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8461 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8462 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8463 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8464 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8465 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8466 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8467 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8468 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8469 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8470 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8471 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8472 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8473 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8474 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8475 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8476 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8477 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8478 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8479 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8480 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8481 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8482 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8483 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8484 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8485 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8486 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8487 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8488 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8489 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8490 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8491 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8492 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8493 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8494 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8495 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8496 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8497 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8498 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8499 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8500 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8501 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8502 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8503 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8504 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8505 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8506 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8507 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8508 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8509 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8510 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8511 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8512 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8513 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8514 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8515 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8516 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8517 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8518 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8519 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8520 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8521 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8522 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8523 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8524 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8525 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8527 Version 1.4.0 (2015-10-29)
8528 ==========================
8530 * ~1200 changes, numerous bugfixes
8535 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8536 GNU) are now supported and recommended for use.
8541 * [Several changes have been made to fix type soundness and improve
8542 the behavior of associated types][sound]. See [RFC 1214]. Although
8543 we have mostly introduced these changes as warnings this release, to
8544 become errors next release, there are still some scenarios that will
8545 see immediate breakage.
8546 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8547 line breaks in addition to `\n`][crlf].
8548 * [Loans of `'static` lifetime extend to the end of a function][stat].
8549 * [`str::parse` no longer introduces avoidable rounding error when
8550 parsing floating point numbers. Together with earlier changes to
8551 float formatting/output, "round trips" like f.to_string().parse()
8552 now preserve the value of f exactly. Additionally, leading plus
8553 signs are now accepted][fp3].
8559 * `use` statements that import multiple items [can now rename
8560 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8561 * [Binops work correctly on fat pointers][binfat].
8562 * `pub extern crate`, which does not behave as expected, [issues a
8563 warning][pec] until a better solution is found.
8568 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8569 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8570 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8571 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8572 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8573 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8574 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8575 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8576 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8577 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8578 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8579 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8580 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8581 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8582 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8583 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8584 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8585 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8587 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8588 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8589 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8590 `f64::from_str_radix`.
8591 * [Reverse-searching strings is faster with the 'two-way'
8593 * [`std::io::copy` allows `?Sized` arguments][cc].
8594 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8595 [override `count`, `nth` and `last` with an *O*(1)
8596 implementation][it].
8597 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8598 * [`IntoRawFd` has been added to the Unix-specific prelude,
8599 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8601 * [`Extend<String>` and `FromIterator<String` are both implemented for
8603 * [`IntoIterator` is implemented for references to `Option` and
8605 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8606 Copy`][ext] as part of [RFC 839]. This will cause type inference
8607 breakage in rare situations.
8608 * [`BinaryHeap` implements `Debug`][bh2].
8609 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8611 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8612 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8613 * [String comparison is faster][faststr].
8614 * `&mut T` where `T: std::fmt::Write` [also implements
8615 `std::fmt::Write`][mutw].
8616 * [A stable regression in `VecDeque::push_back` and other
8617 capacity-altering methods that caused panics for zero-sized types
8619 * [Function pointers implement traits for up to 12 parameters][fp2].
8624 * The compiler [no longer uses the 'morestack' feature to prevent
8625 stack overflow][mm]. Instead it uses guard pages and stack
8626 probes (though stack probes are not yet implemented on any platform
8628 * [The compiler matches traits faster when projections are involved][p].
8629 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8631 * [Cargo now displays useful information about what its doing during
8632 `cargo update`][cu].
8634 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8635 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8636 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8637 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8638 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8639 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8640 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8641 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8642 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8643 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8644 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8645 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8646 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8647 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8648 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8649 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8650 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8651 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8652 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8653 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8654 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8655 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8656 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8657 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8658 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8659 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8660 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8661 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8662 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8663 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8664 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8665 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8666 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8667 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8668 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8669 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8670 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8671 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8672 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8673 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8674 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8675 [bh2]: https://github.com/rust-lang/rust/pull/28156
8676 [binfat]: https://github.com/rust-lang/rust/pull/28270
8677 [bm]: https://github.com/rust-lang/rust/pull/28197
8678 [cc]: https://github.com/rust-lang/rust/pull/27531
8679 [crlf]: https://github.com/rust-lang/rust/pull/28034
8680 [cu]: https://github.com/rust-lang/cargo/pull/1931
8681 [d]: https://github.com/rust-lang/rust/pull/27825
8682 [dep]: https://github.com/rust-lang/rust/pull/28339
8683 [es]: https://github.com/rust-lang/rust/pull/27956
8684 [ext]: https://github.com/rust-lang/rust/pull/28094
8685 [faststr]: https://github.com/rust-lang/rust/pull/28338
8686 [ffi]: https://github.com/rust-lang/rust/pull/28779
8687 [fp]: https://github.com/rust-lang/rust/pull/28268
8688 [fp2]: https://github.com/rust-lang/rust/pull/28560
8689 [fp3]: https://github.com/rust-lang/rust/pull/27307
8690 [i]: https://github.com/rust-lang/rust/pull/27451
8691 [into2]: https://github.com/rust-lang/rust/pull/28039
8692 [it]: https://github.com/rust-lang/rust/pull/27652
8693 [mm]: https://github.com/rust-lang/rust/pull/27338
8694 [mutw]: https://github.com/rust-lang/rust/pull/28368
8695 [sound]: https://github.com/rust-lang/rust/pull/27641
8696 [p]: https://github.com/rust-lang/rust/pull/27866
8697 [pec]: https://github.com/rust-lang/rust/pull/28486
8698 [pr]: https://github.com/rust-lang/rust/pull/27896
8699 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8700 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8701 [s]: https://github.com/rust-lang/rust/pull/27474
8702 [stab]: https://github.com/rust-lang/rust/pull/28339
8703 [stat]: https://github.com/rust-lang/rust/pull/28321
8704 [vd]: https://github.com/rust-lang/rust/pull/28494
8706 Version 1.3.0 (2015-09-17)
8707 ==============================
8709 * ~900 changes, numerous bugfixes
8714 * The [new object lifetime defaults][nold] have been [turned
8715 on][nold2] after a cycle of warnings about the change. Now types
8716 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8717 being interpreted as `&'a Box<Trait+'a>` to `&'a
8718 Box<Trait+'static>`.
8719 * [The Rustonomicon][nom] is a new book in the official documentation
8720 that dives into writing unsafe Rust.
8721 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8722 timekeeping is employed by other std APIs, as well as out-of-tree
8728 * The [new object lifetime defaults][nold] have been [turned
8729 on][nold2] after a cycle of warnings about the change.
8730 * There is a known [regression][lr] in how object lifetime elision is
8731 interpreted, the proper solution for which is undetermined.
8732 * The `#[prelude_import]` attribute, an internal implementation
8733 detail, was accidentally stabilized previously. [It has been put
8734 behind the `prelude_import` feature gate][pi]. This change is
8735 believed to break no existing code.
8736 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8737 [more sane for dynamically sized types][dst3]. Code that relied on
8738 the previous behavior is thought to be broken.
8739 * The `dropck` rules, which checks that destructors can't access
8740 destroyed values, [have been updated][dropck] to match the
8741 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8742 cause some previously-compiling code to no longer build.
8747 * The [new object lifetime defaults][nold] have been [turned
8748 on][nold2] after a cycle of warnings about the change.
8749 * Semicolons may [now follow types and paths in
8750 macros](https://github.com/rust-lang/rust/pull/27000).
8751 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8752 [more sane for dynamically sized types][dst3]. Code that relied on
8753 the previous behavior is not known to exist, and suspected to be
8755 * `'static` variables [may now be recursive][st].
8756 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8757 implementations correctly.
8758 * The `dropck` rules, which checks that destructors can't access
8759 destroyed values, [have been updated][dropck] to match the
8765 * The [`Duration`] API, [has been stabilized][ds], as well as the
8766 `std::time` module, which presently contains only `Duration`.
8767 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8768 * The owned C string, [`CString`], implements [`Borrow`] and the
8769 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8770 these allow C strings to be borrowed and cloned in generic code.
8771 * [`CStr`] implements [`Debug`].
8772 * [`AtomicPtr`] implements [`Debug`].
8773 * [`Error`] trait objects [can be downcast to their concrete types][e]
8774 in many common configurations, using the [`is`], [`downcast`],
8775 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8777 * Searching for substrings now [employs the two-way algorithm][search]
8778 instead of doing a naive search. This gives major speedups to a
8779 number of methods, including [`contains`][sc], [`find`][sf],
8780 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8781 [`ends_with`][sew] are also faster.
8782 * The performance of `PartialEq` for slices is [much faster][ps].
8783 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8784 is overridden and optimized by the implementations for scalars.
8785 * The [`Hasher`] trait now has a number of specialized `write_*`
8786 methods for primitive types, for efficiency.
8787 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8788 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8789 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8790 of [`std::error::Error::cause`][iec] also delegates to the inner
8792 * [`process::Child`][pc] gained the [`id`] method, which returns a
8793 `u32` representing the platform-specific process identifier.
8794 * The [`connect`] method on slices is deprecated, replaced by the new
8795 [`join`] method (note that both of these are on the *unstable*
8796 [`SliceConcatExt`] trait, but through the magic of the prelude are
8797 available to stable code anyway).
8798 * The [`Div`] operator is implemented for [`Wrapping`] types.
8799 * [`DerefMut` is implemented for `String`][dms].
8800 * Performance of SipHash (the default hasher for `HashMap`) is
8801 [better for long data][sh].
8802 * [`AtomicPtr`] implements [`Send`].
8803 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8804 are now [specialized to use uninitialized buffers for increased
8806 * Lifetime parameters of foreign functions [are now resolved
8812 * Rust can now, with some coercion, [produce programs that run on
8813 Windows XP][xp], though XP is not considered a supported platform.
8814 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8815 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8816 recommended for use in 1.3, though should be fully-functional
8817 in the [64-bit 1.4 beta][b14].
8818 * On Fedora-based systems installation will [properly configure the
8819 dynamic linker][fl].
8820 * The compiler gained many new extended error descriptions, which can
8821 be accessed with the `--explain` flag.
8822 * The `dropck` pass, which checks that destructors can't access
8823 destroyed values, [has been rewritten][dropck]. This fixes some
8824 soundness holes, and as such will cause some previously-compiling
8825 code to no longer build.
8826 * `rustc` now uses [LLVM to write archive files where possible][ar].
8827 Eventually this will eliminate the compiler's dependency on the ar
8829 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8830 supported FreeBSD on x86_64).
8831 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8832 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8834 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8835 will kill the process instead of leaking][nlp].
8837 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8838 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8839 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8840 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8841 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8842 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8843 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8844 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8845 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8846 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8847 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8848 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8849 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8850 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8851 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8852 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8853 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8854 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8855 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8856 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8857 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8858 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8859 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8860 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8861 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8862 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8863 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8864 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8865 [ar]: https://github.com/rust-lang/rust/pull/26926
8866 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8867 [dms]: https://github.com/rust-lang/rust/pull/26241
8868 [dropck]: https://github.com/rust-lang/rust/pull/27261
8869 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8870 [ds]: https://github.com/rust-lang/rust/pull/26818
8871 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8872 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8873 [dst3]: https://github.com/rust-lang/rust/pull/27351
8874 [e]: https://github.com/rust-lang/rust/pull/24793
8875 [f]: https://github.com/rust-lang/rust/pull/26588
8876 [fb]: https://github.com/rust-lang/rust/pull/26959
8877 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8878 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8879 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8880 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8881 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8882 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8883 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8884 [lic]: https://github.com/rust-lang/rust/pull/26583
8885 [lnu]: https://github.com/rust-lang/rust/pull/27026
8886 [lr]: https://github.com/rust-lang/rust/issues/27248
8887 [lum]: https://github.com/rust-lang/rust/pull/26378
8888 [lur]: https://github.com/rust-lang/rust/pull/26783
8889 [nlp]: https://github.com/rust-lang/rust/pull/27176
8890 [nold2]: https://github.com/rust-lang/rust/pull/27045
8891 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8892 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8893 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8894 [pi]: https://github.com/rust-lang/rust/pull/26699
8895 [ps]: https://github.com/rust-lang/rust/pull/26884
8896 [rte]: https://github.com/rust-lang/rust/pull/26950
8897 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8898 [search]: https://github.com/rust-lang/rust/pull/26327
8899 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8900 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8901 [sh]: https://github.com/rust-lang/rust/pull/27280
8902 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8903 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8904 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8905 [st]: https://github.com/rust-lang/rust/pull/26630
8906 [win1]: https://github.com/rust-lang/rust/pull/26569
8907 [win2]: https://github.com/rust-lang/rust/pull/26741
8908 [win3]: https://github.com/rust-lang/rust/pull/26741
8909 [win4]: https://github.com/rust-lang/rust/pull/27210
8910 [xp]: https://github.com/rust-lang/rust/pull/26569
8912 Version 1.2.0 (2015-08-07)
8913 ==========================
8915 * ~1200 changes, numerous bugfixes
8920 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8921 like `Rc` to contain types without a fixed size, arrays and trait
8922 objects, finally enabling use of `Rc<[T]>` and completing the
8923 implementation of DST.
8924 * [Parallel codegen][parcodegen] is now working again, which can
8925 substantially speed up large builds in debug mode; It also gets
8926 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8927 jobs). It's not enabled by default, but will be "in the near
8928 future". It can be activated with the `-C codegen-units=N` flag to
8930 * This is the first release with [experimental support for linking
8931 with the MSVC linker and lib C on Windows (instead of using the GNU
8932 variants via MinGW)][win]. It is yet recommended only for the most
8933 intrepid Rustaceans.
8934 * Benchmark compilations are showing a 30% improvement in
8935 bootstrapping over 1.1.
8940 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8941 unicode case mapping, which is a previously-planned change in
8942 behavior and considered a bugfix.
8943 * [`mem::align_of`] now specifies [the *minimum alignment* for
8944 T][align], which is usually the alignment programs are interested
8945 in, and the same value reported by clang's
8946 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8948 * [The `#[packed]` attribute is no longer silently accepted by the
8949 compiler][packed]. This attribute did nothing and code that
8950 mentioned it likely did not work as intended.
8951 * Associated type defaults are [now behind the
8952 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8953 defaults *did not work*, but could be mentioned syntactically. As
8954 such this breakage has minimal impact.
8959 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8960 matching against dereferenceable values.
8965 * The [`Extend`] trait, which grows a collection from an iterator, is
8966 implemented over iterators of references, for `String`, `Vec`,
8967 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8968 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8969 * The [`iter::once`] function returns an iterator that yields a single
8970 element, and [`iter::empty`] returns an iterator that yields no
8972 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8973 over substring matches.
8974 * [`Cell`] and [`RefCell`] both implement `Eq`.
8975 * A number of methods for wrapping arithmetic are added to the
8976 integral types, [`wrapping_div`], [`wrapping_rem`],
8977 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8978 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8979 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8980 type.. It is illegal for the default arithmetic operations in Rust
8981 to overflow; the desire to wrap must be explicit.
8982 * The `{:#?}` formatting specifier [displays the alternate,
8983 pretty-printed][debugfmt] form of the `Debug` formatter. This
8984 feature was actually introduced prior to 1.0 with little
8986 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8987 for writing data to formatted strings, similar to [`io::Write`].
8988 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8989 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8990 are used by code generators to emit implementations of [`Debug`].
8991 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8992 methods that convert case, following Unicode case mapping.
8993 * It is now easier to handle poisoned locks. The [`PoisonError`]
8994 type, returned by failing lock operations, exposes `into_inner`,
8995 `get_ref`, and `get_mut`, which all give access to the inner lock
8996 guard, and allow the poisoned lock to continue to operate. The
8997 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8998 poisoned lock without attempting to take the lock.
8999 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9000 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9001 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9002 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9004 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9010 * `rustc` employs smarter heuristics for guessing at [typos].
9011 * `rustc` emits more efficient code for [no-op conversions between
9012 unsafe pointers][nop].
9013 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9014 resulting in faster compile times and smaller code.
9016 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9017 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9018 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9019 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9020 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9021 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9022 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9023 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9024 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9025 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9026 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9027 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9028 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9029 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9030 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9031 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9032 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9033 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9034 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9035 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9036 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9037 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9038 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9039 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9040 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9041 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9042 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9043 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9044 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9045 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9046 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9047 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9048 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9049 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9050 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9051 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9052 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9053 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9054 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9055 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9056 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9057 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9058 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9059 [align]: https://github.com/rust-lang/rust/pull/25646
9060 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9061 [typos]: https://github.com/rust-lang/rust/pull/26087
9062 [nop]: https://github.com/rust-lang/rust/pull/26336
9063 [fat]: https://github.com/rust-lang/rust/pull/26411
9064 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9065 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9066 [packed]: https://github.com/rust-lang/rust/pull/25541
9067 [ad]: https://github.com/rust-lang/rust/pull/27382
9068 [win]: https://github.com/rust-lang/rust/pull/25350
9070 Version 1.1.0 (2015-06-25)
9071 =========================
9073 * ~850 changes, numerous bugfixes
9078 * The [`std::fs` module has been expanded][fs] to expand the set of
9079 functionality exposed:
9080 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9081 don't incur a syscall on some platforms.
9082 * A `symlink_metadata` function has been added.
9083 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9084 access to all underlying information.
9085 * The compiler now contains extended explanations of many errors. When an error
9086 with an explanation occurs the compiler suggests using the `--explain` flag
9087 to read the explanation. Error explanations are also [available online][err-index].
9088 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9089 well as other work, the time to bootstrap the compiler decreased by
9095 * The [`str::split_whitespace`] method splits a string on unicode
9096 whitespace boundaries.
9097 * On both Windows and Unix, new extension traits provide conversion of
9098 I/O types to and from the underlying system handles. On Unix, these
9099 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9100 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9101 `TcpListener`, and `UpdSocket`. Further implementations for
9102 `std::process` will be stabilized later.
9103 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9104 Windows, symlinks can be created with
9105 `std::os::windows::symlink_dir` and
9106 `std::os::windows::symlink_file`.
9107 * The `mpsc::Receiver` type can now be converted into an iterator with
9108 `into_iter` on the [`IntoIterator`] trait.
9109 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9110 implementation of the [`From`] trait.
9111 * The `Debug` implementation for `RangeFull` [creates output that is
9112 more consistent with other implementations][rf].
9113 * [`Debug` is implemented for `File`][file].
9114 * The `Default` implementation for `Arc` [no longer requires `Sync +
9116 * [The `Iterator` methods `count`, `nth`, and `last` have been
9117 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9118 * Incorrect handling of paths on Windows has been improved in both the
9119 compiler and the standard library.
9120 * [`AtomicPtr` gained a `Default` implementation][ap].
9121 * In accordance with Rust's policy on arithmetic overflow `abs` now
9122 [panics on overflow when debug assertions are enabled][abs].
9123 * The [`Cloned`] iterator, which was accidentally left unstable for
9124 1.0 [has been stabilized][c].
9125 * The [`Incoming`] iterator, which iterates over incoming TCP
9126 connections, and which was accidentally unnamable in 1.0, [is now
9127 properly exported][inc].
9128 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9129 `sift_up` or `sift_down` panic][bh].
9130 * The [`split_off`] method of `LinkedList` [no longer corrupts
9131 the list in certain scenarios][ll].
9136 * Type checking performance [has improved notably][sk] with
9137 [multiple improvements][pre].
9138 * The compiler [suggests code changes][ch] for more errors.
9139 * rustc and it's build system have experimental support for [building
9140 toolchains against MUSL][m] instead of glibc on Linux.
9141 * The compiler defines the `target_env` cfg value, which is used for
9142 distinguishing toolchains that are otherwise for the same
9143 platform. Presently this is set to `gnu` for common GNU Linux
9144 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9145 * The [`cargo rustc`][crc] command invokes a build with custom flags
9147 * [Android executables are always position independent][pie].
9148 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9151 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9152 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9153 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9154 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9155 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9156 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9157 [rf]: https://github.com/rust-lang/rust/pull/24491
9158 [err-index]: https://doc.rust-lang.org/error-index.html
9159 [sk]: https://github.com/rust-lang/rust/pull/24615
9160 [pre]: https://github.com/rust-lang/rust/pull/25323
9161 [file]: https://github.com/rust-lang/rust/pull/24598
9162 [ch]: https://github.com/rust-lang/rust/pull/24683
9163 [arc]: https://github.com/rust-lang/rust/pull/24695
9164 [si]: https://github.com/rust-lang/rust/pull/24701
9165 [ap]: https://github.com/rust-lang/rust/pull/24834
9166 [m]: https://github.com/rust-lang/rust/pull/24777
9167 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9168 [crc]: https://github.com/rust-lang/cargo/pull/1568
9169 [pie]: https://github.com/rust-lang/rust/pull/24953
9170 [abs]: https://github.com/rust-lang/rust/pull/25441
9171 [c]: https://github.com/rust-lang/rust/pull/25496
9172 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9173 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9174 [inc]: https://github.com/rust-lang/rust/pull/25522
9175 [bh]: https://github.com/rust-lang/rust/pull/25856
9176 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9177 [ll]: https://github.com/rust-lang/rust/pull/26022
9178 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9179 [drop]: https://github.com/rust-lang/rust/pull/24935
9181 Version 1.0.0 (2015-05-15)
9182 ========================
9184 * ~1500 changes, numerous bugfixes
9189 * The vast majority of the standard library is now `#[stable]`. It is
9190 no longer possible to use unstable features with a stable build of
9192 * Many popular crates on [crates.io] now work on the stable release
9194 * Arithmetic on basic integer types now [checks for overflow in debug
9200 * Several [restrictions have been added to trait coherence][coh] in
9201 order to make it easier for upstream authors to change traits
9202 without breaking downstream code.
9203 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9204 improve error messages and macro behavior. For example, `0b1234` is
9205 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9206 * Trait bounds [are always invariant][inv], eliminating the need for
9207 the `PhantomFn` and `MarkerTrait` lang items, which have been
9209 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9210 "foo" as bar` syntax has been replaced with `extern crate foo as
9211 bar`, and Cargo now automatically translates "-" in *package* names
9212 to underscore for the crate name.
9213 * [Lifetime shadowing is an error][lt].
9214 * [`Send` no longer implies `'static`][send-rfc].
9215 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9216 `MyType::default()`.
9217 * Primitive types [now have inherent methods][prim-inherent],
9218 obviating the need for extension traits like `SliceExt`.
9219 * Methods with `Self: Sized` in their `where` clause are [considered
9220 object-safe][self-sized], allowing many extension traits like
9221 `IteratorExt` to be merged into the traits they extended.
9222 * You can now [refer to associated types][assoc-where] whose
9223 corresponding trait bounds appear only in a `where` clause.
9224 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9225 like `Send` and `Sync` are now library-defined.
9226 * A [Reflect trait][reflect] was introduced, which means that
9227 downcasting via the `Any` trait is effectively limited to concrete
9228 types. This helps retain the potentially-important "parametricity"
9229 property: generic code cannot behave differently for different type
9230 arguments except in minor ways.
9231 * The `unsafe_destructor` feature is now deprecated in favor of the
9232 [new `dropck`][dropck]. This change is a major reduction in unsafe
9238 * The `thread_local` module [has been renamed to `std::thread`][th].
9239 * The methods of `IteratorExt` [have been moved to the `Iterator`
9241 * Several traits that implement Rust's conventions for type
9242 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9243 [centralized in the `std::convert` module][con].
9244 * The `FromError` trait [was removed in favor of `From`][fe].
9245 * The basic sleep function [has moved to
9246 `std::thread::sleep_ms`][slp].
9247 * The `splitn` function now takes an `n` parameter that represents the
9248 number of items yielded by the returned iterator [instead of the
9249 number of 'splits'][spl].
9250 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9251 * [Derived implementations of `PartialOrd` now order enums according
9252 to their explicitly-assigned discriminants][po].
9253 * [Methods for searching strings are generic over `Pattern`s][pat],
9254 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9256 * [In method resolution, object methods are resolved before inherent
9258 * [`String::from_str` has been deprecated in favor of the `From` impl,
9259 `String::from`][sf].
9260 * [`io::Error` implements `Sync`][ios].
9261 * [The `words` method on `&str` has been replaced with
9262 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9264 * The new path and IO modules are complete and `#[stable]`. This
9265 was the major library focus for this cycle.
9266 * The path API was [revised][path-normalize] to normalize `.`,
9267 adjusting the tradeoffs in favor of the most common usage.
9268 * A large number of remaining APIs in `std` were also stabilized
9269 during this cycle; about 75% of the non-deprecated API surface
9271 * The new [string pattern API][string-pattern] landed, which makes
9272 the string slice API much more internally consistent and flexible.
9273 * A new set of [generic conversion traits][conversion] replaced
9274 many existing ad hoc traits.
9275 * Generic numeric traits were [completely removed][num-traits]. This
9276 was made possible thanks to inherent methods for primitive types,
9277 and the removal gives maximal flexibility for designing a numeric
9278 hierarchy in the future.
9279 * The `Fn` traits are now related via [inheritance][fn-inherit]
9280 and provide ergonomic [blanket implementations][fn-blanket].
9281 * The `Index` and `IndexMut` traits were changed to
9282 [take the index by value][index-value], enabling code like
9283 `hash_map["string"]` to work.
9284 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9285 `Copy` data is known to be `Clone` as well.
9290 * Many errors now have extended explanations that can be accessed with
9291 the `--explain` flag to `rustc`.
9292 * Many new examples have been added to the standard library
9294 * rustdoc has received a number of improvements focused on completion
9296 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9297 * Much headway was made on ecosystem-wide CI, making it possible
9298 to [compare builds for breakage][ci-compare].
9301 [crates.io]: http://crates.io
9302 [clo]: https://github.com/rust-lang/rust/pull/24034
9303 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9304 [con]: https://github.com/rust-lang/rust/pull/23875
9305 [cr]: https://github.com/rust-lang/rust/pull/23419
9306 [fe]: https://github.com/rust-lang/rust/pull/23879
9307 [ie]: https://github.com/rust-lang/rust/pull/23300
9308 [inv]: https://github.com/rust-lang/rust/pull/23938
9309 [ios]: https://github.com/rust-lang/rust/pull/24133
9310 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9311 [lt]: https://github.com/rust-lang/rust/pull/24057
9312 [meth]: https://github.com/rust-lang/rust/pull/24056
9313 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9314 [po]: https://github.com/rust-lang/rust/pull/24270
9315 [sf]: https://github.com/rust-lang/rust/pull/24517
9316 [slp]: https://github.com/rust-lang/rust/pull/23949
9317 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9318 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9319 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9320 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9321 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9322 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9323 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9324 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9325 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9326 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9327 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9328 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9329 [reflect]: https://github.com/rust-lang/rust/pull/23712
9330 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9331 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9332 [index-value]: https://github.com/rust-lang/rust/pull/23601
9333 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9334 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9335 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9336 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9337 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9338 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9341 Version 1.0.0-alpha.2 (2015-02-20)
9342 =====================================
9344 * ~1300 changes, numerous bugfixes
9348 * The various I/O modules were [overhauled][io-rfc] to reduce
9349 unnecessary abstractions and provide better interoperation with
9350 the underlying platform. The old `io` module remains temporarily
9352 * The standard library now [participates in feature gating][feat],
9353 so use of unstable libraries now requires a `#![feature(...)]`
9354 attribute. The impact of this change is [described on the
9355 forum][feat-forum]. [RFC][feat-rfc].
9359 * `for` loops [now operate on the `IntoIterator` trait][into],
9360 which eliminates the need to call `.iter()`, etc. to iterate
9361 over collections. There are some new subtleties to remember
9362 though regarding what sort of iterators various types yield, in
9363 particular that `for foo in bar { }` yields values from a move
9364 iterator, destroying the original collection. [RFC][into-rfc].
9365 * Objects now have [default lifetime bounds][obj], so you don't
9366 have to write `Box<Trait+'static>` when you don't care about
9367 storing references. [RFC][obj-rfc].
9368 * In types that implement `Drop`, [lifetimes must outlive the
9369 value][drop]. This will soon make it possible to safely
9370 implement `Drop` for types where `#[unsafe_destructor]` is now
9371 required. Read the [gorgeous RFC][drop-rfc] for details.
9372 * The fully qualified <T as Trait>::X syntax lets you set the Self
9373 type for a trait method or associated type. [RFC][ufcs-rfc].
9374 * References to types that implement `Deref<U>` now [automatically
9375 coerce to references][deref] to the dereferenced type `U`,
9376 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9377 should eliminate many unsightly uses of `&*`, as when converting
9378 from references to vectors into references to
9379 slices. [RFC][deref-rfc].
9380 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9381 `|:|`) is obsolete and closure kind is inferred from context.
9382 * [`Self` is a keyword][Self].
9386 * The `Show` and `String` formatting traits [have been
9387 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9388 their related purposes. Automatically getting a string
9389 conversion to use with `format!("{:?}", something_to_debug)` is
9390 now written `#[derive(Debug)]`.
9391 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9392 OsStr}`, provide strings in platform-specific encodings for easier
9393 interop with system APIs. [RFC][osstr-rfc].
9394 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9395 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9396 creating raw pointers.
9400 * Certain long error messages of the form 'expected foo found bar'
9401 are now [split neatly across multiple
9402 lines][multiline]. Examples in the PR.
9403 * On Unix Rust can be [uninstalled][un] by running
9404 `/usr/local/lib/rustlib/uninstall.sh`.
9405 * The `#[rustc_on_unimplemented]` attribute, requiring the
9406 'on_unimplemented' feature, lets rustc [display custom error
9407 messages when a trait is expected to be implemented for a type
9412 * Rust is tested against a [LALR grammar][lalr], which parses
9413 almost all the Rust files that rustc does.
9415 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9416 [close]: https://github.com/rust-lang/rust/pull/21843
9417 [deref]: https://github.com/rust-lang/rust/pull/21351
9418 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9419 [drop]: https://github.com/rust-lang/rust/pull/21972
9420 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9421 [feat]: https://github.com/rust-lang/rust/pull/21248
9422 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9423 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9424 [fmt]: https://github.com/rust-lang/rust/pull/21457
9425 [into]: https://github.com/rust-lang/rust/pull/20790
9426 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9427 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9428 [lalr]: https://github.com/rust-lang/rust/pull/21452
9429 [multiline]: https://github.com/rust-lang/rust/pull/19870
9430 [obj]: https://github.com/rust-lang/rust/pull/22230
9431 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9432 [onun]: https://github.com/rust-lang/rust/pull/20889
9433 [osstr]: https://github.com/rust-lang/rust/pull/21488
9434 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9435 [Self]: https://github.com/rust-lang/rust/pull/22158
9436 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9437 [un]: https://github.com/rust-lang/rust/pull/22256
9440 Version 1.0.0-alpha (2015-01-09)
9441 ==================================
9443 * ~2400 changes, numerous bugfixes
9447 * The language itself is considered feature complete for 1.0,
9448 though there will be many usability improvements and bugfixes
9449 before the final release.
9450 * Nearly 50% of the public API surface of the standard library has
9451 been declared 'stable'. Those interfaces are unlikely to change
9453 * The long-running debate over integer types has been
9454 [settled][ints]: Rust will ship with types named `isize` and
9455 `usize`, rather than `int` and `uint`, for pointer-sized
9456 integers. Guidelines will be rolled out during the alpha cycle.
9457 * Most crates that are not `std` have been moved out of the Rust
9458 distribution into the Cargo ecosystem so they can evolve
9459 separately and don't need to be stabilized as quickly, including
9460 'time', 'getopts', 'num', 'regex', and 'term'.
9461 * Documentation continues to be expanded with more API coverage, more
9462 examples, and more in-depth explanations. The guides have been
9463 consolidated into [The Rust Programming Language][trpl].
9464 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9465 * All official Rust binary installers now come with [Cargo], the
9466 Rust package manager.
9470 * Closures have been [completely redesigned][unboxed] to be
9471 implemented in terms of traits, can now be used as generic type
9472 bounds and thus monomorphized and inlined, or via an opaque
9473 pointer (boxed) as in the old system. The new system is often
9474 referred to as 'unboxed' closures.
9475 * Traits now support [associated types][assoc], allowing families
9476 of related types to be defined together and used generically in
9478 * Enum variants are [namespaced by their type names][enum].
9479 * [`where` clauses][where] provide a more versatile and attractive
9480 syntax for specifying generic bounds, though the previous syntax
9482 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9484 * Rust [no longer has a runtime][rt] of any description, and only
9485 supports OS threads, not green threads.
9486 * At long last, Rust has been overhauled for 'dynamically-sized
9487 types' ([DST]), which integrates 'fat pointers' (object types,
9488 arrays, and `str`) more deeply into the type system, making it
9490 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9491 `..j` that produce range types and which, when combined with the
9492 `Index` operator and multidispatch, leads to a convenient slice
9494 * The new range syntax revealed an ambiguity in the fixed-length
9495 array syntax, so now fixed length arrays [are written `[T;
9497 * The `Copy` trait is no longer implemented automatically. Unsafe
9498 pointers no longer implement `Sync` and `Send` so types
9499 containing them don't automatically either. `Sync` and `Send`
9500 are now 'unsafe traits' so one can "forcibly" implement them via
9501 `unsafe impl` if a type confirms to the requirements for them
9502 even though the internals do not (e.g. structs containing unsafe
9503 pointers like `Arc`). These changes are intended to prevent some
9504 footguns and are collectively known as [opt-in built-in
9505 traits][oibit] (though `Sync` and `Send` will soon become pure
9506 library types unknown to the compiler).
9507 * Operator traits now take their operands [by value][ops], and
9508 comparison traits can use multidispatch to compare one type
9509 against multiple other types, allowing e.g. `String` to be
9510 compared with `&str`.
9511 * `if let` and `while let` are no longer feature-gated.
9512 * Rust has adopted a more [uniform syntax for escaping unicode
9513 characters][unicode].
9514 * `macro_rules!` [has been declared stable][mac]. Though it is a
9515 flawed system it is sufficiently popular that it must be usable
9516 for 1.0. Effort has gone into [future-proofing][mac-future] it
9517 in ways that will allow other macro systems to be developed in
9518 parallel, and won't otherwise impact the evolution of the
9520 * The prelude has been [pared back significantly][prelude] such
9521 that it is the minimum necessary to support the most pervasive
9522 code patterns, and through [generalized where clauses][where]
9523 many of the prelude extension traits have been consolidated.
9524 * Rust's rudimentary reflection [has been removed][refl], as it
9525 incurred too much code generation for little benefit.
9526 * [Struct variants][structvars] are no longer feature-gated.
9527 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9528 known as 'higher-ranked trait bounds', this crucially allows
9529 unboxed closures to work.
9530 * Macros invocations surrounded by parens or square brackets and
9531 not terminated by a semicolon are [parsed as
9532 expressions][macros], which makes expressions like `vec![1i32,
9533 2, 3].len()` work as expected.
9534 * Trait objects now implement their traits automatically, and
9535 traits that can be coerced to objects now must be [object
9537 * Automatically deriving traits is now done with `#[derive(...)]`
9538 not `#[deriving(...)]` for [consistency with other naming
9539 conventions][derive].
9540 * Importing the containing module or enum at the same time as
9541 items or variants they contain is [now done with `self` instead
9542 of `mod`][self], as in use `foo::{self, bar}`
9543 * Glob imports are no longer feature-gated.
9544 * The `box` operator and `box` patterns have been feature-gated
9545 pending a redesign. For now unique boxes should be allocated
9546 like other containers, with `Box::new`.
9550 * A [series][coll1] of [efforts][coll2] to establish
9551 [conventions][coll3] for collections types has resulted in API
9552 improvements throughout the standard library.
9553 * New [APIs for error handling][err] provide ergonomic interop
9554 between error types, and [new conventions][err-conv] describe
9555 more clearly the recommended error handling strategies in Rust.
9556 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9557 it is easier to discuss failure in the context of error handling
9558 without making clarifications as to whether you are referring to
9559 the 'fail' macro or failure more generally.
9560 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9561 syscall when available.
9562 * The 'serialize' crate has been renamed 'rustc-serialize' and
9563 moved out of the distribution to Cargo. Although it is widely
9564 used now, it is expected to be superseded in the near future.
9565 * The `Show` formatter, typically implemented with
9566 `#[derive(Show)]` is [now requested with the `{:?}`
9567 specifier][show] and is intended for use by all types, for uses
9568 such as `println!` debugging. The new `String` formatter must be
9569 implemented by hand, uses the `{}` specifier, and is intended
9570 for full-fidelity conversions of things that can logically be
9571 represented as strings.
9575 * [Flexible target specification][flex] allows rustc's code
9576 generation to be configured to support otherwise-unsupported
9578 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9579 respective debuggers with Rust-appropriate pretty-printing.
9580 * The Windows installation of Rust is distributed with the
9581 MinGW components currently required to link binaries on that
9586 * Nullable enum optimizations have been extended to more types so
9587 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9588 space than the inner types themselves.
9589 * Work has begun on supporting AArch64.
9591 [Cargo]: https://crates.io
9592 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9593 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9594 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9595 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9596 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9597 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9598 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9599 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9600 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9601 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9602 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9603 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9604 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9605 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9606 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9607 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9608 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9609 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9610 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9611 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9612 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9613 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9614 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9615 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9616 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9617 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9618 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9619 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9620 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9621 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9622 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9623 [trpl]: https://doc.rust-lang.org/book/index.html
9624 [rbe]: http://rustbyexample.com/
9627 Version 0.12.0 (2014-10-09)
9628 =============================
9630 * ~1900 changes, numerous bugfixes
9634 * The introductory documentation (now called The Rust Guide) has
9635 been completely rewritten, as have a number of supplementary
9637 * Rust's package manager, Cargo, continues to improve and is
9638 sometimes considered to be quite awesome.
9639 * Many API's in `std` have been reviewed and updated for
9640 consistency with the in-development Rust coding
9641 guidelines. The standard library documentation tracks
9642 stabilization progress.
9643 * Minor libraries have been moved out-of-tree to the rust-lang org
9644 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9645 be installed with Cargo.
9646 * Lifetime elision allows lifetime annotations to be left off of
9647 function declarations in many common scenarios.
9648 * Rust now works on 64-bit Windows.
9651 * Indexing can be overloaded with the `Index` and `IndexMut`
9653 * The `if let` construct takes a branch only if the `let` pattern
9654 matches, currently behind the 'if_let' feature gate.
9655 * 'where clauses', a more flexible syntax for specifying trait
9656 bounds that is more aesthetic, have been added for traits and
9657 free functions. Where clauses will in the future make it
9658 possible to constrain associated types, which would be
9659 impossible with the existing syntax.
9660 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9661 the 'slicing_syntax' feature gate, and can be overloaded with
9662 the `Slice` or `SliceMut` traits.
9663 * The syntax for matching of sub-slices has been changed to use a
9664 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9665 consistency with other uses of `..` and to future-proof
9666 potential additional uses of the syntax.
9667 * The syntax for matching inclusive ranges in patterns has changed
9668 from `0..3` to `0...4` to be consistent with the exclusive range
9670 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9671 c]`) has been put behind the 'advanced_slice_patterns' feature
9672 gate and may be removed in the future.
9673 * Components of tuples and tuple structs can be extracted using
9674 the `value.0` syntax, currently behind the `tuple_indexing`
9676 * The `#[crate_id]` attribute is no longer supported; versioning
9677 is handled by the package manager.
9678 * Renaming crate imports are now written `extern crate foo as bar`
9679 instead of `extern crate bar = foo`.
9680 * Renaming use statements are now written `use foo as bar` instead
9682 * `let` and `match` bindings and argument names in macros are now
9684 * The new, more efficient, closure types ('unboxed closures') have
9685 been added under a feature gate, 'unboxed_closures'. These will
9686 soon replace the existing closure types, once higher-ranked
9687 trait lifetimes are added to the language.
9688 * `move` has been added as a keyword, for indicating closures
9689 that capture by value.
9690 * Mutation and assignment is no longer allowed in pattern guards.
9691 * Generic structs and enums can now have trait bounds.
9692 * The `Share` trait is now called `Sync` to free up the term
9693 'shared' to refer to 'shared reference' (the default reference
9695 * Dynamically-sized types have been mostly implemented,
9696 unifying the behavior of fat-pointer types with the rest of the
9698 * As part of dynamically-sized types, the `Sized` trait has been
9699 introduced, which qualifying types implement by default, and
9700 which type parameters expect by default. To specify that a type
9701 parameter does not need to be sized, write `<Sized? T>`. Most
9702 types are `Sized`, notable exceptions being unsized arrays
9703 (`[T]`) and trait types.
9704 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9705 * Lifetime bounds can now be applied to type parameters and object
9707 * The old, reference counted GC type, `Gc<T>` which was once
9708 denoted by the `@` sigil, has finally been removed. GC will be
9709 revisited in the future.
9712 * Library documentation has been improved for a number of modules.
9713 * Bit-vectors, collections::bitv has been modernized.
9714 * The url crate is deprecated in favor of
9715 http://github.com/servo/rust-url, which can be installed with
9717 * Most I/O stream types can be cloned and subsequently closed from
9719 * A `std::time::Duration` type has been added for use in I/O
9720 methods that rely on timers, as well as in the 'time' crate's
9721 `Timespec` arithmetic.
9722 * The runtime I/O abstraction layer that enabled the green thread
9723 scheduler to do non-thread-blocking I/O has been removed, along
9724 with the libuv-based implementation employed by the green thread
9725 scheduler. This will greatly simplify the future I/O work.
9726 * `collections::btree` has been rewritten to have a more
9727 idiomatic and efficient design.
9730 * rustdoc output now indicates the stability levels of API's.
9731 * The `--crate-name` flag can specify the name of the crate
9732 being compiled, like `#[crate_name]`.
9733 * The `-C metadata` specifies additional metadata to hash into
9734 symbol names, and `-C extra-filename` specifies additional
9735 information to put into the output filename, for use by the
9736 package manager for versioning.
9737 * debug info generation has continued to improve and should be
9738 more reliable under both gdb and lldb.
9739 * rustc has experimental support for compiling in parallel
9740 using the `-C codegen-units` flag.
9741 * rustc no longer encodes rpath information into binaries by
9745 * Stack usage has been optimized with LLVM lifetime annotations.
9746 * Official Rust binaries on Linux are more compatible with older
9747 kernels and distributions, built on CentOS 5.10.
9750 Version 0.11.0 (2014-07-02)
9751 ==========================
9753 * ~1700 changes, numerous bugfixes
9756 * ~[T] has been removed from the language. This type is superseded by
9758 * ~str has been removed from the language. This type is superseded by
9760 * ~T has been removed from the language. This type is superseded by the
9762 * @T has been removed from the language. This type is superseded by the
9763 standard library's std::gc::Gc<T> type.
9764 * Struct fields are now all private by default.
9765 * Vector indices and shift amounts are both required to be a `uint`
9766 instead of any integral type.
9767 * Byte character, byte string, and raw byte string literals are now all
9768 supported by prefixing the normal literal with a `b`.
9769 * Multiple ABIs are no longer allowed in an ABI string
9770 * The syntax for lifetimes on closures/procedures has been tweaked
9771 slightly: `<'a>|A, B|: 'b + K -> T`
9772 * Floating point modulus has been removed from the language; however it
9773 is still provided by a library implementation.
9774 * Private enum variants are now disallowed.
9775 * The `priv` keyword has been removed from the language.
9776 * A closure can no longer be invoked through a &-pointer.
9777 * The `use foo, bar, baz;` syntax has been removed from the language.
9778 * The transmute intrinsic no longer works on type parameters.
9779 * Statics now allow blocks/items in their definition.
9780 * Trait bounds are separated from objects with + instead of : now.
9781 * Objects can no longer be read while they are mutably borrowed.
9782 * The address of a static is now marked as insignificant unless the
9783 #[inline(never)] attribute is placed it.
9784 * The #[unsafe_destructor] attribute is now behind a feature gate.
9785 * Struct literals are no longer allowed in ambiguous positions such as
9786 if, while, match, and for..in.
9787 * Declaration of lang items and intrinsics are now feature-gated by
9789 * Integral literals no longer default to `int`, and floating point
9790 literals no longer default to `f64`. Literals must be suffixed with an
9791 appropriate type if inference cannot determine the type of the
9793 * The Box<T> type is no longer implicitly borrowed to &mut T.
9794 * Procedures are now required to not capture borrowed references.
9797 * The standard library is now a "facade" over a number of underlying
9798 libraries. This means that development on the standard library should
9799 be speedier due to smaller crates, as well as a clearer line between
9801 * A new library, libcore, lives under the standard library's facade
9802 which is Rust's "0-assumption" library, suitable for embedded and
9803 kernel development for example.
9804 * A regex crate has been added to the standard distribution. This crate
9805 includes statically compiled regular expressions.
9806 * The unwrap/unwrap_err methods on Result require a Show bound for
9807 better error messages.
9808 * The return types of the std::comm primitives have been centralized
9809 around the Result type.
9810 * A number of I/O primitives have gained the ability to time out their
9812 * A number of I/O primitives have gained the ability to close their
9813 reading/writing halves to cancel pending operations.
9814 * Reverse iterator methods have been removed in favor of `rev()` on
9815 their forward-iteration counterparts.
9816 * A bitflags! macro has been added to enable easy interop with C and
9817 management of bit flags.
9818 * A debug_assert! macro is now provided which is disabled when
9819 `--cfg ndebug` is passed to the compiler.
9820 * A graphviz crate has been added for creating .dot files.
9821 * The std::cast module has been migrated into std::mem.
9822 * The std::local_data api has been migrated from freestanding functions
9823 to being based on methods.
9824 * The Pod trait has been renamed to Copy.
9825 * jemalloc has been added as the default allocator for types.
9826 * The API for allocating memory has been changed to use proper alignment
9827 and sized deallocation
9828 * Connecting a TcpStream or binding a TcpListener is now based on a
9829 string address and a u16 port. This allows connecting to a hostname as
9831 * The Reader trait now contains a core method, read_at_least(), which
9832 correctly handles many repeated 0-length reads.
9833 * The process-spawning API is now centered around a builder-style
9835 * The :? printing qualifier has been moved from the standard library to
9836 an external libdebug crate.
9837 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9838 have been renamed to Eq/Ord.
9839 * The select/plural methods have been removed from format!. The escapes
9840 for { and } have also changed from \{ and \} to {{ and }},
9842 * The TaskBuilder API has been re-worked to be a true builder, and
9843 extension traits for spawning native/green tasks have been added.
9846 * All breaking changes to the language or libraries now have their
9847 commit message annotated with `[breaking-change]` to allow for easy
9848 discovery of breaking changes.
9849 * The compiler will now try to suggest how to annotate lifetimes if a
9850 lifetime-related error occurs.
9851 * Debug info continues to be improved greatly with general bug fixes and
9852 better support for situations like link time optimization (LTO).
9853 * Usage of syntax extensions when cross-compiling has been fixed.
9854 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9855 -fdata-sections and --gc-sections has been enabled by default
9856 * The compiler is now stricter about where it will load module files
9857 from when a module is declared via `mod foo;`.
9858 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9859 Syntax extensions are now discovered via a "plugin registrar" type
9860 which will be extended in the future to other various plugins.
9861 * Lints have been restructured to allow for dynamically loadable lints.
9862 * A number of rustdoc improvements:
9863 * The HTML output has been visually redesigned.
9864 * Markdown is now powered by hoedown instead of sundown.
9865 * Searching heuristics have been greatly improved.
9866 * The search index has been reduced in size by a great amount.
9867 * Cross-crate documentation via `pub use` has been greatly improved.
9868 * Primitive types are now hyperlinked and documented.
9869 * Documentation has been moved from static.rust-lang.org/doc to
9871 * A new sandbox, play.rust-lang.org, is available for running and
9872 sharing rust code examples on-line.
9873 * Unused attributes are now more robustly warned about.
9874 * The dead_code lint now warns about unused struct fields.
9875 * Cross-compiling to iOS is now supported.
9876 * Cross-compiling to mipsel is now supported.
9877 * Stability attributes are now inherited by default and no longer apply
9878 to intra-crate usage, only inter-crate usage.
9879 * Error message related to non-exhaustive match expressions have been
9883 Version 0.10 (2014-04-03)
9884 =========================
9886 * ~1500 changes, numerous bugfixes
9889 * A new RFC process is now in place for modifying the language.
9890 * Patterns with `@`-pointers have been removed from the language.
9891 * Patterns with unique vectors (`~[T]`) have been removed from the
9893 * Patterns with unique strings (`~str`) have been removed from the
9895 * `@str` has been removed from the language.
9896 * `@[T]` has been removed from the language.
9897 * `@self` has been removed from the language.
9898 * `@Trait` has been removed from the language.
9899 * Headers on `~` allocations which contain `@` boxes inside the type for
9900 reference counting have been removed.
9901 * The semantics around the lifetimes of temporary expressions have changed,
9902 see #3511 and #11585 for more information.
9903 * Cross-crate syntax extensions are now possible, but feature gated. See
9904 #11151 for more information. This includes both `macro_rules!` macros as
9905 well as syntax extensions such as `format!`.
9906 * New lint modes have been added, and older ones have been turned on to be
9908 * Unnecessary parentheses
9911 * Uppercase variables
9912 * Publicly visible private types
9913 * `#[deriving]` with raw pointers
9914 * Unsafe functions can no longer be coerced to closures.
9915 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9916 * The `#[simd]` attribute is now behind a feature gate.
9917 * Visibility is no longer allowed on `extern crate` statements, and
9918 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9919 * Trailing commas are now allowed in argument lists and tuple patterns.
9920 * The `do` keyword has been removed, it is now a reserved keyword.
9921 * Default type parameters have been implemented, but are feature gated.
9922 * Borrowed variables through captures in closures are now considered soundly.
9923 * `extern mod` is now `extern crate`
9924 * The `Freeze` trait has been removed.
9925 * The `Share` trait has been added for types that can be shared among
9927 * Labels in macros are now hygienic.
9928 * Expression/statement macro invocations can be delimited with `{}` now.
9929 * Treatment of types allowed in `static mut` locations has been tweaked.
9930 * The `*` and `.` operators are now overloadable through the `Deref` and
9932 * `~Trait` and `proc` no longer have `Send` bounds by default.
9933 * Partial type hints are now supported with the `_` type marker.
9934 * An `Unsafe` type was introduced for interior mutability. It is now
9935 considered undefined to transmute from `&T` to `&mut T` without using the
9937 * The #[linkage] attribute was implemented for extern statics/functions.
9938 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9939 * `Pod` was renamed to `Copy`.
9942 * The `libextra` library has been removed. It has now been decomposed into
9943 component libraries with smaller and more focused nuggets of
9944 functionality. The full list of libraries can be found on the
9945 documentation index page.
9946 * std: `std::condition` has been removed. All I/O errors are now propagated
9947 through the `Result` type. In order to assist with error handling, a
9948 `try!` macro for unwrapping errors with an early return and a lint for
9949 unused results has been added. See #12039 for more information.
9950 * std: The `vec` module has been renamed to `slice`.
9951 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9952 This will become the only growable vector in the future.
9953 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9954 are now found at `std::io::BufferedReader` instead of
9955 `std::io::buffered::BufferedReader`.
9956 * std: `print` and `println` are no longer in the prelude, the `print!` and
9957 `println!` macros are intended to be used instead.
9958 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9959 attempts to statically prevent cycles.
9960 * std: The standard distribution is adopting the policy of pushing failure
9961 to the user rather than failing in libraries. Many functions (such as
9962 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9963 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9964 deriving mode: `#[deriving(Show)]`.
9965 * std: `ToStr` is now implemented for all types implementing `Show`.
9966 * std: The formatting trait methods now take `&self` instead of `&T`
9967 * std: The `invert()` method on iterators has been renamed to `rev()`
9968 * std: `std::num` has seen a reduction in the genericity of its traits,
9969 consolidating functionality into a few core traits.
9970 * std: Backtraces are now printed on task failure if the environment
9971 variable `RUST_BACKTRACE` is present.
9972 * std: Naming conventions for iterators have been standardized. More details
9973 can be found on the wiki's style guide.
9974 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9975 still implement the function.
9976 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9977 * std: `assert_approx_eq!` has been removed
9978 * std: The `e` and `E` formatting specifiers for floats have been added to
9979 print them in exponential notation.
9980 * std: The `Times` trait has been removed
9981 * std: Indications of variance and opting out of builtin bounds is done
9982 through marker types in `std::kinds::marker` now
9983 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9984 `#[deriving(Hash)]` is now possible.
9985 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9986 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9987 * std: `Chan::new` is now `channel()`.
9988 * std: A new synchronous channel type has been implemented.
9989 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9990 * std: `hashmap` and `trie` have been moved to `libcollections`
9991 * std: `run` has been rolled into `io::process`
9992 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9993 * std: The equality and comparison traits have seen some reorganization.
9994 * std: `rand` has moved to `librand`.
9995 * std: `to_{lower,upper}case` has been implemented for `char`.
9996 * std: Logging has been moved to `liblog`.
9997 * collections: `HashMap` has been rewritten for higher performance and less
9999 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10000 it can be booted manually. The runtime guide has more information and
10002 * native: All I/O functionality except signals has been implemented.
10003 * green: Task spawning with `libgreen` has been optimized with stack caching
10004 and various trimming of code.
10005 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10006 * sync: The `extra::sync` module has been updated to modern rust (and moved
10007 to the `sync` library), tweaking and improving various interfaces while
10008 dropping redundant functionality.
10009 * sync: A new `Barrier` type has been added to the `sync` library.
10010 * sync: An efficient mutex for native and green tasks has been implemented.
10011 * serialize: The `base64` module has seen some improvement. It treats
10012 newlines better, has non-string error values, and has seen general
10014 * fourcc: A `fourcc!` macro was introduced
10015 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10016 hexadecimal literal.
10019 * `rustpkg` has been deprecated and removed from the main repository. Its
10020 replacement, `cargo`, is under development.
10021 * Nightly builds of rust are now available
10022 * The memory usage of rustc has been improved many times throughout this
10024 * The build process supports disabling rpath support for the rustc binary
10026 * Code generation has improved in some cases, giving more information to the
10027 LLVM optimization passes to enable more extensive optimizations.
10028 * Debuginfo compatibility with lldb on OSX has been restored.
10029 * The master branch is now gated on an android bot, making building for
10030 android much more reliable.
10031 * Output flags have been centralized into one `--emit` flag.
10032 * Crate type flags have been centralized into one `--crate-type` flag.
10033 * Codegen flags have been consolidated behind a `-C` flag.
10034 * Linking against outdated crates now has improved error messages.
10035 * Error messages with lifetimes will often suggest how to annotate the
10036 function to fix the error.
10037 * Many more types are documented in the standard library, and new guides
10039 * Many `rustdoc` improvements:
10040 * code blocks are syntax highlighted.
10041 * render standalone markdown files.
10042 * the --test flag tests all code blocks by default.
10043 * exported macros are displayed.
10044 * re-exported types have their documentation inlined at the location of the
10046 * search works across crates that have been rendered to the same output
10050 Version 0.9 (2014-01-09)
10051 ==========================
10053 * ~1800 changes, numerous bugfixes
10056 * The `float` type has been removed. Use `f32` or `f64` instead.
10057 * A new facility for enabling experimental features (feature gating) has
10058 been added, using the crate-level `#[feature(foo)]` attribute.
10059 * Managed boxes (@) are now behind a feature gate
10060 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10061 standard library's `Gc` or `Rc` types instead.
10062 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10063 * Jumping back to the top of a loop is now done with `continue` instead of
10065 * Strings can no longer be mutated through index assignment.
10066 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10067 hash delimiters, as in `r###"foo"###`.
10068 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10070 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10071 * `@fn`s have been removed.
10072 * `do` only works with procs in order to make it obvious what the cost
10074 * Single-element tuple-like structs can no longer be dereferenced to
10075 obtain the inner value. A more comprehensive solution for overloading
10076 the dereference operator will be provided in the future.
10077 * The `#[link(...)]` attribute has been replaced with
10078 `#[crate_id = "name#vers"]`.
10079 * Empty `impl`s must be terminated with empty braces and may not be
10080 terminated with a semicolon.
10081 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10082 no longer has any special meaning.
10083 * The old `fmt!` string formatting macro has been removed.
10084 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10085 `print!` and `println!`.
10086 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10087 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10088 `extern mod foo = "bar"` instead.
10089 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10090 * Macros can have attributes.
10091 * Macros can expand to items with attributes.
10092 * Macros can expand to multiple items.
10093 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10094 * Comments may be nested.
10095 * Values automatically coerce to trait objects they implement, without
10097 * Enum discriminants are no longer an entire word but as small as needed to
10098 contain all the variants. The `repr` attribute can be used to override
10099 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10100 `#[repr(C)]` to match C enums.
10101 * Non-string literals are not allowed in attributes (they never worked).
10102 * The FFI now supports variadic functions.
10103 * Octal numeric literals, as in `0o7777`.
10104 * The `concat!` syntax extension performs compile-time string concatenation.
10105 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10106 removed as Rust no longer uses segmented stacks.
10107 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10108 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10109 not `*`; ignoring remaining fields of a struct is also done with `..`,
10110 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10111 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10112 * `rustc` supports the "system" calling convention, which defaults to the
10113 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10115 * The `type_overflow` lint (default: warn) checks literals for overflow.
10116 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10117 * The `attribute_usage` lint (default: warn) warns about unknown
10119 * The `unknown_features` lint (default: warn) warns about unknown
10121 * The `dead_code` lint (default: warn) checks for dead code.
10122 * Rust libraries can be linked statically to one another
10123 * `#[link_args]` is behind the `link_args` feature gate.
10124 * Native libraries are now linked with `#[link(name = "foo")]`
10125 * Native libraries can be statically linked to a rust crate
10126 (`#[link(name = "foo", kind = "static")]`).
10127 * Native OS X frameworks are now officially supported
10128 (`#[link(name = "foo", kind = "framework")]`).
10129 * The `#[thread_local]` attribute creates thread-local (not task-local)
10130 variables. Currently behind the `thread_local` feature gate.
10131 * The `return` keyword may be used in closures.
10132 * Types that can be copied via a memcpy implement the `Pod` kind.
10133 * The `cfg` attribute can now be used on struct fields and enum variants.
10136 * std: The `option` and `result` API's have been overhauled to make them
10137 simpler, more consistent, and more composable.
10138 * std: The entire `std::io` module has been replaced with one that is
10139 more comprehensive and that properly interfaces with the underlying
10140 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10142 * std: `io::util` contains a number of useful implementations of
10143 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10144 `ZeroReader`, `TeeReader`.
10145 * std: The reference counted pointer type `extra::rc` moved into std.
10146 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10147 just a wrapper around it).
10148 * std: The `Either` type has been removed.
10149 * std: `fmt::Default` can be implemented for any type to provide default
10150 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10151 * std: The `rand` API continues to be tweaked.
10152 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10153 on failure in gdb, is now named `rust_fail`.
10154 * std: The `each_key` and `each_value` methods on `HashMap` have been
10155 replaced by the `keys` and `values` iterators.
10156 * std: Functions dealing with type size and alignment have moved from the
10157 `sys` module to the `mem` module.
10158 * std: The `path` module was written and API changed.
10159 * std: `str::from_utf8` has been changed to cast instead of allocate.
10160 * std: `starts_with` and `ends_with` methods added to vectors via the
10161 `ImmutableEqVector` trait, which is in the prelude.
10162 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10163 if the index is out of bounds.
10164 * std: Task failure no longer propagates between tasks, as the model was
10165 complex, expensive, and incompatible with thread-based tasks.
10166 * std: The `Any` type can be used for dynamic typing.
10167 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10169 * std: Methods that produce iterators generally do not have an `_iter`
10171 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10172 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10173 * std: `util::ignore` renamed to `prelude::drop`.
10174 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10176 * std: `vec::raw` has seen a lot of cleanup and API changes.
10177 * std: The standard library no longer includes any C++ code, and very
10178 minimal C, eliminating the dependency on libstdc++.
10179 * std: Runtime scheduling and I/O functionality has been factored out into
10180 extensible interfaces and is now implemented by two different crates:
10181 libnative, for native threading and I/O; and libgreen, for green threading
10182 and I/O. This paves the way for using the standard library in more limited
10183 embedded environments.
10184 * std: The `comm` module has been rewritten to be much faster, have a
10185 simpler, more consistent API, and to work for both native and green
10187 * std: All libuv dependencies have been moved into the rustuv crate.
10188 * native: New implementations of runtime scheduling on top of OS threads.
10189 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10191 * green: The green thread scheduler and message passing types are almost
10192 entirely lock-free.
10193 * extra: The `flatpipes` module had bitrotted and was removed.
10194 * extra: All crypto functions have been removed and Rust now has a policy of
10195 not reimplementing crypto in the standard library. In the future crypto
10196 will be provided by external crates with bindings to established libraries.
10197 * extra: `c_vec` has been modernized.
10198 * extra: The `sort` module has been removed. Use the `sort` method on
10202 * The `rust` and `rusti` commands have been removed, due to lack of
10204 * `rustdoc` was completely rewritten.
10205 * `rustdoc` can test code examples in documentation.
10206 * `rustpkg` can test packages with the argument, 'test'.
10207 * `rustpkg` supports arbitrary dependencies, including C libraries.
10208 * `rustc`'s support for generating debug info is improved again.
10209 * `rustc` has better error reporting for unbalanced delimiters.
10210 * `rustc`'s JIT support was removed due to bitrot.
10211 * Executables and static libraries can be built with LTO (-Z lto)
10212 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10216 Version 0.8 (2013-09-26)
10217 ============================
10219 * ~2200 changes, numerous bugfixes
10222 * The `for` loop syntax has changed to work with the `Iterator` trait.
10223 * At long last, unwinding works on Windows.
10224 * Default methods are ready for use.
10225 * Many trait inheritance bugs fixed.
10226 * Owned and borrowed trait objects work more reliably.
10227 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10228 * rustc can omit emission of code for the `debug!` macro if it is passed
10230 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10231 for foo.rs, then foo/mod.rs, and will generate an error when both are
10233 * Strings no longer contain trailing nulls. The new `std::c_str` module
10234 provides new mechanisms for converting to C strings.
10235 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10236 * The FFI has been overhauled such that foreign functions are called directly,
10237 instead of through a stack-switching wrapper.
10238 * Calling a foreign function must be done through a Rust function with the
10239 `#[fixed_stack_segment]` attribute.
10240 * The `externfn!` macro can be used to declare both a foreign function and
10241 a `#[fixed_stack_segment]` wrapper at once.
10242 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10243 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10244 * `priv` is disallowed everywhere except for struct fields and enum variants.
10245 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10246 * `ref` bindings in irrefutable patterns work correctly now.
10247 * `char` is now prevented from containing invalid code points.
10248 * Casting to `bool` is no longer allowed.
10249 * `\0` is now accepted as an escape in chars and strings.
10250 * `yield` is a reserved keyword.
10251 * `typeof` is a reserved keyword.
10252 * Crates may be imported by URL with `extern mod foo = "url";`.
10253 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10254 * Static vectors can be initialized with repeating elements,
10255 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10256 * Static structs can be initialized with functional record update,
10257 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10258 * `cfg!` can be used to conditionally execute code based on the crate
10259 configuration, similarly to `#[cfg(...)]`.
10260 * The `unnecessary_qualification` lint detects unneeded module
10261 prefixes (default: allow).
10262 * Arithmetic operations have been implemented on the SIMD types in
10263 `std::unstable::simd`.
10264 * Exchange allocation headers were removed, reducing memory usage.
10265 * `format!` implements a completely new, extensible, and higher-performance
10266 string formatting system. It will replace `fmt!`.
10267 * `print!` and `println!` write formatted strings (using the `format!`
10268 extension) to stdout.
10269 * `write!` and `writeln!` write formatted strings (using the `format!`
10270 extension) to the new Writers in `std::rt::io`.
10271 * The library section in which a function or static is placed may
10272 be specified with `#[link_section = "..."]`.
10273 * The `proto!` syntax extension for defining bounded message protocols
10275 * `macro_rules!` is hygienic for `let` declarations.
10276 * The `#[export_name]` attribute specifies the name of a symbol.
10277 * `unreachable!` can be used to indicate unreachable code, and fails
10281 * std: Transitioned to the new runtime, written in Rust.
10282 * std: Added an experimental I/O library, `rt::io`, based on the new
10284 * std: A new generic `range` function was added to the prelude, replacing
10285 `uint::range` and friends.
10286 * std: `range_rev` no longer exists. Since range is an iterator it can be
10287 reversed with `range(lo, hi).invert()`.
10288 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10289 renamed to `unwrap_or`.
10290 * std: The `iterator` module was renamed to `iter`.
10291 * std: Integral types now support the `checked_add`, `checked_sub`, and
10292 `checked_mul` operations for detecting overflow.
10293 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10295 * std: Methods are standardizing on conventions for casting methods:
10296 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10298 * std: The `CString` type in `c_str` provides new ways to convert to and
10300 * std: `DoubleEndedIterator` can yield elements in two directions.
10301 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10303 * std: `str::from_bytes` renamed to `str::from_utf8`.
10304 * std: `pop_opt` and `shift_opt` methods added to vectors.
10305 * std: The task-local data interface no longer uses @, and keys are
10306 no longer function pointers.
10307 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10308 * std: Added `SharedPort` to `comm`.
10309 * std: `Eq` has a default method for `ne`; only `eq` is required
10310 in implementations.
10311 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10312 is required in implementations.
10313 * std: `is_utf8` performance is improved, impacting many string functions.
10314 * std: `os::MemoryMap` provides cross-platform mmap.
10315 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10316 are not 'in-bounds' are considered undefined.
10317 * std: Many freestanding functions in `vec` removed in favor of methods.
10318 * std: Many freestanding functions on scalar types removed in favor of
10320 * std: Many options to task builders were removed since they don't make
10321 sense in the new scheduler design.
10322 * std: More containers implement `FromIterator` so can be created by the
10324 * std: More complete atomic types in `unstable::atomics`.
10325 * std: `comm::PortSet` removed.
10326 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10327 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10328 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10329 default implementations.
10330 * std: Various `from_str` functions were removed in favor of a generic
10331 `from_str` which is available in the prelude.
10332 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10333 * extra: `dlist`, the doubly-linked list was modernized.
10334 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10335 * extra: Added `glob` module, replacing `std::os::glob`.
10336 * extra: `rope` was removed.
10337 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10338 * extra: `net`, and `timer` were removed. The experimental replacements
10339 are `std::rt::io::net` and `std::rt::io::timer`.
10340 * extra: Iterators implemented for `SmallIntMap`.
10341 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10342 * extra: `SmallIntSet` removed. Use `BitvSet`.
10343 * extra: Performance of JSON parsing greatly improved.
10344 * extra: `semver` updated to SemVer 2.0.0.
10345 * extra: `term` handles more terminals correctly.
10346 * extra: `dbg` module removed.
10347 * extra: `par` module removed.
10348 * extra: `future` was cleaned up, with some method renames.
10349 * extra: Most free functions in `getopts` were converted to methods.
10352 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10353 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10354 similarly to gcc's `--march` flag.
10355 * rustc's performance compiling small crates is much better.
10356 * rustpkg has received many improvements.
10357 * rustpkg supports git tags as package IDs.
10358 * rustpkg builds into target-specific directories so it can be used for
10360 * The number of concurrent test tasks is controlled by the environment
10361 variable RUST_TEST_TASKS.
10362 * The test harness can now report metrics for benchmarks.
10363 * All tools have man pages.
10364 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10365 * The runtime uses jemalloc for allocations.
10366 * Segmented stacks are temporarily disabled as part of the transition to
10367 the new runtime. Stack overflows are possible!
10368 * A new documentation backend, rustdoc_ng, is available for use. It is
10369 still invoked through the normal `rustdoc` command.
10372 Version 0.7 (2013-07-03)
10373 =======================
10375 * ~2000 changes, numerous bugfixes
10378 * `impl`s no longer accept a visibility qualifier. Put them on methods
10380 * The borrow checker has been rewritten with flow-sensitivity, fixing
10381 many bugs and inconveniences.
10382 * The `self` parameter no longer implicitly means `&'self self`,
10383 and can be explicitly marked with a lifetime.
10384 * Overloadable compound operators (`+=`, etc.) have been temporarily
10385 removed due to bugs.
10386 * The `for` loop protocol now requires `for`-iterators to return `bool`
10387 so they compose better.
10388 * The `Durable` trait is replaced with the `'static` bounds.
10389 * Trait default methods work more often.
10390 * Structs with the `#[packed]` attribute have byte alignment and
10391 no padding between fields.
10392 * Type parameters bound by `Copy` must now be copied explicitly with
10393 the `copy` keyword.
10394 * It is now illegal to move out of a dereferenced unsafe pointer.
10395 * `Option<~T>` is now represented as a nullable pointer.
10396 * `@mut` does dynamic borrow checks correctly.
10397 * The `main` function is only detected at the topmost level of the crate.
10398 The `#[main]` attribute is still valid anywhere.
10399 * Struct fields may no longer be mutable. Use inherited mutability.
10400 * The `#[no_send]` attribute makes a type that would otherwise be
10402 * The `#[no_freeze]` attribute makes a type that would otherwise be
10404 * Unbounded recursion will abort the process after reaching the limit
10405 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10406 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10407 are never implicitly copyable.
10408 * `#[static_assert]` makes compile-time assertions about static bools.
10409 * At long last, 'argument modes' no longer exist.
10410 * The rarely used `use mod` statement no longer exists.
10412 * Syntax extensions
10413 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10415 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10416 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10417 `#[deriving(...)]`.
10418 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10419 and unsuffixed integer literals.
10422 * The `core` crate was renamed to `std`.
10423 * The `std` crate was renamed to `extra`.
10424 * More and improved documentation.
10425 * std: `iterator` module for external iterator objects.
10426 * Many old-style (internal, higher-order function) iterators replaced by
10427 implementations of `Iterator`.
10428 * std: Many old internal vector and string iterators,
10429 incl. `any`, `all`. removed.
10430 * std: The `finalize` method of `Drop` renamed to `drop`.
10431 * std: The `drop` method now takes `&mut self` instead of `&self`.
10432 * std: The prelude no longer re-exports any modules, only types and traits.
10433 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10434 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10435 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10436 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10437 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10438 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10439 * std: Many types implement `Clone`.
10440 * std: `path` type renamed to `Path`.
10441 * std: `mut` module and `Mut` type removed.
10442 * std: Many standalone functions removed in favor of methods and iterators
10443 in `vec`, `str`. In the future methods will also work as functions.
10444 * std: `reinterpret_cast` removed. Use `transmute`.
10445 * std: ascii string handling in `std::ascii`.
10446 * std: `Rand` is implemented for ~/@.
10447 * std: `run` module for spawning processes overhauled.
10448 * std: Various atomic types added to `unstable::atomic`.
10449 * std: Various types implement `Zero`.
10450 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10451 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10452 * std: Added `os::mkdir_recursive`.
10453 * std: Added `os::glob` function performs filesystems globs.
10454 * std: `FuzzyEq` renamed to `ApproxEq`.
10455 * std: `Map` now defines `pop` and `swap` methods.
10456 * std: `Cell` constructors converted to static methods.
10457 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10458 * extra: `flate` module moved from `std` to `extra`.
10459 * extra: `fileinput` module for iterating over a series of files.
10460 * extra: `Complex` number type and `complex` module.
10461 * extra: `Rational` number type and `rational` module.
10462 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10463 * extra: `term` uses terminfo now, is more correct.
10464 * extra: `arc` functions converted to methods.
10465 * extra: Implementation of fixed output size variations of SHA-2.
10468 * `unused_variables` lint mode for unused variables (default: warn).
10469 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10471 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10473 * `dead_assignment` lint mode for unread variables (default: warn).
10474 * `unnecessary_allocation` lint mode detects some heap allocations that are
10475 immediately borrowed so could be written without allocating (default: warn).
10476 * `missing_doc` lint mode (default: allow).
10477 * `unreachable_code` lint mode (default: warn).
10478 * The `rusti` command has been rewritten and a number of bugs addressed.
10479 * rustc outputs in color on more terminals.
10480 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10481 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10482 * Compiling with `-g` will make the binary record information about
10483 dynamic borrowcheck failures for debugging.
10484 * rustdoc has a nicer stylesheet.
10485 * Various improvements to rustdoc.
10486 * Improvements to rustpkg (see the detailed release notes).
10489 Version 0.6 (2013-04-03)
10490 ========================
10492 * ~2100 changes, numerous bugfixes
10495 * The self type parameter in traits is now spelled `Self`
10496 * The `self` parameter in trait and impl methods must now be explicitly
10497 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10498 * Static methods no longer require the `static` keyword and instead
10499 are distinguished by the lack of a `self` parameter
10500 * Replaced the `Durable` trait with the `'static` lifetime
10501 * The old closure type syntax with the trailing sigil has been
10502 removed in favor of the more consistent leading sigil
10503 * `super` is a keyword, and may be prefixed to paths
10504 * Trait bounds are separated with `+` instead of whitespace
10505 * Traits are implemented with `impl Trait for Type`
10506 instead of `impl Type: Trait`
10507 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10508 * The `export` keyword has finally been removed
10509 * The `move` keyword has been removed (see "Semantic changes")
10510 * The interior mutability qualifier on vectors, `[mut T]`, has been
10511 removed. Use `&mut [T]`, etc.
10512 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10513 * `fail` is no longer a keyword. Use `fail!()`
10514 * `assert` is no longer a keyword. Use `assert!()`
10515 * `log` is no longer a keyword. use `debug!`, etc.
10516 * 1-tuples may be represented as `(T,)`
10517 * Struct fields may no longer be `mut`. Use inherited mutability,
10518 `@mut T`, `core::mut` or `core::cell`
10519 * `extern mod { ... }` is no longer valid syntax for foreign
10520 function modules. Use extern blocks: `extern { ... }`
10521 * Newtype enums removed. Use tuple-structs.
10522 * Trait implementations no longer support visibility modifiers
10523 * Pattern matching over vectors improved and expanded
10524 * `const` renamed to `static` to correspond to lifetime name,
10525 and make room for future `static mut` unsafe mutable globals.
10526 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10527 * `Clone` implementations can be automatically generated with
10528 `#[deriving(Clone)]`
10529 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10530 instead of `foo as Bar`.
10531 * Fixed length vector types are now written as `[int, .. 3]`
10532 instead of `[int * 3]`.
10533 * Fixed length vector types can express the length as a constant
10534 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10537 * Types with owned pointers or custom destructors move by default,
10538 eliminating the `move` keyword
10539 * All foreign functions are considered unsafe
10540 * &mut is now unaliasable
10541 * Writes to borrowed @mut pointers are prevented dynamically
10543 * The name of the main function can be customized using #[main]
10544 * The default type of an inferred closure is &fn instead of @fn
10545 * `use` statements may no longer be "chained" - they cannot import
10546 identifiers imported by previous `use` statements
10547 * `use` statements are crate relative, importing from the "top"
10548 of the crate by default. Paths may be prefixed with `super::`
10549 or `self::` to change the search behavior.
10550 * Method visibility is inherited from the implementation declaration
10551 * Structural records have been removed
10552 * Many more types can be used in static items, including enums
10553 'static-lifetime pointers and vectors
10554 * Pattern matching over vectors improved and expanded
10555 * Typechecking of closure types has been overhauled to
10556 improve inference and eliminate unsoundness
10557 * Macros leave scope at the end of modules, unless that module is
10558 tagged with #[macro_escape]
10561 * Added big integers to `std::bigint`
10562 * Removed `core::oldcomm` module
10563 * Added pipe-based `core::comm` module
10564 * Numeric traits have been reorganized under `core::num`
10565 * `vec::slice` finally returns a slice
10566 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10567 * Containers reorganized around traits in `core::container`
10568 * `core::dvec` removed, `~[T]` is a drop-in replacement
10569 * `core::send_map` renamed to `core::hashmap`
10570 * `std::map` removed; replaced with `core::hashmap`
10571 * `std::treemap` reimplemented as an owned balanced tree
10572 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10573 * `core::trie` added as a fast ordered map for integer keys
10574 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10575 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10576 overload the comparison operators, whereas `TotalOrd` is used
10577 by certain container types
10580 * Replaced the 'cargo' package manager with 'rustpkg'
10581 * Added all-purpose 'rust' tool
10582 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10583 * rustc now *attempts* to offer spelling suggestions
10584 * Improved support for ARM and Android
10585 * Preliminary MIPS backend
10586 * Improved foreign function ABI implementation for x86, x86_64
10587 * Various memory usage improvements
10588 * Rust code may be embedded in foreign code under limited circumstances
10589 * Inline assembler supported by new asm!() syntax extension.
10592 Version 0.5 (2012-12-21)
10593 ===========================
10595 * ~900 changes, numerous bugfixes
10598 * Removed `<-` move operator
10599 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10600 * Removed old fixed length vector syntax - `[T]/N`
10601 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10602 * Macros may now expand to items and statements
10603 * `a.b()` is always parsed as a method call, never as a field projection
10604 * `Eq` and `IterBytes` implementations can be automatically generated
10605 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10606 * Removed the special crate language for `.rc` files
10607 * Function arguments may consist of any irrefutable pattern
10610 * `&` and `~` pointers may point to objects
10611 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10612 * Enum variants may be structs
10613 * Destructors can be added to all nominal types with the Drop trait
10614 * Structs and nullary enum variants may be constants
10615 * Values that cannot be implicitly copied are now automatically moved
10616 without writing `move` explicitly
10617 * `&T` may now be coerced to `*T`
10618 * Coercions happen in `let` statements as well as function calls
10619 * `use` statements now take crate-relative paths
10620 * The module and type namespaces have been merged so that static
10621 method names can be resolved under the trait in which they are
10624 * Improved support for language features
10625 * Trait inheritance works in many scenarios
10626 * More support for explicit self arguments in methods - `self`, `&self`
10627 `@self`, and `~self` all generally work as expected
10628 * Static methods work in more situations
10629 * Experimental: Traits may declare default methods for the implementations
10633 * New condition handling system in `core::condition`
10634 * Timsort added to `std::sort`
10635 * New priority queue, `std::priority_queue`
10636 * Pipes for serializable types, `std::flatpipes'
10637 * Serialization overhauled to be trait-based
10638 * Expanded `getopts` definitions
10639 * Moved futures to `std`
10640 * More functions are pure now
10641 * `core::comm` renamed to `oldcomm`. Still deprecated
10642 * `rustdoc` and `cargo` are libraries now
10645 * Added a preliminary REPL, `rusti`
10646 * License changed from MIT to dual MIT/APL2
10649 Version 0.4 (2012-10-15)
10650 ==========================
10652 * ~2000 changes, numerous bugfixes
10655 * All keywords are now strict and may not be used as identifiers anywhere
10656 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10657 'of', 'with', 'to', 'class'.
10658 * Classes are replaced with simpler structs
10659 * Explicit method self types
10660 * `ret` became `return` and `alt` became `match`
10661 * `import` is now `use`; `use is now `extern mod`
10662 * `extern mod { ... }` is now `extern { ... }`
10663 * `use mod` is the recommended way to import modules
10664 * `pub` and `priv` replace deprecated export lists
10665 * The syntax of `match` pattern arms now uses fat arrow (=>)
10666 * `main` no longer accepts an args vector; use `os::args` instead
10669 * Trait implementations are now coherent, ala Haskell typeclasses
10670 * Trait methods may be static
10671 * Argument modes are deprecated
10672 * Borrowed pointers are much more mature and recommended for use
10673 * Strings and vectors in the static region are stored in constant memory
10674 * Typestate was removed
10675 * Resolution rewritten to be more reliable
10676 * Support for 'dual-mode' data structures (freezing and thawing)
10679 * Most binary operators can now be overloaded via the traits in
10681 * `std::net::url` for representing URLs
10682 * Sendable hash maps in `core::send_map`
10683 * `core::task' gained a (currently unsafe) task-local storage API
10686 * An efficient new intertask communication primitive called the pipe,
10687 along with a number of higher-level channel types, in `core::pipes`
10688 * `std::arc`, an atomically reference counted, immutable, shared memory
10690 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10691 * Futures are now based on pipes and sendable
10692 * More robust linked task failure
10693 * Improved task builder API
10696 * Improved error reporting
10697 * Preliminary JIT support
10698 * Preliminary work on precise GC
10699 * Extensive architectural improvements to rustc
10700 * Begun a transition away from buggy C++-based reflection (shape) code to
10701 Rust-based (visitor) code
10702 * All hash functions and tables converted to secure, randomized SipHash
10705 Version 0.3 (2012-07-12)
10706 ========================
10708 * ~1900 changes, numerous bugfixes
10710 * New coding conveniences
10711 * Integer-literal suffix inference
10712 * Per-item control over warnings, errors
10713 * #[cfg(windows)] and #[cfg(unix)] attributes
10714 * Documentation comments
10715 * More compact closure syntax
10716 * 'do' expressions for treating higher-order functions as
10718 * *-patterns (wildcard extended to all constructor fields)
10721 * Name resolution pass and exhaustiveness checker rewritten
10722 * Region pointers and borrow checking supersede alias
10724 * Init-ness checking is now provided by a region-based liveness
10725 pass instead of the typestate pass; same for last-use analysis
10726 * Extensive work on region pointers
10728 * Experimental new language features
10729 * Slices and fixed-size, interior-allocated vectors
10730 * #!-comments for lang versioning, shell execution
10731 * Destructors and iface implementation for classes;
10732 type-parameterized classes and class methods
10733 * 'const' type kind for types that can be used to implement
10734 shared-memory concurrency patterns
10738 * Removal of various obsolete features
10739 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10740 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10742 * Constructs: do-while loops ('do' repurposed), fn binding,
10743 resources (replaced by destructors)
10745 * Compiler reorganization
10746 * Syntax-layer of compiler split into separate crate
10747 * Clang (from LLVM project) integrated into build
10748 * Typechecker split into sub-modules
10751 * New time functions
10752 * Extension methods for many built-in types
10753 * Arc: atomic-refcount read-only / exclusive-use shared cells
10754 * Par: parallel map and search routines
10755 * Extensive work on libuv interface
10756 * Much vector code moved to libraries
10757 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10758 #include, #include_str, #include_bin
10760 * Tool improvements
10761 * Cargo automatically resolves dependencies
10764 Version 0.2 (2012-03-29)
10765 =========================
10767 * >1500 changes, numerous bugfixes
10769 * New docs and doc tooling
10771 * New port: FreeBSD x86_64
10773 * Compilation model enhancements
10774 * Generics now specialized, multiply instantiated
10775 * Functions now inlined across separate crates
10777 * Scheduling, stack and threading fixes
10778 * Noticeably improved message-passing performance
10779 * Explicit schedulers
10783 * Experimental new language features
10784 * Operator overloading
10788 * Various language extensions
10789 * C-callback function types: 'crust fn ...'
10790 * Infinite-loop construct: 'loop { ... }'
10791 * Shorten 'mutable' to 'mut'
10792 * Required mutable-local qualifier: 'let mut ...'
10793 * Basic glob-exporting: 'export foo::*;'
10794 * Alt now exhaustive, 'alt check' for runtime-checked
10795 * Block-function form of 'for' loop, with 'break' and 'ret'.
10798 * AST quasi-quote syntax extension
10799 * Revived libuv interface
10800 * New modules: core::{future, iter}, std::arena
10801 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10802 * Extensive cleanup, regularization in libstd, libcore
10805 Version 0.1 (2012-01-20)
10806 ===============================
10808 * Most language features work, including:
10809 * Unique pointers, unique closures, move semantics
10810 * Interface-constrained generics
10811 * Static interface dispatch
10813 * Multithread task scheduling
10814 * Typestate predicates
10815 * Failure unwinding, destructors
10816 * Pattern matching and destructuring assignment
10817 * Lightweight block-lambda syntax
10818 * Preliminary macro-by-example
10820 * Compiler works with the following configurations:
10821 * Linux: x86 and x86_64 hosts and targets
10822 * macOS: x86 and x86_64 hosts and targets
10823 * Windows: x86 hosts and targets
10825 * Cross compilation / multi-target configuration supported.
10827 * Preliminary API-documentation and package-management tools included.
10831 * Documentation is incomplete.
10833 * Performance is below intended target.
10835 * Standard library APIs are subject to extensive change, reorganization.
10837 * Language-level versioning is not yet operational - future code will
10838 break unexpectedly.